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btrfs: clean up target device if block group marking fails

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btrfs_dev_replace_start() adds the replacement target to the device list
before marking block groups to copy. If marking fails, returning
directly leaves the target linked and keeps the device accounting
incremented.

Jump to the existing cleanup path so the target device is removed and
released on failure.

The issue was found by a failure-path metadata residual analyzer and
verified with targeted failure injection on v6.14.

Assisted-by: Codex:gpt-5
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Guanghui Yang <3497809730@qq.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Guanghui Yang 2026-08-08 14:38:32 +08:00 committed by David Sterba
parent 4096e2a06f
commit 40fe154ba0
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/dev-replace.c
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@ -626,7 +626,7 @@ static int btrfs_dev_replace_start(struct btrfs_fs_info *fs_info,
ret = mark_block_group_to_copy(fs_info, src_device);
if (ret)
return ret;
goto leave;
down_write(&dev_replace->rwsem);
dev_replace->replace_task = current;