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[PATCH] inode_diet: Replace inode.u.generic_ip with inode.i_private

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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.

[[email protected]: powerpc build fix]
Signed-off-by: "Theodore Ts'o" <[email protected]>
Signed-off-by: Judith Lebzelter <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Theodore Ts'o 2006-09-27 01:50:46 -07:00 • committed by Linus Torvalds
commit 8e18e2941c
36 changed files with 88 additions and 90 deletions
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4
fs/devpts/inode.c
View file

@ -177,7 +177,7 @@ int devpts_pty_new(struct tty_struct *tty)
inode->i_gid = config.setgid ? config.gid : current->fsgid;
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
init_special_inode(inode, S_IFCHR|config.mode, device);
inode->u.generic_ip = tty;
inode->i_private = tty;
dentry = get_node(number);
if (!IS_ERR(dentry) && !dentry->d_inode)
@ -196,7 +196,7 @@ struct tty_struct *devpts_get_tty(int number)
tty = NULL;
if (!IS_ERR(dentry)) {
if (dentry->d_inode)
tty = dentry->d_inode->u.generic_ip;
tty = dentry->d_inode->i_private;
dput(dentry);
}