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
  26 #include <sys/stat.h>
  27 #include <sys/types.h>
  28 #include <sys/swap.h>
  29 #include <sys/mount.h>
  30 #include <sys/wait.h>
  31
  32 #include <uci.h>
  33 #include <uci_blob.h>
  34
  35 #include <libubox/ulog.h>
  36 #include <libubox/list.h>
  37 #include <libubox/vlist.h>
  38 #include <libubox/blobmsg_json.h>
  39 #include <libubox/avl-cmp.h>
  40
  41 #include "libblkid-tiny/libblkid-tiny.h"
  42
  43 #ifdef UBIFS_EXTROOT
  44 #include "libubi/libubi.h"
  45 #endif
  46
  47 enum {
  48         TYPE_MOUNT,
  49         TYPE_SWAP,
  50 };
  51
  52 struct mount {
  53         struct vlist_node node;
  54         int type;
  55
  56         char *target;
  57         char *path;
  58         char *options;
  59         uint32_t flags;
  60         char *uuid;
  61         char *label;
  62         char *device;
  63         int extroot;
  64         int overlay;
  65         int disabled_fsck;
  66         unsigned int prio;
  67 };
  68
  69 static struct vlist_tree mounts;
  70 static struct blob_buf b;
  71 static LIST_HEAD(devices);
  72 static int anon_mount, anon_swap, auto_mount, auto_swap, check_fs;
  73 static unsigned int delay_root;
  74
  75 enum {
  76         CFG_ANON_MOUNT,
  77         CFG_ANON_SWAP,
  78         CFG_AUTO_MOUNT,
  79         CFG_AUTO_SWAP,
  80         CFG_DELAY_ROOT,
  81         CFG_CHECK_FS,
  82         __CFG_MAX
  83 };
  84
  85 static const struct blobmsg_policy config_policy[__CFG_MAX] = {
  86         [CFG_ANON_SWAP] = { .name = "anon_swap", .type = BLOBMSG_TYPE_INT32 },
  87         [CFG_ANON_MOUNT] = { .name = "anon_mount", .type = BLOBMSG_TYPE_INT32 },
  88         [CFG_AUTO_SWAP] = { .name = "auto_swap", .type = BLOBMSG_TYPE_INT32 },
  89         [CFG_AUTO_MOUNT] = { .name = "auto_mount", .type = BLOBMSG_TYPE_INT32 },
  90         [CFG_DELAY_ROOT] = { .name = "delay_root", .type = BLOBMSG_TYPE_INT32 },
  91         [CFG_CHECK_FS] = { .name = "check_fs", .type = BLOBMSG_TYPE_INT32 },
  92 };
  93
  94 enum {
  95         MOUNT_UUID,
  96         MOUNT_LABEL,
  97         MOUNT_ENABLE,
  98         MOUNT_TARGET,
  99         MOUNT_DEVICE,
 100         MOUNT_OPTIONS,
 101         __MOUNT_MAX
 102 };
 103
 104 static const struct uci_blob_param_list config_attr_list = {
 105         .n_params = __CFG_MAX,
 106         .params = config_policy,
 107 };
 108
 109 static const struct blobmsg_policy mount_policy[__MOUNT_MAX] = {
 110         [MOUNT_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
 111         [MOUNT_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
 112         [MOUNT_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
 113         [MOUNT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
 114         [MOUNT_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_STRING },
 115         [MOUNT_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
 116 };
 117
 118 static const struct uci_blob_param_list mount_attr_list = {
 119         .n_params = __MOUNT_MAX,
 120         .params = mount_policy,
 121 };
 122
 123 enum {
 124         SWAP_ENABLE,
 125         SWAP_UUID,
 126         SWAP_LABEL,
 127         SWAP_DEVICE,
 128         SWAP_PRIO,
 129         __SWAP_MAX
 130 };
 131
 132 static const struct blobmsg_policy swap_policy[__SWAP_MAX] = {
 133         [SWAP_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
 134         [SWAP_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
 135         [SWAP_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
 136         [SWAP_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
 137         [SWAP_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 },
 138 };
 139
 140 static const struct uci_blob_param_list swap_attr_list = {
 141         .n_params = __SWAP_MAX,
 142         .params = swap_policy,
 143 };
 144
 145 struct mount_flag {
 146         const char *name;
 147         int32_t flag;
 148 };
 149
 150 #ifndef MS_DIRSYNC
 151 #       define MS_DIRSYNC               (1 << 7)
 152 #endif
 153
 154 #ifndef MS_RELATIME
 155 #       define MS_RELATIME              (1 << 21)
 156 #endif
 157
 158 #ifndef MS_STRICTATIME
 159 #       define MS_STRICTATIME   (1 << 24)
 160 #endif
 161
 162 static const struct mount_flag mount_flags[] = {
 163         { "sync",               MS_SYNCHRONOUS  },
 164         { "async",              ~MS_SYNCHRONOUS },
 165         { "dirsync",            MS_DIRSYNC      },
 166         { "mand",               MS_MANDLOCK     },
 167         { "nomand",             ~MS_MANDLOCK    },
 168         { "atime",              ~MS_NOATIME     },
 169         { "noatime",            MS_NOATIME      },
 170         { "dev",                ~MS_NODEV       },
 171         { "nodev",              MS_NODEV        },
 172         { "diratime",           ~MS_NODIRATIME  },
 173         { "nodiratime",         MS_NODIRATIME   },
 174         { "exec",               ~MS_NOEXEC      },
 175         { "noexec",             MS_NOEXEC       },
 176         { "suid",               ~MS_NOSUID      },
 177         { "nosuid",             MS_NOSUID       },
 178         { "rw",                 ~MS_RDONLY      },
 179         { "ro",                 MS_RDONLY       },
 180         { "relatime",           MS_RELATIME     },
 181         { "norelatime",         ~MS_RELATIME    },
 182         { "strictatime",        MS_STRICTATIME  },
 183 };
 184
 185 static char *blobmsg_get_strdup(struct blob_attr *attr)
 186 {
 187         if (!attr)
 188                 return NULL;
 189
 190         return strdup(blobmsg_get_string(attr));
 191 }
 192
 193 static char *blobmsg_get_basename(struct blob_attr *attr)
 194 {
 195         if (!attr)
