Btrfs: Fix page leak in compressed writeback path

"start + num_bytes >= actual_end" can happen when compressed page writeback races
with file truncation. In that case we need unlock and release pages past the end
of file.

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Yan, Zheng 2010-12-06 07:02:36 +00:00 committed by Chris Mason
parent 84cd948cb1
commit 24ae63656a

View File

@ -495,7 +495,7 @@ static noinline int compress_file_range(struct inode *inode,
add_async_extent(async_cow, start, num_bytes,
total_compressed, pages, nr_pages_ret);
if (start + num_bytes < end && start + num_bytes < actual_end) {
if (start + num_bytes < end) {
start += num_bytes;
pages = NULL;
cond_resched();