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libfstools: fit: improve fit_volume_find string handling
[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 _cache_load("/dev/fit*");
597 }
598
599
600 static struct probe_info* find_block_info(char *uuid, char *label, char *path)
601 {
602 struct probe_info *pr = NULL;
603
604 if (uuid)
605 list_for_each_entry(pr, &devices, list)
606 if (pr->uuid && !strcasecmp(pr->uuid, uuid))
607 return pr;
608
609 if (label)
610 list_for_each_entry(pr, &devices, list)
611 if (pr->label && !strcmp(pr->label, label))
612 return pr;
613
614 if (path)
615 list_for_each_entry(pr, &devices, list)
616 if (pr->dev && !strcmp(basename(pr->dev), basename(path)))
617 return pr;
618
619 return NULL;
620 }
621
622 static char* find_mount_point(char *block)
623 {
624 FILE *fp = fopen("/proc/self/mountinfo", "r");
625 static char line[256];
626 char *point = NULL, *pos, *tmp, *cpoint, *devname;
627 struct stat s;
628 int rstat;
629 unsigned int minor, major;
630
631 if (!fp)
632 return NULL;
633
634 rstat = stat(block, &s);
635
636 while (fgets(line, sizeof(line), fp)) {
637 pos = strchr(line, ' ');
638 if (!pos)
639 continue;
640
641 pos = strchr(pos + 1, ' ');
642 if (!pos)
643 continue;
644
645 tmp = ++pos;
646 pos = strchr(pos, ':');
647 if (!pos)
648 continue;
649
650 *pos = '\0';
651 major = atoi(tmp);
652 tmp = ++pos;
653 pos = strchr(pos, ' ');
654 if (!pos)
655 continue;
656
657 *pos = '\0';
658 minor = atoi(tmp);
659 pos = strchr(pos + 1, ' ');
660 if (!pos)
661 continue;
662 tmp = ++pos;
663
664 pos = strchr(pos, ' ');
665 if (!pos)
666 continue;
667 *pos = '\0';
668 cpoint = tmp;
669
670 pos = strchr(pos + 1, ' ');
671 if (!pos)
672 continue;
673
674 pos = strchr(pos + 1, ' ');
675 if (!pos)
676 continue;
677
678 pos = strchr(pos + 1, ' ');
679 if (!pos)
680 continue;
681
682 tmp = ++pos;
683 pos = strchr(pos, ' ');
684 if (!pos)
685 continue;
686
687 *pos = '\0';
688 devname = tmp;
689 if (!strcmp(block, devname)) {
690 point = strdup(cpoint);
691 break;
692 }
693
694 if (rstat)
695 continue;
696
697 if (!S_ISBLK(s.st_mode))
698 continue;
699
700 if (major == major(s.st_rdev) &&
701 minor == minor(s.st_rdev)) {
702 point = strdup(cpoint);
703 break;
704 }
705 }
706
707 fclose(fp);
708
709 return point;
710 }
711
712 static int print_block_uci(struct probe_info *pr)
713 {
714 if (!strcmp(pr->type, "swap")) {
715 printf("config 'swap'\n");
716 } else {
717 char *mp = find_mount_point(pr->dev);
718
719 printf("config 'mount'\n");
720 if (mp) {
721 printf("\toption\ttarget\t'%s'\n", mp);
722 free(mp);
723 } else {
724 printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev));
725 }
726 }
727 if (pr->uuid)
728 printf("\toption\tuuid\t'%s'\n", pr->uuid);
729 else
730 printf("\toption\tdevice\t'%s'\n", pr->dev);
731 printf("\toption\tenabled\t'0'\n\n");
732
733 return 0;
734 }
735
736 static int print_block_info(struct probe_info *pr)
737 {
738 static char *mp;
739
740 mp = find_mount_point(pr->dev);
741 printf("%s:", pr->dev);
742 if (pr->uuid)
743 printf(" UUID=\"%s\"", pr->uuid);
744
745 if (pr->label)
746 printf(" LABEL=\"%s\"", pr->label);
747
748 if (pr->version)
749 printf(" VERSION=\"%s\"", pr->version);
750
751 if (mp) {
752 printf(" MOUNT=\"%s\"", mp);
753 free(mp);
754 }
755
756 printf(" TYPE=\"%s\"\n", pr->type);
757
758 return 0;
759 }
760
761 static void check_filesystem(struct probe_info *pr)
762 {
763 pid_t pid;
764 struct stat statbuf;
765 const char *e2fsck = "/usr/sbin/e2fsck";
766 const char *f2fsck = "/usr/sbin/fsck.f2fs";
767 const char *fatfsck = "/usr/sbin/fsck.fat";
768 const char *btrfsck = "/usr/bin/btrfsck";
769 const char *ntfsck = "/usr/bin/ntfsfix";
770 const char *ckfs;
771
772 /* UBIFS does not need stuff like fsck */
773 if (!strncmp(pr->type, "ubifs", 5))
774 return;
775
776 if (!strncmp(pr->type, "vfat", 4)) {
777 ckfs = fatfsck;
778 } else if (!strncmp(pr->type, "f2fs", 4)) {
779 ckfs = f2fsck;
780 } else if (!strncmp(pr->type, "ext", 3)) {
