/*
* Called in the early (PREINIT) stage, when we immediately need some writable
* filesystem.
*/
static int
start(int argc, char *argv[1])
{
struct volume *root;
struct volume *data = volume_find("rootfs_data");
if (!getenv("PREINIT"))
return -1;
if (!data) {
root = volume_find("rootfs");
volume_init(root);
ULOG_NOTE("mounting /dev/root\n");
mount("/dev/root", "/", NULL, MS_NOATIME | MS_REMOUNT, 0);
}
/*
* Before trying to mount and use "rootfs_data" let's check if there is
* extroot configured. Following call will handle reading config from
* the "rootfs_data" on its own.
*/
extroot_prefix = "";
if (!mount_extroot()) {
ULOG_NOTE("switched to extroot\n");
return 0;
}
/* There isn't extroot, so just try to mount "rootfs_data" */
switch (volume_identify(data)) {
case FS_NONE:
ULOG_WARN("no usable overlay filesystem found, using tmpfs overlay\n");
return ramoverlay();
case FS_DEADCODE:
/*
* Filesystem isn't ready yet and we are in the preinit, so we
* can't afford waiting for it. Use tmpfs for now and handle it
* properly in the "done" call.
*/
ULOG_NOTE("jffs2 not ready yet, using temporary tmpfs overlay\n");
return ramoverlay();
case FS_JFFS2:
case FS_UBIFS:
mount_overlay(data);
break;
case FS_SNAPSHOT:
mount_snapshot(data);
break;
}
return 0;
}
static int
start(int argc, char *argv[1])
{
struct volume *v = volume_find("rootfs_data");
if (!getenv("PREINIT"))
return -1;
if (!v) {
v = volume_find("rootfs");
volume_init(v);
fprintf(stderr, "mounting /dev/root\n");
mount("/dev/root", "/", NULL, MS_NOATIME | MS_REMOUNT, 0);
return 0;
}
extroot_prefix = "";
if (!mount_extroot()) {
fprintf(stderr, "fs-state: switched to extroot\n");
return 0;
}
switch (volume_identify(v)) {
case FS_NONE:
case FS_DEADCODE:
return ramoverlay();
case FS_JFFS2:
case FS_UBIFS:
mount_overlay();
break;
case FS_SNAPSHOT:
mount_snapshot();
break;
}
return 0;
}
static int
done(int argc, char *argv[1])
{
struct volume *v = volume_find("rootfs_data");
if (!v)
return -1;
switch (volume_identify(v)) {
case FS_NONE:
case FS_DEADCODE:
return jffs2_switch(argc, argv);
}
return 0;
}
/*
* Called at the end of init, it can wait for filesystem if needed.
*/
static int
done(int argc, char *argv[1])
{
struct volume *v = volume_find("rootfs_data");
if (!v)
return -1;
switch (volume_identify(v)) {
case FS_NONE:
case FS_DEADCODE:
return jffs2_switch(v);
case FS_JFFS2:
case FS_UBIFS:
fs_state_set("/overlay", FS_STATE_READY);
break;
}
return 0;
}
int main(int argc, char **argv)
{
struct volume *v;
int ch, yes = 0, reset = 0;
while ((ch = getopt(argc, argv, "yr")) != -1) {
switch(ch) {
case 'y':
yes = 1;
break;
case 'r':
reset = 1;
break;
}
}
if (!yes && ask_user())
return -1;
/*
* TODO: Currently this only checks if kernel supports OverlayFS. We
* should check if there is a mount point using it with rootfs_data
* as upperdir.
*/
if (find_filesystem("overlay")) {
ULOG_ERR("overlayfs not supported by kernel\n");
return -1;
}
v = volume_find("rootfs_data");
if (!v) {
ULOG_ERR("MTD partition 'rootfs_data' not found\n");
return -1;
}
volume_init(v);
if (!strcmp(*argv, "jffs2mark"))
return jffs2_mark(v);
return jffs2_reset(v, reset);
}