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58487a1a1935e0fe65f2c62e18e73b901feff294
[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
731 if (!pr)
732 return -1;
733
734 device = basename(pr->dev);
735
736 if (!strcmp(pr->id->name, "swap")) {
737 if (hotplug && !auto_swap)
738 return -1;
739 m = find_swap(pr->uuid, pr->label, device);
740 if (m || anon_swap)
741 swapon(pr->dev, (m) ? (m->prio) : (0));
742
743 return 0;
744 }
745
746 if (hotplug && !auto_mount)
747 return -1;
748
749 if (find_mount_point(pr->dev)) {
750 ULOG_ERR("%s is already mounted\n", pr->dev);
751 return -1;
752 }
753
754 m = find_block(pr->uuid, pr->label, device, NULL);
755 if (m && m->extroot)
756 return -1;
757
758 if (m) {
759 char *target = m->target;
760 char _target[32];
761 int err = 0;
762
763 if (!target) {
764 snprintf(_target, sizeof(_target), "/mnt/%s", device);
765 target = _target;
766 }
767 mkdir_p(target);
768
769 if (check_fs)
770 check_filesystem(pr);
771
772 err = mount(pr->dev, target, pr->id->name, m->flags,
773 (m->options) ? (m->options) : (""));
774 if (err)
775 ULOG_ERR("mounting %s (%s) as %s failed (%d) - %s\n",
776 pr->dev, pr->id->name, target, err, strerror(err));
777 else
778 handle_swapfiles(true);
779 return err;
780 }
781
782 if (anon_mount) {
783 char target[32];
784 int err = 0;
785
786 snprintf(target, sizeof(target), "/mnt/%s", device);
787 mkdir_p(target);
788
789 if (check_fs)
790 check_filesystem(pr);
791
792 err = mount(pr->dev, target, pr->id->name, 0, "");
793 if (err)
794 ULOG_ERR("mounting %s (%s) as %s failed (%d) - %s\n",
795 pr->dev, pr->id->name, target, err, strerror(err));
796 else
797 handle_swapfiles(true);
798 return err;
799 }
800
801 return 0;
802 }
803
804 static int umount_device(struct blkid_struct_probe *pr)
805 {
806 struct mount *m;
807 char *device = basename(pr->dev);
808 char *mp;
809 int err;
810
811 if (!pr)
812 return -1;
813
814 if (!strcmp(pr->id->name, "swap"))
815 return -1;
816
817 mp = find_mount_point(pr->dev);
818 if (!mp)
819 return -1;
820
821 m = find_block(pr->uuid, pr->label, device, NULL);
822 if (m && m->extroot)
823 return -1;
824
825 err = umount2(mp, MNT_DETACH);
826 if (err)
827 ULOG_ERR("unmounting %s (%s) failed (%d) - %s\n",
828 pr->dev, mp, err, strerror(err));
829 else
830 ULOG_INFO("unmounted %s (%s)\n",
831 pr->dev, mp);
832
833 return err;
834 }
835
836 static int main_hotplug(int argc, char **argv)
837 {
838 char path[32];
839 char *action, *device, *mount_point;
840
841 action = getenv("ACTION");
842 device = getenv("DEVNAME");
843
844 if (!action || !device)
845 return -1;
846 snprintf(path, sizeof(path), "/dev/%s", device);
847
848 if (!strcmp(action, "remove")) {
849 int err = 0;
850 mount_point = find_mount_point(path);
851 if (mount_point)
852 err = umount2(mount_point, MNT_DETACH);
853
854 if (err)
855 ULOG_ERR("umount of %s failed (%d) - %s\n",
856 mount_point, err, strerror(err));
857
858 return 0;
