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

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Message-ID: <4B94367E.9080506@garzik.org>
Date:	Sun, 07 Mar 2010 18:27:58 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	linux-ext4@...r.kernel.org
CC:	Christian Borntraeger <borntraeger@...ibm.com>,
	linux-kernel@...r.kernel.org, Akira Fujita <a-fujita@...jp.nec.com>
Subject: defrag deployment status (was Re: [PATCH] ext4: allow defrag (EXT4_IOC_MOVE_EXT)
 in 32bit compat mode)

On 03/07/2010 03:32 PM, 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>

I'm curious, what is the overall deployment status of ext4 defragging? 
I actually worked on this problem years ago[1], and am hopeful that I 
will see defragging in a Linux distribution sometime in my lifetime!  ;-)

Looking at Fedora rawhide, I do not see anything resembling e4defrag in 
any of the RPM packages like e2fsprogs.

Thanks to everyone working on this,

	Jeff




[1] http://linux.yyz.us/misc/ext2meta.c

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