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-rw-r--r--Documentation/devicetree/bindings/iommu/nvidia,tegra20-gart.txt14
-rw-r--r--Documentation/kernel-parameters.txt6
-rw-r--r--MAINTAINERS6
-rw-r--r--block/Kconfig.iosched4
-rw-r--r--block/blk-cgroup.c2100
-rw-r--r--block/blk-cgroup.h647
-rw-r--r--block/blk-core.c281
-rw-r--r--block/blk-ioc.c126
-rw-r--r--block/blk-sysfs.c6
-rw-r--r--block/blk-throttle.c697
-rw-r--r--block/blk.h32
-rw-r--r--block/cfq-iosched.c1072
-rw-r--r--block/cfq.h115
-rw-r--r--block/deadline-iosched.c8
-rw-r--r--block/elevator.c121
-rw-r--r--block/noop-iosched.c8
-rw-r--r--drivers/block/drbd/drbd_actlog.c104
-rw-r--r--drivers/block/drbd/drbd_bitmap.c146
-rw-r--r--drivers/block/drbd/drbd_int.h90
-rw-r--r--drivers/block/drbd/drbd_main.c357
-rw-r--r--drivers/block/drbd/drbd_nl.c48
-rw-r--r--drivers/block/drbd/drbd_proc.c2
-rw-r--r--drivers/block/drbd/drbd_receiver.c95
-rw-r--r--drivers/block/drbd/drbd_req.c132
-rw-r--r--drivers/block/drbd/drbd_req.h19
-rw-r--r--drivers/block/drbd/drbd_worker.c31
-rw-r--r--drivers/block/floppy.c161
-rw-r--r--drivers/block/xen-blkfront.c44
-rw-r--r--drivers/gpu/drm/drm_crtc.c8
-rw-r--r--drivers/gpu/drm/drm_edid.c22
-rw-r--r--drivers/gpu/drm/i915/i915_debugfs.c2
-rw-r--r--drivers/gpu/drm/i915/i915_gem.c16
-rw-r--r--drivers/gpu/drm/i915/i915_irq.c37
-rw-r--r--drivers/gpu/drm/i915/intel_display.c56
-rw-r--r--drivers/gpu/drm/i915/intel_dp.c24
-rw-r--r--drivers/gpu/drm/i915/intel_i2c.c21
-rw-r--r--drivers/gpu/drm/i915/intel_lvds.c8
-rw-r--r--drivers/gpu/drm/i915/intel_pm.c64
-rw-r--r--drivers/gpu/drm/i915/intel_sdvo.c12
-rw-r--r--drivers/gpu/drm/i915/intel_sdvo_regs.h5
-rw-r--r--drivers/gpu/drm/i915/intel_tv.c53
-rw-r--r--drivers/gpu/drm/radeon/ni.c2
-rw-r--r--drivers/gpu/drm/radeon/radeon.h1
-rw-r--r--drivers/gpu/drm/radeon/radeon_atombios.c4
-rw-r--r--drivers/gpu/drm/radeon/radeon_cs.c27
-rw-r--r--drivers/gpu/drm/radeon/radeon_ring.c25
-rw-r--r--drivers/gpu/drm/udl/udl_gem.c4
-rw-r--r--drivers/iommu/amd_iommu.c37
-rw-r--r--drivers/iommu/iommu.c5
-rw-r--r--drivers/iommu/omap-iommu.c32
-rw-r--r--drivers/iommu/tegra-gart.c20
-rw-r--r--drivers/iommu/tegra-smmu.c2
-rw-r--r--drivers/remoteproc/remoteproc_core.c4
-rw-r--r--fs/bio.c61
-rw-r--r--fs/ioprio.c2
-rw-r--r--fs/splice.c4
-rw-r--r--include/linux/bio.h8
-rw-r--r--include/linux/blk_types.h10
-rw-r--r--include/linux/blkdev.h20
-rw-r--r--include/linux/drbd.h6
-rw-r--r--include/linux/drbd_limits.h7
-rw-r--r--include/linux/drbd_nl.h5
-rw-r--r--include/linux/elevator.h8
-rw-r--r--include/linux/iocontext.h39
-rw-r--r--include/linux/iommu.h10
-rw-r--r--include/linux/ioprio.h22
-rw-r--r--init/Kconfig2
-rw-r--r--kernel/fork.c5
-rw-r--r--lib/dma-debug.c10
-rw-r--r--mm/hugetlb.c3
70 files changed, 3664 insertions, 3521 deletions
diff --git a/Documentation/devicetree/bindings/iommu/nvidia,tegra20-gart.txt b/Documentation/devicetree/bindings/iommu/nvidia,tegra20-gart.txt
new file mode 100644
index 00000000000..099d9362ebc
--- /dev/null
+++ b/Documentation/devicetree/bindings/iommu/nvidia,tegra20-gart.txt
@@ -0,0 +1,14 @@
+NVIDIA Tegra 20 GART
+
+Required properties:
+- compatible: "nvidia,tegra20-gart"
+- reg: Two pairs of cells specifying the physical address and size of
+ the memory controller registers and the GART aperture respectively.
+
+Example:
+
+ gart {
+ compatible = "nvidia,tegra20-gart";
+ reg = <0x7000f024 0x00000018 /* controller registers */
+ 0x58000000 0x02000000>; /* GART aperture */
+ };
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index b40b413db88..c45513d806a 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -335,6 +335,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
requirements as needed. This option
does not override iommu=pt
+ amd_iommu_dump= [HW,X86-64]
+ Enable AMD IOMMU driver option to dump the ACPI table
+ for AMD IOMMU. With this option enabled, AMD IOMMU
+ driver will print ACPI tables for AMD IOMMU during
+ IOMMU initialization.
+
amijoy.map= [HW,JOY] Amiga joystick support
Map of devices attached to JOY0DAT and JOY1DAT
Format: <a>,<b>
diff --git a/MAINTAINERS b/MAINTAINERS
index a246490c95e..64e675d6d47 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2818,6 +2818,12 @@ F: Documentation/firmware_class/
F: drivers/base/firmware*.c
F: include/linux/firmware.h
+FLOPPY DRIVER
+M: Jiri Kosina <jkosina@suse.cz>
+T: git git://git.kernel.org/pub/scm/linux/kernel/git/jikos/floppy.git
+S: Odd fixes
+F: drivers/block/floppy.c
+
FPU EMULATOR
M: Bill Metzenthen <billm@melbpc.org.au>
W: http://floatingpoint.sourceforge.net/emulator/index.html
diff --git a/block/Kconfig.iosched b/block/Kconfig.iosched
index 3199b76f795..421bef9c4c4 100644
--- a/block/Kconfig.iosched
+++ b/block/Kconfig.iosched
@@ -23,8 +23,6 @@ config IOSCHED_DEADLINE
config IOSCHED_CFQ
tristate "CFQ I/O scheduler"
- # If BLK_CGROUP is a module, CFQ has to be built as module.
- depends on (BLK_CGROUP=m && m) || !BLK_CGROUP || BLK_CGROUP=y
default y
---help---
The CFQ I/O scheduler tries to distribute bandwidth equally
@@ -34,8 +32,6 @@ config IOSCHED_CFQ
This is the default I/O scheduler.
- Note: If BLK_CGROUP=m, then CFQ can be built only as module.
-
config CFQ_GROUP_IOSCHED
bool "CFQ Group Scheduling support"
depends on IOSCHED_CFQ && BLK_CGROUP
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 126c341955d..02cf6335e9b 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -11,1570 +11,612 @@
* Nauman Rafique <nauman@google.com>
*/
#include <linux/ioprio.h>
-#include <linux/seq_file.h>
#include <linux/kdev_t.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/blkdev.h>
#include <linux/slab.h>
-#include "blk-cgroup.h"
#include <linux/genhd.h>
+#include <linux/delay.h>
+#include <linux/atomic.h>
+#include "blk-cgroup.h"
+#include "blk.h"
#define MAX_KEY_LEN 100
-static DEFINE_SPINLOCK(blkio_list_lock);
-static LIST_HEAD(blkio_list);
+static DEFINE_MUTEX(blkcg_pol_mutex);
-struct blkio_cgroup blkio_root_cgroup = { .weight = 2*BLKIO_WEIGHT_DEFAULT };
-EXPORT_SYMBOL_GPL(blkio_root_cgroup);
+struct blkcg blkcg_root = { .cfq_weight = 2 * CFQ_WEIGHT_DEFAULT };
+EXPORT_SYMBOL_GPL(blkcg_root);
-/* for encoding cft->private value on file */
-#define BLKIOFILE_PRIVATE(x, val) (((x) << 16) | (val))
-/* What policy owns the file, proportional or throttle */
-#define BLKIOFILE_POLICY(val) (((val) >> 16) & 0xffff)
-#define BLKIOFILE_ATTR(val) ((val) & 0xffff)
+static struct blkcg_policy *blkcg_policy[BLKCG_MAX_POLS];
-static inline void blkio_policy_insert_node(struct blkio_cgroup *blkcg,
- struct blkio_policy_node *pn)
+struct blkcg *cgroup_to_blkcg(struct cgroup *cgroup)
{
- list_add(&pn->node, &blkcg->policy_list);
+ return container_of(cgroup_subsys_state(cgroup, blkio_subsys_id),
+ struct blkcg, css);
}
+EXPORT_SYMBOL_GPL(cgroup_to_blkcg);
-static inline bool cftype_blkg_same_policy(struct cftype *cft,
- struct blkio_group *blkg)
+static struct blkcg *task_blkcg(struct task_struct *tsk)
{
- enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private);
-
- if (blkg->plid == plid)
- return 1;
-
- return 0;
+ return container_of(task_subsys_state(tsk, blkio_subsys_id),
+ struct blkcg, css);
}
-/* Determines if policy node matches cgroup file being accessed */
-static inline bool pn_matches_cftype(struct cftype *cft,
- struct blkio_policy_node *pn)
+struct blkcg *bio_blkcg(struct bio *bio)
{
- enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private);
- int fileid = BLKIOFILE_ATTR(cft->private);
-
- return (plid == pn->plid && fileid == pn->fileid);
+ if (bio && bio->bi_css)
+ return container_of(bio->bi_css, struct blkcg, css);
+ return task_blkcg(current);
}
+EXPORT_SYMBOL_GPL(bio_blkcg);
-/* Must be called with blkcg->lock held */
-static inline void blkio_policy_delete_node(struct blkio_policy_node *pn)
+static bool blkcg_policy_enabled(struct request_queue *q,
+ const struct blkcg_policy *pol)
{
- list_del(&pn->node);
+ return pol && test_bit(pol->plid, q->blkcg_pols);
}
-/* Must be called with blkcg->lock held */
-static struct blkio_policy_node *
-blkio_policy_search_node(const struct blkio_cgroup *blkcg, dev_t dev,
- enum blkio_policy_id plid, int fileid)
+/**
+ * blkg_free - free a blkg
+ * @blkg: blkg to free
+ *
+ * Free @blkg which may be partially allocated.
+ */
+static void blkg_free(struct blkcg_gq *blkg)
{
- struct blkio_policy_node *pn;
-
- list_for_each_entry(pn, &blkcg->policy_list, node) {
- if (pn->dev == dev && pn->plid == plid && pn->fileid == fileid)
- return pn;
- }
+ int i;
- return NULL;
-}
+ if (!blkg)
+ return;
-struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup)
-{
- return container_of(cgroup_subsys_state(cgroup, blkio_subsys_id),
- struct blkio_cgroup, css);
-}
-EXPORT_SYMBOL_GPL(cgroup_to_blkio_cgroup);
+ for (i = 0; i < BLKCG_MAX_POLS; i++) {
+ struct blkcg_policy *pol = blkcg_policy[i];
+ struct blkg_policy_data *pd = blkg->pd[i];
-struct blkio_cgroup *task_blkio_cgroup(struct task_struct *tsk)
-{
- return container_of(task_subsys_state(tsk, blkio_subsys_id),
- struct blkio_cgroup, css);
-}
-EXPORT_SYMBOL_GPL(task_blkio_cgroup);
+ if (!pd)
+ continue;
-static inline void
-blkio_update_group_weight(struct blkio_group *blkg, unsigned int weight)
-{
- struct blkio_policy_type *blkiop;
+ if (pol && pol->pd_exit_fn)
+ pol->pd_exit_fn(blkg);
- list_for_each_entry(blkiop, &blkio_list, list) {
- /* If this policy does not own the blkg, do not send updates */
- if (blkiop->plid != blkg->plid)
- continue;
- if (blkiop->ops.blkio_update_group_weight_fn)
- blkiop->ops.blkio_update_group_weight_fn(blkg->key,
- blkg, weight);
+ kfree(pd);
}
+
+ kfree(blkg);
}
-static inline void blkio_update_group_bps(struct blkio_group *blkg, u64 bps,
- int fileid)
+/**
+ * blkg_alloc - allocate a blkg
+ * @blkcg: block cgroup the new blkg is associated with
+ * @q: request_queue the new blkg is associated with
+ *
+ * Allocate a new blkg assocating @blkcg and @q.
+ */
+static struct blkcg_gq *blkg_alloc(struct blkcg *blkcg, struct request_queue *q)
{
- struct blkio_policy_type *blkiop;
-
- list_for_each_entry(blkiop, &blkio_list, list) {
-
- /* If this policy does not own the blkg, do not send updates */
- if (blkiop->plid != blkg->plid)
- continue;
-
- if (fileid == BLKIO_THROTL_read_bps_device
- && blkiop->ops.blkio_update_group_read_bps_fn)
- blkiop->ops.blkio_update_group_read_bps_fn(blkg->key,
- blkg, bps);
+ struct blkcg_gq *blkg;
+ int i;
- if (fileid == BLKIO_THROTL_write_bps_device
- && blkiop->ops.blkio_update_group_write_bps_fn)
- blkiop->ops.blkio_update_group_write_bps_fn(blkg->key,
- blkg, bps);
- }
-}
+ /* alloc and init base part */
+ blkg = kzalloc_node(sizeof(*blkg), GFP_ATOMIC, q->node);
+ if (!blkg)
+ return NULL;
-static inline void blkio_update_group_iops(struct blkio_group *blkg,
- unsigned int iops, int fileid)
-{
- struct blkio_policy_type *blkiop;
+ blkg->q = q;
+ INIT_LIST_HEAD(&blkg->q_node);
+ blkg->blkcg = blkcg;
+ blkg->refcnt = 1;
- list_for_each_entry(blkiop, &blkio_list, list) {
+ for (i = 0; i < BLKCG_MAX_POLS; i++) {
+ struct blkcg_policy *pol = blkcg_policy[i];
+ struct blkg_policy_data *pd;
- /* If this policy does not own the blkg, do not send updates */
- if (blkiop->plid != blkg->plid)
+ if (!blkcg_policy_enabled(q, pol))
continue;
- if (fileid == BLKIO_THROTL_read_iops_device
- && blkiop->ops.blkio_update_group_read_iops_fn)
- blkiop->ops.blkio_update_group_read_iops_fn(blkg->key,
- blkg, iops);
+ /* alloc per-policy data and attach it to blkg */
+ pd = kzalloc_node(pol->pd_size, GFP_ATOMIC, q->node);
+ if (!pd) {
+ blkg_free(blkg);
+ return NULL;
+ }
- if (fileid == BLKIO_THROTL_write_iops_device
- && blkiop->ops.blkio_update_group_write_iops_fn)
- blkiop->ops.blkio_update_group_write_iops_fn(blkg->key,
- blkg,iops);
+ blkg->pd[i] = pd;
+ pd->blkg = blkg;
}
-}
-/*
- * Add to the appropriate stat variable depending on the request type.
- * This should be called with the blkg->stats_lock held.
- */
-static void blkio_add_stat(uint64_t *stat, uint64_t add, bool direction,
- bool sync)
-{
- if (direction)
- stat[BLKIO_STAT_WRITE] += add;
- else
- stat[BLKIO_STAT_READ] += add;
- if (sync)
- stat[BLKIO_STAT_SYNC] += add;
- else
- stat[BLKIO_STAT_ASYNC] += add;
-}
+ /* invoke per-policy init */
+ for (i = 0; i < BLKCG_MAX_POLS; i++) {
+ struct blkcg_policy *pol = blkcg_policy[i];
-/*
- * Decrements the appropriate stat variable if non-zero depending on the
- * request type. Panics on value being zero.
- * This should be called with the blkg->stats_lock held.
- */
-static void blkio_check_and_dec_stat(uint64_t *stat, bool direction, bool sync)
-{
- if (direction) {
- BUG_ON(stat[BLKIO_STAT_WRITE] == 0);
- stat[BLKIO_STAT_WRITE]--;
- } else {
- BUG_ON(stat[BLKIO_STAT_READ] == 0);
- stat[BLKIO_STAT_READ]--;
- }
- if (sync) {
- BUG_ON(stat[BLKIO_STAT_SYNC] == 0);
- stat[BLKIO_STAT_SYNC]--;
- } else {
- BUG_ON(stat[BLKIO_STAT_ASYNC] == 0);
- stat[BLKIO_STAT_ASYNC]--;
+ if (blkcg_policy_enabled(blkg->q, pol))
+ pol->pd_init_fn(blkg);
}
-}
-#ifdef CONFIG_DEBUG_BLK_CGROUP
-/* This should be called with the blkg->stats_lock held. */
-static void blkio_set_start_group_wait_time(struct blkio_group *blkg,
- struct blkio_group *curr_blkg)
-{
- if (blkio_blkg_waiting(&blkg->stats))
- return;
- if (blkg == curr_blkg)
- return;
- blkg->stats.start_group_wait_time = sched_clock();
- blkio_mark_blkg_waiting(&blkg->stats);
+ return blkg;
}
-/* This should be called with the blkg->stats_lock held. */
-static void blkio_update_group_wait_time(struct blkio_group_stats *stats)
+static struct blkcg_gq *__blkg_lookup(struct blkcg *blkcg,
+ struct request_queue *q)
{
- unsigned long long now;
+ struct blkcg_gq *blkg;
- if (!blkio_blkg_waiting(stats))
- return;
+ blkg = rcu_dereference(blkcg->blkg_hint);
+ if (blkg && blkg->q == q)
+ return blkg;
- now = sched_clock();
- if (time_after64(now, stats->start_group_wait_time))
- stats->group_wait_time += now - stats->start_group_wait_time;
- blkio_clear_blkg_waiting(stats);
+ /*
+ * Hint didn't match. Look up from the radix tree. Note that we
+ * may not be holding queue_lock and thus are not sure whether
+ * @blkg from blkg_tree has already been removed or not, so we
+ * can't update hint to the lookup result. Leave it to the caller.
+ */
+ blkg = radix_tree_lookup(&blkcg->blkg_tree, q->id);
+ if (blkg && blkg->q == q)
+ return blkg;
+
+ return NULL;
}
-/* This should be called with the blkg->stats_lock held. */
-static void blkio_end_empty_time(struct blkio_group_stats *stats)
+/**
+ * blkg_lookup - lookup blkg for the specified blkcg - q pair
+ * @blkcg: blkcg of interest
+ * @q: request_queue of interest
+ *
+ * Lookup blkg for the @blkcg - @q pair. This function should be called
+ * under RCU read lock and is guaranteed to return %NULL if @q is bypassing
+ * - see blk_queue_bypass_start() for details.
+ */
+struct blkcg_gq *blkg_lookup(struct blkcg *blkcg, struct request_queue *q)
{
- unsigned long long now;
-
- if (!blkio_blkg_empty(stats))
- return;
+ WARN_ON_ONCE(!rcu_read_lock_held());
- now = sched_clock();
- if (time_after64(now, stats->start_empty_time))
- stats->empty_time += now - stats->start_empty_time;
- blkio_clear_blkg_empty(stats);
+ if (unlikely(blk_queue_bypass(q)))
+ return NULL;
+ return __blkg_lookup(blkcg, q);
}
+EXPORT_SYMBOL_GPL(blkg_lookup);
-void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg)
+static struct blkcg_gq *__blkg_lookup_create(struct blkcg *blkcg,
+ struct request_queue *q)
+ __releases(q->queue_lock) __acquires(q->queue_lock)
{
- unsigned long flags;
+ struct blkcg_gq *blkg;
+ int ret;
- spin_lock_irqsave(&blkg->stats_lock, flags);
- BUG_ON(blkio_blkg_idling(&blkg->stats));
- blkg->stats.start_idle_time = sched_clock();
- blkio_mark_blkg_idling(&blkg->stats);
- spin_unlock_irqrestore(&blkg->stats_lock, flags);
-}
-EXPORT_SYMBOL_GPL(blkiocg_update_set_idle_time_stats);
+ WARN_ON_ONCE(!rcu_read_lock_held());
+ lockdep_assert_held(q->queue_lock);
-void blkiocg_update_idle_time_stats(struct blkio_group *blkg)
-{
- unsigned long flags;
- unsigned long long now;
- struct blkio_group_stats *stats;
-
- spin_lock_irqsave(&blkg->stats_lock, flags);
- stats = &blkg->stats;
- if (blkio_blkg_idling(stats)) {
- now = sched_clock();
- if (time_after64(now, stats->start_idle_time))
- stats->idle_time += now - stats->start_idle_time;
- blkio_clear_blkg_idling(stats);
+ /* lookup and update hint on success, see __blkg_lookup() for details */
+ blkg = __blkg_lookup(blkcg, q);
+ if (blkg) {
+ rcu_assign_pointer(blkcg->blkg_hint, blkg);
+ return blkg;
}
- spin_unlock_irqrestore(&blkg->stats_lock, flags);
-}
-EXPORT_SYMBOL_GPL(blkiocg_update_idle_time_stats);
-void blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg)
-{
- unsigned long flags;
- struct blkio_group_stats *stats;
-
- spin_lock_irqsave(&blkg->stats_lock, flags);
- stats = &blkg->stats;
- stats->avg_queue_size_sum +=
- stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_READ] +
- stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_WRITE];
- stats->avg_queue_size_samples++;
- blkio_update_group_wait_time(stats);
- spin_unlock_irqrestore(&blkg->stats_lock, flags);
-}
-EXPORT_SYMBOL_GPL(blkiocg_update_avg_queue_size_stats);
+ /* blkg holds a reference to blkcg */
+ if (!css_tryget(&blkcg->css))
+ return ERR_PTR(-EINVAL);
-void blkiocg_set_start_empty_time(struct blkio_group *blkg)
-{
- unsigned long flags;
- struct blkio_group_stats *stats;
+ /* allocate */
+ ret = -ENOMEM;
+ blkg = blkg_alloc(blkcg, q);
+ if (unlikely(!blkg))
+ goto err_put;
- spin_lock_irqsave(&blkg->stats_lock, flags);
- stats = &blkg->stats;
+ /* insert */
+ ret = radix_tree_preload(GFP_ATOMIC);
+ if (ret)
+ goto err_free;
- if (stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_READ] ||
- stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_WRITE]) {
- spin_unlock_irqrestore(&blkg->stats_lock, flags);
- return;
+ spin_lock(&blkcg->lock);
+ ret = radix_tree_insert(&blkcg->blkg_tree, q->id, blkg);
+ if (likely(!ret)) {
+ hlist_add_head_rcu(&blkg->blkcg_node, &blkcg->blkg_list);
+ list_add(&blkg->q_node, &q->blkg_list);
}
+ spin_unlock(&blkcg->lock);
- /*
- * group is already marked empty. This can happen if cfqq got new
- * request in parent group and moved to this group while being added
- * to service tree. Just ignore the event and move on.
- */
- if(blkio_blkg_empty(stats)) {
- spin_unlock_irqrestore(&blkg->stats_lock, flags);
- return;
- }
+ radix_tree_preload_end();
- stats->start_empty_time = sched_clock();
- blkio_mark_blkg_empty(stats);
- spin_unlock_irqrestore(&blkg->stats_lock, flags);
+ if (!ret)
+ return blkg;
+err_free:
+ blkg_free(blkg);
+err_put:
+ css_put(&blkcg->css);
+ return ERR_PTR(ret);
}
-EXPORT_SYMBOL_GPL(blkiocg_set_start_empty_time);
-void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
- unsigned long dequeue)
+struct blkcg_gq *blkg_lookup_create(struct blkcg *blkcg,
+ struct request_queue *q)
{
- blkg->stats.dequeue += dequeue;
-}
-EXPORT_SYMBOL_GPL(blkiocg_update_dequeue_stats);
-#else
-static inline void blkio_set_start_group_wait_time(struct blkio_group *blkg,
- struct blkio_group *curr_blkg) {}
-static inline void blkio_end_empty_time(struct blkio_group_stats *stats) {}
-#endif
-
-void blkiocg_update_io_add_stats(struct blkio_group *blkg,
- struct blkio_group *curr_blkg, bool direction,
- bool sync)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&blkg->stats_lock, flags);
- blkio_add_stat(blkg->stats.stat_arr[BLKIO_STAT_QUEUED], 1, direction,
- sync);
- blkio_end_empty_time(&blkg->stats);
- blkio_set_start_group_wait_time(blkg, curr_blkg);
- spin_unlock_irqrestore(&blkg->stats_lock, flags);
+ /*
+ * This could be the first entry point of blkcg implementation and
+ * we shouldn't allow anything to go through for a bypassing queue.
+ */
+ if (unlikely(blk_queue_bypass(q)))
+ return ERR_PTR(blk_queue_dead(q) ? -EINVAL : -EBUSY);
+ return __blkg_lookup_create(blkcg, q);
}
-EXPORT_SYMBOL_GPL(blkiocg_update_io_add_stats);
+EXPORT_SYMBOL_GPL(blkg_lookup_create);
-void blkiocg_update_io_remove_stats(struct blkio_group *blkg,
- bool direction, bool sync)
+static void blkg_destroy(struct blkcg_gq *blkg)
{
- unsigned long flags;
+ struct request_queue *q = blkg->q;
+ struct blkcg *blkcg = blkg->blkcg;
- spin_lock_irqsave(&blkg->stats_lock, flags);
- blkio_check_and_dec_stat(blkg->stats.stat_arr[BLKIO_STAT_QUEUED],
- direction, sync);
- spin_unlock_irqrestore(&blkg->stats_lock, flags);
-}
-EXPORT_SYMBOL_GPL(blkiocg_update_io_remove_stats);
+ lockdep_assert_held(q->queue_lock);
+ lockdep_assert_held(&blkcg->lock);
-void blkiocg_update_timeslice_used(struct blkio_group *blkg, unsigned long time,
- unsigned long unaccounted_time)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&blkg->stats_lock, flags);
- blkg->stats.time += time;
-#ifdef CONFIG_DEBUG_BLK_CGROUP
- blkg->stats.unaccounted_time += unaccounted_time;
-#endif
- spin_unlock_irqrestore(&blkg->stats_lock, flags);
-}
-EXPORT_SYMBOL_GPL(blkiocg_update_timeslice_used);
+ /* Something wrong if we are trying to remove same group twice */
+ WARN_ON_ONCE(list_empty(&blkg->q_node));
+ WARN_ON_ONCE(hlist_unhashed(&blkg->blkcg_node));
-/*
- * should be called under rcu read lock or queue lock to make sure blkg pointer
- * is valid.
- */
-void blkiocg_update_dispatch_stats(struct blkio_group *blkg,
- uint64_t bytes, bool direction, bool sync)
-{
- struct blkio_group_stats_cpu *stats_cpu;
- unsigned long flags;
+ radix_tree_delete(&blkcg->blkg_tree, blkg->q->id);
+ list_del_init(&blkg->q_node);
+ hlist_del_init_rcu(&blkg->blkcg_node);
/*
- * Disabling interrupts to provide mutual exclusion between two
- * writes on same cpu. It probably is not needed for 64bit. Not
- * optimizing that case yet.
+ * Both setting lookup hint to and clearing it from @blkg are done
+ * under queue_lock. If it's not pointing to @blkg now, it never
+ * will. Hint assignment itself can race safely.
*/
- local_irq_save(flags);
-
- stats_cpu = this_cpu_ptr(blkg->stats_cpu);
-
- u64_stats_update_begin(&stats_cpu->syncp);
- stats_cpu->sectors += bytes >> 9;
- blkio_add_stat(stats_cpu->stat_arr_cpu[BLKIO_STAT_CPU_SERVICED],
- 1, direction, sync);
- blkio_add_stat(stats_cpu->stat_arr_cpu[BLKIO_STAT_CPU_SERVICE_BYTES],
- bytes, direction, sync);
- u64_stats_update_end(&stats_cpu->syncp);
- local_irq_restore(flags);
-}
-EXPORT_SYMBOL_GPL(blkiocg_update_dispatch_stats);
-
-void blkiocg_update_completion_stats(struct blkio_group *blkg,
- uint64_t start_time, uint64_t io_start_time, bool direction, bool sync)
-{
- struct blkio_group_stats *stats;
- unsigned long flags;
- unsigned long long now = sched_clock();
-
- spin_lock_irqsave(&blkg->stats_lock, flags);
- stats = &blkg->stats;
- if (time_after64(now, io_start_time))
- blkio_add_stat(stats->stat_arr[BLKIO_STAT_SERVICE_TIME],
- now - io_start_time, direction, sync);
- if (time_after64(io_start_time, start_time))
- blkio_add_stat(stats->stat_arr[BLKIO_STAT_WAIT_TIME],
- io_start_time - start_time, direction, sync);
- spin_unlock_irqrestore(&blkg->stats_lock, flags);
-}
-EXPORT_SYMBOL_GPL(blkiocg_update_completion_stats);
-
-/* Merged stats are per cpu. */
-void blkiocg_update_io_merged_stats(struct blkio_group *blkg, bool direction,
- bool sync)
-{
- struct blkio_group_stats_cpu *stats_cpu;
- unsigned long flags;
+ if (rcu_dereference_raw(blkcg->blkg_hint) == blkg)
+ rcu_assign_pointer(blkcg->blkg_hint, NULL);
/*
- * Disabling interrupts to provide mutual exclusion between two
- * writes on same cpu. It probably is not needed for 64bit. Not
- * optimizing that case yet.
+ * Put the reference taken at the time of creation so that when all
+ * queues are gone, group can be destroyed.
*/
- local_irq_save(flags);
-
- stats_cpu = this_cpu_ptr(blkg->stats_cpu);
-
- u64_stats_update_begin(&stats_cpu->syncp);
- blkio_add_stat(stats_cpu->stat_arr_cpu[BLKIO_STAT_CPU_MERGED], 1,
- direction, sync);
- u64_stats_update_end(&stats_cpu->syncp);
- local_irq_restore(flags);
+ blkg_put(blkg);
}
-EXPORT_SYMBOL_GPL(blkiocg_update_io_merged_stats);
-/*
- * This function allocates the per cpu stats for blkio_group. Should be called
- * from sleepable context as alloc_per_cpu() requires that.
+/**
+ * blkg_destroy_all - destroy all blkgs associated with a request_queue
+ * @q: request_queue of interest
+ *
+ * Destroy all blkgs associated with @q.
*/
-int blkio_alloc_blkg_stats(struct blkio_group *blkg)
+static void blkg_destroy_all(struct request_queue *q)
{
- /* Allocate memory for per cpu stats */
- blkg->stats_cpu = alloc_percpu(struct blkio_group_stats_cpu);
- if (!blkg->stats_cpu)
- return -ENOMEM;
- return 0;
-}
-EXPORT_SYMBOL_GPL(blkio_alloc_blkg_stats);
+ struct blkcg_gq *blkg, *n;
-void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
- struct blkio_group *blkg, void *key, dev_t dev,
- enum blkio_policy_id plid)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&blkcg->lock, flags);
- spin_lock_init(&blkg->stats_lock);
- rcu_assign_pointer(blkg->key, key);
- blkg->blkcg_id = css_id(&blkcg->css);
- hlist_add_head_rcu(&blkg->blkcg_node, &blkcg->blkg_list);
- blkg->plid = plid;
- spin_unlock_irqrestore(&blkcg->lock, flags);
- /* Need to take css reference ? */
- cgroup_path(blkcg->css.cgroup, blkg->path, sizeof(blkg->path));
- blkg->dev = dev;
-}
-EXPORT_SYMBOL_GPL(blkiocg_add_blkio_group);
+ lockdep_assert_held(q->queue_lock);
-static void __blkiocg_del_blkio_group(struct blkio_group *blkg)
-{
- hlist_del_init_rcu(&blkg->blkcg_node);
- blkg->blkcg_id = 0;
-}
+ list_for_each_entry_safe(blkg, n, &q->blkg_list, q_node) {
+ struct blkcg *blkcg = blkg->blkcg;
-/*
- * returns 0 if blkio_group was still on cgroup list. Otherwise returns 1
- * indicating that blk_group was unhashed by the time we got to it.
- */
-int blkiocg_del_blkio_group(struct blkio_group *blkg)
-{
- struct blkio_cgroup *blkcg;
- unsigned long flags;
- struct cgroup_subsys_state *css;
- int ret = 1;
-
- rcu_read_lock();
- css = css_lookup(&blkio_subsys, blkg->blkcg_id);
- if (css) {
- blkcg = container_of(css, struct blkio_cgroup, css);
- spin_lock_irqsave(&blkcg->lock, flags);
- if (!hlist_unhashed(&blkg->blkcg_node)) {
- __blkiocg_del_blkio_group(blkg);
- ret = 0;
- }
- spin_unlock_irqrestore(&blkcg->lock, flags);
+ spin_lock(&blkcg->lock);
+ blkg_destroy(blkg);
+ spin_unlock(&blkcg->lock);
}
-
- rcu_read_unlock();
- return ret;
}
-EXPORT_SYMBOL_GPL(blkiocg_del_blkio_group);
-/* called under rcu_read_lock(). */
-struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg, void *key)
+static void blkg_rcu_free(struct rcu_head *rcu_head)
{
- struct blkio_group *blkg;
- struct hlist_node *n;
- void *__key;
-
- hlist_for_each_entry_rcu(blkg, n, &blkcg->blkg_list, blkcg_node) {
- __key = blkg->key;
- if (__key == key)
- return blkg;
- }
-
- return NULL;
+ blkg_free(container_of(rcu_head, struct blkcg_gq, rcu_head));
}
-EXPORT_SYMBOL_GPL(blkiocg_lookup_group);
-static void blkio_reset_stats_cpu(struct blkio_group *blkg)
+void __blkg_release(struct blkcg_gq *blkg)
{
- struct blkio_group_stats_cpu *stats_cpu;
- int i, j, k;
+ /* release the extra blkcg reference this blkg has been holding */
+ css_put(&blkg->blkcg->css);
+
/*
- * Note: On 64 bit arch this should not be an issue. This has the
- * possibility of returning some inconsistent value on 32bit arch
- * as 64bit update on 32bit is non atomic. Taking care of this
- * corner case makes code very complicated, like sending IPIs to
- * cpus, taking care of stats of offline cpus etc.
+ * A group is freed in rcu manner. But having an rcu lock does not
+ * mean that one can access all the fields of blkg and assume these
+ * are valid. For example, don't try to follow throtl_data and
+ * request queue links.
*
- * reset stats is anyway more of a debug feature and this sounds a
- * corner case. So I am not complicating the code yet until and
- * unless this becomes a real issue.
+ * Having a reference to blkg under an rcu allows acess to only
+ * values local to groups like group stats and group rate limits
*/
- for_each_possible_cpu(i) {
- stats_cpu = per_cpu_ptr(blkg->stats_cpu, i);
- stats_cpu->sectors = 0;
- for(j = 0; j < BLKIO_STAT_CPU_NR; j++)
- for (k = 0; k < BLKIO_STAT_TOTAL; k++)
- stats_cpu->stat_arr_cpu[j][k] = 0;
- }
+ call_rcu(&blkg->rcu_head, blkg_rcu_free);
}
+EXPORT_SYMBOL_GPL(__blkg_release);
-static int
-blkiocg_reset_stats(struct cgroup *cgroup, struct cftype *cftype, u64 val)
+static int blkcg_reset_stats(struct cgroup *cgroup, struct cftype *cftype,
+ u64 val)
{
- struct blkio_cgroup *blkcg;
- struct blkio_group *blkg;
- struct blkio_group_stats *stats;
+ struct blkcg *blkcg = cgroup_to_blkcg(cgroup);
+ struct blkcg_gq *blkg;
struct hlist_node *n;
- uint64_t queued[BLKIO_STAT_TOTAL];
int i;
-#ifdef CONFIG_DEBUG_BLK_CGROUP
- bool idling, waiting, empty;
- unsigned long long now = sched_clock();
-#endif
- blkcg = cgroup_to_blkio_cgroup(cgroup);
+ mutex_lock(&blkcg_pol_mutex);
spin_lock_irq(&blkcg->lock);
- hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) {
- spin_lock(&blkg->stats_lock);
- stats = &blkg->stats;
-#ifdef CONFIG_DEBUG_BLK_CGROUP
- idling = blkio_blkg_idling(stats);
- waiting = blkio_blkg_waiting(stats);
- empty = blkio_blkg_empty(stats);
-#endif
- for (i = 0; i < BLKIO_STAT_TOTAL; i++)
- queued[i] = stats->stat_arr[BLKIO_STAT_QUEUED][i];
- memset(stats, 0, sizeof(struct blkio_group_stats));
- for (i = 0; i < BLKIO_STAT_TOTAL; i++)
- stats->stat_arr[BLKIO_STAT_QUEUED][i] = queued[i];
-#ifdef CONFIG_DEBUG_BLK_CGROUP
- if (idling) {
- blkio_mark_blkg_idling(stats);
- stats->start_idle_time = now;
- }
- if (waiting) {
- blkio_mark_blkg_waiting(stats);
- stats->start_group_wait_time = now;
- }
- if (empty) {
- blkio_mark_blkg_empty(stats);
- stats->start_empty_time = now;
- }
-#endif
- spin_unlock(&blkg->stats_lock);
-
- /* Reset Per cpu stats which don't take blkg->stats_lock */
- blkio_reset_stats_cpu(blkg);
- }
-
- spin_unlock_irq(&blkcg->lock);
- return 0;
-}
-
-static void blkio_get_key_name(enum stat_sub_type type, dev_t dev, char *str,
- int chars_left, bool diskname_only)
-{
- snprintf(str, chars_left, "%d:%d", MAJOR(dev), MINOR(dev));
- chars_left -= strlen(str);
- if (chars_left <= 0) {
- printk(KERN_WARNING
- "Possibly incorrect cgroup stat display format");
- return;
- }
- if (diskname_only)
- return;
- switch (type) {
- case BLKIO_STAT_READ:
- strlcat(str, " Read", chars_left);
- break;
- case BLKIO_STAT_WRITE:
- strlcat(str, " Write", chars_left);
- break;
- case BLKIO_STAT_SYNC:
- strlcat(str, " Sync", chars_left);
- break;
- case BLKIO_STAT_ASYNC:
- strlcat(str, " Async", chars_left);
- break;
- case BLKIO_STAT_TOTAL:
- strlcat(str, " Total", chars_left);
- break;
- default:
- strlcat(str, " Invalid", chars_left);
- }
-}
-
-static uint64_t blkio_fill_stat(char *str, int chars_left, uint64_t val,
- struct cgroup_map_cb *cb, dev_t dev)
-{
- blkio_get_key_name(0, dev, str, chars_left, true);
- cb->fill(cb, str, val);
- return val;
-}
-
-
-static uint64_t blkio_read_stat_cpu(struct blkio_group *blkg,
- enum stat_type_cpu type, enum stat_sub_type sub_type)
-{
- int cpu;
- struct blkio_group_stats_cpu *stats_cpu;
- u64 val = 0, tval;
-
- for_each_possible_cpu(cpu) {
- unsigned int start;
- stats_cpu = per_cpu_ptr(blkg->stats_cpu, cpu);
-
- do {
- start = u64_stats_fetch_begin(&stats_cpu->syncp);
- if (type == BLKIO_STAT_CPU_SECTORS)
- tval = stats_cpu->sectors;
- else
- tval = stats_cpu->stat_arr_cpu[type][sub_type];
- } while(u64_stats_fetch_retry(&stats_cpu->syncp, start));
-
- val += tval;
- }
-
- return val;
-}
-
-static uint64_t blkio_get_stat_cpu(struct blkio_group *blkg,
- struct cgroup_map_cb *cb, dev_t dev, enum stat_type_cpu type)
-{
- uint64_t disk_total, val;
- char key_str[MAX_KEY_LEN];
- enum stat_sub_type sub_type;
- if (type == BLKIO_STAT_CPU_SECTORS) {
- val = blkio_read_stat_cpu(blkg, type, 0);
- return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, val, cb, dev);
- }
-
- for (sub_type = BLKIO_STAT_READ; sub_type < BLKIO_STAT_TOTAL;
- sub_type++) {
- blkio_get_key_name(sub_type, dev, key_str, MAX_KEY_LEN, false);
- val = blkio_read_stat_cpu(blkg, type, sub_type);
- cb->fill(cb, key_str, val);
- }
-
- disk_total = blkio_read_stat_cpu(blkg, type, BLKIO_STAT_READ) +
- blkio_read_stat_cpu(blkg, type, BLKIO_STAT_WRITE);
-
- blkio_get_key_name(BLKIO_STAT_TOTAL, dev, key_str, MAX_KEY_LEN, false);
- cb->fill(cb, key_str, disk_total);
- return disk_total;
-}
-
-/* This should be called with blkg->stats_lock held */
-static uint64_t blkio_get_stat(struct blkio_group *blkg,
- struct cgroup_map_cb *cb, dev_t dev, enum stat_type type)
-{
- uint64_t disk_total;
- char key_str[MAX_KEY_LEN];
- enum stat_sub_type sub_type;
-
- if (type == BLKIO_STAT_TIME)
- return blkio_fill_stat(key_str, MAX_KEY_LEN - 1,
- blkg->stats.time, cb, dev);
-#ifdef CONFIG_DEBUG_BLK_CGROUP
- if (type == BLKIO_STAT_UNACCOUNTED_TIME)
- return blkio_fill_stat(key_str, MAX_KEY_LEN - 1,
- blkg->stats.unaccounted_time, cb, dev);
- if (type == BLKIO_STAT_AVG_QUEUE_SIZE) {
- uint64_t sum = blkg->stats.avg_queue_size_sum;
- uint64_t samples = blkg->stats.avg_queue_size_samples;
- if (samples)
- do_div(sum, samples);
- else
- sum = 0;
- return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, sum, cb, dev);
- }
- if (type == BLKIO_STAT_GROUP_WAIT_TIME)
- return blkio_fill_stat(key_str, MAX_KEY_LEN - 1,
- blkg->stats.group_wait_time, cb, dev);
- if (type == BLKIO_STAT_IDLE_TIME)
- return blkio_fill_stat(key_str, MAX_KEY_LEN - 1,
- blkg->stats.idle_time, cb, dev);
- if (type == BLKIO_STAT_EMPTY_TIME)
- return blkio_fill_stat(key_str, MAX_KEY_LEN - 1,
- blkg->stats.empty_time, cb, dev);
- if (type == BLKIO_STAT_DEQUEUE)
- return blkio_fill_stat(key_str, MAX_KEY_LEN - 1,
- blkg->stats.dequeue, cb, dev);
-#endif
-
- for (sub_type = BLKIO_STAT_READ; sub_type < BLKIO_STAT_TOTAL;
- sub_type++) {
- blkio_get_key_name(sub_type, dev, key_str, MAX_KEY_LEN, false);
- cb->fill(cb, key_str, blkg->stats.stat_arr[type][sub_type]);
- }
- disk_total = blkg->stats.stat_arr[type][BLKIO_STAT_READ] +
- blkg->stats.stat_arr[type][BLKIO_STAT_WRITE];
- blkio_get_key_name(BLKIO_STAT_TOTAL, dev, key_str, MAX_KEY_LEN, false);
- cb->fill(cb, key_str, disk_total);
- return disk_total;
-}
-
-static int blkio_policy_parse_and_set(char *buf,
- struct blkio_policy_node *newpn, enum blkio_policy_id plid, int fileid)
-{
- struct gendisk *disk = NULL;
- char *s[4], *p, *major_s = NULL, *minor_s = NULL;
- unsigned long major, minor;
- int i = 0, ret = -EINVAL;
- int part;
- dev_t dev;
- u64 temp;
-
- memset(s, 0, sizeof(s));
-
- while ((p = strsep(&buf, " ")) != NULL) {
- if (!*p)
- continue;
-
- s[i++] = p;
-
- /* Prevent from inputing too many things */
- if (i == 3)
- break;
- }
-
- if (i != 2)
- goto out;
-
- p = strsep(&s[0], ":");
- if (p != NULL)
- major_s = p;
- else
- goto out;
-
- minor_s = s[0];
- if (!minor_s)
- goto out;
-
- if (strict_strtoul(major_s, 10, &major))
- goto out;
-
- if (strict_strtoul(minor_s, 10, &minor))
- goto out;
-
- dev = MKDEV(major, minor);
-
- if (strict_strtoull(s[1], 10, &temp))
- goto out;
-
- /* For rule removal, do not check for device presence. */
- if (temp) {
- disk = get_gendisk(dev, &part);
- if (!disk || part) {
- ret = -ENODEV;
- goto out;
- }
- }
-
- newpn->dev = dev;
-
- switch (plid) {
- case BLKIO_POLICY_PROP:
- if ((temp < BLKIO_WEIGHT_MIN && temp > 0) ||
- temp > BLKIO_WEIGHT_MAX)
- goto out;
-
- newpn->plid = plid;
- newpn->fileid = fileid;
- newpn->val.weight = temp;
- break;
- case BLKIO_POLICY_THROTL:
- switch(fileid) {
- case BLKIO_THROTL_read_bps_device:
- case BLKIO_THROTL_write_bps_device:
- newpn->plid = plid;
- newpn->fileid = fileid;
- newpn->val.bps = temp;
- break;
- case BLKIO_THROTL_read_iops_device:
- case BLKIO_THROTL_write_iops_device:
- if (temp > THROTL_IOPS_MAX)
- goto out;
-
- newpn->plid = plid;
- newpn->fileid = fileid;
- newpn->val.iops = (unsigned int)temp;
- break;
- }
- break;
- default:
- BUG();
- }
- ret = 0;
-out:
- put_disk(disk);
- return ret;
-}
-
-unsigned int blkcg_get_weight(struct blkio_cgroup *blkcg,
- dev_t dev)
-{
- struct blkio_policy_node *pn;
- unsigned long flags;
- unsigned int weight;
-
- spin_lock_irqsave(&blkcg->lock, flags);
-
- pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_PROP,
- BLKIO_PROP_weight_device);
- if (pn)
- weight = pn->val.weight;
- else
- weight = blkcg->weight;
-
- spin_unlock_irqrestore(&blkcg->lock, flags);
-
- return weight;
-}
-EXPORT_SYMBOL_GPL(blkcg_get_weight);
-
-uint64_t blkcg_get_read_bps(struct blkio_cgroup *blkcg, dev_t dev)
-{
- struct blkio_policy_node *pn;
- unsigned long flags;
- uint64_t bps = -1;
-
- spin_lock_irqsave(&blkcg->lock, flags);
- pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL,
- BLKIO_THROTL_read_bps_device);
- if (pn)
- bps = pn->val.bps;
- spin_unlock_irqrestore(&blkcg->lock, flags);
-
- return bps;
-}
-
-uint64_t blkcg_get_write_bps(struct blkio_cgroup *blkcg, dev_t dev)
-{
- struct blkio_policy_node *pn;
- unsigned long flags;
- uint64_t bps = -1;
-
- spin_lock_irqsave(&blkcg->lock, flags);
- pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL,
- BLKIO_THROTL_write_bps_device);
- if (pn)
- bps = pn->val.bps;
- spin_unlock_irqrestore(&blkcg->lock, flags);
-
- return bps;
-}
-
-unsigned int blkcg_get_read_iops(struct blkio_cgroup *blkcg, dev_t dev)
-{
- struct blkio_policy_node *pn;
- unsigned long flags;
- unsigned int iops = -1;
-
- spin_lock_irqsave(&blkcg->lock, flags);
- pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL,
- BLKIO_THROTL_read_iops_device);
- if (pn)
- iops = pn->val.iops;
- spin_unlock_irqrestore(&blkcg->lock, flags);
-
- return iops;
-}
-
-unsigned int blkcg_get_write_iops(struct blkio_cgroup *blkcg, dev_t dev)
-{
- struct blkio_policy_node *pn;
- unsigned long flags;
- unsigned int iops = -1;
-
- spin_lock_irqsave(&blkcg->lock, flags);
- pn = blkio_policy_search_node(blkcg, dev, BLKIO_POLICY_THROTL,
- BLKIO_THROTL_write_iops_device);
- if (pn)
- iops = pn->val.iops;
- spin_unlock_irqrestore(&blkcg->lock, flags);
-
- return iops;
-}
+ /*
+ * Note that stat reset is racy - it doesn't synchronize against
+ * stat updates. This is a debug feature which shouldn't exist
+ * anyway. If you get hit by a race, retry.
+ */
+ hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) {
+ for (i = 0; i < BLKCG_MAX_POLS; i++) {
+ struct blkcg_policy *pol = blkcg_policy[i];
-/* Checks whether user asked for deleting a policy rule */
-static bool blkio_delete_rule_command(struct blkio_policy_node *pn)
-{
- switch(pn->plid) {
- case BLKIO_POLICY_PROP:
- if (pn->val.weight == 0)
- return 1;
- break;
- case BLKIO_POLICY_THROTL:
- switch(pn->fileid) {
- case BLKIO_THROTL_read_bps_device:
- case BLKIO_THROTL_write_bps_device:
- if (pn->val.bps == 0)
- return 1;
- break;
- case BLKIO_THROTL_read_iops_device:
- case BLKIO_THROTL_write_iops_device:
- if (pn->val.iops == 0)
- return 1;
+ if (blkcg_policy_enabled(blkg->q, pol) &&
+ pol->pd_reset_stats_fn)
+ pol->pd_reset_stats_fn(blkg);
}
- break;
- default:
- BUG();
}
+ spin_unlock_irq(&blkcg->lock);
+ mutex_unlock(&blkcg_pol_mutex);
return 0;
}
-static void blkio_update_policy_rule(struct blkio_policy_node *oldpn,
- struct blkio_policy_node *newpn)
-{
- switch(oldpn->plid) {
- case BLKIO_POLICY_PROP:
- oldpn->val.weight = newpn->val.weight;
- break;
- case BLKIO_POLICY_THROTL:
- switch(newpn->fileid) {
- case BLKIO_THROTL_read_bps_device:
- case BLKIO_THROTL_write_bps_device:
- oldpn->val.bps = newpn->val.bps;
- break;
- case BLKIO_THROTL_read_iops_device:
- case BLKIO_THROTL_write_iops_device:
- oldpn->val.iops = newpn->val.iops;
- }
- break;
- default:
- BUG();
- }
-}
-
-/*
- * Some rules/values in blkg have changed. Propagate those to respective
- * policies.
- */
-static void blkio_update_blkg_policy(struct blkio_cgroup *blkcg,
- struct blkio_group *blkg, struct blkio_policy_node *pn)
+static const char *blkg_dev_name(struct blkcg_gq *blkg)
{
- unsigned int weight, iops;
- u64 bps;
-
- switch(pn->plid) {
- case BLKIO_POLICY_PROP:
- weight = pn->val.weight ? pn->val.weight :
- blkcg->weight;
- blkio_update_group_weight(blkg, weight);
- break;
- case BLKIO_POLICY_THROTL:
- switch(pn->fileid) {
- case BLKIO_THROTL_read_bps_device:
- case BLKIO_THROTL_write_bps_device:
- bps = pn->val.bps ? pn->val.bps : (-1);
- blkio_update_group_bps(blkg, bps, pn->fileid);
- break;
- case BLKIO_THROTL_read_iops_device:
- case BLKIO_THROTL_write_iops_device:
- iops = pn->val.iops ? pn->val.iops : (-1);
- blkio_update_group_iops(blkg, iops, pn->fileid);
- break;
- }
- break;
- default:
- BUG();
- }
+ /* some drivers (floppy) instantiate a queue w/o disk registered */
+ if (blkg->q->backing_dev_info.dev)
+ return dev_name(blkg->q->backing_dev_info.dev);
+ return NULL;
}
-/*
- * A policy node rule has been updated. Propagate this update to all the
- * block groups which might be affected by this update.
+/**
+ * blkcg_print_blkgs - helper for printing per-blkg data
+ * @sf: seq_file to print to
+ * @blkcg: blkcg of interest
+ * @prfill: fill function to print out a blkg
+ * @pol: policy in question
+ * @data: data to be passed to @prfill
+ * @show_total: to print out sum of prfill return values or not
+ *
+ * This function invokes @prfill on each blkg of @blkcg if pd for the
+ * policy specified by @pol exists. @prfill is invoked with @sf, the
+ * policy data and @data. If @show_total is %true, the sum of the return
+ * values from @prfill is printed with "Total" label at the end.
+ *
+ * This is to be used to construct print functions for
+ * cftype->read_seq_string method.
*/
-static void blkio_update_policy_node_blkg(struct blkio_cgroup *blkcg,
- struct blkio_policy_node *pn)
+void blkcg_print_blkgs(struct seq_file *sf, struct blkcg *blkcg,
+ u64 (*prfill)(struct seq_file *,
+ struct blkg_policy_data *, int),
+ const struct blkcg_policy *pol, int data,
+ bool show_total)
{
- struct blkio_group *blkg;
+ struct blkcg_gq *blkg;
struct hlist_node *n;
+ u64 total = 0;
- spin_lock(&blkio_list_lock);
spin_lock_irq(&blkcg->lock);
-
- hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) {
- if (pn->dev != blkg->dev || pn->plid != blkg->plid)
- continue;
- blkio_update_blkg_policy(blkcg, blkg, pn);
- }
-
+ hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node)
+ if (blkcg_policy_enabled(blkg->q, pol))
+ total += prfill(sf, blkg->pd[pol->plid], data);
spin_unlock_irq(&blkcg->lock);
- spin_unlock(&blkio_list_lock);
+
+ if (show_total)
+ seq_printf(sf, "Total %llu\n", (unsigned long long)total);
}
+EXPORT_SYMBOL_GPL(blkcg_print_blkgs);
-static int blkiocg_file_write(struct cgroup *cgrp, struct cftype *cft,
- const char *buffer)
+/**
+ * __blkg_prfill_u64 - prfill helper for a single u64 value
+ * @sf: seq_file to print to
+ * @pd: policy private data of interest
+ * @v: value to print
+ *
+ * Print @v to @sf for the device assocaited with @pd.
