kmodloader: support loading modules from a different prefix
[project/ubox.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 <stdio.h>
17 #include <unistd.h>
18 #include <syslog.h>
19 #include <libgen.h>
20 #include <glob.h>
21
22 #include <sys/stat.h>
23 #include <sys/types.h>
24 #include <sys/swap.h>
25 #include <sys/mount.h>
26 #include <sys/wait.h>
27
28 #include <uci.h>
29 #include <uci_blob.h>
30
31 #include <libubox/list.h>
32 #include <libubox/vlist.h>
33 #include <libubox/blobmsg_json.h>
34 #include <libubox/avl-cmp.h>
35
36 #include "libblkid-tiny/libblkid-tiny.h"
37
38 enum {
39 TYPE_MOUNT,
40 TYPE_SWAP,
41 };
42
43 struct mount {
44 struct vlist_node node;
45 int type;
46
47 char *target;
48 char *path;
49 char *options;
50 char *uuid;
51 char *label;
52 char *device;
53 int extroot;
54 int overlay;
55 int disabled_fsck;
56 unsigned int prio;
57 };
58
59 static struct vlist_tree mounts;
60 static struct blob_buf b;
61 static LIST_HEAD(devices);
62 static int anon_mount, anon_swap, auto_mount, auto_swap, check_fs;
63 static unsigned int delay_root;
64
65 enum {
66 CFG_ANON_MOUNT,
67 CFG_ANON_SWAP,
68 CFG_AUTO_MOUNT,
69 CFG_AUTO_SWAP,
70 CFG_DELAY_ROOT,
71 CFG_CHECK_FS,
72 __CFG_MAX
73 };
74
75 static const struct blobmsg_policy config_policy[__CFG_MAX] = {
76 [CFG_ANON_SWAP] = { .name = "anon_swap", .type = BLOBMSG_TYPE_INT32 },
77 [CFG_ANON_MOUNT] = { .name = "anon_mount", .type = BLOBMSG_TYPE_INT32 },
78 [CFG_AUTO_SWAP] = { .name = "auto_swap", .type = BLOBMSG_TYPE_INT32 },
79 [CFG_AUTO_MOUNT] = { .name = "auto_mount", .type = BLOBMSG_TYPE_INT32 },
80 [CFG_DELAY_ROOT] = { .name = "delay_root", .type = BLOBMSG_TYPE_INT32 },
81 [CFG_CHECK_FS] = { .name = "check_fs", .type = BLOBMSG_TYPE_INT32 },
82 };
83
84 enum {
85 MOUNT_UUID,
86 MOUNT_LABEL,
87 MOUNT_ENABLE,
88 MOUNT_TARGET,
89 MOUNT_DEVICE,
90 MOUNT_OPTIONS,
91 __MOUNT_MAX
92 };
93
94 static const struct uci_blob_param_list config_attr_list = {
95 .n_params = __CFG_MAX,
96 .params = config_policy,
97 };
98
99 static const struct blobmsg_policy mount_policy[__MOUNT_MAX] = {
100 [MOUNT_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
101 [MOUNT_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
102 [MOUNT_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
103 [MOUNT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
104 [MOUNT_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_STRING },
105 [MOUNT_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
106 };
107
108 static const struct uci_blob_param_list mount_attr_list = {
109 .n_params = __MOUNT_MAX,
110 .params = mount_policy,
111 };
112
113 enum {
114 SWAP_ENABLE,
115 SWAP_UUID,
116 SWAP_DEVICE,
117 SWAP_PRIO,
118 __SWAP_MAX
119 };
120
121 static const struct blobmsg_policy swap_policy[__SWAP_MAX] = {
122 [SWAP_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
123 [SWAP_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
124 [SWAP_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
