2 * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
3 * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU Lesser General Public License version 2.1
7 * as published by the Free Software Foundation
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
28 #include <sys/types.h>
29 #include <sys/mount.h>
32 #include <asm/byteorder.h>
34 #include <mtd/mtd-user.h>
36 #define DEBUG(level, fmt, ...) do { \
38 fprintf(stderr, "%s %s(%d): " fmt, argv0, __func__, __LINE__, ## __VA_ARGS__); \
41 #define LOG(fmt, ...) do { \
42 syslog(LOG_INFO, fmt, ## __VA_ARGS__); \
43 fprintf(stderr, "%s: "fmt, argv0, ## __VA_ARGS__); \
46 #define ERROR(fmt, ...) do { \
47 syslog(LOG_ERR, fmt, ## __VA_ARGS__); \
48 fprintf(stderr, "%s: "fmt, argv0, ## __VA_ARGS__); \
57 static const char *argv0;
59 /* this is a raw syscall - man 2 pivot_root */
60 extern int pivot_root(const char *new_root, const char *put_old);
64 static void foreachdir(const char *dir, int (*cb)(const char*))
70 if (dir[strlen(dir) - 1] == '/')
71 snprintf(globdir, 256, "%s*", dir);
73 snprintf(globdir, 256, "%s/*", dir);
75 if (!glob(globdir, GLOB_NOESCAPE | GLOB_MARK | GLOB_ONLYDIR, NULL, &gl))
76 for (j = 0; j < gl.gl_pathc; j++)
77 foreachdir(gl.gl_pathv[j], cb);
82 static int find_overlay_mount(char *overlay)
84 FILE *fp = fopen("/proc/mounts", "r");
85 static char line[256];
91 while (ret && fgets(line, sizeof(line), fp))
92 if (!strncmp(line, overlay, strlen(overlay)))
100 static char* find_mount(char *mp)
102 FILE *fp = fopen("/proc/mounts", "r");
103 static char line[256];
109 while (fgets(line, sizeof(line), fp)) {
110 char *s, *t = strstr(line, " ");
120 if (!strcmp(t, mp)) {
131 static char* find_mount_point(char *block, char *fs)
133 FILE *fp = fopen("/proc/mounts", "r");
134 static char line[256];
135 int len = strlen(block);
141 while (fgets(line, sizeof(line), fp)) {
142 if (!strncmp(line, block, len)) {
143 char *p = &line[len + 1];
144 char *t = strstr(p, " ");
152 if (fs && strncmp(t, fs, strlen(fs))) {
153 ERROR("block is mounted with wrong fs\n");
166 static char* find_mtd_index(char *name)
168 FILE *fp = fopen("/proc/mtd", "r");
169 static char line[256];
175 while (!index && fgets(line, sizeof(line), fp)) {
176 if (strstr(line, name)) {
177 char *eol = strstr(line, ":");
184 DEBUG(1, "found %s -> index:%s\n", name, index);
193 static int find_mtd_block(char *name, char *part, int plen)
195 char *index = find_mtd_index(name);
200 snprintf(part, plen, "/dev/mtdblock%s", index);
201 DEBUG(1, "found %s -> %s\n", name, part);
206 static int find_mtd_char(char *name, char *part, int plen)
208 char *index = find_mtd_index(name);
213 snprintf(part, plen, "/dev/mtd%s", index);
214 DEBUG(1, "found %s -> %s\n", name, part);
219 static int mtd_unlock(char *mtd)
221 struct erase_info_user mtdlock;
222 struct mtd_info_user mtdinfo;
223 int fd = open(mtd, O_RDWR | O_SYNC);
226 DEBUG(1, "%s\n", mtd);
229 ERROR("failed to open %s: %s\n", mtd, strerror(errno));
233 ret = ioctl(fd, MEMGETINFO, &mtdinfo);
