support for ubifs overlay
[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
23 #include <sys/stat.h>
24 #include <sys/types.h>
25 #include <sys/swap.h>
26 #include <sys/mount.h>
27 #include <sys/wait.h>
28
29 #include <uci.h>
30 #include <uci_blob.h>
31
32 #include <libubox/list.h>
33 #include <libubox/vlist.h>
34 #include <libubox/blobmsg_json.h>
35 #include <libubox/avl-cmp.h>
36
37 #include "libblkid-tiny/libblkid-tiny.h"
38
39 #define ERROR(fmt, ...) do { \
40 syslog(LOG_ERR, fmt, ## __VA_ARGS__); \
41 fprintf(stderr, "block: "fmt, ## __VA_ARGS__); \
42 } while (0)
43
44 enum {
45 TYPE_MOUNT,
46 TYPE_SWAP,
47 };
48
49 struct mount {
50 struct vlist_node node;
51 int type;
52
53 char *target;
54 char *path;
55 char *options;
56 uint32_t flags;
57 char *uuid;
58 char *label;
59 char *device;
60 int extroot;
61 int overlay;
62 int disabled_fsck;
63 unsigned int prio;
64 };
65
66 static struct vlist_tree mounts;
67 static struct blob_buf b;
68 static LIST_HEAD(devices);
69 static int anon_mount, anon_swap, auto_mount, auto_swap, check_fs;
70 static unsigned int delay_root;
71
72 enum {
73 CFG_ANON_MOUNT,
74 CFG_ANON_SWAP,
75 CFG_AUTO_MOUNT,
76 CFG_AUTO_SWAP,
77 CFG_DELAY_ROOT,
78 CFG_CHECK_FS,
79 __CFG_MAX
80 };
81
82 static const struct blobmsg_policy config_policy[__CFG_MAX] = {
83 [CFG_ANON_SWAP] = { .name = "anon_swap", .type = BLOBMSG_TYPE_INT32 },
84 [CFG_ANON_MOUNT] = { .name = "anon_mount", .type = BLOBMSG_TYPE_INT32 },
85 [CFG_AUTO_SWAP] = { .name = "auto_swap", .type = BLOBMSG_TYPE_INT32 },
86 [CFG_AUTO_MOUNT] = { .name = "auto_mount", .type = BLOBMSG_TYPE_INT32 },
87 [CFG_DELAY_ROOT] = { .name = "delay_root", .type = BLOBMSG_TYPE_INT32 },
88 [CFG_CHECK_FS] = { .name = "check_fs", .type = BLOBMSG_TYPE_INT32 },
89 };
90
91 enum {
92 MOUNT_UUID,
93 MOUNT_LABEL,
94 MOUNT_ENABLE,
95 MOUNT_TARGET,
96 MOUNT_DEVICE,
97 MOUNT_OPTIONS,
98 __MOUNT_MAX
99 };
100
101 static const struct uci_blob_param_list config_attr_list = {
102 .n_params = __CFG_MAX,
103 .params = config_policy,
104 };
105
106 static const struct blobmsg_policy mount_policy[__MOUNT_MAX] = {
107 [MOUNT_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
108 [MOUNT_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
109 [MOUNT_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
110 [MOUNT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
111 [MOUNT_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_STRING },
112 [MOUNT_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
113 };
114
115 static const struct uci_blob_param_list mount_attr_list = {
116 .n_params = __MOUNT_MAX,
117 .params = mount_policy,
118 };
119
120 enum {
121 SWAP_ENABLE,
122 SWAP_UUID,
123 SWAP_LABEL,
124 SWAP_DEVICE,
125 SWAP_PRIO,
126 __SWAP_MAX
127 };
128
129 static const struct blobmsg_policy swap_policy[__SWAP_MAX] = {
130 [SWAP_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
131 [SWAP_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
132 [SWAP_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
133 [SWAP_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
134 [SWAP_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 },
135 };
136
137 static const struct uci_blob_param_list swap_attr_list = {
138 .n_params = __SWAP_MAX,
139 .params = swap_policy,
140 };
141
142 struct mount_flag {
143 const char *name;
144 int32_t flag;
145 };
146
147 #ifndef MS_DIRSYNC
148 # define MS_DIRSYNC (1 << 7)
149 #endif
150
151 #ifndef MS_RELATIME
152 # define MS_RELATIME (1 << 21)
