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block: support /dev/xvd* nodes
[project/fstools.git] / block.c
1 /*
2 * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
3 * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU Lesser General Public License version 2.1
7 * as published by the Free Software Foundation
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14
15 #define _GNU_SOURCE
16 #include <getopt.h>
17 #include <stdio.h>
18 #include <unistd.h>
19 #include <syslog.h>
20 #include <libgen.h>
21 #include <glob.h>
22 #include <dirent.h>
23 #include <stdarg.h>
24 #include <string.h>
25 #include <errno.h>
26 #include <fcntl.h>
27 #include <limits.h>
28
29 #include <sys/stat.h>
30 #include <sys/types.h>
31 #include <sys/swap.h>
32 #include <sys/mount.h>
33 #include <sys/wait.h>
34 #include <sys/sysmacros.h>
35
36 #include <linux/fs.h>
37
38 #include <uci.h>
39 #include <uci_blob.h>
40
41 #include <libubox/ulog.h>
42 #include <libubox/list.h>
43 #include <libubox/vlist.h>
44 #include <libubox/blobmsg_json.h>
45 #include <libubox/avl-cmp.h>
46 #include <libubus.h>
47
48 #include "probe.h"
49
50 #define AUTOFS_MOUNT_PATH "/tmp/run/blockd/"
51
52 #ifdef UBIFS_EXTROOT
53 #include "libubi/libubi.h"
54 #endif
55
56 enum {
57 TYPE_MOUNT,
58 TYPE_SWAP,
59 };
60
61 enum {
62 TYPE_DEV,
63 TYPE_HOTPLUG,
64 TYPE_AUTOFS,
65 };
66
67 struct mount {
68 struct vlist_node node;
69 int type;
70
71 char *target;
72 char *path;
73 char *options;
74 uint32_t flags;
75 char *uuid;
76 char *label;
77 char *device;
78 int extroot;
79 int autofs;
80 int overlay;
81 int disabled_fsck;
82 unsigned int prio;
83 };
84
85 static struct vlist_tree mounts;
86 static struct blob_buf b;
87 static LIST_HEAD(devices);
88 static int anon_mount, anon_swap, auto_mount, auto_swap, check_fs;
89 static unsigned int delay_root;
90
91 enum {
92 CFG_ANON_MOUNT,
93 CFG_ANON_SWAP,
94 CFG_AUTO_MOUNT,
95 CFG_AUTO_SWAP,
96 CFG_DELAY_ROOT,
97 CFG_CHECK_FS,
98 __CFG_MAX
99 };
100
101 static const struct blobmsg_policy config_policy[__CFG_MAX] = {
102 [CFG_ANON_SWAP] = { .name = "anon_swap", .type = BLOBMSG_TYPE_INT32 },
103 [CFG_ANON_MOUNT] = { .name = "anon_mount", .type = BLOBMSG_TYPE_INT32 },
104 [CFG_AUTO_SWAP] = { .name = "auto_swap", .type = BLOBMSG_TYPE_INT32 },
105 [CFG_AUTO_MOUNT] = { .name = "auto_mount", .type = BLOBMSG_TYPE_INT32 },
106 [CFG_DELAY_ROOT] = { .name = "delay_root", .type = BLOBMSG_TYPE_INT32 },
107 [CFG_CHECK_FS] = { .name = "check_fs", .type = BLOBMSG_TYPE_INT32 },
108 };
109
110 enum {
111 MOUNT_UUID,
112 MOUNT_LABEL,
113 MOUNT_ENABLE,
114 MOUNT_TARGET,
115 MOUNT_DEVICE,
116 MOUNT_OPTIONS,
117 MOUNT_AUTOFS,
118 __MOUNT_MAX
119 };
120
121 static const struct uci_blob_param_list config_attr_list = {
122 .n_params = __CFG_MAX,
123 .params = config_policy,
124 };
125
126 static const struct blobmsg_policy mount_policy[__MOUNT_MAX] = {
127 [MOUNT_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
128 [MOUNT_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
129 [MOUNT_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
130 [MOUNT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
131 [MOUNT_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_STRING },
132 [MOUNT_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
133 [MOUNT_AUTOFS] = { .name = "autofs", .type = BLOBMSG_TYPE_INT32 },
134 };
135
136 static const struct uci_blob_param_list mount_attr_list = {
137 .n_params = __MOUNT_MAX,
138 .params = mount_policy,
139 };
140
141 enum {
142 SWAP_ENABLE,
143 SWAP_UUID,
144 SWAP_LABEL,
145 SWAP_DEVICE,
146 SWAP_PRIO,
147 __SWAP_MAX
148 };
149
150 static const struct blobmsg_policy swap_policy[__SWAP_MAX] = {
151 [SWAP_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
152 [SWAP_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
153 [SWAP_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
154 [SWAP_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
155 [SWAP_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 },
156 };
157
158 static const struct uci_blob_param_list swap_attr_list = {
159 .n_params = __SWAP_MAX,
160 .params = swap_policy,
161 };
162
163 struct mount_flag {
164 const char *name;
165 int32_t flag;
166 };
167
168 static const struct mount_flag mount_flags[] = {
169 { "sync", MS_SYNCHRONOUS },
170 { "async", ~MS_SYNCHRONOUS },
171 { "dirsync", MS_DIRSYNC },
172 { "mand", MS_MANDLOCK },
173 { "nomand", ~MS_MANDLOCK },
174 { "atime", ~MS_NOATIME },
175 { "noatime", MS_NOATIME },
176 { "dev", ~MS_NODEV },
177 { "nodev", MS_NODEV },
178 { "diratime", ~MS_NODIRATIME },
179 { "nodiratime", MS_NODIRATIME },
180 { "exec", ~MS_NOEXEC },
181 { "noexec", MS_NOEXEC },
182 { "suid", ~MS_NOSUID },
183 { "nosuid", MS_NOSUID },
184 { "rw", ~MS_RDONLY },
185 { "ro", MS_RDONLY },
186 { "relatime", MS_RELATIME },
187 { "norelatime", ~MS_RELATIME },
188 { "strictatime", MS_STRICTATIME },
189 { "acl", MS_POSIXACL },
190 { "noacl", ~MS_POSIXACL },
191 { "nouser_xattr", MS_NOUSER },
192 { "user_xattr", ~MS_NOUSER },
193 };
194
195 static char *blobmsg_get_strdup(struct blob_attr *attr)
196 {
197 if (!attr)
198 return NULL;
199
200 return strdup(blobmsg_get_string(attr));
201 }
202
203 static char *blobmsg_get_basename(struct blob_attr *attr)
204 {
205 if (!attr)
206 return NULL;
207
208 return strdup(basename(blobmsg_get_string(attr)));
209 }
210
211 static void parse_mount_options(struct mount *m, char *optstr)
212 {
213 int i;
214 bool is_flag;
215 char *p, *opts, *last;
216
