[PATCH 0/5] NFS: Client Side Directory Delegations

[Anna Schumaker <anna@kernel.org>]

From: Anna Schumaker <anna.schumaker@oracle.com>

This patchset adds support for recallable directory delegations in the
NFS client, letting us shortcut some directory revalidation steps since
we know the directory hasn't changed from underneath us.

I tried to limit requesting a dir delegation to when we think the user
is doing work within a directory, so I look for ACCESS, CREATE, UNLINK,
and (same directory) RENAME calls. I'm open to suggestions for other
times I should be requesting a dir delegation too.

Finally, I add a new "directory_delegations" module parameter for
controlling the usage of directory delegations since they are still a
new feature. I (optimistically) have them enabled by default, and
setting this option to false will disable requesting delegations and
cause the client to return any existing delegations on the next use.

I'm happy to hear any suggestions for improvements!
Anna


Anna Schumaker (5):
  NFS: Add support for sending GDD_GETATTR
  NFS: Request a directory delegation on ACCESS, CREATE, and UNLINK
  NFS: Request a directory delegation during RENAME
  NFS: Shortcut lookup revalidations if we have a directory delegation
  NFS: Add a module option to disable directory delegations

 fs/nfs/delegation.c       |   8 +++
 fs/nfs/delegation.h       |  13 +++++
 fs/nfs/dir.c              |  19 +++++++
 fs/nfs/inode.c            |   3 ++
 fs/nfs/nfs3proc.c         |   3 +-
 fs/nfs/nfs4proc.c         |  62 ++++++++++++++++++++--
 fs/nfs/nfs4xdr.c          | 106 ++++++++++++++++++++++++++++++++++++++
 fs/nfs/proc.c             |   3 +-
 fs/nfs/unlink.c           |   3 +-
 include/linux/nfs_fs.h    |   1 +
 include/linux/nfs_fs_sb.h |   1 +
 include/linux/nfs_xdr.h   |  10 +++-
 12 files changed, 223 insertions(+), 9 deletions(-)

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2.51.2