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9d22458c5e624c18d62a5ac7807b1df92b264ee5
[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 "probe.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 probe_info* _probe_path(char *path)
465 {
466 struct probe_info *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 return probe_path(path);
479 }
480
481 static int _cache_load(const char *path)
482 {
483 int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
484 int j;
485 glob_t gl;
486
487 if (glob(path, gl_flags, NULL, &gl) < 0)
488 return -1;
489
490 for (j = 0; j < gl.gl_pathc; j++) {
491 struct probe_info *pr = _probe_path(gl.gl_pathv[j]);
492 if (pr)
493 list_add_tail(&pr->list, &devices);
494 }
495
496 globfree(&gl);
497
498 return 0;
499 }
500
501 static void cache_load(int mtd)
502 {
503 if (mtd) {
504 _cache_load("/dev/mtdblock*");
505 _cache_load("/dev/ubiblock*");
506 _cache_load("/dev/ubi[0-9]*");
507 }
508 _cache_load("/dev/loop*");
509 _cache_load("/dev/mmcblk*");
510 _cache_load("/dev/sd*");
511 _cache_load("/dev/hd*");
512 _cache_load("/dev/md*");
513 _cache_load("/dev/vd*");
514 _cache_load("/dev/mapper/*");
515 }
516
517
518 static int print_block_uci(struct probe_info *pr)
519 {
520 if (!strcmp(pr->type, "swap")) {
521 printf("config 'swap'\n");
522 } else {
523 printf("config 'mount'\n");
524 printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev));
525 }
526 if (pr->uuid)
527 printf("\toption\tuuid\t'%s'\n", pr->uuid);
528 else
529 printf("\toption\tdevice\t'%s'\n", pr->dev);
530 printf("\toption\tenabled\t'0'\n\n");
531
532 return 0;
533 }
534
535 static struct probe_info* find_block_info(char *uuid, char *label, char *path)
536 {
537 struct probe_info *pr = NULL;
538
539 if (uuid)
540 list_for_each_entry(pr, &devices, list)
541 if (pr->uuid && !strcasecmp(pr->uuid, uuid))
542 return pr;
543
544 if (label)
545 list_for_each_entry(pr, &devices, list)
546 if (pr->label && !strcmp(pr->label, label))
547 return pr;
548
549 if (path)
550 list_for_each_entry(pr, &devices, list)
551 if (pr->dev && !strcmp(basename(pr->dev), basename(path)))
552 return pr;
553
554 return NULL;
555 }
556
557 static char* find_mount_point(char *block)
558 {
559 FILE *fp = fopen("/proc/self/mountinfo", "r");
560 static char line[256];
561 int len = strlen(block);
562 char *point = NULL, *pos, *tmp, *cpoint, *devname;
563 struct stat s;
564 int rstat;
565 unsigned int minor, major;
566
567 if (!fp)
568 return NULL;
569
570 rstat = stat(block, &s);
571
572 while (fgets(line, sizeof(line), fp)) {
573 pos = strchr(line, ' ');
574 if (!pos)
575 continue;
576
577 pos = strchr(pos + 1, ' ');
578 if (!pos)
579 continue;
580
581 tmp = ++pos;
582 pos = strchr(pos, ':');
583 if (!pos)
584 continue;
585
586 *pos = '\0';
587 major = atoi(tmp);
588 tmp = ++pos;
589 pos = strchr(pos, ' ');
590 if (!pos)
591 continue;
592
593 *pos = '\0';
594 minor = atoi(tmp);
595 pos = strchr(pos + 1, ' ');
