RE: [PATCH 2/3] xfs: Add support IOC_MOV_DATA ioctl

On Wed, 09 Jul 2014 15:33:21 +0900, Namjae Jeon [off-list ref] wrote:

quoted

On Tue, Jul 08, 2014 at 08:59:49PM +0900, Namjae Jeon wrote:

quoted

This patch implements fs ioctl's IOC_MOV_DATA for XFS.

Shouldn't this share code with the XFS_IOC_SWAPEXT implementation?

Lukas has raised the same question for ext4.
Both xfs(XFS_IOC_SWAPEXT) and ext4(EXT4_IOC_MOVE_EXT) has ioctls which uses
almost similar kind of structure as struct mov_data.
As such, there seems to be possiblity for sharing basic code (I will try)
used for sanity checking in IOC_MOV_DATA to be shared with these ioctls
but the core functionality code will remain different.

Thanks!

Actually they are differ. EXT4_IOC_MOVE_EXT copy data inside kernel,
but XFS_IOC_SWAPEXT live this job to userpsace see:
http://oss.sgi.com/cgi-bin/gitweb.cgi?p=xfs/cmds/xfsprogs.git;a=blob;f=fsr/xfs_fsr.c packfile
And I'll vote to make EXT4_IOC_MOVE_EXT deprecated, and implement EXT4_IOC_SWAPEXT
as XFS does that.
Ted, Lukas what do you think about that?

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