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| author | Christoph Hellwig <hch@lst.de> | 2020-06-05 19:44:09 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-06-07 08:56:50 -0600 |
| commit | d94ecfc399715f06da347922e7979c088b1d8834 (patch) | |
| tree | 854865cc1204b8f951610b46cfe788741114cc75 /block/blk-mq.h | |
| parent | 5aec598c456fe3c1b71a1202cbb42bdc2a643277 (diff) | |
| download | lwn-d94ecfc399715f06da347922e7979c088b1d8834.tar.gz lwn-d94ecfc399715f06da347922e7979c088b1d8834.zip | |
blk-mq: split out a __blk_mq_get_driver_tag helper
Allocation of the driver tag in the case of using a scheduler shares very
little code with the "normal" tag allocation. Split out a new helper to
streamline this path, and untangle it from the complex normal tag
allocation.
This way also avoids to fail driver tag allocation because of inactive hctx
during cpu hotplug, and fixes potential hang risk.
Fixes: bf0beec0607d ("blk-mq: drain I/O when all CPUs in a hctx are offline")
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: John Garry <john.garry@huawei.com>
Cc: Dongli Zhang <dongli.zhang@oracle.com>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Daniel Wagner <dwagner@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-mq.h')
| -rw-r--r-- | block/blk-mq.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/block/blk-mq.h b/block/blk-mq.h index a139b0631817..b3ce0f3a2ad2 100644 --- a/block/blk-mq.h +++ b/block/blk-mq.h @@ -44,7 +44,6 @@ bool blk_mq_dispatch_rq_list(struct request_queue *, struct list_head *, bool); void blk_mq_add_to_requeue_list(struct request *rq, bool at_head, bool kick_requeue_list); void blk_mq_flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list); -bool blk_mq_get_driver_tag(struct request *rq); struct request *blk_mq_dequeue_from_ctx(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *start); |