block.c

   1 /*
   2  * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
   3  * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU Lesser General Public License version 2.1
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #define _GNU_SOURCE
  16 #include <getopt.h>
  17 #include <stdio.h>
  18 #include <unistd.h>
  19 #include <syslog.h>
  20 #include <libgen.h>
  21 #include <glob.h>
  22 #include <dirent.h>
  23 #include <stdarg.h>
  24 #include <string.h>
  25 #include <errno.h>
  26 #include <fcntl.h>
  27 #include <limits.h>
  28
  29 #include <sys/stat.h>
  30 #include <sys/types.h>
  31 #include <sys/swap.h>
  32 #include <sys/mount.h>
  33 #include <sys/wait.h>
  34 #include <sys/sysmacros.h>
  35
  36 #include <linux/fs.h>
  37
  38 #include <uci.h>
  39 #include <uci_blob.h>
  40
  41 #include <libubox/ulog.h>
  42 #include <libubox/list.h>
  43 #include <libubox/vlist.h>
  44 #include <libubox/blobmsg_json.h>
  45 #include <libubox/avl-cmp.h>
  46 #include <libubus.h>
  47
  48 #include "probe.h"
  49
  50 #define AUTOFS_MOUNT_PATH       "/tmp/run/blockd/"
  51
  52 #ifdef UBIFS_EXTROOT
  53 #include "libubi/libubi.h"
  54 #endif
  55
  56 enum {
  57         TYPE_MOUNT,
  58         TYPE_SWAP,
  59 };
  60
  61 enum {
  62         TYPE_DEV,
  63         TYPE_HOTPLUG,
  64         TYPE_AUTOFS,
  65 };
  66
  67 struct mount {
  68         struct vlist_node node;
  69         int type;
  70
  71         char *target;
  72         char *path;
  73         char *options;
  74         uint32_t flags;
  75         char *uuid;
  76         char *label;
  77         char *device;
  78         int extroot;
  79         int autofs;
  80         int overlay;
  81         int disabled_fsck;
  82         unsigned int prio;
  83 };
  84
  85 static struct vlist_tree mounts;
  86 static struct blob_buf b;
  87 static LIST_HEAD(devices);
  88 static int anon_mount, anon_swap, auto_mount, auto_swap, check_fs;
  89 static unsigned int delay_root;
  90
  91 enum {
  92         CFG_ANON_MOUNT,
  93         CFG_ANON_SWAP,
  94         CFG_AUTO_MOUNT,
  95         CFG_AUTO_SWAP,
  96         CFG_DELAY_ROOT,
  97         CFG_CHECK_FS,
  98         __CFG_MAX
  99 };
 100
 101 static const struct blobmsg_policy config_policy[__CFG_MAX] = {
 102         [CFG_ANON_SWAP] = { .name = "anon_swap", .type = BLOBMSG_TYPE_INT32 },
 103         [CFG_ANON_MOUNT] = { .name = "anon_mount", .type = BLOBMSG_TYPE_INT32 },
 104         [CFG_AUTO_SWAP] = { .name = "auto_swap", .type = BLOBMSG_TYPE_INT32 },
 105         [CFG_AUTO_MOUNT] = { .name = "auto_mount", .type = BLOBMSG_TYPE_INT32 },
 106         [CFG_DELAY_ROOT] = { .name = "delay_root", .type = BLOBMSG_TYPE_INT32 },
 107         [CFG_CHECK_FS] = { .name = "check_fs", .type = BLOBMSG_TYPE_INT32 },
 108 };
 109
 110 enum {
 111         MOUNT_UUID,
 112         MOUNT_LABEL,
 113         MOUNT_ENABLE,
 114         MOUNT_TARGET,
 115         MOUNT_DEVICE,
 116         MOUNT_OPTIONS,
 117         MOUNT_AUTOFS,
 118         __MOUNT_MAX
 119 };
 120
 121 static const struct uci_blob_param_list config_attr_list = {
 122         .n_params = __CFG_MAX,
 123         .params = config_policy,
 124 };
 125
 126 static const struct blobmsg_policy mount_policy[__MOUNT_MAX] = {
 127         [MOUNT_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
 128         [MOUNT_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
 129         [MOUNT_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
 130         [MOUNT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
 131         [MOUNT_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_STRING },
 132         [MOUNT_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
 133         [MOUNT_AUTOFS] = { .name = "autofs", .type = BLOBMSG_TYPE_INT32 },
 134 };
 135
 136 static const struct uci_blob_param_list mount_attr_list = {
 137         .n_params = __MOUNT_MAX,
 138         .params = mount_policy,
 139 };
 140
 141 enum {
 142         SWAP_ENABLE,
 143         SWAP_UUID,
 144         SWAP_LABEL,
 145         SWAP_DEVICE,
 146         SWAP_PRIO,
 147         __SWAP_MAX
 148 };
 149
 150 static const struct blobmsg_policy swap_policy[__SWAP_MAX] = {
 151         [SWAP_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
 152         [SWAP_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
 153         [SWAP_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
 154         [SWAP_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
 155         [SWAP_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 },
 156 };
 157
 158 static const struct uci_blob_param_list swap_attr_list = {
 159         .n_params = __SWAP_MAX,
 160         .params = swap_policy,
 161 };
 162
 163 struct mount_flag {
 164         const char *name;
 165         int32_t flag;
 166 };
 167
 168 static const struct mount_flag mount_flags[] = {
 169         { "sync",               MS_SYNCHRONOUS  },
 170         { "async",              ~MS_SYNCHRONOUS },
 171         { "dirsync",            MS_DIRSYNC      },
 172         { "mand",               MS_MANDLOCK     },
 173         { "nomand",             ~MS_MANDLOCK    },
 174         { "atime",              ~MS_NOATIME     },
 175         { "noatime",            MS_NOATIME      },
 176         { "dev",                ~MS_NODEV       },
 177         { "nodev",              MS_NODEV        },
 178         { "diratime",           ~MS_NODIRATIME  },
 179         { "nodiratime",         MS_NODIRATIME   },
 180         { "exec",               ~MS_NOEXEC      },
 181         { "noexec",             MS_NOEXEC       },
 182         { "suid",               ~MS_NOSUID      },
 183         { "nosuid",             MS_NOSUID       },
 184         { "rw",                 ~MS_RDONLY      },
 185         { "ro",                 MS_RDONLY       },
 186         { "relatime",           MS_RELATIME     },
 187         { "norelatime",         ~MS_RELATIME    },
 188         { "strictatime",        MS_STRICTATIME  },
 189         { "acl",                MS_POSIXACL     },
 190         { "noacl",              ~MS_POSIXACL    },
 191         { "nouser_xattr",       MS_NOUSER       },
 192         { "user_xattr",         ~MS_NOUSER      },
 193 };
 194
 195 static char *blobmsg_get_strdup(struct blob_attr *attr)
 196 {
 197         if (!attr)
 198                 return NULL;
 199
 200         return strdup(blobmsg_get_string(attr));
 201 }
 202
 203 static char *blobmsg_get_basename(struct blob_attr *attr)
