[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>

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/dlm/debug_fs.c b/fs/dlm/debug_fs.c
index 9c3aeddc8667..ca94a837a5bb 100644
--- a/fs/dlm/debug_fs.c
+++ b/fs/dlm/debug_fs.c
@@ -282,7 +282,7 @@ static int rsb_open(struct inode *inode, struct file *file)
                 return ret;
 
         seq = file->private_data;
-        seq->private = inode->u.generic_ip;
+        seq->private = inode->i_private;
 
         return 0;
 }
@@ -301,7 +301,7 @@ static struct file_operations rsb_fops = {
 
 static int waiters_open(struct inode *inode, struct file *file)
 {
-        file->private_data = inode->u.generic_ip;
+        file->private_data = inode->i_private;
         return 0;
 }