[19/90] ext4: Return exchanged blocks count to user space in failure

[Greg KH]

2.6.31-stable review patch.  If anyone has any objections, please let us know.

------------------
(cherry picked from commit 8d6669133d8cdbb7cbe0e1f0f3744e7802a84afe)

Return exchanged blocks count (moved_len) to user space,
if ext4_move_extents() failed on the way.

Signed-off-by: Akira Fujita <a-fujita@xxxxxxxxxxxxx>
Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
 fs/ext4/ioctl.c |    7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -243,10 +243,9 @@ setversion_out:
 					me.donor_start, me.len, &me.moved_len);
 		fput(donor_filp);
 
-		if (!err)
-			if (copy_to_user((struct move_extent *)arg,
-				&me, sizeof(me)))
-				return -EFAULT;
+		if (copy_to_user((struct move_extent *)arg, &me, sizeof(me)))
+			return -EFAULT;
+
 		return err;
 	}
 


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