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/*
* linux/fs/proc/inode.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
*/
#include <linux/sched.h>
#include <linux/proc_fs.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/stat.h>
#include <linux/locks.h>
#include <linux/limits.h>
#include <asm/system.h>
#include <asm/segment.h>
void proc_put_inode(struct inode *inode)
{
if (inode->i_nlink)
return;
inode->i_size = 0;
}
void proc_put_super(struct super_block *sb)
{
lock_super(sb);
sb->s_dev = 0;
unlock_super(sb);
}
static struct super_operations proc_sops = {
proc_read_inode,
NULL,
proc_write_inode,
proc_put_inode,
proc_put_super,
NULL,
proc_statfs,
NULL
};
struct super_block *proc_read_super(struct super_block *s,void *data,
int silent)
{
lock_super(s);
s->s_blocksize = 1024;
s->s_blocksize_bits = 10;
s->s_magic = PROC_SUPER_MAGIC;
s->s_op = &proc_sops;
unlock_super(s);
if (!(s->s_mounted = iget(s,PROC_ROOT_INO))) {
s->s_dev = 0;
printk("get root inode failed\n");
return NULL;
}
return s;
}
void proc_statfs(struct super_block *sb, struct statfs *buf)
{
put_fs_long(PROC_SUPER_MAGIC, &buf->f_type);
put_fs_long(PAGE_SIZE/sizeof(long), &buf->f_bsize);
put_fs_long(0, &buf->f_blocks);
put_fs_long(0, &buf->f_bfree);
put_fs_long(0, &buf->f_bavail);
put_fs_long(0, &buf->f_files);
put_fs_long(0, &buf->f_ffree);
put_fs_long(NAME_MAX, &buf->f_namelen);
/* Don't know what value to put in buf->f_fsid */
}
void proc_read_inode(struct inode * inode)
{
unsigned long ino, pid;
struct task_struct * p;
int i;
inode->i_op = NULL;
inode->i_mode = 0;
inode->i_uid = 0;
inode->i_gid = 0;
inode->i_nlink = 1;
inode->i_size = 0;
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
inode->i_blocks = 0;
inode->i_blksize = 1024;
ino = inode->i_ino;
pid = ino >> 16;
p = task[0];
for (i = 0; i < NR_TASKS ; i++)
if ((p = task[i]) && (p->pid == pid))
break;
if (!p || i >= NR_TASKS)
return;
if (ino == PROC_ROOT_INO) {
inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
inode->i_nlink = 2;
for (i = 1 ; i < NR_TASKS ; i++)
if (task[i])
inode->i_nlink++;
inode->i_op = &proc_root_inode_operations;
return;
}
if ((ino >= 128) && (ino <= 160)) { /* files within /proc/net */
inode->i_mode = S_IFREG | S_IRUGO;
inode->i_op = &proc_net_inode_operations;
return;
}
if (!pid) {
switch (ino) {
case 5:
inode->i_mode = S_IFREG | S_IRUGO;
inode->i_op = &proc_kmsg_inode_operations;
break;
case 8: /* for the net directory */
inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
inode->i_nlink = 2;
inode->i_op = &proc_net_inode_operations;
break;
case 14:
inode->i_mode = S_IFREG | S_IRUSR;
inode->i_op = &proc_array_inode_operations;
inode->i_size = high_memory + PAGE_SIZE;
break;
default:
inode->i_mode = S_IFREG | S_IRUGO;
inode->i_op = &proc_array_inode_operations;
break;
}
return;
}
ino &= 0x0000ffff;
inode->i_uid = p->euid;
inode->i_gid = p->egid;
switch (ino) {
case 2:
inode->i_nlink = 4;
inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
inode->i_op = &proc_base_inode_operations;
return;
case 3:
inode->i_op = &proc_mem_inode_operations;
inode->i_mode = S_IFREG | S_IRUSR | S_IWUSR;
return;
case 4:
case 5:
case 6:
inode->i_op = &proc_link_inode_operations;
inode->i_size = 64;
inode->i_mode = S_IFLNK | S_IRWXU;
return;
case 7:
case 8:
inode->i_mode = S_IFDIR | S_IRUSR | S_IXUSR;
inode->i_op = &proc_fd_inode_operations;
inode->i_nlink = 2;
return;
case 9:
case 10:
case 11:
case 12:
case 15:
inode->i_mode = S_IFREG | S_IRUGO;
inode->i_op = &proc_array_inode_operations;
return;
}
switch (ino >> 8) {
case 1:
ino &= 0xff;
if (ino >= NR_OPEN || !p->filp[ino])
return;
inode->i_op = &proc_link_inode_operations;
inode->i_size = 64;
inode->i_mode = S_IFLNK | S_IRWXU;
return;
case 2:
ino &= 0xff;
{
int j = 0;
struct vm_area_struct * mpnt;
for (mpnt = p->mmap ; mpnt ; mpnt = mpnt->vm_next)
if(mpnt->vm_inode)
j++;
if (ino >= j)
return;
}
inode->i_op = &proc_link_inode_operations;
inode->i_size = 64;
inode->i_mode = S_IFLNK | S_IRWXU;
return;
}
return;
}
void proc_write_inode(struct inode * inode)
{
inode->i_dirt=0;
}