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block: support umount device basename
[project/fstools.git] / block.c
1 /*
2 * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
3 * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU Lesser General Public License version 2.1
7 * as published by the Free Software Foundation
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14
15 #define _GNU_SOURCE
16 #include <getopt.h>
17 #include <stdio.h>
18 #include <unistd.h>
19 #include <syslog.h>
20 #include <libgen.h>
21 #include <glob.h>
22 #include <dirent.h>
23 #include <stdarg.h>
24 #include <string.h>
25 #include <errno.h>
26 #include <fcntl.h>
27 #include <limits.h>
28
29 #include <sys/stat.h>
30 #include <sys/types.h>
31 #include <sys/swap.h>
32 #include <sys/mount.h>
33 #include <sys/wait.h>
34 #include <sys/sysmacros.h>
35
36 #include <linux/fs.h>
37
38 #include <uci.h>
39 #include <uci_blob.h>
40
41 #include <libubox/avl-cmp.h>
42 #include <libubox/blobmsg_json.h>
43 #include <libubox/list.h>
44 #include <libubox/ulog.h>
45 #include <libubox/utils.h>
46 #include <libubox/vlist.h>
47 #include <libubus.h>
48
49 #include "probe.h"
50
51 #define AUTOFS_MOUNT_PATH "/tmp/run/blockd/"
52
53 #ifdef UBIFS_EXTROOT
54 #include "libubi/libubi.h"
55 #endif
56
57 enum {
58 TYPE_MOUNT,
59 TYPE_SWAP,
60 };
61
62 enum {
63 TYPE_DEV,
64 TYPE_HOTPLUG,
65 TYPE_AUTOFS,
66 };
67
68 struct mount {
69 struct vlist_node node;
70 int type;
71
72 char *target;
73 char *path;
74 char *options;
75 uint32_t flags;
76 char *uuid;
77 char *label;
78 char *device;
79 int extroot;
80 int autofs;
81 int overlay;
82 int disabled_fsck;
83 unsigned int prio;
84 };
85
86 static struct vlist_tree mounts;
87 static struct blob_buf b;
88 static LIST_HEAD(devices);
89 static int anon_mount, anon_swap, auto_mount, auto_swap, check_fs;
90 static unsigned int delay_root;
91
92 enum {
93 CFG_ANON_MOUNT,
94 CFG_ANON_SWAP,
95 CFG_AUTO_MOUNT,
96 CFG_AUTO_SWAP,
97 CFG_DELAY_ROOT,
98 CFG_CHECK_FS,
99 __CFG_MAX
100 };
101
102 static const struct blobmsg_policy config_policy[__CFG_MAX] = {
103 [CFG_ANON_SWAP] = { .name = "anon_swap", .type = BLOBMSG_TYPE_INT32 },
104 [CFG_ANON_MOUNT] = { .name = "anon_mount", .type = BLOBMSG_TYPE_INT32 },
105 [CFG_AUTO_SWAP] = { .name = "auto_swap", .type = BLOBMSG_TYPE_INT32 },
106 [CFG_AUTO_MOUNT] = { .name = "auto_mount", .type = BLOBMSG_TYPE_INT32 },
107 [CFG_DELAY_ROOT] = { .name = "delay_root", .type = BLOBMSG_TYPE_INT32 },
108 [CFG_CHECK_FS] = { .name = "check_fs", .type = BLOBMSG_TYPE_INT32 },
109 };
110
111 enum {
112 MOUNT_UUID,
113 MOUNT_LABEL,
114 MOUNT_ENABLE,
115 MOUNT_TARGET,
116 MOUNT_DEVICE,
117 MOUNT_OPTIONS,
118 MOUNT_AUTOFS,
119 __MOUNT_MAX
120 };
121
122 static const struct uci_blob_param_list config_attr_list = {
123 .n_params = __CFG_MAX,
124 .params = config_policy,
125 };
126
127 static const struct blobmsg_policy mount_policy[__MOUNT_MAX] = {
128 [MOUNT_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
129 [MOUNT_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
130 [MOUNT_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
131 [MOUNT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
132 [MOUNT_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_STRING },
133 [MOUNT_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
134 [MOUNT_AUTOFS] = { .name = "autofs", .type = BLOBMSG_TYPE_INT32 },
135 };
136
137 static const struct uci_blob_param_list mount_attr_list = {
138 .n_params = __MOUNT_MAX,
139 .params = mount_policy,
140 };
141
142 enum {
143 SWAP_ENABLE,
144 SWAP_UUID,
145 SWAP_LABEL,
146 SWAP_DEVICE,
147 SWAP_PRIO,
148 __SWAP_MAX
149 };
150
151 static const struct blobmsg_policy swap_policy[__SWAP_MAX] = {
152 [SWAP_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
153 [SWAP_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
154 [SWAP_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
155 [SWAP_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
156 [SWAP_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 },
157 };
158
159 static const struct uci_blob_param_list swap_attr_list = {
160 .n_params = __SWAP_MAX,
161 .params = swap_policy,
162 };
163
164 struct mount_flag {
165 const char *name;
166 int32_t flag;
167 };
168
169 static const struct mount_flag mount_flags[] = {
170 { "sync", MS_SYNCHRONOUS },
171 { "async", ~MS_SYNCHRONOUS },
172 { "dirsync", MS_DIRSYNC },
173 { "mand", MS_MANDLOCK },
174 { "nomand", ~MS_MANDLOCK },
175 { "atime", ~MS_NOATIME },
176 { "noatime", MS_NOATIME },
177 { "dev", ~MS_NODEV },
178 { "nodev", MS_NODEV },
179 { "diratime", ~MS_NODIRATIME },
180 { "nodiratime", MS_NODIRATIME },
181 { "exec", ~MS_NOEXEC },
182 { "noexec", MS_NOEXEC },
183 { "suid", ~MS_NOSUID },
184 { "nosuid", MS_NOSUID },
185 { "rw", ~MS_RDONLY },
186 { "ro", MS_RDONLY },
187 { "relatime", MS_RELATIME },
188 { "norelatime", ~MS_RELATIME },
189 { "strictatime", MS_STRICTATIME },
190 { "acl", MS_POSIXACL },
191 { "noacl", ~MS_POSIXACL },
192 { "nouser_xattr", MS_NOUSER },
193 { "user_xattr", ~MS_NOUSER },
194 };
195
196 static char *blobmsg_get_strdup(struct blob_attr *attr)
197 {
198 if (!attr)
199 return NULL;
200
201 return strdup(blobmsg_get_string(attr));
202 }
203
204 static char *blobmsg_get_basename(struct blob_attr *attr)
205 {
206 if (!attr)
207 return NULL;
208
209 return strdup(basename(blobmsg_get_string(attr)));
210 }
211
212 static void parse_mount_options(struct mount *m, char *optstr)
213 {
214 int i;
215 bool is_flag;
216 char *p, *opts, *last;
217
218 m->flags = 0;
219 m->options = NULL;
220
221 if (!optstr || !*optstr)
222 return;
223
224 m->options = opts = calloc(1, strlen(optstr) + 1);
225
226 if (!m->options)
227 return;
228
229 p = last = optstr;
230
231 do {
232 p = strchr(p, ',');
233
234 if (p)