596 if (!pos)
597 continue;
598 tmp = ++pos;
599
600 pos = strchr(pos, ' ');
601 if (!pos)
602 continue;
603 *pos = '\0';
604 cpoint = tmp;
605
606 pos = strchr(pos + 1, ' ');
607 if (!pos)
608 continue;
609
610 pos = strchr(pos + 1, ' ');
611 if (!pos)
612 continue;
613
614 pos = strchr(pos + 1, ' ');
615 if (!pos)
616 continue;
617
618 tmp = ++pos;
619 pos = strchr(pos, ' ');
620 if (!pos)
621 continue;
622
623 *pos = '\0';
624 devname = tmp;
625 if (!strncmp(block, devname, len)) {
626 point = strdup(cpoint);
627 break;
628 }
629
630 if (rstat)
631 continue;
632
633 if (!S_ISBLK(s.st_mode))
634 continue;
635
636 if (major == major(s.st_rdev) &&
637 minor == minor(s.st_rdev)) {
638 point = strdup(cpoint);
639 break;
640 }
641 }
642
643 fclose(fp);
644
645 return point;
646 }
647
648 static int print_block_info(struct probe_info *pr)
649 {
650 static char *mp;
651
652 mp = find_mount_point(pr->dev);
653 printf("%s:", pr->dev);
654 if (pr->uuid)
655 printf(" UUID=\"%s\"", pr->uuid);
656
657 if (pr->label)
658 printf(" LABEL=\"%s\"", pr->label);
659
660 if (pr->name)
661 printf(" NAME=\"%s\"", pr->name);
662
663 if (pr->version)
664 printf(" VERSION=\"%s\"", pr->version);
665
666 if (mp) {
667 printf(" MOUNT=\"%s\"", mp);
668 free(mp);
669 }
670
671 printf(" TYPE=\"%s\"\n", pr->type);
672
673 return 0;
674 }
675
676 static void mkdir_p(char *dir)
677 {
678 char *l = strrchr(dir, '/');
679
680 if (l) {
681 *l = '\0';
682 mkdir_p(dir);
683 *l = '/';
684 mkdir(dir, 0755);
685 }
686 }
687
688 static void check_filesystem(struct probe_info *pr)
689 {
690 pid_t pid;
691 struct stat statbuf;
692 const char *e2fsck = "/usr/sbin/e2fsck";
693 const char *dosfsck = "/usr/sbin/dosfsck";
694 const char *ckfs;
695
696 /* UBIFS does not need stuff like fsck */
697 if (!strncmp(pr->type, "ubifs", 5))
698 return;
699
700 if (!strncmp(pr->type, "vfat", 4)) {
701 ckfs = dosfsck;
702 } else if (!strncmp(pr->type, "ext", 3)) {
703 ckfs = e2fsck;
704 } else {
705 ULOG_ERR("check_filesystem: %s is not supported\n", pr->type);
706 return;
707 }
708
709 if (stat(ckfs, &statbuf) < 0) {
710 ULOG_ERR("check_filesystem: %s not found\n", ckfs);
711 return;
712 }
713
714 pid = fork();
715 if (!pid) {
716 execl(ckfs, ckfs, "-p", pr->dev, NULL);
717 exit(-1);
718 } else if (pid > 0) {
719 int status;
720
721 waitpid(pid, &status, 0);
722 if (WEXITSTATUS(status))
723 ULOG_ERR("check_filesystem: %s returned %d\n", ckfs, WEXITSTATUS(status));
724 }
725 }
726
727 static void handle_swapfiles(bool on)
728 {
729 struct stat s;
730 struct mount *m;
731 struct probe_info *pr;
732
733 vlist_for_each_element(&mounts, m, node)
734 {
735 if (m->type != TYPE_SWAP || !m->target)
736 continue;
737
738 if (stat(m->target, &s) || !S_ISREG(s.st_mode))
739 continue;
740
741 pr = _probe_path(m->target);
742
743 if (!pr)
744 continue;
745
746 if (!strcmp(pr->type, "swap")) {
747 if (on)
748 swapon(pr->dev, m->prio);
749 else
750 swapoff(pr->dev);
