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3773a6eb22e9ccecb3dd5d75265c7763c467c657
[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 bool mtdblock_is_nand(char *mtdnum)
485 {
486 char tmppath[64];
487 char buf[16];
488 FILE *fp;
489
490 snprintf(tmppath, sizeof(tmppath) - 1, "/sys/class/mtd/mtd%s/type", mtdnum);
491 fp = fopen(tmppath, "r");
492 if (!fp)
493 return false;
494
495 if (!fgets(buf, sizeof(buf), fp)) {
496 fclose(fp);
497 return false;
498 }
499 fclose(fp);
500 buf[sizeof(buf) - 1] = '\0'; /* make sure buf is 0-terminated */
501 buf[strlen(buf) - 1] = '\0'; /* strip final char (newline) */
502
503 if (strcmp(buf, "nand"))
504 return false;
505
506 /*
507 * --- CUT HERE ---
508 * Keep probing rootfs and rootfs_data in the meantime to not break
509 * devices using JFFS2 on NAND but only trigger the kernel warnings.
510 * Remove this once all devices using JFFS2 and squashfs directly on
511 * NAND have been converted to UBI.
512 */
513 snprintf(tmppath, sizeof(tmppath) - 1, "/sys/class/mtd/mtd%s/name", mtdnum);
514 fp = fopen(tmppath, "r");
515 if (!fp)
516 return false;
517
518 if (!fgets(buf, sizeof(buf), fp)) {
519 fclose(fp);
520 return false;
521 }
522 fclose(fp);
523 buf[sizeof(buf) - 1] = '\0'; /* make sure buf is 0-terminated */
524 buf[strlen(buf) - 1] = '\0'; /* strip final char (newline) */
525
526 /* only return true if name differs from 'rootfs' and 'rootfs_data' */
527 if (strcmp(buf, "rootfs") && strcmp(buf, "rootfs_data"))
528 return true;
529
530 /* --- CUT HERE --- */
531 return false;
532 }
533
534 static struct probe_info* _probe_path(char *path)
535 {
536 struct probe_info *pr, *epr;
537 char tmppath[64];
538
539 if (!strncmp(path, "/dev/mtdblock", 13) && mtdblock_is_nand(path + 13))
540 return NULL;
541
542 pr = probe_path(path);
543 if (!pr)
544 return NULL;
545
546 if (path[5] == 'u' && path[6] == 'b' && path[7] == 'i' &&
547 path[8] >= '0' && path[8] <= '9' ) {
548 /* skip ubi device if not UBIFS (as it requires ubiblock) */
549 if (strcmp("ubifs", pr->type))
550 return NULL;
551
552 /* skip ubi device if ubiblock device is present */
553 snprintf(tmppath, sizeof(tmppath), "/dev/ubiblock%s", path + 8);
554 list_for_each_entry(epr, &devices, list)
555 if (!strcmp(epr->dev, tmppath))
556 return NULL;
557 }
558
559 return pr;
560 }
561
562 static int _cache_load(const char *path)
563 {
564 int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
565 int j;
566 glob_t gl;
567
568 if (glob(path, gl_flags, NULL, &gl) < 0)
569 return -1;
570
571 for (j = 0; j < gl.gl_pathc; j++) {
572 struct probe_info *pr = _probe_path(gl.gl_pathv[j]);
573 if (pr)
574 list_add_tail(&pr->list, &devices);
575 }
576
577 globfree(&gl);
578
579 return 0;
580 }
581
582 static void cache_load(int mtd)
583 {
584 if (mtd) {
585 _cache_load("/dev/mtdblock*");
586 _cache_load("/dev/ubiblock*");
587 _cache_load("/dev/ubi[0-9]*");
588 }
589 _cache_load("/dev/loop*");
590 _cache_load("/dev/mmcblk*");
591 _cache_load("/dev/sd*");
592 _cache_load("/dev/hd*");
593 _cache_load("/dev/md*");
594 _cache_load("/dev/nvme*");
595 _cache_load("/dev/vd*");
596 _cache_load("/dev/xvd*");
597 _cache_load("/dev/dm-*");
598 }
599
600
601 static struct probe_info* find_block_info(char *uuid, char *label, char *path)
602 {
603 struct probe_info *pr = NULL;
604
605 if (uuid)
606 list_for_each_entry(pr, &devices, list)
607 if (pr->uuid && !strcasecmp(pr->uuid, uuid))
608 return pr;
609
610 if (label)
611 list_for_each_entry(pr, &devices, list)
612 if (pr->label && !strcmp(pr->label, label))
613 return pr;
614
615 if (path)
616 list_for_each_entry(pr, &devices, list)
617 if (pr->dev && !strcmp(basename(pr->dev), basename(path)))
618 return pr;
619
620 return NULL;
621 }
622
623 static char* find_mount_point(char *block)
624 {
625 FILE *fp = fopen("/proc/self/mountinfo", "r");
626 static char line[256];
627 char *point = NULL, *pos, *tmp, *cpoint, *devname;
628 struct stat s;
629 int rstat;
630 unsigned int minor, major;
631
632 if (!fp)
633 return NULL;
634
635 rstat = stat(block, &s);
636
637 while (fgets(line, sizeof(line), fp)) {
638 pos = strchr(line, ' ');
639 if (!pos)
640 continue;
641
642 pos = strchr(pos + 1, ' ');
643 if (!pos)
644 continue;
645
646 tmp = ++pos;
647 pos = strchr(pos, ':');
648 if (!pos)
649 continue;
650
651 *pos = '\0';
652 major = atoi(tmp);
653 tmp = ++pos;
654 pos = strchr(pos, ' ');
655 if (!pos)
656 continue;
657