235 *p++ = 0;
236
237 for (i = 0, is_flag = false; i < ARRAY_SIZE(mount_flags); i++) {
238 if (!strcmp(last, mount_flags[i].name)) {
239 if (mount_flags[i].flag < 0)
240 m->flags &= (uint32_t)mount_flags[i].flag;
241 else
242 m->flags |= (uint32_t)mount_flags[i].flag;
243 is_flag = true;
244 break;
245 }
246 }
247
248 if (!is_flag)
249 opts += sprintf(opts, "%s%s", (opts > m->options) ? "," : "", last);
250
251 last = p;
252
253 } while (p);
254
255 free(optstr);
256 }
257
258 static int mount_add(struct uci_section *s)
259 {
260 struct blob_attr *tb[__MOUNT_MAX] = { 0 };
261 struct mount *m;
262
263 blob_buf_init(&b, 0);
264 uci_to_blob(&b, s, &mount_attr_list);
265 blobmsg_parse(mount_policy, __MOUNT_MAX, tb, blob_data(b.head), blob_len(b.head));
266
267 if (!tb[MOUNT_LABEL] && !tb[MOUNT_UUID] && !tb[MOUNT_DEVICE])
268 return -1;
269
270 if (tb[MOUNT_ENABLE] && !blobmsg_get_u32(tb[MOUNT_ENABLE]))
271 return -1;
272
273 m = malloc(sizeof(struct mount));
274 m->type = TYPE_MOUNT;
275 m->uuid = blobmsg_get_strdup(tb[MOUNT_UUID]);
276 m->label = blobmsg_get_strdup(tb[MOUNT_LABEL]);
277 m->target = blobmsg_get_strdup(tb[MOUNT_TARGET]);
278 m->device = blobmsg_get_basename(tb[MOUNT_DEVICE]);
279 if (tb[MOUNT_AUTOFS])
280 m->autofs = blobmsg_get_u32(tb[MOUNT_AUTOFS]);
281 else
282 m->autofs = 0;
283 parse_mount_options(m, blobmsg_get_strdup(tb[MOUNT_OPTIONS]));
284
285 m->overlay = m->extroot = 0;
286 if (m->target && !strcmp(m->target, "/"))
287 m->extroot = 1;
288 if (m->target && !strcmp(m->target, "/overlay"))
289 m->extroot = m->overlay = 1;
290
291 if (m->target && *m->target != '/') {
292 ULOG_WARN("ignoring mount section %s due to invalid target '%s'\n",
293 s->e.name, m->target);
294 free(m);
295 return -1;
296 }
297
298 if (m->uuid)
299 vlist_add(&mounts, &m->node, m->uuid);
300 else if (m->label)
301 vlist_add(&mounts, &m->node, m->label);
302 else if (m->device)
303 vlist_add(&mounts, &m->node, m->device);
304
305 return 0;
306 }
307
308 static int swap_add(struct uci_section *s)
309 {
310 struct blob_attr *tb[__SWAP_MAX] = { 0 };
311 struct mount *m;
312
313 blob_buf_init(&b, 0);
314 uci_to_blob(&b, s, &swap_attr_list);
315 blobmsg_parse(swap_policy, __SWAP_MAX, tb, blob_data(b.head), blob_len(b.head));
316
317 if (!tb[SWAP_UUID] && !tb[SWAP_LABEL] && !tb[SWAP_DEVICE])
318 return -1;
319
320 m = malloc(sizeof(struct mount));
321 memset(m, 0, sizeof(struct mount));
322 m->type = TYPE_SWAP;
323 m->uuid = blobmsg_get_strdup(tb[SWAP_UUID]);
324 m->label = blobmsg_get_strdup(tb[SWAP_LABEL]);
325 m->device = blobmsg_get_basename(tb[SWAP_DEVICE]);
326 if (tb[SWAP_PRIO])
327 m->prio = blobmsg_get_u32(tb[SWAP_PRIO]);
328 if (m->prio)
329 m->prio = ((m->prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
330
331 if ((!tb[SWAP_ENABLE]) || blobmsg_get_u32(tb[SWAP_ENABLE])) {
332 /* store complete swap path */
333 if (tb[SWAP_DEVICE])
334 m->target = blobmsg_get_strdup(tb[SWAP_DEVICE]);
335
336 if (m->uuid)
337 vlist_add(&mounts, &m->node, m->uuid);
338 else if (m->label)
339 vlist_add(&mounts, &m->node, m->label);
340 else if (m->device)
341 vlist_add(&mounts, &m->node, m->device);
342 }
343
344 return 0;
345 }
346
347 static int global_add(struct uci_section *s)
348 {
349 struct blob_attr *tb[__CFG_MAX] = { 0 };
350
351 blob_buf_init(&b, 0);
352 uci_to_blob(&b, s, &config_attr_list);
353 blobmsg_parse(config_policy, __CFG_MAX, tb, blob_data(b.head), blob_len(b.head));
354
355 if ((tb[CFG_ANON_MOUNT]) && blobmsg_get_u32(tb[CFG_ANON_MOUNT]))
356 anon_mount = 1;
357 if ((tb[CFG_ANON_SWAP]) && blobmsg_get_u32(tb[CFG_ANON_SWAP]))
358 anon_swap = 1;
359
360 if ((tb[CFG_AUTO_MOUNT]) && blobmsg_get_u32(tb[CFG_AUTO_MOUNT]))
361 auto_mount = 1;
362 if ((tb[CFG_AUTO_SWAP]) && blobmsg_get_u32(tb[CFG_AUTO_SWAP]))
363 auto_swap = 1;
364
365 if (tb[CFG_DELAY_ROOT])
366 delay_root = blobmsg_get_u32(tb[CFG_DELAY_ROOT]);
367
368 if ((tb[CFG_CHECK_FS]) && blobmsg_get_u32(tb[CFG_CHECK_FS]))
369 check_fs = 1;
370
371 return 0;
372 }
373
374 static struct mount* find_swap(const char *uuid, const char *label, const char *device)
375 {
376 struct mount *m;
377
378 vlist_for_each_element(&mounts, m, node) {
379 if (m->type != TYPE_SWAP)
380 continue;
381 if (uuid && m->uuid && !strcasecmp(m->uuid, uuid))
382 return m;
383 if (label && m->label && !strcmp(m->label, label))
384 return m;
385 if (device && m->device && !strcmp(m->device, device))
386 return m;
387 }
388
389 return NULL;
390 }
391
392 static struct mount* find_block(const char *uuid, const char *label, const char *device,
393 const char *target)
394 {
395 struct mount *m;
396
397 vlist_for_each_element(&mounts, m, node) {
398 if (m->type != TYPE_MOUNT)
399 continue;
400 if (m->uuid && uuid && !strcasecmp(m->uuid, uuid))
401 return m;
402 if (m->label && label && !strcmp(m->label, label))
403 return m;
404 if (m->target && target && !strcmp(m->target, target))
405 return m;
406 if (m->device && device && !strcmp(m->device, device))
407 return m;
408 }
409
410 return NULL;
411 }
412
413 static void mounts_update(struct vlist_tree *tree, struct vlist_node *node_new,
414 struct vlist_node *node_old)
415 {
416 }
417
418 static struct uci_package * config_try_load(struct uci_context *ctx, char *path)
419 {
420 char *file = basename(path);
421 char *dir = dirname(path);
422 char *err;
423 struct uci_package *pkg;
424
425 uci_set_confdir(ctx, dir);
426 ULOG_INFO("attempting to load %s/%s\n", dir, file);
427
428 if (uci_load(ctx, file, &pkg)) {
429 uci_get_errorstr(ctx, &err, file);
430 ULOG_ERR("unable to load configuration (%s)\n", err);
431
432 free(err);
433 return NULL;
434 }
435
436 return pkg;
437 }
438
439 static int config_load(char *cfg)
440 {
441 struct uci_context *ctx = uci_alloc_context();
442 struct uci_package *pkg = NULL;