125 [SWAP_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 },
126 };
127
128 static const struct uci_blob_param_list swap_attr_list = {
129 .n_params = __SWAP_MAX,
130 .params = swap_policy,
131 };
132
133 static char *blobmsg_get_strdup(struct blob_attr *attr)
134 {
135 if (!attr)
136 return NULL;
137
138 return strdup(blobmsg_get_string(attr));
139 }
140
141 static char *blobmsg_get_basename(struct blob_attr *attr)
142 {
143 if (!attr)
144 return NULL;
145
146 return strdup(basename(blobmsg_get_string(attr)));
147 }
148
149 static int mount_add(struct uci_section *s)
150 {
151 struct blob_attr *tb[__MOUNT_MAX] = { 0 };
152 struct mount *m;
153
154 blob_buf_init(&b, 0);
155 uci_to_blob(&b, s, &mount_attr_list);
156 blobmsg_parse(mount_policy, __MOUNT_MAX, tb, blob_data(b.head), blob_len(b.head));
157
158 if (!tb[MOUNT_LABEL] && !tb[MOUNT_UUID] && !tb[MOUNT_DEVICE])
159 return -1;
160
161 if (tb[MOUNT_ENABLE] && !blobmsg_get_u32(tb[MOUNT_ENABLE]))
162 return -1;
163
164 m = malloc(sizeof(struct mount));
165 m->type = TYPE_MOUNT;
166 m->uuid = blobmsg_get_strdup(tb[MOUNT_UUID]);
167 m->label = blobmsg_get_strdup(tb[MOUNT_LABEL]);
168 m->target = blobmsg_get_strdup(tb[MOUNT_TARGET]);
169 m->options = blobmsg_get_strdup(tb[MOUNT_OPTIONS]);
170 m->device = blobmsg_get_basename(tb[MOUNT_DEVICE]);
171 m->overlay = m->extroot = 0;
172 if (m->target && !strcmp(m->target, "/"))
173 m->extroot = 1;
174 if (m->target && !strcmp(m->target, "/overlay"))
175 m->extroot = m->overlay = 1;
176
177 if (m->uuid)
178 vlist_add(&mounts, &m->node, m->uuid);
179 else if (m->label)
180 vlist_add(&mounts, &m->node, m->label);
181 else if (m->device)
182 vlist_add(&mounts, &m->node, m->device);
183
184 return 0;
185 }
186
187 static int swap_add(struct uci_section *s)
188 {
189 struct blob_attr *tb[__SWAP_MAX] = { 0 };
190 struct mount *m;
191
192 blob_buf_init(&b, 0);
193 uci_to_blob(&b, s, &swap_attr_list);
194 blobmsg_parse(swap_policy, __SWAP_MAX, tb, blob_data(b.head), blob_len(b.head));
195
196 if (!tb[SWAP_UUID] && !tb[SWAP_DEVICE])
197 return -1;
198
199 m = malloc(sizeof(struct mount));
200 memset(m, 0, sizeof(struct mount));
201 m->type = TYPE_SWAP;
202 m->uuid = blobmsg_get_strdup(tb[SWAP_UUID]);
203 m->device = blobmsg_get_basename(tb[SWAP_DEVICE]);
204 if (tb[SWAP_PRIO])
205 m->prio = blobmsg_get_u32(tb[SWAP_PRIO]);
206 if (m->prio)
207 m->prio = ((m->prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
208
209 if ((!tb[SWAP_ENABLE]) || blobmsg_get_u32(tb[SWAP_ENABLE]))
210 vlist_add(&mounts, &m->node, (m->uuid) ? (m->uuid) : (m->device));
211
212 return 0;
213 }
214
215 static int global_add(struct uci_section *s)
216 {
217 struct blob_attr *tb[__CFG_MAX] = { 0 };
218
219 blob_buf_init(&b, 0);
220 uci_to_blob(&b, s, &config_attr_list);
221 blobmsg_parse(config_policy, __CFG_MAX, tb, blob_data(b.head), blob_len(b.head));
222
223 if ((tb[CFG_ANON_MOUNT]) && blobmsg_get_u32(tb[CFG_ANON_MOUNT]))
