partname: Introduce fstools_partname_fallback_scan option
[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 <uci.h>
37 #include <uci_blob.h>
38
39 #include <libubox/avl-cmp.h>
40 #include <libubox/blobmsg_json.h>
41 #include <libubox/list.h>
42 #include <libubox/ulog.h>
43 #include <libubox/utils.h>
44 #include <libubox/vlist.h>
45 #include <libubus.h>
46
47 #include "probe.h"
48
49 #define AUTOFS_MOUNT_PATH "/tmp/run/blockd/"
50
51 #ifdef UBIFS_EXTROOT
52 #include "libubi/libubi.h"
53 #endif
54
55 enum {
56 TYPE_MOUNT,
57 TYPE_SWAP,
58 };
59
60 enum {
61 TYPE_DEV,
62 TYPE_HOTPLUG,
63 TYPE_AUTOFS,
64 };
65
66 struct mount {
67 struct vlist_node node;
68 int type;
69
70 char *target;
71 char *path;
72 char *options;
73 uint32_t flags;
74 char *uuid;
75 char *label;
76 char *device;
77 int extroot;
78 int autofs;
79 int overlay;
80 int disabled_fsck;
81 unsigned int prio;
82 };
83
84 static struct vlist_tree mounts;
85 static struct blob_buf b;
86 static LIST_HEAD(devices);
87 static int anon_mount, anon_swap, auto_mount, auto_swap, check_fs;
88 static unsigned int delay_root;
89
90 enum {
91 CFG_ANON_MOUNT,
92 CFG_ANON_SWAP,
93 CFG_AUTO_MOUNT,
94 CFG_AUTO_SWAP,
95 CFG_DELAY_ROOT,
96 CFG_CHECK_FS,
97 __CFG_MAX
98 };
99
100 static const struct blobmsg_policy config_policy[__CFG_MAX] = {
101 [CFG_ANON_SWAP] = { .name = "anon_swap", .type = BLOBMSG_TYPE_INT32 },
102 [CFG_ANON_MOUNT] = { .name = "anon_mount", .type = BLOBMSG_TYPE_INT32 },
103 [CFG_AUTO_SWAP] = { .name = "auto_swap", .type = BLOBMSG_TYPE_INT32 },
104 [CFG_AUTO_MOUNT] = { .name = "auto_mount", .type = BLOBMSG_TYPE_INT32 },
105 [CFG_DELAY_ROOT] = { .name = "delay_root", .type = BLOBMSG_TYPE_INT32 },
106 [CFG_CHECK_FS] = { .name = "check_fs", .type = BLOBMSG_TYPE_INT32 },
107 };
108
109 enum {
110 MOUNT_UUID,
111 MOUNT_LABEL,
112 MOUNT_ENABLE,
113 MOUNT_TARGET,
114 MOUNT_DEVICE,
115 MOUNT_OPTIONS,
116 MOUNT_AUTOFS,
117 __MOUNT_MAX
118 };
119
120 static const struct uci_blob_param_list config_attr_list = {
121 .n_params = __CFG_MAX,
122 .params = config_policy,
123 };
124
125 static const struct blobmsg_policy mount_policy[__MOUNT_MAX] = {
126 [MOUNT_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
127 [MOUNT_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
128 [MOUNT_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
129 [MOUNT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
130 [MOUNT_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_STRING },
131 [MOUNT_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
132 [MOUNT_AUTOFS] = { .name = "autofs", .type = BLOBMSG_TYPE_INT32 },
133 };
134
135 static const struct uci_blob_param_list mount_attr_list = {
136 .n_params = __MOUNT_MAX,
137 .params = mount_policy,
138 };
139
140 enum {
141 SWAP_ENABLE,
142 SWAP_UUID,
143 SWAP_LABEL,
144 SWAP_DEVICE,
145 SWAP_PRIO,
146 __SWAP_MAX
147 };
148
149 static const struct blobmsg_policy swap_policy[__SWAP_MAX] = {
150 [SWAP_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
151 [SWAP_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
152 [SWAP_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
153 [SWAP_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
154 [SWAP_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 },
155 };
156
157 static const struct uci_blob_param_list swap_attr_list = {
158 .n_params = __SWAP_MAX,
159 .params = swap_policy,
160 };
161
162 struct mount_flag {
163 const char *name;
164 int32_t flag;
165 };
166
167 static const struct mount_flag mount_flags[] = {
168 { "sync", MS_SYNCHRONOUS },
169 { "async", ~MS_SYNCHRONOUS },
170 { "dirsync", MS_DIRSYNC },
171 { "mand", MS_MANDLOCK },
172 { "nomand", ~MS_MANDLOCK },
173 { "atime", ~MS_NOATIME },
174 { "noatime", MS_NOATIME },
175 { "dev", ~MS_NODEV },
176 { "nodev", MS_NODEV },
177 { "diratime", ~MS_NODIRATIME },
178 { "nodiratime", MS_NODIRATIME },
179 { "exec", ~MS_NOEXEC },
180 { "noexec", MS_NOEXEC },
181 { "suid", ~MS_NOSUID },
182 { "nosuid", MS_NOSUID },
183 { "rw", ~MS_RDONLY },
184 { "ro", MS_RDONLY },
185 { "relatime", MS_RELATIME },
186 { "norelatime", ~MS_RELATIME },
187 { "strictatime", MS_STRICTATIME },
188 { "acl", MS_POSIXACL },
189 { "noacl", ~MS_POSIXACL },
190 { "nouser_xattr", MS_NOUSER },
191 { "user_xattr", ~MS_NOUSER },
192 };
193
194 static char *blobmsg_get_strdup(struct blob_attr *attr)
195 {
196 if (!attr)
197 return NULL;
198
199 return strdup(blobmsg_get_string(attr));
200 }
201
202 static char *blobmsg_get_basename(struct blob_attr *attr)
203 {
204 if (!attr)
205 return NULL;
206
207 return strdup(basename(blobmsg_get_string(attr)));
208 }
209
210 static void parse_mount_options(struct mount *m, char *optstr)
211 {
212 int i;
213 bool is_flag;
214 char *p, *opts, *last;
215
216 m->flags = 0;
217 m->options = NULL;
218
219 if (!optstr || !*optstr)
220 return;
221
222 m->options = opts = calloc(1, strlen(optstr) + 1);
223
224 if (!m->options)
225 return;
226
227 p = last = optstr;
228
229 do {
230 p = strchr(p, ',');
231
232 if (p)
233 *p++ = 0;
234
235 for (i = 0, is_flag = false; i < ARRAY_SIZE(mount_flags); i++) {
236 if (!strcmp(last, mount_flags[i].name)) {
237 if (mount_flags[i].flag < 0)
238 m->flags &= (uint32_t)mount_flags[i].flag;
239 else
240 m->flags |= (uint32_t)mount_flags[i].flag;
241 is_flag = true;
242 break;
243 }
244 }
245
246 if (!is_flag)
247 opts += sprintf(opts, "%s%s", (opts > m->options) ? "," : "", last);
248
249 last = p;
250
251 } while (p);
252
253 free(optstr);
254 }
255
256 static int mount_add(struct uci_section *s)
257 {
258 struct blob_attr *tb[__MOUNT_MAX] = { 0 };
259 struct mount *m;
260
261 blob_buf_init(&b, 0);
262 uci_to_blob(&b, s, &mount_attr_list);
263 blobmsg_parse(mount_policy, __MOUNT_MAX, tb, blob_data(b.head), blob_len(b.head));
264
265 if (!tb[MOUNT_LABEL] && !tb[MOUNT_UUID] && !tb[MOUNT_DEVICE])
266 return -1;
267
268 if (tb[MOUNT_ENABLE] && !blobmsg_get_u32(tb[MOUNT_ENABLE]))
269 return -1;
270
271 m = malloc(sizeof(struct mount));
272 m->type = TYPE_MOUNT;
273 m->uuid = blobmsg_get_strdup(tb[MOUNT_UUID]);
274 m->label = blobmsg_get_strdup(tb[MOUNT_LABEL]);
275 m->target = blobmsg_get_strdup(tb[MOUNT_TARGET]);
276 m->device = blobmsg_get_basename(tb[MOUNT_DEVICE]);
