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

From: Jeff Garzik
Date: Sun Mar 07 2010 - 18:52:20 EST

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@xxxxxxxxxx>
CCed: Akira Fujita<a-fujita@xxxxxxxxxxxxx>

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,



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