+ */
+u64 __blkg_prfill_u64(struct seq_file *sf, struct blkg_policy_data *pd, u64 v)
{
- int ret = 0;
- char *buf;
- struct blkio_policy_node *newpn, *pn;
- struct blkio_cgroup *blkcg;
- int keep_newpn = 0;
- enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private);
- int fileid = BLKIOFILE_ATTR(cft->private);
-
- buf = kstrdup(buffer, GFP_KERNEL);
- if (!buf)
- return -ENOMEM;
-
- newpn = kzalloc(sizeof(*newpn), GFP_KERNEL);
- if (!newpn) {
- ret = -ENOMEM;
- goto free_buf;
- }
-
- ret = blkio_policy_parse_and_set(buf, newpn, plid, fileid);
- if (ret)
- goto free_newpn;
-
- blkcg = cgroup_to_blkio_cgroup(cgrp);
-
- spin_lock_irq(&blkcg->lock);
-
- pn = blkio_policy_search_node(blkcg, newpn->dev, plid, fileid);
- if (!pn) {
- if (!blkio_delete_rule_command(newpn)) {
- blkio_policy_insert_node(blkcg, newpn);
- keep_newpn = 1;
- }
- spin_unlock_irq(&blkcg->lock);
- goto update_io_group;
- }
-
- if (blkio_delete_rule_command(newpn)) {
- blkio_policy_delete_node(pn);
- kfree(pn);
- spin_unlock_irq(&blkcg->lock);
- goto update_io_group;
- }
- spin_unlock_irq(&blkcg->lock);
+ const char *dname = blkg_dev_name(pd->blkg);
- blkio_update_policy_rule(pn, newpn);
+ if (!dname)
+ return 0;
-update_io_group:
- blkio_update_policy_node_blkg(blkcg, newpn);
-
-free_newpn:
- if (!keep_newpn)
- kfree(newpn);
-free_buf:
- kfree(buf);
- return ret;
+ seq_printf(sf, "%s %llu\n", dname, (unsigned long long)v);
+ return v;
}
+EXPORT_SYMBOL_GPL(__blkg_prfill_u64);
-static void
-blkio_print_policy_node(struct seq_file *m, struct blkio_policy_node *pn)
-{
- switch(pn->plid) {
- case BLKIO_POLICY_PROP:
- if (pn->fileid == BLKIO_PROP_weight_device)
- seq_printf(m, "%u:%u\t%u\n", MAJOR(pn->dev),
- MINOR(pn->dev), pn->val.weight);
- break;
- case BLKIO_POLICY_THROTL:
- switch(pn->fileid) {
- case BLKIO_THROTL_read_bps_device:
- case BLKIO_THROTL_write_bps_device:
- seq_printf(m, "%u:%u\t%llu\n", MAJOR(pn->dev),
- MINOR(pn->dev), pn->val.bps);
- break;
- case BLKIO_THROTL_read_iops_device:
- case BLKIO_THROTL_write_iops_device:
- seq_printf(m, "%u:%u\t%u\n", MAJOR(pn->dev),
- MINOR(pn->dev), pn->val.iops);
- break;
- }
- break;
- default:
- BUG();
- }
-}
+/**
+ * __blkg_prfill_rwstat - prfill helper for a blkg_rwstat
+ * @sf: seq_file to print to
+ * @pd: policy private data of interest
+ * @rwstat: rwstat to print
+ *
+ * Print @rwstat to @sf for the device assocaited with @pd.
+ */
+u64 __blkg_prfill_rwstat(struct seq_file *sf, struct blkg_policy_data *pd,
+ const struct blkg_rwstat *rwstat)
+{
+ static const char *rwstr[] = {
+ [BLKG_RWSTAT_READ] = "Read",
+ [BLKG_RWSTAT_WRITE] = "Write",
+ [BLKG_RWSTAT_SYNC] = "Sync",
+ [BLKG_RWSTAT_ASYNC] = "Async",
+ };
+ const char *dname = blkg_dev_name(pd->blkg);
+ u64 v;
+ int i;
-/* cgroup files which read their data from policy nodes end up here */
-static void blkio_read_policy_node_files(struct cftype *cft,
- struct blkio_cgroup *blkcg, struct seq_file *m)
-{
- struct blkio_policy_node *pn;
-
- if (!list_empty(&blkcg->policy_list)) {
- spin_lock_irq(&blkcg->lock);
- list_for_each_entry(pn, &blkcg->policy_list, node) {
- if (!pn_matches_cftype(cft, pn))
- continue;
- blkio_print_policy_node(m, pn);
- }
- spin_unlock_irq(&blkcg->lock);
- }
-}
+ if (!dname)
+ return 0;
-static int blkiocg_file_read(struct cgroup *cgrp, struct cftype *cft,
- struct seq_file *m)
-{
- struct blkio_cgroup *blkcg;
- enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private);
- int name = BLKIOFILE_ATTR(cft->private);
-
- blkcg = cgroup_to_blkio_cgroup(cgrp);
-
- switch(plid) {
- case BLKIO_POLICY_PROP:
- switch(name) {
- case BLKIO_PROP_weight_device:
- blkio_read_policy_node_files(cft, blkcg, m);
- return 0;
- default:
- BUG();
- }
- break;
- case BLKIO_POLICY_THROTL:
- switch(name){
- case BLKIO_THROTL_read_bps_device:
- case BLKIO_THROTL_write_bps_device:
- case BLKIO_THROTL_read_iops_device:
- case BLKIO_THROTL_write_iops_device:
- blkio_read_policy_node_files(cft, blkcg, m);
- return 0;
- default:
- BUG();
- }
- break;
- default:
- BUG();
- }
+ for (i = 0; i < BLKG_RWSTAT_NR; i++)
+ seq_printf(sf, "%s %s %llu\n", dname, rwstr[i],
+ (unsigned long long)rwstat->cnt[i]);
- return 0;
+ v = rwstat->cnt[BLKG_RWSTAT_READ] + rwstat->cnt[BLKG_RWSTAT_WRITE];
+ seq_printf(sf, "%s Total %llu\n", dname, (unsigned long long)v);
+ return v;
}
-static int blkio_read_blkg_stats(struct blkio_cgroup *blkcg,
- struct cftype *cft, struct cgroup_map_cb *cb,
- enum stat_type type, bool show_total, bool pcpu)
+/**
+ * blkg_prfill_stat - prfill callback for blkg_stat
+ * @sf: seq_file to print to
+ * @pd: policy private data of interest
+ * @off: offset to the blkg_stat in @pd
+ *
+ * prfill callback for printing a blkg_stat.
+ */
+u64 blkg_prfill_stat(struct seq_file *sf, struct blkg_policy_data *pd, int off)
{
- struct blkio_group *blkg;
- struct hlist_node *n;
- uint64_t cgroup_total = 0;
-
- rcu_read_lock();
- hlist_for_each_entry_rcu(blkg, n, &blkcg->blkg_list, blkcg_node) {
- if (blkg->dev) {
- if (!cftype_blkg_same_policy(cft, blkg))
- continue;
- if (pcpu)
- cgroup_total += blkio_get_stat_cpu(blkg, cb,
- blkg->dev, type);
- else {
- spin_lock_irq(&blkg->stats_lock);
- cgroup_total += blkio_get_stat(blkg, cb,
- blkg->dev, type);
- spin_unlock_irq(&blkg->stats_lock);
- }
- }
- }
- if (show_total)
- cb->fill(cb, "Total", cgroup_total);
- rcu_read_unlock();
- return 0;
+ return __blkg_prfill_u64(sf, pd, blkg_stat_read((void *)pd + off));
}
+EXPORT_SYMBOL_GPL(blkg_prfill_stat);
-/* All map kind of cgroup file get serviced by this function */
-static int blkiocg_file_read_map(struct cgroup *cgrp, struct cftype *cft,
- struct cgroup_map_cb *cb)
+/**
+ * blkg_prfill_rwstat - prfill callback for blkg_rwstat
+ * @sf: seq_file to print to
+ * @pd: policy private data of interest
+ * @off: offset to the blkg_rwstat in @pd
+ *
+ * prfill callback for printing a blkg_rwstat.
+ */
+u64 blkg_prfill_rwstat(struct seq_file *sf, struct blkg_policy_data *pd,
+ int off)
{
- struct blkio_cgroup *blkcg;
- enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private);
- int name = BLKIOFILE_ATTR(cft->private);
-
- blkcg = cgroup_to_blkio_cgroup(cgrp);
-
- switch(plid) {
- case BLKIO_POLICY_PROP:
- switch(name) {
- case BLKIO_PROP_time:
- return blkio_read_blkg_stats(blkcg, cft, cb,
- BLKIO_STAT_TIME, 0, 0);
- case BLKIO_PROP_sectors:
- return blkio_read_blkg_stats(blkcg, cft, cb,
- BLKIO_STAT_CPU_SECTORS, 0, 1);
- case BLKIO_PROP_io_service_bytes:
- return blkio_read_blkg_stats(blkcg, cft, cb,
- BLKIO_STAT_CPU_SERVICE_BYTES, 1, 1);
- case BLKIO_PROP_io_serviced:
- return blkio_read_blkg_stats(blkcg, cft, cb,
- BLKIO_STAT_CPU_SERVICED, 1, 1);
- case BLKIO_PROP_io_service_time:
- return blkio_read_blkg_stats(blkcg, cft, cb,
- BLKIO_STAT_SERVICE_TIME, 1, 0);
- case BLKIO_PROP_io_wait_time:
- return blkio_read_blkg_stats(blkcg, cft, cb,
- BLKIO_STAT_WAIT_TIME, 1, 0);
- case BLKIO_PROP_io_merged:
- return blkio_read_blkg_stats(blkcg, cft, cb,
- BLKIO_STAT_CPU_MERGED, 1, 1);
- case BLKIO_PROP_io_queued:
- return blkio_read_blkg_stats(blkcg, cft, cb,
- BLKIO_STAT_QUEUED, 1, 0);
-#ifdef CONFIG_DEBUG_BLK_CGROUP
- case BLKIO_PROP_unaccounted_time:
- return blkio_read_blkg_stats(blkcg, cft, cb,
- BLKIO_STAT_UNACCOUNTED_TIME, 0, 0);
- case BLKIO_PROP_dequeue:
- return blkio_read_blkg_stats(blkcg, cft, cb,
- BLKIO_STAT_DEQUEUE, 0, 0);
- case BLKIO_PROP_avg_queue_size:
- return blkio_read_blkg_stats(blkcg, cft, cb,
- BLKIO_STAT_AVG_QUEUE_SIZE, 0, 0);
- case BLKIO_PROP_group_wait_time:
- return blkio_read_blkg_stats(blkcg, cft, cb,
- BLKIO_STAT_GROUP_WAIT_TIME, 0, 0);
- case BLKIO_PROP_idle_time:
- return blkio_read_blkg_stats(blkcg, cft, cb,
- BLKIO_STAT_IDLE_TIME, 0, 0);
- case BLKIO_PROP_empty_time:
- return blkio_read_blkg_stats(blkcg, cft, cb,
- BLKIO_STAT_EMPTY_TIME, 0, 0);
-#endif
- default:
- BUG();
- }
- break;
- case BLKIO_POLICY_THROTL:
- switch(name){
- case BLKIO_THROTL_io_service_bytes:
- return blkio_read_blkg_stats(blkcg, cft, cb,
- BLKIO_STAT_CPU_SERVICE_BYTES, 1, 1);
- case BLKIO_THROTL_io_serviced:
- return blkio_read_blkg_stats(blkcg, cft, cb,
- BLKIO_STAT_CPU_SERVICED, 1, 1);
- default:
- BUG();
- }
- break;
- default:
- BUG();
- }
+ struct blkg_rwstat rwstat = blkg_rwstat_read((void *)pd + off);
- return 0;
+ return __blkg_prfill_rwstat(sf, pd, &rwstat);
}
+EXPORT_SYMBOL_GPL(blkg_prfill_rwstat);
-static int blkio_weight_write(struct blkio_cgroup *blkcg, u64 val)
+/**
+ * blkg_conf_prep - parse and prepare for per-blkg config update
+ * @blkcg: target block cgroup
+ * @pol: target policy
+ * @input: input string
+ * @ctx: blkg_conf_ctx to be filled
+ *
+ * Parse per-blkg config update from @input and initialize @ctx with the
+ * result. @ctx->blkg points to the blkg to be updated and @ctx->v the new
+ * value. This function returns with RCU read lock and queue lock held and
+ * must be paired with blkg_conf_finish().
+ */
+int blkg_conf_prep(struct blkcg *blkcg, const struct blkcg_policy *pol,
+ const char *input, struct blkg_conf_ctx *ctx)
+ __acquires(rcu) __acquires(disk->queue->queue_lock)
{
- struct blkio_group *blkg;
- struct hlist_node *n;
- struct blkio_policy_node *pn;
+ struct gendisk *disk;
+ struct blkcg_gq *blkg;
+ unsigned int major, minor;
+ unsigned long long v;
+ int part, ret;
- if (val < BLKIO_WEIGHT_MIN || val > BLKIO_WEIGHT_MAX)
+ if (sscanf(input, "%u:%u %llu", &major, &minor, &v) != 3)
return -EINVAL;
- spin_lock(&blkio_list_lock);
- spin_lock_irq(&blkcg->lock);
- blkcg->weight = (unsigned int)val;
-
- hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) {
- pn = blkio_policy_search_node(blkcg, blkg->dev,
- BLKIO_POLICY_PROP, BLKIO_PROP_weight_device);
- if (pn)
- continue;
-
- blkio_update_group_weight(blkg, blkcg->weight);
- }
- spin_unlock_irq(&blkcg->lock);
- spin_unlock(&blkio_list_lock);
- return 0;
-}
+ disk = get_gendisk(MKDEV(major, minor), &part);
+ if (!disk || part)
+ return -EINVAL;
-static u64 blkiocg_file_read_u64 (struct cgroup *cgrp, struct cftype *cft) {
- struct blkio_cgroup *blkcg;
- enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private);
- int name = BLKIOFILE_ATTR(cft->private);
+ rcu_read_lock();
+ spin_lock_irq(disk->queue->queue_lock);
- blkcg = cgroup_to_blkio_cgroup(cgrp);
+ if (blkcg_policy_enabled(disk->queue, pol))
+ blkg = blkg_lookup_create(blkcg, disk->queue);
+ else
+ blkg = ERR_PTR(-EINVAL);
- switch(plid) {
- case BLKIO_POLICY_PROP:
- switch(name) {
- case BLKIO_PROP_weight:
- return (u64)blkcg->weight;
+ if (IS_ERR(blkg)) {
+ ret = PTR_ERR(blkg);
+ rcu_read_unlock();
+ spin_unlock_irq(disk->queue->queue_lock);
+ put_disk(disk);
+ /*
+ * If queue was bypassing, we should retry. Do so after a
+ * short msleep(). It isn't strictly necessary but queue
+ * can be bypassing for some time and it's always nice to
+ * avoid busy looping.
+ */
+ if (ret == -EBUSY) {
+ msleep(10);
+ ret = restart_syscall();
}
- break;
- default:
- BUG();
+ return ret;
}
+
+ ctx->disk = disk;
+ ctx->blkg = blkg;
+ ctx->v = v;
return 0;
}
+EXPORT_SYMBOL_GPL(blkg_conf_prep);
-static int
-blkiocg_file_write_u64(struct cgroup *cgrp, struct cftype *cft, u64 val)
+/**
+ * blkg_conf_finish - finish up per-blkg config update
+ * @ctx: blkg_conf_ctx intiailized by blkg_conf_prep()
+ *
+ * Finish up after per-blkg config update. This function must be paired
+ * with blkg_conf_prep().
+ */
+void blkg_conf_finish(struct blkg_conf_ctx *ctx)
+ __releases(ctx->disk->queue->queue_lock) __releases(rcu)
{
- struct blkio_cgroup *blkcg;
- enum blkio_policy_id plid = BLKIOFILE_POLICY(cft->private);
- int name = BLKIOFILE_ATTR(cft->private);
-
- blkcg = cgroup_to_blkio_cgroup(cgrp);
-
- switch(plid) {
- case BLKIO_POLICY_PROP:
- switch(name) {
- case BLKIO_PROP_weight:
- return blkio_weight_write(blkcg, val);
- }
- break;
- default:
- BUG();
- }
-
- return 0;
+ spin_unlock_irq(ctx->disk->queue->queue_lock);
+ rcu_read_unlock();
+ put_disk(ctx->disk);
}
+EXPORT_SYMBOL_GPL(blkg_conf_finish);
-struct cftype blkio_files[] = {
- {
- .name = "weight_device",
- .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP,
- BLKIO_PROP_weight_device),
- .read_seq_string = blkiocg_file_read,
- .write_string = blkiocg_file_write,
- .max_write_len = 256,
- },
- {
- .name = "weight",
- .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP,
- BLKIO_PROP_weight),
- .read_u64 = blkiocg_file_read_u64,
- .write_u64 = blkiocg_file_write_u64,
- },
- {
- .name = "time",
- .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP,
- BLKIO_PROP_time),
- .read_map = blkiocg_file_read_map,
- },
- {
- .name = "sectors",
- .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP,
- BLKIO_PROP_sectors),
- .read_map = blkiocg_file_read_map,
- },
- {
- .name = "io_service_bytes",
- .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP,
- BLKIO_PROP_io_service_bytes),
- .read_map = blkiocg_file_read_map,
- },
- {
- .name = "io_serviced",
- .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP,
- BLKIO_PROP_io_serviced),
- .read_map = blkiocg_file_read_map,
- },
- {
- .name = "io_service_time",
- .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP,
- BLKIO_PROP_io_service_time),
- .read_map = blkiocg_file_read_map,
- },
- {
- .name = "io_wait_time",
- .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP,
- BLKIO_PROP_io_wait_time),
- .read_map = blkiocg_file_read_map,
- },
- {
- .name = "io_merged",
- .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP,
- BLKIO_PROP_io_merged),
- .read_map = blkiocg_file_read_map,
- },
- {
- .name = "io_queued",
- .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP,
- BLKIO_PROP_io_queued),
- .read_map = blkiocg_file_read_map,
- },
+struct cftype blkcg_files[] = {
{
.name = "reset_stats",
- .write_u64 = blkiocg_reset_stats,
- },
-#ifdef CONFIG_BLK_DEV_THROTTLING
- {
- .name = "throttle.read_bps_device",
- .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL,
- BLKIO_THROTL_read_bps_device),
- .read_seq_string = blkiocg_file_read,
- .write_string = blkiocg_file_write,
- .max_write_len = 256,
- },
-
- {
- .name = "throttle.write_bps_device",
- .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL,
- BLKIO_THROTL_write_bps_device),
- .read_seq_string = blkiocg_file_read,
- .write_string = blkiocg_file_write,
- .max_write_len = 256,
- },
-
- {
- .name = "throttle.read_iops_device",
- .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL,
- BLKIO_THROTL_read_iops_device),
- .read_seq_string = blkiocg_file_read,
- .write_string = blkiocg_file_write,
- .max_write_len = 256,
- },
-
- {
- .name = "throttle.write_iops_device",
- .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL,
- BLKIO_THROTL_write_iops_device),
- .read_seq_string = blkiocg_file_read,
- .write_string = blkiocg_file_write,
- .max_write_len = 256,
- },
- {
- .name = "throttle.io_service_bytes",
- .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL,
- BLKIO_THROTL_io_service_bytes),
- .read_map = blkiocg_file_read_map,
- },
- {
- .name = "throttle.io_serviced",
- .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_THROTL,
- BLKIO_THROTL_io_serviced),
- .read_map = blkiocg_file_read_map,
- },
-#endif /* CONFIG_BLK_DEV_THROTTLING */
-
-#ifdef CONFIG_DEBUG_BLK_CGROUP
- {
- .name = "avg_queue_size",
- .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP,
- BLKIO_PROP_avg_queue_size),
- .read_map = blkiocg_file_read_map,
+ .write_u64 = blkcg_reset_stats,
},
- {
- .name = "group_wait_time",
- .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP,
- BLKIO_PROP_group_wait_time),
- .read_map = blkiocg_file_read_map,
- },
- {
- .name = "idle_time",
- .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP,
- BLKIO_PROP_idle_time),
- .read_map = blkiocg_file_read_map,
- },
- {
- .name = "empty_time",
- .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP,
- BLKIO_PROP_empty_time),
- .read_map = blkiocg_file_read_map,
- },
- {
- .name = "dequeue",
- .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP,
- BLKIO_PROP_dequeue),
- .read_map = blkiocg_file_read_map,
- },
- {
- .name = "unaccounted_time",
- .private = BLKIOFILE_PRIVATE(BLKIO_POLICY_PROP,
- BLKIO_PROP_unaccounted_time),
- .read_map = blkiocg_file_read_map,
- },
-#endif
{ } /* terminate */
};
-static void blkiocg_destroy(struct cgroup *cgroup)
+/**
+ * blkcg_pre_destroy - cgroup pre_destroy callback
+ * @cgroup: cgroup of interest
+ *
+ * This function is called when @cgroup is about to go away and responsible
+ * for shooting down all blkgs associated with @cgroup. blkgs should be
+ * removed while holding both q and blkcg locks. As blkcg lock is nested
+ * inside q lock, this function performs reverse double lock dancing.
+ *
+ * This is the blkcg counterpart of ioc_release_fn().
+ */
+static int blkcg_pre_destroy(struct cgroup *cgroup)
{
- struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgroup);
- unsigned long flags;
- struct blkio_group *blkg;
- void *key;
- struct blkio_policy_type *blkiop;
- struct blkio_policy_node *pn, *pntmp;
+ struct blkcg *blkcg = cgroup_to_blkcg(cgroup);
- rcu_read_lock();
- do {
- spin_lock_irqsave(&blkcg->lock, flags);
+ spin_lock_irq(&blkcg->lock);
- if (hlist_empty(&blkcg->blkg_list)) {
- spin_unlock_irqrestore(&blkcg->lock, flags);
- break;
+ while (!hlist_empty(&blkcg->blkg_list)) {
+ struct blkcg_gq *blkg = hlist_entry(blkcg->blkg_list.first,
+ struct blkcg_gq, blkcg_node);
+ struct request_queue *q = blkg->q;
+
+ if (spin_trylock(q->queue_lock)) {
+ blkg_destroy(blkg);
+ spin_unlock(q->queue_lock);
+ } else {
+ spin_unlock_irq(&blkcg->lock);
+ cpu_relax();
+ spin_lock_irq(&blkcg->lock);
}
+ }
- blkg = hlist_entry(blkcg->blkg_list.first, struct blkio_group,
- blkcg_node);
- key = rcu_dereference(blkg->key);
- __blkiocg_del_blkio_group(blkg);
-
- spin_unlock_irqrestore(&blkcg->lock, flags);
-
- /*
- * This blkio_group is being unlinked as associated cgroup is
- * going away. Let all the IO controlling policies know about
- * this event.
- */
- spin_lock(&blkio_list_lock);
- list_for_each_entry(blkiop, &blkio_list, list) {
- if (blkiop->plid != blkg->plid)
- continue;
- blkiop->ops.blkio_unlink_group_fn(key, blkg);
- }
- spin_unlock(&blkio_list_lock);
- } while (1);
+ spin_unlock_irq(&blkcg->lock);
+ return 0;
+}
- list_for_each_entry_safe(pn, pntmp, &blkcg->policy_list, node) {
- blkio_policy_delete_node(pn);
- kfree(pn);
- }
+static void blkcg_destroy(struct cgroup *cgroup)
+{
+ struct blkcg *blkcg = cgroup_to_blkcg(cgroup);
- free_css_id(&blkio_subsys, &blkcg->css);
- rcu_read_unlock();
- if (blkcg != &blkio_root_cgroup)
+ if (blkcg != &blkcg_root)
kfree(blkcg);
}
-static struct cgroup_subsys_state *blkiocg_create(struct cgroup *cgroup)
+static struct cgroup_subsys_state *blkcg_create(struct cgroup *cgroup)
{
- struct blkio_cgroup *blkcg;
+ static atomic64_t id_seq = ATOMIC64_INIT(0);
+ struct blkcg *blkcg;
struct cgroup *parent = cgroup->parent;
if (!parent) {
- blkcg = &blkio_root_cgroup;
+ blkcg = &blkcg_root;
goto done;
}
@@ -1582,22 +624,68 @@ static struct cgroup_subsys_state *blkiocg_create(struct cgroup *cgroup)
if (!blkcg)
return ERR_PTR(-ENOMEM);
- blkcg->weight = BLKIO_WEIGHT_DEFAULT;
+ blkcg->cfq_weight = CFQ_WEIGHT_DEFAULT;
+ blkcg->id = atomic64_inc_return(&id_seq); /* root is 0, start from 1 */
done:
spin_lock_init(&blkcg->lock);
+ INIT_RADIX_TREE(&blkcg->blkg_tree, GFP_ATOMIC);
INIT_HLIST_HEAD(&blkcg->blkg_list);
- INIT_LIST_HEAD(&blkcg->policy_list);
return &blkcg->css;
}
+/**
+ * blkcg_init_queue - initialize blkcg part of request queue
+ * @q: request_queue to initialize
+ *
+ * Called from blk_alloc_queue_node(). Responsible for initializing blkcg
+ * part of new request_queue @q.
+ *
+ * RETURNS:
+ * 0 on success, -errno on failure.
+ */
+int blkcg_init_queue(struct request_queue *q)
+{
+ might_sleep();
+
+ return blk_throtl_init(q);
+}
+
+/**
+ * blkcg_drain_queue - drain blkcg part of request_queue
+ * @q: request_queue to drain
+ *
+ * Called from blk_drain_queue(). Responsible for draining blkcg part.
+ */
+void blkcg_drain_queue(struct request_queue *q)
+{
+ lockdep_assert_held(q->queue_lock);
+
+ blk_throtl_drain(q);
+}
+
+/**
+ * blkcg_exit_queue - exit and release blkcg part of request_queue
+ * @q: request_queue being released
+ *
+ * Called from blk_release_queue(). Responsible for exiting blkcg part.
+ */
+void blkcg_exit_queue(struct request_queue *q)
+{
+ spin_lock_irq(q->queue_lock);
+ blkg_destroy_all(q);
+ spin_unlock_irq(q->queue_lock);
+
+ blk_throtl_exit(q);
+}
+
/*
* We cannot support shared io contexts, as we have no mean to support
* two tasks with the same ioc in two different groups without major rework
* of the main cic data structures. For now we allow a task to change
* its cgroup only if it's the only owner of its ioc.
*/
-static int blkiocg_can_attach(struct cgroup *cgrp, struct cgroup_taskset *tset)
+static int blkcg_can_attach(struct cgroup *cgrp, struct cgroup_taskset *tset)
{
struct task_struct *task;
struct io_context *ioc;
@@ -1616,63 +704,213 @@ static int blkiocg_can_attach(struct cgroup *cgrp, struct cgroup_taskset *tset)
return ret;
}
-static void blkiocg_attach(struct cgroup *cgrp, struct cgroup_taskset *tset)
-{
- struct task_struct *task;
- struct io_context *ioc;
-
- cgroup_taskset_for_each(task, cgrp, tset) {
- /* we don't lose anything even if ioc allocation fails */
- ioc = get_task_io_context(task, GFP_ATOMIC, NUMA_NO_NODE);
- if (ioc) {
- ioc_cgroup_changed(ioc);
- put_io_context(ioc);
- }
- }
-}
-
struct cgroup_subsys blkio_subsys = {
.name = "blkio",
- .create = blkiocg_create,
- .can_attach = blkiocg_can_attach,
- .attach = blkiocg_attach,
- .destroy = blkiocg_destroy,
-#ifdef CONFIG_BLK_CGROUP
- /* note: blkio_subsys_id is otherwise defined in blk-cgroup.h */
+ .create = blkcg_create,
+ .can_attach = blkcg_can_attach,
+ .pre_destroy = blkcg_pre_destroy,
+ .destroy = blkcg_destroy,
.subsys_id = blkio_subsys_id,
-#endif
- .base_cftypes = blkio_files,
- .use_id = 1,
+ .base_cftypes = blkcg_files,
.module = THIS_MODULE,
};
EXPORT_SYMBOL_GPL(blkio_subsys);
-void blkio_policy_register(struct blkio_policy_type *blkiop)
+/**
+ * blkcg_activate_policy - activate a blkcg policy on a request_queue
+ * @q: request_queue of interest
+ * @pol: blkcg policy to activate
+ *
+ * Activate @pol on @q. Requires %GFP_KERNEL context. @q goes through
+ * bypass mode to populate its blkgs with policy_data for @pol.
+ *
+ * Activation happens with @q bypassed, so nobody would be accessing blkgs
+ * from IO path. Update of each blkg is protected by both queue and blkcg
+ * locks so that holding either lock and testing blkcg_policy_enabled() is
+ * always enough for dereferencing policy data.
+ *
+ * The caller is responsible for synchronizing [de]activations and policy
+ * [un]registerations. Returns 0 on success, -errno on failure.
+ */
+int blkcg_activate_policy(struct request_queue *q,
+ const struct blkcg_policy *pol)
{
- spin_lock(&blkio_list_lock);
- list_add_tail(&blkiop->list, &blkio_list);
- spin_unlock(&blkio_list_lock);
+ LIST_HEAD(pds);
+ struct blkcg_gq *blkg;
+ struct blkg_policy_data *pd, *n;
+ int cnt = 0, ret;
+
+ if (blkcg_policy_enabled(q, pol))
+ return 0;
+
+ blk_queue_bypass_start(q);
+
+ /* make sure the root blkg exists and count the existing blkgs */
+ spin_lock_irq(q->queue_lock);
+
+ rcu_read_lock();
+ blkg = __blkg_lookup_create(&blkcg_root, q);
+ rcu_read_unlock();
+
+ if (IS_ERR(blkg)) {
+ ret = PTR_ERR(blkg);
+ goto out_unlock;
+ }
+ q->root_blkg = blkg;
+
+ list_for_each_entry(blkg, &q->blkg_list, q_node)
+ cnt++;
+
+ spin_unlock_irq(q->queue_lock);
+
+ /* allocate policy_data for all existing blkgs */
+ while (cnt--) {
+ pd = kzalloc_node(pol->pd_size, GFP_KERNEL, q->node);
+ if (!pd) {
+ ret = -ENOMEM;
+ goto out_free;
+ }
+ list_add_tail(&pd->alloc_node, &pds);
+ }
+
+ /*
+ * Install the allocated pds. With @q bypassing, no new blkg
+ * should have been created while the queue lock was dropped.
+ */
+ spin_lock_irq(q->queue_lock);
+
+ list_for_each_entry(blkg, &q->blkg_list, q_node) {
+ if (WARN_ON(list_empty(&pds))) {
+ /* umm... this shouldn't happen, just abort */
+ ret = -ENOMEM;
+ goto out_unlock;
+ }
+ pd = list_first_entry(&pds, struct blkg_policy_data, alloc_node);
+ list_del_init(&pd->alloc_node);
+
+ /* grab blkcg lock too while installing @pd on @blkg */
+ spin_lock(&blkg->blkcg->lock);
+
+ blkg->pd[pol->plid] = pd;
+ pd->blkg = blkg;
+ pol->pd_init_fn(blkg);
+
+ spin_unlock(&blkg->blkcg->lock);
+ }
+
+ __set_bit(pol->plid, q->blkcg_pols);
+ ret = 0;
+out_unlock:
+ spin_unlock_irq(q->queue_lock);
+out_free:
+ blk_queue_bypass_end(q);
+ list_for_each_entry_safe(pd, n, &pds, alloc_node)
+ kfree(pd);
+ return ret;
}
-EXPORT_SYMBOL_GPL(blkio_policy_register);
+EXPORT_SYMBOL_GPL(blkcg_activate_policy);
-void blkio_policy_unregister(struct blkio_policy_type *blkiop)
+/**
+ * blkcg_deactivate_policy - deactivate a blkcg policy on a request_queue
+ * @q: request_queue of interest
+ * @pol: blkcg policy to deactivate
+ *
+ * Deactivate @pol on @q. Follows the same synchronization rules as
+ * blkcg_activate_policy().
+ */
+void blkcg_deactivate_policy(struct request_queue *q,
+ const struct blkcg_policy *pol)
{
- spin_lock(&blkio_list_lock);
- list_del_init(&blkiop->list);
- spin_unlock(&blkio_list_lock);
+ struct blkcg_gq *blkg;
+
+ if (!blkcg_policy_enabled(q, pol))
+ return;
+
+ blk_queue_bypass_start(q);
+ spin_lock_irq(q->queue_lock);
+
+ __clear_bit(pol->plid, q->blkcg_pols);
+
+ /* if no policy is left, no need for blkgs - shoot them down */
+ if (bitmap_empty(q->blkcg_pols, BLKCG_MAX_POLS))
+ blkg_destroy_all(q);
+
+ list_for_each_entry(blkg, &q->blkg_list, q_node) {
+ /* grab blkcg lock too while removing @pd from @blkg */
+ spin_lock(&blkg->blkcg->lock);
+
+ if (pol->pd_exit_fn)
+ pol->pd_exit_fn(blkg);
+
+ kfree(blkg->pd[pol->plid]);
+ blkg->pd[pol->plid] = NULL;
+
+ spin_unlock(&blkg->blkcg->lock);
+ }
+
+ spin_unlock_irq(q->queue_lock);
+ blk_queue_bypass_end(q);
}
-EXPORT_SYMBOL_GPL(blkio_policy_unregister);
+EXPORT_SYMBOL_GPL(blkcg_deactivate_policy);
-static int __init init_cgroup_blkio(void)
+/**
+ * blkcg_policy_register - register a blkcg policy
+ * @pol: blkcg policy to register
+ *
+ * Register @pol with blkcg core. Might sleep and @pol may be modified on
+ * successful registration. Returns 0 on success and -errno on failure.
+ */
+int blkcg_policy_register(struct blkcg_policy *pol)
{
- return cgroup_load_subsys(&blkio_subsys);
+ int i, ret;
+
+ if (WARN_ON(pol->pd_size < sizeof(struct blkg_policy_data)))
+ return -EINVAL;
+
+ mutex_lock(&blkcg_pol_mutex);
+
+ /* find an empty slot */
+ ret = -ENOSPC;
+ for (i = 0; i < BLKCG_MAX_POLS; i++)
+ if (!blkcg_policy[i])
+ break;
+ if (i >= BLKCG_MAX_POLS)
+ goto out_unlock;
+
+ /* register and update blkgs */
+ pol->plid = i;
+ blkcg_policy[i] = pol;
+
+ /* everything is in place, add intf files for the new policy */
+ if (pol->cftypes)
+ WARN_ON(cgroup_add_cftypes(&blkio_subsys, pol->cftypes));
+ ret = 0;
+out_unlock:
+ mutex_unlock(&blkcg_pol_mutex);
+ return ret;
}
+EXPORT_SYMBOL_GPL(blkcg_policy_register);
-static void __exit exit_cgroup_blkio(void)
+/**
+ * blkcg_policy_unregister - unregister a blkcg policy
+ * @pol: blkcg policy to unregister
+ *
+ * Undo blkcg_policy_register(@pol). Might sleep.
+ */
+void blkcg_policy_unregister(struct blkcg_policy *pol)
{
- cgroup_unload_subsys(&blkio_subsys);
-}
+ mutex_lock(&blkcg_pol_mutex);
-module_init(init_cgroup_blkio);
-module_exit(exit_cgroup_blkio);
-MODULE_LICENSE("GPL");
+ if (WARN_ON(blkcg_policy[pol->plid] != pol))
+ goto out_unlock;
+
+ /* kill the intf files first */
+ if (pol->cftypes)
+ cgroup_rm_cftypes(&blkio_subsys, pol->cftypes);
+
+ /* unregister and update blkgs */
+ blkcg_policy[pol->plid] = NULL;
+out_unlock:
+ mutex_unlock(&blkcg_pol_mutex);
+}
+EXPORT_SYMBOL_GPL(blkcg_policy_unregister);
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index 6f3ace7e792..8ac457ce778 100644
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -15,350 +15,371 @@
#include <linux/cgroup.h>
#include <linux/u64_stats_sync.h>
-
-enum blkio_policy_id {
- BLKIO_POLICY_PROP = 0, /* Proportional Bandwidth division */
- BLKIO_POLICY_THROTL, /* Throttling */
-};
+#include <linux/seq_file.h>
+#include <linux/radix-tree.h>
/* Max limits for throttle policy */
#define THROTL_IOPS_MAX UINT_MAX
-#if defined(CONFIG_BLK_CGROUP) || defined(CONFIG_BLK_CGROUP_MODULE)
-
-#ifndef CONFIG_BLK_CGROUP
-/* When blk-cgroup is a module, its subsys_id isn't a compile-time constant */
-extern struct cgroup_subsys blkio_subsys;
-#define blkio_subsys_id blkio_subsys.subsys_id
-#endif
-
-enum stat_type {
- /* Total time spent (in ns) between request dispatch to the driver and
- * request completion for IOs doen by this cgroup. This may not be
- * accurate when NCQ is turned on. */
- BLKIO_STAT_SERVICE_TIME = 0,
- /* Total time spent waiting in scheduler queue in ns */
- BLKIO_STAT_WAIT_TIME,
- /* Number of IOs queued up */
- BLKIO_STAT_QUEUED,
- /* All the single valued stats go below this */
- BLKIO_STAT_TIME,
-#ifdef CONFIG_DEBUG_BLK_CGROUP
- /* Time not charged to this cgroup */
- BLKIO_STAT_UNACCOUNTED_TIME,
- BLKIO_STAT_AVG_QUEUE_SIZE,
- BLKIO_STAT_IDLE_TIME,
- BLKIO_STAT_EMPTY_TIME,
- BLKIO_STAT_GROUP_WAIT_TIME,
- BLKIO_STAT_DEQUEUE
-#endif
-};
+/* CFQ specific, out here for blkcg->cfq_weight */
+#define CFQ_WEIGHT_MIN 10
+#define CFQ_WEIGHT_MAX 1000
+#define CFQ_WEIGHT_DEFAULT 500
-/* Per cpu stats */
-enum stat_type_cpu {
- BLKIO_STAT_CPU_SECTORS,
- /* Total bytes transferred */
- BLKIO_STAT_CPU_SERVICE_BYTES,
- /* Total IOs serviced, post merge */
- BLKIO_STAT_CPU_SERVICED,
- /* Number of IOs merged */
- BLKIO_STAT_CPU_MERGED,
- BLKIO_STAT_CPU_NR
-};
+#ifdef CONFIG_BLK_CGROUP
-enum stat_sub_type {
- BLKIO_STAT_READ = 0,
- BLKIO_STAT_WRITE,
- BLKIO_STAT_SYNC,
- BLKIO_STAT_ASYNC,
- BLKIO_STAT_TOTAL
-};
+enum blkg_rwstat_type {
+ BLKG_RWSTAT_READ,
+ BLKG_RWSTAT_WRITE,
+ BLKG_RWSTAT_SYNC,
+ BLKG_RWSTAT_ASYNC,
-/* blkg state flags */
-enum blkg_state_flags {
- BLKG_waiting = 0,
- BLKG_idling,
- BLKG_empty,
+ BLKG_RWSTAT_NR,
+ BLKG_RWSTAT_TOTAL = BLKG_RWSTAT_NR,
};
-/* cgroup files owned by proportional weight policy */
-enum blkcg_file_name_prop {
- BLKIO_PROP_weight = 1,
- BLKIO_PROP_weight_device,
- BLKIO_PROP_io_service_bytes,
- BLKIO_PROP_io_serviced,
- BLKIO_PROP_time,
- BLKIO_PROP_sectors,
- BLKIO_PROP_unaccounted_time,
- BLKIO_PROP_io_service_time,
- BLKIO_PROP_io_wait_time,
- BLKIO_PROP_io_merged,
- BLKIO_PROP_io_queued,
- BLKIO_PROP_avg_queue_size,
- BLKIO_PROP_group_wait_time,
- BLKIO_PROP_idle_time,
- BLKIO_PROP_empty_time,
- BLKIO_PROP_dequeue,
-};
+struct blkcg_gq;
-/* cgroup files owned by throttle policy */
-enum blkcg_file_name_throtl {
- BLKIO_THROTL_read_bps_device,
- BLKIO_THROTL_write_bps_device,
- BLKIO_THROTL_read_iops_device,
- BLKIO_THROTL_write_iops_device,
- BLKIO_THROTL_io_service_bytes,
- BLKIO_THROTL_io_serviced,
-};
+struct blkcg {
+ struct cgroup_subsys_state css;
+ spinlock_t lock;
-struct blkio_cgroup {
- struct cgroup_subsys_state css;
- unsigned int weight;
- spinlock_t lock;
- struct hlist_head blkg_list;
- struct list_head policy_list; /* list of blkio_policy_node */
-};
+ struct radix_tree_root blkg_tree;
+ struct blkcg_gq *blkg_hint;
+ struct hlist_head blkg_list;
+
+ /* for policies to test whether associated blkcg has changed */
+ uint64_t id;
-struct blkio_group_stats {
- /* total disk time and nr sectors dispatched by this group */
- uint64_t time;
- uint64_t stat_arr[BLKIO_STAT_QUEUED + 1][BLKIO_STAT_TOTAL];
-#ifdef CONFIG_DEBUG_BLK_CGROUP
- /* Time not charged to this cgroup */
- uint64_t unaccounted_time;
-
- /* Sum of number of IOs queued across all samples */
- uint64_t avg_queue_size_sum;
- /* Count of samples taken for average */
- uint64_t avg_queue_size_samples;
- /* How many times this group has been removed from service tree */
- unsigned long dequeue;
-
- /* Total time spent waiting for it to be assigned a timeslice. */
- uint64_t group_wait_time;
- uint64_t start_group_wait_time;
-
- /* Time spent idling for this blkio_group */
- uint64_t idle_time;
- uint64_t start_idle_time;
- /*
- * Total time when we have requests queued and do not contain the
- * current active queue.
- */
- uint64_t empty_time;
- uint64_t start_empty_time;
- uint16_t flags;
-#endif
+ /* TODO: per-policy storage in blkcg */
+ unsigned int cfq_weight; /* belongs to cfq */
};
-/* Per cpu blkio group stats */
-struct blkio_group_stats_cpu {
- uint64_t sectors;
- uint64_t stat_arr_cpu[BLKIO_STAT_CPU_NR][BLKIO_STAT_TOTAL];
- struct u64_stats_sync syncp;
+struct blkg_stat {
+ struct u64_stats_sync syncp;
+ uint64_t cnt;
};
-struct blkio_group {
- /* An rcu protected unique identifier for the group */
- void *key;
- struct hlist_node blkcg_node;
- unsigned short blkcg_id;
- /* Store cgroup path */
- char path[128];
- /* The device MKDEV(major, minor), this group has been created for */
- dev_t dev;
- /* policy which owns this blk group */
- enum blkio_policy_id plid;
-
- /* Need to serialize the stats in the case of reset/update */
- spinlock_t stats_lock;
- struct blkio_group_stats stats;
- /* Per cpu stats pointer */
- struct blkio_group_stats_cpu __percpu *stats_cpu;
+struct blkg_rwstat {
+ struct u64_stats_sync syncp;
+ uint64_t cnt[BLKG_RWSTAT_NR];
};
-struct blkio_policy_node {
- struct list_head node;
- dev_t dev;
- /* This node belongs to max bw policy or porportional weight policy */
- enum blkio_policy_id plid;
- /* cgroup file to which this rule belongs to */
- int fileid;
-
- union {
- unsigned int weight;
- /*
- * Rate read/write in terms of bytes per second
- * Whether this rate represents read or write is determined
- * by file type "fileid".
- */
- u64 bps;
- unsigned int iops;
- } val;
+/*
+ * A blkcg_gq (blkg) is association between a block cgroup (blkcg) and a
+ * request_queue (q). This is used by blkcg policies which need to track
+ * information per blkcg - q pair.
+ *
+ * There can be multiple active blkcg policies and each has its private
+ * data on each blkg, the size of which is determined by
+ * blkcg_policy->pd_size. blkcg core allocates and frees such areas
+ * together with blkg and invokes pd_init/exit_fn() methods.
+ *
+ * Such private data must embed struct blkg_policy_data (pd) at the
+ * beginning and pd_size can't be smaller than pd.
+ */
+struct blkg_policy_data {
+ /* the blkg this per-policy data belongs to */
+ struct blkcg_gq *blkg;
+
+ /* used during policy activation */
+ struct list_head alloc_node;
};
-extern unsigned int blkcg_get_weight(struct blkio_cgroup *blkcg,
- dev_t dev);
-extern uint64_t blkcg_get_read_bps(struct blkio_cgroup *blkcg,
- dev_t dev);
-extern uint64_t blkcg_get_write_bps(struct blkio_cgroup *blkcg,
- dev_t dev);
-extern unsigned int blkcg_get_read_iops(struct blkio_cgroup *blkcg,
- dev_t dev);
-extern unsigned int blkcg_get_write_iops(struct blkio_cgroup *blkcg,
- dev_t dev);
-
-typedef void (blkio_unlink_group_fn) (void *key, struct blkio_group *blkg);
-
-typedef void (blkio_update_group_weight_fn) (void *key,
- struct blkio_group *blkg, unsigned int weight);
-typedef void (blkio_update_group_read_bps_fn) (void * key,
- struct blkio_group *blkg, u64 read_bps);
-typedef void (blkio_update_group_write_bps_fn) (void *key,
- struct blkio_group *blkg, u64 write_bps);
-typedef void (blkio_update_group_read_iops_fn) (void *key,
- struct blkio_group *blkg, unsigned int read_iops);
-typedef void (blkio_update_group_write_iops_fn) (void *key,
- struct blkio_group *blkg, unsigned int write_iops);
-
-struct blkio_policy_ops {
- blkio_unlink_group_fn *blkio_unlink_group_fn;
- blkio_update_group_weight_fn *blkio_update_group_weight_fn;
- blkio_update_group_read_bps_fn *blkio_update_group_read_bps_fn;
- blkio_update_group_write_bps_fn *blkio_update_group_write_bps_fn;
- blkio_update_group_read_iops_fn *blkio_update_group_read_iops_fn;
- blkio_update_group_write_iops_fn *blkio_update_group_write_iops_fn;
+/* association between a blk cgroup and a request queue */
+struct blkcg_gq {
+ /* Pointer to the associated request_queue */
+ struct request_queue *q;
+ struct list_head q_node;
+ struct hlist_node blkcg_node;
+ struct blkcg *blkcg;
+ /* reference count */
+ int refcnt;
+
+ struct blkg_policy_data *pd[BLKCG_MAX_POLS];
+
+ struct rcu_head rcu_head;
};
-struct blkio_policy_type {
- struct list_head list;
- struct blkio_policy_ops ops;
- enum blkio_policy_id plid;
+typedef void (blkcg_pol_init_pd_fn)(struct blkcg_gq *blkg);
+typedef void (blkcg_pol_exit_pd_fn)(struct blkcg_gq *blkg);
+typedef void (blkcg_pol_reset_pd_stats_fn)(struct blkcg_gq *blkg);
+
+struct blkcg_policy {
+ int plid;
+ /* policy specific private data size */
+ size_t pd_size;
+ /* cgroup files for the policy */
+ struct cftype *cftypes;
+
+ /* operations */
+ blkcg_pol_init_pd_fn *pd_init_fn;
+ blkcg_pol_exit_pd_fn *pd_exit_fn;
+ blkcg_pol_reset_pd_stats_fn *pd_reset_stats_fn;
};
+extern struct blkcg blkcg_root;
+
+struct blkcg *cgroup_to_blkcg(struct cgroup *cgroup);
+struct blkcg *bio_blkcg(struct bio *bio);
+struct blkcg_gq *blkg_lookup(struct blkcg *blkcg, struct request_queue *q);
+struct blkcg_gq *blkg_lookup_create(struct blkcg *blkcg,
+ struct request_queue *q);
+int blkcg_init_queue(struct request_queue *q);
+void blkcg_drain_queue(struct request_queue *q);
+void blkcg_exit_queue(struct request_queue *q);
+
/* Blkio controller policy registration */
-extern void blkio_policy_register(struct blkio_policy_type *);
-extern void blkio_policy_unregister(struct blkio_policy_type *);
+int blkcg_policy_register(struct blkcg_policy *pol);
+void blkcg_policy_unregister(struct blkcg_policy *pol);
+int blkcg_activate_policy(struct request_queue *q,
+ const struct blkcg_policy *pol);
+void blkcg_deactivate_policy(struct request_queue *q,
+ const struct blkcg_policy *pol);
+
+void blkcg_print_blkgs(struct seq_file *sf, struct blkcg *blkcg,
+ u64 (*prfill)(struct seq_file *,
+ struct blkg_policy_data *, int),
+ const struct blkcg_policy *pol, int data,
+ bool show_total);
+u64 __blkg_prfill_u64(struct seq_file *sf, struct blkg_policy_data *pd, u64 v);
+u64 __blkg_prfill_rwstat(struct seq_file *sf, struct blkg_policy_data *pd,
+ const struct blkg_rwstat *rwstat);
+u64 blkg_prfill_stat(struct seq_file *sf, struct blkg_policy_data *pd, int off);
+u64 blkg_prfill_rwstat(struct seq_file *sf, struct blkg_policy_data *pd,
+ int off);
+
+struct blkg_conf_ctx {
+ struct gendisk *disk;
+ struct blkcg_gq *blkg;
+ u64 v;
+};
+
+int blkg_conf_prep(struct blkcg *blkcg, const struct blkcg_policy *pol,
+ const char *input, struct blkg_conf_ctx *ctx);
+void blkg_conf_finish(struct blkg_conf_ctx *ctx);
+
+
+/**
+ * blkg_to_pdata - get policy private data
+ * @blkg: blkg of interest
+ * @pol: policy of interest
+ *
+ * Return pointer to private data associated with the @blkg-@pol pair.
+ */
+static inline struct blkg_policy_data *blkg_to_pd(struct blkcg_gq *blkg,
+ struct blkcg_policy *pol)
+{
+ return blkg ? blkg->pd[pol->plid] : NULL;
+}
+
+/**
+ * pdata_to_blkg - get blkg associated with policy private data
+ * @pd: policy private data of interest
+ *
+ * @pd is policy private data. Determine the blkg it's associated with.
+ */
+static inline struct blkcg_gq *pd_to_blkg(struct blkg_policy_data *pd)
+{
+ return pd ? pd->blkg : NULL;
+}
+
+/**
+ * blkg_path - format cgroup path of blkg
+ * @blkg: blkg of interest
+ * @buf: target buffer
+ * @buflen: target buffer length
+ *
+ * Format the path of the cgroup of @blkg into @buf.
+ */
+static inline int blkg_path(struct blkcg_gq *blkg, char *buf, int buflen)
+{
+ int ret;
+
+ rcu_read_lock();
+ ret = cgroup_path(blkg->blkcg->css.cgroup, buf, buflen);
+ rcu_read_unlock();
+ if (ret)
+ strncpy(buf, "<unavailable>", buflen);
+ return ret;
+}
-static inline char *blkg_path(struct blkio_group *blkg)
+/**
+ * blkg_get - get a blkg reference
+ * @blkg: blkg to get
+ *
+ * The caller should be holding queue_lock and an existing reference.
+ */
+static inline void blkg_get(struct blkcg_gq *blkg)
{
- return blkg->path;
+ lockdep_assert_held(blkg->q->queue_lock);
+ WARN_ON_ONCE(!blkg->refcnt);
+ blkg->refcnt++;
}
-#else
+void __blkg_release(struct blkcg_gq *blkg);
-struct blkio_group {
+/**
+ * blkg_put - put a blkg reference
+ * @blkg: blkg to put
+ *
+ * The caller should be holding queue_lock.
+ */
+static inline void blkg_put(struct blkcg_gq *blkg)
+{
+ lockdep_assert_held(blkg->q->queue_lock);
+ WARN_ON_ONCE(blkg->refcnt <= 0);
+ if (!--blkg->refcnt)
+ __blkg_release(blkg);
+}
+
+/**
+ * blkg_stat_add - add a value to a blkg_stat
+ * @stat: target blkg_stat
+ * @val: value to add
+ *
+ * Add @val to @stat. The caller is responsible for synchronizing calls to
+ * this function.
+ */
+static inline void blkg_stat_add(struct blkg_stat *stat, uint64_t val)
+{
+ u64_stats_update_begin(&stat->syncp);
+ stat->cnt += val;
+ u64_stats_update_end(&stat->syncp);
+}
+
+/**
+ * blkg_stat_read - read the current value of a blkg_stat
+ * @stat: blkg_stat to read
+ *
+ * Read the current value of @stat. This function can be called without
+ * synchroniztion and takes care of u64 atomicity.
+ */
+static inline uint64_t blkg_stat_read(struct blkg_stat *stat)
+{
+ unsigned int start;
+ uint64_t v;
+
+ do {
+ start = u64_stats_fetch_begin(&stat->syncp);
+ v = stat->cnt;
+ } while (u64_stats_fetch_retry(&stat->syncp, start));
+
+ return v;
+}
+
+/**
+ * blkg_stat_reset - reset a blkg_stat
+ * @stat: blkg_stat to reset
+ */
+static inline void blkg_stat_reset(struct blkg_stat *stat)
+{
+ stat->cnt = 0;
+}
+
+/**
+ * blkg_rwstat_add - add a value to a blkg_rwstat
+ * @rwstat: target blkg_rwstat
+ * @rw: mask of REQ_{WRITE|SYNC}
+ * @val: value to add
+ *
+ * Add @val to @rwstat. The counters are chosen according to @rw. The
+ * caller is responsible for synchronizing calls to this function.
+ */
+static inline void blkg_rwstat_add(struct blkg_rwstat *rwstat,
+ int rw, uint64_t val)
+{
+ u64_stats_update_begin(&rwstat->syncp);
+
+ if (rw & REQ_WRITE)
+ rwstat->cnt[BLKG_RWSTAT_WRITE] += val;
+ else
+ rwstat->cnt[BLKG_RWSTAT_READ] += val;
+ if (rw & REQ_SYNC)
+ rwstat->cnt[BLKG_RWSTAT_SYNC] += val;
+ else
+ rwstat->cnt[BLKG_RWSTAT_ASYNC] += val;
+
+ u64_stats_update_end(&rwstat->syncp);
+}
+
+/**
+ * blkg_rwstat_read - read the current values of a blkg_rwstat
+ * @rwstat: blkg_rwstat to read
+ *
+ * Read the current snapshot of @rwstat and return it as the return value.
+ * This function can be called without synchronization and takes care of
+ * u64 atomicity.
