[PATCH v6 0/5] NFSD: Implement NFSD_IO_DIRECT for NFS WRITE

[Chuck Lever <cel@kernel.org>]

From: Chuck Lever <chuck.lever@oracle.com>

Following on https://lore.kernel.org/linux-nfs/aPAci7O_XK1ljaum@kernel.org/
this series includes the patches needed to make NFSD Direct WRITE
work.

The "large" piece of work left to do:
> > > Wouldn't it make sense to track the alignment when building the bio_vec
> > > array instead of doing another walk here touching all cache lines?
> > 
> > Yes, that is the conventional wisdom that justified Keith removing
> > iov_iter_aligned.  But for NFSD's WRITE payload the bio_vec is built
> > outside of the fs/nfsd/vfs.c code.  Could be there is a natural way to
> > clean this up (to make the sunrpc layer to conditionally care about
> > alignment) but I didn't confront that yet.
> 
> Well, for the block code it's also build outside the layer consuming it.
> But Keith showed that you can easily communicate that information and
> avoid extra loops touching the cache lines.

Changes since v5:
* Add a patch to make FILE_SYNC WRITEs persist timestamps
* Address some of Christoph's review comments

Changes since v4:
* Split out refactoring nfsd_buffered_write() into a separate patch
* Expand patch description of 1/4
* Don't set IOCB_SYNC flag

Changes since v3:
* Address checkpatch.pl nits in 2/3
* Add an untested patch to mark ingress RDMA Read chunks

Chuck Lever (3):
  NFSD: Make FILE_SYNC WRITEs comply with spec
  NFSD: Enable return of an updated stable_how to NFS clients
  svcrdma: Mark Read chunks

Mike Snitzer (2):
  NFSD: Refactor nfsd_vfs_write()
  NFSD: Implement NFSD_IO_DIRECT for NFS WRITE

 fs/nfsd/debugfs.c                       |   1 +
 fs/nfsd/nfs3proc.c                      |   2 +-
 fs/nfsd/nfs4proc.c                      |   2 +-
 fs/nfsd/nfsproc.c                       |   3 +-
 fs/nfsd/trace.h                         |   1 +
 fs/nfsd/vfs.c                           | 219 ++++++++++++++++++++++--
 fs/nfsd/vfs.h                           |   6 +-
 fs/nfsd/xdr3.h                          |   2 +-
 net/sunrpc/xprtrdma/svc_rdma_recvfrom.c |   5 +
 9 files changed, 224 insertions(+), 17 deletions(-)

-- 
2.51.0