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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.

[judith@osdl.org: powerpc build fix]
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Judith Lebzelter <judith@osdl.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Theodore Ts'o 2006-09-27 01:50:46 -07:00 • committed by Linus Torvalds
parent 6a1d9805ec
commit 8e18e2941c
36 changed files with 88 additions and 90 deletions
Download patch file Download diff file Expand all files Collapse all files

8
fs/binfmt_misc.c
View file

@ -517,7 +517,7 @@ static struct inode *bm_get_inode(struct super_block *sb, int mode)
static void bm_clear_inode(struct inode *inode)
{
kfree(inode->u.generic_ip);
kfree(inode->i_private);
}
static void kill_node(Node *e)
@ -545,7 +545,7 @@ static void kill_node(Node *e)
static ssize_t
bm_entry_read(struct file * file, char __user * buf, size_t nbytes, loff_t *ppos)
{
Node *e = file->f_dentry->d_inode->u.generic_ip;
Node *e = file->f_dentry->d_inode->i_private;
loff_t pos = *ppos;
ssize_t res;
char *page;
@ -579,7 +579,7 @@ static ssize_t bm_entry_write(struct file *file, const char __user *buffer,
size_t count, loff_t *ppos)
{
struct dentry *root;
Node *e = file->f_dentry->d_inode->u.generic_ip;
Node *e = file->f_dentry->d_inode->i_private;
int res = parse_command(buffer, count);
switch (res) {
@ -646,7 +646,7 @@ static ssize_t bm_register_write(struct file *file, const char __user *buffer,
}
e->dentry = dget(dentry);
inode->u.generic_ip = e;
inode->i_private = e;
inode->i_fop = &bm_entry_operations;
d_instantiate(dentry, inode);