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6c025fdce4963eb6169a37517637d9ee6873dde4
[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];
592 int len = strlen(block);
593 char *point = NULL;
594
595 if(!fp)
596 return NULL;
597
598 while (fgets(line, sizeof(line), fp)) {
599 if (!strncmp(line, block, len)) {
600 char *p = &line[len + 1];
601 char *t = strstr(p, " ");
602
603 if (!t) {
604 fclose(fp);
605 return NULL;
606 }
607 *t = '\0';
608 point = p;
609 break;
610 }
611 }
612
613 fclose(fp);
614
615 return point;
616 }
617
618 static void mkdir_p(char *dir)
619 {
620 char *l = strrchr(dir, '/');
621
622 if (l) {
623 *l = '\0';
624 mkdir_p(dir);
625 *l = '/';
626 mkdir(dir, 0755);
627 }
628 }
629
630 static void check_filesystem(struct blkid_struct_probe *pr)
631 {
632 pid_t pid;
633 struct stat statbuf;
634 const char *e2fsck = "/usr/sbin/e2fsck";
635 const char *dosfsck = "/usr/sbin/dosfsck";
636 const char *ckfs;
637
638 /* UBIFS does not need stuff like fsck */
639 if (!strncmp(pr->id->name, "ubifs", 5))
640 return;
641
642 if (!strncmp(pr->id->name, "vfat", 4)) {
643 ckfs = dosfsck;
644 } else if (!strncmp(pr->id->name, "ext", 3)) {
645 ckfs = e2fsck;
646 } else {
647 ULOG_ERR("check_filesystem: %s is not supported\n", pr->id->name);
648 return;
649 }
650
651 if (stat(ckfs, &statbuf) < 0) {
652 ULOG_ERR("check_filesystem: %s not found\n", ckfs);
653 return;
654 }
655
656 pid = fork();
657 if (!pid) {
658 execl(ckfs, ckfs, "-p", pr->dev, NULL);
659 exit(-1);
660 } else if (pid > 0) {
661 int status;
662
663 waitpid(pid, &status, 0);
664 if (WEXITSTATUS(status))
665 ULOG_ERR("check_filesystem: %s returned %d\n", ckfs, WEXITSTATUS(status));
666 }
667 }
668
669 static void handle_swapfiles(bool on)
670 {
671 struct stat s;
672 struct mount *m;
673 struct blkid_struct_probe *pr;
674
675 vlist_for_each_element(&mounts, m, node)
676 {
677 if (m->type != TYPE_SWAP || !m->target)
678 continue;
679
680 if (stat(m->target, &s) || !S_ISREG(s.st_mode))
681 continue;
682
683 pr = _probe_path(m->target);
684
685 if (!pr)
686 continue;
687
688 if (!strcmp(pr->id->name, "swap")) {
689 if (on)
690 swapon(pr->dev, m->prio);
691 else
692 swapoff(pr->dev);
693 }
694
695 free(pr);
696 }
697 }
698
699 static int mount_device(struct blkid_struct_probe *pr, int hotplug)
700 {
701 struct mount *m;
702 char *device;
703
704 if (!pr)
705 return -1;
706
707 device = basename(pr->dev);
708
709 if (!strcmp(pr->id->name, "swap")) {
710 if (hotplug && !auto_swap)
711 return -1;
712 m = find_swap(pr->uuid, pr->label, device);
713 if (m || anon_swap)
714 swapon(pr->dev, (m) ? (m->prio) : (0));
715
716 return 0;
717 }
718
719 if (hotplug && !auto_mount)
720 return -1;
721
722 if (find_mount_point(pr->dev)) {
723 ULOG_ERR("%s is already mounted\n", pr->dev);
724 return -1;
725 }
726
727 m = find_block(pr->uuid, pr->label, device, NULL);
728 if (m && m->extroot)
729 return -1;
730
731 if (m) {
732 char *target = m->target;
733 char _target[32];
734 int err = 0;
735
736 if (!target) {
737 snprintf(_target, sizeof(_target), "/mnt/%s", device);
738 target = _target;
739 }
740 mkdir_p(target);
741
742 if (check_fs)
743 check_filesystem(pr);
744
745 err = mount(pr->dev, target, pr->id->name, m->flags,
746 (m->options) ? (m->options) : (""));
747 if (err)
748 ULOG_ERR("mounting %s (%s) as %s failed (%d) - %s\n",
