[PATCH] NFS: Add support for NFSv3 ACLs

[PATCH] NFS: Add support for NFSv3 ACLs

 This adds acl support fo nfs clients via the NFSACL protocol extension, by
 implementing the getxattr, listxattr, setxattr, and removexattr iops for the
 system.posix_acl_access and system.posix_acl_default attributes.  This patch
 implements a dumb version that uses no caching (and thus adds some overhead).
 (Another patch in this patchset adds caching as well.)

 Signed-off-by: Andreas Gruenbacher <[email protected]>
 Acked-by: Olaf Kirch <[email protected]>
 Signed-off-by: Andrew Morton <[email protected]>
 Signed-off-by: Trond Myklebust <[email protected]>