• source navigation  • diff markup  • identifier search  • freetext search  • 

Sources/fstools/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] >= '' && 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 struct probe_info* find_block_info(char *uuid, char *label, char *path)
540 {
541         struct probe_info *pr = NULL;
542 
543         if (uuid)
544                 list_for_each_entry(pr, &devices, list)
545                         if (pr->uuid && !strcasecmp(pr->uuid, uuid))
546                                 return pr;
547 
548         if (label)
549                 list_for_each_entry(pr, &devices, list)
550                         if (pr->label && !strcmp(pr->label, label))
551                                 return pr;
552 
553         if (path)
554                 list_for_each_entry(pr, &devices, list)
555                         if (pr->dev && !strcmp(basename(pr->dev), basename(path)))
556                                 return pr;
557 
558         return NULL;
559 }
560 
561 static char* find_mount_point(char *block)
562 {
563         FILE *fp = fopen("/proc/self/mountinfo", "r");
564         static char line[256];
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 (!strcmp(block, devname)) {
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_uci(struct probe_info *pr)
652 {
653         if (!strcmp(pr->type, "swap")) {
654                 printf("config 'swap'\n");
655         } else {
656                 char *mp = find_mount_point(pr->dev);
657 
658                 printf("config 'mount'\n");
659                 if (mp) {
660                         printf("\toption\ttarget\t'%s'\n", mp);
661                         free(mp);
662                 } else {
663                         printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev));
664                 }
665         }
666         if (pr->uuid)
667                 printf("\toption\tuuid\t'%s'\n", pr->uuid);
668         else
669                 printf("\toption\tdevice\t'%s'\n", pr->dev);
670         printf("\toption\tenabled\t''\n\n");
671 
672         return 0;
673 }
674 
675 static int print_block_info(struct probe_info *pr)
676 {
677         static char *mp;
678 
679         mp = find_mount_point(pr->dev);
680         printf("%s:", pr->dev);
681         if (pr->uuid)
682                 printf(" UUID=\"%s\"", pr->uuid);
683 
684         if (pr->label)
685                 printf(" LABEL=\"%s\"", pr->label);
686 
687         if (pr->version)
688                 printf(" VERSION=\"%s\"", pr->version);
689 
690         if (mp) {
691                 printf(" MOUNT=\"%s\"", mp);
692                 free(mp);
693         }
694 
695         printf(" TYPE=\"%s\"\n", pr->type);
696 
697         return 0;
698 }
699 
700 static void mkdir_p(char *dir)
701 {
702         char *l = strrchr(dir, '/');
703 
704         if (l) {
705                 *l = '\0';
706                 mkdir_p(dir);
707                 *l = '/';
708                 mkdir(dir, 0755);
709         }
710 }
711 
712 static void check_filesystem(struct probe_info *pr)
713 {
714         pid_t pid;
715         struct stat statbuf;
716         const char *e2fsck = "/usr/sbin/e2fsck";
717         const char *f2fsck = "/usr/sbin/fsck.f2fs";
718         const char *fatfsck = "/usr/sbin/fsck.fat";
719         const char *btrfsck = "/usr/bin/btrfsck";
720         const char *ntfsck = "/usr/bin/ntfsfix";
721         const char *ckfs;
722 
723         /* UBIFS does not need stuff like fsck */
724         if (!strncmp(pr->type, "ubifs", 5))
725                 return;
726 
727         if (!strncmp(pr->type, "vfat", 4)) {
728                 ckfs = fatfsck;
729         } else if (!strncmp(pr->type, "f2fs", 4)) {
730                 ckfs = f2fsck;
731         } else if (!strncmp(pr->type, "ext", 3)) {
732                 ckfs = e2fsck;
733         } else if (!strncmp(pr->type, "btrfs", 5)) {
734                 ckfs = btrfsck;
735         } else if (!strncmp(pr->type, "ntfs", 4)) {
736                 ckfs = ntfsck;
737         } else {
738                 ULOG_ERR("check_filesystem: %s is not supported\n", pr->type);
739                 return;
740         }
741 
742         if (stat(ckfs, &statbuf) < 0) {
743                 ULOG_ERR("check_filesystem: %s not found\n", ckfs);
744                 return;
745         }
746 
747         pid = fork();
748         if (!pid) {
749                 if(!strncmp(pr->type, "f2fs", 4)) {
750                         execl(ckfs, ckfs, "-f", pr->dev, NULL);
751                         exit(EXIT_FAILURE);
752                 } else if(!strncmp(pr->type, "btrfs", 5)) {
753                         execl(ckfs, ckfs, "--repair", pr->dev, NULL);
754                         exit(EXIT_FAILURE);
755                 } else if(!strncmp(pr->type, "ntfs", 4)) {
756                         execl(ckfs, ckfs, "-b", pr->dev, NULL);
757                         exit(EXIT_FAILURE);
758                 } else {
759                         execl(ckfs, ckfs, "-p", pr->dev, NULL);
760                         exit(EXIT_FAILURE);
761                 }
762         } else if (pid > 0) {
763                 int status;
764 
765                 waitpid(pid, &status, 0);
766                 if (WIFEXITED(status) && WEXITSTATUS(status))
767                         ULOG_ERR("check_filesystem: %s returned %d\n", ckfs, WEXITSTATUS(status));
768                 if (WIFSIGNALED(status))
769                         ULOG_ERR("check_filesystem: %s terminated by %s\n", ckfs, strsignal(WTERMSIG(status)));
770         }
771 }
772 
773 static void handle_swapfiles(bool on)
774 {
775         struct stat s;
