linux-kernel - [113/165] ext4: allow defrag (EXT4_IOC_MOVE

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Message-Id: <20100730171509.855043933@clark.site>
Date:	Fri, 30 Jul 2010 10:15:41 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Christian Borntraeger <borntraeger@...ibm.com>,
	"Theodore Tso" <tytso@....edu>,
	Akira Fujita <a-fujita@...jp.nec.com>
Subject: [113/165] ext4: allow defrag (EXT4_IOC_MOVE_EXT) in 32bit compat mode

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

------------------

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@...ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@....edu>
Reviewed-by: Eric Sandeen <sandeen@...hat.com>
CC: Akira Fujita <a-fujita@...jp.nec.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.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;
 	}


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