[PATCH resend] ext4: allow defrag (EXT4_IOC_MOVE_EXT) in 32bit compat mode

[Christian Borntraeger]

Ted, can you consider this patch for ext4?

From: Christian Borntraeger <borntraeger@xxxxxxxxxx>

I have an x86_64 kernel with i386 userspace. e4defrag fails on the
EXT4_IOC_MOVE_EXT ioctl because it is not wired up for the compat
case. It seems that 
struct move_extent is compat save, only types with fixed widths are used.
{
        __u32 reserved;         /* should be zero */
        __u32 donor_fd;         /* donor file descriptor */
        __u64 orig_start;       /* logical start offset in block for orig */
        __u64 donor_start;      /* logical start offset in block for donor */
        __u64 len;              /* block length to be moved */
        __u64 moved_len;        /* moved block length */
};


Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Reviewed-by: Eric Sandeen <sandeen@xxxxxxxxxx>
Acked-by: Akira Fujita <a-fujita@xxxxxxxxxxxxx> 

---
 fs/ext4/ioctl.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -375,6 +375,8 @@ long ext4_compat_ioctl(struct file *file
 		break;
 	case EXT4_IOC_GROUP_ADD:
 		break;
+	case EXT4_IOC_MOVE_EXT:
+		break;
 	default:
 		return -ENOIOCTLCMD;
 	}

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