4.9-stable patches

[thirdparty/kernel/stable-queue.git] / releases / 2.6.32.17 / 0033-ext4-allow-defrag-EXT4_IOC_MOVE_EXT-in-32bit-compat-.patch

From 9a0bd6ee7ccc0cfdc614dbc6a4708d596ec53f82 Mon Sep 17 00:00:00 2001
From: Christian Borntraeger <borntraeger@de.ibm.com>
Date: Sun, 30 May 2010 22:49:47 -0400
Subject: ext4: allow defrag (EXT4_IOC_MOVE_EXT) in 32bit compat mode

commit b684b2ee9409f2890a8b3aea98525bbe5f84e276 upstream (as of v2.6.34-git13)

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 */
};

Lets just wire up EXT4_IOC_MOVE_EXT for the compat case.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
CC: Akira Fujita <a-fujita@rs.jp.nec.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
 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;
 	}