153 #endif
154
155 #ifndef MS_STRICTATIME
156 # define MS_STRICTATIME (1 << 24)
157 #endif
158
159 static const struct mount_flag mount_flags[] = {
160 { "sync", MS_SYNCHRONOUS },
161 { "async", ~MS_SYNCHRONOUS },
162 { "dirsync", MS_DIRSYNC },
163 { "mand", MS_MANDLOCK },
164 { "nomand", ~MS_MANDLOCK },
165 { "atime", ~MS_NOATIME },
166 { "noatime", MS_NOATIME },
167 { "dev", ~MS_NODEV },
168 { "nodev", MS_NODEV },
169 { "diratime", ~MS_NODIRATIME },
170 { "nodiratime", MS_NODIRATIME },
171 { "exec", ~MS_NOEXEC },
172 { "noexec", MS_NOEXEC },
173 { "suid", ~MS_NOSUID },
174 { "nosuid", MS_NOSUID },
175 { "rw", ~MS_RDONLY },
176 { "ro", MS_RDONLY },
177 { "relatime", MS_RELATIME },
178 { "norelatime", ~MS_RELATIME },
179 { "strictatime", MS_STRICTATIME },
180 };
181
182 static char *blobmsg_get_strdup(struct blob_attr *attr)
183 {
184 if (!attr)
185 return NULL;
186
187 return strdup(blobmsg_get_string(attr));
188 }
189
190 static char *blobmsg_get_basename(struct blob_attr *attr)
191 {
192 if (!attr)
193 return NULL;
194
195 return strdup(basename(blobmsg_get_string(attr)));
196 }
197
198 static void parse_mount_options(struct mount *m, char *optstr)
199 {
200 int i;
201 bool is_flag;
202 char *p, *opts, *last;
203
204 m->flags = 0;
205 m->options = NULL;
206
207 if (!optstr || !*optstr)
208 return;
209
210 m->options = opts = calloc(1, strlen(optstr) + 1);
211
212 if (!m->options)
213 return;
214
215 p = last = optstr;
216
217 do {
218 p = strchr(p, ',');
219
220 if (p)
221 *p++ = 0;
222
223 for (i = 0, is_flag = false; i < ARRAY_SIZE(mount_flags); i++) {
224 if (!strcmp(last, mount_flags[i].name)) {
225 if (mount_flags[i].flag < 0)
226 m->flags &= (uint32_t)mount_flags[i].flag;
227 else
228 m->flags |= (uint32_t)mount_flags[i].flag;
229 is_flag = true;
230 break;
231 }
232 }
233
234 if (!is_flag)
235 opts += sprintf(opts, "%s%s", (opts > m->options) ? "," : "", last);
236
237 last = p;
238
239 } while (p);
240
241 free(optstr);
242 }
243
244 static int mount_add(struct uci_section *s)
245 {
246 struct blob_attr *tb[__MOUNT_MAX] = { 0 };
247 struct mount *m;
248
249 blob_buf_init(&b, 0);
250 uci_to_blob(&b, s, &mount_attr_list);
251 blobmsg_parse(mount_policy, __MOUNT_MAX, tb, blob_data(b.head), blob_len(b.head));
252
253 if (!tb[MOUNT_LABEL] && !tb[MOUNT_UUID] && !tb[MOUNT_DEVICE])
254 return -1;
255
256 if (tb[MOUNT_ENABLE] && !blobmsg_get_u32(tb[MOUNT_ENABLE]))
257 return -1;
258
259 m = malloc(sizeof(struct mount));
260 m->type = TYPE_MOUNT;
261 m->uuid = blobmsg_get_strdup(tb[MOUNT_UUID]);
262 m->label = blobmsg_get_strdup(tb[MOUNT_LABEL]);
263 m->target = blobmsg_get_strdup(tb[MOUNT_TARGET]);
264 m->device = blobmsg_get_basename(tb[MOUNT_DEVICE]);
265
266 parse_mount_options(m, blobmsg_get_strdup(tb[MOUNT_OPTIONS]));
267
268 m->overlay = m->extroot = 0;
269 if (m->target && !strcmp(m->target, "/"))
270 m->extroot = 1;
271 if (m->target && !strcmp(m->target, "/overlay"))
272 m->extroot = m->overlay = 1;
273
274 if (m->uuid)
275 vlist_add(&mounts, &m->node, m->uuid);
276 else if (m->label)
277 vlist_add(&mounts, &m->node, m->label);
278 else if (m->device)
279 vlist_add(&mounts, &m->node, m->device);
280
281 return 0;
282 }
283
284 static int swap_add(struct uci_section *s)
285 {
286 struct blob_attr *tb[__SWAP_MAX] = { 0 };
287 struct mount *m;
288
289 blob_buf_init(&b, 0);
290 uci_to_blob(&b, s, &swap_attr_list);
291 blobmsg_parse(swap_policy, __SWAP_MAX, tb, blob_data(b.head), blob_len(b.head));
292