 196                 return NULL;
 197
 198         return strdup(basename(blobmsg_get_string(attr)));
 199 }
 200
 201 static void parse_mount_options(struct mount *m, char *optstr)
 202 {
 203         int i;
 204         bool is_flag;
 205         char *p, *opts, *last;
 206
 207         m->flags = 0;
 208         m->options = NULL;
 209
 210         if (!optstr || !*optstr)
 211                 return;
 212
 213         m->options = opts = calloc(1, strlen(optstr) + 1);
 214
 215         if (!m->options)
 216                 return;
 217
 218         p = last = optstr;
 219
 220         do {
 221                 p = strchr(p, ',');
 222
 223                 if (p)
 224                         *p++ = 0;
 225
 226                 for (i = 0, is_flag = false; i < ARRAY_SIZE(mount_flags); i++) {
 227                         if (!strcmp(last, mount_flags[i].name)) {
 228                                 if (mount_flags[i].flag < 0)
 229                                         m->flags &= (uint32_t)mount_flags[i].flag;
 230                                 else
 231                                         m->flags |= (uint32_t)mount_flags[i].flag;
 232                                 is_flag = true;
 233                                 break;
 234                         }
 235                 }
 236
 237                 if (!is_flag)
 238                         opts += sprintf(opts, "%s%s", (opts > m->options) ? "," : "", last);
 239
 240                 last = p;
 241
 242         } while (p);
 243
 244         free(optstr);
 245 }
 246
 247 static int mount_add(struct uci_section *s)
 248 {
 249         struct blob_attr *tb[__MOUNT_MAX] = { 0 };
 250         struct mount *m;
 251
 252         blob_buf_init(&b, 0);
 253         uci_to_blob(&b, s, &mount_attr_list);
 254         blobmsg_parse(mount_policy, __MOUNT_MAX, tb, blob_data(b.head), blob_len(b.head));
 255
 256         if (!tb[MOUNT_LABEL] && !tb[MOUNT_UUID] && !tb[MOUNT_DEVICE])
 257                 return -1;
 258
 259         if (tb[MOUNT_ENABLE] && !blobmsg_get_u32(tb[MOUNT_ENABLE]))
 260                 return -1;
 261
 262         m = malloc(sizeof(struct mount));
 263         m->type = TYPE_MOUNT;
 264         m->uuid = blobmsg_get_strdup(tb[MOUNT_UUID]);
 265         m->label = blobmsg_get_strdup(tb[MOUNT_LABEL]);
 266         m->target = blobmsg_get_strdup(tb[MOUNT_TARGET]);
 267         m->device = blobmsg_get_basename(tb[MOUNT_DEVICE]);
 268
 269         parse_mount_options(m, blobmsg_get_strdup(tb[MOUNT_OPTIONS]));
 270
 271         m->overlay = m->extroot = 0;
 272         if (m->target && !strcmp(m->target, "/"))
 273                 m->extroot = 1;
 274         if (m->target && !strcmp(m->target, "/overlay"))
 275                 m->extroot = m->overlay = 1;
 276
 277         if (m->target && *m->target != '/') {
 278                 ULOG_WARN("ignoring mount section %s due to invalid target '%s'\n",
 279                           s->e.name, m->target);
 280                 free(m);
 281                 return -1;
 282         }
 283
 284         if (m->uuid)
 285                 vlist_add(&mounts, &m->node, m->uuid);
 286         else if (m->label)
 287                 vlist_add(&mounts, &m->node, m->label);
 288         else if (m->device)
 289                 vlist_add(&mounts, &m->node, m->device);
 290
 291         return 0;
 292 }
 293
 294 static int swap_add(struct uci_section *s)
 295 {
 296         struct blob_attr *tb[__SWAP_MAX] = { 0 };
 297         struct mount *m;
 298
 299         blob_buf_init(&b, 0);
 300         uci_to_blob(&b, s, &swap_attr_list);
 301         blobmsg_parse(swap_policy, __SWAP_MAX, tb, blob_data(b.head), blob_len(b.head));
 302
 303         if (!tb[SWAP_UUID] && !tb[SWAP_LABEL] && !tb[SWAP_DEVICE])
 304                 return -1;
 305
 306         m = malloc(sizeof(struct mount));
 307         memset(m, 0, sizeof(struct mount));
 308         m->type = TYPE_SWAP;
 309         m->uuid = blobmsg_get_strdup(tb[SWAP_UUID]);
 310         m->label = blobmsg_get_strdup(tb[SWAP_LABEL]);
 311         m->device = blobmsg_get_basename(tb[SWAP_DEVICE]);
 312         if (tb[SWAP_PRIO])
 313                 m->prio = blobmsg_get_u32(tb[SWAP_PRIO]);
 314         if (m->prio)
 315                 m->prio = ((m->prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
 316
 317         if ((!tb[SWAP_ENABLE]) || blobmsg_get_u32(tb[SWAP_ENABLE])) {
 318                 /* store complete swap path */
 319                 if (tb[SWAP_DEVICE])
 320                         m->target = blobmsg_get_strdup(tb[SWAP_DEVICE]);
 321
 322                 if (m->uuid)
 323                         vlist_add(&mounts, &m->node, m->uuid);
 324                 else if (m->label)
 325                         vlist_add(&mounts, &m->node, m->label);
 326                 else if (m->device)
 327                         vlist_add(&mounts, &m->node, m->device);
 328         }
 329
 330         return 0;
 331 }
 332
 333 static int global_add(struct uci_section *s)
 334 {
 335         struct blob_attr *tb[__CFG_MAX] = { 0 };
 336
 337         blob_buf_init(&b, 0);
 338         uci_to_blob(&b, s, &config_attr_list);
 339         blobmsg_parse(config_policy, __CFG_MAX, tb, blob_data(b.head), blob_len(b.head));
 340
 341         if ((tb[CFG_ANON_MOUNT]) && blobmsg_get_u32(tb[CFG_ANON_MOUNT]))
 342                 anon_mount = 1;
 343         if ((tb[CFG_ANON_SWAP]) && blobmsg_get_u32(tb[CFG_ANON_SWAP]))
 344                 anon_swap = 1;
 345
 346         if ((tb[CFG_AUTO_MOUNT]) && blobmsg_get_u32(tb[CFG_AUTO_MOUNT]))
 347                 auto_mount = 1;
 348         if ((tb[CFG_AUTO_SWAP]) && blobmsg_get_u32(tb[CFG_AUTO_SWAP]))
 349                 auto_swap = 1;
 350
