mount_root.c

   1 /*
   2  * Copyright (C) 2014 John Crispin <blogic@openwrt.org>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU Lesser General Public License version 2.1
   6  * as published by the Free Software Foundation
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #include <sys/mount.h>
  15 #include <stdio.h>
  16 #include <stdlib.h>
  17
  18 #include "libfstools/libfstools.h"
  19 #include "libfstools/volume.h"
  20
  21 static int
  22 start(int argc, char *argv[1])
  23 {
  24         struct volume *v = volume_find("rootfs_data");
  25
  26         if (!getenv("PREINIT"))
  27                 return -1;
  28
  29         if (!v) {
  30                 v = volume_find("rootfs");
  31                 volume_init(v);
  32                 fprintf(stderr, "mounting /dev/root\n");
  33                 mount("/dev/root", "/", NULL, MS_NOATIME | MS_REMOUNT, 0);
  34                 return 0;
  35         }
  36
  37         extroot_prefix = "";
  38         if (!mount_extroot()) {
  39                 fprintf(stderr, "fs-state: switched to extroot\n");
  40                 return 0;
  41         }
  42
  43         switch (volume_identify(v)) {
  44         case FS_NONE:
  45         case FS_DEADCODE:
  46                 return ramoverlay();
  47
  48         case FS_JFFS2:
  49         case FS_UBIFS:
  50                 mount_overlay();
  51                 break;
  52
  53         case FS_SNAPSHOT:
  54                 mount_snapshot();
  55                 break;
  56         }
  57
  58         return 0;
  59 }
  60
  61 static int
  62 stop(int argc, char *argv[1])
  63 {
  64         if (!getenv("SHUTDOWN"))
  65                 return -1;
  66
  67         return 0;
  68 }
  69
  70 static int
  71 done(int argc, char *argv[1])
  72 {
  73         struct volume *v = volume_find("rootfs_data");
  74
  75         if (!v)
  76                 return -1;
  77
  78         switch (volume_identify(v)) {
  79         case FS_NONE:
  80         case FS_DEADCODE:
  81                 return jffs2_switch(argc, argv);
  82         }
  83
  84         return 0;
  85 }
  86
  87 int main(int argc, char **argv)
  88 {
  89         if (argc < 2)
  90                 return start(argc, argv);
  91         if (!strcmp(argv[1], "stop"))
  92                 return stop(argc, argv);
  93         if (!strcmp(argv[1], "done"))
  94                 return done(argc, argv);
  95         return -1;
  96 }