Preparation work for VFS based union mounts

Al,
here are some patches that are indenpendant from but necessary for the union
mount patch set. Valerie and I think they are ok to go in separately from the
rest of the patches.

Thanks,
Jan

Jan Blunck (6):
  VFS: BUG() if somebody tries to rehash an already hashed dentry
  VFS: propagate mnt_flags into do_loopback
  VFS: Make lookup_hash() return a struct path
  VFS: Remove unnecessary micro-optimization in cached_lookup()
  VFS: Make real_lookup() return a struct path
  VFS: Introduce dput() variant that maintains a kill-list

 fs/dcache.c    |  116 ++++++++++++++++++++++++++++---
 fs/namei.c     |  209 +++++++++++++++++++++++++++++++-------------------------
 fs/namespace.c |    7 +-
 3 files changed, 225 insertions(+), 107 deletions(-)

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