 204 {
 205         if (!attr)
 206                 return NULL;
 207
 208         return strdup(basename(blobmsg_get_string(attr)));
 209 }
 210
 211 static void parse_mount_options(struct mount *m, char *optstr)
 212 {
 213         int i;
 214         bool is_flag;
 215         char *p, *opts, *last;
 216
 217         m->flags = 0;
 218         m->options = NULL;
 219
 220         if (!optstr || !*optstr)
 221                 return;
 222
 223         m->options = opts = calloc(1, strlen(optstr) + 1);
 224
 225         if (!m->options)
 226                 return;
 227
 228         p = last = optstr;
 229
 230         do {
 231                 p = strchr(p, ',');
 232
 233                 if (p)
 234                         *p++ = 0;
 235
 236                 for (i = 0, is_flag = false; i < ARRAY_SIZE(mount_flags); i++) {
 237                         if (!strcmp(last, mount_flags[i].name)) {
 238                                 if (mount_flags[i].flag < 0)
 239                                         m->flags &= (uint32_t)mount_flags[i].flag;
 240                                 else
 241                                         m->flags |= (uint32_t)mount_flags[i].flag;
 242                                 is_flag = true;
 243                                 break;
 244                         }
 245                 }
 246
 247                 if (!is_flag)
 248                         opts += sprintf(opts, "%s%s", (opts > m->options) ? "," : "", last);
 249
 250                 last = p;
 251
 252         } while (p);
 253
 254         free(optstr);
 255 }
 256
 257 static int mount_add(struct uci_section *s)
 258 {
 259         struct blob_attr *tb[__MOUNT_MAX] = { 0 };
 260         struct mount *m;
 261
 262         blob_buf_init(&b, 0);
 263         uci_to_blob(&b, s, &mount_attr_list);
 264         blobmsg_parse(mount_policy, __MOUNT_MAX, tb, blob_data(b.head), blob_len(b.head));
 265
 266         if (!tb[MOUNT_LABEL] && !tb[MOUNT_UUID] && !tb[MOUNT_DEVICE])
 267                 return -1;
 268
 269         if (tb[MOUNT_ENABLE] && !blobmsg_get_u32(tb[MOUNT_ENABLE]))
 270                 return -1;
 271
 272         m = malloc(sizeof(struct mount));
 273         m->type = TYPE_MOUNT;
 274         m->uuid = blobmsg_get_strdup(tb[MOUNT_UUID]);
 275         m->label = blobmsg_get_strdup(tb[MOUNT_LABEL]);
 276         m->target = blobmsg_get_strdup(tb[MOUNT_TARGET]);
 277         m->device = blobmsg_get_basename(tb[MOUNT_DEVICE]);
 278         if (tb[MOUNT_AUTOFS])
 279                 m->autofs = blobmsg_get_u32(tb[MOUNT_AUTOFS]);
 280         else
 281                 m->autofs = 0;
 282         parse_mount_options(m, blobmsg_get_strdup(tb[MOUNT_OPTIONS]));
 283
 284         m->overlay = m->extroot = 0;
 285         if (m->target && !strcmp(m->target, "/"))
 286                 m->extroot = 1;
 287         if (m->target && !strcmp(m->target, "/overlay"))
 288                 m->extroot = m->overlay = 1;
 289
 290         if (m->target && *m->target != '/') {
 291                 ULOG_WARN("ignoring mount section %s due to invalid target '%s'\n",
 292                           s->e.name, m->target);
 293                 free(m);
 294                 return -1;
 295         }
 296
 297         if (m->uuid)
 298                 vlist_add(&mounts, &m->node, m->uuid);
 299         else if (m->label)
 300                 vlist_add(&mounts, &m->node, m->label);
 301         else if (m->device)
 302                 vlist_add(&mounts, &m->node, m->device);
 303
 304         return 0;
 305 }
 306
 307 static int swap_add(struct uci_section *s)
 308 {
 309         struct blob_attr *tb[__SWAP_MAX] = { 0 };
 310         struct mount *m;
 311
 312         blob_buf_init(&b, 0);
 313         uci_to_blob(&b, s, &swap_attr_list);
 314         blobmsg_parse(swap_policy, __SWAP_MAX, tb, blob_data(b.head), blob_len(b.head));
 315
 316         if (!tb[SWAP_UUID] && !tb[SWAP_LABEL] && !tb[SWAP_DEVICE])
 317                 return -1;
 318
 319         m = malloc(sizeof(struct mount));
 320         memset(m, 0, sizeof(struct mount));
 321         m->type = TYPE_SWAP;
 322         m->uuid = blobmsg_get_strdup(tb[SWAP_UUID]);
 323         m->label = blobmsg_get_strdup(tb[SWAP_LABEL]);
 324         m->device = blobmsg_get_basename(tb[SWAP_DEVICE]);
 325         if (tb[SWAP_PRIO])
 326                 m->prio = blobmsg_get_u32(tb[SWAP_PRIO]);
 327         if (m->prio)
 328                 m->prio = ((m->prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
 329
 330         if ((!tb[SWAP_ENABLE]) || blobmsg_get_u32(tb[SWAP_ENABLE])) {
 331                 /* store complete swap path */
 332                 if (tb[SWAP_DEVICE])
 333                         m->target = blobmsg_get_strdup(tb[SWAP_DEVICE]);
 334
 335                 if (m->uuid)
 336                         vlist_add(&mounts, &m->node, m->uuid);
 337                 else if (m->label)
 338                         vlist_add(&mounts, &m->node, m->label);
 339                 else if (m->device)
 340                         vlist_add(&mounts, &m->node, m->device);
 341         }
 342
 343         return 0;
 344 }
 345
 346 static int global_add(struct uci_section *s)
 347 {
 348         struct blob_attr *tb[__CFG_MAX] = { 0 };
 349
 350         blob_buf_init(&b, 0);
 351         uci_to_blob(&b, s, &config_attr_list);
 352         blobmsg_parse(config_policy, __CFG_MAX, tb, blob_data(b.head), blob_len(b.head));
 353
 354         if ((tb[CFG_ANON_MOUNT]) && blobmsg_get_u32(tb[CFG_ANON_MOUNT]))
 355                 anon_mount = 1;
 356         if ((tb[CFG_ANON_SWAP]) && blobmsg_get_u32(tb[CFG_ANON_SWAP]))
 357                 anon_swap = 1;
 358
 359         if ((tb[CFG_AUTO_MOUNT]) && blobmsg_get_u32(tb[CFG_AUTO_MOUNT]))
 360                 auto_mount = 1;
 361         if ((tb[CFG_AUTO_SWAP]) && blobmsg_get_u32(tb[CFG_AUTO_SWAP]))
 362                 auto_swap = 1;
 363
 364         if (tb[CFG_DELAY_ROOT])
 365                 delay_root = blobmsg_get_u32(tb[CFG_DELAY_ROOT]);
 366
 367         if ((tb[CFG_CHECK_FS]) && blobmsg_get_u32(tb[CFG_CHECK_FS]))
 368                 check_fs = 1;
 369
 370         return 0;
 371 }
 372
 373 static struct mount* find_swap(const char *uuid, const char *label, const char *device)
 374 {
 375         struct mount *m;
 376
 377         vlist_for_each_element(&mounts, m, node) {
 378                 if (m->type != TYPE_SWAP)
 379                         continue;