293 if (!tb[SWAP_UUID] && !tb[SWAP_LABEL] && !tb[SWAP_DEVICE])
294 return -1;
295
296 m = malloc(sizeof(struct mount));
297 memset(m, 0, sizeof(struct mount));
298 m->type = TYPE_SWAP;
299 m->uuid = blobmsg_get_strdup(tb[SWAP_UUID]);
300 m->label = blobmsg_get_strdup(tb[SWAP_LABEL]);
301 m->device = blobmsg_get_basename(tb[SWAP_DEVICE]);
302 if (tb[SWAP_PRIO])
303 m->prio = blobmsg_get_u32(tb[SWAP_PRIO]);
304 if (m->prio)
305 m->prio = ((m->prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
306
307 if ((!tb[SWAP_ENABLE]) || blobmsg_get_u32(tb[SWAP_ENABLE])) {
308 /* store complete swap path */
309 if (tb[SWAP_DEVICE])
310 m->target = blobmsg_get_strdup(tb[SWAP_DEVICE]);
311
312 if (m->uuid)
313 vlist_add(&mounts, &m->node, m->uuid);
314 else if (m->label)
315 vlist_add(&mounts, &m->node, m->label);
316 else if (m->device)
317 vlist_add(&mounts, &m->node, m->device);
318 }
319
320 return 0;
321 }
322
323 static int global_add(struct uci_section *s)
324 {
325 struct blob_attr *tb[__CFG_MAX] = { 0 };
326
327 blob_buf_init(&b, 0);
328 uci_to_blob(&b, s, &config_attr_list);
329 blobmsg_parse(config_policy, __CFG_MAX, tb, blob_data(b.head), blob_len(b.head));
330
331 if ((tb[CFG_ANON_MOUNT]) && blobmsg_get_u32(tb[CFG_ANON_MOUNT]))
332 anon_mount = 1;
333 if ((tb[CFG_ANON_SWAP]) && blobmsg_get_u32(tb[CFG_ANON_SWAP]))
334 anon_swap = 1;
335
336 if ((tb[CFG_AUTO_MOUNT]) && blobmsg_get_u32(tb[CFG_AUTO_MOUNT]))
337 auto_mount = 1;
338 if ((tb[CFG_AUTO_SWAP]) && blobmsg_get_u32(tb[CFG_AUTO_SWAP]))
339 auto_swap = 1;
340
341 if (tb[CFG_DELAY_ROOT])
342 delay_root = blobmsg_get_u32(tb[CFG_DELAY_ROOT]);
343
344 if ((tb[CFG_CHECK_FS]) && blobmsg_get_u32(tb[CFG_CHECK_FS]))
345 check_fs = 1;
346
347 return 0;
348 }
349
350 static struct mount* find_swap(const char *uuid, const char *label, const char *device)
351 {
352 struct mount *m;
353
354 vlist_for_each_element(&mounts, m, node) {
355 if (m->type != TYPE_SWAP)
356 continue;
357 if (uuid && m->uuid && !strcmp(m->uuid, uuid))
358 return m;
359 if (label && m->label && !strcmp(m->label, label))
360 return m;
361 if (device && m->device && !strcmp(m->device, device))
362 return m;
363 }
364
365 return NULL;
366 }
367
368 static struct mount* find_block(const char *uuid, const char *label, const char *device,
369 const char *target)
370 {
371 struct mount *m;
372
373 vlist_for_each_element(&mounts, m, node) {
374 if (m->type != TYPE_MOUNT)
375 continue;
376 if (m->uuid && uuid && !strcmp(m->uuid, uuid))
377 return m;
378 if (m->label && label && !strcmp(m->label, label))
379 return m;
380 if (m->target && target && !strcmp(m->target, target))
381 return m;
382 if (m->device && device && !strcmp(m->device, device))
383 return m;
384 }
385
386 return NULL;
387 }
388
389 static void mounts_update(struct vlist_tree *tree, struct vlist_node *node_new,
390 struct vlist_node *node_old)
391 {
392 }
393
394 static int config_load(char *cfg)
395 {
396 struct uci_context *ctx;
397 struct uci_package *pkg;
398 struct uci_element *e;
399
400 vlist_init(&mounts, avl_strcmp, mounts_update);
401
402 ctx = uci_alloc_context();
403 if (cfg) {
404 char path[32];
405 snprintf(path, 32, "%s/etc/config", cfg);
406 uci_set_confdir(ctx, path);
407 }
408
409 if (uci_load(ctx, "fstab", &pkg))
410 {
411 char *err;
412 uci_get_errorstr(ctx, &err, "fstab");
413 ERROR("extroot: failed to load %s/etc/config/%s\n",
414 cfg ? cfg : "", err);
415 free(err);
416 return -1;
417 }
418
419 vlist_update(&mounts);
