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         char *point = NULL, *pos, *tmp, *cpoint, *devname;
 583         struct stat s;
 584         int rstat;
 585         unsigned int minor, major;
 586
 587         if (!fp)
 588                 return NULL;
 589
 590         rstat = stat(block, &s);
 591
 592         while (fgets(line, sizeof(line), fp)) {
 593                 pos = strchr(line, ' ');
 594                 if (!pos)
 595                         continue;
 596
 597                 pos = strchr(pos + 1, ' ');
 598                 if (!pos)
 599                         continue;
 600
 601                 tmp = ++pos;
 602                 pos = strchr(pos, ':');
 603                 if (!pos)
 604                         continue;
 605
 606                 *pos = '\0';
 607                 major = atoi(tmp);
 608                 tmp = ++pos;
 609                 pos = strchr(pos, ' ');
 610                 if (!pos)
 611                         continue;
 612
 613                 *pos = '\0';
 614                 minor = atoi(tmp);
 615                 pos = strchr(pos + 1, ' ');
 616                 if (!pos)
 617                         continue;
 618                 tmp = ++pos;
 619
 620                 pos = strchr(pos, ' ');
 621                 if (!pos)
 622                         continue;
 623                 *pos = '\0';
 624                 cpoint = tmp;
 625
 626                 pos = strchr(pos + 1, ' ');
 627                 if (!pos)
 628                         continue;
 629
 630                 pos = strchr(pos + 1, ' ');
 631                 if (!pos)
 632                         continue;
 633
 634                 pos = strchr(pos + 1, ' ');
 635                 if (!pos)
 636                         continue;
 637
 638                 tmp = ++pos;
 639                 pos = strchr(pos, ' ');
 640                 if (!pos)
 641                         continue;
 642
 643                 *pos = '\0';
 644                 devname = tmp;
 645                 if (!strcmp(block, devname)) {
 646                         point = strdup(cpoint);
 647                         break;
 648                 }
 649
 650                 if (rstat)
 651                         continue;
 652
 653                 if (!S_ISBLK(s.st_mode))
 654                         continue;
 655
 656                 if (major == major(s.st_rdev) &&
 657                     minor == minor(s.st_rdev)) {
 658                         point = strdup(cpoint);
 659                         break;
 660                 }
 661         }
 662
 663         fclose(fp);
 664
 665         return point;
 666 }
 667
 668 static int print_block_info(struct probe_info *pr)
 669 {
 670         static char *mp;
 671
 672         mp = find_mount_point(pr->dev);
 673         printf("%s:", pr->dev);
 674         if (pr->uuid)
 675                 printf(" UUID=\"%s\"", pr->uuid);
 676
 677         if (pr->label)
 678                 printf(" LABEL=\"%s\"", pr->label);
 679
 680         if (pr->version)
 681                 printf(" VERSION=\"%s\"", pr->version);
 682
 683         if (mp) {
 684                 printf(" MOUNT=\"%s\"", mp);
 685                 free(mp);
 686         }
 687
 688         printf(" TYPE=\"%s\"\n", pr->type);
 689
 690         return 0;
 691 }
 692
 693 static void mkdir_p(char *dir)
 694 {
 695         char *l = strrchr(dir, '/');
 696
 697         if (l) {
 698                 *l = '\0';
 699                 mkdir_p(dir);
 700                 *l = '/';
 701                 mkdir(dir, 0755);
 702         }
 703 }
 704
 705 static void check_filesystem(struct probe_info *pr)
 706 {
 707         pid_t pid;
 708         struct stat statbuf;
 709         const char *e2fsck = "/usr/sbin/e2fsck";
 710         const char *f2fsck = "/usr/sbin/fsck.f2fs";
 711         const char *dosfsck = "/usr/sbin/dosfsck";
 712         const char *btrfsck = "/usr/bin/btrfsck";
 713         const char *ntfsck = "/usr/bin/ntfsfix";
 714         const char *ckfs;
 715
 716         /* UBIFS does not need stuff like fsck */
 717         if (!strncmp(pr->type, "ubifs", 5))
 718                 return;
 719
 720         if (!strncmp(pr->type, "vfat", 4)) {
 721                 ckfs = dosfsck;
 722         } else if (!strncmp(pr->type, "f2fs", 4)) {
 723                 ckfs = f2fsck;
 724         } else if (!strncmp(pr->type, "ext", 3)) {
 725                 ckfs = e2fsck;
 726         } else if (!strncmp(pr->type, "btrfs", 5)) {
 727                 ckfs = btrfsck;
 728         } else if (!strncmp(pr->type, "ntfs", 4)) {
 729                 ckfs = ntfsck;
 730         } else {
 731                 ULOG_ERR("check_filesystem: %s is not supported\n", pr->type);
 732                 return;
 733         }
 734
 735         if (stat(ckfs, &statbuf) < 0) {
 736                 ULOG_ERR("check_filesystem: %s not found\n", ckfs);
 737                 return;
 738         }
 739
 740         pid = fork();
 741         if (!pid) {
 742                 if(!strncmp(pr->type, "f2fs", 4)) {
 743                         execl(ckfs, ckfs, "-f", pr->dev, NULL);
 744                         exit(EXIT_FAILURE);
 745                 } else if(!strncmp(pr->type, "btrfs", 5)) {
 746                         execl(ckfs, ckfs, "--repair", pr->dev, NULL);
 747                         exit(EXIT_FAILURE);
 748                 } else if(!strncmp(pr->type, "ntfs", 4)) {
 749                         execl(ckfs, ckfs, "-b", pr->dev, NULL);
 750                         exit(EXIT_FAILURE);
 751                 } else {