751 }
752
753 free(pr);
754 }
755 }
756
757 static int mount_device(struct probe_info *pr, int hotplug)
758 {
759 struct mount *m;
760 char *device;
761 char *mp;
762
763 if (!pr)
764 return -1;
765
766 device = basename(pr->dev);
767
768 if (!strcmp(pr->type, "swap")) {
769 if (hotplug && !auto_swap)
770 return -1;
771 m = find_swap(pr->uuid, pr->label, device);
772 if (m || anon_swap)
773 swapon(pr->dev, (m) ? (m->prio) : (0));
774
775 return 0;
776 }
777
778 if (hotplug && !auto_mount)
779 return -1;
780
781 mp = find_mount_point(pr->dev);
782 if (mp) {
783 ULOG_ERR("%s is already mounted on %s\n", pr->dev, mp);
784 free(mp);
785 return -1;
786 }
787
788 m = find_block(pr->uuid, pr->label, device, NULL);
789 if (m && m->extroot)
790 return -1;
791
792 if (m) {
793 char *target = m->target;
794 char _target[32];
795 int err = 0;
796
797 if (!target) {
798 snprintf(_target, sizeof(_target), "/mnt/%s", device);
799 target = _target;
800 }
801 mkdir_p(target);
802
803 if (check_fs)
804 check_filesystem(pr);
805
806 err = mount(pr->dev, target, pr->type, m->flags,
807 (m->options) ? (m->options) : (""));
808 if (err)
809 ULOG_ERR("mounting %s (%s) as %s failed (%d) - %s\n",
810 pr->dev, pr->type, target, err, strerror(err));
811 else
812 handle_swapfiles(true);
813 return err;
814 }
815
816 if (anon_mount) {
817 char target[32];
818 int err = 0;
819
820 snprintf(target, sizeof(target), "/mnt/%s", device);
821 mkdir_p(target);
822
823 if (check_fs)
824 check_filesystem(pr);
825
826 err = mount(pr->dev, target, pr->type, 0, "");
827 if (err)
828 ULOG_ERR("mounting %s (%s) as %s failed (%d) - %s\n",
829 pr->dev, pr->type, target, err, strerror(err));
830 else
831 handle_swapfiles(true);
832 return err;
833 }
834
835 return 0;
836 }
837
838 static int umount_device(struct probe_info *pr)
839 {
840 struct mount *m;
841 char *device = basename(pr->dev);
842 char *mp;
843 int err;
844
845 if (!pr)
846 return -1;
847
848 if (!strcmp(pr->type, "swap"))
849 return -1;
850
851 mp = find_mount_point(pr->dev);
852 if (!mp)
853 return -1;
854
855 m = find_block(pr->uuid, pr->label, device, NULL);
856 if (m && m->extroot)
857 return -1;
858
859 err = umount2(mp, MNT_DETACH);
860 if (err)
861 ULOG_ERR("unmounting %s (%s) failed (%d) - %s\n",
862 pr->dev, mp, err, strerror(err));
863 else
864 ULOG_INFO("unmounted %s (%s)\n",
865 pr->dev, mp);
866
867 free(mp);
868 return err;
869 }
870
871 static int main_hotplug(int argc, char **argv)
872 {
873 char path[32];
874 char *action, *device, *mount_point;
875
876 action = getenv("ACTION");
877 device = getenv("DEVNAME");
878
879 if (!action || !device)
880 return -1;
881 snprintf(path, sizeof(path), "/dev/%s", device);
882
883 if (!strcmp(action, "remove")) {
884 int err = 0;
885 mount_point = find_mount_point(path);
886 if (mount_point)
887 err = umount2(mount_point, MNT_DETACH);
888
889 if (err)
890 ULOG_ERR("umount of %s failed (%d) - %s\n",
891 mount_point, err, strerror(err));
