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btrfs: properly clear end of the unreserved range in cow_file_range

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commit 12b2d64e59 upstream.

When the call to btrfs_reloc_clone_csums in cow_file_range returns an
error, we jump to the out_unlock label with the extent_reserved variable
set to false.   The cleanup at the label will then call
extent_clear_unlock_delalloc on the range from start to end.  But we've
already added cur_alloc_size to start before the jump, so there might no
range be left from the newly incremented start to end.  Move the check for
'start < end' so that it is reached by also for the !extent_reserved case.

CC: stable@vger.kernel.org # 6.1+
Fixes: a315e68f6e ("Btrfs: fix invalid attempt to free reserved space on failure to cow range")
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christoph Hellwig
2023-07-24 06:26:55 -07:00
committed by Greg Kroah-Hartman
parent 504d81c512
commit 7112abc9e8
1 changed files with 5 additions and 5 deletions
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10
fs/btrfs/inode.c
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@@ -1429,8 +1429,6 @@ out_unlock:
clear_bits,
page_ops);
start += cur_alloc_size;
if (start >= end)
return ret;
}
/*
@@ -1439,9 +1437,11 @@ out_unlock:
* space_info's bytes_may_use counter, reserved in
* btrfs_check_data_free_space().
*/
extent_clear_unlock_delalloc(inode, start, end, locked_page,
clear_bits | EXTENT_CLEAR_DATA_RESV,
page_ops);
if (start < end) {
clear_bits |= EXTENT_CLEAR_DATA_RESV;
extent_clear_unlock_delalloc(inode, start, end, locked_page,
clear_bits, page_ops);
}
return ret;
}