 752                         execl(ckfs, ckfs, "-p", pr->dev, NULL);
 753                         exit(EXIT_FAILURE);
 754                 }
 755         } else if (pid > 0) {
 756                 int status;
 757
 758                 waitpid(pid, &status, 0);
 759                 if (WIFEXITED(status) && WEXITSTATUS(status))
 760                         ULOG_ERR("check_filesystem: %s returned %d\n", ckfs, WEXITSTATUS(status));
 761                 if (WIFSIGNALED(status))
 762                         ULOG_ERR("check_filesystem: %s terminated by %s\n", ckfs, strsignal(WTERMSIG(status)));
 763         }
 764 }
 765
 766 static void handle_swapfiles(bool on)
 767 {
 768         struct stat s;
 769         struct mount *m;
 770         struct probe_info *pr;
 771
 772         vlist_for_each_element(&mounts, m, node)
 773         {
 774                 if (m->type != TYPE_SWAP || !m->target)
 775                         continue;
 776
 777                 if (stat(m->target, &s) || !S_ISREG(s.st_mode))
 778                         continue;
 779
 780                 pr = _probe_path(m->target);
 781
 782                 if (!pr)
 783                         continue;
 784
 785                 if (!strcmp(pr->type, "swap")) {
 786                         if (on)
 787                                 swapon(pr->dev, m->prio);
 788                         else
 789                                 swapoff(pr->dev);
 790                 }
 791
 792                 free(pr);
 793         }
 794 }
 795
 796 static void to_devnull(int fd)
 797 {
 798         int devnull = open("/dev/null", fd ? O_WRONLY : O_RDONLY);
 799
 800         if (devnull >= 0)
 801                 dup2(devnull, fd);
 802
 803         if (devnull > STDERR_FILENO)
 804                 close(devnull);
 805 }
 806
 807 static int exec_mount(const char *source, const char *target,
 808                       const char *fstype, const char *options)
 809 {
 810         pid_t pid;
 811         struct stat s;
 812         FILE *mount_fd;
 813         int err, status, pfds[2];
 814         char errmsg[128], cmd[sizeof("/sbin/mount.XXXXXXXXXXXXXXXX\0")];
 815
 816         snprintf(cmd, sizeof(cmd), "/sbin/mount.%s", fstype);
 817
 818         if (stat(cmd, &s) < 0 || !S_ISREG(s.st_mode) || !(s.st_mode & S_IXUSR)) {
 819                 ULOG_ERR("No \"mount.%s\" utility available\n", fstype);
 820                 return -1;
 821         }
 822
 823         if (pipe(pfds) < 0)
 824                 return -1;
 825
 826         fcntl(pfds[0], F_SETFD, fcntl(pfds[0], F_GETFD) | FD_CLOEXEC);
 827         fcntl(pfds[1], F_SETFD, fcntl(pfds[1], F_GETFD) | FD_CLOEXEC);
 828
 829         pid = vfork();
 830
 831         switch (pid) {
 832         case -1:
 833                 close(pfds[0]);
 834                 close(pfds[1]);
 835
 836                 return -1;
 837
 838         case 0:
 839                 to_devnull(STDIN_FILENO);
 840                 to_devnull(STDOUT_FILENO);
 841
 842                 dup2(pfds[1], STDERR_FILENO);
 843                 close(pfds[0]);
 844                 close(pfds[1]);
 845
 846                 if (options && *options)
 847                         execl(cmd, cmd, "-o", options, source, target, NULL);
 848                 else
 849                         execl(cmd, cmd, source, target, NULL);
 850
 851                 return -1;
 852
 853         default:
 854                 close(pfds[1]);
 855
 856                 mount_fd = fdopen(pfds[0], "r");
 857
 858                 while (fgets(errmsg, sizeof(errmsg), mount_fd))
 859                         ULOG_ERR("mount.%s: %s", fstype, errmsg);
 860
 861                 fclose(mount_fd);
 862
 863                 err = waitpid(pid, &status, 0);
 864
 865                 if (err != -1) {
 866                         if (status != 0) {
 867                                 ULOG_ERR("mount.%s: failed with status %d\n", fstype, status);
 868                                 errno = EINVAL;
 869                                 err = -1;
 870                         } else {
 871                                 errno = 0;
 872                                 err = 0;
 873                         }
 874                 }
 875
 876                 break;
 877         }
 878
 879         return err;
 880 }
 881
 882 static int hotplug_call_mount(const char *action, const char *device)
 883 {
 884         pid_t pid;
 885         int err = 0;
 886
 887         pid = fork();
 888         if (!pid) {
 889                 char * const argv[] = { "hotplug-call", "mount", NULL };
 890
 891                 setenv("ACTION", action, 1);
 892                 setenv("DEVICE", device, 1);
 893
 894                 execv("/sbin/hotplug-call", argv);
 895                 exit(-1);
 896         } else if (pid > 0) {
 897                 int status;
 898
 899                 pid = waitpid(pid, &status, 0);
 900                 if (pid <= 0 || !WIFEXITED(status) || WEXITSTATUS(status)) {
 901                         err = -ENOEXEC;
 902                         ULOG_ERR("hotplug-call call failed\n");
 903                 }
 904         } else {
 905                 err = -errno;
 906         }
 907
 908         return err;
 909 }
 910
 911 static int handle_mount(const char *source, const char *target,
 912                         const char *fstype, struct mount *m)
 913 {
 914         int i, err;
 915         size_t mount_opts_len;
 916         char *mount_opts = NULL, *ptr;
 917
 918         err = mount(source, target, fstype, m ? m->flags : 0,