781 ckfs = e2fsck;
782 } else if (!strncmp(pr->type, "btrfs", 5)) {
783 ckfs = btrfsck;
784 } else if (!strncmp(pr->type, "ntfs", 4)) {
785 ckfs = ntfsck;
786 } else {
787 ULOG_ERR("check_filesystem: %s is not supported\n", pr->type);
788 return;
789 }
790
791 if (stat(ckfs, &statbuf) < 0) {
792 ULOG_ERR("check_filesystem: %s not found\n", ckfs);
793 return;
794 }
795
796 pid = fork();
797 if (!pid) {
798 if(!strncmp(pr->type, "f2fs", 4)) {
799 execl(ckfs, ckfs, "-f", pr->dev, NULL);
800 exit(EXIT_FAILURE);
801 } else if(!strncmp(pr->type, "btrfs", 5)) {
802 execl(ckfs, ckfs, "--repair", pr->dev, NULL);
803 exit(EXIT_FAILURE);
804 } else if(!strncmp(pr->type, "ntfs", 4)) {
805 execl(ckfs, ckfs, "-b", pr->dev, NULL);
806 exit(EXIT_FAILURE);
807 } else {
808 execl(ckfs, ckfs, "-p", pr->dev, NULL);
809 exit(EXIT_FAILURE);
810 }
811 } else if (pid > 0) {
812 int status;
813
814 waitpid(pid, &status, 0);
815 if (WIFEXITED(status) && WEXITSTATUS(status))
816 ULOG_ERR("check_filesystem: %s returned %d\n", ckfs, WEXITSTATUS(status));
817 if (WIFSIGNALED(status))
818 ULOG_ERR("check_filesystem: %s terminated by %s\n", ckfs, strsignal(WTERMSIG(status)));
819 }
820 }
821
822 static void handle_swapfiles(bool on)
823 {
824 struct stat s;
825 struct mount *m;
826 struct probe_info *pr;
827
828 vlist_for_each_element(&mounts, m, node)
829 {
830 if (m->type != TYPE_SWAP || !m->target)
831 continue;
832
833 if (stat(m->target, &s) || !S_ISREG(s.st_mode))
834 continue;
835
836 pr = _probe_path(m->target);
837
838 if (!pr)
839 continue;
840
841 if (!strcmp(pr->type, "swap")) {
842 if (on)
843 swapon(pr->dev, m->prio);
844 else
845 swapoff(pr->dev);
846 }
847
848 free(pr);
849 }
850 }
851
852 static void to_devnull(int fd)
853 {
854 int devnull = open("/dev/null", fd ? O_WRONLY : O_RDONLY);
855
856 if (devnull >= 0)
857 dup2(devnull, fd);
858
859 if (devnull > STDERR_FILENO)
860 close(devnull);
861 }
862
863 static int exec_mount(const char *source, const char *target,
864 const char *fstype, const char *options)
865 {
866 pid_t pid;
867 struct stat s;
868 FILE *mount_fd;
869 int err, status, pfds[2];
870 char errmsg[128], cmd[sizeof("/sbin/mount.XXXXXXXXXXXXXXXX\0")];
871
872 snprintf(cmd, sizeof(cmd), "/sbin/mount.%s", fstype);
873
874 if (stat(cmd, &s) < 0 || !S_ISREG(s.st_mode) || !(s.st_mode & S_IXUSR)) {
875 ULOG_ERR("No \"mount.%s\" utility available\n", fstype);
876 return -1;
877 }
878
879 if (pipe(pfds) < 0)
880 return -1;
881
882 fcntl(pfds[0], F_SETFD, fcntl(pfds[0], F_GETFD) | FD_CLOEXEC);
883 fcntl(pfds[1], F_SETFD, fcntl(pfds[1], F_GETFD) | FD_CLOEXEC);
884
885 pid = vfork();
886
887 switch (pid) {
888 case -1:
889 close(pfds[0]);
890 close(pfds[1]);
891
892 return -1;
893
894 case 0:
895 to_devnull(STDIN_FILENO);
896 to_devnull(STDOUT_FILENO);
897
898 dup2(pfds[1], STDERR_FILENO);
899 close(pfds[0]);
900 close(pfds[1]);
901
902 if (options && *options)
903 execl(cmd, cmd, "-o", options, source, target, NULL);
904 else
905 execl(cmd, cmd, source, target, NULL);
906
907 return -1;
908
909 default:
910 close(pfds[1]);
911
912 mount_fd = fdopen(pfds[0], "r");
913
914 while (fgets(errmsg, sizeof(errmsg), mount_fd))
915 ULOG_ERR("mount.%s: %s", fstype, errmsg);
916
917 fclose(mount_fd);
918
919 err = waitpid(pid, &status, 0);
920
921 if (err != -1) {
922 if (status != 0) {
923 ULOG_ERR("mount.%s: failed with status %d\n", fstype, status);
924 errno = EINVAL;
925 err = -1;
926 } else {
927 errno = 0;
928 err = 0;
929 }
930 }
931
932 break;
933 }
934
935 return err;
936 }
937
938 static const char * const ntfs_fs[] = { "ntfs3", "ntfs-3g", "antfs", "ntfs" };
939
940 static int handle_mount(const char *source, const char *target,
941 const char *fstype, struct mount *m)
942 {
943 size_t mount_opts_len;
944 char *mount_opts = NULL, *ptr;
945 const char * const *filesystems;
946 int err = -EINVAL;
947 size_t count;
948 int i;
949
950 if (!strcmp(fstype, "ntfs")) {
951 filesystems = ntfs_fs;