277 if (tb[MOUNT_AUTOFS])
278 m->autofs = blobmsg_get_u32(tb[MOUNT_AUTOFS]);
279 else
280 m->autofs = 0;
281 parse_mount_options(m, blobmsg_get_strdup(tb[MOUNT_OPTIONS]));
282
283 m->overlay = m->extroot = 0;
284 if (m->target && !strcmp(m->target, "/"))
285 m->extroot = 1;
286 if (m->target && !strcmp(m->target, "/overlay"))
287 m->extroot = m->overlay = 1;
288
289 if (m->target && *m->target != '/') {
290 ULOG_WARN("ignoring mount section %s due to invalid target '%s'\n",
291 s->e.name, m->target);
292 free(m);
293 return -1;
294 }
295
296 if (m->uuid)
297 vlist_add(&mounts, &m->node, m->uuid);
298 else if (m->label)
299 vlist_add(&mounts, &m->node, m->label);
300 else if (m->device)
301 vlist_add(&mounts, &m->node, m->device);
302
303 return 0;
304 }
305
306 static int swap_add(struct uci_section *s)
307 {
308 struct blob_attr *tb[__SWAP_MAX] = { 0 };
309 struct mount *m;
310
311 blob_buf_init(&b, 0);
312 uci_to_blob(&b, s, &swap_attr_list);
313 blobmsg_parse(swap_policy, __SWAP_MAX, tb, blob_data(b.head), blob_len(b.head));
314
315 if (!tb[SWAP_UUID] && !tb[SWAP_LABEL] && !tb[SWAP_DEVICE])
316 return -1;
317
318 m = malloc(sizeof(struct mount));
319 memset(m, 0, sizeof(struct mount));
320 m->type = TYPE_SWAP;
321 m->uuid = blobmsg_get_strdup(tb[SWAP_UUID]);
322 m->label = blobmsg_get_strdup(tb[SWAP_LABEL]);
323 m->device = blobmsg_get_basename(tb[SWAP_DEVICE]);
324 if (tb[SWAP_PRIO])
325 m->prio = blobmsg_get_u32(tb[SWAP_PRIO]);
326 if (m->prio)
327 m->prio = ((m->prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
328
329 if ((!tb[SWAP_ENABLE]) || blobmsg_get_u32(tb[SWAP_ENABLE])) {
330 /* store complete swap path */
331 if (tb[SWAP_DEVICE])
332 m->target = blobmsg_get_strdup(tb[SWAP_DEVICE]);
333
334 if (m->uuid)
335 vlist_add(&mounts, &m->node, m->uuid);
336 else if (m->label)
337 vlist_add(&mounts, &m->node, m->label);
338 else if (m->device)
339 vlist_add(&mounts, &m->node, m->device);
340 }
341
342 return 0;
343 }
344
345 static int global_add(struct uci_section *s)
346 {
347 struct blob_attr *tb[__CFG_MAX] = { 0 };
348
349 blob_buf_init(&b, 0);
350 uci_to_blob(&b, s, &config_attr_list);
351 blobmsg_parse(config_policy, __CFG_MAX, tb, blob_data(b.head), blob_len(b.head));
352
353 if ((tb[CFG_ANON_MOUNT]) && blobmsg_get_u32(tb[CFG_ANON_MOUNT]))
354 anon_mount = 1;
355 if ((tb[CFG_ANON_SWAP]) && blobmsg_get_u32(tb[CFG_ANON_SWAP]))
356 anon_swap = 1;
357
358 if ((tb[CFG_AUTO_MOUNT]) && blobmsg_get_u32(tb[CFG_AUTO_MOUNT]))
359 auto_mount = 1;
360 if ((tb[CFG_AUTO_SWAP]) && blobmsg_get_u32(tb[CFG_AUTO_SWAP]))
361 auto_swap = 1;
362
363 if (tb[CFG_DELAY_ROOT])
364 delay_root = blobmsg_get_u32(tb[CFG_DELAY_ROOT]);
365
366 if ((tb[CFG_CHECK_FS]) && blobmsg_get_u32(tb[CFG_CHECK_FS]))
367 check_fs = 1;
368
369 return 0;
370 }
371
372 static struct mount* find_swap(const char *uuid, const char *label, const char *device)
373 {
374 struct mount *m;
375
376 vlist_for_each_element(&mounts, m, node) {
377 if (m->type != TYPE_SWAP)
378 continue;
379 if (uuid && m->uuid && !strcasecmp(m->uuid, uuid))
380 return m;
381 if (label && m->label && !strcmp(m->label, label))
382 return m;
383 if (device && m->device && !strcmp(m->device, device))
384 return m;
385 }
386
387 return NULL;
388 }
389
390 static struct mount* find_block(const char *uuid, const char *label, const char *device,
391 const char *target)
392 {
393 struct mount *m;
394
395 vlist_for_each_element(&mounts, m, node) {
396 if (m->type != TYPE_MOUNT)
397 continue;
398 if (m->uuid && uuid && !strcasecmp(m->uuid, uuid))
399 return m;
400 if (m->label && label && !strcmp(m->label, label))
401 return m;
402 if (m->target && target && !strcmp(m->target, target))
403 return m;
404 if (m->device && device && !strcmp(m->device, device))
405 return m;
406 }
407
408 return NULL;
409 }
410
411 static void mounts_update(struct vlist_tree *tree, struct vlist_node *node_new,
412 struct vlist_node *node_old)
413 {
414 }
415
416 static struct uci_package * config_try_load(struct uci_context *ctx, char *path)
417 {
418 char *file = basename(path);
419 char *dir = dirname(path);
420 char *err;
421 struct uci_package *pkg;
422
423 uci_set_confdir(ctx, dir);
424 ULOG_INFO("attempting to load %s/%s\n", dir, file);
425
426 if (uci_load(ctx, file, &pkg)) {
427 uci_get_errorstr(ctx, &err, file);
428 ULOG_ERR("unable to load configuration (%s)\n", err);
429
430 free(err);
431 return NULL;
432 }
433
434 return pkg;
435 }
436
437 static int config_load(char *cfg)
438 {
439 struct uci_context *ctx = uci_alloc_context();
440 struct uci_package *pkg = NULL;
441 struct uci_element *e;
442 char path[64];
443
444 vlist_init(&mounts, avl_strcmp, mounts_update);
445
446 if (cfg) {
447 snprintf(path, sizeof(path), "%s/upper/etc/config/fstab", cfg);
448 pkg = config_try_load(ctx, path);
449
450 if (!pkg) {
451 snprintf(path, sizeof(path), "%s/etc/config/fstab", cfg);
452 pkg = config_try_load(ctx, path);
453 }
454 }
455
456 if (!pkg) {
457 snprintf(path, sizeof(path), "/etc/config/fstab");
458 pkg = config_try_load(ctx, path);
459 }
460
461 if (!pkg) {
462 ULOG_ERR("no usable configuration\n");
463 return -1;
464 }
465
466 vlist_update(&mounts);
467 uci_foreach_element(&pkg->sections, e) {
468 struct uci_section *s = uci_to_section(e);
469
470 if (!strcmp(s->type, "mount"))
471 mount_add(s);
472 if (!strcmp(s->type, "swap"))
473 swap_add(s);
474 if (!strcmp(s->type, "global"))
475 global_add(s);
476 }
477 vlist_flush(&mounts);
478
479 return 0;
480 }
481
482 static bool mtdblock_is_nand(char *mtdnum)
483 {
484 char tmppath[64];
485 char buf[16];
486 FILE *fp;
487
488 snprintf(tmppath, sizeof(tmppath) - 1, "/sys/class/mtd/mtd%s/type", mtdnum);
489 fp = fopen(tmppath, "r");
490 if (!fp)
491 return false;
492
493 if (!fgets(buf, sizeof(buf), fp)) {
494 fclose(fp);
495 return false;
496 }
497 fclose(fp);
498 buf[sizeof(buf) - 1] = '\0'; /* make sure buf is 0-terminated */
499 buf[strlen(buf) - 1] = '\0'; /* strip final char (newline) */
500
501 if (strcmp(buf, "nand"))
502 return false;
503
504 /*
505 * --- CUT HERE ---
506 * Keep probing rootfs and rootfs_data in the meantime to not break
507 * devices using JFFS2 on NAND but only trigger the kernel warnings.
