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 <sys/types.h> 16 #include <sys/stat.h> 17 #include <unistd.h> 18 #include <stdio.h> 19 #include <stdlib.h> 20 21 #include <libubox/ulog.h> 22 23 #include "libfstools/libfstools.h" 24 #include "libfstools/volume.h" 25 26 /* 27 * Called in the early (PREINIT) stage, when we immediately need some writable 28 * filesystem. 29 */ 30 static int 31 start(int argc, char *argv[1]) 32 { 33 struct volume *root; 34 struct volume *data = volume_find("rootfs_data"); 35 struct stat s; 36 37 if (!getenv("PREINIT") && stat("/tmp/.preinit", &s)) 38 return -1; 39 40 if (!data) { 41 root = volume_find("rootfs"); 42 volume_init(root); 43 ULOG_NOTE("mounting /dev/root\n"); 44 mount("/dev/root", "/", NULL, MS_NOATIME | MS_REMOUNT, 0); 45 } 46 47 /* 48 * Before trying to mount and use "rootfs_data" let's check if there is 49 * extroot configured. Following call will handle reading config from 50 * the "rootfs_data" on its own. 51 */ 52 extroot_prefix = ""; 53 if (!mount_extroot()) { 54 ULOG_NOTE("switched to extroot\n"); 55 return 0; 56 } 57 58 /* There isn't extroot, so just try to mount "rootfs_data" */ 59 volume_init(data); 60 switch (volume_identify(data)) { 61 case FS_NONE: 62 ULOG_WARN("no usable overlay filesystem found, using tmpfs overlay\n"); 63 return ramoverlay(); 64 65 case FS_DEADCODE: 66 /* 67 * Filesystem isn't ready yet and we are in the preinit, so we 68 * can't afford waiting for it. Use tmpfs for now and handle it 69 * properly in the "done" call. 70 */ 71 ULOG_NOTE("jffs2 not ready yet, using temporary tmpfs overlay\n"); 72 return ramoverlay(); 73 74 case FS_EXT4: 75 case FS_F2FS: 76 case FS_JFFS2: 77 case FS_UBIFS: 78 mount_overlay(data); 79 break; 80 81 case FS_SNAPSHOT: 82 mount_snapshot(data); 83 break; 84 } 85 86 return 0; 87 } 88 89 static int 90 stop(int argc, char *argv[1]) 91 { 92 if (!getenv("SHUTDOWN")) 93 return -1; 94 95 return 0; 96 } 97 98 /* 99 * Called at the end of init, it can wait for filesystem if needed. 100 */ 101 static int 102 done(int argc, char *argv[1]) 103 { 104 struct volume *v = volume_find("rootfs_data"); 105 106 if (!v) 107 return -1; 108 109 switch (volume_identify(v)) { 110 case FS_NONE: 111 case FS_DEADCODE: 112 return jffs2_switch(v); 113 114 case FS_EXT4: 115 case FS_F2FS: 116 case FS_JFFS2: 117 case FS_UBIFS: 118 fs_state_set("/overlay", FS_STATE_READY); 119 break; 120 } 121 122 return 0; 123 } 124 125 int main(int argc, char **argv) 126 { 127 if (argc < 2) 128 return start(argc, argv); 129 if (!strcmp(argv[1], "ram")) 130 return ramoverlay(); 131 if (!strcmp(argv[1], "stop")) 132 return stop(argc, argv); 133 if (!strcmp(argv[1], "done")) 134 return done(argc, argv); 135 return -1; 136 } 137
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