block.c

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