v6: add support for STATX_ATTR_VERSION_MONOTONIC
add patch to expose i_version counter to userland
patches to update times/version after copying write data
An updated set of i_version handling changes! I've dropped the earlier
ext4 patches since Ted has picked up the relevant ext4 ones.
This set is based on linux-next, to make sure we don't collide with the
statx DIO alignment patches, and some other i_version cleanups that are
in flight. I'm hoping those land in 6.1.
There are a few changes since v5, mostly centered around adding
STATX_ATTR_VERSION_MONOTONIC. I've also re-added the patch to expose
STATX_VERSION to userland via statx. What I'm proposing should now
(mostly) conform to the semantics I layed out in the manpage patch I
sent recently [1].
Finally, I've added two patches to make __generic_file_write_iter and
ext4 update the c/mtime after copying file data instead of before, which
Neil pointed out makes for better cache-coherency handling. Those should
take care of ext4 and tmpfs. xfs and btrfs will need to make the same
changes.
One thing I'm not sure of is what we should do if update_times fails
after an otherwise successful write. Should we just ignore that and move
on (and maybe WARN)? Return an error? Set a writeback error? What's the
right recourse there?
I'd like to go ahead and get the first 6 patches from this series into
linux-next fairly soon, so if anyone has objections, please speak up!
[1]: https://lore.kernel.org/linux-nfs/20220928134200.28741-1-jlayton@xxxxxxxxxx/T/#u
Jeff Layton (9):
iversion: move inode_query_iversion to libfs.c
iversion: 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: use the getattr operation to fetch i_version
vfs: expose STATX_VERSION to userland
vfs: update times after copying data in __generic_file_write_iter
ext4: update times after I/O in write codepaths
fs/ceph/inode.c | 16 +++++++++----
fs/ext4/file.c | 20 +++++++++++++---
fs/libfs.c | 36 +++++++++++++++++++++++++++++
fs/nfs/export.c | 7 ------
fs/nfs/inode.c | 10 ++++++--
fs/nfsd/nfs4xdr.c | 4 +++-
fs/nfsd/nfsfh.c | 40 ++++++++++++++++++++++++++++++++
fs/nfsd/nfsfh.h | 29 +----------------------
fs/nfsd/vfs.h | 7 +++++-
fs/stat.c | 7 ++++++
include/linux/exportfs.h | 1 -
include/linux/iversion.h | 48 ++++++++-------------------------------
include/linux/stat.h | 2 +-
include/uapi/linux/stat.h | 6 +++--
mm/filemap.c | 17 ++++++++++----
samples/vfs/test-statx.c | 8 +++++--
16 files changed, 163 insertions(+), 95 deletions(-)
--
2.37.3