952 count = ARRAY_SIZE(ntfs_fs);
953 } else {
954 filesystems = &fstype;
955 count = 1;
956 }
957
958 for (i = 0; i < count; i++) {
959 const char *fs = filesystems[i];
960
961 err = mount(source, target, fs, m ? m->flags : 0,
962 (m && m->options) ? m->options : "");
963 if (!err || errno != ENODEV)
964 break;
965 }
966
967 /* Requested file system type is not available in kernel,
968 attempt to call mount helper. */
969 if (err == -1 && errno == ENODEV) {
970 if (m) {
971 /* Convert mount flags back into string representation,
972 first calculate needed length of string buffer... */
973 mount_opts_len = 1 + (m->options ? strlen(m->options) : 0);
974
975 for (i = 0; i < ARRAY_SIZE(mount_flags); i++)
976 if ((mount_flags[i].flag > 0) &&
977 (mount_flags[i].flag < INT_MAX) &&
978 (m->flags & (uint32_t)mount_flags[i].flag))
979 mount_opts_len += strlen(mount_flags[i].name) + 1;
980
981 /* ... then now allocate and fill it ... */
982 ptr = mount_opts = calloc(1, mount_opts_len);
983
984 if (!ptr) {
985 errno = ENOMEM;
986 return -1;
987 }
988
989 if (m->options)
990 ptr += sprintf(ptr, "%s,", m->options);
991
992 for (i = 0; i < ARRAY_SIZE(mount_flags); i++)
993 if ((mount_flags[i].flag > 0) &&
994 (mount_flags[i].flag < INT_MAX) &&
995 (m->flags & (uint32_t)mount_flags[i].flag))
996 ptr += sprintf(ptr, "%s,", mount_flags[i].name);
997
998 mount_opts[mount_opts_len - 1] = 0;
999 }
1000
1001 /* ... and now finally invoke the external mount program */
1002 for (i = 0; i < count; i++) {
1003 const char *fs = filesystems[i];
1004
1005 err = exec_mount(source, target, fs, mount_opts);
1006 if (!err)
1007 break;
1008 }
1009 }
1010
1011 free(mount_opts);
1012
1013 return err;
1014 }
1015
1016 static int blockd_notify(const char *method, char *device, struct mount *m,
1017 struct probe_info *pr)
1018 {
1019 struct ubus_context *ctx = ubus_connect(NULL);
1020 uint32_t id;
1021 int err;
1022
1023 if (!ctx)
1024 return -ENXIO;
1025
1026 if (!ubus_lookup_id(ctx, "block", &id)) {
1027 struct blob_buf buf = { 0 };
1028 char *d = strrchr(device, '/');
1029
1030 if (d)
1031 d++;
1032 else
1033 d = device;
1034
1035 blob_buf_init(&buf, 0);
1036
1037 if (m) {
1038
1039 blobmsg_add_string(&buf, "device", d);
1040 if (m->uuid)
1041 blobmsg_add_string(&buf, "uuid", m->uuid);
1042 if (m->label)
1043 blobmsg_add_string(&buf, "label", m->label);
1044 if (m->target)
1045 blobmsg_add_string(&buf, "target", m->target);
1046 if (m->options)
1047 blobmsg_add_string(&buf, "options", m->options);
1048 if (m->autofs)
1049 blobmsg_add_u32(&buf, "autofs", m->autofs);
1050 if (pr->type)
1051 blobmsg_add_string(&buf, "type", pr->type);
1052 if (pr->version)
1053 blobmsg_add_string(&buf, "version", pr->version);
1054 } else if (pr) {
1055 blobmsg_add_string(&buf, "device", d);
1056 if (pr->uuid)
1057 blobmsg_add_string(&buf, "uuid", pr->uuid);
1058 if (pr->label)
1059 blobmsg_add_string(&buf, "label", pr->label);
1060 if (pr->type)
1061 blobmsg_add_string(&buf, "type", pr->type);
1062 if (pr->version)
1063 blobmsg_add_string(&buf, "version", pr->version);
1064 blobmsg_add_u32(&buf, "anon", 1);
1065 } else {
1066 blobmsg_add_string(&buf, "device", d);
1067 blobmsg_add_u32(&buf, "remove", 1);
1068 }
1069
1070 err = ubus_invoke(ctx, id, method, buf.head, NULL, NULL, 3000);
1071 } else {
1072 err = -ENOENT;
1073 }
1074
1075 ubus_free(ctx);
1076
1077 return err;
1078 }
1079
1080 static int mount_device(struct probe_info *pr, int type)
1081 {
1082 struct mount *m;
1083 struct stat st;
1084 char *_target = NULL;
1085 char *target;
1086 char *device;
1087 char *mp;
1088 int err;
1089
1090 if (!pr)
1091 return -1;
1092
1093 device = basename(pr->dev);
1094
1095 if (!strcmp(pr->type, "swap")) {
1096 if ((type == TYPE_HOTPLUG) && !auto_swap)
1097 return -1;
1098 m = find_swap(pr->uuid, pr->label, device);
1099 if (m || anon_swap)
1100 swapon(pr->dev, (m) ? (m->prio) : (0));
1101
1102 return 0;
1103 }
1104
1105 m = find_block(pr->uuid, pr->label, device, NULL);
