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