776         struct mount *m;
777         struct probe_info *pr;
778 
779         vlist_for_each_element(&mounts, m, node)
780         {
781                 if (m->type != TYPE_SWAP || !m->target)
782                         continue;
783 
784                 if (stat(m->target, &s) || !S_ISREG(s.st_mode))
785                         continue;
786 
787                 pr = _probe_path(m->target);
788 
789                 if (!pr)
790                         continue;
791 
792                 if (!strcmp(pr->type, "swap")) {
793                         if (on)
794                                 swapon(pr->dev, m->prio);
795                         else
796                                 swapoff(pr->dev);
797                 }
798 
799                 free(pr);
800         }
801 }
802 
803 static void to_devnull(int fd)
804 {
805         int devnull = open("/dev/null", fd ? O_WRONLY : O_RDONLY);
806 
807         if (devnull >= 0)
808                 dup2(devnull, fd);
809 
810         if (devnull > STDERR_FILENO)
811                 close(devnull);
812 }
813 
814 static int exec_mount(const char *source, const char *target,
815                       const char *fstype, const char *options)
816 {
817         pid_t pid;
818         struct stat s;
819         FILE *mount_fd;
820         int err, status, pfds[2];
821         char errmsg[128], cmd[sizeof("/sbin/mount.XXXXXXXXXXXXXXXX\0")];
822 
823         snprintf(cmd, sizeof(cmd), "/sbin/mount.%s", fstype);
824 
825         if (stat(cmd, &s) < 0 || !S_ISREG(s.st_mode) || !(s.st_mode & S_IXUSR)) {
826                 ULOG_ERR("No \"mount.%s\" utility available\n", fstype);
827                 return -1;
828         }
829 
830         if (pipe(pfds) < 0)
831                 return -1;
832 
833         fcntl(pfds[0], F_SETFD, fcntl(pfds[0], F_GETFD) | FD_CLOEXEC);
834         fcntl(pfds[1], F_SETFD, fcntl(pfds[1], F_GETFD) | FD_CLOEXEC);
835 
836         pid = vfork();
837 
838         switch (pid) {
839         case -1:
840                 close(pfds[0]);
841                 close(pfds[1]);
842 
843                 return -1;
844 
845         case 0:
846                 to_devnull(STDIN_FILENO);
847                 to_devnull(STDOUT_FILENO);
848 
849                 dup2(pfds[1], STDERR_FILENO);
850                 close(pfds[0]);
851                 close(pfds[1]);
852 
853                 if (options && *options)
854                         execl(cmd, cmd, "-o", options, source, target, NULL);
855                 else
856                         execl(cmd, cmd, source, target, NULL);
857 
858                 return -1;
859 
860         default:
861                 close(pfds[1]);
862 
863                 mount_fd = fdopen(pfds[0], "r");
864 
865                 while (fgets(errmsg, sizeof(errmsg), mount_fd))
866                         ULOG_ERR("mount.%s: %s", fstype, errmsg);
867 
868                 fclose(mount_fd);
869 
870                 err = waitpid(pid, &status, 0);
871 
872                 if (err != -1) {
873                         if (status != 0) {
874                                 ULOG_ERR("mount.%s: failed with status %d\n", fstype, status);
875                                 errno = EINVAL;
876                                 err = -1;
877                         } else {
878                                 errno = 0;
879                                 err = 0;
880                         }
881                 }
882 
883                 break;
884         }
885 
886         return err;
887 }
888 
889 static int handle_mount(const char *source, const char *target,
890                         const char *fstype, struct mount *m)
891 {
892         int i, err;
893         size_t mount_opts_len;
894         char *mount_opts = NULL, *ptr;
895 
896         err = mount(source, target, fstype, m ? m->flags : 0,
897                     (m && m->options) ? m->options : "");
898 
899         /* Requested file system type is not available in kernel,
900            attempt to call mount helper. */
901         if (err == -1 && errno == ENODEV) {
902                 if (m) {
903                         /* Convert mount flags back into string representation,
904                            first calculate needed length of string buffer... */
905                         mount_opts_len = 1 + (m->options ? strlen(m->options) : 0);
906 
907                         for (i = 0; i < ARRAY_SIZE(mount_flags); i++)
908                                 if ((mount_flags[i].flag > 0) &&
909                                     (mount_flags[i].flag < INT_MAX) &&
910                                     (m->flags & (uint32_t)mount_flags[i].flag))
911                                         mount_opts_len += strlen(mount_flags[i].name) + 1;
912 
913                         /* ... then now allocate and fill it ... */
914                         ptr = mount_opts = calloc(1, mount_opts_len);
915 
916                         if (!ptr) {
917                                 errno = ENOMEM;
918                                 return -1;
919                         }
920 
921                         if (m->options)
922                                 ptr += sprintf(ptr, "%s,", m->options);
923 
924                         for (i = 0; i < ARRAY_SIZE(mount_flags); i++)
925                                 if ((mount_flags[i].flag > 0) &&
926                                     (mount_flags[i].flag < INT_MAX) &&
927                                     (m->flags & (uint32_t)mount_flags[i].flag))
928                                         ptr += sprintf(ptr, "%s,", mount_flags[i].name);
929 
930                         mount_opts[mount_opts_len - 1] = 0;