443 struct uci_element *e;
444 char path[64];
445
446 vlist_init(&mounts, avl_strcmp, mounts_update);
447
448 if (cfg) {
449 snprintf(path, sizeof(path), "%s/upper/etc/config/fstab", cfg);
450 pkg = config_try_load(ctx, path);
451
452 if (!pkg) {
453 snprintf(path, sizeof(path), "%s/etc/config/fstab", cfg);
454 pkg = config_try_load(ctx, path);
455 }
456 }
457
458 if (!pkg) {
459 snprintf(path, sizeof(path), "/etc/config/fstab");
460 pkg = config_try_load(ctx, path);
461 }
462
463 if (!pkg) {
464 ULOG_ERR("no usable configuration\n");
465 return -1;
466 }
467
468 vlist_update(&mounts);
469 uci_foreach_element(&pkg->sections, e) {
470 struct uci_section *s = uci_to_section(e);
471
472 if (!strcmp(s->type, "mount"))
473 mount_add(s);
474 if (!strcmp(s->type, "swap"))
475 swap_add(s);
476 if (!strcmp(s->type, "global"))
477 global_add(s);
478 }
479 vlist_flush(&mounts);
480
481 return 0;
482 }
483
484 static struct probe_info* _probe_path(char *path)
485 {
486 struct probe_info *pr;
487 char tmppath[64];
488
489 /* skip ubi device if ubiblock device is present */
490 if (path[5] == 'u' && path[6] == 'b' && path[7] == 'i' &&
491 path[8] >= '0' && path[8] <= '9' ) {
492 snprintf(tmppath, sizeof(tmppath), "/dev/ubiblock%s", path + 8);
493 list_for_each_entry(pr, &devices, list)
494 if (!strcasecmp(pr->dev, tmppath))
495 return NULL;
496 }
497
498 return probe_path(path);
499 }
500
501 static int _cache_load(const char *path)
502 {
503 int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
504 int j;
505 glob_t gl;
506
507 if (glob(path, gl_flags, NULL, &gl) < 0)
508 return -1;
509
510 for (j = 0; j < gl.gl_pathc; j++) {
511 struct probe_info *pr = _probe_path(gl.gl_pathv[j]);
512 if (pr)
513 list_add_tail(&pr->list, &devices);
514 }
515
516 globfree(&gl);
517
518 return 0;
519 }
520
521 static void cache_load(int mtd)
522 {
523 if (mtd) {
524 _cache_load("/dev/mtdblock*");
525 _cache_load("/dev/ubiblock*");
526 _cache_load("/dev/ubi[0-9]*");
527 }
528 _cache_load("/dev/loop*");
529 _cache_load("/dev/mmcblk*");
530 _cache_load("/dev/sd*");
531 _cache_load("/dev/hd*");
532 _cache_load("/dev/md*");
533 _cache_load("/dev/nvme*");
534 _cache_load("/dev/vd*");
535 _cache_load("/dev/xvd*");
536 _cache_load("/dev/dm-*");
537 }
538
539
540 static struct probe_info* find_block_info(char *uuid, char *label, char *path)
541 {
542 struct probe_info *pr = NULL;
543
544 if (uuid)
545 list_for_each_entry(pr, &devices, list)
546 if (pr->uuid && !strcasecmp(pr->uuid, uuid))
547 return pr;
548
549 if (label)
550 list_for_each_entry(pr, &devices, list)
551 if (pr->label && !strcmp(pr->label, label))
552 return pr;
553
554 if (path)
555 list_for_each_entry(pr, &devices, list)
556 if (pr->dev && !strcmp(basename(pr->dev), basename(path)))
557 return pr;
558
559 return NULL;
560 }
561
562 static char* find_mount_point(char *block)
563 {
564 FILE *fp = fopen("/proc/self/mountinfo", "r");
565 static char line[256];
566 char *point = NULL, *pos, *tmp, *cpoint, *devname;
567 struct stat s;
568 int rstat;
569 unsigned int minor, major;
570
571 if (!fp)
572 return NULL;
573
574 rstat = stat(block, &s);
575
576 while (fgets(line, sizeof(line), fp)) {
577 pos = strchr(line, ' ');
578 if (!pos)
579 continue;
580
581 pos = strchr(pos + 1, ' ');
582 if (!pos)
583 continue;
584
585 tmp = ++pos;
586 pos = strchr(pos, ':');
587 if (!pos)
588 continue;
589
590 *pos = '\0';
591 major = atoi(tmp);
592 tmp = ++pos;
593 pos = strchr(pos, ' ');
594 if (!pos)
595 continue;
596
597 *pos = '\0';
598 minor = atoi(tmp);
599 pos = strchr(pos + 1, ' ');
600 if (!pos)
601 continue;
602 tmp = ++pos;
603
604 pos = strchr(pos, ' ');
605 if (!pos)
606 continue;
607 *pos = '\0';
608 cpoint = tmp;
609
610 pos = strchr(pos + 1, ' ');
611 if (!pos)
612 continue;
613
614 pos = strchr(pos + 1, ' ');
615 if (!pos)
616 continue;
617
618 pos = strchr(pos + 1, ' ');
619 if (!pos)
620 continue;
621
622 tmp = ++pos;
623 pos = strchr(pos, ' ');
624 if (!pos)
625 continue;
626
627 *pos = '\0';
628 devname = tmp;
629 if (!strcmp(block, devname)) {
630 point = strdup(cpoint);
631 break;
632 }
633
634 if (rstat)
635 continue;
636
637 if (!S_ISBLK(s.st_mode))
638 continue;
639
640 if (major == major(s.st_rdev) &&
641 minor == minor(s.st_rdev)) {
642 point = strdup(cpoint);
643 break;
644 }
645 }
646
647 fclose(fp);
648
649 return point;
650 }
651
652 static int print_block_uci(struct probe_info *pr)
653 {
654 if (!strcmp(pr->type, "swap")) {
655 printf("config 'swap'\n");
656 } else {
657 char *mp = find_mount_point(pr->dev);
658
659 printf("config 'mount'\n");
660 if (mp) {
661 printf("\toption\ttarget\t'%s'\n", mp);
662 free(mp);
663 } else {
664 printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev));
665 }
666 }
667 if (pr->uuid)
668 printf("\toption\tuuid\t'%s'\n", pr->uuid);
669 else
670 printf("\toption\tdevice\t'%s'\n", pr->dev);
671 printf("\toption\tenabled\t'0'\n\n");
672
673 return 0;
674 }
675
676 static int print_block_info(struct probe_info *pr)
677 {
678 static char *mp;
679
680 mp = find_mount_point(pr->dev);
681 printf("%s:", pr->dev);
682 if (pr->uuid)
683 printf(" UUID=\"%s\"", pr->uuid);
684
685 if (pr->label)
686 printf(" LABEL=\"%s\"", pr->label);
687
688 if (pr->version)
689 printf(" VERSION=\"%s\"", pr->version);
690
691 if (mp) {
692 printf(" MOUNT=\"%s\"", mp);
693 free(mp);
694 }
695
696 printf(" TYPE=\"%s\"\n", pr->type);
697
698 return 0;
699 }
700
701 static void check_filesystem(struct probe_info *pr)
702 {
703 pid_t pid;
704 struct stat statbuf;
705 const char *e2fsck = "/usr/sbin/e2fsck";
706 const char *f2fsck = "/usr/sbin/fsck.f2fs";
707 const char *fatfsck = "/usr/sbin/fsck.fat";
708 const char *btrfsck = "/usr/bin/btrfsck";
709 const char *ntfsck = "/usr/bin/ntfsfix";
710 const char *ckfs;
711