420 uci_foreach_element(&pkg->sections, e) {
421 struct uci_section *s = uci_to_section(e);
422
423 if (!strcmp(s->type, "mount"))
424 mount_add(s);
425 if (!strcmp(s->type, "swap"))
426 swap_add(s);
427 if (!strcmp(s->type, "global"))
428 global_add(s);
429 }
430 vlist_flush(&mounts);
431
432 return 0;
433 }
434
435 static struct blkid_struct_probe* _probe_path(char *path)
436 {
437 struct blkid_struct_probe *pr;
438
439 pr = malloc(sizeof(*pr));
440
441 if (!pr)
442 return NULL;
443
444 memset(pr, 0, sizeof(*pr));
445 probe_block(path, pr);
446
447 if (pr->err || !pr->id) {
448 free(pr);
449 return NULL;
450 }
451
452 return pr;
453 }
454
455 static int _cache_load(const char *path)
456 {
457 int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
458 int j;
459 glob_t gl;
460
461 if (glob(path, gl_flags, NULL, &gl) < 0)
462 return -1;
463
464 for (j = 0; j < gl.gl_pathc; j++) {
465 struct blkid_struct_probe *pr = _probe_path(gl.gl_pathv[j]);
466 if (pr)
467 list_add_tail(&pr->list, &devices);
468 }
469
470 globfree(&gl);
471
472 return 0;
473 }
474
475 static void cache_load(int mtd)
476 {
477 if (mtd) {
478 _cache_load("/dev/mtdblock*");
479 _cache_load("/dev/ubiblock*");
480 }
481 _cache_load("/dev/mmcblk*");
482 _cache_load("/dev/sd*");
483 _cache_load("/dev/hd*");
484 _cache_load("/dev/md*");
485 _cache_load("/dev/mapper/*");
486 }
487
488 static int print_block_info(struct blkid_struct_probe *pr)
489 {
490 printf("%s:", pr->dev);
491 if (pr->uuid[0])
492 printf(" UUID=\"%s\"", pr->uuid);
493
494 if (pr->label[0])
495 printf(" LABEL=\"%s\"", pr->label);
496
497 if (pr->name[0])
498 printf(" NAME=\"%s\"", pr->name);
499
500 if (pr->version[0])
501 printf(" VERSION=\"%s\"", pr->version);
502
503 printf(" TYPE=\"%s\"\n", pr->id->name);
504
505 return 0;
506 }
507
508 static int print_block_uci(struct blkid_struct_probe *pr)
509 {
510 if (!strcmp(pr->id->name, "swap")) {
511 printf("config 'swap'\n");
512 } else {
513 printf("config 'mount'\n");
514 printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev));
515 }
516 if (pr->uuid[0])
517 printf("\toption\tuuid\t'%s'\n", pr->uuid);
518 else
519 printf("\toption\tdevice\t'%s'\n", pr->dev);
520 printf("\toption\tenabled\t'0'\n\n");
521
522 return 0;
523 }
524
525 static struct blkid_struct_probe* find_block_info(char *uuid, char *label, char *path)
526 {
527 struct blkid_struct_probe *pr = NULL;
528
529 if (uuid)
530 list_for_each_entry(pr, &devices, list)
531 if (!strcmp(pr->uuid, uuid))
532 return pr;
533
534 if (label)
535 list_for_each_entry(pr, &devices, list)
536 if (!strcmp(pr->label, label))
537 return pr;
538
539 if (path)
540 list_for_each_entry(pr, &devices, list)
541 if (!strcmp(basename(pr->dev), basename(path)))
542 return pr;
543
544 return NULL;
545 }
546
547 static char* find_mount_point(char *block)
548 {
549 FILE *fp = fopen("/proc/mounts", "r");
550 static char line[256];
551 int len = strlen(block);
552 char *point = NULL;
553
554 if(!fp)
555 return NULL;
556
557 while (fgets(line, sizeof(line), fp)) {
558 if (!strncmp(line, block, len)) {
559 char *p = &line[len + 1];
560 char *t = strstr(p, " ");
561
562 if (!t) {
563 fclose(fp);
564 return NULL;
565 }
566 *t = '\0';
567 point = p;
568 break;
569 }
570 }
571
572 fclose(fp);
573
574 return point;
575 }
576
577 static void mkdir_p(char *dir)
578 {
579 char *l = strrchr(dir, '/');
580
581 if (l) {
582 *l = '\0';
583 mkdir_p(dir);
584 *l = '/';
585 mkdir(dir, 0755);
586 }
587 }
588
589 static void check_filesystem(struct blkid_struct_probe *pr)