749 pr->dev, pr->id->name, target, err, strerror(err));
750 else
751 handle_swapfiles(true);
752 return err;
753 }
754
755 if (anon_mount) {
756 char target[] = "/mnt/mmcblk123";
757 int err = 0;
758
759 snprintf(target, sizeof(target), "/mnt/%s", device);
760 mkdir_p(target);
761
762 if (check_fs)
763 check_filesystem(pr);
764
765 err = mount(pr->dev, target, pr->id->name, 0, "");
766 if (err)
767 ULOG_ERR("mounting %s (%s) as %s failed (%d) - %s\n",
768 pr->dev, pr->id->name, target, err, strerror(err));
769 else
770 handle_swapfiles(true);
771 return err;
772 }
773
774 return 0;
775 }
776
777 static int umount_device(struct blkid_struct_probe *pr)
778 {
779 struct mount *m;
780 char *device = basename(pr->dev);
781 char *mp;
782 int err;
783
784 if (!pr)
785 return -1;
786
787 if (!strcmp(pr->id->name, "swap"))
788 return -1;
789
790 mp = find_mount_point(pr->dev);
791 if (!mp)
792 return -1;
793
794 m = find_block(pr->uuid, pr->label, device, NULL);
795 if (m && m->extroot)
796 return -1;
797
798 err = umount2(mp, MNT_DETACH);
799 if (err)
800 ULOG_ERR("unmounting %s (%s) failed (%d) - %s\n",
801 pr->dev, mp, err, strerror(err));
802 else
803 ULOG_INFO("unmounted %s (%s)\n",
804 pr->dev, mp);
805
806 return err;
807 }
808
809 static int main_hotplug(int argc, char **argv)
810 {
811 char path[32];
812 char *action, *device, *mount_point;
813
814 action = getenv("ACTION");
815 device = getenv("DEVNAME");
816
817 if (!action || !device)
818 return -1;
819 snprintf(path, sizeof(path), "/dev/%s", device);
820
821 if (!strcmp(action, "remove")) {
822 int err = 0;
823 mount_point = find_mount_point(path);
824 if (mount_point)
825 err = umount2(mount_point, MNT_DETACH);
826
827 if (err)
828 ULOG_ERR("umount of %s failed (%d) - %s\n",
829 mount_point, err, strerror(err));
830
831 return 0;
832 } else if (strcmp(action, "add")) {
833 ULOG_ERR("Unkown action %s\n", action);
834
835 return -1;
836 }
837
838 if (config_load(NULL))
839 return -1;
840 cache_load(0);
841
842 return mount_device(find_block_info(NULL, NULL, path), 1);
843 }
844
845 static int find_block_mtd(char *name, char *part, int plen)
846 {
847 FILE *fp = fopen("/proc/mtd", "r");
848 static char line[256];
849 char *index = NULL;
850
851 if(!fp)
852 return -1;
853
854 while (!index && fgets(line, sizeof(line), fp)) {
855 if (strstr(line, name)) {
856 char *eol = strstr(line, ":");
857
858 if (!eol)
859 continue;
860
861 *eol = '\0';
862 index = &line[3];
863 }
864 }
865
866 fclose(fp);
867
868 if (!index)
869 return -1;
870
871 snprintf(part, plen, "/dev/mtdblock%s", index);
872
873 return 0;
874 }
875
876 #ifdef UBIFS_EXTROOT
877 static int find_ubi_vol(libubi_t libubi, char *name, int *dev_num, int *vol_id)
878 {
879 int dev = 0;
880
881 while (ubi_dev_present(libubi, dev))
882 {
883 struct ubi_dev_info dev_info;
884 struct ubi_vol_info vol_info;
885
886 if (ubi_get_dev_info1(libubi, dev++, &dev_info))
887 continue;
888 if (ubi_get_vol_info1_nm(libubi, dev_info.dev_num, name, &vol_info))
889 continue;
890
891 *dev_num = dev_info.dev_num;
892 *vol_id = vol_info.vol_id;
893
894 return 0;
895 }
896
897 return -1;
898 }
899
900 static int find_block_ubi(libubi_t libubi, char *name, char *part, int plen)
901 {
902 int dev_num;
903 int vol_id;
904 int err = -1;
905
906 err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
907 if (!err)