+ */
+static inline struct blkg_rwstat blkg_rwstat_read(struct blkg_rwstat *rwstat)
+{
+ unsigned int start;
+ struct blkg_rwstat tmp;
+
+ do {
+ start = u64_stats_fetch_begin(&rwstat->syncp);
+ tmp = *rwstat;
+ } while (u64_stats_fetch_retry(&rwstat->syncp, start));
+
+ return tmp;
+}
+
+/**
+ * blkg_rwstat_sum - read the total count of a blkg_rwstat
+ * @rwstat: blkg_rwstat to read
+ *
+ * Return the total count of @rwstat regardless of the IO direction. This
+ * function can be called without synchronization and takes care of u64
+ * atomicity.
+ */
+static inline uint64_t blkg_rwstat_sum(struct blkg_rwstat *rwstat)
+{
+ struct blkg_rwstat tmp = blkg_rwstat_read(rwstat);
+
+ return tmp.cnt[BLKG_RWSTAT_READ] + tmp.cnt[BLKG_RWSTAT_WRITE];
+}
+
+/**
+ * blkg_rwstat_reset - reset a blkg_rwstat
+ * @rwstat: blkg_rwstat to reset
+ */
+static inline void blkg_rwstat_reset(struct blkg_rwstat *rwstat)
+{
+ memset(rwstat->cnt, 0, sizeof(rwstat->cnt));
+}
+
+#else /* CONFIG_BLK_CGROUP */
+
+struct cgroup;
+
+struct blkg_policy_data {
};
-struct blkio_policy_type {
+struct blkcg_gq {
};
-static inline void blkio_policy_register(struct blkio_policy_type *blkiop) { }
-static inline void blkio_policy_unregister(struct blkio_policy_type *blkiop) { }
-
-static inline char *blkg_path(struct blkio_group *blkg) { return NULL; }
-
-#endif
-
-#define BLKIO_WEIGHT_MIN 10
-#define BLKIO_WEIGHT_MAX 1000
-#define BLKIO_WEIGHT_DEFAULT 500
-
-#ifdef CONFIG_DEBUG_BLK_CGROUP
-void blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg);
-void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
- unsigned long dequeue);
-void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg);
-void blkiocg_update_idle_time_stats(struct blkio_group *blkg);
-void blkiocg_set_start_empty_time(struct blkio_group *blkg);
-
-#define BLKG_FLAG_FNS(name) \
-static inline void blkio_mark_blkg_##name( \
- struct blkio_group_stats *stats) \
-{ \
- stats->flags |= (1 << BLKG_##name); \
-} \
-static inline void blkio_clear_blkg_##name( \
- struct blkio_group_stats *stats) \
-{ \
- stats->flags &= ~(1 << BLKG_##name); \
-} \
-static inline int blkio_blkg_##name(struct blkio_group_stats *stats) \
-{ \
- return (stats->flags & (1 << BLKG_##name)) != 0; \
-} \
-
-BLKG_FLAG_FNS(waiting)
-BLKG_FLAG_FNS(idling)
-BLKG_FLAG_FNS(empty)
-#undef BLKG_FLAG_FNS
-#else
-static inline void blkiocg_update_avg_queue_size_stats(
- struct blkio_group *blkg) {}
-static inline void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
- unsigned long dequeue) {}
-static inline void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg)
-{}
-static inline void blkiocg_update_idle_time_stats(struct blkio_group *blkg) {}
-static inline void blkiocg_set_start_empty_time(struct blkio_group *blkg) {}
-#endif
-
-#if defined(CONFIG_BLK_CGROUP) || defined(CONFIG_BLK_CGROUP_MODULE)
-extern struct blkio_cgroup blkio_root_cgroup;
-extern struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup);
-extern struct blkio_cgroup *task_blkio_cgroup(struct task_struct *tsk);
-extern void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
- struct blkio_group *blkg, void *key, dev_t dev,
- enum blkio_policy_id plid);
-extern int blkio_alloc_blkg_stats(struct blkio_group *blkg);
-extern int blkiocg_del_blkio_group(struct blkio_group *blkg);
-extern struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg,
- void *key);
-void blkiocg_update_timeslice_used(struct blkio_group *blkg,
- unsigned long time,
- unsigned long unaccounted_time);
-void blkiocg_update_dispatch_stats(struct blkio_group *blkg, uint64_t bytes,
- bool direction, bool sync);
-void blkiocg_update_completion_stats(struct blkio_group *blkg,
- uint64_t start_time, uint64_t io_start_time, bool direction, bool sync);
-void blkiocg_update_io_merged_stats(struct blkio_group *blkg, bool direction,
- bool sync);
-void blkiocg_update_io_add_stats(struct blkio_group *blkg,
- struct blkio_group *curr_blkg, bool direction, bool sync);
-void blkiocg_update_io_remove_stats(struct blkio_group *blkg,
- bool direction, bool sync);
-#else
-struct cgroup;
-static inline struct blkio_cgroup *
-cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; }
-static inline struct blkio_cgroup *
-task_blkio_cgroup(struct task_struct *tsk) { return NULL; }
-
-static inline void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
- struct blkio_group *blkg, void *key, dev_t dev,
- enum blkio_policy_id plid) {}
-
-static inline int blkio_alloc_blkg_stats(struct blkio_group *blkg) { return 0; }
-
-static inline int
-blkiocg_del_blkio_group(struct blkio_group *blkg) { return 0; }
-
-static inline struct blkio_group *
-blkiocg_lookup_group(struct blkio_cgroup *blkcg, void *key) { return NULL; }
-static inline void blkiocg_update_timeslice_used(struct blkio_group *blkg,
- unsigned long time,
- unsigned long unaccounted_time)
-{}
-static inline void blkiocg_update_dispatch_stats(struct blkio_group *blkg,
- uint64_t bytes, bool direction, bool sync) {}
-static inline void blkiocg_update_completion_stats(struct blkio_group *blkg,
- uint64_t start_time, uint64_t io_start_time, bool direction,
- bool sync) {}
-static inline void blkiocg_update_io_merged_stats(struct blkio_group *blkg,
- bool direction, bool sync) {}
-static inline void blkiocg_update_io_add_stats(struct blkio_group *blkg,
- struct blkio_group *curr_blkg, bool direction, bool sync) {}
-static inline void blkiocg_update_io_remove_stats(struct blkio_group *blkg,
- bool direction, bool sync) {}
-#endif
-#endif /* _BLK_CGROUP_H */
+struct blkcg_policy {
+};
+
+static inline struct blkcg *cgroup_to_blkcg(struct cgroup *cgroup) { return NULL; }
+static inline struct blkcg *bio_blkcg(struct bio *bio) { return NULL; }
+static inline struct blkcg_gq *blkg_lookup(struct blkcg *blkcg, void *key) { return NULL; }
+static inline int blkcg_init_queue(struct request_queue *q) { return 0; }
+static inline void blkcg_drain_queue(struct request_queue *q) { }
+static inline void blkcg_exit_queue(struct request_queue *q) { }
+static inline int blkcg_policy_register(struct blkcg_policy *pol) { return 0; }
+static inline void blkcg_policy_unregister(struct blkcg_policy *pol) { }
+static inline int blkcg_activate_policy(struct request_queue *q,
+ const struct blkcg_policy *pol) { return 0; }
+static inline void blkcg_deactivate_policy(struct request_queue *q,
+ const struct blkcg_policy *pol) { }
+
+static inline struct blkg_policy_data *blkg_to_pd(struct blkcg_gq *blkg,
+ struct blkcg_policy *pol) { return NULL; }
+static inline struct blkcg_gq *pd_to_blkg(struct blkg_policy_data *pd) { return NULL; }
+static inline char *blkg_path(struct blkcg_gq *blkg) { return NULL; }
+static inline void blkg_get(struct blkcg_gq *blkg) { }
+static inline void blkg_put(struct blkcg_gq *blkg) { }
+
+#endif /* CONFIG_BLK_CGROUP */
+#endif /* _BLK_CGROUP_H */
diff --git a/block/blk-core.c b/block/blk-core.c
index 1f61b74867e..3c923a7aeb5 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -29,11 +29,13 @@
#include <linux/fault-inject.h>
#include <linux/list_sort.h>
#include <linux/delay.h>
+#include <linux/ratelimit.h>
#define CREATE_TRACE_POINTS
#include <trace/events/block.h>
#include "blk.h"
+#include "blk-cgroup.h"
EXPORT_TRACEPOINT_SYMBOL_GPL(block_bio_remap);
EXPORT_TRACEPOINT_SYMBOL_GPL(block_rq_remap);
@@ -280,7 +282,7 @@ EXPORT_SYMBOL(blk_stop_queue);
*
* This function does not cancel any asynchronous activity arising
* out of elevator or throttling code. That would require elevaotor_exit()
- * and blk_throtl_exit() to be called with queue lock initialized.
+ * and blkcg_exit_queue() to be called with queue lock initialized.
*
*/
void blk_sync_queue(struct request_queue *q)
@@ -365,17 +367,23 @@ void blk_drain_queue(struct request_queue *q, bool drain_all)
spin_lock_irq(q->queue_lock);
- elv_drain_elevator(q);
- if (drain_all)
- blk_throtl_drain(q);
+ /*
+ * The caller might be trying to drain @q before its
+ * elevator is initialized.
+ */
+ if (q->elevator)
+ elv_drain_elevator(q);
+
+ blkcg_drain_queue(q);
/*
* This function might be called on a queue which failed
- * driver init after queue creation. Some drivers
- * (e.g. fd) get unhappy in such cases. Kick queue iff
- * dispatch queue has something on it.
+ * driver init after queue creation or is not yet fully
+ * active yet. Some drivers (e.g. fd and loop) get unhappy
+ * in such cases. Kick queue iff dispatch queue has
+ * something on it and @q has request_fn set.
*/
- if (!list_empty(&q->queue_head))
+ if (!list_empty(&q->queue_head) && q->request_fn)
__blk_run_queue(q);
drain |= q->rq.elvpriv;
@@ -403,6 +411,49 @@ void blk_drain_queue(struct request_queue *q, bool drain_all)
}
/**
+ * blk_queue_bypass_start - enter queue bypass mode
+ * @q: queue of interest
+ *
+ * In bypass mode, only the dispatch FIFO queue of @q is used. This
+ * function makes @q enter bypass mode and drains all requests which were
+ * throttled or issued before. On return, it's guaranteed that no request
+ * is being throttled or has ELVPRIV set and blk_queue_bypass() %true
+ * inside queue or RCU read lock.
+ */
+void blk_queue_bypass_start(struct request_queue *q)
+{
+ bool drain;
+
+ spin_lock_irq(q->queue_lock);
+ drain = !q->bypass_depth++;
+ queue_flag_set(QUEUE_FLAG_BYPASS, q);
+ spin_unlock_irq(q->queue_lock);
+
+ if (drain) {
+ blk_drain_queue(q, false);
+ /* ensure blk_queue_bypass() is %true inside RCU read lock */
+ synchronize_rcu();
+ }
+}
+EXPORT_SYMBOL_GPL(blk_queue_bypass_start);
+
+/**
+ * blk_queue_bypass_end - leave queue bypass mode
+ * @q: queue of interest
+ *
+ * Leave bypass mode and restore the normal queueing behavior.
+ */
+void blk_queue_bypass_end(struct request_queue *q)
+{
+ spin_lock_irq(q->queue_lock);
+ if (!--q->bypass_depth)
+ queue_flag_clear(QUEUE_FLAG_BYPASS, q);
+ WARN_ON_ONCE(q->bypass_depth < 0);
+ spin_unlock_irq(q->queue_lock);
+}
+EXPORT_SYMBOL_GPL(blk_queue_bypass_end);
+
+/**
* blk_cleanup_queue - shutdown a request queue
* @q: request queue to shutdown
*
@@ -418,6 +469,19 @@ void blk_cleanup_queue(struct request_queue *q)
queue_flag_set_unlocked(QUEUE_FLAG_DEAD, q);
spin_lock_irq(lock);
+
+ /*
+ * Dead queue is permanently in bypass mode till released. Note
+ * that, unlike blk_queue_bypass_start(), we aren't performing
+ * synchronize_rcu() after entering bypass mode to avoid the delay
+ * as some drivers create and destroy a lot of queues while
+ * probing. This is still safe because blk_release_queue() will be
+ * called only after the queue refcnt drops to zero and nothing,
+ * RCU or not, would be traversing the queue by then.
+ */
+ q->bypass_depth++;
+ queue_flag_set(QUEUE_FLAG_BYPASS, q);
+
queue_flag_set(QUEUE_FLAG_NOMERGES, q);
queue_flag_set(QUEUE_FLAG_NOXMERGES, q);
queue_flag_set(QUEUE_FLAG_DEAD, q);
@@ -428,13 +492,8 @@ void blk_cleanup_queue(struct request_queue *q)
spin_unlock_irq(lock);
mutex_unlock(&q->sysfs_lock);
- /*
- * Drain all requests queued before DEAD marking. The caller might
- * be trying to tear down @q before its elevator is initialized, in
- * which case we don't want to call into draining.
- */
- if (q->elevator)
- blk_drain_queue(q, true);
+ /* drain all requests queued before DEAD marking */
+ blk_drain_queue(q, true);
/* @q won't process any more request, flush async actions */
del_timer_sync(&q->backing_dev_info.laptop_mode_wb_timer);
@@ -498,14 +557,15 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id)
if (err)
goto fail_id;
- if (blk_throtl_init(q))
- goto fail_id;
-
setup_timer(&q->backing_dev_info.laptop_mode_wb_timer,
laptop_mode_timer_fn, (unsigned long) q);
setup_timer(&q->timeout, blk_rq_timed_out_timer, (unsigned long) q);
+ INIT_LIST_HEAD(&q->queue_head);
INIT_LIST_HEAD(&q->timeout_list);
INIT_LIST_HEAD(&q->icq_list);
+#ifdef CONFIG_BLK_CGROUP
+ INIT_LIST_HEAD(&q->blkg_list);
+#endif
INIT_LIST_HEAD(&q->flush_queue[0]);
INIT_LIST_HEAD(&q->flush_queue[1]);
INIT_LIST_HEAD(&q->flush_data_in_flight);
@@ -522,6 +582,18 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id)
*/
q->queue_lock = &q->__queue_lock;
+ /*
+ * A queue starts its life with bypass turned on to avoid
+ * unnecessary bypass on/off overhead and nasty surprises during
+ * init. The initial bypass will be finished at the end of
+ * blk_init_allocated_queue().
+ */
+ q->bypass_depth = 1;
+ __set_bit(QUEUE_FLAG_BYPASS, &q->queue_flags);
+
+ if (blkcg_init_queue(q))
+ goto fail_id;
+
return q;
fail_id:
@@ -614,15 +686,15 @@ blk_init_allocated_queue(struct request_queue *q, request_fn_proc *rfn,
q->sg_reserved_size = INT_MAX;
- /*
- * all done
- */
- if (!elevator_init(q, NULL)) {
- blk_queue_congestion_threshold(q);
- return q;
- }
+ /* init elevator */
+ if (elevator_init(q, NULL))
+ return NULL;
- return NULL;
+ blk_queue_congestion_threshold(q);
+
+ /* all done, end the initial bypass */
+ blk_queue_bypass_end(q);
+ return q;
}
EXPORT_SYMBOL(blk_init_allocated_queue);
@@ -648,33 +720,6 @@ static inline void blk_free_request(struct request_queue *q, struct request *rq)
mempool_free(rq, q->rq.rq_pool);
}
-static struct request *
-blk_alloc_request(struct request_queue *q, struct io_cq *icq,
- unsigned int flags, gfp_t gfp_mask)
-{
- struct request *rq = mempool_alloc(q->rq.rq_pool, gfp_mask);
-
- if (!rq)
- return NULL;
-
- blk_rq_init(q, rq);
-
- rq->cmd_flags = flags | REQ_ALLOCED;
-
- if (flags & REQ_ELVPRIV) {
- rq->elv.icq = icq;
- if (unlikely(elv_set_request(q, rq, gfp_mask))) {
- mempool_free(rq, q->rq.rq_pool);
- return NULL;
- }
- /* @rq->elv.icq holds on to io_context until @rq is freed */
- if (icq)
- get_io_context(icq->ioc);
- }
-
- return rq;
-}
-
/*
* ioc_batching returns true if the ioc is a valid batching request and
* should be given priority access to a request.
@@ -763,6 +808,22 @@ static bool blk_rq_should_init_elevator(struct bio *bio)
}
/**
+ * rq_ioc - determine io_context for request allocation
+ * @bio: request being allocated is for this bio (can be %NULL)
+ *
+ * Determine io_context to use for request allocation for @bio. May return
+ * %NULL if %current->io_context doesn't exist.
+ */
+static struct io_context *rq_ioc(struct bio *bio)
+{
+#ifdef CONFIG_BLK_CGROUP
+ if (bio && bio->bi_ioc)
+ return bio->bi_ioc;
+#endif
+ return current->io_context;
+}
+
+/**
* get_request - get a free request
* @q: request_queue to allocate request from
* @rw_flags: RW and SYNC flags
@@ -779,7 +840,7 @@ static bool blk_rq_should_init_elevator(struct bio *bio)
static struct request *get_request(struct request_queue *q, int rw_flags,
struct bio *bio, gfp_t gfp_mask)
{
- struct request *rq = NULL;
+ struct request *rq;
struct request_list *rl = &q->rq;
struct elevator_type *et;
struct io_context *ioc;
@@ -789,7 +850,7 @@ static struct request *get_request(struct request_queue *q, int rw_flags,
int may_queue;
retry:
et = q->elevator->type;
- ioc = current->io_context;
+ ioc = rq_ioc(bio);
if (unlikely(blk_queue_dead(q)))
return NULL;
@@ -808,7 +869,7 @@ retry:
*/
if (!ioc && !retried) {
spin_unlock_irq(q->queue_lock);
- create_io_context(current, gfp_mask, q->node);
+ create_io_context(gfp_mask, q->node);
spin_lock_irq(q->queue_lock);
retried = true;
goto retry;
@@ -831,7 +892,7 @@ retry:
* process is not a "batcher", and not
* exempted by the IO scheduler
*/
- goto out;
+ return NULL;
}
}
}
@@ -844,7 +905,7 @@ retry:
* allocated with any setting of ->nr_requests
*/
if (rl->count[is_sync] >= (3 * q->nr_requests / 2))
- goto out;
+ return NULL;
rl->count[is_sync]++;
rl->starved[is_sync] = 0;
@@ -859,8 +920,7 @@ retry:
* Also, lookup icq while holding queue_lock. If it doesn't exist,
* it will be created after releasing queue_lock.
*/
- if (blk_rq_should_init_elevator(bio) &&
- !test_bit(QUEUE_FLAG_ELVSWITCH, &q->queue_flags)) {
+ if (blk_rq_should_init_elevator(bio) && !blk_queue_bypass(q)) {
rw_flags |= REQ_ELVPRIV;
rl->elvpriv++;
if (et->icq_cache && ioc)
@@ -871,41 +931,36 @@ retry:
rw_flags |= REQ_IO_STAT;
spin_unlock_irq(q->queue_lock);
- /* create icq if missing */
- if ((rw_flags & REQ_ELVPRIV) && unlikely(et->icq_cache && !icq)) {
- icq = ioc_create_icq(q, gfp_mask);
- if (!icq)
- goto fail_icq;
- }
-
- rq = blk_alloc_request(q, icq, rw_flags, gfp_mask);
+ /* allocate and init request */
+ rq = mempool_alloc(q->rq.rq_pool, gfp_mask);
+ if (!rq)
+ goto fail_alloc;
-fail_icq:
- if (unlikely(!rq)) {
- /*
- * Allocation failed presumably due to memory. Undo anything
- * we might have messed up.
- *
- * Allocating task should really be put onto the front of the
- * wait queue, but this is pretty rare.
- */
- spin_lock_irq(q->queue_lock);
- freed_request(q, rw_flags);
+ blk_rq_init(q, rq);
+ rq->cmd_flags = rw_flags | REQ_ALLOCED;
+
+ /* init elvpriv */
+ if (rw_flags & REQ_ELVPRIV) {
+ if (unlikely(et->icq_cache && !icq)) {
+ create_io_context(gfp_mask, q->node);
+ ioc = rq_ioc(bio);
+ if (!ioc)
+ goto fail_elvpriv;
+
+ icq = ioc_create_icq(ioc, q, gfp_mask);
+ if (!icq)
+ goto fail_elvpriv;
+ }
- /*
- * in the very unlikely event that allocation failed and no
- * requests for this direction was pending, mark us starved
- * so that freeing of a request in the other direction will
- * notice us. another possible fix would be to split the
- * rq mempool into READ and WRITE
- */
-rq_starved:
- if (unlikely(rl->count[is_sync] == 0))
- rl->starved[is_sync] = 1;
+ rq->elv.icq = icq;
+ if (unlikely(elv_set_request(q, rq, bio, gfp_mask)))
+ goto fail_elvpriv;
- goto out;
+ /* @rq->elv.icq holds io_context until @rq is freed */
+ if (icq)
+ get_io_context(icq->ioc);
}
-
+out:
/*
* ioc may be NULL here, and ioc_batching will be false. That's
* OK, if the queue is under the request limit then requests need
@@ -916,8 +971,48 @@ rq_starved:
ioc->nr_batch_requests--;
trace_block_getrq(q, bio, rw_flags & 1);
-out:
return rq;
+
+fail_elvpriv:
+ /*
+ * elvpriv init failed. ioc, icq and elvpriv aren't mempool backed
+ * and may fail indefinitely under memory pressure and thus
+ * shouldn't stall IO. Treat this request as !elvpriv. This will
+ * disturb iosched and blkcg but weird is bettern than dead.
+ */
+ printk_ratelimited(KERN_WARNING "%s: request aux data allocation failed, iosched may be disturbed\n",
+ dev_name(q->backing_dev_info.dev));
+
+ rq->cmd_flags &= ~REQ_ELVPRIV;
+ rq->elv.icq = NULL;
+
+ spin_lock_irq(q->queue_lock);
+ rl->elvpriv--;
+ spin_unlock_irq(q->queue_lock);
+ goto out;
+
+fail_alloc:
+ /*
+ * Allocation failed presumably due to memory. Undo anything we
+ * might have messed up.
+ *
+ * Allocating task should really be put onto the front of the wait
+ * queue, but this is pretty rare.
+ */
+ spin_lock_irq(q->queue_lock);
+ freed_request(q, rw_flags);
+
+ /*
+ * in the very unlikely event that allocation failed and no
+ * requests for this direction was pending, mark us starved so that
+ * freeing of a request in the other direction will notice
+ * us. another possible fix would be to split the rq mempool into
+ * READ and WRITE
+ */
+rq_starved:
+ if (unlikely(rl->count[is_sync] == 0))
+ rl->starved[is_sync] = 1;
+ return NULL;
}
/**
@@ -961,7 +1056,7 @@ static struct request *get_request_wait(struct request_queue *q, int rw_flags,
* up to a big batch of them for a small period time.
* See ioc_batching, ioc_set_batching
*/
- create_io_context(current, GFP_NOIO, q->node);
+ create_io_context(GFP_NOIO, q->node);
ioc_set_batching(q, current->io_context);
spin_lock_irq(q->queue_lock);
diff --git a/block/blk-ioc.c b/block/blk-ioc.c
index fb95dd2f889..1e2d53b0485 100644
--- a/block/blk-ioc.c
+++ b/block/blk-ioc.c
@@ -155,20 +155,20 @@ void put_io_context(struct io_context *ioc)
}
EXPORT_SYMBOL(put_io_context);
-/* Called by the exiting task */
-void exit_io_context(struct task_struct *task)
+/**
+ * put_io_context_active - put active reference on ioc
+ * @ioc: ioc of interest
+ *
+ * Undo get_io_context_active(). If active reference reaches zero after
+ * put, @ioc can never issue further IOs and ioscheds are notified.
+ */
+void put_io_context_active(struct io_context *ioc)
{
- struct io_context *ioc;
- struct io_cq *icq;
struct hlist_node *n;
unsigned long flags;
+ struct io_cq *icq;
- task_lock(task);
- ioc = task->io_context;
- task->io_context = NULL;
- task_unlock(task);
-
- if (!atomic_dec_and_test(&ioc->nr_tasks)) {
+ if (!atomic_dec_and_test(&ioc->active_ref)) {
put_io_context(ioc);
return;
}
@@ -197,6 +197,20 @@ retry:
put_io_context(ioc);
}
+/* Called by the exiting task */
+void exit_io_context(struct task_struct *task)
+{
+ struct io_context *ioc;
+
+ task_lock(task);
+ ioc = task->io_context;
+ task->io_context = NULL;
+ task_unlock(task);
+
+ atomic_dec(&ioc->nr_tasks);
+ put_io_context_active(ioc);
+}
+
/**
* ioc_clear_queue - break any ioc association with the specified queue
* @q: request_queue being cleared
@@ -218,19 +232,18 @@ void ioc_clear_queue(struct request_queue *q)
}
}
-void create_io_context_slowpath(struct task_struct *task, gfp_t gfp_flags,
- int node)
+int create_task_io_context(struct task_struct *task, gfp_t gfp_flags, int node)
{
struct io_context *ioc;
ioc = kmem_cache_alloc_node(iocontext_cachep, gfp_flags | __GFP_ZERO,
node);
if (unlikely(!ioc))
- return;
+ return -ENOMEM;
/* initialize */
atomic_long_set(&ioc->refcount, 1);
- atomic_set(&ioc->nr_tasks, 1);
+ atomic_set(&ioc->active_ref, 1);
spin_lock_init(&ioc->lock);
INIT_RADIX_TREE(&ioc->icq_tree, GFP_ATOMIC | __GFP_HIGH);
INIT_HLIST_HEAD(&ioc->icq_list);
@@ -250,6 +263,8 @@ void create_io_context_slowpath(struct task_struct *task, gfp_t gfp_flags,
else
kmem_cache_free(iocontext_cachep, ioc);
task_unlock(task);
+
+ return 0;
}
/**
@@ -281,7 +296,7 @@ struct io_context *get_task_io_context(struct task_struct *task,
return ioc;
}
task_unlock(task);
- } while (create_io_context(task, gfp_flags, node));
+ } while (!create_task_io_context(task, gfp_flags, node));
return NULL;
}
@@ -325,26 +340,23 @@ EXPORT_SYMBOL(ioc_lookup_icq);
/**
* ioc_create_icq - create and link io_cq
+ * @ioc: io_context of interest
* @q: request_queue of interest
* @gfp_mask: allocation mask
*
- * Make sure io_cq linking %current->io_context and @q exists. If either
- * io_context and/or icq don't exist, they will be created using @gfp_mask.
+ * Make sure io_cq linking @ioc and @q exists. If icq doesn't exist, they
+ * will be created using @gfp_mask.
*
* The caller is responsible for ensuring @ioc won't go away and @q is
* alive and will stay alive until this function returns.
*/
-struct io_cq *ioc_create_icq(struct request_queue *q, gfp_t gfp_mask)
+struct io_cq *ioc_create_icq(struct io_context *ioc, struct request_queue *q,
+ gfp_t gfp_mask)
{
struct elevator_type *et = q->elevator->type;
- struct io_context *ioc;
struct io_cq *icq;
/* allocate stuff */
- ioc = create_io_context(current, gfp_mask, q->node);
- if (!ioc)
- return NULL;
-
icq = kmem_cache_alloc_node(et->icq_cache, gfp_mask | __GFP_ZERO,
q->node);
if (!icq)
@@ -382,74 +394,6 @@ struct io_cq *ioc_create_icq(struct request_queue *q, gfp_t gfp_mask)
return icq;
}
-void ioc_set_icq_flags(struct io_context *ioc, unsigned int flags)
-{
- struct io_cq *icq;
- struct hlist_node *n;
-
- hlist_for_each_entry(icq, n, &ioc->icq_list, ioc_node)
- icq->flags |= flags;
-}
-
-/**
- * ioc_ioprio_changed - notify ioprio change
- * @ioc: io_context of interest
- * @ioprio: new ioprio
- *
- * @ioc's ioprio has changed to @ioprio. Set %ICQ_IOPRIO_CHANGED for all
- * icq's. iosched is responsible for checking the bit and applying it on
- * request issue path.
- */
-void ioc_ioprio_changed(struct io_context *ioc, int ioprio)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&ioc->lock, flags);
- ioc->ioprio = ioprio;
- ioc_set_icq_flags(ioc, ICQ_IOPRIO_CHANGED);
- spin_unlock_irqrestore(&ioc->lock, flags);
-}
-
-/**
- * ioc_cgroup_changed - notify cgroup change
- * @ioc: io_context of interest
- *
- * @ioc's cgroup has changed. Set %ICQ_CGROUP_CHANGED for all icq's.
- * iosched is responsible for checking the bit and applying it on request
- * issue path.
- */
-void ioc_cgroup_changed(struct io_context *ioc)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&ioc->lock, flags);
- ioc_set_icq_flags(ioc, ICQ_CGROUP_CHANGED);
- spin_unlock_irqrestore(&ioc->lock, flags);
-}
-EXPORT_SYMBOL(ioc_cgroup_changed);
-
-/**
- * icq_get_changed - fetch and clear icq changed mask
- * @icq: icq of interest
- *
- * Fetch and clear ICQ_*_CHANGED bits from @icq. Grabs and releases
- * @icq->ioc->lock.
- */
-unsigned icq_get_changed(struct io_cq *icq)
-{
- unsigned int changed = 0;
- unsigned long flags;
-
- if (unlikely(icq->flags & ICQ_CHANGED_MASK)) {
- spin_lock_irqsave(&icq->ioc->lock, flags);
- changed = icq->flags & ICQ_CHANGED_MASK;
- icq->flags &= ~ICQ_CHANGED_MASK;
- spin_unlock_irqrestore(&icq->ioc->lock, flags);
- }
- return changed;
-}
-EXPORT_SYMBOL(icq_get_changed);
-
static int __init blk_ioc_init(void)
{
iocontext_cachep = kmem_cache_create("blkdev_ioc",
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index cf150011d80..aa41b47c22d 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -9,6 +9,7 @@
#include <linux/blktrace_api.h>
#include "blk.h"
+#include "blk-cgroup.h"
struct queue_sysfs_entry {
struct attribute attr;
@@ -479,6 +480,8 @@ static void blk_release_queue(struct kobject *kobj)
blk_sync_queue(q);
+ blkcg_exit_queue(q);
+
if (q->elevator) {
spin_lock_irq(q->queue_lock);
ioc_clear_queue(q);
@@ -486,15 +489,12 @@ static void blk_release_queue(struct kobject *kobj)
elevator_exit(q->elevator);
}
- blk_throtl_exit(q);
-
if (rl->rq_pool)
mempool_destroy(rl->rq_pool);
if (q->queue_tags)
__blk_queue_free_tags(q);
- blk_throtl_release(q);
blk_trace_shutdown(q);
bdi_destroy(&q->backing_dev_info);
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index f2ddb94626b..5b065951204 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -21,6 +21,8 @@ static int throtl_quantum = 32;
/* Throttling is performed over 100ms slice and after that slice is renewed */
static unsigned long throtl_slice = HZ/10; /* 100 ms */
+static struct blkcg_policy blkcg_policy_throtl;
+
/* A workqueue to queue throttle related work */
static struct workqueue_struct *kthrotld_workqueue;
static void throtl_schedule_delayed_work(struct throtl_data *td,
@@ -38,9 +40,17 @@ struct throtl_rb_root {
#define rb_entry_tg(node) rb_entry((node), struct throtl_grp, rb_node)
+/* Per-cpu group stats */
+struct tg_stats_cpu {
+ /* total bytes transferred */
+ struct blkg_rwstat service_bytes;
+ /* total IOs serviced, post merge */
+ struct blkg_rwstat serviced;
+};
+
struct throtl_grp {
- /* List of throtl groups on the request queue*/
- struct hlist_node tg_node;
+ /* must be the first member */
+ struct blkg_policy_data pd;
/* active throtl group service_tree member */
struct rb_node rb_node;
@@ -52,8 +62,6 @@ struct throtl_grp {
*/
unsigned long disptime;
- struct blkio_group blkg;
- atomic_t ref;
unsigned int flags;
/* Two lists for READ and WRITE */
@@ -80,18 +88,18 @@ struct throtl_grp {
/* Some throttle limits got updated for the group */
int limits_changed;
- struct rcu_head rcu_head;
+ /* Per cpu stats pointer */
+ struct tg_stats_cpu __percpu *stats_cpu;
+
+ /* List of tgs waiting for per cpu stats memory to be allocated */
+ struct list_head stats_alloc_node;
};
struct throtl_data
{
- /* List of throtl groups */
- struct hlist_head tg_list;
-
/* service tree for active throtl groups */
struct throtl_rb_root tg_service_tree;
- struct throtl_grp *root_tg;
struct request_queue *queue;
/* Total Number of queued bios on READ and WRITE lists */
@@ -108,6 +116,33 @@ struct throtl_data
int limits_changed;
};
+/* list and work item to allocate percpu group stats */
+static DEFINE_SPINLOCK(tg_stats_alloc_lock);
+static LIST_HEAD(tg_stats_alloc_list);
+
+static void tg_stats_alloc_fn(struct work_struct *);
+static DECLARE_DELAYED_WORK(tg_stats_alloc_work, tg_stats_alloc_fn);
+
+static inline struct throtl_grp *pd_to_tg(struct blkg_policy_data *pd)
+{
+ return pd ? container_of(pd, struct throtl_grp, pd) : NULL;
+}
+
+static inline struct throtl_grp *blkg_to_tg(struct blkcg_gq *blkg)
+{
+ return pd_to_tg(blkg_to_pd(blkg, &blkcg_policy_throtl));
+}
+
+static inline struct blkcg_gq *tg_to_blkg(struct throtl_grp *tg)
+{
+ return pd_to_blkg(&tg->pd);
+}
+
+static inline struct throtl_grp *td_root_tg(struct throtl_data *td)
+{
+ return blkg_to_tg(td->queue->root_blkg);
+}
+
enum tg_state_flags {
THROTL_TG_FLAG_on_rr = 0, /* on round-robin busy list */
};
@@ -128,244 +163,150 @@ static inline int throtl_tg_##name(const struct throtl_grp *tg) \
THROTL_TG_FNS(on_rr);
-#define throtl_log_tg(td, tg, fmt, args...) \
- blk_add_trace_msg((td)->queue, "throtl %s " fmt, \
- blkg_path(&(tg)->blkg), ##args); \
+#define throtl_log_tg(td, tg, fmt, args...) do { \
+ char __pbuf[128]; \
+ \
+ blkg_path(tg_to_blkg(tg), __pbuf, sizeof(__pbuf)); \
+ blk_add_trace_msg((td)->queue, "throtl %s " fmt, __pbuf, ##args); \
+} while (0)
#define throtl_log(td, fmt, args...) \
blk_add_trace_msg((td)->queue, "throtl " fmt, ##args)
-static inline struct throtl_grp *tg_of_blkg(struct blkio_group *blkg)
-{
- if (blkg)
- return container_of(blkg, struct throtl_grp, blkg);
-
- return NULL;
-}
-
static inline unsigned int total_nr_queued(struct throtl_data *td)
{
return td->nr_queued[0] + td->nr_queued[1];
}
-static inline struct throtl_grp *throtl_ref_get_tg(struct throtl_grp *tg)
-{
- atomic_inc(&tg->ref);
- return tg;
-}
-
-static void throtl_free_tg(struct rcu_head *head)
+/*
+ * Worker for allocating per cpu stat for tgs. This is scheduled on the
+ * system_nrt_wq once there are some groups on the alloc_list waiting for
+ * allocation.
+ */
+static void tg_stats_alloc_fn(struct work_struct *work)
{
- struct throtl_grp *tg;
+ static struct tg_stats_cpu *stats_cpu; /* this fn is non-reentrant */
+ struct delayed_work *dwork = to_delayed_work(work);
+ bool empty = false;
+
+alloc_stats:
+ if (!stats_cpu) {
+ stats_cpu = alloc_percpu(struct tg_stats_cpu);
+ if (!stats_cpu) {
+ /* allocation failed, try again after some time */
+ queue_delayed_work(system_nrt_wq, dwork,
+ msecs_to_jiffies(10));
+ return;
+ }
+ }
- tg = container_of(head, struct throtl_grp, rcu_head);
- free_percpu(tg->blkg.stats_cpu);
- kfree(tg);
-}
+ spin_lock_irq(&tg_stats_alloc_lock);
-static void throtl_put_tg(struct throtl_grp *tg)
-{
- BUG_ON(atomic_read(&tg->ref) <= 0);
- if (!atomic_dec_and_test(&tg->ref))
- return;
+ if (!list_empty(&tg_stats_alloc_list)) {
+ struct throtl_grp *tg = list_first_entry(&tg_stats_alloc_list,
+ struct throtl_grp,
+ stats_alloc_node);
+ swap(tg->stats_cpu, stats_cpu);
+ list_del_init(&tg->stats_alloc_node);
+ }
- /*
- * A group is freed in rcu manner. But having an rcu lock does not
- * mean that one can access all the fields of blkg and assume these
- * are valid. For example, don't try to follow throtl_data and
- * request queue links.
- *
- * Having a reference to blkg under an rcu allows acess to only
- * values local to groups like group stats and group rate limits
- */
- call_rcu(&tg->rcu_head, throtl_free_tg);
+ empty = list_empty(&tg_stats_alloc_list);
+ spin_unlock_irq(&tg_stats_alloc_lock);
+ if (!empty)
+ goto alloc_stats;
}
-static void throtl_init_group(struct throtl_grp *tg)
+static void throtl_pd_init(struct blkcg_gq *blkg)
{
- INIT_HLIST_NODE(&tg->tg_node);
+ struct throtl_grp *tg = blkg_to_tg(blkg);
+ unsigned long flags;
+
RB_CLEAR_NODE(&tg->rb_node);
bio_list_init(&tg->bio_lists[0]);
bio_list_init(&tg->bio_lists[1]);
tg->limits_changed = false;
- /* Practically unlimited BW */
- tg->bps[0] = tg->bps[1] = -1;
- tg->iops[0] = tg->iops[1] = -1;
+ tg->bps[READ] = -1;
+ tg->bps[WRITE] = -1;
+ tg->iops[READ] = -1;
+ tg->iops[WRITE] = -1;
/*
- * Take the initial reference that will be released on destroy
- * This can be thought of a joint reference by cgroup and
- * request queue which will be dropped by either request queue
- * exit or cgroup deletion path depending on who is exiting first.
+ * Ugh... We need to perform per-cpu allocation for tg->stats_cpu
+ * but percpu allocator can't be called from IO path. Queue tg on
+ * tg_stats_alloc_list and allocate from work item.
*/
- atomic_set(&tg->ref, 1);
+ spin_lock_irqsave(&tg_stats_alloc_lock, flags);
+ list_add(&tg->stats_alloc_node, &tg_stats_alloc_list);
+ queue_delayed_work(system_nrt_wq, &tg_stats_alloc_work, 0);
+ spin_unlock_irqrestore(&tg_stats_alloc_lock, flags);
}
-/* Should be called with rcu read lock held (needed for blkcg) */
-static void
-throtl_add_group_to_td_list(struct throtl_data *td, struct throtl_grp *tg)
+static void throtl_pd_exit(struct blkcg_gq *blkg)
{
- hlist_add_head(&tg->tg_node, &td->tg_list);
- td->nr_undestroyed_grps++;
-}
-
-static void
-__throtl_tg_fill_dev_details(struct throtl_data *td, struct throtl_grp *tg)
-{
- struct backing_dev_info *bdi = &td->queue->backing_dev_info;
- unsigned int major, minor;
-
- if (!tg || tg->blkg.dev)
- return;
-
- /*
- * Fill in device details for a group which might not have been
- * filled at group creation time as queue was being instantiated
- * and driver had not attached a device yet
- */
- if (bdi->dev && dev_name(bdi->dev)) {
- sscanf(dev_name(bdi->dev), "%u:%u", &major, &minor);
- tg->blkg.dev = MKDEV(major, minor);
- }
-}
-
-/*
- * Should be called with without queue lock held. Here queue lock will be
- * taken rarely. It will be taken only once during life time of a group
- * if need be
- */
-static void
-throtl_tg_fill_dev_details(struct throtl_data *td, struct throtl_grp *tg)
-{
- if (!tg || tg->blkg.dev)
- return;
-
- spin_lock_irq(td->queue->queue_lock);
- __throtl_tg_fill_dev_details(td, tg);
- spin_unlock_irq(td->queue->queue_lock);
-}
-
-static void throtl_init_add_tg_lists(struct throtl_data *td,
- struct throtl_grp *tg, struct blkio_cgroup *blkcg)
-{
- __throtl_tg_fill_dev_details(td, tg);
-
- /* Add group onto cgroup list */
- blkiocg_add_blkio_group(blkcg, &tg->blkg, (void *)td,
- tg->blkg.dev, BLKIO_POLICY_THROTL);
+ struct throtl_grp *tg = blkg_to_tg(blkg);
+ unsigned long flags;
- tg->bps[READ] = blkcg_get_read_bps(blkcg, tg->blkg.dev);
- tg->bps[WRITE] = blkcg_get_write_bps(blkcg, tg->blkg.dev);
- tg->iops[READ] = blkcg_get_read_iops(blkcg, tg->blkg.dev);
- tg->iops[WRITE] = blkcg_get_write_iops(blkcg, tg->blkg.dev);
+ spin_lock_irqsave(&tg_stats_alloc_lock, flags);
+ list_del_init(&tg->stats_alloc_node);
+ spin_unlock_irqrestore(&tg_stats_alloc_lock, flags);
- throtl_add_group_to_td_list(td, tg);
+ free_percpu(tg->stats_cpu);
}
-/* Should be called without queue lock and outside of rcu period */
-static struct throtl_grp *throtl_alloc_tg(struct throtl_data *td)
+static void throtl_pd_reset_stats(struct blkcg_gq *blkg)
{
- struct throtl_grp *tg = NULL;
- int ret;
+ struct throtl_grp *tg = blkg_to_tg(blkg);
+ int cpu;
- tg = kzalloc_node(sizeof(*tg), GFP_ATOMIC, td->queue->node);
- if (!tg)
- return NULL;
+ if (tg->stats_cpu == NULL)
+ return;
- ret = blkio_alloc_blkg_stats(&tg->blkg);
+ for_each_possible_cpu(cpu) {
+ struct tg_stats_cpu *sc = per_cpu_ptr(tg->stats_cpu, cpu);
- if (ret) {
- kfree(tg);
- return NULL;
+ blkg_rwstat_reset(&sc->service_bytes);
+ blkg_rwstat_reset(&sc->serviced);
}
-
- throtl_init_group(tg);
- return tg;
}
-static struct
-throtl_grp *throtl_find_tg(struct throtl_data *td, struct blkio_cgroup *blkcg)
+static struct throtl_grp *throtl_lookup_tg(struct throtl_data *td,
+ struct blkcg *blkcg)
{
- struct throtl_grp *tg = NULL;
- void *key = td;
-
/*
- * This is the common case when there are no blkio cgroups.
- * Avoid lookup in this case
- */
- if (blkcg == &blkio_root_cgroup)
- tg = td->root_tg;
- else
- tg = tg_of_blkg(blkiocg_lookup_group(blkcg, key));
+ * This is the common case when there are no blkcgs. Avoid lookup
+ * in this case
+ */
+ if (blkcg == &blkcg_root)
+ return td_root_tg(td);
- __throtl_tg_fill_dev_details(td, tg);
- return tg;
+ return blkg_to_tg(blkg_lookup(blkcg, td->queue));
}
-static struct throtl_grp * throtl_get_tg(struct throtl_data *td)
+static struct throtl_grp *throtl_lookup_create_tg(struct throtl_data *td,
+ struct blkcg *blkcg)
{
- struct throtl_grp *tg = NULL, *__tg = NULL;
- struct blkio_cgroup *blkcg;
struct request_queue *q = td->queue;
-
- /* no throttling for dead queue */
- if (unlikely(blk_queue_dead(q)))
- return NULL;
-
- rcu_read_lock();
- blkcg = task_blkio_cgroup(current);
- tg = throtl_find_tg(td, blkcg);
- if (tg) {
- rcu_read_unlock();
- return tg;
- }
-
- /*
- * Need to allocate a group. Allocation of group also needs allocation
- * of per cpu stats which in-turn takes a mutex() and can block. Hence
- * we need to drop rcu lock and queue_lock before we call alloc.
- */
- rcu_read_unlock();
- spin_unlock_irq(q->queue_lock);
-
- tg = throtl_alloc_tg(td);
-
- /* Group allocated and queue is still alive. take the lock */
- spin_lock_irq(q->queue_lock);
-
- /* Make sure @q is still alive */
- if (unlikely(blk_queue_dead(q))) {
- kfree(tg);
- return NULL;
- }
-
- /*
- * Initialize the new group. After sleeping, read the blkcg again.
- */
- rcu_read_lock();
- blkcg = task_blkio_cgroup(current);
+ struct throtl_grp *tg = NULL;
/*
- * If some other thread already allocated the group while we were
- * not holding queue lock, free up the group
+ * This is the common case when there are no blkcgs. Avoid lookup
+ * in this case
*/
- __tg = throtl_find_tg(td, blkcg);
-
- if (__tg) {
- kfree(tg);
- rcu_read_unlock();
- return __tg;
- }
-
- /* Group allocation failed. Account the IO to root group */
- if (!tg) {
- tg = td->root_tg;
- return tg;
+ if (blkcg == &blkcg_root) {
+ tg = td_root_tg(td);
+ } else {
+ struct blkcg_gq *blkg;
+
+ blkg = blkg_lookup_create(blkcg, q);
+
+ /* if %NULL and @q is alive, fall back to root_tg */
+ if (!IS_ERR(blkg))
+ tg = blkg_to_tg(blkg);
+ else if (!blk_queue_dead(q))
+ tg = td_root_tg(td);
}
- throtl_init_add_tg_lists(td, tg, blkcg);
- rcu_read_unlock();
return tg;
}
@@ -734,16 +675,41 @@ static bool tg_may_dispatch(struct throtl_data *td, struct throtl_grp *tg,
return 0;
}
+static void throtl_update_dispatch_stats(struct blkcg_gq *blkg, u64 bytes,
+ int rw)
+{
+ struct throtl_grp *tg = blkg_to_tg(blkg);
+ struct tg_stats_cpu *stats_cpu;
+ unsigned long flags;
+
+ /* If per cpu stats are not allocated yet, don't do any accounting. */
+ if (tg->stats_cpu == NULL)
+ return;
+
+ /*
+ * Disabling interrupts to provide mutual exclusion between two
+ * writes on same cpu. It probably is not needed for 64bit. Not
+ * optimizing that case yet.
+ */
+ local_irq_save(flags);
+
+ stats_cpu = this_cpu_ptr(tg->stats_cpu);
+
+ blkg_rwstat_add(&stats_cpu->serviced, rw, 1);
+ blkg_rwstat_add(&stats_cpu->service_bytes, rw, bytes);
+
+ local_irq_restore(flags);
+}
+
static void throtl_charge_bio(struct throtl_grp *tg, struct bio *bio)
{
bool rw = bio_data_dir(bio);
- bool sync = rw_is_sync(bio->bi_rw);
/* Charge the bio to the group */
tg->bytes_disp[rw] += bio->bi_size;
tg->io_disp[rw]++;
- blkiocg_update_dispatch_stats(&tg->blkg, bio->bi_size, rw, sync);
+ throtl_update_dispatch_stats(tg_to_blkg(tg), bio->bi_size, bio->bi_rw);
}
static void throtl_add_bio_tg(struct throtl_data *td, struct throtl_grp *tg,
@@ -753,7 +719,7 @@ static void throtl_add_bio_tg(struct throtl_data *td, struct throtl_grp *tg,
bio_list_add(&tg->bio_lists[rw], bio);
/* Take a bio reference on tg */
- throtl_ref_get_tg(tg);
+ blkg_get(tg_to_blkg(tg));
tg->nr_queued[rw]++;
td->nr_queued[rw]++;
throtl_enqueue_tg(td, tg);
@@ -786,8 +752,8 @@ static void tg_dispatch_one_bio(struct throtl_data *td, struct throtl_grp *tg,
bio = bio_list_pop(&tg->bio_lists[rw]);
tg->nr_queued[rw]--;
- /* Drop bio reference on tg */
- throtl_put_tg(tg);
+ /* Drop bio reference on blkg */
+ blkg_put(tg_to_blkg(tg));
BUG_ON(td->nr_queued[rw] <= 0);
td->nr_queued[rw]--;
@@ -865,8 +831,8 @@ static int throtl_select_dispatch(struct throtl_data *td, struct bio_list *bl)
static void throtl_process_limit_change(struct throtl_data *td)
{
- struct throtl_grp *tg;
- struct hlist_node *pos, *n;
+ struct request_queue *q = td->queue;
+ struct blkcg_gq *blkg, *n;
if (!td->limits_changed)
return;
@@ -875,7 +841,9 @@ static void throtl_process_limit_change(struct throtl_data *td)
throtl_log(td, "limits changed");
- hlist_for_each_entry_safe(tg, pos, n, &td->tg_list, tg_node) {
+ list_for_each_entry_safe(blkg, n, &q->blkg_list, q_node) {
+ struct throtl_grp *tg = blkg_to_tg(blkg);
+
if (!tg->limits_changed)
continue;
@@ -973,120 +941,159 @@ throtl_schedule_delayed_work(struct throtl_data *td, unsigned long delay)
}
}
-static void
-throtl_destroy_tg(struct throtl_data *td, struct throtl_grp *tg)
+static u64 tg_prfill_cpu_rwstat(struct seq_file *sf,
+ struct blkg_policy_data *pd, int off)
{
- /* Something wrong if we are trying to remove same group twice */
- BUG_ON(hlist_unhashed(&tg->tg_node));
+ struct throtl_grp *tg = pd_to_tg(pd);
+ struct blkg_rwstat rwstat = { }, tmp;
+ int i, cpu;
- hlist_del_init(&tg->tg_node);
+ for_each_possible_cpu(cpu) {
+ struct tg_stats_cpu *sc = per_cpu_ptr(tg->stats_cpu, cpu);
- /*
- * Put the reference taken at the time of creation so that when all
- * queues are gone, group can be destroyed.
- */
- throtl_put_tg(tg);
- td->nr_undestroyed_grps--;
+ tmp = blkg_rwstat_read((void *)sc + off);
+ for (i = 0; i < BLKG_RWSTAT_NR; i++)
+ rwstat.cnt[i] += tmp.cnt[i];
+ }
+
+ return __blkg_prfill_rwstat(sf, pd, &rwstat);
}
-static void throtl_release_tgs(struct throtl_data *td)
+static int tg_print_cpu_rwstat(struct cgroup *cgrp, struct cftype *cft,
+ struct seq_file *sf)
{
- struct hlist_node *pos, *n;
- struct throtl_grp *tg;
+ struct blkcg *blkcg = cgroup_to_blkcg(cgrp);
- hlist_for_each_entry_safe(tg, pos, n, &td->tg_list, tg_node) {
- /*
- * If cgroup removal path got to blk_group first and removed
- * it from cgroup list, then it will take care of destroying
- * cfqg also.
- */
- if (!blkiocg_del_blkio_group(&tg->blkg))
- throtl_destroy_tg(td, tg);
- }
+ blkcg_print_blkgs(sf, blkcg, tg_prfill_cpu_rwstat, &blkcg_policy_throtl,
+ cft->private, true);
+ return 0;
}
-/*
- * Blk cgroup controller notification saying that blkio_group object is being
- * delinked as associated cgroup object is going away. That also means that
- * no new IO will come in this group. So get rid of this group as soon as
- * any pending IO in the group is finished.
- *
- * This function is called under rcu_read_lock(). key is the rcu protected
- * pointer. That means "key" is a valid throtl_data pointer as long as we are
- * rcu read lock.
- *
- * "key" was fetched from blkio_group under blkio_cgroup->lock. That means
- * it should not be NULL as even if queue was going away, cgroup deltion
- * path got to it first.
- */
-void throtl_unlink_blkio_group(void *key, struct blkio_group *blkg)
+static u64 tg_prfill_conf_u64(struct seq_file *sf, struct blkg_policy_data *pd,
+ int off)
{
- unsigned long flags;
- struct throtl_data *td = key;
+ struct throtl_grp *tg = pd_to_tg(pd);
+ u64 v = *(u64 *)((void *)tg + off);
- spin_lock_irqsave(td->queue->queue_lock, flags);
- throtl_destroy_tg(td, tg_of_blkg(blkg));
- spin_unlock_irqrestore(td->queue->queue_lock, flags);
+ if (v == -1)
+ return 0;
+ return __blkg_prfill_u64(sf, pd, v);
}
-static void throtl_update_blkio_group_common(struct throtl_data *td,
- struct throtl_grp *tg)
+static u64 tg_prfill_conf_uint(struct seq_file *sf, struct blkg_policy_data *pd,
+ int off)
{
- xchg(&tg->limits_changed, true);
- xchg(&td->limits_changed, true);
- /* Schedule a work now to process the limit change */
- throtl_schedule_delayed_work(td, 0);
+ struct throtl_grp *tg = pd_to_tg(pd);
+ unsigned int v = *(unsigned int *)((void *)tg + off);
+
+ if (v == -1)
+ return 0;
+ return __blkg_prfill_u64(sf, pd, v);
}
-/*
- * For all update functions, key should be a valid pointer because these
- * update functions are called under blkcg_lock, that means, blkg is
- * valid and in turn key is valid. queue exit path can not race because
- * of blkcg_lock
- *
- * Can not take queue lock in update functions as queue lock under blkcg_lock
- * is not allowed. Under other paths we take blkcg_lock under queue_lock.
