summaryrefslogtreecommitdiff
path: root/block/blk-core.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2014-10-18 11:53:51 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-10-18 11:53:51 -0700
commitd3dc366bbaf07c125561e90d6da4bb147741101a (patch)
tree6eb7e79a8ec9df1fa705393c6d15ccea3d104661 /block/blk-core.c
parent511c41d9e6665a07aca94eb00983cf6d77dd87ff (diff)
parente19a8a0ad2d255316830ead05b59c5a704434cbb (diff)
downloadkernel-d3dc366bbaf07c125561e90d6da4bb147741101a.tar.gz
Merge branch 'for-3.18/core' of git://git.kernel.dk/linux-block
Pull core block layer changes from Jens Axboe: "This is the core block IO pull request for 3.18. Apart from the new and improved flush machinery for blk-mq, this is all mostly bug fixes and cleanups. - blk-mq timeout updates and fixes from Christoph. - Removal of REQ_END, also from Christoph. We pass it through the ->queue_rq() hook for blk-mq instead, freeing up one of the request bits. The space was overly tight on 32-bit, so Martin also killed REQ_KERNEL since it's no longer used. - blk integrity updates and fixes from Martin and Gu Zheng. - Update to the flush machinery for blk-mq from Ming Lei. Now we have a per hardware context flush request, which both cleans up the code should scale better for flush intensive workloads on blk-mq. - Improve the error printing, from Rob Elliott. - Backing device improvements and cleanups from Tejun. - Fixup of a misplaced rq_complete() tracepoint from Hannes. - Make blk_get_request() return error pointers, fixing up issues where we NULL deref when a device goes bad or missing. From Joe Lawrence. - Prep work for drastically reducing the memory consumption of dm devices from Junichi Nomura. This allows creating clone bio sets without preallocating a lot of memory. - Fix a blk-mq hang on certain combinations of queue depths and hardware queues from me. - Limit memory consumption for blk-mq devices for crash dump scenarios and drivers that use crazy high depths (certain SCSI shared tag setups). We now just use a single queue and limited depth for that" * 'for-3.18/core' of git://git.kernel.dk/linux-block: (58 commits) block: Remove REQ_KERNEL blk-mq: allocate cpumask on the home node bio-integrity: remove the needless fail handle of bip_slab creating block: include func name in __get_request prints block: make blk_update_request print prefix match ratelimited prefix blk-merge: don't compute bi_phys_segments from bi_vcnt for cloned bio block: fix alignment_offset math that assumes io_min is a power-of-2 blk-mq: Make bt_clear_tag() easier to read blk-mq: fix potential hang if rolling wakeup depth is too high block: add bioset_create_nobvec() block: use bio_clone_fast() in blk_rq_prep_clone() block: misplaced rq_complete tracepoint sd: Honor block layer integrity handling flags block: Replace strnicmp with strncasecmp block: Add T10 Protection Information functions block: Don't merge requests if integrity flags differ block: Integrity checksum flag block: Relocate bio integrity flags block: Add a disk flag to block integrity profile block: Add prefix to block integrity profile flags ...
Diffstat (limited to 'block/blk-core.c')
-rw-r--r--block/blk-core.c67
1 files changed, 31 insertions, 36 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index 9c888bd22b00..0421b53e6431 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -83,18 +83,14 @@ void blk_queue_congestion_threshold(struct request_queue *q)
* @bdev: device
*
* Locates the passed device's request queue and returns the address of its
- * backing_dev_info
- *
- * Will return NULL if the request queue cannot be located.
+ * backing_dev_info. This function can only be called if @bdev is opened
+ * and the return value is never NULL.
*/
struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev)
{
- struct backing_dev_info *ret = NULL;
struct request_queue *q = bdev_get_queue(bdev);
- if (q)
- ret = &q->backing_dev_info;
- return ret;
+ return &q->backing_dev_info;
}
EXPORT_SYMBOL(blk_get_backing_dev_info);
@@ -394,11 +390,13 @@ static void __blk_drain_queue(struct request_queue *q, bool drain_all)
* be drained. Check all the queues and counters.
*/
if (drain_all) {
+ struct blk_flush_queue *fq = blk_get_flush_queue(q, NULL);
drain |= !list_empty(&q->queue_head);
for (i = 0; i < 2; i++) {
drain |= q->nr_rqs[i];
drain |= q->in_flight[i];
- drain |= !list_empty(&q->flush_queue[i]);
+ if (fq)
+ drain |= !list_empty(&fq->flush_queue[i]);
}
}
@@ -604,9 +602,6 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id)
#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);
INIT_DELAYED_WORK(&q->delay_work, blk_delay_work);
kobject_init(&q->kobj, &blk_queue_ktype);
@@ -709,8 +704,8 @@ blk_init_allocated_queue(struct request_queue *q, request_fn_proc *rfn,
if (!q)
return NULL;
- q->flush_rq = kzalloc(sizeof(struct request), GFP_KERNEL);
- if (!q->flush_rq)
+ q->fq = blk_alloc_flush_queue(q, NUMA_NO_NODE, 0);
+ if (!q->fq)
return NULL;
if (blk_init_rl(&q->root_rl, q, GFP_KERNEL))
@@ -746,7 +741,7 @@ blk_init_allocated_queue(struct request_queue *q, request_fn_proc *rfn,
return q;
fail:
- kfree(q->flush_rq);
+ blk_free_flush_queue(q->fq);
return NULL;
}
EXPORT_SYMBOL(blk_init_allocated_queue);
@@ -934,8 +929,8 @@ static struct io_context *rq_ioc(struct bio *bio)
* pressure or if @q is dead.