 380                 if (uuid && m->uuid && !strcasecmp(m->uuid, uuid))
 381                         return m;
 382                 if (label && m->label && !strcmp(m->label, label))
 383                         return m;
 384                 if (device && m->device && !strcmp(m->device, device))
 385                         return m;
 386         }
 387
 388         return NULL;
 389 }
 390
 391 static struct mount* find_block(const char *uuid, const char *label, const char *device,
 392                                 const char *target)
 393 {
 394         struct mount *m;
 395
 396         vlist_for_each_element(&mounts, m, node) {
 397                 if (m->type != TYPE_MOUNT)
 398                         continue;
 399                 if (m->uuid && uuid && !strcasecmp(m->uuid, uuid))
 400                         return m;
 401                 if (m->label && label && !strcmp(m->label, label))
 402                         return m;
 403                 if (m->target && target && !strcmp(m->target, target))
 404                         return m;
 405                 if (m->device && device && !strcmp(m->device, device))
 406                         return m;
 407         }
 408
 409         return NULL;
 410 }
 411
 412 static void mounts_update(struct vlist_tree *tree, struct vlist_node *node_new,
 413                           struct vlist_node *node_old)
 414 {
 415 }
 416
 417 static struct uci_package * config_try_load(struct uci_context *ctx, char *path)
 418 {
 419         char *file = basename(path);
 420         char *dir = dirname(path);
 421         char *err;
 422         struct uci_package *pkg;
 423
 424         uci_set_confdir(ctx, dir);
 425         ULOG_INFO("attempting to load %s/%s\n", dir, file);
 426
 427         if (uci_load(ctx, file, &pkg)) {
 428                 uci_get_errorstr(ctx, &err, file);
 429                 ULOG_ERR("unable to load configuration (%s)\n", err);
 430
 431                 free(err);
 432                 return NULL;
 433         }
 434
 435         return pkg;
 436 }
 437
 438 static int config_load(char *cfg)
 439 {
 440         struct uci_context *ctx = uci_alloc_context();
 441         struct uci_package *pkg = NULL;
 442         struct uci_element *e;
 443         char path[64];
 444
 445         vlist_init(&mounts, avl_strcmp, mounts_update);
 446
 447         if (cfg) {
 448                 snprintf(path, sizeof(path), "%s/upper/etc/config/fstab", cfg);
 449                 pkg = config_try_load(ctx, path);
 450
 451                 if (!pkg) {
 452                         snprintf(path, sizeof(path), "%s/etc/config/fstab", cfg);
 453                         pkg = config_try_load(ctx, path);
 454                 }
 455         }
 456
 457         if (!pkg) {
 458                 snprintf(path, sizeof(path), "/etc/config/fstab");
 459                 pkg = config_try_load(ctx, path);
 460         }
 461
 462         if (!pkg) {
 463                 ULOG_ERR("no usable configuration\n");
 464                 return -1;
 465         }
 466
 467         vlist_update(&mounts);
 468         uci_foreach_element(&pkg->sections, e) {
 469                 struct uci_section *s = uci_to_section(e);
 470
 471                 if (!strcmp(s->type, "mount"))
 472                         mount_add(s);
 473                 if (!strcmp(s->type, "swap"))
 474                         swap_add(s);
 475                 if (!strcmp(s->type, "global"))
 476                         global_add(s);
 477         }
 478         vlist_flush(&mounts);
 479
 480         return 0;
 481 }
 482
 483 static struct probe_info* _probe_path(char *path)
 484 {
 485         struct probe_info *pr;
 486         char tmppath[64];
 487
 488         /* skip ubi device if ubiblock device is present */
 489         if (path[5] == 'u' && path[6] == 'b' && path[7] == 'i' &&
 490             path[8] >= '0' && path[8] <= '9' ) {
 491                 snprintf(tmppath, sizeof(tmppath), "/dev/ubiblock%s", path + 8);
 492                 list_for_each_entry(pr, &devices, list)
 493                         if (!strcasecmp(pr->dev, tmppath))
 494                                 return NULL;
 495         }
 496
 497         return probe_path(path);
 498 }
 499
 500 static int _cache_load(const char *path)
 501 {
 502         int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
 503         int j;
 504         glob_t gl;
 505
 506         if (glob(path, gl_flags, NULL, &gl) < 0)
 507                 return -1;
 508
 509         for (j = 0; j < gl.gl_pathc; j++) {
 510                 struct probe_info *pr = _probe_path(gl.gl_pathv[j]);
 511                 if (pr)
 512                         list_add_tail(&pr->list, &devices);
 513         }
 514
 515         globfree(&gl);
 516
 517         return 0;
 518 }
 519
 520 static void cache_load(int mtd)
 521 {
 522         if (mtd) {
 523                 _cache_load("/dev/mtdblock*");
 524                 _cache_load("/dev/ubiblock*");
 525                 _cache_load("/dev/ubi[0-9]*");
 526         }
 527         _cache_load("/dev/loop*");
 528         _cache_load("/dev/mmcblk*");
 529         _cache_load("/dev/sd*");
 530         _cache_load("/dev/hd*");
 531         _cache_load("/dev/md*");
 532         _cache_load("/dev/nvme*");
 533         _cache_load("/dev/vd*");
 534         _cache_load("/dev/xvd*");
 535         _cache_load("/dev/mapper/*");
 536 }
 537
 538
 539 static 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'0'\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 hotplug_call_mount(const char *action, const char *device)
 890 {
 891         pid_t pid;
 892         int err = 0;
 893
 894         pid = fork();
 895         if (!pid) {
 896                 char * const argv[] = { "hotplug-call", "mount", NULL };
 897
 898                 setenv("ACTION", action, 1);
 899                 setenv("DEVICE", device, 1);
 900
 901                 execv("/sbin/hotplug-call", argv);
 902                 exit(-1);
 903         } else if (pid > 0) {
 904                 int status;
 905
 906                 pid = waitpid(pid, &status, 0);
 907                 if (pid <= 0 || !WIFEXITED(status) || WEXITSTATUS(status)) {
 908                         err = -ENOEXEC;
 909                         ULOG_ERR("hotplug-call call failed\n");
 910                 }
 911         } else {
 912                 err = -errno;
 913         }
 914
 915         return err;
 916 }
 917
 918 static int handle_mount(const char *source, const char *target,
