*/
#include <sys/mount.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
+#include <libubox/ulog.h>
+
#include "libfstools/libfstools.h"
#include "libfstools/volume.h"
+/*
+ * Called in the early (PREINIT) stage, when we immediately need some writable
+ * filesystem.
+ */
static int
-start(int argc, char *argv[1])
+start(int argc, char *argv[3])
{
- struct volume *v = volume_find("rootfs_data");
+ struct volume *root;
+ struct volume *data = volume_find("rootfs_data");
+ struct stat s;
- if (!getenv("PREINIT"))
+ if (!getenv("PREINIT") && stat("/tmp/.preinit", &s))
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;
+ if (!data) {
+ root = volume_find("rootfs");
+ volume_init(root);
+ if (argc < 3)
+ ULOG_NOTE("mounting /dev/root\n");
+ else
+ ULOG_NOTE("mounting /dev/root with options %s\n", argv[2]);
+
+ /*
+ * If present, mount rootfs with passed options.
+ * Example F2FS filesystem with compress_algorithm option.
+ */
+ mount("/dev/root", "/", NULL, MS_NOATIME | MS_REMOUNT,
+ argc < 3 ? 0 : argv[2]);
}
- extroot_prefix = "";
- if (!mount_extroot()) {
- fprintf(stderr, "fs-state: switched to extroot\n");
+ /* Check for extroot config in rootfs before even trying rootfs_data */
+ if (!mount_extroot("")) {
+ ULOG_NOTE("switched to extroot\n");
return 0;
}
- switch (volume_identify(v)) {
+ /* There isn't extroot, so just try to mount "rootfs_data" */
+ volume_init(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_EXT4:
+ case FS_F2FS:
case FS_JFFS2:
case FS_UBIFS:
- mount_overlay(v);
+ mount_overlay(data);
break;
case FS_SNAPSHOT:
- mount_snapshot(v);
+ mount_snapshot(data);
break;
}
return 0;
}
+/*
+ * Called at the end of init, it can wait for filesystem if needed.
+ */
static int
done(int argc, char *argv[1])
{
case FS_NONE:
case FS_DEADCODE:
return jffs2_switch(v);
+
+ case FS_EXT4:
+ case FS_F2FS:
+ case FS_JFFS2:
+ case FS_UBIFS:
+ fs_state_set("/overlay", FS_STATE_READY);
+ break;
}
return 0;
int main(int argc, char **argv)
{
- if (argc < 2)
+ if (argc < 2 || !strcmp(argv[1], "start"))
return start(argc, argv);
+ if (!strcmp(argv[1], "ram"))
+ return ramoverlay();
if (!strcmp(argv[1], "stop"))
return stop(argc, argv);
if (!strcmp(argv[1], "done"))