224 anon_mount = 1;
225 if ((tb[CFG_ANON_SWAP]) && blobmsg_get_u32(tb[CFG_ANON_SWAP]))
226 anon_swap = 1;
227
228 if ((tb[CFG_AUTO_MOUNT]) && blobmsg_get_u32(tb[CFG_AUTO_MOUNT]))
229 auto_mount = 1;
230 if ((tb[CFG_AUTO_SWAP]) && blobmsg_get_u32(tb[CFG_AUTO_SWAP]))
231 auto_swap = 1;
232
233 if (tb[CFG_DELAY_ROOT])
234 delay_root = blobmsg_get_u32(tb[CFG_DELAY_ROOT]);
235
236 if ((tb[CFG_CHECK_FS]) && blobmsg_get_u32(tb[CFG_CHECK_FS]))
237 check_fs = 1;
238
239 return 0;
240 }
241
242 static struct mount* find_swap(const char *uuid, const char *device)
243 {
244 struct mount *m;
245
246 vlist_for_each_element(&mounts, m, node) {
247 if (m->type != TYPE_SWAP)
248 continue;
249 if (uuid && m->uuid && !strcmp(m->uuid, uuid))
250 return m;
251 if (device && m->device && !strcmp(m->device, device))
252 return m;
253 }
254
255 return NULL;
256 }
257
258 static struct mount* find_block(const char *uuid, const char *label, const char *device,
259 const char *target)
260 {
261 struct mount *m;
262
263 vlist_for_each_element(&mounts, m, node) {
264 if (m->type != TYPE_MOUNT)
265 continue;
266 if (m->uuid && uuid && !strcmp(m->uuid, uuid))
267 return m;
268 if (m->label && label && !strcmp(m->label, label))
269 return m;
270 if (m->target && target && !strcmp(m->target, target))
271 return m;
272 if (m->device && device && !strcmp(m->device, device))
273 return m;
274 }
275
276 return NULL;
277 }
278
279 static void mounts_update(struct vlist_tree *tree, struct vlist_node *node_new,
280 struct vlist_node *node_old)
281 {
282 }
283
284 static int config_load(char *cfg)
285 {
286 struct uci_context *ctx;
287 struct uci_package *pkg;
288 struct uci_element *e;
289
290 vlist_init(&mounts, avl_strcmp, mounts_update);
291
292 ctx = uci_alloc_context();
293 if (cfg) {
294 char path[32];
295 snprintf(path, 32, "%s/etc/config", cfg);
296 uci_set_confdir(ctx, path);
297 }
298
299 if (uci_load(ctx, "fstab", &pkg))
300 return -1;
301
302 vlist_update(&mounts);
303 uci_foreach_element(&pkg->sections, e) {
304 struct uci_section *s = uci_to_section(e);
305
306 if (!strcmp(s->type, "mount"))
307 mount_add(s);
308 if (!strcmp(s->type, "swap"))
309 swap_add(s);
310 if (!strcmp(s->type, "global"))
311 global_add(s);
312 }
313 vlist_flush(&mounts);
314
315 return 0;
316 }
317
318 static int _cache_load(const char *path)
319 {
320 int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
321 int j;
322 glob_t gl;
323
324 if (glob(path, gl_flags, NULL, &gl) < 0)
325 return -1;
326
327 for (j = 0; j < gl.gl_pathc; j++) {
328 struct blkid_struct_probe *pr = malloc(sizeof(struct blkid_struct_probe));
329 memset(pr, 0, sizeof(struct blkid_struct_probe));
330 probe_block(gl.gl_pathv[j], pr);
331 if (pr->err || !pr->id)
332 free(pr);
333 else
334 list_add_tail(&pr->list, &devices);
335 }
336
337 globfree(&gl);
338
339 return 0;
340 }
341
342 static void cache_load(int mtd)
343 {
344 if (mtd)
345 _cache_load("/dev/mtdblock*");
