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libblkid-tiny: fix invalid open syscall return check
[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 #include <errno.h>
26 #include <fcntl.h>
27 #include <limits.h>
28
29 #include <sys/stat.h>
30 #include <sys/types.h>
31 #include <sys/swap.h>
32 #include <sys/mount.h>
33 #include <sys/wait.h>
34 #include <sys/sysmacros.h>
35
36 #include <linux/fs.h>
37
38 #include <uci.h>
39 #include <uci_blob.h>
40
41 #include <libubox/avl-cmp.h>
42 #include <libubox/blobmsg_json.h>
43 #include <libubox/list.h>
44 #include <libubox/ulog.h>
45 #include <libubox/utils.h>
46 #include <libubox/vlist.h>
47 #include <libubus.h>
48
49 #include "probe.h"
50
51 #define AUTOFS_MOUNT_PATH "/tmp/run/blockd/"
52
53 #ifdef UBIFS_EXTROOT
54 #include "libubi/libubi.h"
55 #endif
56
57 enum {
58 TYPE_MOUNT,
59 TYPE_SWAP,
60 };
61
62 enum {
63 TYPE_DEV,
64 TYPE_HOTPLUG,
65 TYPE_AUTOFS,
66 };
67
68 struct mount {
69 struct vlist_node node;
70 int type;
71
72 char *target;
73 char *path;
74 char *options;
75 uint32_t flags;
76 char *uuid;
77 char *label;
78 char *device;
79 int extroot;
80 int autofs;
81 int overlay;
82 int disabled_fsck;
83 unsigned int prio;
84 };
85
86 static struct vlist_tree mounts;
87 static struct blob_buf b;
88 static LIST_HEAD(devices);
89 static int anon_mount, anon_swap, auto_mount, auto_swap, check_fs;
90 static unsigned int delay_root;
91
92 enum {
93 CFG_ANON_MOUNT,
94 CFG_ANON_SWAP,
95 CFG_AUTO_MOUNT,
96 CFG_AUTO_SWAP,
97 CFG_DELAY_ROOT,
98 CFG_CHECK_FS,
99 __CFG_MAX
100 };
101
102 static const struct blobmsg_policy config_policy[__CFG_MAX] = {
103 [CFG_ANON_SWAP] = { .name = "anon_swap", .type = BLOBMSG_TYPE_INT32 },
104 [CFG_ANON_MOUNT] = { .name = "anon_mount", .type = BLOBMSG_TYPE_INT32 },
105 [CFG_AUTO_SWAP] = { .name = "auto_swap", .type = BLOBMSG_TYPE_INT32 },
106 [CFG_AUTO_MOUNT] = { .name = "auto_mount", .type = BLOBMSG_TYPE_INT32 },
107 [CFG_DELAY_ROOT] = { .name = "delay_root", .type = BLOBMSG_TYPE_INT32 },
108 [CFG_CHECK_FS] = { .name = "check_fs", .type = BLOBMSG_TYPE_INT32 },
109 };
110
111 enum {
112 MOUNT_UUID,
113 MOUNT_LABEL,
114 MOUNT_ENABLE,
115 MOUNT_TARGET,
116 MOUNT_DEVICE,
117 MOUNT_OPTIONS,
118 MOUNT_AUTOFS,
119 __MOUNT_MAX
120 };
121
122 static const struct uci_blob_param_list config_attr_list = {
123 .n_params = __CFG_MAX,
124 .params = config_policy,
125 };
126
127 static const struct blobmsg_policy mount_policy[__MOUNT_MAX] = {
128 [MOUNT_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
129 [MOUNT_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
130 [MOUNT_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
131 [MOUNT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
132 [MOUNT_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_STRING },
133 [MOUNT_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
134 [MOUNT_AUTOFS] = { .name = "autofs", .type = BLOBMSG_TYPE_INT32 },
135 };
136
137 static const struct uci_blob_param_list mount_attr_list = {
138 .n_params = __MOUNT_MAX,
139 .params = mount_policy,
140 };
141
142 enum {
143 SWAP_ENABLE,
144 SWAP_UUID,
145 SWAP_LABEL,
146 SWAP_DEVICE,
147 SWAP_PRIO,
148 __SWAP_MAX
149 };
150
151 static const struct blobmsg_policy swap_policy[__SWAP_MAX] = {
152 [SWAP_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
153 [SWAP_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
154 [SWAP_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
155 [SWAP_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
156 [SWAP_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 },
157 };
158
159 static const struct uci_blob_param_list swap_attr_list = {
160 .n_params = __SWAP_MAX,
161 .params = swap_policy,
162 };
163
164 struct mount_flag {
165 const char *name;
166 int32_t flag;
167 };
168
169 static const struct mount_flag mount_flags[] = {
170 { "sync", MS_SYNCHRONOUS },
171 { "async", ~MS_SYNCHRONOUS },
172 { "dirsync", MS_DIRSYNC },
173 { "mand", MS_MANDLOCK },
174 { "nomand", ~MS_MANDLOCK },
175 { "atime", ~MS_NOATIME },
176 { "noatime", MS_NOATIME },
177 { "dev", ~MS_NODEV },
178 { "nodev", MS_NODEV },
179 { "diratime", ~MS_NODIRATIME },
180 { "nodiratime", MS_NODIRATIME },
181 { "exec", ~MS_NOEXEC },
182 { "noexec", MS_NOEXEC },
183 { "suid", ~MS_NOSUID },
184 { "nosuid", MS_NOSUID },
185 { "rw", ~MS_RDONLY },
186 { "ro", MS_RDONLY },
187 { "relatime", MS_RELATIME },
188 { "norelatime", ~MS_RELATIME },
189 { "strictatime", MS_STRICTATIME },
190 { "acl", MS_POSIXACL },
191 { "noacl", ~MS_POSIXACL },
192 { "nouser_xattr", MS_NOUSER },
193 { "user_xattr", ~MS_NOUSER },
194 };
195
196 static char *blobmsg_get_strdup(struct blob_attr *attr)
197 {
198 if (!attr)
199 return NULL;
200
201 return strdup(blobmsg_get_string(attr));
202 }
203
204 static char *blobmsg_get_basename(struct blob_attr *attr)
205 {
206 if (!attr)
207 return NULL;
208
209 return strdup(basename(blobmsg_get_string(attr)));
210 }
211
212 static void parse_mount_options(struct mount *m, char *optstr)
213 {
214 int i;
215 bool is_flag;
216 char *p, *opts, *last;
217
218 m->flags = 0;
219 m->options = NULL;
220
221 if (!optstr || !*optstr)
222 return;
223
224 m->options = opts = calloc(1, strlen(optstr) + 1);
225
226 if (!m->options)
227 return;
228
229 p = last = optstr;
230
231 do {
232 p = strchr(p, ',');
233
234 if (p)
235 *p++ = 0;
236
237 for (i = 0, is_flag = false; i < ARRAY_SIZE(mount_flags); i++) {
238 if (!strcmp(last, mount_flags[i].name)) {
239 if (mount_flags[i].flag < 0)
240 m->flags &= (uint32_t)mount_flags[i].flag;
241 else
242 m->flags |= (uint32_t)mount_flags[i].flag;
243 is_flag = true;
244 break;
245 }
246 }
247
248 if (!is_flag)
249 opts += sprintf(opts, "%s%s", (opts > m->options) ? "," : "", last);
250