 351         if (tb[CFG_DELAY_ROOT])
 352                 delay_root = blobmsg_get_u32(tb[CFG_DELAY_ROOT]);
 353
 354         if ((tb[CFG_CHECK_FS]) && blobmsg_get_u32(tb[CFG_CHECK_FS]))
 355                 check_fs = 1;
 356
 357         return 0;
 358 }
 359
 360 static struct mount* find_swap(const char *uuid, const char *label, const char *device)
 361 {
 362         struct mount *m;
 363
 364         vlist_for_each_element(&mounts, m, node) {
 365                 if (m->type != TYPE_SWAP)
 366                         continue;
 367                 if (uuid && m->uuid && !strcasecmp(m->uuid, uuid))
 368                         return m;
 369                 if (label && m->label && !strcmp(m->label, label))
 370                         return m;
 371                 if (device && m->device && !strcmp(m->device, device))
 372                         return m;
 373         }
 374
 375         return NULL;
 376 }
 377
 378 static struct mount* find_block(const char *uuid, const char *label, const char *device,
 379                                 const char *target)
 380 {
 381         struct mount *m;
 382
 383         vlist_for_each_element(&mounts, m, node) {
 384                 if (m->type != TYPE_MOUNT)
 385                         continue;
 386                 if (m->uuid && uuid && !strcasecmp(m->uuid, uuid))
 387                         return m;
 388                 if (m->label && label && !strcmp(m->label, label))
 389                         return m;
 390                 if (m->target && target && !strcmp(m->target, target))
 391                         return m;
 392                 if (m->device && device && !strcmp(m->device, device))
 393                         return m;
 394         }
 395
 396         return NULL;
 397 }
 398
 399 static void mounts_update(struct vlist_tree *tree, struct vlist_node *node_new,
 400                           struct vlist_node *node_old)
 401 {
 402 }
 403
 404 static struct uci_package * config_try_load(struct uci_context *ctx, char *path)
 405 {
 406         char *file = basename(path);
 407         char *dir = dirname(path);
 408         char *err;
 409         struct uci_package *pkg;
 410
 411         uci_set_confdir(ctx, dir);
 412         ULOG_INFO("attempting to load %s/%s\n", dir, file);
 413
 414         if (uci_load(ctx, file, &pkg)) {
 415                 uci_get_errorstr(ctx, &err, file);
 416                 ULOG_ERR("unable to load configuration (%s)\n", err);
 417
 418                 free(err);
 419                 return NULL;
 420         }
 421
 422         return pkg;
 423 }
 424
 425 static int config_load(char *cfg)
 426 {
 427         struct uci_context *ctx = uci_alloc_context();
 428         struct uci_package *pkg = NULL;
 429         struct uci_element *e;
 430         char path[64];
 431
 432         vlist_init(&mounts, avl_strcmp, mounts_update);
 433
 434         if (cfg) {
 435                 snprintf(path, sizeof(path), "%s/upper/etc/config/fstab", cfg);
 436                 pkg = config_try_load(ctx, path);
 437
 438                 if (!pkg) {
 439                         snprintf(path, sizeof(path), "%s/etc/config/fstab", cfg);
 440                         pkg = config_try_load(ctx, path);
 441                 }
 442         }
 443
 444         if (!pkg) {
 445                 snprintf(path, sizeof(path), "/etc/config/fstab");
 446                 pkg = config_try_load(ctx, path);
 447         }
 448
 449         if (!pkg) {
 450                 ULOG_ERR("no usable configuration\n");
 451                 return -1;
 452         }
 453
 454         vlist_update(&mounts);
 455         uci_foreach_element(&pkg->sections, e) {
 456                 struct uci_section *s = uci_to_section(e);
 457
 458                 if (!strcmp(s->type, "mount"))
 459                         mount_add(s);
 460                 if (!strcmp(s->type, "swap"))
 461                         swap_add(s);
 462                 if (!strcmp(s->type, "global"))
 463                         global_add(s);
 464         }
 465         vlist_flush(&mounts);
 466
 467         return 0;
 468 }
 469
 470 static struct blkid_struct_probe* _probe_path(char *path)
 471 {
 472         struct blkid_struct_probe *pr;
 473
 474         pr = malloc(sizeof(*pr));
 475
 476         if (!pr)
 477                 return NULL;
 478
 479         memset(pr, 0, sizeof(*pr));
 480         probe_block(path, pr);
 481
 482         if (pr->err || !pr->id) {
 483                 free(pr);
 484                 return NULL;
 485         }
 486
 487         return pr;
 488 }
 489
 490 static int _cache_load(const char *path)
 491 {
 492         int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
 493         int j;
 494         glob_t gl;
 495
 496         if (glob(path, gl_flags, NULL, &gl) < 0)
 497                 return -1;
 498
 499         for (j = 0; j < gl.gl_pathc; j++) {
 500                 struct blkid_struct_probe *pr = _probe_path(gl.gl_pathv[j]);
 501                 if (pr)
 502                         list_add_tail(&pr->list, &devices);
 503         }
 504
 505         globfree(&gl);
 506
 507         return 0;
 508 }
 509
 510 static void cache_load(int mtd)
 511 {
 512         if (mtd) {
 513                 _cache_load("/dev/mtdblock*");
 514                 _cache_load("/dev/ubiblock*");
 515                 _cache_load("/dev/ubi?*_?*");
 516         }
 517         _cache_load("/dev/mmcblk*");
 518         _cache_load("/dev/sd*");
 519         _cache_load("/dev/hd*");
 520         _cache_load("/dev/md*");
 521         _cache_load("/dev/vd*");
 522         _cache_load("/dev/mapper/*");
 523 }
 524
 525 static int print_block_info(struct blkid_struct_probe *pr)
 526 {
