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block: drain queue before waiting for q_usage_counter becoming zero

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Now we track legacy requests with .q_usage_counter in commit 055f6e18e0
("block: Make q_usage_counter also track legacy requests"), but that
commit never runs and drains legacy queue before waiting for this counter
becoming zero, then IO hang is caused in the test of pulling disk during IO.

This patch fixes the issue by draining requests before waiting for
q_usage_counter becoming zero, both Mauricio and chenxiang reported this
issue, and observed that it can be fixed by this patch.

Link: https://marc.info/?l=linux-block&m=151192424731797&w=2
Fixes: 055f6e18e08f("block: Make q_usage_counter also track legacy requests")
Cc: Wen Xiong <[email protected]>
Tested-by: "chenxiang (M)" <[email protected]>
Tested-by: Mauricio Faria de Oliveira <[email protected]>
Signed-off-by: Ming Lei <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Ming Lei 2017-11-30 07:56:35 +08:00 • committed by Jens Axboe
commit 454be724f6
3 changed files with 11 additions and 2 deletions
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2
block/blk.h
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@ -330,4 +330,6 @@ static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio)
}
#endif /* CONFIG_BOUNCE */
extern void blk_drain_queue(struct request_queue *q);
#endif /* BLK_INTERNAL_H */