658 *pos = '\0';
659 minor = atoi(tmp);
660 pos = strchr(pos + 1, ' ');
661 if (!pos)
662 continue;
663 tmp = ++pos;
664
665 pos = strchr(pos, ' ');
666 if (!pos)
667 continue;
668 *pos = '\0';
669 cpoint = tmp;
670
671 pos = strchr(pos + 1, ' ');
672 if (!pos)
673 continue;
674
675 pos = strchr(pos + 1, ' ');
676 if (!pos)
677 continue;
678
679 pos = strchr(pos + 1, ' ');
680 if (!pos)
681 continue;
682
683 tmp = ++pos;
684 pos = strchr(pos, ' ');
685 if (!pos)
686 continue;
687
688 *pos = '\0';
689 devname = tmp;
690 if (!strcmp(block, devname)) {
691 point = strdup(cpoint);
692 break;
693 }
694
695 if (rstat)
696 continue;
697
698 if (!S_ISBLK(s.st_mode))
699 continue;
700
701 if (major == major(s.st_rdev) &&
702 minor == minor(s.st_rdev)) {
703 point = strdup(cpoint);
704 break;
705 }
706 }
707
708 fclose(fp);
709
710 return point;
711 }
712
713 static int print_block_uci(struct probe_info *pr)
714 {
715 if (!strcmp(pr->type, "swap")) {
716 printf("config 'swap'\n");
717 } else {
718 char *mp = find_mount_point(pr->dev);
719
720 printf("config 'mount'\n");
721 if (mp) {
722 printf("\toption\ttarget\t'%s'\n", mp);
723 free(mp);
724 } else {
725 printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev));
726 }
727 }
728 if (pr->uuid)
729 printf("\toption\tuuid\t'%s'\n", pr->uuid);
730 else
731 printf("\toption\tdevice\t'%s'\n", pr->dev);
732 printf("\toption\tenabled\t'0'\n\n");
733
734 return 0;
735 }
736
737 static int print_block_info(struct probe_info *pr)
738 {
739 static char *mp;
740
741 mp = find_mount_point(pr->dev);
742 printf("%s:", pr->dev);
743 if (pr->uuid)
744 printf(" UUID=\"%s\"", pr->uuid);
745
746 if (pr->label)
747 printf(" LABEL=\"%s\"", pr->label);
748
749 if (pr->version)
750 printf(" VERSION=\"%s\"", pr->version);
751
752 if (mp) {
753 printf(" MOUNT=\"%s\"", mp);
754 free(mp);
755 }
756
757 printf(" TYPE=\"%s\"\n", pr->type);
758
759 return 0;
760 }
761
762 static void check_filesystem(struct probe_info *pr)
763 {
764 pid_t pid;
765 struct stat statbuf;
766 const char *e2fsck = "/usr/sbin/e2fsck";
767 const char *f2fsck = "/usr/sbin/fsck.f2fs";
768 const char *fatfsck = "/usr/sbin/fsck.fat";
769 const char *btrfsck = "/usr/bin/btrfsck";
770 const char *ntfsck = "/usr/bin/ntfsfix";
771 const char *ckfs;
772
773 /* UBIFS does not need stuff like fsck */
774 if (!strncmp(pr->type, "ubifs", 5))
775 return;
776
777 if (!strncmp(pr->type, "vfat", 4)) {
778 ckfs = fatfsck;
779 } else if (!strncmp(pr->type, "f2fs", 4)) {
780 ckfs = f2fsck;
781 } else if (!strncmp(pr->type, "ext", 3)) {
782 ckfs = e2fsck;
783 } else if (!strncmp(pr->type, "btrfs", 5)) {
784 ckfs = btrfsck;
785 } else if (!strncmp(pr->type, "ntfs", 4)) {
786 ckfs = ntfsck;
787 } else {
788 ULOG_ERR("check_filesystem: %s is not supported\n", pr->type);
789 return;
790 }
791
792 if (stat(ckfs, &statbuf) < 0) {
793 ULOG_ERR("check_filesystem: %s not found\n", ckfs);
794 return;
795 }
796
797 pid = fork();
798 if (!pid) {
799 if(!strncmp(pr->type, "f2fs", 4)) {
800 execl(ckfs, ckfs, "-f", pr->dev, NULL);
801 exit(EXIT_FAILURE);
802 } else if(!strncmp(pr->type, "btrfs", 5)) {
803 execl(ckfs, ckfs, "--repair", pr->dev, NULL);
804 exit(EXIT_FAILURE);
805 } else if(!strncmp(pr->type, "ntfs", 4)) {
806 execl(ckfs, ckfs, "-b", pr->dev, NULL);
807 exit(EXIT_FAILURE);
808 } else {
809 execl(ckfs, ckfs, "-p", pr->dev, NULL);
810 exit(EXIT_FAILURE);
811 }
812 } else if (pid > 0) {
813 int status;
814
815 waitpid(pid, &status, 0);
816 if (WIFEXITED(status) && WEXITSTATUS(status))
817 ULOG_ERR("check_filesystem: %s returned %d\n", ckfs, WEXITSTATUS(status));
818 if (WIFSIGNALED(status))
819 ULOG_ERR("check_filesystem: %s terminated by %s\n", ckfs, strsignal(WTERMSIG(status)));
820 }
821 }
822
823 static void handle_swapfiles(bool on)
824 {
825 struct stat s;
826 struct mount *m;
827 struct probe_info *pr;
828
829 vlist_for_each_element(&mounts, m, node)
830 {
831 if (m->type != TYPE_SWAP || !m->target)
832 continue;
833
834 if (stat(m->target, &s) || !S_ISREG(s.st_mode))
835 continue;
836
837 pr = _probe_path(m->target);
838
839 if (!pr)
840 continue;
841
842 if (!strcmp(pr->type, "swap")) {
843 if (on)
844 swapon(pr->dev, m->prio);
845 else
846 swapoff(pr->dev);
847 }
848
849 free(pr);
850 }
851 }
852
853 static void to_devnull(int fd)
854 {
855 int devnull = open("/dev/null", fd ? O_WRONLY : O_RDONLY);
856
857 if (devnull >= 0)
858 dup2(devnull, fd);
859
