X-Git-Url: http://git.archive.openwrt.org/?p=project%2Ffstools.git;a=blobdiff_plain;f=mount_root.c;h=6e06b45806e5e05ae660f7692a6a1585bd220ef4;hp=c1524a406c2341231bc240b42a65ccec6f7e100f;hb=7a967198b9b18d00526094a43248b1c0892eb4aa;hpb=ba01996534d15dc725a2dcc56a59fbfb24b58787

diff --git a/mount_root.c b/mount_root.c
index c1524a4..6e06b45 100644
--- a/mount_root.c
+++ b/mount_root.c
@@ -12,46 +12,71 @@
  */
 
 #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])
 {
-	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");
+	if (!data) {
+		root = volume_find("rootfs");
+		volume_init(root);
+		ULOG_NOTE("mounting /dev/root\n");
 		mount("/dev/root", "/", NULL, MS_NOATIME | MS_REMOUNT, 0);
-		return 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()) {
-		fprintf(stderr, "fs-state: switched to extroot\n");
+		ULOG_NOTE("switched to extroot\n");
 		return 0;
 	}
 
-	switch (volume_identify(v)) {
+	/* 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(v);
+		mount_overlay(data);
 		break;
 
 	case FS_SNAPSHOT:
-		mount_snapshot(v);
+		mount_snapshot(data);
 		break;
 	}
 
@@ -67,6 +92,9 @@ stop(int argc, char *argv[1])
 	return 0;
 }
 
+/*
+ * Called at the end of init, it can wait for filesystem if needed.
+ */
 static int
 done(int argc, char *argv[1])
 {
@@ -79,6 +107,11 @@ done(int argc, char *argv[1])
 	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;
@@ -88,6 +121,8 @@ int main(int argc, char **argv)
 {
 	if (argc < 2)
 		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"))