From bba9dfd83587017de1c55a94c077983e0dfa0251 Mon Sep 17 00:00:00 2001 From: Theodore Ts'o Date: Wed, 27 Sep 2006 01:50:31 -0700 Subject: [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" Cc: Steven Whitehouse Signed-off-by: Andrew Morton --- fs/gfs2/meta_io.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'fs/gfs2/meta_io.c') diff --git a/fs/gfs2/meta_io.c b/fs/gfs2/meta_io.c index d3708af0a4d..73179915318 100644 --- a/fs/gfs2/meta_io.c +++ b/fs/gfs2/meta_io.c @@ -78,7 +78,7 @@ struct inode *gfs2_aspace_get(struct gfs2_sbd *sdp) mapping_set_gfp_mask(aspace->i_mapping, GFP_NOFS); aspace->i_mapping->a_ops = &aspace_aops; aspace->i_size = ~0ULL; - aspace->u.generic_ip = NULL; + aspace->i_private = NULL; insert_inode_hash(aspace); } return aspace; -- cgit v1.2.3