 919                     (m && m->options) ? m->options : "");
 920
 921         /* Requested file system type is not available in kernel,
 922            attempt to call mount helper. */
 923         if (err == -1 && errno == ENODEV) {
 924                 if (m) {
 925                         /* Convert mount flags back into string representation,
 926                            first calculate needed length of string buffer... */
 927                         mount_opts_len = 1 + (m->options ? strlen(m->options) : 0);
 928
 929                         for (i = 0; i < ARRAY_SIZE(mount_flags); i++)
 930                                 if ((mount_flags[i].flag > 0) &&
 931                                     (mount_flags[i].flag < INT_MAX) &&
 932                                     (m->flags & (uint32_t)mount_flags[i].flag))
 933                                         mount_opts_len += strlen(mount_flags[i].name) + 1;
 934
 935                         /* ... then now allocate and fill it ... */
 936                         ptr = mount_opts = calloc(1, mount_opts_len);
 937
 938                         if (!ptr) {
 939                                 errno = ENOMEM;
 940                                 return -1;
 941                         }
 942
 943                         if (m->options)
 944                                 ptr += sprintf(ptr, "%s,", m->options);
 945
 946                         for (i = 0; i < ARRAY_SIZE(mount_flags); i++)
 947                                 if ((mount_flags[i].flag > 0) &&
 948                                     (mount_flags[i].flag < INT_MAX) &&
 949                                     (m->flags & (uint32_t)mount_flags[i].flag))
 950                                         ptr += sprintf(ptr, "%s,", mount_flags[i].name);
 951
 952                         mount_opts[mount_opts_len - 1] = 0;
 953                 }
 954
 955                 /* ... and now finally invoke the external mount program */
 956                 err = exec_mount(source, target, fstype, mount_opts);
 957         }
 958
 959         return err;
 960 }
 961
 962 static int blockd_notify(char *device, struct mount *m, struct probe_info *pr)
 963 {
 964         struct ubus_context *ctx = ubus_connect(NULL);
 965         uint32_t id;
 966         int err;
 967
 968         if (!ctx)
 969                 return -ENXIO;
 970
 971         if (!ubus_lookup_id(ctx, "block", &id)) {
 972                 struct blob_buf buf = { 0 };
 973                 char *d = strrchr(device, '/');
 974
 975                 if (d)
 976                         d++;
 977                 else
 978                         d = device;
 979
 980                 blob_buf_init(&buf, 0);
 981
 982                 if (m) {
 983
 984                         blobmsg_add_string(&buf, "device", d);
 985                         if (m->uuid)
 986                                 blobmsg_add_string(&buf, "uuid", m->uuid);
 987                         if (m->label)
 988                                 blobmsg_add_string(&buf, "label", m->label);
 989                         if (m->target)
 990                                 blobmsg_add_string(&buf, "target", m->target);
 991                         if (m->options)
 992                                 blobmsg_add_string(&buf, "options", m->options);
 993                         if (m->autofs)
 994                                 blobmsg_add_u32(&buf, "autofs", m->autofs);
 995                         if (pr->type)
 996                                 blobmsg_add_string(&buf, "type", pr->type);
 997                         if (pr->version)
 998                                 blobmsg_add_string(&buf, "version", pr->version);
 999                 } else if (pr) {
1000                         blobmsg_add_string(&buf, "device", d);
1001                         if (pr->uuid)
1002                                 blobmsg_add_string(&buf, "uuid", pr->uuid);
1003                         if (pr->label)
1004                                 blobmsg_add_string(&buf, "label", pr->label);
1005                         if (pr->type)
1006                                 blobmsg_add_string(&buf, "type", pr->type);
1007                         if (pr->version)
1008                                 blobmsg_add_string(&buf, "version", pr->version);
1009                         blobmsg_add_u32(&buf, "anon", 1);
1010                 } else {
1011                         blobmsg_add_string(&buf, "device", d);
1012                         blobmsg_add_u32(&buf, "remove", 1);
1013                 }
1014
1015                 err = ubus_invoke(ctx, id, "hotplug", buf.head, NULL, NULL, 3000);
1016         } else {
1017                 err = -ENOENT;
1018         }
1019
1020         ubus_free(ctx);
1021
1022         return err;
1023 }
1024
1025 static int mount_device(struct probe_info *pr, int type)
1026 {
1027         struct mount *m;
1028         char _target[32];
1029         char *target;
1030         char *device;
1031         char *mp;
1032         int err;
1033
1034         if (!pr)
1035                 return -1;
1036
1037         device = basename(pr->dev);
1038
1039         if (!strcmp(pr->type, "swap")) {
1040                 if ((type == TYPE_HOTPLUG) && !auto_swap)
1041                         return -1;
1042                 m = find_swap(pr->uuid, pr->label, device);
1043                 if (m || anon_swap)
1044                         swapon(pr->dev, (m) ? (m->prio) : (0));
1045
1046                 return 0;
1047         }
1048
1049         mp = find_mount_point(pr->dev);