217 m->flags = 0;
218 m->options = NULL;
219
220 if (!optstr || !*optstr)
221 return;
222
223 m->options = opts = calloc(1, strlen(optstr) + 1);
224
225 if (!m->options)
226 return;
227
228 p = last = optstr;
229
230 do {
231 p = strchr(p, ',');
232
233 if (p)
234 *p++ = 0;
235
236 for (i = 0, is_flag = false; i < ARRAY_SIZE(mount_flags); i++) {
237 if (!strcmp(last, mount_flags[i].name)) {
238 if (mount_flags[i].flag < 0)
239 m->flags &= (uint32_t)mount_flags[i].flag;
240 else
241 m->flags |= (uint32_t)mount_flags[i].flag;
242 is_flag = true;
243 break;
244 }
245 }
246
247 if (!is_flag)
248 opts += sprintf(opts, "%s%s", (opts > m->options) ? "," : "", last);
249
250 last = p;
251
252 } while (p);
253
254 free(optstr);
255 }
256
257 static int mount_add(struct uci_section *s)
258 {
259 struct blob_attr *tb[__MOUNT_MAX] = { 0 };
260 struct mount *m;
261
262 blob_buf_init(&b, 0);
263 uci_to_blob(&b, s, &mount_attr_list);
264 blobmsg_parse(mount_policy, __MOUNT_MAX, tb, blob_data(b.head), blob_len(b.head));
265
266 if (!tb[MOUNT_LABEL] && !tb[MOUNT_UUID] && !tb[MOUNT_DEVICE])
267 return -1;
268
269 if (tb[MOUNT_ENABLE] && !blobmsg_get_u32(tb[MOUNT_ENABLE]))
270 return -1;
271
272 m = malloc(sizeof(struct mount));
273 m->type = TYPE_MOUNT;
274 m->uuid = blobmsg_get_strdup(tb[MOUNT_UUID]);
275 m->label = blobmsg_get_strdup(tb[MOUNT_LABEL]);
276 m->target = blobmsg_get_strdup(tb[MOUNT_TARGET]);
277 m->device = blobmsg_get_basename(tb[MOUNT_DEVICE]);
278 if (tb[MOUNT_AUTOFS])
279 m->autofs = blobmsg_get_u32(tb[MOUNT_AUTOFS]);
280 else
281 m->autofs = 0;
282 parse_mount_options(m, blobmsg_get_strdup(tb[MOUNT_OPTIONS]));
283
284 m->overlay = m->extroot = 0;
285 if (m->target && !strcmp(m->target, "/"))
286 m->extroot = 1;
287 if (m->target && !strcmp(m->target, "/overlay"))
288 m->extroot = m->overlay = 1;
289
290 if (m->target && *m->target != '/') {
291 ULOG_WARN("ignoring mount section %s due to invalid target '%s'\n",
292 s->e.name, m->target);
293 free(m);
294 return -1;
295 }
296
297 if (m->uuid)
298 vlist_add(&mounts, &m->node, m->uuid);
299 else if (m->label)
300 vlist_add(&mounts, &m->node, m->label);
301 else if (m->device)
302 vlist_add(&mounts, &m->node, m->device);
303
304 return 0;
305 }
306
307 static int swap_add(struct uci_section *s)
308 {
309 struct blob_attr *tb[__SWAP_MAX] = { 0 };
310 struct mount *m;
311
312 blob_buf_init(&b, 0);
313 uci_to_blob(&b, s, &swap_attr_list);
314 blobmsg_parse(swap_policy, __SWAP_MAX, tb, blob_data(b.head), blob_len(b.head));
315
316 if (!tb[SWAP_UUID] && !tb[SWAP_LABEL] && !tb[SWAP_DEVICE])
317 return -1;
318
319 m = malloc(sizeof(struct mount));
320 memset(m, 0, sizeof(struct mount));
321 m->type = TYPE_SWAP;
322 m->uuid = blobmsg_get_strdup(tb[SWAP_UUID]);
323 m->label = blobmsg_get_strdup(tb[SWAP_LABEL]);
324 m->device = blobmsg_get_basename(tb[SWAP_DEVICE]);
325 if (tb[SWAP_PRIO])
326 m->prio = blobmsg_get_u32(tb[SWAP_PRIO]);
327 if (m->prio)
328 m->prio = ((m->prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
329
330 if ((!tb[SWAP_ENABLE]) || blobmsg_get_u32(tb[SWAP_ENABLE])) {
331 /* store complete swap path */
332 if (tb[SWAP_DEVICE])
333 m->target = blobmsg_get_strdup(tb[SWAP_DEVICE]);
334
335 if (m->uuid)
336 vlist_add(&mounts, &m->node, m->uuid);
337 else if (m->label)
338 vlist_add(&mounts, &m->node, m->label);
339 else if (m->device)
340 vlist_add(&mounts, &m->node, m->device);
341 }
342
343 return 0;
344 }
345
346 static int global_add(struct uci_section *s)
347 {
348 struct blob_attr *tb[__CFG_MAX] = { 0 };
349
350 blob_buf_init(&b, 0);
351 uci_to_blob(&b, s, &config_attr_list);
352 blobmsg_parse(config_policy, __CFG_MAX, tb, blob_data(b.head), blob_len(b.head));
353
354 if ((tb[CFG_ANON_MOUNT]) && blobmsg_get_u32(tb[CFG_ANON_MOUNT]))
355 anon_mount = 1;
356 if ((tb[CFG_ANON_SWAP]) && blobmsg_get_u32(tb[CFG_ANON_SWAP]))
357 anon_swap = 1;
358
359 if ((tb[CFG_AUTO_MOUNT]) && blobmsg_get_u32(tb[CFG_AUTO_MOUNT]))
360 auto_mount = 1;
361 if ((tb[CFG_AUTO_SWAP]) && blobmsg_get_u32(tb[CFG_AUTO_SWAP]))
362 auto_swap = 1;
363
364 if (tb[CFG_DELAY_ROOT])
365 delay_root = blobmsg_get_u32(tb[CFG_DELAY_ROOT]);
366
367 if ((tb[CFG_CHECK_FS]) && blobmsg_get_u32(tb[CFG_CHECK_FS]))
368 check_fs = 1;
369
370 return 0;
371 }
372
373 static struct mount* find_swap(const char *uuid, const char *label, const char *device)
374 {
375 struct mount *m;
376
377 vlist_for_each_element(&mounts, m, node) {
378 if (m->type != TYPE_SWAP)
379 continue;
380 if (uuid && m->uuid && !strcasecmp(m->uuid, uuid))
381 return m;
382 if (label && m->label && !strcmp(m->label, label))
383 return m;
384 if (device && m->device && !strcmp(m->device, device))
385 return m;
386 }
387
388 return NULL;
389 }
390
391 static struct mount* find_block(const char *uuid, const char *label, const char *device,
392 const char *target)
393 {
394 struct mount *m;
395
396 vlist_for_each_element(&mounts, m, node) {
397 if (m->type != TYPE_MOUNT)
398 continue;
399 if (m->uuid && uuid && !strcasecmp(m->uuid, uuid))
400 return m;
401 if (m->label && label && !strcmp(m->label, label))
402 return m;
403 if (m->target && target && !strcmp(m->target, target))
404 return m;
405 if (m->device && device && !strcmp(m->device, device))
406 return m;
407 }
408
409 return NULL;
410 }
411
412 static void mounts_update(struct vlist_tree *tree, struct vlist_node *node_new,
413 struct vlist_node *node_old)
414 {
415 }
416
417 static struct uci_package * config_try_load(struct uci_context *ctx, char *path)
