VFS prep for union mounts/writable overlays

Writable overlays/union mounts requires some generic VFS improvements
and changes.  The patches in this set are independent of union
mounts and should merged immediately.

Jan Blunck (6):
  autofs4: Save autofs trigger's vfsmount in super block info
  VFS: Make lookup_hash() return a struct path
  VFS: Make real_lookup() return a struct path
  VFS: Propagate mnt_flags into do_loopback
  VFS: BUG_ON() rehash of an already hashed dentry
  VFS: Remove unnecessary micro-optimization in cached_lookup()

Valerie Aurora (1):
  VFS: Add read-only users count to superblock

 fs/autofs4/autofs_i.h |    1 +
 fs/autofs4/init.c     |   11 +++-
 fs/autofs4/root.c     |    6 ++
 fs/dcache.c           |    1 +
 fs/namei.c            |  217 ++++++++++++++++++++++++++-----------------------
 fs/namespace.c        |    7 +-
 fs/super.c            |   18 ++++-
 include/linux/fs.h    |    5 +
 8 files changed, 158 insertions(+), 108 deletions(-)

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