[git pull] vfs.git more namei.c stuff

[Al Viro]

        Small namei.c patch series, mostly to simplify the rules
for nameidata state.  It's in #work.namei and it's actually from
the previous cycle - didn't post it for review in time...

	Changes visible outside of fs/namei.c: file_open_root()
calling conventions change, some freed bits in LOOKUP_... space.

The following changes since commit 4f0ed93fb92d3528c73c80317509df3f800a222b:

  LOOKUP_MOUNTPOINT: we are cleaning "jumped" flag too late (2021-04-06 20:33:00 -0400)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git work.namei

for you to fetch changes up to 7962c7d196e36aa597fadb78c1cb4fe7e209f803:

  namei: make sure nd->depth is always valid (2021-04-07 13:57:17 -0400)

----------------------------------------------------------------
Al Viro (4):
      switch file_open_root() to struct path
      take LOOKUP_{ROOT,ROOT_GRABBED,JUMPED} out of LOOKUP_... space
      teach set_nameidata() to handle setting the root as well
      namei: make sure nd->depth is always valid

 Documentation/filesystems/path-lookup.rst |  6 +--
 Documentation/filesystems/porting.rst     |  9 ++++
 arch/um/drivers/mconsole_kern.c           |  2 +-
 fs/coredump.c                             |  4 +-
 fs/fhandle.c                              |  2 +-
 fs/internal.h                             |  2 +-
 fs/kernel_read_file.c                     |  2 +-
 fs/namei.c                                | 80 +++++++++++++++++--------------
 fs/nfs/nfstrace.h                         |  4 --
 fs/open.c                                 |  4 +-
 fs/proc/proc_sysctl.c                     |  2 +-
 include/linux/fs.h                        |  8 +++-
 include/linux/namei.h                     |  3 --
 kernel/usermode_driver.c                  |  2 +-
 14 files changed, 74 insertions(+), 56 deletions(-)