860 if (devnull > STDERR_FILENO)
861 close(devnull);
862 }
863
864 static int exec_mount(const char *source, const char *target,
865 const char *fstype, const char *options)
866 {
867 pid_t pid;
868 struct stat s;
869 FILE *mount_fd;
870 int err, status, pfds[2];
871 char errmsg[128], cmd[sizeof("/sbin/mount.XXXXXXXXXXXXXXXX\0")];
872
873 snprintf(cmd, sizeof(cmd), "/sbin/mount.%s", fstype);
874
875 if (stat(cmd, &s) < 0 || !S_ISREG(s.st_mode) || !(s.st_mode & S_IXUSR)) {
876 ULOG_ERR("No \"mount.%s\" utility available\n", fstype);
877 return -1;
878 }
879
880 if (pipe(pfds) < 0)
881 return -1;
882
883 fcntl(pfds[0], F_SETFD, fcntl(pfds[0], F_GETFD) | FD_CLOEXEC);
884 fcntl(pfds[1], F_SETFD, fcntl(pfds[1], F_GETFD) | FD_CLOEXEC);
885
886 pid = vfork();
887
888 switch (pid) {
889 case -1:
890 close(pfds[0]);
891 close(pfds[1]);
892
893 return -1;
894
895 case 0:
896 to_devnull(STDIN_FILENO);
897 to_devnull(STDOUT_FILENO);
898
899 dup2(pfds[1], STDERR_FILENO);
900 close(pfds[0]);
901 close(pfds[1]);
902
903 if (options && *options)
904 execl(cmd, cmd, "-o", options, source, target, NULL);
905 else
906 execl(cmd, cmd, source, target, NULL);
907
908 return -1;
909
910 default:
911 close(pfds[1]);
912
913 mount_fd = fdopen(pfds[0], "r");
914
915 while (fgets(errmsg, sizeof(errmsg), mount_fd))
916 ULOG_ERR("mount.%s: %s", fstype, errmsg);
917
918 fclose(mount_fd);
919
920 err = waitpid(pid, &status, 0);
921
922 if (err != -1) {
923 if (status != 0) {
924 ULOG_ERR("mount.%s: failed with status %d\n", fstype, status);
925 errno = EINVAL;
926 err = -1;
927 } else {
928 errno = 0;
929 err = 0;
930 }
931 }
932
933 break;
934 }
935
936 return err;
937 }
938
939 static int handle_mount(const char *source, const char *target,
940 const char *fstype, struct mount *m)
941 {
942 int i, err;
943 size_t mount_opts_len;
944 char *mount_opts = NULL, *ptr;
945
946 err = mount(source, target, fstype, m ? m->flags : 0,
947 (m && m->options) ? m->options : "");
948
949 /* Requested file system type is not available in kernel,
950 attempt to call mount helper. */
951 if (err == -1 && errno == ENODEV) {
952 if (m) {
953 /* Convert mount flags back into string representation,
954 first calculate needed length of string buffer... */
955 mount_opts_len = 1 + (m->options ? strlen(m->options) : 0);
956
957 for (i = 0; i < ARRAY_SIZE(mount_flags); i++)
958 if ((mount_flags[i].flag > 0) &&
959 (mount_flags[i].flag < INT_MAX) &&
960 (m->flags & (uint32_t)mount_flags[i].flag))
961 mount_opts_len += strlen(mount_flags[i].name) + 1;
962
963 /* ... then now allocate and fill it ... */
964 ptr = mount_opts = calloc(1, mount_opts_len);
965
966 if (!ptr) {
967 errno = ENOMEM;
968 return -1;
969 }
970
971 if (m->options)
972 ptr += sprintf(ptr, "%s,", m->options);
973
974 for (i = 0; i < ARRAY_SIZE(mount_flags); i++)
975 if ((mount_flags[i].flag > 0) &&
976 (mount_flags[i].flag < INT_MAX) &&
977 (m->flags & (uint32_t)mount_flags[i].flag))
978 ptr += sprintf(ptr, "%s,", mount_flags[i].name);
979
980 mount_opts[mount_opts_len - 1] = 0;
981 }
982
983 /* ... and now finally invoke the external mount program */
984 err = exec_mount(source, target, fstype, mount_opts);
985 }
986
987 free(mount_opts);
988
989 return err;
990 }
991
992 static int blockd_notify(const char *method, char *device, struct mount *m,
993 struct probe_info *pr)
994 {
995 struct ubus_context *ctx = ubus_connect(NULL);
996 uint32_t id;
997 int err;
998
999 if (!ctx)
1000 return -ENXIO;
1001
1002 if (!ubus_lookup_id(ctx, "block", &id)) {
1003 struct blob_buf buf = { 0 };
1004 char *d = strrchr(device, '/');
1005
1006 if (d)
1007 d++;
1008 else
1009 d = device;
1010
1011 blob_buf_init(&buf, 0);
1012
1013 if (m) {
1014
1015 blobmsg_add_string(&buf, "device", d);
1016 if (m->uuid)
1017 blobmsg_add_string(&buf, "uuid", m->uuid);
1018 if (m->label)
1019 blobmsg_add_string(&buf, "label", m->label);
1020 if (m->target)
1021 blobmsg_add_string(&buf, "target", m->target);
1022 if (m->options)
1023 blobmsg_add_string(&buf, "options", m->options);
1024 if (m->autofs)
1025 blobmsg_add_u32(&buf, "autofs", m->autofs);
1026 if (pr->type)
1027 blobmsg_add_string(&buf, "type", pr->type);
1028 if (pr->version)
1029 blobmsg_add_string(&buf, "version", pr->version);
1030 } else if (pr) {
1031 blobmsg_add_string(&buf, "device", d);
1032 if (pr->uuid)
1033 blobmsg_add_string(&buf, "uuid", pr->uuid);
1034 if (pr->label)
