block.c

   1 /*
   2  * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
   3  * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU Lesser General Public License version 2.1
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #define _GNU_SOURCE
  16 #include <getopt.h>
  17 #include <stdio.h>
  18 #include <unistd.h>
  19 #include <syslog.h>
  20 #include <libgen.h>
  21 #include <glob.h>
  22 #include <dirent.h>
  23 #include <stdarg.h>
  24 #include <string.h>
  25 #include <errno.h>
  26 #include <fcntl.h>
  27 #include <limits.h>
  28
  29 #include <sys/stat.h>
  30 #include <sys/types.h>
  31 #include <sys/swap.h>
  32 #include <sys/mount.h>
  33 #include <sys/wait.h>
  34 #include <sys/sysmacros.h>
  35
  36 #include <linux/fs.h>
  37
  38 #include <uci.h>
  39 #include <uci_blob.h>
  40
  41 #include <libubox/ulog.h>
  42 #include <libubox/list.h>
  43 #include <libubox/vlist.h>
  44 #include <libubox/blobmsg_json.h>
  45 #include <libubox/avl-cmp.h>
  46 #include <libubus.h>
  47
  48 #include "probe.h"
  49
  50 #define AUTOFS_MOUNT_PATH       "/tmp/run/blockd/"
  51
  52 #ifdef UBIFS_EXTROOT
  53 #include "libubi/libubi.h"
  54 #endif
  55
  56 enum {
  57         TYPE_MOUNT,
  58         TYPE_SWAP,
  59 };
  60
  61 enum {
  62         TYPE_DEV,
  63         TYPE_HOTPLUG,
  64         TYPE_AUTOFS,
  65 };
  66
  67 struct mount {
  68         struct vlist_node node;
  69         int type;
  70
  71         char *target;
  72         char *path;
  73         char *options;
  74         uint32_t flags;
  75         char *uuid;
  76         char *label;
  77         char *device;
  78         int extroot;
  79         int autofs;
  80         int overlay;
  81         int disabled_fsck;
  82         unsigned int prio;
  83 };
  84
  85 static struct vlist_tree mounts;
  86 static struct blob_buf b;
  87 static LIST_HEAD(devices);
  88 static int anon_mount, anon_swap, auto_mount, auto_swap, check_fs;
  89 static unsigned int delay_root;
  90
  91 enum {
  92         CFG_ANON_MOUNT,
  93         CFG_ANON_SWAP,
  94         CFG_AUTO_MOUNT,
  95         CFG_AUTO_SWAP,
  96         CFG_DELAY_ROOT,
  97         CFG_CHECK_FS,
  98         __CFG_MAX
  99 };
 100
 101 static const struct blobmsg_policy config_policy[__CFG_MAX] = {
 102         [CFG_ANON_SWAP] = { .name = "anon_swap", .type = BLOBMSG_TYPE_INT32 },
 103         [CFG_ANON_MOUNT] = { .name = "anon_mount", .type = BLOBMSG_TYPE_INT32 },
 104         [CFG_AUTO_SWAP] = { .name = "auto_swap", .type = BLOBMSG_TYPE_INT32 },
 105         [CFG_AUTO_MOUNT] = { .name = "auto_mount", .type = BLOBMSG_TYPE_INT32 },
 106         [CFG_DELAY_ROOT] = { .name = "delay_root", .type = BLOBMSG_TYPE_INT32 },
 107         [CFG_CHECK_FS] = { .name = "check_fs", .type = BLOBMSG_TYPE_INT32 },
 108 };
 109
 110 enum {
 111         MOUNT_UUID,
 112         MOUNT_LABEL,
 113         MOUNT_ENABLE,
 114         MOUNT_TARGET,
 115         MOUNT_DEVICE,
 116         MOUNT_OPTIONS,
 117         MOUNT_AUTOFS,
 118         __MOUNT_MAX
 119 };
 120
 121 static const struct uci_blob_param_list config_attr_list = {
 122         .n_params = __CFG_MAX,
 123         .params = config_policy,
 124 };
 125
 126 static const struct blobmsg_policy mount_policy[__MOUNT_MAX] = {
 127         [MOUNT_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
 128         [MOUNT_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
 129         [MOUNT_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
 130         [MOUNT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
 131         [MOUNT_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_STRING },
 132         [MOUNT_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
 133         [MOUNT_AUTOFS] = { .name = "autofs", .type = BLOBMSG_TYPE_INT32 },
 134 };
 135
 136 static const struct uci_blob_param_list mount_attr_list = {
 137         .n_params = __MOUNT_MAX,
 138         .params = mount_policy,
 139 };
 140
 141 enum {
 142         SWAP_ENABLE,
 143         SWAP_UUID,
 144         SWAP_LABEL,
 145         SWAP_DEVICE,
 146         SWAP_PRIO,
 147         __SWAP_MAX
 148 };
 149
 150 static const struct blobmsg_policy swap_policy[__SWAP_MAX] = {
 151         [SWAP_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
 152         [SWAP_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
 153         [SWAP_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
 154         [SWAP_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
 155         [SWAP_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 },
 156 };
 157
 158 static const struct uci_blob_param_list swap_attr_list = {
 159         .n_params = __SWAP_MAX,
 160         .params = swap_policy,
 161 };
 162
 163 struct mount_flag {
 164         const char *name;
 165         int32_t flag;
 166 };
 167
 168 static const struct mount_flag mount_flags[] = {
 169         { "sync",               MS_SYNCHRONOUS  },
 170         { "async",              ~MS_SYNCHRONOUS },
 171         { "dirsync",            MS_DIRSYNC      },
 172         { "mand",               MS_MANDLOCK     },
 173         { "nomand",             ~MS_MANDLOCK    },
 174         { "atime",              ~MS_NOATIME     },
 175         { "noatime",            MS_NOATIME      },
 176         { "dev",                ~MS_NODEV       },
 177         { "nodev",              MS_NODEV        },
 178         { "diratime",           ~MS_NODIRATIME  },
 179         { "nodiratime",         MS_NODIRATIME   },
 180         { "exec",               ~MS_NOEXEC      },
 181         { "noexec",             MS_NOEXEC       },
 182         { "suid",               ~MS_NOSUID      },
 183         { "nosuid",             MS_NOSUID       },
 184         { "rw",                 ~MS_RDONLY      },
 185         { "ro",                 MS_RDONLY       },
 186         { "relatime",           MS_RELATIME     },
 187         { "norelatime",         ~MS_RELATIME    },
 188         { "strictatime",        MS_STRICTATIME  },
 189         { "acl",                MS_POSIXACL     },
 190         { "noacl",              ~MS_POSIXACL    },
 191         { "nouser_xattr",       MS_NOUSER       },
 192         { "user_xattr",         ~MS_NOUSER      },
 193 };
 194
 195 static char *blobmsg_get_strdup(struct blob_attr *attr)
 196 {
 197         if (!attr)
 198                 return NULL;
 199
 200         return strdup(blobmsg_get_string(attr));
 201 }
 202
 203 static char *blobmsg_get_basename(struct blob_attr *attr)
 204 {
 205         if (!attr)
 206                 return NULL;
 207
 208         return strdup(basename(blobmsg_get_string(attr)));
 209 }
 210
 211 static void parse_mount_options(struct mount *m, char *optstr)
 212 {
 213         int i;
 214         bool is_flag;
 215         char *p, *opts, *last;
 216
 217         m->flags = 0;
 218         m->options = NULL;
 219
 220         if (!optstr || !*optstr)
 221                 return;
 222
 223         m->options = opts = calloc(1, strlen(optstr) + 1);
 224
 225         if (!m->options)
 226                 return;
 227
 228         p = last = optstr;
 229
 230         do {
 231                 p = strchr(p, ',');
 232
 233                 if (p)
 234                         *p++ = 0;
 235
 236                 for (i = 0, is_flag = false; i < ARRAY_SIZE(mount_flags); i++) {
 237                         if (!strcmp(last, mount_flags[i].name)) {
 238                                 if (mount_flags[i].flag < 0)
 239                                         m->flags &= (uint32_t)mount_flags[i].flag;
 240                                 else
 241                                         m->flags |= (uint32_t)mount_flags[i].flag;
 242                                 is_flag = true;
 243                                 break;
 244                         }
 245                 }
 246
 247                 if (!is_flag)
 248                         opts += sprintf(opts, "%s%s", (opts > m->options) ? "," : "", last);
 249
 250                 last = p;
 251
 252         } while (p);
 253
 254         free(optstr);
 255 }
 256
 257 static int mount_add(struct uci_section *s)
 258 {
 259         struct blob_attr *tb[__MOUNT_MAX] = { 0 };
 260         struct mount *m;
 261
 262         blob_buf_init(&b, 0);
