[0/4] vfs: expose the inode change attribute via statx

Message

Jeff Layton Aug. 16, 2022, 1:27 p.m. UTC

The i_version counter is currently only really visible via knfsd with
NFSv4, so testing its behavior has always been quite difficult. The main
goal of this patchset is to remedy that.

The idea is to expose i_version to userland via statx for all
filesystems that support it. The initial usecase for this is to allow
for better testing of i_version counter behavior, but it may be useful
for userland nfs servers like nfs-ganesha and possibly other situations
in the future.

I'll be posting patches for xfsprogs and xfstests that use and test this
functionality soon.

Jeff Layton (4):
  vfs: report change attribute in statx for IS_I_VERSION inodes
  nfs: report the change attribute if requested
  afs: fill out change attribute in statx replies
  ceph: fill in the change attribute in statx requests

 fs/afs/inode.c            |  2 ++
 fs/ceph/inode.c           | 14 +++++++++-----
 fs/nfs/inode.c            |  7 +++++--
 fs/stat.c                 |  7 +++++++
 include/linux/stat.h      |  1 +
 include/uapi/linux/stat.h |  3 ++-
 samples/vfs/test-statx.c  |  8 ++++++--
 7 files changed, 32 insertions(+), 10 deletions(-)