712 /* UBIFS does not need stuff like fsck */
713 if (!strncmp(pr->type, "ubifs", 5))
714 return;
715
716 if (!strncmp(pr->type, "vfat", 4)) {
717 ckfs = fatfsck;
718 } else if (!strncmp(pr->type, "f2fs", 4)) {
719 ckfs = f2fsck;
720 } else if (!strncmp(pr->type, "ext", 3)) {
721 ckfs = e2fsck;
722 } else if (!strncmp(pr->type, "btrfs", 5)) {
723 ckfs = btrfsck;
724 } else if (!strncmp(pr->type, "ntfs", 4)) {
725 ckfs = ntfsck;
726 } else {
727 ULOG_ERR("check_filesystem: %s is not supported\n", pr->type);
728 return;
729 }
730
731 if (stat(ckfs, &statbuf) < 0) {
732 ULOG_ERR("check_filesystem: %s not found\n", ckfs);
733 return;
734 }
735
736 pid = fork();
737 if (!pid) {
738 if(!strncmp(pr->type, "f2fs", 4)) {
739 execl(ckfs, ckfs, "-f", pr->dev, NULL);
740 exit(EXIT_FAILURE);
741 } else if(!strncmp(pr->type, "btrfs", 5)) {
742 execl(ckfs, ckfs, "--repair", pr->dev, NULL);
743 exit(EXIT_FAILURE);
744 } else if(!strncmp(pr->type, "ntfs", 4)) {
745 execl(ckfs, ckfs, "-b", pr->dev, NULL);
746 exit(EXIT_FAILURE);
747 } else {
748 execl(ckfs, ckfs, "-p", pr->dev, NULL);
749 exit(EXIT_FAILURE);
750 }
751 } else if (pid > 0) {
752 int status;
753
754 waitpid(pid, &status, 0);
755 if (WIFEXITED(status) && WEXITSTATUS(status))
756 ULOG_ERR("check_filesystem: %s returned %d\n", ckfs, WEXITSTATUS(status));
757 if (WIFSIGNALED(status))
758 ULOG_ERR("check_filesystem: %s terminated by %s\n", ckfs, strsignal(WTERMSIG(status)));
759 }
760 }
761
762 static void handle_swapfiles(bool on)
763 {
764 struct stat s;
765 struct mount *m;
766 struct probe_info *pr;
767
768 vlist_for_each_element(&mounts, m, node)
769 {
770 if (m->type != TYPE_SWAP || !m->target)
771 continue;
772
773 if (stat(m->target, &s) || !S_ISREG(s.st_mode))
774 continue;
775
776 pr = _probe_path(m->target);
777
778 if (!pr)
779 continue;
780
781 if (!strcmp(pr->type, "swap")) {
782 if (on)
783 swapon(pr->dev, m->prio);
784 else
785 swapoff(pr->dev);
786 }
787
788 free(pr);
789 }
790 }
791
792 static void to_devnull(int fd)
793 {
794 int devnull = open("/dev/null", fd ? O_WRONLY : O_RDONLY);
795
796 if (devnull >= 0)
797 dup2(devnull, fd);
798
799 if (devnull > STDERR_FILENO)
800 close(devnull);
801 }
802
803 static int exec_mount(const char *source, const char *target,
804 const char *fstype, const char *options)
805 {
806 pid_t pid;
807 struct stat s;
808 FILE *mount_fd;
809 int err, status, pfds[2];
810 char errmsg[128], cmd[sizeof("/sbin/mount.XXXXXXXXXXXXXXXX\0")];
811
812 snprintf(cmd, sizeof(cmd), "/sbin/mount.%s", fstype);
813
814 if (stat(cmd, &s) < 0 || !S_ISREG(s.st_mode) || !(s.st_mode & S_IXUSR)) {
815 ULOG_ERR("No \"mount.%s\" utility available\n", fstype);
816 return -1;
817 }
818
819 if (pipe(pfds) < 0)
820 return -1;
821
822 fcntl(pfds[0], F_SETFD, fcntl(pfds[0], F_GETFD) | FD_CLOEXEC);
823 fcntl(pfds[1], F_SETFD, fcntl(pfds[1], F_GETFD) | FD_CLOEXEC);
824
825 pid = vfork();
826
827 switch (pid) {
828 case -1:
829 close(pfds[0]);
830 close(pfds[1]);
831
832 return -1;
833
834 case 0:
835 to_devnull(STDIN_FILENO);
836 to_devnull(STDOUT_FILENO);
837
838 dup2(pfds[1], STDERR_FILENO);
839 close(pfds[0]);
840 close(pfds[1]);
841
842 if (options && *options)
843 execl(cmd, cmd, "-o", options, source, target, NULL);
844 else
845 execl(cmd, cmd, source, target, NULL);
846
847 return -1;
848
849 default:
850 close(pfds[1]);
851
852 mount_fd = fdopen(pfds[0], "r");
853
854 while (fgets(errmsg, sizeof(errmsg), mount_fd))
855 ULOG_ERR("mount.%s: %s", fstype, errmsg);
856
857 fclose(mount_fd);
858
859 err = waitpid(pid, &status, 0);
860
861 if (err != -1) {
862 if (status != 0) {
863 ULOG_ERR("mount.%s: failed with status %d\n", fstype, status);
864 errno = EINVAL;
865 err = -1;
866 } else {
867 errno = 0;
868 err = 0;
869 }
870 }
871
872 break;
873 }
874
875 return err;
876 }
877
878 static int handle_mount(const char *source, const char *target,
879 const char *fstype, struct mount *m)
880 {
881 int i, err;
882 size_t mount_opts_len;
883 char *mount_opts = NULL, *ptr;
884
885 err = mount(source, target, fstype, m ? m->flags : 0,
886 (m && m->options) ? m->options : "");
887
888 /* Requested file system type is not available in kernel,
889 attempt to call mount helper. */
890 if (err == -1 && errno == ENODEV) {
891 if (m) {
892 /* Convert mount flags back into string representation,
893 first calculate needed length of string buffer... */
894 mount_opts_len = 1 + (m->options ? strlen(m->options) : 0);
895
896 for (i = 0; i < ARRAY_SIZE(mount_flags); i++)
897 if ((mount_flags[i].flag > 0) &&
898 (mount_flags[i].flag < INT_MAX) &&
899 (m->flags & (uint32_t)mount_flags[i].flag))
900 mount_opts_len += strlen(mount_flags[i].name) + 1;
901
902 /* ... then now allocate and fill it ... */
903 ptr = mount_opts = calloc(1, mount_opts_len);
904
905 if (!ptr) {
906 errno = ENOMEM;
907 return -1;
908 }
909
910 if (m->options)
911 ptr += sprintf(ptr, "%s,", m->options);
912
913 for (i = 0; i < ARRAY_SIZE(mount_flags); i++)
914 if ((mount_flags[i].flag > 0) &&
915 (mount_flags[i].flag < INT_MAX) &&
916 (m->flags & (uint32_t)mount_flags[i].flag))
917 ptr += sprintf(ptr, "%s,", mount_flags[i].name);
918
919 mount_opts[mount_opts_len - 1] = 0;
920 }
921
922 /* ... and now finally invoke the external mount program */
923 err = exec_mount(source, target, fstype, mount_opts);
924 }
925
926 return err;
927 }
928
929 static int blockd_notify(const char *method, char *device, struct mount *m,
930 struct probe_info *pr)
931 {
932 struct ubus_context *ctx = ubus_connect(NULL);
933 uint32_t id;
934 int err;
935
936 if (!ctx)
937 return -ENXIO;
938
939 if (!ubus_lookup_id(ctx, "block", &id)) {
940 struct blob_buf buf = { 0 };
941 char *d = strrchr(device, '/');
942
943 if (d)
944 d++;
945 else
946 d = device;
947
948 blob_buf_init(&buf, 0);