931                 }
932 
933                 /* ... and now finally invoke the external mount program */
934                 err = exec_mount(source, target, fstype, mount_opts);
935         }
936 
937         return err;
938 }
939 
940 static int blockd_notify(const char *method, char *device, struct mount *m,
941                          struct probe_info *pr)
942 {
943         struct ubus_context *ctx = ubus_connect(NULL);
944         uint32_t id;
945         int err;
946 
947         if (!ctx)
948                 return -ENXIO;
949 
950         if (!ubus_lookup_id(ctx, "block", &id)) {
951                 struct blob_buf buf = { 0 };
952                 char *d = strrchr(device, '/');
953 
954                 if (d)
955                         d++;
956                 else
957                         d = device;
958 
959                 blob_buf_init(&buf, 0);
960 
961                 if (m) {
962 
963                         blobmsg_add_string(&buf, "device", d);
964                         if (m->uuid)
965                                 blobmsg_add_string(&buf, "uuid", m->uuid);
966                         if (m->label)
967                                 blobmsg_add_string(&buf, "label", m->label);
968                         if (m->target)
969                                 blobmsg_add_string(&buf, "target", m->target);
970                         if (m->options)
971                                 blobmsg_add_string(&buf, "options", m->options);
972                         if (m->autofs)
973                                 blobmsg_add_u32(&buf, "autofs", m->autofs);
974                         if (pr->type)
975                                 blobmsg_add_string(&buf, "type", pr->type);
976                         if (pr->version)
977                                 blobmsg_add_string(&buf, "version", pr->version);
978                 } else if (pr) {
979                         blobmsg_add_string(&buf, "device", d);
980                         if (pr->uuid)
981                                 blobmsg_add_string(&buf, "uuid", pr->uuid);
982                         if (pr->label)
983                                 blobmsg_add_string(&buf, "label", pr->label);
984                         if (pr->type)
985                                 blobmsg_add_string(&buf, "type", pr->type);
986                         if (pr->version)
987                                 blobmsg_add_string(&buf, "version", pr->version);
988                         blobmsg_add_u32(&buf, "anon", 1);
989                 } else {
990                         blobmsg_add_string(&buf, "device", d);
991                         blobmsg_add_u32(&buf, "remove", 1);
992                 }
993 
994                 err = ubus_invoke(ctx, id, method, buf.head, NULL, NULL, 3000);
995         } else {
996                 err = -ENOENT;
997         }
998 
999         ubus_free(ctx);
1000 
1001         return err;
1002 }
1003 
1004 static int mount_device(struct probe_info *pr, int type)
1005 {
1006         struct mount *m;
1007         struct stat st;
1008         char _target[32];
1009         char *target;
1010         char *device;
1011         char *mp;
1012         int err;
1013 
1014         if (!pr)
1015                 return -1;
1016 
1017         device = basename(pr->dev);
1018 
1019         if (!strcmp(pr->type, "swap")) {
1020                 if ((type == TYPE_HOTPLUG) && !auto_swap)
1021                         return -1;
1022                 m = find_swap(pr->uuid, pr->label, device);
1023                 if (m || anon_swap)
1024                         swapon(pr->dev, (m) ? (m->prio) : (0));
1025 
1026                 return 0;
1027         }
1028 
1029         m = find_block(pr->uuid, pr->label, device, NULL);
1030         if (m && m->extroot)
1031                 return -1;
1032 
1033         mp = find_mount_point(pr->dev);
1034         if (mp) {
1035                 if (m && m->type == TYPE_MOUNT && strcmp(m->target, mp)) {
1036                         ULOG_ERR("%s is already mounted on %s\n", pr->dev, mp);
1037                         err = -1;
1038                 } else
1039                         err = 0;
1040                 free(mp);
1041                 return err;
1042         }
1043 
1044         if (type == TYPE_HOTPLUG)
1045                 blockd_notify("hotplug", device, m, pr);
1046 
1047         /* Check if device should be mounted & set the target directory */
1048         if (m) {
1049                 switch (type) {
1050                 case TYPE_HOTPLUG:
1051                         if (m->autofs)
1052                                 return 0;
1053                         if (!auto_mount)
1054                                 return -1;
1055                         break;
1056                 case TYPE_AUTOFS:
1057                         if (!m->autofs)
1058                                 return -1;
1059                         break;
1060                 case TYPE_DEV:
1061                         if (m->autofs)
1062                                 return -1;
1063                         break;
1064                 }
1065 
1066                 if (m->autofs) {
1067                         snprintf(_target, sizeof(_target), "/tmp/run/blockd/%s", device);
1068                         target = _target;
1069                 } else if (m->target) {
1070                         target = m->target;
1071                 } else {
1072                         snprintf(_target, sizeof(_target), "/mnt/%s", device);
1073                         target = _target;
1074                 }
1075         } else if (anon_mount) {
