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proc: ->low_ino cleanup 

- ->low_ino is write-once field -- reading it under locks is unnecessary.

- /proc/$PID stuff never reaches pde_put()/free_proc_entry() --
   PROC_DYNAMIC_FIRST check never triggers.

- in proc_get_inode(), inode number always matches proc dir entry, so
  save one parameter.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexey Dobriyan 2011-01-12 17:00:33 -08:00 committed by Linus Torvalds
parent 9d6de12f70
commit 6d1b6e4eff
3 changed files with 6 additions and 15 deletions
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12
fs/proc/generic.c
View File

@ -425,13 +425,10 @@ struct dentry *proc_lookup_de(struct proc_dir_entry *de, struct inode *dir,
if (de->namelen != dentry->d_name.len)
continue;
if (!memcmp(dentry->d_name.name, de->name, de->namelen)) {
unsigned int ino;
ino = de->low_ino;
pde_get(de);
spin_unlock(&proc_subdir_lock);
error = -EINVAL;
inode = proc_get_inode(dir->i_sb, ino, de);
inode = proc_get_inode(dir->i_sb, de);
goto out_unlock;
}
}
@ -768,12 +765,7 @@ EXPORT_SYMBOL(proc_create_data);
static void free_proc_entry(struct proc_dir_entry *de)
{
unsigned int ino = de->low_ino;
if (ino < PROC_DYNAMIC_FIRST)
return;
release_inode_number(ino);
release_inode_number(de->low_ino);
if (S_ISLNK(de->mode))
kfree(de->data);

7
fs/proc/inode.c
View File

@ -416,12 +416,11 @@ static const struct file_operations proc_reg_file_ops_no_compat = {
};
#endif
struct inode *proc_get_inode(struct super_block *sb, unsigned int ino,
struct proc_dir_entry *de)
struct inode *proc_get_inode(struct super_block *sb, struct proc_dir_entry *de)
{
struct inode * inode;
inode = iget_locked(sb, ino);
inode = iget_locked(sb, de->low_ino);
if (!inode)
return NULL;
if (inode->i_state & I_NEW) {
@ -471,7 +470,7 @@ int proc_fill_super(struct super_block *s)
s->s_time_gran = 1;
pde_get(&proc_root);
root_inode = proc_get_inode(s, PROC_ROOT_INO, &proc_root);
root_inode = proc_get_inode(s, &proc_root);
if (!root_inode)
goto out_no_root;
root_inode->i_uid = 0;

2
fs/proc/internal.h
View File

@ -109,7 +109,7 @@ void pde_put(struct proc_dir_entry *pde);
extern struct vfsmount *proc_mnt;
int proc_fill_super(struct super_block *);
struct inode *proc_get_inode(struct super_block *, unsigned int, struct proc_dir_entry *);
struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *);
/*
* These are generic /proc routines that use the internal