vfs: mountinfo (v3)

Here's an updated mountinfo patch with the following changes relative
to the last submission (the one currently in -mm):

 - in __d_path() don't add extra parameter for checking unreachable path
 - reduce proliferation of #ifdef CONFIG_PROC_FS into dcache.c and seq_file.c
 - make peer group ID allocation a separate pass from setting mount shared
 - change order and format of fields in /proc/<pid>/mountinfo
 - remove dubious cleanups
 - consolidate locking: don't use vfsmount_lock where namespace_sem suffices
 - patch history was getting tangled up, merge and resplit into logical chunks

This series is also available here:

  git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs.git mountinfo

I guess the simplest for all involved parties would be if this went
into Al's tree (if it looks OK) and then Andrew can suck that tree (*)
containing all sort of goodies into -mm.

(*) git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6.git vfs-2.6.25

Thanks,
Miklos

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