- */
-static void throtl_update_blkio_group_read_bps(void *key,
- struct blkio_group *blkg, u64 read_bps)
+static int tg_print_conf_u64(struct cgroup *cgrp, struct cftype *cft,
+ struct seq_file *sf)
{
- struct throtl_data *td = key;
- struct throtl_grp *tg = tg_of_blkg(blkg);
-
- tg->bps[READ] = read_bps;
- throtl_update_blkio_group_common(td, tg);
+ blkcg_print_blkgs(sf, cgroup_to_blkcg(cgrp), tg_prfill_conf_u64,
+ &blkcg_policy_throtl, cft->private, false);
+ return 0;
}
-static void throtl_update_blkio_group_write_bps(void *key,
- struct blkio_group *blkg, u64 write_bps)
+static int tg_print_conf_uint(struct cgroup *cgrp, struct cftype *cft,
+ struct seq_file *sf)
{
- struct throtl_data *td = key;
- struct throtl_grp *tg = tg_of_blkg(blkg);
-
- tg->bps[WRITE] = write_bps;
- throtl_update_blkio_group_common(td, tg);
+ blkcg_print_blkgs(sf, cgroup_to_blkcg(cgrp), tg_prfill_conf_uint,
+ &blkcg_policy_throtl, cft->private, false);
+ return 0;
}
-static void throtl_update_blkio_group_read_iops(void *key,
- struct blkio_group *blkg, unsigned int read_iops)
+static int tg_set_conf(struct cgroup *cgrp, struct cftype *cft, const char *buf,
+ bool is_u64)
{
- struct throtl_data *td = key;
- struct throtl_grp *tg = tg_of_blkg(blkg);
+ struct blkcg *blkcg = cgroup_to_blkcg(cgrp);
+ struct blkg_conf_ctx ctx;
+ struct throtl_grp *tg;
+ struct throtl_data *td;
+ int ret;
+
+ ret = blkg_conf_prep(blkcg, &blkcg_policy_throtl, buf, &ctx);
+ if (ret)
+ return ret;
+
+ tg = blkg_to_tg(ctx.blkg);
+ td = ctx.blkg->q->td;
+
+ if (!ctx.v)
+ ctx.v = -1;
+
+ if (is_u64)
+ *(u64 *)((void *)tg + cft->private) = ctx.v;
+ else
+ *(unsigned int *)((void *)tg + cft->private) = ctx.v;
+
+ /* XXX: we don't need the following deferred processing */
+ xchg(&tg->limits_changed, true);
+ xchg(&td->limits_changed, true);
+ throtl_schedule_delayed_work(td, 0);
- tg->iops[READ] = read_iops;
- throtl_update_blkio_group_common(td, tg);
+ blkg_conf_finish(&ctx);
+ return 0;
}
-static void throtl_update_blkio_group_write_iops(void *key,
- struct blkio_group *blkg, unsigned int write_iops)
+static int tg_set_conf_u64(struct cgroup *cgrp, struct cftype *cft,
+ const char *buf)
{
- struct throtl_data *td = key;
- struct throtl_grp *tg = tg_of_blkg(blkg);
+ return tg_set_conf(cgrp, cft, buf, true);
+}
- tg->iops[WRITE] = write_iops;
- throtl_update_blkio_group_common(td, tg);
+static int tg_set_conf_uint(struct cgroup *cgrp, struct cftype *cft,
+ const char *buf)
+{
+ return tg_set_conf(cgrp, cft, buf, false);
}
+static struct cftype throtl_files[] = {
+ {
+ .name = "throttle.read_bps_device",
+ .private = offsetof(struct throtl_grp, bps[READ]),
+ .read_seq_string = tg_print_conf_u64,
+ .write_string = tg_set_conf_u64,
+ .max_write_len = 256,
+ },
+ {
+ .name = "throttle.write_bps_device",
+ .private = offsetof(struct throtl_grp, bps[WRITE]),
+ .read_seq_string = tg_print_conf_u64,
+ .write_string = tg_set_conf_u64,
+ .max_write_len = 256,
+ },
+ {
+ .name = "throttle.read_iops_device",
+ .private = offsetof(struct throtl_grp, iops[READ]),
+ .read_seq_string = tg_print_conf_uint,
+ .write_string = tg_set_conf_uint,
+ .max_write_len = 256,
+ },
+ {
+ .name = "throttle.write_iops_device",
+ .private = offsetof(struct throtl_grp, iops[WRITE]),
+ .read_seq_string = tg_print_conf_uint,
+ .write_string = tg_set_conf_uint,
+ .max_write_len = 256,
+ },
+ {
+ .name = "throttle.io_service_bytes",
+ .private = offsetof(struct tg_stats_cpu, service_bytes),
+ .read_seq_string = tg_print_cpu_rwstat,
+ },
+ {
+ .name = "throttle.io_serviced",
+ .private = offsetof(struct tg_stats_cpu, serviced),
+ .read_seq_string = tg_print_cpu_rwstat,
+ },
+ { } /* terminate */
+};
+
static void throtl_shutdown_wq(struct request_queue *q)
{
struct throtl_data *td = q->td;
@@ -1094,19 +1101,13 @@ static void throtl_shutdown_wq(struct request_queue *q)
cancel_delayed_work_sync(&td->throtl_work);
}
-static struct blkio_policy_type blkio_policy_throtl = {
- .ops = {
- .blkio_unlink_group_fn = throtl_unlink_blkio_group,
- .blkio_update_group_read_bps_fn =
- throtl_update_blkio_group_read_bps,
- .blkio_update_group_write_bps_fn =
- throtl_update_blkio_group_write_bps,
- .blkio_update_group_read_iops_fn =
- throtl_update_blkio_group_read_iops,
- .blkio_update_group_write_iops_fn =
- throtl_update_blkio_group_write_iops,
- },
- .plid = BLKIO_POLICY_THROTL,
+static struct blkcg_policy blkcg_policy_throtl = {
+ .pd_size = sizeof(struct throtl_grp),
+ .cftypes = throtl_files,
+
+ .pd_init_fn = throtl_pd_init,
+ .pd_exit_fn = throtl_pd_exit,
+ .pd_reset_stats_fn = throtl_pd_reset_stats,
};
bool blk_throtl_bio(struct request_queue *q, struct bio *bio)
@@ -1114,7 +1115,7 @@ bool blk_throtl_bio(struct request_queue *q, struct bio *bio)
struct throtl_data *td = q->td;
struct throtl_grp *tg;
bool rw = bio_data_dir(bio), update_disptime = true;
- struct blkio_cgroup *blkcg;
+ struct blkcg *blkcg;
bool throttled = false;
if (bio->bi_rw & REQ_THROTTLED) {
@@ -1122,33 +1123,31 @@ bool blk_throtl_bio(struct request_queue *q, struct bio *bio)
goto out;
}
+ /* bio_associate_current() needs ioc, try creating */
+ create_io_context(GFP_ATOMIC, q->node);
+
/*
* A throtl_grp pointer retrieved under rcu can be used to access
* basic fields like stats and io rates. If a group has no rules,
* just update the dispatch stats in lockless manner and return.
*/
-
rcu_read_lock();
- blkcg = task_blkio_cgroup(current);
- tg = throtl_find_tg(td, blkcg);
+ blkcg = bio_blkcg(bio);
+ tg = throtl_lookup_tg(td, blkcg);
if (tg) {
- throtl_tg_fill_dev_details(td, tg);
-
if (tg_no_rule_group(tg, rw)) {
- blkiocg_update_dispatch_stats(&tg->blkg, bio->bi_size,
- rw, rw_is_sync(bio->bi_rw));
- rcu_read_unlock();
- goto out;
+ throtl_update_dispatch_stats(tg_to_blkg(tg),
+ bio->bi_size, bio->bi_rw);
+ goto out_unlock_rcu;
}
}
- rcu_read_unlock();
/*
* Either group has not been allocated yet or it is not an unlimited
* IO group
*/
spin_lock_irq(q->queue_lock);
- tg = throtl_get_tg(td);
+ tg = throtl_lookup_create_tg(td, blkcg);
if (unlikely(!tg))
goto out_unlock;
@@ -1189,6 +1188,7 @@ queue_bio:
tg->io_disp[rw], tg->iops[rw],
tg->nr_queued[READ], tg->nr_queued[WRITE]);
+ bio_associate_current(bio);
throtl_add_bio_tg(q->td, tg, bio);
throttled = true;
@@ -1199,6 +1199,8 @@ queue_bio:
out_unlock:
spin_unlock_irq(q->queue_lock);
+out_unlock_rcu:
+ rcu_read_unlock();
out:
return throttled;
}
@@ -1241,79 +1243,31 @@ void blk_throtl_drain(struct request_queue *q)
int blk_throtl_init(struct request_queue *q)
{
struct throtl_data *td;
- struct throtl_grp *tg;
+ int ret;
td = kzalloc_node(sizeof(*td), GFP_KERNEL, q->node);
if (!td)
return -ENOMEM;
- INIT_HLIST_HEAD(&td->tg_list);
td->tg_service_tree = THROTL_RB_ROOT;
td->limits_changed = false;
INIT_DELAYED_WORK(&td->throtl_work, blk_throtl_work);
- /* alloc and Init root group. */
+ q->td = td;
td->queue = q;
- tg = throtl_alloc_tg(td);
- if (!tg) {
+ /* activate policy */
+ ret = blkcg_activate_policy(q, &blkcg_policy_throtl);
+ if (ret)
kfree(td);
- return -ENOMEM;
- }
-
- td->root_tg = tg;
-
- rcu_read_lock();
- throtl_init_add_tg_lists(td, tg, &blkio_root_cgroup);
- rcu_read_unlock();
-
- /* Attach throtl data to request queue */
- q->td = td;
- return 0;
+ return ret;
}
void blk_throtl_exit(struct request_queue *q)
{
- struct throtl_data *td = q->td;
- bool wait = false;
-
- BUG_ON(!td);
-
- throtl_shutdown_wq(q);
-
- spin_lock_irq(q->queue_lock);
- throtl_release_tgs(td);
-
- /* If there are other groups */
- if (td->nr_undestroyed_grps > 0)
- wait = true;
-
- spin_unlock_irq(q->queue_lock);
-
- /*
- * Wait for tg->blkg->key accessors to exit their grace periods.
- * Do this wait only if there are other undestroyed groups out
- * there (other than root group). This can happen if cgroup deletion
- * path claimed the responsibility of cleaning up a group before
- * queue cleanup code get to the group.
- *
- * Do not call synchronize_rcu() unconditionally as there are drivers
- * which create/delete request queue hundreds of times during scan/boot
- * and synchronize_rcu() can take significant time and slow down boot.
- */
- if (wait)
- synchronize_rcu();
-
- /*
- * Just being safe to make sure after previous flush if some body did
- * update limits through cgroup and another work got queued, cancel
- * it.
- */
+ BUG_ON(!q->td);
throtl_shutdown_wq(q);
-}
-
-void blk_throtl_release(struct request_queue *q)
-{
+ blkcg_deactivate_policy(q, &blkcg_policy_throtl);
kfree(q->td);
}
@@ -1323,8 +1277,7 @@ static int __init throtl_init(void)
if (!kthrotld_workqueue)
panic("Failed to create kthrotld\n");
- blkio_policy_register(&blkio_policy_throtl);
- return 0;
+ return blkcg_policy_register(&blkcg_policy_throtl);
}
module_init(throtl_init);
diff --git a/block/blk.h b/block/blk.h
index d45be871329..85f6ae42f7d 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -23,7 +23,8 @@ void blk_rq_bio_prep(struct request_queue *q, struct request *rq,
struct bio *bio);
int blk_rq_append_bio(struct request_queue *q, struct request *rq,
struct bio *bio);
-void blk_drain_queue(struct request_queue *q, bool drain_all);
+void blk_queue_bypass_start(struct request_queue *q);
+void blk_queue_bypass_end(struct request_queue *q);
void blk_dequeue_request(struct request *rq);
void __blk_queue_free_tags(struct request_queue *q);
bool __blk_end_bidi_request(struct request *rq, int error,
@@ -144,9 +145,6 @@ void blk_queue_congestion_threshold(struct request_queue *q);
int blk_dev_init(void);
-void elv_quiesce_start(struct request_queue *q);
-void elv_quiesce_end(struct request_queue *q);
-
/*
* Return the threshold (number of used requests) at which the queue is
@@ -186,32 +184,30 @@ static inline int blk_do_io_stat(struct request *rq)
*/
void get_io_context(struct io_context *ioc);
struct io_cq *ioc_lookup_icq(struct io_context *ioc, struct request_queue *q);
-struct io_cq *ioc_create_icq(struct request_queue *q, gfp_t gfp_mask);
+struct io_cq *ioc_create_icq(struct io_context *ioc, struct request_queue *q,
+ gfp_t gfp_mask);
void ioc_clear_queue(struct request_queue *q);
-void create_io_context_slowpath(struct task_struct *task, gfp_t gfp_mask,
- int node);
+int create_task_io_context(struct task_struct *task, gfp_t gfp_mask, int node);
/**
* create_io_context - try to create task->io_context
- * @task: target task
* @gfp_mask: allocation mask
* @node: allocation node
*
- * If @task->io_context is %NULL, allocate a new io_context and install it.
- * Returns the current @task->io_context which may be %NULL if allocation
- * failed.
+ * If %current->io_context is %NULL, allocate a new io_context and install
+ * it. Returns the current %current->io_context which may be %NULL if
+ * allocation failed.
*
* Note that this function can't be called with IRQ disabled because
- * task_lock which protects @task->io_context is IRQ-unsafe.
+ * task_lock which protects %current->io_context is IRQ-unsafe.
*/
-static inline struct io_context *create_io_context(struct task_struct *task,
- gfp_t gfp_mask, int node)
+static inline struct io_context *create_io_context(gfp_t gfp_mask, int node)
{
WARN_ON_ONCE(irqs_disabled());
- if (unlikely(!task->io_context))
- create_io_context_slowpath(task, gfp_mask, node);
- return task->io_context;
+ if (unlikely(!current->io_context))
+ create_task_io_context(current, gfp_mask, node);
+ return current->io_context;
}
/*
@@ -222,7 +218,6 @@ extern bool blk_throtl_bio(struct request_queue *q, struct bio *bio);
extern void blk_throtl_drain(struct request_queue *q);
extern int blk_throtl_init(struct request_queue *q);
extern void blk_throtl_exit(struct request_queue *q);
-extern void blk_throtl_release(struct request_queue *q);
#else /* CONFIG_BLK_DEV_THROTTLING */
static inline bool blk_throtl_bio(struct request_queue *q, struct bio *bio)
{
@@ -231,7 +226,6 @@ static inline bool blk_throtl_bio(struct request_queue *q, struct bio *bio)
static inline void blk_throtl_drain(struct request_queue *q) { }
static inline int blk_throtl_init(struct request_queue *q) { return 0; }
static inline void blk_throtl_exit(struct request_queue *q) { }
-static inline void blk_throtl_release(struct request_queue *q) { }
#endif /* CONFIG_BLK_DEV_THROTTLING */
#endif /* BLK_INTERNAL_H */
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 3c38536bd52..673c977cc2b 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -15,7 +15,9 @@
#include <linux/ioprio.h>
#include <linux/blktrace_api.h>
#include "blk.h"
-#include "cfq.h"
+#include "blk-cgroup.h"
+
+static struct blkcg_policy blkcg_policy_cfq __maybe_unused;
/*
* tunables
@@ -171,8 +173,53 @@ enum wl_type_t {
SYNC_WORKLOAD = 2
};
+struct cfqg_stats {
+#ifdef CONFIG_CFQ_GROUP_IOSCHED
+ /* total bytes transferred */
+ struct blkg_rwstat service_bytes;
+ /* total IOs serviced, post merge */
+ struct blkg_rwstat serviced;
+ /* number of ios merged */
+ struct blkg_rwstat merged;
+ /* total time spent on device in ns, may not be accurate w/ queueing */
+ struct blkg_rwstat service_time;
+ /* total time spent waiting in scheduler queue in ns */
+ struct blkg_rwstat wait_time;
+ /* number of IOs queued up */
+ struct blkg_rwstat queued;
+ /* total sectors transferred */
+ struct blkg_stat sectors;
+ /* total disk time and nr sectors dispatched by this group */
+ struct blkg_stat time;
+#ifdef CONFIG_DEBUG_BLK_CGROUP
+ /* time not charged to this cgroup */
+ struct blkg_stat unaccounted_time;
+ /* sum of number of ios queued across all samples */
+ struct blkg_stat avg_queue_size_sum;
+ /* count of samples taken for average */
+ struct blkg_stat avg_queue_size_samples;
+ /* how many times this group has been removed from service tree */
+ struct blkg_stat dequeue;
+ /* total time spent waiting for it to be assigned a timeslice. */
+ struct blkg_stat group_wait_time;
+ /* time spent idling for this blkcg_gq */
+ struct blkg_stat idle_time;
+ /* total time with empty current active q with other requests queued */
+ struct blkg_stat empty_time;
+ /* fields after this shouldn't be cleared on stat reset */
+ uint64_t start_group_wait_time;
+ uint64_t start_idle_time;
+ uint64_t start_empty_time;
+ uint16_t flags;
+#endif /* CONFIG_DEBUG_BLK_CGROUP */
+#endif /* CONFIG_CFQ_GROUP_IOSCHED */
+};
+
/* This is per cgroup per device grouping structure */
struct cfq_group {
+ /* must be the first member */
+ struct blkg_policy_data pd;
+
/* group service_tree member */
struct rb_node rb_node;
@@ -180,7 +227,7 @@ struct cfq_group {
u64 vdisktime;
unsigned int weight;
unsigned int new_weight;
- bool needs_update;
+ unsigned int dev_weight;
/* number of cfqq currently on this group */
int nr_cfqq;
@@ -206,20 +253,21 @@ struct cfq_group {
unsigned long saved_workload_slice;
enum wl_type_t saved_workload;
enum wl_prio_t saved_serving_prio;
- struct blkio_group blkg;
-#ifdef CONFIG_CFQ_GROUP_IOSCHED
- struct hlist_node cfqd_node;
- int ref;
-#endif
+
/* number of requests that are on the dispatch list or inside driver */
int dispatched;
struct cfq_ttime ttime;
+ struct cfqg_stats stats;
};
struct cfq_io_cq {
struct io_cq icq; /* must be the first member */
struct cfq_queue *cfqq[2];
struct cfq_ttime ttime;
+ int ioprio; /* the current ioprio */
+#ifdef CONFIG_CFQ_GROUP_IOSCHED
+ uint64_t blkcg_id; /* the current blkcg ID */
+#endif
};
/*
@@ -229,7 +277,7 @@ struct cfq_data {
struct request_queue *queue;
/* Root service tree for cfq_groups */
struct cfq_rb_root grp_service_tree;
- struct cfq_group root_group;
+ struct cfq_group *root_group;
/*
* The priority currently being served
@@ -303,12 +351,6 @@ struct cfq_data {
struct cfq_queue oom_cfqq;
unsigned long last_delayed_sync;
-
- /* List of cfq groups being managed on this device*/
- struct hlist_head cfqg_list;
-
- /* Number of groups which are on blkcg->blkg_list */
- unsigned int nr_blkcg_linked_grps;
};
static struct cfq_group *cfq_get_next_cfqg(struct cfq_data *cfqd);
@@ -371,21 +413,284 @@ CFQ_CFQQ_FNS(deep);
CFQ_CFQQ_FNS(wait_busy);
#undef CFQ_CFQQ_FNS
+static inline struct cfq_group *pd_to_cfqg(struct blkg_policy_data *pd)
+{
+ return pd ? container_of(pd, struct cfq_group, pd) : NULL;
+}
+
+static inline struct cfq_group *blkg_to_cfqg(struct blkcg_gq *blkg)
+{
+ return pd_to_cfqg(blkg_to_pd(blkg, &blkcg_policy_cfq));
+}
+
+static inline struct blkcg_gq *cfqg_to_blkg(struct cfq_group *cfqg)
+{
+ return pd_to_blkg(&cfqg->pd);
+}
+
+#if defined(CONFIG_CFQ_GROUP_IOSCHED) && defined(CONFIG_DEBUG_BLK_CGROUP)
+
+/* cfqg stats flags */
+enum cfqg_stats_flags {
+ CFQG_stats_waiting = 0,
+ CFQG_stats_idling,
+ CFQG_stats_empty,
+};
+
+#define CFQG_FLAG_FNS(name) \
+static inline void cfqg_stats_mark_##name(struct cfqg_stats *stats) \
+{ \
+ stats->flags |= (1 << CFQG_stats_##name); \
+} \
+static inline void cfqg_stats_clear_##name(struct cfqg_stats *stats) \
+{ \
+ stats->flags &= ~(1 << CFQG_stats_##name); \
+} \
+static inline int cfqg_stats_##name(struct cfqg_stats *stats) \
+{ \
+ return (stats->flags & (1 << CFQG_stats_##name)) != 0; \
+} \
+
+CFQG_FLAG_FNS(waiting)
+CFQG_FLAG_FNS(idling)
+CFQG_FLAG_FNS(empty)
+#undef CFQG_FLAG_FNS
+
+/* This should be called with the queue_lock held. */
+static void cfqg_stats_update_group_wait_time(struct cfqg_stats *stats)
+{
+ unsigned long long now;
+
+ if (!cfqg_stats_waiting(stats))
+ return;
+
+ now = sched_clock();
+ if (time_after64(now, stats->start_group_wait_time))
+ blkg_stat_add(&stats->group_wait_time,
+ now - stats->start_group_wait_time);
+ cfqg_stats_clear_waiting(stats);
+}
+
+/* This should be called with the queue_lock held. */
+static void cfqg_stats_set_start_group_wait_time(struct cfq_group *cfqg,
+ struct cfq_group *curr_cfqg)
+{
+ struct cfqg_stats *stats = &cfqg->stats;
+
+ if (cfqg_stats_waiting(stats))
+ return;
+ if (cfqg == curr_cfqg)
+ return;
+ stats->start_group_wait_time = sched_clock();
+ cfqg_stats_mark_waiting(stats);
+}
+
+/* This should be called with the queue_lock held. */
+static void cfqg_stats_end_empty_time(struct cfqg_stats *stats)
+{
+ unsigned long long now;
+
+ if (!cfqg_stats_empty(stats))
+ return;
+
+ now = sched_clock();
+ if (time_after64(now, stats->start_empty_time))
+ blkg_stat_add(&stats->empty_time,
+ now - stats->start_empty_time);
+ cfqg_stats_clear_empty(stats);
+}
+
+static void cfqg_stats_update_dequeue(struct cfq_group *cfqg)
+{
+ blkg_stat_add(&cfqg->stats.dequeue, 1);
+}
+
+static void cfqg_stats_set_start_empty_time(struct cfq_group *cfqg)
+{
+ struct cfqg_stats *stats = &cfqg->stats;
+
+ if (blkg_rwstat_sum(&stats->queued))
+ return;
+
+ /*
+ * group is already marked empty. This can happen if cfqq got new
+ * request in parent group and moved to this group while being added
+ * to service tree. Just ignore the event and move on.
+ */
+ if (cfqg_stats_empty(stats))
+ return;
+
+ stats->start_empty_time = sched_clock();
+ cfqg_stats_mark_empty(stats);
+}
+
+static void cfqg_stats_update_idle_time(struct cfq_group *cfqg)
+{
+ struct cfqg_stats *stats = &cfqg->stats;
+
+ if (cfqg_stats_idling(stats)) {
+ unsigned long long now = sched_clock();
+
+ if (time_after64(now, stats->start_idle_time))
+ blkg_stat_add(&stats->idle_time,
+ now - stats->start_idle_time);
+ cfqg_stats_clear_idling(stats);
+ }
+}
+
+static void cfqg_stats_set_start_idle_time(struct cfq_group *cfqg)
+{
+ struct cfqg_stats *stats = &cfqg->stats;
+
+ BUG_ON(cfqg_stats_idling(stats));
+
+ stats->start_idle_time = sched_clock();
+ cfqg_stats_mark_idling(stats);
+}
+
+static void cfqg_stats_update_avg_queue_size(struct cfq_group *cfqg)
+{
+ struct cfqg_stats *stats = &cfqg->stats;
+
+ blkg_stat_add(&stats->avg_queue_size_sum,
+ blkg_rwstat_sum(&stats->queued));
+ blkg_stat_add(&stats->avg_queue_size_samples, 1);
+ cfqg_stats_update_group_wait_time(stats);
+}
+
+#else /* CONFIG_CFQ_GROUP_IOSCHED && CONFIG_DEBUG_BLK_CGROUP */
+
+static inline void cfqg_stats_set_start_group_wait_time(struct cfq_group *cfqg, struct cfq_group *curr_cfqg) { }
+static inline void cfqg_stats_end_empty_time(struct cfqg_stats *stats) { }
+static inline void cfqg_stats_update_dequeue(struct cfq_group *cfqg) { }
+static inline void cfqg_stats_set_start_empty_time(struct cfq_group *cfqg) { }
+static inline void cfqg_stats_update_idle_time(struct cfq_group *cfqg) { }
+static inline void cfqg_stats_set_start_idle_time(struct cfq_group *cfqg) { }
+static inline void cfqg_stats_update_avg_queue_size(struct cfq_group *cfqg) { }
+
+#endif /* CONFIG_CFQ_GROUP_IOSCHED && CONFIG_DEBUG_BLK_CGROUP */
+
#ifdef CONFIG_CFQ_GROUP_IOSCHED
-#define cfq_log_cfqq(cfqd, cfqq, fmt, args...) \
+
+static inline void cfqg_get(struct cfq_group *cfqg)
+{
+ return blkg_get(cfqg_to_blkg(cfqg));
+}
+
+static inline void cfqg_put(struct cfq_group *cfqg)
+{
+ return blkg_put(cfqg_to_blkg(cfqg));
+}
+
+#define cfq_log_cfqq(cfqd, cfqq, fmt, args...) do { \
+ char __pbuf[128]; \
+ \
+ blkg_path(cfqg_to_blkg((cfqq)->cfqg), __pbuf, sizeof(__pbuf)); \
blk_add_trace_msg((cfqd)->queue, "cfq%d%c %s " fmt, (cfqq)->pid, \
- cfq_cfqq_sync((cfqq)) ? 'S' : 'A', \
- blkg_path(&(cfqq)->cfqg->blkg), ##args)
+ cfq_cfqq_sync((cfqq)) ? 'S' : 'A', \
+ __pbuf, ##args); \
+} while (0)
-#define cfq_log_cfqg(cfqd, cfqg, fmt, args...) \
- blk_add_trace_msg((cfqd)->queue, "%s " fmt, \
- blkg_path(&(cfqg)->blkg), ##args) \
+#define cfq_log_cfqg(cfqd, cfqg, fmt, args...) do { \
+ char __pbuf[128]; \
+ \
+ blkg_path(cfqg_to_blkg(cfqg), __pbuf, sizeof(__pbuf)); \
+ blk_add_trace_msg((cfqd)->queue, "%s " fmt, __pbuf, ##args); \
+} while (0)
+
+static inline void cfqg_stats_update_io_add(struct cfq_group *cfqg,
+ struct cfq_group *curr_cfqg, int rw)
+{
+ blkg_rwstat_add(&cfqg->stats.queued, rw, 1);
+ cfqg_stats_end_empty_time(&cfqg->stats);
+ cfqg_stats_set_start_group_wait_time(cfqg, curr_cfqg);
+}
+
+static inline void cfqg_stats_update_timeslice_used(struct cfq_group *cfqg,
+ unsigned long time, unsigned long unaccounted_time)
+{
+ blkg_stat_add(&cfqg->stats.time, time);
+#ifdef CONFIG_DEBUG_BLK_CGROUP
+ blkg_stat_add(&cfqg->stats.unaccounted_time, unaccounted_time);
+#endif
+}
+
+static inline void cfqg_stats_update_io_remove(struct cfq_group *cfqg, int rw)
+{
+ blkg_rwstat_add(&cfqg->stats.queued, rw, -1);
+}
+
+static inline void cfqg_stats_update_io_merged(struct cfq_group *cfqg, int rw)
+{
+ blkg_rwstat_add(&cfqg->stats.merged, rw, 1);
+}
+
+static inline void cfqg_stats_update_dispatch(struct cfq_group *cfqg,
+ uint64_t bytes, int rw)
+{
+ blkg_stat_add(&cfqg->stats.sectors, bytes >> 9);
+ blkg_rwstat_add(&cfqg->stats.serviced, rw, 1);
+ blkg_rwstat_add(&cfqg->stats.service_bytes, rw, bytes);
+}
+
+static inline void cfqg_stats_update_completion(struct cfq_group *cfqg,
+ uint64_t start_time, uint64_t io_start_time, int rw)
+{
+ struct cfqg_stats *stats = &cfqg->stats;
+ unsigned long long now = sched_clock();
+
+ if (time_after64(now, io_start_time))
+ blkg_rwstat_add(&stats->service_time, rw, now - io_start_time);
+ if (time_after64(io_start_time, start_time))
+ blkg_rwstat_add(&stats->wait_time, rw,
+ io_start_time - start_time);
+}
+
+static void cfq_pd_reset_stats(struct blkcg_gq *blkg)
+{
+ struct cfq_group *cfqg = blkg_to_cfqg(blkg);
+ struct cfqg_stats *stats = &cfqg->stats;
+
+ /* queued stats shouldn't be cleared */
+ blkg_rwstat_reset(&stats->service_bytes);
+ blkg_rwstat_reset(&stats->serviced);
+ blkg_rwstat_reset(&stats->merged);
+ blkg_rwstat_reset(&stats->service_time);
+ blkg_rwstat_reset(&stats->wait_time);
+ blkg_stat_reset(&stats->time);
+#ifdef CONFIG_DEBUG_BLK_CGROUP
+ blkg_stat_reset(&stats->unaccounted_time);
+ blkg_stat_reset(&stats->avg_queue_size_sum);
+ blkg_stat_reset(&stats->avg_queue_size_samples);
+ blkg_stat_reset(&stats->dequeue);
+ blkg_stat_reset(&stats->group_wait_time);
+ blkg_stat_reset(&stats->idle_time);
+ blkg_stat_reset(&stats->empty_time);
+#endif
+}
+
+#else /* CONFIG_CFQ_GROUP_IOSCHED */
+
+static inline void cfqg_get(struct cfq_group *cfqg) { }
+static inline void cfqg_put(struct cfq_group *cfqg) { }
-#else
#define cfq_log_cfqq(cfqd, cfqq, fmt, args...) \
blk_add_trace_msg((cfqd)->queue, "cfq%d " fmt, (cfqq)->pid, ##args)
#define cfq_log_cfqg(cfqd, cfqg, fmt, args...) do {} while (0)
-#endif
+
+static inline void cfqg_stats_update_io_add(struct cfq_group *cfqg,
+ struct cfq_group *curr_cfqg, int rw) { }
+static inline void cfqg_stats_update_timeslice_used(struct cfq_group *cfqg,
+ unsigned long time, unsigned long unaccounted_time) { }
+static inline void cfqg_stats_update_io_remove(struct cfq_group *cfqg, int rw) { }
+static inline void cfqg_stats_update_io_merged(struct cfq_group *cfqg, int rw) { }
+static inline void cfqg_stats_update_dispatch(struct cfq_group *cfqg,
+ uint64_t bytes, int rw) { }
+static inline void cfqg_stats_update_completion(struct cfq_group *cfqg,
+ uint64_t start_time, uint64_t io_start_time, int rw) { }
+
+#endif /* CONFIG_CFQ_GROUP_IOSCHED */
+
#define cfq_log(cfqd, fmt, args...) \
blk_add_trace_msg((cfqd)->queue, "cfq " fmt, ##args)
@@ -466,8 +771,9 @@ static inline int cfqg_busy_async_queues(struct cfq_data *cfqd,
}
static void cfq_dispatch_insert(struct request_queue *, struct request *);
-static struct cfq_queue *cfq_get_queue(struct cfq_data *, bool,
- struct io_context *, gfp_t);
+static struct cfq_queue *cfq_get_queue(struct cfq_data *cfqd, bool is_sync,
+ struct cfq_io_cq *cic, struct bio *bio,
+ gfp_t gfp_mask);
static inline struct cfq_io_cq *icq_to_cic(struct io_cq *icq)
{
@@ -545,7 +851,7 @@ static inline u64 cfq_scale_slice(unsigned long delta, struct cfq_group *cfqg)
{
u64 d = delta << CFQ_SERVICE_SHIFT;
- d = d * BLKIO_WEIGHT_DEFAULT;
+ d = d * CFQ_WEIGHT_DEFAULT;
do_div(d, cfqg->weight);
return d;
}
@@ -872,9 +1178,9 @@ static void
cfq_update_group_weight(struct cfq_group *cfqg)
{
BUG_ON(!RB_EMPTY_NODE(&cfqg->rb_node));
- if (cfqg->needs_update) {
+ if (cfqg->new_weight) {
cfqg->weight = cfqg->new_weight;
- cfqg->needs_update = false;
+ cfqg->new_weight = 0;
}
}
@@ -936,7 +1242,7 @@ cfq_group_notify_queue_del(struct cfq_data *cfqd, struct cfq_group *cfqg)
cfq_log_cfqg(cfqd, cfqg, "del_from_rr group");
cfq_group_service_tree_del(st, cfqg);
cfqg->saved_workload_slice = 0;
- cfq_blkiocg_update_dequeue_stats(&cfqg->blkg, 1);
+ cfqg_stats_update_dequeue(cfqg);
}
static inline unsigned int cfq_cfqq_slice_usage(struct cfq_queue *cfqq,
@@ -1008,178 +1314,59 @@ static void cfq_group_served(struct cfq_data *cfqd, struct cfq_group *cfqg,
"sl_used=%u disp=%u charge=%u iops=%u sect=%lu",
used_sl, cfqq->slice_dispatch, charge,
iops_mode(cfqd), cfqq->nr_sectors);
- cfq_blkiocg_update_timeslice_used(&cfqg->blkg, used_sl,
- unaccounted_sl);
- cfq_blkiocg_set_start_empty_time(&cfqg->blkg);
+ cfqg_stats_update_timeslice_used(cfqg, used_sl, unaccounted_sl);
+ cfqg_stats_set_start_empty_time(cfqg);
}
-#ifdef CONFIG_CFQ_GROUP_IOSCHED
-static inline struct cfq_group *cfqg_of_blkg(struct blkio_group *blkg)
-{
- if (blkg)
- return container_of(blkg, struct cfq_group, blkg);
- return NULL;
-}
-
-static void cfq_update_blkio_group_weight(void *key, struct blkio_group *blkg,
- unsigned int weight)
-{
- struct cfq_group *cfqg = cfqg_of_blkg(blkg);
- cfqg->new_weight = weight;
- cfqg->needs_update = true;
-}
-
-static void cfq_init_add_cfqg_lists(struct cfq_data *cfqd,
- struct cfq_group *cfqg, struct blkio_cgroup *blkcg)
-{
- struct backing_dev_info *bdi = &cfqd->queue->backing_dev_info;
- unsigned int major, minor;
-
- /*
- * Add group onto cgroup list. It might happen that bdi->dev is
- * not initialized yet. Initialize this new group without major
- * and minor info and this info will be filled in once a new thread
- * comes for IO.
- */
- if (bdi->dev) {
- sscanf(dev_name(bdi->dev), "%u:%u", &major, &minor);
- cfq_blkiocg_add_blkio_group(blkcg, &cfqg->blkg,
- (void *)cfqd, MKDEV(major, minor));
- } else
- cfq_blkiocg_add_blkio_group(blkcg, &cfqg->blkg,
- (void *)cfqd, 0);
-
- cfqd->nr_blkcg_linked_grps++;
- cfqg->weight = blkcg_get_weight(blkcg, cfqg->blkg.dev);
-
- /* Add group on cfqd list */
- hlist_add_head(&cfqg->cfqd_node, &cfqd->cfqg_list);
-}
-
-/*
- * Should be called from sleepable context. No request queue lock as per
- * cpu stats are allocated dynamically and alloc_percpu needs to be called
- * from sleepable context.
+/**
+ * cfq_init_cfqg_base - initialize base part of a cfq_group
+ * @cfqg: cfq_group to initialize
+ *
+ * Initialize the base part which is used whether %CONFIG_CFQ_GROUP_IOSCHED
+ * is enabled or not.
*/
-static struct cfq_group * cfq_alloc_cfqg(struct cfq_data *cfqd)
+static void cfq_init_cfqg_base(struct cfq_group *cfqg)
{
- struct cfq_group *cfqg = NULL;
- int i, j, ret;
struct cfq_rb_root *st;
-
- cfqg = kzalloc_node(sizeof(*cfqg), GFP_ATOMIC, cfqd->queue->node);
- if (!cfqg)
- return NULL;
+ int i, j;
for_each_cfqg_st(cfqg, i, j, st)
*st = CFQ_RB_ROOT;
RB_CLEAR_NODE(&cfqg->rb_node);
cfqg->ttime.last_end_request = jiffies;
-
- /*
- * Take the initial reference that will be released on destroy
- * This can be thought of a joint reference by cgroup and
- * elevator which will be dropped by either elevator exit
- * or cgroup deletion path depending on who is exiting first.
- */
- cfqg->ref = 1;
-
- ret = blkio_alloc_blkg_stats(&cfqg->blkg);
- if (ret) {
- kfree(cfqg);
- return NULL;
- }
-
- return cfqg;
}
-static struct cfq_group *
-cfq_find_cfqg(struct cfq_data *cfqd, struct blkio_cgroup *blkcg)
+#ifdef CONFIG_CFQ_GROUP_IOSCHED
+static void cfq_pd_init(struct blkcg_gq *blkg)
{
- struct cfq_group *cfqg = NULL;
- void *key = cfqd;
- struct backing_dev_info *bdi = &cfqd->queue->backing_dev_info;
- unsigned int major, minor;
-
- /*
- * This is the common case when there are no blkio cgroups.
- * Avoid lookup in this case
- */
- if (blkcg == &blkio_root_cgroup)
- cfqg = &cfqd->root_group;
- else
- cfqg = cfqg_of_blkg(blkiocg_lookup_group(blkcg, key));
-
- if (cfqg && !cfqg->blkg.dev && bdi->dev && dev_name(bdi->dev)) {
- sscanf(dev_name(bdi->dev), "%u:%u", &major, &minor);
- cfqg->blkg.dev = MKDEV(major, minor);
- }
+ struct cfq_group *cfqg = blkg_to_cfqg(blkg);
- return cfqg;
+ cfq_init_cfqg_base(cfqg);
+ cfqg->weight = blkg->blkcg->cfq_weight;
}
/*
* Search for the cfq group current task belongs to. request_queue lock must
* be held.
*/
-static struct cfq_group *cfq_get_cfqg(struct cfq_data *cfqd)
+static struct cfq_group *cfq_lookup_create_cfqg(struct cfq_data *cfqd,
+ struct blkcg *blkcg)
{
- struct blkio_cgroup *blkcg;
- struct cfq_group *cfqg = NULL, *__cfqg = NULL;
struct request_queue *q = cfqd->queue;
+ struct cfq_group *cfqg = NULL;
- rcu_read_lock();
- blkcg = task_blkio_cgroup(current);
- cfqg = cfq_find_cfqg(cfqd, blkcg);
- if (cfqg) {
- rcu_read_unlock();
- return cfqg;
- }
-
- /*
- * Need to allocate a group. Allocation of group also needs allocation
- * of per cpu stats which in-turn takes a mutex() and can block. Hence
- * we need to drop rcu lock and queue_lock before we call alloc.
- *
- * Not taking any queue reference here and assuming that queue is
- * around by the time we return. CFQ queue allocation code does
- * the same. It might be racy though.
- */
-
- rcu_read_unlock();
- spin_unlock_irq(q->queue_lock);
-
- cfqg = cfq_alloc_cfqg(cfqd);
-
- spin_lock_irq(q->queue_lock);
-
- rcu_read_lock();
- blkcg = task_blkio_cgroup(current);
-
- /*
- * If some other thread already allocated the group while we were
- * not holding queue lock, free up the group
- */
- __cfqg = cfq_find_cfqg(cfqd, blkcg);
+ /* avoid lookup for the common case where there's no blkcg */
+ if (blkcg == &blkcg_root) {
+ cfqg = cfqd->root_group;
+ } else {
+ struct blkcg_gq *blkg;
- if (__cfqg) {
- kfree(cfqg);
- rcu_read_unlock();
- return __cfqg;
+ blkg = blkg_lookup_create(blkcg, q);
+ if (!IS_ERR(blkg))
+ cfqg = blkg_to_cfqg(blkg);
}
- if (!cfqg)
- cfqg = &cfqd->root_group;
-
- cfq_init_add_cfqg_lists(cfqd, cfqg, blkcg);
- rcu_read_unlock();
- return cfqg;
-}
-
-static inline struct cfq_group *cfq_ref_get_cfqg(struct cfq_group *cfqg)
-{
- cfqg->ref++;
return cfqg;
}
@@ -1187,94 +1374,224 @@ static void cfq_link_cfqq_cfqg(struct cfq_queue *cfqq, struct cfq_group *cfqg)
{
/* Currently, all async queues are mapped to root group */
if (!cfq_cfqq_sync(cfqq))
- cfqg = &cfqq->cfqd->root_group;
+ cfqg = cfqq->cfqd->root_group;
cfqq->cfqg = cfqg;
/* cfqq reference on cfqg */
- cfqq->cfqg->ref++;
+ cfqg_get(cfqg);
}
-static void cfq_put_cfqg(struct cfq_group *cfqg)
+static u64 cfqg_prfill_weight_device(struct seq_file *sf,
+ struct blkg_policy_data *pd, int off)
{
- struct cfq_rb_root *st;
- int i, j;
+ struct cfq_group *cfqg = pd_to_cfqg(pd);
- BUG_ON(cfqg->ref <= 0);
- cfqg->ref--;
- if (cfqg->ref)
- return;
- for_each_cfqg_st(cfqg, i, j, st)
- BUG_ON(!RB_EMPTY_ROOT(&st->rb));
- free_percpu(cfqg->blkg.stats_cpu);
- kfree(cfqg);
+ if (!cfqg->dev_weight)
+ return 0;
+ return __blkg_prfill_u64(sf, pd, cfqg->dev_weight);
}
-static void cfq_destroy_cfqg(struct cfq_data *cfqd, struct cfq_group *cfqg)
+static int cfqg_print_weight_device(struct cgroup *cgrp, struct cftype *cft,
+ struct seq_file *sf)
{
- /* Something wrong if we are trying to remove same group twice */
- BUG_ON(hlist_unhashed(&cfqg->cfqd_node));
+ blkcg_print_blkgs(sf, cgroup_to_blkcg(cgrp),
+ cfqg_prfill_weight_device, &blkcg_policy_cfq, 0,
+ false);
+ return 0;
+}
- hlist_del_init(&cfqg->cfqd_node);
+static int cfq_print_weight(struct cgroup *cgrp, struct cftype *cft,
+ struct seq_file *sf)
+{
+ seq_printf(sf, "%u\n", cgroup_to_blkcg(cgrp)->cfq_weight);
+ return 0;
+}
- BUG_ON(cfqd->nr_blkcg_linked_grps <= 0);
- cfqd->nr_blkcg_linked_grps--;
+static int cfqg_set_weight_device(struct cgroup *cgrp, struct cftype *cft,
+ const char *buf)
+{
+ struct blkcg *blkcg = cgroup_to_blkcg(cgrp);
+ struct blkg_conf_ctx ctx;
+ struct cfq_group *cfqg;
+ int ret;
- /*
- * Put the reference taken at the time of creation so that when all
- * queues are gone, group can be destroyed.
- */
- cfq_put_cfqg(cfqg);
+ ret = blkg_conf_prep(blkcg, &blkcg_policy_cfq, buf, &ctx);
+ if (ret)
+ return ret;
+
+ ret = -EINVAL;
+ cfqg = blkg_to_cfqg(ctx.blkg);
+ if (!ctx.v || (ctx.v >= CFQ_WEIGHT_MIN && ctx.v <= CFQ_WEIGHT_MAX)) {
+ cfqg->dev_weight = ctx.v;
+ cfqg->new_weight = cfqg->dev_weight ?: blkcg->cfq_weight;
+ ret = 0;
+ }
+
+ blkg_conf_finish(&ctx);
+ return ret;
}
-static void cfq_release_cfq_groups(struct cfq_data *cfqd)
+static int cfq_set_weight(struct cgroup *cgrp, struct cftype *cft, u64 val)
{
- struct hlist_node *pos, *n;
- struct cfq_group *cfqg;
+ struct blkcg *blkcg = cgroup_to_blkcg(cgrp);
+ struct blkcg_gq *blkg;
+ struct hlist_node *n;
- hlist_for_each_entry_safe(cfqg, pos, n, &cfqd->cfqg_list, cfqd_node) {
- /*
- * If cgroup removal path got to blk_group first and removed
- * it from cgroup list, then it will take care of destroying
- * cfqg also.
- */
- if (!cfq_blkiocg_del_blkio_group(&cfqg->blkg))
- cfq_destroy_cfqg(cfqd, cfqg);
+ if (val < CFQ_WEIGHT_MIN || val > CFQ_WEIGHT_MAX)
+ return -EINVAL;
+
+ spin_lock_irq(&blkcg->lock);
+ blkcg->cfq_weight = (unsigned int)val;
+
+ hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) {
+ struct cfq_group *cfqg = blkg_to_cfqg(blkg);
+
+ if (cfqg && !cfqg->dev_weight)
+ cfqg->new_weight = blkcg->cfq_weight;
}
+
+ spin_unlock_irq(&blkcg->lock);
+ return 0;
}
-/*
- * Blk cgroup controller notification saying that blkio_group object is being
- * delinked as associated cgroup object is going away. That also means that
- * no new IO will come in this group. So get rid of this group as soon as
- * any pending IO in the group is finished.
- *
- * This function is called under rcu_read_lock(). key is the rcu protected
- * pointer. That means "key" is a valid cfq_data pointer as long as we are rcu
- * read lock.
- *
- * "key" was fetched from blkio_group under blkio_cgroup->lock. That means
- * it should not be NULL as even if elevator was exiting, cgroup deltion
- * path got to it first.
- */
-static void cfq_unlink_blkio_group(void *key, struct blkio_group *blkg)
+static int cfqg_print_stat(struct cgroup *cgrp, struct cftype *cft,
+ struct seq_file *sf)
{
- unsigned long flags;
- struct cfq_data *cfqd = key;
+ struct blkcg *blkcg = cgroup_to_blkcg(cgrp);
- spin_lock_irqsave(cfqd->queue->queue_lock, flags);
- cfq_destroy_cfqg(cfqd, cfqg_of_blkg(blkg));
- spin_unlock_irqrestore(cfqd->queue->queue_lock, flags);
+ blkcg_print_blkgs(sf, blkcg, blkg_prfill_stat, &blkcg_policy_cfq,
+ cft->private, false);
+ return 0;
}
-#else /* GROUP_IOSCHED */
-static struct cfq_group *cfq_get_cfqg(struct cfq_data *cfqd)
+static int cfqg_print_rwstat(struct cgroup *cgrp, struct cftype *cft,
+ struct seq_file *sf)
{
- return &cfqd->root_group;
+ struct blkcg *blkcg = cgroup_to_blkcg(cgrp);
+
+ blkcg_print_blkgs(sf, blkcg, blkg_prfill_rwstat, &blkcg_policy_cfq,
+ cft->private, true);
+ return 0;
}
-static inline struct cfq_group *cfq_ref_get_cfqg(struct cfq_group *cfqg)
+#ifdef CONFIG_DEBUG_BLK_CGROUP
+static u64 cfqg_prfill_avg_queue_size(struct seq_file *sf,
+ struct blkg_policy_data *pd, int off)
{
- return cfqg;
+ struct cfq_group *cfqg = pd_to_cfqg(pd);
+ u64 samples = blkg_stat_read(&cfqg->stats.avg_queue_size_samples);
+ u64 v = 0;
+
+ if (samples) {
+ v = blkg_stat_read(&cfqg->stats.avg_queue_size_sum);
+ do_div(v, samples);
+ }
+ __blkg_prfill_u64(sf, pd, v);
+ return 0;
+}
+
+/* print avg_queue_size */
+static int cfqg_print_avg_queue_size(struct cgroup *cgrp, struct cftype *cft,
+ struct seq_file *sf)
+{
+ struct blkcg *blkcg = cgroup_to_blkcg(cgrp);
+
+ blkcg_print_blkgs(sf, blkcg, cfqg_prfill_avg_queue_size,
+ &blkcg_policy_cfq, 0, false);
+ return 0;
+}
+#endif /* CONFIG_DEBUG_BLK_CGROUP */
+
+static struct cftype cfq_blkcg_files[] = {
+ {
+ .name = "weight_device",
+ .read_seq_string = cfqg_print_weight_device,
+ .write_string = cfqg_set_weight_device,
+ .max_write_len = 256,
+ },
+ {
+ .name = "weight",
+ .read_seq_string = cfq_print_weight,
+ .write_u64 = cfq_set_weight,
+ },
+ {
+ .name = "time",
+ .private = offsetof(struct cfq_group, stats.time),
+ .read_seq_string = cfqg_print_stat,
+ },
+ {
+ .name = "sectors",
+ .private = offsetof(struct cfq_group, stats.sectors),
+ .read_seq_string = cfqg_print_stat,
+ },
+ {
+ .name = "io_service_bytes",
+ .private = offsetof(struct cfq_group, stats.service_bytes),
+ .read_seq_string = cfqg_print_rwstat,
+ },
+ {
+ .name = "io_serviced",
+ .private = offsetof(struct cfq_group, stats.serviced),
+ .read_seq_string = cfqg_print_rwstat,
+ },
+ {
+ .name = "io_service_time",
+ .private = offsetof(struct cfq_group, stats.service_time),
+ .read_seq_string = cfqg_print_rwstat,
+ },
+ {
+ .name = "io_wait_time",
+ .private = offsetof(struct cfq_group, stats.wait_time),
+ .read_seq_string = cfqg_print_rwstat,
+ },
+ {
+ .name = "io_merged",
+ .private = offsetof(struct cfq_group, stats.merged),
+ .read_seq_string = cfqg_print_rwstat,
+ },
+ {
+ .name = "io_queued",
+ .private = offsetof(struct cfq_group, stats.queued),
+ .read_seq_string = cfqg_print_rwstat,
+ },
+#ifdef CONFIG_DEBUG_BLK_CGROUP
+ {
+ .name = "avg_queue_size",
+ .read_seq_string = cfqg_print_avg_queue_size,
+ },
+ {
+ .name = "group_wait_time",
+ .private = offsetof(struct cfq_group, stats.group_wait_time),
+ .read_seq_string = cfqg_print_stat,
+ },
+ {
+ .name = "idle_time",
+ .private = offsetof(struct cfq_group, stats.idle_time),
+ .read_seq_string = cfqg_print_stat,
+ },
+ {
+ .name = "empty_time",
+ .private = offsetof(struct cfq_group, stats.empty_time),
+ .read_seq_string = cfqg_print_stat,
+ },
+ {
+ .name = "dequeue",
+ .private = offsetof(struct cfq_group, stats.dequeue),
+ .read_seq_string = cfqg_print_stat,
+ },
+ {
+ .name = "unaccounted_time",
+ .private = offsetof(struct cfq_group, stats.unaccounted_time),
+ .read_seq_string = cfqg_print_stat,
+ },
+#endif /* CONFIG_DEBUG_BLK_CGROUP */
+ { } /* terminate */
+};
+#else /* GROUP_IOSCHED */
+static struct cfq_group *cfq_lookup_create_cfqg(struct cfq_data *cfqd,
+ struct blkcg *blkcg)
+{
+ return cfqd->root_group;
}
static inline void
@@ -1282,9 +1599,6 @@ cfq_link_cfqq_cfqg(struct cfq_queue *cfqq, struct cfq_group *cfqg) {
cfqq->cfqg = cfqg;
}
-static void cfq_release_cfq_groups(struct cfq_data *cfqd) {}
-static inline void cfq_put_cfqg(struct cfq_group *cfqg) {}
-
#endif /* GROUP_IOSCHED */
/*
@@ -1551,12 +1865,10 @@ static void cfq_reposition_rq_rb(struct cfq_queue *cfqq, struct request *rq)
{
elv_rb_del(&cfqq->sort_list, rq);
cfqq->queued[rq_is_sync(rq)]--;
- cfq_blkiocg_update_io_remove_stats(&(RQ_CFQG(rq))->blkg,
- rq_data_dir(rq), rq_is_sync(rq));
+ cfqg_stats_update_io_remove(RQ_CFQG(rq), rq->cmd_flags);
cfq_add_rq_rb(rq);
- cfq_blkiocg_update_io_add_stats(&(RQ_CFQG(rq))->blkg,
- &cfqq->cfqd->serving_group->blkg, rq_data_dir(rq),
- rq_is_sync(rq));
+ cfqg_stats_update_io_add(RQ_CFQG(rq), cfqq->cfqd->serving_group,
+ rq->cmd_flags);
}
static struct request *
@@ -1612,8 +1924,7 @@ static void cfq_remove_request(struct request *rq)
cfq_del_rq_rb(rq);
cfqq->cfqd->rq_queued--;
- cfq_blkiocg_update_io_remove_stats(&(RQ_CFQG(rq))->blkg,
- rq_data_dir(rq), rq_is_sync(rq));
+ cfqg_stats_update_io_remove(RQ_CFQG(rq), rq->cmd_flags);
if (rq->cmd_flags & REQ_PRIO) {
WARN_ON(!cfqq->prio_pending);
cfqq->prio_pending--;
@@ -1648,8 +1959,7 @@ static void cfq_merged_request(struct request_queue *q, struct request *req,
static void cfq_bio_merged(struct request_queue *q, struct request *req,
struct bio *bio)
{
- cfq_blkiocg_update_io_merged_stats(&(RQ_CFQG(req))->blkg,
- bio_data_dir(bio), cfq_bio_sync(bio));
+ cfqg_stats_update_io_merged(RQ_CFQG(req), bio->bi_rw);
}
static void
@@ -1671,8 +1981,7 @@ cfq_merged_requests(struct request_queue *q, struct request *rq,
if (cfqq->next_rq == next)
cfqq->next_rq = rq;
cfq_remove_request(next);
- cfq_blkiocg_update_io_merged_stats(&(RQ_CFQG(rq))->blkg,
- rq_data_dir(next), rq_is_sync(next));
+ cfqg_stats_update_io_merged(RQ_CFQG(rq), next->cmd_flags);
cfqq = RQ_CFQQ(next);
/*
@@ -1713,7 +2022,7 @@ static int cfq_allow_merge(struct request_queue *q, struct request *rq,
static inline void cfq_del_timer(struct cfq_data *cfqd, struct cfq_queue *cfqq)
{
del_timer(&cfqd->idle_slice_timer);
- cfq_blkiocg_update_idle_time_stats(&cfqq->cfqg->blkg);
+ cfqg_stats_update_idle_time(cfqq->cfqg);
}
static void __cfq_set_active_queue(struct cfq_data *cfqd,
@@ -1722,7 +2031,7 @@ static void __cfq_set_active_queue(struct cfq_data *cfqd,
if (cfqq) {
cfq_log_cfqq(cfqd, cfqq, "set_active wl_prio:%d wl_type:%d",
cfqd->serving_prio, cfqd->serving_type);
- cfq_blkiocg_update_avg_queue_size_stats(&cfqq->cfqg->blkg);
+ cfqg_stats_update_avg_queue_size(cfqq->cfqg);
cfqq->slice_start = 0;
cfqq->dispatch_start = jiffies;
cfqq->allocated_slice = 0;
@@ -2043,7 +2352,7 @@ static void cfq_arm_slice_timer(struct cfq_data *cfqd)
* task has exited, don't wait
*/
cic = cfqd->active_cic;
- if (!cic || !atomic_read(&cic->icq.ioc->nr_tasks))
+ if (!cic || !atomic_read(&cic->icq.ioc->active_ref))
return;
/*
@@ -2070,7 +2379,7 @@ static void cfq_arm_slice_timer(struct cfq_data *cfqd)
sl = cfqd->cfq_slice_idle;
mod_timer(&cfqd->idle_slice_timer, jiffies + sl);
- cfq_blkiocg_update_set_idle_time_stats(&cfqq->cfqg->blkg);
+ cfqg_stats_set_start_idle_time(cfqq->cfqg);
cfq_log_cfqq(cfqd, cfqq, "arm_idle: %lu group_idle: %d", sl,
group_idle ? 1 : 0);
}
@@ -2093,8 +2402,7 @@ static void cfq_dispatch_insert(struct request_queue *q, struct request *rq)
cfqd->rq_in_flight[cfq_cfqq_sync(cfqq)]++;
cfqq->nr_sectors += blk_rq_sectors(rq);
- cfq_blkiocg_update_dispatch_stats(&cfqq->cfqg->blkg, blk_rq_bytes(rq),
- rq_data_dir(rq), rq_is_sync(rq));
+ cfqg_stats_update_dispatch(cfqq->cfqg, blk_rq_bytes(rq), rq->cmd_flags);
}
/*
@@ -2677,7 +2985,7 @@ static void cfq_put_queue(struct cfq_queue *cfqq)
BUG_ON(cfq_cfqq_on_rr(cfqq));
kmem_cache_free(cfq_pool, cfqq);
- cfq_put_cfqg(cfqg);
+ cfqg_put(cfqg);
}
static void cfq_put_cooperator(struct cfq_queue *cfqq)
@@ -2736,7 +3044,7 @@ static void cfq_exit_icq(struct io_cq *icq)
}
}
-static void cfq_init_prio_data(struct cfq_queue *cfqq, struct io_context *ioc)
+static void cfq_init_prio_data(struct cfq_queue *cfqq, struct cfq_io_cq *cic)
{
struct task_struct *tsk = current;
int ioprio_class;
@@ -2744,7 +3052,7 @@ static void cfq_init_prio_data(struct cfq_queue *cfqq, struct io_context *ioc)
if (!cfq_cfqq_prio_changed(cfqq))
return;
- ioprio_class = IOPRIO_PRIO_CLASS(ioc->ioprio);
+ ioprio_class = IOPRIO_PRIO_CLASS(cic->ioprio);
switch (ioprio_class) {
default:
printk(KERN_ERR "cfq: bad prio %x\n", ioprio_class);
@@ -2756,11 +3064,11 @@ static void cfq_init_prio_data(struct cfq_queue *cfqq, struct io_context *ioc)
cfqq->ioprio_class = task_nice_ioclass(tsk);
break;
case IOPRIO_CLASS_RT:
- cfqq->ioprio = task_ioprio(ioc);
+ cfqq->ioprio = IOPRIO_PRIO_DATA(cic->ioprio);
cfqq->ioprio_class = IOPRIO_CLASS_RT;
break;
case IOPRIO_CLASS_BE:
- cfqq->ioprio = task_ioprio(ioc);
+ cfqq->ioprio = IOPRIO_PRIO_DATA(cic->ioprio);
cfqq->ioprio_class = IOPRIO_CLASS_BE;
break;
case IOPRIO_CLASS_IDLE:
@@ -2778,19 +3086,24 @@ static void cfq_init_prio_data(struct cfq_queue *cfqq, struct io_context *ioc)
cfq_clear_cfqq_prio_changed(cfqq);
}
-static void changed_ioprio(struct cfq_io_cq *cic)
+static void check_ioprio_changed(struct cfq_io_cq *cic, struct bio *bio)
{
+ int ioprio = cic->icq.ioc->ioprio;
struct cfq_data *cfqd = cic_to_cfqd(cic);
struct cfq_queue *cfqq;
- if (unlikely(!cfqd))
+ /*
+ * Check whether ioprio has changed. The condition may trigger
+ * spuriously on a newly created cic but there's no harm.
