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btrfs: fix the length of reserved qgroup to free

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BugLink: https://bugs.launchpad.net/bugs/2100292

commit 2b084d8205949dd804e279df8e68531da78be1e8 upstream.

The dealloc flag may be cleared and the extent won't reach the disk in
cow_file_range when errors path. The reserved qgroup space is freed in
commit 30479f31d44d ("btrfs: fix qgroup reserve leaks in
cow_file_range"). However, the length of untouched region to free needs
to be adjusted with the correct remaining region size.

Fixes: 30479f31d44d ("btrfs: fix qgroup reserve leaks in cow_file_range")
CC: stable@vger.kernel.org # 6.11+
Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Boris Burkov <boris@bur.io>
Signed-off-by: Haisu Wang <haisuwang@tencent.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[koichiroden: adjusted conotext due to missing commit:
4cf7e0562f5f ("btrfs: convert cow_file_range() to take a folio")]
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
This commit is contained in:
Haisu Wang
2025-02-26 22:49:14 +09:00
committed by Stefan Bader
parent 69d0641c05
commit 5ce800cb29
1 changed files with 1 additions and 1 deletions
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fs/btrfs/inode.c
+1 -1
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@@ -1570,7 +1570,7 @@ out_unlock:
clear_bits |= EXTENT_CLEAR_DATA_RESV;
extent_clear_unlock_delalloc(inode, start, end, locked_page,
clear_bits, page_ops);
btrfs_qgroup_free_data(inode, NULL, start, cur_alloc_size, NULL);
btrfs_qgroup_free_data(inode, NULL, start, end - start + 1, NULL);
}
return ret;
}