Re: [PATCH v3 1/8] statx: add direct I/O alignment information

[Christoph Hellwig]

On Thu, Jun 23, 2022 at 08:58:12AM -0700, Darrick J. Wong wrote:
> Hmm.  Does the XFS port of XFS_IOC_DIOINFO to STATX_DIOALIGN look like
> this?
> 
> 	struct xfs_buftarg	*target = xfs_inode_buftarg(ip);
> 
> 	kstat.dio_mem_align = target->bt_logical_sectorsize;
> 	kstat.dio_offset_align = target->bt_logical_sectorsize;
> 	kstat.result_mask |= STATX_DIOALIGN;

Yes, I think so.  And it would be very good to include the XFS conversion
with this series as the only file systems that already supports
reporting alignment constraints.

I also suspect that lifting XFS_IOC_DIOINFO to common code by calling
->getattr would be useful because now all existing software using that
will also do the right thing on ext4 and f2fs now.