1050         if (mp && (type != TYPE_HOTPLUG)) {
1051                 ULOG_ERR("%s is already mounted on %s\n", pr->dev, mp);
1052                 free(mp);
1053                 return -1;
1054         }
1055
1056         m = find_block(pr->uuid, pr->label, device, NULL);
1057         if (m && m->extroot)
1058                 return -1;
1059
1060         if (type == TYPE_HOTPLUG)
1061                 blockd_notify(device, m, pr);
1062
1063         /* Check if device should be mounted & set the target directory */
1064         if (m) {
1065                 switch (type) {
1066                 case TYPE_HOTPLUG:
1067                         if (m->autofs)
1068                                 return 0;
1069                         if (!auto_mount)
1070                                 return -1;
1071                         break;
1072                 case TYPE_AUTOFS:
1073                         if (!m->autofs)
1074                                 return -1;
1075                         break;
1076                 case TYPE_DEV:
1077                         if (m->autofs)
1078                                 return -1;
1079                         break;
1080                 }
1081
1082                 if (m->autofs) {
1083                         snprintf(_target, sizeof(_target), "/tmp/run/blockd/%s", device);
1084                         target = _target;
1085                 } else if (m->target) {
1086                         target = m->target;
1087                 } else {
1088                         snprintf(_target, sizeof(_target), "/mnt/%s", device);
1089                         target = _target;
1090                 }
1091         } else if (anon_mount) {
1092                 snprintf(_target, sizeof(_target), "/mnt/%s", device);
1093                 target = _target;
1094         } else {
1095                 /* No reason to mount this device */
1096                 return 0;
1097         }
1098
1099         /* Mount the device */
1100
1101         if (check_fs)
1102                 check_filesystem(pr);
1103
1104         mkdir_p(target);
1105
1106         err = handle_mount(pr->dev, target, pr->type, m);
1107         if (err) {
1108                 ULOG_ERR("mounting %s (%s) as %s failed (%d) - %m\n",
1109                                 pr->dev, pr->type, target, errno);
1110                 return err;
1111         }
1112
1113         handle_swapfiles(true);
1114
1115         if (type != TYPE_AUTOFS)
1116                 hotplug_call_mount("add", device);
1117
1118         return 0;
1119 }
1120
1121 static int umount_device(char *path, int type)
1122 {
1123         char *mp;
1124         int err;
1125
1126         mp = find_mount_point(path);
1127         if (!mp)
1128                 return -1;
1129
1130         if (type != TYPE_AUTOFS)
1131                 hotplug_call_mount("remove", basename(path));
1132
1133         err = umount2(mp, MNT_DETACH);
1134         if (err) {
1135                 ULOG_ERR("unmounting %s (%s) failed (%d) - %m\n", path, mp,
1136                          errno);
1137         } else {
1138                 ULOG_INFO("unmounted %s (%s)\n", path, mp);
1139                 rmdir(mp);
1140         }
1141
1142         free(mp);
1143         return err;
1144 }
1145
1146 static int mount_action(char *action, char *device, int type)
1147 {
1148         char path[32];
1149
1150         if (!action || !device)
1151                 return -1;
1152         snprintf(path, sizeof(path), "/dev/%s", device);
1153
1154         if (!strcmp(action, "remove")) {
1155                 if (type == TYPE_HOTPLUG)
1156                         blockd_notify(device, NULL, NULL);
1157
1158                 umount_device(path, type);
1159
1160                 return 0;
1161         } else if (strcmp(action, "add")) {
1162                 ULOG_ERR("Unkown action %s\n", action);
1163
1164                 return -1;
1165         }
1166
1167         if (config_load(NULL))
1168                 return -1;
1169         cache_load(0);
1170
1171         return mount_device(find_block_info(NULL, NULL, path), type);
1172 }
1173
1174 static int main_hotplug(int argc, char **argv)
1175 {
1176         return mount_action(getenv("ACTION"), getenv("DEVNAME"), TYPE_HOTPLUG);
1177 }
1178
1179 static int main_autofs(int argc, char **argv)
1180 {
1181         int err = 0;
1182
1183         if (argc < 3)
1184                 return -1;
1185
1186         if (!strcmp(argv[2], "start")) {
1187                 struct probe_info *pr;
1188
1189                 if (config_load(NULL))
1190                         return -1;
1191
1192                 cache_load(0);
1193                 list_for_each_entry(pr, &devices, list) {
1194                         struct mount *m;
1195
1196                         if (!strcmp(pr->type, "swap"))
1197                                 continue;
1198
1199                         m = find_block(pr->uuid, pr->label, NULL, NULL);
1200                         if (m && m->extroot)
1201                                 continue;
1202
1203                         blockd_notify(pr->dev, m, pr);
1204                 }
1205         } else if (!strcmp(argv[2], "available")) {
1206                 err = hotplug_call_mount("add", argv[3]);
1207         } else if (!strcmp(argv[2], "unavailable")) {
1208                 err = hotplug_call_mount("remove", argv[3]);
1209         } else {
1210                 if (argc < 4)
1211                         return -EINVAL;
1212
1213                 err = mount_action(argv[2], argv[3], TYPE_AUTOFS);
1214         }
1215