1106 if (m && m->extroot)
1107 return -1;
1108
1109 mp = find_mount_point(pr->dev);
1110 if (mp) {
1111 if (m && m->type == TYPE_MOUNT && m->target && strcmp(m->target, mp)) {
1112 ULOG_ERR("%s is already mounted on %s\n", pr->dev, mp);
1113 err = -1;
1114 } else
1115 err = 0;
1116 free(mp);
1117 return err;
1118 }
1119
1120 if (type == TYPE_HOTPLUG)
1121 blockd_notify("hotplug", device, m, pr);
1122
1123 /* Check if device should be mounted & set the target directory */
1124 if (m) {
1125 switch (type) {
1126 case TYPE_HOTPLUG:
1127 if (m->autofs)
1128 return 0;
1129 if (!auto_mount)
1130 return -1;
1131 break;
1132 case TYPE_AUTOFS:
1133 if (!m->autofs)
1134 return -1;
1135 break;
1136 case TYPE_DEV:
1137 if (m->autofs)
1138 return -1;
1139 break;
1140 }
1141
1142 if (m->autofs) {
1143 if (asprintf(&_target, "/tmp/run/blockd/%s", device) == -1)
1144 exit(ENOMEM);
1145
1146 target = _target;
1147 } else if (m->target) {
1148 target = m->target;
1149 } else {
1150 if (asprintf(&_target, "/mnt/%s", device) == -1)
1151 exit(ENOMEM);
1152
1153 target = _target;
1154 }
1155 } else if (anon_mount) {
1156 if (asprintf(&_target, "/mnt/%s", device) == -1)
1157 exit(ENOMEM);
1158
1159 target = _target;
1160 } else {
1161 /* No reason to mount this device */
1162 return 0;
1163 }
1164
1165 /* Mount the device */
1166
1167 if (check_fs)
1168 check_filesystem(pr);
1169
1170 mkdir_p(target, 0755);
1171 if (!lstat(target, &st) && S_ISLNK(st.st_mode))
1172 unlink(target);
1173
1174 err = handle_mount(pr->dev, target, pr->type, m);
1175 if (err) {
1176 ULOG_ERR("mounting %s (%s) as %s failed (%d) - %m\n",
1177 pr->dev, pr->type, target, errno);
1178
1179 if (_target)
1180 free(_target);
1181
1182 return err;
1183 }
1184
1185 if (_target)
1186 free(_target);
1187
1188 handle_swapfiles(true);
1189
1190 if (type != TYPE_AUTOFS)
1191 blockd_notify("mount", device, NULL, NULL);
1192
1193 return 0;
1194 }
1195
1196 static int umount_device(char *path, int type, bool all)
1197 {
1198 char *mp, *devpath;
1199 int err;
1200
1201 if (strlen(path) > 5 && !strncmp("/dev/", path, 5)) {
1202 mp = find_mount_point(path);
1203 } else {
1204 devpath = malloc(strlen(path) + 6);
1205 strcpy(devpath, "/dev/");
1206 strcat(devpath, path);
1207 mp = find_mount_point(devpath);
1208 free(devpath);
1209 }
1210
1211 if (!mp)
1212 return -1;
1213 if (!strcmp(mp, "/") && !all) {
1214 free(mp);
1215 return 0;
1216 }
1217 if (type != TYPE_AUTOFS)
1218 blockd_notify("umount", basename(path), NULL, NULL);
1219
1220 err = umount2(mp, MNT_DETACH);
1221 if (err) {
1222 ULOG_ERR("unmounting %s (%s) failed (%d) - %m\n", path, mp,
1223 errno);
1224 } else {
1225 ULOG_INFO("unmounted %s (%s)\n", path, mp);
1226 rmdir(mp);
1227 }
1228
1229 free(mp);
1230 return err;
1231 }
1232
1233 static int mount_action(char *action, char *device, int type)
1234 {
1235 char *path = NULL;
1236 struct probe_info *pr;
1237
1238 if (!action || !device)
1239 return -1;
1240
1241 if (!strcmp(action, "remove")) {
1242 if (type == TYPE_HOTPLUG)
1243 blockd_notify("hotplug", device, NULL, NULL);
1244
1245 umount_device(device, type, true);
1246
1247 return 0;
1248 } else if (strcmp(action, "add")) {
1249 ULOG_ERR("Unkown action %s\n", action);
1250
1251 return -1;
1252 }
1253
1254 if (config_load(NULL))
1255 return -1;
1256
1257 cache_load(1);
1258
1259 list_for_each_entry(pr, &devices, list)
1260 if (!strcmp(basename(pr->dev), device))
1261 path = pr->dev;
1262
1263 if (!path)
1264 return -1;
1265
1266 return mount_device(find_block_info(NULL, NULL, path), type);
1267 }
1268
1269 static int main_hotplug(int argc, char **argv)
1270 {
1271 return mount_action(getenv("ACTION"), getenv("DEVNAME"), TYPE_HOTPLUG);
1272 }
1273
1274 static int main_autofs(int argc, char **argv)
1275 {
1276 int err = 0;
1277
1278 if (argc < 3)
1279 return -1;
1280
1281 if (!strcmp(argv[2], "start")) {
1282 struct probe_info *pr;
1283
1284 if (config_load(NULL))
1285 return -1;
1286
1287 cache_load(1);
