root/fs/proc/inode.c

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DEFINITIONS

This source file includes following definitions.
  1. proc_put_inode
  2. proc_put_super
  3. parse_options
  4. proc_get_inode
  5. proc_read_super
  6. proc_statfs
  7. proc_read_inode
  8. 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 #include <linux/config.h>
  16 
  17 #include <asm/system.h>
  18 #include <asm/segment.h>
  19 
  20 static void proc_put_inode(struct inode *inode)
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  21 {
  22         if (inode->i_nlink)
  23                 return;
  24         inode->i_size = 0;
  25 }
  26 
  27 static void proc_put_super(struct super_block *sb)
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  28 {
  29         lock_super(sb);
  30         sb->s_dev = 0;
  31         unlock_super(sb);
  32 }
  33 
  34 static struct super_operations proc_sops = { 
  35         proc_read_inode,
  36         NULL,
  37         proc_write_inode,
  38         proc_put_inode,
  39         proc_put_super,
  40         NULL,
  41         proc_statfs,
  42         NULL
  43 };
  44 
  45 
  46 static int parse_options(char *options,uid_t *uid,gid_t *gid)
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  47 {
  48         char *this_char,*value;
  49 
  50         *uid = current->uid;
  51         *gid = current->gid;
  52         if (!options) return 1;
  53         for (this_char = strtok(options,","); this_char; this_char = strtok(NULL,",")) {
  54                 if ((value = strchr(this_char,'=')) != NULL)
  55                         *value++ = 0;
  56                 if (!strcmp(this_char,"uid")) {
  57                         if (!value || !*value)
  58                                 return 0;
  59                         *uid = simple_strtoul(value,&value,0);
  60                         if (*value)
  61                                 return 0;
  62                 }
  63                 else if (!strcmp(this_char,"gid")) {
  64                         if (!value || !*value)
  65                                 return 0;
  66                         *gid = simple_strtoul(value,&value,0);
  67                         if (*value)
  68                                 return 0;
  69                 }
  70                 else return 0;
  71         }
  72         return 1;
  73 }
  74 
  75 struct inode * proc_get_inode(struct super_block * s, int ino, struct proc_dir_entry * de)
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  76 {
  77         struct inode * inode = iget(s, ino);
  78         if (inode) {
  79                 inode->u.generic_ip = (void *) de;
  80                 if (de) {
  81                         if (de->mode) {
  82                                 inode->i_mode = de->mode;
  83                                 inode->i_uid = de->uid;
  84                                 inode->i_gid = de->gid;
  85                         }
  86                         if (de->size)
  87                                 inode->i_size = de->size;
  88                         if (de->ops)
  89                                 inode->i_op = de->ops;
  90                         if (de->nlink)
  91                                 inode->i_nlink = de->nlink;
  92                         if (de->fill_inode)
  93                                 de->fill_inode(inode);
  94                 }
  95         }
  96         return inode;
  97 }                       
  98 
  99 struct super_block *proc_read_super(struct super_block *s,void *data, 
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 100                                     int silent)
 101 {
 102         proc_root_init();
 103         lock_super(s);
 104         s->s_blocksize = 1024;
 105         s->s_blocksize_bits = 10;
 106         s->s_magic = PROC_SUPER_MAGIC;
 107         s->s_op = &proc_sops;
 108         unlock_super(s);
 109         if (!(s->s_mounted = proc_get_inode(s, PROC_ROOT_INO, &proc_root))) {
 110                 s->s_dev = 0;
 111                 printk("get root inode failed\n");
 112                 return NULL;
 113         }
 114         parse_options(data, &s->s_mounted->i_uid, &s->s_mounted->i_gid);
 115         return s;
 116 }
 117 
 118 void proc_statfs(struct super_block *sb, struct statfs *buf, int bufsiz)
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 119 {
 120         struct statfs tmp;
 121 
 122         tmp.f_type = PROC_SUPER_MAGIC;
 123         tmp.f_bsize = PAGE_SIZE/sizeof(long);
 124         tmp.f_blocks = 0;
 125         tmp.f_bfree = 0;
 126         tmp.f_bavail = 0;
 127         tmp.f_files = 0;
 128         tmp.f_ffree = 0;
 129         tmp.f_namelen = NAME_MAX;
 130         memcpy_tofs(buf, &tmp, bufsiz);
 131 }
 132 
 133 void proc_read_inode(struct inode * inode)
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 134 {
 135         unsigned long ino, pid;
 136         struct task_struct * p;
 137         int i;
 138         
 139         inode->i_op = NULL;
 140         inode->i_mode = 0;
 141         inode->i_uid = 0;
 142         inode->i_gid = 0;
 143         inode->i_nlink = 1;
 144         inode->i_size = 0;
 145         inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
 146         inode->i_blocks = 0;
 147         inode->i_blksize = 1024;