892
893 free(mount_point);
894 return 0;
895 } else if (strcmp(action, "add")) {
896 ULOG_ERR("Unkown action %s\n", action);
897
898 return -1;
899 }
900
901 if (config_load(NULL))
902 return -1;
903 cache_load(0);
904
905 return mount_device(find_block_info(NULL, NULL, path), 1);
906 }
907
908 static int find_block_mtd(char *name, char *part, int plen)
909 {
910 FILE *fp = fopen("/proc/mtd", "r");
911 static char line[256];
912 char *index = NULL;
913
914 if(!fp)
915 return -1;
916
917 while (!index && fgets(line, sizeof(line), fp)) {
918 if (strstr(line, name)) {
919 char *eol = strstr(line, ":");
920
921 if (!eol)
922 continue;
923
924 *eol = '\0';
925 index = &line[3];
926 }
927 }
928
929 fclose(fp);
930
931 if (!index)
932 return -1;
933
934 snprintf(part, plen, "/dev/mtdblock%s", index);
935
936 return 0;
937 }
938
939 #ifdef UBIFS_EXTROOT
940 static int find_ubi_vol(libubi_t libubi, char *name, int *dev_num, int *vol_id)
941 {
942 int dev = 0;
943
944 while (ubi_dev_present(libubi, dev))
945 {
946 struct ubi_dev_info dev_info;
947 struct ubi_vol_info vol_info;
948
949 if (ubi_get_dev_info1(libubi, dev++, &dev_info))
950 continue;
951 if (ubi_get_vol_info1_nm(libubi, dev_info.dev_num, name, &vol_info))
952 continue;
953
954 *dev_num = dev_info.dev_num;
955 *vol_id = vol_info.vol_id;
956
957 return 0;
958 }
959
960 return -1;
961 }
962
963 static int find_block_ubi(libubi_t libubi, char *name, char *part, int plen)
964 {
965 int dev_num;
966 int vol_id;
967 int err = -1;
968
969 err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
970 if (!err)
971 snprintf(part, plen, "/dev/ubi%d_%d", dev_num, vol_id);
972
973 return err;
974 }
975
976 static int find_block_ubi_RO(libubi_t libubi, char *name, char *part, int plen)
977 {
978 int dev_num;
979 int vol_id;
980 int err = -1;
981
982 err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
983 if (!err)
984 snprintf(part, plen, "/dev/ubiblock%d_%d", dev_num, vol_id);
985
986 return err;
987 }
988
989 #else
990
991 static int find_root_dev(char *buf, int len)
992 {
993 DIR *d;
994 dev_t root;
995 struct stat s;
996 struct dirent *e;
997
998 if (stat("/", &s))
999 return -1;
1000
1001 if (!(d = opendir("/dev")))
1002 return -1;
1003
1004 root = s.st_dev;
1005
1006 while ((e = readdir(d)) != NULL) {
1007 snprintf(buf, len, "/dev/%s", e->d_name);
1008
1009 if (stat(buf, &s) || s.st_rdev != root)
1010 continue;
1011
1012 closedir(d);
1013 return 0;
1014 }
1015
1016 closedir(d);
1017 return -1;
1018 }
1019
1020 #endif
1021
1022 static int test_fs_support(const char *name)
1023 {
1024 char line[128], *p;
1025 int rv = -1;
1026 FILE *f;
1027
1028 if ((f = fopen("/proc/filesystems", "r")) != NULL) {
1029 while (fgets(line, sizeof(line), f)) {
1030 p = strtok(line, "\t\n");
1031
1032 if (p && !strcmp(p, "nodev"))
1033 p = strtok(NULL, "\t\n");
1034
1035 if (p && !strcmp(p, name)) {
1036 rv = 0;
1037 break;
1038 }
1039 }
1040 fclose(f);