 919                         const char *fstype, struct mount *m)
 920 {
 921         int i, err;
 922         size_t mount_opts_len;
 923         char *mount_opts = NULL, *ptr;
 924
 925         err = mount(source, target, fstype, m ? m->flags : 0,
 926                     (m && m->options) ? m->options : "");
 927
 928         /* Requested file system type is not available in kernel,
 929            attempt to call mount helper. */
 930         if (err == -1 && errno == ENODEV) {
 931                 if (m) {
 932                         /* Convert mount flags back into string representation,
 933                            first calculate needed length of string buffer... */
 934                         mount_opts_len = 1 + (m->options ? strlen(m->options) : 0);
 935
 936                         for (i = 0; i < ARRAY_SIZE(mount_flags); i++)
 937                                 if ((mount_flags[i].flag > 0) &&
 938                                     (mount_flags[i].flag < INT_MAX) &&
 939                                     (m->flags & (uint32_t)mount_flags[i].flag))
 940                                         mount_opts_len += strlen(mount_flags[i].name) + 1;
 941
 942                         /* ... then now allocate and fill it ... */
 943                         ptr = mount_opts = calloc(1, mount_opts_len);
 944
 945                         if (!ptr) {
 946                                 errno = ENOMEM;
 947                                 return -1;
 948                         }
 949
 950                         if (m->options)
 951                                 ptr += sprintf(ptr, "%s,", m->options);
 952
 953                         for (i = 0; i < ARRAY_SIZE(mount_flags); i++)
 954                                 if ((mount_flags[i].flag > 0) &&
 955                                     (mount_flags[i].flag < INT_MAX) &&
 956                                     (m->flags & (uint32_t)mount_flags[i].flag))
 957                                         ptr += sprintf(ptr, "%s,", mount_flags[i].name);
 958
 959                         mount_opts[mount_opts_len - 1] = 0;
 960                 }
 961
 962                 /* ... and now finally invoke the external mount program */
 963                 err = exec_mount(source, target, fstype, mount_opts);
 964         }
 965
 966         return err;
 967 }
 968
 969 static int blockd_notify(char *device, struct mount *m, struct probe_info *pr)
 970 {
 971         struct ubus_context *ctx = ubus_connect(NULL);
 972         uint32_t id;
 973         int err;
 974
 975         if (!ctx)
 976                 return -ENXIO;
 977
 978         if (!ubus_lookup_id(ctx, "block", &id)) {
 979                 struct blob_buf buf = { 0 };
 980                 char *d = strrchr(device, '/');
 981
 982                 if (d)
 983                         d++;
 984                 else
 985                         d = device;
 986
 987                 blob_buf_init(&buf, 0);
 988
 989                 if (m) {
 990
 991                         blobmsg_add_string(&buf, "device", d);
 992                         if (m->uuid)
 993                                 blobmsg_add_string(&buf, "uuid", m->uuid);
 994                         if (m->label)
 995                                 blobmsg_add_string(&buf, "label", m->label);
 996                         if (m->target)
 997                                 blobmsg_add_string(&buf, "target", m->target);
 998                         if (m->options)
 999                                 blobmsg_add_string(&buf, "options", m->options);
1000                         if (m->autofs)
1001                                 blobmsg_add_u32(&buf, "autofs", m->autofs);
1002                         if (pr->type)
1003                                 blobmsg_add_string(&buf, "type", pr->type);
1004                         if (pr->version)
1005                                 blobmsg_add_string(&buf, "version", pr->version);
1006                 } else if (pr) {
1007                         blobmsg_add_string(&buf, "device", d);
1008                         if (pr->uuid)
1009                                 blobmsg_add_string(&buf, "uuid", pr->uuid);
1010                         if (pr->label)
1011                                 blobmsg_add_string(&buf, "label", pr->label);
1012                         if (pr->type)
1013                                 blobmsg_add_string(&buf, "type", pr->type);
1014                         if (pr->version)
1015                                 blobmsg_add_string(&buf, "version", pr->version);
1016                         blobmsg_add_u32(&buf, "anon", 1);
1017                 } else {
1018                         blobmsg_add_string(&buf, "device", d);
1019                         blobmsg_add_u32(&buf, "remove", 1);
1020                 }
1021
1022                 err = ubus_invoke(ctx, id, "hotplug", buf.head, NULL, NULL, 3000);
1023         } else {
1024                 err = -ENOENT;
1025         }
1026
1027         ubus_free(ctx);
1028
1029         return err;
1030 }
1031
1032 static int mount_device(struct probe_info *pr, int type)
1033 {
1034         struct mount *m;
1035         struct stat st;
1036         char _target[32];
1037         char *target;
1038         char *device;
1039         char *mp;
1040         int err;
1041
1042         if (!pr)
1043                 return -1;
1044
1045         device = basename(pr->dev);
1046
1047         if (!strcmp(pr->type, "swap")) {
1048                 if ((type == TYPE_HOTPLUG) && !auto_swap)
1049                         return -1;
1050                 m = find_swap(pr->uuid, pr->label, device);
1051                 if (m || anon_swap)
1052                         swapon(pr->dev, (m) ? (m->prio) : (0));
1053
1054                 return 0;
1055         }
1056
1057         m = find_block(pr->uuid, pr->label, device, NULL);
1058         if (m && m->extroot)
1059                 return -1;
1060
1061         mp = find_mount_point(pr->dev);
1062         if (mp) {
1063                 if (m && m->type == TYPE_MOUNT && strcmp(m->target, mp)) {
1064                         ULOG_ERR("%s is already mounted on %s\n", pr->dev, mp);
1065                         err = -1;
1066                 } else
1067                         err = 0;
1068                 free(mp);
1069                 return err;
1070         }
1071
1072         if (type == TYPE_HOTPLUG)
1073                 blockd_notify(device, m, pr);
1074
