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*))
74 if (dir
[strlen(dir
) - 1] == '/')
75 snprintf(globdir
, 256, "%s*", dir
);
77 snprintf(globdir
, 256, "%s/*", dir
); /**/
79 if (!glob(globdir
, GLOB_NOESCAPE
| GLOB_MARK
| GLOB_ONLYDIR
, NULL
, &gl
))
80 for (j
= 0; j
< gl
.gl_pathc
; j
++)
81 foreachdir(gl
.gl_pathv
[j
], cb
);
87 overlay_delete(const char *dir
, bool _keep_sysupgrade
)
89 keep_sysupgrade
= _keep_sysupgrade
;
90 foreachdir(dir
, handle_rmdir
);
94 overlay_mount(struct volume
*v
, char *fs
)
96 if (mkdir("/tmp/overlay", 0755)) {
97 ULOG_ERR("failed to mkdir /tmp/overlay: %s\n", strerror(errno
));
101 if (mount(v
->blk
, "/tmp/overlay", fs
, MS_NOATIME
, NULL
)) {
102 ULOG_ERR("failed to mount -t %s %s /tmp/overlay: %s\n", fs
, v
->blk
, strerror(errno
));
106 return volume_init(v
);
110 switch2jffs(struct volume
*v
)
115 if (!stat(SWITCH_JFFS2
, &s
)) {
116 ULOG_ERR("jffs2 switch already running\n");
120 creat("/tmp/.switch_jffs2", 0600);
121 ret
= mount(v
->blk
, "/rom/overlay", "jffs2", MS_NOATIME
, NULL
);
122 unlink("/tmp/.switch_jffs2");
124 ULOG_ERR("failed - mount -t jffs2 %s /rom/overlay: %s\n", v
->blk
, strerror(errno
));
128 if (mount("none", "/", NULL
, MS_NOATIME
| MS_REMOUNT
, 0)) {
129 ULOG_ERR("failed - mount -o remount,ro none: %s\n", strerror(errno
));
133 if (system("cp -a /tmp/root/* /rom/overlay")) {
134 ULOG_ERR("failed - cp -a /tmp/root/* /rom/overlay: %s\n", strerror(errno
));
138 if (pivot("/rom", "/mnt")) {
139 ULOG_ERR("failed - pivot /rom /mnt: %s\n", strerror(errno
));
143 if (mount_move("/mnt", "/tmp/root", "")) {
144 ULOG_ERR("failed - mount -o move /mnt /tmp/root %s\n", strerror(errno
));
148 return fopivot("/overlay", "/rom");
152 handle_whiteout(const char *dir
)
157 struct dirent
**namelist
;
160 n
= scandir(dir
, &namelist
, NULL
, NULL
);
168 snprintf(file
, sizeof(file
), "%s%s", dir
, namelist
[n
]->d_name
);
169 if (!lstat(file
, &s
) && S_ISLNK(s
.st_mode
)) {
170 sz
= readlink(file
, link
, sizeof(link
) - 1);
175 orig
= strstr(&file
[1], "/");
176 if (orig
&& !strcmp(link
, "(overlay-whiteout)"))
188 jffs2_switch(struct volume
*v
)
193 if (find_overlay_mount("overlayfs:/tmp/root"))
196 if (find_filesystem("overlay")) {
197 ULOG_ERR("overlayfs not supported by kernel\n");
201 mp
= find_mount_point(v
->blk
, 0);
203 ULOG_ERR("rootfs_data:%s is already mounted as %s\n", v
->blk
, mp
);
207 switch (volume_identify(v
)) {
209 ULOG_ERR("no jffs2 marker found\n");
213 ret
= switch2jffs(v
);
215 ULOG_INFO("performing overlay whiteout\n");
216 umount2("/tmp/root", MNT_DETACH
);
217 foreachdir("/overlay/", handle_whiteout
);
222 ret
= overlay_mount(v
, "jffs2");
225 if (mount_move("/tmp", "", "/overlay") || fopivot("/overlay", "/rom")) {
226 ULOG_ERR("switching to jffs2 failed\n");
232 ret
= overlay_mount(v
, "ubifs");
235 if (mount_move("/tmp", "", "/overlay") || fopivot("/overlay", "/rom")) {
236 ULOG_ERR("switching to ubifs failed\n");
246 fs_state_set("/overlay", FS_STATE_READY
);
250 static int overlay_mount_fs(struct volume
*v
)
254 if (mkdir("/tmp/overlay", 0755)) {
255 ULOG_ERR("failed to mkdir /tmp/overlay: %s\n", strerror(errno
));
261 switch (volume_identify(v
)) {
269 if (mount(v
->blk
, "/tmp/overlay", fstype
, MS_NOATIME
, NULL
)) {
270 ULOG_ERR("failed to mount -t %s %s /tmp/overlay: %s\n",
271 fstype
, v
->blk
, strerror(errno
));
278 enum fs_state
fs_state_get(const char *dir
)
285 path
= alloca(strlen(dir
) + 1 + sizeof("/.fs_state"));
286 sprintf(path
, "%s/.fs_state", dir
);
287 len
= readlink(path
, valstr
, sizeof(valstr
) - 1);
289 return FS_STATE_UNKNOWN
;
294 if (val
> __FS_STATE_LAST
)
295 return FS_STATE_UNKNOWN
;
301 int fs_state_set(const char *dir
, enum fs_state state
)
306 path
= alloca(strlen(dir
) + 1 + sizeof("/.fs_state"));
307 sprintf(path
, "%s/.fs_state", dir
);
309 snprintf(valstr
, sizeof(valstr
), "%d", state
);
311 return symlink(valstr
, path
);
315 int mount_overlay(struct volume
*v
)
322 mp
= find_mount_point(v
->blk
, 0);
324 ULOG_ERR("rootfs_data:%s is already mounted as %s\n", v
->blk
, mp
);
330 extroot_prefix
= "/tmp/overlay";
331 if (!mount_extroot()) {
332 ULOG_INFO("switched to extroot\n");
336 switch(fs_state_get("/tmp/overlay")) {
337 case FS_STATE_UNKNOWN
:
338 fs_state_set("/tmp/overlay", FS_STATE_PENDING
);
339 if (fs_state_get("/tmp/overlay") != FS_STATE_PENDING
) {
340 ULOG_ERR("unable to set filesystem state\n");
343 case FS_STATE_PENDING
:
344 ULOG_INFO("overlay filesystem has not been fully initialized yet\n");
345 overlay_delete("/tmp/overlay", true);
351 ULOG_INFO("switching to jffs2 overlay\n");
352 if (mount_move("/tmp", "", "/overlay") || fopivot("/overlay", "/rom")) {
353 ULOG_ERR("switching to jffs2 failed - fallback to ramoverlay\n");