1216         if (err) {
1217                 ULOG_ERR("autofs: \"%s\" action has failed: %d\n", argv[2], err);
1218         }
1219
1220         return err;
1221 }
1222
1223 static int find_block_mtd(char *name, char *part, int plen)
1224 {
1225         FILE *fp = fopen("/proc/mtd", "r");
1226         static char line[256];
1227         char *index = NULL;
1228
1229         if(!fp)
1230                 return -1;
1231
1232         while (!index && fgets(line, sizeof(line), fp)) {
1233                 if (strstr(line, name)) {
1234                         char *eol = strstr(line, ":");
1235
1236                         if (!eol)
1237                                 continue;
1238
1239                         *eol = '\0';
1240                         index = &line[3];
1241                 }
1242         }
1243
1244         fclose(fp);
1245
1246         if (!index)
1247                 return -1;
1248
1249         snprintf(part, plen, "/dev/mtdblock%s", index);
1250
1251         return 0;
1252 }
1253
1254 #ifdef UBIFS_EXTROOT
1255 static int find_ubi_vol(libubi_t libubi, char *name, int *dev_num, int *vol_id)
1256 {
1257         int dev = 0;
1258
1259         while (ubi_dev_present(libubi, dev))
1260         {
1261                 struct ubi_dev_info dev_info;
1262                 struct ubi_vol_info vol_info;
1263
1264                 if (ubi_get_dev_info1(libubi, dev++, &dev_info))
1265                         continue;
1266                 if (ubi_get_vol_info1_nm(libubi, dev_info.dev_num, name, &vol_info))
1267                         continue;
1268
1269                 *dev_num = dev_info.dev_num;
1270                 *vol_id = vol_info.vol_id;
1271
1272                 return 0;
1273         }
1274
1275         return -1;
1276 }
1277
1278 static int find_block_ubi(libubi_t libubi, char *name, char *part, int plen)
1279 {
1280         int dev_num;
1281         int vol_id;
1282         int err = -1;
1283
1284         err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
1285         if (!err)
1286                 snprintf(part, plen, "/dev/ubi%d_%d", dev_num, vol_id);
1287
1288         return err;
1289 }
1290
1291 static int find_block_ubi_RO(libubi_t libubi, char *name, char *part, int plen)
1292 {
1293         int dev_num;
1294         int vol_id;
1295         int err = -1;
1296
1297         err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
1298         if (!err)
1299                 snprintf(part, plen, "/dev/ubiblock%d_%d", dev_num, vol_id);
1300
1301         return err;
1302 }
1303
1304 #else
1305
1306 static int find_root_dev(char *buf, int len)
1307 {
1308         DIR *d;
1309         dev_t root;
1310         struct stat s;
1311         struct dirent *e;
1312
1313         if (stat("/", &s))
1314                 return -1;
1315
1316         if (!(d = opendir("/dev")))
1317                 return -1;
1318
1319         root = s.st_dev;
1320
1321         while ((e = readdir(d)) != NULL) {
1322                 snprintf(buf, len, "/dev/%s", e->d_name);
1323
1324                 if (stat(buf, &s) || s.st_rdev != root)
1325                         continue;
1326
1327                 closedir(d);
1328                 return 0;
1329         }
1330
1331         closedir(d);
1332         return -1;
1333 }
1334
1335 #endif
1336
1337 static int test_fs_support(const char *name)
1338 {
1339         char line[128], *p;
1340         int rv = -1;
1341         FILE *f;
1342
1343         if ((f = fopen("/proc/filesystems", "r")) != NULL) {
1344                 while (fgets(line, sizeof(line), f)) {
1345                         p = strtok(line, "\t\n");
1346
1347                         if (p && !strcmp(p, "nodev"))
1348                                 p = strtok(NULL, "\t\n");
1349
1350                         if (p && !strcmp(p, name)) {
1351                                 rv = 0;
1352                                 break;
1353                         }
1354                 }
1355                 fclose(f);
1356         }
1357
1358         return rv;
1359 }
1360
1361 static int check_extroot(char *path)
1362 {
1363         struct probe_info *pr = NULL;
1364         char devpath[32];
1365
1366 #ifdef UBIFS_EXTROOT
1367         if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) {
1368                 int err = -1;
1369                 libubi_t libubi;
1370
1371                 libubi = libubi_open();
1372                 err = find_block_ubi_RO(libubi, "rootfs", devpath, sizeof(devpath));
1373                 libubi_close(libubi);
1374                 if (err)
1375                         return -1;
1376         }
1377 #else
1378         if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) {
1379                 if (find_root_dev(devpath, sizeof(devpath))) {
1380                         ULOG_ERR("extroot: unable to determine root device\n");
1381                         return -1;
1382                 }
1383         }
1384 #endif
1385
1386         list_for_each_entry(pr, &devices, list) {
1387                 if (!strcmp(pr->dev, devpath)) {
1388                         struct stat s;
1389                         FILE *fp = NULL;
1390                         char tag[64];
1391                         char uuid[64] = { 0 };
1392
1393                         snprintf(tag, sizeof(tag), "%s/etc", path);
1394                         if (stat(tag, &s))
1395                                 mkdir_p(tag);
1396
1397                         snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
1398                         if (stat(tag, &s)) {
1399                                 fp = fopen(tag, "w+");
