commit 24ae63656a165c870c0d69fcc8aac1dc35e25e34
author Yan, Zheng <zheng.z.yan@linux.intel.com> Mon Dec 06 07:02:36 2010 +0000
committer Chris Mason <chris.mason@oracle.com> Fri Dec 10 16:29:09 2010 -0500
tree 8833bfeba51ef45e0acc42f3a23838f528e6a37e
parent 84cd948cb11041f205242de457e680b9bb872a36

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>

fs/btrfs/inode.c

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index ae6c0d1..4875d69 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -495,7 +495,7 @@
 		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();