Btrfs: fix wrong return value of btrfs_truncate_page()

ret variant may be set to 0 if we read page successfully, but it might be
released before we lock it again. On this case, if we fail to allocate a
new page, we will return 0, it is wrong, fix it.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index bf609581c5d0..0446cbe8bcaf 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -3521,11 +3521,11 @@ int btrfs_truncate_page(struct inode *inode, loff_t from, loff_t len,
         if (ret)
                 goto out;
 
-        ret = -ENOMEM;
 again:
         page = find_or_create_page(mapping, index, mask);
         if (!page) {
                 btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE);
+                ret = -ENOMEM;
                 goto out;
         }
 
@@ -3574,7 +3574,6 @@ again:
                 goto out_unlock;
         }
 
-        ret = 0;
         if (offset != PAGE_CACHE_SIZE) {
                 if (!len)
                         len = PAGE_CACHE_SIZE - offset;