2 * Copyright (C) 2014 John Crispin <blogic@openwrt.org>
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
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.
14 #include <sys/mount.h>
15 #include <sys/types.h>
21 #include <libubox/ulog.h>
23 #include "libfstools/libfstools.h"
24 #include "libfstools/volume.h"
27 * Called in the early (PREINIT) stage, when we immediately need some writable
31 start(int argc, char *argv[1])
34 struct volume *data = volume_find("rootfs_data");
37 if (!getenv("PREINIT") && stat("/tmp/.preinit", &s))
41 root = volume_find("rootfs");
43 ULOG_NOTE("mounting /dev/root\n");
44 mount("/dev/root", "/", NULL, MS_NOATIME | MS_REMOUNT, 0);
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.
53 if (!mount_extroot()) {
54 ULOG_NOTE("switched to extroot\n");
58 /* There isn't extroot, so just try to mount "rootfs_data" */
60 switch (volume_identify(data)) {
62 ULOG_WARN("no usable overlay filesystem found, using tmpfs overlay\n");
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.
71 ULOG_NOTE("jffs2 not ready yet, using temporary tmpfs overlay\n");
89 stop(int argc, char *argv[1])
91 if (!getenv("SHUTDOWN"))
98 * Called at the end of init, it can wait for filesystem if needed.
101 done(int argc, char *argv[1])
103 struct volume *v = volume_find("rootfs_data");
108 switch (volume_identify(v)) {
111 return jffs2_switch(v);
116 fs_state_set("/overlay", FS_STATE_READY);
123 int main(int argc, char **argv)
126 return start(argc, argv);
127 if (!strcmp(argv[1], "ram"))
129 if (!strcmp(argv[1], "stop"))
130 return stop(argc, argv);
131 if (!strcmp(argv[1], "done"))
132 return done(argc, argv);