TAKE 932297 - fix dirsync mount option

[Nathan Scott <nathans@xxxxxxxxxxxxxxxxxxxxxxx>]

Make trivial extension to sync flag to implement dirsync,
instead of silently ignoring it.

Date:  Mon Mar 21 12:14:39 AEDT 2005
Workarea:  chook.melbourne.sgi.com:/build/nathans/xfs-linux
Inspected by:  dgc@xxxxxxx

The following file(s) were checked into:
  longdrop.melbourne.sgi.com:/isms/xfs-kern/xfs-linux-melb


Modid:  xfs-linux-melb:xfs-kern:21888a
xfs_vnodeops.c - 1.640
http://oss.sgi.com/cgi-bin/cvsweb.cgi/xfs-linux/xfs_vnodeops.c.diff?r1=text&tr1=1.640&r2=text&tr2=1.639&f=h
xfs_vfsops.c - 1.464
http://oss.sgi.com/cgi-bin/cvsweb.cgi/xfs-linux/xfs_vfsops.c.diff?r1=text&tr1=1.464&r2=text&tr2=1.463&f=h
xfs_clnt.h - 1.46
http://oss.sgi.com/cgi-bin/cvsweb.cgi/xfs-linux/xfs_clnt.h.diff?r1=text&tr1=1.46&r2=text&tr2=1.45&f=h
xfs_mount.h - 1.195
http://oss.sgi.com/cgi-bin/cvsweb.cgi/xfs-linux/xfs_mount.h.diff?r1=text&tr1=1.195&r2=text&tr2=1.194&f=h
xfs_rename.c - 1.59
http://oss.sgi.com/cgi-bin/cvsweb.cgi/xfs-linux/xfs_rename.c.diff?r1=text&tr1=1.59&r2=text&tr2=1.58&f=h
linux-2.6/xfs_super.c - 1.332
http://oss.sgi.com/cgi-bin/cvsweb.cgi/xfs-linux/linux-2.6/xfs_super.c.diff?r1=text&tr1=1.332&r2=text&tr2=1.331&f=h