508 * Remove this once all devices using JFFS2 and squashfs directly on
509 * NAND have been converted to UBI.
510 */
511 snprintf(tmppath, sizeof(tmppath) - 1, "/sys/class/mtd/mtd%s/name", mtdnum);
512 fp = fopen(tmppath, "r");
513 if (!fp)
514 return false;
515
516 if (!fgets(buf, sizeof(buf), fp)) {
517 fclose(fp);
518 return false;
519 }
520 fclose(fp);
521 buf[sizeof(buf) - 1] = '\0'; /* make sure buf is 0-terminated */
522 buf[strlen(buf) - 1] = '\0'; /* strip final char (newline) */
523
524 /* only return true if name differs from 'rootfs' and 'rootfs_data' */
525 if (strcmp(buf, "rootfs") && strcmp(buf, "rootfs_data"))
526 return true;
527
528 /* --- CUT HERE --- */
529 return false;
530 }
531
532 static struct probe_info* _probe_path(char *path)
533 {
534 struct probe_info *pr, *epr;
535 char tmppath[64];
536
537 if (!strncmp(path, "/dev/mtdblock", 13) && mtdblock_is_nand(path + 13))
538 return NULL;
539
540 pr = probe_path(path);
541 if (!pr)
542 return NULL;
543
544 if (path[5] == 'u' && path[6] == 'b' && path[7] == 'i' &&
545 path[8] >= '0' && path[8] <= '9' ) {
546 /* skip ubi device if not UBIFS (as it requires ubiblock) */
547 if (strcmp("ubifs", pr->type))
548 return NULL;
549
550 /* skip ubi device if ubiblock device is present */
551 snprintf(tmppath, sizeof(tmppath), "/dev/ubiblock%s", path + 8);
552 list_for_each_entry(epr, &devices, list)
553 if (!strcmp(epr->dev, tmppath))
554 return NULL;
555 }
556
557 return pr;
558 }
559
560 static int _cache_load(const char *path)
561 {
562 int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
563 int j;
564 glob_t gl;
565
566 if (glob(path, gl_flags, NULL, &gl) < 0)
567 return -1;
568
569 for (j = 0; j < gl.gl_pathc; j++) {
570 struct probe_info *pr = _probe_path(gl.gl_pathv[j]);
571 if (pr)
572 list_add_tail(&pr->list, &devices);
573 }
574
575 globfree(&gl);
576
577 return 0;
578 }
579
580 static void cache_load(int mtd)
581 {
582 if (mtd) {
583 _cache_load("/dev/mtdblock*");
584 _cache_load("/dev/ubiblock*");
585 _cache_load("/dev/ubi[0-9]*");
586 }
587 _cache_load("/dev/loop*");
588 _cache_load("/dev/mmcblk*");
589 _cache_load("/dev/sd*");
590 _cache_load("/dev/hd*");
591 _cache_load("/dev/md*");
592 _cache_load("/dev/nvme*");
593 _cache_load("/dev/vd*");
594 _cache_load("/dev/xvd*");
595 _cache_load("/dev/dm-*");
596 }
597
598
599 static struct probe_info* find_block_info(char *uuid, char *label, char *path)
600 {
601 struct probe_info *pr = NULL;
602
603 if (uuid)
604 list_for_each_entry(pr, &devices, list)
605 if (pr->uuid && !strcasecmp(pr->uuid, uuid))
606 return pr;
607
608 if (label)
609 list_for_each_entry(pr, &devices, list)
610 if (pr->label && !strcmp(pr->label, label))
611 return pr;
612
613 if (path)
614 list_for_each_entry(pr, &devices, list)
615 if (pr->dev && !strcmp(basename(pr->dev), basename(path)))
616 return pr;
617
618 return NULL;
619 }
620
621 static char* find_mount_point(char *block)
622 {
623 FILE *fp = fopen("/proc/self/mountinfo", "r");
624 static char line[256];
625 char *point = NULL, *pos, *tmp, *cpoint, *devname;
626 struct stat s;
627 int rstat;
628 unsigned int minor, major;
629
630 if (!fp)
631 return NULL;
632
633 rstat = stat(block, &s);
634
635 while (fgets(line, sizeof(line), fp)) {
636 pos = strchr(line, ' ');
637 if (!pos)
638 continue;
639
640 pos = strchr(pos + 1, ' ');
641 if (!pos)
642 continue;
643
644 tmp = ++pos;
645 pos = strchr(pos, ':');
646 if (!pos)
647 continue;
648
649 *pos = '\0';
650 major = atoi(tmp);
651 tmp = ++pos;
652 pos = strchr(pos, ' ');
653 if (!pos)
654 continue;
655
656 *pos = '\0';
657 minor = atoi(tmp);
658 pos = strchr(pos + 1, ' ');
659 if (!pos)
660 continue;
661 tmp = ++pos;
662
663 pos = strchr(pos, ' ');
664 if (!pos)
665 continue;
666 *pos = '\0';
667 cpoint = tmp;
668
669 pos = strchr(pos + 1, ' ');
670 if (!pos)
671 continue;
672
673 pos = strchr(pos + 1, ' ');
674 if (!pos)
675 continue;
676
677 pos = strchr(pos + 1, ' ');
678 if (!pos)
679 continue;
680
681 tmp = ++pos;
682 pos = strchr(pos, ' ');
683 if (!pos)
684 continue;
685
686 *pos = '\0';
687 devname = tmp;
688 if (!strcmp(block, devname)) {
689 point = strdup(cpoint);
690 break;
691 }
692
693 if (rstat)
694 continue;
695
696 if (!S_ISBLK(s.st_mode))
697 continue;
698
699 if (major == major(s.st_rdev) &&
700 minor == minor(s.st_rdev)) {
701 point = strdup(cpoint);
702 break;
703 }
704 }
705
706 fclose(fp);
707
708 return point;
709 }
710
711 static int print_block_uci(struct probe_info *pr)
712 {
713 if (!strcmp(pr->type, "swap")) {
714 printf("config 'swap'\n");
715 } else {
716 char *mp = find_mount_point(pr->dev);
717
718 printf("config 'mount'\n");
719 if (mp) {
720 printf("\toption\ttarget\t'%s'\n", mp);
721 free(mp);
722 } else {
723 printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev));
724 }
725 }
726 if (pr->uuid)
727 printf("\toption\tuuid\t'%s'\n", pr->uuid);
728 else
729 printf("\toption\tdevice\t'%s'\n", pr->dev);
730 printf("\toption\tenabled\t'0'\n\n");
731
732 return 0;
733 }
734
735 static int print_block_info(struct probe_info *pr)
736 {
737 static char *mp;
738
739 mp = find_mount_point(pr->dev);
740 printf("%s:", pr->dev);
741 if (pr->uuid)
742 printf(" UUID=\"%s\"", pr->uuid);
743
744 if (pr->label)
745 printf(" LABEL=\"%s\"", pr->label);
746
747 if (pr->version)
748 printf(" VERSION=\"%s\"", pr->version);
749
750 if (mp) {
751 printf(" MOUNT=\"%s\"", mp);
752 free(mp);
753 }
754