251 last = p;
252
253 } while (p);
254
255 free(optstr);
256 }
257
258 static int mount_add(struct uci_section *s)
259 {
260 struct blob_attr *tb[__MOUNT_MAX] = { 0 };
261 struct mount *m;
262
263 blob_buf_init(&b, 0);
264 uci_to_blob(&b, s, &mount_attr_list);
265 blobmsg_parse(mount_policy, __MOUNT_MAX, tb, blob_data(b.head), blob_len(b.head));
266
267 if (!tb[MOUNT_LABEL] && !tb[MOUNT_UUID] && !tb[MOUNT_DEVICE])
268 return -1;
269
270 if (tb[MOUNT_ENABLE] && !blobmsg_get_u32(tb[MOUNT_ENABLE]))
271 return -1;
272
273 m = malloc(sizeof(struct mount));
274 m->type = TYPE_MOUNT;
275 m->uuid = blobmsg_get_strdup(tb[MOUNT_UUID]);
276 m->label = blobmsg_get_strdup(tb[MOUNT_LABEL]);
277 m->target = blobmsg_get_strdup(tb[MOUNT_TARGET]);
278 m->device = blobmsg_get_basename(tb[MOUNT_DEVICE]);
279 if (tb[MOUNT_AUTOFS])
280 m->autofs = blobmsg_get_u32(tb[MOUNT_AUTOFS]);
281 else
282 m->autofs = 0;
283 parse_mount_options(m, blobmsg_get_strdup(tb[MOUNT_OPTIONS]));
284
285 m->overlay = m->extroot = 0;
286 if (m->target && !strcmp(m->target, "/"))
287 m->extroot = 1;
288 if (m->target && !strcmp(m->target, "/overlay"))
289 m->extroot = m->overlay = 1;
290
291 if (m->target && *m->target != '/') {
292 ULOG_WARN("ignoring mount section %s due to invalid target '%s'\n",
293 s->e.name, m->target);
294 free(m);
295 return -1;
296 }
297
298 if (m->uuid)
299 vlist_add(&mounts, &m->node, m->uuid);
300 else if (m->label)
301 vlist_add(&mounts, &m->node, m->label);
302 else if (m->device)
303 vlist_add(&mounts, &m->node, m->device);
304
305 return 0;
306 }
307
308 static int swap_add(struct uci_section *s)
309 {
310 struct blob_attr *tb[__SWAP_MAX] = { 0 };
311 struct mount *m;
312
313 blob_buf_init(&b, 0);
314 uci_to_blob(&b, s, &swap_attr_list);
315 blobmsg_parse(swap_policy, __SWAP_MAX, tb, blob_data(b.head), blob_len(b.head));
316
317 if (!tb[SWAP_UUID] && !tb[SWAP_LABEL] && !tb[SWAP_DEVICE])
318 return -1;
319
320 m = malloc(sizeof(struct mount));
321 memset(m, 0, sizeof(struct mount));
322 m->type = TYPE_SWAP;
323 m->uuid = blobmsg_get_strdup(tb[SWAP_UUID]);
324 m->label = blobmsg_get_strdup(tb[SWAP_LABEL]);
325 m->device = blobmsg_get_basename(tb[SWAP_DEVICE]);
326 if (tb[SWAP_PRIO])
327 m->prio = blobmsg_get_u32(tb[SWAP_PRIO]);
328 if (m->prio)
329 m->prio = ((m->prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
330
331 if ((!tb[SWAP_ENABLE]) || blobmsg_get_u32(tb[SWAP_ENABLE])) {
332 /* store complete swap path */
333 if (tb[SWAP_DEVICE])
334 m->target = blobmsg_get_strdup(tb[SWAP_DEVICE]);
335
336 if (m->uuid)
337 vlist_add(&mounts, &m->node, m->uuid);
338 else if (m->label)
339 vlist_add(&mounts, &m->node, m->label);
340 else if (m->device)
341 vlist_add(&mounts, &m->node, m->device);
342 }
343
344 return 0;
345 }
346
347 static int global_add(struct uci_section *s)
348 {
349 struct blob_attr *tb[__CFG_MAX] = { 0 };
350
351 blob_buf_init(&b, 0);
352 uci_to_blob(&b, s, &config_attr_list);
353 blobmsg_parse(config_policy, __CFG_MAX, tb, blob_data(b.head), blob_len(b.head));
354
355 if ((tb[CFG_ANON_MOUNT]) && blobmsg_get_u32(tb[CFG_ANON_MOUNT]))
356 anon_mount = 1;
357 if ((tb[CFG_ANON_SWAP]) && blobmsg_get_u32(tb[CFG_ANON_SWAP]))
358 anon_swap = 1;
359
360 if ((tb[CFG_AUTO_MOUNT]) && blobmsg_get_u32(tb[CFG_AUTO_MOUNT]))
361 auto_mount = 1;
362 if ((tb[CFG_AUTO_SWAP]) && blobmsg_get_u32(tb[CFG_AUTO_SWAP]))
363 auto_swap = 1;
364
365 if (tb[CFG_DELAY_ROOT])
366 delay_root = blobmsg_get_u32(tb[CFG_DELAY_ROOT]);
367
368 if ((tb[CFG_CHECK_FS]) && blobmsg_get_u32(tb[CFG_CHECK_FS]))
369 check_fs = 1;
370
371 return 0;
372 }
373
374 static struct mount* find_swap(const char *uuid, const char *label, const char *device)
375 {
376 struct mount *m;
377
378 vlist_for_each_element(&mounts, m, node) {
379 if (m->type != TYPE_SWAP)
380 continue;
381 if (uuid && m->uuid && !strcasecmp(m->uuid, uuid))
382 return m;
383 if (label && m->label && !strcmp(m->label, label))
384 return m;
385 if (device && m->device && !strcmp(m->device, device))
386 return m;
387 }
388
389 return NULL;
390 }
391
392 static struct mount* find_block(const char *uuid, const char *label, const char *device,
393 const char *target)
394 {
395 struct mount *m;
396
397 vlist_for_each_element(&mounts, m, node) {
398 if (m->type != TYPE_MOUNT)
399 continue;
400 if (m->uuid && uuid && !strcasecmp(m->uuid, uuid))
401 return m;
402 if (m->label && label && !strcmp(m->label, label))
403 return m;
404 if (m->target && target && !strcmp(m->target, target))
405 return m;
406 if (m->device && device && !strcmp(m->device, device))
407 return m;
408 }
409
410 return NULL;
411 }
412
413 static void mounts_update(struct vlist_tree *tree, struct vlist_node *node_new,
414 struct vlist_node *node_old)
415 {
416 }
417
418 static struct uci_package * config_try_load(struct uci_context *ctx, char *path)
419 {
420 char *file = basename(path);
421 char *dir = dirname(path);
422 char *err;
423 struct uci_package *pkg;
424
425 uci_set_confdir(ctx, dir);
426 ULOG_INFO("attempting to load %s/%s\n", dir, file);
427
428 if (uci_load(ctx, file, &pkg)) {
429 uci_get_errorstr(ctx, &err, file);
430 ULOG_ERR("unable to load configuration (%s)\n", err);
431
432 free(err);
433 return NULL;
434 }
435
436 return pkg;
437 }
438
439 static int config_load(char *cfg)
440 {
441 struct uci_context *ctx = uci_alloc_context();
442 struct uci_package *pkg = NULL;
443 struct uci_element *e;
444 char path[64];
445
446 vlist_init(&mounts, avl_strcmp, mounts_update);
447
448 if (cfg) {
449 snprintf(path, sizeof(path), "%s/upper/etc/config/fstab", cfg);
450 pkg = config_try_load(ctx, path);
451
452 if (!pkg) {
453 snprintf(path, sizeof(path), "%s/etc/config/fstab", cfg);
454 pkg = config_try_load(ctx, path);
455 }
456 }
457