 263         uci_to_blob(&b, s, &mount_attr_list);
 264         blobmsg_parse(mount_policy, __MOUNT_MAX, tb, blob_data(b.head), blob_len(b.head));
 265
 266         if (!tb[MOUNT_LABEL] && !tb[MOUNT_UUID] && !tb[MOUNT_DEVICE])
 267                 return -1;
 268
 269         if (tb[MOUNT_ENABLE] && !blobmsg_get_u32(tb[MOUNT_ENABLE]))
 270                 return -1;
 271
 272         m = malloc(sizeof(struct mount));
 273         m->type = TYPE_MOUNT;
 274         m->uuid = blobmsg_get_strdup(tb[MOUNT_UUID]);
 275         m->label = blobmsg_get_strdup(tb[MOUNT_LABEL]);
 276         m->target = blobmsg_get_strdup(tb[MOUNT_TARGET]);
 277         m->device = blobmsg_get_basename(tb[MOUNT_DEVICE]);
 278         if (tb[MOUNT_AUTOFS])
 279                 m->autofs = blobmsg_get_u32(tb[MOUNT_AUTOFS]);
 280         else
 281                 m->autofs = 0;
 282         parse_mount_options(m, blobmsg_get_strdup(tb[MOUNT_OPTIONS]));
 283
 284         m->overlay = m->extroot = 0;
 285         if (m->target && !strcmp(m->target, "/"))
 286                 m->extroot = 1;
 287         if (m->target && !strcmp(m->target, "/overlay"))
 288                 m->extroot = m->overlay = 1;
 289
 290         if (m->target && *m->target != '/') {
 291                 ULOG_WARN("ignoring mount section %s due to invalid target '%s'\n",
 292                           s->e.name, m->target);
 293                 free(m);
 294                 return -1;
 295         }
 296
 297         if (m->uuid)
 298                 vlist_add(&mounts, &m->node, m->uuid);
 299         else if (m->label)
 300                 vlist_add(&mounts, &m->node, m->label);
 301         else if (m->device)
 302                 vlist_add(&mounts, &m->node, m->device);
 303
 304         return 0;
 305 }
 306
 307 static int swap_add(struct uci_section *s)
 308 {
 309         struct blob_attr *tb[__SWAP_MAX] = { 0 };
 310         struct mount *m;
 311
 312         blob_buf_init(&b, 0);
 313         uci_to_blob(&b, s, &swap_attr_list);
 314         blobmsg_parse(swap_policy, __SWAP_MAX, tb, blob_data(b.head), blob_len(b.head));
 315
 316         if (!tb[SWAP_UUID] && !tb[SWAP_LABEL] && !tb[SWAP_DEVICE])
 317                 return -1;
 318
 319         m = malloc(sizeof(struct mount));
 320         memset(m, 0, sizeof(struct mount));
 321         m->type = TYPE_SWAP;
 322         m->uuid = blobmsg_get_strdup(tb[SWAP_UUID]);
 323         m->label = blobmsg_get_strdup(tb[SWAP_LABEL]);
 324         m->device = blobmsg_get_basename(tb[SWAP_DEVICE]);
 325         if (tb[SWAP_PRIO])
 326                 m->prio = blobmsg_get_u32(tb[SWAP_PRIO]);
 327         if (m->prio)
 328                 m->prio = ((m->prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
 329
 330         if ((!tb[SWAP_ENABLE]) || blobmsg_get_u32(tb[SWAP_ENABLE])) {
 331                 /* store complete swap path */
 332                 if (tb[SWAP_DEVICE])
 333                         m->target = blobmsg_get_strdup(tb[SWAP_DEVICE]);
 334
 335                 if (m->uuid)
 336                         vlist_add(&mounts, &m->node, m->uuid);
 337                 else if (m->label)
 338                         vlist_add(&mounts, &m->node, m->label);
 339                 else if (m->device)
 340                         vlist_add(&mounts, &m->node, m->device);
 341         }
 342
 343         return 0;
 344 }
 345
 346 static int global_add(struct uci_section *s)
 347 {
 348         struct blob_attr *tb[__CFG_MAX] = { 0 };
 349
 350         blob_buf_init(&b, 0);
 351         uci_to_blob(&b, s, &config_attr_list);
 352         blobmsg_parse(config_policy, __CFG_MAX, tb, blob_data(b.head), blob_len(b.head));
 353
 354         if ((tb[CFG_ANON_MOUNT]) && blobmsg_get_u32(tb[CFG_ANON_MOUNT]))
 355                 anon_mount = 1;
 356         if ((tb[CFG_ANON_SWAP]) && blobmsg_get_u32(tb[CFG_ANON_SWAP]))
 357                 anon_swap = 1;
 358
 359         if ((tb[CFG_AUTO_MOUNT]) && blobmsg_get_u32(tb[CFG_AUTO_MOUNT]))
 360                 auto_mount = 1;
 361         if ((tb[CFG_AUTO_SWAP]) && blobmsg_get_u32(tb[CFG_AUTO_SWAP]))
 362                 auto_swap = 1;
 363
 364         if (tb[CFG_DELAY_ROOT])
 365                 delay_root = blobmsg_get_u32(tb[CFG_DELAY_ROOT]);
 366
 367         if ((tb[CFG_CHECK_FS]) && blobmsg_get_u32(tb[CFG_CHECK_FS]))
 368                 check_fs = 1;
 369
 370         return 0;
 371 }
 372
 373 static struct mount* find_swap(const char *uuid, const char *label, const char *device)
 374 {
 375         struct mount *m;
 376
 377         vlist_for_each_element(&mounts, m, node) {
 378                 if (m->type != TYPE_SWAP)
 379                         continue;
 380                 if (uuid && m->uuid && !strcasecmp(m->uuid, uuid))
 381                         return m;
 382                 if (label && m->label && !strcmp(m->label, label))
 383                         return m;
 384                 if (device && m->device && !strcmp(m->device, device))
 385                         return m;
 386         }
 387
 388         return NULL;
 389 }
 390
 391 static struct mount* find_block(const char *uuid, const char *label, const char *device,
 392                                 const char *target)
 393 {
 394         struct mount *m;
 395
 396         vlist_for_each_element(&mounts, m, node) {
 397                 if (m->type != TYPE_MOUNT)
 398                         continue;
 399                 if (m->uuid && uuid && !strcasecmp(m->uuid, uuid))
 400                         return m;
 401                 if (m->label && label && !strcmp(m->label, label))
 402                         return m;
 403                 if (m->target && target && !strcmp(m->target, target))
 404                         return m;
 405                 if (m->device && device && !strcmp(m->device, device))
 406                         return m;
 407         }
 408
 409         return NULL;
 410 }
 411
 412 static void mounts_update(struct vlist_tree *tree, struct vlist_node *node_new,
 413                           struct vlist_node *node_old)
 414 {
 415 }
 416
 417 static struct uci_package * config_try_load(struct uci_context *ctx, char *path)
 418 {
 419         char *file = basename(path);
 420         char *dir = dirname(path);
 421         char *err;
 422         struct uci_package *pkg;
 423
 424         uci_set_confdir(ctx, dir);
 425         ULOG_INFO("attempting to load %s/%s\n", dir, file);
 426
 427         if (uci_load(ctx, file, &pkg)) {
 428                 uci_get_errorstr(ctx, &err, file);
 429                 ULOG_ERR("unable to load configuration (%s)\n", err);
 430
 431                 free(err);
 432                 return NULL;
 433         }
 434
 435         return pkg;
 436 }
 437
 438 static int config_load(char *cfg)
 439 {
 440         struct uci_context *ctx = uci_alloc_context();
 441         struct uci_package *pkg = NULL;
 442         struct uci_element *e;
 443         char path[64];
 444
 445         vlist_init(&mounts, avl_strcmp, mounts_update);
 446
 447         if (cfg) {
 448                 snprintf(path, sizeof(path), "%s/upper/etc/config/fstab", cfg);
 449                 pkg = config_try_load(ctx, path);
 450
 451                 if (!pkg) {
 452                         snprintf(path, sizeof(path), "%s/etc/config/fstab", cfg);
 453                         pkg = config_try_load(ctx, path);
 454                 }
 455         }
 456
 457         if (!pkg) {
 458                 snprintf(path, sizeof(path), "/etc/config/fstab");
 459                 pkg = config_try_load(ctx, path);
 460         }
 461
 462         if (!pkg) {
 463                 ULOG_ERR("no usable configuration\n");
 464                 return -1;
 465         }
 466
 467         vlist_update(&mounts);
 468         uci_foreach_element(&pkg->sections, e) {
 469                 struct uci_section *s = uci_to_section(e);
 470
 471                 if (!strcmp(s->type, "mount"))
 472                         mount_add(s);
 473                 if (!strcmp(s->type, "swap"))
 474                         swap_add(s);
 475                 if (!strcmp(s->type, "global"))
 476                         global_add(s);
 477         }
 478         vlist_flush(&mounts);
 479
 480         return 0;