755 printf(" TYPE=\"%s\"\n", pr->type);
756
757 return 0;
758 }
759
760 static void check_filesystem(struct probe_info *pr)
761 {
762 pid_t pid;
763 struct stat statbuf;
764 const char *e2fsck = "/usr/sbin/e2fsck";
765 const char *f2fsck = "/usr/sbin/fsck.f2fs";
766 const char *fatfsck = "/usr/sbin/fsck.fat";
767 const char *btrfsck = "/usr/bin/btrfsck";
768 const char *ntfsck = "/usr/bin/ntfsfix";
769 const char *ckfs;
770
771 /* UBIFS does not need stuff like fsck */
772 if (!strncmp(pr->type, "ubifs", 5))
773 return;
774
775 if (!strncmp(pr->type, "vfat", 4)) {
776 ckfs = fatfsck;
777 } else if (!strncmp(pr->type, "f2fs", 4)) {
778 ckfs = f2fsck;
779 } else if (!strncmp(pr->type, "ext", 3)) {
780 ckfs = e2fsck;
781 } else if (!strncmp(pr->type, "btrfs", 5)) {
782 ckfs = btrfsck;
783 } else if (!strncmp(pr->type, "ntfs", 4)) {
784 ckfs = ntfsck;
785 } else {
786 ULOG_ERR("check_filesystem: %s is not supported\n", pr->type);
787 return;
788 }
789
790 if (stat(ckfs, &statbuf) < 0) {
791 ULOG_ERR("check_filesystem: %s not found\n", ckfs);
792 return;
793 }
794
795 pid = fork();
796 if (!pid) {
797 if(!strncmp(pr->type, "f2fs", 4)) {
798 execl(ckfs, ckfs, "-f", pr->dev, NULL);
799 exit(EXIT_FAILURE);
800 } else if(!strncmp(pr->type, "btrfs", 5)) {
801 execl(ckfs, ckfs, "--repair", pr->dev, NULL);
802 exit(EXIT_FAILURE);
803 } else if(!strncmp(pr->type, "ntfs", 4)) {
804 execl(ckfs, ckfs, "-b", pr->dev, NULL);
805 exit(EXIT_FAILURE);
806 } else {
807 execl(ckfs, ckfs, "-p", pr->dev, NULL);
808 exit(EXIT_FAILURE);
809 }
810 } else if (pid > 0) {
811 int status;
812
813 waitpid(pid, &status, 0);
814 if (WIFEXITED(status) && WEXITSTATUS(status))
815 ULOG_ERR("check_filesystem: %s returned %d\n", ckfs, WEXITSTATUS(status));
816 if (WIFSIGNALED(status))
817 ULOG_ERR("check_filesystem: %s terminated by %s\n", ckfs, strsignal(WTERMSIG(status)));
818 }
819 }
820
821 static void handle_swapfiles(bool on)
822 {
823 struct stat s;
824 struct mount *m;
825 struct probe_info *pr;
826
827 vlist_for_each_element(&mounts, m, node)
828 {
829 if (m->type != TYPE_SWAP || !m->target)
830 continue;
831
832 if (stat(m->target, &s) || !S_ISREG(s.st_mode))
833 continue;
834
835 pr = _probe_path(m->target);
836
837 if (!pr)
838 continue;
839
840 if (!strcmp(pr->type, "swap")) {
841 if (on)
842 swapon(pr->dev, m->prio);
843 else
844 swapoff(pr->dev);
845 }
846
847 free(pr);
848 }
849 }
850
851 static void to_devnull(int fd)
852 {
853 int devnull = open("/dev/null", fd ? O_WRONLY : O_RDONLY);
854
855 if (devnull >= 0)
856 dup2(devnull, fd);
857
858 if (devnull > STDERR_FILENO)
859 close(devnull);
860 }
861
862 static int exec_mount(const char *source, const char *target,
863 const char *fstype, const char *options)
864 {
865 pid_t pid;
866 struct stat s;
867 FILE *mount_fd;
868 int err, status, pfds[2];
869 char errmsg[128], cmd[sizeof("/sbin/mount.XXXXXXXXXXXXXXXX\0")];
870
871 snprintf(cmd, sizeof(cmd), "/sbin/mount.%s", fstype);
872
873 if (stat(cmd, &s) < 0 || !S_ISREG(s.st_mode) || !(s.st_mode & S_IXUSR)) {
874 ULOG_ERR("No \"mount.%s\" utility available\n", fstype);
875 return -1;
876 }
877
878 if (pipe(pfds) < 0)
879 return -1;
880
881 fcntl(pfds[0], F_SETFD, fcntl(pfds[0], F_GETFD) | FD_CLOEXEC);
882 fcntl(pfds[1], F_SETFD, fcntl(pfds[1], F_GETFD) | FD_CLOEXEC);
883
884 pid = vfork();
885
886 switch (pid) {
887 case -1:
888 close(pfds[0]);
889 close(pfds[1]);
890
891 return -1;
892
893 case 0:
894 to_devnull(STDIN_FILENO);
895 to_devnull(STDOUT_FILENO);
896
897 dup2(pfds[1], STDERR_FILENO);
898 close(pfds[0]);
899 close(pfds[1]);
900
901 if (options && *options)
902 execl(cmd, cmd, "-o", options, source, target, NULL);
903 else
904 execl(cmd, cmd, source, target, NULL);
905
906 return -1;
907
908 default:
909 close(pfds[1]);
910
911 mount_fd = fdopen(pfds[0], "r");
912
913 while (fgets(errmsg, sizeof(errmsg), mount_fd))
914 ULOG_ERR("mount.%s: %s", fstype, errmsg);
915
916 fclose(mount_fd);
917
918 err = waitpid(pid, &status, 0);
919
920 if (err != -1) {
921 if (status != 0) {
922 ULOG_ERR("mount.%s: failed with status %d\n", fstype, status);
923 errno = EINVAL;
924 err = -1;
925 } else {
926 errno = 0;
927 err = 0;
928 }
929 }
930
931 break;
932 }
933
934 return err;
935 }
936
937 static const char * const ntfs_fs[] = { "ntfs3", "ntfs-3g", "antfs", "ntfs" };
938
939 static int handle_mount(const char *source, const char *target,
940 const char *fstype, struct mount *m)
941 {
942 size_t mount_opts_len;
943 char *mount_opts = NULL, *ptr;
944 const char * const *filesystems;
945 int err = -EINVAL;
946 size_t count;
947 int i;
948
949 if (!strcmp(fstype, "ntfs")) {
950 filesystems = ntfs_fs;
951 count = ARRAY_SIZE(ntfs_fs);
952 } else {
953 filesystems = &fstype;
954 count = 1;
955 }
956
957 for (i = 0; i < count; i++) {
958 const char *fs = filesystems[i];
959
960 err = mount(source, target, fs, m ? m->flags : 0,
961 (m && m->options) ? m->options : "");
962 if (!err || errno != ENODEV)
963 break;
964 }
965
966 /* Requested file system type is not available in kernel,
967 attempt to call mount helper. */
968 if (err == -1 && errno == ENODEV) {
969 if (m) {
970 /* Convert mount flags back into string representation,
971 first calculate needed length of string buffer... */
972 mount_opts_len = 1 + (m->options ? strlen(m->options) : 0);
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 mount_opts_len += strlen(mount_flags[i].name) + 1;
979