346 _cache_load("/dev/mmcblk*");
347 _cache_load("/dev/sd*");
348 _cache_load("/dev/sdc*");
349 _cache_load("/dev/hd*");
350 _cache_load("/dev/md*");
351 _cache_load("/dev/mapper/*");
352 }
353
354 static int print_block_info(struct blkid_struct_probe *pr)
355 {
356 printf("%s:", pr->dev);
357 if (pr->uuid[0])
358 printf(" UUID=\"%s\"", pr->uuid);
359
360 if (pr->label[0])
361 printf(" LABEL=\"%s\"", pr->label);
362
363 if (pr->name[0])
364 printf(" NAME=\"%s\"", pr->name);
365
366 if (pr->version[0])
367 printf(" VERSION=\"%s\"", pr->version);
368
369 printf(" TYPE=\"%s\"\n", pr->id->name);
370
371 return 0;
372 }
373
374 static int print_block_uci(struct blkid_struct_probe *pr)
375 {
376 if (!strcmp(pr->id->name, "swap")) {
377 printf("config 'swap'\n");
378 } else {
379 printf("config 'mount'\n");
380 printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev));
381 }
382 if (pr->uuid[0])
383 printf("\toption\tuuid\t'%s'\n", pr->uuid);
384 else
385 printf("\toption\tdevice\t'%s'\n", pr->dev);
386 printf("\toption\tenabled\t'0'\n\n");
387
388 return 0;
389 }
390
391 static struct blkid_struct_probe* find_block_info(char *uuid, char *label, char *path)
392 {
393 struct blkid_struct_probe *pr = NULL;
394
395 if (uuid)
396 list_for_each_entry(pr, &devices, list)
397 if (!strcmp(pr->uuid, uuid))
398 return pr;
399
400 if (label)
401 list_for_each_entry(pr, &devices, list)
402 if (strcmp(pr->label, label))
403 return pr;
404
405 if (path)
406 list_for_each_entry(pr, &devices, list)
407 if (!strcmp(pr->dev, path))
408 return pr;
409
410 return NULL;
411 }
412
413 static char* find_mount_point(char *block)
414 {
415 FILE *fp = fopen("/proc/mounts", "r");
416 static char line[256];
417 int len = strlen(block);
418 char *point = NULL;
419
420 if(!fp)
421 return NULL;
422
423 while (fgets(line, sizeof(line), fp)) {
424 if (!strncmp(line, block, len)) {
425 char *p = &line[len + 1];
426 char *t = strstr(p, " ");
427
428 if (!t)
429 return NULL;
430 *t = '\0';
431 point = p;
432 break;
433 }
434 }
435
436 fclose(fp);
437
438 return point;
439 }
440
441 static void mkdir_p(char *dir)
442 {
443 char *l = strrchr(dir, '/');
444
445 if (l) {
446 *l = '\0';
447 mkdir_p(dir);
448 *l = '/';
449 mkdir(dir, 0755);
450 }
451 }
452
453 static void check_filesystem(struct blkid_struct_probe *pr)
454 {
455 pid_t pid;
456 struct stat statbuf;
457 char *e2fsck = "/usr/sbin/e2fsck";
458
459 if (strncmp(pr->id->name, "ext", 3)) {
460 fprintf(stderr, "check_filesystem: %s is not supported\n", pr->id->name);
461 return;
462 }
463
464 if (stat(e2fsck, &statbuf) < 0) {
465 fprintf(stderr, "check_filesystem: %s not found\n", e2fsck);
466 return;
467 }
468
469 pid = fork();
470 if (!pid) {
471 execl(e2fsck, e2fsck, "-p", pr->dev, NULL);
472 exit(-1);
473 } else if (pid > 0) {
474 int status;
475
476 waitpid(pid, &status, 0);
477 if (WEXITSTATUS(status))
478 fprintf(stderr, "check_filesystem: %s returned %d\n", e2fsck, WEXITSTATUS(status));