 527         printf("%s:", pr->dev);
 528         if (pr->uuid[0])
 529                 printf(" UUID=\"%s\"", pr->uuid);
 530
 531         if (pr->label[0])
 532                 printf(" LABEL=\"%s\"", pr->label);
 533
 534         if (pr->name[0])
 535                 printf(" NAME=\"%s\"", pr->name);
 536
 537         if (pr->version[0])
 538                 printf(" VERSION=\"%s\"", pr->version);
 539
 540         printf(" TYPE=\"%s\"\n", pr->id->name);
 541
 542         return 0;
 543 }
 544
 545 static int print_block_uci(struct blkid_struct_probe *pr)
 546 {
 547         if (!strcmp(pr->id->name, "swap")) {
 548                 printf("config 'swap'\n");
 549         } else {
 550                 printf("config 'mount'\n");
 551                 printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev));
 552         }
 553         if (pr->uuid[0])
 554                 printf("\toption\tuuid\t'%s'\n", pr->uuid);
 555         else
 556                 printf("\toption\tdevice\t'%s'\n", pr->dev);
 557         printf("\toption\tenabled\t'0'\n\n");
 558
 559         return 0;
 560 }
 561
 562 static struct blkid_struct_probe* find_block_info(char *uuid, char *label, char *path)
 563 {
 564         struct blkid_struct_probe *pr = NULL;
 565
 566         if (uuid)
 567                 list_for_each_entry(pr, &devices, list)
 568                         if (!strcasecmp(pr->uuid, uuid))
 569                                 return pr;
 570
 571         if (label)
 572                 list_for_each_entry(pr, &devices, list)
 573                         if (!strcmp(pr->label, label))
 574                                 return pr;
 575
 576         if (path)
 577                 list_for_each_entry(pr, &devices, list)
 578                         if (!strcmp(basename(pr->dev), basename(path)))
 579                                 return pr;
 580
 581         return NULL;
 582 }
 583
 584 static char* find_mount_point(char *block)
 585 {
 586         FILE *fp = fopen("/proc/mounts", "r");
 587         static char line[256];
 588         int len = strlen(block);
 589         char *point = NULL;
 590
 591         if(!fp)
 592                 return NULL;
 593
 594         while (fgets(line, sizeof(line), fp)) {
 595                 if (!strncmp(line, block, len)) {
 596                         char *p = &line[len + 1];
 597                         char *t = strstr(p, " ");
 598
 599                         if (!t) {
 600                                 fclose(fp);
 601                                 return NULL;
 602                         }
 603                         *t = '\0';
 604                         point = p;
 605                         break;
 606                 }
 607         }
 608
 609         fclose(fp);
 610
 611         return point;
 612 }
 613
 614 static void mkdir_p(char *dir)
 615 {
 616         char *l = strrchr(dir, '/');
 617
 618         if (l) {
 619                 *l = '\0';
 620                 mkdir_p(dir);
 621                 *l = '/';
 622                 mkdir(dir, 0755);
 623         }
 624 }
 625
 626 static void check_filesystem(struct blkid_struct_probe *pr)
 627 {
 628         pid_t pid;
 629         struct stat statbuf;
 630         char *e2fsck = "/usr/sbin/e2fsck";
 631
 632         /* UBIFS does not need stuff like fsck */
 633         if (!strncmp(pr->id->name, "ubifs", 5))
 634                 return;
 635
 636         if (strncmp(pr->id->name, "ext", 3)) {
 637                 ULOG_ERR("check_filesystem: %s is not supported\n", pr->id->name);
 638                 return;
 639         }
 640
 641         if (stat(e2fsck, &statbuf) < 0) {
 642                 ULOG_ERR("check_filesystem: %s not found\n", e2fsck);
 643                 return;
 644         }
 645
 646         pid = fork();
 647         if (!pid) {
 648                 execl(e2fsck, e2fsck, "-p", pr->dev, NULL);
 649                 exit(-1);
 650         } else if (pid > 0) {
 651                 int status;
 652
 653                 waitpid(pid, &status, 0);
 654                 if (WEXITSTATUS(status))
 655                         ULOG_ERR("check_filesystem: %s returned %d\n", e2fsck, WEXITSTATUS(status));
 656         }
 657 }
 658
 659 static void handle_swapfiles(bool on)
 660 {
 661         struct stat s;
 662         struct mount *m;
 663         struct blkid_struct_probe *pr;
 664
 665         vlist_for_each_element(&mounts, m, node)
 666         {
 667                 if (m->type != TYPE_SWAP || !m->target)
 668                         continue;
 669
 670                 if (stat(m->target, &s) || !S_ISREG(s.st_mode))
 671                         continue;
 672
 673                 pr = _probe_path(m->target);
 674
 675                 if (!pr)
 676                         continue;
 677
 678                 if (!strcmp(pr->id->name, "swap")) {
 679                         if (on)
 680                                 swapon(pr->dev, m->prio);
 681                         else
 682                                 swapoff(pr->dev);
 683                 }
 684
 685                 free(pr);
 686         }
 687 }
 688
 689 static int mount_device(struct blkid_struct_probe *pr, int hotplug)
 690 {
 691         struct mount *m;
 692         char *device;
 693
 694         if (!pr)
 695                 return -1;
 696
 697         device = basename(pr->dev);
 698
 699         if (!strcmp(pr->id->name, "swap")) {
 700                 if (hotplug && !auto_swap)
 701                         return -1;
 702                 m = find_swap(pr->uuid, pr->label, device);
 703                 if (m || anon_swap)
 704                         swapon(pr->dev, (m) ? (m->prio) : (0));
 705
 706                 return 0;
 707         }
 708