980 /* ... then now allocate and fill it ... */
981 ptr = mount_opts = calloc(1, mount_opts_len);
982
983 if (!ptr) {
984 errno = ENOMEM;
985 return -1;
986 }
987
988 if (m->options)
989 ptr += sprintf(ptr, "%s,", m->options);
990
991 for (i = 0; i < ARRAY_SIZE(mount_flags); i++)
992 if ((mount_flags[i].flag > 0) &&
993 (mount_flags[i].flag < INT_MAX) &&
994 (m->flags & (uint32_t)mount_flags[i].flag))
995 ptr += sprintf(ptr, "%s,", mount_flags[i].name);
996
997 mount_opts[mount_opts_len - 1] = 0;
998 }
999
1000 /* ... and now finally invoke the external mount program */
1001 for (i = 0; i < count; i++) {
1002 const char *fs = filesystems[i];
1003
1004 err = exec_mount(source, target, fs, mount_opts);
1005 if (!err)
1006 break;
1007 }
1008 }
1009
1010 free(mount_opts);
1011
1012 return err;
1013 }
1014
1015 static int blockd_notify(const char *method, char *device, struct mount *m,
1016 struct probe_info *pr)
1017 {
1018 struct ubus_context *ctx = ubus_connect(NULL);
1019 uint32_t id;
1020 int err;
1021
1022 if (!ctx)
1023 return -ENXIO;
1024
1025 if (!ubus_lookup_id(ctx, "block", &id)) {
1026 struct blob_buf buf = { 0 };
1027 char *d = strrchr(device, '/');
1028
1029 if (d)
1030 d++;
1031 else
1032 d = device;
1033
1034 blob_buf_init(&buf, 0);
1035
1036 if (m) {
1037
1038 blobmsg_add_string(&buf, "device", d);
1039 if (m->uuid)
1040 blobmsg_add_string(&buf, "uuid", m->uuid);
1041 if (m->label)
1042 blobmsg_add_string(&buf, "label", m->label);
1043 if (m->target)
1044 blobmsg_add_string(&buf, "target", m->target);
1045 if (m->options)
1046 blobmsg_add_string(&buf, "options", m->options);
1047 if (m->autofs)
1048 blobmsg_add_u32(&buf, "autofs", m->autofs);
1049 if (pr->type)
1050 blobmsg_add_string(&buf, "type", pr->type);
1051 if (pr->version)
1052 blobmsg_add_string(&buf, "version", pr->version);
1053 } else if (pr) {
1054 blobmsg_add_string(&buf, "device", d);
1055 if (pr->uuid)
1056 blobmsg_add_string(&buf, "uuid", pr->uuid);
1057 if (pr->label)
1058 blobmsg_add_string(&buf, "label", pr->label);
1059 if (pr->type)
1060 blobmsg_add_string(&buf, "type", pr->type);
1061 if (pr->version)
1062 blobmsg_add_string(&buf, "version", pr->version);
1063 blobmsg_add_u32(&buf, "anon", 1);
1064 } else {
1065 blobmsg_add_string(&buf, "device", d);
1066 blobmsg_add_u32(&buf, "remove", 1);
1067 }
1068
1069 err = ubus_invoke(ctx, id, method, buf.head, NULL, NULL, 3000);
1070 } else {
1071 err = -ENOENT;
1072 }
1073
1074 ubus_free(ctx);
1075
1076 return err;
1077 }
1078
1079 static int mount_device(struct probe_info *pr, int type)
1080 {
1081 struct mount *m;
1082 struct stat st;
1083 char *_target = NULL;
1084 char *target;
1085 char *device;
1086 char *mp;
1087 int err;
1088
1089 if (!pr)
1090 return -1;
1091
1092 device = basename(pr->dev);
1093
1094 if (!strcmp(pr->type, "swap")) {
1095 if ((type == TYPE_HOTPLUG) && !auto_swap)
1096 return -1;
1097 m = find_swap(pr->uuid, pr->label, device);
1098 if (m || anon_swap)
1099 swapon(pr->dev, (m) ? (m->prio) : (0));
1100
1101 return 0;
1102 }
1103
1104 m = find_block(pr->uuid, pr->label, device, NULL);
1105 if (m && m->extroot)
1106 return -1;
1107
1108 mp = find_mount_point(pr->dev);
1109 if (mp) {
1110 if (m && m->type == TYPE_MOUNT && m->target && strcmp(m->target, mp)) {
1111 ULOG_ERR("%s is already mounted on %s\n", pr->dev, mp);
1112 err = -1;
1113 } else
1114 err = 0;
1115 free(mp);
1116 return err;
1117 }
1118
1119 if (type == TYPE_HOTPLUG)
1120 blockd_notify("hotplug", device, m, pr);
1121
1122 /* Check if device should be mounted & set the target directory */
1123 if (m) {
1124 switch (type) {
1125 case TYPE_HOTPLUG:
1126 if (m->autofs)
1127 return 0;
1128 if (!auto_mount)
1129 return -1;
1130 break;
1131 case TYPE_AUTOFS:
1132 if (!m->autofs)
1133 return -1;
1134 break;
1135 case TYPE_DEV:
1136 if (m->autofs)
1137 return -1;
1138 break;
1139 }
1140
1141 if (m->autofs) {
1142 if (asprintf(&_target, "/tmp/run/blockd/%s", device) == -1)
1143 exit(ENOMEM);
1144
1145 target = _target;
1146 } else if (m->target) {
1147 target = m->target;
1148 } else {
1149 if (asprintf(&_target, "/mnt/%s", device) == -1)
1150 exit(ENOMEM);
1151
1152 target = _target;
1153 }
1154 } else if (anon_mount) {
1155 if (asprintf(&_target, "/mnt/%s", device) == -1)
1156 exit(ENOMEM);
1157
1158 target = _target;
1159 } else {
1160 /* No reason to mount this device */
1161 return 0;
1162 }
1163
1164 /* Mount the device */
1165
1166 if (check_fs)
1167 check_filesystem(pr);
1168
1169 mkdir_p(target, 0755);
1170 if (!lstat(target, &st) && S_ISLNK(st.st_mode))
1171 unlink(target);
1172
1173 err = handle_mount(pr->dev, target, pr->type, m);
1174 if (err) {
1175 ULOG_ERR("mounting %s (%s) as %s failed (%d) - %m\n",
1176 pr->dev, pr->type, target, errno);
1177
1178 if (_target)
1179 free(_target);
1180
1181 return err;
1182 }
1183
1184 if (_target)
1185 free(_target);
1186
1187 handle_swapfiles(true);
1188
1189 if (type != TYPE_AUTOFS)
1190 blockd_notify("mount", device, NULL, NULL);
1191
1192 return 0;
1193 }
1194
1195 static int umount_device(char *path, int type, bool all)
1196 {
1197 char *mp, *devpath;
1198 int err;
1199
1200 if (strlen(path) > 5 && !strncmp("/dev/", path, 5)) {
1201 mp = find_mount_point(path);
1202 } else {
1203 devpath = malloc(strlen(path) + 6);
1204 strcpy(devpath, "/dev/");
1205 strcat(devpath, path);
1206 mp = find_mount_point(devpath);
1207 free(devpath);
1208 }
1209
1210 if (!mp)