590 {
591 pid_t pid;
592 struct stat statbuf;
593 char *e2fsck = "/usr/sbin/e2fsck";
594
595 if (strncmp(pr->id->name, "ext", 3)) {
596 ERROR("check_filesystem: %s is not supported\n", pr->id->name);
597 return;
598 }
599
600 if (stat(e2fsck, &statbuf) < 0) {
601 ERROR("check_filesystem: %s not found\n", e2fsck);
602 return;
603 }
604
605 pid = fork();
606 if (!pid) {
607 execl(e2fsck, e2fsck, "-p", pr->dev, NULL);
608 exit(-1);
609 } else if (pid > 0) {
610 int status;
611
612 waitpid(pid, &status, 0);
613 if (WEXITSTATUS(status))
614 ERROR("check_filesystem: %s returned %d\n", e2fsck, WEXITSTATUS(status));
615 }
616 }
617
618 static void handle_swapfiles(bool on)
619 {
620 struct stat s;
621 struct mount *m;
622 struct blkid_struct_probe *pr;
623
624 vlist_for_each_element(&mounts, m, node)
625 {
626 if (m->type != TYPE_SWAP || !m->target)
627 continue;
628
629 if (stat(m->target, &s) || !S_ISREG(s.st_mode))
630 continue;
631
632 pr = _probe_path(m->target);
633
634 if (!pr)
635 continue;
636
637 if (!strcmp(pr->id->name, "swap")) {
638 if (on)
639 swapon(pr->dev, m->prio);
640 else
641 swapoff(pr->dev);
642 }
643
644 free(pr);
645 }
646 }
647
648 static int mount_device(struct blkid_struct_probe *pr, int hotplug)
649 {
650 struct mount *m;
651 char *device;
652
653 if (!pr)
654 return -1;
655
656 device = basename(pr->dev);
657
658 if (!strcmp(pr->id->name, "swap")) {
659 if (hotplug && !auto_swap)
660 return -1;
661 m = find_swap(pr->uuid, pr->label, device);
662 if (m || anon_swap)
663 swapon(pr->dev, (m) ? (m->prio) : (0));
664
665 return 0;
666 }
667
668 if (hotplug && !auto_mount)
669 return -1;
670
671 if (find_mount_point(pr->dev)) {
672 ERROR("%s is already mounted\n", pr->dev);
673 return -1;
674 }
675
676 m = find_block(pr->uuid, pr->label, device, NULL);
677 if (m && m->extroot)
678 return -1;
679
680 if (m) {
681 char *target = m->target;
682 char _target[32];
683 int err = 0;
684
685 if (!target) {
686 snprintf(_target, sizeof(_target), "/mnt/%s", device);
687 target = _target;
688 }
689 mkdir_p(target);
690
691 if (check_fs)
692 check_filesystem(pr);
693
694 err = mount(pr->dev, target, pr->id->name, m->flags,
695 (m->options) ? (m->options) : (""));
696 if (err)
697 ERROR("mounting %s (%s) as %s failed (%d) - %s\n",
698 pr->dev, pr->id->name, target, err, strerror(err));
699 else
700 handle_swapfiles(true);
701 return err;
702 }
703
704 if (anon_mount) {
705 char target[] = "/mnt/mmcblk123";
706 int err = 0;
707
708 snprintf(target, sizeof(target), "/mnt/%s", device);
709 mkdir_p(target);
710
711 if (check_fs)
712 check_filesystem(pr);
713
714 err = mount(pr->dev, target, pr->id->name, 0, "");
715 if (err)
716 ERROR("mounting %s (%s) as %s failed (%d) - %s\n",
717 pr->dev, pr->id->name, target, err, strerror(err));
718 else
719 handle_swapfiles(true);
720 return err;
721 }
722
723 return 0;
724 }
725
726 static int umount_device(struct blkid_struct_probe *pr)
727 {
728 struct mount *m;
729 char *device = basename(pr->dev);
730 char *mp;
731 int err;
732
733 if (!pr)
734 return -1;
735
736 if (!strcmp(pr->id->name, "swap"))
737 return -1;
738
739 mp = find_mount_point(pr->dev);
740 if (!mp)
741 return -1;
742
743 m = find_block(pr->uuid, pr->label, device, NULL);
744 if (m && m->extroot)
745 return -1;
746
747 err = umount2(mp, MNT_DETACH);
748 if (err)
749 ERROR("unmounting %s (%s) failed (%d) - %s\n",
750 pr->dev, mp, err, strerror(err));
751 else
752 ERROR("unmounted %s (%s)\n",
