xfs: update for 3.11-rc1

- part of the work to allow project quotas and group quotas to
  be used together
- inode change count
- inode create transaction
- block queue plugging in buffer readahead and bulkstat
- ordered log vector support
- removal of dead code in and around xfs_sync_inode_grab,
  xfs_ialloc_get_rec, XFS_MOUNT_RETERR, XFS_ALLOCFREE_LOG_RES,
  XFS_DIROP_LOG_RES, xfs_chash, ctl_table, and xfs_growfs_data_private
- don't keep silent if sunit/swidth can not be changed via mount
- fix a leak of remote symlink blocks into the filesystem when
  xattrs are used on symlinks
- fix for fiemap to return FIEMAP_EXTENT_UNKOWN flag on delay extents
- part of a fix for xfs_fsr
- disable speculative preallocation with small files
- performance improvements for inode creates and deletes
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