+ */
+ if (unlikely(!cfqd) || likely(cic->ioprio == ioprio))
return;
cfqq = cic->cfqq[BLK_RW_ASYNC];
if (cfqq) {
struct cfq_queue *new_cfqq;
- new_cfqq = cfq_get_queue(cfqd, BLK_RW_ASYNC, cic->icq.ioc,
- GFP_ATOMIC);
+ new_cfqq = cfq_get_queue(cfqd, BLK_RW_ASYNC, cic, bio,
+ GFP_ATOMIC);
if (new_cfqq) {
cic->cfqq[BLK_RW_ASYNC] = new_cfqq;
cfq_put_queue(cfqq);
@@ -2800,6 +3113,8 @@ static void changed_ioprio(struct cfq_io_cq *cic)
cfqq = cic->cfqq[BLK_RW_SYNC];
if (cfqq)
cfq_mark_cfqq_prio_changed(cfqq);
+
+ cic->ioprio = ioprio;
}
static void cfq_init_cfqq(struct cfq_data *cfqd, struct cfq_queue *cfqq,
@@ -2823,17 +3138,24 @@ static void cfq_init_cfqq(struct cfq_data *cfqd, struct cfq_queue *cfqq,
}
#ifdef CONFIG_CFQ_GROUP_IOSCHED
-static void changed_cgroup(struct cfq_io_cq *cic)
+static void check_blkcg_changed(struct cfq_io_cq *cic, struct bio *bio)
{
- struct cfq_queue *sync_cfqq = cic_to_cfqq(cic, 1);
struct cfq_data *cfqd = cic_to_cfqd(cic);
- struct request_queue *q;
+ struct cfq_queue *sync_cfqq;
+ uint64_t id;
- if (unlikely(!cfqd))
- return;
+ rcu_read_lock();
+ id = bio_blkcg(bio)->id;
+ rcu_read_unlock();
- q = cfqd->queue;
+ /*
+ * Check whether blkcg has changed. The condition may trigger
+ * spuriously on a newly created cic but there's no harm.
+ */
+ if (unlikely(!cfqd) || likely(cic->blkcg_id == id))
+ return;
+ sync_cfqq = cic_to_cfqq(cic, 1);
if (sync_cfqq) {
/*
* Drop reference to sync queue. A new sync queue will be
@@ -2843,21 +3165,26 @@ static void changed_cgroup(struct cfq_io_cq *cic)
cic_set_cfqq(cic, NULL, 1);
cfq_put_queue(sync_cfqq);
}
+
+ cic->blkcg_id = id;
}
+#else
+static inline void check_blkcg_changed(struct cfq_io_cq *cic, struct bio *bio) { }
#endif /* CONFIG_CFQ_GROUP_IOSCHED */
static struct cfq_queue *
-cfq_find_alloc_queue(struct cfq_data *cfqd, bool is_sync,
- struct io_context *ioc, gfp_t gfp_mask)
+cfq_find_alloc_queue(struct cfq_data *cfqd, bool is_sync, struct cfq_io_cq *cic,
+ struct bio *bio, gfp_t gfp_mask)
{
+ struct blkcg *blkcg;
struct cfq_queue *cfqq, *new_cfqq = NULL;
- struct cfq_io_cq *cic;
struct cfq_group *cfqg;
retry:
- cfqg = cfq_get_cfqg(cfqd);
- cic = cfq_cic_lookup(cfqd, ioc);
- /* cic always exists here */
+ rcu_read_lock();
+
+ blkcg = bio_blkcg(bio);
+ cfqg = cfq_lookup_create_cfqg(cfqd, blkcg);
cfqq = cic_to_cfqq(cic, is_sync);
/*
@@ -2870,6 +3197,7 @@ retry:
cfqq = new_cfqq;
new_cfqq = NULL;
} else if (gfp_mask & __GFP_WAIT) {
+ rcu_read_unlock();
spin_unlock_irq(cfqd->queue->queue_lock);
new_cfqq = kmem_cache_alloc_node(cfq_pool,
gfp_mask | __GFP_ZERO,
@@ -2885,7 +3213,7 @@ retry:
if (cfqq) {
cfq_init_cfqq(cfqd, cfqq, current->pid, is_sync);
- cfq_init_prio_data(cfqq, ioc);
+ cfq_init_prio_data(cfqq, cic);
cfq_link_cfqq_cfqg(cfqq, cfqg);
cfq_log_cfqq(cfqd, cfqq, "alloced");
} else
@@ -2895,6 +3223,7 @@ retry:
if (new_cfqq)
kmem_cache_free(cfq_pool, new_cfqq);
+ rcu_read_unlock();
return cfqq;
}
@@ -2904,6 +3233,9 @@ cfq_async_queue_prio(struct cfq_data *cfqd, int ioprio_class, int ioprio)
switch (ioprio_class) {
case IOPRIO_CLASS_RT:
return &cfqd->async_cfqq[0][ioprio];
+ case IOPRIO_CLASS_NONE:
+ ioprio = IOPRIO_NORM;
+ /* fall through */
case IOPRIO_CLASS_BE:
return &cfqd->async_cfqq[1][ioprio];
case IOPRIO_CLASS_IDLE:
@@ -2914,11 +3246,11 @@ cfq_async_queue_prio(struct cfq_data *cfqd, int ioprio_class, int ioprio)
}
static struct cfq_queue *
-cfq_get_queue(struct cfq_data *cfqd, bool is_sync, struct io_context *ioc,
- gfp_t gfp_mask)
+cfq_get_queue(struct cfq_data *cfqd, bool is_sync, struct cfq_io_cq *cic,
+ struct bio *bio, gfp_t gfp_mask)
{
- const int ioprio = task_ioprio(ioc);
- const int ioprio_class = task_ioprio_class(ioc);
+ const int ioprio_class = IOPRIO_PRIO_CLASS(cic->ioprio);
+ const int ioprio = IOPRIO_PRIO_DATA(cic->ioprio);
struct cfq_queue **async_cfqq = NULL;
struct cfq_queue *cfqq = NULL;
@@ -2928,7 +3260,7 @@ cfq_get_queue(struct cfq_data *cfqd, bool is_sync, struct io_context *ioc,
}
if (!cfqq)
- cfqq = cfq_find_alloc_queue(cfqd, is_sync, ioc, gfp_mask);
+ cfqq = cfq_find_alloc_queue(cfqd, is_sync, cic, bio, gfp_mask);
/*
* pin the queue now that it's allocated, scheduler exit will prune it
@@ -3010,7 +3342,7 @@ cfq_update_idle_window(struct cfq_data *cfqd, struct cfq_queue *cfqq,
if (cfqq->next_rq && (cfqq->next_rq->cmd_flags & REQ_NOIDLE))
enable_idle = 0;
- else if (!atomic_read(&cic->icq.ioc->nr_tasks) ||
+ else if (!atomic_read(&cic->icq.ioc->active_ref) ||
!cfqd->cfq_slice_idle ||
(!cfq_cfqq_deep(cfqq) && CFQQ_SEEKY(cfqq)))
enable_idle = 0;
@@ -3174,8 +3506,7 @@ cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq,
cfq_clear_cfqq_wait_request(cfqq);
__blk_run_queue(cfqd->queue);
} else {
- cfq_blkiocg_update_idle_time_stats(
- &cfqq->cfqg->blkg);
+ cfqg_stats_update_idle_time(cfqq->cfqg);
cfq_mark_cfqq_must_dispatch(cfqq);
}
}
@@ -3197,14 +3528,13 @@ static void cfq_insert_request(struct request_queue *q, struct request *rq)
struct cfq_queue *cfqq = RQ_CFQQ(rq);
cfq_log_cfqq(cfqd, cfqq, "insert_request");
- cfq_init_prio_data(cfqq, RQ_CIC(rq)->icq.ioc);
+ cfq_init_prio_data(cfqq, RQ_CIC(rq));
rq_set_fifo_time(rq, jiffies + cfqd->cfq_fifo_expire[rq_is_sync(rq)]);
list_add_tail(&rq->queuelist, &cfqq->fifo);
cfq_add_rq_rb(rq);
- cfq_blkiocg_update_io_add_stats(&(RQ_CFQG(rq))->blkg,
- &cfqd->serving_group->blkg, rq_data_dir(rq),
- rq_is_sync(rq));
+ cfqg_stats_update_io_add(RQ_CFQG(rq), cfqd->serving_group,
+ rq->cmd_flags);
cfq_rq_enqueued(cfqd, cfqq, rq);
}
@@ -3300,9 +3630,8 @@ static void cfq_completed_request(struct request_queue *q, struct request *rq)
cfqd->rq_in_driver--;
cfqq->dispatched--;
(RQ_CFQG(rq))->dispatched--;
- cfq_blkiocg_update_completion_stats(&cfqq->cfqg->blkg,
- rq_start_time_ns(rq), rq_io_start_time_ns(rq),
- rq_data_dir(rq), rq_is_sync(rq));
+ cfqg_stats_update_completion(cfqq->cfqg, rq_start_time_ns(rq),
+ rq_io_start_time_ns(rq), rq->cmd_flags);
cfqd->rq_in_flight[cfq_cfqq_sync(cfqq)]--;
@@ -3399,7 +3728,7 @@ static int cfq_may_queue(struct request_queue *q, int rw)
cfqq = cic_to_cfqq(cic, rw_is_sync(rw));
if (cfqq) {
- cfq_init_prio_data(cfqq, cic->icq.ioc);
+ cfq_init_prio_data(cfqq, cic);
return __cfq_may_queue(cfqq);
}
@@ -3421,7 +3750,7 @@ static void cfq_put_request(struct request *rq)
cfqq->allocated[rw]--;
/* Put down rq reference on cfqg */
- cfq_put_cfqg(RQ_CFQG(rq));
+ cfqg_put(RQ_CFQG(rq));
rq->elv.priv[0] = NULL;
rq->elv.priv[1] = NULL;
@@ -3465,32 +3794,25 @@ split_cfqq(struct cfq_io_cq *cic, struct cfq_queue *cfqq)
* Allocate cfq data structures associated with this request.
*/
static int
-cfq_set_request(struct request_queue *q, struct request *rq, gfp_t gfp_mask)
+cfq_set_request(struct request_queue *q, struct request *rq, struct bio *bio,
+ gfp_t gfp_mask)
{
struct cfq_data *cfqd = q->elevator->elevator_data;
struct cfq_io_cq *cic = icq_to_cic(rq->elv.icq);
const int rw = rq_data_dir(rq);
const bool is_sync = rq_is_sync(rq);
struct cfq_queue *cfqq;
- unsigned int changed;
might_sleep_if(gfp_mask & __GFP_WAIT);
spin_lock_irq(q->queue_lock);
- /* handle changed notifications */
- changed = icq_get_changed(&cic->icq);
- if (unlikely(changed & ICQ_IOPRIO_CHANGED))
- changed_ioprio(cic);
-#ifdef CONFIG_CFQ_GROUP_IOSCHED
- if (unlikely(changed & ICQ_CGROUP_CHANGED))
- changed_cgroup(cic);
-#endif
-
+ check_ioprio_changed(cic, bio);
+ check_blkcg_changed(cic, bio);
new_queue:
cfqq = cic_to_cfqq(cic, is_sync);
if (!cfqq || cfqq == &cfqd->oom_cfqq) {
- cfqq = cfq_get_queue(cfqd, is_sync, cic->icq.ioc, gfp_mask);
+ cfqq = cfq_get_queue(cfqd, is_sync, cic, bio, gfp_mask);
cic_set_cfqq(cic, cfqq, is_sync);
} else {
/*
@@ -3516,8 +3838,9 @@ new_queue:
cfqq->allocated[rw]++;
cfqq->ref++;
+ cfqg_get(cfqq->cfqg);
rq->elv.priv[0] = cfqq;
- rq->elv.priv[1] = cfq_ref_get_cfqg(cfqq->cfqg);
+ rq->elv.priv[1] = cfqq->cfqg;
spin_unlock_irq(q->queue_lock);
return 0;
}
@@ -3614,7 +3937,6 @@ static void cfq_exit_queue(struct elevator_queue *e)
{
struct cfq_data *cfqd = e->elevator_data;
struct request_queue *q = cfqd->queue;
- bool wait = false;
cfq_shutdown_timer_wq(cfqd);
@@ -3624,89 +3946,52 @@ static void cfq_exit_queue(struct elevator_queue *e)
__cfq_slice_expired(cfqd, cfqd->active_queue, 0);
cfq_put_async_queues(cfqd);
- cfq_release_cfq_groups(cfqd);
-
- /*
- * If there are groups which we could not unlink from blkcg list,
- * wait for a rcu period for them to be freed.
- */
- if (cfqd->nr_blkcg_linked_grps)
- wait = true;
spin_unlock_irq(q->queue_lock);
cfq_shutdown_timer_wq(cfqd);
- /*
- * Wait for cfqg->blkg->key accessors to exit their grace periods.
- * Do this wait only if there are other unlinked groups out
- * there. This can happen if cgroup deletion path claimed the
- * responsibility of cleaning up a group before queue cleanup code
- * get to the group.
- *
- * Do not call synchronize_rcu() unconditionally as there are drivers
- * which create/delete request queue hundreds of times during scan/boot
- * and synchronize_rcu() can take significant time and slow down boot.
- */
- if (wait)
- synchronize_rcu();
-
-#ifdef CONFIG_CFQ_GROUP_IOSCHED
- /* Free up per cpu stats for root group */
- free_percpu(cfqd->root_group.blkg.stats_cpu);
+#ifndef CONFIG_CFQ_GROUP_IOSCHED
+ kfree(cfqd->root_group);
#endif
+ blkcg_deactivate_policy(q, &blkcg_policy_cfq);
kfree(cfqd);
}
-static void *cfq_init_queue(struct request_queue *q)
+static int cfq_init_queue(struct request_queue *q)
{
struct cfq_data *cfqd;
- int i, j;
- struct cfq_group *cfqg;
- struct cfq_rb_root *st;
+ struct blkcg_gq *blkg __maybe_unused;
+ int i, ret;
cfqd = kmalloc_node(sizeof(*cfqd), GFP_KERNEL | __GFP_ZERO, q->node);
if (!cfqd)
- return NULL;
+ return -ENOMEM;
+
+ cfqd->queue = q;
+ q->elevator->elevator_data = cfqd;
/* Init root service tree */
cfqd->grp_service_tree = CFQ_RB_ROOT;
- /* Init root group */
- cfqg = &cfqd->root_group;
- for_each_cfqg_st(cfqg, i, j, st)
- *st = CFQ_RB_ROOT;
- RB_CLEAR_NODE(&cfqg->rb_node);
-
- /* Give preference to root group over other groups */
- cfqg->weight = 2*BLKIO_WEIGHT_DEFAULT;
-
+ /* Init root group and prefer root group over other groups by default */
#ifdef CONFIG_CFQ_GROUP_IOSCHED
- /*
- * Set root group reference to 2. One reference will be dropped when
- * all groups on cfqd->cfqg_list are being deleted during queue exit.
- * Other reference will remain there as we don't want to delete this
- * group as it is statically allocated and gets destroyed when
- * throtl_data goes away.
- */
- cfqg->ref = 2;
-
- if (blkio_alloc_blkg_stats(&cfqg->blkg)) {
- kfree(cfqg);
- kfree(cfqd);
- return NULL;
- }
-
- rcu_read_lock();
+ ret = blkcg_activate_policy(q, &blkcg_policy_cfq);
+ if (ret)
+ goto out_free;
- cfq_blkiocg_add_blkio_group(&blkio_root_cgroup, &cfqg->blkg,
- (void *)cfqd, 0);
- rcu_read_unlock();
- cfqd->nr_blkcg_linked_grps++;
+ cfqd->root_group = blkg_to_cfqg(q->root_blkg);
+#else
+ ret = -ENOMEM;
+ cfqd->root_group = kzalloc_node(sizeof(*cfqd->root_group),
+ GFP_KERNEL, cfqd->queue->node);
+ if (!cfqd->root_group)
+ goto out_free;
- /* Add group on cfqd->cfqg_list */
- hlist_add_head(&cfqg->cfqd_node, &cfqd->cfqg_list);
+ cfq_init_cfqg_base(cfqd->root_group);
#endif
+ cfqd->root_group->weight = 2 * CFQ_WEIGHT_DEFAULT;
+
/*
* Not strictly needed (since RB_ROOT just clears the node and we
* zeroed cfqd on alloc), but better be safe in case someone decides
@@ -3718,13 +4003,17 @@ static void *cfq_init_queue(struct request_queue *q)
/*
* Our fallback cfqq if cfq_find_alloc_queue() runs into OOM issues.
* Grab a permanent reference to it, so that the normal code flow
- * will not attempt to free it.
+ * will not attempt to free it. oom_cfqq is linked to root_group
+ * but shouldn't hold a reference as it'll never be unlinked. Lose
+ * the reference from linking right away.
*/
cfq_init_cfqq(cfqd, &cfqd->oom_cfqq, 1, 0);
cfqd->oom_cfqq.ref++;
- cfq_link_cfqq_cfqg(&cfqd->oom_cfqq, &cfqd->root_group);
- cfqd->queue = q;
+ spin_lock_irq(q->queue_lock);
+ cfq_link_cfqq_cfqg(&cfqd->oom_cfqq, cfqd->root_group);
+ cfqg_put(cfqd->root_group);
+ spin_unlock_irq(q->queue_lock);
init_timer(&cfqd->idle_slice_timer);
cfqd->idle_slice_timer.function = cfq_idle_slice_timer;
@@ -3750,7 +4039,11 @@ static void *cfq_init_queue(struct request_queue *q)
* second, in order to have larger depth for async operations.
*/
cfqd->last_delayed_sync = jiffies - HZ;
- return cfqd;
+ return 0;
+
+out_free:
+ kfree(cfqd);
+ return ret;
}
/*
@@ -3877,15 +4170,13 @@ static struct elevator_type iosched_cfq = {
};
#ifdef CONFIG_CFQ_GROUP_IOSCHED
-static struct blkio_policy_type blkio_policy_cfq = {
- .ops = {
- .blkio_unlink_group_fn = cfq_unlink_blkio_group,
- .blkio_update_group_weight_fn = cfq_update_blkio_group_weight,
- },
- .plid = BLKIO_POLICY_PROP,
+static struct blkcg_policy blkcg_policy_cfq = {
+ .pd_size = sizeof(struct cfq_group),
+ .cftypes = cfq_blkcg_files,
+
+ .pd_init_fn = cfq_pd_init,
+ .pd_reset_stats_fn = cfq_pd_reset_stats,
};
-#else
-static struct blkio_policy_type blkio_policy_cfq;
#endif
static int __init cfq_init(void)
@@ -3906,24 +4197,31 @@ static int __init cfq_init(void)
#else
cfq_group_idle = 0;
#endif
+
+ ret = blkcg_policy_register(&blkcg_policy_cfq);
+ if (ret)
+ return ret;
+
cfq_pool = KMEM_CACHE(cfq_queue, 0);
if (!cfq_pool)
- return -ENOMEM;
+ goto err_pol_unreg;
ret = elv_register(&iosched_cfq);
- if (ret) {
- kmem_cache_destroy(cfq_pool);
- return ret;
- }
-
- blkio_policy_register(&blkio_policy_cfq);
+ if (ret)
+ goto err_free_pool;
return 0;
+
+err_free_pool:
+ kmem_cache_destroy(cfq_pool);
+err_pol_unreg:
+ blkcg_policy_unregister(&blkcg_policy_cfq);
+ return ret;
}
static void __exit cfq_exit(void)
{
- blkio_policy_unregister(&blkio_policy_cfq);
+ blkcg_policy_unregister(&blkcg_policy_cfq);
elv_unregister(&iosched_cfq);
kmem_cache_destroy(cfq_pool);
}
diff --git a/block/cfq.h b/block/cfq.h
deleted file mode 100644
index 2a155927e37..00000000000
--- a/block/cfq.h
+++ /dev/null
@@ -1,115 +0,0 @@
-#ifndef _CFQ_H
-#define _CFQ_H
-#include "blk-cgroup.h"
-
-#ifdef CONFIG_CFQ_GROUP_IOSCHED
-static inline void cfq_blkiocg_update_io_add_stats(struct blkio_group *blkg,
- struct blkio_group *curr_blkg, bool direction, bool sync)
-{
- blkiocg_update_io_add_stats(blkg, curr_blkg, direction, sync);
-}
-
-static inline void cfq_blkiocg_update_dequeue_stats(struct blkio_group *blkg,
- unsigned long dequeue)
-{
- blkiocg_update_dequeue_stats(blkg, dequeue);
-}
-
-static inline void cfq_blkiocg_update_timeslice_used(struct blkio_group *blkg,
- unsigned long time, unsigned long unaccounted_time)
-{
- blkiocg_update_timeslice_used(blkg, time, unaccounted_time);
-}
-
-static inline void cfq_blkiocg_set_start_empty_time(struct blkio_group *blkg)
-{
- blkiocg_set_start_empty_time(blkg);
-}
-
-static inline void cfq_blkiocg_update_io_remove_stats(struct blkio_group *blkg,
- bool direction, bool sync)
-{
- blkiocg_update_io_remove_stats(blkg, direction, sync);
-}
-
-static inline void cfq_blkiocg_update_io_merged_stats(struct blkio_group *blkg,
- bool direction, bool sync)
-{
- blkiocg_update_io_merged_stats(blkg, direction, sync);
-}
-
-static inline void cfq_blkiocg_update_idle_time_stats(struct blkio_group *blkg)
-{
- blkiocg_update_idle_time_stats(blkg);
-}
-
-static inline void
-cfq_blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg)
-{
- blkiocg_update_avg_queue_size_stats(blkg);
-}
-
-static inline void
-cfq_blkiocg_update_set_idle_time_stats(struct blkio_group *blkg)
-{
- blkiocg_update_set_idle_time_stats(blkg);
-}
-
-static inline void cfq_blkiocg_update_dispatch_stats(struct blkio_group *blkg,
- uint64_t bytes, bool direction, bool sync)
-{
- blkiocg_update_dispatch_stats(blkg, bytes, direction, sync);
-}
-
-static inline void cfq_blkiocg_update_completion_stats(struct blkio_group *blkg, uint64_t start_time, uint64_t io_start_time, bool direction, bool sync)
-{
- blkiocg_update_completion_stats(blkg, start_time, io_start_time,
- direction, sync);
-}
-
-static inline void cfq_blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
- struct blkio_group *blkg, void *key, dev_t dev) {
- blkiocg_add_blkio_group(blkcg, blkg, key, dev, BLKIO_POLICY_PROP);
-}
-
-static inline int cfq_blkiocg_del_blkio_group(struct blkio_group *blkg)
-{
- return blkiocg_del_blkio_group(blkg);
-}
-
-#else /* CFQ_GROUP_IOSCHED */
-static inline void cfq_blkiocg_update_io_add_stats(struct blkio_group *blkg,
- struct blkio_group *curr_blkg, bool direction, bool sync) {}
-
-static inline void cfq_blkiocg_update_dequeue_stats(struct blkio_group *blkg,
- unsigned long dequeue) {}
-
-static inline void cfq_blkiocg_update_timeslice_used(struct blkio_group *blkg,
- unsigned long time, unsigned long unaccounted_time) {}
-static inline void cfq_blkiocg_set_start_empty_time(struct blkio_group *blkg) {}
-static inline void cfq_blkiocg_update_io_remove_stats(struct blkio_group *blkg,
- bool direction, bool sync) {}
-static inline void cfq_blkiocg_update_io_merged_stats(struct blkio_group *blkg,
- bool direction, bool sync) {}
-static inline void cfq_blkiocg_update_idle_time_stats(struct blkio_group *blkg)
-{
-}
-static inline void
-cfq_blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg) {}
-
-static inline void
-cfq_blkiocg_update_set_idle_time_stats(struct blkio_group *blkg) {}
-
-static inline void cfq_blkiocg_update_dispatch_stats(struct blkio_group *blkg,
- uint64_t bytes, bool direction, bool sync) {}
-static inline void cfq_blkiocg_update_completion_stats(struct blkio_group *blkg, uint64_t start_time, uint64_t io_start_time, bool direction, bool sync) {}
-
-static inline void cfq_blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
- struct blkio_group *blkg, void *key, dev_t dev) {}
-static inline int cfq_blkiocg_del_blkio_group(struct blkio_group *blkg)
-{
- return 0;
-}
-
-#endif /* CFQ_GROUP_IOSCHED */
-#endif
diff --git a/block/deadline-iosched.c b/block/deadline-iosched.c
index 7bf12d793fc..599b12e5380 100644
--- a/block/deadline-iosched.c
+++ b/block/deadline-iosched.c
@@ -337,13 +337,13 @@ static void deadline_exit_queue(struct elevator_queue *e)
/*
* initialize elevator private data (deadline_data).
*/
-static void *deadline_init_queue(struct request_queue *q)
+static int deadline_init_queue(struct request_queue *q)
{
struct deadline_data *dd;
dd = kmalloc_node(sizeof(*dd), GFP_KERNEL | __GFP_ZERO, q->node);
if (!dd)
- return NULL;
+ return -ENOMEM;
INIT_LIST_HEAD(&dd->fifo_list[READ]);
INIT_LIST_HEAD(&dd->fifo_list[WRITE]);
@@ -354,7 +354,9 @@ static void *deadline_init_queue(struct request_queue *q)
dd->writes_starved = writes_starved;
dd->front_merges = 1;
dd->fifo_batch = fifo_batch;
- return dd;
+
+ q->elevator->elevator_data = dd;
+ return 0;
}
/*
diff --git a/block/elevator.c b/block/elevator.c
index f016855a46b..6a55d418896 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -38,6 +38,7 @@
#include <trace/events/block.h>
#include "blk.h"
+#include "blk-cgroup.h"
static DEFINE_SPINLOCK(elv_list_lock);
static LIST_HEAD(elv_list);
@@ -121,15 +122,6 @@ static struct elevator_type *elevator_get(const char *name)
return e;
}
-static int elevator_init_queue(struct request_queue *q,
- struct elevator_queue *eq)
-{
- eq->elevator_data = eq->type->ops.elevator_init_fn(q);
- if (eq->elevator_data)
- return 0;
- return -ENOMEM;
-}
-
static char chosen_elevator[ELV_NAME_MAX];
static int __init elevator_setup(char *str)
@@ -188,7 +180,6 @@ static void elevator_release(struct kobject *kobj)
int elevator_init(struct request_queue *q, char *name)
{
struct elevator_type *e = NULL;
- struct elevator_queue *eq;
int err;
if (unlikely(q->elevator))
@@ -222,17 +213,16 @@ int elevator_init(struct request_queue *q, char *name)
}
}
- eq = elevator_alloc(q, e);
- if (!eq)
+ q->elevator = elevator_alloc(q, e);
+ if (!q->elevator)
return -ENOMEM;
- err = elevator_init_queue(q, eq);
+ err = e->ops.elevator_init_fn(q);
if (err) {
- kobject_put(&eq->kobj);
+ kobject_put(&q->elevator->kobj);
return err;
}
- q->elevator = eq;
return 0;
}
EXPORT_SYMBOL(elevator_init);
@@ -564,25 +554,6 @@ void elv_drain_elevator(struct request_queue *q)
}
}
-void elv_quiesce_start(struct request_queue *q)
-{
- if (!q->elevator)
- return;
-
- spin_lock_irq(q->queue_lock);
- queue_flag_set(QUEUE_FLAG_ELVSWITCH, q);
- spin_unlock_irq(q->queue_lock);
-
- blk_drain_queue(q, false);
-}
-
-void elv_quiesce_end(struct request_queue *q)
-{
- spin_lock_irq(q->queue_lock);
- queue_flag_clear(QUEUE_FLAG_ELVSWITCH, q);
- spin_unlock_irq(q->queue_lock);
-}
-
void __elv_add_request(struct request_queue *q, struct request *rq, int where)
{
trace_block_rq_insert(q, rq);
@@ -692,12 +663,13 @@ struct request *elv_former_request(struct request_queue *q, struct request *rq)
return NULL;
}
-int elv_set_request(struct request_queue *q, struct request *rq, gfp_t gfp_mask)
+int elv_set_request(struct request_queue *q, struct request *rq,
+ struct bio *bio, gfp_t gfp_mask)
{
struct elevator_queue *e = q->elevator;
if (e->type->ops.elevator_set_req_fn)
- return e->type->ops.elevator_set_req_fn(q, rq, gfp_mask);
+ return e->type->ops.elevator_set_req_fn(q, rq, bio, gfp_mask);
return 0;
}
@@ -801,8 +773,9 @@ static struct kobj_type elv_ktype = {
.release = elevator_release,
};
-int __elv_register_queue(struct request_queue *q, struct elevator_queue *e)
+int elv_register_queue(struct request_queue *q)
{
+ struct elevator_queue *e = q->elevator;
int error;
error = kobject_add(&e->kobj, &q->kobj, "%s", "iosched");
@@ -820,11 +793,6 @@ int __elv_register_queue(struct request_queue *q, struct elevator_queue *e)
}
return error;
}
-
-int elv_register_queue(struct request_queue *q)
-{
- return __elv_register_queue(q, q->elevator);
-}
EXPORT_SYMBOL(elv_register_queue);
void elv_unregister_queue(struct request_queue *q)
@@ -907,53 +875,60 @@ EXPORT_SYMBOL_GPL(elv_unregister);
*/
static int elevator_switch(struct request_queue *q, struct elevator_type *new_e)
{
- struct elevator_queue *old_elevator, *e;
+ struct elevator_queue *old = q->elevator;
+ bool registered = old->registered;
int err;
- /* allocate new elevator */
- e = elevator_alloc(q, new_e);
- if (!e)
- return -ENOMEM;
+ /*
+ * Turn on BYPASS and drain all requests w/ elevator private data.
+ * Block layer doesn't call into a quiesced elevator - all requests
+ * are directly put on the dispatch list without elevator data
+ * using INSERT_BACK. All requests have SOFTBARRIER set and no
+ * merge happens either.
+ */
+ blk_queue_bypass_start(q);
+
+ /* unregister and clear all auxiliary data of the old elevator */
+ if (registered)
+ elv_unregister_queue(q);
+
+ spin_lock_irq(q->queue_lock);
+ ioc_clear_queue(q);
+ spin_unlock_irq(q->queue_lock);
- err = elevator_init_queue(q, e);
+ /* allocate, init and register new elevator */
+ err = -ENOMEM;
+ q->elevator = elevator_alloc(q, new_e);
+ if (!q->elevator)
+ goto fail_init;
+
+ err = new_e->ops.elevator_init_fn(q);
if (err) {
- kobject_put(&e->kobj);
- return err;
+ kobject_put(&q->elevator->kobj);
+ goto fail_init;
}
- /* turn on BYPASS and drain all requests w/ elevator private data */
- elv_quiesce_start(q);
-
- /* unregister old queue, register new one and kill old elevator */
- if (q->elevator->registered) {
- elv_unregister_queue(q);
- err = __elv_register_queue(q, e);
+ if (registered) {
+ err = elv_register_queue(q);
if (err)
goto fail_register;
}
- /* done, clear io_cq's, switch elevators and turn off BYPASS */
- spin_lock_irq(q->queue_lock);
- ioc_clear_queue(q);
- old_elevator = q->elevator;
- q->elevator = e;
- spin_unlock_irq(q->queue_lock);
-
- elevator_exit(old_elevator);
- elv_quiesce_end(q);
+ /* done, kill the old one and finish */
+ elevator_exit(old);
+ blk_queue_bypass_end(q);
- blk_add_trace_msg(q, "elv switch: %s", e->type->elevator_name);
+ blk_add_trace_msg(q, "elv switch: %s", new_e->elevator_name);
return 0;
fail_register:
- /*
- * switch failed, exit the new io scheduler and reattach the old
- * one again (along with re-adding the sysfs dir)
- */
- elevator_exit(e);
+ elevator_exit(q->elevator);
+fail_init:
+ /* switch failed, restore and re-register old elevator */
+ q->elevator = old;
elv_register_queue(q);
- elv_quiesce_end(q);
+ blk_queue_bypass_end(q);
return err;
}
diff --git a/block/noop-iosched.c b/block/noop-iosched.c
index 413a0b1d788..5d1bf70e33d 100644
--- a/block/noop-iosched.c
+++ b/block/noop-iosched.c
@@ -59,15 +59,17 @@ noop_latter_request(struct request_queue *q, struct request *rq)
return list_entry(rq->queuelist.next, struct request, queuelist);
}
-static void *noop_init_queue(struct request_queue *q)
+static int noop_init_queue(struct request_queue *q)
{
struct noop_data *nd;
nd = kmalloc_node(sizeof(*nd), GFP_KERNEL, q->node);
if (!nd)
- return NULL;
+ return -ENOMEM;
+
INIT_LIST_HEAD(&nd->queue);
- return nd;
+ q->elevator->elevator_data = nd;
+ return 0;
}
static void noop_exit_queue(struct elevator_queue *e)
diff --git a/drivers/block/drbd/drbd_actlog.c b/drivers/block/drbd/drbd_actlog.c
index cf0e63dd97d..e54e31b02b8 100644
--- a/drivers/block/drbd/drbd_actlog.c
+++ b/drivers/block/drbd/drbd_actlog.c
@@ -65,39 +65,80 @@ struct drbd_atodb_wait {
int w_al_write_transaction(struct drbd_conf *, struct drbd_work *, int);
+void *drbd_md_get_buffer(struct drbd_conf *mdev)
+{
+ int r;
+
+ wait_event(mdev->misc_wait,
+ (r = atomic_cmpxchg(&mdev->md_io_in_use, 0, 1)) == 0 ||
+ mdev->state.disk <= D_FAILED);
+
+ return r ? NULL : page_address(mdev->md_io_page);
+}
+
+void drbd_md_put_buffer(struct drbd_conf *mdev)
+{
+ if (atomic_dec_and_test(&mdev->md_io_in_use))
+ wake_up(&mdev->misc_wait);
+}
+
+static bool md_io_allowed(struct drbd_conf *mdev)
+{
+ enum drbd_disk_state ds = mdev->state.disk;
+ return ds >= D_NEGOTIATING || ds == D_ATTACHING;
+}
+
+void wait_until_done_or_disk_failure(struct drbd_conf *mdev, struct drbd_backing_dev *bdev,
+ unsigned int *done)
+{
+ long dt = bdev->dc.disk_timeout * HZ / 10;
+ if (dt == 0)
+ dt = MAX_SCHEDULE_TIMEOUT;
+
+ dt = wait_event_timeout(mdev->misc_wait, *done || !md_io_allowed(mdev), dt);
+ if (dt == 0)
+ dev_err(DEV, "meta-data IO operation timed out\n");
+}
+
static int _drbd_md_sync_page_io(struct drbd_conf *mdev,
struct drbd_backing_dev *bdev,
struct page *page, sector_t sector,
int rw, int size)
{
struct bio *bio;
- struct drbd_md_io md_io;
int ok;
- md_io.mdev = mdev;
- init_completion(&md_io.event);
- md_io.error = 0;
+ mdev->md_io.done = 0;
+ mdev->md_io.error = -ENODEV;
if ((rw & WRITE) && !test_bit(MD_NO_FUA, &mdev->flags))
rw |= REQ_FUA | REQ_FLUSH;
rw |= REQ_SYNC;
- bio = bio_alloc(GFP_NOIO, 1);
+ bio = bio_alloc_drbd(GFP_NOIO);
bio->bi_bdev = bdev->md_bdev;
bio->bi_sector = sector;
ok = (bio_add_page(bio, page, size, 0) == size);
if (!ok)
goto out;
- bio->bi_private = &md_io;
+ bio->bi_private = &mdev->md_io;
bio->bi_end_io = drbd_md_io_complete;
bio->bi_rw = rw;
+ if (!get_ldev_if_state(mdev, D_ATTACHING)) { /* Corresponding put_ldev in drbd_md_io_complete() */
+ dev_err(DEV, "ASSERT FAILED: get_ldev_if_state() == 1 in _drbd_md_sync_page_io()\n");
+ ok = 0;
+ goto out;
+ }
+
+ bio_get(bio); /* one bio_put() is in the completion handler */
+ atomic_inc(&mdev->md_io_in_use); /* drbd_md_put_buffer() is in the completion handler */
if (drbd_insert_fault(mdev, (rw & WRITE) ? DRBD_FAULT_MD_WR : DRBD_FAULT_MD_RD))
bio_endio(bio, -EIO);
else
submit_bio(rw, bio);
- wait_for_completion(&md_io.event);
- ok = bio_flagged(bio, BIO_UPTODATE) && md_io.error == 0;
+ wait_until_done_or_disk_failure(mdev, bdev, &mdev->md_io.done);
+ ok = bio_flagged(bio, BIO_UPTODATE) && mdev->md_io.error == 0;
out:
bio_put(bio);
@@ -111,7 +152,7 @@ int drbd_md_sync_page_io(struct drbd_conf *mdev, struct drbd_backing_dev *bdev,
int offset = 0;
struct page *iop = mdev->md_io_page;
- D_ASSERT(mutex_is_locked(&mdev->md_io_mutex));
+ D_ASSERT(atomic_read(&mdev->md_io_in_use) == 1);
BUG_ON(!bdev->md_bdev);
@@ -328,8 +369,13 @@ w_al_write_transaction(struct drbd_conf *mdev, struct drbd_work *w, int unused)
return 1;
}
- mutex_lock(&mdev->md_io_mutex); /* protects md_io_buffer, al_tr_cycle, ... */
- buffer = (struct al_transaction *)page_address(mdev->md_io_page);
+ buffer = drbd_md_get_buffer(mdev); /* protects md_io_buffer, al_tr_cycle, ... */
+ if (!buffer) {
+ dev_err(DEV, "disk failed while waiting for md_io buffer\n");
+ complete(&((struct update_al_work *)w)->event);
+ put_ldev(mdev);
+ return 1;
+ }
buffer->magic = __constant_cpu_to_be32(DRBD_MAGIC);
buffer->tr_number = cpu_to_be32(mdev->al_tr_number);
@@ -374,7 +420,7 @@ w_al_write_transaction(struct drbd_conf *mdev, struct drbd_work *w, int unused)
D_ASSERT(mdev->al_tr_pos < MD_AL_MAX_SIZE);
mdev->al_tr_number++;
- mutex_unlock(&mdev->md_io_mutex);
+ drbd_md_put_buffer(mdev);
complete(&((struct update_al_work *)w)->event);
put_ldev(mdev);
@@ -443,8 +489,9 @@ int drbd_al_read_log(struct drbd_conf *mdev, struct drbd_backing_dev *bdev)
/* lock out all other meta data io for now,
* and make sure the page is mapped.
*/
- mutex_lock(&mdev->md_io_mutex);
- buffer = page_address(mdev->md_io_page);
+ buffer = drbd_md_get_buffer(mdev);
+ if (!buffer)
+ return 0;
/* Find the valid transaction in the log */
for (i = 0; i <= mx; i++) {
@@ -452,7 +499,7 @@ int drbd_al_read_log(struct drbd_conf *mdev, struct drbd_backing_dev *bdev)
if (rv == 0)
continue;
if (rv == -1) {
- mutex_unlock(&mdev->md_io_mutex);
+ drbd_md_put_buffer(mdev);
return 0;
}
cnr = be32_to_cpu(buffer->tr_number);
@@ -478,7 +525,7 @@ int drbd_al_read_log(struct drbd_conf *mdev, struct drbd_backing_dev *bdev)
if (!found_valid) {
dev_warn(DEV, "No usable activity log found.\n");
- mutex_unlock(&mdev->md_io_mutex);
+ drbd_md_put_buffer(mdev);
return 1;
}
@@ -493,7 +540,7 @@ int drbd_al_read_log(struct drbd_conf *mdev, struct drbd_backing_dev *bdev)
rv = drbd_al_read_tr(mdev, bdev, buffer, i);
ERR_IF(rv == 0) goto cancel;
if (rv == -1) {
- mutex_unlock(&mdev->md_io_mutex);
+ drbd_md_put_buffer(mdev);
return 0;
}
@@ -534,7 +581,7 @@ cancel:
mdev->al_tr_pos = 0;
/* ok, we are done with it */
- mutex_unlock(&mdev->md_io_mutex);
+ drbd_md_put_buffer(mdev);
dev_info(DEV, "Found %d transactions (%d active extents) in activity log.\n",
transactions, active_extents);
@@ -671,16 +718,20 @@ static void drbd_try_clear_on_disk_bm(struct drbd_conf *mdev, sector_t sector,
else
ext->rs_failed += count;
if (ext->rs_left < ext->rs_failed) {
- dev_err(DEV, "BAD! sector=%llus enr=%u rs_left=%d "
- "rs_failed=%d count=%d\n",
+ dev_warn(DEV, "BAD! sector=%llus enr=%u rs_left=%d "
+ "rs_failed=%d count=%d cstate=%s\n",
(unsigned long long)sector,
ext->lce.lc_number, ext->rs_left,
- ext->rs_failed, count);
- dump_stack();
-
- lc_put(mdev->resync, &ext->lce);
- drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
- return;
+ ext->rs_failed, count,
+ drbd_conn_str(mdev->state.conn));
+
+ /* We don't expect to be able to clear more bits
+ * than have been set when we originally counted
+ * the set bits to cache that value in ext->rs_left.
+ * Whatever the reason (disconnect during resync,
+ * delayed local completion of an application write),
+ * try to fix it up by recounting here. */
+ ext->rs_left = drbd_bm_e_weight(mdev, enr);
}
} else {
/* Normally this element should be in the cache,
@@ -1192,6 +1243,7 @@ int drbd_rs_del_all(struct drbd_conf *mdev)
put_ldev(mdev);
}
spin_unlock_irq(&mdev->al_lock);
+ wake_up(&mdev->al_wait);
return 0;
}
diff --git a/drivers/block/drbd/drbd_bitmap.c b/drivers/block/drbd/drbd_bitmap.c
index 3030201c69d..b5c5ff53cb5 100644
--- a/drivers/block/drbd/drbd_bitmap.c
+++ b/drivers/block/drbd/drbd_bitmap.c
@@ -205,7 +205,7 @@ void drbd_bm_unlock(struct drbd_conf *mdev)
static void bm_store_page_idx(struct page *page, unsigned long idx)
{
BUG_ON(0 != (idx & ~BM_PAGE_IDX_MASK));
- page_private(page) |= idx;
+ set_page_private(page, idx);
}
static unsigned long bm_page_to_idx(struct page *page)
@@ -886,12 +886,21 @@ void drbd_bm_clear_all(struct drbd_conf *mdev)
struct bm_aio_ctx {
struct drbd_conf *mdev;
atomic_t in_flight;
- struct completion done;
+ unsigned int done;
unsigned flags;
#define BM_AIO_COPY_PAGES 1
int error;
+ struct kref kref;
};
+static void bm_aio_ctx_destroy(struct kref *kref)
+{
+ struct bm_aio_ctx *ctx = container_of(kref, struct bm_aio_ctx, kref);
+
+ put_ldev(ctx->mdev);
+ kfree(ctx);
+}
+
/* bv_page may be a copy, or may be the original */
static void bm_async_io_complete(struct bio *bio, int error)
{
@@ -930,20 +939,21 @@ static void bm_async_io_complete(struct bio *bio, int error)
bm_page_unlock_io(mdev, idx);
- /* FIXME give back to page pool */
if (ctx->flags & BM_AIO_COPY_PAGES)
- put_page(bio->bi_io_vec[0].bv_page);
+ mempool_free(bio->bi_io_vec[0].bv_page, drbd_md_io_page_pool);
bio_put(bio);
- if (atomic_dec_and_test(&ctx->in_flight))
- complete(&ctx->done);
+ if (atomic_dec_and_test(&ctx->in_flight)) {
+ ctx->done = 1;
+ wake_up(&mdev->misc_wait);
+ kref_put(&ctx->kref, &bm_aio_ctx_destroy);
+ }
}
static void bm_page_io_async(struct bm_aio_ctx *ctx, int page_nr, int rw) __must_hold(local)
{
- /* we are process context. we always get a bio */
- struct bio *bio = bio_alloc(GFP_KERNEL, 1);
+ struct bio *bio = bio_alloc_drbd(GFP_NOIO);
struct drbd_conf *mdev = ctx->mdev;
struct drbd_bitmap *b = mdev->bitmap;
struct page *page;
@@ -966,10 +976,8 @@ static void bm_page_io_async(struct bm_aio_ctx *ctx, int page_nr, int rw) __must
bm_set_page_unchanged(b->bm_pages[page_nr]);
if (ctx->flags & BM_AIO_COPY_PAGES) {
- /* FIXME alloc_page is good enough for now, but actually needs
- * to use pre-allocated page pool */
void *src, *dest;
- page = alloc_page(__GFP_HIGHMEM|__GFP_WAIT);
+ page = mempool_alloc(drbd_md_io_page_pool, __GFP_HIGHMEM|__GFP_WAIT);
dest = kmap_atomic(page);
src = kmap_atomic(b->bm_pages[page_nr]);
memcpy(dest, src, PAGE_SIZE);
@@ -981,6 +989,8 @@ static void bm_page_io_async(struct bm_aio_ctx *ctx, int page_nr, int rw) __must
bio->bi_bdev = mdev->ldev->md_bdev;
bio->bi_sector = on_disk_sector;
+ /* bio_add_page of a single page to an empty bio will always succeed,
+ * according to api. Do we want to assert that? */
bio_add_page(bio, page, len, 0);
bio->bi_private = ctx;
bio->bi_end_io = bm_async_io_complete;
@@ -999,14 +1009,9 @@ static void bm_page_io_async(struct bm_aio_ctx *ctx, int page_nr, int rw) __must
/*
* bm_rw: read/write the whole bitmap from/to its on disk location.
*/
-static int bm_rw(struct drbd_conf *mdev, int rw, unsigned lazy_writeout_upper_idx) __must_hold(local)
+static int bm_rw(struct drbd_conf *mdev, int rw, unsigned flags, unsigned lazy_writeout_upper_idx) __must_hold(local)
{
- struct bm_aio_ctx ctx = {
- .mdev = mdev,
- .in_flight = ATOMIC_INIT(1),
- .done = COMPLETION_INITIALIZER_ONSTACK(ctx.done),
- .flags = lazy_writeout_upper_idx ? BM_AIO_COPY_PAGES : 0,
- };
+ struct bm_aio_ctx *ctx;
struct drbd_bitmap *b = mdev->bitmap;
int num_pages, i, count = 0;
unsigned long now;
@@ -1021,7 +1026,27 @@ static int bm_rw(struct drbd_conf *mdev, int rw, unsigned lazy_writeout_upper_id
* For lazy writeout, we don't care for ongoing changes to the bitmap,
* as we submit copies of pages anyways.
*/
- if (!ctx.flags)
+
+ ctx = kmalloc(sizeof(struct bm_aio_ctx), GFP_NOIO);
+ if (!ctx)
+ return -ENOMEM;
+
+ *ctx = (struct bm_aio_ctx) {
+ .mdev = mdev,
+ .in_flight = ATOMIC_INIT(1),
+ .done = 0,
+ .flags = flags,
+ .error = 0,
+ .kref = { ATOMIC_INIT(2) },
+ };
+
+ if (!get_ldev_if_state(mdev, D_ATTACHING)) { /* put is in bm_aio_ctx_destroy() */
+ dev_err(DEV, "ASSERT FAILED: get_ldev_if_state() == 1 in bm_rw()\n");
+ kfree(ctx);
+ return -ENODEV;
+ }
+
+ if (!ctx->flags)
WARN_ON(!(BM_LOCKED_MASK & b->bm_flags));
num_pages = b->bm_number_of_pages;
@@ -1046,29 +1071,38 @@ static int bm_rw(struct drbd_conf *mdev, int rw, unsigned lazy_writeout_upper_id
continue;
}
}
- atomic_inc(&ctx.in_flight);
- bm_page_io_async(&ctx, i, rw);
+ atomic_inc(&ctx->in_flight);
+ bm_page_io_async(ctx, i, rw);
++count;
cond_resched();
}
/*
- * We initialize ctx.in_flight to one to make sure bm_async_io_complete
- * will not complete() early, and decrement / test it here. If there
+ * We initialize ctx->in_flight to one to make sure bm_async_io_complete
+ * will not set ctx->done early, and decrement / test it here. If there
* are still some bios in flight, we need to wait for them here.
+ * If all IO is done already (or nothing had been submitted), there is
+ * no need to wait. Still, we need to put the kref associated with the
+ * "in_flight reached zero, all done" event.
*/
- if (!atomic_dec_and_test(&ctx.in_flight))
- wait_for_completion(&ctx.done);
+ if (!atomic_dec_and_test(&ctx->in_flight))
+ wait_until_done_or_disk_failure(mdev, mdev->ldev, &ctx->done);
+ else
+ kref_put(&ctx->kref, &bm_aio_ctx_destroy);
+
dev_info(DEV, "bitmap %s of %u pages took %lu jiffies\n",
rw == WRITE ? "WRITE" : "READ",
count, jiffies - now);
- if (ctx.error) {
+ if (ctx->error) {
dev_alert(DEV, "we had at least one MD IO ERROR during bitmap IO\n");
drbd_chk_io_error(mdev, 1, true);
- err = -EIO; /* ctx.error ? */
+ err = -EIO; /* ctx->error ? */
}
+ if (atomic_read(&ctx->in_flight))
+ err = -EIO; /* Disk failed during IO... */
+
now = jiffies;
if (rw == WRITE) {
drbd_md_flush(mdev);
@@ -1082,6 +1116,7 @@ static int bm_rw(struct drbd_conf *mdev, int rw, unsigned lazy_writeout_upper_id
dev_info(DEV, "%s (%lu bits) marked out-of-sync by on disk bit-map.\n",
ppsize(ppb, now << (BM_BLOCK_SHIFT-10)), now);
+ kref_put(&ctx->kref, &bm_aio_ctx_destroy);
return err;
}
@@ -1091,7 +1126,7 @@ static int bm_rw(struct drbd_conf *mdev, int rw, unsigned lazy_writeout_upper_id
*/
int drbd_bm_read(struct drbd_conf *mdev) __must_hold(local)
{
- return bm_rw(mdev, READ, 0);
+ return bm_rw(mdev, READ, 0, 0);
}
/**
@@ -1102,7 +1137,7 @@ int drbd_bm_read(struct drbd_conf *mdev) __must_hold(local)
*/
int drbd_bm_write(struct drbd_conf *mdev) __must_hold(local)
{
- return bm_rw(mdev, WRITE, 0);
+ return bm_rw(mdev, WRITE, 0, 0);
}
/**
@@ -1112,7 +1147,23 @@ int drbd_bm_write(struct drbd_conf *mdev) __must_hold(local)
*/
int drbd_bm_write_lazy(struct drbd_conf *mdev, unsigned upper_idx) __must_hold(local)
{
- return bm_rw(mdev, WRITE, upper_idx);
+ return bm_rw(mdev, WRITE, BM_AIO_COPY_PAGES, upper_idx);
+}
+
+/**
+ * drbd_bm_write_copy_pages() - Write the whole bitmap to its on disk location.