 148         ino = inode->i_ino;
 149         pid = ino >> 16;
 150         p = task[0];
 151         for (i = 0; i < NR_TASKS ; i++)
 152                 if ((p = task[i]) && (p->pid == pid))
 153                         break;
 154         if (!p || i >= NR_TASKS)
 155                 return;
 156         if (ino == PROC_ROOT_INO) {
 157                 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
 158                 inode->i_nlink = 2;
 159                 for (i = 1 ; i < NR_TASKS ; i++)
 160                         if (task[i])
 161                                 inode->i_nlink++;
 162                 return;
 163         }
 164 
 165         if (!pid) {
 166                 switch (ino) {
 167                         case PROC_KMSG:
 168                                 inode->i_mode = S_IFREG | S_IRUSR;
 169                                 inode->i_op = &proc_kmsg_inode_operations;
 170                                 break;
 171                         case PROC_NET:
 172                                 inode->i_nlink = 2;
 173                                 break;
 174                         case PROC_SCSI:
 175                                 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
 176                                 inode->i_nlink = 2;
 177                                 inode->i_op = &proc_scsi_inode_operations;
 178                                 break;
 179                         case PROC_KCORE:
 180                                 inode->i_mode = S_IFREG | S_IRUSR;
 181                                 inode->i_op = &proc_kcore_inode_operations;
 182                                 inode->i_size = (MAP_NR(high_memory) << PAGE_SHIFT) + PAGE_SIZE;
 183                                 break;
 184                         case PROC_PROFILE:
 185                                 inode->i_mode = S_IFREG | S_IRUGO | S_IWUSR;
 186                                 inode->i_op = &proc_profile_inode_operations;
 187                                 inode->i_size = (1+prof_len) * sizeof(unsigned long);
 188                                 break;
 189                         default:
 190                                 inode->i_mode = S_IFREG | S_IRUGO;
 191                                 inode->i_op = &proc_array_inode_operations;
 192                                 break;
 193                 }
 194                 return;
 195         }
 196         ino &= 0x0000ffff;
 197         if (ino == PROC_PID_INO || p->dumpable) {
 198                 inode->i_uid = p->euid;
 199                 inode->i_gid = p->egid;
 200         }
 201         switch (ino) {
 202                 case PROC_PID_INO:
 203                         inode->i_nlink = 4;
 204                         return;
 205                 case PROC_PID_MEM:
 206                         inode->i_op = &proc_mem_inode_operations;
 207                         inode->i_mode = S_IFREG | S_IRUSR | S_IWUSR;
 208                         return;
 209                 case PROC_PID_CWD:
 210                 case PROC_PID_ROOT:
 211                 case PROC_PID_EXE:
 212                         inode->i_op = &proc_link_inode_operations;
 213                         inode->i_size = 64;
 214                         inode->i_mode = S_IFLNK | S_IRWXU;
 215                         return;
 216                 case PROC_PID_FD:
 217                         inode->i_mode = S_IFDIR | S_IRUSR | S_IXUSR;
 218                         inode->i_op = &proc_fd_inode_operations;
 219                         inode->i_nlink = 2;
 220                         return;
 221                 case PROC_PID_ENVIRON:
 222                         inode->i_mode = S_IFREG | S_IRUSR;
 223                         inode->i_op = &proc_array_inode_operations;
 224                         return;
 225                 case PROC_PID_CMDLINE:
 226                 case PROC_PID_STAT:
 227                 case PROC_PID_STATM:
 228                         inode->i_mode = S_IFREG | S_IRUGO;
 229                         inode->i_op = &proc_array_inode_operations;
 230                         return;
 231                 case PROC_PID_MAPS:
 232                         inode->i_mode = S_IFIFO | S_IRUGO;
 233                         inode->i_op = &proc_arraylong_inode_operations;
 234                         return;
 235         }
 236         switch (ino >> 8) {
 237                 case PROC_PID_FD_DIR:
 238                         ino &= 0xff;
 239                         if (ino >= NR_OPEN || !p->files->fd[ino])
 240                                 return;
 241                         inode->i_op = &proc_link_inode_operations;
 242                         inode->i_size = 64;
 243                         inode->i_mode = S_IFLNK;
 244                         if (p->files->fd[ino]->f_mode & 1)
 245                                 inode->i_mode |= S_IRUSR | S_IXUSR;
 246                         if (p->files->fd[ino]->f_mode & 2)
 247                                 inode->i_mode |= S_IWUSR | S_IXUSR;
 248                         return;
 249         }
 250         return;
 251 }
 252 
 253 void proc_write_inode(struct inode * inode)
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 254 {
 255         inode->i_dirt=0;
 256 }

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