908 snprintf(part, plen, "/dev/ubi%d_%d", dev_num, vol_id);
909
910 return err;
911 }
912
913 static int find_block_ubi_RO(libubi_t libubi, char *name, char *part, int plen)
914 {
915 int dev_num;
916 int vol_id;
917 int err = -1;
918
919 err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
920 if (!err)
921 snprintf(part, plen, "/dev/ubiblock%d_%d", dev_num, vol_id);
922
923 return err;
924 }
925
926 #else
927
928 static int find_root_dev(char *buf, int len)
929 {
930 DIR *d;
931 dev_t root;
932 struct stat s;
933 struct dirent *e;
934
935 if (stat("/", &s))
936 return -1;
937
938 if (!(d = opendir("/dev")))
939 return -1;
940
941 root = s.st_dev;
942
943 while ((e = readdir(d)) != NULL) {
944 snprintf(buf, len, "/dev/%s", e->d_name);
945
946 if (stat(buf, &s) || s.st_rdev != root)
947 continue;
948
949 closedir(d);
950 return 0;
951 }
952
953 closedir(d);
954 return -1;
955 }
956
957 #endif
958
959 static int test_fs_support(const char *name)
960 {
961 char line[128], *p;
962 int rv = -1;
963 FILE *f;
964
965 if ((f = fopen("/proc/filesystems", "r")) != NULL) {
966 while (fgets(line, sizeof(line), f)) {
967 p = strtok(line, "\t\n");
968
969 if (p && !strcmp(p, "nodev"))
970 p = strtok(NULL, "\t\n");
971
972 if (p && !strcmp(p, name)) {
973 rv = 0;
974 break;
975 }
976 }
977 fclose(f);
978 }
979
980 return rv;
981 }
982
983 static int check_extroot(char *path)
984 {
985 struct blkid_struct_probe *pr = NULL;
986 char devpath[32];
987
988 #ifdef UBIFS_EXTROOT
989 if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) {
990 int err = -1;
991 libubi_t libubi;
992
993 libubi = libubi_open();
994 err = find_block_ubi_RO(libubi, "rootfs", devpath, sizeof(devpath));
995 libubi_close(libubi);
996 if (err)
997 return -1;
998 }
999 #else
1000 if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) {
1001 if (find_root_dev(devpath, sizeof(devpath))) {
1002 ULOG_ERR("extroot: unable to determine root device\n");
1003 return -1;
1004 }
1005 }
1006 #endif
1007
1008 list_for_each_entry(pr, &devices, list) {
1009 if (!strcmp(pr->dev, devpath)) {
1010 struct stat s;
1011 FILE *fp = NULL;
1012 char tag[64];
1013 char uuid[64] = { 0 };
1014
1015 snprintf(tag, sizeof(tag), "%s/etc", path);
1016 if (stat(tag, &s))
1017 mkdir_p(tag);
1018
1019 snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
1020 if (stat(tag, &s)) {
1021 fp = fopen(tag, "w+");
1022 if (!fp) {
1023 ULOG_ERR("extroot: failed to write UUID to %s: %d (%s)\n",
1024 tag, errno, strerror(errno));
1025 /* return 0 to continue boot regardless of error */
1026 return 0;
1027 }
1028 fputs(pr->uuid, fp);
1029 fclose(fp);
1030 return 0;
1031 }
1032
1033 fp = fopen(tag, "r");
1034 if (!fp) {
1035 ULOG_ERR("extroot: failed to read UUID from %s: %d (%s)\n",
1036 tag, errno, strerror(errno));
1037 return -1;
1038 }
1039
1040 if (!fgets(uuid, sizeof(uuid), fp))
1041 ULOG_ERR("extroot: failed to read UUID from %s: %d (%s)\n",
1042 tag, errno, strerror(errno));
1043 fclose(fp);
1044
1045 if (*uuid || !strcasecmp(uuid, pr->uuid))
1046 return 0;
1047
1048 ULOG_ERR("extroot: UUID mismatch (root: %s, %s: %s)\n",
1049 pr->uuid, basename(path), uuid);
1050 return -1;
1051 }
1052 }
1053
1054 ULOG_ERR("extroot: unable to lookup root device %s\n", devpath);
1055 return -1;
1056 }
1057
1058 /*
1059 * Read info about extroot from UCI (using prefix) and mount it.