418 {
419 char *file = basename(path);
420 char *dir = dirname(path);
421 char *err;
422 struct uci_package *pkg;
423
424 uci_set_confdir(ctx, dir);
425 ULOG_INFO("attempting to load %s/%s\n", dir, file);
426
427 if (uci_load(ctx, file, &pkg)) {
428 uci_get_errorstr(ctx, &err, file);
429 ULOG_ERR("unable to load configuration (%s)\n", err);
430
431 free(err);
432 return NULL;
433 }
434
435 return pkg;
436 }
437
438 static int config_load(char *cfg)
439 {
440 struct uci_context *ctx = uci_alloc_context();
441 struct uci_package *pkg = NULL;
442 struct uci_element *e;
443 char path[64];
444
445 vlist_init(&mounts, avl_strcmp, mounts_update);
446
447 if (cfg) {
448 snprintf(path, sizeof(path), "%s/upper/etc/config/fstab", cfg);
449 pkg = config_try_load(ctx, path);
450
451 if (!pkg) {
452 snprintf(path, sizeof(path), "%s/etc/config/fstab", cfg);
453 pkg = config_try_load(ctx, path);
454 }
455 }
456
457 if (!pkg) {
458 snprintf(path, sizeof(path), "/etc/config/fstab");
459 pkg = config_try_load(ctx, path);
460 }
461
462 if (!pkg) {
463 ULOG_ERR("no usable configuration\n");
464 return -1;
465 }
466
467 vlist_update(&mounts);
468 uci_foreach_element(&pkg->sections, e) {
469 struct uci_section *s = uci_to_section(e);
470
471 if (!strcmp(s->type, "mount"))
472 mount_add(s);
473 if (!strcmp(s->type, "swap"))
474 swap_add(s);
475 if (!strcmp(s->type, "global"))
476 global_add(s);
477 }
478 vlist_flush(&mounts);
479
480 return 0;
481 }
482
483 static struct probe_info* _probe_path(char *path)
484 {
485 struct probe_info *pr;
486 char tmppath[64];
487
488 /* skip ubi device if ubiblock device is present */
489 if (path[5] == 'u' && path[6] == 'b' && path[7] == 'i' &&
490 path[8] >= '0' && path[8] <= '9' ) {
491 snprintf(tmppath, sizeof(tmppath), "/dev/ubiblock%s", path + 8);
492 list_for_each_entry(pr, &devices, list)
493 if (!strcasecmp(pr->dev, tmppath))
494 return NULL;
495 }
496
497 return probe_path(path);
498 }
499
500 static int _cache_load(const char *path)
501 {
502 int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
503 int j;
504 glob_t gl;
505
506 if (glob(path, gl_flags, NULL, &gl) < 0)
507 return -1;
508
509 for (j = 0; j < gl.gl_pathc; j++) {
510 struct probe_info *pr = _probe_path(gl.gl_pathv[j]);
511 if (pr)
512 list_add_tail(&pr->list, &devices);
513 }
514
515 globfree(&gl);
516
517 return 0;
518 }
519
520 static void cache_load(int mtd)
521 {
522 if (mtd) {
523 _cache_load("/dev/mtdblock*");
524 _cache_load("/dev/ubiblock*");
525 _cache_load("/dev/ubi[0-9]*");
526 }
527 _cache_load("/dev/loop*");
528 _cache_load("/dev/mmcblk*");
529 _cache_load("/dev/sd*");
530 _cache_load("/dev/hd*");
531 _cache_load("/dev/md*");
532 _cache_load("/dev/vd*");
533 _cache_load("/dev/xvd*");
534 _cache_load("/dev/mapper/*");
535 }
536
537
538 static int print_block_uci(struct probe_info *pr)
539 {
540 if (!strcmp(pr->type, "swap")) {
541 printf("config 'swap'\n");
542 } else {
543 printf("config 'mount'\n");
544 printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev));
545 }
546 if (pr->uuid)
547 printf("\toption\tuuid\t'%s'\n", pr->uuid);
548 else
549 printf("\toption\tdevice\t'%s'\n", pr->dev);
550 printf("\toption\tenabled\t'0'\n\n");
551
552 return 0;
553 }
554
555 static struct probe_info* find_block_info(char *uuid, char *label, char *path)
556 {
557 struct probe_info *pr = NULL;
558
559 if (uuid)
560 list_for_each_entry(pr, &devices, list)
561 if (pr->uuid && !strcasecmp(pr->uuid, uuid))
562 return pr;
563
564 if (label)
565 list_for_each_entry(pr, &devices, list)
566 if (pr->label && !strcmp(pr->label, label))
567 return pr;
568
569 if (path)
570 list_for_each_entry(pr, &devices, list)
571 if (pr->dev && !strcmp(basename(pr->dev), basename(path)))
572 return pr;
573
574 return NULL;
575 }
576
577 static char* find_mount_point(char *block)
578 {
579 FILE *fp = fopen("/proc/self/mountinfo", "r");
580 static char line[256];
581 int len = strlen(block);
582 char *point = NULL, *pos, *tmp, *cpoint, *devname;
583 struct stat s;
584 int rstat;
585 unsigned int minor, major;
586
587 if (!fp)
588 return NULL;
589
590 rstat = stat(block, &s);
591
592 while (fgets(line, sizeof(line), fp)) {
593 pos = strchr(line, ' ');
594 if (!pos)
595 continue;
596
597 pos = strchr(pos + 1, ' ');
598 if (!pos)
599 continue;
600
601 tmp = ++pos;
602 pos = strchr(pos, ':');
603 if (!pos)
604 continue;
605
606 *pos = '\0';
607 major = atoi(tmp);
608 tmp = ++pos;
609 pos = strchr(pos, ' ');
610 if (!pos)
611 continue;
612
613 *pos = '\0';
614 minor = atoi(tmp);
615 pos = strchr(pos + 1, ' ');
616 if (!pos)
617 continue;
618 tmp = ++pos;
619
620 pos = strchr(pos, ' ');
621 if (!pos)
622 continue;
623 *pos = '\0';
624 cpoint = tmp;
625
626 pos = strchr(pos + 1, ' ');
627 if (!pos)
628 continue;
629
630 pos = strchr(pos + 1, ' ');
631 if (!pos)
632 continue;
633
634 pos = strchr(pos + 1, ' ');
635 if (!pos)
636 continue;
637
638 tmp = ++pos;
639 pos = strchr(pos, ' ');
640 if (!pos)
641 continue;
642
643 *pos = '\0';
644 devname = tmp;
645 if (!strncmp(block, devname, len)) {
646 point = strdup(cpoint);
647 break;
648 }
649
650 if (rstat)
651 continue;
652
653 if (!S_ISBLK(s.st_mode))
654 continue;
655
656 if (major == major(s.st_rdev) &&
657 minor == minor(s.st_rdev)) {
658 point = strdup(cpoint);
659 break;
660 }
661 }
662
663 fclose(fp);
664
665 return point;
666 }
667
668 static int print_block_info(struct probe_info *pr)
669 {
670 static char *mp;
671
672 mp = find_mount_point(pr->dev);
673 printf("%s:", pr->dev);