 481 }
 482
 483 static struct probe_info* _probe_path(char *path)
 484 {
 485         struct probe_info *pr;
 486         char tmppath[64];
 487
 488         /* skip ubi device if ubiblock device is present */
 489         if (path[5] == 'u' && path[6] == 'b' && path[7] == 'i' &&
 490             path[8] >= '0' && path[8] <= '9' ) {
 491                 snprintf(tmppath, sizeof(tmppath), "/dev/ubiblock%s", path + 8);
 492                 list_for_each_entry(pr, &devices, list)
 493                         if (!strcasecmp(pr->dev, tmppath))
 494                                 return NULL;
 495         }
 496
 497         return probe_path(path);
 498 }
 499
 500 static int _cache_load(const char *path)
 501 {
 502         int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
 503         int j;
 504         glob_t gl;
 505
 506         if (glob(path, gl_flags, NULL, &gl) < 0)
 507                 return -1;
 508
 509         for (j = 0; j < gl.gl_pathc; j++) {
 510                 struct probe_info *pr = _probe_path(gl.gl_pathv[j]);
 511                 if (pr)
 512                         list_add_tail(&pr->list, &devices);
 513         }
 514
 515         globfree(&gl);
 516
 517         return 0;
 518 }
 519
 520 static void cache_load(int mtd)
 521 {
 522         if (mtd) {
 523                 _cache_load("/dev/mtdblock*");
 524                 _cache_load("/dev/ubiblock*");
 525                 _cache_load("/dev/ubi[0-9]*");
 526         }
 527         _cache_load("/dev/loop*");
 528         _cache_load("/dev/mmcblk*");
 529         _cache_load("/dev/sd*");
 530         _cache_load("/dev/hd*");
 531         _cache_load("/dev/md*");
 532         _cache_load("/dev/nvme*");
 533         _cache_load("/dev/vd*");
 534         _cache_load("/dev/xvd*");
 535         _cache_load("/dev/mapper/*");
 536 }
 537
 538
 539 static int print_block_uci(struct probe_info *pr)
 540 {
 541         if (!strcmp(pr->type, "swap")) {
 542                 printf("config 'swap'\n");
 543         } else {
 544                 printf("config 'mount'\n");
 545                 printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev));
 546         }
 547         if (pr->uuid)
 548                 printf("\toption\tuuid\t'%s'\n", pr->uuid);
 549         else
 550                 printf("\toption\tdevice\t'%s'\n", pr->dev);
 551         printf("\toption\tenabled\t'0'\n\n");
 552
 553         return 0;
 554 }
 555
 556 static struct probe_info* find_block_info(char *uuid, char *label, char *path)
 557 {
 558         struct probe_info *pr = NULL;
 559
 560         if (uuid)
 561                 list_for_each_entry(pr, &devices, list)
 562                         if (pr->uuid && !strcasecmp(pr->uuid, uuid))
 563                                 return pr;
 564
 565         if (label)
 566                 list_for_each_entry(pr, &devices, list)
 567                         if (pr->label && !strcmp(pr->label, label))
 568                                 return pr;
 569
 570         if (path)
 571                 list_for_each_entry(pr, &devices, list)
 572                         if (pr->dev && !strcmp(basename(pr->dev), basename(path)))
 573                                 return pr;
 574
 575         return NULL;
 576 }
 577
 578 static char* find_mount_point(char *block)
 579 {
 580         FILE *fp = fopen("/proc/self/mountinfo", "r");
 581         static char line[256];
 582         int len = strlen(block);
 583         char *point = NULL, *pos, *tmp, *cpoint, *devname;
 584         struct stat s;
 585         int rstat;
 586         unsigned int minor, major;
 587
 588         if (!fp)
 589                 return NULL;
 590
 591         rstat = stat(block, &s);
 592
 593         while (fgets(line, sizeof(line), fp)) {
 594                 pos = strchr(line, ' ');
 595                 if (!pos)
 596                         continue;
 597
 598                 pos = strchr(pos + 1, ' ');
 599                 if (!pos)
 600                         continue;
 601
 602                 tmp = ++pos;
 603                 pos = strchr(pos, ':');
 604                 if (!pos)
 605                         continue;
 606
 607                 *pos = '\0';
 608                 major = atoi(tmp);
 609                 tmp = ++pos;
 610                 pos = strchr(pos, ' ');
 611                 if (!pos)
 612                         continue;
 613
 614                 *pos = '\0';
 615                 minor = atoi(tmp);
 616                 pos = strchr(pos + 1, ' ');
 617                 if (!pos)
 618                         continue;
 619                 tmp = ++pos;
 620
 621                 pos = strchr(pos, ' ');
 622                 if (!pos)
 623                         continue;
 624                 *pos = '\0';
 625                 cpoint = tmp;
 626
 627                 pos = strchr(pos + 1, ' ');
 628                 if (!pos)
 629                         continue;
 630
 631                 pos = strchr(pos + 1, ' ');
 632                 if (!pos)
 633                         continue;
 634
 635                 pos = strchr(pos + 1, ' ');
 636                 if (!pos)
 637                         continue;
 638
 639                 tmp = ++pos;
 640                 pos = strchr(pos, ' ');
 641                 if (!pos)
 642                         continue;
 643
 644                 *pos = '\0';
 645                 devname = tmp;
 646                 if (!strncmp(block, devname, len)) {
 647                         point = strdup(cpoint);
 648                         break;
 649                 }
 650
 651                 if (rstat)
 652                         continue;
 653
 654                 if (!S_ISBLK(s.st_mode))
 655                         continue;
 656
 657                 if (major == major(s.st_rdev) &&
 658                     minor == minor(s.st_rdev)) {
 659                         point = strdup(cpoint);
 660                         break;
 661                 }
 662         }
 663
 664         fclose(fp);
 665
 666         return point;
 667 }
 668
 669 static int print_block_info(struct probe_info *pr)
 670 {
 671         static char *mp;
 672
 673         mp = find_mount_point(pr->dev);
 674         printf("%s:", pr->dev);
 675         if (pr->uuid)
 676                 printf(" UUID=\"%s\"", pr->uuid);
 677
 678         if (pr->label)
 679                 printf(" LABEL=\"%s\"", pr->label);
 680
 681         if (pr->version)
 682                 printf(" VERSION=\"%s\"", pr->version);
 683
 684         if (mp) {
 685                 printf(" MOUNT=\"%s\"", mp);
 686                 free(mp);
 687         }
 688
 689         printf(" TYPE=\"%s\"\n", pr->type);
 690
 691         return 0;
 692 }
 693
 694 static void mkdir_p(char *dir)
 695 {
 696         char *l = strrchr(dir, '/');
 697
 698         if (l) {
 699                 *l = '\0';
 700                 mkdir_p(dir);
 701                 *l = '/';
 702                 mkdir(dir, 0755);
 703         }
 704 }
 705
 706 static void check_filesystem(struct probe_info *pr)
 707 {
 708         pid_t pid;
 709         struct stat statbuf;
 710         const char *e2fsck = "/usr/sbin/e2fsck";
 711         const char *f2fsck = "/usr/sbin/fsck.f2fs";
 712         const char *dosfsck = "/usr/sbin/dosfsck";
 713         const char *btrfsck = "/usr/bin/btrfsck";
 714         const char *ntfsck = "/usr/bin/ntfsfix";
 715         const char *ckfs;
 716
 717         /* UBIFS does not need stuff like fsck */
 718         if (!strncmp(pr->type, "ubifs", 5))
 719                 return;
 720
 721         if (!strncmp(pr->type, "vfat", 4)) {
 722                 ckfs = dosfsck;
 723         } else if (!strncmp(pr->type, "f2fs", 4)) {
 724                 ckfs = f2fsck;
 725         } else if (!strncmp(pr->type, "ext", 3)) {
 726                 ckfs = e2fsck;
 727         } else if (!strncmp(pr->type, "btrfs", 5)) {
 728                 ckfs = btrfsck;
 729         } else if (!strncmp(pr->type, "ntfs", 4)) {
 730                 ckfs = ntfsck;
 731         } else {
 732                 ULOG_ERR("check_filesystem: %s is not supported\n", pr->type);
 733                 return;
 734         }
 735
 736         if (stat(ckfs, &statbuf) < 0) {