1041 }
1042
1043 return rv;
1044 }
1045
1046 static int check_extroot(char *path)
1047 {
1048 struct probe_info *pr = NULL;
1049 char devpath[32];
1050
1051 #ifdef UBIFS_EXTROOT
1052 if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) {
1053 int err = -1;
1054 libubi_t libubi;
1055
1056 libubi = libubi_open();
1057 err = find_block_ubi_RO(libubi, "rootfs", devpath, sizeof(devpath));
1058 libubi_close(libubi);
1059 if (err)
1060 return -1;
1061 }
1062 #else
1063 if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) {
1064 if (find_root_dev(devpath, sizeof(devpath))) {
1065 ULOG_ERR("extroot: unable to determine root device\n");
1066 return -1;
1067 }
1068 }
1069 #endif
1070
1071 list_for_each_entry(pr, &devices, list) {
1072 if (!strcmp(pr->dev, devpath)) {
1073 struct stat s;
1074 FILE *fp = NULL;
1075 char tag[64];
1076 char uuid[64] = { 0 };
1077
1078 snprintf(tag, sizeof(tag), "%s/etc", path);
1079 if (stat(tag, &s))
1080 mkdir_p(tag);
1081
1082 snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
1083 if (stat(tag, &s)) {
1084 fp = fopen(tag, "w+");
1085 if (!fp) {
1086 ULOG_ERR("extroot: failed to write UUID to %s: %d (%s)\n",
1087 tag, errno, strerror(errno));
1088 /* return 0 to continue boot regardless of error */
1089 return 0;
1090 }
1091 fputs(pr->uuid, fp);
1092 fclose(fp);
1093 return 0;
1094 }
1095
1096 fp = fopen(tag, "r");
1097 if (!fp) {
1098 ULOG_ERR("extroot: failed to read UUID from %s: %d (%s)\n",
1099 tag, errno, strerror(errno));
1100 return -1;
1101 }
1102
1103 if (!fgets(uuid, sizeof(uuid), fp))
1104 ULOG_ERR("extroot: failed to read UUID from %s: %d (%s)\n",
1105 tag, errno, strerror(errno));
1106 fclose(fp);
1107
1108 if (*uuid && !strcasecmp(uuid, pr->uuid))
1109 return 0;
1110
1111 ULOG_ERR("extroot: UUID mismatch (root: %s, %s: %s)\n",
1112 pr->uuid, basename(path), uuid);
1113 return -1;
1114 }
1115 }
1116
1117 ULOG_ERR("extroot: unable to lookup root device %s\n", devpath);
1118 return -1;
1119 }
1120
1121 /*
1122 * Read info about extroot from UCI (using prefix) and mount it.
1123 */
1124 static int mount_extroot(char *cfg)
1125 {
1126 char overlay[] = "/tmp/extroot/overlay";
1127 char mnt[] = "/tmp/extroot/mnt";
1128 char *path = mnt;
1129 struct probe_info *pr;
1130 struct mount *m;
1131 int err = -1;
1132
1133 /* Load @cfg/etc/config/fstab */
1134 if (config_load(cfg))
1135 return -2;
1136
1137 /* See if there is extroot-specific mount config */
1138 m = find_block(NULL, NULL, NULL, "/");
1139 if (!m)
1140 m = find_block(NULL, NULL, NULL, "/overlay");
1141
1142 if (!m || !m->extroot)
1143 {
1144 ULOG_INFO("extroot: not configured\n");
1145 return -1;
1146 }
1147
1148 /* Find block device pointed by the mount config */
1149 pr = find_block_info(m->uuid, m->label, m->device);
1150
1151 if (!pr && delay_root){
1152 ULOG_INFO("extroot: device not present, retrying in %u seconds\n", delay_root);
1153 sleep(delay_root);
1154 make_devs();
1155 cache_load(0);