458 if (!pkg) {
459 snprintf(path, sizeof(path), "/etc/config/fstab");
460 pkg = config_try_load(ctx, path);
461 }
462
463 if (!pkg) {
464 ULOG_ERR("no usable configuration\n");
465 return -1;
466 }
467
468 vlist_update(&mounts);
469 uci_foreach_element(&pkg->sections, e) {
470 struct uci_section *s = uci_to_section(e);
471
472 if (!strcmp(s->type, "mount"))
473 mount_add(s);
474 if (!strcmp(s->type, "swap"))
475 swap_add(s);
476 if (!strcmp(s->type, "global"))
477 global_add(s);
478 }
479 vlist_flush(&mounts);
480
481 return 0;
482 }
483
484 static struct probe_info* _probe_path(char *path)
485 {
486 struct probe_info *pr, *epr;
487 char tmppath[64];
488
489 pr = probe_path(path);
490 if (!pr)
491 return NULL;
492
493 if (path[5] == 'u' && path[6] == 'b' && path[7] == 'i' &&
494 path[8] >= '0' && path[8] <= '9' ) {
495 /* skip ubi device if not UBIFS (as it requires ubiblock) */
496 if (strcmp("ubifs", pr->type))
497 return NULL;
498
499 /* skip ubi device if ubiblock device is present */
500 snprintf(tmppath, sizeof(tmppath), "/dev/ubiblock%s", path + 8);
501 list_for_each_entry(epr, &devices, list)
502 if (!strcmp(epr->dev, tmppath))
503 return NULL;
504 }
505
506 return pr;
507 }
508
509 static int _cache_load(const char *path)
510 {
511 int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
512 int j;
513 glob_t gl;
514
515 if (glob(path, gl_flags, NULL, &gl) < 0)
516 return -1;
517
518 for (j = 0; j < gl.gl_pathc; j++) {
519 struct probe_info *pr = _probe_path(gl.gl_pathv[j]);
520 if (pr)
521 list_add_tail(&pr->list, &devices);
522 }
523
524 globfree(&gl);
525
526 return 0;
527 }
528
529 static void cache_load(int mtd)
530 {
531 if (mtd) {
532 _cache_load("/dev/mtdblock*");
533 _cache_load("/dev/ubiblock*");
534 _cache_load("/dev/ubi[0-9]*");
535 }
536 _cache_load("/dev/loop*");
537 _cache_load("/dev/mmcblk*");
538 _cache_load("/dev/sd*");
539 _cache_load("/dev/hd*");
540 _cache_load("/dev/md*");
541 _cache_load("/dev/nvme*");
542 _cache_load("/dev/vd*");
543 _cache_load("/dev/xvd*");
544 _cache_load("/dev/dm-*");
545 }
546
547
548 static struct probe_info* find_block_info(char *uuid, char *label, char *path)
549 {
550 struct probe_info *pr = NULL;
551
552 if (uuid)
553 list_for_each_entry(pr, &devices, list)
554 if (pr->uuid && !strcasecmp(pr->uuid, uuid))
555 return pr;
556
557 if (label)
558 list_for_each_entry(pr, &devices, list)
559 if (pr->label && !strcmp(pr->label, label))
560 return pr;
561
562 if (path)
563 list_for_each_entry(pr, &devices, list)
564 if (pr->dev && !strcmp(basename(pr->dev), basename(path)))
565 return pr;
566
567 return NULL;
568 }
569
570 static char* find_mount_point(char *block)
571 {
572 FILE *fp = fopen("/proc/self/mountinfo", "r");
573 static char line[256];
574 char *point = NULL, *pos, *tmp, *cpoint, *devname;
575 struct stat s;
576 int rstat;
577 unsigned int minor, major;
578
579 if (!fp)
580 return NULL;
581
582 rstat = stat(block, &s);
583
584 while (fgets(line, sizeof(line), fp)) {
585 pos = strchr(line, ' ');
586 if (!pos)
587 continue;
588
589 pos = strchr(pos + 1, ' ');
590 if (!pos)
591 continue;
592
593 tmp = ++pos;
594 pos = strchr(pos, ':');
595 if (!pos)
596 continue;
597
598 *pos = '\0';
599 major = atoi(tmp);
600 tmp = ++pos;
601 pos = strchr(pos, ' ');
602 if (!pos)
603 continue;
604
605 *pos = '\0';
606 minor = atoi(tmp);
607 pos = strchr(pos + 1, ' ');
608 if (!pos)
609 continue;
610 tmp = ++pos;
611
612 pos = strchr(pos, ' ');
613 if (!pos)
614 continue;
615 *pos = '\0';
616 cpoint = tmp;
617
618 pos = strchr(pos + 1, ' ');
619 if (!pos)
620 continue;
621
622 pos = strchr(pos + 1, ' ');
623 if (!pos)
624 continue;
625
626 pos = strchr(pos + 1, ' ');
627 if (!pos)
628 continue;
629
630 tmp = ++pos;
631 pos = strchr(pos, ' ');
632 if (!pos)
633 continue;
634
635 *pos = '\0';
636 devname = tmp;
637 if (!strcmp(block, devname)) {
638 point = strdup(cpoint);
639 break;
640 }
641
642 if (rstat)
643 continue;
644
645 if (!S_ISBLK(s.st_mode))
646 continue;
647
648 if (major == major(s.st_rdev) &&
649 minor == minor(s.st_rdev)) {
650 point = strdup(cpoint);
651 break;
652 }
653 }
654
655 fclose(fp);
656
657 return point;
658 }
659
660 static int print_block_uci(struct probe_info *pr)
661 {
662 if (!strcmp(pr->type, "swap")) {
663 printf("config 'swap'\n");
664 } else {
665 char *mp = find_mount_point(pr->dev);
666
667 printf("config 'mount'\n");
668 if (mp) {
669 printf("\toption\ttarget\t'%s'\n", mp);
670 free(mp);
671 } else {
672 printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev));
673 }
674 }
675 if (pr->uuid)
676 printf("\toption\tuuid\t'%s'\n", pr->uuid);
677 else
678 printf("\toption\tdevice\t'%s'\n", pr->dev);
679 printf("\toption\tenabled\t'0'\n\n");
680
681 return 0;
682 }
683
684 static int print_block_info(struct probe_info *pr)
685 {
686 static char *mp;
687
688 mp = find_mount_point(pr->dev);
689 printf("%s:", pr->dev);
690 if (pr->uuid)
691 printf(" UUID=\"%s\"", pr->uuid);
692
693 if (pr->label)
694 printf(" LABEL=\"%s\"", pr->label);
695
696 if (pr->version)
697 printf(" VERSION=\"%s\"", pr->version);
698
699 if (mp) {
700 printf(" MOUNT=\"%s\"", mp);
701 free(mp);
702 }
703
704 printf(" TYPE=\"%s\"\n", pr->type);
705
706 return 0;
707 }
708
709 static void check_filesystem(struct probe_info *pr)
710 {
711 pid_t pid;
712 struct stat statbuf;
713 const char *e2fsck = "/usr/sbin/e2fsck";
714 const char *f2fsck = "/usr/sbin/fsck.f2fs";
715 const char *fatfsck = "/usr/sbin/fsck.fat";
716 const char *btrfsck = "/usr/bin/btrfsck";
717 const char *ntfsck = "/usr/bin/ntfsfix";
718 const char *ckfs;
719
720 /* UBIFS does not need stuff like fsck */
721 if (!strncmp(pr->type, "ubifs", 5))
722 return;
723
724 if (!strncmp(pr->type, "vfat", 4)) {
