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| author | Keith Busch <keith.busch@intel.com> | 2015-03-11 23:56:39 -0400 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2015-03-13 08:30:55 -0600 |
| commit | bfd343aa1718457d34b99ce6573085ac340da288 (patch) | |
| tree | 43e7156fc29628569a5a065e38e54719fa754325 /block/blk-mq.c | |
| parent | b94ec296403e99d5ac9a8c48332cec4118d44b94 (diff) | |
| download | linux-stable-bfd343aa1718457d34b99ce6573085ac340da288.tar.gz linux-stable-bfd343aa1718457d34b99ce6573085ac340da288.tar.bz2 linux-stable-bfd343aa1718457d34b99ce6573085ac340da288.zip | |
blk-mq: don't wait in blk_mq_queue_enter() if __GFP_WAIT isn't set
Return -EBUSY if we're unable to enter a queue immediately when
allocating a blk-mq request without __GFP_WAIT.
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/blk-mq.c')
| -rw-r--r-- | block/blk-mq.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c index 06614ce0f475..59fa23935a0f 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -77,7 +77,7 @@ static void blk_mq_hctx_clear_pending(struct blk_mq_hw_ctx *hctx, clear_bit(CTX_TO_BIT(hctx, ctx), &bm->word); } -static int blk_mq_queue_enter(struct request_queue *q) +static int blk_mq_queue_enter(struct request_queue *q, gfp_t gfp) { while (true) { int ret; @@ -85,6 +85,9 @@ static int blk_mq_queue_enter(struct request_queue *q) if (percpu_ref_tryget_live(&q->mq_usage_counter)) return 0; + if (!(gfp & __GFP_WAIT)) + return -EBUSY; + ret = wait_event_interruptible(q->mq_freeze_wq, !q->mq_freeze_depth || blk_queue_dying(q)); if (blk_queue_dying(q)) @@ -256,7 +259,7 @@ struct request *blk_mq_alloc_request(struct request_queue *q, int rw, gfp_t gfp, struct blk_mq_alloc_data alloc_data; int ret; - ret = blk_mq_queue_enter(q); + ret = blk_mq_queue_enter(q, gfp); if (ret) return ERR_PTR(ret); @@ -1186,7 +1189,7 @@ static struct request *blk_mq_map_request(struct request_queue *q, int rw = bio_data_dir(bio); struct blk_mq_alloc_data alloc_data; - if (unlikely(blk_mq_queue_enter(q))) { + if (unlikely(blk_mq_queue_enter(q, GFP_KERNEL))) { bio_endio(bio, -EIO); return NULL; } |