+ * @mdev: DRBD device.
+ *
+ * Will only write pages that have changed since last IO.
+ * In contrast to drbd_bm_write(), this will copy the bitmap pages
+ * to temporary writeout pages. It is intended to trigger a full write-out
+ * while still allowing the bitmap to change, for example if a resync or online
+ * verify is aborted due to a failed peer disk, while local IO continues, or
+ * pending resync acks are still being processed.
+ */
+int drbd_bm_write_copy_pages(struct drbd_conf *mdev) __must_hold(local)
+{
+ return bm_rw(mdev, WRITE, BM_AIO_COPY_PAGES, 0);
}
@@ -1130,28 +1181,45 @@ int drbd_bm_write_lazy(struct drbd_conf *mdev, unsigned upper_idx) __must_hold(l
*/
int drbd_bm_write_page(struct drbd_conf *mdev, unsigned int idx) __must_hold(local)
{
- struct bm_aio_ctx ctx = {
+ struct bm_aio_ctx *ctx;
+ int err;
+
+ if (bm_test_page_unchanged(mdev->bitmap->bm_pages[idx])) {
+ dynamic_dev_dbg(DEV, "skipped bm page write for idx %u\n", idx);
+ return 0;
+ }
+
+ ctx = kmalloc(sizeof(struct bm_aio_ctx), GFP_NOIO);
+ if (!ctx)
+ return -ENOMEM;
+
+ *ctx = (struct bm_aio_ctx) {
.mdev = mdev,
.in_flight = ATOMIC_INIT(1),
- .done = COMPLETION_INITIALIZER_ONSTACK(ctx.done),
+ .done = 0,
.flags = BM_AIO_COPY_PAGES,
+ .error = 0,
+ .kref = { ATOMIC_INIT(2) },
};
- if (bm_test_page_unchanged(mdev->bitmap->bm_pages[idx])) {
- dynamic_dev_dbg(DEV, "skipped bm page write for idx %u\n", idx);
- return 0;
+ if (!get_ldev_if_state(mdev, D_ATTACHING)) { /* put is in bm_aio_ctx_destroy() */
+ dev_err(DEV, "ASSERT FAILED: get_ldev_if_state() == 1 in drbd_bm_write_page()\n");
+ kfree(ctx);
+ return -ENODEV;
}
- bm_page_io_async(&ctx, idx, WRITE_SYNC);
- wait_for_completion(&ctx.done);
+ bm_page_io_async(ctx, idx, WRITE_SYNC);
+ wait_until_done_or_disk_failure(mdev, mdev->ldev, &ctx->done);
- if (ctx.error)
+ if (ctx->error)
drbd_chk_io_error(mdev, 1, true);
/* that should force detach, so the in memory bitmap will be
* gone in a moment as well. */
mdev->bm_writ_cnt++;
- return ctx.error;
+ err = atomic_read(&ctx->in_flight) ? -EIO : ctx->error;
+ kref_put(&ctx->kref, &bm_aio_ctx_destroy);
+ return err;
}
/* NOTE
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index 8d680562ba7..02f013a073a 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -712,7 +712,6 @@ struct drbd_request {
struct list_head tl_requests; /* ring list in the transfer log */
struct bio *master_bio; /* master bio pointer */
unsigned long rq_state; /* see comments above _req_mod() */
- int seq_num;
unsigned long start_time;
};
@@ -851,6 +850,7 @@ enum {
NEW_CUR_UUID, /* Create new current UUID when thawing IO */
AL_SUSPENDED, /* Activity logging is currently suspended. */
AHEAD_TO_SYNC_SOURCE, /* Ahead -> SyncSource queued */
+ STATE_SENT, /* Do not change state/UUIDs while this is set */
};
struct drbd_bitmap; /* opaque for drbd_conf */
@@ -862,31 +862,30 @@ enum bm_flag {
BM_P_VMALLOCED = 0x10000, /* internal use only, will be masked out */
/* currently locked for bulk operation */
- BM_LOCKED_MASK = 0x7,
+ BM_LOCKED_MASK = 0xf,
/* in detail, that is: */
BM_DONT_CLEAR = 0x1,
BM_DONT_SET = 0x2,
BM_DONT_TEST = 0x4,
+ /* so we can mark it locked for bulk operation,
+ * and still allow all non-bulk operations */
+ BM_IS_LOCKED = 0x8,
+
/* (test bit, count bit) allowed (common case) */
- BM_LOCKED_TEST_ALLOWED = 0x3,
+ BM_LOCKED_TEST_ALLOWED = BM_DONT_CLEAR | BM_DONT_SET | BM_IS_LOCKED,
/* testing bits, as well as setting new bits allowed, but clearing bits
* would be unexpected. Used during bitmap receive. Setting new bits
* requires sending of "out-of-sync" information, though. */
- BM_LOCKED_SET_ALLOWED = 0x1,
+ BM_LOCKED_SET_ALLOWED = BM_DONT_CLEAR | BM_IS_LOCKED,
- /* clear is not expected while bitmap is locked for bulk operation */
+ /* for drbd_bm_write_copy_pages, everything is allowed,
+ * only concurrent bulk operations are locked out. */
+ BM_LOCKED_CHANGE_ALLOWED = BM_IS_LOCKED,
};
-
-/* TODO sort members for performance
- * MAYBE group them further */
-
-/* THINK maybe we actually want to use the default "event/%s" worker threads
- * or similar in linux 2.6, which uses per cpu data and threads.
- */
struct drbd_work_queue {
struct list_head q;
struct semaphore s; /* producers up it, worker down()s it */
@@ -938,8 +937,7 @@ struct drbd_backing_dev {
};
struct drbd_md_io {
- struct drbd_conf *mdev;
- struct completion event;
+ unsigned int done;
int error;
};
@@ -1022,6 +1020,7 @@ struct drbd_conf {
struct drbd_tl_epoch *newest_tle;
struct drbd_tl_epoch *oldest_tle;
struct list_head out_of_sequence_requests;
+ struct list_head barrier_acked_requests;
struct hlist_head *tl_hash;
unsigned int tl_hash_s;
@@ -1056,6 +1055,8 @@ struct drbd_conf {
struct crypto_hash *csums_tfm;
struct crypto_hash *verify_tfm;
+ unsigned long last_reattach_jif;
+ unsigned long last_reconnect_jif;
struct drbd_thread receiver;
struct drbd_thread worker;
struct drbd_thread asender;
@@ -1094,7 +1095,8 @@ struct drbd_conf {
wait_queue_head_t ee_wait;
struct page *md_io_page; /* one page buffer for md_io */
struct page *md_io_tmpp; /* for logical_block_size != 512 */
- struct mutex md_io_mutex; /* protects the md_io_buffer */
+ struct drbd_md_io md_io;
+ atomic_t md_io_in_use; /* protects the md_io, md_io_page and md_io_tmpp */
spinlock_t al_lock;
wait_queue_head_t al_wait;
struct lru_cache *act_log; /* activity log */
@@ -1228,8 +1230,8 @@ extern int drbd_send_uuids(struct drbd_conf *mdev);
extern int drbd_send_uuids_skip_initial_sync(struct drbd_conf *mdev);
extern int drbd_gen_and_send_sync_uuid(struct drbd_conf *mdev);
extern int drbd_send_sizes(struct drbd_conf *mdev, int trigger_reply, enum dds_flags flags);
-extern int _drbd_send_state(struct drbd_conf *mdev);
-extern int drbd_send_state(struct drbd_conf *mdev);
+extern int drbd_send_state(struct drbd_conf *mdev, union drbd_state s);
+extern int drbd_send_current_state(struct drbd_conf *mdev);
extern int _drbd_send_cmd(struct drbd_conf *mdev, struct socket *sock,
enum drbd_packets cmd, struct p_header80 *h,
size_t size, unsigned msg_flags);
@@ -1461,6 +1463,7 @@ extern int drbd_bm_e_weight(struct drbd_conf *mdev, unsigned long enr);
extern int drbd_bm_write_page(struct drbd_conf *mdev, unsigned int idx) __must_hold(local);
extern int drbd_bm_read(struct drbd_conf *mdev) __must_hold(local);
extern int drbd_bm_write(struct drbd_conf *mdev) __must_hold(local);
+extern int drbd_bm_write_copy_pages(struct drbd_conf *mdev) __must_hold(local);
extern unsigned long drbd_bm_ALe_set_all(struct drbd_conf *mdev,
unsigned long al_enr);
extern size_t drbd_bm_words(struct drbd_conf *mdev);
@@ -1493,11 +1496,38 @@ extern struct kmem_cache *drbd_al_ext_cache; /* activity log extents */
extern mempool_t *drbd_request_mempool;
extern mempool_t *drbd_ee_mempool;
-extern struct page *drbd_pp_pool; /* drbd's page pool */
+/* drbd's page pool, used to buffer data received from the peer,
+ * or data requested by the peer.
+ *
+ * This does not have an emergency reserve.
+ *
+ * When allocating from this pool, it first takes pages from the pool.
+ * Only if the pool is depleted will try to allocate from the system.
+ *
+ * The assumption is that pages taken from this pool will be processed,
+ * and given back, "quickly", and then can be recycled, so we can avoid
+ * frequent calls to alloc_page(), and still will be able to make progress even
+ * under memory pressure.
+ */
+extern struct page *drbd_pp_pool;
extern spinlock_t drbd_pp_lock;
extern int drbd_pp_vacant;
extern wait_queue_head_t drbd_pp_wait;
+/* We also need a standard (emergency-reserve backed) page pool
+ * for meta data IO (activity log, bitmap).
+ * We can keep it global, as long as it is used as "N pages at a time".
+ * 128 should be plenty, currently we probably can get away with as few as 1.
+ */
+#define DRBD_MIN_POOL_PAGES 128
+extern mempool_t *drbd_md_io_page_pool;
+
+/* We also need to make sure we get a bio
+ * when we need it for housekeeping purposes */
+extern struct bio_set *drbd_md_io_bio_set;
+/* to allocate from that set */
+extern struct bio *bio_alloc_drbd(gfp_t gfp_mask);
+
extern rwlock_t global_state_lock;
extern struct drbd_conf *drbd_new_device(unsigned int minor);
@@ -1536,8 +1566,12 @@ extern void resume_next_sg(struct drbd_conf *mdev);
extern void suspend_other_sg(struct drbd_conf *mdev);
extern int drbd_resync_finished(struct drbd_conf *mdev);
/* maybe rather drbd_main.c ? */
+extern void *drbd_md_get_buffer(struct drbd_conf *mdev);
+extern void drbd_md_put_buffer(struct drbd_conf *mdev);
extern int drbd_md_sync_page_io(struct drbd_conf *mdev,
- struct drbd_backing_dev *bdev, sector_t sector, int rw);
+ struct drbd_backing_dev *bdev, sector_t sector, int rw);
+extern void wait_until_done_or_disk_failure(struct drbd_conf *mdev, struct drbd_backing_dev *bdev,
+ unsigned int *done);
extern void drbd_ov_oos_found(struct drbd_conf*, sector_t, int);
extern void drbd_rs_controller_reset(struct drbd_conf *mdev);
@@ -1754,19 +1788,6 @@ static inline struct page *page_chain_next(struct page *page)
#define page_chain_for_each_safe(page, n) \
for (; page && ({ n = page_chain_next(page); 1; }); page = n)
-static inline int drbd_bio_has_active_page(struct bio *bio)
-{
- struct bio_vec *bvec;
- int i;
-
- __bio_for_each_segment(bvec, bio, i, 0) {
- if (page_count(bvec->bv_page) > 1)
- return 1;
- }
-
- return 0;
-}
-
static inline int drbd_ee_has_active_page(struct drbd_epoch_entry *e)
{
struct page *page = e->pages;
@@ -1777,7 +1798,6 @@ static inline int drbd_ee_has_active_page(struct drbd_epoch_entry *e)
return 0;
}
-
static inline void drbd_state_lock(struct drbd_conf *mdev)
{
wait_event(mdev->misc_wait,
@@ -2230,7 +2250,7 @@ static inline void drbd_get_syncer_progress(struct drbd_conf *mdev,
* Note: currently we don't support such large bitmaps on 32bit
* arch anyways, but no harm done to be prepared for it here.
*/
- unsigned int shift = mdev->rs_total >= (1ULL << 32) ? 16 : 10;
+ unsigned int shift = mdev->rs_total > UINT_MAX ? 16 : 10;
unsigned long left = *bits_left >> shift;
unsigned long total = 1UL + (mdev->rs_total >> shift);
unsigned long tmp = 1000UL - left * 1000UL/total;
@@ -2306,12 +2326,12 @@ static inline int drbd_state_is_stable(struct drbd_conf *mdev)
case D_OUTDATED:
case D_CONSISTENT:
case D_UP_TO_DATE:
+ case D_FAILED:
/* disk state is stable as well. */
break;
/* no new io accepted during tansitional states */
case D_ATTACHING:
- case D_FAILED:
case D_NEGOTIATING:
case D_UNKNOWN:
case D_MASK:
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 211fc44f84b..920ede2829d 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -139,6 +139,8 @@ struct kmem_cache *drbd_bm_ext_cache; /* bitmap extents */
struct kmem_cache *drbd_al_ext_cache; /* activity log extents */
mempool_t *drbd_request_mempool;
mempool_t *drbd_ee_mempool;
+mempool_t *drbd_md_io_page_pool;
+struct bio_set *drbd_md_io_bio_set;
/* I do not use a standard mempool, because:
1) I want to hand out the pre-allocated objects first.
@@ -159,7 +161,24 @@ static const struct block_device_operations drbd_ops = {
.release = drbd_release,
};
-#define ARRY_SIZE(A) (sizeof(A)/sizeof(A[0]))
+static void bio_destructor_drbd(struct bio *bio)
+{
+ bio_free(bio, drbd_md_io_bio_set);
+}
+
+struct bio *bio_alloc_drbd(gfp_t gfp_mask)
+{
+ struct bio *bio;
+
+ if (!drbd_md_io_bio_set)
+ return bio_alloc(gfp_mask, 1);
+
+ bio = bio_alloc_bioset(gfp_mask, 1, drbd_md_io_bio_set);
+ if (!bio)
+ return NULL;
+ bio->bi_destructor = bio_destructor_drbd;
+ return bio;
+}
#ifdef __CHECKER__
/* When checking with sparse, and this is an inline function, sparse will
@@ -208,6 +227,7 @@ static int tl_init(struct drbd_conf *mdev)
mdev->oldest_tle = b;
mdev->newest_tle = b;
INIT_LIST_HEAD(&mdev->out_of_sequence_requests);
+ INIT_LIST_HEAD(&mdev->barrier_acked_requests);
mdev->tl_hash = NULL;
mdev->tl_hash_s = 0;
@@ -246,9 +266,7 @@ void _tl_add_barrier(struct drbd_conf *mdev, struct drbd_tl_epoch *new)
new->n_writes = 0;
newest_before = mdev->newest_tle;
- /* never send a barrier number == 0, because that is special-cased
- * when using TCQ for our write ordering code */
- new->br_number = (newest_before->br_number+1) ?: 1;
+ new->br_number = newest_before->br_number+1;
if (mdev->newest_tle != new) {
mdev->newest_tle->next = new;
mdev->newest_tle = new;
@@ -311,7 +329,7 @@ void tl_release(struct drbd_conf *mdev, unsigned int barrier_nr,
These have been list_move'd to the out_of_sequence_requests list in
_req_mod(, barrier_acked) above.
*/
- list_del_init(&b->requests);
+ list_splice_init(&b->requests, &mdev->barrier_acked_requests);
nob = b->next;
if (test_and_clear_bit(CREATE_BARRIER, &mdev->flags)) {
@@ -411,6 +429,23 @@ static void _tl_restart(struct drbd_conf *mdev, enum drbd_req_event what)
b = tmp;
list_splice(&carry_reads, &b->requests);
}
+
+ /* Actions operating on the disk state, also want to work on
+ requests that got barrier acked. */
+ switch (what) {
+ case fail_frozen_disk_io:
+ case restart_frozen_disk_io:
+ list_for_each_safe(le, tle, &mdev->barrier_acked_requests) {
+ req = list_entry(le, struct drbd_request, tl_requests);
+ _req_mod(req, what);
+ }
+
+ case connection_lost_while_pending:
+ case resend:
+ break;
+ default:
+ dev_err(DEV, "what = %d in _tl_restart()\n", what);
+ }
}
@@ -458,6 +493,38 @@ void tl_restart(struct drbd_conf *mdev, enum drbd_req_event what)
}
/**
+ * tl_abort_disk_io() - Abort disk I/O for all requests for a certain mdev in the TL
+ * @mdev: DRBD device.
+ */
+void tl_abort_disk_io(struct drbd_conf *mdev)
+{
+ struct drbd_tl_epoch *b;
+ struct list_head *le, *tle;
+ struct drbd_request *req;
+
+ spin_lock_irq(&mdev->req_lock);
+ b = mdev->oldest_tle;
+ while (b) {
+ list_for_each_safe(le, tle, &b->requests) {
+ req = list_entry(le, struct drbd_request, tl_requests);
+ if (!(req->rq_state & RQ_LOCAL_PENDING))
+ continue;
+ _req_mod(req, abort_disk_io);
+ }
+ b = b->next;
+ }
+
+ list_for_each_safe(le, tle, &mdev->barrier_acked_requests) {
+ req = list_entry(le, struct drbd_request, tl_requests);
+ if (!(req->rq_state & RQ_LOCAL_PENDING))
+ continue;
+ _req_mod(req, abort_disk_io);
+ }
+
+ spin_unlock_irq(&mdev->req_lock);
+}
+
+/**
* cl_wide_st_chg() - true if the state change is a cluster wide one
* @mdev: DRBD device.
* @os: old (current) state.
@@ -470,7 +537,7 @@ static int cl_wide_st_chg(struct drbd_conf *mdev,
((os.role != R_PRIMARY && ns.role == R_PRIMARY) ||
(os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) ||
(os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S) ||
- (os.disk != D_DISKLESS && ns.disk == D_DISKLESS))) ||
+ (os.disk != D_FAILED && ns.disk == D_FAILED))) ||
(os.conn >= C_CONNECTED && ns.conn == C_DISCONNECTING) ||
(os.conn == C_CONNECTED && ns.conn == C_VERIFY_S);
}
@@ -509,8 +576,16 @@ static enum drbd_state_rv is_valid_state(struct drbd_conf *, union drbd_state);
static enum drbd_state_rv is_valid_state_transition(struct drbd_conf *,
union drbd_state,
union drbd_state);
+enum sanitize_state_warnings {
+ NO_WARNING,
+ ABORTED_ONLINE_VERIFY,
+ ABORTED_RESYNC,
+ CONNECTION_LOST_NEGOTIATING,
+ IMPLICITLY_UPGRADED_DISK,
+ IMPLICITLY_UPGRADED_PDSK,
+};
static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state os,
- union drbd_state ns, const char **warn_sync_abort);
+ union drbd_state ns, enum sanitize_state_warnings *warn);
int drbd_send_state_req(struct drbd_conf *,
union drbd_state, union drbd_state);
@@ -785,6 +860,13 @@ is_valid_state_transition(struct drbd_conf *mdev, union drbd_state ns,
if (ns.conn == os.conn && ns.conn == C_WF_REPORT_PARAMS)
rv = SS_IN_TRANSIENT_STATE;
+ /* While establishing a connection only allow cstate to change.
+ Delay/refuse role changes, detach attach etc... */
+ if (test_bit(STATE_SENT, &mdev->flags) &&
+ !(os.conn == C_WF_REPORT_PARAMS ||
+ (ns.conn == C_WF_REPORT_PARAMS && os.conn == C_WF_CONNECTION)))
+ rv = SS_IN_TRANSIENT_STATE;
+
if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && os.conn < C_CONNECTED)
rv = SS_NEED_CONNECTION;
@@ -803,6 +885,21 @@ is_valid_state_transition(struct drbd_conf *mdev, union drbd_state ns,
return rv;
}
+static void print_sanitize_warnings(struct drbd_conf *mdev, enum sanitize_state_warnings warn)
+{
+ static const char *msg_table[] = {
+ [NO_WARNING] = "",
+ [ABORTED_ONLINE_VERIFY] = "Online-verify aborted.",
+ [ABORTED_RESYNC] = "Resync aborted.",
+ [CONNECTION_LOST_NEGOTIATING] = "Connection lost while negotiating, no data!",
+ [IMPLICITLY_UPGRADED_DISK] = "Implicitly upgraded disk",
+ [IMPLICITLY_UPGRADED_PDSK] = "Implicitly upgraded pdsk",
+ };
+
+ if (warn != NO_WARNING)
+ dev_warn(DEV, "%s\n", msg_table[warn]);
+}
+
/**
* sanitize_state() - Resolves implicitly necessary additional changes to a state transition
* @mdev: DRBD device.
@@ -814,11 +911,14 @@ is_valid_state_transition(struct drbd_conf *mdev, union drbd_state ns,
* to D_UNKNOWN. This rule and many more along those lines are in this function.
*/
static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state os,
- union drbd_state ns, const char **warn_sync_abort)
+ union drbd_state ns, enum sanitize_state_warnings *warn)
{
enum drbd_fencing_p fp;
enum drbd_disk_state disk_min, disk_max, pdsk_min, pdsk_max;
+ if (warn)
+ *warn = NO_WARNING;
+
fp = FP_DONT_CARE;
if (get_ldev(mdev)) {
fp = mdev->ldev->dc.fencing;
@@ -833,18 +933,13 @@ static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state
/* After a network error (+C_TEAR_DOWN) only C_UNCONNECTED or C_DISCONNECTING can follow.
* If you try to go into some Sync* state, that shall fail (elsewhere). */
if (os.conn >= C_TIMEOUT && os.conn <= C_TEAR_DOWN &&
- ns.conn != C_UNCONNECTED && ns.conn != C_DISCONNECTING && ns.conn <= C_TEAR_DOWN)
+ ns.conn != C_UNCONNECTED && ns.conn != C_DISCONNECTING && ns.conn <= C_CONNECTED)
ns.conn = os.conn;
/* we cannot fail (again) if we already detached */
if (ns.disk == D_FAILED && os.disk == D_DISKLESS)
ns.disk = D_DISKLESS;
- /* if we are only D_ATTACHING yet,
- * we can (and should) go directly to D_DISKLESS. */
- if (ns.disk == D_FAILED && os.disk == D_ATTACHING)
- ns.disk = D_DISKLESS;
-
/* After C_DISCONNECTING only C_STANDALONE may follow */
if (os.conn == C_DISCONNECTING && ns.conn != C_STANDALONE)
ns.conn = os.conn;
@@ -863,10 +958,9 @@ static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state
/* Abort resync if a disk fails/detaches */
if (os.conn > C_CONNECTED && ns.conn > C_CONNECTED &&
(ns.disk <= D_FAILED || ns.pdsk <= D_FAILED)) {
- if (warn_sync_abort)
- *warn_sync_abort =
- os.conn == C_VERIFY_S || os.conn == C_VERIFY_T ?
- "Online-verify" : "Resync";
+ if (warn)
+ *warn = os.conn == C_VERIFY_S || os.conn == C_VERIFY_T ?
+ ABORTED_ONLINE_VERIFY : ABORTED_RESYNC;
ns.conn = C_CONNECTED;
}
@@ -877,7 +971,8 @@ static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state
ns.disk = mdev->new_state_tmp.disk;
ns.pdsk = mdev->new_state_tmp.pdsk;
} else {
- dev_alert(DEV, "Connection lost while negotiating, no data!\n");
+ if (warn)
+ *warn = CONNECTION_LOST_NEGOTIATING;
ns.disk = D_DISKLESS;
ns.pdsk = D_UNKNOWN;
}
@@ -959,16 +1054,16 @@ static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state
ns.disk = disk_max;
if (ns.disk < disk_min) {
- dev_warn(DEV, "Implicitly set disk from %s to %s\n",
- drbd_disk_str(ns.disk), drbd_disk_str(disk_min));
+ if (warn)
+ *warn = IMPLICITLY_UPGRADED_DISK;
ns.disk = disk_min;
}
if (ns.pdsk > pdsk_max)
ns.pdsk = pdsk_max;
if (ns.pdsk < pdsk_min) {
- dev_warn(DEV, "Implicitly set pdsk from %s to %s\n",
- drbd_disk_str(ns.pdsk), drbd_disk_str(pdsk_min));
+ if (warn)
+ *warn = IMPLICITLY_UPGRADED_PDSK;
ns.pdsk = pdsk_min;
}
@@ -1045,12 +1140,12 @@ __drbd_set_state(struct drbd_conf *mdev, union drbd_state ns,
{
union drbd_state os;
enum drbd_state_rv rv = SS_SUCCESS;
- const char *warn_sync_abort = NULL;
+ enum sanitize_state_warnings ssw;
struct after_state_chg_work *ascw;
os = mdev->state;
- ns = sanitize_state(mdev, os, ns, &warn_sync_abort);
+ ns = sanitize_state(mdev, os, ns, &ssw);
if (ns.i == os.i)
return SS_NOTHING_TO_DO;
@@ -1076,8 +1171,7 @@ __drbd_set_state(struct drbd_conf *mdev, union drbd_state ns,
return rv;
}
- if (warn_sync_abort)
- dev_warn(DEV, "%s aborted.\n", warn_sync_abort);
+ print_sanitize_warnings(mdev, ssw);
{
char *pbp, pb[300];
@@ -1243,7 +1337,7 @@ __drbd_set_state(struct drbd_conf *mdev, union drbd_state ns,
drbd_thread_stop_nowait(&mdev->receiver);
/* Upon network failure, we need to restart the receiver. */
- if (os.conn > C_TEAR_DOWN &&
+ if (os.conn > C_WF_CONNECTION &&
ns.conn <= C_TEAR_DOWN && ns.conn >= C_TIMEOUT)
drbd_thread_restart_nowait(&mdev->receiver);
@@ -1251,6 +1345,15 @@ __drbd_set_state(struct drbd_conf *mdev, union drbd_state ns,
if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED)
drbd_resume_al(mdev);
+ /* remember last connect and attach times so request_timer_fn() won't
+ * kill newly established sessions while we are still trying to thaw
+ * previously frozen IO */
+ if (os.conn != C_WF_REPORT_PARAMS && ns.conn == C_WF_REPORT_PARAMS)
+ mdev->last_reconnect_jif = jiffies;
+ if ((os.disk == D_ATTACHING || os.disk == D_NEGOTIATING) &&
+ ns.disk > D_NEGOTIATING)
+ mdev->last_reattach_jif = jiffies;
+
ascw = kmalloc(sizeof(*ascw), GFP_ATOMIC);
if (ascw) {
ascw->os = os;
@@ -1354,12 +1457,16 @@ static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
/* Here we have the actions that are performed after a
state change. This function might sleep */
+ if (os.disk <= D_NEGOTIATING && ns.disk > D_NEGOTIATING)
+ mod_timer(&mdev->request_timer, jiffies + HZ);
+
nsm.i = -1;
if (ns.susp_nod) {
if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED)
what = resend;
- if (os.disk == D_ATTACHING && ns.disk > D_ATTACHING)
+ if ((os.disk == D_ATTACHING || os.disk == D_NEGOTIATING) &&
+ ns.disk > D_NEGOTIATING)
what = restart_frozen_disk_io;
if (what != nothing)
@@ -1408,7 +1515,7 @@ static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
/* Do not change the order of the if above and the two below... */
if (os.pdsk == D_DISKLESS && ns.pdsk > D_DISKLESS) { /* attach on the peer */
drbd_send_uuids(mdev);
- drbd_send_state(mdev);
+ drbd_send_state(mdev, ns);
}
/* No point in queuing send_bitmap if we don't have a connection
* anymore, so check also the _current_ state, not only the new state
@@ -1441,11 +1548,11 @@ static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
}
if (ns.pdsk < D_INCONSISTENT && get_ldev(mdev)) {
- if (ns.peer == R_PRIMARY && mdev->ldev->md.uuid[UI_BITMAP] == 0) {
+ if (os.peer == R_SECONDARY && ns.peer == R_PRIMARY &&
+ mdev->ldev->md.uuid[UI_BITMAP] == 0 && ns.disk >= D_UP_TO_DATE) {
drbd_uuid_new_current(mdev);
drbd_send_uuids(mdev);
}
-
/* D_DISKLESS Peer becomes secondary */
if (os.peer == R_PRIMARY && ns.peer == R_SECONDARY)
/* We may still be Primary ourselves.
@@ -1473,14 +1580,14 @@ static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
os.disk == D_ATTACHING && ns.disk == D_NEGOTIATING) {
drbd_send_sizes(mdev, 0, 0); /* to start sync... */
drbd_send_uuids(mdev);
- drbd_send_state(mdev);
+ drbd_send_state(mdev, ns);
}
/* We want to pause/continue resync, tell peer. */
if (ns.conn >= C_CONNECTED &&
((os.aftr_isp != ns.aftr_isp) ||
(os.user_isp != ns.user_isp)))
- drbd_send_state(mdev);
+ drbd_send_state(mdev, ns);
/* In case one of the isp bits got set, suspend other devices. */
if ((!os.aftr_isp && !os.peer_isp && !os.user_isp) &&
@@ -1490,10 +1597,10 @@ static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
/* Make sure the peer gets informed about eventual state
changes (ISP bits) while we were in WFReportParams. */
if (os.conn == C_WF_REPORT_PARAMS && ns.conn >= C_CONNECTED)
- drbd_send_state(mdev);
+ drbd_send_state(mdev, ns);
if (os.conn != C_AHEAD && ns.conn == C_AHEAD)
- drbd_send_state(mdev);
+ drbd_send_state(mdev, ns);
/* We are in the progress to start a full sync... */
if ((os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) ||
@@ -1513,33 +1620,38 @@ static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
/* first half of local IO error, failure to attach,
* or administrative detach */
if (os.disk != D_FAILED && ns.disk == D_FAILED) {
- enum drbd_io_error_p eh;
- int was_io_error;
+ enum drbd_io_error_p eh = EP_PASS_ON;
+ int was_io_error = 0;
/* corresponding get_ldev was in __drbd_set_state, to serialize
- * our cleanup here with the transition to D_DISKLESS,
- * so it is safe to dreference ldev here. */
- eh = mdev->ldev->dc.on_io_error;
- was_io_error = test_and_clear_bit(WAS_IO_ERROR, &mdev->flags);
-
- /* current state still has to be D_FAILED,
- * there is only one way out: to D_DISKLESS,
- * and that may only happen after our put_ldev below. */
- if (mdev->state.disk != D_FAILED)
- dev_err(DEV,
- "ASSERT FAILED: disk is %s during detach\n",
- drbd_disk_str(mdev->state.disk));
-
- if (drbd_send_state(mdev))
- dev_warn(DEV, "Notified peer that I am detaching my disk\n");
- else
- dev_err(DEV, "Sending state for detaching disk failed\n");
-
- drbd_rs_cancel_all(mdev);
-
- /* In case we want to get something to stable storage still,
- * this may be the last chance.
- * Following put_ldev may transition to D_DISKLESS. */
- drbd_md_sync(mdev);
+ * our cleanup here with the transition to D_DISKLESS.
+ * But is is still not save to dreference ldev here, since
+ * we might come from an failed Attach before ldev was set. */
+ if (mdev->ldev) {
+ eh = mdev->ldev->dc.on_io_error;
+ was_io_error = test_and_clear_bit(WAS_IO_ERROR, &mdev->flags);
+
+ /* Immediately allow completion of all application IO, that waits
+ for completion from the local disk. */
+ tl_abort_disk_io(mdev);
+
+ /* current state still has to be D_FAILED,
+ * there is only one way out: to D_DISKLESS,
+ * and that may only happen after our put_ldev below. */
+ if (mdev->state.disk != D_FAILED)
+ dev_err(DEV,
+ "ASSERT FAILED: disk is %s during detach\n",
+ drbd_disk_str(mdev->state.disk));
+
+ if (ns.conn >= C_CONNECTED)
+ drbd_send_state(mdev, ns);
+
+ drbd_rs_cancel_all(mdev);
+
+ /* In case we want to get something to stable storage still,
+ * this may be the last chance.
+ * Following put_ldev may transition to D_DISKLESS. */
+ drbd_md_sync(mdev);
+ }
put_ldev(mdev);
if (was_io_error && eh == EP_CALL_HELPER)
@@ -1561,16 +1673,17 @@ static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
mdev->rs_failed = 0;
atomic_set(&mdev->rs_pending_cnt, 0);
- if (drbd_send_state(mdev))
- dev_warn(DEV, "Notified peer that I'm now diskless.\n");
+ if (ns.conn >= C_CONNECTED)
+ drbd_send_state(mdev, ns);
+
/* corresponding get_ldev in __drbd_set_state
* this may finally trigger drbd_ldev_destroy. */
put_ldev(mdev);
}
/* Notify peer that I had a local IO error, and did not detached.. */
- if (os.disk == D_UP_TO_DATE && ns.disk == D_INCONSISTENT)
- drbd_send_state(mdev);
+ if (os.disk == D_UP_TO_DATE && ns.disk == D_INCONSISTENT && ns.conn >= C_CONNECTED)
+ drbd_send_state(mdev, ns);
/* Disks got bigger while they were detached */
if (ns.disk > D_NEGOTIATING && ns.pdsk > D_NEGOTIATING &&
@@ -1588,7 +1701,13 @@ static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
/* sync target done with resync. Explicitly notify peer, even though
* it should (at least for non-empty resyncs) already know itself. */
if (os.disk < D_UP_TO_DATE && os.conn >= C_SYNC_SOURCE && ns.conn == C_CONNECTED)
- drbd_send_state(mdev);
+ drbd_send_state(mdev, ns);
+
+ /* Wake up role changes, that were delayed because of connection establishing */
+ if (os.conn == C_WF_REPORT_PARAMS && ns.conn != C_WF_REPORT_PARAMS) {
+ clear_bit(STATE_SENT, &mdev->flags);
+ wake_up(&mdev->state_wait);
+ }
/* This triggers bitmap writeout of potentially still unwritten pages
* if the resync finished cleanly, or aborted because of peer disk
@@ -1598,8 +1717,8 @@ static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
* No harm done if some bits change during this phase.
*/
if (os.conn > C_CONNECTED && ns.conn <= C_CONNECTED && get_ldev(mdev)) {
- drbd_queue_bitmap_io(mdev, &drbd_bm_write, NULL,
- "write from resync_finished", BM_LOCKED_SET_ALLOWED);
+ drbd_queue_bitmap_io(mdev, &drbd_bm_write_copy_pages, NULL,
+ "write from resync_finished", BM_LOCKED_CHANGE_ALLOWED);
put_ldev(mdev);
}
@@ -2057,7 +2176,11 @@ int drbd_gen_and_send_sync_uuid(struct drbd_conf *mdev)
D_ASSERT(mdev->state.disk == D_UP_TO_DATE);
- uuid = mdev->ldev->md.uuid[UI_BITMAP] + UUID_NEW_BM_OFFSET;
+ uuid = mdev->ldev->md.uuid[UI_BITMAP];
+ if (uuid && uuid != UUID_JUST_CREATED)
+ uuid = uuid + UUID_NEW_BM_OFFSET;
+ else
+ get_random_bytes(&uuid, sizeof(u64));
drbd_uuid_set(mdev, UI_BITMAP, uuid);
drbd_print_uuids(mdev, "updated sync UUID");
drbd_md_sync(mdev);
@@ -2089,6 +2212,10 @@ int drbd_send_sizes(struct drbd_conf *mdev, int trigger_reply, enum dds_flags fl
max_bio_size = DRBD_MAX_BIO_SIZE; /* ... multiple BIOs per peer_request */
}
+ /* Never allow old drbd (up to 8.3.7) to see more than 32KiB */
+ if (mdev->agreed_pro_version <= 94)
+ max_bio_size = min_t(int, max_bio_size, DRBD_MAX_SIZE_H80_PACKET);
+
p.d_size = cpu_to_be64(d_size);
p.u_size = cpu_to_be64(u_size);
p.c_size = cpu_to_be64(trigger_reply ? 0 : drbd_get_capacity(mdev->this_bdev));
@@ -2102,10 +2229,10 @@ int drbd_send_sizes(struct drbd_conf *mdev, int trigger_reply, enum dds_flags fl
}
/**
- * drbd_send_state() - Sends the drbd state to the peer
+ * drbd_send_current_state() - Sends the drbd state to the peer
* @mdev: DRBD device.
*/
-int drbd_send_state(struct drbd_conf *mdev)
+int drbd_send_current_state(struct drbd_conf *mdev)
{
struct socket *sock;
struct p_state p;
@@ -2131,6 +2258,37 @@ int drbd_send_state(struct drbd_conf *mdev)
return ok;
}
+/**
+ * drbd_send_state() - After a state change, sends the new state to the peer
+ * @mdev: DRBD device.
+ * @state: the state to send, not necessarily the current state.
+ *
+ * Each state change queues an "after_state_ch" work, which will eventually
+ * send the resulting new state to the peer. If more state changes happen
+ * between queuing and processing of the after_state_ch work, we still
+ * want to send each intermediary state in the order it occurred.
+ */
+int drbd_send_state(struct drbd_conf *mdev, union drbd_state state)
+{
+ struct socket *sock;
+ struct p_state p;
+ int ok = 0;
+
+ mutex_lock(&mdev->data.mutex);
+
+ p.state = cpu_to_be32(state.i);
+ sock = mdev->data.socket;
+
+ if (likely(sock != NULL)) {
+ ok = _drbd_send_cmd(mdev, sock, P_STATE,
+ (struct p_header80 *)&p, sizeof(p), 0);
+ }
+
+ mutex_unlock(&mdev->data.mutex);
+
+ return ok;
+}
+
int drbd_send_state_req(struct drbd_conf *mdev,
union drbd_state mask, union drbd_state val)
{
@@ -2615,7 +2773,7 @@ static int _drbd_send_bio(struct drbd_conf *mdev, struct bio *bio)
struct bio_vec *bvec;
int i;
/* hint all but last page with MSG_MORE */
- __bio_for_each_segment(bvec, bio, i, 0) {
+ bio_for_each_segment(bvec, bio, i) {
if (!_drbd_no_send_page(mdev, bvec->bv_page,
bvec->bv_offset, bvec->bv_len,
i == bio->bi_vcnt -1 ? 0 : MSG_MORE))
@@ -2629,7 +2787,7 @@ static int _drbd_send_zc_bio(struct drbd_conf *mdev, struct bio *bio)
struct bio_vec *bvec;
int i;
/* hint all but last page with MSG_MORE */
- __bio_for_each_segment(bvec, bio, i, 0) {
+ bio_for_each_segment(bvec, bio, i) {
if (!_drbd_send_page(mdev, bvec->bv_page,
bvec->bv_offset, bvec->bv_len,
i == bio->bi_vcnt -1 ? 0 : MSG_MORE))
@@ -2695,8 +2853,7 @@ int drbd_send_dblock(struct drbd_conf *mdev, struct drbd_request *req)
p.sector = cpu_to_be64(req->sector);
p.block_id = (unsigned long)req;
- p.seq_num = cpu_to_be32(req->seq_num =
- atomic_add_return(1, &mdev->packet_seq));
+ p.seq_num = cpu_to_be32(atomic_add_return(1, &mdev->packet_seq));
dp_flags = bio_flags_to_wire(mdev, req->master_bio->bi_rw);
@@ -2987,8 +3144,8 @@ void drbd_init_set_defaults(struct drbd_conf *mdev)
atomic_set(&mdev->rs_sect_in, 0);
atomic_set(&mdev->rs_sect_ev, 0);
atomic_set(&mdev->ap_in_flight, 0);
+ atomic_set(&mdev->md_io_in_use, 0);
- mutex_init(&mdev->md_io_mutex);
mutex_init(&mdev->data.mutex);
mutex_init(&mdev->meta.mutex);
sema_init(&mdev->data.work.s, 0);
@@ -3126,6 +3283,10 @@ static void drbd_destroy_mempools(void)
/* D_ASSERT(atomic_read(&drbd_pp_vacant)==0); */
+ if (drbd_md_io_bio_set)
+ bioset_free(drbd_md_io_bio_set);
+ if (drbd_md_io_page_pool)
+ mempool_destroy(drbd_md_io_page_pool);
if (drbd_ee_mempool)
mempool_destroy(drbd_ee_mempool);
if (drbd_request_mempool)
@@ -3139,6 +3300,8 @@ static void drbd_destroy_mempools(void)
if (drbd_al_ext_cache)
kmem_cache_destroy(drbd_al_ext_cache);
+ drbd_md_io_bio_set = NULL;
+ drbd_md_io_page_pool = NULL;
drbd_ee_mempool = NULL;
drbd_request_mempool = NULL;
drbd_ee_cache = NULL;
@@ -3162,6 +3325,8 @@ static int drbd_create_mempools(void)
drbd_bm_ext_cache = NULL;
drbd_al_ext_cache = NULL;
drbd_pp_pool = NULL;
+ drbd_md_io_page_pool = NULL;
+ drbd_md_io_bio_set = NULL;
/* caches */
drbd_request_cache = kmem_cache_create(
@@ -3185,6 +3350,16 @@ static int drbd_create_mempools(void)
goto Enomem;
/* mempools */
+#ifdef COMPAT_HAVE_BIOSET_CREATE
+ drbd_md_io_bio_set = bioset_create(DRBD_MIN_POOL_PAGES, 0);
+ if (drbd_md_io_bio_set == NULL)
+ goto Enomem;
+#endif
+
+ drbd_md_io_page_pool = mempool_create_page_pool(DRBD_MIN_POOL_PAGES, 0);
+ if (drbd_md_io_page_pool == NULL)
+ goto Enomem;
+
drbd_request_mempool = mempool_create(number,
mempool_alloc_slab, mempool_free_slab, drbd_request_cache);
if (drbd_request_mempool == NULL)
@@ -3262,6 +3437,8 @@ static void drbd_delete_device(unsigned int minor)
if (!mdev)
return;
+ del_timer_sync(&mdev->request_timer);
+
/* paranoia asserts */
if (mdev->open_cnt != 0)
dev_err(DEV, "open_cnt = %d in %s:%u", mdev->open_cnt,
@@ -3666,8 +3843,10 @@ void drbd_md_sync(struct drbd_conf *mdev)
if (!get_ldev_if_state(mdev, D_FAILED))
return;
- mutex_lock(&mdev->md_io_mutex);
- buffer = (struct meta_data_on_disk *)page_address(mdev->md_io_page);
+ buffer = drbd_md_get_buffer(mdev);
+ if (!buffer)
+ goto out;
+
memset(buffer, 0, 512);
buffer->la_size = cpu_to_be64(drbd_get_capacity(mdev->this_bdev));
@@ -3698,7 +3877,8 @@ void drbd_md_sync(struct drbd_conf *mdev)
* since we updated it on metadata. */
mdev->ldev->md.la_size_sect = drbd_get_capacity(mdev->this_bdev);
- mutex_unlock(&mdev->md_io_mutex);
+ drbd_md_put_buffer(mdev);
+out:
put_ldev(mdev);
}
@@ -3718,8 +3898,9 @@ int drbd_md_read(struct drbd_conf *mdev, struct drbd_backing_dev *bdev)
if (!get_ldev_if_state(mdev, D_ATTACHING))
return ERR_IO_MD_DISK;
- mutex_lock(&mdev->md_io_mutex);
- buffer = (struct meta_data_on_disk *)page_address(mdev->md_io_page);
+ buffer = drbd_md_get_buffer(mdev);
+ if (!buffer)
+ goto out;
if (!drbd_md_sync_page_io(mdev, bdev, bdev->md.md_offset, READ)) {
/* NOTE: can't do normal error processing here as this is
@@ -3780,7 +3961,8 @@ int drbd_md_read(struct drbd_conf *mdev, struct drbd_backing_dev *bdev)
mdev->sync_conf.al_extents = 127;
err:
- mutex_unlock(&mdev->md_io_mutex);
+ drbd_md_put_buffer(mdev);
+ out:
put_ldev(mdev);
return rv;
@@ -4183,12 +4365,11 @@ const char *drbd_buildtag(void)
static char buildtag[38] = "\0uilt-in";
if (buildtag[0] == 0) {
-#ifdef CONFIG_MODULES
- if (THIS_MODULE != NULL)
- sprintf(buildtag, "srcversion: %-24s", THIS_MODULE->srcversion);
- else
+#ifdef MODULE
+ sprintf(buildtag, "srcversion: %-24s", THIS_MODULE->srcversion);
+#else
+ buildtag[0] = 'b';
#endif
- buildtag[0] = 'b';
}
return buildtag;
diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index 946166e1395..6d4de6a72e8 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -289,7 +289,7 @@ static int _try_outdate_peer_async(void *data)
*/
spin_lock_irq(&mdev->req_lock);
ns = mdev->state;
- if (ns.conn < C_WF_REPORT_PARAMS) {
+ if (ns.conn < C_WF_REPORT_PARAMS && !test_bit(STATE_SENT, &mdev->flags)) {
ns.pdsk = nps;
_drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
}
@@ -432,7 +432,7 @@ drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force)
/* if this was forced, we should consider sync */
if (forced)
drbd_send_uuids(mdev);
- drbd_send_state(mdev);
+ drbd_send_current_state(mdev);
}
drbd_md_sync(mdev);
@@ -845,9 +845,10 @@ void drbd_reconsider_max_bio_size(struct drbd_conf *mdev)
Because new from 8.3.8 onwards the peer can use multiple
BIOs for a single peer_request */
if (mdev->state.conn >= C_CONNECTED) {
- if (mdev->agreed_pro_version < 94)
- peer = mdev->peer_max_bio_size;
- else if (mdev->agreed_pro_version == 94)
+ if (mdev->agreed_pro_version < 94) {
+ peer = min_t(int, mdev->peer_max_bio_size, DRBD_MAX_SIZE_H80_PACKET);
+ /* Correct old drbd (up to 8.3.7) if it believes it can do more than 32KiB */
+ } else if (mdev->agreed_pro_version == 94)
peer = DRBD_MAX_SIZE_H80_PACKET;
else /* drbd 8.3.8 onwards */
peer = DRBD_MAX_BIO_SIZE;
@@ -1032,7 +1033,7 @@ static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp
dev_err(DEV, "max capacity %llu smaller than disk size %llu\n",
(unsigned long long) drbd_get_max_capacity(nbc),
(unsigned long long) nbc->dc.disk_size);
- retcode = ERR_DISK_TO_SMALL;
+ retcode = ERR_DISK_TOO_SMALL;
goto fail;
}
@@ -1046,7 +1047,7 @@ static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp
}
if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) {
- retcode = ERR_MD_DISK_TO_SMALL;
+ retcode = ERR_MD_DISK_TOO_SMALL;
dev_warn(DEV, "refusing attach: md-device too small, "
"at least %llu sectors needed for this meta-disk type\n",
(unsigned long long) min_md_device_sectors);
@@ -1057,7 +1058,7 @@ static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp
* (we may currently be R_PRIMARY with no local disk...) */
if (drbd_get_max_capacity(nbc) <
drbd_get_capacity(mdev->this_bdev)) {
- retcode = ERR_DISK_TO_SMALL;
+ retcode = ERR_DISK_TOO_SMALL;
goto fail;
}
@@ -1138,7 +1139,7 @@ static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp
if (drbd_md_test_flag(nbc, MDF_CONSISTENT) &&
drbd_new_dev_size(mdev, nbc, 0) < nbc->md.la_size_sect) {
dev_warn(DEV, "refusing to truncate a consistent device\n");
- retcode = ERR_DISK_TO_SMALL;
+ retcode = ERR_DISK_TOO_SMALL;
goto force_diskless_dec;
}
@@ -1336,17 +1337,34 @@ static int drbd_nl_detach(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
{
enum drbd_ret_code retcode;
int ret;
+ struct detach dt = {};
+
+ if (!detach_from_tags(mdev, nlp->tag_list, &dt)) {
+ reply->ret_code = ERR_MANDATORY_TAG;
+ goto out;
+ }
+
+ if (dt.detach_force) {
+ drbd_force_state(mdev, NS(disk, D_FAILED));
+ reply->ret_code = SS_SUCCESS;
+ goto out;
+ }
+
drbd_suspend_io(mdev); /* so no-one is stuck in drbd_al_begin_io */
+ drbd_md_get_buffer(mdev); /* make sure there is no in-flight meta-data IO */
retcode = drbd_request_state(mdev, NS(disk, D_FAILED));
+ drbd_md_put_buffer(mdev);
/* D_FAILED will transition to DISKLESS. */
ret = wait_event_interruptible(mdev->misc_wait,
mdev->state.disk != D_FAILED);
drbd_resume_io(mdev);
+
if ((int)retcode == (int)SS_IS_DISKLESS)
retcode = SS_NOTHING_TO_DO;
if (ret)
retcode = ERR_INTR;
reply->ret_code = retcode;
+out:
return 0;
}
@@ -1711,7 +1729,7 @@ static int drbd_nl_resize(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
if (rs.no_resync && mdev->agreed_pro_version < 93) {
retcode = ERR_NEED_APV_93;
- goto fail;
+ goto fail_ldev;
}
if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev))
@@ -1738,6 +1756,10 @@ static int drbd_nl_resize(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
fail:
reply->ret_code = retcode;
return 0;
+
+ fail_ldev:
+ put_ldev(mdev);
+ goto fail;
}
static int drbd_nl_syncer_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
@@ -1941,6 +1963,7 @@ static int drbd_nl_invalidate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nl
/* If there is still bitmap IO pending, probably because of a previous
* resync just being finished, wait for it before requesting a new resync. */
+ drbd_suspend_io(mdev);
wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED);
@@ -1959,6 +1982,7 @@ static int drbd_nl_invalidate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nl
retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
}
+ drbd_resume_io(mdev);
reply->ret_code = retcode;
return 0;
@@ -1980,6 +2004,7 @@ static int drbd_nl_invalidate_peer(struct drbd_conf *mdev, struct drbd_nl_cfg_re
/* If there is still bitmap IO pending, probably because of a previous
* resync just being finished, wait for it before requesting a new resync. */
+ drbd_suspend_io(mdev);
wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S), CS_ORDERED);
@@ -1998,6 +2023,7 @@ static int drbd_nl_invalidate_peer(struct drbd_conf *mdev, struct drbd_nl_cfg_re
} else
retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S));
}
+ drbd_resume_io(mdev);
reply->ret_code = retcode;
return 0;
@@ -2170,11 +2196,13 @@ static int drbd_nl_start_ov(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
/* If there is still bitmap IO pending, e.g. previous resync or verify
* just being finished, wait for it before requesting a new resync. */
+ drbd_suspend_io(mdev);
wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));
/* w_make_ov_request expects position to be aligned */
mdev->ov_start_sector = args.start_sector & ~BM_SECT_PER_BIT;
reply->ret_code = drbd_request_state(mdev,NS(conn,C_VERIFY_S));
+ drbd_resume_io(mdev);
return 0;
}
diff --git a/drivers/block/drbd/drbd_proc.c b/drivers/block/drbd/drbd_proc.c
index 2959cdfb77f..869bada2ed0 100644
--- a/drivers/block/drbd/drbd_proc.c
+++ b/drivers/block/drbd/drbd_proc.c
@@ -52,7 +52,7 @@ void seq_printf_with_thousands_grouping(struct seq_file *seq, long v)
if (unlikely(v >= 1000000)) {
/* cool: > GiByte/s */
seq_printf(seq, "%ld,", v / 1000000);
- v /= 1000000;
+ v %= 1000000;
seq_printf(seq, "%03ld,%03ld", v/1000, v % 1000);
} else if (likely(v >= 1000))
seq_printf(seq, "%ld,%03ld", v/1000, v % 1000);
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index 436f519bed1..ea4836e0ae9 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -466,6 +466,7 @@ static int drbd_accept(struct drbd_conf *mdev, const char **what,
goto out;
}
(*newsock)->ops = sock->ops;
+ __module_get((*newsock)->ops->owner);
out:
return err;
@@ -750,6 +751,7 @@ static int drbd_connect(struct drbd_conf *mdev)
{
struct socket *s, *sock, *msock;
int try, h, ok;
+ enum drbd_state_rv rv;
D_ASSERT(!mdev->data.socket);
@@ -888,25 +890,32 @@ retry:
}
}
- if (drbd_request_state(mdev, NS(conn, C_WF_REPORT_PARAMS)) < SS_SUCCESS)
- return 0;
-
sock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10;
sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
atomic_set(&mdev->packet_seq, 0);
mdev->peer_seq = 0;
- drbd_thread_start(&mdev->asender);
-
if (drbd_send_protocol(mdev) == -1)
return -1;
+ set_bit(STATE_SENT, &mdev->flags);
drbd_send_sync_param(mdev, &mdev->sync_conf);
drbd_send_sizes(mdev, 0, 0);
drbd_send_uuids(mdev);
- drbd_send_state(mdev);
+ drbd_send_current_state(mdev);
clear_bit(USE_DEGR_WFC_T, &mdev->flags);
clear_bit(RESIZE_PENDING, &mdev->flags);
+
+ spin_lock_irq(&mdev->req_lock);
+ rv = _drbd_set_state(_NS(mdev, conn, C_WF_REPORT_PARAMS), CS_VERBOSE, NULL);
+ if (mdev->state.conn != C_WF_REPORT_PARAMS)
+ clear_bit(STATE_SENT, &mdev->flags);
+ spin_unlock_irq(&mdev->req_lock);
+
+ if (rv < SS_SUCCESS)
+ return 0;
+
+ drbd_thread_start(&mdev->asender);
mod_timer(&mdev->request_timer, jiffies + HZ); /* just start it here. */
return 1;
@@ -957,7 +966,7 @@ static void drbd_flush(struct drbd_conf *mdev)
rv = blkdev_issue_flush(mdev->ldev->backing_bdev, GFP_KERNEL,
NULL);
if (rv) {
- dev_err(DEV, "local disk flush failed with status %d\n", rv);
+ dev_info(DEV, "local disk flush failed with status %d\n", rv);
/* would rather check on EOPNOTSUPP, but that is not reliable.