235 ERROR("ioctl(%s, MEMGETINFO) failed: %s\n", mtd, strerror(errno));
240 mtdlock.length = mtdinfo.size;
241 ioctl(fd, MEMUNLOCK, &mtdlock);
249 static int mtd_mount_jffs2(void)
251 char rootfs_data[32];
253 if (mkdir("/tmp/overlay", 0755)) {
254 ERROR("failed to mkdir /tmp/overlay: %s\n", strerror(errno));
258 if (find_mtd_block("rootfs_data", rootfs_data, sizeof(rootfs_data))) {
259 ERROR("rootfs_data does not exist\n");
263 if (mount(rootfs_data, "/tmp/overlay", "jffs2", MS_NOATIME, NULL)) {
264 ERROR("failed to mount -t jffs2 %s /tmp/overlay: %s\n", rootfs_data, strerror(errno));
268 find_mtd_char("rootfs_data", rootfs_data, sizeof(rootfs_data));
270 return mtd_unlock(rootfs_data);
273 static int jffs2_ready(char *mtd)
275 FILE *fp = fopen(mtd, "r");
281 ERROR("reading %s failed\n", mtd);
285 sz = fread(&deadc0de, sizeof(deadc0de), 1, fp);
289 ERROR("reading %s failed: %s\n", mtd, strerror(errno));
293 deadc0de = __be32_to_cpu(deadc0de);
294 jffs2 = __be16_to_cpu(deadc0de >> 16);
296 if (jffs2 == 0x1985) {
297 LOG("jffs2 is ready\n");
301 if (deadc0de == 0xdeadc0de) {
302 LOG("jffs2 is not ready - marker found\n");
306 ERROR("No jffs2 marker was found\n");
311 static int check_fs_exists(char *fs)
313 FILE *fp = fopen("/proc/filesystems", "r");
314 static char line[256];
317 DEBUG(2, "%s\n", fs);
320 ERROR("opening /proc/filesystems failed: %s\n", strerror(errno));
324 while (ret && fgets(line, sizeof(line), fp))
325 if (strstr(line, fs))
334 static int mount_move(char *oldroot, char *newroot, char *dir)
337 #define MS_MOVE (1 << 13)
344 DEBUG(2, "%s %s %s\n", oldroot, newroot, dir);
346 snprintf(olddir, sizeof(olddir), "%s%s", oldroot, dir);
347 snprintf(newdir, sizeof(newdir), "%s%s", newroot, dir);
349 if (stat(olddir, &s) || !S_ISDIR(s.st_mode))
352 if (stat(newdir, &s) || !S_ISDIR(s.st_mode))
355 ret = mount(olddir, newdir, NULL, MS_NOATIME | MS_MOVE, NULL);
358 DEBUG(1, "failed %s %s: %s\n", olddir, newdir, strerror(errno));
363 static int pivot(char *new, char *old)
368 DEBUG(2, "%s %s\n", new, old);
370 if (mount_move("", new, "/proc"))
373 snprintf(pivotdir, sizeof(pivotdir), "%s%s", new, old);
375 ret = pivot_root(new, pivotdir);
378 ERROR("pivot_root failed %s %s: %s\n", new, pivotdir, strerror(errno));
382 mount_move(old, "", "/dev");
383 mount_move(old, "", "/tmp");
384 mount_move(old, "", "/sys");
385 mount_move(old, "", "/overlay");
390 static int fopivot(char *rw_root, char *ro_root)
392 char overlay[64], lowerdir[64];
394 DEBUG(2, "%s %s\n", rw_root, ro_root);
396 if (check_fs_exists("overlay")) {
397 ERROR("BUG: no suitable fs found\n");
401 snprintf(overlay, sizeof(overlay), "overlayfs:%s", rw_root);
402 snprintf(lowerdir, sizeof(lowerdir), "lowerdir=/,upperdir=%s", rw_root);
404 if (mount(overlay, "/mnt", "overlayfs", MS_NOATIME, lowerdir)) {
405 ERROR("mount failed: %s\n", strerror(errno));
409 return pivot("/mnt", ro_root);
412 static int ramoverlay(void)
416 mkdir("/tmp/root", 0755);
417 mount("tmpfs", "/tmp/root", "tmpfs", MS_NOATIME, "mode=0755");