1288 list_for_each_entry(pr, &devices, list) {
1289 struct mount *m;
1290 char *mp;
1291
1292 if (!strcmp(pr->type, "swap"))
1293 continue;
1294
1295 m = find_block(pr->uuid, pr->label, NULL, NULL);
1296 if (m && m->extroot)
1297 continue;
1298
1299 blockd_notify("hotplug", pr->dev, m, pr);
1300 if ((!m || !m->autofs) && (mp = find_mount_point(pr->dev))) {
1301 blockd_notify("mount", pr->dev, NULL, NULL);
1302 free(mp);
1303 }
1304 }
1305 } else {
1306 if (argc < 4)
1307 return -EINVAL;
1308
1309 err = mount_action(argv[2], argv[3], TYPE_AUTOFS);
1310 }
1311
1312 if (err) {
1313 ULOG_ERR("autofs: \"%s\" action has failed: %d\n", argv[2], err);
1314 }
1315
1316 return err;
1317 }
1318
1319 static int find_block_mtd(char *name, char *part, int plen)
1320 {
1321 FILE *fp = fopen("/proc/mtd", "r");
1322 static char line[256];
1323 char *index = NULL;
1324
1325 if(!fp)
1326 return -1;
1327
1328 while (!index && fgets(line, sizeof(line), fp)) {
1329 if (strstr(line, name)) {
1330 char *eol = strstr(line, ":");
1331
1332 if (!eol)
1333 continue;
1334
1335 *eol = '\0';
1336 index = &line[3];
1337 }
1338 }
1339
1340 fclose(fp);
1341
1342 if (!index)
1343 return -1;
1344
1345 snprintf(part, plen, "/dev/mtdblock%s", index);
1346
1347 return 0;
1348 }
1349
1350 #ifdef UBIFS_EXTROOT
1351 static int find_ubi_vol(libubi_t libubi, char *name, int *dev_num, int *vol_id)
1352 {
1353 int dev = 0;
1354
1355 while (ubi_dev_present(libubi, dev))
1356 {
1357 struct ubi_dev_info dev_info;
1358 struct ubi_vol_info vol_info;
1359
1360 if (ubi_get_dev_info1(libubi, dev++, &dev_info))
1361 continue;
1362 if (ubi_get_vol_info1_nm(libubi, dev_info.dev_num, name, &vol_info))
1363 continue;
1364
1365 *dev_num = dev_info.dev_num;
1366 *vol_id = vol_info.vol_id;
1367
1368 return 0;
1369 }
1370
1371 return -1;
1372 }
1373
1374 static int find_block_ubi(libubi_t libubi, char *name, char *part, int plen)
1375 {
1376 int dev_num;
1377 int vol_id;
1378 int err = -1;
1379
1380 err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
1381 if (!err)
1382 snprintf(part, plen, "/dev/ubi%d_%d", dev_num, vol_id);
1383
1384 return err;
1385 }
1386
1387 static int find_block_ubi_RO(libubi_t libubi, char *name, char *part, int plen)
1388 {
1389 int dev_num;
1390 int vol_id;
1391 int err = -1;
1392
1393 err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
1394 if (!err)
1395 snprintf(part, plen, "/dev/ubiblock%d_%d", dev_num, vol_id);
1396
1397 return err;
1398 }
1399 #endif
1400
1401 static int find_dev(const char *path, char *buf, int len)
1402 {
1403 DIR *d;
1404 dev_t root;
1405 struct stat s;
1406 struct dirent *e;
1407
1408 if (stat(path, &s))
1409 return -1;
1410
1411 if (!(d = opendir("/dev")))
1412 return -1;
1413
1414 root = s.st_dev;
1415
1416 while ((e = readdir(d)) != NULL) {
1417 snprintf(buf, len, "/dev/%s", e->d_name);
1418
1419 if (stat(buf, &s) || s.st_rdev != root)
1420 continue;
1421
1422 closedir(d);
1423 return 0;
1424 }
1425
1426 closedir(d);
1427 return -1;
1428 }
1429
1430 static int find_root_dev(char *buf, int len)
1431 {
1432 int err = find_dev("/", buf, len);
1433 if (err)
1434 err = find_dev("/rom", buf, len);
1435
1436 return err;
1437 }
1438
1439 static int test_fs_support(const char *name)
1440 {
1441 char line[128], *p;
1442 int rv = -1;
1443 FILE *f;
1444
1445 if ((f = fopen("/proc/filesystems", "r")) != NULL) {
1446 while (fgets(line, sizeof(line), f)) {
1447 p = strtok(line, "\t\n");
1448
1449 if (p && !strcmp(p, "nodev"))
1450 p = strtok(NULL, "\t\n");
1451
1452 if (p && !strcmp(p, name)) {
1453 rv = 0;
1454 break;
1455 }
1456 }
1457 fclose(f);
1458 }
1459
1460 return rv;
1461 }
1462
1463 /**
1464 * Check if mounted partition is a valid extroot
1465 *
1466 * @path target mount point
1467 *
1468 * Valid extroot partition has to contain /etc/.extroot-uuid with UUID of root
1469 * device. This function reads UUID and verifies it OR writes UUID to
1470 * .extroot-uuid if it doesn't exist yet (first extroot usage).
