From: Shida Zhang <zhangshida@kylinos.cn>
Date: Tue, 27 Jan 2026 08:21:12 +0000 (+0800)
Subject: bcache: fix I/O accounting leak in detached_dev_do_request
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4da7c5c3ec34d839bba6e035c3d05c447a2f9d4f;p=thirdparty%2Fkernel%2Flinux.git

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: cafe56359144 ("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>
---

diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
index c2f38907a2a3..3fa3b13a410f 100644
--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -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;
 	}