fs/proc/inode.c

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

DEFINITIONS