479 }
480 }
481
482 static int mount_device(struct blkid_struct_probe *pr, int hotplug)
483 {
484 struct mount *m;
485 char *device;
486
487 if (!pr)
488 return -1;
489
490 device = basename(pr->dev);
491
492 if (!strcmp(pr->id->name, "swap")) {
493 if (hotplug && !auto_swap)
494 return -1;
495 m = find_swap(pr->uuid, device);
496 if (m || anon_swap)
497 swapon(pr->dev, (m) ? (m->prio) : (0));
498
499 return 0;
500 }
501
502 if (hotplug && !auto_mount)
503 return -1;
504
505 if (find_mount_point(pr->dev)) {
506 fprintf(stderr, "%s is already mounted\n", pr->dev);
507 return -1;
508 }
509
510 m = find_block(pr->uuid, pr->label, device, NULL);
511 if (m && m->extroot)
512 return -1;
513
514 if (m) {
515 char *target = m->target;
516 char _target[32];
517 int err = 0;
518
519 if (!target) {
520 snprintf(_target, sizeof(_target), "/mnt/%s", device);
521 target = _target;
522 }
523 mkdir_p(target);
524
525 if (check_fs)
526 check_filesystem(pr);
527
528 err = mount(pr->dev, target, pr->id->name, 0, (m->options) ? (m->options) : (""));
529 if (err)
530 fprintf(stderr, "mounting %s (%s) as %s failed (%d) - %s\n",
531 pr->dev, pr->id->name, target, err, strerror(err));
532 return err;
533 }
534
535 if (anon_mount) {
536 char target[] = "/mnt/mmcblk123";
537 int err = 0;
538
539 snprintf(target, sizeof(target), "/mnt/%s", device);
540 mkdir_p(target);
541
542 if (check_fs)
543 check_filesystem(pr);
544
545 err = mount(pr->dev, target, pr->id->name, 0, "");
546 if (err)
547 fprintf(stderr, "mounting %s (%s) as %s failed (%d) - %s\n",
548 pr->dev, pr->id->name, target, err, strerror(err));
549 return err;
550 }
551
552 return 0;
553 }
554
555 static int umount_device(struct blkid_struct_probe *pr)
556 {
557 struct mount *m;
558 char *device = basename(pr->dev);
559 char *mp;
560 int err;
561
562 if (!pr)
563 return -1;
564
565 if (!strcmp(pr->id->name, "swap"))
566 return -1;
567
568 mp = find_mount_point(pr->dev);
569 if (!mp)
570 return -1;
571
572 m = find_block(pr->uuid, pr->label, device, NULL);
573 if (m && m->extroot)
574 return -1;
575
576 err = umount2(mp, MNT_DETACH);
577 if (err)
578 fprintf(stderr, "unmounting %s (%s) failed (%d) - %s\n",
579 pr->dev, mp, err, strerror(err));
580 else
581 fprintf(stderr, "unmounted %s (%s)\n",
582 pr->dev, mp);
583
584 return err;
585 }
586
587 static int main_hotplug(int argc, char **argv)
588 {
589 char path[32];
590 char *action, *device, *mount_point;
591
592 action = getenv("ACTION");
593 device = getenv("DEVNAME");
594
595 if (!action || !device)
596 return -1;
597 snprintf(path, sizeof(path), "/dev/%s", device);
598
599 if (!strcmp(action, "remove")) {
600 int err = 0;
601 mount_point = find_mount_point(path);
602 if (mount_point)
603 err = umount2(mount_point, MNT_DETACH);
604
605 if (err)
606 fprintf(stderr, "umount of %s failed (%d) - %s\n",
607 mount_point, err, strerror(err));
608
609 return 0;
610 } else if (strcmp(action, "add")) {
611 fprintf(stderr, "Unkown action %s\n", action);