753 pr->dev, mp);
754
755 return err;
756 }
757
758 static int main_hotplug(int argc, char **argv)
759 {
760 char path[32];
761 char *action, *device, *mount_point;
762
763 action = getenv("ACTION");
764 device = getenv("DEVNAME");
765
766 if (!action || !device)
767 return -1;
768 snprintf(path, sizeof(path), "/dev/%s", device);
769
770 if (!strcmp(action, "remove")) {
771 int err = 0;
772 mount_point = find_mount_point(path);
773 if (mount_point)
774 err = umount2(mount_point, MNT_DETACH);
775
776 if (err)
777 ERROR("umount of %s failed (%d) - %s\n",
778 mount_point, err, strerror(err));
779
780 return 0;
781 } else if (strcmp(action, "add")) {
782 ERROR("Unkown action %s\n", action);
783
784 return -1;
785 }
786
787 if (config_load(NULL))
788 return -1;
789 cache_load(0);
790
791 return mount_device(find_block_info(NULL, NULL, path), 1);
792 }
793
794 static int find_block_mtd(char *name, char *part, int plen)
795 {
796 FILE *fp = fopen("/proc/mtd", "r");
797 static char line[256];
798 char *index = NULL;
799
800 if(!fp)
801 return -1;
802
803 while (!index && fgets(line, sizeof(line), fp)) {
804 if (strstr(line, name)) {
805 char *eol = strstr(line, ":");
806
807 if (!eol)
808 continue;
809
810 *eol = '\0';
811 index = &line[3];
812 }
813 }
814
815 fclose(fp);
816
817 if (!index)
818 return -1;
819
820 snprintf(part, plen, "/dev/mtdblock%s", index);
821
822 return 0;
823 }
824
825 static int check_extroot(char *path)
826 {
827 struct blkid_struct_probe *pr = NULL;
828 char fs[32];
829
830 if (find_block_mtd("rootfs", fs, sizeof(fs)))
831 return -1;
832
833 list_for_each_entry(pr, &devices, list) {
834 if (!strcmp(pr->dev, fs)) {
835 struct stat s;
836 FILE *fp = NULL;
837 char tag[64];
838 char uuid[64] = { 0 };
839
840 snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
841 if (stat(tag, &s)) {
842 fp = fopen(tag, "w+");
843 if (!fp) {
844 ERROR("extroot: failed to write uuid tag file\n");
845 /* return 0 to continue boot regardless of error */
846 return 0;
847 }
848 fputs(pr->uuid, fp);
849 fclose(fp);
850 return 0;
851 }
852
853 fp = fopen(tag, "r");
854 if (!fp) {
855 ERROR("extroot: failed to open uuid tag file\n");
856 return -1;
857 }
858
859 fgets(uuid, sizeof(uuid), fp);
860 fclose(fp);
861 if (!strcmp(uuid, pr->uuid))
862 return 0;
863 ERROR("extroot: uuid tag does not match rom uuid\n");
864 }
865 }
866 return -1;
867 }
868
869 static int mount_extroot(char *cfg)
870 {
871 char overlay[] = "/tmp/extroot/overlay";
872 char mnt[] = "/tmp/extroot/mnt";
873 char *path = mnt;
874 struct blkid_struct_probe *pr;
875 struct mount *m;
876 int err = -1;
877
878 if (config_load(cfg))
879 return -2;
880
881 m = find_block(NULL, NULL, NULL, "/");
882 if (!m)
883 m = find_block(NULL, NULL, NULL, "/overlay");
884
885 if (!m || !m->extroot)
886 {
887 ERROR("extroot: no root or overlay mount defined\n");
888 return -1;
889 }
890
891 pr = find_block_info(m->uuid, m->label, m->device);
892
893 if (!pr && delay_root){
894 ERROR("extroot: is not ready yet, retrying in %u seconds\n", delay_root);
895 sleep(delay_root);
896 mkblkdev();
897 cache_load(0);
898 pr = find_block_info(m->uuid, m->label, m->device);
899 }
900 if (pr) {
901 if (strncmp(pr->id->name, "ext", 3)) {
902 ERROR("extroot: %s is not supported, try ext4\n", pr->id->name);
903 return -1;
904 }
905 if (m->overlay)
906 path = overlay;
907 mkdir_p(path);
908
909 if (check_fs)
910 check_filesystem(pr);
911
912 err = mount(pr->dev, path, pr->id->name, 0, (m->options) ? (m->options) : (""));
