Re: [PATCH v6 4/7] xfs: Support FS_XFLAG_ATOMICWRITES

[John Garry]

On 01/10/2024 09:41, Christoph Hellwig wrote:
> On Mon, Sep 30, 2024 at 09:03:49AM -0700, Darrick J. Wong wrote:
> > If we're only allowing atomic writes that are 1 fsblock or less, then
> > copy on write will work correctly because CoWs are always done with
> > fsblock granularity.  The ioend remap is also committed atomically.
> >
> > IOWs, it's forcealign that isn't compatible with reflink and you can
> > drop this incompatibility.
> That was my thought as well when reading through this patch.

ok, fine. I just thought that we don't want to mix reflinked files and 
atomic writes at all. I do understand that there was also an 
incompatibility between forcealign and reflink.

Cheers,
John