* don't try again for ANY return value != 0
* if (rv == -EOPNOTSUPP) */
@@ -1001,13 +1010,14 @@ static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *mdev,
if (epoch_size != 0 &&
atomic_read(&epoch->active) == 0 &&
- test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags)) {
+ (test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags) || ev & EV_CLEANUP)) {
if (!(ev & EV_CLEANUP)) {
spin_unlock(&mdev->epoch_lock);
drbd_send_b_ack(mdev, epoch->barrier_nr, epoch_size);
spin_lock(&mdev->epoch_lock);
}
- dec_unacked(mdev);
+ if (test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags))
+ dec_unacked(mdev);
if (mdev->current_epoch != epoch) {
next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list);
@@ -1096,7 +1106,11 @@ int drbd_submit_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e,
/* In most cases, we will only need one bio. But in case the lower
* level restrictions happen to be different at this offset on this
* side than those of the sending peer, we may need to submit the
- * request in more than one bio. */
+ * request in more than one bio.
+ *
+ * Plain bio_alloc is good enough here, this is no DRBD internally
+ * generated bio, but a bio allocated on behalf of the peer.
+ */
next_bio:
bio = bio_alloc(GFP_NOIO, nr_pages);
if (!bio) {
@@ -1583,6 +1597,24 @@ static int e_send_discard_ack(struct drbd_conf *mdev, struct drbd_work *w, int u
return ok;
}
+static bool overlapping_resync_write(struct drbd_conf *mdev, struct drbd_epoch_entry *data_e)
+{
+
+ struct drbd_epoch_entry *rs_e;
+ bool rv = 0;
+
+ spin_lock_irq(&mdev->req_lock);
+ list_for_each_entry(rs_e, &mdev->sync_ee, w.list) {
+ if (overlaps(data_e->sector, data_e->size, rs_e->sector, rs_e->size)) {
+ rv = 1;
+ break;
+ }
+ }
+ spin_unlock_irq(&mdev->req_lock);
+
+ return rv;
+}
+
/* Called from receive_Data.
* Synchronize packets on sock with packets on msock.
*
@@ -1826,6 +1858,9 @@ static int receive_Data(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned
list_add(&e->w.list, &mdev->active_ee);
spin_unlock_irq(&mdev->req_lock);
+ if (mdev->state.conn == C_SYNC_TARGET)
+ wait_event(mdev->ee_wait, !overlapping_resync_write(mdev, e));
+
switch (mdev->net_conf->wire_protocol) {
case DRBD_PROT_C:
inc_unacked(mdev);
@@ -2420,7 +2455,7 @@ static int drbd_uuid_compare(struct drbd_conf *mdev, int *rule_nr) __must_hold(l
mdev->p_uuid[UI_BITMAP] = mdev->p_uuid[UI_HISTORY_START];
mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_HISTORY_START + 1];
- dev_info(DEV, "Did not got last syncUUID packet, corrected:\n");
+ dev_info(DEV, "Lost last syncUUID packet, corrected:\n");
drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]);
return -1;
@@ -2806,10 +2841,10 @@ static int receive_SyncParam(struct drbd_conf *mdev, enum drbd_packets cmd, unsi
if (apv >= 88) {
if (apv == 88) {
- if (data_size > SHARED_SECRET_MAX) {
- dev_err(DEV, "verify-alg too long, "
- "peer wants %u, accepting only %u byte\n",
- data_size, SHARED_SECRET_MAX);
+ if (data_size > SHARED_SECRET_MAX || data_size == 0) {
+ dev_err(DEV, "verify-alg of wrong size, "
+ "peer wants %u, accepting only up to %u byte\n",
+ data_size, SHARED_SECRET_MAX);
return false;
}
@@ -3168,9 +3203,20 @@ static int receive_state(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned
os = ns = mdev->state;
spin_unlock_irq(&mdev->req_lock);
- /* peer says his disk is uptodate, while we think it is inconsistent,
- * and this happens while we think we have a sync going on. */
- if (os.pdsk == D_INCONSISTENT && real_peer_disk == D_UP_TO_DATE &&
+ /* If some other part of the code (asender thread, timeout)
+ * already decided to close the connection again,
+ * we must not "re-establish" it here. */
+ if (os.conn <= C_TEAR_DOWN)
+ return false;
+
+ /* If this is the "end of sync" confirmation, usually the peer disk
+ * transitions from D_INCONSISTENT to D_UP_TO_DATE. For empty (0 bits
+ * set) resync started in PausedSyncT, or if the timing of pause-/
+ * unpause-sync events has been "just right", the peer disk may
+ * transition from D_CONSISTENT to D_UP_TO_DATE as well.
+ */
+ if ((os.pdsk == D_INCONSISTENT || os.pdsk == D_CONSISTENT) &&
+ real_peer_disk == D_UP_TO_DATE &&
os.conn > C_CONNECTED && os.disk == D_UP_TO_DATE) {
/* If we are (becoming) SyncSource, but peer is still in sync
* preparation, ignore its uptodate-ness to avoid flapping, it
@@ -3288,7 +3334,7 @@ static int receive_state(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned
/* Nowadays only used when forcing a node into primary role and
setting its disk to UpToDate with that */
drbd_send_uuids(mdev);
- drbd_send_state(mdev);
+ drbd_send_current_state(mdev);
}
}
@@ -3776,6 +3822,13 @@ static void drbd_disconnect(struct drbd_conf *mdev)
if (mdev->state.conn == C_STANDALONE)
return;
+ /* We are about to start the cleanup after connection loss.
+ * Make sure drbd_make_request knows about that.
+ * Usually we should be in some network failure state already,
+ * but just in case we are not, we fix it up here.
+ */
+ drbd_force_state(mdev, NS(conn, C_NETWORK_FAILURE));
+
/* asender does not clean up anything. it must not interfere, either */
drbd_thread_stop(&mdev->asender);
drbd_free_sock(mdev);
@@ -3803,8 +3856,6 @@ static void drbd_disconnect(struct drbd_conf *mdev)
atomic_set(&mdev->rs_pending_cnt, 0);
wake_up(&mdev->misc_wait);
- del_timer(&mdev->request_timer);
-
/* make sure syncer is stopped and w_resume_next_sg queued */
del_timer_sync(&mdev->resync_timer);
resync_timer_fn((unsigned long)mdev);
@@ -4433,7 +4484,7 @@ static int got_BarrierAck(struct drbd_conf *mdev, struct p_header80 *h)
if (mdev->state.conn == C_AHEAD &&
atomic_read(&mdev->ap_in_flight) == 0 &&
- !test_and_set_bit(AHEAD_TO_SYNC_SOURCE, &mdev->current_epoch->flags)) {
+ !test_and_set_bit(AHEAD_TO_SYNC_SOURCE, &mdev->flags)) {
mdev->start_resync_timer.expires = jiffies + HZ;
add_timer(&mdev->start_resync_timer);
}
diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c
index 4a0f314086e..9c5c84946b0 100644
--- a/drivers/block/drbd/drbd_req.c
+++ b/drivers/block/drbd/drbd_req.c
@@ -37,6 +37,7 @@ static void _drbd_start_io_acct(struct drbd_conf *mdev, struct drbd_request *req
const int rw = bio_data_dir(bio);
int cpu;
cpu = part_stat_lock();
+ part_round_stats(cpu, &mdev->vdisk->part0);
part_stat_inc(cpu, &mdev->vdisk->part0, ios[rw]);
part_stat_add(cpu, &mdev->vdisk->part0, sectors[rw], bio_sectors(bio));
part_inc_in_flight(&mdev->vdisk->part0, rw);
@@ -214,8 +215,7 @@ void _req_may_be_done(struct drbd_request *req, struct bio_and_error *m)
{
const unsigned long s = req->rq_state;
struct drbd_conf *mdev = req->mdev;
- /* only WRITES may end up here without a master bio (on barrier ack) */
- int rw = req->master_bio ? bio_data_dir(req->master_bio) : WRITE;
+ int rw = req->rq_state & RQ_WRITE ? WRITE : READ;
/* we must not complete the master bio, while it is
* still being processed by _drbd_send_zc_bio (drbd_send_dblock)
@@ -230,7 +230,7 @@ void _req_may_be_done(struct drbd_request *req, struct bio_and_error *m)
return;
if (s & RQ_NET_PENDING)
return;
- if (s & RQ_LOCAL_PENDING)
+ if (s & RQ_LOCAL_PENDING && !(s & RQ_LOCAL_ABORTED))
return;
if (req->master_bio) {
@@ -277,6 +277,9 @@ void _req_may_be_done(struct drbd_request *req, struct bio_and_error *m)
req->master_bio = NULL;
}
+ if (s & RQ_LOCAL_PENDING)
+ return;
+
if ((s & RQ_NET_MASK) == 0 || (s & RQ_NET_DONE)) {
/* this is disconnected (local only) operation,
* or protocol C P_WRITE_ACK,
@@ -429,7 +432,7 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,
break;
case completed_ok:
- if (bio_data_dir(req->master_bio) == WRITE)
+ if (req->rq_state & RQ_WRITE)
mdev->writ_cnt += req->size>>9;
else
mdev->read_cnt += req->size>>9;
@@ -438,7 +441,14 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,
req->rq_state &= ~RQ_LOCAL_PENDING;
_req_may_be_done_not_susp(req, m);
- put_ldev(mdev);
+ break;
+
+ case abort_disk_io:
+ req->rq_state |= RQ_LOCAL_ABORTED;
+ if (req->rq_state & RQ_WRITE)
+ _req_may_be_done_not_susp(req, m);
+ else
+ goto goto_queue_for_net_read;
break;
case write_completed_with_error:
@@ -447,7 +457,6 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,
__drbd_chk_io_error(mdev, false);
_req_may_be_done_not_susp(req, m);
- put_ldev(mdev);
break;
case read_ahead_completed_with_error:
@@ -455,7 +464,6 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,
req->rq_state |= RQ_LOCAL_COMPLETED;
req->rq_state &= ~RQ_LOCAL_PENDING;
_req_may_be_done_not_susp(req, m);
- put_ldev(mdev);
break;
case read_completed_with_error:
@@ -467,7 +475,8 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,
D_ASSERT(!(req->rq_state & RQ_NET_MASK));
__drbd_chk_io_error(mdev, false);
- put_ldev(mdev);
+
+ goto_queue_for_net_read:
/* no point in retrying if there is no good remote data,
* or we have no connection. */
@@ -556,10 +565,8 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,
drbd_queue_work(&mdev->data.work, &req->w);
break;
- case oos_handed_to_network:
- /* actually the same */
+ case read_retry_remote_canceled:
case send_canceled:
- /* treat it the same */
case send_failed:
/* real cleanup will be done from tl_clear. just update flags
* so it is no longer marked as on the worker queue */
@@ -589,17 +596,17 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,
}
req->rq_state &= ~RQ_NET_QUEUED;
req->rq_state |= RQ_NET_SENT;
- /* because _drbd_send_zc_bio could sleep, and may want to
- * dereference the bio even after the "write_acked_by_peer" and
- * "completed_ok" events came in, once we return from
- * _drbd_send_zc_bio (drbd_send_dblock), we have to check
- * whether it is done already, and end it. */
_req_may_be_done_not_susp(req, m);
break;
- case read_retry_remote_canceled:
+ case oos_handed_to_network:
+ /* Was not set PENDING, no longer QUEUED, so is now DONE
+ * as far as this connection is concerned. */
req->rq_state &= ~RQ_NET_QUEUED;
- /* fall through, in case we raced with drbd_disconnect */
+ req->rq_state |= RQ_NET_DONE;
+ _req_may_be_done_not_susp(req, m);
+ break;
+
case connection_lost_while_pending:
/* transfer log cleanup after connection loss */
/* assert something? */
@@ -616,8 +623,6 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,
_req_may_be_done(req, m); /* Allowed while state.susp */
break;
- case write_acked_by_peer_and_sis:
- req->rq_state |= RQ_NET_SIS;
case conflict_discarded_by_peer:
/* for discarded conflicting writes of multiple primaries,
* there is no need to keep anything in the tl, potential
@@ -628,18 +633,15 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,
(unsigned long long)req->sector, req->size);
req->rq_state |= RQ_NET_DONE;
/* fall through */
+ case write_acked_by_peer_and_sis:
case write_acked_by_peer:
+ if (what == write_acked_by_peer_and_sis)
+ req->rq_state |= RQ_NET_SIS;
/* protocol C; successfully written on peer.
- * Nothing to do here.
+ * Nothing more to do here.
* We want to keep the tl in place for all protocols, to cater
- * for volatile write-back caches on lower level devices.
- *
- * A barrier request is expected to have forced all prior
- * requests onto stable storage, so completion of a barrier
- * request could set NET_DONE right here, and not wait for the
- * P_BARRIER_ACK, but that is an unnecessary optimization. */
+ * for volatile write-back caches on lower level devices. */
- /* this makes it effectively the same as for: */
case recv_acked_by_peer:
/* protocol B; pretends to be successfully written on peer.
* see also notes above in handed_over_to_network about
@@ -773,6 +775,7 @@ static int drbd_make_request_common(struct drbd_conf *mdev, struct bio *bio, uns
int local, remote, send_oos = 0;
int err = -EIO;
int ret = 0;
+ union drbd_state s;
/* allocate outside of all locks; */
req = drbd_req_new(mdev, bio);
@@ -834,8 +837,9 @@ static int drbd_make_request_common(struct drbd_conf *mdev, struct bio *bio, uns
drbd_al_begin_io(mdev, sector);
}
- remote = remote && drbd_should_do_remote(mdev->state);
- send_oos = rw == WRITE && drbd_should_send_oos(mdev->state);
+ s = mdev->state;
+ remote = remote && drbd_should_do_remote(s);
+ send_oos = rw == WRITE && drbd_should_send_oos(s);
D_ASSERT(!(remote && send_oos));
if (!(local || remote) && !is_susp(mdev->state)) {
@@ -867,7 +871,7 @@ allocate_barrier:
if (is_susp(mdev->state)) {
/* If we got suspended, use the retry mechanism of
- generic_make_request() to restart processing of this
+ drbd_make_request() to restart processing of this
bio. In the next call to drbd_make_request
we sleep in inc_ap_bio() */
ret = 1;
@@ -1091,7 +1095,6 @@ void drbd_make_request(struct request_queue *q, struct bio *bio)
*/
D_ASSERT(bio->bi_size > 0);
D_ASSERT((bio->bi_size & 0x1ff) == 0);
- D_ASSERT(bio->bi_idx == 0);
/* to make some things easier, force alignment of requests within the
* granularity of our hash tables */
@@ -1099,8 +1102,9 @@ void drbd_make_request(struct request_queue *q, struct bio *bio)
e_enr = (bio->bi_sector+(bio->bi_size>>9)-1) >> HT_SHIFT;
if (likely(s_enr == e_enr)) {
- inc_ap_bio(mdev, 1);
- drbd_make_request_common(mdev, bio, start_time);
+ do {
+ inc_ap_bio(mdev, 1);
+ } while (drbd_make_request_common(mdev, bio, start_time));
return;
}
@@ -1196,36 +1200,66 @@ void request_timer_fn(unsigned long data)
struct drbd_conf *mdev = (struct drbd_conf *) data;
struct drbd_request *req; /* oldest request */
struct list_head *le;
- unsigned long et = 0; /* effective timeout = ko_count * timeout */
+ unsigned long ent = 0, dt = 0, et, nt; /* effective timeout = ko_count * timeout */
+ unsigned long now;
if (get_net_conf(mdev)) {
- et = mdev->net_conf->timeout*HZ/10 * mdev->net_conf->ko_count;
+ if (mdev->state.conn >= C_WF_REPORT_PARAMS)
+ ent = mdev->net_conf->timeout*HZ/10
+ * mdev->net_conf->ko_count;
put_net_conf(mdev);
}
- if (!et || mdev->state.conn < C_WF_REPORT_PARAMS)
+ if (get_ldev(mdev)) { /* implicit state.disk >= D_INCONSISTENT */
+ dt = mdev->ldev->dc.disk_timeout * HZ / 10;
+ put_ldev(mdev);
+ }
+ et = min_not_zero(dt, ent);
+
+ if (!et)
return; /* Recurring timer stopped */
+ now = jiffies;
+
spin_lock_irq(&mdev->req_lock);
le = &mdev->oldest_tle->requests;
if (list_empty(le)) {
spin_unlock_irq(&mdev->req_lock);
- mod_timer(&mdev->request_timer, jiffies + et);
+ mod_timer(&mdev->request_timer, now + et);
return;
}
le = le->prev;
req = list_entry(le, struct drbd_request, tl_requests);
- if (time_is_before_eq_jiffies(req->start_time + et)) {
- if (req->rq_state & RQ_NET_PENDING) {
- dev_warn(DEV, "Remote failed to finish a request within ko-count * timeout\n");
- _drbd_set_state(_NS(mdev, conn, C_TIMEOUT), CS_VERBOSE, NULL);
- } else {
- dev_warn(DEV, "Local backing block device frozen?\n");
- mod_timer(&mdev->request_timer, jiffies + et);
- }
- } else {
- mod_timer(&mdev->request_timer, req->start_time + et);
- }
+ /* The request is considered timed out, if
+ * - we have some effective timeout from the configuration,
+ * with above state restrictions applied,
+ * - the oldest request is waiting for a response from the network
+ * resp. the local disk,
+ * - the oldest request is in fact older than the effective timeout,
+ * - the connection was established (resp. disk was attached)
+ * for longer than the timeout already.
+ * Note that for 32bit jiffies and very stable connections/disks,
+ * we may have a wrap around, which is catched by
+ * !time_in_range(now, last_..._jif, last_..._jif + timeout).
+ *
+ * Side effect: once per 32bit wrap-around interval, which means every
+ * ~198 days with 250 HZ, we have a window where the timeout would need
+ * to expire twice (worst case) to become effective. Good enough.
+ */
+ if (ent && req->rq_state & RQ_NET_PENDING &&
+ time_after(now, req->start_time + ent) &&
+ !time_in_range(now, mdev->last_reconnect_jif, mdev->last_reconnect_jif + ent)) {
+ dev_warn(DEV, "Remote failed to finish a request within ko-count * timeout\n");
+ _drbd_set_state(_NS(mdev, conn, C_TIMEOUT), CS_VERBOSE | CS_HARD, NULL);
+ }
+ if (dt && req->rq_state & RQ_LOCAL_PENDING &&
+ time_after(now, req->start_time + dt) &&
+ !time_in_range(now, mdev->last_reattach_jif, mdev->last_reattach_jif + dt)) {
+ dev_warn(DEV, "Local backing device failed to meet the disk-timeout\n");
+ __drbd_chk_io_error(mdev, 1);
+ }
+ nt = (time_after(now, req->start_time + et) ? now : req->start_time) + et;
spin_unlock_irq(&mdev->req_lock);
+ mod_timer(&mdev->request_timer, nt);
}
diff --git a/drivers/block/drbd/drbd_req.h b/drivers/block/drbd/drbd_req.h
index 68a234a5fdc..3d211191948 100644
--- a/drivers/block/drbd/drbd_req.h
+++ b/drivers/block/drbd/drbd_req.h
@@ -105,6 +105,7 @@ enum drbd_req_event {
read_completed_with_error,
read_ahead_completed_with_error,
write_completed_with_error,
+ abort_disk_io,
completed_ok,
resend,
fail_frozen_disk_io,
@@ -118,18 +119,21 @@ enum drbd_req_event {
* same time, so we should hold the request lock anyways.
*/
enum drbd_req_state_bits {
- /* 210
- * 000: no local possible
- * 001: to be submitted
+ /* 3210
+ * 0000: no local possible
+ * 0001: to be submitted
* UNUSED, we could map: 011: submitted, completion still pending
- * 110: completed ok
- * 010: completed with error
+ * 0110: completed ok
+ * 0010: completed with error
+ * 1001: Aborted (before completion)
+ * 1x10: Aborted and completed -> free
*/
__RQ_LOCAL_PENDING,
__RQ_LOCAL_COMPLETED,
__RQ_LOCAL_OK,
+ __RQ_LOCAL_ABORTED,
- /* 76543
+ /* 87654
* 00000: no network possible
* 00001: to be send
* 00011: to be send, on worker queue
@@ -199,8 +203,9 @@ enum drbd_req_state_bits {
#define RQ_LOCAL_PENDING (1UL << __RQ_LOCAL_PENDING)
#define RQ_LOCAL_COMPLETED (1UL << __RQ_LOCAL_COMPLETED)
#define RQ_LOCAL_OK (1UL << __RQ_LOCAL_OK)
+#define RQ_LOCAL_ABORTED (1UL << __RQ_LOCAL_ABORTED)
-#define RQ_LOCAL_MASK ((RQ_LOCAL_OK << 1)-1) /* 0x07 */
+#define RQ_LOCAL_MASK ((RQ_LOCAL_ABORTED << 1)-1)
#define RQ_NET_PENDING (1UL << __RQ_NET_PENDING)
#define RQ_NET_QUEUED (1UL << __RQ_NET_QUEUED)
diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c
index 4d3e6f6213b..620c70ff223 100644
--- a/drivers/block/drbd/drbd_worker.c
+++ b/drivers/block/drbd/drbd_worker.c
@@ -70,11 +70,29 @@ rwlock_t global_state_lock;
void drbd_md_io_complete(struct bio *bio, int error)
{
struct drbd_md_io *md_io;
+ struct drbd_conf *mdev;
md_io = (struct drbd_md_io *)bio->bi_private;
+ mdev = container_of(md_io, struct drbd_conf, md_io);
+
md_io->error = error;
- complete(&md_io->event);
+ /* We grabbed an extra reference in _drbd_md_sync_page_io() to be able
+ * to timeout on the lower level device, and eventually detach from it.
+ * If this io completion runs after that timeout expired, this
+ * drbd_md_put_buffer() may allow us to finally try and re-attach.
+ * During normal operation, this only puts that extra reference
+ * down to 1 again.
+ * Make sure we first drop the reference, and only then signal
+ * completion, or we may (in drbd_al_read_log()) cycle so fast into the
+ * next drbd_md_sync_page_io(), that we trigger the
+ * ASSERT(atomic_read(&mdev->md_io_in_use) == 1) there.
+ */
+ drbd_md_put_buffer(mdev);
+ md_io->done = 1;
+ wake_up(&mdev->misc_wait);
+ bio_put(bio);
+ put_ldev(mdev);
}
/* reads on behalf of the partner,
@@ -226,6 +244,7 @@ void drbd_endio_pri(struct bio *bio, int error)
spin_lock_irqsave(&mdev->req_lock, flags);
__req_mod(req, what, &m);
spin_unlock_irqrestore(&mdev->req_lock, flags);
+ put_ldev(mdev);
if (m.bio)
complete_master_bio(mdev, &m);
@@ -290,7 +309,7 @@ void drbd_csum_bio(struct drbd_conf *mdev, struct crypto_hash *tfm, struct bio *
sg_init_table(&sg, 1);
crypto_hash_init(&desc);
- __bio_for_each_segment(bvec, bio, i, 0) {
+ bio_for_each_segment(bvec, bio, i) {
sg_set_page(&sg, bvec->bv_page, bvec->bv_len, bvec->bv_offset);
crypto_hash_update(&desc, &sg, sg.length);
}
@@ -728,7 +747,7 @@ int w_start_resync(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
}
drbd_start_resync(mdev, C_SYNC_SOURCE);
- clear_bit(AHEAD_TO_SYNC_SOURCE, &mdev->current_epoch->flags);
+ clear_bit(AHEAD_TO_SYNC_SOURCE, &mdev->flags);
return 1;
}
@@ -1519,14 +1538,14 @@ void drbd_start_resync(struct drbd_conf *mdev, enum drbd_conns side)
}
drbd_state_lock(mdev);
-
+ write_lock_irq(&global_state_lock);
if (!get_ldev_if_state(mdev, D_NEGOTIATING)) {
+ write_unlock_irq(&global_state_lock);
drbd_state_unlock(mdev);
return;
}
- write_lock_irq(&global_state_lock);
- ns = mdev->state;
+ ns.i = mdev->state.i;
ns.aftr_isp = !_drbd_may_sync_now(mdev);
diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index b0b00d70c16..cce7df367b7 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -551,7 +551,7 @@ static void floppy_ready(void);
static void floppy_start(void);
static void process_fd_request(void);
static void recalibrate_floppy(void);
-static void floppy_shutdown(unsigned long);
+static void floppy_shutdown(struct work_struct *);
static int floppy_request_regions(int);
static void floppy_release_regions(int);
@@ -588,6 +588,8 @@ static int buffer_max = -1;
static struct floppy_fdc_state fdc_state[N_FDC];
static int fdc; /* current fdc */
+static struct workqueue_struct *floppy_wq;
+
static struct floppy_struct *_floppy = floppy_type;
static unsigned char current_drive;
static long current_count_sectors;
@@ -629,16 +631,15 @@ static inline void set_debugt(void) { }
static inline void debugt(const char *func, const char *msg) { }
#endif /* DEBUGT */
-typedef void (*timeout_fn)(unsigned long);
-static DEFINE_TIMER(fd_timeout, floppy_shutdown, 0, 0);
+static DECLARE_DELAYED_WORK(fd_timeout, floppy_shutdown);
static const char *timeout_message;
static void is_alive(const char *func, const char *message)
{
/* this routine checks whether the floppy driver is "alive" */
if (test_bit(0, &fdc_busy) && command_status < 2 &&
- !timer_pending(&fd_timeout)) {
+ !delayed_work_pending(&fd_timeout)) {
DPRINT("%s: timeout handler died. %s\n", func, message);
}
}
@@ -666,15 +667,18 @@ static int output_log_pos;
static void __reschedule_timeout(int drive, const char *message)
{
+ unsigned long delay;
+
if (drive == current_reqD)
drive = current_drive;
- del_timer(&fd_timeout);
+
if (drive < 0 || drive >= N_DRIVE) {
- fd_timeout.expires = jiffies + 20UL * HZ;
+ delay = 20UL * HZ;
drive = 0;
} else
- fd_timeout.expires = jiffies + UDP->timeout;
- add_timer(&fd_timeout);
+ delay = UDP->timeout;
+
+ queue_delayed_work(floppy_wq, &fd_timeout, delay);
if (UDP->flags & FD_DEBUG)
DPRINT("reschedule timeout %s\n", message);
timeout_message = message;
@@ -872,7 +876,7 @@ static int lock_fdc(int drive, bool interruptible)
command_status = FD_COMMAND_NONE;
- __reschedule_timeout(drive, "lock fdc");
+ reschedule_timeout(drive, "lock fdc");
set_fdc(drive);
return 0;
}
@@ -880,23 +884,15 @@ static int lock_fdc(int drive, bool interruptible)
/* unlocks the driver */
static void unlock_fdc(void)
{
- unsigned long flags;
-
- raw_cmd = NULL;
if (!test_bit(0, &fdc_busy))
DPRINT("FDC access conflict!\n");
- if (do_floppy)
- DPRINT("device interrupt still active at FDC release: %pf!\n",
- do_floppy);
+ raw_cmd = NULL;
command_status = FD_COMMAND_NONE;
- spin_lock_irqsave(&floppy_lock, flags);
- del_timer(&fd_timeout);
+ __cancel_delayed_work(&fd_timeout);
+ do_floppy = NULL;
cont = NULL;
clear_bit(0, &fdc_busy);
- if (current_req || set_next_request())
- do_fd_request(current_req->q);
- spin_unlock_irqrestore(&floppy_lock, flags);
wake_up(&fdc_wait);
}
@@ -968,26 +964,24 @@ static DECLARE_WORK(floppy_work, NULL);
static void schedule_bh(void (*handler)(void))
{
+ WARN_ON(work_pending(&floppy_work));
+
PREPARE_WORK(&floppy_work, (work_func_t)handler);
- schedule_work(&floppy_work);
+ queue_work(floppy_wq, &floppy_work);
}
-static DEFINE_TIMER(fd_timer, NULL, 0, 0);
+static DECLARE_DELAYED_WORK(fd_timer, NULL);
static void cancel_activity(void)
{
- unsigned long flags;
-
- spin_lock_irqsave(&floppy_lock, flags);
do_floppy = NULL;
- PREPARE_WORK(&floppy_work, (work_func_t)empty);
- del_timer(&fd_timer);
- spin_unlock_irqrestore(&floppy_lock, flags);
+ cancel_delayed_work_sync(&fd_timer);
+ cancel_work_sync(&floppy_work);
}
/* this function makes sure that the disk stays in the drive during the
* transfer */
-static void fd_watchdog(void)
+static void fd_watchdog(struct work_struct *arg)
{
debug_dcl(DP->flags, "calling disk change from watchdog\n");
@@ -997,21 +991,20 @@ static void fd_watchdog(void)
cont->done(0);
reset_fdc();
} else {
- del_timer(&fd_timer);
- fd_timer.function = (timeout_fn)fd_watchdog;
- fd_timer.expires = jiffies + HZ / 10;
- add_timer(&fd_timer);
+ cancel_delayed_work(&fd_timer);
+ PREPARE_DELAYED_WORK(&fd_timer, fd_watchdog);
+ queue_delayed_work(floppy_wq, &fd_timer, HZ / 10);
}
}
static void main_command_interrupt(void)
{
- del_timer(&fd_timer);
+ cancel_delayed_work(&fd_timer);
cont->interrupt();
}
/* waits for a delay (spinup or select) to pass */
-static int fd_wait_for_completion(unsigned long delay, timeout_fn function)
+static int fd_wait_for_completion(unsigned long expires, work_func_t function)
{
if (FDCS->reset) {
reset_fdc(); /* do the reset during sleep to win time
@@ -1020,11 +1013,10 @@ static int fd_wait_for_completion(unsigned long delay, timeout_fn function)
return 1;
}
- if (time_before(jiffies, delay)) {
- del_timer(&fd_timer);
- fd_timer.function = function;
- fd_timer.expires = delay;
- add_timer(&fd_timer);
+ if (time_before(jiffies, expires)) {
+ cancel_delayed_work(&fd_timer);
+ PREPARE_DELAYED_WORK(&fd_timer, function);
+ queue_delayed_work(floppy_wq, &fd_timer, expires - jiffies);
return 1;
}
return 0;
@@ -1342,7 +1334,7 @@ static int fdc_dtr(void)
*/
FDCS->dtr = raw_cmd->rate & 3;
return fd_wait_for_completion(jiffies + 2UL * HZ / 100,
- (timeout_fn)floppy_ready);
+ (work_func_t)floppy_ready);
} /* fdc_dtr */
static void tell_sector(void)
@@ -1447,7 +1439,7 @@ static void setup_rw_floppy(void)
int flags;
int dflags;
unsigned long ready_date;
- timeout_fn function;
+ work_func_t function;
flags = raw_cmd->flags;
if (flags & (FD_RAW_READ | FD_RAW_WRITE))
@@ -1461,9 +1453,9 @@ static void setup_rw_floppy(void)
*/
if (time_after(ready_date, jiffies + DP->select_delay)) {
ready_date -= DP->select_delay;
- function = (timeout_fn)floppy_start;
+ function = (work_func_t)floppy_start;
} else
- function = (timeout_fn)setup_rw_floppy;
+ function = (work_func_t)setup_rw_floppy;
/* wait until the floppy is spinning fast enough */
if (fd_wait_for_completion(ready_date, function))
@@ -1493,7 +1485,7 @@ static void setup_rw_floppy(void)
inr = result();
cont->interrupt();
} else if (flags & FD_RAW_NEED_DISK)
- fd_watchdog();
+ fd_watchdog(NULL);
}
static int blind_seek;
@@ -1802,20 +1794,22 @@ static void show_floppy(void)
pr_info("do_floppy=%pf\n", do_floppy);
if (work_pending(&floppy_work))
pr_info("floppy_work.func=%pf\n", floppy_work.func);
- if (timer_pending(&fd_timer))
- pr_info("fd_timer.function=%pf\n", fd_timer.function);
- if (timer_pending(&fd_timeout)) {
- pr_info("timer_function=%pf\n", fd_timeout.function);
- pr_info("expires=%lu\n", fd_timeout.expires - jiffies);
- pr_info("now=%lu\n", jiffies);
- }
+ if (delayed_work_pending(&fd_timer))
+ pr_info("delayed work.function=%p expires=%ld\n",
+ fd_timer.work.func,
+ fd_timer.timer.expires - jiffies);
+ if (delayed_work_pending(&fd_timeout))
+ pr_info("timer_function=%p expires=%ld\n",
+ fd_timeout.work.func,
+ fd_timeout.timer.expires - jiffies);
+
pr_info("cont=%p\n", cont);
pr_info("current_req=%p\n", current_req);
pr_info("command_status=%d\n", command_status);
pr_info("\n");
}
-static void floppy_shutdown(unsigned long data)
+static void floppy_shutdown(struct work_struct *arg)
{
unsigned long flags;
@@ -1868,7 +1862,7 @@ static int start_motor(void (*function)(void))
/* wait_for_completion also schedules reset if needed. */
return fd_wait_for_completion(DRS->select_date + DP->select_delay,
- (timeout_fn)function);
+ (work_func_t)function);
}
static void floppy_ready(void)
@@ -2821,7 +2815,6 @@ do_request:
spin_lock_irq(&floppy_lock);
pending = set_next_request();
spin_unlock_irq(&floppy_lock);
-
if (!pending) {
do_floppy = NULL;
unlock_fdc();
@@ -2898,13 +2891,15 @@ static void do_fd_request(struct request_queue *q)
current_req->cmd_flags))
return;
- if (test_bit(0, &fdc_busy)) {
+ if (test_and_set_bit(0, &fdc_busy)) {
/* fdc busy, this new request will be treated when the
current one is done */
is_alive(__func__, "old request running");
return;
}
- lock_fdc(MAXTIMEOUT, false);
+ command_status = FD_COMMAND_NONE;
+ __reschedule_timeout(MAXTIMEOUT, "fd_request");
+ set_fdc(0);
process_fd_request();
is_alive(__func__, "");
}
@@ -3612,9 +3607,7 @@ static int floppy_release(struct gendisk *disk, fmode_t mode)
mutex_lock(&floppy_mutex);
mutex_lock(&open_lock);
- if (UDRS->fd_ref < 0)
- UDRS->fd_ref = 0;
- else if (!UDRS->fd_ref--) {
+ if (!UDRS->fd_ref--) {
DPRINT("floppy_release with fd_ref == 0");
UDRS->fd_ref = 0;
}
@@ -3650,13 +3643,7 @@ static int floppy_open(struct block_device *bdev, fmode_t mode)
set_bit(FD_VERIFY_BIT, &UDRS->flags);
}
- if (UDRS->fd_ref == -1 || (UDRS->fd_ref && (mode & FMODE_EXCL)))
- goto out2;
-
- if (mode & FMODE_EXCL)
- UDRS->fd_ref = -1;
- else
- UDRS->fd_ref++;
+ UDRS->fd_ref++;
opened_bdev[drive] = bdev;
@@ -3719,10 +3706,8 @@ static int floppy_open(struct block_device *bdev, fmode_t mode)
mutex_unlock(&floppy_mutex);
return 0;
out:
- if (UDRS->fd_ref < 0)
- UDRS->fd_ref = 0;
- else
- UDRS->fd_ref--;
+ UDRS->fd_ref--;
+
if (!UDRS->fd_ref)
opened_bdev[drive] = NULL;
out2:
@@ -4159,10 +4144,16 @@ static int __init floppy_init(void)
goto out_put_disk;
}
+ floppy_wq = alloc_ordered_workqueue("floppy", 0);
+ if (!floppy_wq) {
+ err = -ENOMEM;
+ goto out_put_disk;
+ }
+
disks[dr]->queue = blk_init_queue(do_fd_request, &floppy_lock);
if (!disks[dr]->queue) {
err = -ENOMEM;
- goto out_put_disk;
+ goto out_destroy_workq;
}
blk_queue_max_hw_sectors(disks[dr]->queue, 64);
@@ -4213,7 +4204,7 @@ static int __init floppy_init(void)
use_virtual_dma = can_use_virtual_dma & 1;
fdc_state[0].address = FDC1;
if (fdc_state[0].address == -1) {
- del_timer_sync(&fd_timeout);
+ cancel_delayed_work(&fd_timeout);
err = -ENODEV;
goto out_unreg_region;
}
@@ -4224,7 +4215,7 @@ static int __init floppy_init(void)
fdc = 0; /* reset fdc in case of unexpected interrupt */
err = floppy_grab_irq_and_dma();
if (err) {
- del_timer_sync(&fd_timeout);
+ cancel_delayed_work(&fd_timeout);
err = -EBUSY;
goto out_unreg_region;
}
@@ -4281,13 +4272,13 @@ static int __init floppy_init(void)
user_reset_fdc(-1, FD_RESET_ALWAYS, false);
}
fdc = 0;
- del_timer_sync(&fd_timeout);
+ cancel_delayed_work(&fd_timeout);
current_drive = 0;
initialized = true;
if (have_no_fdc) {
DPRINT("no floppy controllers found\n");
err = have_no_fdc;
- goto out_flush_work;
+ goto out_release_dma;
}
for (drive = 0; drive < N_DRIVE; drive++) {
@@ -4302,7 +4293,7 @@ static int __init floppy_init(void)
err = platform_device_register(&floppy_device[drive]);
if (err)
- goto out_flush_work;
+ goto out_release_dma;
err = device_create_file(&floppy_device[drive].dev,
&dev_attr_cmos);
@@ -4320,13 +4311,14 @@ static int __init floppy_init(void)
out_unreg_platform_dev:
platform_device_unregister(&floppy_device[drive]);
-out_flush_work:
- flush_work_sync(&floppy_work);
+out_release_dma:
if (atomic_read(&usage_count))
floppy_release_irq_and_dma();
out_unreg_region:
blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
platform_driver_unregister(&floppy_driver);
+out_destroy_workq:
+ destroy_workqueue(floppy_wq);
out_unreg_blkdev:
unregister_blkdev(FLOPPY_MAJOR, "fd");
out_put_disk:
@@ -4397,7 +4389,7 @@ static int floppy_grab_irq_and_dma(void)
* We might have scheduled a free_irq(), wait it to
* drain first:
*/
- flush_work_sync(&floppy_work);
+ flush_workqueue(floppy_wq);
if (fd_request_irq()) {
DPRINT("Unable to grab IRQ%d for the floppy driver\n",
@@ -4488,9 +4480,9 @@ static void floppy_release_irq_and_dma(void)
pr_info("motor off timer %d still active\n", drive);
#endif
- if (timer_pending(&fd_timeout))
+ if (delayed_work_pending(&fd_timeout))
pr_info("floppy timer still active:%s\n", timeout_message);
- if (timer_pending(&fd_timer))
+ if (delayed_work_pending(&fd_timer))
pr_info("auxiliary floppy timer still active\n");
if (work_pending(&floppy_work))
pr_info("work still pending\n");
@@ -4560,8 +4552,9 @@ static void __exit floppy_module_exit(void)
put_disk(disks[drive]);
}
- del_timer_sync(&fd_timeout);
- del_timer_sync(&fd_timer);
+ cancel_delayed_work_sync(&fd_timeout);
+ cancel_delayed_work_sync(&fd_timer);
+ destroy_workqueue(floppy_wq);
if (atomic_read(&usage_count))
floppy_release_irq_and_dma();
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index 4e86393a09c..60eed4bdd2e 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -526,6 +526,14 @@ static int xen_translate_vdev(int vdevice, int *minor, unsigned int *offset)
return 0;
}
+static char *encode_disk_name(char *ptr, unsigned int n)
+{
+ if (n >= 26)
+ ptr = encode_disk_name(ptr, n / 26 - 1);
+ *ptr = 'a' + n % 26;
+ return ptr + 1;
+}
+
static int xlvbd_alloc_gendisk(blkif_sector_t capacity,
struct blkfront_info *info,
u16 vdisk_info, u16 sector_size)
@@ -536,6 +544,7 @@ static int xlvbd_alloc_gendisk(blkif_sector_t capacity,
unsigned int offset;
int minor;
int nr_parts;
+ char *ptr;
BUG_ON(info->gd != NULL);
BUG_ON(info->rq != NULL);
@@ -560,7 +569,11 @@ static int xlvbd_alloc_gendisk(blkif_sector_t capacity,
"emulated IDE disks,\n\t choose an xvd device name"
"from xvde on\n", info->vdevice);
}
- err = -ENODEV;
+ if (minor >> MINORBITS) {
+ pr_warn("blkfront: %#x's minor (%#x) out of range; ignoring\n",
+ info->vdevice, minor);
+ return -ENODEV;
+ }
if ((minor % nr_parts) == 0)
nr_minors = nr_parts;
@@ -574,23 +587,14 @@ static int xlvbd_alloc_gendisk(blkif_sector_t capacity,
if (gd == NULL)
goto release;
- if (nr_minors > 1) {
- if (offset < 26)
- sprintf(gd->disk_name, "%s%c", DEV_NAME, 'a' + offset);
- else
- sprintf(gd->disk_name, "%s%c%c", DEV_NAME,
- 'a' + ((offset / 26)-1), 'a' + (offset % 26));
- } else {
- if (offset < 26)
- sprintf(gd->disk_name, "%s%c%d", DEV_NAME,
- 'a' + offset,
- minor & (nr_parts - 1));
- else
- sprintf(gd->disk_name, "%s%c%c%d", DEV_NAME,
- 'a' + ((offset / 26) - 1),
- 'a' + (offset % 26),
- minor & (nr_parts - 1));
- }
+ strcpy(gd->disk_name, DEV_NAME);
+ ptr = encode_disk_name(gd->disk_name + sizeof(DEV_NAME) - 1, offset);
+ BUG_ON(ptr >= gd->disk_name + DISK_NAME_LEN);
+ if (nr_minors > 1)
+ *ptr = 0;
+ else
+ snprintf(ptr, gd->disk_name + DISK_NAME_LEN - ptr,
+ "%d", minor & (nr_parts - 1));
gd->major = XENVBD_MAJOR;
gd->first_minor = minor;
@@ -1496,7 +1500,9 @@ module_init(xlblk_init);
static void __exit xlblk_exit(void)
{
- return xenbus_unregister_driver(&blkfront_driver);
+ xenbus_unregister_driver(&blkfront_driver);
+ unregister_blkdev(XENVBD_MAJOR, DEV_NAME);
+ kfree(minors);
}
module_exit(xlblk_exit);
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 92cea9d77ec..08a7aa722d6 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -2116,7 +2116,7 @@ out:
return ret;
}
-static int format_check(struct drm_mode_fb_cmd2 *r)
+static int format_check(const struct drm_mode_fb_cmd2 *r)
{
uint32_t format = r->pixel_format & ~DRM_FORMAT_BIG_ENDIAN;
@@ -2185,7 +2185,7 @@ static int format_check(struct drm_mode_fb_cmd2 *r)
}
}
-static int framebuffer_check(struct drm_mode_fb_cmd2 *r)
+static int framebuffer_check(const struct drm_mode_fb_cmd2 *r)
{
int ret, hsub, vsub, num_planes, i;
@@ -3126,7 +3126,7 @@ int drm_mode_connector_update_edid_property(struct drm_connector *connector,
EXPORT_SYMBOL(drm_mode_connector_update_edid_property);
static bool drm_property_change_is_valid(struct drm_property *property,
- __u64 value)
+ uint64_t value)
{
if (property->flags & DRM_MODE_PROP_IMMUTABLE)
return false;
@@ -3136,7 +3136,7 @@ static bool drm_property_change_is_valid(struct drm_property *property,
return true;
} else if (property->flags & DRM_MODE_PROP_BITMASK) {
int i;
- __u64 valid_mask = 0;
+ uint64_t valid_mask = 0;
for (i = 0; i < property->num_values; i++)
valid_mask |= (1ULL << property->values[i]);
return !(value & ~valid_mask);
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 608bddfc7e3..c3b5139eba7 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -66,6 +66,8 @@
#define EDID_QUIRK_FIRST_DETAILED_PREFERRED (1 << 5)
/* use +hsync +vsync for detailed mode */
#define EDID_QUIRK_DETAILED_SYNC_PP (1 << 6)
+/* Force reduced-blanking timings for detailed modes */
+#define EDID_QUIRK_FORCE_REDUCED_BLANKING (1 << 7)
struct detailed_mode_closure {
struct drm_connector *connector;
@@ -120,6 +122,9 @@ static struct edid_quirk {
/* Samsung SyncMaster 22[5-6]BW */
{ "SAM", 596, EDID_QUIRK_PREFER_LARGE_60 },
{ "SAM", 638, EDID_QUIRK_PREFER_LARGE_60 },
+
+ /* ViewSonic VA2026w */
+ { "VSC", 5020, EDID_QUIRK_FORCE_REDUCED_BLANKING },
};
/*** DDC fetch and block validation ***/
@@ -885,12 +890,19 @@ static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev,
"Wrong Hsync/Vsync pulse width\n");
return NULL;
}
+
+ if (quirks & EDID_QUIRK_FORCE_REDUCED_BLANKING) {
+ mode = drm_cvt_mode(dev, hactive, vactive, 60, true, false, false);
+ if (!mode)
+ return NULL;
+
+ goto set_size;
+ }
+
mode = drm_mode_create(dev);
if (!mode)
return NULL;
- mode->type = DRM_MODE_TYPE_DRIVER;
-
if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH)
timing->pixel_clock = cpu_to_le16(1088);
@@ -914,8 +926,6 @@ static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev,
drm_mode_do_interlace_quirk(mode, pt);
- drm_mode_set_name(mode);
-
if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) {
pt->misc |= DRM_EDID_PT_HSYNC_POSITIVE | DRM_EDID_PT_VSYNC_POSITIVE;
}
@@ -925,6 +935,7 @@ static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev,
mode->flags |= (pt->misc & DRM_EDID_PT_VSYNC_POSITIVE) ?
DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC;
+set_size:
mode->width_mm = pt->width_mm_lo | (pt->width_height_mm_hi & 0xf0) << 4;
mode->height_mm = pt->height_mm_lo | (pt->width_height_mm_hi & 0xf) << 8;
@@ -938,6 +949,9 @@ static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev,
mode->height_mm = edid->height_cm * 10;
}
+ mode->type = DRM_MODE_TYPE_DRIVER;
+ drm_mode_set_name(mode);
+
return mode;
}
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index eb2b3c25b9e..5363e9c66c2 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2032,6 +2032,8 @@ void i915_debugfs_cleanup(struct drm_minor *minor)
1, minor);
drm_debugfs_remove_files((struct drm_info_list *) &i915_ring_stop_fops,
1, minor);
+ drm_debugfs_remove_files((struct drm_info_list *) &i915_error_state_fops,
+ 1, minor);
}
#endif /* CONFIG_DEBUG_FS */
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index c1e5c66553d..288d7b8f49a 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2063,10 +2063,8 @@ i915_gem_object_unbind(struct drm_i915_gem_object *obj)
if (obj->gtt_space == NULL)
return 0;
- if (obj->pin_count != 0) {
- DRM_ERROR("Attempting to unbind pinned buffer\n");
- return -EINVAL;
- }
+ if (obj->pin_count)
+ return -EBUSY;
ret = i915_gem_object_finish_gpu(obj);
if (ret)
@@ -3293,6 +3291,7 @@ struct drm_i915_gem_object *i915_gem_alloc_object(struct drm_device *dev,
struct drm_i915_private *dev_priv = dev->dev_private;
struct drm_i915_gem_object *obj;
struct address_space *mapping;
+ u32 mask;
obj = kzalloc(sizeof(*obj), GFP_KERNEL);
if (obj == NULL)
@@ -3303,8 +3302,15 @@ struct drm_i915_gem_object *i915_gem_alloc_object(struct drm_device *dev,
return NULL;
}
+ mask = GFP_HIGHUSER | __GFP_RECLAIMABLE;
+ if (IS_CRESTLINE(dev) || IS_BROADWATER(dev)) {
+ /* 965gm cannot relocate objects above 4GiB. */
+ mask &= ~__GFP_HIGHMEM;
+ mask |= __GFP_DMA32;
+ }
+
mapping = obj->base.filp->f_path.dentry->d_inode->i_mapping;
- mapping_set_gfp_mask(mapping, GFP_HIGHUSER | __GFP_RECLAIMABLE);
+ mapping_set_gfp_mask(mapping, mask);
i915_gem_info_add_obj(dev_priv, size);
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index cc4a6330761..1417660a93e 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -350,8 +350,8 @@ static void gen6_pm_rps_work(struct work_struct *work)
{
drm_i915_private_t *dev_priv = container_of(work, drm_i915_private_t,
rps_work);
- u8 new_delay = dev_priv->cur_delay;
u32 pm_iir, pm_imr;
+ u8 new_delay;
spin_lock_irq(&dev_priv->rps_lock);
pm_iir = dev_priv->pm_iir;
@@ -360,41 +360,18 @@ static void gen6_pm_rps_work(struct work_struct *work)
I915_WRITE(GEN6_PMIMR, 0);
spin_unlock_irq(&dev_priv->rps_lock);
- if (!pm_iir)
+ if ((pm_iir & GEN6_PM_DEFERRED_EVENTS) == 0)
return;
mutex_lock(&dev_priv->dev->struct_mutex);
- if (pm_iir & GEN6_PM_RP_UP_THRESHOLD) {
- if (dev_priv->cur_delay != dev_priv->max_delay)
- new_delay = dev_priv->cur_delay + 1;
- if (new_delay > dev_priv->max_delay)
- new_delay = dev_priv->max_delay;
- } else if (pm_iir & (GEN6_PM_RP_DOWN_THRESHOLD | GEN6_PM_RP_DOWN_TIMEOUT)) {
- gen6_gt_force_wake_get(dev_priv);
- if (dev_priv->cur_delay != dev_priv->min_delay)
- new_delay = dev_priv->cur_delay - 1;
- if (new_delay < dev_priv->min_delay) {
- new_delay = dev_priv->min_delay;
- I915_WRITE(GEN6_RP_INTERRUPT_LIMITS,
- I915_READ(GEN6_RP_INTERRUPT_LIMITS) |
- ((new_delay << 16) & 0x3f0000));
- } else {
- /* Make sure we continue to get down interrupts
- * until we hit the minimum frequency */
- I915_WRITE(GEN6_RP_INTERRUPT_LIMITS,
- I915_READ(GEN6_RP_INTERRUPT_LIMITS) & ~0x3f0000);
- }
- gen6_gt_force_wake_put(dev_priv);
- }
+
+ if (pm_iir & GEN6_PM_RP_UP_THRESHOLD)
+ new_delay = dev_priv->cur_delay + 1;
+ else
+ new_delay = dev_priv->cur_delay - 1;
gen6_set_rps(dev_priv->dev, new_delay);
- dev_priv->cur_delay = new_delay;
- /*
- * rps_lock not held here because clearing is non-destructive. There is
- * an *extremely* unlikely race with gen6_rps_enable() that is prevented
- * by holding struct_mutex for the duration of the write.