859 } else if (strcmp(action, "add")) {
860 ULOG_ERR("Unkown action %s\n", action);
861
862 return -1;
863 }
864
865 if (config_load(NULL))
866 return -1;
867 cache_load(0);
868
869 return mount_device(find_block_info(NULL, NULL, path), 1);
870 }
871
872 static int find_block_mtd(char *name, char *part, int plen)
873 {
874 FILE *fp = fopen("/proc/mtd", "r");
875 static char line[256];
876 char *index = NULL;
877
878 if(!fp)
879 return -1;
880
881 while (!index && fgets(line, sizeof(line), fp)) {
882 if (strstr(line, name)) {
883 char *eol = strstr(line, ":");
884
885 if (!eol)
886 continue;
887
888 *eol = '\0';
889 index = &line[3];
890 }
891 }
892
893 fclose(fp);
894
895 if (!index)
896 return -1;
897
898 snprintf(part, plen, "/dev/mtdblock%s", index);
899
900 return 0;
901 }
902
903 #ifdef UBIFS_EXTROOT
904 static int find_ubi_vol(libubi_t libubi, char *name, int *dev_num, int *vol_id)
905 {
906 int dev = 0;
907
908 while (ubi_dev_present(libubi, dev))
909 {
910 struct ubi_dev_info dev_info;
911 struct ubi_vol_info vol_info;
912
913 if (ubi_get_dev_info1(libubi, dev++, &dev_info))
914 continue;
915 if (ubi_get_vol_info1_nm(libubi, dev_info.dev_num, name, &vol_info))
916 continue;
917
918 *dev_num = dev_info.dev_num;
919 *vol_id = vol_info.vol_id;
920
921 return 0;
922 }
923
924 return -1;
925 }
926
927 static int find_block_ubi(libubi_t libubi, char *name, char *part, int plen)
928 {
929 int dev_num;
930 int vol_id;
931 int err = -1;
932
933 err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
934 if (!err)
935 snprintf(part, plen, "/dev/ubi%d_%d", dev_num, vol_id);
936
937 return err;
938 }
939
940 static int find_block_ubi_RO(libubi_t libubi, char *name, char *part, int plen)
941 {
942 int dev_num;
943 int vol_id;
944 int err = -1;
945
946 err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
947 if (!err)
948 snprintf(part, plen, "/dev/ubiblock%d_%d", dev_num, vol_id);
949
950 return err;
951 }
952
953 #else
954
955 static int find_root_dev(char *buf, int len)
956 {
957 DIR *d;
958 dev_t root;
959 struct stat s;
960 struct dirent *e;
961
962 if (stat("/", &s))
963 return -1;
964
965 if (!(d = opendir("/dev")))
966 return -1;
967
968 root = s.st_dev;
969
970 while ((e = readdir(d)) != NULL) {
971 snprintf(buf, len, "/dev/%s", e->d_name);
972
973 if (stat(buf, &s) || s.st_rdev != root)
974 continue;
975
976 closedir(d);
977 return 0;
978 }
979
980 closedir(d);
981 return -1;
982 }
983
984 #endif
985
986 static int test_fs_support(const char *name)
987 {
988 char line[128], *p;
989 int rv = -1;
990 FILE *f;
991
992 if ((f = fopen("/proc/filesystems", "r")) != NULL) {
993 while (fgets(line, sizeof(line), f)) {
994 p = strtok(line, "\t\n");
995
996 if (p && !strcmp(p, "nodev"))
997 p = strtok(NULL, "\t\n");
998
999 if (p && !strcmp(p, name)) {
1000 rv = 0;
1001 break;
1002 }
1003 }
1004 fclose(f);
1005 }
1006
1007 return rv;
1008 }
1009
1010 static int check_extroot(char *path)
1011 {