419 return fopivot("/tmp/root", "/rom");
422 static int switch2jffs(void)
426 if (find_mtd_block("rootfs_data", mtd, sizeof(mtd))) {
427 ERROR("no rootfs_data was found\n");
431 if (mount(mtd, "/rom/overlay", "jffs2", MS_NOATIME, NULL)) {
432 ERROR("failed - mount -t jffs2 %s /rom/overlay: %s\n", mtd, strerror(errno));
436 if (mount("none", "/", NULL, MS_NOATIME | MS_REMOUNT, 0)) {
437 ERROR("failed - mount -o remount,ro none: %s\n", strerror(errno));
441 system("cp -a /tmp/root/* /rom/overlay");
443 if (pivot("/rom", "/mnt")) {
444 ERROR("failed - pivot /rom /mnt: %s\n", strerror(errno));
448 if (mount_move("/mnt", "/tmp/root", "")) {
449 ERROR("failed - mount -o move /mnt /tmp/root %s\n", strerror(errno));
453 return fopivot("/overlay", "/rom");
456 static int handle_whiteout(const char *dir)
461 struct dirent **namelist;
464 n = scandir(dir, &namelist, NULL, NULL);
472 snprintf(file, sizeof(file), "%s%s", dir, namelist[n]->d_name);
473 if (!lstat(file, &s) && S_ISLNK(s.st_mode)) {
474 sz = readlink(file, link, sizeof(link) - 1);
479 orig = strstr(&file[1], "/");
480 if (orig && !strcmp(link, "(overlay-whiteout)")) {
481 DEBUG(1, "unlinking %s\n", orig);
493 static int mtd_erase(const char *mtd)
495 int fd = open(mtd, O_RDWR | O_SYNC);
496 struct mtd_info_user i;
497 struct erase_info_user e;
501 ERROR("failed to open %s: %s\n", mtd, strerror(errno));
505 ret = ioctl(fd, MEMGETINFO, &i);
507 ERROR("ioctl(%s, MEMGETINFO) failed: %s\n", mtd, strerror(errno));
511 e.length = i.erasesize;
512 for (e.start = 0; e.start < i.size; e.start += i.erasesize) {
513 ioctl(fd, MEMUNLOCK, &e);
514 if(ioctl(fd, MEMERASE, &e))
515 ERROR("Failed to erase block on %s at 0x%x\n", mtd, e.start);
522 static int ask_user(int argc, char **argv)
524 if ((argc < 2) || strcmp(argv[1], "-y")) {
525 LOG("This will erase all settings and remove any installed packages. Are you sure? [N/y]\n");
526 if (getchar() != 'y')
533 static int handle_rmdir(const char *dir)
536 struct dirent **namelist;
539 n = scandir(dir, &namelist, NULL, NULL);
547 snprintf(file, sizeof(file), "%s%s", dir, namelist[n]->d_name);
548 if (!lstat(file, &s) && !S_ISDIR(s.st_mode)) {
549 DEBUG(1, "unlinking %s\n", file);
556 DEBUG(1, "rmdir %s\n", dir);
562 static int main_jffs2reset(int argc, char **argv)
567 if (ask_user(argc, argv))
570 if (check_fs_exists("overlay")) {
571 ERROR("overlayfs not found\n");
575 if (find_mtd_block("rootfs_data", mtd, sizeof(mtd))) {
576 ERROR("no rootfs_data was found\n");
580 mp = find_mount_point(mtd, "jffs2");
582 LOG("%s is mounted as %s, only ereasing files\n", mtd, mp);
583 foreachdir(mp, handle_rmdir);
584 mount(mp, "/", NULL, MS_REMOUNT, 0);
586 LOG("%s is not mounted, erasing it\n", mtd);
587 find_mtd_char("rootfs_data", mtd, sizeof(mtd));
594 static int main_jffs2mark(int argc, char **argv)
597 __u32 deadc0de = __cpu_to_be32(0xdeadc0de);
601 if (ask_user(argc, argv))
604 if (find_mtd_block("rootfs_data", mtd, sizeof(mtd))) {
605 ERROR("no rootfs_data was found\n");