725 ckfs = fatfsck;
726 } else if (!strncmp(pr->type, "f2fs", 4)) {
727 ckfs = f2fsck;
728 } else if (!strncmp(pr->type, "ext", 3)) {
729 ckfs = e2fsck;
730 } else if (!strncmp(pr->type, "btrfs", 5)) {
731 ckfs = btrfsck;
732 } else if (!strncmp(pr->type, "ntfs", 4)) {
733 ckfs = ntfsck;
734 } else {
735 ULOG_ERR("check_filesystem: %s is not supported\n", pr->type);
736 return;
737 }
738
739 if (stat(ckfs, &statbuf) < 0) {
740 ULOG_ERR("check_filesystem: %s not found\n", ckfs);
741 return;
742 }
743
744 pid = fork();
745 if (!pid) {
746 if(!strncmp(pr->type, "f2fs", 4)) {
747 execl(ckfs, ckfs, "-f", pr->dev, NULL);
748 exit(EXIT_FAILURE);
749 } else if(!strncmp(pr->type, "btrfs", 5)) {
750 execl(ckfs, ckfs, "--repair", pr->dev, NULL);
751 exit(EXIT_FAILURE);
752 } else if(!strncmp(pr->type, "ntfs", 4)) {
753 execl(ckfs, ckfs, "-b", pr->dev, NULL);
754 exit(EXIT_FAILURE);
755 } else {
756 execl(ckfs, ckfs, "-p", pr->dev, NULL);
757 exit(EXIT_FAILURE);
758 }
759 } else if (pid > 0) {
760 int status;
761
762 waitpid(pid, &status, 0);
763 if (WIFEXITED(status) && WEXITSTATUS(status))
764 ULOG_ERR("check_filesystem: %s returned %d\n", ckfs, WEXITSTATUS(status));
765 if (WIFSIGNALED(status))
766 ULOG_ERR("check_filesystem: %s terminated by %s\n", ckfs, strsignal(WTERMSIG(status)));
767 }
768 }
769
770 static void handle_swapfiles(bool on)
771 {
772 struct stat s;
773 struct mount *m;
774 struct probe_info *pr;
775
776 vlist_for_each_element(&mounts, m, node)
777 {
778 if (m->type != TYPE_SWAP || !m->target)
779 continue;
780
781 if (stat(m->target, &s) || !S_ISREG(s.st_mode))
782 continue;
783
784 pr = _probe_path(m->target);
785
786 if (!pr)
787 continue;
788
789 if (!strcmp(pr->type, "swap")) {
790 if (on)
791 swapon(pr->dev, m->prio);
792 else
793 swapoff(pr->dev);
794 }
795
796 free(pr);
797 }
798 }
799
800 static void to_devnull(int fd)
801 {
802 int devnull = open("/dev/null", fd ? O_WRONLY : O_RDONLY);
803
804 if (devnull >= 0)
805 dup2(devnull, fd);
806
807 if (devnull > STDERR_FILENO)
808 close(devnull);
809 }
810
811 static int exec_mount(const char *source, const char *target,
812 const char *fstype, const char *options)
813 {
814 pid_t pid;
815 struct stat s;
816 FILE *mount_fd;
817 int err, status, pfds[2];
818 char errmsg[128], cmd[sizeof("/sbin/mount.XXXXXXXXXXXXXXXX\0")];
819
820 snprintf(cmd, sizeof(cmd), "/sbin/mount.%s", fstype);
821
822 if (stat(cmd, &s) < 0 || !S_ISREG(s.st_mode) || !(s.st_mode & S_IXUSR)) {
823 ULOG_ERR("No \"mount.%s\" utility available\n", fstype);
824 return -1;
825 }
826
827 if (pipe(pfds) < 0)
828 return -1;
829
830 fcntl(pfds[0], F_SETFD, fcntl(pfds[0], F_GETFD) | FD_CLOEXEC);
831 fcntl(pfds[1], F_SETFD, fcntl(pfds[1], F_GETFD) | FD_CLOEXEC);
832
833 pid = vfork();
834
835 switch (pid) {
836 case -1:
837 close(pfds[0]);
838 close(pfds[1]);
839
840 return -1;
841
842 case 0:
843 to_devnull(STDIN_FILENO);
844 to_devnull(STDOUT_FILENO);
845
846 dup2(pfds[1], STDERR_FILENO);
847 close(pfds[0]);
848 close(pfds[1]);
849
850 if (options && *options)
851 execl(cmd, cmd, "-o", options, source, target, NULL);
852 else
853 execl(cmd, cmd, source, target, NULL);
854
855 return -1;
856
857 default:
858 close(pfds[1]);
859
860 mount_fd = fdopen(pfds[0], "r");
861
862 while (fgets(errmsg, sizeof(errmsg), mount_fd))
863 ULOG_ERR("mount.%s: %s", fstype, errmsg);
864
865 fclose(mount_fd);
866
867 err = waitpid(pid, &status, 0);
868
869 if (err != -1) {
870 if (status != 0) {
871 ULOG_ERR("mount.%s: failed with status %d\n", fstype, status);
872 errno = EINVAL;
873 err = -1;
874 } else {
875 errno = 0;
876 err = 0;
877 }
878 }
879
880 break;
881 }
882
883 return err;
884 }
885
886 static int handle_mount(const char *source, const char *target,
887 const char *fstype, struct mount *m)
888 {
889 int i, err;
890 size_t mount_opts_len;
891 char *mount_opts = NULL, *ptr;
892
893 err = mount(source, target, fstype, m ? m->flags : 0,
894 (m && m->options) ? m->options : "");
895
896 /* Requested file system type is not available in kernel,
897 attempt to call mount helper. */
898 if (err == -1 && errno == ENODEV) {
899 if (m) {
900 /* Convert mount flags back into string representation,
901 first calculate needed length of string buffer... */
902 mount_opts_len = 1 + (m->options ? strlen(m->options) : 0);
903
904 for (i = 0; i < ARRAY_SIZE(mount_flags); i++)
905 if ((mount_flags[i].flag > 0) &&
906 (mount_flags[i].flag < INT_MAX) &&
907 (m->flags & (uint32_t)mount_flags[i].flag))
908 mount_opts_len += strlen(mount_flags[i].name) + 1;
909
910 /* ... then now allocate and fill it ... */
911 ptr = mount_opts = calloc(1, mount_opts_len);
912
913 if (!ptr) {
914 errno = ENOMEM;
915 return -1;
916 }
917
918 if (m->options)
919 ptr += sprintf(ptr, "%s,", m->options);
920
921 for (i = 0; i < ARRAY_SIZE(mount_flags); i++)
922 if ((mount_flags[i].flag > 0) &&
923 (mount_flags[i].flag < INT_MAX) &&
924 (m->flags & (uint32_t)mount_flags[i].flag))
925 ptr += sprintf(ptr, "%s,", mount_flags[i].name);
926
927 mount_opts[mount_opts_len - 1] = 0;
928 }
929
930 /* ... and now finally invoke the external mount program */
931 err = exec_mount(source, target, fstype, mount_opts);
932 }
933
934 return err;
935 }
936
937 static int blockd_notify(const char *method, char *device, struct mount *m,
938 struct probe_info *pr)
939 {
940 struct ubus_context *ctx = ubus_connect(NULL);
941 uint32_t id;
942 int err;
943
944 if (!ctx)
945 return -ENXIO;
946
947 if (!ubus_lookup_id(ctx, "block", &id)) {
948 struct blob_buf buf = { 0 };
949 char *d = strrchr(device, '/');
950
951 if (d)
952 d++;
953 else
954 d = device;
955
956 blob_buf_init(&buf, 0);
957
958 if (m) {
959
960 blobmsg_add_string(&buf, "device", d);
961 if (m->uuid)
