From: Theodore Ts'o <tytso@mit.edu>
Date: Wed, 27 Sep 2006 08:50:31 +0000 (-0700)
Subject: [GFS2] inode_diet: Replace inode.u.generic_ip with inode.i_private (gfs)
X-Git-Tag: v2.6.19-rc1~32^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bba9dfd83587017de1c55a94c077983e0dfa0251;p=pandora-kernel.git

[GFS2] inode_diet: Replace inode.u.generic_ip with inode.i_private (gfs)

The following patches reduce the size of the VFS inode structure by 28 bytes
on a UP x86.  (It would be more on an x86_64 system).  This is a 10% reduction
in the inode size on a UP kernel that is configured in a production mode
(i.e., with no spinlock or other debugging functions enabled; if you want to
save memory taken up by in-core inodes, the first thing you should do is
disable the debugging options; they are responsible for a huge amount of bloat
in the VFS inode structure).

This patch:

The filesystem or device-specific pointer in the inode is inside a union,
which is pretty pointless given that all 30+ users of this field have been
using the void pointer.  Get rid of the union and rename it to i_private, with
a comment to explain who is allowed to use the void pointer.  This is just a
cleanup, but it allows us to reuse the union 'u' for something something where
the union will actually be used.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

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