674 if (pr->uuid)
675 printf(" UUID=\"%s\"", pr->uuid);
676
677 if (pr->label)
678 printf(" LABEL=\"%s\"", pr->label);
679
680 if (pr->version)
681 printf(" VERSION=\"%s\"", pr->version);
682
683 if (mp) {
684 printf(" MOUNT=\"%s\"", mp);
685 free(mp);
686 }
687
688 printf(" TYPE=\"%s\"\n", pr->type);
689
690 return 0;
691 }
692
693 static void mkdir_p(char *dir)
694 {
695 char *l = strrchr(dir, '/');
696
697 if (l) {
698 *l = '\0';
699 mkdir_p(dir);
700 *l = '/';
701 mkdir(dir, 0755);
702 }
703 }
704
705 static void check_filesystem(struct probe_info *pr)
706 {
707 pid_t pid;
708 struct stat statbuf;
709 const char *e2fsck = "/usr/sbin/e2fsck";
710 const char *f2fsck = "/usr/sbin/fsck.f2fs";
711 const char *dosfsck = "/usr/sbin/dosfsck";
712 const char *ckfs;
713
714 /* UBIFS does not need stuff like fsck */
715 if (!strncmp(pr->type, "ubifs", 5))
716 return;
717
718 if (!strncmp(pr->type, "vfat", 4)) {
719 ckfs = dosfsck;
720 } else if (!strncmp(pr->type, "f2fs", 4)) {
721 ckfs = f2fsck;
722 } else if (!strncmp(pr->type, "ext", 3)) {
723 ckfs = e2fsck;
724 } else {
725 ULOG_ERR("check_filesystem: %s is not supported\n", pr->type);
726 return;
727 }
728
729 if (stat(ckfs, &statbuf) < 0) {
730 ULOG_ERR("check_filesystem: %s not found\n", ckfs);
731 return;
732 }
733
734 pid = fork();
735 if (!pid) {
736 if(!strncmp(pr->type, "f2fs", 4)) {
737 execl(ckfs, ckfs, "-f", pr->dev, NULL);
738 exit(-1);
739 } else {
740 execl(ckfs, ckfs, "-p", pr->dev, NULL);
741 exit(-1);
742 }
743 } else if (pid > 0) {
744 int status;
745
746 waitpid(pid, &status, 0);
747 if (WEXITSTATUS(status))
748 ULOG_ERR("check_filesystem: %s returned %d\n", ckfs, WEXITSTATUS(status));
749 }
750 }
751
752 static void handle_swapfiles(bool on)
753 {
754 struct stat s;
755 struct mount *m;
756 struct probe_info *pr;
757
758 vlist_for_each_element(&mounts, m, node)
759 {
760 if (m->type != TYPE_SWAP || !m->target)
761 continue;
762
763 if (stat(m->target, &s) || !S_ISREG(s.st_mode))
764 continue;
765
766 pr = _probe_path(m->target);
767
768 if (!pr)
769 continue;
770
771 if (!strcmp(pr->type, "swap")) {
772 if (on)
773 swapon(pr->dev, m->prio);
774 else
775 swapoff(pr->dev);
776 }
777
778 free(pr);
779 }
780 }
781
782 static void to_devnull(int fd)
783 {
784 int devnull = open("/dev/null", fd ? O_WRONLY : O_RDONLY);
785
786 if (devnull >= 0)
787 dup2(devnull, fd);
788
789 if (devnull > STDERR_FILENO)
790 close(devnull);
791 }
792
793 static int exec_mount(const char *source, const char *target,
794 const char *fstype, const char *options)
795 {
796 pid_t pid;
797 struct stat s;
798 FILE *mount_fd;
799 int err, status, pfds[2];
800 char errmsg[128], cmd[sizeof("/sbin/mount.XXXXXXXXXXXXXXXX\0")];
801
802 snprintf(cmd, sizeof(cmd), "/sbin/mount.%s", fstype);
803
804 if (stat(cmd, &s) < 0 || !S_ISREG(s.st_mode) || !(s.st_mode & S_IXUSR)) {
805 ULOG_ERR("No \"mount.%s\" utility available\n", fstype);
806 return -1;
807 }
808
809 if (pipe(pfds) < 0)
810 return -1;
811
812 fcntl(pfds[0], F_SETFD, fcntl(pfds[0], F_GETFD) | FD_CLOEXEC);
813 fcntl(pfds[1], F_SETFD, fcntl(pfds[1], F_GETFD) | FD_CLOEXEC);
814
815 pid = vfork();
816
817 switch (pid) {
818 case -1:
819 close(pfds[0]);
820 close(pfds[1]);
821
822 return -1;
823
824 case 0:
825 to_devnull(STDIN_FILENO);
826 to_devnull(STDOUT_FILENO);
827
828 dup2(pfds[1], STDERR_FILENO);
829 close(pfds[0]);
830 close(pfds[1]);
831
832 if (options && *options)
833 execl(cmd, cmd, "-o", options, source, target, NULL);
834 else
835 execl(cmd, cmd, source, target, NULL);
836
837 return -1;
838
839 default:
840 close(pfds[1]);
841
842 mount_fd = fdopen(pfds[0], "r");
843
844 while (fgets(errmsg, sizeof(errmsg), mount_fd))
845 ULOG_ERR("mount.%s: %s", fstype, errmsg);
846
847 fclose(mount_fd);
848
849 err = waitpid(pid, &status, 0);
850
851 if (err != -1) {
852 if (status != 0) {
853 ULOG_ERR("mount.%s: failed with status %d\n", fstype, status);
854 errno = EINVAL;
855 err = -1;
856 } else {
857 errno = 0;
858 err = 0;
859 }
860 }
861
862 break;
863 }
864
865 return err;
866 }
867
868 static int handle_mount(const char *source, const char *target,
869 const char *fstype, struct mount *m)
870 {
871 int i, err;
872 size_t mount_opts_len;
873 char *mount_opts = NULL, *ptr;
874
875 err = mount(source, target, fstype, m ? m->flags : 0,
876 (m && m->options) ? m->options : "");
877
878 /* Requested file system type is not available in kernel,
879 attempt to call mount helper. */
880 if (err == -1 && errno == ENODEV) {
881 if (m) {
882 /* Convert mount flags back into string representation,
883 first calculate needed length of string buffer... */
884 mount_opts_len = 1 + (m->options ? strlen(m->options) : 0);
885
886 for (i = 0; i < ARRAY_SIZE(mount_flags); i++)
887 if ((mount_flags[i].flag > 0) &&
888 (mount_flags[i].flag < INT_MAX) &&
889 (m->flags & (uint32_t)mount_flags[i].flag))
890 mount_opts_len += strlen(mount_flags[i].name) + 1;
891
892 /* ... then now allocate and fill it ... */
893 ptr = mount_opts = calloc(1, mount_opts_len);
894
895 if (!ptr) {
896 errno = ENOMEM;
897 return -1;
898 }
899
900 if (m->options)
901 ptr += sprintf(ptr, "%s,", m->options);
902
903 for (i = 0; i < ARRAY_SIZE(mount_flags); i++)
904 if ((mount_flags[i].flag > 0) &&
905 (mount_flags[i].flag < INT_MAX) &&
906 (m->flags & (uint32_t)mount_flags[i].flag))
907 ptr += sprintf(ptr, "%s,", mount_flags[i].name);
908
909 mount_opts[mount_opts_len - 1] = 0;
910 }
911
912 /* ... and now finally invoke the external mount program */