949
950 if (m) {
951
952 blobmsg_add_string(&buf, "device", d);
953 if (m->uuid)
954 blobmsg_add_string(&buf, "uuid", m->uuid);
955 if (m->label)
956 blobmsg_add_string(&buf, "label", m->label);
957 if (m->target)
958 blobmsg_add_string(&buf, "target", m->target);
959 if (m->options)
960 blobmsg_add_string(&buf, "options", m->options);
961 if (m->autofs)
962 blobmsg_add_u32(&buf, "autofs", m->autofs);
963 if (pr->type)
964 blobmsg_add_string(&buf, "type", pr->type);
965 if (pr->version)
966 blobmsg_add_string(&buf, "version", pr->version);
967 } else if (pr) {
968 blobmsg_add_string(&buf, "device", d);
969 if (pr->uuid)
970 blobmsg_add_string(&buf, "uuid", pr->uuid);
971 if (pr->label)
972 blobmsg_add_string(&buf, "label", pr->label);
973 if (pr->type)
974 blobmsg_add_string(&buf, "type", pr->type);
975 if (pr->version)
976 blobmsg_add_string(&buf, "version", pr->version);
977 blobmsg_add_u32(&buf, "anon", 1);
978 } else {
979 blobmsg_add_string(&buf, "device", d);
980 blobmsg_add_u32(&buf, "remove", 1);
981 }
982
983 err = ubus_invoke(ctx, id, method, buf.head, NULL, NULL, 3000);
984 } else {
985 err = -ENOENT;
986 }
987
988 ubus_free(ctx);
989
990 return err;
991 }
992
993 static int mount_device(struct probe_info *pr, int type)
994 {
995 struct mount *m;
996 struct stat st;
997 char *_target = NULL;
998 char *target;
999 char *device;
1000 char *mp;
1001 int err;
1002
1003 if (!pr)
1004 return -1;
1005
1006 device = basename(pr->dev);
1007
1008 if (!strcmp(pr->type, "swap")) {
1009 if ((type == TYPE_HOTPLUG) && !auto_swap)
1010 return -1;
1011 m = find_swap(pr->uuid, pr->label, device);
1012 if (m || anon_swap)
1013 swapon(pr->dev, (m) ? (m->prio) : (0));
1014
1015 return 0;
1016 }
1017
1018 m = find_block(pr->uuid, pr->label, device, NULL);
1019 if (m && m->extroot)
1020 return -1;
1021
1022 mp = find_mount_point(pr->dev);
1023 if (mp) {
1024 if (m && m->type == TYPE_MOUNT && m->target && strcmp(m->target, mp)) {
1025 ULOG_ERR("%s is already mounted on %s\n", pr->dev, mp);
1026 err = -1;
1027 } else
1028 err = 0;
1029 free(mp);
1030 return err;
1031 }
1032
1033 if (type == TYPE_HOTPLUG)
1034 blockd_notify("hotplug", device, m, pr);
1035
1036 /* Check if device should be mounted & set the target directory */
1037 if (m) {
1038 switch (type) {
1039 case TYPE_HOTPLUG:
1040 if (m->autofs)
1041 return 0;
1042 if (!auto_mount)
1043 return -1;
1044 break;
1045 case TYPE_AUTOFS:
1046 if (!m->autofs)
1047 return -1;
1048 break;
1049 case TYPE_DEV:
1050 if (m->autofs)
1051 return -1;
1052 break;
1053 }
1054
1055 if (m->autofs) {
1056 if (asprintf(&_target, "/tmp/run/blockd/%s", device) == -1)
1057 exit(ENOMEM);
1058
1059 target = _target;
1060 } else if (m->target) {
1061 target = m->target;
1062 } else {
1063 if (asprintf(&_target, "/mnt/%s", device) == -1)
1064 exit(ENOMEM);
1065
1066 target = _target;
1067 }
1068 } else if (anon_mount) {
1069 if (asprintf(&_target, "/mnt/%s", device) == -1)
1070 exit(ENOMEM);
1071
1072 target = _target;
1073 } else {
1074 /* No reason to mount this device */
1075 return 0;
1076 }
1077
1078 /* Mount the device */
1079
1080 if (check_fs)
1081 check_filesystem(pr);
1082
1083 mkdir_p(target, 0755);
1084 if (!lstat(target, &st) && S_ISLNK(st.st_mode))
1085 unlink(target);
1086
1087 err = handle_mount(pr->dev, target, pr->type, m);
1088 if (err) {
1089 ULOG_ERR("mounting %s (%s) as %s failed (%d) - %m\n",
1090 pr->dev, pr->type, target, errno);
1091
1092 if (_target)
1093 free(_target);
1094
1095 return err;
1096 }
1097
1098 if (_target)
1099 free(_target);
1100
1101 handle_swapfiles(true);
1102
1103 if (type != TYPE_AUTOFS)
1104 blockd_notify("mount", device, NULL, NULL);
1105
1106 return 0;
1107 }
1108
1109 static int umount_device(char *path, int type, bool all)
1110 {
1111 char *mp, *devpath;
1112 int err;
1113
1114 if (strlen(path) > 5 && !strncmp("/dev/", path, 5)) {
1115 mp = find_mount_point(path);
1116 } else {
1117 devpath = malloc(strlen(path) + 6);
1118 strcpy(devpath, "/dev/");
1119 strcat(devpath, path);
1120 mp = find_mount_point(devpath);
1121 free(devpath);
1122 }
1123
1124 if (!mp)
1125 return -1;
1126 if (!strcmp(mp, "/") && !all)
1127 return 0;
1128
1129 if (type != TYPE_AUTOFS)
1130 blockd_notify("umount", basename(path), NULL, NULL);
1131
1132 err = umount2(mp, MNT_DETACH);
1133 if (err) {
1134 ULOG_ERR("unmounting %s (%s) failed (%d) - %m\n", path, mp,
1135 errno);
1136 } else {
1137 ULOG_INFO("unmounted %s (%s)\n", path, mp);
1138 rmdir(mp);
1139 }
1140
1141 free(mp);
1142 return err;
1143 }
1144
1145 static int mount_action(char *action, char *device, int type)
1146 {
1147 char *path = NULL;
1148 struct probe_info *pr;
1149
1150 if (!action || !device)
1151 return -1;
1152
1153 if (!strcmp(action, "remove")) {
1154 if (type == TYPE_HOTPLUG)
1155 blockd_notify("hotplug", device, NULL, NULL);
1156
1157 umount_device(device, type, true);
1158
1159 return 0;
1160 } else if (strcmp(action, "add")) {
1161 ULOG_ERR("Unkown action %s\n", action);
1162
1163 return -1;
1164 }
1165
1166 if (config_load(NULL))
1167 return -1;
1168
1169 cache_load(1);
1170
1171 list_for_each_entry(pr, &devices, list)
1172 if (!strcmp(basename(pr->dev), device))
1173 path = pr->dev;
1174
1175 if (!path)
1176 return -1;
1177
1178 return mount_device(find_block_info(NULL, NULL, path), type);
1179 }
1180
1181 static int main_hotplug(int argc, char **argv)
1182 {
1183 return mount_action(getenv("ACTION"), getenv("DEVNAME"), TYPE_HOTPLUG);
1184 }
1185
1186 static int main_autofs(int argc, char **argv)
1187 {
1188 int err = 0;
1189
1190 if (argc < 3)
1191 return -1;
1192
1193 if (!strcmp(argv[2], "start")) {
1194 struct probe_info *pr;
1195
1196 if (config_load(NULL))
1197 return -1;
1198
1199 cache_load(1);
1200 list_for_each_entry(pr, &devices, list) {
