c5356931cceb4007a62164caca60b88b838585a8
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 system("cp -a /tmp/root/* /rom/overlay"); /**/
135 if (pivot("/rom", "/mnt")) {
136 ULOG_ERR("failed - pivot /rom /mnt: %s\n", strerror(errno
));
140 if (mount_move("/mnt", "/tmp/root", "")) {
141 ULOG_ERR("failed - mount -o move /mnt /tmp/root %s\n", strerror(errno
));
145 return fopivot("/overlay", "/rom");
149 handle_whiteout(const char *dir
)
154 struct dirent
**namelist
;
157 n
= scandir(dir
, &namelist
, NULL
, NULL
);
165 snprintf(file
, sizeof(file
), "%s%s", dir
, namelist
[n
]->d_name
);
166 if (!lstat(file
, &s
) && S_ISLNK(s
.st_mode
)) {
167 sz
= readlink(file
, link
, sizeof(link
) - 1);
172 orig
= strstr(&file
[1], "/");
173 if (orig
&& !strcmp(link
, "(overlay-whiteout)"))
185 jffs2_switch(struct volume
*v
)
190 if (find_overlay_mount("overlayfs:/tmp/root"))
193 if (find_filesystem("overlay")) {
194 ULOG_ERR("overlayfs not supported by kernel\n");
198 mp
= find_mount_point(v
->blk
, 0);
200 ULOG_ERR("rootfs_data:%s is already mounted as %s\n", v
->blk
, mp
);
204 switch (volume_identify(v
)) {
206 ULOG_ERR("no jffs2 marker found\n");
210 ret
= switch2jffs(v
);
212 ULOG_INFO("performing overlay whiteout\n");
213 umount2("/tmp/root", MNT_DETACH
);
214 foreachdir("/overlay/", handle_whiteout
);
219 ret
= overlay_mount(v
, "jffs2");
222 if (mount_move("/tmp", "", "/overlay") || fopivot("/overlay", "/rom")) {
223 ULOG_ERR("switching to jffs2 failed\n");
229 ret
= overlay_mount(v
, "ubifs");
232 if (mount_move("/tmp", "", "/overlay") || fopivot("/overlay", "/rom")) {
233 ULOG_ERR("switching to ubifs failed\n");
241 static int overlay_mount_fs(struct volume
*v
)
245 if (mkdir("/tmp/overlay", 0755)) {
246 ULOG_ERR("failed to mkdir /tmp/overlay: %s\n", strerror(errno
));
252 switch (volume_identify(v
)) {
258 if (mount(v
->blk
, "/tmp/overlay", fstype
, MS_NOATIME
, NULL
)) {
259 ULOG_ERR("failed to mount -t %s %s /tmp/overlay: %s\n",
260 fstype
, v
->blk
, strerror(errno
));
269 int mount_overlay(struct volume
*v
)
276 mp
= find_mount_point(v
->blk
, 0);
278 ULOG_ERR("rootfs_data:%s is already mounted as %s\n", v
->blk
, mp
);
284 extroot_prefix
= "/tmp/overlay";
285 if (!mount_extroot()) {
286 ULOG_INFO("switched to extroot\n");
290 ULOG_INFO("switching to jffs2 overlay\n");
291 if (mount_move("/tmp", "", "/overlay") || fopivot("/overlay", "/rom")) {
292 ULOG_ERR("switching to jffs2 failed - fallback to ramoverlay\n");