913
914 if (err) {
915 ERROR("mounting %s (%s) as %s failed (%d) - %s\n",
916 pr->dev, pr->id->name, path, err, strerror(err));
917 } else if (m->overlay) {
918 err = check_extroot(path);
919 if (err)
920 umount(path);
921 }
922 } else {
923 ERROR("extroot: cannot find block device\n");
924 }
925
926 return err;
927 }
928
929 static int main_extroot(int argc, char **argv)
930 {
931 struct blkid_struct_probe *pr;
932 char fs[32] = { 0 };
933 char fs_data[32] = { 0 };
934 int err = -1;
935
936 if (!getenv("PREINIT"))
937 return -1;
938
939 if (argc != 2) {
940 fprintf(stderr, "Usage: block extroot mountpoint\n");
941 return -1;
942 }
943
944 mkblkdev();
945 cache_load(1);
946
947 find_block_mtd("rootfs", fs, sizeof(fs));
948 if (!fs[0]) {
949 ERROR("extroot: unable to locate rootfs mtdblock\n");
950 return -2;
951 }
952
953 pr = find_block_info(NULL, NULL, fs);
954 if (!pr) {
955 ERROR("extroot: unable to retrieve rootfs information\n");
956 return -3;
957 }
958
959 find_block_mtd("rootfs_data", fs_data, sizeof(fs_data));
960 if (fs_data[0]) {
961 pr = find_block_info(NULL, NULL, fs_data);
962 if (pr && !strcmp(pr->id->name, "jffs2")) {
963 char cfg[] = "/tmp/jffs_cfg";
964
965 mkdir_p(cfg);
966 if (!mount(fs_data, cfg, "jffs2", MS_NOATIME, NULL)) {
967 err = mount_extroot(cfg);
968 umount2(cfg, MNT_DETACH);
969 }
970 if (err < 0)
971 rmdir("/tmp/overlay");
972 rmdir(cfg);
973 return err;
974 }
975 }
976
977 return mount_extroot(NULL);
978 }
979
980 static int main_mount(int argc, char **argv)
981 {
982 struct blkid_struct_probe *pr;
983
984 if (config_load(NULL))
985 return -1;
986
987 cache_load(1);
988 list_for_each_entry(pr, &devices, list)
989 mount_device(pr, 0);
990
991 handle_swapfiles(true);
992
993 return 0;
994 }
995
996 static int main_umount(int argc, char **argv)
997 {
998 struct blkid_struct_probe *pr;
999
1000 if (config_load(NULL))
1001 return -1;
1002
1003 handle_swapfiles(false);
1004
1005 cache_load(0);
1006 list_for_each_entry(pr, &devices, list)
1007 umount_device(pr);
1008
1009 return 0;
1010 }
1011
1012 static int main_detect(int argc, char **argv)
1013 {
1014 struct blkid_struct_probe *pr;
1015
1016 cache_load(0);
1017 printf("config 'global'\n");
1018 printf("\toption\tanon_swap\t'0'\n");
1019 printf("\toption\tanon_mount\t'0'\n");
1020 printf("\toption\tauto_swap\t'1'\n");
1021 printf("\toption\tauto_mount\t'1'\n");
1022 printf("\toption\tdelay_root\t'5'\n");
1023 printf("\toption\tcheck_fs\t'0'\n\n");
1024 list_for_each_entry(pr, &devices, list)
1025 print_block_uci(pr);
1026
1027 return 0;
1028 }
1029
1030 static int main_info(int argc, char **argv)
1031 {
1032 int i;
1033 struct blkid_struct_probe *pr;
1034
1035 cache_load(1);
1036 if (argc == 2) {
1037 list_for_each_entry(pr, &devices, list)
1038 print_block_info(pr);
1039
1040 return 0;
1041 };
1042
1043 for (i = 2; i < argc; i++) {
1044 struct stat s;
1045
1046 if (stat(argv[i], &s)) {
1047 ERROR("failed to stat %s\n", argv[i]);
1048 continue;
1049 }
1050 if (!S_ISBLK(s.st_mode)) {
1051 ERROR("%s is not a block device\n", argv[i]);
1052 continue;
1053 }
1054 pr = find_block_info(NULL, NULL, argv[i]);
1055 if (pr)
1056 print_block_info(pr);
1057 }
1058
1059 return 0;
1060 }
1061
1062 static int swapon_usage(void)
1063 {
1064 fprintf(stderr, "Usage: swapon [-s] [-a] [[-p pri] DEVICE]\n\n"
1065 "\tStart swapping on [DEVICE]\n"
1066 " -a\tStart swapping on all swap devices\n"
1067 " -p pri\tSet priority of swap device\n"