- */
mutex_unlock(&dev_priv->dev->struct_mutex);
}
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index ee61ad1e642..91478942090 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -910,9 +910,10 @@ static void assert_pll(struct drm_i915_private *dev_priv,
/* For ILK+ */
static void assert_pch_pll(struct drm_i915_private *dev_priv,
- struct intel_crtc *intel_crtc, bool state)
+ struct intel_pch_pll *pll,
+ struct intel_crtc *crtc,
+ bool state)
{
- int reg;
u32 val;
bool cur_state;
@@ -921,30 +922,37 @@ static void assert_pch_pll(struct drm_i915_private *dev_priv,
return;
}
- if (!intel_crtc->pch_pll) {
- WARN(1, "asserting PCH PLL enabled with no PLL\n");
+ if (WARN (!pll,
+ "asserting PCH PLL %s with no PLL\n", state_string(state)))
return;
- }
- if (HAS_PCH_CPT(dev_priv->dev)) {
+ val = I915_READ(pll->pll_reg);
+ cur_state = !!(val & DPLL_VCO_ENABLE);
+ WARN(cur_state != state,
+ "PCH PLL state for reg %x assertion failure (expected %s, current %s), val=%08x\n",
+ pll->pll_reg, state_string(state), state_string(cur_state), val);
+
+ /* Make sure the selected PLL is correctly attached to the transcoder */
+ if (crtc && HAS_PCH_CPT(dev_priv->dev)) {
u32 pch_dpll;
pch_dpll = I915_READ(PCH_DPLL_SEL);
-
- /* Make sure the selected PLL is enabled to the transcoder */
- WARN(!((pch_dpll >> (4 * intel_crtc->pipe)) & 8),
- "transcoder %d PLL not enabled\n", intel_crtc->pipe);
+ cur_state = pll->pll_reg == _PCH_DPLL_B;
+ if (!WARN(((pch_dpll >> (4 * crtc->pipe)) & 1) != cur_state,
+ "PLL[%d] not attached to this transcoder %d: %08x\n",
+ cur_state, crtc->pipe, pch_dpll)) {
+ cur_state = !!(val >> (4*crtc->pipe + 3));
+ WARN(cur_state != state,
+ "PLL[%d] not %s on this transcoder %d: %08x\n",
+ pll->pll_reg == _PCH_DPLL_B,
+ state_string(state),
+ crtc->pipe,
+ val);
+ }
}
-
- reg = intel_crtc->pch_pll->pll_reg;
- val = I915_READ(reg);
- cur_state = !!(val & DPLL_VCO_ENABLE);
- WARN(cur_state != state,
- "PCH PLL state assertion failure (expected %s, current %s)\n",
- state_string(state), state_string(cur_state));
}
-#define assert_pch_pll_enabled(d, p) assert_pch_pll(d, p, true)
-#define assert_pch_pll_disabled(d, p) assert_pch_pll(d, p, false)
+#define assert_pch_pll_enabled(d, p, c) assert_pch_pll(d, p, c, true)
+#define assert_pch_pll_disabled(d, p, c) assert_pch_pll(d, p, c, false)
static void assert_fdi_tx(struct drm_i915_private *dev_priv,
enum pipe pipe, bool state)
@@ -1424,7 +1432,7 @@ static void intel_enable_pch_pll(struct intel_crtc *intel_crtc)
assert_pch_refclk_enabled(dev_priv);
if (pll->active++ && pll->on) {
- assert_pch_pll_enabled(dev_priv, intel_crtc);
+ assert_pch_pll_enabled(dev_priv, pll, NULL);
return;
}
@@ -1460,12 +1468,12 @@ static void intel_disable_pch_pll(struct intel_crtc *intel_crtc)
intel_crtc->base.base.id);
if (WARN_ON(pll->active == 0)) {
- assert_pch_pll_disabled(dev_priv, intel_crtc);
+ assert_pch_pll_disabled(dev_priv, pll, NULL);
return;
}
if (--pll->active) {
- assert_pch_pll_enabled(dev_priv, intel_crtc);
+ assert_pch_pll_enabled(dev_priv, pll, NULL);
return;
}
@@ -1495,7 +1503,9 @@ static void intel_enable_transcoder(struct drm_i915_private *dev_priv,
BUG_ON(dev_priv->info->gen < 5);
/* Make sure PCH DPLL is enabled */
- assert_pch_pll_enabled(dev_priv, to_intel_crtc(crtc));
+ assert_pch_pll_enabled(dev_priv,
+ to_intel_crtc(crtc)->pch_pll,
+ to_intel_crtc(crtc));
/* FDI must be feeding us bits for PCH ports */
assert_fdi_tx_enabled(dev_priv, pipe);
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 71c7096e386..296cfc201a8 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -266,6 +266,9 @@ intel_dp_mode_valid(struct drm_connector *connector,
if (mode->clock < 10000)
return MODE_CLOCK_LOW;
+ if (mode->flags & DRM_MODE_FLAG_DBLCLK)
+ return MODE_H_ILLEGAL;
+
return MODE_OK;
}
@@ -702,6 +705,9 @@ intel_dp_mode_fixup(struct drm_encoder *encoder, struct drm_display_mode *mode,
mode->clock = intel_dp->panel_fixed_mode->clock;
}
+ if (mode->flags & DRM_MODE_FLAG_DBLCLK)
+ return false;
+
DRM_DEBUG_KMS("DP link computation with max lane count %i "
"max bw %02x pixel clock %iKHz\n",
max_lane_count, bws[max_clock], mode->clock);
@@ -1154,11 +1160,10 @@ static void ironlake_edp_panel_off(struct intel_dp *intel_dp)
DRM_DEBUG_KMS("Turn eDP power off\n");
- WARN(intel_dp->want_panel_vdd, "Cannot turn power off while VDD is on\n");
- ironlake_panel_vdd_off_sync(intel_dp); /* finish any pending work */
+ WARN(!intel_dp->want_panel_vdd, "Need VDD to turn off panel\n");
pp = ironlake_get_pp_control(dev_priv);
- pp &= ~(POWER_TARGET_ON | EDP_FORCE_VDD | PANEL_POWER_RESET | EDP_BLC_ENABLE);
+ pp &= ~(POWER_TARGET_ON | PANEL_POWER_RESET | EDP_BLC_ENABLE);
I915_WRITE(PCH_PP_CONTROL, pp);
POSTING_READ(PCH_PP_CONTROL);
@@ -1266,18 +1271,16 @@ static void intel_dp_prepare(struct drm_encoder *encoder)
{
struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
+
+ /* Make sure the panel is off before trying to change the mode. But also
+ * ensure that we have vdd while we switch off the panel. */
+ ironlake_edp_panel_vdd_on(intel_dp);
ironlake_edp_backlight_off(intel_dp);
ironlake_edp_panel_off(intel_dp);
- /* Wake up the sink first */
- ironlake_edp_panel_vdd_on(intel_dp);
intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
intel_dp_link_down(intel_dp);
ironlake_edp_panel_vdd_off(intel_dp, false);
-
- /* Make sure the panel is off before trying to
- * change the mode
- */
}
static void intel_dp_commit(struct drm_encoder *encoder)
@@ -1309,10 +1312,11 @@ intel_dp_dpms(struct drm_encoder *encoder, int mode)
uint32_t dp_reg = I915_READ(intel_dp->output_reg);
if (mode != DRM_MODE_DPMS_ON) {
+ /* Switching the panel off requires vdd. */
+ ironlake_edp_panel_vdd_on(intel_dp);
ironlake_edp_backlight_off(intel_dp);
ironlake_edp_panel_off(intel_dp);
- ironlake_edp_panel_vdd_on(intel_dp);
intel_dp_sink_dpms(intel_dp, mode);
intel_dp_link_down(intel_dp);
ironlake_edp_panel_vdd_off(intel_dp, false);
diff --git a/drivers/gpu/drm/i915/intel_i2c.c b/drivers/gpu/drm/i915/intel_i2c.c
index 4a9707dd0f9..1991a4408cf 100644
--- a/drivers/gpu/drm/i915/intel_i2c.c
+++ b/drivers/gpu/drm/i915/intel_i2c.c
@@ -396,11 +396,22 @@ clear_err:
* Wait for bus to IDLE before clearing NAK.
* If we clear the NAK while bus is still active, then it will stay
* active and the next transaction may fail.
+ *
+ * If no ACK is received during the address phase of a transaction, the
+ * adapter must report -ENXIO. It is not clear what to return if no ACK
+ * is received at other times. But we have to be careful to not return
+ * spurious -ENXIO because that will prevent i2c and drm edid functions
+ * from retrying. So return -ENXIO only when gmbus properly quiescents -
+ * timing out seems to happen when there _is_ a ddc chip present, but
+ * it's slow responding and only answers on the 2nd retry.
*/
+ ret = -ENXIO;
if (wait_for((I915_READ(GMBUS2 + reg_offset) & GMBUS_ACTIVE) == 0,
- 10))
+ 10)) {
DRM_DEBUG_KMS("GMBUS [%s] timed out after NAK\n",
adapter->name);
+ ret = -ETIMEDOUT;
+ }
/* Toggle the Software Clear Interrupt bit. This has the effect
* of resetting the GMBUS controller and so clearing the
@@ -414,14 +425,6 @@ clear_err:
adapter->name, msgs[i].addr,
(msgs[i].flags & I2C_M_RD) ? 'r' : 'w', msgs[i].len);
- /*
- * If no ACK is received during the address phase of a transaction,
- * the adapter must report -ENXIO.
- * It is not clear what to return if no ACK is received at other times.
- * So, we always return -ENXIO in all NAK cases, to ensure we send
- * it at least during the one case that is specified.
- */
- ret = -ENXIO;
goto out;
timeout:
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index 9dee82350de..08eb04c787e 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -747,6 +747,14 @@ static const struct dmi_system_id intel_no_lvds[] = {
},
{
.callback = intel_no_lvds_dmi_callback,
+ .ident = "Hewlett-Packard HP t5740e Thin Client",
+ .matches = {
+ DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "HP t5740e Thin Client"),
+ },
+ },
+ {
+ .callback = intel_no_lvds_dmi_callback,
.ident = "Hewlett-Packard t5745",
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 8e79ff67ec9..d0ce2a5b1d3 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -2270,10 +2270,33 @@ void ironlake_disable_drps(struct drm_device *dev)
void gen6_set_rps(struct drm_device *dev, u8 val)
{
struct drm_i915_private *dev_priv = dev->dev_private;
- u32 swreq;
+ u32 limits;
- swreq = (val & 0x3ff) << 25;
- I915_WRITE(GEN6_RPNSWREQ, swreq);
+ limits = 0;
+ if (val >= dev_priv->max_delay)
+ val = dev_priv->max_delay;
+ else
+ limits |= dev_priv->max_delay << 24;
+
+ if (val <= dev_priv->min_delay)
+ val = dev_priv->min_delay;
+ else
+ limits |= dev_priv->min_delay << 16;
+
+ if (val == dev_priv->cur_delay)
+ return;
+
+ I915_WRITE(GEN6_RPNSWREQ,
+ GEN6_FREQUENCY(val) |
+ GEN6_OFFSET(0) |
+ GEN6_AGGRESSIVE_TURBO);
+
+ /* Make sure we continue to get interrupts
+ * until we hit the minimum or maximum frequencies.
+ */
+ I915_WRITE(GEN6_RP_INTERRUPT_LIMITS, limits);
+
+ dev_priv->cur_delay = val;
}
void gen6_disable_rps(struct drm_device *dev)
@@ -2327,11 +2350,10 @@ int intel_enable_rc6(const struct drm_device *dev)
void gen6_enable_rps(struct drm_i915_private *dev_priv)
{
struct intel_ring_buffer *ring;
- u32 rp_state_cap = I915_READ(GEN6_RP_STATE_CAP);
- u32 gt_perf_status = I915_READ(GEN6_GT_PERF_STATUS);
+ u32 rp_state_cap;
+ u32 gt_perf_status;
u32 pcu_mbox, rc6_mask = 0;
u32 gtfifodbg;
- int cur_freq, min_freq, max_freq;
int rc6_mode;
int i;
@@ -2352,6 +2374,14 @@ void gen6_enable_rps(struct drm_i915_private *dev_priv)
gen6_gt_force_wake_get(dev_priv);
+ rp_state_cap = I915_READ(GEN6_RP_STATE_CAP);
+ gt_perf_status = I915_READ(GEN6_GT_PERF_STATUS);
+
+ /* In units of 100MHz */
+ dev_priv->max_delay = rp_state_cap & 0xff;
+ dev_priv->min_delay = (rp_state_cap & 0xff0000) >> 16;
+ dev_priv->cur_delay = 0;
+
/* disable the counters and set deterministic thresholds */
I915_WRITE(GEN6_RC_CONTROL, 0);
@@ -2399,8 +2429,8 @@ void gen6_enable_rps(struct drm_i915_private *dev_priv)
I915_WRITE(GEN6_RP_DOWN_TIMEOUT, 1000000);
I915_WRITE(GEN6_RP_INTERRUPT_LIMITS,
- 18 << 24 |
- 6 << 16);
+ dev_priv->max_delay << 24 |
+ dev_priv->min_delay << 16);
I915_WRITE(GEN6_RP_UP_THRESHOLD, 10000);
I915_WRITE(GEN6_RP_DOWN_THRESHOLD, 1000000);
I915_WRITE(GEN6_RP_UP_EI, 100000);
@@ -2408,7 +2438,7 @@ void gen6_enable_rps(struct drm_i915_private *dev_priv)
I915_WRITE(GEN6_RP_IDLE_HYSTERSIS, 10);
I915_WRITE(GEN6_RP_CONTROL,
GEN6_RP_MEDIA_TURBO |
- GEN6_RP_MEDIA_HW_MODE |
+ GEN6_RP_MEDIA_HW_NORMAL_MODE |
GEN6_RP_MEDIA_IS_GFX |
GEN6_RP_ENABLE |
GEN6_RP_UP_BUSY_AVG |
@@ -2426,10 +2456,6 @@ void gen6_enable_rps(struct drm_i915_private *dev_priv)
500))
DRM_ERROR("timeout waiting for pcode mailbox to finish\n");
- min_freq = (rp_state_cap & 0xff0000) >> 16;
- max_freq = rp_state_cap & 0xff;
- cur_freq = (gt_perf_status & 0xff00) >> 8;
-
/* Check for overclock support */
if (wait_for((I915_READ(GEN6_PCODE_MAILBOX) & GEN6_PCODE_READY) == 0,
500))
@@ -2440,14 +2466,11 @@ void gen6_enable_rps(struct drm_i915_private *dev_priv)
500))
DRM_ERROR("timeout waiting for pcode mailbox to finish\n");
if (pcu_mbox & (1<<31)) { /* OC supported */
- max_freq = pcu_mbox & 0xff;
+ dev_priv->max_delay = pcu_mbox & 0xff;
DRM_DEBUG_DRIVER("overclocking supported, adjusting frequency max to %dMHz\n", pcu_mbox * 50);
}
- /* In units of 100MHz */
- dev_priv->max_delay = max_freq;
- dev_priv->min_delay = min_freq;
- dev_priv->cur_delay = cur_freq;
+ gen6_set_rps(dev_priv->dev, (gt_perf_status & 0xff00) >> 8);
/* requires MSI enabled */
I915_WRITE(GEN6_PMIER,
@@ -3580,8 +3603,9 @@ static void gen6_sanitize_pm(struct drm_device *dev)
limits |= (dev_priv->min_delay & 0x3f) << 16;
if (old != limits) {
- DRM_ERROR("Power management discrepancy: GEN6_RP_INTERRUPT_LIMITS expected %08x, was %08x\n",
- limits, old);
+ /* Note that the known failure case is to read back 0. */
+ DRM_DEBUG_DRIVER("Power management discrepancy: GEN6_RP_INTERRUPT_LIMITS "
+ "expected %08x, was %08x\n", limits, old);
I915_WRITE(GEN6_RP_INTERRUPT_LIMITS, limits);
}
diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c
index a949b73880c..b6a9d45fc3c 100644
--- a/drivers/gpu/drm/i915/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/intel_sdvo.c
@@ -783,10 +783,12 @@ static void intel_sdvo_get_dtd_from_mode(struct intel_sdvo_dtd *dtd,
((v_sync_len & 0x30) >> 4);
dtd->part2.dtd_flags = 0x18;
+ if (mode->flags & DRM_MODE_FLAG_INTERLACE)
+ dtd->part2.dtd_flags |= DTD_FLAG_INTERLACE;
if (mode->flags & DRM_MODE_FLAG_PHSYNC)
- dtd->part2.dtd_flags |= 0x2;
+ dtd->part2.dtd_flags |= DTD_FLAG_HSYNC_POSITIVE;
if (mode->flags & DRM_MODE_FLAG_PVSYNC)
- dtd->part2.dtd_flags |= 0x4;
+ dtd->part2.dtd_flags |= DTD_FLAG_VSYNC_POSITIVE;
dtd->part2.sdvo_flags = 0;
dtd->part2.v_sync_off_high = v_sync_offset & 0xc0;
@@ -820,9 +822,11 @@ static void intel_sdvo_get_mode_from_dtd(struct drm_display_mode * mode,
mode->clock = dtd->part1.clock * 10;
mode->flags &= ~(DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
- if (dtd->part2.dtd_flags & 0x2)
+ if (dtd->part2.dtd_flags & DTD_FLAG_INTERLACE)
+ mode->flags |= DRM_MODE_FLAG_INTERLACE;
+ if (dtd->part2.dtd_flags & DTD_FLAG_HSYNC_POSITIVE)
mode->flags |= DRM_MODE_FLAG_PHSYNC;
- if (dtd->part2.dtd_flags & 0x4)
+ if (dtd->part2.dtd_flags & DTD_FLAG_VSYNC_POSITIVE)
mode->flags |= DRM_MODE_FLAG_PVSYNC;
}
diff --git a/drivers/gpu/drm/i915/intel_sdvo_regs.h b/drivers/gpu/drm/i915/intel_sdvo_regs.h
index 6b7b22f4d63..9d030142ee4 100644
--- a/drivers/gpu/drm/i915/intel_sdvo_regs.h
+++ b/drivers/gpu/drm/i915/intel_sdvo_regs.h
@@ -61,6 +61,11 @@ struct intel_sdvo_caps {
u16 output_flags;
} __attribute__((packed));
+/* Note: SDVO detailed timing flags match EDID misc flags. */
+#define DTD_FLAG_HSYNC_POSITIVE (1 << 1)
+#define DTD_FLAG_VSYNC_POSITIVE (1 << 2)
+#define DTD_FLAG_INTERLACE (1 << 7)
+
/** This matches the EDID DTD structure, more or less */
struct intel_sdvo_dtd {
struct {
diff --git a/drivers/gpu/drm/i915/intel_tv.c b/drivers/gpu/drm/i915/intel_tv.c
index 3346612d295..a233a51fd7e 100644
--- a/drivers/gpu/drm/i915/intel_tv.c
+++ b/drivers/gpu/drm/i915/intel_tv.c
@@ -674,6 +674,54 @@ static const struct tv_mode tv_modes[] = {
.filter_table = filter_table,
},
{
+ .name = "480p",
+ .clock = 107520,
+ .refresh = 59940,
+ .oversample = TV_OVERSAMPLE_4X,
+ .component_only = 1,
+
+ .hsync_end = 64, .hblank_end = 122,
+ .hblank_start = 842, .htotal = 857,
+
+ .progressive = true, .trilevel_sync = false,
+
+ .vsync_start_f1 = 12, .vsync_start_f2 = 12,
+ .vsync_len = 12,
+
+ .veq_ena = false,
+
+ .vi_end_f1 = 44, .vi_end_f2 = 44,
+ .nbr_end = 479,
+
+ .burst_ena = false,
+
+ .filter_table = filter_table,
+ },
+ {
+ .name = "576p",
+ .clock = 107520,
+ .refresh = 50000,
+ .oversample = TV_OVERSAMPLE_4X,
+ .component_only = 1,
+
+ .hsync_end = 64, .hblank_end = 139,
+ .hblank_start = 859, .htotal = 863,
+
+ .progressive = true, .trilevel_sync = false,
+
+ .vsync_start_f1 = 10, .vsync_start_f2 = 10,
+ .vsync_len = 10,
+
+ .veq_ena = false,
+
+ .vi_end_f1 = 48, .vi_end_f2 = 48,
+ .nbr_end = 575,
+
+ .burst_ena = false,
+
+ .filter_table = filter_table,
+ },
+ {
.name = "720p@60Hz",
.clock = 148800,
.refresh = 60000,
@@ -1194,6 +1242,11 @@ intel_tv_detect_type(struct intel_tv *intel_tv,
I915_WRITE(TV_DAC, save_tv_dac & ~TVDAC_STATE_CHG_EN);
I915_WRITE(TV_CTL, save_tv_ctl);
+ POSTING_READ(TV_CTL);
+
+ /* For unknown reasons the hw barfs if we don't do this vblank wait. */
+ intel_wait_for_vblank(intel_tv->base.base.dev,
+ to_intel_crtc(intel_tv->base.base.crtc)->pipe);
/* Restore interrupt config */
if (connector->polled & DRM_CONNECTOR_POLL_HPD) {
diff --git a/drivers/gpu/drm/radeon/ni.c b/drivers/gpu/drm/radeon/ni.c
index b01c2dd627b..ce4e7cc6c90 100644
--- a/drivers/gpu/drm/radeon/ni.c
+++ b/drivers/gpu/drm/radeon/ni.c
@@ -865,7 +865,7 @@ static void cayman_gpu_init(struct radeon_device *rdev)
/* num banks is 8 on all fusion asics. 0 = 4, 1 = 8, 2 = 16 */
if (rdev->flags & RADEON_IS_IGP)
- rdev->config.evergreen.tile_config |= 1 << 4;
+ rdev->config.cayman.tile_config |= 1 << 4;
else
rdev->config.cayman.tile_config |=
((mc_arb_ramcfg & NOOFBANK_MASK) >> NOOFBANK_SHIFT) << 4;
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 1dc3a4aba02..492654f8ee7 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -848,7 +848,6 @@ struct radeon_cs_parser {
s32 priority;
};
-extern int radeon_cs_update_pages(struct radeon_cs_parser *p, int pg_idx);
extern int radeon_cs_finish_pages(struct radeon_cs_parser *p);
extern u32 radeon_get_ib_value(struct radeon_cs_parser *p, int idx);
diff --git a/drivers/gpu/drm/radeon/radeon_atombios.c b/drivers/gpu/drm/radeon/radeon_atombios.c
index f6e69b8c06c..b1e3820df36 100644
--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -444,7 +444,9 @@ static bool radeon_atom_apply_quirks(struct drm_device *dev,
*/
if ((dev->pdev->device == 0x9498) &&
(dev->pdev->subsystem_vendor == 0x1682) &&
- (dev->pdev->subsystem_device == 0x2452)) {
+ (dev->pdev->subsystem_device == 0x2452) &&
+ (i2c_bus->valid == false) &&
+ !(supported_device & (ATOM_DEVICE_TV_SUPPORT | ATOM_DEVICE_CV_SUPPORT))) {
struct radeon_device *rdev = dev->dev_private;
*i2c_bus = radeon_lookup_i2c_gpio(rdev, 0x93);
}
diff --git a/drivers/gpu/drm/radeon/radeon_cs.c b/drivers/gpu/drm/radeon/radeon_cs.c
index c7d64a73903..0137689ed46 100644
--- a/drivers/gpu/drm/radeon/radeon_cs.c
+++ b/drivers/gpu/drm/radeon/radeon_cs.c
@@ -580,7 +580,7 @@ int radeon_cs_finish_pages(struct radeon_cs_parser *p)
return 0;
}
-int radeon_cs_update_pages(struct radeon_cs_parser *p, int pg_idx)
+static int radeon_cs_update_pages(struct radeon_cs_parser *p, int pg_idx)
{
int new_page;
struct radeon_cs_chunk *ibc = &p->chunks[p->chunk_ib_idx];
@@ -623,3 +623,28 @@ int radeon_cs_update_pages(struct radeon_cs_parser *p, int pg_idx)
return new_page;
}
+
+u32 radeon_get_ib_value(struct radeon_cs_parser *p, int idx)
+{
+ struct radeon_cs_chunk *ibc = &p->chunks[p->chunk_ib_idx];
+ u32 pg_idx, pg_offset;
+ u32 idx_value = 0;
+ int new_page;
+
+ pg_idx = (idx * 4) / PAGE_SIZE;
+ pg_offset = (idx * 4) % PAGE_SIZE;
+
+ if (ibc->kpage_idx[0] == pg_idx)
+ return ibc->kpage[0][pg_offset/4];
+ if (ibc->kpage_idx[1] == pg_idx)
+ return ibc->kpage[1][pg_offset/4];
+
+ new_page = radeon_cs_update_pages(p, pg_idx);
+ if (new_page < 0) {
+ p->parser_error = new_page;
+ return 0;
+ }
+
+ idx_value = ibc->kpage[new_page][pg_offset/4];
+ return idx_value;
+}
diff --git a/drivers/gpu/drm/radeon/radeon_ring.c b/drivers/gpu/drm/radeon/radeon_ring.c
index 493a7be7530..983658c9135 100644
--- a/drivers/gpu/drm/radeon/radeon_ring.c
+++ b/drivers/gpu/drm/radeon/radeon_ring.c
@@ -39,31 +39,6 @@
*/
int radeon_debugfs_sa_init(struct radeon_device *rdev);
-u32 radeon_get_ib_value(struct radeon_cs_parser *p, int idx)
-{
- struct radeon_cs_chunk *ibc = &p->chunks[p->chunk_ib_idx];
- u32 pg_idx, pg_offset;
- u32 idx_value = 0;
- int new_page;
-
- pg_idx = (idx * 4) / PAGE_SIZE;
- pg_offset = (idx * 4) % PAGE_SIZE;
-
- if (ibc->kpage_idx[0] == pg_idx)
- return ibc->kpage[0][pg_offset/4];
- if (ibc->kpage_idx[1] == pg_idx)
- return ibc->kpage[1][pg_offset/4];
-
- new_page = radeon_cs_update_pages(p, pg_idx);
- if (new_page < 0) {
- p->parser_error = new_page;
- return 0;
- }
-
- idx_value = ibc->kpage[new_page][pg_offset/4];
- return idx_value;
-}
-
int radeon_ib_get(struct radeon_device *rdev, int ring,
struct radeon_ib *ib, unsigned size)
{
diff --git a/drivers/gpu/drm/udl/udl_gem.c b/drivers/gpu/drm/udl/udl_gem.c
index 40efd32f7dc..97acc9c6c95 100644
--- a/drivers/gpu/drm/udl/udl_gem.c
+++ b/drivers/gpu/drm/udl/udl_gem.c
@@ -234,7 +234,7 @@ int udl_gem_mmap(struct drm_file *file, struct drm_device *dev,
ret = udl_gem_get_pages(gobj, GFP_KERNEL);
if (ret)
- return ret;
+ goto out;
if (!gobj->base.map_list.map) {
ret = drm_gem_create_mmap_offset(obj);
if (ret)
@@ -257,8 +257,6 @@ static int udl_prime_create(struct drm_device *dev,
{
struct udl_gem_object *obj;
int npages;
- int i;
- struct scatterlist *iter;
npages = size / PAGE_SIZE;
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index a5bee8e2dfc..d90a421e9ca 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -450,12 +450,27 @@ static void dump_command(unsigned long phys_addr)
static void iommu_print_event(struct amd_iommu *iommu, void *__evt)
{
- u32 *event = __evt;
- int type = (event[1] >> EVENT_TYPE_SHIFT) & EVENT_TYPE_MASK;
- int devid = (event[0] >> EVENT_DEVID_SHIFT) & EVENT_DEVID_MASK;
- int domid = (event[1] >> EVENT_DOMID_SHIFT) & EVENT_DOMID_MASK;
- int flags = (event[1] >> EVENT_FLAGS_SHIFT) & EVENT_FLAGS_MASK;
- u64 address = (u64)(((u64)event[3]) << 32) | event[2];
+ int type, devid, domid, flags;
+ volatile u32 *event = __evt;
+ int count = 0;
+ u64 address;
+
+retry:
+ type = (event[1] >> EVENT_TYPE_SHIFT) & EVENT_TYPE_MASK;
+ devid = (event[0] >> EVENT_DEVID_SHIFT) & EVENT_DEVID_MASK;
+ domid = (event[1] >> EVENT_DOMID_SHIFT) & EVENT_DOMID_MASK;
+ flags = (event[1] >> EVENT_FLAGS_SHIFT) & EVENT_FLAGS_MASK;
+ address = (u64)(((u64)event[3]) << 32) | event[2];
+
+ if (type == 0) {
+ /* Did we hit the erratum? */
+ if (++count == LOOP_TIMEOUT) {
+ pr_err("AMD-Vi: No event written to event log\n");
+ return;
+ }
+ udelay(1);
+ goto retry;
+ }
printk(KERN_ERR "AMD-Vi: Event logged [");
@@ -508,6 +523,8 @@ static void iommu_print_event(struct amd_iommu *iommu, void *__evt)
default:
printk(KERN_ERR "UNKNOWN type=0x%02x]\n", type);
}
+
+ memset(__evt, 0, 4 * sizeof(u32));
}
static void iommu_poll_events(struct amd_iommu *iommu)
@@ -2035,20 +2052,20 @@ out_err:
}
/* FIXME: Move this to PCI code */
-#define PCI_PRI_TLP_OFF (1 << 2)
+#define PCI_PRI_TLP_OFF (1 << 15)
bool pci_pri_tlp_required(struct pci_dev *pdev)
{
- u16 control;
+ u16 status;
int pos;
pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI);
if (!pos)
return false;
- pci_read_config_word(pdev, pos + PCI_PRI_CTRL, &control);
+ pci_read_config_word(pdev, pos + PCI_PRI_STATUS, &status);
- return (control & PCI_PRI_TLP_OFF) ? true : false;
+ return (status & PCI_PRI_TLP_OFF) ? true : false;
}
/*
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 2198b2dbbcd..8b9ded88e6f 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -119,6 +119,7 @@ EXPORT_SYMBOL_GPL(iommu_present);
* iommu_set_fault_handler() - set a fault handler for an iommu domain
* @domain: iommu domain
* @handler: fault handler
+ * @token: user data, will be passed back to the fault handler
*
* This function should be used by IOMMU users which want to be notified
* whenever an IOMMU fault happens.
@@ -127,11 +128,13 @@ EXPORT_SYMBOL_GPL(iommu_present);
* error code otherwise.
*/
void iommu_set_fault_handler(struct iommu_domain *domain,
- iommu_fault_handler_t handler)
+ iommu_fault_handler_t handler,
+ void *token)
{
BUG_ON(!domain);
domain->handler = handler;
+ domain->handler_token = token;
}
EXPORT_SYMBOL_GPL(iommu_set_fault_handler);
diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c
index 6899dcd02df..e70ee2b59df 100644
--- a/drivers/iommu/omap-iommu.c
+++ b/drivers/iommu/omap-iommu.c
@@ -41,11 +41,13 @@
* @pgtable: the page table
* @iommu_dev: an omap iommu device attached to this domain. only a single
* iommu device can be attached for now.
+ * @dev: Device using this domain.
* @lock: domain lock, should be taken when attaching/detaching
*/
struct omap_iommu_domain {
u32 *pgtable;
struct omap_iommu *iommu_dev;
+ struct device *dev;
spinlock_t lock;
};
@@ -1081,6 +1083,7 @@ omap_iommu_attach_dev(struct iommu_domain *domain, struct device *dev)
}
omap_domain->iommu_dev = arch_data->iommu_dev = oiommu;
+ omap_domain->dev = dev;
oiommu->domain = domain;
out:
@@ -1088,19 +1091,16 @@ out:
return ret;
}
-static void omap_iommu_detach_dev(struct iommu_domain *domain,
- struct device *dev)
+static void _omap_iommu_detach_dev(struct omap_iommu_domain *omap_domain,
+ struct device *dev)
{
- struct omap_iommu_domain *omap_domain = domain->priv;
- struct omap_iommu_arch_data *arch_data = dev->archdata.iommu;
struct omap_iommu *oiommu = dev_to_omap_iommu(dev);
-
- spin_lock(&omap_domain->lock);
+ struct omap_iommu_arch_data *arch_data = dev->archdata.iommu;
/* only a single device is supported per domain for now */
if (omap_domain->iommu_dev != oiommu) {
dev_err(dev, "invalid iommu device\n");
- goto out;
+ return;
}
iopgtable_clear_entry_all(oiommu);
@@ -1108,8 +1108,16 @@ static void omap_iommu_detach_dev(struct iommu_domain *domain,
omap_iommu_detach(oiommu);
omap_domain->iommu_dev = arch_data->iommu_dev = NULL;
+ omap_domain->dev = NULL;
+}
-out:
+static void omap_iommu_detach_dev(struct iommu_domain *domain,
+ struct device *dev)
+{
+ struct omap_iommu_domain *omap_domain = domain->priv;
+
+ spin_lock(&omap_domain->lock);
+ _omap_iommu_detach_dev(omap_domain, dev);
spin_unlock(&omap_domain->lock);
}
@@ -1148,13 +1156,19 @@ out:
return -ENOMEM;
}
-/* assume device was already detached */
static void omap_iommu_domain_destroy(struct iommu_domain *domain)
{
struct omap_iommu_domain *omap_domain = domain->priv;
domain->priv = NULL;
+ /*
+ * An iommu device is still attached
+ * (currently, only one device can be attached) ?
+ */
+ if (omap_domain->iommu_dev)
+ _omap_iommu_detach_dev(omap_domain, omap_domain->dev);
+
kfree(omap_domain->pgtable);
kfree(omap_domain);
}
diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c
index 779306ee7b1..0c0a3779221 100644
--- a/drivers/iommu/tegra-gart.c
+++ b/drivers/iommu/tegra-gart.c
@@ -29,15 +29,17 @@
#include <linux/device.h>
#include <linux/io.h>
#include <linux/iommu.h>
+#include <linux/of.h>
#include <asm/cacheflush.h>
/* bitmap of the page sizes currently supported */
#define GART_IOMMU_PGSIZES (SZ_4K)
-#define GART_CONFIG 0x24
-#define GART_ENTRY_ADDR 0x28
-#define GART_ENTRY_DATA 0x2c
+#define GART_REG_BASE 0x24
+#define GART_CONFIG (0x24 - GART_REG_BASE)
+#define GART_ENTRY_ADDR (0x28 - GART_REG_BASE)
+#define GART_ENTRY_DATA (0x2c - GART_REG_BASE)
#define GART_ENTRY_PHYS_ADDR_VALID (1 << 31)
#define GART_PAGE_SHIFT 12
@@ -158,7 +160,7 @@ static int gart_iommu_attach_dev(struct iommu_domain *domain,
struct gart_client *client, *c;
int err = 0;
- gart = dev_get_drvdata(dev->parent);
+ gart = gart_handle;
if (!gart)
return -EINVAL;
domain->priv = gart;
@@ -422,6 +424,14 @@ const struct dev_pm_ops tegra_gart_pm_ops = {
.resume = tegra_gart_resume,
};
+#ifdef CONFIG_OF
+static struct of_device_id tegra_gart_of_match[] __devinitdata = {
+ { .compatible = "nvidia,tegra20-gart", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, tegra_gart_of_match);
+#endif
+
static struct platform_driver tegra_gart_driver = {
.probe = tegra_gart_probe,
.remove = tegra_gart_remove,
@@ -429,6 +439,7 @@ static struct platform_driver tegra_gart_driver = {
.owner = THIS_MODULE,
.name = "tegra-gart",
.pm = &tegra_gart_pm_ops,
+ .of_match_table = of_match_ptr(tegra_gart_of_match),
},
};
@@ -448,4 +459,5 @@ module_exit(tegra_gart_exit);
MODULE_DESCRIPTION("IOMMU API for GART in Tegra20");
MODULE_AUTHOR("Hiroshi DOYU <hdoyu@nvidia.com>");
+MODULE_ALIAS("platform:tegra-gart");
MODULE_LICENSE("GPL v2");
diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index eb93c821f59..ecd679043d7 100644
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -733,7 +733,7 @@ static int smmu_iommu_attach_dev(struct iommu_domain *domain,
pr_info("Reserve \"page zero\" for AVP vectors using a common dummy\n");
}
- dev_dbg(smmu->dev, "%s is attached\n", dev_name(c->dev));
+ dev_dbg(smmu->dev, "%s is attached\n", dev_name(dev));
return 0;
err_client:
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index d6f8adaa26e..8ea7bccc710 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -78,7 +78,7 @@ typedef int (*rproc_handle_resource_t)(struct rproc *rproc, void *, int avail);
* the recovery of the remote processor.
*/
static int rproc_iommu_fault(struct iommu_domain *domain, struct device *dev,
- unsigned long iova, int flags)
+ unsigned long iova, int flags, void *token)
{
dev_err(dev, "iommu fault: da 0x%lx flags 0x%x\n", iova, flags);
@@ -117,7 +117,7 @@ static int rproc_enable_iommu(struct rproc *rproc)
return -ENOMEM;
}
- iommu_set_fault_handler(domain, rproc_iommu_fault);
+ iommu_set_fault_handler(domain, rproc_iommu_fault, rproc);
ret = iommu_attach_device(domain, dev);
if (ret) {
diff --git a/fs/bio.c b/fs/bio.c
index 84da8853904..73922abba83 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -19,12 +19,14 @@
#include <linux/swap.h>
#include <linux/bio.h>
#include <linux/blkdev.h>
+#include <linux/iocontext.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/mempool.h>
#include <linux/workqueue.h>
+#include <linux/cgroup.h>
#include <scsi/sg.h> /* for struct sg_iovec */
#include <trace/events/block.h>
@@ -418,6 +420,7 @@ void bio_put(struct bio *bio)
* last put frees it
*/
if (atomic_dec_and_test(&bio->bi_cnt)) {
+ bio_disassociate_task(bio);
bio->bi_next = NULL;
bio->bi_destructor(bio);
}
@@ -1646,6 +1649,64 @@ bad:
}
EXPORT_SYMBOL(bioset_create);
+#ifdef CONFIG_BLK_CGROUP
+/**
+ * bio_associate_current - associate a bio with %current
+ * @bio: target bio
+ *
+ * Associate @bio with %current if it hasn't been associated yet. Block
+ * layer will treat @bio as if it were issued by %current no matter which
+ * task actually issues it.
+ *
+ * This function takes an extra reference of @task's io_context and blkcg
+ * which will be put when @bio is released. The caller must own @bio,
+ * ensure %current->io_context exists, and is responsible for synchronizing
+ * calls to this function.
+ */
+int bio_associate_current(struct bio *bio)
+{
+ struct io_context *ioc;
+ struct cgroup_subsys_state *css;
+
+ if (bio->bi_ioc)
+ return -EBUSY;
+
+ ioc = current->io_context;
+ if (!ioc)
+ return -ENOENT;
+
+ /* acquire active ref on @ioc and associate */
+ get_io_context_active(ioc);
+ bio->bi_ioc = ioc;
+
+ /* associate blkcg if exists */
+ rcu_read_lock();
+ css = task_subsys_state(current, blkio_subsys_id);
+ if (css && css_tryget(css))
+ bio->bi_css = css;
+ rcu_read_unlock();
+
+ return 0;
+}
+
+/**
+ * bio_disassociate_task - undo bio_associate_current()
+ * @bio: target bio
+ */
+void bio_disassociate_task(struct bio *bio)
+{
+ if (bio->bi_ioc) {
+ put_io_context(bio->bi_ioc);
+ bio->bi_ioc = NULL;
+ }
+ if (bio->bi_css) {
+ css_put(bio->bi_css);
+ bio->bi_css = NULL;
+ }
+}
+
+#endif /* CONFIG_BLK_CGROUP */
+
static void __init biovec_init_slabs(void)
{
int i;
diff --git a/fs/ioprio.c b/fs/ioprio.c
index 5e6dbe8958f..e50170ca7c3 100644
--- a/fs/ioprio.c
+++ b/fs/ioprio.c
@@ -50,7 +50,7 @@ int set_task_ioprio(struct task_struct *task, int ioprio)
ioc = get_task_io_context(task, GFP_ATOMIC, NUMA_NO_NODE);
if (ioc) {
- ioc_ioprio_changed(ioc, ioprio);
+ ioc->ioprio = ioprio;
put_io_context(ioc);
}
diff --git a/fs/splice.c b/fs/splice.c
index f8476841eb0..406ef2b792c 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -1388,7 +1388,7 @@ static long do_splice(struct file *in, loff_t __user *off_in,
*/
static int get_iovec_page_array(const struct iovec __user *iov,
unsigned int nr_vecs, struct page **pages,
- struct partial_page *partial, int aligned,
+ struct partial_page *partial, bool aligned,
unsigned int pipe_buffers)
{
int buffers = 0, error = 0;
@@ -1626,7 +1626,7 @@ static long vmsplice_to_pipe(struct file *file, const struct iovec __user *iov,
return -ENOMEM;
spd.nr_pages = get_iovec_page_array(iov, nr_segs, spd.pages,
- spd.partial, flags & SPLICE_F_GIFT,
+ spd.partial, false,
pipe->buffers);
if (spd.nr_pages <= 0)
ret = spd.nr_pages;
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 4d94eb8bcbc..26435890dc8 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -269,6 +269,14 @@ extern struct bio_vec *bvec_alloc_bs(gfp_t, int, unsigned long *, struct bio_set
extern void bvec_free_bs(struct bio_set *, struct bio_vec *, unsigned int);
extern unsigned int bvec_nr_vecs(unsigned short idx);
+#ifdef CONFIG_BLK_CGROUP
+int bio_associate_current(struct bio *bio);
+void bio_disassociate_task(struct bio *bio);
+#else /* CONFIG_BLK_CGROUP */
+static inline int bio_associate_current(struct bio *bio) { return -ENOENT; }
+static inline void bio_disassociate_task(struct bio *bio) { }
+#endif /* CONFIG_BLK_CGROUP */
+
/*
* bio_set is used to allow other portions of the IO system to
* allocate their own private memory pools for bio and iovec structures.
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index 4053cbd4490..0edb65dd8ed 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -14,6 +14,8 @@ struct bio;
struct bio_integrity_payload;
struct page;
struct block_device;
+struct io_context;
+struct cgroup_subsys_state;
typedef void (bio_end_io_t) (struct bio *, int);
typedef void (bio_destructor_t) (struct bio *);
@@ -66,6 +68,14 @@ struct bio {
bio_end_io_t *bi_end_io;
void *bi_private;
+#ifdef CONFIG_BLK_CGROUP
+ /*
+ * Optional ioc and css associated with this bio. Put on bio
+ * release. Read comment on top of bio_associate_current().
+ */
+ struct io_context *bi_ioc;
+ struct cgroup_subsys_state *bi_css;
+#endif
#if defined(CONFIG_BLK_DEV_INTEGRITY)
struct bio_integrity_payload *bi_integrity; /* data integrity */
#endif
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 4d4ac24a263..ba43f408baa 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -32,10 +32,17 @@ struct blk_trace;
struct request;
struct sg_io_hdr;
struct bsg_job;
+struct blkcg_gq;
#define BLKDEV_MIN_RQ 4
#define BLKDEV_MAX_RQ 128 /* Default maximum */
+/*
+ * Maximum number of blkcg policies allowed to be registered concurrently.
+ * Defined here to simplify include dependency.
+ */
+#define BLKCG_MAX_POLS 2
+
struct request;
typedef void (rq_end_io_fn)(struct request *, int);
@@ -363,6 +370,11 @@ struct request_queue {
struct list_head timeout_list;
struct list_head icq_list;
+#ifdef CONFIG_BLK_CGROUP
+ DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS);
+ struct blkcg_gq *root_blkg;
+ struct list_head blkg_list;
+#endif
struct queue_limits limits;
@@ -390,12 +402,17 @@ struct request_queue {
struct mutex sysfs_lock;
+ int bypass_depth;
+
#if defined(CONFIG_BLK_DEV_BSG)
bsg_job_fn *bsg_job_fn;
int bsg_job_size;
struct bsg_class_device bsg_dev;
#endif
+#ifdef CONFIG_BLK_CGROUP
+ struct list_head all_q_node;
+#endif
#ifdef CONFIG_BLK_DEV_THROTTLING
/* Throttle data */
struct throtl_data *td;
@@ -407,7 +424,7 @@ struct request_queue {
#define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */
#define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */
#define QUEUE_FLAG_DEAD 5 /* queue being torn down */
-#define QUEUE_FLAG_ELVSWITCH 6 /* don't use elevator, just do FIFO */
+#define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */
#define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */
#define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */
#define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */
@@ -491,6 +508,7 @@ static inline void queue_flag_clear(unsigned int flag, struct request_queue *q)
#define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
#define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
#define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
+#define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags)
#define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
#define blk_queue_noxmerges(q) \
test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
diff --git a/include/linux/drbd.h b/include/linux/drbd.h
index 9e5f5607eba..47e3d485058 100644
--- a/include/linux/drbd.h
+++ b/include/linux/drbd.h
@@ -53,7 +53,7 @@
extern const char *drbd_buildtag(void);
-#define REL_VERSION "8.3.11"
+#define REL_VERSION "8.3.13"
#define API_VERSION 88
#define PRO_VERSION_MIN 86
#define PRO_VERSION_MAX 96
@@ -112,8 +112,8 @@ enum drbd_ret_code {
ERR_OPEN_MD_DISK = 105,
ERR_DISK_NOT_BDEV = 107,
ERR_MD_NOT_BDEV = 108,
- ERR_DISK_TO_SMALL = 111,
- ERR_MD_DISK_TO_SMALL = 112,
+ ERR_DISK_TOO_SMALL = 111,
+ ERR_MD_DISK_TOO_SMALL = 112,
ERR_BDCLAIM_DISK = 114,
ERR_BDCLAIM_MD_DISK = 115,
ERR_MD_IDX_INVALID = 116,
diff --git a/include/linux/drbd_limits.h b/include/linux/drbd_limits.h
index 447c3675238..fb670bf603f 100644
--- a/include/linux/drbd_limits.h
+++ b/include/linux/drbd_limits.h
@@ -48,6 +48,11 @@
#define DRBD_TIMEOUT_MAX 600
#define DRBD_TIMEOUT_DEF 60 /* 6 seconds */
+ /* If backing disk takes longer than disk_timeout, mark the disk as failed */
+#define DRBD_DISK_TIMEOUT_MIN 0 /* 0 = disabled */
+#define DRBD_DISK_TIMEOUT_MAX 6000 /* 10 Minutes */
+#define DRBD_DISK_TIMEOUT_DEF 0 /* disabled */
+
/* active connection retries when C_WF_CONNECTION */
#define DRBD_CONNECT_INT_MIN 1
#define DRBD_CONNECT_INT_MAX 120
@@ -60,7 +65,7 @@
/* timeout for the ping packets.*/
#define DRBD_PING_TIMEO_MIN 1
-#define DRBD_PING_TIMEO_MAX 100
+#define DRBD_PING_TIMEO_MAX 300
#define DRBD_PING_TIMEO_DEF 5
/* max number of write requests between write barriers */
diff --git a/include/linux/drbd_nl.h b/include/linux/drbd_nl.h
index ab6159e4fcf..a8706f08ab3 100644
--- a/include/linux/drbd_nl.h
+++ b/include/linux/drbd_nl.h
@@ -31,9 +31,12 @@ NL_PACKET(disk_conf, 3,
NL_INTEGER( 56, T_MAY_IGNORE, max_bio_bvecs)
NL_BIT( 57, T_MAY_IGNORE, no_disk_barrier)
NL_BIT( 58, T_MAY_IGNORE, no_disk_drain)
+ NL_INTEGER( 89, T_MAY_IGNORE, disk_timeout)
)
-NL_PACKET(detach, 4, )
+NL_PACKET(detach, 4,
+ NL_BIT( 88, T_MANDATORY, detach_force)
+)
NL_PACKET(net_conf, 5,
NL_STRING( 8, T_MANDATORY, my_addr, 128)
diff --git a/include/linux/elevator.h b/include/linux/elevator.h
index 7d4e0356f32..c03af7687bb 100644
--- a/include/linux/elevator.h
+++ b/include/linux/elevator.h
@@ -28,12 +28,13 @@ typedef int (elevator_may_queue_fn) (struct request_queue *, int);
typedef void (elevator_init_icq_fn) (struct io_cq *);
typedef void (elevator_exit_icq_fn) (struct io_cq *);
-typedef int (elevator_set_req_fn) (struct request_queue *, struct request *, gfp_t);
+typedef int (elevator_set_req_fn) (struct request_queue *, struct request *,
+ struct bio *, gfp_t);
typedef void (elevator_put_req_fn) (struct request *);
typedef void (elevator_activate_req_fn) (struct request_queue *, struct request *);
typedef void (elevator_deactivate_req_fn) (struct request_queue *, struct request *);
-typedef void *(elevator_init_fn) (struct request_queue *);
+typedef int (elevator_init_fn) (struct request_queue *);
typedef void (elevator_exit_fn) (struct elevator_queue *);
struct elevator_ops
@@ -129,7 +130,8 @@ extern void elv_unregister_queue(struct request_queue *q);
extern int elv_may_queue(struct request_queue *, int);
extern void elv_abort_queue(struct request_queue *);
extern void elv_completed_request(struct request_queue *, struct request *);
-extern int elv_set_request(struct request_queue *, struct request *, gfp_t);
+extern int elv_set_request(struct request_queue *q, struct request *rq,
+ struct bio *bio, gfp_t gfp_mask);
extern void elv_put_request(struct request_queue *, struct request *);
extern void elv_drain_elevator(struct request_queue *);
diff --git a/include/linux/iocontext.h b/include/linux/iocontext.h
index 1a301806303..df38db2ef45 100644
--- a/include/linux/iocontext.h
+++ b/include/linux/iocontext.h
@@ -6,11 +6,7 @@
#include <linux/workqueue.h>
enum {
- ICQ_IOPRIO_CHANGED = 1 << 0,
- ICQ_CGROUP_CHANGED = 1 << 1,
ICQ_EXITED = 1 << 2,
-
- ICQ_CHANGED_MASK = ICQ_IOPRIO_CHANGED | ICQ_CGROUP_CHANGED,
};
/*
@@ -100,6 +96,7 @@ struct io_cq {
*/
struct io_context {
atomic_long_t refcount;
+ atomic_t active_ref;
atomic_t nr_tasks;
/* all the fields below are protected by this lock */
@@ -120,29 +117,37 @@ struct io_context {
struct work_struct release_work;
};
-static inline struct io_context *ioc_task_link(struct io_context *ioc)
+/**
+ * get_io_context_active - get active reference on ioc
+ * @ioc: ioc of interest
+ *
+ * Only iocs with active reference can issue new IOs. This function
+ * acquires an active reference on @ioc. The caller must already have an
+ * active reference on @ioc.
+ */
+static inline void get_io_context_active(struct io_context *ioc)
{
- /*
- * if ref count is zero, don't allow sharing (ioc is going away, it's
- * a race).
- */
- if (ioc && atomic_long_inc_not_zero(&ioc->refcount)) {
- atomic_inc(&ioc->nr_tasks);
- return ioc;
- }
+ WARN_ON_ONCE(atomic_long_read(&ioc->refcount) <= 0);
+ WARN_ON_ONCE(atomic_read(&ioc->active_ref) <= 0);
+ atomic_long_inc(&ioc->refcount);
+ atomic_inc(&ioc->active_ref);
+}
+
+static inline void ioc_task_link(struct io_context *ioc)
+{
+ get_io_context_active(ioc);
- return NULL;
+ WARN_ON_ONCE(atomic_read(&ioc->nr_tasks) <= 0);
+ atomic_inc(&ioc->nr_tasks);
}
struct task_struct;
#ifdef CONFIG_BLOCK
void put_io_context(struct io_context *ioc);
+void put_io_context_active(struct io_context *ioc);
void exit_io_context(struct task_struct *task);
struct io_context *get_task_io_context(struct task_struct *task,
gfp_t gfp_flags, int node);
-void ioc_ioprio_changed(struct io_context *ioc, int ioprio);
-void ioc_cgroup_changed(struct io_context *ioc);
-unsigned int icq_get_changed(struct io_cq *icq);
#else
struct io_context;
static inline void put_io_context(struct io_context *ioc) { }
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index d937580417b..450293f6d68 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -35,12 +35,13 @@ struct iommu_domain;
#define IOMMU_FAULT_WRITE 0x1
typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
- struct device *, unsigned long, int);
+ struct device *, unsigned long, int, void *);
struct iommu_domain {
struct iommu_ops *ops;
void *priv;
iommu_fault_handler_t handler;
+ void *handler_token;
};
#define IOMMU_CAP_CACHE_COHERENCY 0x1
@@ -95,7 +96,7 @@ extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
extern int iommu_domain_has_cap(struct iommu_domain *domain,
unsigned long cap);
extern void iommu_set_fault_handler(struct iommu_domain *domain,
- iommu_fault_handler_t handler);
+ iommu_fault_handler_t handler, void *token);
extern int iommu_device_group(struct device *dev, unsigned int *groupid);
/**
@@ -132,7 +133,8 @@ static inline int report_iommu_fault(struct iommu_domain *domain,
* invoke it.
*/
if (domain->handler)
- ret = domain->handler(domain, dev, iova, flags);
+ ret = domain->handler(domain, dev, iova, flags,
+ domain->handler_token);
return ret;
}
@@ -191,7 +193,7 @@ static inline int domain_has_cap(struct iommu_domain *domain,
}
static inline void iommu_set_fault_handler(struct iommu_domain *domain,
- iommu_fault_handler_t handler)
+ iommu_fault_handler_t handler, void *token)
{
}
diff --git a/include/linux/ioprio.h b/include/linux/ioprio.h
index 76dad480884..beb9ce1c2c2 100644
--- a/include/linux/ioprio.h
+++ b/include/linux/ioprio.h
@@ -42,26 +42,14 @@ enum {
};
/*
- * if process has set io priority explicitly, use that. if not, convert
- * the cpu scheduler nice value to an io priority
+ * Fallback BE priority
*/
#define IOPRIO_NORM (4)
-static inline int task_ioprio(struct io_context *ioc)
-{
- if (ioprio_valid(ioc->ioprio))
- return IOPRIO_PRIO_DATA(ioc->ioprio);
-
- return IOPRIO_NORM;
-}
-
-static inline int task_ioprio_class(struct io_context *ioc)
-{
- if (ioprio_valid(ioc->ioprio))
- return IOPRIO_PRIO_CLASS(ioc->ioprio);
-
- return IOPRIO_CLASS_BE;
-}
+/*
+ * if process has set io priority explicitly, use that. if not, convert
+ * the cpu scheduler nice value to an io priority
+ */
static inline int task_nice_ioprio(struct task_struct *task)
{
return (task_nice(task) + 20) / 5;
diff --git a/init/Kconfig b/init/Kconfig
index 81816b82860..1e004d05746 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -803,7 +803,7 @@ config RT_GROUP_SCHED
endif #CGROUP_SCHED
config BLK_CGROUP
- tristate "Block IO controller"
+ bool "Block IO controller"
depends on BLOCK
default n
---help---
diff --git a/kernel/fork.c b/kernel/fork.c
index 017fb23d598..31a32c7dd16 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -976,9 +976,8 @@ static int copy_io(unsigned long clone_flags, struct task_struct *tsk)
* Share io context with parent, if CLONE_IO is set
*/
if (clone_flags & CLONE_IO) {
- tsk->io_context = ioc_task_link(ioc);
- if (unlikely(!tsk->io_context))
- return -ENOMEM;
+ ioc_task_link(ioc);
+ tsk->io_context = ioc;
} else if (ioprio_valid(ioc->ioprio)) {
new_ioc = get_task_io_context(tsk, GFP_KERNEL, NUMA_NO_NODE);
if (unlikely(!new_ioc))
diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index 13ef2338be4..518aea714d2 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -430,7 +430,7 @@ static struct dma_debug_entry *__dma_entry_alloc(void)
*/
static struct dma_debug_entry *dma_entry_alloc(void)
{
- struct dma_debug_entry *entry = NULL;
+ struct dma_debug_entry *entry;
unsigned long flags;
spin_lock_irqsave(&free_entries_lock, flags);
@@ -438,11 +438,14 @@ static struct dma_debug_entry *dma_entry_alloc(void)
if (list_empty(&free_entries)) {
pr_err("DMA-API: debugging out of memory - disabling\n");
global_disable = true;
- goto out;
+ spin_unlock_irqrestore(&free_entries_lock, flags);
+ return NULL;
}
entry = __dma_entry_alloc();
+ spin_unlock_irqrestore(&free_entries_lock, flags);
+
#ifdef CONFIG_STACKTRACE
entry->stacktrace.max_entries = DMA_DEBUG_STACKTRACE_ENTRIES;
entry->stacktrace.entries = entry->st_entries;
@@ -450,9 +453,6 @@ static struct dma_debug_entry *dma_entry_alloc(void)
save_stack_trace(&entry->stacktrace);
#endif
-out:
- spin_unlock_irqrestore(&free_entries_lock, flags);
-
return entry;
}
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 285a81e87ec..e198831276a 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -3036,7 +3036,8 @@ int hugetlb_reserve_pages(struct inode *inode,
region_add(&inode->i_mapping->private_list, from, to);
return 0;
out_err:
- resv_map_put(vma);
+ if (vma)
+ resv_map_put(vma);
return ret;
}