1211 return -1;
1212 if (!strcmp(mp, "/") && !all) {
1213 free(mp);
1214 return 0;
1215 }
1216 if (type != TYPE_AUTOFS)
1217 blockd_notify("umount", basename(path), NULL, NULL);
1218
1219 err = umount2(mp, MNT_DETACH);
1220 if (err) {
1221 ULOG_ERR("unmounting %s (%s) failed (%d) - %m\n", path, mp,
1222 errno);
1223 } else {
1224 ULOG_INFO("unmounted %s (%s)\n", path, mp);
1225 rmdir(mp);
1226 }
1227
1228 free(mp);
1229 return err;
1230 }
1231
1232 static int mount_action(char *action, char *device, int type)
1233 {
1234 char *path = NULL;
1235 struct probe_info *pr;
1236
1237 if (!action || !device)
1238 return -1;
1239
1240 if (!strcmp(action, "remove")) {
1241 if (type == TYPE_HOTPLUG)
1242 blockd_notify("hotplug", device, NULL, NULL);
1243
1244 umount_device(device, type, true);
1245
1246 return 0;
1247 } else if (strcmp(action, "add")) {
1248 ULOG_ERR("Unkown action %s\n", action);
1249
1250 return -1;
1251 }
1252
1253 if (config_load(NULL))
1254 return -1;
1255
1256 cache_load(1);
1257
1258 list_for_each_entry(pr, &devices, list)
1259 if (!strcmp(basename(pr->dev), device))
1260 path = pr->dev;
1261
1262 if (!path)
1263 return -1;
1264
1265 return mount_device(find_block_info(NULL, NULL, path), type);
1266 }
1267
1268 static int main_hotplug(int argc, char **argv)
1269 {
1270 return mount_action(getenv("ACTION"), getenv("DEVNAME"), TYPE_HOTPLUG);
1271 }
1272
1273 static int main_autofs(int argc, char **argv)
1274 {
1275 int err = 0;
1276
1277 if (argc < 3)
1278 return -1;
1279
1280 if (!strcmp(argv[2], "start")) {
1281 struct probe_info *pr;
1282
1283 if (config_load(NULL))
1284 return -1;
1285
1286 cache_load(1);
1287 list_for_each_entry(pr, &devices, list) {
1288 struct mount *m;
1289 char *mp;
1290
1291 if (!strcmp(pr->type, "swap"))
1292 continue;
1293
1294 m = find_block(pr->uuid, pr->label, NULL, NULL);
1295 if (m && m->extroot)
1296 continue;
1297
1298 blockd_notify("hotplug", pr->dev, m, pr);
1299 if ((!m || !m->autofs) && (mp = find_mount_point(pr->dev))) {
1300 blockd_notify("mount", pr->dev, NULL, NULL);
1301 free(mp);
1302 }
1303 }
1304 } else {
1305 if (argc < 4)
1306 return -EINVAL;
1307
1308 err = mount_action(argv[2], argv[3], TYPE_AUTOFS);
1309 }
1310
1311 if (err) {
1312 ULOG_ERR("autofs: \"%s\" action has failed: %d\n", argv[2], err);
1313 }
1314
1315 return err;
1316 }
1317
1318 static int find_block_mtd(char *name, char *part, int plen)
1319 {
1320 FILE *fp = fopen("/proc/mtd", "r");
1321 static char line[256];
1322 char *index = NULL;
1323
1324 if(!fp)
1325 return -1;
1326
1327 while (!index && fgets(line, sizeof(line), fp)) {
1328 if (strstr(line, name)) {
1329 char *eol = strstr(line, ":");
1330
1331 if (!eol)
1332 continue;
1333
1334 *eol = '\0';
1335 index = &line[3];
1336 }
1337 }
1338
1339 fclose(fp);
1340
1341 if (!index)
1342 return -1;
1343
1344 snprintf(part, plen, "/dev/mtdblock%s", index);
1345
1346 return 0;
1347 }
1348
1349 #ifdef UBIFS_EXTROOT
1350 static int find_ubi_vol(libubi_t libubi, char *name, int *dev_num, int *vol_id)
1351 {
1352 int dev = 0;
1353
1354 while (ubi_dev_present(libubi, dev))
1355 {
1356 struct ubi_dev_info dev_info;
1357 struct ubi_vol_info vol_info;
1358
1359 if (ubi_get_dev_info1(libubi, dev++, &dev_info))
1360 continue;
1361 if (ubi_get_vol_info1_nm(libubi, dev_info.dev_num, name, &vol_info))
1362 continue;
1363
1364 *dev_num = dev_info.dev_num;
1365 *vol_id = vol_info.vol_id;
1366
1367 return 0;
1368 }
1369
1370 return -1;
1371 }
1372
1373 static int find_block_ubi(libubi_t libubi, char *name, char *part, int plen)
1374 {
1375 int dev_num;
1376 int vol_id;
1377 int err = -1;
1378
1379 err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
1380 if (!err)
1381 snprintf(part, plen, "/dev/ubi%d_%d", dev_num, vol_id);
1382
1383 return err;
1384 }
1385
1386 static int find_block_ubi_RO(libubi_t libubi, char *name, char *part, int plen)
1387 {
1388 int dev_num;
1389 int vol_id;
1390 int err = -1;
1391
1392 err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
1393 if (!err)
1394 snprintf(part, plen, "/dev/ubiblock%d_%d", dev_num, vol_id);
1395
1396 return err;
1397 }
1398 #endif
1399
1400 static int find_root_dev(char *buf, int len)
1401 {
1402 DIR *d;
1403 dev_t root;
1404 struct stat s;
1405 struct dirent *e;
1406
1407 if (stat("/", &s))
1408 return -1;
1409
1410 if (!(d = opendir("/dev")))
1411 return -1;
1412
1413 root = s.st_dev;
1414
1415 while ((e = readdir(d)) != NULL) {
1416 snprintf(buf, len, "/dev/%s", e->d_name);
1417
1418 if (stat(buf, &s) || s.st_rdev != root)
1419 continue;
1420
1421 closedir(d);
1422 return 0;
1423 }
1424
1425 closedir(d);
1426 return -1;
1427 }
1428
1429 static int test_fs_support(const char *name)
1430 {
1431 char line[128], *p;
1432 int rv = -1;
1433 FILE *f;
1434
1435 if ((f = fopen("/proc/filesystems", "r")) != NULL) {
1436 while (fgets(line, sizeof(line), f)) {
1437 p = strtok(line, "\t\n");
1438
1439 if (p && !strcmp(p, "nodev"))
1440 p = strtok(NULL, "\t\n");
1441
1442 if (p && !strcmp(p, name)) {
1443 rv = 0;
1444 break;
1445 }
1446 }
1447 fclose(f);
1448 }
1449
1450 return rv;
1451 }
1452
1453 /**
1454 * Check if mounted partition is a valid extroot
1455 *
1456 * @path target mount point
1457 *
1458 * Valid extroot partition has to contain /etc/.extroot-uuid with UUID of root
1459 * device. This function reads UUID and verifies it OR writes UUID to
1460 * .extroot-uuid if it doesn't exist yet (first extroot usage).