1075         /* Check if device should be mounted & set the target directory */
1076         if (m) {
1077                 switch (type) {
1078                 case TYPE_HOTPLUG:
1079                         if (m->autofs)
1080                                 return 0;
1081                         if (!auto_mount)
1082                                 return -1;
1083                         break;
1084                 case TYPE_AUTOFS:
1085                         if (!m->autofs)
1086                                 return -1;
1087                         break;
1088                 case TYPE_DEV:
1089                         if (m->autofs)
1090                                 return -1;
1091                         break;
1092                 }
1093
1094                 if (m->autofs) {
1095                         snprintf(_target, sizeof(_target), "/tmp/run/blockd/%s", device);
1096                         target = _target;
1097                 } else if (m->target) {
1098                         target = m->target;
1099                 } else {
1100                         snprintf(_target, sizeof(_target), "/mnt/%s", device);
1101                         target = _target;
1102                 }
1103         } else if (anon_mount) {
1104                 snprintf(_target, sizeof(_target), "/mnt/%s", device);
1105                 target = _target;
1106         } else {
1107                 /* No reason to mount this device */
1108                 return 0;
1109         }
1110
1111         /* Mount the device */
1112
1113         if (check_fs)
1114                 check_filesystem(pr);
1115
1116         mkdir_p(target);
1117         if (!lstat(target, &st) && S_ISLNK(st.st_mode))
1118                 unlink(target);
1119
1120         err = handle_mount(pr->dev, target, pr->type, m);
1121         if (err) {
1122                 ULOG_ERR("mounting %s (%s) as %s failed (%d) - %m\n",
1123                                 pr->dev, pr->type, target, errno);
1124                 return err;
1125         }
1126
1127         handle_swapfiles(true);
1128
1129         if (type != TYPE_AUTOFS)
1130                 hotplug_call_mount("add", device);
1131
1132         return 0;
1133 }
1134
1135 static int umount_device(char *path, int type, bool all)
1136 {
1137         char *mp;
1138         int err;
1139
1140         mp = find_mount_point(path);
1141         if (!mp)
1142                 return -1;
1143         if (!strcmp(mp, "/") && !all)
1144                 return 0;
1145
1146         if (type != TYPE_AUTOFS)
1147                 hotplug_call_mount("remove", basename(path));
1148
1149         err = umount2(mp, MNT_DETACH);
1150         if (err) {
1151                 ULOG_ERR("unmounting %s (%s) failed (%d) - %m\n", path, mp,
1152                          errno);
1153         } else {
1154                 ULOG_INFO("unmounted %s (%s)\n", path, mp);
1155                 rmdir(mp);
1156         }
1157
1158         free(mp);
1159         return err;
1160 }
1161
1162 static int mount_action(char *action, char *device, int type)
1163 {
1164         char path[32];
1165
1166         if (!action || !device)
1167                 return -1;
1168         snprintf(path, sizeof(path), "/dev/%s", device);
1169
1170         if (!strcmp(action, "remove")) {
1171                 if (type == TYPE_HOTPLUG)
1172                         blockd_notify(device, NULL, NULL);
1173
1174                 umount_device(path, type, true);
1175
1176                 return 0;
1177         } else if (strcmp(action, "add")) {
1178                 ULOG_ERR("Unkown action %s\n", action);
1179
1180                 return -1;
1181         }
1182
1183         if (config_load(NULL))
1184                 return -1;
1185         cache_load(0);
1186
1187         return mount_device(find_block_info(NULL, NULL, path), type);
1188 }
1189
1190 static int main_hotplug(int argc, char **argv)
1191 {
1192         return mount_action(getenv("ACTION"), getenv("DEVNAME"), TYPE_HOTPLUG);
1193 }
1194
1195 static int main_autofs(int argc, char **argv)
1196 {
1197         int err = 0;
1198
1199         if (argc < 3)
1200                 return -1;
1201
1202         if (!strcmp(argv[2], "start")) {
1203                 struct probe_info *pr;
1204
1205                 if (config_load(NULL))
1206                         return -1;
1207
1208                 cache_load(0);
1209                 list_for_each_entry(pr, &devices, list) {
1210                         struct mount *m;
1211
1212                         if (!strcmp(pr->type, "swap"))
1213                                 continue;
1214
1215                         m = find_block(pr->uuid, pr->label, NULL, NULL);
1216                         if (m && m->extroot)
1217                                 continue;
1218
1219                         blockd_notify(pr->dev, m, pr);
1220                 }
1221         } else if (!strcmp(argv[2], "available")) {
1222                 err = hotplug_call_mount("add", argv[3]);
1223         } else if (!strcmp(argv[2], "unavailable")) {
1224                 err = hotplug_call_mount("remove", argv[3]);
1225         } else {
1226                 if (argc < 4)
1227                         return -EINVAL;
1228
1229                 err = mount_action(argv[2], argv[3], TYPE_AUTOFS);
1230         }
1231
1232         if (err) {
1233                 ULOG_ERR("autofs: \"%s\" action has failed: %d\n", argv[2], err);
1234         }
1235
1236         return err;
1237 }
1238
1239 static int find_block_mtd(char *name, char *part, int plen)
1240 {
1241         FILE *fp = fopen("/proc/mtd", "r");
1242         static char line[256];
1243         char *index = NULL;
1244
1245         if(!fp)
1246                 return -1;
1247
1248         while (!index && fgets(line, sizeof(line), fp)) {
1249                 if (strstr(line, name)) {
1250                         char *eol = strstr(line, ":");
1251
1252                         if (!eol)
1253                                 continue;
1254
1255                         *eol = '\0';
1256                         index = &line[3];
1257                 }
1258         }
1259
1260         fclose(fp);
1261
1262         if (!index)
1263                 return -1;
1264
1265         snprintf(part, plen, "/dev/mtdblock%s", index);
1266
1267         return 0;
1268 }
1269
1270 #ifdef UBIFS_EXTROOT
1271 static int find_ubi_vol(libubi_t libubi, char *name, int *dev_num, int *vol_id)
1272 {
1273         int dev = 0;
1274
1275         while (ubi_dev_present(libubi, dev))
