Btrfs: fix clone ioctl where range is adjacent to extent

We had an edge case issue where the requested range was just
following an existing extent. Instead of skipping to the next
extent, we used the previous one which lead to having zero
sized extents.

Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index d94bef5179fceac61073ba350d72b0b5165118aa..3fe15e435b5cbc5a541718be67f05bebd55ed759 100644 (file)
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1597,7 +1597,7 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
                        }
                        btrfs_release_path(root, path);
 
-                       if (key.offset + datal < off ||
+                       if (key.offset + datal <= off ||
                            key.offset >= off+len)
                                goto next;