1012 struct blkid_struct_probe *pr = NULL;
1013 char devpath[32];
1014
1015 #ifdef UBIFS_EXTROOT
1016 if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) {
1017 int err = -1;
1018 libubi_t libubi;
1019
1020 libubi = libubi_open();
1021 err = find_block_ubi_RO(libubi, "rootfs", devpath, sizeof(devpath));
1022 libubi_close(libubi);
1023 if (err)
1024 return -1;
1025 }
1026 #else
1027 if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) {
1028 if (find_root_dev(devpath, sizeof(devpath))) {
1029 ULOG_ERR("extroot: unable to determine root device\n");
1030 return -1;
1031 }
1032 }
1033 #endif
1034
1035 list_for_each_entry(pr, &devices, list) {
1036 if (!strcmp(pr->dev, devpath)) {
1037 struct stat s;
1038 FILE *fp = NULL;
1039 char tag[64];
1040 char uuid[64] = { 0 };
1041
1042 snprintf(tag, sizeof(tag), "%s/etc", path);
1043 if (stat(tag, &s))
1044 mkdir_p(tag);
1045
1046 snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
1047 if (stat(tag, &s)) {
1048 fp = fopen(tag, "w+");
1049 if (!fp) {
1050 ULOG_ERR("extroot: failed to write UUID to %s: %d (%s)\n",
1051 tag, errno, strerror(errno));
1052 /* return 0 to continue boot regardless of error */
1053 return 0;
1054 }
1055 fputs(pr->uuid, fp);
1056 fclose(fp);
1057 return 0;
1058 }
1059
1060 fp = fopen(tag, "r");
1061 if (!fp) {
1062 ULOG_ERR("extroot: failed to read UUID from %s: %d (%s)\n",
1063 tag, errno, strerror(errno));
1064 return -1;
1065 }
1066
1067 if (!fgets(uuid, sizeof(uuid), fp))
1068 ULOG_ERR("extroot: failed to read UUID from %s: %d (%s)\n",
1069 tag, errno, strerror(errno));
1070 fclose(fp);
1071
1072 if (*uuid || !strcasecmp(uuid, pr->uuid))
1073 return 0;
1074
1075 ULOG_ERR("extroot: UUID mismatch (root: %s, %s: %s)\n",
1076 pr->uuid, basename(path), uuid);
1077 return -1;
1078 }
1079 }
1080
1081 ULOG_ERR("extroot: unable to lookup root device %s\n", devpath);
1082 return -1;
1083 }
1084
1085 /*
1086 * Read info about extroot from UCI (using prefix) and mount it.
1087 */
1088 static int mount_extroot(char *cfg)
1089 {
1090 char overlay[] = "/tmp/extroot/overlay";
1091 char mnt[] = "/tmp/extroot/mnt";
1092 char *path = mnt;
1093 struct blkid_struct_probe *pr;
1094 struct mount *m;
1095 int err = -1;
1096
1097 /* Load @cfg/etc/config/fstab */
1098 if (config_load(cfg))
1099 return -2;
1100
1101 /* See if there is extroot-specific mount config */
1102 m = find_block(NULL, NULL, NULL, "/");
1103 if (!m)
1104 m = find_block(NULL, NULL, NULL, "/overlay");
1105
1106 if (!m || !m->extroot)
1107 {
1108 ULOG_INFO("extroot: not configured\n");
1109 return -1;
1110 }
1111
1112 /* Find block device pointed by the mount config */
1113 pr = find_block_info(m->uuid, m->label, m->device);
1114
1115 if (!pr && delay_root){
1116 ULOG_INFO("extroot: device not present, retrying in %u seconds\n", delay_root);
1117 sleep(delay_root);
1118 mkblkdev();
1119 cache_load(0);
1120 pr = find_block_info(m->uuid, m->label, m->device);
1121 }
1122 if (pr) {