 737                 ULOG_ERR("check_filesystem: %s not found\n", ckfs);
 738                 return;
 739         }
 740
 741         pid = fork();
 742         if (!pid) {
 743                 if(!strncmp(pr->type, "f2fs", 4)) {
 744                         execl(ckfs, ckfs, "-f", pr->dev, NULL);
 745                         exit(EXIT_FAILURE);
 746                 } else if(!strncmp(pr->type, "btrfs", 5)) {
 747                         execl(ckfs, ckfs, "--repair", pr->dev, NULL);
 748                         exit(EXIT_FAILURE);
 749                 } else if(!strncmp(pr->type, "ntfs", 4)) {
 750                         execl(ckfs, ckfs, "-b", pr->dev, NULL);
 751                         exit(EXIT_FAILURE);
 752                 } else {
 753                         execl(ckfs, ckfs, "-p", pr->dev, NULL);
 754                         exit(EXIT_FAILURE);
 755                 }
 756         } else if (pid > 0) {
 757                 int status;
 758
 759                 waitpid(pid, &status, 0);
 760                 if (WIFEXITED(status) && WEXITSTATUS(status))
 761                         ULOG_ERR("check_filesystem: %s returned %d\n", ckfs, WEXITSTATUS(status));
 762                 if (WIFSIGNALED(status))
 763                         ULOG_ERR("check_filesystem: %s terminated by %s\n", ckfs, strsignal(WTERMSIG(status)));
 764         }
 765 }
 766
 767 static void handle_swapfiles(bool on)
 768 {
 769         struct stat s;
 770         struct mount *m;
 771         struct probe_info *pr;
 772
 773         vlist_for_each_element(&mounts, m, node)
 774         {
 775                 if (m->type != TYPE_SWAP || !m->target)
 776                         continue;
 777
 778                 if (stat(m->target, &s) || !S_ISREG(s.st_mode))
 779                         continue;
 780
 781                 pr = _probe_path(m->target);
 782
 783                 if (!pr)
 784                         continue;
 785
 786                 if (!strcmp(pr->type, "swap")) {
 787                         if (on)
 788                                 swapon(pr->dev, m->prio);
 789                         else
 790                                 swapoff(pr->dev);
 791                 }
 792
 793                 free(pr);
 794         }
 795 }
 796
 797 static void to_devnull(int fd)
 798 {
 799         int devnull = open("/dev/null", fd ? O_WRONLY : O_RDONLY);
 800
 801         if (devnull >= 0)
 802                 dup2(devnull, fd);
 803
 804         if (devnull > STDERR_FILENO)
 805                 close(devnull);
 806 }
 807
 808 static int exec_mount(const char *source, const char *target,
 809                       const char *fstype, const char *options)
 810 {
 811         pid_t pid;
 812         struct stat s;
 813         FILE *mount_fd;
 814         int err, status, pfds[2];
 815         char errmsg[128], cmd[sizeof("/sbin/mount.XXXXXXXXXXXXXXXX\0")];
 816
 817         snprintf(cmd, sizeof(cmd), "/sbin/mount.%s", fstype);
 818
 819         if (stat(cmd, &s) < 0 || !S_ISREG(s.st_mode) || !(s.st_mode & S_IXUSR)) {
 820                 ULOG_ERR("No \"mount.%s\" utility available\n", fstype);
 821                 return -1;
 822         }
 823
 824         if (pipe(pfds) < 0)
 825                 return -1;
 826
 827         fcntl(pfds[0], F_SETFD, fcntl(pfds[0], F_GETFD) | FD_CLOEXEC);
 828         fcntl(pfds[1], F_SETFD, fcntl(pfds[1], F_GETFD) | FD_CLOEXEC);
 829
 830         pid = vfork();
 831
 832         switch (pid) {
 833         case -1:
 834                 close(pfds[0]);
 835                 close(pfds[1]);
 836
 837                 return -1;
 838
 839         case 0:
 840                 to_devnull(STDIN_FILENO);
 841                 to_devnull(STDOUT_FILENO);
 842
 843                 dup2(pfds[1], STDERR_FILENO);
 844                 close(pfds[0]);
 845                 close(pfds[1]);
 846
 847                 if (options && *options)
 848                         execl(cmd, cmd, "-o", options, source, target, NULL);
 849                 else
 850                         execl(cmd, cmd, source, target, NULL);
 851
 852                 return -1;
 853
 854         default:
 855                 close(pfds[1]);
 856
 857                 mount_fd = fdopen(pfds[0], "r");
 858
 859                 while (fgets(errmsg, sizeof(errmsg), mount_fd))
 860                         ULOG_ERR("mount.%s: %s", fstype, errmsg);
 861
 862                 fclose(mount_fd);
 863
 864                 err = waitpid(pid, &status, 0);
 865
 866                 if (err != -1) {
 867                         if (status != 0) {
 868                                 ULOG_ERR("mount.%s: failed with status %d\n", fstype, status);
 869                                 errno = EINVAL;
 870                                 err = -1;
 871                         } else {
 872                                 errno = 0;
 873                                 err = 0;
 874                         }
 875                 }
 876
 877                 break;
 878         }
 879
 880         return err;
 881 }
 882
 883 static int hotplug_call_mount(const char *action, const char *device)
 884 {
 885         pid_t pid;
 886         int err = 0;
 887
 888         pid = fork();
 889         if (!pid) {
 890                 char * const argv[] = { "hotplug-call", "mount", NULL };
 891
 892                 setenv("ACTION", action, 1);
 893                 setenv("DEVICE", device, 1);
 894
 895                 execv("/sbin/hotplug-call", argv);
 896                 exit(-1);
 897         } else if (pid > 0) {
 898                 int status;
 899
 900                 pid = waitpid(pid, &status, 0);
 901                 if (pid <= 0 || !WIFEXITED(status) || WEXITSTATUS(status)) {
 902                         err = -ENOEXEC;
 903                         ULOG_ERR("hotplug-call call failed\n");
 904                 }
 905         } else {
 906                 err = -errno;
 907         }
 908
 909         return err;
 910 }
 911
 912 static int handle_mount(const char *source, const char *target,
 913                         const char *fstype, struct mount *m)
 914 {
 915         int i, err;
 916         size_t mount_opts_len;
 917         char *mount_opts = NULL, *ptr;
 918
 919         err = mount(source, target, fstype, m ? m->flags : 0,
 920                     (m && m->options) ? m->options : "");
 921
 922         /* Requested file system type is not available in kernel,
 923            attempt to call mount helper. */
 924         if (err == -1 && errno == ENODEV) {
 925                 if (m) {
 926                         /* Convert mount flags back into string representation,
 927                            first calculate needed length of string buffer... */
 928                         mount_opts_len = 1 + (m->options ? strlen(m->options) : 0);
 929
 930                         for (i = 0; i < ARRAY_SIZE(mount_flags); i++)
 931                                 if ((mount_flags[i].flag > 0) &&
 932                                     (mount_flags[i].flag < INT_MAX) &&
 933                                     (m->flags & (uint32_t)mount_flags[i].flag))
 934                                         mount_opts_len += strlen(mount_flags[i].name) + 1;
 935
 936                         /* ... then now allocate and fill it ... */
 937                         ptr = mount_opts = calloc(1, mount_opts_len);
 938
 939                         if (!ptr) {
 940                                 errno = ENOMEM;
 941                                 return -1;
 942                         }
 943
 944                         if (m->options)
 945                                 ptr += sprintf(ptr, "%s,", m->options);
 946
 947                         for (i = 0; i < ARRAY_SIZE(mount_flags); i++)
 948                                 if ((mount_flags[i].flag > 0) &&
 949                                     (mount_flags[i].flag < INT_MAX) &&
 950                                     (m->flags & (uint32_t)mount_flags[i].flag))
 951                                         ptr += sprintf(ptr, "%s,", mount_flags[i].name);
 952
 953                         mount_opts[mount_opts_len - 1] = 0;
 954                 }
 955
 956                 /* ... and now finally invoke the external mount program */
