[v8,RESEND,0/8] fs: clean up internal i_version handling

Message

Jeff Layton Jan. 24, 2023, 7:30 p.m. UTC

I had inteded to send a PR for this for v6.2, but I got sidetracked
with different issues, and didn't get it together in time. This set has
been sitting in linux-next since October, and it seems to be behaving,
so I intend to send a PR when the v6.3 merge window opens.

Though nothing has really changed since last year, I'm resending now
in the hopes I can collect a few more Reviewed-bys (ones from Al, Trond
and Anna would be particularly welcome).

The main consumer of i_version field (knfsd) has to jump through a
number of hoops to fetch it, depending on what sort of inode it is.
Rather than do this, we want to offload the responsibility for
presenting this field to the filesystem's ->getattr operation, which is
a more natural way to deal with a field that may be implemented
differently.

The focus of this patchset is to clean up these internal interfaces.
This should also make it simple to present this attribute to userland in
the future, which should be possible once the semantics are a bit more
consistent across different backing filesystems.

Thanks!

Jeff Layton (8):
  fs: uninline inode_query_iversion
  fs: clarify when the i_version counter must be updated
  vfs: plumb i_version handling into struct kstat
  nfs: report the inode version in getattr if requested
  ceph: report the inode version in getattr if requested
  nfsd: move nfsd4_change_attribute to nfsfh.c
  nfsd: use the getattr operation to fetch i_version
  nfsd: remove fetch_iversion export operation

 fs/ceph/inode.c          | 16 +++++++----
 fs/libfs.c               | 36 ++++++++++++++++++++++++
 fs/nfs/export.c          |  7 -----
 fs/nfs/inode.c           | 16 ++++++++---
 fs/nfsd/nfs4xdr.c        |  4 ++-
 fs/nfsd/nfsfh.c          | 42 ++++++++++++++++++++++++++++
 fs/nfsd/nfsfh.h          | 29 +-------------------
 fs/nfsd/vfs.h            |  7 ++++-
 fs/stat.c                | 17 ++++++++++--
 include/linux/exportfs.h |  1 -
 include/linux/iversion.h | 59 ++++++++++++++--------------------------
 include/linux/stat.h     |  9 ++++++
 12 files changed, 156 insertions(+), 87 deletions(-)