1123 if (strncmp(pr->id->name, "ext", 3) &&
1124 strncmp(pr->id->name, "ubifs", 5)) {
1125 ULOG_ERR("extroot: unsupported filesystem %s, try ext4\n", pr->id->name);
1126 return -1;
1127 }
1128
1129 if (test_fs_support(pr->id->name)) {
1130 ULOG_ERR("extroot: filesystem %s not supported by kernel\n", pr->id->name);
1131 return -1;
1132 }
1133
1134 if (m->overlay)
1135 path = overlay;
1136 mkdir_p(path);
1137
1138 if (check_fs)
1139 check_filesystem(pr);
1140
1141 err = mount(pr->dev, path, pr->id->name, m->flags,
1142 (m->options) ? (m->options) : (""));
1143
1144 if (err) {
1145 ULOG_ERR("extroot: mounting %s (%s) on %s failed: %d (%s)\n",
1146 pr->dev, pr->id->name, path, err, strerror(err));
1147 } else if (m->overlay) {
1148 err = check_extroot(path);
1149 if (err)
1150 umount(path);
1151 }
1152 } else {
1153 ULOG_ERR("extroot: cannot find device %s%s\n",
1154 (m->uuid ? "with UUID " : (m->label ? "with label " : "")),
1155 (m->uuid ? m->uuid : (m->label ? m->label : m->device)));
1156 }
1157
1158 return err;
1159 }
1160
1161 static int main_extroot(int argc, char **argv)
1162 {
1163 struct blkid_struct_probe *pr;
1164 char blkdev_path[32] = { 0 };
1165 int err = -1;
1166 #ifdef UBIFS_EXTROOT
1167 libubi_t libubi;
1168 #endif
1169
1170 if (!getenv("PREINIT"))
1171 return -1;
1172
1173 if (argc != 2) {
1174 ULOG_ERR("Usage: block extroot\n");
1175 return -1;
1176 }
1177
1178 mkblkdev();
1179 cache_load(1);
1180
1181 /* enable LOG_INFO messages */
1182 ulog_threshold(LOG_INFO);
1183
1184 /*
1185 * Look for "rootfs_data". We will want to mount it and check for
1186 * extroot configuration.
1187 */
1188
1189 /* Start with looking for MTD partition */
1190 find_block_mtd("\"rootfs_data\"", blkdev_path, sizeof(blkdev_path));
1191 if (blkdev_path[0]) {
1192 pr = find_block_info(NULL, NULL, blkdev_path);
1193 if (pr && !strcmp(pr->id->name, "jffs2")) {
1194 char cfg[] = "/tmp/jffs_cfg";
1195
1196 /*
1197 * Mount MTD part and try extroot (using
1198 * /etc/config/fstab from that partition)
1199 */
1200 mkdir_p(cfg);
1201 if (!mount(blkdev_path, cfg, "jffs2", MS_NOATIME, NULL)) {
1202 err = mount_extroot(cfg);
1203 umount2(cfg, MNT_DETACH);
1204 }
1205 if (err < 0)
1206 rmdir("/tmp/overlay");
1207 rmdir(cfg);
1208 return err;
1209 }
1210 }
1211
1212 #ifdef UBIFS_EXTROOT
1213 /* ... but it also could be an UBI volume */
1214 memset(blkdev_path, 0, sizeof(blkdev_path));
1215 libubi = libubi_open();
1216 find_block_ubi(libubi, "rootfs_data", blkdev_path, sizeof(blkdev_path));
1217 libubi_close(libubi);
1218 if (blkdev_path[0]) {
1219 char cfg[] = "/tmp/ubifs_cfg";
1220
1221 /* Mount volume and try extroot (using fstab from that vol) */
1222 mkdir_p(cfg);
1223 if (!mount(blkdev_path, cfg, "ubifs", MS_NOATIME, NULL)) {
1224 err = mount_extroot(cfg);
1225 umount2(cfg, MNT_DETACH);
1226 }
1227 if (err < 0)
1228 rmdir("/tmp/overlay");
1229 rmdir(cfg);
1230 return err;
1231 }
1232 #endif
1233
