1 files changed, 6 insertions, 3 deletions

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 15a09cb156ce..7af1abda68d0 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -2682,9 +2682,12 @@ static long btrfs_fallocate(struct file *file, int mode,
                 return ret;
 
         inode_lock(inode);
-        ret = inode_newsize_ok(inode, alloc_end);
-        if (ret)
-                goto out;
+
+        if (!(mode & FALLOC_FL_KEEP_SIZE) && offset + len > inode->i_size) {
+                ret = inode_newsize_ok(inode, offset + len);
+                if (ret)
+                        goto out;
+        }
 
         /*
          * TODO: Move these two operations after we have checked