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