1400                                 if (!fp) {
1401                                         ULOG_ERR("extroot: failed to write UUID to %s: %d (%m)\n",
1402                                                  tag, errno);
1403                                         /* return 0 to continue boot regardless of error */
1404                                         return 0;
1405                                 }
1406                                 fputs(pr->uuid, fp);
1407                                 fclose(fp);
1408                                 return 0;
1409                         }
1410
1411                         fp = fopen(tag, "r");
1412                         if (!fp) {
1413                                 ULOG_ERR("extroot: failed to read UUID from %s: %d (%m)\n",
1414                                          tag, errno);
1415                                 return -1;
1416                         }
1417
1418                         if (!fgets(uuid, sizeof(uuid), fp))
1419                                 ULOG_ERR("extroot: failed to read UUID from %s: %d (%m)\n",
1420                                          tag, errno);
1421                         fclose(fp);
1422
1423                         if (*uuid && !strcasecmp(uuid, pr->uuid))
1424                                 return 0;
1425
1426                         ULOG_ERR("extroot: UUID mismatch (root: %s, %s: %s)\n",
1427                                  pr->uuid, basename(path), uuid);
1428                         return -1;
1429                 }
1430         }
1431
1432         ULOG_ERR("extroot: unable to lookup root device %s\n", devpath);
1433         return -1;
1434 }
1435
1436 /*
1437  * Read info about extroot from UCI (using prefix) and mount it.
1438  */
1439 static int mount_extroot(char *cfg)
1440 {
1441         char overlay[] = "/tmp/extroot/overlay";
1442         char mnt[] = "/tmp/extroot/mnt";
1443         char *path = mnt;
1444         struct probe_info *pr;
1445         struct mount *m;
1446         int err = -1;
1447
1448         /* Load @cfg/etc/config/fstab */
1449         if (config_load(cfg))
1450                 return -2;
1451
1452         /* See if there is extroot-specific mount config */
1453         m = find_block(NULL, NULL, NULL, "/");
1454         if (!m)
1455                 m = find_block(NULL, NULL, NULL, "/overlay");
1456
1457         if (!m || !m->extroot)
1458         {
1459                 ULOG_INFO("extroot: not configured\n");
1460                 return -1;
1461         }
1462
1463         /* Find block device pointed by the mount config */
1464         pr = find_block_info(m->uuid, m->label, m->device);
1465
1466         if (!pr && delay_root){
1467                 ULOG_INFO("extroot: device not present, retrying in %u seconds\n", delay_root);
1468                 sleep(delay_root);
1469                 make_devs();
1470                 cache_load(0);
1471                 pr = find_block_info(m->uuid, m->label, m->device);
1472         }
1473         if (pr) {
1474                 if (strncmp(pr->type, "ext", 3) &&
1475                     strncmp(pr->type, "f2fs", 4) &&
1476                     strncmp(pr->type, "btrfs", 5) &&
1477                     strncmp(pr->type, "ntfs", 4) &&
1478                     strncmp(pr->type, "ubifs", 5)) {
1479                         ULOG_ERR("extroot: unsupported filesystem %s, try ext4, f2fs, btrfs, ntfs or ubifs\n", pr->type);
1480                         return -1;
1481                 }
1482
1483                 if (test_fs_support(pr->type)) {
1484                         ULOG_ERR("extroot: filesystem %s not supported by kernel\n", pr->type);
1485                         return -1;
1486                 }
1487
1488                 if (m->overlay)
1489                         path = overlay;
1490                 mkdir_p(path);
1491
1492                 if (check_fs)
1493                         check_filesystem(pr);
1494
1495                 err = mount(pr->dev, path, pr->type, m->flags,
1496                             (m->options) ? (m->options) : (""));
1497
1498                 if (err) {
1499                         ULOG_ERR("extroot: mounting %s (%s) on %s failed: %d (%m)\n",
1500                                  pr->dev, pr->type, path, errno);
1501                 } else if (m->overlay) {
1502                         err = check_extroot(path);
1503                         if (err)
1504                                 umount(path);
1505                 }
1506         } else {
1507                 ULOG_ERR("extroot: cannot find device %s%s\n",
1508                          (m->uuid ? "with UUID " : (m->label ? "with label " : "")),
1509                          (m->uuid ? m->uuid : (m->label ? m->label : m->device)));
1510         }
1511
1512         return err;
1513 }
1514
1515 static int main_extroot(int argc, char **argv)
1516 {
1517         struct probe_info *pr;
1518         char blkdev_path[32] = { 0 };
1519         int err = -1;
1520 #ifdef UBIFS_EXTROOT
1521         libubi_t libubi;
1522 #endif
1523
1524         if (!getenv("PREINIT"))
1525                 return -1;
1526
1527         if (argc != 2) {
1528                 ULOG_ERR("Usage: block extroot\n");
1529                 return -1;
1530         }
1531
1532         make_devs();
1533         cache_load(1);
1534
1535         /* enable LOG_INFO messages */
1536         ulog_threshold(LOG_INFO);
1537
1538         /*
1539          * Look for "rootfs_data". We will want to mount it and check for
1540          * extroot configuration.