*
* Must be called with @q->queue_lock held and,
- * Returns %NULL on failure, with @q->queue_lock held.
- * Returns !%NULL on success, with @q->queue_lock *not held*.
+ * Returns ERR_PTR on failure, with @q->queue_lock held.
+ * Returns request pointer on success, with @q->queue_lock *not held*.
*/
static struct request *__get_request(struct request_list *rl, int rw_flags,
struct bio *bio, gfp_t gfp_mask)
@@ -949,7 +944,7 @@ static struct request *__get_request(struct request_list *rl, int rw_flags,
int may_queue;
if (unlikely(blk_queue_dying(q)))
- return NULL;
+ return ERR_PTR(-ENODEV);
may_queue = elv_may_queue(q, rw_flags);
if (may_queue == ELV_MQUEUE_NO)
@@ -974,7 +969,7 @@ static struct request *__get_request(struct request_list *rl, int rw_flags,
* process is not a "batcher", and not
* exempted by the IO scheduler
*/
- return NULL;
+ return ERR_PTR(-ENOMEM);
}
}
}
@@ -992,7 +987,7 @@ static struct request *__get_request(struct request_list *rl, int rw_flags,
* allocated with any setting of ->nr_requests
*/
if (rl->count[is_sync] >= (3 * q->nr_requests / 2))
- return NULL;
+ return ERR_PTR(-ENOMEM);
q->nr_rqs[is_sync]++;
rl->count[is_sync]++;
@@ -1065,8 +1060,8 @@ fail_elvpriv:
* 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));
+ printk_ratelimited(KERN_WARNING "%s: dev %s: request aux data allocation failed, iosched may be disturbed\n",
+ __func__, dev_name(q->backing_dev_info.dev));
rq->cmd_flags &= ~REQ_ELVPRIV;
rq->elv.icq = NULL;
@@ -1097,7 +1092,7 @@ fail_alloc:
rq_starved:
if (unlikely(rl->count[is_sync] == 0))
rl->starved[is_sync] = 1;
- return NULL;
+ return ERR_PTR(-ENOMEM);
}
/**
@@ -1111,8 +1106,8 @@ rq_starved:
* function keeps retrying under memory pressure and fails iff @q is dead.
*
* Must be called with @q->queue_lock held and,
- * Returns %NULL on failure, with @q->queue_lock held.
- * Returns !%NULL on success, with @q->queue_lock *not held*.
+ * Returns ERR_PTR on failure, with @q->queue_lock held.
+ * Returns request pointer on success, with @q->queue_lock *not held*.
*/
static struct request *get_request(struct request_queue *q, int rw_flags,
struct bio *bio, gfp_t gfp_mask)
@@ -1125,12 +1120,12 @@ static struct request *get_request(struct request_queue *q, int rw_flags,
rl = blk_get_rl(q, bio); /* transferred to @rq on success */
retry:
rq = __get_request(rl, rw_flags, bio, gfp_mask);
- if (rq)
+ if (!IS_ERR(rq))
return rq;
if (!(gfp_mask & __GFP_WAIT) || unlikely(blk_queue_dying(q))) {
blk_put_rl(rl);
- return NULL;
+ return rq;
}
/* wait on @rl and retry */
@@ -1167,7 +1162,7 @@ static struct request *blk_old_get_request(struct request_queue *q, int rw,
spin_lock_irq(q->queue_lock);
rq = get_request(q, rw, NULL, gfp_mask);
- if (!rq)
+ if (IS_ERR(rq))
spin_unlock_irq(q->queue_lock);
/* q->queue_lock is unlocked at this point */
@@ -1219,8 +1214,8 @@ struct request *blk_make_request(struct request_queue *q, struct bio *bio,
{
struct request *rq = blk_get_request(q, bio_data_dir(bio), gfp_mask);
- if (unlikely(!rq))
- return ERR_PTR(-ENOMEM);
+ if (IS_ERR(rq))
+ return rq;
blk_rq_set_block_pc(rq);
@@ -1614,8 +1609,8 @@ get_rq:
* Returns with the queue unlocked.
*/
req = get_request(q, rw_flags, bio, GFP_NOIO);
- if (unlikely(!req)) {
- bio_endio(bio, -ENODEV); /* @q is dead */
+ if (IS_ERR(req)) {
+ bio_endio(bio, PTR_ERR(req)); /* @q is dead */
goto out_unlock;
}
@@ -2405,11 +2400,11 @@ bool blk_update_request(struct request *req, int error, unsigned int nr_bytes)
{
int total_bytes;
+ trace_block_rq_complete(req->q, req, nr_bytes);
+
if (!req->bio)
return false;
- trace_block_rq_complete(req->q, req, nr_bytes);
-
/*
* For fs requests, rq is just carrier of independent bio's
* and each partial completion should be handled separately.
@@ -2449,8 +2444,8 @@ bool blk_update_request(struct request *req, int error, unsigned int nr_bytes)
error_type = "I/O";
break;
}
- printk_ratelimited(KERN_ERR "end_request: %s error, dev %s, sector %llu\n",
- error_type, req->rq_disk ?
+ printk_ratelimited(KERN_ERR "%s: %s error, dev %s, sector %llu\n",
+ __func__, error_type, req->rq_disk ?
req->rq_disk->disk_name : "?",
(unsigned long long)blk_rq_pos(req));
@@ -2931,7 +2926,7 @@ int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
blk_rq_init(NULL, rq);
__rq_for_each_bio(bio_src, rq_src) {
- bio = bio_clone_bioset(bio_src, gfp_mask, bs);
+ bio = bio_clone_fast(bio_src, gfp_mask, bs);
if (!bio)
goto free_and_out;