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/list.h>
  36 #include <libubox/vlist.h>
  37 #include <libubox/blobmsg_json.h>
  38 #include <libubox/avl-cmp.h>
  39
  40 #include "libblkid-tiny/libblkid-tiny.h"
  41
  42 #ifdef UBIFS_EXTROOT
  43 #include "libubi/libubi.h"
  44 #endif
  45
  46 static int kmsg = 0;
  47
  48 static void klog(int prio, const char *fmt, ...)
  49 {
  50         va_list ap;
  51         FILE *f = fopen("/dev/kmsg", "w");
  52
  53         if (f) {
  54                 fprintf(f, "<%d>", prio);
  55
  56                 va_start(ap, fmt);
  57                 vfprintf(f, fmt, ap);
  58                 va_end(ap);
  59
  60                 fclose(f);
  61         }
  62 }
  63
  64 #define KINFO(fmt, ...) do { \
  65                 if (kmsg) klog(LOG_INFO, "block: " fmt, ## __VA_ARGS__); \
  66         } while (0)
  67
  68 #define ERROR(fmt, ...) do { \
  69                 if (kmsg) \
  70                         klog(LOG_ERR, "block: " fmt, ## __VA_ARGS__); \
  71                 else { \
  72                         syslog(LOG_ERR, fmt, ## __VA_ARGS__); \
  73                         fprintf(stderr, "block: "fmt, ## __VA_ARGS__); \
  74                 } \
  75         } while (0)
  76
  77 enum {
  78         TYPE_MOUNT,
  79         TYPE_SWAP,
  80 };
  81
  82 struct mount {
  83         struct vlist_node node;
  84         int type;
  85
  86         char *target;
  87         char *path;
  88         char *options;
  89         uint32_t flags;
  90         char *uuid;
  91         char *label;
  92         char *device;
  93         int extroot;
  94         int overlay;
  95         int disabled_fsck;
  96         unsigned int prio;
  97 };
  98
  99 static struct vlist_tree mounts;
 100 static struct blob_buf b;
 101 static LIST_HEAD(devices);
 102 static int anon_mount, anon_swap, auto_mount, auto_swap, check_fs;
 103 static unsigned int delay_root;
 104
 105 enum {
 106         CFG_ANON_MOUNT,
 107         CFG_ANON_SWAP,
 108         CFG_AUTO_MOUNT,
 109         CFG_AUTO_SWAP,
 110         CFG_DELAY_ROOT,
 111         CFG_CHECK_FS,
 112         __CFG_MAX
 113 };
 114
 115 static const struct blobmsg_policy config_policy[__CFG_MAX] = {
 116         [CFG_ANON_SWAP] = { .name = "anon_swap", .type = BLOBMSG_TYPE_INT32 },
 117         [CFG_ANON_MOUNT] = { .name = "anon_mount", .type = BLOBMSG_TYPE_INT32 },
 118         [CFG_AUTO_SWAP] = { .name = "auto_swap", .type = BLOBMSG_TYPE_INT32 },
 119         [CFG_AUTO_MOUNT] = { .name = "auto_mount", .type = BLOBMSG_TYPE_INT32 },
 120         [CFG_DELAY_ROOT] = { .name = "delay_root", .type = BLOBMSG_TYPE_INT32 },
 121         [CFG_CHECK_FS] = { .name = "check_fs", .type = BLOBMSG_TYPE_INT32 },
 122 };
 123
 124 enum {
 125         MOUNT_UUID,
 126         MOUNT_LABEL,
 127         MOUNT_ENABLE,
 128         MOUNT_TARGET,
 129         MOUNT_DEVICE,
 130         MOUNT_OPTIONS,
 131         __MOUNT_MAX
 132 };
 133
 134 static const struct uci_blob_param_list config_attr_list = {
 135         .n_params = __CFG_MAX,
 136         .params = config_policy,
 137 };
 138
 139 static const struct blobmsg_policy mount_policy[__MOUNT_MAX] = {
 140         [MOUNT_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
 141         [MOUNT_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
 142         [MOUNT_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
 143         [MOUNT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
 144         [MOUNT_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_STRING },
 145         [MOUNT_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
 146 };
 147
 148 static const struct uci_blob_param_list mount_attr_list = {
 149         .n_params = __MOUNT_MAX,
 150         .params = mount_policy,
 151 };
 152
 153 enum {
 154         SWAP_ENABLE,
 155         SWAP_UUID,
 156         SWAP_LABEL,
 157         SWAP_DEVICE,
 158         SWAP_PRIO,
 159         __SWAP_MAX
 160 };
 161
 162 static const struct blobmsg_policy swap_policy[__SWAP_MAX] = {
