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