Merge git://oss.sgi.com:8090/xfs/xfs-2.6

Merge git://oss.sgi.com:8090/xfs/xfs-2.6

* git://oss.sgi.com:8090/xfs/xfs-2.6:
  [XFS] Add lockdep support for XFS
  [XFS] Fix race in xfs_write() b/w dmapi callout and direct I/O checks.
  [XFS] Get rid of redundant "required" in msg.
  [XFS] Export via a function xfs_buftarg_list for use by kdb/xfsidbg.
  [XFS] Remove unused ilen variable and references.
  [XFS] Fix to prevent the notorious 'NULL files' problem after a crash.
  [XFS] Fix race condition in xfs_write().
  [XFS] Fix uquota and oquota enforcement problems.
  [XFS] propogate return codes from flush routines
  [XFS] Fix quotaon syscall failures for group enforcement requests.
  [XFS] Invalidate quotacheck when mounting without a quota type.
  [XFS] reducing the number of random number functions.
  [XFS] remove more misc. unused args
  [XFS] the "aendp" arg to xfs_dir2_data_freescan is always NULL, remove it.
  [XFS] The last argument "lsn" of xfs_trans_commit() is always called with