962 blobmsg_add_string(&buf, "uuid", m->uuid);
963 if (m->label)
964 blobmsg_add_string(&buf, "label", m->label);
965 if (m->target)
966 blobmsg_add_string(&buf, "target", m->target);
967 if (m->options)
968 blobmsg_add_string(&buf, "options", m->options);
969 if (m->autofs)
970 blobmsg_add_u32(&buf, "autofs", m->autofs);
971 if (pr->type)
972 blobmsg_add_string(&buf, "type", pr->type);
973 if (pr->version)
974 blobmsg_add_string(&buf, "version", pr->version);
975 } else if (pr) {
976 blobmsg_add_string(&buf, "device", d);
977 if (pr->uuid)
978 blobmsg_add_string(&buf, "uuid", pr->uuid);
979 if (pr->label)
980 blobmsg_add_string(&buf, "label", pr->label);
981 if (pr->type)
982 blobmsg_add_string(&buf, "type", pr->type);
983 if (pr->version)
984 blobmsg_add_string(&buf, "version", pr->version);
985 blobmsg_add_u32(&buf, "anon", 1);
986 } else {
987 blobmsg_add_string(&buf, "device", d);
988 blobmsg_add_u32(&buf, "remove", 1);
989 }
990
991 err = ubus_invoke(ctx, id, method, buf.head, NULL, NULL, 3000);
992 } else {
993 err = -ENOENT;
994 }
995
996 ubus_free(ctx);
997
998 return err;
999 }
1000
1001 static int mount_device(struct probe_info *pr, int type)
1002 {
1003 struct mount *m;
1004 struct stat st;
1005 char *_target = NULL;
1006 char *target;
1007 char *device;
1008 char *mp;
1009 int err;
1010
1011 if (!pr)
1012 return -1;
1013
1014 device = basename(pr->dev);
1015
1016 if (!strcmp(pr->type, "swap")) {
1017 if ((type == TYPE_HOTPLUG) && !auto_swap)
1018 return -1;
1019 m = find_swap(pr->uuid, pr->label, device);
1020 if (m || anon_swap)
1021 swapon(pr->dev, (m) ? (m->prio) : (0));
1022
1023 return 0;
1024 }
1025
1026 m = find_block(pr->uuid, pr->label, device, NULL);
1027 if (m && m->extroot)
1028 return -1;
1029
1030 mp = find_mount_point(pr->dev);
1031 if (mp) {
1032 if (m && m->type == TYPE_MOUNT && m->target && strcmp(m->target, mp)) {
1033 ULOG_ERR("%s is already mounted on %s\n", pr->dev, mp);
1034 err = -1;
1035 } else
1036 err = 0;
1037 free(mp);
1038 return err;
1039 }
1040
1041 if (type == TYPE_HOTPLUG)
1042 blockd_notify("hotplug", device, m, pr);
1043
1044 /* Check if device should be mounted & set the target directory */
1045 if (m) {
1046 switch (type) {
1047 case TYPE_HOTPLUG:
1048 if (m->autofs)
1049 return 0;
1050 if (!auto_mount)
1051 return -1;
1052 break;
1053 case TYPE_AUTOFS:
1054 if (!m->autofs)
1055 return -1;
1056 break;
1057 case TYPE_DEV:
1058 if (m->autofs)
1059 return -1;
1060 break;
1061 }
1062
1063 if (m->autofs) {
1064 if (asprintf(&_target, "/tmp/run/blockd/%s", device) == -1)
1065 exit(ENOMEM);
1066
1067 target = _target;
1068 } else if (m->target) {
1069 target = m->target;
1070 } else {
1071 if (asprintf(&_target, "/mnt/%s", device) == -1)
1072 exit(ENOMEM);
1073
1074 target = _target;
1075 }
1076 } else if (anon_mount) {
1077 if (asprintf(&_target, "/mnt/%s", device) == -1)
1078 exit(ENOMEM);
1079
1080 target = _target;
1081 } else {
1082 /* No reason to mount this device */
1083 return 0;
1084 }
1085
1086 /* Mount the device */
1087
1088 if (check_fs)
1089 check_filesystem(pr);
1090
1091 mkdir_p(target, 0755);
1092 if (!lstat(target, &st) && S_ISLNK(st.st_mode))
1093 unlink(target);
1094
1095 err = handle_mount(pr->dev, target, pr->type, m);
1096 if (err) {
1097 ULOG_ERR("mounting %s (%s) as %s failed (%d) - %m\n",
1098 pr->dev, pr->type, target, errno);
1099
1100 if (_target)
1101 free(_target);
1102
1103 return err;
1104 }
1105
1106 if (_target)
1107 free(_target);
1108
1109 handle_swapfiles(true);
1110
1111 if (type != TYPE_AUTOFS)
1112 blockd_notify("mount", device, NULL, NULL);
1113
1114 return 0;
1115 }
1116
1117 static int umount_device(char *path, int type, bool all)
1118 {
1119 char *mp, *devpath;
1120 int err;
1121
1122 if (strlen(path) > 5 && !strncmp("/dev/", path, 5)) {
1123 mp = find_mount_point(path);
1124 } else {
1125 devpath = malloc(strlen(path) + 6);
1126 strcpy(devpath, "/dev/");
1127 strcat(devpath, path);
1128 mp = find_mount_point(devpath);
1129 free(devpath);
1130 }
1131
1132 if (!mp)
1133 return -1;
1134 if (!strcmp(mp, "/") && !all)
1135 return 0;
1136
1137 if (type != TYPE_AUTOFS)
1138 blockd_notify("umount", basename(path), NULL, NULL);
1139
1140 err = umount2(mp, MNT_DETACH);
1141 if (err) {
1142 ULOG_ERR("unmounting %s (%s) failed (%d) - %m\n", path, mp,
1143 errno);
1144 } else {
1145 ULOG_INFO("unmounted %s (%s)\n", path, mp);
1146 rmdir(mp);
1147 }
1148
1149 free(mp);
1150 return err;
1151 }
1152
1153 static int mount_action(char *action, char *device, int type)
1154 {
1155 char *path = NULL;
1156 struct probe_info *pr;
1157
1158 if (!action || !device)
1159 return -1;
1160
1161 if (!strcmp(action, "remove")) {
1162 if (type == TYPE_HOTPLUG)
1163 blockd_notify("hotplug", device, NULL, NULL);
1164
1165 umount_device(device, type, true);
1166
1167 return 0;
1168 } else if (strcmp(action, "add")) {
1169 ULOG_ERR("Unkown action %s\n", action);
1170
1171 return -1;
1172 }
1173
1174 if (config_load(NULL))
1175 return -1;
1176
1177 cache_load(1);
1178
1179 list_for_each_entry(pr, &devices, list)
1180 if (!strcmp(basename(pr->dev), device))
1181 path = pr->dev;
1182
1183 if (!path)
1184 return -1;
1185
1186 return mount_device(find_block_info(NULL, NULL, path), type);
1187 }
1188
1189 static int main_hotplug(int argc, char **argv)
1190 {
1191 return mount_action(getenv("ACTION"), getenv("DEVNAME"), TYPE_HOTPLUG);
1192 }
1193
1194 static int main_autofs(int argc, char **argv)
1195 {
1196 int err = 0;
1197
1198 if (argc < 3)
1199 return -1;
1200
1201 if (!strcmp(argv[2], "start")) {
1202 struct probe_info *pr;
1203
1204 if (config_load(NULL))
1205 return -1;
1206
1207 cache_load(1);
1208 list_for_each_entry(pr, &devices, list) {
1209 struct mount *m;
1210 char *mp;
1211