1060 */
1061 static int mount_extroot(char *cfg)
1062 {
1063 char overlay[] = "/tmp/extroot/overlay";
1064 char mnt[] = "/tmp/extroot/mnt";
1065 char *path = mnt;
1066 struct blkid_struct_probe *pr;
1067 struct mount *m;
1068 int err = -1;
1069
1070 /* Load @cfg/etc/config/fstab */
1071 if (config_load(cfg))
1072 return -2;
1073
1074 /* See if there is extroot-specific mount config */
1075 m = find_block(NULL, NULL, NULL, "/");
1076 if (!m)
1077 m = find_block(NULL, NULL, NULL, "/overlay");
1078
1079 if (!m || !m->extroot)
1080 {
1081 ULOG_INFO("extroot: not configured\n");
1082 return -1;
1083 }
1084
1085 /* Find block device pointed by the mount config */
1086 pr = find_block_info(m->uuid, m->label, m->device);
1087
1088 if (!pr && delay_root){
1089 ULOG_INFO("extroot: device not present, retrying in %u seconds\n", delay_root);
1090 sleep(delay_root);
1091 mkblkdev();
1092 cache_load(0);
1093 pr = find_block_info(m->uuid, m->label, m->device);
1094 }
1095 if (pr) {
1096 if (strncmp(pr->id->name, "ext", 3) &&
1097 strncmp(pr->id->name, "ubifs", 5)) {
1098 ULOG_ERR("extroot: unsupported filesystem %s, try ext4\n", pr->id->name);
1099 return -1;
1100 }
1101
1102 if (test_fs_support(pr->id->name)) {
1103 ULOG_ERR("extroot: filesystem %s not supported by kernel\n", pr->id->name);
1104 return -1;
1105 }
1106
1107 if (m->overlay)
1108 path = overlay;
1109 mkdir_p(path);
1110
1111 if (check_fs)
1112 check_filesystem(pr);
1113
1114 err = mount(pr->dev, path, pr->id->name, m->flags,
1115 (m->options) ? (m->options) : (""));
1116
1117 if (err) {
1118 ULOG_ERR("extroot: mounting %s (%s) on %s failed: %d (%s)\n",
1119 pr->dev, pr->id->name, path, err, strerror(err));
1120 } else if (m->overlay) {
1121 err = check_extroot(path);
1122 if (err)
1123 umount(path);
1124 }
1125 } else {
1126 ULOG_ERR("extroot: cannot find device %s%s\n",
1127 (m->uuid ? "with UUID " : (m->label ? "with label " : "")),
1128 (m->uuid ? m->uuid : (m->label ? m->label : m->device)));
1129 }
1130
1131 return err;
1132 }
1133
1134 static int main_extroot(int argc, char **argv)
1135 {
1136 struct blkid_struct_probe *pr;
1137 char blkdev_path[32] = { 0 };
1138 int err = -1;
1139 #ifdef UBIFS_EXTROOT
1140 libubi_t libubi;
1141 #endif
1142
1143 if (!getenv("PREINIT"))
1144 return -1;
1145
1146 if (argc != 2) {
1147 ULOG_ERR("Usage: block extroot\n");
1148 return -1;
1149 }
1150
1151 mkblkdev();
1152 cache_load(1);
1153
1154 /* enable LOG_INFO messages */
1155 ulog_threshold(LOG_INFO);
1156
1157 /*
1158 * Look for "rootfs_data". We will want to mount it and check for
1159 * extroot configuration.