1201 struct mount *m;
1202 char *mp;
1203
1204 if (!strcmp(pr->type, "swap"))
1205 continue;
1206
1207 m = find_block(pr->uuid, pr->label, NULL, NULL);
1208 if (m && m->extroot)
1209 continue;
1210
1211 blockd_notify("hotplug", pr->dev, m, pr);
1212 if ((!m || !m->autofs) && (mp = find_mount_point(pr->dev))) {
1213 blockd_notify("mount", pr->dev, NULL, NULL);
1214 free(mp);
1215 }
1216 }
1217 } else {
1218 if (argc < 4)
1219 return -EINVAL;
1220
1221 err = mount_action(argv[2], argv[3], TYPE_AUTOFS);
1222 }
1223
1224 if (err) {
1225 ULOG_ERR("autofs: \"%s\" action has failed: %d\n", argv[2], err);
1226 }
1227
1228 return err;
1229 }
1230
1231 static int find_block_mtd(char *name, char *part, int plen)
1232 {
1233 FILE *fp = fopen("/proc/mtd", "r");
1234 static char line[256];
1235 char *index = NULL;
1236
1237 if(!fp)
1238 return -1;
1239
1240 while (!index && fgets(line, sizeof(line), fp)) {
1241 if (strstr(line, name)) {
1242 char *eol = strstr(line, ":");
1243
1244 if (!eol)
1245 continue;
1246
1247 *eol = '\0';
1248 index = &line[3];
1249 }
1250 }
1251
1252 fclose(fp);
1253
1254 if (!index)
1255 return -1;
1256
1257 snprintf(part, plen, "/dev/mtdblock%s", index);
1258
1259 return 0;
1260 }
1261
1262 #ifdef UBIFS_EXTROOT
1263 static int find_ubi_vol(libubi_t libubi, char *name, int *dev_num, int *vol_id)
1264 {
1265 int dev = 0;
1266
1267 while (ubi_dev_present(libubi, dev))
1268 {
1269 struct ubi_dev_info dev_info;
1270 struct ubi_vol_info vol_info;
1271
1272 if (ubi_get_dev_info1(libubi, dev++, &dev_info))
1273 continue;
1274 if (ubi_get_vol_info1_nm(libubi, dev_info.dev_num, name, &vol_info))
1275 continue;
1276
1277 *dev_num = dev_info.dev_num;
1278 *vol_id = vol_info.vol_id;
1279
1280 return 0;
1281 }
1282
1283 return -1;
1284 }
1285
1286 static int find_block_ubi(libubi_t libubi, char *name, char *part, int plen)
1287 {
1288 int dev_num;
1289 int vol_id;
1290 int err = -1;
1291
1292 err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
1293 if (!err)
1294 snprintf(part, plen, "/dev/ubi%d_%d", dev_num, vol_id);
1295
1296 return err;
1297 }
1298
1299 static int find_block_ubi_RO(libubi_t libubi, char *name, char *part, int plen)
1300 {
1301 int dev_num;
1302 int vol_id;
1303 int err = -1;
1304
1305 err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
1306 if (!err)
1307 snprintf(part, plen, "/dev/ubiblock%d_%d", dev_num, vol_id);
1308
1309 return err;
1310 }
1311 #endif
1312
1313 static int find_root_dev(char *buf, int len)
1314 {
1315 DIR *d;
1316 dev_t root;
1317 struct stat s;
1318 struct dirent *e;
1319
1320 if (stat("/", &s))
1321 return -1;
1322
1323 if (!(d = opendir("/dev")))
1324 return -1;
1325
1326 root = s.st_dev;
1327
1328 while ((e = readdir(d)) != NULL) {
1329 snprintf(buf, len, "/dev/%s", e->d_name);
1330
1331 if (stat(buf, &s) || s.st_rdev != root)
1332 continue;
1333
1334 closedir(d);
1335 return 0;
1336 }
1337
1338 closedir(d);
1339 return -1;
1340 }
1341
1342 static int test_fs_support(const char *name)
1343 {
1344 char line[128], *p;
1345 int rv = -1;
1346 FILE *f;
1347
1348 if ((f = fopen("/proc/filesystems", "r")) != NULL) {
1349 while (fgets(line, sizeof(line), f)) {
1350 p = strtok(line, "\t\n");
1351
1352 if (p && !strcmp(p, "nodev"))
1353 p = strtok(NULL, "\t\n");
1354
1355 if (p && !strcmp(p, name)) {
1356 rv = 0;
1357 break;
1358 }
1359 }
1360 fclose(f);
1361 }
1362
1363 return rv;
1364 }
1365
1366 /**
1367 * Check if mounted partition is a valid extroot
1368 *
1369 * @path target mount point
1370 *
1371 * Valid extroot partition has to contain /etc/.extroot-uuid with UUID of root
1372 * device. This function reads UUID and verifies it OR writes UUID to
1373 * .extroot-uuid if it doesn't exist yet (first extroot usage).
1374 */
1375 static int check_extroot(char *path)
1376 {
1377 struct probe_info *pr = NULL;
1378 struct probe_info *tmp;
1379 struct stat s;
1380 char uuid[64] = { 0 };
1381 char devpath[32];
1382 char tag[64];
1383 FILE *fp;
1384 int err;
1385
1386 err = find_block_mtd("\"rootfs\"", devpath, sizeof(devpath));
1387 #ifdef UBIFS_EXTROOT
1388 if (err) {
1389 libubi_t libubi;
1390
1391 libubi = libubi_open();
1392 err = find_block_ubi_RO(libubi, "rootfs", devpath, sizeof(devpath));
1393 libubi_close(libubi);
1394 }
1395 #endif
1396 if (err) {
1397 err = find_root_dev(devpath, sizeof(devpath));
1398 }
1399 if (err) {
1400 ULOG_ERR("extroot: unable to determine root device\n");
1401 return -1;
1402 }
1403
1404 /* Find root device probe_info so we know its UUID */
1405 list_for_each_entry(tmp, &devices, list) {
1406 if (!strcmp(tmp->dev, devpath)) {
1407 pr = tmp;
1408 break;
1409 }
1410 }
1411 if (!pr) {
1412 ULOG_ERR("extroot: unable to lookup root device %s\n", devpath);
1413 return -1;
1414 }
1415
1416 snprintf(tag, sizeof(tag), "%s/etc", path);
1417 if (stat(tag, &s))
1418 mkdir_p(tag, 0755);
1419
1420 snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
1421 if (stat(tag, &s)) {
1422 fp = fopen(tag, "w+");
1423 if (!fp) {
1424 ULOG_ERR("extroot: failed to write UUID to %s: %d (%m)\n",
1425 tag, errno);
1426 /* return 0 to continue boot regardless of error */
1427 return 0;
1428 }
1429 fputs(pr->uuid, fp);
1430 fclose(fp);
1431 return 0;
1432 }
1433
1434 fp = fopen(tag, "r");
1435 if (!fp) {
1436 ULOG_ERR("extroot: failed to read UUID from %s: %d (%m)\n", tag,
1437 errno);
1438 return -1;
1439 }
1440
1441 if (!fgets(uuid, sizeof(uuid), fp))
1442 ULOG_ERR("extroot: failed to read UUID from %s: %d (%m)\n", tag,
1443 errno);
1444 fclose(fp);
1445
1446 if (*uuid && !strcasecmp(uuid, pr->uuid))
1447 return 0;
1448
1449 ULOG_ERR("extroot: UUID mismatch (root: %s, %s: %s)\n", pr->uuid,
1450 basename(path), uuid);
1451 return -1;
1452 }
1453
1454 /*
1455 * Read info about extroot from UCI (using prefix) and mount it.
