Il CD di internet/CD.iso/SOURCE/KERNEL-S/V1.0/LINUX-1.0/LINUX-1/linux/fs/proc/inode.c

C/C++ Source or Header | 1994-02-23 | 4.3 KB | 201 lines

/*
 *  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;
}