1160 */
1161
1162 /* Start with looking for MTD partition */
1163 find_block_mtd("\"rootfs_data\"", blkdev_path, sizeof(blkdev_path));
1164 if (blkdev_path[0]) {
1165 pr = find_block_info(NULL, NULL, blkdev_path);
1166 if (pr && !strcmp(pr->id->name, "jffs2")) {
1167 char cfg[] = "/tmp/jffs_cfg";
1168
1169 /*
1170 * Mount MTD part and try extroot (using
1171 * /etc/config/fstab from that partition)
1172 */
1173 mkdir_p(cfg);
1174 if (!mount(blkdev_path, cfg, "jffs2", MS_NOATIME, NULL)) {
1175 err = mount_extroot(cfg);
1176 umount2(cfg, MNT_DETACH);
1177 }
1178 if (err < 0)
1179 rmdir("/tmp/overlay");
1180 rmdir(cfg);
1181 return err;
1182 }
1183 }
1184
1185 #ifdef UBIFS_EXTROOT
1186 /* ... but it also could be an UBI volume */
1187 memset(blkdev_path, 0, sizeof(blkdev_path));
1188 libubi = libubi_open();
1189 find_block_ubi(libubi, "rootfs_data", blkdev_path, sizeof(blkdev_path));
1190 libubi_close(libubi);
1191 if (blkdev_path[0]) {
1192 char cfg[] = "/tmp/ubifs_cfg";
1193
1194 /* Mount volume and try extroot (using fstab from that vol) */
1195 mkdir_p(cfg);
1196 if (!mount(blkdev_path, cfg, "ubifs", MS_NOATIME, NULL)) {
1197 err = mount_extroot(cfg);
1198 umount2(cfg, MNT_DETACH);
1199 }
1200 if (err < 0)
1201 rmdir("/tmp/overlay");
1202 rmdir(cfg);
1203 return err;
1204 }
1205 #endif
1206
1207 return mount_extroot(NULL);
1208 }
1209
1210 static int main_mount(int argc, char **argv)
1211 {
1212 struct blkid_struct_probe *pr;
1213
1214 if (config_load(NULL))
1215 return -1;
1216
1217 cache_load(1);
1218 list_for_each_entry(pr, &devices, list)
1219 mount_device(pr, 0);
1220
1221 handle_swapfiles(true);
1222
1223 return 0;
1224 }
1225
1226 static int main_umount(int argc, char **argv)
1227 {
1228 struct blkid_struct_probe *pr;
1229
1230 if (config_load(NULL))
1231 return -1;
1232
1233 handle_swapfiles(false);
1234
1235 cache_load(0);
1236 list_for_each_entry(pr, &devices, list)
1237 umount_device(pr);
1238
1239 return 0;
1240 }
1241
1242 static int main_detect(int argc, char **argv)
1243 {
1244 struct blkid_struct_probe *pr;
1245
1246 cache_load(0);
1247 printf("config 'global'\n");
1248 printf("\toption\tanon_swap\t'0'\n");
1249 printf("\toption\tanon_mount\t'0'\n");
1250 printf("\toption\tauto_swap\t'1'\n");
1251 printf("\toption\tauto_mount\t'1'\n");
1252 printf("\toption\tdelay_root\t'5'\n");
1253 printf("\toption\tcheck_fs\t'0'\n\n");
1254 list_for_each_entry(pr, &devices, list)
1255 print_block_uci(pr);
1256
1257 return 0;
1258 }
1259
1260 static int main_info(int argc, char **argv)
1261 {
1262 int i;
1263 struct blkid_struct_probe *pr;
1264
1265 cache_load(1);
1266 if (argc == 2) {
1267 list_for_each_entry(pr, &devices, list)
1268 print_block_info(pr);
1269
1270 return 0;
1271 };
1272
1273 for (i = 2; i < argc; i++) {
1274 struct stat s;
1275
1276 if (stat(argv[i], &s)) {
1277 ULOG_ERR("failed to stat %s\n", argv[i]);
1278 continue;
1279 }
1280 if (!S_ISBLK(s.st_mode)) {
1281 ULOG_ERR("%s is not a block device\n", argv[i]);
1282 continue;
1283 }
1284 pr = find_block_info(NULL, NULL, argv[i]);
1285 if (pr)
1286 print_block_info(pr);
1287 }
1288
1289 return 0;
1290 }
1291
1292 static int swapon_usage(void)
1293 {
1294 fprintf(stderr, "Usage: swapon [-s] [-a] [[-p pri] DEVICE]\n\n"
1295 "\tStart swapping on [DEVICE]\n"
1296 " -a\tStart swapping on all swap devices\n"
1297 " -p pri\tSet priority of swap device\n"
1298 " -s\tShow summary\n");
1299 return -1;
1300 }
1301
1302 static int main_swapon(int argc, char **argv)
1303 {
1304 int ch;
1305 FILE *fp;
1306 char *lineptr;
1307 size_t s;
1308 struct blkid_struct_probe *pr;
