RFC: remove the if_flags field in struct xfs_ifork

[Christoph Hellwig <hch@lst.de>]

Hi all,

given how much confusion the ifork flags cause I thought we'd better
off just removing them as all the information is available from other
fields in the ifork structure anyway.

Only very lightly tested so far and thus for conceptual review.  It will
need a rebase of the attr initialization fixes anyway.

Diffstat:
 libxfs/xfs_attr.c          |   53 ++++++++++------
 libxfs/xfs_attr.h          |    1 
 libxfs/xfs_attr_leaf.c     |   13 +---
 libxfs/xfs_bmap.c          |  141 +++++++++++++--------------------------------
 libxfs/xfs_bmap.h          |    1 
 libxfs/xfs_btree_staging.c |    1 
 libxfs/xfs_dir2_block.c    |    2 
 libxfs/xfs_dir2_sf.c       |   12 +--
 libxfs/xfs_inode_fork.c    |   22 +------
 libxfs/xfs_inode_fork.h    |   14 +---
 scrub/bmap.c               |   15 +---
 scrub/symlink.c            |    2 
 xfs_aops.c                 |    3 
 xfs_attr_list.c            |    2 
 xfs_bmap_util.c            |   20 ++----
 xfs_dir2_readdir.c         |   10 +--
 xfs_dquot.c                |    8 --
 xfs_inode.c                |    9 --
 xfs_ioctl.c                |    2 
 xfs_iomap.c                |   20 ++----
 xfs_iops.c                 |    4 -
 xfs_qm.c                   |    8 --
 xfs_reflink.c              |    8 --
 xfs_symlink.c              |    6 -
 24 files changed, 141 insertions(+), 236 deletions(-)