1461 */
1462 static int check_extroot(char *path)
1463 {
1464 struct probe_info *pr = NULL;
1465 struct probe_info *tmp;
1466 struct stat s;
1467 char uuid[64] = { 0 };
1468 char devpath[32];
1469 char tag[64];
1470 FILE *fp;
1471 int err;
1472
1473 err = find_block_mtd("\"rootfs\"", devpath, sizeof(devpath));
1474 #ifdef UBIFS_EXTROOT
1475 if (err) {
1476 libubi_t libubi;
1477
1478 libubi = libubi_open();
1479 err = find_block_ubi_RO(libubi, "rootfs", devpath, sizeof(devpath));
1480 libubi_close(libubi);
1481 }
1482 #endif
1483 if (err) {
1484 err = find_root_dev(devpath, sizeof(devpath));
1485 }
1486 if (err) {
1487 ULOG_ERR("extroot: unable to determine root device\n");
1488 return -1;
1489 }
1490
1491 /* Find root device probe_info so we know its UUID */
1492 list_for_each_entry(tmp, &devices, list) {
1493 if (!strcmp(tmp->dev, devpath)) {
1494 pr = tmp;
1495 break;
1496 }
1497 }
1498 if (!pr) {
1499 ULOG_ERR("extroot: unable to lookup root device %s\n", devpath);
1500 return -1;
1501 }
1502
1503 snprintf(tag, sizeof(tag), "%s/etc", path);
1504 if (stat(tag, &s))
1505 mkdir_p(tag, 0755);
1506
1507 snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
1508 if (stat(tag, &s)) {
1509 fp = fopen(tag, "w+");
1510 if (!fp) {
1511 ULOG_ERR("extroot: failed to write UUID to %s: %d (%m)\n",
1512 tag, errno);
1513 /* return 0 to continue boot regardless of error */
1514 return 0;
1515 }
1516 fputs(pr->uuid, fp);
1517 fclose(fp);
1518 return 0;
1519 }
1520
1521 fp = fopen(tag, "r");
1522 if (!fp) {
1523 ULOG_ERR("extroot: failed to read UUID from %s: %d (%m)\n", tag,
1524 errno);
1525 return -1;
1526 }
1527
1528 if (!fgets(uuid, sizeof(uuid), fp))
1529 ULOG_ERR("extroot: failed to read UUID from %s: %d (%m)\n", tag,
1530 errno);
1531 fclose(fp);
1532
1533 if (*uuid && !strcasecmp(uuid, pr->uuid))
1534 return 0;
1535
1536 ULOG_ERR("extroot: UUID mismatch (root: %s, %s: %s)\n", pr->uuid,
1537 basename(path), uuid);
1538 return -1;
1539 }
1540
1541 /*
1542 * Read info about extroot from UCI (using prefix) and mount it.
1543 */
1544 static int mount_extroot(char *cfg)
1545 {
1546 char overlay[] = "/tmp/extroot/overlay";
1547 char mnt[] = "/tmp/extroot/mnt";
1548 char *path = mnt;
1549 struct probe_info *pr;
1550 struct mount *m;
1551 int err = -1;
1552
1553 /* Load @cfg/etc/config/fstab */
1554 if (config_load(cfg))
1555 return -2;
1556
1557 /* See if there is extroot-specific mount config */
1558 m = find_block(NULL, NULL, NULL, "/");
1559 if (!m)
1560 m = find_block(NULL, NULL, NULL, "/overlay");
1561
1562 if (!m || !m->extroot)
1563 {
1564 ULOG_INFO("extroot: not configured\n");
1565 return -1;
1566 }
1567
1568 /* Find block device pointed by the mount config */
1569 pr = find_block_info(m->uuid, m->label, m->device);
1570
1571 if (!pr && delay_root){
1572 ULOG_INFO("extroot: device not present, retrying in %u seconds\n", delay_root);
1573 sleep(delay_root);
1574 make_devs();
1575 cache_load(1);
1576 pr = find_block_info(m->uuid, m->label, m->device);
1577 }
1578 if (pr) {
1579 if (strncmp(pr->type, "ext", 3) &&
1580 strncmp(pr->type, "f2fs", 4) &&
1581 strncmp(pr->type, "btrfs", 5) &&
1582 strncmp(pr->type, "ntfs", 4) &&
1583 strncmp(pr->type, "ubifs", 5)) {
1584 ULOG_ERR("extroot: unsupported filesystem %s, try ext4, f2fs, btrfs, ntfs or ubifs\n", pr->type);
1585 return -1;
1586 }
1587
1588 if (test_fs_support(pr->type)) {
1589 ULOG_ERR("extroot: filesystem %s not supported by kernel\n", pr->type);
1590 return -1;
1591 }
1592
1593 if (m->overlay)
1594 path = overlay;
1595 mkdir_p(path, 0755);
1596
1597 if (check_fs)
1598 check_filesystem(pr);
1599
1600 err = mount(pr->dev, path, pr->type, m->flags,
1601 (m->options) ? (m->options) : (""));
1602
1603 if (err) {
1604 ULOG_ERR("extroot: mounting %s (%s) on %s failed: %d (%m)\n",
1605 pr->dev, pr->type, path, errno);
1606 } else if (m->overlay) {
1607 err = check_extroot(path);
1608 if (err)
1609 umount(path);
1610 }
1611 } else {
1612 ULOG_ERR("extroot: cannot find device %s%s\n",
1613 (m->uuid ? "with UUID " : (m->label ? "with label " : "")),
1614 (m->uuid ? m->uuid : (m->label ? m->label : m->device)));
1615 }
1616
1617 return err;
1618 }
1619
1620 /**
1621 * Look for extroot config and mount it if present
1622 *
1623 * Look for /etc/config/fstab on all supported partitions and use it for
1624 * mounting extroot if specified.
1625 */
1626 static int main_extroot(int argc, char **argv)
1627 {
1628 struct probe_info *pr;
1629 char blkdev_path[32] = { 0 };
1630 int err = -1;
1631 #ifdef UBIFS_EXTROOT
1632 libubi_t libubi;
1633 #endif
1634
1635 if (!getenv("PREINIT"))
1636 return -1;
1637
1638 if (argc != 2) {
1639 ULOG_ERR("Usage: block extroot\n");
1640 return -1;
1641 }
1642
1643 make_devs();
1644 cache_load(1);
1645
1646 /* enable LOG_INFO messages */
1647 ulog_threshold(LOG_INFO);
1648
1649 /*
1650 * Look for "rootfs_data". We will want to mount it and check for
1651 * extroot configuration.
1652 */
1653
1654 /* Start with looking for MTD partition */
1655 find_block_mtd("\"rootfs_data\"", blkdev_path, sizeof(blkdev_path));
1656 if (blkdev_path[0]) {
1657 pr = find_block_info(NULL, NULL, blkdev_path);
1658 if (pr && !strcmp(pr->type, "jffs2")) {
1659 char cfg[] = "/tmp/jffs_cfg";
1660
1661 /*
1662 * Mount MTD part and try extroot (using
1663 * /etc/config/fstab from that partition)
1664 */
1665 mkdir_p(cfg, 0755);
1666 if (!mount(blkdev_path, cfg, "jffs2", MS_NOATIME, NULL)) {
1667 err = mount_extroot(cfg);
1668 umount2(cfg, MNT_DETACH);
1669 }
1670 if (err < 0)
1671 rmdir("/tmp/overlay");
1672 rmdir(cfg);
1673 return err;
1674 }
1675 }
1676
1677 #ifdef UBIFS_EXTROOT
1678 /* ... but it also could be an UBI volume */
1679 memset(blkdev_path, 0, sizeof(blkdev_path));
1680 libubi = libubi_open();
1681 find_block_ubi(libubi, "rootfs_data", blkdev_path, sizeof(blkdev_path));
1682 libubi_close(libubi);
1683 if (blkdev_path[0]) {
1684 char cfg[] = "/tmp/ubifs_cfg";
1685
1686 /* Mount volume and try extroot (using fstab from that vol) */
1687 mkdir_p(cfg, 0755);
1688 if (!mount(blkdev_path, cfg, "ubifs", MS_NOATIME, NULL)) {
1689 err = mount_extroot(cfg);
1690 umount2(cfg, MNT_DETACH);
1691 }
1692 if (err < 0)
1693 rmdir("/tmp/overlay");
1694 rmdir(cfg);
1695 return err;
1696 }
1697 #endif
1698