913 err = exec_mount(source, target, fstype, mount_opts);
914 }
915
916 return err;
917 }
918
919 static void blockd_notify(char *device, struct mount *m, struct probe_info *pr)
920 {
921 struct ubus_context *ctx = ubus_connect(NULL);
922 uint32_t id;
923
924 if (!ctx)
925 return;
926
927 if (!ubus_lookup_id(ctx, "block", &id)) {
928 struct blob_buf buf = { 0 };
929 char *d = strrchr(device, '/');
930
931 if (d)
932 d++;
933 else
934 d = device;
935
936 blob_buf_init(&buf, 0);
937
938 if (m) {
939
940 blobmsg_add_string(&buf, "device", d);
941 if (m->uuid)
942 blobmsg_add_string(&buf, "uuid", m->uuid);
943 if (m->label)
944 blobmsg_add_string(&buf, "label", m->label);
945 if (m->target)
946 blobmsg_add_string(&buf, "target", m->target);
947 if (m->options)
948 blobmsg_add_string(&buf, "options", m->options);
949 if (m->autofs)
950 blobmsg_add_u32(&buf, "autofs", m->autofs);
951 if (pr->type)
952 blobmsg_add_string(&buf, "type", pr->type);
953 if (pr->version)
954 blobmsg_add_string(&buf, "version", pr->version);
955 } else if (pr) {
956 blobmsg_add_string(&buf, "device", d);
957 if (pr->uuid)
958 blobmsg_add_string(&buf, "uuid", pr->uuid);
959 if (pr->label)
960 blobmsg_add_string(&buf, "label", pr->label);
961 if (pr->type)
962 blobmsg_add_string(&buf, "type", pr->type);
963 if (pr->version)
964 blobmsg_add_string(&buf, "version", pr->version);
965 blobmsg_add_u32(&buf, "anon", 1);
966 } else {
967 blobmsg_add_string(&buf, "device", d);
968 blobmsg_add_u32(&buf, "remove", 1);
969 }
970
971 ubus_invoke(ctx, id, "hotplug", buf.head, NULL, NULL, 3000);
972 }
973
974 ubus_free(ctx);
975 }
976
977 static int mount_device(struct probe_info *pr, int type)
978 {
979 struct mount *m;
980 char *device;
981 char *mp;
982
983 if (!pr)
984 return -1;
985
986 device = basename(pr->dev);
987
988 if (!strcmp(pr->type, "swap")) {
989 if ((type == TYPE_HOTPLUG) && !auto_swap)
990 return -1;
991 m = find_swap(pr->uuid, pr->label, device);
992 if (m || anon_swap)
993 swapon(pr->dev, (m) ? (m->prio) : (0));
994
995 return 0;
996 }
997
998 mp = find_mount_point(pr->dev);
999 if (mp && (type != TYPE_HOTPLUG)) {
1000 ULOG_ERR("%s is already mounted on %s\n", pr->dev, mp);
1001 free(mp);
1002 return -1;
1003 }
1004
1005 m = find_block(pr->uuid, pr->label, device, NULL);
1006 if (m && m->extroot)
1007 return -1;
1008
1009 if (m) switch (type) {
1010 case TYPE_HOTPLUG:
1011 blockd_notify(device, m, pr);
1012 if (m->autofs)
1013 return 0;
1014 if (!auto_mount)
1015 return -1;
1016 break;
1017 case TYPE_AUTOFS:
1018 if (!m->autofs)
1019 return -1;
1020 break;
1021 case TYPE_DEV:
1022 if (m->autofs)
1023 return -1;
1024 break;
1025 } else if (type == TYPE_HOTPLUG) {
1026 blockd_notify(device, NULL, pr);
1027 }
1028
1029 if (m) {
1030 char *target = m->target;
1031 char _target[32];
1032 int err = 0;
1033
1034 if (m->autofs) {
1035 snprintf(_target, sizeof(_target), "/tmp/run/blockd/%s", device);
1036 target = _target;
1037 }
1038 if (!target) {
1039 snprintf(_target, sizeof(_target), "/mnt/%s", device);
1040 target = _target;
1041 }
1042 mkdir_p(target);
1043
1044 if (check_fs)
1045 check_filesystem(pr);
1046
1047 err = handle_mount(pr->dev, target, pr->type, m);
1048 if (err)
1049 ULOG_ERR("mounting %s (%s) as %s failed (%d) - %s\n",
1050 pr->dev, pr->type, target, errno, strerror(errno));
1051 else
1052 handle_swapfiles(true);
1053 return err;
1054 }
1055
1056 if (anon_mount) {
1057 char target[32];
1058 int err = 0;
1059
1060 snprintf(target, sizeof(target), "/mnt/%s", device);
1061 mkdir_p(target);
1062
1063 if (check_fs)
1064 check_filesystem(pr);
1065
1066 err = handle_mount(pr->dev, target, pr->type, NULL);
1067 if (err)
1068 ULOG_ERR("mounting %s (%s) as %s failed (%d) - %s\n",
1069 pr->dev, pr->type, target, errno, strerror(errno));
1070 else
1071 handle_swapfiles(true);
1072 return err;
1073 }
1074
1075 return 0;
1076 }
1077
1078 static int umount_device(struct probe_info *pr)
1079 {
1080 struct mount *m;
1081 char *device = basename(pr->dev);
1082 char *mp;
1083 int err;
1084
1085 if (!pr)
1086 return -1;
1087
1088 if (!strcmp(pr->type, "swap"))
1089 return -1;
1090
1091 mp = find_mount_point(pr->dev);
1092 if (!mp)
1093 return -1;
1094
1095 m = find_block(pr->uuid, pr->label, device, NULL);
1096 if (m && m->extroot)
1097 return -1;
1098
1099 err = umount2(mp, MNT_DETACH);
1100 if (err)
1101 ULOG_ERR("unmounting %s (%s) failed (%d) - %s\n",
1102 pr->dev, mp, errno, strerror(errno));
1103 else
1104 ULOG_INFO("unmounted %s (%s)\n",
1105 pr->dev, mp);
1106
1107 free(mp);
1108 return err;
1109 }
1110
1111 static int mount_action(char *action, char *device, int type)
1112 {
1113 char path[32];
1114 char *mount_point;
1115
1116 if (!action || !device)
1117 return -1;
1118 snprintf(path, sizeof(path), "/dev/%s", device);
1119
1120 if (!strcmp(action, "remove")) {
1121 int err = 0;
1122
1123 if (type == TYPE_HOTPLUG)
1124 blockd_notify(device, NULL, NULL);
1125
1126 mount_point = find_mount_point(path);
1127 if (mount_point)
1128 err = umount2(mount_point, MNT_DETACH);
1129
1130 if (err)
1131 ULOG_ERR("umount of %s failed (%d) - %s\n",
1132 mount_point, errno, strerror(errno));
1133
1134 free(mount_point);
1135 return 0;
1136 } else if (strcmp(action, "add")) {
1137 ULOG_ERR("Unkown action %s\n", action);
1138
1139 return -1;
1140 }
1141
1142 if (config_load(NULL))
1143 return -1;
1144 cache_load(0);
1145
1146 return mount_device(find_block_info(NULL, NULL, path), type);
1147 }
1148