1076                 snprintf(_target, sizeof(_target), "/mnt/%s", device);
1077                 target = _target;
1078         } else {
1079                 /* No reason to mount this device */
1080                 return 0;
1081         }
1082 
1083         /* Mount the device */
1084 
1085         if (check_fs)
1086                 check_filesystem(pr);
1087 
1088         mkdir_p(target);
1089         if (!lstat(target, &st) && S_ISLNK(st.st_mode))
1090                 unlink(target);
1091 
1092         err = handle_mount(pr->dev, target, pr->type, m);
1093         if (err) {
1094                 ULOG_ERR("mounting %s (%s) as %s failed (%d) - %m\n",
1095                                 pr->dev, pr->type, target, errno);
1096                 return err;
1097         }
1098 
1099         handle_swapfiles(true);
1100 
1101         if (type != TYPE_AUTOFS)
1102                 blockd_notify("mount", device, NULL, NULL);
1103 
1104         return 0;
1105 }
1106 
1107 static int umount_device(char *path, int type, bool all)
1108 {
1109         char *mp;
1110         int err;
1111 
1112         mp = find_mount_point(path);
1113         if (!mp)
1114                 return -1;
1115         if (!strcmp(mp, "/") && !all)
1116                 return 0;
1117 
1118         if (type != TYPE_AUTOFS)
1119                 blockd_notify("umount", basename(path), NULL, NULL);
1120 
1121         err = umount2(mp, MNT_DETACH);
1122         if (err) {
1123                 ULOG_ERR("unmounting %s (%s) failed (%d) - %m\n", path, mp,
1124                          errno);
1125         } else {
1126                 ULOG_INFO("unmounted %s (%s)\n", path, mp);
1127                 rmdir(mp);
1128         }
1129 
1130         free(mp);
1131         return err;
1132 }
1133 
1134 static int mount_action(char *action, char *device, int type)
1135 {
1136         char path[32];
1137 
1138         if (!action || !device)
1139                 return -1;
1140         snprintf(path, sizeof(path), "/dev/%s", device);
1141 
1142         if (!strcmp(action, "remove")) {
1143                 if (type == TYPE_HOTPLUG)
1144                         blockd_notify("hotplug", device, NULL, NULL);
1145 
1146                 umount_device(path, type, true);
1147 
1148                 return 0;
1149         } else if (strcmp(action, "add")) {
1150                 ULOG_ERR("Unkown action %s\n", action);
1151 
1152                 return -1;
1153         }
1154 
1155         if (config_load(NULL))
1156                 return -1;
1157         cache_load(0);
1158 
1159         return mount_device(find_block_info(NULL, NULL, path), type);
1160 }
1161 
1162 static int main_hotplug(int argc, char **argv)
1163 {
1164         return mount_action(getenv("ACTION"), getenv("DEVNAME"), TYPE_HOTPLUG);
1165 }
1166 
1167 static int main_autofs(int argc, char **argv)
1168 {
1169         int err = 0;
1170 
1171         if (argc < 3)
1172                 return -1;
1173 
1174         if (!strcmp(argv[2], "start")) {
1175                 struct probe_info *pr;
1176 
1177                 if (config_load(NULL))
1178                         return -1;
1179 
1180                 cache_load(0);
1181                 list_for_each_entry(pr, &devices, list) {
1182                         struct mount *m;
1183                         char *mp;
1184 
1185                         if (!strcmp(pr->type, "swap"))
1186                                 continue;
1187 
1188                         m = find_block(pr->uuid, pr->label, NULL, NULL);
1189                         if (m && m->extroot)
1190                                 continue;
1191 
1192                         blockd_notify("hotplug", pr->dev, m, pr);
1193                         if ((!m || !m->autofs) && (mp = find_mount_point(pr->dev))) {
1194                                 blockd_notify("mount", pr->dev, NULL, NULL);
1195                                 free(mp);
1196                         }
1197                 }
1198         } else {
1199                 if (argc < 4)
1200                         return -EINVAL;
1201 
1202                 err = mount_action(argv[2], argv[3], TYPE_AUTOFS);
1203         }
1204 
1205         if (err) {
1206                 ULOG_ERR("autofs: \"%s\" action has failed: %d\n", argv[2], err);
1207         }
1208 
1209         return err;
1210 }
1211 
1212 static int find_block_mtd(char *name, char *part, int plen)
1213 {
1214         FILE *fp = fopen("/proc/mtd", "r");
1215         static char line[256];
1216         char *index = NULL;
1217 
1218         if(!fp)
1219                 return -1;
1220 
1221         while (!index && fgets(line, sizeof(line), fp)) {
1222                 if (strstr(line, name)) {
1223                         char *eol = strstr(line, ":");
1224 
1225                         if (!eol)
1226                                 continue;
1227 
1228                         *eol = '\0';
1229                         index = &line[3];
1230                 }
1231         }
1232 
1233         fclose(fp);
1234 
1235         if (!index)
1236                 return -1;
1237 
1238         snprintf(part, plen, "/dev/mtdblock%s", index);
1239 
1240         return 0;
1241 }
1242 
1243 #ifdef UBIFS_EXTROOT
1244 static int find_ubi_vol(libubi_t libubi, char *name, int *dev_num, int *vol_id)
1245 {
1246         int dev = 0;
1247 
1248         while (ubi_dev_present(libubi, dev))
1249         {
1250                 struct ubi_dev_info dev_info;
1251                 struct ubi_vol_info vol_info;
1252 
1253                 if (ubi_get_dev_info1(libubi, dev++, &dev_info))
1254                         continue;