1212 if (!strcmp(pr->type, "swap"))
1213 continue;
1214
1215 m = find_block(pr->uuid, pr->label, NULL, NULL);
1216 if (m && m->extroot)
1217 continue;
1218
1219 blockd_notify("hotplug", pr->dev, m, pr);
1220 if ((!m || !m->autofs) && (mp = find_mount_point(pr->dev))) {
1221 blockd_notify("mount", pr->dev, NULL, NULL);
1222 free(mp);
1223 }
1224 }
1225 } else {
1226 if (argc < 4)
1227 return -EINVAL;
1228
1229 err = mount_action(argv[2], argv[3], TYPE_AUTOFS);
1230 }
1231
1232 if (err) {
1233 ULOG_ERR("autofs: \"%s\" action has failed: %d\n", argv[2], err);
1234 }
1235
1236 return err;
1237 }
1238
1239 static int find_block_mtd(char *name, char *part, int plen)
1240 {
1241 FILE *fp = fopen("/proc/mtd", "r");
1242 static char line[256];
1243 char *index = NULL;
1244
1245 if(!fp)
1246 return -1;
1247
1248 while (!index && fgets(line, sizeof(line), fp)) {
1249 if (strstr(line, name)) {
1250 char *eol = strstr(line, ":");
1251
1252 if (!eol)
1253 continue;
1254
1255 *eol = '\0';
1256 index = &line[3];
1257 }
1258 }
1259
1260 fclose(fp);
1261
1262 if (!index)
1263 return -1;
1264
1265 snprintf(part, plen, "/dev/mtdblock%s", index);
1266
1267 return 0;
1268 }
1269
1270 #ifdef UBIFS_EXTROOT
1271 static int find_ubi_vol(libubi_t libubi, char *name, int *dev_num, int *vol_id)
1272 {
1273 int dev = 0;
1274
1275 while (ubi_dev_present(libubi, dev))
1276 {
1277 struct ubi_dev_info dev_info;
1278 struct ubi_vol_info vol_info;
1279
1280 if (ubi_get_dev_info1(libubi, dev++, &dev_info))
1281 continue;
1282 if (ubi_get_vol_info1_nm(libubi, dev_info.dev_num, name, &vol_info))
1283 continue;
1284
1285 *dev_num = dev_info.dev_num;
1286 *vol_id = vol_info.vol_id;
1287
1288 return 0;
1289 }
1290
1291 return -1;
1292 }
1293
1294 static int find_block_ubi(libubi_t libubi, char *name, char *part, int plen)
1295 {
1296 int dev_num;
1297 int vol_id;
1298 int err = -1;
1299
1300 err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
1301 if (!err)
1302 snprintf(part, plen, "/dev/ubi%d_%d", dev_num, vol_id);
1303
1304 return err;
1305 }
1306
1307 static int find_block_ubi_RO(libubi_t libubi, char *name, char *part, int plen)
1308 {
1309 int dev_num;
1310 int vol_id;
1311 int err = -1;
1312
1313 err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
1314 if (!err)
1315 snprintf(part, plen, "/dev/ubiblock%d_%d", dev_num, vol_id);
1316
1317 return err;
1318 }
1319 #endif
1320
1321 static int find_root_dev(char *buf, int len)
1322 {
1323 DIR *d;
1324 dev_t root;
1325 struct stat s;
1326 struct dirent *e;
1327
1328 if (stat("/", &s))
1329 return -1;
1330
1331 if (!(d = opendir("/dev")))
1332 return -1;
1333
1334 root = s.st_dev;
1335
1336 while ((e = readdir(d)) != NULL) {
1337 snprintf(buf, len, "/dev/%s", e->d_name);
1338
1339 if (stat(buf, &s) || s.st_rdev != root)
1340 continue;
1341
1342 closedir(d);
1343 return 0;
1344 }
1345
1346 closedir(d);
1347 return -1;
1348 }
1349
1350 static int test_fs_support(const char *name)
1351 {
1352 char line[128], *p;
1353 int rv = -1;
1354 FILE *f;
1355
1356 if ((f = fopen("/proc/filesystems", "r")) != NULL) {
1357 while (fgets(line, sizeof(line), f)) {
1358 p = strtok(line, "\t\n");
1359
1360 if (p && !strcmp(p, "nodev"))
1361 p = strtok(NULL, "\t\n");
1362
1363 if (p && !strcmp(p, name)) {
1364 rv = 0;
1365 break;
1366 }
1367 }
1368 fclose(f);
1369 }
1370
1371 return rv;
1372 }
1373
1374 /**
1375 * Check if mounted partition is a valid extroot
1376 *
1377 * @path target mount point
1378 *
1379 * Valid extroot partition has to contain /etc/.extroot-uuid with UUID of root
1380 * device. This function reads UUID and verifies it OR writes UUID to
1381 * .extroot-uuid if it doesn't exist yet (first extroot usage).
1382 */
1383 static int check_extroot(char *path)
1384 {
1385 struct probe_info *pr = NULL;
1386 struct probe_info *tmp;
1387 struct stat s;
1388 char uuid[64] = { 0 };
1389 char devpath[32];
1390 char tag[64];
1391 FILE *fp;
1392 int err;
1393
1394 err = find_block_mtd("\"rootfs\"", devpath, sizeof(devpath));
1395 #ifdef UBIFS_EXTROOT
1396 if (err) {
1397 libubi_t libubi;
1398
1399 libubi = libubi_open();
1400 err = find_block_ubi_RO(libubi, "rootfs", devpath, sizeof(devpath));
1401 libubi_close(libubi);
1402 }
1403 #endif
1404 if (err) {
1405 err = find_root_dev(devpath, sizeof(devpath));
1406 }
1407 if (err) {
1408 ULOG_ERR("extroot: unable to determine root device\n");
1409 return -1;
1410 }
1411
1412 /* Find root device probe_info so we know its UUID */
1413 list_for_each_entry(tmp, &devices, list) {
1414 if (!strcmp(tmp->dev, devpath)) {
1415 pr = tmp;
1416 break;
1417 }
1418 }
1419 if (!pr) {
1420 ULOG_ERR("extroot: unable to lookup root device %s\n", devpath);
1421 return -1;
1422 }
1423
1424 snprintf(tag, sizeof(tag), "%s/etc", path);
1425 if (stat(tag, &s))
1426 mkdir_p(tag, 0755);
1427
1428 snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
1429 if (stat(tag, &s)) {
1430 fp = fopen(tag, "w+");
1431 if (!fp) {
1432 ULOG_ERR("extroot: failed to write UUID to %s: %d (%m)\n",
1433 tag, errno);
1434 /* return 0 to continue boot regardless of error */
1435 return 0;
1436 }
1437 fputs(pr->uuid, fp);
1438 fclose(fp);
1439 return 0;
1440 }
1441
1442 fp = fopen(tag, "r");
1443 if (!fp) {
1444 ULOG_ERR("extroot: failed to read UUID from %s: %d (%m)\n", tag,
1445 errno);
1446 return -1;
1447 }
1448
1449 if (!fgets(uuid, sizeof(uuid), fp))
1450 ULOG_ERR("extroot: failed to read UUID from %s: %d (%m)\n", tag,
1451 errno);
1452 fclose(fp);
1453
1454 if (*uuid && !strcasecmp(uuid, pr->uuid))
1455 return 0;
1456
1457 ULOG_ERR("extroot: UUID mismatch (root: %s, %s: %s)\n", pr->uuid,
1458 basename(path), uuid);
1459 return -1;
1460 }
1461
1462 /*
1463 * Read info about extroot from UCI (using prefix) and mount it.
