vfs: fixes and cleanups (v3)

Changes since the last submission

  - drop patches already merged into mainline
  - Al pointed out problems with "vfs: truncate: append-only checking
    cleanup", drop it
  - re-add the security call into "fat: dont call notify_change" to be
    absolutely safe, but add comment noting this may not strictly be needed
  - small changes to "vfs: utimes cleanup", hopefully everyone will
    be happy with this

Thanks to Christoph and Al for the reviews.

The series contains the following changes:

1-7   filesystem cleanups/fixes, mainly removing vfs_* calls
8-12  vfs cleanups/fixes
13-22 add path_* helpers to check r/o bind mounts

It's against mainline and the 13-22 patches have a small conflict with
git-unionfs.patch.  They also break unionfs compilation.  Erez has a
patch for that, what are the preferred logistics for getting that into
-mm?

This series is also available from the following git tree:

  git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs.git vfs-cleanups

Thanks,
Miklos

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