bcache: use bio cloning for detached device requests

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[ Upstream commit 3ef825dfd4 ]

Previously, bcache hijacked the bi_end_io and bi_private fields of
the incoming bio when the backing device was in a detached state.
This is fragile and breaks if the bio is needed to be processed by
other layers.

This patch transitions to using a cloned bio embedded within a private
structure. This ensures the original bio's metadata remains untouched.

Fixes: 53280e3984 ("bcache: fix improper use of bi_end_io")
Co-developed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Shida Zhang <zhangshida@kylinos.cn>
Acked-by: Coly Li <colyli@fnnas.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Stable-dep-of: 4da7c5c3ec ("bcache: fix I/O accounting leak in detached_dev_do_request")
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Shida Zhang 2026-01-22 14:13:21 +08:00 • committed by Greg Kroah-Hartman

parent db6e287bd6

commit 7b72d76a58

3 changed files with 54 additions and 46 deletions

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9

drivers/md/bcache/bcache.h

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81

drivers/md/bcache/request.c

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12

drivers/md/bcache/super.c

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