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         NULL
  42 };
  43 
  44 struct super_block *proc_read_super(struct super_block *s,void *data, 
     /*  */
  45                                     int silent)
  46 {
  47         lock_super(s);
  48         s->s_blocksize = 1024;
  49         s->s_magic = PROC_SUPER_MAGIC;
  50         s->s_op = &proc_sops;
  51         unlock_super(s);
  52         if (!(s->s_mounted = iget(s,PROC_ROOT_INO))) {
  53                 s->s_dev = 0;
  54                 printk("get root inode failed\n");
  55                 return NULL;
  56         }
  57         return s;
  58 }
  59 
  60 void proc_statfs(struct super_block *sb, struct statfs *buf)
     /*  */
  61 {
  62         put_fs_long(PROC_SUPER_MAGIC, &buf->f_type);
  63         put_fs_long(1024, &buf->f_bsize);
  64         put_fs_long(0, &buf->f_blocks);
  65         put_fs_long(0, &buf->f_bfree);
  66         put_fs_long(0, &buf->f_bavail);
  67         put_fs_long(0, &buf->f_files);
  68         put_fs_long(0, &buf->f_ffree);
  69         put_fs_long(NAME_MAX, &buf->f_namelen);
  70         /* Don't know what value to put in buf->f_fsid */
  71 }
  72 
  73 void proc_read_inode(struct inode * inode)
     /*  */
  74 {
  75         unsigned long ino, pid;
  76         struct task_struct * p;
  77         int i;
  78         
  79         inode->i_op = NULL;
  80         inode->i_mode = 0;
  81         inode->i_uid = 0;
  82         inode->i_gid = 0;
  83         inode->i_nlink = 1;
  84         inode->i_size = 0;
  85         inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
  86         inode->i_blocks = inode->i_blksize = 0;
  87         ino = inode->i_ino;
  88         pid = ino >> 16;
  89         p = task[0];
  90         for (i = 0; i < NR_TASKS ; i++)
  91                 if ((p = task[i]) && (p->pid == pid))
  92                         break;
  93         if (!p || i >= NR_TASKS)
  94                 return;
  95         if (ino == PROC_ROOT_INO) {
  96                 inode->i_mode = S_IFDIR | 0555;
  97                 inode->i_nlink = 2;
  98                 for (i = 1 ; i < NR_TASKS ; i++)
  99                         if (task[i])
 100                                 inode->i_nlink++;
 101                 inode->i_op = &proc_root_inode_operations;
 102                 return;
 103         }
 104         if ((ino >= 128) && (ino <= 160)) { /* files within /proc/net */
 105                 inode->i_mode = S_IFREG | 0444;
 106                 inode->i_op = &proc_net_inode_operations;
 107                 return;
 108         }
 109         if (!pid) {
 110                 switch (ino) {
 111                         case 5:
 112                                 inode->i_mode = S_IFREG | 0444;
 113                                 inode->i_op = &proc_kmsg_inode_operations;
 114                                 break;
 115                         case 8: /* for the net directory */
 116                                 inode->i_mode = S_IFDIR | 0555;
 117                                 inode->i_nlink = 2;
 118                                 inode->i_op = &proc_net_inode_operations;
 119                                 break;
 120                         default:
 121                                 inode->i_mode = S_IFREG | 0444;
 122                                 inode->i_op = &proc_array_inode_operations;
 123                                 break;
 124                 }
 125                 return;
 126         }
 127         ino &= 0x0000ffff;
 128         inode->i_uid = p->euid;
 129         inode->i_gid = p->egid;
 130         switch (ino) {
 131                 case 2:
 132                         inode->i_nlink = 4;
 133                         inode->i_mode = S_IFDIR | 0555;
 134                         inode->i_op = &proc_base_inode_operations;
 135                         return;
 136                 case 3:
 137                         inode->i_op = &proc_mem_inode_operations;
 138                         inode->i_mode = S_IFREG | 0600;
 139                         return;
 140                 case 4:
 141                 case 5:
 142                 case 6:
 143                         inode->i_op = &proc_link_inode_operations;
 144                         inode->i_size = 64;
 145                         inode->i_mode = S_IFLNK | 0700;
 146                         return;
 147                 case 7:
 148                 case 8:
 149                         inode->i_mode = S_IFDIR | 0500;
 150                         inode->i_op = &proc_fd_inode_operations;
 151                         inode->i_nlink = 2;
 152                         return;
 153                 case 9:
 154                 case 10:
 155                 case 11:
 156                 case 12:
 157                         inode->i_mode = S_IFREG | 0444;
 158                         inode->i_op = &proc_array_inode_operations;
 159                         return;
 160         }
 161         switch (ino >> 8) {
 162                 case 1:
 163                         ino &= 0xff;
 164                         if (ino >= NR_OPEN || !p->filp[ino])
 165                                 return;
 166                         inode->i_op = &proc_link_inode_operations;
 167                         inode->i_size = 64;
 168                         inode->i_mode = S_IFLNK | 0700;
 169                         return;
 170                 case 2:
 171                         ino &= 0xff;
 172                         if (ino >= p->numlibraries)
 173                                 return;
 174                         inode->i_op = &proc_link_inode_operations;
 175                         inode->i_size = 64;
 176                         inode->i_mode = S_IFLNK | 0700;
 177                         return;
 178         }
 179         return;
 180 }
 181 
 182 void proc_write_inode(struct inode * inode)
     /*  */
 183 {
 184         inode->i_dirt=0;
 185 }
/* */
root/fs/proc/inode.c

DEFINITIONS