1149 static int main_hotplug(int argc, char **argv)
1150 {
1151 return mount_action(getenv("ACTION"), getenv("DEVNAME"), TYPE_HOTPLUG);
1152 }
1153
1154 static int main_autofs(int argc, char **argv)
1155 {
1156 if (argc < 3)
1157 return -1;
1158
1159 if (!strcmp(argv[2], "start")) {
1160 struct probe_info *pr;
1161
1162 if (config_load(NULL))
1163 return -1;
1164
1165 cache_load(0);
1166 list_for_each_entry(pr, &devices, list) {
1167 struct mount *m = find_block(pr->uuid, pr->label, NULL, NULL);
1168
1169 if (m && m->autofs)
1170 mount_device(pr, TYPE_HOTPLUG);
1171 else
1172 blockd_notify(pr->dev, m, pr);
1173 }
1174 return 0;
1175 }
1176 return mount_action(argv[2], argv[3], TYPE_AUTOFS);
1177 }
1178
1179 static int find_block_mtd(char *name, char *part, int plen)
1180 {
1181 FILE *fp = fopen("/proc/mtd", "r");
1182 static char line[256];
1183 char *index = NULL;
1184
1185 if(!fp)
1186 return -1;
1187
1188 while (!index && fgets(line, sizeof(line), fp)) {
1189 if (strstr(line, name)) {
1190 char *eol = strstr(line, ":");
1191
1192 if (!eol)
1193 continue;
1194
1195 *eol = '\0';
1196 index = &line[3];
1197 }
1198 }
1199
1200 fclose(fp);
1201
1202 if (!index)
1203 return -1;
1204
1205 snprintf(part, plen, "/dev/mtdblock%s", index);
1206
1207 return 0;
1208 }
1209
1210 #ifdef UBIFS_EXTROOT
1211 static int find_ubi_vol(libubi_t libubi, char *name, int *dev_num, int *vol_id)
1212 {
1213 int dev = 0;
1214
1215 while (ubi_dev_present(libubi, dev))
1216 {
1217 struct ubi_dev_info dev_info;
1218 struct ubi_vol_info vol_info;
1219
1220 if (ubi_get_dev_info1(libubi, dev++, &dev_info))
1221 continue;
1222 if (ubi_get_vol_info1_nm(libubi, dev_info.dev_num, name, &vol_info))
1223 continue;
1224
1225 *dev_num = dev_info.dev_num;
1226 *vol_id = vol_info.vol_id;
1227
1228 return 0;
1229 }
1230
1231 return -1;
1232 }
1233
1234 static int find_block_ubi(libubi_t libubi, char *name, char *part, int plen)
1235 {
1236 int dev_num;
1237 int vol_id;
1238 int err = -1;
1239
1240 err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
1241 if (!err)
1242 snprintf(part, plen, "/dev/ubi%d_%d", dev_num, vol_id);
1243
1244 return err;
1245 }
1246
1247 static int find_block_ubi_RO(libubi_t libubi, char *name, char *part, int plen)
1248 {
1249 int dev_num;
1250 int vol_id;
1251 int err = -1;
1252
1253 err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
1254 if (!err)
1255 snprintf(part, plen, "/dev/ubiblock%d_%d", dev_num, vol_id);
1256
1257 return err;
1258 }
1259
1260 #else
1261
1262 static int find_root_dev(char *buf, int len)
1263 {
1264 DIR *d;
1265 dev_t root;
1266 struct stat s;
1267 struct dirent *e;
1268
1269 if (stat("/", &s))
1270 return -1;
1271
1272 if (!(d = opendir("/dev")))
1273 return -1;
1274
1275 root = s.st_dev;
1276
1277 while ((e = readdir(d)) != NULL) {
1278 snprintf(buf, len, "/dev/%s", e->d_name);
1279
1280 if (stat(buf, &s) || s.st_rdev != root)
1281 continue;
1282
1283 closedir(d);
1284 return 0;
1285 }
1286
1287 closedir(d);
1288 return -1;
1289 }
1290
1291 #endif
1292
1293 static int test_fs_support(const char *name)
1294 {
1295 char line[128], *p;
1296 int rv = -1;
1297 FILE *f;
1298
1299 if ((f = fopen("/proc/filesystems", "r")) != NULL) {
1300 while (fgets(line, sizeof(line), f)) {
1301 p = strtok(line, "\t\n");
1302
1303 if (p && !strcmp(p, "nodev"))
1304 p = strtok(NULL, "\t\n");
1305
1306 if (p && !strcmp(p, name)) {
1307 rv = 0;
1308 break;
1309 }
1310 }
1311 fclose(f);
1312 }
1313
1314 return rv;
1315 }
1316
1317 static int check_extroot(char *path)
1318 {
1319 struct probe_info *pr = NULL;
1320 char devpath[32];
1321
1322 #ifdef UBIFS_EXTROOT
1323 if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) {
1324 int err = -1;
1325 libubi_t libubi;
1326
1327 libubi = libubi_open();
1328 err = find_block_ubi_RO(libubi, "rootfs", devpath, sizeof(devpath));
1329 libubi_close(libubi);
1330 if (err)
1331 return -1;
1332 }
1333 #else
1334 if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) {
1335 if (find_root_dev(devpath, sizeof(devpath))) {
1336 ULOG_ERR("extroot: unable to determine root device\n");
1337 return -1;
1338 }
1339 }
1340 #endif
1341
1342 list_for_each_entry(pr, &devices, list) {
1343 if (!strcmp(pr->dev, devpath)) {
1344 struct stat s;
1345 FILE *fp = NULL;
1346 char tag[64];
1347 char uuid[64] = { 0 };
1348
1349 snprintf(tag, sizeof(tag), "%s/etc", path);
1350 if (stat(tag, &s))
1351 mkdir_p(tag);
1352
1353 snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
1354 if (stat(tag, &s)) {
1355 fp = fopen(tag, "w+");
1356 if (!fp) {
1357 ULOG_ERR("extroot: failed to write UUID to %s: %d (%s)\n",
1358 tag, errno, strerror(errno));
1359 /* return 0 to continue boot regardless of error */
1360 return 0;
1361 }
1362 fputs(pr->uuid, fp);
1363 fclose(fp);
1364 return 0;
1365 }
1366
1367 fp = fopen(tag, "r");
1368 if (!fp) {
1369 ULOG_ERR("extroot: failed to read UUID from %s: %d (%s)\n",
1370 tag, errno, strerror(errno));
1371 return -1;
1372 }
1373
1374 if (!fgets(uuid, sizeof(uuid), fp))
1375 ULOG_ERR("extroot: failed to read UUID from %s: %d (%s)\n",
1376 tag, errno, strerror(errno));
1377 fclose(fp);
1378
1379 if (*uuid && !strcasecmp(uuid, pr->uuid))
1380 return 0;
1381
1382 ULOG_ERR("extroot: UUID mismatch (root: %s, %s: %s)\n",
1383 pr->uuid, basename(path), uuid);
1384 return -1;
1385 }
1386 }
1387
1388 ULOG_ERR("extroot: unable to lookup root device %s\n", devpath);
1389 return -1;
1390 }
1391
1392 /*
1393 * Read info about extroot from UCI (using prefix) and mount it.