1456 */
1457 static int mount_extroot(char *cfg)
1458 {
1459 char overlay[] = "/tmp/extroot/overlay";
1460 char mnt[] = "/tmp/extroot/mnt";
1461 char *path = mnt;
1462 struct probe_info *pr;
1463 struct mount *m;
1464 int err = -1;
1465
1466 /* Load @cfg/etc/config/fstab */
1467 if (config_load(cfg))
1468 return -2;
1469
1470 /* See if there is extroot-specific mount config */
1471 m = find_block(NULL, NULL, NULL, "/");
1472 if (!m)
1473 m = find_block(NULL, NULL, NULL, "/overlay");
1474
1475 if (!m || !m->extroot)
1476 {
1477 ULOG_INFO("extroot: not configured\n");
1478 return -1;
1479 }
1480
1481 /* Find block device pointed by the mount config */
1482 pr = find_block_info(m->uuid, m->label, m->device);
1483
1484 if (!pr && delay_root){
1485 ULOG_INFO("extroot: device not present, retrying in %u seconds\n", delay_root);
1486 sleep(delay_root);
1487 make_devs();
1488 cache_load(1);
1489 pr = find_block_info(m->uuid, m->label, m->device);
1490 }
1491 if (pr) {
1492 if (strncmp(pr->type, "ext", 3) &&
1493 strncmp(pr->type, "f2fs", 4) &&
1494 strncmp(pr->type, "btrfs", 5) &&
1495 strncmp(pr->type, "ntfs", 4) &&
1496 strncmp(pr->type, "ubifs", 5)) {
1497 ULOG_ERR("extroot: unsupported filesystem %s, try ext4, f2fs, btrfs, ntfs or ubifs\n", pr->type);
1498 return -1;
1499 }
1500
1501 if (test_fs_support(pr->type)) {
1502 ULOG_ERR("extroot: filesystem %s not supported by kernel\n", pr->type);
1503 return -1;
1504 }
1505
1506 if (m->overlay)
1507 path = overlay;
1508 mkdir_p(path, 0755);
1509
1510 if (check_fs)
1511 check_filesystem(pr);
1512
1513 err = mount(pr->dev, path, pr->type, m->flags,
1514 (m->options) ? (m->options) : (""));
1515
1516 if (err) {
1517 ULOG_ERR("extroot: mounting %s (%s) on %s failed: %d (%m)\n",
1518 pr->dev, pr->type, path, errno);
1519 } else if (m->overlay) {
1520 err = check_extroot(path);
1521 if (err)
1522 umount(path);
1523 }
1524 } else {
1525 ULOG_ERR("extroot: cannot find device %s%s\n",
1526 (m->uuid ? "with UUID " : (m->label ? "with label " : "")),
1527 (m->uuid ? m->uuid : (m->label ? m->label : m->device)));
1528 }
1529
1530 return err;
1531 }
1532
1533 /**
1534 * Look for extroot config and mount it if present
1535 *
1536 * Look for /etc/config/fstab on all supported partitions and use it for
1537 * mounting extroot if specified.
1538 */
1539 static int main_extroot(int argc, char **argv)
1540 {
1541 struct probe_info *pr;
1542 char blkdev_path[32] = { 0 };
1543 int err = -1;
1544 #ifdef UBIFS_EXTROOT
1545 libubi_t libubi;
1546 #endif
1547
1548 if (!getenv("PREINIT"))
1549 return -1;
1550
1551 if (argc != 2) {
1552 ULOG_ERR("Usage: block extroot\n");
1553 return -1;
1554 }
1555
1556 make_devs();
1557 cache_load(1);
1558
1559 /* enable LOG_INFO messages */
1560 ulog_threshold(LOG_INFO);
1561
1562 /*
1563 * Look for "rootfs_data". We will want to mount it and check for
1564 * extroot configuration.
1565 */
1566
1567 /* Start with looking for MTD partition */
1568 find_block_mtd("\"rootfs_data\"", blkdev_path, sizeof(blkdev_path));
1569 if (blkdev_path[0]) {
1570 pr = find_block_info(NULL, NULL, blkdev_path);
1571 if (pr && !strcmp(pr->type, "jffs2")) {
1572 char cfg[] = "/tmp/jffs_cfg";
1573
1574 /*
1575 * Mount MTD part and try extroot (using
1576 * /etc/config/fstab from that partition)
1577 */
1578 mkdir_p(cfg, 0755);
1579 if (!mount(blkdev_path, cfg, "jffs2", MS_NOATIME, NULL)) {
1580 err = mount_extroot(cfg);
1581 umount2(cfg, MNT_DETACH);
1582 }
1583 if (err < 0)
1584 rmdir("/tmp/overlay");
1585 rmdir(cfg);
1586 return err;
1587 }
1588 }
1589
1590 #ifdef UBIFS_EXTROOT
1591 /* ... but it also could be an UBI volume */
1592 memset(blkdev_path, 0, sizeof(blkdev_path));
1593 libubi = libubi_open();
1594 find_block_ubi(libubi, "rootfs_data", blkdev_path, sizeof(blkdev_path));
1595 libubi_close(libubi);
1596 if (blkdev_path[0]) {
1597 char cfg[] = "/tmp/ubifs_cfg";
1598
1599 /* Mount volume and try extroot (using fstab from that vol) */
1600 mkdir_p(cfg, 0755);
1601 if (!mount(blkdev_path, cfg, "ubifs", MS_NOATIME, NULL)) {
1602 err = mount_extroot(cfg);
1603 umount2(cfg, MNT_DETACH);
1604 }
1605 if (err < 0)
1606 rmdir("/tmp/overlay");
1607 rmdir(cfg);
1608 return err;
1609 }
1610 #endif
1611
1612 /* As a last resort look for /etc/config/fstab on "rootfs" partition */
1613 return mount_extroot(NULL);
1614 }
1615
1616 static int main_mount(int argc, char **argv)
1617 {
1618 struct probe_info *pr;
1619
1620 if (config_load(NULL))
1621 return -1;
1622
1623 cache_load(1);
1624 list_for_each_entry(pr, &devices, list)
1625 mount_device(pr, TYPE_DEV);
1626
1627 handle_swapfiles(true);
1628
1629 return 0;
1630 }
1631
1632 static int main_umount(int argc, char **argv)
1633 {
1634 struct probe_info *pr;
1635 bool all = false;
1636
1637 if (config_load(NULL))
1638 return -1;
1639
1640 handle_swapfiles(false);
1641
1642 cache_load(1);
1643
1644 if (argc == 3)
1645 all = !strcmp(argv[2], "-a");
1646
1647 list_for_each_entry(pr, &devices, list) {
1648 struct mount *m;
1649
1650 if (!strcmp(pr->type, "swap"))
1651 continue;
1652
1653 m = find_block(pr->uuid, pr->label, basename(pr->dev), NULL);
1654 if (m && m->extroot)
1655 continue;
1656
1657 umount_device(pr->dev, TYPE_DEV, all);
1658 }
1659
1660 return 0;
1661 }
1662
1663 static int main_detect(int argc, char **argv)