1255                 if (ubi_get_vol_info1_nm(libubi, dev_info.dev_num, name, &vol_info))
1256                         continue;
1257 
1258                 *dev_num = dev_info.dev_num;
1259                 *vol_id = vol_info.vol_id;
1260 
1261                 return 0;
1262         }
1263 
1264         return -1;
1265 }
1266 
1267 static int find_block_ubi(libubi_t libubi, char *name, char *part, int plen)
1268 {
1269         int dev_num;
1270         int vol_id;
1271         int err = -1;
1272 
1273         err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
1274         if (!err)
1275                 snprintf(part, plen, "/dev/ubi%d_%d", dev_num, vol_id);
1276 
1277         return err;
1278 }
1279 
1280 static int find_block_ubi_RO(libubi_t libubi, char *name, char *part, int plen)
1281 {
1282         int dev_num;
1283         int vol_id;
1284         int err = -1;
1285 
1286         err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
1287         if (!err)
1288                 snprintf(part, plen, "/dev/ubiblock%d_%d", dev_num, vol_id);
1289 
1290         return err;
1291 }
1292 #endif
1293 
1294 static int find_root_dev(char *buf, int len)
1295 {
1296         DIR *d;
1297         dev_t root;
1298         struct stat s;
1299         struct dirent *e;
1300 
1301         if (stat("/", &s))
1302                 return -1;
1303 
1304         if (!(d = opendir("/dev")))
1305                 return -1;
1306 
1307         root = s.st_dev;
1308 
1309         while ((e = readdir(d)) != NULL) {
1310                 snprintf(buf, len, "/dev/%s", e->d_name);
1311 
1312                 if (stat(buf, &s) || s.st_rdev != root)
1313                         continue;
1314 
1315                 closedir(d);
1316                 return 0;
1317         }
1318 
1319         closedir(d);
1320         return -1;
1321 }
1322 
1323 static int test_fs_support(const char *name)
1324 {
1325         char line[128], *p;
1326         int rv = -1;
1327         FILE *f;
1328 
1329         if ((f = fopen("/proc/filesystems", "r")) != NULL) {
1330                 while (fgets(line, sizeof(line), f)) {
1331                         p = strtok(line, "\t\n");
1332 
1333                         if (p && !strcmp(p, "nodev"))
1334                                 p = strtok(NULL, "\t\n");
1335 
1336                         if (p && !strcmp(p, name)) {
1337                                 rv = 0;
1338                                 break;
1339                         }
1340                 }
1341                 fclose(f);
1342         }
1343 
1344         return rv;
1345 }
1346 
1347 /**
1348  * Check if mounted partition is a valid extroot
1349  *
1350  * @path target mount point
1351  *
1352  * Valid extroot partition has to contain /etc/.extroot-uuid with UUID of root
1353  * device. This function reads UUID and verifies it OR writes UUID to
1354  * .extroot-uuid if it doesn't exist yet (first extroot usage).
1355  */
1356 static int check_extroot(char *path)
1357 {
1358         struct probe_info *pr = NULL;
1359         struct probe_info *tmp;
1360         struct stat s;
1361         char uuid[64] = { 0 };
1362         char devpath[32];
1363         char tag[64];
1364         FILE *fp;
1365         int err;
1366 
1367         err = find_block_mtd("\"rootfs\"", devpath, sizeof(devpath));
1368 #ifdef UBIFS_EXTROOT
1369         if (err) {
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         }
1376 #endif
1377         if (err) {
1378                 err = find_root_dev(devpath, sizeof(devpath));
1379         }
1380         if (err) {
1381                 ULOG_ERR("extroot: unable to determine root device\n");
1382                 return -1;
1383         }
1384 
1385         /* Find root device probe_info so we know its UUID */
1386         list_for_each_entry(tmp, &devices, list) {
1387                 if (!strcmp(tmp->dev, devpath)) {
1388                         pr = tmp;
1389                         break;
1390                 }
1391         }
1392         if (!pr) {
1393                 ULOG_ERR("extroot: unable to lookup root device %s\n", devpath);
1394                 return -1;
1395         }
1396 
1397         snprintf(tag, sizeof(tag), "%s/etc", path);
1398         if (stat(tag, &s))
1399                 mkdir_p(tag);
1400 
1401         snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
1402         if (stat(tag, &s)) {
1403                 fp = fopen(tag, "w+");
1404                 if (!fp) {
1405                         ULOG_ERR("extroot: failed to write UUID to %s: %d (%m)\n",
1406                                  tag, errno);
1407                         /* return 0 to continue boot regardless of error */
1408                         return 0;
1409                 }
1410                 fputs(pr->uuid, fp);
1411                 fclose(fp);
1412                 return 0;
1413         }
1414 
1415         fp = fopen(tag, "r");
1416         if (!fp) {
1417                 ULOG_ERR("extroot: failed to read UUID from %s: %d (%m)\n", tag,
1418                          errno);
1419                 return -1;
1420         }
1421 
1422         if (!fgets(uuid, sizeof(uuid), fp))
1423                 ULOG_ERR("extroot: failed to read UUID from %s: %d (%m)\n", tag,
1424                          errno);
1425         fclose(fp);
1426 
1427         if (*uuid && !strcasecmp(uuid, pr->uuid))
1428                 return 0;
1429 
1430         ULOG_ERR("extroot: UUID mismatch (root: %s, %s: %s)\n", pr->uuid,
1431                  basename(path), uuid);
1432         return -1;
1433 }
1434 
1435 /*
1436  * Read info about extroot from UCI (using prefix) and mount it.