1394 */
1395 static int mount_extroot(char *cfg)
1396 {
1397 char overlay[] = "/tmp/extroot/overlay";
1398 char mnt[] = "/tmp/extroot/mnt";
1399 char *path = mnt;
1400 struct probe_info *pr;
1401 struct mount *m;
1402 int err = -1;
1403
1404 /* Load @cfg/etc/config/fstab */
1405 if (config_load(cfg))
1406 return -2;
1407
1408 /* See if there is extroot-specific mount config */
1409 m = find_block(NULL, NULL, NULL, "/");
1410 if (!m)
1411 m = find_block(NULL, NULL, NULL, "/overlay");
1412
1413 if (!m || !m->extroot)
1414 {
1415 ULOG_INFO("extroot: not configured\n");
1416 return -1;
1417 }
1418
1419 /* Find block device pointed by the mount config */
1420 pr = find_block_info(m->uuid, m->label, m->device);
1421
1422 if (!pr && delay_root){
1423 ULOG_INFO("extroot: device not present, retrying in %u seconds\n", delay_root);
1424 sleep(delay_root);
1425 make_devs();
1426 cache_load(0);
1427 pr = find_block_info(m->uuid, m->label, m->device);
1428 }
1429 if (pr) {
1430 if (strncmp(pr->type, "ext", 3) &&
1431 strncmp(pr->type, "f2fs", 4) &&
1432 strncmp(pr->type, "ubifs", 5)) {
1433 ULOG_ERR("extroot: unsupported filesystem %s, try ext4, f2fs or ubifs\n", pr->type);
1434 return -1;
1435 }
1436
1437 if (test_fs_support(pr->type)) {
1438 ULOG_ERR("extroot: filesystem %s not supported by kernel\n", pr->type);
1439 return -1;
1440 }
1441
1442 if (m->overlay)
1443 path = overlay;
1444 mkdir_p(path);
1445
1446 if (check_fs)
1447 check_filesystem(pr);
1448
1449 err = mount(pr->dev, path, pr->type, m->flags,
1450 (m->options) ? (m->options) : (""));
1451
1452 if (err) {
1453 ULOG_ERR("extroot: mounting %s (%s) on %s failed: %d (%s)\n",
1454 pr->dev, pr->type, path, errno, strerror(errno));
1455 } else if (m->overlay) {
1456 err = check_extroot(path);
1457 if (err)
1458 umount(path);
1459 }
1460 } else {
1461 ULOG_ERR("extroot: cannot find device %s%s\n",
1462 (m->uuid ? "with UUID " : (m->label ? "with label " : "")),
1463 (m->uuid ? m->uuid : (m->label ? m->label : m->device)));
1464 }
1465
1466 return err;
1467 }
1468
1469 static int main_extroot(int argc, char **argv)
1470 {
1471 struct probe_info *pr;
1472 char blkdev_path[32] = { 0 };
1473 int err = -1;
1474 #ifdef UBIFS_EXTROOT
1475 libubi_t libubi;
1476 #endif
1477
1478 if (!getenv("PREINIT"))
1479 return -1;
1480
1481 if (argc != 2) {
1482 ULOG_ERR("Usage: block extroot\n");
1483 return -1;
1484 }
1485
1486 make_devs();
1487 cache_load(1);
1488
1489 /* enable LOG_INFO messages */
1490 ulog_threshold(LOG_INFO);
1491
1492 /*
1493 * Look for "rootfs_data". We will want to mount it and check for
1494 * extroot configuration.
1495 */
1496
1497 /* Start with looking for MTD partition */
1498 find_block_mtd("\"rootfs_data\"", blkdev_path, sizeof(blkdev_path));
1499 if (blkdev_path[0]) {
1500 pr = find_block_info(NULL, NULL, blkdev_path);
1501 if (pr && !strcmp(pr->type, "jffs2")) {
1502 char cfg[] = "/tmp/jffs_cfg";
1503
1504 /*
1505 * Mount MTD part and try extroot (using
1506 * /etc/config/fstab from that partition)
1507 */
1508 mkdir_p(cfg);
1509 if (!mount(blkdev_path, cfg, "jffs2", MS_NOATIME, NULL)) {
1510 err = mount_extroot(cfg);
1511 umount2(cfg, MNT_DETACH);
1512 }
1513 if (err < 0)
1514 rmdir("/tmp/overlay");
1515 rmdir(cfg);
1516 return err;
1517 }
1518 }
1519
1520 #ifdef UBIFS_EXTROOT
1521 /* ... but it also could be an UBI volume */
1522 memset(blkdev_path, 0, sizeof(blkdev_path));
1523 libubi = libubi_open();
1524 find_block_ubi(libubi, "rootfs_data", blkdev_path, sizeof(blkdev_path));
1525 libubi_close(libubi);
1526 if (blkdev_path[0]) {
1527 char cfg[] = "/tmp/ubifs_cfg";
1528
1529 /* Mount volume and try extroot (using fstab from that vol) */
1530 mkdir_p(cfg);
1531 if (!mount(blkdev_path, cfg, "ubifs", MS_NOATIME, NULL)) {
1532 err = mount_extroot(cfg);
1533 umount2(cfg, MNT_DETACH);
1534 }
1535 if (err < 0)
1536 rmdir("/tmp/overlay");
1537 rmdir(cfg);
1538 return err;
1539 }
1540 #endif
1541
1542 return mount_extroot(NULL);
1543 }
1544
1545 static int main_mount(int argc, char **argv)
1546 {
1547 struct probe_info *pr;
1548
1549 if (config_load(NULL))
1550 return -1;
1551
1552 cache_load(1);
1553 list_for_each_entry(pr, &devices, list)
1554 mount_device(pr, TYPE_DEV);
1555
1556 handle_swapfiles(true);
1557
1558 return 0;
1559 }
1560
1561 static int main_umount(int argc, char **argv)
1562 {
1563 struct probe_info *pr;
1564
1565 if (config_load(NULL))
1566 return -1;
1567
1568 handle_swapfiles(false);
1569
1570 cache_load(0);
1571 list_for_each_entry(pr, &devices, list)
1572 umount_device(pr);
1573
1574 return 0;
1575 }
1576
1577 static int main_detect(int argc, char **argv)
1578 {
1579 struct probe_info *pr;
1580
1581 cache_load(0);
1582 printf("config 'global'\n");
1583 printf("\toption\tanon_swap\t'0'\n");
1584 printf("\toption\tanon_mount\t'0'\n");
1585 printf("\toption\tauto_swap\t'1'\n");
1586 printf("\toption\tauto_mount\t'1'\n");
1587 printf("\toption\tdelay_root\t'5'\n");
