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

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Message-ID: <4B94B892.8000209@rs.jp.nec.com>
Date:	Mon, 08 Mar 2010 17:42:58 +0900
From:	Akira Fujita <a-fujita@...jp.nec.com>
To:	Christian Borntraeger <borntraeger@...ibm.com>
CC:	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ext4: allow defrag (EXT4_IOC_MOVE_EXT) in 32bit compat
 mode


Hi Christian,

(2010/03/08 5:32), Christian Borntraeger wrote:
> 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;
>   	}

Looks good for me.
Thank you for your work.

Regards,
Akira Fujita


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