--- /dev/null
+/*
+ * Copyright (C) 2014 John Crispin <blogic@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1
+ * as published by the Free Software Foundation
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/mount.h>
+
+#include <asm/byteorder.h>
+
+#include <errno.h>
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <glob.h>
+#include <errno.h>
+#include <dirent.h>
+#include <fcntl.h>
+
+#include "../fs-state.h"
+#include "../driver/volume.h"
+
+#define SWITCH_JFFS2 "/tmp/.switch_jffs2"
+
+void
+foreachdir(const char *dir, int (*cb)(const char*))
+{
+ char globdir[256];
+ glob_t gl;
+ int j;
+
+ if (dir[strlen(dir) - 1] == '/')
+ snprintf(globdir, 256, "%s*", dir);
+ else
+ snprintf(globdir, 256, "%s/*", dir);
+
+ if (!glob(globdir, GLOB_NOESCAPE | GLOB_MARK | GLOB_ONLYDIR, NULL, &gl))
+ for (j = 0; j < gl.gl_pathc; j++)
+ foreachdir(gl.gl_pathv[j], cb);
+
+ cb(dir);
+}
+
+static int
+overlay_mount(struct volume *v, char *fs)
+{
+ if (mkdir("/tmp/overlay", 0755)) {
+ fprintf(stderr, "failed to mkdir /tmp/overlay: %s\n", strerror(errno));
+ return -1;
+ }
+
+ if (mount(v->blk, "/tmp/overlay", fs, MS_NOATIME, NULL)) {
+ fprintf(stderr, "failed to mount -t %s %s /tmp/overlay: %s\n", fs, v->blk, strerror(errno));
+ return -1;
+ }
+
+ return volume_init(v);
+}
+
+static int
+switch2jffs(struct volume *v)
+{
+ struct stat s;
+ int ret;
+
+ if (!stat(SWITCH_JFFS2, &s)) {
+ fprintf(stderr, "jffs2 switch already running\n");
+ return -1;
+ }
+
+ creat("/tmp/.switch_jffs2", 0600);
+ ret = mount(v->blk, "/rom/overlay", "jffs2", MS_NOATIME, NULL);
+ unlink("/tmp/.switch_jffs2");
+ if (ret) {
+ fprintf(stderr, "failed - mount -t jffs2 %s /rom/overlay: %s\n", v->blk, strerror(errno));
+ return -1;
+ }
+
+ if (mount("none", "/", NULL, MS_NOATIME | MS_REMOUNT, 0)) {
+ fprintf(stderr, "failed - mount -o remount,ro none: %s\n", strerror(errno));
+ return -1;
+ }
+
+ system("cp -a /tmp/root/* /rom/overlay");
+
+ if (pivot("/rom", "/mnt")) {
+ fprintf(stderr, "failed - pivot /rom /mnt: %s\n", strerror(errno));
+ return -1;
+ }
+
+ if (mount_move("/mnt", "/tmp/root", "")) {
+ fprintf(stderr, "failed - mount -o move /mnt /tmp/root %s\n", strerror(errno));
+ return -1;
+ }
+
+ return fopivot("/overlay", "/rom");
+}
+
+int
+handle_whiteout(const char *dir)
+{
+ struct stat s;
+ char link[256];
+ ssize_t sz;
+ struct dirent **namelist;
+ int n;
+
+ n = scandir(dir, &namelist, NULL, NULL);
+
+ if (n < 1)
+ return -1;
+
+ while (n--) {
+ char file[256];
+
+ snprintf(file, sizeof(file), "%s%s", dir, namelist[n]->d_name);
+ if (!lstat(file, &s) && S_ISLNK(s.st_mode)) {
+ sz = readlink(file, link, sizeof(link) - 1);
+ if (sz > 0) {
+ char *orig;
+
+ link[sz] = '\0';
+ orig = strstr(&file[1], "/");
