[GIT PULL afs: Development for 5.4

[David Howells]

Hi Linus,

Here's a set of patches for AFS.  The first three are trivial, deleting
unused symbols and rolling out a wrapper function.

The fourth and fifth patches make use of the previously added RCU-safe
request_key facility to allow afs_permission() and afs_d_revalidate() to
attempt to operate without dropping out of RCU-mode pathwalk.  Under
certain conditions, such as conflict with another client, we still have to
drop out anyway, take a lock and consult the server.

David
---
The following changes since commit f16180739cd18a39a1a45516ac0e65d18a9f100e:

  Merge remote-tracking branch 'net/master' into afs-next (2019-09-02 11:43:44 +0100)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git tags/afs-next-20190915

for you to fetch changes up to a0753c29004f4983e303abce019f29e183b1ee48:

  afs: Support RCU pathwalk (2019-09-02 11:43:54 +0100)

----------------------------------------------------------------
AFS development

Tested-by: Marc Dionne <marc.dionne@xxxxxxxxxxxx>

----------------------------------------------------------------
David Howells (3):
      afs: Use afs_extract_discard() rather than iov_iter_discard()
      afs: Provide an RCU-capable key lookup
      afs: Support RCU pathwalk

YueHaibing (2):
      afs: remove unused variable 'afs_voltypes'
      afs: remove unused variable 'afs_zero_fid'

 fs/afs/dir.c        |  54 +++++++++++++++++++++++++-
 fs/afs/fsclient.c   |   6 +--
 fs/afs/internal.h   |   1 +
 fs/afs/security.c   | 108 +++++++++++++++++++++++++++++++++++++++++++---------
 fs/afs/volume.c     |   2 -
 fs/afs/yfsclient.c  |   6 +--
 include/linux/key.h |  14 ++++++-
 7 files changed, 162 insertions(+), 29 deletions(-)