1068 " -s\tShow summary\n");
1069 return -1;
1070 }
1071
1072 static int main_swapon(int argc, char **argv)
1073 {
1074 int ch;
1075 FILE *fp;
1076 char *lineptr;
1077 size_t s;
1078 struct blkid_struct_probe *pr;
1079 int flags = 0;
1080 int pri;
1081 struct stat st;
1082 int err;
1083
1084 while ((ch = getopt(argc, argv, "ap:s")) != -1) {
1085 switch(ch) {
1086 case 's':
1087 fp = fopen("/proc/swaps", "r");
1088 lineptr = NULL;
1089
1090 if (!fp) {
1091 ERROR("failed to open /proc/swaps\n");
1092 return -1;
1093 }
1094 while (getline(&lineptr, &s, fp) > 0)
1095 printf(lineptr);
1096 if (lineptr)
1097 free(lineptr);
1098 fclose(fp);
1099 return 0;
1100 case 'a':
1101 cache_load(0);
1102 list_for_each_entry(pr, &devices, list) {
1103 if (strcmp(pr->id->name, "swap"))
1104 continue;
1105 if (swapon(pr->dev, 0))
1106 ERROR("failed to swapon %s\n", pr->dev);
1107 }
1108 return 0;
1109 case 'p':
1110 pri = atoi(optarg);
1111 if (pri >= 0)
1112 flags = ((pri << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
1113 break;
1114 default:
1115 return swapon_usage();
1116 }
1117
1118 }
1119
1120 if (optind != (argc - 1))
1121 return swapon_usage();
1122
1123 if (stat(argv[optind], &st) || (!S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))) {
1124 ERROR("%s is not a block device or file\n", argv[optind]);
1125 return -1;
1126 }
1127 err = swapon(argv[optind], flags);
1128 if (err) {
1129 ERROR("failed to swapon %s (%d)\n", argv[optind], err);
1130 return err;
1131 }
1132
1133 return 0;
1134 }
1135
1136 static int main_swapoff(int argc, char **argv)
1137 {
1138 if (argc != 2) {
1139 ERROR("Usage: swapoff [-a] [DEVICE]\n\n"
1140 "\tStop swapping on DEVICE\n"
1141 " -a\tStop swapping on all swap devices\n");
1142 return -1;
1143 }
1144
1145 if (!strcmp(argv[1], "-a")) {
1146 FILE *fp = fopen("/proc/swaps", "r");
1147 char line[256];
1148
1149 if (!fp) {
1150 ERROR("failed to open /proc/swaps\n");
1151 return -1;
1152 }
1153 fgets(line, sizeof(line), fp);
1154 while (fgets(line, sizeof(line), fp)) {
1155 char *end = strchr(line, ' ');
1156 int err;
1157
1158 if (!end)
1159 continue;
1160 *end = '\0';
1161 err = swapoff(line);
1162 if (err)
1163 ERROR("failed to swapoff %s (%d)\n", line, err);
1164 }
1165 fclose(fp);
1166 } else {
1167 struct stat s;
1168 int err;
1169
1170 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1171 ERROR("%s is not a block device or file\n", argv[1]);
1172 return -1;
1173 }
1174 err = swapoff(argv[1]);
1175 if (err) {
1176 ERROR("fsiled to swapoff %s (%d)\n", argv[1], err);
1177 return err;
1178 }
1179 }
1180
1181 return 0;
1182 }
1183
1184 int main(int argc, char **argv)
1185 {
1186 char *base = basename(*argv);
1187
1188 umask(0);
1189
1190 if (!strcmp(base, "swapon"))
1191 return main_swapon(argc, argv);
1192
1193 if (!strcmp(base, "swapoff"))
1194 return main_swapoff(argc, argv);
1195
1196 if ((argc > 1) && !strcmp(base, "block")) {
1197 if (!strcmp(argv[1], "info"))
1198 return main_info(argc, argv);
1199
1200 if (!strcmp(argv[1], "detect"))
1201 return main_detect(argc, argv);
1202
1203 if (!strcmp(argv[1], "hotplug"))
1204 return main_hotplug(argc, argv);
1205
1206 if (!strcmp(argv[1], "extroot"))
1207 return main_extroot(argc, argv);
1208
1209 if (!strcmp(argv[1], "mount"))
1210 return main_mount(argc, argv);
1211
1212 if (!strcmp(argv[1], "umount"))
1213 return main_umount(argc, argv);
1214 }
1215
1216 fprintf(stderr, "Usage: block <info|mount|umount|detect>\n");
1217
1218 return -1;
1219 }