New ACL format for better NFSv4 acl interoperability

Hi,

The following set of patches implements VFS and ext4 changes needed to implement
a new acl model for linux. Rich ACLs are an implementation of NFSv4 ACLs,
extended by file masks to fit into the standard POSIX file permission model.
They are designed to work seamlessly locally as well as across the NFSv4 and
CIFS/SMB2 network file system protocols.

A user-space utility for displaying and changing richacls is available at [4]
(a number of examples can be found at http://acl.bestbits.at/richacl/examples.html).

[4] git://git.kernel.org/pub/scm/fs/acl/kvaneesh/richacl.git master

To test richacl on ext4 use -o richacl mount option. This mount option may later be
dropped in favour of a feature flag.

More details regarding richacl can be found at
http://acl.bestbits.at/richacl/

Changes from v5:
a) rebase to v3.1-rc4-131-g9e79e3e

NOTE: The kernel changes will be pushed to
git://git.kernel.org/pub/scm/linux/kernel/git/kvaneesh/linux-richacl.git richacl
when kernel.org is back

-aneesh

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