+ if (orig && !strcmp(link, "(overlay-whiteout)"))
+ unlink(orig);
+ }
+ }
+ free(namelist[n]);
+ }
+ free(namelist);
+
+ return 0;
+}
+
+static int
+ask_user(int argc, char **argv)
+{
+ if ((argc < 2) || strcmp(argv[1], "-y")) {
+ fprintf(stderr, "This will erase all settings and remove any installed packages. Are you sure? [N/y]\n");
+ if (getchar() != 'y')
+ return -1;
+ }
+ return 0;
+
+}
+
+int
+jffs2_switch(int argc, char **argv)
+{
+ struct volume *v;
+ char *mp;
+ int ret = -1;
+
+ if (find_overlay_mount("overlayfs:/tmp/root"))
+ return -1;
+
+ if (find_filesystem("overlay")) {
+ fprintf(stderr, "overlayfs not found\n");
+ return ret;
+ }
+
+ v = volume_find("rootfs_data");
+ mp = find_mount_point(v->blk, NULL);
+ if (mp) {
+ fprintf(stderr, "rootfs_data:%s is already mounted as %s\n", v->blk, mp);
+ return -1;
+ }
+
+ switch (volume_identify(v)) {
+ case FS_NONE:
+ fprintf(stderr, "no jffs2 marker found\n");
+ /* fall through */
+
+ case FS_DEADCODE:
+ ret = switch2jffs();
+ if (!ret) {
+ fprintf(stderr, "doing fo cleanup\n");
+ umount2("/tmp/root", MNT_DETACH);
+ foreachdir("/overlay/", handle_whiteout);
+ }
+ break;
+
+ case FS_JFFS2:
+ ret = overlay_mount(v, "jffs2");
+ if (ret)
+ break;
+ if (mount_move("/tmp", "", "/overlay") || fopivot("/overlay", "/rom")) {
+ fprintf(stderr, "switching to jffs2 failed\n");
+ ret = -1;
+ }
+ break;
+ }
+
+ return ret;
+}
+
+static int overlay_mount_fs(void)
+{
+ struct volume *v;
+
+ if (mkdir("/tmp/overlay", 0755)) {
+ fprintf(stderr, "failed to mkdir /tmp/overlay: %s\n", strerror(errno));
+ return -1;
+ }
+
+ v = volume_find("rootfs_data");
+ if (!v) {
+ fprintf(stderr, "rootfs_data does not exist\n");
+ return -1;
+ }
+
+ if (mount(v->blk, "/tmp/overlay", "jffs2", MS_NOATIME, NULL)) {
+ fprintf(stderr, "failed to mount -t jffs2 %s /tmp/overlay: %s\n",
+ v->blk, strerror(errno));
+ return -1;
+ }
+
+ volume_init(v);
+
+ return -1;
+}
+
+static int overlay_mount(void)
+{
+ struct volume *v = volume_find("rootfs_data");;
+ char *mp;
+
+ if (!v)
+ return -1;
+
+ mp = find_mount_point(v->blk, NULL);
+ if (mp) {
+ fprintf(stderr, "rootfs_data:%s is already mounted as %s\n", v->blk, mp);
+ return -1;
+ }
+
+ overlay_mount_fs();
+
+ extroot_prefix = "/tmp/overlay";
+ if (!backend_mount("extroot")) {
+ fprintf(stderr, "fs-state: switched to extroot\n");
+ return 0;
+ }
+
+ fprintf(stderr, "switching to jffs2\n");
+ if (mount_move("/tmp", "", "/overlay") || fopivot("/overlay", "/rom")) {
+ fprintf(stderr, "switching to jffs2 failed - fallback to ramoverlay\n");
+ return ramoverlay();
+ }
+
+ return -1;
+}
+
+static struct backend overlay_backend = {
+ .name = "overlay",
+ .mount = overlay_mount,
+};
+BACKEND(overlay_backend);
projects / project / fstools.git / blobdiff