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btrfs: fix wrong file range cleanup after an error filling dealloc range

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commit e2c8e92d1140754073ad3799eb6620c76bab2078 upstream.

If an error happens while running dellaloc in COW mode for a range, we can
end up calling extent_clear_unlock_delalloc() for a range that goes beyond
our range's end offset by 1 byte, which affects 1 extra page. This results
in clearing bits and doing page operations (such as a page unlock) outside
our target range.

Fix that by calling extent_clear_unlock_delalloc() with an inclusive end
offset, instead of an exclusive end offset, at cow_file_range().

Fixes: a315e68f6e ("Btrfs: fix invalid attempt to free reserved space on failure to cow range")
CC: stable@vger.kernel.org # 4.14+
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Filipe Manana 2020-05-27 11:15:53 +01:00 • committed by Greg Kroah-Hartman
commit 8076bdd4fe
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/inode.c
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@ -1132,7 +1132,7 @@ out_unlock:
*/
if (extent_reserved) {
extent_clear_unlock_delalloc(inode, start,
start + cur_alloc_size,
start + cur_alloc_size - 1,
locked_page,
clear_bits,
page_ops);