[PATCH] comment out obsolete ext2 code

[Andreas Dilger <adilger@turbolinux.com>]

This patch comments out code in ext2 which is obsolete, or was never used
in the first place (i.e. future vision stuff, etc).  In particular, the
inode->i_attr_flags field is not used anywhere else in the kernel, and it
is only set, but not referenced in the ext2 code.  It could probably be
deleted entirely (saving 4 bytes in struct inode).

Similarly, the ext2_notify_change() function is not currently in use (but
it may be needed at some time in the future).  However, per previous
discussions with Stephen on ext2-devel, the 2.4 code is buggy (2.2 code
was fixed), so even though it is currently unused I have fixed it.  The
brokenness in question also relates to i_attr_flags, so it could also
be deleted entirely if that is the goal.

There are a couple of other obsolete bits not removed by this patch,
namely i_osync, and i_new_inode in ext2_inode_info.  Another day...

Cheers, Andreas
-- 
Andreas Dilger  \ "If a man ate a pound of pasta and a pound of antipasto,
                 \  would they cancel out, leaving him still hungry?"
http://www-mddsp.enel.ucalgary.ca/People/adilger/               -- Dogbert