[PATCH v2 00/19] OPEN optimisations and Attribute delegations

[trondmy@kernel.org]

From: Trond Myklebust <trond.myklebust@hammerspace.com>

Now that https://datatracker.ietf.org/doc/draft-ietf-nfsv4-delstid/ is
mostly done with the review process, it is time to look at pushing the
client implementation that we've been working on upstream.

The following patch series therefore adds support for the NFSv4.2
extension to OP_OPEN to allow the client to request that the server
return either an open stateid or a delegation instead of always sending
the open stateid whether or not a delegation is returned.
This allows us to optimise away CLOSE, and hence makes small or cached
file access significantly more efficient.

It also adds support for attribute delegations, which allow the client
to manage the atime and mtime, and simply inform the server at file
close time what the values should be. This means that most GETATTR
operations to retrieve the atime/mtime values while the file is under
I/O can be optimised away.

Finally, we also add support for the detection mechanism that allows the
client to determine whether or not the server supports the above
functionality.

v2:
 - Fix issues when compiling without CONFIG_NFS_V4
 - Update "NFSv4: Fix up delegated attributes in nfs_setattr" to fix
   regressions pointed out by Anna Schumaker
 - Squash commits "NFSv4: Ask for a delegation or an open stateid in
   OPEN" and "Return the delegation when deleting the sillyrenamed file"
   as suggested by Jeff Layton
 - Add "NFSv4: Don't send delegation-related share access modes to
   CLOSE"

Lance Shelton (1):
  Return the delegation when deleting sillyrenamed files

Trond Myklebust (18):
  NFSv4: Clean up open delegation return structure
  NFSv4: Refactor nfs4_opendata_check_deleg()
  NFSv4: Add new attribute delegation definitions
  NFSv4: Plumb in XDR support for the new delegation-only setattr op
  NFSv4: Add CB_GETATTR support for delegated attributes
  NFSv4: Add a flags argument to the 'have_delegation' callback
  NFSv4: Add support for delegated atime and mtime attributes
  NFSv4: Add recovery of attribute delegations
  NFSv4: Add a capability for delegated attributes
  NFSv4: Enable attribute delegations
  NFSv4: Delegreturn must set m/atime when they are delegated
  NFSv4: Fix up delegated attributes in nfs_setattr
  NFSv4: Don't request atime/mtime/size if they are delegated to us
  NFSv4: Add support for the FATTR4_OPEN_ARGUMENTS attribute
  NFSv4: Detect support for OPEN4_SHARE_ACCESS_WANT_OPEN_XOR_DELEGATION
  NFSv4: Add support for OPEN4_RESULT_NO_OPEN_STATEID
  NFSv4: Ask for a delegation or an open stateid in OPEN
  NFSv4: Don't send delegation-related share access modes to CLOSE

 fs/nfs/callback.h         |   5 +-
 fs/nfs/callback_proc.c    |  14 ++-
 fs/nfs/callback_xdr.c     |  39 +++++-
 fs/nfs/delegation.c       |  67 ++++++----
 fs/nfs/delegation.h       |  45 ++++++-
 fs/nfs/dir.c              |   2 +-
 fs/nfs/file.c             |   4 +-
 fs/nfs/inode.c            |  86 +++++++++++--
 fs/nfs/nfs3proc.c         |  10 +-
 fs/nfs/nfs4proc.c         | 248 ++++++++++++++++++++++++++++----------
 fs/nfs/nfs4xdr.c          | 131 +++++++++++++++-----
 fs/nfs/proc.c             |  10 +-
 fs/nfs/read.c             |   3 +
 fs/nfs/unlink.c           |   2 +
 fs/nfs/write.c            |  11 +-
 include/linux/nfs4.h      |  11 ++
 include/linux/nfs_fs_sb.h |   2 +
 include/linux/nfs_xdr.h   |  45 ++++++-
 include/uapi/linux/nfs4.h |   4 +
 19 files changed, 589 insertions(+), 150 deletions(-)

-- 
2.45.2