Re: [PATCH] btrfs: remove btrfs_writepage_cow_fixup

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On Tue, Jun 28, 2022 at 01:53:56PM +0200, David Sterba wrote:
> This would work only for the higher level API where eg. RDMA notifies
> the filesystem, but there's still the s390 case that is part of the
> hardware architecture. The fixup worker is there as a safety for all
> other cases, I'm not fine removing or ignoring it.

I'd really like to have a confirmation of this whole s390 theory.
s390 does treat some dirtying different than the other architectures,
but none of that should leak into the file system API if any way that
bypasses ->page_mkwrite.

Because if it did most file systems would be completely broken on
s390.




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