1437  */
1438 static int mount_extroot(char *cfg)
1439 {
1440         char overlay[] = "/tmp/extroot/overlay";
1441         char mnt[] = "/tmp/extroot/mnt";
1442         char *path = mnt;
1443         struct probe_info *pr;
1444         struct mount *m;
1445         int err = -1;
1446 
1447         /* Load @cfg/etc/config/fstab */
1448         if (config_load(cfg))
1449                 return -2;
1450 
1451         /* See if there is extroot-specific mount config */
1452         m = find_block(NULL, NULL, NULL, "/");
1453         if (!m)
1454                 m = find_block(NULL, NULL, NULL, "/overlay");
1455 
1456         if (!m || !m->extroot)
1457         {
1458                 ULOG_INFO("extroot: not configured\n");
1459                 return -1;
1460         }
1461 
1462         /* Find block device pointed by the mount config */
1463         pr = find_block_info(m->uuid, m->label, m->device);
1464 
1465         if (!pr && delay_root){
1466                 ULOG_INFO("extroot: device not present, retrying in %u seconds\n", delay_root);
1467                 sleep(delay_root);
1468                 make_devs();
1469                 cache_load(1);
1470                 pr = find_block_info(m->uuid, m->label, m->device);
1471         }
1472         if (pr) {
1473                 if (strncmp(pr->type, "ext", 3) &&
1474                     strncmp(pr->type, "f2fs", 4) &&
1475                     strncmp(pr->type, "btrfs", 5) &&
1476                     strncmp(pr->type, "ntfs", 4) &&
1477                     strncmp(pr->type, "ubifs", 5)) {
1478                         ULOG_ERR("extroot: unsupported filesystem %s, try ext4, f2fs, btrfs, ntfs or ubifs\n", pr->type);
1479                         return -1;
1480                 }
1481 
1482                 if (test_fs_support(pr->type)) {
1483                         ULOG_ERR("extroot: filesystem %s not supported by kernel\n", pr->type);
1484                         return -1;
1485                 }
1486 
1487                 if (m->overlay)
1488                         path = overlay;
1489                 mkdir_p(path);
1490 
1491                 if (check_fs)
1492                         check_filesystem(pr);
1493 
1494                 err = mount(pr->dev, path, pr->type, m->flags,
1495                             (m->options) ? (m->options) : (""));
1496 
1497                 if (err) {
1498                         ULOG_ERR("extroot: mounting %s (%s) on %s failed: %d (%m)\n",
1499                                  pr->dev, pr->type, path, errno);
1500                 } else if (m->overlay) {
1501                         err = check_extroot(path);
1502                         if (err)
1503                                 umount(path);
1504                 }
1505         } else {
1506                 ULOG_ERR("extroot: cannot find device %s%s\n",
1507                          (m->uuid ? "with UUID " : (m->label ? "with label " : "")),
1508                          (m->uuid ? m->uuid : (m->label ? m->label : m->device)));
1509         }
1510 
1511         return err;
1512 }
1513 
1514 /**
1515  * Look for extroot config and mount it if present
1516  *
1517  * Look for /etc/config/fstab on all supported partitions and use it for
1518  * mounting extroot if specified.
1519  */
1520 static int main_extroot(int argc, char **argv)
1521 {
1522         struct probe_info *pr;
1523         char blkdev_path[32] = { 0 };
1524         int err = -1;
1525 #ifdef UBIFS_EXTROOT
1526         libubi_t libubi;
1527 #endif
1528 
1529         if (!getenv("PREINIT"))
1530                 return -1;
1531 
1532         if (argc != 2) {
1533                 ULOG_ERR("Usage: block extroot\n");
1534                 return -1;
1535         }
1536 
1537         make_devs();
1538         cache_load(1);
1539 
1540         /* enable LOG_INFO messages */
1541         ulog_threshold(LOG_INFO);
1542 
1543         /*
1544          * Look for "rootfs_data". We will want to mount it and check for
1545          * extroot configuration.
