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elevator: printk a warning if switching to a new io scheduler fails

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printk a warning to indicate that the io scheduler has been set to none
if switching to a new io scheduler fails.

Suggested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jinlong Chen <nickyc975@zju.edu.cn>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/d51ed0fb457db7a4f9cbb0dbce36d534e22be457.1669126766.git.nickyc975@zju.edu.cn
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jinlong Chen
2022-11-22 22:21:24 +08:00
committed by Jens Axboe
parent ac1171bd2c
commit e0cca8bc9c
1 changed files with 6 additions and 0 deletions
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6
block/elevator.c
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@@ -683,6 +683,12 @@ int elevator_switch(struct request_queue *q, struct elevator_type *new_e)
out_unfreeze:
blk_mq_unquiesce_queue(q);
blk_mq_unfreeze_queue(q);
if (ret) {
pr_warn("elv: switch to \"%s\" failed, falling back to \"none\"\n",
new_e->elevator_name);
}
return ret;
}