 957                 err = exec_mount(source, target, fstype, mount_opts);
 958         }
 959
 960         return err;
 961 }
 962
 963 static int blockd_notify(char *device, struct mount *m, struct probe_info *pr)
 964 {
 965         struct ubus_context *ctx = ubus_connect(NULL);
 966         uint32_t id;
 967         int err;
 968
 969         if (!ctx)
 970                 return -ENXIO;
 971
 972         if (!ubus_lookup_id(ctx, "block", &id)) {
 973                 struct blob_buf buf = { 0 };
 974                 char *d = strrchr(device, '/');
 975
 976                 if (d)
 977                         d++;
 978                 else
 979                         d = device;
 980
 981                 blob_buf_init(&buf, 0);
 982
 983                 if (m) {
 984
 985                         blobmsg_add_string(&buf, "device", d);
 986                         if (m->uuid)
 987                                 blobmsg_add_string(&buf, "uuid", m->uuid);
 988                         if (m->label)
 989                                 blobmsg_add_string(&buf, "label", m->label);
 990                         if (m->target)
 991                                 blobmsg_add_string(&buf, "target", m->target);
 992                         if (m->options)
 993                                 blobmsg_add_string(&buf, "options", m->options);
 994                         if (m->autofs)
 995                                 blobmsg_add_u32(&buf, "autofs", m->autofs);
 996                         if (pr->type)
 997                                 blobmsg_add_string(&buf, "type", pr->type);
 998                         if (pr->version)
 999                                 blobmsg_add_string(&buf, "version", pr->version);
1000                 } else if (pr) {
1001                         blobmsg_add_string(&buf, "device", d);
1002                         if (pr->uuid)
1003                                 blobmsg_add_string(&buf, "uuid", pr->uuid);
1004                         if (pr->label)
1005                                 blobmsg_add_string(&buf, "label", pr->label);
1006                         if (pr->type)
1007                                 blobmsg_add_string(&buf, "type", pr->type);
1008                         if (pr->version)
1009                                 blobmsg_add_string(&buf, "version", pr->version);
1010                         blobmsg_add_u32(&buf, "anon", 1);
1011                 } else {
1012                         blobmsg_add_string(&buf, "device", d);
1013                         blobmsg_add_u32(&buf, "remove", 1);
1014                 }
1015
1016                 err = ubus_invoke(ctx, id, "hotplug", buf.head, NULL, NULL, 3000);
1017         } else {
1018                 err = -ENOENT;
1019         }
1020
1021         ubus_free(ctx);
1022
1023         return err;
1024 }
1025
1026 static int mount_device(struct probe_info *pr, int type)
1027 {
1028         struct mount *m;
1029         char _target[32];
1030         char *target;
1031         char *device;
1032         char *mp;
1033         int err;
1034
1035         if (!pr)
1036                 return -1;
1037
1038         device = basename(pr->dev);
1039
1040         if (!strcmp(pr->type, "swap")) {
1041                 if ((type == TYPE_HOTPLUG) && !auto_swap)
1042                         return -1;
1043                 m = find_swap(pr->uuid, pr->label, device);
1044                 if (m || anon_swap)
1045                         swapon(pr->dev, (m) ? (m->prio) : (0));
1046
1047                 return 0;
1048         }
1049
1050         mp = find_mount_point(pr->dev);
1051         if (mp && (type != TYPE_HOTPLUG)) {
1052                 ULOG_ERR("%s is already mounted on %s\n", pr->dev, mp);
1053                 free(mp);
1054                 return -1;
1055         }
1056
1057         m = find_block(pr->uuid, pr->label, device, NULL);
1058         if (m && m->extroot)
1059                 return -1;
1060
1061         if (type == TYPE_HOTPLUG)
1062                 blockd_notify(device, m, pr);
1063
1064         /* Check if device should be mounted & set the target directory */
1065         if (m) {
1066                 switch (type) {
1067                 case TYPE_HOTPLUG:
1068                         if (m->autofs)
1069                                 return 0;
1070                         if (!auto_mount)
1071                                 return -1;
1072                         break;
1073                 case TYPE_AUTOFS:
1074                         if (!m->autofs)
1075                                 return -1;
1076                         break;
1077                 case TYPE_DEV:
1078                         if (m->autofs)
1079                                 return -1;
1080                         break;
1081                 }
1082
1083                 if (m->autofs) {
1084                         snprintf(_target, sizeof(_target), "/tmp/run/blockd/%s", device);
1085                         target = _target;
1086                 } else if (m->target) {
1087                         target = m->target;
1088                 } else {
1089                         snprintf(_target, sizeof(_target), "/mnt/%s", device);
1090                         target = _target;
1091                 }
1092         } else if (anon_mount) {
1093                 snprintf(_target, sizeof(_target), "/mnt/%s", device);
1094                 target = _target;
1095         } else {
1096                 /* No reason to mount this device */
1097                 return 0;
1098         }
1099
1100         /* Mount the device */
1101
1102         if (check_fs)
1103                 check_filesystem(pr);
1104
1105         mkdir_p(target);
1106
1107         err = handle_mount(pr->dev, target, pr->type, m);
1108         if (err) {
1109                 ULOG_ERR("mounting %s (%s) as %s failed (%d) - %m\n",
1110                                 pr->dev, pr->type, target, errno);
1111                 return err;
1112         }
1113
1114         handle_swapfiles(true);
1115
1116         if (type != TYPE_AUTOFS)
1117                 hotplug_call_mount("add", device);
1118
1119         return 0;
1120 }
1121
1122 static int umount_device(char *path, int type)
1123 {
1124         char *mp;
1125         int err;
1126
1127         mp = find_mount_point(path);
1128         if (!mp)
1129                 return -1;
1130
1131         if (type != TYPE_AUTOFS)
1132                 hotplug_call_mount("remove", basename(path));
1133
1134         err = umount2(mp, MNT_DETACH);
1135         if (err) {
1136                 ULOG_ERR("unmounting %s (%s) failed (%d) - %m\n", path, mp,
1137                          errno);
1138         } else {
1139                 ULOG_INFO("unmounted %s (%s)\n", path, mp);
1140                 rmdir(mp);
1141         }
1142
1143         free(mp);
1144         return err;
1145 }
1146
1147 static int mount_action(char *action, char *device, int type)
1148 {
1149         char path[32];
1150
1151         if (!action || !device)
1152                 return -1;
1153         snprintf(path, sizeof(path), "/dev/%s", device);
1154
1155         if (!strcmp(action, "remove")) {
1156                 if (type == TYPE_HOTPLUG)
1157                         blockd_notify(device, NULL, NULL);
1158
1159                 umount_device(path, type);
1160
1161                 return 0;
1162         } else if (strcmp(action, "add")) {
1163                 ULOG_ERR("Unkown action %s\n", action);
1164
1165                 return -1;
1166         }
1167
1168         if (config_load(NULL))
1169                 return -1;
1170         cache_load(0);
1171
1172         return mount_device(find_block_info(NULL, NULL, path), type);
1173 }
1174
1175 static int main_hotplug(int argc, char **argv)
1176 {
1177         return mount_action(getenv("ACTION"), getenv("DEVNAME"), TYPE_HOTPLUG);
1178 }
1179
1180 static int main_autofs(int argc, char **argv)
1181 {
1182         int err = 0;
1183
1184         if (argc < 3)
1185                 return -1;
1186
1187         if (!strcmp(argv[2], "start")) {
1188                 struct probe_info *pr;
1189
1190                 if (config_load(NULL))
1191                         return -1;
1192
1193                 cache_load(0);