1035 blobmsg_add_string(&buf, "label", pr->label);
1036 if (pr->type)
1037 blobmsg_add_string(&buf, "type", pr->type);
1038 if (pr->version)
1039 blobmsg_add_string(&buf, "version", pr->version);
1040 blobmsg_add_u32(&buf, "anon", 1);
1041 } else {
1042 blobmsg_add_string(&buf, "device", d);
1043 blobmsg_add_u32(&buf, "remove", 1);
1044 }
1045
1046 err = ubus_invoke(ctx, id, method, buf.head, NULL, NULL, 3000);
1047 } else {
1048 err = -ENOENT;
1049 }
1050
1051 ubus_free(ctx);
1052
1053 return err;
1054 }
1055
1056 static int mount_device(struct probe_info *pr, int type)
1057 {
1058 struct mount *m;
1059 struct stat st;
1060 char *_target = NULL;
1061 char *target;
1062 char *device;
1063 char *mp;
1064 int err;
1065
1066 if (!pr)
1067 return -1;
1068
1069 device = basename(pr->dev);
1070
1071 if (!strcmp(pr->type, "swap")) {
1072 if ((type == TYPE_HOTPLUG) && !auto_swap)
1073 return -1;
1074 m = find_swap(pr->uuid, pr->label, device);
1075 if (m || anon_swap)
1076 swapon(pr->dev, (m) ? (m->prio) : (0));
1077
1078 return 0;
1079 }
1080
1081 m = find_block(pr->uuid, pr->label, device, NULL);
1082 if (m && m->extroot)
1083 return -1;
1084
1085 mp = find_mount_point(pr->dev);
1086 if (mp) {
1087 if (m && m->type == TYPE_MOUNT && m->target && strcmp(m->target, mp)) {
1088 ULOG_ERR("%s is already mounted on %s\n", pr->dev, mp);
1089 err = -1;
1090 } else
1091 err = 0;
1092 free(mp);
1093 return err;
1094 }
1095
1096 if (type == TYPE_HOTPLUG)
1097 blockd_notify("hotplug", device, m, pr);
1098
1099 /* Check if device should be mounted & set the target directory */
1100 if (m) {
1101 switch (type) {
1102 case TYPE_HOTPLUG:
1103 if (m->autofs)
1104 return 0;
1105 if (!auto_mount)
1106 return -1;
1107 break;
1108 case TYPE_AUTOFS:
1109 if (!m->autofs)
1110 return -1;
1111 break;
1112 case TYPE_DEV:
1113 if (m->autofs)
1114 return -1;
1115 break;
1116 }
1117
1118 if (m->autofs) {
1119 if (asprintf(&_target, "/tmp/run/blockd/%s", device) == -1)
1120 exit(ENOMEM);
1121
1122 target = _target;
1123 } else if (m->target) {
1124 target = m->target;
1125 } else {
1126 if (asprintf(&_target, "/mnt/%s", device) == -1)
1127 exit(ENOMEM);
1128
1129 target = _target;
1130 }
1131 } else if (anon_mount) {
1132 if (asprintf(&_target, "/mnt/%s", device) == -1)
1133 exit(ENOMEM);
1134
1135 target = _target;
1136 } else {
1137 /* No reason to mount this device */
1138 return 0;
1139 }
1140
1141 /* Mount the device */
1142
1143 if (check_fs)
1144 check_filesystem(pr);
1145
1146 mkdir_p(target, 0755);
1147 if (!lstat(target, &st) && S_ISLNK(st.st_mode))
1148 unlink(target);
1149
1150 err = handle_mount(pr->dev, target, pr->type, m);
1151 if (err) {
1152 ULOG_ERR("mounting %s (%s) as %s failed (%d) - %m\n",
1153 pr->dev, pr->type, target, errno);
1154
1155 if (_target)
1156 free(_target);
1157
1158 return err;
1159 }
1160
1161 if (_target)
1162 free(_target);
1163
1164 handle_swapfiles(true);
1165
1166 if (type != TYPE_AUTOFS)
1167 blockd_notify("mount", device, NULL, NULL);
1168
1169 return 0;
1170 }
1171
1172 static int umount_device(char *path, int type, bool all)
1173 {
1174 char *mp, *devpath;
1175 int err;
1176
1177 if (strlen(path) > 5 && !strncmp("/dev/", path, 5)) {
1178 mp = find_mount_point(path);
1179 } else {
1180 devpath = malloc(strlen(path) + 6);
1181 strcpy(devpath, "/dev/");
1182 strcat(devpath, path);
1183 mp = find_mount_point(devpath);
1184 free(devpath);
1185 }
1186
1187 if (!mp)
1188 return -1;
1189 if (!strcmp(mp, "/") && !all) {
1190 free(mp);
1191 return 0;
1192 }
1193 if (type != TYPE_AUTOFS)
1194 blockd_notify("umount", basename(path), NULL, NULL);
1195
1196 err = umount2(mp, MNT_DETACH);
1197 if (err) {
1198 ULOG_ERR("unmounting %s (%s) failed (%d) - %m\n", path, mp,
1199 errno);
1200 } else {
1201 ULOG_INFO("unmounted %s (%s)\n", path, mp);
1202 rmdir(mp);
1203 }
1204
1205 free(mp);
1206 return err;
1207 }
1208
1209 static int mount_action(char *action, char *device, int type)
1210 {
1211 char *path = NULL;
1212 struct probe_info *pr;
1213
1214 if (!action || !device)
1215 return -1;
1216
1217 if (!strcmp(action, "remove")) {
1218 if (type == TYPE_HOTPLUG)
1219 blockd_notify("hotplug", device, NULL, NULL);
1220
1221 umount_device(device, type, true);
1222
1223 return 0;
1224 } else if (strcmp(action, "add")) {
1225 ULOG_ERR("Unkown action %s\n", action);
1226
1227 return -1;
1228 }
1229
1230 if (config_load(NULL))
1231 return -1;
1232
1233 cache_load(1);
1234
