TAKE - set inode ops in xfs_attrctl_by_handle

[Eric Sandeen <sandeen@sgi.com>]

For some reason my workstation doesn't like to send take messages...
sorry if this shows up 2x.

If we get into xfs_attrctl_by_handle from scratch, and wind up with a
brand new inode, inode->i_op->attrctl isn't getting set.  You can see
this by attrctl-ing a device special file on a filesystem, remount the
filesystem, and then xfsdump it - xfsdump will segfault because there's
no i_op->attrctl.  (Thanks to Harrison Xing.)  This didn't show up on
regular files, perhaps because xfsdump calls xfs_open_by_handle first on
it, which sets the inode ops.  Adding a call to linvfs_set_inode_ops in
xfs_attrctl_by_handle may be redundant, but it's better than never
setting it at all.  :)

Also added a sanity check for inode->i_op && inode->i_op->attrctl before
trying to do anything with it.

Date:  Fri Aug  15:49:32 PDT 2001
Workarea:  stout.americas.sgi.com:/localhome/eric/2.4.x-xfs/workarea

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


Modid:  2.4.x-xfs:slinx:100561a
linux/fs/xfs/linux/xfs_ioctl.c - 1.45
        - set inode ops in xfs_attrctl_by_handle

-- 
Eric Sandeen      XFS for Linux     http://oss.sgi.com/projects/xfs
sandeen@sgi.com   SGI, Inc.