RFC Patch series to fix autofs unreliable usage of d_mountpoint()

This series fixes the potential problem of autofs returning ELOOP when a mount exists in a propogation private mount namespace other than the namespace in which the mount is to be performed.

I'm posting the series as an RFC in the hope of catching stupid mistakes that I may have made before submitting to mmotm. Please note the series here is against the current Linus tree and may be slightly different when posted for inclusion in mmotm.

Please review and post any comments.
---

Ian Kent (8):
vfs - change d_manage() to take a struct path
vfs - add path_is_mountpoint() helper
vfs - add path_has_submounts()
autofs - change autofs4_expire_wait() to take struct path autofs - change autofs4_wait() to take struct path
autofs - use path_is_mountpoint() to fix unreliable d_mountpoint() checks autofs - use path_has_submounts() to fix unreliable have_submount() checks vfs - remove unused have_submounts() function

 Documentation/filesystems/Locking |    2 +
 Documentation/filesystems/vfs.txt |    2 +
 fs/autofs4/autofs_i.h             |    4 +-
 fs/autofs4/dev-ioctl.c            |    4 +-
 fs/autofs4/expire.c               |    8 +++-
 fs/autofs4/root.c                 |   71 +++++++++++++++++++++----------------
 fs/autofs4/waitq.c                |   13 +++++--
 fs/dcache.c                       |   36 ++++++++++---------
 fs/namei.c                        |   13 +++----
 fs/namespace.c                    |   43 ++++++++++++++++++++++
 include/linux/dcache.h            |    4 +-
 include/linux/fs.h                |    2 +
 12 files changed, 133 insertions(+), 69 deletions(-)

--
Ian