1235 list_for_each_entry(pr, &devices, list)
1236 if (!strcmp(basename(pr->dev), device))
1237 path = pr->dev;
1238
1239 if (!path)
1240 return -1;
1241
1242 return mount_device(find_block_info(NULL, NULL, path), type);
1243 }
1244
1245 static int main_hotplug(int argc, char **argv)
1246 {
1247 return mount_action(getenv("ACTION"), getenv("DEVNAME"), TYPE_HOTPLUG);
1248 }
1249
1250 static int main_autofs(int argc, char **argv)
1251 {
1252 int err = 0;
1253
1254 if (argc < 3)
1255 return -1;
1256
1257 if (!strcmp(argv[2], "start")) {
1258 struct probe_info *pr;
1259
1260 if (config_load(NULL))
1261 return -1;
1262
1263 cache_load(1);
1264 list_for_each_entry(pr, &devices, list) {
1265 struct mount *m;
1266 char *mp;
1267
1268 if (!strcmp(pr->type, "swap"))
1269 continue;
1270
1271 m = find_block(pr->uuid, pr->label, NULL, NULL);
1272 if (m && m->extroot)
1273 continue;
1274
1275 blockd_notify("hotplug", pr->dev, m, pr);
1276 if ((!m || !m->autofs) && (mp = find_mount_point(pr->dev))) {
1277 blockd_notify("mount", pr->dev, NULL, NULL);
1278 free(mp);
1279 }
1280 }
1281 } else {
1282 if (argc < 4)
1283 return -EINVAL;
1284
1285 err = mount_action(argv[2], argv[3], TYPE_AUTOFS);
1286 }
1287
1288 if (err) {
1289 ULOG_ERR("autofs: \"%s\" action has failed: %d\n", argv[2], err);
1290 }
1291
1292 return err;
1293 }
1294
1295 static int find_block_mtd(char *name, char *part, int plen)
1296 {
1297 FILE *fp = fopen("/proc/mtd", "r");
1298 static char line[256];
1299 char *index = NULL;
1300
1301 if(!fp)
1302 return -1;
1303
1304 while (!index && fgets(line, sizeof(line), fp)) {
1305 if (strstr(line, name)) {
1306 char *eol = strstr(line, ":");
1307
1308 if (!eol)
1309 continue;
1310
1311 *eol = '\0';
1312 index = &line[3];
1313 }
1314 }
1315
1316 fclose(fp);
1317
1318 if (!index)
1319 return -1;
1320
1321 snprintf(part, plen, "/dev/mtdblock%s", index);
1322
1323 return 0;
1324 }
1325
1326 #ifdef UBIFS_EXTROOT
1327 static int find_ubi_vol(libubi_t libubi, char *name, int *dev_num, int *vol_id)
1328 {
1329 int dev = 0;
1330
1331 while (ubi_dev_present(libubi, dev))
1332 {
1333 struct ubi_dev_info dev_info;
1334 struct ubi_vol_info vol_info;
1335
1336 if (ubi_get_dev_info1(libubi, dev++, &dev_info))
1337 continue;
1338 if (ubi_get_vol_info1_nm(libubi, dev_info.dev_num, name, &vol_info))
1339 continue;
1340
1341 *dev_num = dev_info.dev_num;
1342 *vol_id = vol_info.vol_id;
1343
1344 return 0;
1345 }
1346
1347 return -1;
1348 }
1349
1350 static int find_block_ubi(libubi_t libubi, char *name, char *part, int plen)
1351 {
1352 int dev_num;
1353 int vol_id;
1354 int err = -1;
1355
1356 err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
1357 if (!err)
1358 snprintf(part, plen, "/dev/ubi%d_%d", dev_num, vol_id);
1359
1360 return err;
1361 }
1362
1363 static int find_block_ubi_RO(libubi_t libubi, char *name, char *part, int plen)
1364 {
1365 int dev_num;
1366 int vol_id;
1367 int err = -1;
1368
1369 err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
1370 if (!err)
1371 snprintf(part, plen, "/dev/ubiblock%d_%d", dev_num, vol_id);
1372
1373 return err;
1374 }
1375 #endif
1376
1377 static int find_root_dev(char *buf, int len)
1378 {
1379 DIR *d;
1380 dev_t root;
1381 struct stat s;
1382 struct dirent *e;
1383
1384 if (stat("/", &s))
1385 return -1;
1386
1387 if (!(d = opendir("/dev")))
1388 return -1;
1389
1390 root = s.st_dev;
1391
1392 while ((e = readdir(d)) != NULL) {
1393 snprintf(buf, len, "/dev/%s", e->d_name);
1394
1395 if (stat(buf, &s) || s.st_rdev != root)
1396 continue;
1397
1398 closedir(d);
1399 return 0;
1400 }
1401
1402 closedir(d);
1403 return -1;
1404 }
1405
1406 static int test_fs_support(const char *name)
1407 {
1408 char line[128], *p;
1409 int rv = -1;
1410 FILE *f;
1411
1412 if ((f = fopen("/proc/filesystems", "r")) != NULL) {
1413 while (fgets(line, sizeof(line), f)) {
1414 p = strtok(line, "\t\n");
1415
1416 if (p && !strcmp(p, "nodev"))
1417 p = strtok(NULL, "\t\n");
1418
1419 if (p && !strcmp(p, name)) {
1420 rv = 0;
1421 break;
1422 }
1423 }
1424 fclose(f);
1425 }
1426
1427 return rv;
1428 }
1429
1430 /**
1431 * Check if mounted partition is a valid extroot
1432 *
1433 * @path target mount point
1434 *
1435 * Valid extroot partition has to contain /etc/.extroot-uuid with UUID of root
1436 * device. This function reads UUID and verifies it OR writes UUID to
1437 * .extroot-uuid if it doesn't exist yet (first extroot usage).