1699 /* As a last resort look for /etc/config/fstab on "rootfs" partition */
1700 return mount_extroot(NULL);
1701 }
1702
1703 static int main_mount(int argc, char **argv)
1704 {
1705 struct probe_info *pr;
1706
1707 if (config_load(NULL))
1708 return -1;
1709
1710 cache_load(1);
1711 list_for_each_entry(pr, &devices, list)
1712 mount_device(pr, TYPE_DEV);
1713
1714 handle_swapfiles(true);
1715
1716 return 0;
1717 }
1718
1719 static int main_umount(int argc, char **argv)
1720 {
1721 struct probe_info *pr;
1722 bool all = false;
1723
1724 if (config_load(NULL))
1725 return -1;
1726
1727 handle_swapfiles(false);
1728
1729 cache_load(1);
1730
1731 if (argc == 3)
1732 all = !strcmp(argv[2], "-a");
1733
1734 list_for_each_entry(pr, &devices, list) {
1735 struct mount *m;
1736
1737 if (!strcmp(pr->type, "swap"))
1738 continue;
1739
1740 m = find_block(pr->uuid, pr->label, basename(pr->dev), NULL);
1741 if (m && m->extroot)
1742 continue;
1743
1744 umount_device(pr->dev, TYPE_DEV, all);
1745 }
1746
1747 return 0;
1748 }
1749
1750 static int main_detect(int argc, char **argv)
1751 {
1752 struct probe_info *pr;
1753
1754 cache_load(0);
1755 printf("config 'global'\n");
1756 printf("\toption\tanon_swap\t'0'\n");
1757 printf("\toption\tanon_mount\t'0'\n");
1758 printf("\toption\tauto_swap\t'1'\n");
1759 printf("\toption\tauto_mount\t'1'\n");
1760 printf("\toption\tdelay_root\t'5'\n");
1761 printf("\toption\tcheck_fs\t'0'\n\n");
1762 list_for_each_entry(pr, &devices, list)
1763 print_block_uci(pr);
1764
1765 return 0;
1766 }
1767
1768 static int main_info(int argc, char **argv)
1769 {
1770 int i;
1771 struct probe_info *pr;
1772
1773 cache_load(1);
1774 if (argc == 2) {
1775 list_for_each_entry(pr, &devices, list)
1776 print_block_info(pr);
1777
1778 return 0;
1779 };
1780
1781 for (i = 2; i < argc; i++) {
1782 struct stat s;
1783
1784 if (stat(argv[i], &s)) {
1785 ULOG_ERR("failed to stat %s\n", argv[i]);
1786 continue;
1787 }
1788 if (!S_ISBLK(s.st_mode) && !(S_ISCHR(s.st_mode) && major(s.st_rdev) == 250)) {
1789 ULOG_ERR("%s is not a block device\n", argv[i]);
1790 continue;
1791 }
1792 pr = find_block_info(NULL, NULL, argv[i]);
1793 if (pr)
1794 print_block_info(pr);
1795 }
1796
1797 return 0;
1798 }
1799
1800 static int swapon_usage(void)
1801 {
1802 fprintf(stderr, "Usage: swapon [-s] [-a] [[-p pri] DEVICE]\n\n"
1803 "\tStart swapping on [DEVICE]\n"
1804 " -a\tStart swapping on all swap devices\n"
1805 " -p pri\tSet priority of swap device\n"
1806 " -s\tShow summary\n");
1807 return -1;
1808 }
1809
1810 static int main_swapon(int argc, char **argv)
1811 {
1812 int ch;
1813 FILE *fp;
1814 char *lineptr;
1815 size_t s;
1816 struct probe_info *pr;
1817 int flags = 0;
1818 int pri;
1819 struct stat st;
1820 int err;
1821
1822 while ((ch = getopt(argc, argv, "ap:s")) != -1) {
1823 switch(ch) {
1824 case 's':
1825 fp = fopen("/proc/swaps", "r");
1826 lineptr = NULL;
1827
1828 if (!fp) {
1829 ULOG_ERR("failed to open /proc/swaps\n");
1830 return -1;
1831 }
1832 while (getline(&lineptr, &s, fp) > 0)
1833 printf("%s", lineptr);
1834 if (lineptr)
1835 free(lineptr);
1836 fclose(fp);
1837 return 0;
1838 case 'a':
1839 cache_load(0);
1840 list_for_each_entry(pr, &devices, list) {
1841 if (strcmp(pr->type, "swap"))
1842 continue;
1843 if (swapon(pr->dev, 0))
1844 ULOG_ERR("failed to swapon %s\n", pr->dev);
1845 }
1846 return 0;
1847 case 'p':
1848 pri = atoi(optarg);
1849 if (pri >= 0)
1850 flags = ((pri << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
1851 break;
1852 default:
1853 return swapon_usage();
1854 }
1855 }
1856
1857 if (optind != (argc - 1))
1858 return swapon_usage();
1859
1860 if (stat(argv[optind], &st) || (!S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))) {
1861 ULOG_ERR("%s is not a block device or file\n", argv[optind]);
1862 return -1;
1863 }
1864 err = swapon(argv[optind], flags);
1865 if (err) {
1866 ULOG_ERR("failed to swapon %s (%d)\n", argv[optind], err);
1867 return err;
1868 }
1869
1870 return 0;
1871 }
1872
1873 static int main_swapoff(int argc, char **argv)
1874 {
1875 if (argc != 2) {
1876 ULOG_ERR("Usage: swapoff [-a] [DEVICE]\n\n"
1877 "\tStop swapping on DEVICE\n"
1878 " -a\tStop swapping on all swap devices\n");
1879 return -1;
1880 }
1881
1882 if (!strcmp(argv[1], "-a")) {
1883 FILE *fp = fopen("/proc/swaps", "r");
1884 char line[256];
1885
1886 if (!fp) {
1887 ULOG_ERR("failed to open /proc/swaps\n");
1888 return -1;
1889 }
1890 if (fgets(line, sizeof(line), fp))
1891 while (fgets(line, sizeof(line), fp)) {
1892 char *end = strchr(line, ' ');
1893 int err;
1894
1895 if (!end)
1896 continue;
1897 *end = '\0';
1898 err = swapoff(line);
1899 if (err)
1900 ULOG_ERR("failed to swapoff %s (%d)\n", line, err);
1901 }
1902 fclose(fp);
1903 } else {
1904 struct stat s;
1905 int err;
1906
1907 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1908 ULOG_ERR("%s is not a block device or file\n", argv[1]);
1909 return -1;
1910 }
1911 err = swapoff(argv[1]);
1912 if (err) {
1913 ULOG_ERR("failed to swapoff %s (%d)\n", argv[1], err);
1914 return err;
1915 }
1916 }
1917
1918 return 0;
1919 }
1920
1921 int main(int argc, char **argv)
1922 {
1923 char *base = basename(*argv);
1924
1925 umask(0);
1926
1927 ulog_open(-1, -1, "block");
1928 ulog_threshold(LOG_NOTICE);
1929
1930 if (!strcmp(base, "swapon"))
1931 return main_swapon(argc, argv);
1932
1933 if (!strcmp(base, "swapoff"))
1934 return main_swapoff(argc, argv);
1935
1936 if ((argc > 1) && !strcmp(base, "block")) {
1937 if (!strcmp(argv[1], "info"))
1938 return main_info(argc, argv);
1939
1940 if (!strcmp(argv[1], "detect"))
1941 return main_detect(argc, argv);
1942
1943 if (!strcmp(argv[1], "hotplug"))
1944 return main_hotplug(argc, argv);
1945
1946 if (!strcmp(argv[1], "autofs"))
1947 return main_autofs(argc, argv);
1948
1949 if (!strcmp(argv[1], "extroot"))
1950 return main_extroot(argc, argv);
1951
1952 if (!strcmp(argv[1], "mount"))
1953 return main_mount(argc, argv);
1954
1955 if (!strcmp(argv[1], "umount"))
1956 return main_umount(argc, argv);
1957
1958 if (!strcmp(argv[1], "remount")) {
1959 int ret = main_umount(argc, argv);
1960
1961 if (!ret)
1962 ret = main_mount(argc, argv);
1963 return ret;
1964 }
1965 }
1966
1967 ULOG_ERR("Usage: block <info|mount|umount|detect>\n");
1968
1969 return -1;
1970 }