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bcache: fix I/O accounting leak in detached_dev_do_request 

When a bcache device is detached, discard requests are completed
immediately. However, the I/O accounting started in
cached_dev_make_request() is not ended, leading to 100% disk
utilization reports in iostat. Add the missing bio_end_io_acct() call.

Fixes: cafe563591 ("bcache: A block layer cache")
Signed-off-by: Shida Zhang <zhangshida@kylinos.cn>
Acked-by: Coly Li <colyli@fnnas.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Shida Zhang 2026-01-27 16:21:12 +08:00 committed by Jens Axboe
parent 6ea84d7a92
commit 4da7c5c3ec
1 changed files with 1 additions and 0 deletions
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drivers/md/bcache/request.c
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@ -1107,6 +1107,7 @@ static void detached_dev_do_request(struct bcache_device *d,
if (bio_op(orig_bio) == REQ_OP_DISCARD &&
!bdev_max_discard_sectors(dc->bdev)) {
bio_end_io_acct(orig_bio, start_time);
bio_endio(orig_bio);
return;
}