1194                 list_for_each_entry(pr, &devices, list) {
1195                         struct mount *m;
1196
1197                         if (!strcmp(pr->type, "swap"))
1198                                 continue;
1199
1200                         m = find_block(pr->uuid, pr->label, NULL, NULL);
1201                         if (m && m->extroot)
1202                                 continue;
1203
1204                         blockd_notify(pr->dev, m, pr);
1205                 }
1206         } else if (!strcmp(argv[2], "available")) {
1207                 err = hotplug_call_mount("add", argv[3]);
1208         } else if (!strcmp(argv[2], "unavailable")) {
1209                 err = hotplug_call_mount("remove", argv[3]);
1210         } else {
1211                 if (argc < 4)
1212                         return -EINVAL;
1213
1214                 err = mount_action(argv[2], argv[3], TYPE_AUTOFS);
1215         }
1216
1217         if (err) {
1218                 ULOG_ERR("autofs: \"%s\" action has failed: %d\n", argv[2], err);
1219         }
1220
1221         return err;
1222 }
1223
1224 static int find_block_mtd(char *name, char *part, int plen)
1225 {
1226         FILE *fp = fopen("/proc/mtd", "r");
1227         static char line[256];
1228         char *index = NULL;
1229
1230         if(!fp)
1231                 return -1;
1232
1233         while (!index && fgets(line, sizeof(line), fp)) {
1234                 if (strstr(line, name)) {
1235                         char *eol = strstr(line, ":");
1236
1237                         if (!eol)
1238                                 continue;
1239
1240                         *eol = '\0';
1241                         index = &line[3];
1242                 }
1243         }
1244
1245         fclose(fp);
1246
1247         if (!index)
1248                 return -1;
1249
1250         snprintf(part, plen, "/dev/mtdblock%s", index);
1251
1252         return 0;
1253 }
1254
1255 #ifdef UBIFS_EXTROOT
1256 static int find_ubi_vol(libubi_t libubi, char *name, int *dev_num, int *vol_id)
1257 {
1258         int dev = 0;
1259
1260         while (ubi_dev_present(libubi, dev))
1261         {
1262                 struct ubi_dev_info dev_info;
1263                 struct ubi_vol_info vol_info;
1264
1265                 if (ubi_get_dev_info1(libubi, dev++, &dev_info))
1266                         continue;
1267                 if (ubi_get_vol_info1_nm(libubi, dev_info.dev_num, name, &vol_info))
1268                         continue;
1269
1270                 *dev_num = dev_info.dev_num;
1271                 *vol_id = vol_info.vol_id;
1272
1273                 return 0;
1274         }
1275
1276         return -1;
1277 }
1278
1279 static int find_block_ubi(libubi_t libubi, char *name, char *part, int plen)
1280 {
1281         int dev_num;
1282         int vol_id;
1283         int err = -1;
1284
1285         err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
1286         if (!err)
1287                 snprintf(part, plen, "/dev/ubi%d_%d", dev_num, vol_id);
1288
1289         return err;
1290 }
1291
1292 static int find_block_ubi_RO(libubi_t libubi, char *name, char *part, int plen)
1293 {
1294         int dev_num;
1295         int vol_id;
1296         int err = -1;
1297
1298         err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
1299         if (!err)
1300                 snprintf(part, plen, "/dev/ubiblock%d_%d", dev_num, vol_id);
1301
1302         return err;
1303 }
1304
1305 #else
1306
1307 static int find_root_dev(char *buf, int len)
1308 {
1309         DIR *d;
1310         dev_t root;
1311         struct stat s;
1312         struct dirent *e;
1313
1314         if (stat("/", &s))
1315                 return -1;
1316
1317         if (!(d = opendir("/dev")))
1318                 return -1;
1319
1320         root = s.st_dev;
1321
1322         while ((e = readdir(d)) != NULL) {
1323                 snprintf(buf, len, "/dev/%s", e->d_name);
1324
1325                 if (stat(buf, &s) || s.st_rdev != root)
1326                         continue;
1327
1328                 closedir(d);
1329                 return 0;
1330         }
1331
1332         closedir(d);
1333         return -1;
1334 }
1335
1336 #endif
1337
1338 static int test_fs_support(const char *name)
1339 {
1340         char line[128], *p;
1341         int rv = -1;
1342         FILE *f;
1343
1344         if ((f = fopen("/proc/filesystems", "r")) != NULL) {
1345                 while (fgets(line, sizeof(line), f)) {
1346                         p = strtok(line, "\t\n");
1347
1348                         if (p && !strcmp(p, "nodev"))
1349                                 p = strtok(NULL, "\t\n");
1350
1351                         if (p && !strcmp(p, name)) {
1352                                 rv = 0;
1353                                 break;
1354                         }
1355                 }
1356                 fclose(f);
1357         }
1358
1359         return rv;
1360 }
1361
1362 static int check_extroot(char *path)
1363 {
1364         struct probe_info *pr = NULL;
1365         char devpath[32];
1366
1367 #ifdef UBIFS_EXTROOT
1368         if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) {
1369                 int err = -1;
1370                 libubi_t libubi;
1371
1372                 libubi = libubi_open();
1373                 err = find_block_ubi_RO(libubi, "rootfs", devpath, sizeof(devpath));
1374                 libubi_close(libubi);
1375                 if (err)
1376                         return -1;
1377         }
1378 #else
1379         if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) {
1380                 if (find_root_dev(devpath, sizeof(devpath))) {
1381                         ULOG_ERR("extroot: unable to determine root device\n");
1382                         return -1;
1383                 }
1384         }
1385 #endif
1386
1387         list_for_each_entry(pr, &devices, list) {
1388                 if (!strcmp(pr->dev, devpath)) {
1389                         struct stat s;
1390                         FILE *fp = NULL;
1391                         char tag[64];
1392                         char uuid[64] = { 0 };
1393
1394                         snprintf(tag, sizeof(tag), "%s/etc", path);
1395                         if (stat(tag, &s))
1396                                 mkdir_p(tag);
1397
1398                         snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
1399                         if (stat(tag, &s)) {
1400                                 fp = fopen(tag, "w+");
1401                                 if (!fp) {
1402                                         ULOG_ERR("extroot: failed to write UUID to %s: %d (%m)\n",
1403                                                  tag, errno);
1404                                         /* return 0 to continue boot regardless of error */
1405                                         return 0;
1406                                 }
1407                                 fputs(pr->uuid, fp);
1408                                 fclose(fp);
1409                                 return 0;
1410                         }
1411
1412                         fp = fopen(tag, "r");
1413                         if (!fp) {
1414                                 ULOG_ERR("extroot: failed to read UUID from %s: %d (%m)\n",
1415                                          tag, errno);
1416                                 return -1;
1417                         }
1418
1419                         if (!fgets(uuid, sizeof(uuid), fp))
1420                                 ULOG_ERR("extroot: failed to read UUID from %s: %d (%m)\n",
1421                                          tag, errno);
1422                         fclose(fp);
1423
1424                         if (*uuid && !strcasecmp(uuid, pr->uuid))
1425                                 return 0;
1426
1427                         ULOG_ERR("extroot: UUID mismatch (root: %s, %s: %s)\n",
1428                                  pr->uuid, basename(path), uuid);
1429                         return -1;
1430                 }
1431         }
1432
1433         ULOG_ERR("extroot: unable to lookup root device %s\n", devpath);
1434         return -1;
1435 }
1436
1437 /*
1438  * Read info about extroot from UCI (using prefix) and mount it.