1471 */
1472 static int check_extroot(char *path)
1473 {
1474 struct probe_info *pr = NULL;
1475 struct probe_info *tmp;
1476 struct stat s;
1477 char uuid[64] = { 0 };
1478 char devpath[32];
1479 char tag[64];
1480 FILE *fp;
1481 int err;
1482
1483 snprintf(tag, sizeof(tag), "%s/etc/.extroot-default", path);
1484 if (stat(tag, &s))
1485 return 0;
1486
1487 err = find_root_dev(devpath, sizeof(devpath));
1488 if (err)
1489 err = find_block_mtd("\"rootfs\"", devpath, sizeof(devpath));
1490 #ifdef UBIFS_EXTROOT
1491 if (err) {
1492 libubi_t libubi;
1493
1494 libubi = libubi_open();
1495 err = find_block_ubi_RO(libubi, "rootfs", devpath, sizeof(devpath));
1496 libubi_close(libubi);
1497 }
1498 #endif
1499 if (err) {
1500 ULOG_ERR("extroot: unable to determine root device\n");
1501 return -1;
1502 }
1503
1504 /* Find root device probe_info so we know its UUID */
1505 list_for_each_entry(tmp, &devices, list) {
1506 if (!strcmp(tmp->dev, devpath)) {
1507 pr = tmp;
1508 break;
1509 }
1510 }
1511 if (!pr) {
1512 ULOG_ERR("extroot: unable to lookup root device %s\n", devpath);
1513 return -1;
1514 }
1515
1516 snprintf(tag, sizeof(tag), "%s/etc", path);
1517 if (stat(tag, &s))
1518 mkdir_p(tag, 0755);
1519
1520 snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
1521 if (stat(tag, &s)) {
1522 fp = fopen(tag, "w+");
1523 if (!fp) {
1524 ULOG_ERR("extroot: failed to write UUID to %s: %d (%m)\n",
1525 tag, errno);
1526 /* return 0 to continue boot regardless of error */
1527 return 0;
1528 }
1529 fputs(pr->uuid, fp);
1530 fclose(fp);
1531 return 0;
1532 }
1533
1534 fp = fopen(tag, "r");
1535 if (!fp) {
1536 ULOG_ERR("extroot: failed to read UUID from %s: %d (%m)\n", tag,
1537 errno);
1538 return -1;
1539 }
1540
1541 if (!fgets(uuid, sizeof(uuid), fp))
1542 ULOG_ERR("extroot: failed to read UUID from %s: %d (%m)\n", tag,
1543 errno);
1544 fclose(fp);
1545
1546 if (*uuid && !strcasecmp(uuid, pr->uuid))
1547 return 0;
1548
1549 ULOG_ERR("extroot: UUID mismatch (root: %s, %s: %s)\n", pr->uuid,
1550 basename(path), uuid);
1551 return -1;
1552 }
1553
1554 /*
1555 * Read info about extroot from UCI (using prefix) and mount it.
1556 */
1557 static int mount_extroot(char *cfg)
1558 {
1559 char overlay[] = "/tmp/extroot/overlay";
1560 char mnt[] = "/tmp/extroot/mnt";
1561 char *path = mnt;
1562 struct probe_info *pr;
1563 struct mount *m;
1564 int err = -1;
1565
1566 /* Load @cfg/etc/config/fstab */
1567 if (config_load(cfg))
1568 return -2;
1569
1570 /* See if there is extroot-specific mount config */
1571 m = find_block(NULL, NULL, NULL, "/");
1572 if (!m)
1573 m = find_block(NULL, NULL, NULL, "/overlay");
1574
1575 if (!m || !m->extroot)
1576 {
1577 ULOG_INFO("extroot: not configured\n");
1578 return -1;
1579 }
1580
1581 /* Find block device pointed by the mount config */
1582 pr = find_block_info(m->uuid, m->label, m->device);
1583
1584 if (!pr && delay_root){
1585 ULOG_INFO("extroot: device not present, retrying in %u seconds\n", delay_root);
1586 sleep(delay_root);
1587 make_devs();
1588 cache_load(1);
1589 pr = find_block_info(m->uuid, m->label, m->device);
1590 }
1591 if (pr) {
1592 if (strncmp(pr->type, "ext", 3) &&
1593 strncmp(pr->type, "f2fs", 4) &&
1594 strncmp(pr->type, "btrfs", 5) &&
1595 strncmp(pr->type, "ntfs", 4) &&
1596 strncmp(pr->type, "ubifs", 5)) {
1597 ULOG_ERR("extroot: unsupported filesystem %s, try ext4, f2fs, btrfs, ntfs or ubifs\n", pr->type);
1598 return -1;
1599 }
1600
1601 if (test_fs_support(pr->type)) {
1602 ULOG_ERR("extroot: filesystem %s not supported by kernel\n", pr->type);
1603 return -1;
1604 }
1605
1606 if (m->overlay)
1607 path = overlay;
1608 mkdir_p(path, 0755);
1609
1610 if (check_fs)
1611 check_filesystem(pr);
1612
1613 err = mount(pr->dev, path, pr->type, m->flags,
1614 (m->options) ? (m->options) : (""));
1615
1616 if (err) {
1617 ULOG_ERR("extroot: mounting %s (%s) on %s failed: %d (%m)\n",
1618 pr->dev, pr->type, path, errno);
1619 } else if (m->overlay) {
1620 err = check_extroot(path);
1621 if (err)
1622 umount(path);
1623 }
1624 } else {
1625 ULOG_ERR("extroot: cannot find device %s%s\n",
1626 (m->uuid ? "with UUID " : (m->label ? "with label " : "")),
1627 (m->uuid ? m->uuid : (m->label ? m->label : m->device)));
1628 }
1629
1630 return err;
1631 }
1632
1633 /**
1634 * Look for extroot config and mount it if present
1635 *
1636 * Look for /etc/config/fstab on all supported partitions and use it for
1637 * mounting extroot if specified.