1309 int flags = 0;
1310 int pri;
1311 struct stat st;
1312 int err;
1313
1314 while ((ch = getopt(argc, argv, "ap:s")) != -1) {
1315 switch(ch) {
1316 case 's':
1317 fp = fopen("/proc/swaps", "r");
1318 lineptr = NULL;
1319
1320 if (!fp) {
1321 ULOG_ERR("failed to open /proc/swaps\n");
1322 return -1;
1323 }
1324 while (getline(&lineptr, &s, fp) > 0)
1325 printf("%s", lineptr);
1326 if (lineptr)
1327 free(lineptr);
1328 fclose(fp);
1329 return 0;
1330 case 'a':
1331 cache_load(0);
1332 list_for_each_entry(pr, &devices, list) {
1333 if (strcmp(pr->id->name, "swap"))
1334 continue;
1335 if (swapon(pr->dev, 0))
1336 ULOG_ERR("failed to swapon %s\n", pr->dev);
1337 }
1338 return 0;
1339 case 'p':
1340 pri = atoi(optarg);
1341 if (pri >= 0)
1342 flags = ((pri << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
1343 break;
1344 default:
1345 return swapon_usage();
1346 }
1347
1348 }
1349
1350 if (optind != (argc - 1))
1351 return swapon_usage();
1352
1353 if (stat(argv[optind], &st) || (!S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))) {
1354 ULOG_ERR("%s is not a block device or file\n", argv[optind]);
1355 return -1;
1356 }
1357 err = swapon(argv[optind], flags);
1358 if (err) {
1359 ULOG_ERR("failed to swapon %s (%d)\n", argv[optind], err);
1360 return err;
1361 }
1362
1363 return 0;
1364 }
1365
1366 static int main_swapoff(int argc, char **argv)
1367 {
1368 if (argc != 2) {
1369 ULOG_ERR("Usage: swapoff [-a] [DEVICE]\n\n"
1370 "\tStop swapping on DEVICE\n"
1371 " -a\tStop swapping on all swap devices\n");
1372 return -1;
1373 }
1374
1375 if (!strcmp(argv[1], "-a")) {
1376 FILE *fp = fopen("/proc/swaps", "r");
1377 char line[256];
1378
1379 if (!fp) {
1380 ULOG_ERR("failed to open /proc/swaps\n");
1381 return -1;
1382 }
1383 if (fgets(line, sizeof(line), fp))
1384 while (fgets(line, sizeof(line), fp)) {
1385 char *end = strchr(line, ' ');
1386 int err;
1387
1388 if (!end)
1389 continue;
1390 *end = '\0';
1391 err = swapoff(line);
1392 if (err)
1393 ULOG_ERR("failed to swapoff %s (%d)\n", line, err);
1394 }
1395 fclose(fp);
1396 } else {
1397 struct stat s;
1398 int err;
1399
1400 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1401 ULOG_ERR("%s is not a block device or file\n", argv[1]);
1402 return -1;
1403 }
1404 err = swapoff(argv[1]);
1405 if (err) {
1406 ULOG_ERR("failed to swapoff %s (%d)\n", argv[1], err);
1407 return err;
1408 }
1409 }
1410
1411 return 0;
1412 }
1413
1414 int main(int argc, char **argv)
1415 {
1416 char *base = basename(*argv);
1417
1418 umask(0);
1419
1420 ulog_open(-1, -1, "block");
1421 ulog_threshold(LOG_NOTICE);
1422
1423 if (!strcmp(base, "swapon"))
1424 return main_swapon(argc, argv);
1425
1426 if (!strcmp(base, "swapoff"))
1427 return main_swapoff(argc, argv);
1428
1429 if ((argc > 1) && !strcmp(base, "block")) {
1430 if (!strcmp(argv[1], "info"))
1431 return main_info(argc, argv);
1432
1433 if (!strcmp(argv[1], "detect"))
1434 return main_detect(argc, argv);
1435
1436 if (!strcmp(argv[1], "hotplug"))
1437 return main_hotplug(argc, argv);
1438
1439 if (!strcmp(argv[1], "extroot"))
1440 return main_extroot(argc, argv);
1441
1442 if (!strcmp(argv[1], "mount"))
1443 return main_mount(argc, argv);
1444
1445 if (!strcmp(argv[1], "umount"))
1446 return main_umount(argc, argv);
1447
1448 if (!strcmp(argv[1], "remount")) {
1449 int ret = main_umount(argc, argv);
1450
1451 if (!ret)
1452 ret = main_mount(argc, argv);
1453 return ret;
1454 }
1455 }
1456
1457 ULOG_ERR("Usage: block <info|mount|umount|detect>\n");
1458
1459 return -1;
1460 }
OpenWrt filesystem utilities