612
613 return -1;
614 }
615
616 if (config_load(NULL))
617 return -1;
618 cache_load(0);
619
620 return mount_device(find_block_info(NULL, NULL, path), 1);
621 }
622
623 static int find_block_mtd(char *name, char *part, int plen)
624 {
625 FILE *fp = fopen("/proc/mtd", "r");
626 static char line[256];
627 char *index = NULL;
628
629 if(!fp)
630 return -1;
631
632 while (!index && fgets(line, sizeof(line), fp)) {
633 if (strstr(line, name)) {
634 char *eol = strstr(line, ":");
635
636 if (!eol)
637 continue;
638
639 *eol = '\0';
640 index = &line[3];
641 }
642 }
643
644 fclose(fp);
645
646 if (!index)
647 return -1;
648
649 snprintf(part, plen, "/dev/mtdblock%s", index);
650
651 return 0;
652 }
653
654 static int check_extroot(char *path)
655 {
656 struct blkid_struct_probe *pr = NULL;
657 char fs[32];
658
659 if (find_block_mtd("rootfs", fs, sizeof(fs)))
660 return -1;
661
662 list_for_each_entry(pr, &devices, list) {
663 if (!strcmp(pr->dev, fs)) {
664 struct stat s;
665 FILE *fp = NULL;
666 char tag[32];
667 char uuid[32] = { 0 };
668
669 snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
670 if (stat(tag, &s)) {
671 fp = fopen(tag, "w+");
672 if (!fp) {
673 fprintf(stderr, "extroot: failed to write uuid tag file\n");
674 /* return 0 to continue boot regardless of error */
675 return 0;
676 }
677 fputs(pr->uuid, fp);
678 fclose(fp);
679 return 0;
680 }
681
682 fp = fopen(tag, "r");
683 if (!fp) {
684 fprintf(stderr, "extroot: failed to open uuid tag file\n");
685 return -1;
686 }
687
688 fgets(uuid, sizeof(uuid), fp);
689 fclose(fp);
690 if (!strcmp(uuid, pr->uuid))
691 return 0;
692 fprintf(stderr, "extroot: uuid tag does not match rom uuid\n");
693 }
694 }
695 return -1;
696 }
697
698 static int mount_extroot(char *cfg)
699 {
700 char overlay[] = "/tmp/overlay";
701 char mnt[] = "/tmp/mnt";
702 char *path = mnt;
703 struct blkid_struct_probe *pr;
704 struct mount *m;
705 int err = -1;
706
707 if (config_load(cfg))
708 return -2;
709
710 m = find_block(NULL, NULL, NULL, "/");
711 if (!m)
712 m = find_block(NULL, NULL, NULL, "/overlay");
713
714 if (!m || !m->extroot)
715 return -1;
716
717 pr = find_block_info(m->uuid, m->label, NULL);
718
719 if (!pr && delay_root){
720 fprintf(stderr, "extroot: is not ready yet, retrying in %ui seconds\n", delay_root);
721 sleep(delay_root);
722 mkblkdev();
723 cache_load(0);
724 pr = find_block_info(m->uuid, m->label, NULL);
725 }
726 if (pr) {
727 if (strncmp(pr->id->name, "ext", 3)) {
728 fprintf(stderr, "extroot: %s is not supported, try ext4\n", pr->id->name);
729 return -1;
730 }
731 if (m->overlay)
732 path = overlay;
733 mkdir_p(path);
734
735 if (check_fs)
736 check_filesystem(pr);
737
738 err = mount(pr->dev, path, pr->id->name, 0, (m->options) ? (m->options) : (""));
739
740 if (err) {
741 fprintf(stderr, "mounting %s (%s) as %s failed (%d) - %s\n",
742 pr->dev, pr->id->name, path, err, strerror(err));
743 } else if (m->overlay) {