1234 return mount_extroot(NULL);
1235 }
1236
1237 static int main_mount(int argc, char **argv)
1238 {
1239 struct blkid_struct_probe *pr;
1240
1241 if (config_load(NULL))
1242 return -1;
1243
1244 cache_load(1);
1245 list_for_each_entry(pr, &devices, list)
1246 mount_device(pr, 0);
1247
1248 handle_swapfiles(true);
1249
1250 return 0;
1251 }
1252
1253 static int main_umount(int argc, char **argv)
1254 {
1255 struct blkid_struct_probe *pr;
1256
1257 if (config_load(NULL))
1258 return -1;
1259
1260 handle_swapfiles(false);
1261
1262 cache_load(0);
1263 list_for_each_entry(pr, &devices, list)
1264 umount_device(pr);
1265
1266 return 0;
1267 }
1268
1269 static int main_detect(int argc, char **argv)
1270 {
1271 struct blkid_struct_probe *pr;
1272
1273 cache_load(0);
1274 printf("config 'global'\n");
1275 printf("\toption\tanon_swap\t'0'\n");
1276 printf("\toption\tanon_mount\t'0'\n");
1277 printf("\toption\tauto_swap\t'1'\n");
1278 printf("\toption\tauto_mount\t'1'\n");
1279 printf("\toption\tdelay_root\t'5'\n");
1280 printf("\toption\tcheck_fs\t'0'\n\n");
1281 list_for_each_entry(pr, &devices, list)
1282 print_block_uci(pr);
1283
1284 return 0;
1285 }
1286
1287 static int main_info(int argc, char **argv)
1288 {
1289 int i;
1290 struct blkid_struct_probe *pr;
1291
1292 cache_load(1);
1293 if (argc == 2) {
1294 list_for_each_entry(pr, &devices, list)
1295 print_block_info(pr);
1296
1297 return 0;
1298 };
1299
1300 for (i = 2; i < argc; i++) {
1301 struct stat s;
1302
1303 if (stat(argv[i], &s)) {
1304 ULOG_ERR("failed to stat %s\n", argv[i]);
1305 continue;
1306 }
1307 if (!S_ISBLK(s.st_mode) && !(S_ISCHR(s.st_mode) && major(s.st_rdev) == 250)) {
1308 ULOG_ERR("%s is not a block device\n", argv[i]);
1309 continue;
1310 }
1311 pr = find_block_info(NULL, NULL, argv[i]);
1312 if (pr)
1313 print_block_info(pr);
1314 }
1315
1316 return 0;
1317 }
1318
1319 static int swapon_usage(void)
1320 {
1321 fprintf(stderr, "Usage: swapon [-s] [-a] [[-p pri] DEVICE]\n\n"
1322 "\tStart swapping on [DEVICE]\n"
1323 " -a\tStart swapping on all swap devices\n"
1324 " -p pri\tSet priority of swap device\n"
1325 " -s\tShow summary\n");
1326 return -1;
1327 }
1328
1329 static int main_swapon(int argc, char **argv)
1330 {
1331 int ch;
1332 FILE *fp;
1333 char *lineptr;
1334 size_t s;
1335 struct blkid_struct_probe *pr;
1336 int flags = 0;
1337 int pri;
1338 struct stat st;
1339 int err;
1340
1341 while ((ch = getopt(argc, argv, "ap:s")) != -1) {
1342 switch(ch) {
1343 case 's':
1344 fp = fopen("/proc/swaps", "r");
1345 lineptr = NULL;
1346
1347 if (!fp) {
1348 ULOG_ERR("failed to open /proc/swaps\n");
1349 return -1;
1350 }
1351 while (getline(&lineptr, &s, fp) > 0)
1352 printf("%s", lineptr);
1353 if (lineptr)
1354 free(lineptr);
1355 fclose(fp);
1356 return 0;
1357 case 'a':
1358 cache_load(0);
1359 list_for_each_entry(pr, &devices, list) {
1360 if (strcmp(pr->id->name, "swap"))
1361 continue;
1362 if (swapon(pr->dev, 0))
