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");
192 ret
= overlay_mount(v
, "ubifs");
195 if (mount_move("/tmp", "", "/overlay") || fopivot("/overlay", "/rom")) {
196 fprintf(stderr
, "switching to ubifs failed\n");
204 static int overlay_mount_fs(void)
209 if (mkdir("/tmp/overlay", 0755)) {
210 fprintf(stderr
, "failed to mkdir /tmp/overlay: %s\n", strerror(errno
));
214 v
= volume_find("rootfs_data");
216 fprintf(stderr
, "rootfs_data does not exist\n");
222 switch (volume_identify(v
)) {
228 if (mount(v
->blk
, "/tmp/overlay", fstype
, MS_NOATIME
, NULL
)) {
229 fprintf(stderr
, "failed to mount -t %s %s /tmp/overlay: %s\n",
230 fstype
, v
->blk
, strerror(errno
));
239 int mount_overlay(void)
241 struct volume
*v
= volume_find("rootfs_data");;
247 mp
= find_mount_point(v
->blk
, NULL
);
249 fprintf(stderr
, "rootfs_data:%s is already mounted as %s\n", v
->blk
, mp
);
255 extroot_prefix
= "/tmp/overlay";
256 if (!mount_extroot()) {
257 fprintf(stderr
, "switched to extroot\n");
261 fprintf(stderr
, "switching to overlay\n");
262 if (mount_move("/tmp", "", "/overlay") || fopivot("/overlay", "/rom")) {
263 fprintf(stderr
, "switching to jffs2 failed - fallback to ramoverlay\n");