1439  */
1440 static int mount_extroot(char *cfg)
1441 {
1442         char overlay[] = "/tmp/extroot/overlay";
1443         char mnt[] = "/tmp/extroot/mnt";
1444         char *path = mnt;
1445         struct probe_info *pr;
1446         struct mount *m;
1447         int err = -1;
1448
1449         /* Load @cfg/etc/config/fstab */
1450         if (config_load(cfg))
1451                 return -2;
1452
1453         /* See if there is extroot-specific mount config */
1454         m = find_block(NULL, NULL, NULL, "/");
1455         if (!m)
1456                 m = find_block(NULL, NULL, NULL, "/overlay");
1457
1458         if (!m || !m->extroot)
1459         {
1460                 ULOG_INFO("extroot: not configured\n");
1461                 return -1;
1462         }
1463
1464         /* Find block device pointed by the mount config */
1465         pr = find_block_info(m->uuid, m->label, m->device);
1466
1467         if (!pr && delay_root){
1468                 ULOG_INFO("extroot: device not present, retrying in %u seconds\n", delay_root);
1469                 sleep(delay_root);
1470                 make_devs();
1471                 cache_load(0);
1472                 pr = find_block_info(m->uuid, m->label, m->device);
1473         }
1474         if (pr) {
1475                 if (strncmp(pr->type, "ext", 3) &&
1476                     strncmp(pr->type, "f2fs", 4) &&
1477                     strncmp(pr->type, "btrfs", 5) &&
1478                     strncmp(pr->type, "ntfs", 4) &&
1479                     strncmp(pr->type, "ubifs", 5)) {
1480                         ULOG_ERR("extroot: unsupported filesystem %s, try ext4, f2fs, btrfs, ntfs or ubifs\n", pr->type);
1481                         return -1;
1482                 }
1483
1484                 if (test_fs_support(pr->type)) {
1485                         ULOG_ERR("extroot: filesystem %s not supported by kernel\n", pr->type);
1486                         return -1;
1487                 }
1488
1489                 if (m->overlay)
1490                         path = overlay;
1491                 mkdir_p(path);
1492
1493                 if (check_fs)
1494                         check_filesystem(pr);
1495
1496                 err = mount(pr->dev, path, pr->type, m->flags,
1497                             (m->options) ? (m->options) : (""));
1498
1499                 if (err) {
1500                         ULOG_ERR("extroot: mounting %s (%s) on %s failed: %d (%m)\n",
1501                                  pr->dev, pr->type, path, errno);
1502                 } else if (m->overlay) {
1503                         err = check_extroot(path);
1504                         if (err)
1505                                 umount(path);
1506                 }
1507         } else {
1508                 ULOG_ERR("extroot: cannot find device %s%s\n",
1509                          (m->uuid ? "with UUID " : (m->label ? "with label " : "")),
1510                          (m->uuid ? m->uuid : (m->label ? m->label : m->device)));
1511         }
1512
1513         return err;
1514 }
1515
1516 static int main_extroot(int argc, char **argv)
1517 {
1518         struct probe_info *pr;
1519         char blkdev_path[32] = { 0 };
1520         int err = -1;
1521 #ifdef UBIFS_EXTROOT
1522         libubi_t libubi;
1523 #endif
1524
1525         if (!getenv("PREINIT"))
1526                 return -1;
1527
1528         if (argc != 2) {
1529                 ULOG_ERR("Usage: block extroot\n");
1530                 return -1;
1531         }
1532
1533         make_devs();
1534         cache_load(1);
1535
1536         /* enable LOG_INFO messages */
1537         ulog_threshold(LOG_INFO);
1538
1539         /*
1540          * Look for "rootfs_data". We will want to mount it and check for
1541          * extroot configuration.
1542          */
1543
1544         /* Start with looking for MTD partition */
1545         find_block_mtd("\"rootfs_data\"", blkdev_path, sizeof(blkdev_path));
1546         if (blkdev_path[0]) {
1547                 pr = find_block_info(NULL, NULL, blkdev_path);
1548                 if (pr && !strcmp(pr->type, "jffs2")) {
1549                         char cfg[] = "/tmp/jffs_cfg";
1550
1551                         /*
1552                          * Mount MTD part and try extroot (using
1553                          * /etc/config/fstab from that partition)
1554                          */
1555                         mkdir_p(cfg);
1556                         if (!mount(blkdev_path, cfg, "jffs2", MS_NOATIME, NULL)) {
1557                                 err = mount_extroot(cfg);
1558                                 umount2(cfg, MNT_DETACH);
1559                         }
1560                         if (err < 0)
1561                                 rmdir("/tmp/overlay");
1562                         rmdir(cfg);
1563                         return err;
1564                 }
1565         }
1566
1567 #ifdef UBIFS_EXTROOT
1568         /* ... but it also could be an UBI volume */
1569         memset(blkdev_path, 0, sizeof(blkdev_path));
1570         libubi = libubi_open();
1571         find_block_ubi(libubi, "rootfs_data", blkdev_path, sizeof(blkdev_path));
1572         libubi_close(libubi);
1573         if (blkdev_path[0]) {
1574                 char cfg[] = "/tmp/ubifs_cfg";
1575
1576                 /* Mount volume and try extroot (using fstab from that vol) */
1577                 mkdir_p(cfg);
1578                 if (!mount(blkdev_path, cfg, "ubifs", MS_NOATIME, NULL)) {
1579                         err = mount_extroot(cfg);
1580                         umount2(cfg, MNT_DETACH);
1581                 }
1582                 if (err < 0)
1583                         rmdir("/tmp/overlay");
1584                 rmdir(cfg);
1585                 return err;
1586        }
1587 #endif
1588
1589         return mount_extroot(NULL);
1590 }
1591
1592 static int main_mount(int argc, char **argv)
1593 {
1594         struct probe_info *pr;
1595
1596         if (config_load(NULL))
1597                 return -1;
1598
1599         cache_load(1);
1600         list_for_each_entry(pr, &devices, list)
1601                 mount_device(pr, TYPE_DEV);
1602
1603         handle_swapfiles(true);
1604
1605         return 0;
1606 }
1607
1608 static int main_umount(int argc, char **argv)
1609 {
1610         struct probe_info *pr;
1611
1612         if (config_load(NULL))
1613                 return -1;
1614
1615         handle_swapfiles(false);
1616
1617         cache_load(0);
1618         list_for_each_entry(pr, &devices, list) {
1619                 struct mount *m;
1620
1621                 if (!strcmp(pr->type, "swap"))
1622                         continue;
1623
1624                 m = find_block(pr->uuid, pr->label, basename(pr->dev), NULL);
1625                 if (m && m->extroot)
1626                         continue;
1627
1628                 umount_device(pr->dev, TYPE_DEV);
1629         }
1630
1631         return 0;
1632 }
1633
1634 static int main_detect(int argc, char **argv)
1635 {
1636         struct probe_info *pr;
1637
1638         cache_load(0);
1639         printf("config 'global'\n");
1640         printf("\toption\tanon_swap\t'0'\n");
1641         printf("\toption\tanon_mount\t'0'\n");
1642         printf("\toption\tauto_swap\t'1'\n");
1643         printf("\toption\tauto_mount\t'1'\n");
1644         printf("\toption\tdelay_root\t'5'\n");
1645         printf("\toption\tcheck_fs\t'0'\n\n");
1646         list_for_each_entry(pr, &devices, list)
1647                 print_block_uci(pr);
1648