744 err = check_extroot(path);
745 if (err)
746 umount(path);
747 }
748 }
749
750 return err;
751 }
752
753 static int main_extroot(int argc, char **argv)
754 {
755 struct blkid_struct_probe *pr;
756 char fs[32] = { 0 };
757 char fs_data[32] = { 0 };
758 int err = -1;
759
760 if (!getenv("PREINIT"))
761 return -1;
762
763 if (argc != 2) {
764 fprintf(stderr, "Usage: block extroot mountpoint\n");
765 return -1;
766 }
767
768 mkblkdev();
769 cache_load(1);
770
771 find_block_mtd("rootfs", fs, sizeof(fs));
772 if (!fs[0])
773 return -2;
774
775 pr = find_block_info(NULL, NULL, fs);
776 if (!pr)
777 return -3;
778
779 find_block_mtd("rootfs_data", fs_data, sizeof(fs_data));
780 if (fs_data[0]) {
781 pr = find_block_info(NULL, NULL, fs_data);
782 if (pr && !strcmp(pr->id->name, "jffs2")) {
783 char cfg[] = "/tmp/jffs_cfg";
784
785 mkdir_p(cfg);
786 if (!mount(fs_data, cfg, "jffs2", MS_NOATIME, NULL)) {
787 err = mount_extroot(cfg);
788 umount2(cfg, MNT_DETACH);
789 }
790 if (err < 0)
791 rmdir("/tmp/overlay");
792 rmdir(cfg);
793 return err;
794 }
795 }
796
797 return mount_extroot(NULL);
798 }
799
800 static int main_mount(int argc, char **argv)
801 {
802 struct blkid_struct_probe *pr;
803
804 if (config_load(NULL))
805 return -1;
806
807 cache_load(1);
808 list_for_each_entry(pr, &devices, list)
809 mount_device(pr, 0);
810
811 return 0;
812 }
813
814 static int main_umount(int argc, char **argv)
815 {
816 struct blkid_struct_probe *pr;
817
818 if (config_load(NULL))
819 return -1;
820
821 cache_load(0);
822 list_for_each_entry(pr, &devices, list)
823 umount_device(pr);
824
825 return 0;
826 }
827
828 static int main_detect(int argc, char **argv)
829 {
830 struct blkid_struct_probe *pr;
831
832 cache_load(0);
833 printf("config 'global'\n");
834 printf("\toption\tanon_swap\t'0'\n");
835 printf("\toption\tanon_mount\t'0'\n");
836 printf("\toption\tauto_swap\t'1'\n");
837 printf("\toption\tauto_mount\t'1'\n");
838 printf("\toption\tdelay_root\t'0'\n");
839 printf("\toption\tcheck_fs\t'0'\n\n");
840 list_for_each_entry(pr, &devices, list)
841 print_block_uci(pr);
842
843 return 0;
844 }
845
846 static int main_info(int argc, char **argv)
847 {
848 int i;
849 struct blkid_struct_probe *pr;
850
851 cache_load(1);
852 if (argc == 2) {
853 list_for_each_entry(pr, &devices, list)
854 print_block_info(pr);
855
856 return 0;
857 };
858
859 for (i = 2; i < argc; i++) {
860 struct stat s;
861
862 if (stat(argv[i], &s)) {
863 fprintf(stderr, "failed to stat %s\n", argv[i]);
864 continue;
865 }
866 if (!S_ISBLK(s.st_mode)) {
867 fprintf(stderr, "%s is not a block device\n", argv[i]);
868 continue;
869 }
870 pr = find_block_info(NULL, NULL, argv[i]);
871 if (pr)
872 print_block_info(pr);
873 }
874
875 return 0;
876 }
877
878 static int main_swapon(int argc, char **argv)
879 {
880 if (argc != 2) {
881 fprintf(stderr, "Usage: swapon <-s> <-a> [DEVICE]\n\n\tStart swapping on [DEVICE]\n -a\tStart swapping on all swap devices\n -s\tShow summary\n");
