lib/posix/_mount.c

   1
   2 #include <lib.h>
   3 #define mount   _mount
   4 #define umount  _umount
   5 #include <string.h>
   6 #include <unistd.h>
   7 #include <stdlib.h>
   8 #include <stdio.h>
   9 #include <sys/stat.h>
  10 #include <minix/syslib.h>
  11 #include <minix/rs.h>
  12 #include <minix/paths.h>
  13 #define OK      0
  14
  15 #define MFSNAME "mfs"
  16 #define MFSPATH "/sbin/"
  17
  18 PRIVATE int rs_down(char *label)
  19 {
  20         char cmd[200];
  21         message m;
  22         if(strlen(_PATH_SERVICE)+strlen(label)+50 >= sizeof(cmd))
  23                 return -1;
  24         sprintf(cmd, _PATH_SERVICE " down %s", label);
  25         return system(cmd);
  26 }
  27
  28 PRIVATE char *makelabel(_CONST char *special)
  29 {
  30   static char label[40];
  31   _CONST char *dev;
  32
  33   /* Make label name. */
  34   dev = strrchr(special, '/');
  35   if(dev) dev++;
  36   else dev = special;
  37   if(strlen(dev)+strlen(MFSNAME)+3 >= sizeof(label))
  38         return NULL;
  39   sprintf(label, MFSNAME "_%s", dev);
  40   return label;
  41 }
  42
  43 PUBLIC int mount(special, name, rwflag)
  44 char *name, *special;
  45 int rwflag;
  46 {
  47   int r;
  48   message m;
  49   struct rs_start rs_start;
  50   char *label;
  51   char cmd[200];
  52   FILE *pipe;
  53   int ep;
  54
  55   /* Make MFS process label for RS from special name. */
  56   if(!(label=makelabel(special))) {
  57         errno = E2BIG;
  58         return -1;
  59   }
  60
  61   if(strlen(_PATH_SERVICE)+strlen(MFSPATH)+strlen(MFSNAME)+
  62      strlen(label)+50 >= sizeof(cmd)) {
  63         errno = E2BIG;
  64         return -1;
  65   }
  66
  67   sprintf(cmd, _PATH_SERVICE " up " MFSPATH MFSNAME
  68         " -label \"%s\" -config " _PATH_DRIVERS_CONF " -printep yes",
  69         label);
  70
  71   if(!(pipe = popen(cmd, "r"))) {
  72         fprintf(stderr, "mount: couldn't run %s\n", cmd);
  73         return -1;
  74   }
  75   if(fscanf(pipe, "%d", &ep) != 1 || ep <= 0) {
  76         fprintf(stderr, "mount: couldn't parse endpoint from %s\n", cmd);
  77         errno = EINVAL;
  78         pclose(pipe);
  79         return -1;
  80   }
  81   pclose(pipe);
  82
  83   /* Now perform mount(). */
  84   m.m1_i1 = strlen(special) + 1;
  85   m.m1_i2 = strlen(name) + 1;
  86   m.m1_i3 = rwflag;
  87   m.m1_p1 = special;
  88   m.m1_p2 = name;
  89   m.m1_p3 = (char*) ep;
  90   r = _syscall(FS, MOUNT, &m);
  91
  92   if(r != OK) {
  93         /* If mount() failed, tell RS to shutdown MFS process.
  94          * No error check - won't do anything with this error anyway.
  95          */
  96         rs_down(label);
  97   }
  98
  99   return r;
 100 }
 101
 102 PUBLIC int umount(name)
 103 _CONST char *name;
 104 {
 105   message m;
 106   char *label;
 107   int r;
 108
 109   /* Make MFS process label for RS from special name. */
 110   if(!(label=makelabel(name))) {
 111         errno = E2BIG;
 112         return -1;
 113   }
 114
 115   _loadname(name, &m);
 116   r = _syscall(FS, UMOUNT, &m);
 117
 118   if(r == OK) {
 119         rs_down(label);
 120   }
 121
 122   return r;
 123 }