1588 printf("\toption\tcheck_fs\t'0'\n\n");
1589 list_for_each_entry(pr, &devices, list)
1590 print_block_uci(pr);
1591
1592 return 0;
1593 }
1594
1595 static int main_info(int argc, char **argv)
1596 {
1597 int i;
1598 struct probe_info *pr;
1599
1600 cache_load(1);
1601 if (argc == 2) {
1602 list_for_each_entry(pr, &devices, list)
1603 print_block_info(pr);
1604
1605 return 0;
1606 };
1607
1608 for (i = 2; i < argc; i++) {
1609 struct stat s;
1610
1611 if (stat(argv[i], &s)) {
1612 ULOG_ERR("failed to stat %s\n", argv[i]);
1613 continue;
1614 }
1615 if (!S_ISBLK(s.st_mode) && !(S_ISCHR(s.st_mode) && major(s.st_rdev) == 250)) {
1616 ULOG_ERR("%s is not a block device\n", argv[i]);
1617 continue;
1618 }
1619 pr = find_block_info(NULL, NULL, argv[i]);
1620 if (pr)
1621 print_block_info(pr);
1622 }
1623
1624 return 0;
1625 }
1626
1627 static int swapon_usage(void)
1628 {
1629 fprintf(stderr, "Usage: swapon [-s] [-a] [[-p pri] DEVICE]\n\n"
1630 "\tStart swapping on [DEVICE]\n"
1631 " -a\tStart swapping on all swap devices\n"
1632 " -p pri\tSet priority of swap device\n"
1633 " -s\tShow summary\n");
1634 return -1;
1635 }
1636
1637 static int main_swapon(int argc, char **argv)
1638 {
1639 int ch;
1640 FILE *fp;
1641 char *lineptr;
1642 size_t s;
1643 struct probe_info *pr;
1644 int flags = 0;
1645 int pri;
1646 struct stat st;
1647 int err;
1648
1649 while ((ch = getopt(argc, argv, "ap:s")) != -1) {
1650 switch(ch) {
1651 case 's':
1652 fp = fopen("/proc/swaps", "r");
1653 lineptr = NULL;
1654
1655 if (!fp) {
1656 ULOG_ERR("failed to open /proc/swaps\n");
1657 return -1;
1658 }
1659 while (getline(&lineptr, &s, fp) > 0)
1660 printf("%s", lineptr);
1661 if (lineptr)
1662 free(lineptr);
1663 fclose(fp);
1664 return 0;
1665 case 'a':
1666 cache_load(0);
1667 list_for_each_entry(pr, &devices, list) {
1668 if (strcmp(pr->type, "swap"))
1669 continue;
1670 if (swapon(pr->dev, 0))
1671 ULOG_ERR("failed to swapon %s\n", pr->dev);
1672 }
1673 return 0;
1674 case 'p':
1675 pri = atoi(optarg);
1676 if (pri >= 0)
1677 flags = ((pri << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
1678 break;
1679 default:
1680 return swapon_usage();
1681 }
1682
1683 }
1684
1685 if (optind != (argc - 1))
1686 return swapon_usage();
1687
1688 if (stat(argv[optind], &st) || (!S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))) {
1689 ULOG_ERR("%s is not a block device or file\n", argv[optind]);
1690 return -1;
1691 }
1692 err = swapon(argv[optind], flags);
1693 if (err) {
1694 ULOG_ERR("failed to swapon %s (%d)\n", argv[optind], err);
1695 return err;
1696 }
1697
1698 return 0;
1699 }
1700
1701 static int main_swapoff(int argc, char **argv)
1702 {
1703 if (argc != 2) {
1704 ULOG_ERR("Usage: swapoff [-a] [DEVICE]\n\n"
1705 "\tStop swapping on DEVICE\n"
1706 " -a\tStop swapping on all swap devices\n");
1707 return -1;
1708 }
1709
1710 if (!strcmp(argv[1], "-a")) {
1711 FILE *fp = fopen("/proc/swaps", "r");
1712 char line[256];
1713
1714 if (!fp) {
1715 ULOG_ERR("failed to open /proc/swaps\n");
1716 return -1;
1717 }
1718 if (fgets(line, sizeof(line), fp))
1719 while (fgets(line, sizeof(line), fp)) {
1720 char *end = strchr(line, ' ');
1721 int err;
1722
1723 if (!end)
1724 continue;
1725 *end = '\0';
1726 err = swapoff(line);
1727 if (err)
1728 ULOG_ERR("failed to swapoff %s (%d)\n", line, err);
1729 }
1730 fclose(fp);
1731 } else {
1732 struct stat s;
1733 int err;
1734
1735 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1736 ULOG_ERR("%s is not a block device or file\n", argv[1]);
1737 return -1;
1738 }
1739 err = swapoff(argv[1]);
1740 if (err) {
1741 ULOG_ERR("failed to swapoff %s (%d)\n", argv[1], err);
1742 return err;
1743 }
1744 }
1745
1746 return 0;
1747 }
1748
1749 int main(int argc, char **argv)
1750 {
1751 char *base = basename(*argv);
1752
1753 umask(0);
1754
1755 ulog_open(-1, -1, "block");
1756 ulog_threshold(LOG_NOTICE);
1757
1758 if (!strcmp(base, "swapon"))
1759 return main_swapon(argc, argv);
1760
1761 if (!strcmp(base, "swapoff"))
1762 return main_swapoff(argc, argv);
1763
1764 if ((argc > 1) && !strcmp(base, "block")) {
1765 if (!strcmp(argv[1], "info"))
1766 return main_info(argc, argv);
1767
1768 if (!strcmp(argv[1], "detect"))
1769 return main_detect(argc, argv);
1770
1771 if (!strcmp(argv[1], "hotplug"))
1772 return main_hotplug(argc, argv);
1773
1774 if (!strcmp(argv[1], "autofs"))
1775 return main_autofs(argc, argv);
1776
1777 if (!strcmp(argv[1], "extroot"))
1778 return main_extroot(argc, argv);
1779
1780 if (!strcmp(argv[1], "mount"))
1781 return main_mount(argc, argv);
1782
1783 if (!strcmp(argv[1], "umount"))
1784 return main_umount(argc, argv);
1785
1786 if (!strcmp(argv[1], "remount")) {
1787 int ret = main_umount(argc, argv);
1788
1789 if (!ret)
1790 ret = main_mount(argc, argv);
1791 return ret;
1792 }
1793 }
1794
1795 ULOG_ERR("Usage: block <info|mount|umount|detect>\n");
1796
1797 return -1;
1798 }
OpenWrt filesystem utilities