1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
/*
* Copyright (C) 2014 John Crispin <blogic@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <sys/mount.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <libubox/ulog.h>
#include "libfstools/libfstools.h"
#include "libfstools/volume.h"
/*
* Called in the early (PREINIT) stage, when we immediately need some writable
* filesystem.
*/
static int
start(int argc, char *argv[1])
{
struct volume *root;
struct volume *data = volume_find("rootfs_data");
struct stat s;
if (!getenv("PREINIT") && stat("/tmp/.preinit", &s))
return -1;
if (!data) {
root = volume_find("rootfs");
volume_init(root);
ULOG_NOTE("mounting /dev/root\n");
mount("/dev/root", "/", NULL, MS_NOATIME | MS_REMOUNT, 0);
}
/* Check for extroot config in rootfs before even trying rootfs_data */
if (!mount_extroot("")) {
ULOG_NOTE("switched to extroot\n");
return 0;
}
/* There isn't extroot, so just try to mount "rootfs_data" */
volume_init(data);
switch (volume_identify(data)) {
case FS_NONE:
ULOG_WARN("no usable overlay filesystem found, using tmpfs overlay\n");
return ramoverlay();
case FS_DEADCODE:
/*
* Filesystem isn't ready yet and we are in the preinit, so we
* can't afford waiting for it. Use tmpfs for now and handle it
* properly in the "done" call.
*/
ULOG_NOTE("jffs2 not ready yet, using temporary tmpfs overlay\n");
return ramoverlay();
case FS_EXT4:
case FS_F2FS:
case FS_JFFS2:
case FS_UBIFS:
mount_overlay(data);
break;
case FS_SNAPSHOT:
mount_snapshot(data);
break;
}
return 0;
}
static int
stop(int argc, char *argv[1])
{
if (!getenv("SHUTDOWN"))
return -1;
return 0;
}
/*
* Called at the end of init, it can wait for filesystem if needed.
*/
static int
done(int argc, char *argv[1])
{
struct volume *v = volume_find("rootfs_data");
if (!v)
return -1;
switch (volume_identify(v)) {
case FS_NONE:
case FS_DEADCODE:
return jffs2_switch(v);
case FS_EXT4:
case FS_F2FS:
case FS_JFFS2:
case FS_UBIFS:
fs_state_set("/overlay", FS_STATE_READY);
break;
}
return 0;
}
int main(int argc, char **argv)
{
if (argc < 2)
return start(argc, argv);
if (!strcmp(argv[1], "ram"))
return ramoverlay();
if (!strcmp(argv[1], "stop"))
return stop(argc, argv);
if (!strcmp(argv[1], "done"))
return done(argc, argv);
return -1;
}
|
