defrag deployment status (was Re: [PATCH] ext4: allow defrag (EXT4_IOC_MOVE_EXT) in 32bit compat mode)

[Jeff Garzik <jeff@garzik.org>]

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@de.ibm.com>
> CCed: Akira Fujita<a-fujita@rs.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