1546          */
1547 
1548         /* Start with looking for MTD partition */
1549         find_block_mtd("\"rootfs_data\"", blkdev_path, sizeof(blkdev_path));
1550         if (blkdev_path[0]) {
1551                 pr = find_block_info(NULL, NULL, blkdev_path);
1552                 if (pr && !strcmp(pr->type, "jffs2")) {
1553                         char cfg[] = "/tmp/jffs_cfg";
1554 
1555                         /*
1556                          * Mount MTD part and try extroot (using
1557                          * /etc/config/fstab from that partition)
1558                          */
1559                         mkdir_p(cfg);
1560                         if (!mount(blkdev_path, cfg, "jffs2", MS_NOATIME, NULL)) {
1561                                 err = mount_extroot(cfg);
1562                                 umount2(cfg, MNT_DETACH);
1563                         }
1564                         if (err < 0)
1565                                 rmdir("/tmp/overlay");
1566                         rmdir(cfg);
1567                         return err;
1568                 }
1569         }
1570 
1571 #ifdef UBIFS_EXTROOT
1572         /* ... but it also could be an UBI volume */
1573         memset(blkdev_path, 0, sizeof(blkdev_path));
1574         libubi = libubi_open();
1575         find_block_ubi(libubi, "rootfs_data", blkdev_path, sizeof(blkdev_path));
1576         libubi_close(libubi);
1577         if (blkdev_path[0]) {
1578                 char cfg[] = "/tmp/ubifs_cfg";
1579 
1580                 /* Mount volume and try extroot (using fstab from that vol) */
1581                 mkdir_p(cfg);
1582                 if (!mount(blkdev_path, cfg, "ubifs", MS_NOATIME, NULL)) {
1583                         err = mount_extroot(cfg);
1584                         umount2(cfg, MNT_DETACH);
1585                 }
1586                 if (err < 0)
1587                         rmdir("/tmp/overlay");
1588                 rmdir(cfg);
1589                 return err;
1590        }
1591 #endif
1592 
1593         /* As a last resort look for /etc/config/fstab on "rootfs" partition */
1594         return mount_extroot(NULL);
1595 }
1596 
1597 static int main_mount(int argc, char **argv)
1598 {
1599         struct probe_info *pr;
1600 
1601         if (config_load(NULL))
1602                 return -1;
1603 
1604         cache_load(1);
1605         list_for_each_entry(pr, &devices, list)
1606                 mount_device(pr, TYPE_DEV);
1607 
1608         handle_swapfiles(true);
1609 
1610         return 0;
1611 }
1612 
1613 static int main_umount(int argc, char **argv)
1614 {
1615         struct probe_info *pr;
1616         bool all = false;
1617 
1618         if (config_load(NULL))
1619                 return -1;
1620 
1621         handle_swapfiles(false);
1622 
1623         cache_load(0);
1624 
1625         if (argc == 3)
1626                 all = !strcmp(argv[2], "-a");
1627 
1628         list_for_each_entry(pr, &devices, list) {
1629                 struct mount *m;
1630 
1631                 if (!strcmp(pr->type, "swap"))
1632                         continue;
1633 
1634                 m = find_block(pr->uuid, pr->label, basename(pr->dev), NULL);
1635                 if (m && m->extroot)
1636                         continue;
1637 
1638                 umount_device(pr->dev, TYPE_DEV, all);
1639         }
1640 
1641         return 0;
1642 }
1643 
1644 static int main_detect(int argc, char **argv)
1645 {
1646         struct probe_info *pr;
1647 
1648         cache_load(0);
1649         printf("config 'global'\n");
1650         printf("\toption\tanon_swap\t''\n");
1651         printf("\toption\tanon_mount\t''\n");
1652         printf("\toption\tauto_swap\t'1'\n");
1653         printf("\toption\tauto_mount\t'1'\n");
1654         printf("\toption\tdelay_root\t'5'\n");
1655         printf("\toption\tcheck_fs\t''\n\n");
1656         list_for_each_entry(pr, &devices, list)
1657                 print_block_uci(pr);
1658 
1659         return 0;
1660 }
1661 
1662 static int main_info(int argc, char **argv)
1663 {
1664         int i;
1665         struct probe_info *pr;
1666 
1667         cache_load(1);
1668         if (argc == 2) {
1669                 list_for_each_entry(pr, &devices, list)
1670                         print_block_info(pr);
1671 
1672                 return 0;
1673         };
1674 
1675         for (i = 2; i < argc; i++) {
1676                 struct stat s;
1677 
1678                 if (stat(argv[i], &s)) {
1679                         ULOG_ERR("failed to stat %s\n", argv[i]);
1680                         continue;
1681                 }
1682                 if (!S_ISBLK(s.st_mode) && !(S_ISCHR(s.st_mode) && major(s.st_rdev) == 250)) {
1683                         ULOG_ERR("%s is not a block device\n", argv[i]);
1684                         continue;
1685                 }
1686                 pr = find_block_info(NULL, NULL, argv[i]);
1687                 if (pr)
1688                         print_block_info(pr);
1689         }
1690 
1691         return 0;
1692 }
1693 
1694 static int swapon_usage(void)
1695 {
1696         fprintf(stderr, "Usage: swapon [-s] [-a] [[-p pri] DEVICE]\n\n"
1697                 "\tStart swapping on [DEVICE]\n"
1698                 " -a\tStart swapping on all swap devices\n"
1699                 " -p pri\tSet priority of swap device\n"
1700                 " -s\tShow summary\n");
1701         return -1;
1702 }
1703 
1704 static int main_swapon(int argc, char **argv)
1705 {
1706         int ch;
1707         FILE *fp;
1708         char *lineptr;
1709         size_t s;
1710         struct probe_info *pr;
1711         int flags = 0;
1712         int pri;
1713         struct stat st;
1714         int err;
1715 
1716         while ((ch = getopt(argc, argv, "ap:s")) != -1) {
