linux-ext4 - [PATCH 2.6.33.y 21/40] ext4: allow defrag (EXT4_IOC_MOVE

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Message-Id: <1275393807-14369-21-git-send-email-tytso@mit.edu>
Date:	Tue,  1 Jun 2010 08:03:08 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	stable@...r.kernel.org
Cc:	Ext4 Developers List <linux-ext4@...r.kernel.org>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	"Theodore Ts'o" <tytso@....edu>,
	Akira Fujita <a-fujita@...jp.nec.com>
Subject: [PATCH 2.6.33.y 21/40] ext4: allow defrag (EXT4_IOC_MOVE_EXT) in 32bit compat mode

From: Christian Borntraeger <borntraeger@...ibm.com>

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>
---
 fs/ext4/ioctl.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 016d024..66fa0b0 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -375,6 +375,8 @@ long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 		break;
 	case EXT4_IOC_GROUP_ADD:
 		break;
+	case EXT4_IOC_MOVE_EXT:
+		break;
 	default:
 		return -ENOIOCTLCMD;
 	}
-- 
1.6.6.1.1.g974db.dirty

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