1664 {
1665 struct probe_info *pr;
1666
1667 cache_load(0);
1668 printf("config 'global'\n");
1669 printf("\toption\tanon_swap\t'0'\n");
1670 printf("\toption\tanon_mount\t'0'\n");
1671 printf("\toption\tauto_swap\t'1'\n");
1672 printf("\toption\tauto_mount\t'1'\n");
1673 printf("\toption\tdelay_root\t'5'\n");
1674 printf("\toption\tcheck_fs\t'0'\n\n");
1675 list_for_each_entry(pr, &devices, list)
1676 print_block_uci(pr);
1677
1678 return 0;
1679 }
1680
1681 static int main_info(int argc, char **argv)
1682 {
1683 int i;
1684 struct probe_info *pr;
1685
1686 cache_load(1);
1687 if (argc == 2) {
1688 list_for_each_entry(pr, &devices, list)
1689 print_block_info(pr);
1690
1691 return 0;
1692 };
1693
1694 for (i = 2; i < argc; i++) {
1695 struct stat s;
1696
1697 if (stat(argv[i], &s)) {
1698 ULOG_ERR("failed to stat %s\n", argv[i]);
1699 continue;
1700 }
1701 if (!S_ISBLK(s.st_mode) && !(S_ISCHR(s.st_mode) && major(s.st_rdev) == 250)) {
1702 ULOG_ERR("%s is not a block device\n", argv[i]);
1703 continue;
1704 }
1705 pr = find_block_info(NULL, NULL, argv[i]);
1706 if (pr)
1707 print_block_info(pr);
1708 }
1709
1710 return 0;
1711 }
1712
1713 static int swapon_usage(void)
1714 {
1715 fprintf(stderr, "Usage: swapon [-s] [-a] [[-p pri] DEVICE]\n\n"
1716 "\tStart swapping on [DEVICE]\n"
1717 " -a\tStart swapping on all swap devices\n"
1718 " -p pri\tSet priority of swap device\n"
1719 " -s\tShow summary\n");
1720 return -1;
1721 }
1722
1723 static int main_swapon(int argc, char **argv)
1724 {
1725 int ch;
1726 FILE *fp;
1727 char *lineptr;
1728 size_t s;
1729 struct probe_info *pr;
1730 int flags = 0;
1731 int pri;
1732 struct stat st;
1733 int err;
1734
1735 while ((ch = getopt(argc, argv, "ap:s")) != -1) {
1736 switch(ch) {
1737 case 's':
1738 fp = fopen("/proc/swaps", "r");
1739 lineptr = NULL;
1740
1741 if (!fp) {
1742 ULOG_ERR("failed to open /proc/swaps\n");
1743 return -1;
1744 }
1745 while (getline(&lineptr, &s, fp) > 0)
1746 printf("%s", lineptr);
1747 if (lineptr)
1748 free(lineptr);
1749 fclose(fp);
1750 return 0;
1751 case 'a':
1752 cache_load(0);
1753 list_for_each_entry(pr, &devices, list) {
1754 if (strcmp(pr->type, "swap"))
1755 continue;
1756 if (swapon(pr->dev, 0))
1757 ULOG_ERR("failed to swapon %s\n", pr->dev);
1758 }
1759 return 0;
1760 case 'p':
1761 pri = atoi(optarg);
1762 if (pri >= 0)
1763 flags = ((pri << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
1764 break;
1765 default:
1766 return swapon_usage();
1767 }
1768 }
1769
1770 if (optind != (argc - 1))
1771 return swapon_usage();
1772
1773 if (stat(argv[optind], &st) || (!S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))) {
1774 ULOG_ERR("%s is not a block device or file\n", argv[optind]);
1775 return -1;
1776 }
1777 err = swapon(argv[optind], flags);
1778 if (err) {
1779 ULOG_ERR("failed to swapon %s (%d)\n", argv[optind], err);
1780 return err;
1781 }
1782
1783 return 0;
1784 }
1785
1786 static int main_swapoff(int argc, char **argv)
1787 {
1788 if (argc != 2) {
1789 ULOG_ERR("Usage: swapoff [-a] [DEVICE]\n\n"
1790 "\tStop swapping on DEVICE\n"
1791 " -a\tStop swapping on all swap devices\n");
1792 return -1;
1793 }
1794
1795 if (!strcmp(argv[1], "-a")) {
1796 FILE *fp = fopen("/proc/swaps", "r");
1797 char line[256];
1798
1799 if (!fp) {
1800 ULOG_ERR("failed to open /proc/swaps\n");
1801 return -1;
1802 }
1803 if (fgets(line, sizeof(line), fp))
1804 while (fgets(line, sizeof(line), fp)) {
1805 char *end = strchr(line, ' ');
1806 int err;
1807
1808 if (!end)
1809 continue;
1810 *end = '\0';
1811 err = swapoff(line);
1812 if (err)
1813 ULOG_ERR("failed to swapoff %s (%d)\n", line, err);
1814 }
1815 fclose(fp);
1816 } else {
1817 struct stat s;
1818 int err;
1819
1820 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1821 ULOG_ERR("%s is not a block device or file\n", argv[1]);
1822 return -1;
1823 }
1824 err = swapoff(argv[1]);
1825 if (err) {
1826 ULOG_ERR("failed to swapoff %s (%d)\n", argv[1], err);
1827 return err;
1828 }
1829 }
1830
1831 return 0;
1832 }
1833
1834 int main(int argc, char **argv)
1835 {
1836 char *base = basename(*argv);
1837
1838 umask(0);
1839
1840 ulog_open(-1, -1, "block");
1841 ulog_threshold(LOG_NOTICE);
1842
1843 if (!strcmp(base, "swapon"))
1844 return main_swapon(argc, argv);
1845
1846 if (!strcmp(base, "swapoff"))
1847 return main_swapoff(argc, argv);
1848
1849 if ((argc > 1) && !strcmp(base, "block")) {
1850 if (!strcmp(argv[1], "info"))
1851 return main_info(argc, argv);
1852
1853 if (!strcmp(argv[1], "detect"))
1854 return main_detect(argc, argv);
1855
1856 if (!strcmp(argv[1], "hotplug"))
1857 return main_hotplug(argc, argv);
1858
1859 if (!strcmp(argv[1], "autofs"))
1860 return main_autofs(argc, argv);
1861
1862 if (!strcmp(argv[1], "extroot"))
1863 return main_extroot(argc, argv);
1864
1865 if (!strcmp(argv[1], "mount"))
1866 return main_mount(argc, argv);
1867
1868 if (!strcmp(argv[1], "umount"))
1869 return main_umount(argc, argv);
1870
1871 if (!strcmp(argv[1], "remount")) {
1872 int ret = main_umount(argc, argv);
1873
1874 if (!ret)
1875 ret = main_mount(argc, argv);
1876 return ret;
1877 }
1878 }
1879
1880 ULOG_ERR("Usage: block <info|mount|umount|detect>\n");
1881
1882 return -1;
1883 }
OpenWrt filesystem utilities