882 return -1;
883 }
884
885 if (!strcmp(argv[1], "-s")) {
886 FILE *fp = fopen("/proc/swaps", "r");
887 char *lineptr = NULL;
888 size_t s;
889
890 if (!fp) {
891 fprintf(stderr, "failed to open /proc/swaps\n");
892 return -1;
893 }
894 while (getline(&lineptr, &s, fp) > 0)
895 printf(lineptr);
896 if (lineptr)
897 free(lineptr);
898 fclose(fp);
899 } else if (!strcmp(argv[1], "-a")) {
900 struct blkid_struct_probe *pr;
901
902 cache_load(0);
903 list_for_each_entry(pr, &devices, list) {
904 if (strcmp(pr->id->name, "swap"))
905 continue;
906 if (swapon(pr->dev, 0))
907 fprintf(stderr, "failed to swapon %s\n", pr->dev);
908 }
909 } else {
910 struct stat s;
911 int err;
912
913 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
914 fprintf(stderr, "%s is not a block device or file\n", argv[1]);
915 return -1;
916 }
917 err = swapon(argv[1], 0);
918 if (err) {
919 fprintf(stderr, "failed to swapon %s (%d)\n", argv[1], err);
920 return err;
921 }
922 }
923
924 return 0;
925 }
926
927 static int main_swapoff(int argc, char **argv)
928 {
929 if (argc != 2) {
930 fprintf(stderr, "Usage: swapoff [-a] [DEVICE]\n\n\tStop swapping on DEVICE\n -a\tStop swapping on all swap devices\n");
931 return -1;
932 }
933
934 if (!strcmp(argv[1], "-a")) {
935 FILE *fp = fopen("/proc/swaps", "r");
936 char line[256];
937
938 if (!fp) {
939 fprintf(stderr, "failed to open /proc/swaps\n");
940 return -1;
941 }
942 fgets(line, sizeof(line), fp);
943 while (fgets(line, sizeof(line), fp)) {
944 char *end = strchr(line, ' ');
945 int err;
946
947 if (!end)
948 continue;
949 *end = '\0';
950 err = swapoff(line);
951 if (err)
952 fprintf(stderr, "failed to swapoff %s (%d)\n", line, err);
953 }
954 fclose(fp);
955 } else {
956 struct stat s;
957 int err;
958
959 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
960 fprintf(stderr, "%s is not a block device or file\n", argv[1]);
961 return -1;
962 }
963 err = swapoff(argv[1]);
964 if (err) {
965 fprintf(stderr, "fsiled to swapoff %s (%d)\n", argv[1], err);
966 return err;
967 }
968 }
969
970 return 0;
971 }
972
973 int main(int argc, char **argv)
974 {
975 char *base = basename(*argv);
976
977 umask(0);
978
979 if (!strcmp(base, "swapon"))
980 return main_swapon(argc, argv);
981
982 if (!strcmp(base, "swapoff"))
983 return main_swapoff(argc, argv);
984
985 if ((argc > 1) && !strcmp(base, "block")) {
986 if (!strcmp(argv[1], "info"))
987 return main_info(argc, argv);
988
989 if (!strcmp(argv[1], "detect"))
990 return main_detect(argc, argv);
991
992 if (!strcmp(argv[1], "hotplug"))
993 return main_hotplug(argc, argv);
994
995 if (!strcmp(argv[1], "extroot"))
996 return main_extroot(argc, argv);
997
998 if (!strcmp(argv[1], "mount"))
999 return main_mount(argc, argv);
1000
1001 if (!strcmp(argv[1], "umount"))
1002 return main_umount(argc, argv);
1003 }
1004
1005 fprintf(stderr, "Usage: block <info|mount|umount|detect>\n");
1006
1007 return -1;
1008 }