1438 */
1439 static int check_extroot(char *path)
1440 {
1441 struct probe_info *pr = NULL;
1442 struct probe_info *tmp;
1443 struct stat s;
1444 char uuid[64] = { 0 };
1445 char devpath[32];
1446 char tag[64];
1447 FILE *fp;
1448 int err;
1449
1450 err = find_block_mtd("\"rootfs\"", devpath, sizeof(devpath));
1451 #ifdef UBIFS_EXTROOT
1452 if (err) {
1453 libubi_t libubi;
1454
1455 libubi = libubi_open();
1456 err = find_block_ubi_RO(libubi, "rootfs", devpath, sizeof(devpath));
1457 libubi_close(libubi);
1458 }
1459 #endif
1460 if (err) {
1461 err = find_root_dev(devpath, sizeof(devpath));
1462 }
1463 if (err) {
1464 ULOG_ERR("extroot: unable to determine root device\n");
1465 return -1;
1466 }
1467
1468 /* Find root device probe_info so we know its UUID */
1469 list_for_each_entry(tmp, &devices, list) {
1470 if (!strcmp(tmp->dev, devpath)) {
1471 pr = tmp;
1472 break;
1473 }
1474 }
1475 if (!pr) {
1476 ULOG_ERR("extroot: unable to lookup root device %s\n", devpath);
1477 return -1;
1478 }
1479
1480 snprintf(tag, sizeof(tag), "%s/etc", path);
1481 if (stat(tag, &s))
1482 mkdir_p(tag, 0755);
1483
1484 snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
1485 if (stat(tag, &s)) {
1486 fp = fopen(tag, "w+");
1487 if (!fp) {
1488 ULOG_ERR("extroot: failed to write UUID to %s: %d (%m)\n",
1489 tag, errno);
1490 /* return 0 to continue boot regardless of error */
1491 return 0;
1492 }
1493 fputs(pr->uuid, fp);
1494 fclose(fp);
1495 return 0;
1496 }
1497
1498 fp = fopen(tag, "r");
1499 if (!fp) {
1500 ULOG_ERR("extroot: failed to read UUID from %s: %d (%m)\n", tag,
1501 errno);
1502 return -1;
1503 }
1504
1505 if (!fgets(uuid, sizeof(uuid), fp))
1506 ULOG_ERR("extroot: failed to read UUID from %s: %d (%m)\n", tag,
1507 errno);
1508 fclose(fp);
1509
1510 if (*uuid && !strcasecmp(uuid, pr->uuid))
1511 return 0;
1512
1513 ULOG_ERR("extroot: UUID mismatch (root: %s, %s: %s)\n", pr->uuid,
1514 basename(path), uuid);
1515 return -1;
1516 }
1517
1518 /*
1519 * Read info about extroot from UCI (using prefix) and mount it.
1520 */
1521 static int mount_extroot(char *cfg)
1522 {
1523 char overlay[] = "/tmp/extroot/overlay";
1524 char mnt[] = "/tmp/extroot/mnt";
1525 char *path = mnt;
1526 struct probe_info *pr;
1527 struct mount *m;
1528 int err = -1;
1529
1530 /* Load @cfg/etc/config/fstab */
1531 if (config_load(cfg))
1532 return -2;
1533
1534 /* See if there is extroot-specific mount config */
1535 m = find_block(NULL, NULL, NULL, "/");
1536 if (!m)
1537 m = find_block(NULL, NULL, NULL, "/overlay");
1538
1539 if (!m || !m->extroot)
1540 {
1541 ULOG_INFO("extroot: not configured\n");
1542 return -1;
1543 }
1544
1545 /* Find block device pointed by the mount config */
1546 pr = find_block_info(m->uuid, m->label, m->device);
1547
1548 if (!pr && delay_root){
1549 ULOG_INFO("extroot: device not present, retrying in %u seconds\n", delay_root);
1550 sleep(delay_root);
1551 make_devs();
1552 cache_load(1);
1553 pr = find_block_info(m->uuid, m->label, m->device);
1554 }
1555 if (pr) {
1556 if (strncmp(pr->type, "ext", 3) &&
1557 strncmp(pr->type, "f2fs", 4) &&
1558 strncmp(pr->type, "btrfs", 5) &&
1559 strncmp(pr->type, "ntfs", 4) &&
1560 strncmp(pr->type, "ubifs", 5)) {
1561 ULOG_ERR("extroot: unsupported filesystem %s, try ext4, f2fs, btrfs, ntfs or ubifs\n", pr->type);
1562 return -1;
1563 }
1564
1565 if (test_fs_support(pr->type)) {
1566 ULOG_ERR("extroot: filesystem %s not supported by kernel\n", pr->type);
1567 return -1;
1568 }
1569
1570 if (m->overlay)
1571 path = overlay;
1572 mkdir_p(path, 0755);
1573
1574 if (check_fs)
1575 check_filesystem(pr);
1576
1577 err = mount(pr->dev, path, pr->type, m->flags,
1578 (m->options) ? (m->options) : (""));
1579
1580 if (err) {
1581 ULOG_ERR("extroot: mounting %s (%s) on %s failed: %d (%m)\n",
1582 pr->dev, pr->type, path, errno);
1583 } else if (m->overlay) {
1584 err = check_extroot(path);
1585 if (err)
1586 umount(path);
1587 }
1588 } else {
1589 ULOG_ERR("extroot: cannot find device %s%s\n",
1590 (m->uuid ? "with UUID " : (m->label ? "with label " : "")),
1591 (m->uuid ? m->uuid : (m->label ? m->label : m->device)));
1592 }
1593
1594 return err;
1595 }
1596
1597 /**
1598 * Look for extroot config and mount it if present
1599 *
1600 * Look for /etc/config/fstab on all supported partitions and use it for
1601 * mounting extroot if specified.
