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blk-mq: wait on correct sbitmap_queue in blk_mq_mark_tag_wait
authorKemeng Shi <shikemeng@huaweicloud.com>
Wed, 18 Jan 2023 09:37:15 +0000 (17:37 +0800)
committerJens Axboe <axboe@kernel.dk>
Mon, 6 Feb 2023 16:22:28 +0000 (09:22 -0700)
commit98b99e9412d0cde8c7b442bf5efb09528a2ede8b
tree17eb2c6e139b3f1ffa23674e3afeb2c1b66f4ece
parentc31e76bcc379182fe67a82c618493b7b8868c672
blk-mq: wait on correct sbitmap_queue in blk_mq_mark_tag_wait

For shared queues case, we will only wait on bitmap_tags if we fail to get
driver tag. However, rq could be from breserved_tags, then two problems
will occur:
1. io hung if no tag is currently allocated from bitmap_tags.
2. unnecessary wakeup when tag is freed to bitmap_tags while no tag is
freed to breserved_tags.
Wait on the bitmap which rq from to fix this.

Fixes: f906a6a0f426 ("blk-mq: improve tag waiting setup for non-shared tags")
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
block/blk-mq.c