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

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[ Upstream commit e2c8e92d11 ]

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: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Filipe Manana 2020-05-27 11:15:53 +01:00 committed by Greg Kroah-Hartman
parent 74bee8344b
commit 789555b22b
1 changed files with 2 additions and 2 deletions
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4
fs/btrfs/inode.c
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@ -1136,8 +1136,8 @@ static noinline int cow_file_range(struct inode *inode,
*/
if (extent_reserved) {
extent_clear_unlock_delalloc(inode, start,
start + cur_alloc_size,
start + cur_alloc_size,
start + cur_alloc_size - 1,
start + cur_alloc_size - 1,
locked_page,
clear_bits,
page_ops);