1649         return 0;
1650 }
1651
1652 static int main_info(int argc, char **argv)
1653 {
1654         int i;
1655         struct probe_info *pr;
1656
1657         cache_load(1);
1658         if (argc == 2) {
1659                 list_for_each_entry(pr, &devices, list)
1660                         print_block_info(pr);
1661
1662                 return 0;
1663         };
1664
1665         for (i = 2; i < argc; i++) {
1666                 struct stat s;
1667
1668                 if (stat(argv[i], &s)) {
1669                         ULOG_ERR("failed to stat %s\n", argv[i]);
1670                         continue;
1671                 }
1672                 if (!S_ISBLK(s.st_mode) && !(S_ISCHR(s.st_mode) && major(s.st_rdev) == 250)) {
1673                         ULOG_ERR("%s is not a block device\n", argv[i]);
1674                         continue;
1675                 }
1676                 pr = find_block_info(NULL, NULL, argv[i]);
1677                 if (pr)
1678                         print_block_info(pr);
1679         }
1680
1681         return 0;
1682 }
1683
1684 static int swapon_usage(void)
1685 {
1686         fprintf(stderr, "Usage: swapon [-s] [-a] [[-p pri] DEVICE]\n\n"
1687                 "\tStart swapping on [DEVICE]\n"
1688                 " -a\tStart swapping on all swap devices\n"
1689                 " -p pri\tSet priority of swap device\n"
1690                 " -s\tShow summary\n");
1691         return -1;
1692 }
1693
1694 static int main_swapon(int argc, char **argv)
1695 {
1696         int ch;
1697         FILE *fp;
1698         char *lineptr;
1699         size_t s;
1700         struct probe_info *pr;
1701         int flags = 0;
1702         int pri;
1703         struct stat st;
1704         int err;
1705
1706         while ((ch = getopt(argc, argv, "ap:s")) != -1) {
1707                 switch(ch) {
1708                 case 's':
1709                         fp = fopen("/proc/swaps", "r");
1710                         lineptr = NULL;
1711
1712                         if (!fp) {
1713                                 ULOG_ERR("failed to open /proc/swaps\n");
1714                                 return -1;
1715                         }
1716                         while (getline(&lineptr, &s, fp) > 0)
1717                                 printf("%s", lineptr);
1718                         if (lineptr)
1719                                 free(lineptr);
1720                         fclose(fp);
1721                         return 0;
1722                 case 'a':
1723                         cache_load(0);
1724                         list_for_each_entry(pr, &devices, list) {
1725                                 if (strcmp(pr->type, "swap"))
1726                                         continue;
1727                                 if (swapon(pr->dev, 0))
1728                                         ULOG_ERR("failed to swapon %s\n", pr->dev);
1729                         }
1730                         return 0;
1731                 case 'p':
1732                         pri = atoi(optarg);
1733                         if (pri >= 0)
1734                                 flags = ((pri << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
1735                         break;
1736                 default:
1737                         return swapon_usage();
1738                 }
1739
1740         }
1741
1742         if (optind != (argc - 1))
1743                 return swapon_usage();
1744
1745         if (stat(argv[optind], &st) || (!S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))) {
1746                 ULOG_ERR("%s is not a block device or file\n", argv[optind]);
1747                 return -1;
1748         }
1749         err = swapon(argv[optind], flags);
1750         if (err) {
1751                 ULOG_ERR("failed to swapon %s (%d)\n", argv[optind], err);
1752                 return err;
1753         }
1754
1755         return 0;
1756 }
1757
1758 static int main_swapoff(int argc, char **argv)
1759 {
1760         if (argc != 2) {
1761                 ULOG_ERR("Usage: swapoff [-a] [DEVICE]\n\n"
1762                         "\tStop swapping on DEVICE\n"
1763                         " -a\tStop swapping on all swap devices\n");
1764                 return -1;
1765         }
1766
1767         if (!strcmp(argv[1], "-a")) {
1768                 FILE *fp = fopen("/proc/swaps", "r");
1769                 char line[256];
1770
1771                 if (!fp) {
1772                         ULOG_ERR("failed to open /proc/swaps\n");
1773                         return -1;
1774                 }
1775                 if (fgets(line, sizeof(line), fp))
1776                         while (fgets(line, sizeof(line), fp)) {
1777                                 char *end = strchr(line, ' ');
1778                                 int err;
1779
1780                                 if (!end)
1781                                         continue;
1782                                 *end = '\0';
1783                                 err = swapoff(line);
1784                                 if (err)
1785                                         ULOG_ERR("failed to swapoff %s (%d)\n", line, err);
1786                         }
1787                 fclose(fp);
1788         } else {
1789                 struct stat s;
1790                 int err;
1791
1792                 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1793                         ULOG_ERR("%s is not a block device or file\n", argv[1]);
1794                         return -1;
1795                 }
1796                 err = swapoff(argv[1]);
1797                 if (err) {
1798                         ULOG_ERR("failed to swapoff %s (%d)\n", argv[1], err);
1799                         return err;
1800                 }
1801         }
1802
1803         return 0;
1804 }
1805
1806 int main(int argc, char **argv)
1807 {
1808         char *base = basename(*argv);
1809
1810         umask(0);
1811
1812         ulog_open(-1, -1, "block");
1813         ulog_threshold(LOG_NOTICE);
1814
1815         if (!strcmp(base, "swapon"))
1816                 return main_swapon(argc, argv);
1817
1818         if (!strcmp(base, "swapoff"))
1819                 return main_swapoff(argc, argv);
1820
1821         if ((argc > 1) && !strcmp(base, "block")) {
1822                 if (!strcmp(argv[1], "info"))
1823                         return main_info(argc, argv);
1824
1825                 if (!strcmp(argv[1], "detect"))
1826                         return main_detect(argc, argv);
1827
1828                 if (!strcmp(argv[1], "hotplug"))
1829                         return main_hotplug(argc, argv);
1830
1831                 if (!strcmp(argv[1], "autofs"))
1832                         return main_autofs(argc, argv);
1833
1834                 if (!strcmp(argv[1], "extroot"))
1835                         return main_extroot(argc, argv);
1836
1837                 if (!strcmp(argv[1], "mount"))
1838                         return main_mount(argc, argv);
1839
1840                 if (!strcmp(argv[1], "umount"))
1841                         return main_umount(argc, argv);
1842
1843                 if (!strcmp(argv[1], "remount")) {
1844                         int ret = main_umount(argc, argv);
1845
1846                         if (!ret)
1847                                 ret = main_mount(argc, argv);
1848                         return ret;
1849                 }
1850         }
1851
1852         ULOG_ERR("Usage: block <info|mount|umount|detect>\n");
1853
1854         return -1;
1855 }