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authorLinus Torvalds <torvalds@linux-foundation.org>2010-12-20 09:19:46 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-12-20 09:19:46 -0800
commit7f8635cc9e66a26d7280ba680b044fa2f65104af (patch)
tree0d8506e86d07e15c473aca1a09af7ad6ff7d8b49 /block
parent3cb50ddf97a0a1ca4c68bc12fa1e727a6b45fbf2 (diff)
parent0fc13c8995cd96f4123de400c71c223d80400ed9 (diff)
downloadlinux-linaro-precise-7f8635cc9e66a26d7280ba680b044fa2f65104af.tar.gz
Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block
* 'for-linus' of git://git.kernel.dk/linux-2.6-block: cciss: fix cciss_revalidate panic block: max hardware sectors limit wrapper block: Deprecate QUEUE_FLAG_CLUSTER and use queue_limits instead blk-throttle: Correct the placement of smp_rmb() blk-throttle: Trim/adjust slice_end once a bio has been dispatched block: check for proper length of iov entries earlier in blk_rq_map_user_iov() drbd: fix for spin_lock_irqsave in endio callback drbd: don't recvmsg with zero length
Diffstat (limited to 'block')
-rw-r--r--block/blk-map.c5
-rw-r--r--block/blk-merge.c6
-rw-r--r--block/blk-settings.c51
-rw-r--r--block/blk-sysfs.c2
-rw-r--r--block/blk-throttle.c39
5 files changed, 54 insertions, 49 deletions
diff --git a/block/blk-map.c b/block/blk-map.c
index 5d5dbe47c22..e663ac2d8e6 100644
--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -201,12 +201,13 @@ int blk_rq_map_user_iov(struct request_queue *q, struct request *rq,
for (i = 0; i < iov_count; i++) {
unsigned long uaddr = (unsigned long)iov[i].iov_base;
+ if (!iov[i].iov_len)
+ return -EINVAL;
+
if (uaddr & queue_dma_alignment(q)) {
unaligned = 1;
break;
}
- if (!iov[i].iov_len)
- return -EINVAL;
}
if (unaligned || (q->dma_pad_mask & len) || map_data)
diff --git a/block/blk-merge.c b/block/blk-merge.c
index 77b7c26df6b..74bc4a768f3 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -21,7 +21,7 @@ static unsigned int __blk_recalc_rq_segments(struct request_queue *q,
return 0;
fbio = bio;
- cluster = test_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags);
+ cluster = blk_queue_cluster(q);
seg_size = 0;
nr_phys_segs = 0;
for_each_bio(bio) {
@@ -87,7 +87,7 @@ EXPORT_SYMBOL(blk_recount_segments);
static int blk_phys_contig_segment(struct request_queue *q, struct bio *bio,
struct bio *nxt)
{
- if (!test_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags))
+ if (!blk_queue_cluster(q))
return 0;
if (bio->bi_seg_back_size + nxt->bi_seg_front_size >
@@ -123,7 +123,7 @@ int blk_rq_map_sg(struct request_queue *q, struct request *rq,
int nsegs, cluster;
nsegs = 0;
- cluster = test_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags);
+ cluster = blk_queue_cluster(q);
/*
* for each bio in rq
diff --git a/block/blk-settings.c b/block/blk-settings.c
index 701859fb964..36c8c1f2af1 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -126,7 +126,7 @@ void blk_set_default_limits(struct queue_limits *lim)
lim->alignment_offset = 0;
lim->io_opt = 0;
lim->misaligned = 0;
- lim->no_cluster = 0;
+ lim->cluster = 1;
}
EXPORT_SYMBOL(blk_set_default_limits);
@@ -229,8 +229,8 @@ void blk_queue_bounce_limit(struct request_queue *q, u64 dma_mask)
EXPORT_SYMBOL(blk_queue_bounce_limit);
/**
- * blk_queue_max_hw_sectors - set max sectors for a request for this queue
- * @q: the request queue for the device
+ * blk_limits_max_hw_sectors - set hard and soft limit of max sectors for request
+ * @limits: the queue limits
* @max_hw_sectors: max hardware sectors in the usual 512b unit
*
* Description:
@@ -244,7 +244,7 @@ EXPORT_SYMBOL(blk_queue_bounce_limit);
* per-device basis in /sys/block/<device>/queue/max_sectors_kb.
* The soft limit can not exceed max_hw_sectors.
**/
-void blk_queue_max_hw_sectors(struct request_queue *q, unsigned int max_hw_sectors)
+void blk_limits_max_hw_sectors(struct queue_limits *limits, unsigned int max_hw_sectors)
{
if ((max_hw_sectors << 9) < PAGE_CACHE_SIZE) {
max_hw_sectors = 1 << (PAGE_CACHE_SHIFT - 9);
@@ -252,9 +252,23 @@ void blk_queue_max_hw_sectors(struct request_queue *q, unsigned int max_hw_secto
__func__, max_hw_sectors);
}
- q->limits.max_hw_sectors = max_hw_sectors;
- q->limits.max_sectors = min_t(unsigned int, max_hw_sectors,
- BLK_DEF_MAX_SECTORS);
+ limits->max_hw_sectors = max_hw_sectors;
+ limits->max_sectors = min_t(unsigned int, max_hw_sectors,
+ BLK_DEF_MAX_SECTORS);
+}
+EXPORT_SYMBOL(blk_limits_max_hw_sectors);
+
+/**
+ * blk_queue_max_hw_sectors - set max sectors for a request for this queue
+ * @q: the request queue for the device
+ * @max_hw_sectors: max hardware sectors in the usual 512b unit
+ *
+ * Description:
+ * See description for blk_limits_max_hw_sectors().
