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