1464 */
1465 static int mount_extroot(char *cfg)
1466 {
1467 char overlay[] = "/tmp/extroot/overlay";
1468 char mnt[] = "/tmp/extroot/mnt";
1469 char *path = mnt;
1470 struct probe_info *pr;
1471 struct mount *m;
1472 int err = -1;
1473
1474 /* Load @cfg/etc/config/fstab */
1475 if (config_load(cfg))
1476 return -2;
1477
1478 /* See if there is extroot-specific mount config */
1479 m = find_block(NULL, NULL, NULL, "/");
1480 if (!m)
1481 m = find_block(NULL, NULL, NULL, "/overlay");
1482
1483 if (!m || !m->extroot)
1484 {
1485 ULOG_INFO("extroot: not configured\n");
1486 return -1;
1487 }
1488
1489 /* Find block device pointed by the mount config */
1490 pr = find_block_info(m->uuid, m->label, m->device);
1491
1492 if (!pr && delay_root){
1493 ULOG_INFO("extroot: device not present, retrying in %u seconds\n", delay_root);
1494 sleep(delay_root);
1495 make_devs();
1496 cache_load(1);
1497 pr = find_block_info(m->uuid, m->label, m->device);
1498 }
1499 if (pr) {
1500 if (strncmp(pr->type, "ext", 3) &&
1501 strncmp(pr->type, "f2fs", 4) &&
1502 strncmp(pr->type, "btrfs", 5) &&
1503 strncmp(pr->type, "ntfs", 4) &&
1504 strncmp(pr->type, "ubifs", 5)) {
1505 ULOG_ERR("extroot: unsupported filesystem %s, try ext4, f2fs, btrfs, ntfs or ubifs\n", pr->type);
1506 return -1;
1507 }
1508
1509 if (test_fs_support(pr->type)) {
1510 ULOG_ERR("extroot: filesystem %s not supported by kernel\n", pr->type);
1511 return -1;
1512 }
1513
1514 if (m->overlay)
1515 path = overlay;
1516 mkdir_p(path, 0755);
1517
1518 if (check_fs)
1519 check_filesystem(pr);
1520
1521 err = mount(pr->dev, path, pr->type, m->flags,
1522 (m->options) ? (m->options) : (""));
1523
1524 if (err) {
1525 ULOG_ERR("extroot: mounting %s (%s) on %s failed: %d (%m)\n",
1526 pr->dev, pr->type, path, errno);
1527 } else if (m->overlay) {
1528 err = check_extroot(path);
1529 if (err)
1530 umount(path);
1531 }
1532 } else {
1533 ULOG_ERR("extroot: cannot find device %s%s\n",
1534 (m->uuid ? "with UUID " : (m->label ? "with label " : "")),
1535 (m->uuid ? m->uuid : (m->label ? m->label : m->device)));
1536 }
1537
1538 return err;
1539 }
1540
1541 /**
1542 * Look for extroot config and mount it if present
1543 *
1544 * Look for /etc/config/fstab on all supported partitions and use it for
1545 * mounting extroot if specified.
1546 */
1547 static int main_extroot(int argc, char **argv)
1548 {
1549 struct probe_info *pr;
1550 char blkdev_path[32] = { 0 };
1551 int err = -1;
1552 #ifdef UBIFS_EXTROOT
1553 libubi_t libubi;
1554 #endif
1555
1556 if (!getenv("PREINIT"))
1557 return -1;
1558
1559 if (argc != 2) {
1560 ULOG_ERR("Usage: block extroot\n");
1561 return -1;
1562 }
1563
1564 make_devs();
1565 cache_load(1);
1566
1567 /* enable LOG_INFO messages */
1568 ulog_threshold(LOG_INFO);
1569
1570 /*
1571 * Look for "rootfs_data". We will want to mount it and check for
1572 * extroot configuration.
1573 */
1574
1575 /* Start with looking for MTD partition */
1576 find_block_mtd("\"rootfs_data\"", blkdev_path, sizeof(blkdev_path));
1577 if (blkdev_path[0]) {
1578 pr = find_block_info(NULL, NULL, blkdev_path);
1579 if (pr && !strcmp(pr->type, "jffs2")) {
1580 char cfg[] = "/tmp/jffs_cfg";
1581
1582 /*
1583 * Mount MTD part and try extroot (using
1584 * /etc/config/fstab from that partition)
1585 */
1586 mkdir_p(cfg, 0755);
1587 if (!mount(blkdev_path, cfg, "jffs2", MS_NOATIME, NULL)) {
1588 err = mount_extroot(cfg);
1589 umount2(cfg, MNT_DETACH);
1590 }
1591 if (err < 0)
1592 rmdir("/tmp/overlay");
1593 rmdir(cfg);
1594 return err;
1595 }
1596 }
1597
1598 #ifdef UBIFS_EXTROOT
1599 /* ... but it also could be an UBI volume */
1600 memset(blkdev_path, 0, sizeof(blkdev_path));
1601 libubi = libubi_open();
1602 find_block_ubi(libubi, "rootfs_data", blkdev_path, sizeof(blkdev_path));
1603 libubi_close(libubi);
1604 if (blkdev_path[0]) {
1605 char cfg[] = "/tmp/ubifs_cfg";
1606
1607 /* Mount volume and try extroot (using fstab from that vol) */
1608 mkdir_p(cfg, 0755);
1609 if (!mount(blkdev_path, cfg, "ubifs", MS_NOATIME, NULL)) {
1610 err = mount_extroot(cfg);
1611 umount2(cfg, MNT_DETACH);
1612 }
1613 if (err < 0)
1614 rmdir("/tmp/overlay");
1615 rmdir(cfg);
1616 return err;
1617 }
1618 #endif
1619
1620 /* As a last resort look for /etc/config/fstab on "rootfs" partition */
1621 return mount_extroot(NULL);
1622 }
1623
1624 static int main_mount(int argc, char **argv)
1625 {
1626 struct probe_info *pr;
1627
1628 if (config_load(NULL))
1629 return -1;
1630
1631 cache_load(1);
1632 list_for_each_entry(pr, &devices, list)
1633 mount_device(pr, TYPE_DEV);
1634
1635 handle_swapfiles(true);
1636
1637 return 0;
1638 }
1639
1640 static int main_umount(int argc, char **argv)
1641 {
1642 struct probe_info *pr;
1643 bool all = false;
1644
1645 if (config_load(NULL))
1646 return -1;
1647
1648 handle_swapfiles(false);
1649
1650 cache_load(1);
1651
1652 if (argc == 3)
1653 all = !strcmp(argv[2], "-a");
1654
1655 list_for_each_entry(pr, &devices, list) {
1656 struct mount *m;
1657
1658 if (!strcmp(pr->type, "swap"))
1659 continue;
1660
1661 m = find_block(pr->uuid, pr->label, basename(pr->dev), NULL);
1662 if (m && m->extroot)
1663 continue;
1664
1665 umount_device(pr->dev, TYPE_DEV, all);
1666 }
1667
1668 return 0;
1669 }
1670
1671 static int main_detect(int argc, char **argv)