1717                 switch(ch) {
1718                 case 's':
1719                         fp = fopen("/proc/swaps", "r");
1720                         lineptr = NULL;
1721 
1722                         if (!fp) {
1723                                 ULOG_ERR("failed to open /proc/swaps\n");
1724                                 return -1;
1725                         }
1726                         while (getline(&lineptr, &s, fp) > 0)
1727                                 printf("%s", lineptr);
1728                         if (lineptr)
1729                                 free(lineptr);
1730                         fclose(fp);
1731                         return 0;
1732                 case 'a':
1733                         cache_load(0);
1734                         list_for_each_entry(pr, &devices, list) {
1735                                 if (strcmp(pr->type, "swap"))
1736                                         continue;
1737                                 if (swapon(pr->dev, 0))
1738                                         ULOG_ERR("failed to swapon %s\n", pr->dev);
1739                         }
1740                         return 0;
1741                 case 'p':
1742                         pri = atoi(optarg);
1743                         if (pri >= 0)
1744                                 flags = ((pri << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
1745                         break;
1746                 default:
1747                         return swapon_usage();
1748                 }
1749         }
1750 
1751         if (optind != (argc - 1))
1752                 return swapon_usage();
1753 
1754         if (stat(argv[optind], &st) || (!S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))) {
1755                 ULOG_ERR("%s is not a block device or file\n", argv[optind]);
1756                 return -1;
1757         }
1758         err = swapon(argv[optind], flags);
1759         if (err) {
1760                 ULOG_ERR("failed to swapon %s (%d)\n", argv[optind], err);
1761                 return err;
1762         }
1763 
1764         return 0;
1765 }
1766 
1767 static int main_swapoff(int argc, char **argv)
1768 {
1769         if (argc != 2) {
1770                 ULOG_ERR("Usage: swapoff [-a] [DEVICE]\n\n"
1771                         "\tStop swapping on DEVICE\n"
1772                         " -a\tStop swapping on all swap devices\n");
1773                 return -1;
1774         }
1775 
1776         if (!strcmp(argv[1], "-a")) {
1777                 FILE *fp = fopen("/proc/swaps", "r");
1778                 char line[256];
1779 
1780                 if (!fp) {
1781                         ULOG_ERR("failed to open /proc/swaps\n");
1782                         return -1;
1783                 }
1784                 if (fgets(line, sizeof(line), fp))
1785                         while (fgets(line, sizeof(line), fp)) {
1786                                 char *end = strchr(line, ' ');
1787                                 int err;
1788 
1789                                 if (!end)
1790                                         continue;
1791                                 *end = '\0';
1792                                 err = swapoff(line);
1793                                 if (err)
1794                                         ULOG_ERR("failed to swapoff %s (%d)\n", line, err);
1795                         }
1796                 fclose(fp);
1797         } else {
1798                 struct stat s;
1799                 int err;
1800 
1801                 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1802                         ULOG_ERR("%s is not a block device or file\n", argv[1]);
1803                         return -1;
1804                 }
1805                 err = swapoff(argv[1]);
1806                 if (err) {
1807                         ULOG_ERR("failed to swapoff %s (%d)\n", argv[1], err);
1808                         return err;
1809                 }
1810         }
1811 
1812         return 0;
1813 }
1814 
1815 int main(int argc, char **argv)
1816 {
1817         char *base = basename(*argv);
1818 
1819         umask(0);
1820 
1821         ulog_open(-1, -1, "block");
1822         ulog_threshold(LOG_NOTICE);
1823 
1824         if (!strcmp(base, "swapon"))
1825                 return main_swapon(argc, argv);
1826 
1827         if (!strcmp(base, "swapoff"))
1828                 return main_swapoff(argc, argv);
1829 
1830         if ((argc > 1) && !strcmp(base, "block")) {
1831                 if (!strcmp(argv[1], "info"))
1832                         return main_info(argc, argv);
1833 
1834                 if (!strcmp(argv[1], "detect"))
1835                         return main_detect(argc, argv);
1836 
1837                 if (!strcmp(argv[1], "hotplug"))
1838                         return main_hotplug(argc, argv);
1839 
1840                 if (!strcmp(argv[1], "autofs"))
1841                         return main_autofs(argc, argv);
1842 
1843                 if (!strcmp(argv[1], "extroot"))
1844                         return main_extroot(argc, argv);
1845 
1846                 if (!strcmp(argv[1], "mount"))
1847                         return main_mount(argc, argv);
1848 
1849                 if (!strcmp(argv[1], "umount"))
1850                         return main_umount(argc, argv);
1851 
1852                 if (!strcmp(argv[1], "remount")) {
1853                         int ret = main_umount(argc, argv);
1854 
1855                         if (!ret)
1856                                 ret = main_mount(argc, argv);
1857                         return ret;
1858                 }
1859         }
1860 
1861         ULOG_ERR("Usage: block <info|mount|umount|detect>\n");
1862 
1863         return -1;
1864 }
1865 

This page was automatically generated by LXR 0.3.1.  •  OpenWrt