 709         if (hotplug && !auto_mount)
 710                 return -1;
 711
 712         if (find_mount_point(pr->dev)) {
 713                 ULOG_ERR("%s is already mounted\n", pr->dev);
 714                 return -1;
 715         }
 716
 717         m = find_block(pr->uuid, pr->label, device, NULL);
 718         if (m && m->extroot)
 719                 return -1;
 720
 721         if (m) {
 722                 char *target = m->target;
 723                 char _target[32];
 724                 int err = 0;
 725
 726                 if (!target) {
 727                         snprintf(_target, sizeof(_target), "/mnt/%s", device);
 728                         target = _target;
 729                 }
 730                 mkdir_p(target);
 731
 732                 if (check_fs)
 733                         check_filesystem(pr);
 734
 735                 err = mount(pr->dev, target, pr->id->name, m->flags,
 736                             (m->options) ? (m->options) : (""));
 737                 if (err)
 738                         ULOG_ERR("mounting %s (%s) as %s failed (%d) - %s\n",
 739                                  pr->dev, pr->id->name, target, err, strerror(err));
 740                 else
 741                         handle_swapfiles(true);
 742                 return err;
 743         }
 744
 745         if (anon_mount) {
 746                 char target[] = "/mnt/mmcblk123";
 747                 int err = 0;
 748
 749                 snprintf(target, sizeof(target), "/mnt/%s", device);
 750                 mkdir_p(target);
 751
 752                 if (check_fs)
 753                         check_filesystem(pr);
 754
 755                 err = mount(pr->dev, target, pr->id->name, 0, "");
 756                 if (err)
 757                         ULOG_ERR("mounting %s (%s) as %s failed (%d) - %s\n",
 758                                  pr->dev, pr->id->name, target, err, strerror(err));
 759                 else
 760                         handle_swapfiles(true);
 761                 return err;
 762         }
 763
 764         return 0;
 765 }
 766
 767 static int umount_device(struct blkid_struct_probe *pr)
 768 {
 769         struct mount *m;
 770         char *device = basename(pr->dev);
 771         char *mp;
 772         int err;
 773
 774         if (!pr)
 775                 return -1;
 776
 777         if (!strcmp(pr->id->name, "swap"))
 778                 return -1;
 779
 780         mp = find_mount_point(pr->dev);
 781         if (!mp)
 782                 return -1;
 783
 784         m = find_block(pr->uuid, pr->label, device, NULL);
 785         if (m && m->extroot)
 786                 return -1;
 787
 788         err = umount2(mp, MNT_DETACH);
 789         if (err)
 790                 ULOG_ERR("unmounting %s (%s)  failed (%d) - %s\n",
 791                          pr->dev, mp, err, strerror(err));
 792         else
 793                 ULOG_INFO("unmounted %s (%s)\n",
 794                           pr->dev, mp);
 795
 796         return err;
 797 }
 798
 799 static int main_hotplug(int argc, char **argv)
 800 {
 801         char path[32];
 802         char *action, *device, *mount_point;
 803
 804         action = getenv("ACTION");
 805         device = getenv("DEVNAME");
 806
 807         if (!action || !device)
 808                 return -1;
 809         snprintf(path, sizeof(path), "/dev/%s", device);
 810
 811         if (!strcmp(action, "remove")) {
 812                 int err = 0;
 813                 mount_point = find_mount_point(path);
 814                 if (mount_point)
 815                         err = umount2(mount_point, MNT_DETACH);
 816
 817                 if (err)
 818                         ULOG_ERR("umount of %s failed (%d) - %s\n",
 819                                  mount_point, err, strerror(err));
 820
 821                 return 0;
 822         } else if (strcmp(action, "add")) {
 823                 ULOG_ERR("Unkown action %s\n", action);
 824
 825                 return -1;
 826         }
 827
 828         if (config_load(NULL))
 829                 return -1;
 830         cache_load(0);
 831
 832         return mount_device(find_block_info(NULL, NULL, path), 1);
 833 }
 834
 835 static int find_block_mtd(char *name, char *part, int plen)
 836 {
 837         FILE *fp = fopen("/proc/mtd", "r");
 838         static char line[256];
 839         char *index = NULL;
 840
 841         if(!fp)
 842                 return -1;
 843
 844         while (!index && fgets(line, sizeof(line), fp)) {
 845                 if (strstr(line, name)) {
 846                         char *eol = strstr(line, ":");
 847
 848                         if (!eol)
 849                                 continue;
 850
 851                         *eol = '\0';
 852                         index = &line[3];
 853                 }
 854         }
 855
 856         fclose(fp);
 857
 858         if (!index)
 859                 return -1;
 860
 861         snprintf(part, plen, "/dev/mtdblock%s", index);
 862
 863         return 0;
 864 }
 865
 866 #ifdef UBIFS_EXTROOT
 867 static int find_ubi_vol(libubi_t libubi, char *name, int *dev_num, int *vol_id)
 868 {
 869         int dev = 0;
 870
 871         while (ubi_dev_present(libubi, dev))
 872         {
 873                 struct ubi_dev_info dev_info;
 874                 struct ubi_vol_info vol_info;
 875
 876                 if (ubi_get_dev_info1(libubi, dev++, &dev_info))
 877                         continue;
 878                 if (ubi_get_vol_info1_nm(libubi, dev_info.dev_num, name, &vol_info))
 879                         continue;
 880
 881                 *dev_num = dev_info.dev_num;
 882                 *vol_id = vol_info.vol_id;
 883
