[PATCH 0/2] NFSD: continuation of NFSD DIRECT

[Mike Snitzer <snitzer@kernel.org>]

Hi Chuck,

These patches build ontop of your recent series, here:
https://lore.kernel.org/linux-nfs/20250909190525.7214-1-cel@kernel.org/

The first sunrpc patch is carry-over from earlier iterations of my
NFSD DIRECT patchsets. I think it needed to be sure we have adequate
pages to handle expanding misaligned READ to fit in max payload. But
maybe not?

The 2nd "NFSD: Implement NFSD_IO_DIRECT for NFS WRITE" patch is a
refactored version of my earlier NFS WRITE support.  I tried to honor
the types of changes I saw in your rewrite of the NFSD_IO_DIRECT NFS
READ support. So I avoided needless maths and variables that were only
for the benefit of excessive tracepoint complexity (which I also
removed), while also establishing cleaner code that you can iterate on
further if you think something else needed. LOC isn't much smaller
but maybe you or others will see something that can be elided -- the
good news is this NFSD DIRECT WRITE code stands on its own like the
NFSD DIRECT READ does.

Not sure what NFSD DIRECT WRITE gray areas you think we need to work
through further in NFSD (but I could imagine there being room for
common Linux vfs code or other FS-specific code improvements to make
buffered vs direct safer). I know others have repeated concern but in
practice I haven't had any issues with this NFSD DIRECT WRITE
suppoort. So I welcome further discussion on what else needed.

Thanks,
Mike

Mike Snitzer (2):
  sunrpc: add an extra reserve page to svc_serv_maxpages()
  NFSD: Implement NFSD_IO_DIRECT for NFS WRITE

 fs/nfsd/debugfs.c          |   1 +
 fs/nfsd/trace.h            |   1 +
 fs/nfsd/vfs.c              | 215 ++++++++++++++++++++++++++++++++++++-
 include/linux/sunrpc/svc.h |   5 +-
 4 files changed, 216 insertions(+), 6 deletions(-)

-- 
2.44.0