1602 */
1603 static int main_extroot(int argc, char **argv)
1604 {
1605 struct probe_info *pr;
1606 char blkdev_path[32] = { 0 };
1607 int err = -1;
1608 #ifdef UBIFS_EXTROOT
1609 libubi_t libubi;
1610 #endif
1611
1612 if (!getenv("PREINIT"))
1613 return -1;
1614
1615 if (argc != 2) {
1616 ULOG_ERR("Usage: block extroot\n");
1617 return -1;
1618 }
1619
1620 make_devs();
1621 cache_load(1);
1622
1623 /* enable LOG_INFO messages */
1624 ulog_threshold(LOG_INFO);
1625
1626 /*
1627 * Look for "rootfs_data". We will want to mount it and check for
1628 * extroot configuration.
1629 */
1630
1631 /* Start with looking for MTD partition */
1632 find_block_mtd("\"rootfs_data\"", blkdev_path, sizeof(blkdev_path));
1633 if (blkdev_path[0]) {
1634 pr = find_block_info(NULL, NULL, blkdev_path);
1635 if (pr && !strcmp(pr->type, "jffs2")) {
1636 char cfg[] = "/tmp/jffs_cfg";
1637
1638 /*
1639 * Mount MTD part and try extroot (using
1640 * /etc/config/fstab from that partition)
1641 */
1642 mkdir_p(cfg, 0755);
1643 if (!mount(blkdev_path, cfg, "jffs2", MS_NOATIME, NULL)) {
1644 err = mount_extroot(cfg);
1645 umount2(cfg, MNT_DETACH);
1646 }
1647 if (err < 0)
1648 rmdir("/tmp/overlay");
1649 rmdir(cfg);
1650 return err;
1651 }
1652 }
1653
1654 #ifdef UBIFS_EXTROOT
1655 /* ... but it also could be an UBI volume */
1656 memset(blkdev_path, 0, sizeof(blkdev_path));
1657 libubi = libubi_open();
1658 find_block_ubi(libubi, "rootfs_data", blkdev_path, sizeof(blkdev_path));
1659 libubi_close(libubi);
1660 if (blkdev_path[0]) {
1661 char cfg[] = "/tmp/ubifs_cfg";
1662
1663 /* Mount volume and try extroot (using fstab from that vol) */
1664 mkdir_p(cfg, 0755);
1665 if (!mount(blkdev_path, cfg, "ubifs", MS_NOATIME, NULL)) {
1666 err = mount_extroot(cfg);
1667 umount2(cfg, MNT_DETACH);
1668 }
1669 if (err < 0)
1670 rmdir("/tmp/overlay");
1671 rmdir(cfg);
1672 return err;
1673 }
1674 #endif
1675
1676 /* As a last resort look for /etc/config/fstab on "rootfs" partition */
1677 return mount_extroot(NULL);
1678 }
1679
1680 static int main_mount(int argc, char **argv)
1681 {
1682 struct probe_info *pr;
1683
1684 if (config_load(NULL))
1685 return -1;
1686
1687 cache_load(1);
1688 list_for_each_entry(pr, &devices, list)
1689 mount_device(pr, TYPE_DEV);
1690
1691 handle_swapfiles(true);
1692
1693 return 0;
1694 }
1695
1696 static int main_umount(int argc, char **argv)
1697 {
1698 struct probe_info *pr;
1699 bool all = false;
1700
1701 if (config_load(NULL))
1702 return -1;
1703
1704 handle_swapfiles(false);
1705
1706 cache_load(1);
1707
1708 if (argc == 3)
1709 all = !strcmp(argv[2], "-a");
1710
1711 list_for_each_entry(pr, &devices, list) {
1712 struct mount *m;
1713
1714 if (!strcmp(pr->type, "swap"))
1715 continue;
1716
1717 m = find_block(pr->uuid, pr->label, basename(pr->dev), NULL);
1718 if (m && m->extroot)
1719 continue;
1720
1721 umount_device(pr->dev, TYPE_DEV, all);
1722 }
1723
1724 return 0;
1725 }
1726
1727 static int main_detect(int argc, char **argv)
1728 {
1729 struct probe_info *pr;
1730
1731 cache_load(0);
1732 printf("config 'global'\n");
1733 printf("\toption\tanon_swap\t'0'\n");
1734 printf("\toption\tanon_mount\t'0'\n");
1735 printf("\toption\tauto_swap\t'1'\n");
1736 printf("\toption\tauto_mount\t'1'\n");
1737 printf("\toption\tdelay_root\t'5'\n");
1738 printf("\toption\tcheck_fs\t'0'\n\n");
1739 list_for_each_entry(pr, &devices, list)
1740 print_block_uci(pr);
1741
1742 return 0;
1743 }
1744
1745 static int main_info(int argc, char **argv)
1746 {
1747 int i;
1748 struct probe_info *pr;
1749
1750 cache_load(1);
1751 if (argc == 2) {
1752 list_for_each_entry(pr, &devices, list)
1753 print_block_info(pr);
1754
1755 return 0;
1756 };
1757
1758 for (i = 2; i < argc; i++) {
1759 struct stat s;
1760
1761 if (stat(argv[i], &s)) {
1762 ULOG_ERR("failed to stat %s\n", argv[i]);
1763 continue;
1764 }
1765 if (!S_ISBLK(s.st_mode) && !(S_ISCHR(s.st_mode) && major(s.st_rdev) == 250)) {
1766 ULOG_ERR("%s is not a block device\n", argv[i]);
1767 continue;
1768 }
1769 pr = find_block_info(NULL, NULL, argv[i]);
1770 if (pr)
1771 print_block_info(pr);
1772 }
1773
