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.
15 #include <sys/types.h>
16 #include <sys/mount.h>
18 #include <asm/byteorder.h>
30 #include "libfstools.h"
33 #define SWITCH_JFFS2 "/tmp/.switch_jffs2"
36 foreachdir(const char *dir, int (*cb)(const char*))
42 if (dir[strlen(dir) - 1] == '/')
43 snprintf(globdir, 256, "%s*", dir);
45 snprintf(globdir, 256, "%s/*", dir);
47 if (!glob(globdir, GLOB_NOESCAPE | GLOB_MARK | GLOB_ONLYDIR, NULL, &gl))
48 for (j = 0; j < gl.gl_pathc; j++)
49 foreachdir(gl.gl_pathv[j], cb);
55 overlay_mount(struct volume *v, char *fs)
57 if (mkdir("/tmp/overlay", 0755)) {
58 fprintf(stderr, "failed to mkdir /tmp/overlay: %s\n", strerror(errno));
62 if (mount(v->blk, "/tmp/overlay", fs, MS_NOATIME, NULL)) {
63 fprintf(stderr, "failed to mount -t %s %s /tmp/overlay: %s\n", fs, v->blk, strerror(errno));
67 return volume_init(v);
71 switch2jffs(struct volume *v)
76 if (!stat(SWITCH_JFFS2, &s)) {
77 fprintf(stderr, "jffs2 switch already running\n");
81 creat("/tmp/.switch_jffs2", 0600);
82 ret = mount(v->blk, "/rom/overlay", "jffs2", MS_NOATIME, NULL);
83 unlink("/tmp/.switch_jffs2");
85 fprintf(stderr, "failed - mount -t jffs2 %s /rom/overlay: %s\n", v->blk, strerror(errno));
89 if (mount("none", "/", NULL, MS_NOATIME | MS_REMOUNT, 0)) {
90 fprintf(stderr, "failed - mount -o remount,ro none: %s\n", strerror(errno));
94 system("cp -a /tmp/root/* /rom/overlay");
96 if (pivot("/rom", "/mnt")) {
97 fprintf(stderr, "failed - pivot /rom /mnt: %s\n", strerror(errno));
101 if (mount_move("/mnt", "/tmp/root", "")) {
102 fprintf(stderr, "failed - mount -o move /mnt /tmp/root %s\n", strerror(errno));
106 return fopivot("/overlay", "/rom");
110 handle_whiteout(const char *dir)
115 struct dirent **namelist;
118 n = scandir(dir, &namelist, NULL, NULL);
126 snprintf(file, sizeof(file), "%s%s", dir, namelist[n]->d_name);
127 if (!lstat(file, &s) && S_ISLNK(s.st_mode)) {
128 sz = readlink(file, link, sizeof(link) - 1);
133 orig = strstr(&file[1], "/");
134 if (orig && !strcmp(link, "(overlay-whiteout)"))
146 jffs2_switch(int argc, char **argv)
152 if (find_overlay_mount("overlayfs:/tmp/root"))
155 if (find_filesystem("overlay")) {
156 fprintf(stderr, "overlayfs not found\n");
160 v = volume_find("rootfs_data");
161 mp = find_mount_point(v->blk, NULL);
163 fprintf(stderr, "rootfs_data:%s is already mounted as %s\n", v->blk, mp);
167 switch (volume_identify(v)) {
169 fprintf(stderr, "no jffs2 marker found\n");
173 ret = switch2jffs(v);
175 fprintf(stderr, "doing fo cleanup\n");
176 umount2("/tmp/root", MNT_DETACH);
177 foreachdir("/overlay/", handle_whiteout);
182 ret = overlay_mount(v, "jffs2");
185 if (mount_move("/tmp", "", "/overlay") || fopivot("/overlay", "/rom")) {
186 fprintf(stderr, "switching to jffs2 failed\n");
195 static int overlay_mount_fs(void)
199 if (mkdir("/tmp/overlay", 0755)) {
200 fprintf(stderr, "failed to mkdir /tmp/overlay: %s\n", strerror(errno));
204 v = volume_find("rootfs_data");
206 fprintf(stderr, "rootfs_data does not exist\n");
210 if (mount(v->blk, "/tmp/overlay", "jffs2", MS_NOATIME, NULL)) {
211 fprintf(stderr, "failed to mount -t jffs2 %s /tmp/overlay: %s\n",
212 v->blk, strerror(errno));
221 int mount_overlay(void)
223 struct volume *v = volume_find("rootfs_data");;
229 mp = find_mount_point(v->blk, NULL);
231 fprintf(stderr, "rootfs_data:%s is already mounted as %s\n", v->blk, mp);
237 extroot_prefix = "/tmp/overlay";
238 if (!mount_extroot()) {
239 fprintf(stderr, "switched to extroot\n");
243 fprintf(stderr, "switching to jffs2\n");
244 if (mount_move("/tmp", "", "/overlay") || fopivot("/overlay", "/rom")) {
245 fprintf(stderr, "switching to jffs2 failed - fallback to ramoverlay\n");