[GIT PULL] NFS LOCALIO O_DIRECT changes for Linux 6.18

[Mike Snitzer <snitzer@kernel.org>]

Hi Anna,

Given that my NFS LOCALIO O_DIRECT changes depend on NFSD changes
which will be included in the NFSD pull request for 6.18, I figured it
worth proposing a post-NFSD-merge pull request for your consideration
as the best way forward logistically (to ensure linux-next coverage,
you could pull this in _before_ Chuck sends his pull to Linus).

If you were to pull this into your NFS tree it'd bring with it Chuck's
nfsd-next (commit db155b7c7c85b5 as of now) followed by my dependant
NFS LOCALIO O_DIRECT changes.

You'll note that I folded 3 commits from Chuck's current nfsd-testing
branch into a single "NFSD: filecache: add STATX_DIOALIGN and
STATX_DIO_READ_ALIGN support", the commits from cel/nfsd-testing are:

 9cc8512712b11 NFSD: filecache: add STATX_DIOALIGN and STATX_DIO_READ_ALIGN support
 e5107ff95c56d NFSD: Prevent a NULL pointer dereference in fh_getattr()
 ed7edd1976c04 NFSD: Ignore vfs_getattr() failure in nfsd_file_get_dio_attrs()

The header for "NFSD: filecache: add STATX_DIOALIGN and
STATX_DIO_READ_ALIGN support" was updated to combine all headers. A
bit overkill but I opted for preserving full context on the evolution
of the code while folding Chuck's helpful fixes to my original commit.

The following changes since commit db155b7c7c85b5f14edec21e164001a168581ffb:

  NFSD: Disallow layoutget during grace period (2025-09-25 10:01:24 -0400)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/snitzer/linux.git tags/for-6.18/NFS-LOCALIO-DIO-post-NFSD-merge

for you to fetch changes up to 40cdfedf0aabf3b96c4cb337fdd316b4a2332905:

  NFS: add basic STATX_DIOALIGN and STATX_DIO_READ_ALIGN support (2025-09-30 11:42:36 -0400)

Please pull if you agree this works best, thanks.
Mike

ps. I know you've been looking at all this, but it is late, 6.18 merge
window is open, etc.  Just being pragmatic by acknowledging the
awkward sequence needed to get these NFS LOCALIO changes to land. If
you'd like to skin the cat a different way, that's fine.

----------------------------------------------------------------
NFS LOCALIO O_DIRECT changes that depend on various 6.18 NFSD changes,
culminating with: "NFSD: filecache: add STATX_DIOALIGN and
STATX_DIO_READ_ALIGN support".

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----------------------------------------------------------------
Mike Snitzer (8):
      NFSD: filecache: add STATX_DIOALIGN and STATX_DIO_READ_ALIGN support
      nfs/localio: make trace_nfs_local_open_fh more useful
      nfs/localio: avoid issuing misaligned IO using O_DIRECT
      nfs/localio: refactor iocb and iov_iter_bvec initialization
      nfs/localio: refactor iocb initialization
      nfs/localio: add proper O_DIRECT support for READ and WRITE
      nfs/localio: add tracepoints for misaligned DIO READ and WRITE support
      NFS: add basic STATX_DIOALIGN and STATX_DIO_READ_ALIGN support

 fs/nfs/inode.c             |  15 ++
 fs/nfs/internal.h          |  10 ++
 fs/nfs/localio.c           | 404 ++++++++++++++++++++++++++++++++++-----------
 fs/nfs/nfs2xdr.c           |   2 +-
 fs/nfs/nfs3xdr.c           |   2 +-
 fs/nfs/nfstrace.h          |  76 ++++++++-
 fs/nfsd/filecache.c        |  33 ++++
 fs/nfsd/filecache.h        |   4 +
 fs/nfsd/localio.c          |  11 ++
 fs/nfsd/nfsfh.c            |   3 +
 fs/nfsd/trace.h            |  27 +++
 include/linux/nfslocalio.h |   2 +
 include/trace/misc/fs.h    |  22 +++
 13 files changed, 512 insertions(+), 99 deletions(-)