fs/proc/inode.c

/* */
This source file includes following definitions.
proc_put_inode
proc_put_super
proc_read_super
proc_statfs
proc_bmap
proc_create_block
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 
  15 #include <asm/system.h>
  16 #include <asm/segment.h>
  17 
  18 void proc_put_inode(struct inode *inode)
     /*  */
  19 {
  20         if (inode->i_nlink)
  21                 return;
  22         inode->i_size = 0;
  23 }
  24 
  25 void proc_put_super(struct super_block *sb)
     /*  */
  26 {
  27         lock_super(sb);
  28         sb->s_dev = 0;
  29         unlock_super(sb);
  30 }
  31 
  32 static struct super_operations proc_sops = { 
  33         proc_read_inode,
  34         NULL,
  35         proc_write_inode,
  36         proc_put_inode,
  37         proc_put_super,
  38         NULL,
  39         proc_statfs
  40 };
  41 
  42 struct super_block *proc_read_super(struct super_block *s,void *data)
     /*  */
  43 {
  44         lock_super(s);
  45         s->s_blocksize = 1024;
  46         s->s_magic = PROC_SUPER_MAGIC;
  47         s->s_op = &proc_sops;
  48         unlock_super(s);
  49         if (!(s->s_mounted = iget(s,PROC_ROOT_INO))) {
  50                 s->s_dev = 0;
  51                 printk("get root inode failed\n");
  52                 return NULL;
  53         }
  54         return s;
  55 }
  56 
  57 void proc_statfs(struct super_block *sb, struct statfs *buf)
     /*  */
  58 {
  59         put_fs_long(PROC_SUPER_MAGIC, &buf->f_type);
  60         put_fs_long(1024, &buf->f_bsize);
  61         put_fs_long(0, &buf->f_blocks);
  62         put_fs_long(0, &buf->f_bfree);
  63         put_fs_long(0, &buf->f_bavail);
  64         put_fs_long(0, &buf->f_files);
  65         put_fs_long(0, &buf->f_ffree);
  66         /* Don't know what value to put in buf->f_fsid */
  67 }
  68 
  69 int proc_bmap(struct inode * inode,int block)
     /*  */
  70 {
  71         return 0;
  72 }
  73 
  74 int proc_create_block(struct inode * inode, int block)
     /*  */
  75 {
  76         return 0;
  77 }
  78 
  79 void proc_read_inode(struct inode * inode)
     /*  */
  80 {
  81         unsigned long ino, pid;
  82         struct task_struct * p;
  83         int i;
  84         
  85         inode->i_op = NULL;
  86         inode->i_mode = 0;
  87         inode->i_uid = 0;
  88         inode->i_gid = 0;
  89         inode->i_nlink = 1;
  90         inode->i_size = 0;
  91         inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
  92         inode->i_blocks = inode->i_blksize = 0;
  93         ino = inode->i_ino;
  94         pid = ino >> 16;
  95         p = task[0];
  96         for (i = 0; i < NR_TASKS ; i++)
  97                 if ((p = task[i]) && (p->pid == pid))
  98                         break;
  99         if (!p || i >= NR_TASKS)
 100                 return;
 101         if (ino == PROC_ROOT_INO) {
 102                 inode->i_mode = S_IFDIR | 0555;
 103                 inode->i_op = &proc_root_inode_operations;
 104                 return;
 105         }
 106         if (!pid)
 107                 return;
 108         ino &= 0x0000ffff;
 109         inode->i_uid = p->euid;
 110         inode->i_gid = p->egid;
 111         switch (ino) {
 112                 case 2:
 113                         inode->i_nlink = 2;
 114                         for (i = 1 ; i < NR_TASKS ; i++)
 115                                 if (task[i])
 116                                         inode->i_nlink++;
 117                         inode->i_mode = S_IFDIR | 0500;
 118                         inode->i_op = &proc_base_inode_operations;
 119                         return;
 120                 case 3:
 121                         inode->i_op = &proc_mem_inode_operations;
 122                         inode->i_mode = S_IFCHR | 0600;
 123                         inode->i_rdev = 0x0101;
 124                         return;
 125                 case 4:
 126                 case 5:
 127                 case 6:
 128                         inode->i_op = &proc_link_inode_operations;
 129                         inode->i_size = 3;
 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         }
 139         switch (ino >> 8) {
 140                 case 1:
 141                         ino &= 0xff;
 142                         if (ino >= NR_OPEN || !p->filp[ino])
 143                                 return;
 144                         inode->i_op = &proc_link_inode_operations;
 145                         inode->i_size = 3;
 146                         inode->i_mode = S_IFLNK | 0700;
 147                         return;
 148                 case 2:
 149                         ino &= 0xff;
 150                         if (ino >= p->numlibraries)
 151                                 return;
 152                         inode->i_op = &proc_link_inode_operations;
 153                         inode->i_size = 3;
 154                         inode->i_mode = S_IFLNK | 0700;
 155                         return;
 156         }
 157         return;
 158 }
 159 
 160 void proc_write_inode(struct inode * inode)
     /*  */
 161 {
 162         inode->i_dirt=0;
 163 }
/* */
root/fs/proc/inode.c

DEFINITIONS