1672 {
1673 struct probe_info *pr;
1674
1675 cache_load(0);
1676 printf("config 'global'\n");
1677 printf("\toption\tanon_swap\t'0'\n");
1678 printf("\toption\tanon_mount\t'0'\n");
1679 printf("\toption\tauto_swap\t'1'\n");
1680 printf("\toption\tauto_mount\t'1'\n");
1681 printf("\toption\tdelay_root\t'5'\n");
1682 printf("\toption\tcheck_fs\t'0'\n\n");
1683 list_for_each_entry(pr, &devices, list)
1684 print_block_uci(pr);
1685
1686 return 0;
1687 }
1688
1689 static int main_info(int argc, char **argv)
1690 {
1691 int i;
1692 struct probe_info *pr;
1693
1694 cache_load(1);
1695 if (argc == 2) {
1696 list_for_each_entry(pr, &devices, list)
1697 print_block_info(pr);
1698
1699 return 0;
1700 };
1701
1702 for (i = 2; i < argc; i++) {
1703 struct stat s;
1704
1705 if (stat(argv[i], &s)) {
1706 ULOG_ERR("failed to stat %s\n", argv[i]);
1707 continue;
1708 }
1709 if (!S_ISBLK(s.st_mode) && !(S_ISCHR(s.st_mode) && major(s.st_rdev) == 250)) {
1710 ULOG_ERR("%s is not a block device\n", argv[i]);
1711 continue;
1712 }
1713 pr = find_block_info(NULL, NULL, argv[i]);
1714 if (pr)
1715 print_block_info(pr);
1716 }
1717
1718 return 0;
1719 }
1720
1721 static int swapon_usage(void)
1722 {
1723 fprintf(stderr, "Usage: swapon [-s] [-a] [[-p pri] DEVICE]\n\n"
1724 "\tStart swapping on [DEVICE]\n"
1725 " -a\tStart swapping on all swap devices\n"
1726 " -p pri\tSet priority of swap device\n"
1727 " -s\tShow summary\n");
1728 return -1;
1729 }
1730
1731 static int main_swapon(int argc, char **argv)
1732 {
1733 int ch;
1734 FILE *fp;
1735 char *lineptr;
1736 size_t s;
1737 struct probe_info *pr;
1738 int flags = 0;
1739 int pri;
1740 struct stat st;
1741 int err;
1742
1743 while ((ch = getopt(argc, argv, "ap:s")) != -1) {
1744 switch(ch) {
1745 case 's':
1746 fp = fopen("/proc/swaps", "r");
1747 lineptr = NULL;
1748
1749 if (!fp) {
1750 ULOG_ERR("failed to open /proc/swaps\n");
1751 return -1;
1752 }
1753 while (getline(&lineptr, &s, fp) > 0)
1754 printf("%s", lineptr);
1755 if (lineptr)
1756 free(lineptr);
1757 fclose(fp);
1758 return 0;
1759 case 'a':
1760 cache_load(0);
1761 list_for_each_entry(pr, &devices, list) {
1762 if (strcmp(pr->type, "swap"))
1763 continue;
1764 if (swapon(pr->dev, 0))
1765 ULOG_ERR("failed to swapon %s\n", pr->dev);
1766 }
1767 return 0;
1768 case 'p':
1769 pri = atoi(optarg);
1770 if (pri >= 0)
1771 flags = ((pri << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
1772 break;
1773 default:
1774 return swapon_usage();
1775 }
1776 }
1777
1778 if (optind != (argc - 1))
1779 return swapon_usage();
1780
1781 if (stat(argv[optind], &st) || (!S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))) {
1782 ULOG_ERR("%s is not a block device or file\n", argv[optind]);
1783 return -1;
1784 }
1785 err = swapon(argv[optind], flags);
1786 if (err) {
1787 ULOG_ERR("failed to swapon %s (%d)\n", argv[optind], err);
1788 return err;
1789 }
1790
1791 return 0;
1792 }
1793
1794 static int main_swapoff(int argc, char **argv)
1795 {
1796 if (argc != 2) {
1797 ULOG_ERR("Usage: swapoff [-a] [DEVICE]\n\n"
1798 "\tStop swapping on DEVICE\n"
1799 " -a\tStop swapping on all swap devices\n");
1800 return -1;
1801 }
1802
1803 if (!strcmp(argv[1], "-a")) {
1804 FILE *fp = fopen("/proc/swaps", "r");
1805 char line[256];
1806
1807 if (!fp) {
1808 ULOG_ERR("failed to open /proc/swaps\n");
1809 return -1;
1810 }
1811 if (fgets(line, sizeof(line), fp))
1812 while (fgets(line, sizeof(line), fp)) {
1813 char *end = strchr(line, ' ');
1814 int err;
1815
1816 if (!end)
1817 continue;
1818 *end = '\0';
1819 err = swapoff(line);
1820 if (err)
1821 ULOG_ERR("failed to swapoff %s (%d)\n", line, err);
1822 }
1823 fclose(fp);
1824 } else {
1825 struct stat s;
1826 int err;
1827
1828 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1829 ULOG_ERR("%s is not a block device or file\n", argv[1]);
1830 return -1;
1831 }
1832 err = swapoff(argv[1]);
1833 if (err) {
1834 ULOG_ERR("failed to swapoff %s (%d)\n", argv[1], err);
1835 return err;
1836 }
1837 }
1838
1839 return 0;
1840 }
1841
1842 int main(int argc, char **argv)
1843 {
1844 char *base = basename(*argv);
1845
1846 umask(0);
1847
1848 ulog_open(-1, -1, "block");
1849 ulog_threshold(LOG_NOTICE);
1850
1851 if (!strcmp(base, "swapon"))
1852 return main_swapon(argc, argv);
1853
1854 if (!strcmp(base, "swapoff"))
1855 return main_swapoff(argc, argv);
1856
1857 if ((argc > 1) && !strcmp(base, "block")) {
1858 if (!strcmp(argv[1], "info"))
1859 return main_info(argc, argv);
1860
1861 if (!strcmp(argv[1], "detect"))
1862 return main_detect(argc, argv);
1863
1864 if (!strcmp(argv[1], "hotplug"))
1865 return main_hotplug(argc, argv);
1866
1867 if (!strcmp(argv[1], "autofs"))
1868 return main_autofs(argc, argv);
1869
1870 if (!strcmp(argv[1], "extroot"))
1871 return main_extroot(argc, argv);
1872
1873 if (!strcmp(argv[1], "mount"))
1874 return main_mount(argc, argv);
1875
1876 if (!strcmp(argv[1], "umount"))
1877 return main_umount(argc, argv);
1878
1879 if (!strcmp(argv[1], "remount")) {
1880 int ret = main_umount(argc, argv);
1881
1882 if (!ret)
1883 ret = main_mount(argc, argv);
1884 return ret;
1885 }
1886 }
1887
1888 ULOG_ERR("Usage: block <info|mount|umount|detect>\n");
1889
1890 return -1;
1891 }
OpenWrt filesystem utilities