linux-kernel - [PATCH] ext4: allow defrag (EXT4_IOC_MOVE

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Message-Id: <201003072132.10579.borntraeger@de.ibm.com>
Date:	Sun, 7 Mar 2010 21:32:10 +0100
From:	Christian Borntraeger <borntraeger@...ibm.com>
To:	linux-ext4@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Akira Fujita <a-fujita@...jp.nec.com>
Subject: [PATCH] ext4: allow defrag (EXT4_IOC_MOVE_EXT) in 32bit compat mode

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>
CCed: Akira Fujita <a-fujita@...jp.nec.com> 

---
 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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