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 "../fs-state.h"
31 #include "../driver/volume.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
);
59 if (mkdir("/tmp/overlay", 0755)) {
60 fprintf(stderr
, "failed to mkdir /tmp/overlay: %s\n", strerror(errno
));
64 v
= volume_find("rootfs_data");
66 fprintf(stderr
, "rootfs_data does not exist\n");
70 if (mount(v
->blk
, "/tmp/overlay", "jffs2", MS_NOATIME
, NULL
)) {
71 fprintf(stderr
, "failed to mount -t jffs2 %s /tmp/overlay: %s\n", v
->blk
, strerror(errno
));
75 return volume_init(v
);
81 struct volume
*v
= volume_find("rootfs_data");
85 if (!stat(SWITCH_JFFS2
, &s
)) {
86 fprintf(stderr
, "jffs2 switch already running\n");
91 fprintf(stderr
, "no rootfs_data was found\n");
95 creat("/tmp/.switch_jffs2", 0600);
96 ret
= mount(v
->blk
, "/rom/overlay", "jffs2", MS_NOATIME
, NULL
);
97 unlink("/tmp/.switch_jffs2");
99 fprintf(stderr
, "failed - mount -t jffs2 %s /rom/overlay: %s\n", v
->blk
, strerror(errno
));
103 if (mount("none", "/", NULL
, MS_NOATIME
| MS_REMOUNT
, 0)) {
104 fprintf(stderr
, "failed - mount -o remount,ro none: %s\n", strerror(errno
));
108 system("cp -a /tmp/root/* /rom/overlay");
110 if (pivot("/rom", "/mnt")) {
111 fprintf(stderr
, "failed - pivot /rom /mnt: %s\n", strerror(errno
));
115 if (mount_move("/mnt", "/tmp/root", "")) {
116 fprintf(stderr
, "failed - mount -o move /mnt /tmp/root %s\n", strerror(errno
));
120 return fopivot("/overlay", "/rom");
124 handle_whiteout(const char *dir
)
129 struct dirent
**namelist
;
132 n
= scandir(dir
, &namelist
, NULL
, NULL
);
140 snprintf(file
, sizeof(file
), "%s%s", dir
, namelist
[n
]->d_name
);
141 if (!lstat(file
, &s
) && S_ISLNK(s
.st_mode
)) {
142 sz
= readlink(file
, link
, sizeof(link
) - 1);
147 orig
= strstr(&file
[1], "/");
148 if (orig
&& !strcmp(link
, "(overlay-whiteout)"))
160 ask_user(int argc
, char **argv
)
162 if ((argc
< 2) || strcmp(argv
[1], "-y")) {
163 fprintf(stderr
, "This will erase all settings and remove any installed packages. Are you sure? [N/y]\n");
164 if (getchar() != 'y')
172 handle_rmdir(const char *dir
)
175 struct dirent
**namelist
;
178 n
= scandir(dir
, &namelist
, NULL
, NULL
);
186 snprintf(file
, sizeof(file
), "%s%s", dir
, namelist
[n
]->d_name
);
187 if (!lstat(file
, &s
) && !S_ISDIR(s
.st_mode
))
199 jffs2_reset(int argc
, char **argv
)
204 if (ask_user(argc
, argv
))
207 if (find_filesystem("overlay")) {
208 fprintf(stderr
, "overlayfs not found\n");
212 v
= volume_find("rootfs_data");
214 fprintf(stderr
, "no rootfs_data was found\n");
218 mp
= find_mount_point(v
->blk
, "jffs2");
220 fprintf(stderr
, "%s is mounted as %s, only erasing files\n", v
->blk
, mp
);
221 foreachdir(mp
, handle_rmdir
);
222 mount(mp
, "/", NULL
, MS_REMOUNT
, 0);
224 fprintf(stderr
, "%s is not mounted, erasing it\n", v
->blk
);
232 jffs2_mark(int argc
, char **argv
)
234 __u32 deadc0de
= __cpu_to_be32(0xdeadc0de);
239 if (ask_user(argc
, argv
))
242 v
= volume_find("rootfs_data");
244 fprintf(stderr
, "no rootfs_data was found\n");
248 fd
= open(v
->blk
, O_WRONLY
);
249 fprintf(stderr
, "%s - marking with deadc0de\n", v
->blk
);
251 fprintf(stderr
, "opening %s failed\n", v
->blk
);
255 sz
= write(fd
, &deadc0de
, sizeof(deadc0de
));
259 fprintf(stderr
, "writing %s failed: %s\n", v
->blk
, strerror(errno
));
267 jffs2_switch(int argc
, char **argv
)
273 if (find_overlay_mount("overlayfs:/tmp/root"))
276 if (find_filesystem("overlay")) {
277 fprintf(stderr
, "overlayfs not found\n");
281 v
= volume_find("rootfs_data");
282 mp
= find_mount_point(v
->blk
, NULL
);
284 fprintf(stderr
, "rootfs_data:%s is already mounted as %s\n", v
->blk
, mp
);
288 switch (volume_identify(v
)) {
290 fprintf(stderr
, "no jffs2 marker found\n");
296 fprintf(stderr
, "doing fo cleanup\n");
297 umount2("/tmp/root", MNT_DETACH
);
298 foreachdir("/overlay/", handle_whiteout
);
306 if (mount_move("/tmp", "", "/overlay") || fopivot("/overlay", "/rom")) {
307 fprintf(stderr
, "switching to jffs2 failed\n");
316 static int overlay_mount_fs(void)
320 if (mkdir("/tmp/overlay", 0755)) {
321 fprintf(stderr
, "failed to mkdir /tmp/overlay: %s\n", strerror(errno
));
325 v
= volume_find("rootfs_data");
327 fprintf(stderr
, "rootfs_data does not exist\n");
331 if (mount(v
->blk
, "/tmp/overlay", "jffs2", MS_NOATIME
, NULL
)) {
332 fprintf(stderr
, "failed to mount -t jffs2 %s /tmp/overlay: %s\n",
333 v
->blk
, strerror(errno
));
342 static int overlay_mount(void)
344 struct volume
*v
= volume_find("rootfs_data");;
350 mp
= find_mount_point(v
->blk
, NULL
);
352 fprintf(stderr
, "rootfs_data:%s is already mounted as %s\n", v
->blk
, mp
);
358 extroot_prefix
= "/tmp/overlay";
359 if (!backend_mount("extroot")) {
360 fprintf(stderr
, "fs-state: switched to extroot\n");
364 fprintf(stderr
, "switching to jffs2\n");
365 if (mount_move("/tmp", "", "/overlay") || fopivot("/overlay", "/rom")) {
366 fprintf(stderr
, "switching to jffs2 failed - fallback to ramoverlay\n");
373 static struct backend_handler jffs2_handlers
[] = {
375 .name
= "jffs2reset",
382 static struct backend overlay_backend
= {
384 .num_handlers
= ARRAY_SIZE(jffs2_handlers
),
385 .handlers
= jffs2_handlers
,
386 .mount
= overlay_mount
,
388 BACKEND(overlay_backend
);