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
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
|
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <inttypes.h>
#include <mtd/ubi-user.h>
#include <poll.h>
#include <signal.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <syslog.h>
#include <sys/random.h>
#include <sys/signalfd.h>
#include <sys/stat.h>
#include <sys/timerfd.h>
#include <sys/types.h>
#include <unistd.h>
#define PROGRAM_NAME "ubihealthd"
#include "libubi.h"
#include "common.h"
#ifndef UBI_IOCRPEB
#define UBI_IOCRPEB _IOW(UBI_IOC_MAGIC, 4, int32_t)
#endif
struct peb_state {
int alive;
int pnum;
int last_errno;
};
static struct peb_state **peb_state_array;
static int peb_state_array_len;
static int cur_pos;
static const char *ubi_device = "/dev/ubi0";
static int ubi_fd;
static int interval_secs = 120;
static int nodaemon;
static const char opt_string[] = "d:i:f";
static const struct option options[] = {
{
.name = "device",
.has_arg = required_argument,
.flag = NULL,
.val = 'd'
},
{
.name = "interval",
.has_arg = required_argument,
.flag = NULL,
.val = 'i'
},
};
static void dolog(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
if (nodaemon)
vfprintf(stderr, fmt, ap);
else
vsyslog(LOG_DAEMON | LOG_WARNING, fmt, ap);
va_end(ap);
}
static void build_peb_list(void)
{
int i, pos;
struct peb_state *ps;
peb_state_array = xmalloc(sizeof(ps) * peb_state_array_len);
for (i = 0; i < peb_state_array_len; i++) {
ps = xmalloc(sizeof(*ps));
ps->pnum = i;
ps->last_errno = 0;
ps->alive = 1;
peb_state_array[i] = ps;
}
/* Shuffle the list */
for (i = 0; i < peb_state_array_len; i++) {
pos = rand() % peb_state_array_len;
ps = peb_state_array[pos];
peb_state_array[pos] = peb_state_array[i];
peb_state_array[i] = ps;
}
}
static struct peb_state *__next_peb(void)
{
struct peb_state *ps = peb_state_array[cur_pos];
cur_pos++;
if (cur_pos >= peb_state_array_len)
cur_pos = 0;
return ps;
}
static struct peb_state *next_peb(void)
{
int i;
struct peb_state *ps;
/* Find next PEB in our list, skip bad PEBs */
for (i = 0; i < peb_state_array_len; i++) {
ps = __next_peb();
if (ps->alive)
return ps;
}
dolog("Fatal: All PEBs are gone?!\n");
exit(1);
return NULL;
}
static int process_one_peb(void)
{
int rc;
struct peb_state *ps = next_peb();
rc = ioctl(ubi_fd, UBI_IOCRPEB, &ps->pnum);
if (!rc)
return 0;
else
rc = errno;
switch (rc) {
case EINVAL: {
dolog("Unable to check PEB %i for unknown reason!\n", ps->pnum);
break;
}
case ENOENT: {
/* UBI ignores this PEB */
ps->alive = 0;
break;
}
case EBUSY: {
if (ps->last_errno == rc)
dolog("Warning: Unable to check PEB %i\n", ps->pnum);
break;
}
case EAGAIN: {
if (ps->last_errno == rc)
dolog("Warning: PEB %i has bitflips, but cannot scrub!\n", ps->pnum);
break;
}
case EUCLEAN: {
/* Scrub happened */
break;
}
case ENOTTY: {
dolog("Fatal: Kernel does not support this interface. Too old kernel?\n");
exit(1);
break;
}
case ENODEV: {
dolog("Fatal: UBI device vanished under us.\n");
exit(1);
}
default:
dolog("Warning: Unknown return code from kernel: %i\n", rc);
}
ps->last_errno = rc;
return 0;
}
static int get_peb_count(void)
{
libubi_t libubi = libubi_open();
struct ubi_dev_info dev_info;
if (!libubi) {
fprintf(stderr, "Unable to init libubi, is UBI present?\n");
exit(1);
}
if (ubi_get_dev_info(libubi, ubi_device, &dev_info)) {
fprintf(stderr, "Fatal: Could not get ubi info for %s\n", ubi_device);
exit(1);
}
libubi_close(libubi);
return dev_info.total_lebs;
}
static void init_prng(void)
{
int ret, seed;
ret = getrandom(&seed, sizeof(seed), 0);
if (ret != sizeof(seed)) {
if (ret == -1)
fprintf(stderr, "Unable to get random seed: %m\n");
else
fprintf(stderr, "Unable to get %zi bytes random seed\n", sizeof(seed));
exit(1);
}
srand(seed);
}
int main (int argc, char *argv[])
{
int c, i;
while ((c = getopt_long(argc, argv, opt_string, options, &i)) != -1) {
switch(c) {
case 'd': {
ubi_device = optarg;
break;
}
case 'i': {
interval_secs = atoi(optarg);
if (!interval_secs) {
fprintf(stderr, "Bad interval value! %s\n", optarg);
exit(1);
}
break;
}
case 'f': {
nodaemon = 1;
break;
}
case '?':
default:
fprintf(stderr, "Usage: %s [ -d UBI_DEVICE ] [-i INTERVAL_SEC ] [ -f ]\n", argv[0]);
exit(1);
break;
}
}
ubi_fd = open(ubi_device, O_RDONLY);
if (ubi_fd == -1) {
fprintf(stderr, "Fatal: Unable to open %s: %m\n", ubi_device);
exit(1);
}
init_prng();
peb_state_array_len = get_peb_count();
build_peb_list();
if (!nodaemon) {
if (daemon(0, 0) == -1) {
fprintf(stderr, "Unable to become a daemon: %m\n");
exit(1);
}
}
for (;;) {
process_one_peb();
sleep(interval_secs);
}
return 0;
}
|