1541          */
1542
1543         /* Start with looking for MTD partition */
1544         find_block_mtd("\"rootfs_data\"", blkdev_path, sizeof(blkdev_path));
1545         if (blkdev_path[0]) {
1546                 pr = find_block_info(NULL, NULL, blkdev_path);
1547                 if (pr && !strcmp(pr->type, "jffs2")) {
1548                         char cfg[] = "/tmp/jffs_cfg";
1549
1550                         /*
1551                          * Mount MTD part and try extroot (using
1552                          * /etc/config/fstab from that partition)
1553                          */
1554                         mkdir_p(cfg);
1555                         if (!mount(blkdev_path, cfg, "jffs2", MS_NOATIME, NULL)) {
1556                                 err = mount_extroot(cfg);
1557                                 umount2(cfg, MNT_DETACH);
1558                         }
1559                         if (err < 0)
1560                                 rmdir("/tmp/overlay");
1561                         rmdir(cfg);
1562                         return err;
1563                 }
1564         }
1565
1566 #ifdef UBIFS_EXTROOT
1567         /* ... but it also could be an UBI volume */
1568         memset(blkdev_path, 0, sizeof(blkdev_path));
1569         libubi = libubi_open();
1570         find_block_ubi(libubi, "rootfs_data", blkdev_path, sizeof(blkdev_path));
1571         libubi_close(libubi);
1572         if (blkdev_path[0]) {
1573                 char cfg[] = "/tmp/ubifs_cfg";
1574
1575                 /* Mount volume and try extroot (using fstab from that vol) */
1576                 mkdir_p(cfg);
1577                 if (!mount(blkdev_path, cfg, "ubifs", MS_NOATIME, NULL)) {
1578                         err = mount_extroot(cfg);
1579                         umount2(cfg, MNT_DETACH);
1580                 }
1581                 if (err < 0)
1582                         rmdir("/tmp/overlay");
1583                 rmdir(cfg);
1584                 return err;
1585        }
1586 #endif
1587
1588         return mount_extroot(NULL);
1589 }
1590
1591 static int main_mount(int argc, char **argv)
1592 {
1593         struct probe_info *pr;
1594
1595         if (config_load(NULL))
1596                 return -1;
1597
1598         cache_load(1);
1599         list_for_each_entry(pr, &devices, list)
1600                 mount_device(pr, TYPE_DEV);
1601
1602         handle_swapfiles(true);
1603
1604         return 0;
1605 }
1606
1607 static int main_umount(int argc, char **argv)
1608 {
1609         struct probe_info *pr;
1610
1611         if (config_load(NULL))
1612                 return -1;
1613
1614         handle_swapfiles(false);
1615
1616         cache_load(0);
1617         list_for_each_entry(pr, &devices, list) {
1618                 struct mount *m;
1619
1620                 if (!strcmp(pr->type, "swap"))
1621                         continue;
1622
1623                 m = find_block(pr->uuid, pr->label, basename(pr->dev), NULL);
1624                 if (m && m->extroot)
1625                         continue;
1626
1627                 umount_device(pr->dev, TYPE_DEV);
1628         }
1629
1630         return 0;
1631 }
1632
1633 static int main_detect(int argc, char **argv)
1634 {
1635         struct probe_info *pr;
1636
1637         cache_load(0);
1638         printf("config 'global'\n");
1639         printf("\toption\tanon_swap\t'0'\n");
1640         printf("\toption\tanon_mount\t'0'\n");
1641         printf("\toption\tauto_swap\t'1'\n");
1642         printf("\toption\tauto_mount\t'1'\n");
1643         printf("\toption\tdelay_root\t'5'\n");
1644         printf("\toption\tcheck_fs\t'0'\n\n");
1645         list_for_each_entry(pr, &devices, list)
1646                 print_block_uci(pr);
1647
1648         return 0;
1649 }
1650
1651 static int main_info(int argc, char **argv)
1652 {
1653         int i;
1654         struct probe_info *pr;
1655
1656         cache_load(1);
1657         if (argc == 2) {
1658                 list_for_each_entry(pr, &devices, list)
1659                         print_block_info(pr);
1660
1661                 return 0;
1662         };
1663
1664         for (i = 2; i < argc; i++) {
1665                 struct stat s;
1666
1667                 if (stat(argv[i], &s)) {
1668                         ULOG_ERR("failed to stat %s\n", argv[i]);
1669                         continue;
1670                 }
1671                 if (!S_ISBLK(s.st_mode) && !(S_ISCHR(s.st_mode) && major(s.st_rdev) == 250)) {
1672                         ULOG_ERR("%s is not a block device\n", argv[i]);
1673                         continue;
1674                 }
1675                 pr = find_block_info(NULL, NULL, argv[i]);
1676                 if (pr)
1677                         print_block_info(pr);
1678         }
1679
1680         return 0;
1681 }
1682
1683 static int swapon_usage(void)
1684 {
1685         fprintf(stderr, "Usage: swapon [-s] [-a] [[-p pri] DEVICE]\n\n"
1686                 "\tStart swapping on [DEVICE]\n"
1687                 " -a\tStart swapping on all swap devices\n"
1688                 " -p pri\tSet priority of swap device\n"
1689                 " -s\tShow summary\n");
1690         return -1;
1691 }
1692
1693 static int main_swapon(int argc, char **argv)
1694 {
1695         int ch;
1696         FILE *fp;
1697         char *lineptr;
1698         size_t s;
1699         struct probe_info *pr;
1700         int flags = 0;
1701         int pri;
1702         struct stat st;
1703         int err;
1704
1705         while ((ch = getopt(argc, argv, "ap:s")) != -1) {
1706                 switch(ch) {
1707                 case 's':
