TAKE - ioctl permissions

[Nathan Scott <nathans@xxxxxxxxxxxxxxxxxxxxxxx>]

Fix permission checks for some ioctls.  Its now possible for ordinary
users to use the preallocation calls if unwritten extents are enabled,
and a couple of places where we were allowing operations if unwritten
extents are enabled, but shouldn't have been, have been closed up.


Date:  Sun Mar 16 18:18:19 PST 2003
Workarea:  snort.melbourne.sgi.com:/home/nathans/2.4.x-xfs

The following file(s) were checked into:
  bonnie.engr.sgi.com:/isms/slinx/2.4.x-xfs


Modid:  2.4.x-xfs:slinx:141842a
linux/fs/xfs/linux/xfs_ioctl.c - 1.88