1774 return 0;
1775 }
1776
1777 static int swapon_usage(void)
1778 {
1779 fprintf(stderr, "Usage: swapon [-s] [-a] [[-p pri] DEVICE]\n\n"
1780 "\tStart swapping on [DEVICE]\n"
1781 " -a\tStart swapping on all swap devices\n"
1782 " -p pri\tSet priority of swap device\n"
1783 " -s\tShow summary\n");
1784 return -1;
1785 }
1786
1787 static int main_swapon(int argc, char **argv)
1788 {
1789 int ch;
1790 FILE *fp;
1791 char *lineptr;
1792 size_t s;
1793 struct probe_info *pr;
1794 int flags = 0;
1795 int pri;
1796 struct stat st;
1797 int err;
1798
1799 while ((ch = getopt(argc, argv, "ap:s")) != -1) {
1800 switch(ch) {
1801 case 's':
1802 fp = fopen("/proc/swaps", "r");
1803 lineptr = NULL;
1804
1805 if (!fp) {
1806 ULOG_ERR("failed to open /proc/swaps\n");
1807 return -1;
1808 }
1809 while (getline(&lineptr, &s, fp) > 0)
1810 printf("%s", lineptr);
1811 if (lineptr)
1812 free(lineptr);
1813 fclose(fp);
1814 return 0;
1815 case 'a':
1816 cache_load(0);
1817 list_for_each_entry(pr, &devices, list) {
1818 if (strcmp(pr->type, "swap"))
1819 continue;
1820 if (swapon(pr->dev, 0))
1821 ULOG_ERR("failed to swapon %s\n", pr->dev);
1822 }
1823 return 0;
1824 case 'p':
1825 pri = atoi(optarg);
1826 if (pri >= 0)
1827 flags = ((pri << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
1828 break;
1829 default:
1830 return swapon_usage();
1831 }
1832 }
1833
1834 if (optind != (argc - 1))
1835 return swapon_usage();
1836
1837 if (stat(argv[optind], &st) || (!S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))) {
1838 ULOG_ERR("%s is not a block device or file\n", argv[optind]);
1839 return -1;
1840 }
1841 err = swapon(argv[optind], flags);
1842 if (err) {
1843 ULOG_ERR("failed to swapon %s (%d)\n", argv[optind], err);
1844 return err;
1845 }
1846
1847 return 0;
1848 }
1849
1850 static int main_swapoff(int argc, char **argv)
1851 {
1852 if (argc != 2) {
1853 ULOG_ERR("Usage: swapoff [-a] [DEVICE]\n\n"
1854 "\tStop swapping on DEVICE\n"
1855 " -a\tStop swapping on all swap devices\n");
1856 return -1;
1857 }
1858
1859 if (!strcmp(argv[1], "-a")) {
1860 FILE *fp = fopen("/proc/swaps", "r");
1861 char line[256];
1862
1863 if (!fp) {
1864 ULOG_ERR("failed to open /proc/swaps\n");
1865 return -1;
1866 }
1867 if (fgets(line, sizeof(line), fp))
1868 while (fgets(line, sizeof(line), fp)) {
1869 char *end = strchr(line, ' ');
1870 int err;
1871
1872 if (!end)
1873 continue;
1874 *end = '\0';
1875 err = swapoff(line);
1876 if (err)
1877 ULOG_ERR("failed to swapoff %s (%d)\n", line, err);
1878 }
1879 fclose(fp);
1880 } else {
1881 struct stat s;
1882 int err;
1883
1884 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1885 ULOG_ERR("%s is not a block device or file\n", argv[1]);
1886 return -1;
1887 }
1888 err = swapoff(argv[1]);
1889 if (err) {
1890 ULOG_ERR("failed to swapoff %s (%d)\n", argv[1], err);
1891 return err;
1892 }
1893 }
1894
1895 return 0;
1896 }
1897
1898 int main(int argc, char **argv)
1899 {
1900 char *base = basename(*argv);
1901
1902 umask(0);
1903
1904 ulog_open(-1, -1, "block");
1905 ulog_threshold(LOG_NOTICE);
1906
1907 if (!strcmp(base, "swapon"))
1908 return main_swapon(argc, argv);
1909
1910 if (!strcmp(base, "swapoff"))
1911 return main_swapoff(argc, argv);
1912
1913 if ((argc > 1) && !strcmp(base, "block")) {
1914 if (!strcmp(argv[1], "info"))
1915 return main_info(argc, argv);
1916
1917 if (!strcmp(argv[1], "detect"))
1918 return main_detect(argc, argv);
1919
1920 if (!strcmp(argv[1], "hotplug"))
1921 return main_hotplug(argc, argv);
1922
1923 if (!strcmp(argv[1], "autofs"))
1924 return main_autofs(argc, argv);
1925
1926 if (!strcmp(argv[1], "extroot"))
1927 return main_extroot(argc, argv);
1928
1929 if (!strcmp(argv[1], "mount"))
1930 return main_mount(argc, argv);
1931
1932 if (!strcmp(argv[1], "umount"))
1933 return main_umount(argc, argv);
1934
1935 if (!strcmp(argv[1], "remount")) {
1936 int ret = main_umount(argc, argv);
1937
1938 if (!ret)
1939 ret = main_mount(argc, argv);
1940 return ret;
1941 }
1942 }
1943
1944 ULOG_ERR("Usage: block <info|mount|umount|detect>\n");
1945
1946 return -1;
1947 }
OpenWrt filesystem utilities