1276         {
1277                 struct ubi_dev_info dev_info;
1278                 struct ubi_vol_info vol_info;
1279
1280                 if (ubi_get_dev_info1(libubi, dev++, &dev_info))
1281                         continue;
1282                 if (ubi_get_vol_info1_nm(libubi, dev_info.dev_num, name, &vol_info))
1283                         continue;
1284
1285                 *dev_num = dev_info.dev_num;
1286                 *vol_id = vol_info.vol_id;
1287
1288                 return 0;
1289         }
1290
1291         return -1;
1292 }
1293
1294 static int find_block_ubi(libubi_t libubi, char *name, char *part, int plen)
1295 {
1296         int dev_num;
1297         int vol_id;
1298         int err = -1;
1299
1300         err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
1301         if (!err)
1302                 snprintf(part, plen, "/dev/ubi%d_%d", dev_num, vol_id);
1303
1304         return err;
1305 }
1306
1307 static int find_block_ubi_RO(libubi_t libubi, char *name, char *part, int plen)
1308 {
1309         int dev_num;
1310         int vol_id;
1311         int err = -1;
1312
1313         err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
1314         if (!err)
1315                 snprintf(part, plen, "/dev/ubiblock%d_%d", dev_num, vol_id);
1316
1317         return err;
1318 }
1319
1320 #else
1321
1322 static int find_root_dev(char *buf, int len)
1323 {
1324         DIR *d;
1325         dev_t root;
1326         struct stat s;
1327         struct dirent *e;
1328
1329         if (stat("/", &s))
1330                 return -1;
1331
1332         if (!(d = opendir("/dev")))
1333                 return -1;
1334
1335         root = s.st_dev;
1336
1337         while ((e = readdir(d)) != NULL) {
1338                 snprintf(buf, len, "/dev/%s", e->d_name);
1339
1340                 if (stat(buf, &s) || s.st_rdev != root)
1341                         continue;
1342
1343                 closedir(d);
1344                 return 0;
1345         }
1346
1347         closedir(d);
1348         return -1;
1349 }
1350
1351 #endif
1352
1353 static int test_fs_support(const char *name)
1354 {
1355         char line[128], *p;
1356         int rv = -1;
1357         FILE *f;
1358
1359         if ((f = fopen("/proc/filesystems", "r")) != NULL) {
1360                 while (fgets(line, sizeof(line), f)) {
1361                         p = strtok(line, "\t\n");
1362
1363                         if (p && !strcmp(p, "nodev"))
1364                                 p = strtok(NULL, "\t\n");
1365
1366                         if (p && !strcmp(p, name)) {
1367                                 rv = 0;
1368                                 break;
1369                         }
1370                 }
1371                 fclose(f);
1372         }
1373
1374         return rv;
1375 }
1376
1377 /**
1378  * Check if mounted partition is a valid extroot
1379  *
1380  * @path target mount point
1381  *
1382  * Valid extroot partition has to contain /etc/.extroot-uuid with UUID of root
1383  * device. This function reads UUID and verifies it OR writes UUID to
1384  * .extroot-uuid if it doesn't exist yet (first extroot usage).
1385  */
1386 static int check_extroot(char *path)
1387 {
1388         struct probe_info *pr = NULL;
1389         char devpath[32];
1390
1391 #ifdef UBIFS_EXTROOT
1392         if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) {
1393                 int err = -1;
1394                 libubi_t libubi;
1395
1396                 libubi = libubi_open();
1397                 err = find_block_ubi_RO(libubi, "rootfs", devpath, sizeof(devpath));
1398                 libubi_close(libubi);
1399                 if (err)
1400                         return -1;
1401         }
1402 #else
1403         if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) {
1404                 if (find_root_dev(devpath, sizeof(devpath))) {
1405                         ULOG_ERR("extroot: unable to determine root device\n");
1406                         return -1;
1407                 }
1408         }
1409 #endif
1410
1411         list_for_each_entry(pr, &devices, list) {
1412                 if (!strcmp(pr->dev, devpath)) {
1413                         struct stat s;
1414                         FILE *fp = NULL;
1415                         char tag[64];
1416                         char uuid[64] = { 0 };
1417
1418                         snprintf(tag, sizeof(tag), "%s/etc", path);
1419                         if (stat(tag, &s))
1420                                 mkdir_p(tag);
1421
1422                         snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
1423                         if (stat(tag, &s)) {
1424                                 fp = fopen(tag, "w+");
1425                                 if (!fp) {
1426                                         ULOG_ERR("extroot: failed to write UUID to %s: %d (%m)\n",
1427                                                  tag, errno);
1428                                         /* return 0 to continue boot regardless of error */
1429                                         return 0;
1430                                 }
1431                                 fputs(pr->uuid, fp);
1432                                 fclose(fp);
1433                                 return 0;
1434                         }
1435
1436                         fp = fopen(tag, "r");
1437                         if (!fp) {
1438                                 ULOG_ERR("extroot: failed to read UUID from %s: %d (%m)\n",
1439                                          tag, errno);
1440                                 return -1;
1441                         }
1442
1443                         if (!fgets(uuid, sizeof(uuid), fp))
1444                                 ULOG_ERR("extroot: failed to read UUID from %s: %d (%m)\n",
1445                                          tag, errno);
1446                         fclose(fp);
1447
1448                         if (*uuid && !strcasecmp(uuid, pr->uuid))
1449                                 return 0;
1450
1451                         ULOG_ERR("extroot: UUID mismatch (root: %s, %s: %s)\n",
1452                                  pr->uuid, basename(path), uuid);
1453                         return -1;
1454                 }
1455         }
1456
1457         ULOG_ERR("extroot: unable to lookup root device %s\n", devpath);
1458         return -1;
1459 }
1460
1461 /*
1462  * Read info about extroot from UCI (using prefix) and mount it.