1156 pr = find_block_info(m->uuid, m->label, m->device);
1157 }
1158 if (pr) {
1159 if (strncmp(pr->type, "ext", 3) &&
1160 strncmp(pr->type, "ubifs", 5)) {
1161 ULOG_ERR("extroot: unsupported filesystem %s, try ext4\n", pr->type);
1162 return -1;
1163 }
1164
1165 if (test_fs_support(pr->type)) {
1166 ULOG_ERR("extroot: filesystem %s not supported by kernel\n", pr->type);
1167 return -1;
1168 }
1169
1170 if (m->overlay)
1171 path = overlay;
1172 mkdir_p(path);
1173
1174 if (check_fs)
1175 check_filesystem(pr);
1176
1177 err = mount(pr->dev, path, pr->type, m->flags,
1178 (m->options) ? (m->options) : (""));
1179
1180 if (err) {
1181 ULOG_ERR("extroot: mounting %s (%s) on %s failed: %d (%s)\n",
1182 pr->dev, pr->type, path, err, strerror(err));
1183 } else if (m->overlay) {
1184 err = check_extroot(path);
1185 if (err)
1186 umount(path);
1187 }
1188 } else {
1189 ULOG_ERR("extroot: cannot find device %s%s\n",
1190 (m->uuid ? "with UUID " : (m->label ? "with label " : "")),
1191 (m->uuid ? m->uuid : (m->label ? m->label : m->device)));
1192 }
1193
1194 return err;
1195 }
1196
1197 static int main_extroot(int argc, char **argv)
1198 {
1199 struct probe_info *pr;
1200 char blkdev_path[32] = { 0 };
1201 int err = -1;
1202 #ifdef UBIFS_EXTROOT
1203 libubi_t libubi;
1204 #endif
1205
1206 if (!getenv("PREINIT"))
1207 return -1;
1208
1209 if (argc != 2) {
1210 ULOG_ERR("Usage: block extroot\n");
1211 return -1;
1212 }
1213
1214 make_devs();
1215 cache_load(1);
1216
1217 /* enable LOG_INFO messages */
1218 ulog_threshold(LOG_INFO);
1219
1220 /*
1221 * Look for "rootfs_data". We will want to mount it and check for
1222 * extroot configuration.
1223 */
1224
1225 /* Start with looking for MTD partition */
1226 find_block_mtd("\"rootfs_data\"", blkdev_path, sizeof(blkdev_path));
1227 if (blkdev_path[0]) {
1228 pr = find_block_info(NULL, NULL, blkdev_path);
1229 if (pr && !strcmp(pr->type, "jffs2")) {
1230 char cfg[] = "/tmp/jffs_cfg";
1231
1232 /*
1233 * Mount MTD part and try extroot (using
1234 * /etc/config/fstab from that partition)
1235 */
1236 mkdir_p(cfg);
1237 if (!mount(blkdev_path, cfg, "jffs2", MS_NOATIME, NULL)) {
1238 err = mount_extroot(cfg);
1239 umount2(cfg, MNT_DETACH);
1240 }
1241 if (err < 0)
1242 rmdir("/tmp/overlay");
1243 rmdir(cfg);
1244 return err;
1245 }
1246 }
1247
1248 #ifdef UBIFS_EXTROOT
1249 /* ... but it also could be an UBI volume */
1250 memset(blkdev_path, 0, sizeof(blkdev_path));
1251 libubi = libubi_open();
1252 find_block_ubi(libubi, "rootfs_data", blkdev_path, sizeof(blkdev_path));
1253 libubi_close(libubi);
1254 if (blkdev_path[0]) {
1255 char cfg[] = "/tmp/ubifs_cfg";
1256
1257 /* Mount volume and try extroot (using fstab from that vol) */
1258 mkdir_p(cfg);
1259 if (!mount(blkdev_path, cfg, "ubifs", MS_NOATIME, NULL)) {
1260 err = mount_extroot(cfg);
1261 umount2(cfg, MNT_DETACH);
1262 }
1263 if (err < 0)
1264 rmdir("/tmp/overlay");
1265 rmdir(cfg);