 884                 return 0;
 885         }
 886
 887         return -1;
 888 }
 889
 890 static int find_block_ubi(libubi_t libubi, char *name, char *part, int plen)
 891 {
 892         int dev_num;
 893         int vol_id;
 894         int err = -1;
 895
 896         err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
 897         if (!err)
 898                 snprintf(part, plen, "/dev/ubi%d_%d", dev_num, vol_id);
 899
 900         return err;
 901 }
 902
 903 static int find_block_ubi_RO(libubi_t libubi, char *name, char *part, int plen)
 904 {
 905         int dev_num;
 906         int vol_id;
 907         int err = -1;
 908
 909         err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
 910         if (!err)
 911                 snprintf(part, plen, "/dev/ubiblock%d_%d", dev_num, vol_id);
 912
 913         return err;
 914 }
 915
 916 #else
 917
 918 static int find_root_dev(char *buf, int len)
 919 {
 920         DIR *d;
 921         dev_t root;
 922         struct stat s;
 923         struct dirent *e;
 924
 925         if (stat("/", &s))
 926                 return -1;
 927
 928         if (!(d = opendir("/dev")))
 929                 return -1;
 930
 931         root = s.st_dev;
 932
 933         while ((e = readdir(d)) != NULL) {
 934                 snprintf(buf, len, "/dev/%s", e->d_name);
 935
 936                 if (stat(buf, &s) || s.st_rdev != root)
 937                         continue;
 938
 939                 closedir(d);
 940                 return 0;
 941         }
 942
 943         closedir(d);
 944         return -1;
 945 }
 946
 947 #endif
 948
 949 static int test_fs_support(const char *name)
 950 {
 951         char line[128], *p;
 952         int rv = -1;
 953         FILE *f;
 954
 955         if ((f = fopen("/proc/filesystems", "r")) != NULL) {
 956                 while (fgets(line, sizeof(line), f)) {
 957                         p = strtok(line, "\t\n");
 958
 959                         if (p && !strcmp(p, "nodev"))
 960                                 p = strtok(NULL, "\t\n");
 961
 962                         if (p && !strcmp(p, name)) {
 963                                 rv = 0;
 964                                 break;
 965                         }
 966                 }
 967                 fclose(f);
 968         }
 969
 970         return rv;
 971 }
 972
 973 static int check_extroot(char *path)
 974 {
 975         struct blkid_struct_probe *pr = NULL;
 976         char devpath[32];
 977
 978 #ifdef UBIFS_EXTROOT
 979         if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) {
 980                 int err = -1;
 981                 libubi_t libubi;
 982
 983                 libubi = libubi_open();
 984                 err = find_block_ubi_RO(libubi, "rootfs", devpath, sizeof(devpath));
 985                 libubi_close(libubi);
 986                 if (err)
 987                         return -1;
 988         }
 989 #else
 990         if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) {
 991                 if (find_root_dev(devpath, sizeof(devpath))) {
 992                         ULOG_ERR("extroot: unable to determine root device\n");
 993                         return -1;
 994                 }
 995         }
 996 #endif
 997
 998         list_for_each_entry(pr, &devices, list) {
 999                 if (!strcmp(pr->dev, devpath)) {
1000                         struct stat s;
1001                         FILE *fp = NULL;
1002                         char tag[64];
1003                         char uuid[64] = { 0 };
1004
1005                         snprintf(tag, sizeof(tag), "%s/etc", path);
1006                         if (stat(tag, &s))
1007                                 mkdir_p(tag);
1008
1009                         snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
1010                         if (stat(tag, &s)) {
1011                                 fp = fopen(tag, "w+");
1012                                 if (!fp) {
1013                                         ULOG_ERR("extroot: failed to write UUID to %s: %d (%s)\n",
1014                                                  tag, errno, strerror(errno));
1015                                         /* return 0 to continue boot regardless of error */
1016                                         return 0;
1017                                 }
1018                                 fputs(pr->uuid, fp);
1019                                 fclose(fp);
1020                                 return 0;
1021                         }
1022
1023                         fp = fopen(tag, "r");
1024                         if (!fp) {
1025                                 ULOG_ERR("extroot: failed to read UUID from %s: %d (%s)\n",
1026                                          tag, errno, strerror(errno));
1027                                 return -1;
1028                         }
1029
1030                         if (!fgets(uuid, sizeof(uuid), fp))
1031                                 ULOG_ERR("extroot: failed to read UUID from %s: %d (%s)\n",
1032                                          tag, errno, strerror(errno));
1033                         fclose(fp);
1034
1035                         if (*uuid || !strcasecmp(uuid, pr->uuid))
1036                                 return 0;
1037
1038                         ULOG_ERR("extroot: UUID mismatch (root: %s, %s: %s)\n",
1039                                  pr->uuid, basename(path), uuid);
1040                         return -1;
1041                 }
1042         }
1043
1044         ULOG_ERR("extroot: unable to lookup root device %s\n", devpath);
1045         return -1;
1046 }
1047
1048 /*
1049  * Read info about extroot from UCI (using prefix) and mount it.