1463  */
1464 static int mount_extroot(char *cfg)
1465 {
1466         char overlay[] = "/tmp/extroot/overlay";
1467         char mnt[] = "/tmp/extroot/mnt";
1468         char *path = mnt;
1469         struct probe_info *pr;
1470         struct mount *m;
1471         int err = -1;
1472
1473         /* Load @cfg/etc/config/fstab */
1474         if (config_load(cfg))
1475                 return -2;
1476
1477         /* See if there is extroot-specific mount config */
1478         m = find_block(NULL, NULL, NULL, "/");
1479         if (!m)
1480                 m = find_block(NULL, NULL, NULL, "/overlay");
1481
1482         if (!m || !m->extroot)
1483         {
1484                 ULOG_INFO("extroot: not configured\n");
1485                 return -1;
1486         }
1487
1488         /* Find block device pointed by the mount config */
1489         pr = find_block_info(m->uuid, m->label, m->device);
1490
1491         if (!pr && delay_root){
1492                 ULOG_INFO("extroot: device not present, retrying in %u seconds\n", delay_root);
1493                 sleep(delay_root);
1494                 make_devs();
1495                 cache_load(1);
1496                 pr = find_block_info(m->uuid, m->label, m->device);
1497         }
1498         if (pr) {
1499                 if (strncmp(pr->type, "ext", 3) &&
1500                     strncmp(pr->type, "f2fs", 4) &&
1501                     strncmp(pr->type, "btrfs", 5) &&
1502                     strncmp(pr->type, "ntfs", 4) &&
1503                     strncmp(pr->type, "ubifs", 5)) {
1504                         ULOG_ERR("extroot: unsupported filesystem %s, try ext4, f2fs, btrfs, ntfs or ubifs\n", pr->type);
1505                         return -1;
1506                 }
1507
1508                 if (test_fs_support(pr->type)) {
1509                         ULOG_ERR("extroot: filesystem %s not supported by kernel\n", pr->type);
1510                         return -1;
1511                 }
1512
1513                 if (m->overlay)
1514                         path = overlay;
1515                 mkdir_p(path);
1516
1517                 if (check_fs)
1518                         check_filesystem(pr);
1519
1520                 err = mount(pr->dev, path, pr->type, m->flags,
1521                             (m->options) ? (m->options) : (""));
1522
1523                 if (err) {
1524                         ULOG_ERR("extroot: mounting %s (%s) on %s failed: %d (%m)\n",
1525                                  pr->dev, pr->type, path, errno);
1526                 } else if (m->overlay) {
1527                         err = check_extroot(path);
1528                         if (err)
1529                                 umount(path);
1530                 }
1531         } else {
1532                 ULOG_ERR("extroot: cannot find device %s%s\n",
1533                          (m->uuid ? "with UUID " : (m->label ? "with label " : "")),
1534                          (m->uuid ? m->uuid : (m->label ? m->label : m->device)));
1535         }
1536
1537         return err;
1538 }
1539
1540 /**
1541  * Look for extroot config and mount it if present
1542  *
1543  * Look for /etc/config/fstab on all supported partitions and use it for
1544  * mounting extroot if specified.
1545  */
1546 static int main_extroot(int argc, char **argv)
1547 {
1548         struct probe_info *pr;
1549         char blkdev_path[32] = { 0 };
1550         int err = -1;
1551 #ifdef UBIFS_EXTROOT
1552         libubi_t libubi;
1553 #endif
1554
1555         if (!getenv("PREINIT"))
1556                 return -1;
1557
1558         if (argc != 2) {
1559                 ULOG_ERR("Usage: block extroot\n");
1560                 return -1;
1561         }
1562
1563         make_devs();
1564         cache_load(1);
1565
1566         /* enable LOG_INFO messages */
1567         ulog_threshold(LOG_INFO);
1568
1569         /*
1570          * Look for "rootfs_data". We will want to mount it and check for
1571          * extroot configuration.
1572          */
1573
1574         /* Start with looking for MTD partition */
1575         find_block_mtd("\"rootfs_data\"", blkdev_path, sizeof(blkdev_path));
1576         if (blkdev_path[0]) {
1577                 pr = find_block_info(NULL, NULL, blkdev_path);
1578                 if (pr && !strcmp(pr->type, "jffs2")) {
1579                         char cfg[] = "/tmp/jffs_cfg";
1580
1581                         /*
1582                          * Mount MTD part and try extroot (using
1583                          * /etc/config/fstab from that partition)
1584                          */
1585                         mkdir_p(cfg);
1586                         if (!mount(blkdev_path, cfg, "jffs2", MS_NOATIME, NULL)) {
1587                                 err = mount_extroot(cfg);
1588                                 umount2(cfg, MNT_DETACH);
1589                         }
1590                         if (err < 0)
1591                                 rmdir("/tmp/overlay");
1592                         rmdir(cfg);
1593                         return err;
1594                 }
1595         }
1596
1597 #ifdef UBIFS_EXTROOT
1598         /* ... but it also could be an UBI volume */
1599         memset(blkdev_path, 0, sizeof(blkdev_path));
1600         libubi = libubi_open();
1601         find_block_ubi(libubi, "rootfs_data", blkdev_path, sizeof(blkdev_path));
1602         libubi_close(libubi);
1603         if (blkdev_path[0]) {
1604                 char cfg[] = "/tmp/ubifs_cfg";
1605
1606                 /* Mount volume and try extroot (using fstab from that vol) */
1607                 mkdir_p(cfg);
1608                 if (!mount(blkdev_path, cfg, "ubifs", MS_NOATIME, NULL)) {
1609                         err = mount_extroot(cfg);
1610                         umount2(cfg, MNT_DETACH);
1611                 }
1612                 if (err < 0)
1613                         rmdir("/tmp/overlay");
1614                 rmdir(cfg);
1615                 return err;
1616        }
1617 #endif
1618
1619         /* As a last resort look for /etc/config/fstab on "rootfs" partition */
1620         return mount_extroot(NULL);
1621 }
1622
1623 static int main_mount(int argc, char **argv)
1624 {
1625         struct probe_info *pr;
1626
1627         if (config_load(NULL))
1628                 return -1;
1629
1630         cache_load(1);
1631         list_for_each_entry(pr, &devices, list)
1632                 mount_device(pr, TYPE_DEV);
1633
1634         handle_swapfiles(true);
1635
1636         return 0;
1637 }
1638
1639 static int main_umount(int argc, char **argv)
1640 {
1641         struct probe_info *pr;
1642         bool all = false;
1643
1644         if (config_load(NULL))
1645                 return -1;
1646
1647         handle_swapfiles(false);
1648
1649         cache_load(0);
1650
1651         if (argc == 3)
1652                 all = !strcmp(argv[2], "-a");
1653
1654         list_for_each_entry(pr, &devices, list) {
1655                 struct mount *m;
1656
1657                 if (!strcmp(pr->type, "swap"))
1658                         continue;
1659
1660                 m = find_block(pr->uuid, pr->label, basename(pr->dev), NULL);
1661                 if (m && m->extroot)
1662                         continue;
1663
1664                 umount_device(pr->dev, TYPE_DEV, all);
1665         }
1666
1667         return 0;
1668 }
1669
1670 static int main_detect(int argc, char **argv)
1671 {
1672         struct probe_info *pr;
1673
1674         cache_load(0);
1675         printf("config 'global'\n");
1676         printf("\toption\tanon_swap\t'0'\n");
1677         printf("\toption\tanon_mount\t'0'\n");
1678         printf("\toption\tauto_swap\t'1'\n");
1679         printf("\toption\tauto_mount\t'1'\n");