1266 return err;
1267 }
1268 #endif
1269
1270 return mount_extroot(NULL);
1271 }
1272
1273 static int main_mount(int argc, char **argv)
1274 {
1275 struct probe_info *pr;
1276
1277 if (config_load(NULL))
1278 return -1;
1279
1280 cache_load(1);
1281 list_for_each_entry(pr, &devices, list)
1282 mount_device(pr, 0);
1283
1284 handle_swapfiles(true);
1285
1286 return 0;
1287 }
1288
1289 static int main_umount(int argc, char **argv)
1290 {
1291 struct probe_info *pr;
1292
1293 if (config_load(NULL))
1294 return -1;
1295
1296 handle_swapfiles(false);
1297
1298 cache_load(0);
1299 list_for_each_entry(pr, &devices, list)
1300 umount_device(pr);
1301
1302 return 0;
1303 }
1304
1305 static int main_detect(int argc, char **argv)
1306 {
1307 struct probe_info *pr;
1308
1309 cache_load(0);
1310 printf("config 'global'\n");
1311 printf("\toption\tanon_swap\t'0'\n");
1312 printf("\toption\tanon_mount\t'0'\n");
1313 printf("\toption\tauto_swap\t'1'\n");
1314 printf("\toption\tauto_mount\t'1'\n");
1315 printf("\toption\tdelay_root\t'5'\n");
1316 printf("\toption\tcheck_fs\t'0'\n\n");
1317 list_for_each_entry(pr, &devices, list)
1318 print_block_uci(pr);
1319
1320 return 0;
1321 }
1322
1323 static int main_info(int argc, char **argv)
1324 {
1325 int i;
1326 struct probe_info *pr;
1327
1328 cache_load(1);
1329 if (argc == 2) {
1330 list_for_each_entry(pr, &devices, list)
1331 print_block_info(pr);
1332
1333 return 0;
1334 };
1335
1336 for (i = 2; i < argc; i++) {
1337 struct stat s;
1338
1339 if (stat(argv[i], &s)) {
1340 ULOG_ERR("failed to stat %s\n", argv[i]);
1341 continue;
1342 }
1343 if (!S_ISBLK(s.st_mode) && !(S_ISCHR(s.st_mode) && major(s.st_rdev) == 250)) {
1344 ULOG_ERR("%s is not a block device\n", argv[i]);
1345 continue;
1346 }
1347 pr = find_block_info(NULL, NULL, argv[i]);
1348 if (pr)
1349 print_block_info(pr);
1350 }
1351
1352 return 0;
1353 }
1354
1355 static int swapon_usage(void)
1356 {
1357 fprintf(stderr, "Usage: swapon [-s] [-a] [[-p pri] DEVICE]\n\n"
1358 "\tStart swapping on [DEVICE]\n"
1359 " -a\tStart swapping on all swap devices\n"
1360 " -p pri\tSet priority of swap device\n"
1361 " -s\tShow summary\n");
1362 return -1;
1363 }
1364
1365 static int main_swapon(int argc, char **argv)
1366 {
1367 int ch;
1368 FILE *fp;
1369 char *lineptr;
1370 size_t s;
1371 struct probe_info *pr;
1372 int flags = 0;
1373 int pri;
1374 struct stat st;
1375 int err;
1376
1377 while ((ch = getopt(argc, argv, "ap:s")) != -1) {
1378 switch(ch) {
1379 case 's':
1380 fp = fopen("/proc/swaps", "r");
1381 lineptr = NULL;
1382
1383 if (!fp) {
1384 ULOG_ERR("failed to open /proc/swaps\n");
1385 return -1;
1386 }
1387 while (getline(&lineptr, &s, fp) > 0)
1388 printf("%s", lineptr);
1389 if (lineptr)
1390 free(lineptr);
1391 fclose(fp);
1392 return 0;
1393 case 'a':
1394 cache_load(0);
1395 list_for_each_entry(pr, &devices, list) {
1396 if (strcmp(pr->type, "swap"))
1397 continue;
1398 if (swapon(pr->dev, 0))
