fs/proc/inode.c

/* */
This source file includes following definitions.
proc_put_inode
proc_put_super
proc_read_super
proc_statfs
proc_read_inode
proc_write_inode
   1 /*
   2  *  linux/fs/proc/inode.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  */
   6 
   7 #include <linux/sched.h>
   8 #include <linux/proc_fs.h>
   9 #include <linux/kernel.h>
  10 #include <linux/mm.h>
  11 #include <linux/string.h>
  12 #include <linux/stat.h>
  13 #include <linux/locks.h>
  14 #include <linux/limits.h>
  15 
  16 #include <asm/system.h>
  17 #include <asm/segment.h>
  18 
  19 void proc_put_inode(struct inode *inode)
     /*  */
  20 {
  21         if (inode->i_nlink)
  22                 return;
  23         inode->i_size = 0;
  24 }
  25 
  26 void proc_put_super(struct super_block *sb)
     /*  */
  27 {
  28         lock_super(sb);
  29         sb->s_dev = 0;
  30         unlock_super(sb);
  31 }
  32 
  33 static struct super_operations proc_sops = { 
  34         proc_read_inode,
  35         NULL,
  36         proc_write_inode,
  37         proc_put_inode,
  38         proc_put_super,
  39         NULL,
  40         proc_statfs
  41 };
  42 
  43 struct super_block *proc_read_super(struct super_block *s,void *data, 
     /*  */
  44                                     int silent)
  45 {
  46         lock_super(s);
  47         s->s_blocksize = 1024;
  48         s->s_magic = PROC_SUPER_MAGIC;
  49         s->s_op = &proc_sops;
  50         unlock_super(s);
  51         if (!(s->s_mounted = iget(s,PROC_ROOT_INO))) {
  52                 s->s_dev = 0;
  53                 printk("get root inode failed\n");
  54                 return NULL;
  55         }
  56         return s;
  57 }
  58 
  59 void proc_statfs(struct super_block *sb, struct statfs *buf)
     /*  */
  60 {
  61         put_fs_long(PROC_SUPER_MAGIC, &buf->f_type);
  62         put_fs_long(1024, &buf->f_bsize);
  63         put_fs_long(0, &buf->f_blocks);
  64         put_fs_long(0, &buf->f_bfree);
  65         put_fs_long(0, &buf->f_bavail);
  66         put_fs_long(0, &buf->f_files);
  67         put_fs_long(0, &buf->f_ffree);
  68         put_fs_long(NAME_MAX, &buf->f_namelen);
  69         /* Don't know what value to put in buf->f_fsid */
  70 }
  71 
  72 void proc_read_inode(struct inode * inode)
     /*  */
  73 {
  74         unsigned long ino, pid;
  75         struct task_struct * p;
  76         int i;
  77         
  78         inode->i_op = NULL;
  79         inode->i_mode = 0;
  80         inode->i_uid = 0;
  81         inode->i_gid = 0;
  82         inode->i_nlink = 1;
  83         inode->i_size = 0;
  84         inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
  85         inode->i_blocks = inode->i_blksize = 0;
  86         ino = inode->i_ino;
  87         pid = ino >> 16;
  88         p = task[0];
  89         for (i = 0; i < NR_TASKS ; i++)
  90                 if ((p = task[i]) && (p->pid == pid))
  91                         break;
  92         if (!p || i >= NR_TASKS)
  93                 return;
  94         if (ino == PROC_ROOT_INO) {
  95                 inode->i_mode = S_IFDIR | 0555;
  96                 inode->i_nlink = 2;
  97                 for (i = 1 ; i < NR_TASKS ; i++)
  98                         if (task[i])
  99                                 inode->i_nlink++;
 100                 inode->i_op = &proc_root_inode_operations;
 101                 return;
 102         }
 103         if (!pid) {
 104                 inode->i_mode = S_IFREG | 0444;
 105                 inode->i_op = &proc_array_inode_operations;
 106                 if (ino == 5) {
 107                         inode->i_mode = S_IFREG | 0400;
 108                         inode->i_op = &proc_kmsg_inode_operations;
 109                 }
 110                 return;
 111         }
 112         ino &= 0x0000ffff;
 113         inode->i_uid = p->euid;
 114         inode->i_gid = p->egid;
 115         switch (ino) {
 116                 case 2:
 117                         inode->i_nlink = 4;
 118                         inode->i_mode = S_IFDIR | 0555;
 119                         inode->i_op = &proc_base_inode_operations;
 120                         return;
 121                 case 3:
 122                         inode->i_op = &proc_mem_inode_operations;
 123                         inode->i_mode = S_IFREG | 0600;
 124                         return;
 125                 case 4:
 126                 case 5:
 127                 case 6:
 128                         inode->i_op = &proc_link_inode_operations;
 129                         inode->i_size = 64;
 130                         inode->i_mode = S_IFLNK | 0700;
 131                         return;
 132                 case 7:
 133                 case 8:
 134                         inode->i_mode = S_IFDIR | 0500;
 135                         inode->i_op = &proc_fd_inode_operations;
 136                         inode->i_nlink = 2;
 137                         return;
 138                 case 9:
 139                 case 10:
 140                 case 11:
 141                 case 12:
 142                         inode->i_mode = S_IFREG | 0444;
 143                         inode->i_op = &proc_array_inode_operations;
 144                         return;
 145         }
 146         switch (ino >> 8) {
 147                 case 1:
 148                         ino &= 0xff;
 149                         if (ino >= NR_OPEN || !p->filp[ino])
 150                                 return;
 151                         inode->i_op = &proc_link_inode_operations;
 152                         inode->i_size = 64;
 153                         inode->i_mode = S_IFLNK | 0700;
 154                         return;
 155                 case 2:
 156                         ino &= 0xff;
 157                         if (ino >= p->numlibraries)
 158                                 return;
 159                         inode->i_op = &proc_link_inode_operations;
 160                         inode->i_size = 64;
 161                         inode->i_mode = S_IFLNK | 0700;
 162                         return;
 163         }
 164         return;
 165 }
 166 
 167 void proc_write_inode(struct inode * inode)
     /*  */
 168 {
 169         inode->i_dirt=0;
 170 }
/* */
root/fs/proc/inode.c

DEFINITIONS
