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