1399 ULOG_ERR("failed to swapon %s\n", pr->dev);
1400 }
1401 return 0;
1402 case 'p':
1403 pri = atoi(optarg);
1404 if (pri >= 0)
1405 flags = ((pri << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
1406 break;
1407 default:
1408 return swapon_usage();
1409 }
1410
1411 }
1412
1413 if (optind != (argc - 1))
1414 return swapon_usage();
1415
1416 if (stat(argv[optind], &st) || (!S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))) {
1417 ULOG_ERR("%s is not a block device or file\n", argv[optind]);
1418 return -1;
1419 }
1420 err = swapon(argv[optind], flags);
1421 if (err) {
1422 ULOG_ERR("failed to swapon %s (%d)\n", argv[optind], err);
1423 return err;
1424 }
1425
1426 return 0;
1427 }
1428
1429 static int main_swapoff(int argc, char **argv)
1430 {
1431 if (argc != 2) {
1432 ULOG_ERR("Usage: swapoff [-a] [DEVICE]\n\n"
1433 "\tStop swapping on DEVICE\n"
1434 " -a\tStop swapping on all swap devices\n");
1435 return -1;
1436 }
1437
1438 if (!strcmp(argv[1], "-a")) {
1439 FILE *fp = fopen("/proc/swaps", "r");
1440 char line[256];
1441
1442 if (!fp) {
1443 ULOG_ERR("failed to open /proc/swaps\n");
1444 return -1;
1445 }
1446 if (fgets(line, sizeof(line), fp))
1447 while (fgets(line, sizeof(line), fp)) {
1448 char *end = strchr(line, ' ');
1449 int err;
1450
1451 if (!end)
1452 continue;
1453 *end = '\0';
1454 err = swapoff(line);
1455 if (err)
1456 ULOG_ERR("failed to swapoff %s (%d)\n", line, err);
1457 }
1458 fclose(fp);
1459 } else {
1460 struct stat s;
1461 int err;
1462
1463 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1464 ULOG_ERR("%s is not a block device or file\n", argv[1]);
1465 return -1;
1466 }
1467 err = swapoff(argv[1]);
1468 if (err) {
1469 ULOG_ERR("failed to swapoff %s (%d)\n", argv[1], err);
1470 return err;
1471 }
1472 }
1473
1474 return 0;
1475 }
1476
1477 int main(int argc, char **argv)
1478 {
1479 char *base = basename(*argv);
1480
1481 umask(0);
1482
1483 ulog_open(-1, -1, "block");
1484 ulog_threshold(LOG_NOTICE);
1485
1486 if (!strcmp(base, "swapon"))
1487 return main_swapon(argc, argv);
1488
1489 if (!strcmp(base, "swapoff"))
1490 return main_swapoff(argc, argv);
1491
1492 if ((argc > 1) && !strcmp(base, "block")) {
1493 if (!strcmp(argv[1], "info"))
1494 return main_info(argc, argv);
1495
1496 if (!strcmp(argv[1], "detect"))
1497 return main_detect(argc, argv);
1498
1499 if (!strcmp(argv[1], "hotplug"))
1500 return main_hotplug(argc, argv);
1501
1502 if (!strcmp(argv[1], "extroot"))
1503 return main_extroot(argc, argv);
1504
1505 if (!strcmp(argv[1], "mount"))
1506 return main_mount(argc, argv);
1507
1508 if (!strcmp(argv[1], "umount"))
1509 return main_umount(argc, argv);
1510
1511 if (!strcmp(argv[1], "remount")) {
1512 int ret = main_umount(argc, argv);
1513
1514 if (!ret)
1515 ret = main_mount(argc, argv);
1516 return ret;
1517 }
1518 }
1519
1520 ULOG_ERR("Usage: block <info|mount|umount|detect>\n");
1521
1522 return -1;
1523 }
OpenWrt filesystem utilities