[PATCH 0/5 V2] xfs: sanitise superblock feature bit support

[Dave Chinner]

Hi folks,

This is a followup series that addresses the review comments made
for this version:

http://oss.sgi.com/pipermail/xfs/2014-May/036025.html

The main change is to the NLINK/inode version handling (patch 3)
where xfs_iread() now unconditionally converts inodes to v2 format
in memory, so that if they are logged and written back they always
get converted to v2 format. This means there is no more bumping of
inode versions when link counts change, and xfs_iflush_int() no
longer writes v1 inodes at all.

Comments, testing, etc all welcome.

Version 2:
- rework inode version handling
- remove fetaure bit template comment in xfs_sb.h