vfs-scale git tree update

Git tree is here:
  
  git://git.kernel.org/pub/scm/linux/kernel/git/npiggin/linux-npiggin.git
  
Branch is: vfs-scale-working

Head is: b3e19d924b6eaf2ca7d22cba99a517c5171007b6

Changes since last posting:
* Implemented Linus' suggestions:
  - Switch the filesystem methods in one hit rather than having _rcu
    variants. This avoids a lot of cruft from core code.
  - Implement filesystem rcu-walk aware conversions in seperate patches
    after the APIs are changed, making bisectability better.
  - Change dentry_memcmp to dentry_cmp
  - Rework the way ->d_revalidate is handled to be simpler.

* Fixed configfs bug caused by switching d_op on live dentry.

* Leave d_revalidate filesystem changes out for now. The sysfs one
  in particular seems to have been causing a funny regression.

* Bit more tweaking of changelogs documentation and comments.

* Passes ltp, xfstests, dbench stressing over nfs, and some of my own
  racer tests on a couple of filesystems. Needs wider testing.

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