609 fp = fopen(mtd, "w");
610 LOG("%s - marking with deadc0de\n", mtd);
612 ERROR("opening %s failed\n", mtd);
616 sz = fwrite(&deadc0de, sizeof(deadc0de), 1, fp);
620 ERROR("writing %s failed: %s\n", mtd, strerror(errno));
626 static int main_switch2jffs(int argc, char **argv)
632 if (find_overlay_mount("overlayfs:/tmp/root"))
635 if (check_fs_exists("overlay")) {
636 ERROR("overlayfs not found\n");
640 find_mtd_block("rootfs_data", mtd, sizeof(mtd));
641 mp = find_mount_point(mtd, NULL);
643 LOG("rootfs_data:%s is already mounted as %s\n", mtd, mp);
647 if (find_mtd_char("rootfs_data", mtd, sizeof(mtd))) {
648 ERROR("no rootfs_data was found\n");
652 switch (jffs2_ready(mtd)) {
654 ERROR("no jffs2 marker found\n");
660 DEBUG(1, "doing fo cleanup\n");
661 umount2("/tmp/root", MNT_DETACH);
662 foreachdir("/overlay/", handle_whiteout);
667 ret = mtd_mount_jffs2();
670 if (mount_move("/tmp", "", "/overlay") || fopivot("/overlay", "/rom")) {
671 ERROR("switching to jffs2 failed\n");
680 static int extroot(void)
685 if (stat("/sbin/block", &s))
690 mkdir("/tmp/extroot", 0755);
691 execl("/sbin/block", "/sbin/block", "extroot", NULL);
693 } else if (pid > 0) {
696 waitpid(pid, &status, 0);
697 if (!WEXITSTATUS(status)) {
698 if (find_mount("/tmp/mnt")) {
699 mount("/dev/root", "/", NULL, MS_NOATIME | MS_REMOUNT | MS_RDONLY, 0);
701 mkdir("/tmp/mnt/proc", 0755);
702 mkdir("/tmp/mnt/dev", 0755);
703 mkdir("/tmp/mnt/sys", 0755);
704 mkdir("/tmp/mnt/tmp", 0755);
705 mkdir("/tmp/mnt/rom", 0755);
707 if (mount_move("/tmp", "", "/mnt")) {
708 ERROR("moving pivotroot failed - continue normal boot\n");
710 } else if (pivot("/mnt", "/rom")) {
711 ERROR("switching to pivotroot failed - continue normal boot\n");
716 } else if (find_mount("/tmp/overlay")) {
717 if (mount_move("/tmp", "", "/overlay")) {
718 ERROR("moving extroot failed - continue normal boot\n");
719 umount("/tmp/overlay");
720 } else if (fopivot("/overlay", "/rom")) {
721 ERROR("switching to extroot failed - continue normal boot\n");
732 int main(int argc, char **argv)
737 argv0 = basename(*argv);
739 if (!strcmp(basename(*argv), "jffs2mark"))
740 return main_jffs2mark(argc, argv);
742 if (!strcmp(basename(*argv), "jffs2reset"))
743 return main_jffs2reset(argc, argv);
745 if (!strcmp(basename(*argv), "switch2jffs"))
746 return main_switch2jffs(argc, argv);
748 if (!getenv("PREINIT"))
751 if (find_mtd_char("rootfs_data", mtd, sizeof(mtd))) {
752 if (!find_mtd_char("rootfs", mtd, sizeof(mtd)))
754 LOG("mounting /dev/root\n");
755 mount("/dev/root", "/", NULL, MS_NOATIME | MS_REMOUNT, 0);
758 fprintf(stderr, "mount_root: switched to extroot\n");
762 switch (jffs2_ready(mtd)) {
768 find_mtd_block("rootfs_data", mtd, sizeof(mtd));
769 mp = find_mount_point(mtd, NULL);
771 LOG("rootfs_data:%s is already mounted as %s\n", mtd, mp);
776 DEBUG(1, "switching to jffs2\n");
777 if (mount_move("/tmp", "", "/overlay") || fopivot("/overlay", "/rom")) {
778 ERROR("switching to jffs2 failed - fallback to ramoverlay\n");