1638 */
1639 static int main_extroot(int argc, char **argv)
1640 {
1641 struct probe_info *pr;
1642 char blkdev_path[32] = { 0 };
1643 int err = -1;
1644 #ifdef UBIFS_EXTROOT
1645 libubi_t libubi;
1646 #endif
1647
1648 if (!getenv("PREINIT"))
1649 return -1;
1650
1651 if (argc != 2) {
1652 ULOG_ERR("Usage: block extroot\n");
1653 return -1;
1654 }
1655
1656 make_devs();
1657 cache_load(1);
1658
1659 /* enable LOG_INFO messages */
1660 ulog_threshold(LOG_INFO);
1661
1662 /* try the currently mounted overlay if exists */
1663 err = mount_extroot("/tmp/overlay");
1664 if (!err)
1665 return err;
1666
1667 /*
1668 * Look for "rootfs_data". We will want to mount it and check for
1669 * extroot configuration.
1670 */
1671
1672 /* Start with looking for MTD partition */
1673 find_block_mtd("\"rootfs_data\"", blkdev_path, sizeof(blkdev_path));
1674 if (blkdev_path[0]) {
1675 pr = find_block_info(NULL, NULL, blkdev_path);
1676 if (pr && !strcmp(pr->type, "jffs2")) {
1677 char cfg[] = "/tmp/jffs_cfg";
1678
1679 /*
1680 * Mount MTD part and try extroot (using
1681 * /etc/config/fstab from that partition)
1682 */
1683 mkdir_p(cfg, 0755);
1684 if (!mount(blkdev_path, cfg, "jffs2", MS_NOATIME, NULL)) {
1685 err = mount_extroot(cfg);
1686 umount2(cfg, MNT_DETACH);
1687 }
1688 if (err < 0)
1689 rmdir("/tmp/overlay");
1690 rmdir(cfg);
1691 return err;
1692 }
1693 }
1694
1695 #ifdef UBIFS_EXTROOT
1696 /* ... but it also could be an UBI volume */
1697 memset(blkdev_path, 0, sizeof(blkdev_path));
1698 libubi = libubi_open();
1699 find_block_ubi(libubi, "rootfs_data", blkdev_path, sizeof(blkdev_path));
1700 libubi_close(libubi);
1701 if (blkdev_path[0]) {
1702 char cfg[] = "/tmp/ubifs_cfg";
1703
1704 /* Mount volume and try extroot (using fstab from that vol) */
1705 mkdir_p(cfg, 0755);
1706 if (!mount(blkdev_path, cfg, "ubifs", MS_NOATIME, NULL)) {
1707 err = mount_extroot(cfg);
1708 umount2(cfg, MNT_DETACH);
1709 }
1710 if (err < 0)
1711 rmdir("/tmp/overlay");
1712 rmdir(cfg);
1713 return err;
1714 }
1715 #endif
1716
1717 /* As a last resort look for /etc/config/fstab on "rootfs" partition */
1718 return mount_extroot(NULL);
1719 }
1720
1721 static int main_mount(int argc, char **argv)
1722 {
1723 struct probe_info *pr;
1724
1725 if (config_load(NULL))
1726 return -1;
1727
1728 cache_load(1);
1729 list_for_each_entry(pr, &devices, list)
1730 mount_device(pr, TYPE_DEV);
1731
1732 handle_swapfiles(true);
1733
1734 return 0;
1735 }
1736
1737 static int main_umount(int argc, char **argv)
1738 {
1739 struct probe_info *pr;
1740 bool all = false;
1741
1742 if (config_load(NULL))
1743 return -1;
1744
1745 handle_swapfiles(false);
1746
1747 cache_load(1);
1748
1749 if (argc == 3)
1750 all = !strcmp(argv[2], "-a");
1751
1752 list_for_each_entry(pr, &devices, list) {
1753 struct mount *m;
1754
1755 if (!strcmp(pr->type, "swap"))
1756 continue;
1757
1758 m = find_block(pr->uuid, pr->label, basename(pr->dev), NULL);
1759 if (m && m->extroot)
1760 continue;
1761
1762 umount_device(pr->dev, TYPE_DEV, all);
1763 }
1764
1765 return 0;
1766 }
1767
1768 static int main_detect(int argc, char **argv)
1769 {
1770 struct probe_info *pr;
1771
1772 cache_load(0);
1773 printf("config 'global'\n");
1774 printf("\toption\tanon_swap\t'0'\n");
1775 printf("\toption\tanon_mount\t'0'\n");
1776 printf("\toption\tauto_swap\t'1'\n");
1777 printf("\toption\tauto_mount\t'1'\n");
1778 printf("\toption\tdelay_root\t'5'\n");
1779 printf("\toption\tcheck_fs\t'0'\n\n");
1780 list_for_each_entry(pr, &devices, list)
1781 print_block_uci(pr);
1782
1783 return 0;
1784 }
1785
1786 static int main_info(int argc, char **argv)
1787 {
1788 int i;
1789 struct probe_info *pr;
1790
1791 cache_load(1);
1792 if (argc == 2) {
1793 list_for_each_entry(pr, &devices, list)
1794 print_block_info(pr);
1795
1796 return 0;
1797 };
1798
1799 for (i = 2; i < argc; i++) {
1800 struct stat s;
1801
1802 if (stat(argv[i], &s)) {
1803 ULOG_ERR("failed to stat %s\n", argv[i]);
1804 continue;
1805 }
1806 if (!S_ISBLK(s.st_mode) && !(S_ISCHR(s.st_mode) && major(s.st_rdev) == 250)) {
1807 ULOG_ERR("%s is not a block device\n", argv[i]);
1808 continue;
1809 }
1810 pr = find_block_info(NULL, NULL, argv[i]);