1680         printf("\toption\tdelay_root\t'5'\n");
1681         printf("\toption\tcheck_fs\t'0'\n\n");
1682         list_for_each_entry(pr, &devices, list)
1683                 print_block_uci(pr);
1684
1685         return 0;
1686 }
1687
1688 static int main_info(int argc, char **argv)
1689 {
1690         int i;
1691         struct probe_info *pr;
1692
1693         cache_load(1);
1694         if (argc == 2) {
1695                 list_for_each_entry(pr, &devices, list)
1696                         print_block_info(pr);
1697
1698                 return 0;
1699         };
1700
1701         for (i = 2; i < argc; i++) {
1702                 struct stat s;
1703
1704                 if (stat(argv[i], &s)) {
1705                         ULOG_ERR("failed to stat %s\n", argv[i]);
1706                         continue;
1707                 }
1708                 if (!S_ISBLK(s.st_mode) && !(S_ISCHR(s.st_mode) && major(s.st_rdev) == 250)) {
1709                         ULOG_ERR("%s is not a block device\n", argv[i]);
1710                         continue;
1711                 }
1712                 pr = find_block_info(NULL, NULL, argv[i]);
1713                 if (pr)
1714                         print_block_info(pr);
1715         }
1716
1717         return 0;
1718 }
1719
1720 static int swapon_usage(void)
1721 {
1722         fprintf(stderr, "Usage: swapon [-s] [-a] [[-p pri] DEVICE]\n\n"
1723                 "\tStart swapping on [DEVICE]\n"
1724                 " -a\tStart swapping on all swap devices\n"
1725                 " -p pri\tSet priority of swap device\n"
1726                 " -s\tShow summary\n");
1727         return -1;
1728 }
1729
1730 static int main_swapon(int argc, char **argv)
1731 {
1732         int ch;
1733         FILE *fp;
1734         char *lineptr;
1735         size_t s;
1736         struct probe_info *pr;
1737         int flags = 0;
1738         int pri;
1739         struct stat st;
1740         int err;
1741
1742         while ((ch = getopt(argc, argv, "ap:s")) != -1) {
1743                 switch(ch) {
1744                 case 's':
1745                         fp = fopen("/proc/swaps", "r");
1746                         lineptr = NULL;
1747
1748                         if (!fp) {
1749                                 ULOG_ERR("failed to open /proc/swaps\n");
1750                                 return -1;
1751                         }
1752                         while (getline(&lineptr, &s, fp) > 0)
1753                                 printf("%s", lineptr);
1754                         if (lineptr)
1755                                 free(lineptr);
1756                         fclose(fp);
1757                         return 0;
1758                 case 'a':
1759                         cache_load(0);
1760                         list_for_each_entry(pr, &devices, list) {
1761                                 if (strcmp(pr->type, "swap"))
1762                                         continue;
1763                                 if (swapon(pr->dev, 0))
1764                                         ULOG_ERR("failed to swapon %s\n", pr->dev);
1765                         }
1766                         return 0;
1767                 case 'p':
1768                         pri = atoi(optarg);
1769                         if (pri >= 0)
1770                                 flags = ((pri << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
1771                         break;
1772                 default:
1773                         return swapon_usage();
1774                 }
1775         }
1776
1777         if (optind != (argc - 1))
1778                 return swapon_usage();
1779
1780         if (stat(argv[optind], &st) || (!S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))) {
1781                 ULOG_ERR("%s is not a block device or file\n", argv[optind]);
1782                 return -1;
1783         }
1784         err = swapon(argv[optind], flags);
1785         if (err) {
1786                 ULOG_ERR("failed to swapon %s (%d)\n", argv[optind], err);
1787                 return err;
1788         }
1789
1790         return 0;
1791 }
1792
1793 static int main_swapoff(int argc, char **argv)
1794 {
1795         if (argc != 2) {
1796                 ULOG_ERR("Usage: swapoff [-a] [DEVICE]\n\n"
1797                         "\tStop swapping on DEVICE\n"
1798                         " -a\tStop swapping on all swap devices\n");
1799                 return -1;
1800         }
1801
1802         if (!strcmp(argv[1], "-a")) {
1803                 FILE *fp = fopen("/proc/swaps", "r");
1804                 char line[256];
1805
1806                 if (!fp) {
1807                         ULOG_ERR("failed to open /proc/swaps\n");
1808                         return -1;
1809                 }
1810                 if (fgets(line, sizeof(line), fp))
1811                         while (fgets(line, sizeof(line), fp)) {
1812                                 char *end = strchr(line, ' ');
1813                                 int err;
1814
1815                                 if (!end)
1816                                         continue;
1817                                 *end = '\0';
1818                                 err = swapoff(line);
1819                                 if (err)
1820                                         ULOG_ERR("failed to swapoff %s (%d)\n", line, err);
1821                         }
1822                 fclose(fp);
1823         } else {
1824                 struct stat s;
1825                 int err;
1826
1827                 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1828                         ULOG_ERR("%s is not a block device or file\n", argv[1]);
1829                         return -1;
1830                 }
1831                 err = swapoff(argv[1]);
1832                 if (err) {
1833                         ULOG_ERR("failed to swapoff %s (%d)\n", argv[1], err);
1834                         return err;
1835                 }
1836         }
1837
1838         return 0;
1839 }
1840
1841 int main(int argc, char **argv)
1842 {
1843         char *base = basename(*argv);
1844
1845         umask(0);
1846
1847         ulog_open(-1, -1, "block");
1848         ulog_threshold(LOG_NOTICE);
1849
1850         if (!strcmp(base, "swapon"))
1851                 return main_swapon(argc, argv);
1852
1853         if (!strcmp(base, "swapoff"))
1854                 return main_swapoff(argc, argv);
1855
1856         if ((argc > 1) && !strcmp(base, "block")) {
1857                 if (!strcmp(argv[1], "info"))
1858                         return main_info(argc, argv);
1859
1860                 if (!strcmp(argv[1], "detect"))
1861                         return main_detect(argc, argv);
1862
1863                 if (!strcmp(argv[1], "hotplug"))
1864                         return main_hotplug(argc, argv);
1865
1866                 if (!strcmp(argv[1], "autofs"))
1867                         return main_autofs(argc, argv);
1868
1869                 if (!strcmp(argv[1], "extroot"))
1870                         return main_extroot(argc, argv);
1871
1872                 if (!strcmp(argv[1], "mount"))
1873                         return main_mount(argc, argv);
1874
1875                 if (!strcmp(argv[1], "umount"))
1876                         return main_umount(argc, argv);
1877
1878                 if (!strcmp(argv[1], "remount")) {
1879                         int ret = main_umount(argc, argv);
1880
1881                         if (!ret)
1882                                 ret = main_mount(argc, argv);
1883                         return ret;
1884                 }
1885         }
1886
1887         ULOG_ERR("Usage: block <info|mount|umount|detect>\n");
1888
1889         return -1;
1890 }