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"
35 static bool keep_sysupgrade;
38 handle_rmdir(const char *dir)
51 while ((dt = readdir(d)) != NULL) {
52 if (fstatat(fd, dt->d_name, &st, AT_SYMLINK_NOFOLLOW) || S_ISDIR(st.st_mode))
55 if (keep_sysupgrade && !strcmp(dt->d_name, "sysupgrade.tgz"))
58 unlinkat(fd, dt->d_name, 0);
68 foreachdir(const char *dir, int (*cb)(const char*))
70 struct stat s = { 0 };
75 if (dir[strlen(dir) - 1] == '/')
76 snprintf(globdir, 256, "%s*", dir);
78 snprintf(globdir, 256, "%s/*", dir); /**/
80 if (!glob(globdir, GLOB_NOESCAPE | GLOB_MARK | GLOB_ONLYDIR, NULL, &gl))
81 for (j = 0; j < gl.gl_pathc; j++) {
82 char *dir = gl.gl_pathv[j];
83 int len = strlen(gl.gl_pathv[j]);
85 if (len > 1 && dir[len - 1] == '/')
88 if (!lstat(gl.gl_pathv[j], &s) && !S_ISLNK(s.st_mode))
89 foreachdir(gl.gl_pathv[j], cb);
95 overlay_delete(const char *dir, bool _keep_sysupgrade)
97 keep_sysupgrade = _keep_sysupgrade;
98 foreachdir(dir, handle_rmdir);
102 overlay_mount(struct volume *v, char *fs)
104 if (mkdir("/tmp/overlay", 0755)) {
105 ULOG_ERR("failed to mkdir /tmp/overlay: %s\n", strerror(errno));
109 if (mount(v->blk, "/tmp/overlay", fs, MS_NOATIME, NULL)) {
110 ULOG_ERR("failed to mount -t %s %s /tmp/overlay: %s\n", fs, v->blk, strerror(errno));
114 return volume_init(v);
118 switch2jffs(struct volume *v)
123 if (!stat(SWITCH_JFFS2, &s)) {
124 ULOG_ERR("jffs2 switch already running\n");
128 creat("/tmp/.switch_jffs2", 0600);
129 ret = mount(v->blk, "/rom/overlay", "jffs2", MS_NOATIME, NULL);
130 unlink("/tmp/.switch_jffs2");
132 ULOG_ERR("failed - mount -t jffs2 %s /rom/overlay: %s\n", v->blk, strerror(errno));
136 if (mount("none", "/", NULL, MS_NOATIME | MS_REMOUNT, 0)) {
137 ULOG_ERR("failed - mount -o remount,ro none: %s\n", strerror(errno));
141 if (system("cp -a /tmp/root/* /rom/overlay")) {
142 ULOG_ERR("failed - cp -a /tmp/root/* /rom/overlay: %s\n", strerror(errno));
146 if (pivot("/rom", "/mnt")) {
147 ULOG_ERR("failed - pivot /rom /mnt: %s\n", strerror(errno));
151 if (mount_move("/mnt", "/tmp/root", "")) {
152 ULOG_ERR("failed - mount -o move /mnt /tmp/root %s\n", strerror(errno));
156 return fopivot("/overlay", "/rom");
160 handle_whiteout(const char *dir)
165 struct dirent **namelist;
168 n = scandir(dir, &namelist, NULL, NULL);
176 snprintf(file, sizeof(file), "%s%s", dir, namelist[n]->d_name);
177 if (!lstat(file, &s) && S_ISLNK(s.st_mode)) {
178 sz = readlink(file, link, sizeof(link) - 1);
183 orig = strstr(&file[1], "/");
184 if (orig && !strcmp(link, "(overlay-whiteout)"))
196 jffs2_switch(struct volume *v)
201 if (find_overlay_mount("overlayfs:/tmp/root"))
204 if (find_filesystem("overlay")) {
205 ULOG_ERR("overlayfs not supported by kernel\n");
209 mp = find_mount_point(v->blk, 0);
211 ULOG_ERR("rootfs_data:%s is already mounted as %s\n", v->blk, mp);
215 switch (volume_identify(v)) {
217 ULOG_ERR("no jffs2 marker found\n");
221 ret = switch2jffs(v);
223 ULOG_INFO("performing overlay whiteout\n");
224 umount2("/tmp/root", MNT_DETACH);
225 foreachdir("/overlay/", handle_whiteout);
230 ret = overlay_mount(v, "jffs2");
233 if (mount_move("/tmp", "", "/overlay") || fopivot("/overlay", "/rom")) {
234 ULOG_ERR("switching to jffs2 failed\n");
240 ret = overlay_mount(v, "ubifs");
243 if (mount_move("/tmp", "", "/overlay") || fopivot("/overlay", "/rom")) {
244 ULOG_ERR("switching to ubifs failed\n");
254 fs_state_set("/overlay", FS_STATE_READY);
258 static int overlay_mount_fs(struct volume *v)
262 if (mkdir("/tmp/overlay", 0755)) {
263 ULOG_ERR("failed to mkdir /tmp/overlay: %s\n", strerror(errno));
269 switch (volume_identify(v)) {
277 if (mount(v->blk, "/tmp/overlay", fstype, MS_NOATIME, NULL)) {
278 ULOG_ERR("failed to mount -t %s %s /tmp/overlay: %s\n",
279 fstype, v->blk, strerror(errno));
286 enum fs_state fs_state_get(const char *dir)
293 path = alloca(strlen(dir) + 1 + sizeof("/.fs_state"));
294 sprintf(path, "%s/.fs_state", dir);
295 len = readlink(path, valstr, sizeof(valstr) - 1);
297 return FS_STATE_UNKNOWN;
302 if (val > __FS_STATE_LAST)
303 return FS_STATE_UNKNOWN;
309 int fs_state_set(const char *dir, enum fs_state state)
314 if (fs_state_get(dir) == state)
317 path = alloca(strlen(dir) + 1 + sizeof("/.fs_state"));
318 sprintf(path, "%s/.fs_state", dir);
320 snprintf(valstr, sizeof(valstr), "%d", state);
322 return symlink(valstr, path);
326 int mount_overlay(struct volume *v)
333 mp = find_mount_point(v->blk, 0);
335 ULOG_ERR("rootfs_data:%s is already mounted as %s\n", v->blk, mp);
341 extroot_prefix = "/tmp/overlay";
342 if (!mount_extroot()) {
343 ULOG_INFO("switched to extroot\n");
347 switch(fs_state_get("/tmp/overlay")) {
348 case FS_STATE_UNKNOWN:
349 fs_state_set("/tmp/overlay", FS_STATE_PENDING);
350 if (fs_state_get("/tmp/overlay") != FS_STATE_PENDING) {
351 ULOG_ERR("unable to set filesystem state\n");
354 case FS_STATE_PENDING:
355 ULOG_INFO("overlay filesystem has not been fully initialized yet\n");
356 overlay_delete("/tmp/overlay", true);
362 ULOG_INFO("switching to jffs2 overlay\n");
363 if (mount_move("/tmp", "", "/overlay") || fopivot("/overlay", "/rom")) {
364 ULOG_ERR("switching to jffs2 failed - fallback to ramoverlay\n");