+ **/
+void blk_queue_max_hw_sectors(struct request_queue *q, unsigned int max_hw_sectors)
+{
+ blk_limits_max_hw_sectors(&q->limits, max_hw_sectors);
}
EXPORT_SYMBOL(blk_queue_max_hw_sectors);
@@ -464,15 +478,6 @@ EXPORT_SYMBOL(blk_queue_io_opt);
void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b)
{
blk_stack_limits(&t->limits, &b->limits, 0);
-
- if (!t->queue_lock)
- WARN_ON_ONCE(1);
- else if (!test_bit(QUEUE_FLAG_CLUSTER, &b->queue_flags)) {
- unsigned long flags;
- spin_lock_irqsave(t->queue_lock, flags);
- queue_flag_clear(QUEUE_FLAG_CLUSTER, t);
- spin_unlock_irqrestore(t->queue_lock, flags);
- }
}
EXPORT_SYMBOL(blk_queue_stack_limits);
@@ -545,7 +550,7 @@ int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
t->io_min = max(t->io_min, b->io_min);
t->io_opt = lcm(t->io_opt, b->io_opt);
- t->no_cluster |= b->no_cluster;
+ t->cluster &= b->cluster;
t->discard_zeroes_data &= b->discard_zeroes_data;
/* Physical block size a multiple of the logical block size? */
@@ -641,7 +646,6 @@ void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
sector_t offset)
{
struct request_queue *t = disk->queue;
- struct request_queue *b = bdev_get_queue(bdev);
if (bdev_stack_limits(&t->limits, bdev, offset >> 9) < 0) {
char top[BDEVNAME_SIZE], bottom[BDEVNAME_SIZE];
@@ -652,17 +656,6 @@ void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
printk(KERN_NOTICE "%s: Warning: Device %s is misaligned\n",
top, bottom);
}
-
- if (!t->queue_lock)
- WARN_ON_ONCE(1);
- else if (!test_bit(QUEUE_FLAG_CLUSTER, &b->queue_flags)) {
- unsigned long flags;
-
- spin_lock_irqsave(t->queue_lock, flags);
- if (!test_bit(QUEUE_FLAG_CLUSTER, &b->queue_flags))
- queue_flag_clear(QUEUE_FLAG_CLUSTER, t);
- spin_unlock_irqrestore(t->queue_lock, flags);
- }
}
EXPORT_SYMBOL(disk_stack_limits);
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 013457f47fd..41fb69150b4 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -119,7 +119,7 @@ static ssize_t queue_max_integrity_segments_show(struct request_queue *q, char *
static ssize_t queue_max_segment_size_show(struct request_queue *q, char *page)
{
- if (test_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags))
+ if (blk_queue_cluster(q))
return queue_var_show(queue_max_segment_size(q), (page));
return queue_var_show(PAGE_CACHE_SIZE, (page));
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 004be80fd89..381b09bb562 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -355,6 +355,12 @@ throtl_start_new_slice(struct throtl_data *td, struct throtl_grp *tg, bool rw)
tg->slice_end[rw], jiffies);
}
+static inline void throtl_set_slice_end(struct throtl_data *td,
+ struct throtl_grp *tg, bool rw, unsigned long jiffy_end)
+{
+ tg->slice_end[rw] = roundup(jiffy_end, throtl_slice);
+}
+
static inline void throtl_extend_slice(struct throtl_data *td,
struct throtl_grp *tg, bool rw, unsigned long jiffy_end)
{
@@ -391,6 +397,16 @@ throtl_trim_slice(struct throtl_data *td, struct throtl_grp *tg, bool rw)
if (throtl_slice_used(td, tg, rw))
return;
+ /*
+ * A bio has been dispatched. Also adjust slice_end. It might happen
+ * that initially cgroup limit was very low resulting in high
+ * slice_end, but later limit was bumped up and bio was dispached
+ * sooner, then we need to reduce slice_end. A high bogus slice_end
+ * is bad because it does not allow new slice to start.
+ */
+
+ throtl_set_slice_end(td, tg, rw, jiffies + throtl_slice);
+
time_elapsed = jiffies - tg->slice_start[rw];
nr_slices = time_elapsed / throtl_slice;
@@ -709,26 +725,21 @@ static void throtl_process_limit_change(struct throtl_data *td)
struct throtl_grp *tg;
struct hlist_node *pos, *n;
- /*
- * Make sure atomic_inc() effects from
- * throtl_update_blkio_group_read_bps(), group of functions are
- * visible.
- * Is this required or smp_mb__after_atomic_inc() was suffcient
- * after the atomic_inc().
- */
- smp_rmb();
if (!atomic_read(&td->limits_changed))
return;
throtl_log(td, "limit changed =%d", atomic_read(&td->limits_changed));
- hlist_for_each_entry_safe(tg, pos, n, &td->tg_list, tg_node) {
- /*
- * Do I need an smp_rmb() here to make sure tg->limits_changed
- * update is visible. I am relying on smp_rmb() at the
- * beginning of function and not putting a new one here.
- */
+ /*
+ * Make sure updates from throtl_update_blkio_group_read_bps() group
+ * of functions to tg->limits_changed are visible. We do not
+ * want update td->limits_changed to be visible but update to
+ * tg->limits_changed not being visible yet on this cpu. Hence
+ * the read barrier.
+ */
+ smp_rmb();
+ hlist_for_each_entry_safe(tg, pos, n, &td->tg_list, tg_node) {
if (throtl_tg_on_rr(tg) && tg->limits_changed) {
throtl_log_tg(td, tg, "limit change rbps=%llu wbps=%llu"
" riops=%u wiops=%u", tg->bps[READ],