1363 ULOG_ERR("failed to swapon %s\n", pr->dev);
1364 }
1365 return 0;
1366 case 'p':
1367 pri = atoi(optarg);
1368 if (pri >= 0)
1369 flags = ((pri << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
1370 break;
1371 default:
1372 return swapon_usage();
1373 }
1374
1375 }
1376
1377 if (optind != (argc - 1))
1378 return swapon_usage();
1379
1380 if (stat(argv[optind], &st) || (!S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))) {
1381 ULOG_ERR("%s is not a block device or file\n", argv[optind]);
1382 return -1;
1383 }
1384 err = swapon(argv[optind], flags);
1385 if (err) {
1386 ULOG_ERR("failed to swapon %s (%d)\n", argv[optind], err);
1387 return err;
1388 }
1389
1390 return 0;
1391 }
1392
1393 static int main_swapoff(int argc, char **argv)
1394 {
1395 if (argc != 2) {
1396 ULOG_ERR("Usage: swapoff [-a] [DEVICE]\n\n"
1397 "\tStop swapping on DEVICE\n"
1398 " -a\tStop swapping on all swap devices\n");
1399 return -1;
1400 }
1401
1402 if (!strcmp(argv[1], "-a")) {
1403 FILE *fp = fopen("/proc/swaps", "r");
1404 char line[256];
1405
1406 if (!fp) {
1407 ULOG_ERR("failed to open /proc/swaps\n");
1408 return -1;
1409 }
1410 if (fgets(line, sizeof(line), fp))
1411 while (fgets(line, sizeof(line), fp)) {
1412 char *end = strchr(line, ' ');
1413 int err;
1414
1415 if (!end)
1416 continue;
1417 *end = '\0';
1418 err = swapoff(line);
1419 if (err)
1420 ULOG_ERR("failed to swapoff %s (%d)\n", line, err);
1421 }
1422 fclose(fp);
1423 } else {
1424 struct stat s;
1425 int err;
1426
1427 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1428 ULOG_ERR("%s is not a block device or file\n", argv[1]);
1429 return -1;
1430 }
1431 err = swapoff(argv[1]);
1432 if (err) {
1433 ULOG_ERR("failed to swapoff %s (%d)\n", argv[1], err);
1434 return err;
1435 }
1436 }
1437
1438 return 0;
1439 }
1440
1441 int main(int argc, char **argv)
1442 {
1443 char *base = basename(*argv);
1444
1445 umask(0);
1446
1447 ulog_open(-1, -1, "block");
1448 ulog_threshold(LOG_NOTICE);
1449
1450 if (!strcmp(base, "swapon"))
1451 return main_swapon(argc, argv);
1452
1453 if (!strcmp(base, "swapoff"))
1454 return main_swapoff(argc, argv);
1455
1456 if ((argc > 1) && !strcmp(base, "block")) {
1457 if (!strcmp(argv[1], "info"))
1458 return main_info(argc, argv);
1459
1460 if (!strcmp(argv[1], "detect"))
1461 return main_detect(argc, argv);
1462
1463 if (!strcmp(argv[1], "hotplug"))
1464 return main_hotplug(argc, argv);
1465
1466 if (!strcmp(argv[1], "extroot"))
1467 return main_extroot(argc, argv);
1468
1469 if (!strcmp(argv[1], "mount"))
1470 return main_mount(argc, argv);
1471
1472 if (!strcmp(argv[1], "umount"))
1473 return main_umount(argc, argv);
1474
1475 if (!strcmp(argv[1], "remount")) {
1476 int ret = main_umount(argc, argv);
1477
1478 if (!ret)
1479 ret = main_mount(argc, argv);
1480 return ret;
1481 }
1482 }
1483
1484 ULOG_ERR("Usage: block <info|mount|umount|detect>\n");
1485
1486 return -1;
1487 }
OpenWrt filesystem utilities