1708                         fp = fopen("/proc/swaps", "r");
1709                         lineptr = NULL;
1710
1711                         if (!fp) {
1712                                 ULOG_ERR("failed to open /proc/swaps\n");
1713                                 return -1;
1714                         }
1715                         while (getline(&lineptr, &s, fp) > 0)
1716                                 printf("%s", lineptr);
1717                         if (lineptr)
1718                                 free(lineptr);
1719                         fclose(fp);
1720                         return 0;
1721                 case 'a':
1722                         cache_load(0);
1723                         list_for_each_entry(pr, &devices, list) {
1724                                 if (strcmp(pr->type, "swap"))
1725                                         continue;
1726                                 if (swapon(pr->dev, 0))
1727                                         ULOG_ERR("failed to swapon %s\n", pr->dev);
1728                         }
1729                         return 0;
1730                 case 'p':
1731                         pri = atoi(optarg);
1732                         if (pri >= 0)
1733                                 flags = ((pri << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
1734                         break;
1735                 default:
1736                         return swapon_usage();
1737                 }
1738
1739         }
1740
1741         if (optind != (argc - 1))
1742                 return swapon_usage();
1743
1744         if (stat(argv[optind], &st) || (!S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))) {
1745                 ULOG_ERR("%s is not a block device or file\n", argv[optind]);
1746                 return -1;
1747         }
1748         err = swapon(argv[optind], flags);
1749         if (err) {
1750                 ULOG_ERR("failed to swapon %s (%d)\n", argv[optind], err);
1751                 return err;
1752         }
1753
1754         return 0;
1755 }
1756
1757 static int main_swapoff(int argc, char **argv)
1758 {
1759         if (argc != 2) {
1760                 ULOG_ERR("Usage: swapoff [-a] [DEVICE]\n\n"
1761                         "\tStop swapping on DEVICE\n"
1762                         " -a\tStop swapping on all swap devices\n");
1763                 return -1;
1764         }
1765
1766         if (!strcmp(argv[1], "-a")) {
1767                 FILE *fp = fopen("/proc/swaps", "r");
1768                 char line[256];
1769
1770                 if (!fp) {
1771                         ULOG_ERR("failed to open /proc/swaps\n");
1772                         return -1;
1773                 }
1774                 if (fgets(line, sizeof(line), fp))
1775                         while (fgets(line, sizeof(line), fp)) {
1776                                 char *end = strchr(line, ' ');
1777                                 int err;
1778
1779                                 if (!end)
1780                                         continue;
1781                                 *end = '\0';
1782                                 err = swapoff(line);
1783                                 if (err)
1784                                         ULOG_ERR("failed to swapoff %s (%d)\n", line, err);
1785                         }
1786                 fclose(fp);
1787         } else {
1788                 struct stat s;
1789                 int err;
1790
1791                 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1792                         ULOG_ERR("%s is not a block device or file\n", argv[1]);
1793                         return -1;
1794                 }
1795                 err = swapoff(argv[1]);
1796                 if (err) {
1797                         ULOG_ERR("failed to swapoff %s (%d)\n", argv[1], err);
1798                         return err;
1799                 }
1800         }
1801
1802         return 0;
1803 }
1804
1805 int main(int argc, char **argv)
1806 {
1807         char *base = basename(*argv);
1808
1809         umask(0);
1810
1811         ulog_open(-1, -1, "block");
1812         ulog_threshold(LOG_NOTICE);
1813
1814         if (!strcmp(base, "swapon"))
1815                 return main_swapon(argc, argv);
1816
1817         if (!strcmp(base, "swapoff"))
1818                 return main_swapoff(argc, argv);
1819
1820         if ((argc > 1) && !strcmp(base, "block")) {
1821                 if (!strcmp(argv[1], "info"))
1822                         return main_info(argc, argv);
1823
1824                 if (!strcmp(argv[1], "detect"))
1825                         return main_detect(argc, argv);
1826
1827                 if (!strcmp(argv[1], "hotplug"))
1828                         return main_hotplug(argc, argv);
1829
1830                 if (!strcmp(argv[1], "autofs"))
1831                         return main_autofs(argc, argv);
1832
1833                 if (!strcmp(argv[1], "extroot"))
1834                         return main_extroot(argc, argv);
1835
1836                 if (!strcmp(argv[1], "mount"))
1837                         return main_mount(argc, argv);
1838
1839                 if (!strcmp(argv[1], "umount"))
1840                         return main_umount(argc, argv);
1841
1842                 if (!strcmp(argv[1], "remount")) {
1843                         int ret = main_umount(argc, argv);
1844
1845                         if (!ret)
1846                                 ret = main_mount(argc, argv);
1847                         return ret;
1848                 }
1849         }
1850
1851         ULOG_ERR("Usage: block <info|mount|umount|detect>\n");
1852
1853         return -1;
1854 }