TAKE 916964 - fix data loss on 2.4

[Nathan Scott <nathans@xxxxxxxxxxxxxxxxxxxxxxx>]

Fix data loss problem - we no longer update i_size anywhere without
holding i_sem for 2.4 too (and tweak 2.6 solution to be consistent).

Resolves the problem Tsuda reported here:
        http://oss.sgi.com/bugzilla/show_bug.cgi?id=339

Date:  Thu Jun 24 19:13:08 PDT 2004
Workarea:  snort.melbourne.sgi.com:/home/nathans/clean-xfs-linux
Inspected by:  felixb@xxxxxxx,hch@xxxxxx

The following file(s) were checked into:
  bonnie.engr.sgi.com:/isms/xfs-kern/xfs-linux


Modid:  xfs-linux:xfs-kern:174249a
linux-2.6/xfs_vnode.c - 1.122
linux-2.6/xfs_vnode.h - 1.94
linux-2.4/xfs_vnode.c - 1.125
linux-2.4/xfs_vnode.h - 1.91
linux-2.4/xfs_iops.c - 1.207
linux-2.6/xfs_ksyms.c - 1.8
linux-2.4/xfs_ksyms.c - 1.6