1811 if (pr)
1812 print_block_info(pr);
1813 }
1814
1815 return 0;
1816 }
1817
1818 static int swapon_usage(void)
1819 {
1820 fprintf(stderr, "Usage: swapon [-s] [-a] [[-p pri] DEVICE]\n\n"
1821 "\tStart swapping on [DEVICE]\n"
1822 " -a\tStart swapping on all swap devices\n"
1823 " -p pri\tSet priority of swap device\n"
1824 " -s\tShow summary\n");
1825 return -1;
1826 }
1827
1828 static int main_swapon(int argc, char **argv)
1829 {
1830 int ch;
1831 FILE *fp;
1832 char *lineptr;
1833 size_t s;
1834 struct probe_info *pr;
1835 int flags = 0;
1836 int pri;
1837 struct stat st;
1838 int err;
1839
1840 while ((ch = getopt(argc, argv, "ap:s")) != -1) {
1841 switch(ch) {
1842 case 's':
1843 fp = fopen("/proc/swaps", "r");
1844 lineptr = NULL;
1845
1846 if (!fp) {
1847 ULOG_ERR("failed to open /proc/swaps\n");
1848 return -1;
1849 }
1850 while (getline(&lineptr, &s, fp) > 0)
1851 printf("%s", lineptr);
1852 if (lineptr)
1853 free(lineptr);
1854 fclose(fp);
1855 return 0;
1856 case 'a':
1857 cache_load(0);
1858 list_for_each_entry(pr, &devices, list) {
1859 if (strcmp(pr->type, "swap"))
1860 continue;
1861 if (swapon(pr->dev, 0))
1862 ULOG_ERR("failed to swapon %s\n", pr->dev);
1863 }
1864 return 0;
1865 case 'p':
1866 pri = atoi(optarg);
1867 if (pri >= 0)
1868 flags = ((pri << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
1869 break;
1870 default:
1871 return swapon_usage();
1872 }
1873 }
1874
1875 if (optind != (argc - 1))
1876 return swapon_usage();
1877
1878 if (stat(argv[optind], &st) || (!S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))) {
1879 ULOG_ERR("%s is not a block device or file\n", argv[optind]);
1880 return -1;
1881 }
1882 err = swapon(argv[optind], flags);
1883 if (err) {
1884 ULOG_ERR("failed to swapon %s (%d)\n", argv[optind], err);
1885 return err;
1886 }
1887
1888 return 0;
1889 }
1890
1891 static int main_swapoff(int argc, char **argv)
1892 {
1893 if (argc != 2) {
1894 ULOG_ERR("Usage: swapoff [-a] [DEVICE]\n\n"
1895 "\tStop swapping on DEVICE\n"
1896 " -a\tStop swapping on all swap devices\n");
1897 return -1;
1898 }
1899
1900 if (!strcmp(argv[1], "-a")) {
1901 FILE *fp = fopen("/proc/swaps", "r");
1902 char line[256];
1903
1904 if (!fp) {
1905 ULOG_ERR("failed to open /proc/swaps\n");
1906 return -1;
1907 }
1908 if (fgets(line, sizeof(line), fp))
1909 while (fgets(line, sizeof(line), fp)) {
1910 char *end = strchr(line, ' ');
1911 int err;
1912
1913 if (!end)
1914 continue;
1915 *end = '\0';
1916 err = swapoff(line);
1917 if (err)
1918 ULOG_ERR("failed to swapoff %s (%d)\n", line, err);
1919 }
1920 fclose(fp);
1921 } else {
1922 struct stat s;
1923 int err;
1924
1925 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1926 ULOG_ERR("%s is not a block device or file\n", argv[1]);
1927 return -1;
1928 }
1929 err = swapoff(argv[1]);
1930 if (err) {
1931 ULOG_ERR("failed to swapoff %s (%d)\n", argv[1], err);
1932 return err;
1933 }
1934 }
1935
1936 return 0;
1937 }
1938
1939 int main(int argc, char **argv)
1940 {
1941 char *base = basename(*argv);
1942
1943 umask(0);
1944
1945 ulog_open(-1, -1, "block");
1946 ulog_threshold(LOG_NOTICE);
1947
1948 if (!strcmp(base, "swapon"))
1949 return main_swapon(argc, argv);
1950
1951 if (!strcmp(base, "swapoff"))
1952 return main_swapoff(argc, argv);
1953
1954 if ((argc > 1) && !strcmp(base, "block")) {
1955 if (!strcmp(argv[1], "info"))
1956 return main_info(argc, argv);
1957
1958 if (!strcmp(argv[1], "detect"))
1959 return main_detect(argc, argv);
1960
1961 if (!strcmp(argv[1], "hotplug"))
1962 return main_hotplug(argc, argv);
1963
1964 if (!strcmp(argv[1], "autofs"))
1965 return main_autofs(argc, argv);
1966
1967 if (!strcmp(argv[1], "extroot"))
1968 return main_extroot(argc, argv);
1969
1970 if (!strcmp(argv[1], "mount"))
1971 return main_mount(argc, argv);
1972
1973 if (!strcmp(argv[1], "umount"))
1974 return main_umount(argc, argv);
1975
1976 if (!strcmp(argv[1], "remount")) {
1977 int ret = main_umount(argc, argv);
1978
1979 if (!ret)
1980 ret = main_mount(argc, argv);
1981 return ret;
1982 }
1983 }
1984
1985 ULOG_ERR("Usage: block <info|mount|umount|detect>\n");
1986
1987 return -1;
1988 }
OpenWrt filesystem utilities