1050  */
1051 static int mount_extroot(char *cfg)
1052 {
1053         char overlay[] = "/tmp/extroot/overlay";
1054         char mnt[] = "/tmp/extroot/mnt";
1055         char *path = mnt;
1056         struct blkid_struct_probe *pr;
1057         struct mount *m;
1058         int err = -1;
1059
1060         /* Load @cfg/etc/config/fstab */
1061         if (config_load(cfg))
1062                 return -2;
1063
1064         /* See if there is extroot-specific mount config */
1065         m = find_block(NULL, NULL, NULL, "/");
1066         if (!m)
1067                 m = find_block(NULL, NULL, NULL, "/overlay");
1068
1069         if (!m || !m->extroot)
1070         {
1071                 ULOG_INFO("extroot: not configured\n");
1072                 return -1;
1073         }
1074
1075         /* Find block device pointed by the mount config */
1076         pr = find_block_info(m->uuid, m->label, m->device);
1077
1078         if (!pr && delay_root){
1079                 ULOG_INFO("extroot: device not present, retrying in %u seconds\n", delay_root);
1080                 sleep(delay_root);
1081                 mkblkdev();
1082                 cache_load(0);
1083                 pr = find_block_info(m->uuid, m->label, m->device);
1084         }
1085         if (pr) {
1086                 if (strncmp(pr->id->name, "ext", 3) &&
1087                     strncmp(pr->id->name, "ubifs", 5)) {
1088                         ULOG_ERR("extroot: unsupported filesystem %s, try ext4\n", pr->id->name);
1089                         return -1;
1090                 }
1091
1092                 if (test_fs_support(pr->id->name)) {
1093                         ULOG_ERR("extroot: filesystem %s not supported by kernel\n", pr->id->name);
1094                         return -1;
1095                 }
1096
1097                 if (m->overlay)
1098                         path = overlay;
1099                 mkdir_p(path);
1100
1101                 if (check_fs)
1102                         check_filesystem(pr);
1103
1104                 err = mount(pr->dev, path, pr->id->name, 0, (m->options) ? (m->options) : (""));
1105
1106                 if (err) {
1107                         ULOG_ERR("extroot: mounting %s (%s) on %s failed: %d (%s)\n",
1108                                  pr->dev, pr->id->name, path, err, strerror(err));
1109                 } else if (m->overlay) {
1110                         err = check_extroot(path);
1111                         if (err)
1112                                 umount(path);
1113                 }
1114         } else {
1115                 ULOG_ERR("extroot: cannot find device %s%s\n",
1116                          (m->uuid ? "with UUID " : (m->label ? "with label " : "")),
1117                          (m->uuid ? m->uuid : (m->label ? m->label : m->device)));
1118         }
1119
1120         return err;
1121 }
1122
1123 static int main_extroot(int argc, char **argv)
1124 {
1125         struct blkid_struct_probe *pr;
1126         char blkdev_path[32] = { 0 };
1127         int err = -1;
1128 #ifdef UBIFS_EXTROOT
1129         libubi_t libubi;
1130 #endif
1131
1132         if (!getenv("PREINIT"))
1133                 return -1;
1134
1135         if (argc != 2) {
1136                 ULOG_ERR("Usage: block extroot\n");
1137                 return -1;
1138         }
1139
1140         mkblkdev();
1141         cache_load(1);
1142
1143         /* enable LOG_INFO messages */
1144         ulog_threshold(LOG_INFO);
1145
1146         /*
1147          * Look for "rootfs_data". We will want to mount it and check for
1148          * extroot configuration.
1149          */
1150
1151         /* Start with looking for MTD partition */
1152         find_block_mtd("\"rootfs_data\"", blkdev_path, sizeof(blkdev_path));
1153         if (blkdev_path[0]) {
1154                 pr = find_block_info(NULL, NULL, blkdev_path);
1155                 if (pr && !strcmp(pr->id->name, "jffs2")) {
1156                         char cfg[] = "/tmp/jffs_cfg";
1157
1158                         /*
1159                          * Mount MTD part and try extroot (using
1160                          * /etc/config/fstab from that partition)
1161                          */
1162                         mkdir_p(cfg);
1163                         if (!mount(blkdev_path, cfg, "jffs2", MS_NOATIME, NULL)) {
1164                                 err = mount_extroot(cfg);
1165                                 umount2(cfg, MNT_DETACH);
1166                         }
1167                         if (err < 0)
1168                                 rmdir("/tmp/overlay");
1169                         rmdir(cfg);
1170                         return err;
1171                 }
1172         }
1173
1174 #ifdef UBIFS_EXTROOT
1175         /* ... but it also could be an UBI volume */
1176         memset(blkdev_path, 0, sizeof(blkdev_path));
1177         libubi = libubi_open();
1178         find_block_ubi(libubi, "rootfs_data", blkdev_path, sizeof(blkdev_path));
1179         libubi_close(libubi);
1180         if (blkdev_path[0]) {
1181                 char cfg[] = "/tmp/ubifs_cfg";
1182
1183                 /* Mount volume and try extroot (using fstab from that vol) */
1184                 mkdir_p(cfg);
1185                 if (!mount(blkdev_path, cfg, "ubifs", MS_NOATIME, NULL)) {
1186                         err = mount_extroot(cfg);
1187                         umount2(cfg, MNT_DETACH);
1188                 }
1189                 if (err < 0)
1190                         rmdir("/tmp/overlay");
1191                 rmdir(cfg);
1192                 return err;
1193        }
1194 #endif
1195
1196         return mount_extroot(NULL);
1197 }
1198
1199 static int main_mount(int argc, char **argv)
1200 {
1201         struct blkid_struct_probe *pr;
1202
1203         if (config_load(NULL))
1204                 return -1;
1205
1206         cache_load(1);
1207         list_for_each_entry(pr, &devices, list)
1208                 mount_device(pr, 0);
1209
1210         handle_swapfiles(true);
1211
1212         return 0;
1213 }
1214
1215 static int main_umount(int argc, char **argv)
1216 {
1217         struct blkid_struct_probe *pr;
1218
1219         if (config_load(NULL))
1220                 return -1;
1221
1222         handle_swapfiles(false);
1223
1224         cache_load(0);
1225         list_for_each_entry(pr, &devices, list)
1226                 umount_device(pr);
1227
1228         return 0;
1229 }
1230
1231 static int main_detect(int argc, char **argv)
1232 {
1233         struct blkid_struct_probe *pr;
1234
1235         cache_load(0);
1236         printf("config 'global'\n");
1237         printf("\toption\tanon_swap\t'0'\n");
1238         printf("\toption\tanon_mount\t'0'\n");
1239         printf("\toption\tauto_swap\t'1'\n");
1240         printf("\toption\tauto_mount\t'1'\n");
1241         printf("\toption\tdelay_root\t'5'\n");
1242         printf("\toption\tcheck_fs\t'0'\n\n");
1243         list_for_each_entry(pr, &devices, list)
1244                 print_block_uci(pr);
1245
1246         return 0;
1247 }
1248
