Re: [PATCH 0/2] xfs: defrag support for v5 filesystems

Ben Myers
2013-09-10T17:51:41Z

On Fri, Aug 30, 2013 at 10:23:43AM +1000, Dave Chinner wrote:
> Hi folks,
>
> The following 2 patches implement the BMBT owner change transaction
> that is necessary to enable the XFS_IOC_SWAPEXT ioctl to operate on
> v5 filesystems correctly. The first patch implements the
> transactional runtime change, and the second patch implements the
> recovery of that change.
>
> Both the run time and recovery code use the same mechanism for
> changing the owner field in all the blocks in the BMBT on an inode,
> and even though XFS_IOC_SWAPEXT only swaps the data fork, the code
> has been written to be fork neutral so if we even need to swap
> attribute forks it should just work for that, too.
>
> Further, because the BMBT code uses the generic btree
> infrastructure, the btree modification is done as a generic function
> as well and so should work for all types of btrees supported by the
> generic code. Hence if the need arises we can easily change the
> owner of any btree that uses the generic code.
>
> The testing carried out is documented in the description of the
> second patch.
>
> AFAIA, this is the only remaining feature that the kernel v5
> filesystem implementation didn't support. Hence, with this patchset,
> there are no more feature checkboxes that need to be ticked that
> would prevent us from removing the experimental tag from it. Testing
> is the only remaining gate to removing the tag from the kernel
> code...

Applied these 2.