1249 static int main_info(int argc, char **argv)
1250 {
1251         int i;
1252         struct blkid_struct_probe *pr;
1253
1254         cache_load(1);
1255         if (argc == 2) {
1256                 list_for_each_entry(pr, &devices, list)
1257                         print_block_info(pr);
1258
1259                 return 0;
1260         };
1261
1262         for (i = 2; i < argc; i++) {
1263                 struct stat s;
1264
1265                 if (stat(argv[i], &s)) {
1266                         ULOG_ERR("failed to stat %s\n", argv[i]);
1267                         continue;
1268                 }
1269                 if (!S_ISBLK(s.st_mode)) {
1270                         ULOG_ERR("%s is not a block device\n", argv[i]);
1271                         continue;
1272                 }
1273                 pr = find_block_info(NULL, NULL, argv[i]);
1274                 if (pr)
1275                         print_block_info(pr);
1276         }
1277
1278         return 0;
1279 }
1280
1281 static int swapon_usage(void)
1282 {
1283         fprintf(stderr, "Usage: swapon [-s] [-a] [[-p pri] DEVICE]\n\n"
1284                 "\tStart swapping on [DEVICE]\n"
1285                 " -a\tStart swapping on all swap devices\n"
1286                 " -p pri\tSet priority of swap device\n"
1287                 " -s\tShow summary\n");
1288         return -1;
1289 }
1290
1291 static int main_swapon(int argc, char **argv)
1292 {
1293         int ch;
1294         FILE *fp;
1295         char *lineptr;
1296         size_t s;
1297         struct blkid_struct_probe *pr;
1298         int flags = 0;
1299         int pri;
1300         struct stat st;
1301         int err;
1302
1303         while ((ch = getopt(argc, argv, "ap:s")) != -1) {
1304                 switch(ch) {
1305                 case 's':
1306                         fp = fopen("/proc/swaps", "r");
1307                         lineptr = NULL;
1308
1309                         if (!fp) {
1310                                 ULOG_ERR("failed to open /proc/swaps\n");
1311                                 return -1;
1312                         }
1313                         while (getline(&lineptr, &s, fp) > 0)
1314                                 printf("%s", lineptr);
1315                         if (lineptr)
1316                                 free(lineptr);
1317                         fclose(fp);
1318                         return 0;
1319                 case 'a':
1320                         cache_load(0);
1321                         list_for_each_entry(pr, &devices, list) {
1322                                 if (strcmp(pr->id->name, "swap"))
1323                                         continue;
1324                                 if (swapon(pr->dev, 0))
1325                                         ULOG_ERR("failed to swapon %s\n", pr->dev);
1326                         }
1327                         return 0;
1328                 case 'p':
1329                         pri = atoi(optarg);
1330                         if (pri >= 0)
1331                                 flags = ((pri << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
1332                         break;
1333                 default:
1334                         return swapon_usage();
1335                 }
1336
1337         }
1338
1339         if (optind != (argc - 1))
1340                 return swapon_usage();
1341
1342         if (stat(argv[optind], &st) || (!S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))) {
1343                 ULOG_ERR("%s is not a block device or file\n", argv[optind]);
1344                 return -1;
1345         }
1346         err = swapon(argv[optind], flags);
1347         if (err) {
1348                 ULOG_ERR("failed to swapon %s (%d)\n", argv[optind], err);
1349                 return err;
1350         }
1351
1352         return 0;
1353 }
1354
1355 static int main_swapoff(int argc, char **argv)
1356 {
1357         if (argc != 2) {
1358                 ULOG_ERR("Usage: swapoff [-a] [DEVICE]\n\n"
1359                         "\tStop swapping on DEVICE\n"
1360                         " -a\tStop swapping on all swap devices\n");
1361                 return -1;
1362         }
1363
1364         if (!strcmp(argv[1], "-a")) {
1365                 FILE *fp = fopen("/proc/swaps", "r");
1366                 char line[256];
1367
1368                 if (!fp) {
1369                         ULOG_ERR("failed to open /proc/swaps\n");
1370                         return -1;
1371                 }
1372                 if (fgets(line, sizeof(line), fp))
1373                         while (fgets(line, sizeof(line), fp)) {
1374                                 char *end = strchr(line, ' ');
1375                                 int err;
1376
1377                                 if (!end)
1378                                         continue;
1379                                 *end = '\0';
1380                                 err = swapoff(line);
1381                                 if (err)
1382                                         ULOG_ERR("failed to swapoff %s (%d)\n", line, err);
1383                         }
1384                 fclose(fp);
1385         } else {
1386                 struct stat s;
1387                 int err;
1388
1389                 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1390                         ULOG_ERR("%s is not a block device or file\n", argv[1]);
1391                         return -1;
1392                 }
1393                 err = swapoff(argv[1]);
1394                 if (err) {
1395                         ULOG_ERR("failed to swapoff %s (%d)\n", argv[1], err);
1396                         return err;
1397                 }
1398         }
1399
1400         return 0;
1401 }
1402
1403 int main(int argc, char **argv)
1404 {
1405         char *base = basename(*argv);
1406
1407         umask(0);
1408
1409         ulog_open(-1, -1, "block");
1410         ulog_threshold(LOG_NOTICE);
1411
1412         if (!strcmp(base, "swapon"))
1413                 return main_swapon(argc, argv);
1414
1415         if (!strcmp(base, "swapoff"))
1416                 return main_swapoff(argc, argv);
1417
1418         if ((argc > 1) && !strcmp(base, "block")) {
1419                 if (!strcmp(argv[1], "info"))
1420                         return main_info(argc, argv);
1421
1422                 if (!strcmp(argv[1], "detect"))
1423                         return main_detect(argc, argv);
1424
1425                 if (!strcmp(argv[1], "hotplug"))
1426                         return main_hotplug(argc, argv);
1427
1428                 if (!strcmp(argv[1], "extroot"))
1429                         return main_extroot(argc, argv);
1430
1431                 if (!strcmp(argv[1], "mount"))
1432                         return main_mount(argc, argv);
1433
1434                 if (!strcmp(argv[1], "umount"))
1435                         return main_umount(argc, argv);
1436         }
1437
1438         ULOG_ERR("Usage: block <info|mount|umount|detect>\n");
1439
1440         return -1;
1441 }