 163         [SWAP_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
 164         [SWAP_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
 165         [SWAP_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
 166         [SWAP_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
 167         [SWAP_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 },
 168 };
 169
 170 static const struct uci_blob_param_list swap_attr_list = {
 171         .n_params = __SWAP_MAX,
 172         .params = swap_policy,
 173 };
 174
 175 struct mount_flag {
 176         const char *name;
 177         int32_t flag;
 178 };
 179
 180 #ifndef MS_DIRSYNC
 181 #       define MS_DIRSYNC               (1 << 7)
 182 #endif
 183
 184 #ifndef MS_RELATIME
 185 #       define MS_RELATIME              (1 << 21)
 186 #endif
 187
 188 #ifndef MS_STRICTATIME
 189 #       define MS_STRICTATIME   (1 << 24)
 190 #endif
 191
 192 static const struct mount_flag mount_flags[] = {
 193         { "sync",               MS_SYNCHRONOUS  },
 194         { "async",              ~MS_SYNCHRONOUS },
 195         { "dirsync",            MS_DIRSYNC      },
 196         { "mand",               MS_MANDLOCK     },
 197         { "nomand",             ~MS_MANDLOCK    },
 198         { "atime",              ~MS_NOATIME     },
 199         { "noatime",            MS_NOATIME      },
 200         { "dev",                ~MS_NODEV       },
 201         { "nodev",              MS_NODEV        },
 202         { "diratime",           ~MS_NODIRATIME  },
 203         { "nodiratime",         MS_NODIRATIME   },
 204         { "exec",               ~MS_NOEXEC      },
 205         { "noexec",             MS_NOEXEC       },
 206         { "suid",               ~MS_NOSUID      },
 207         { "nosuid",             MS_NOSUID       },
 208         { "rw",                 ~MS_RDONLY      },
 209         { "ro",                 MS_RDONLY       },
 210         { "relatime",           MS_RELATIME     },
 211         { "norelatime",         ~MS_RELATIME    },
 212         { "strictatime",        MS_STRICTATIME  },
 213 };
 214
 215 static char *blobmsg_get_strdup(struct blob_attr *attr)
 216 {
 217         if (!attr)
 218                 return NULL;
 219
 220         return strdup(blobmsg_get_string(attr));
 221 }
 222
 223 static char *blobmsg_get_basename(struct blob_attr *attr)
 224 {
 225         if (!attr)
 226                 return NULL;
 227
 228         return strdup(basename(blobmsg_get_string(attr)));
 229 }
 230
 231 static void parse_mount_options(struct mount *m, char *optstr)
 232 {
 233         int i;
 234         bool is_flag;
 235         char *p, *opts, *last;
 236
 237         m->flags = 0;
 238         m->options = NULL;
 239
 240         if (!optstr || !*optstr)
 241                 return;
 242
 243         m->options = opts = calloc(1, strlen(optstr) + 1);
 244
 245         if (!m->options)
 246                 return;
 247
 248         p = last = optstr;
 249
 250         do {
 251                 p = strchr(p, ',');
 252
 253                 if (p)
 254                         *p++ = 0;
 255
 256                 for (i = 0, is_flag = false; i < ARRAY_SIZE(mount_flags); i++) {
 257                         if (!strcmp(last, mount_flags[i].name)) {
 258                                 if (mount_flags[i].flag < 0)
 259                                         m->flags &= (uint32_t)mount_flags[i].flag;
 260                                 else
 261                                         m->flags |= (uint32_t)mount_flags[i].flag;
 262                                 is_flag = true;
 263                                 break;
 264                         }
 265                 }
 266
 267                 if (!is_flag)
 268                         opts += sprintf(opts, "%s%s", (opts > m->options) ? "," : "", last);
 269
 270                 last = p;
 271
 272         } while (p);
 273
 274         free(optstr);
 275 }
 276
 277 static int mount_add(struct uci_section *s)
 278 {
 279         struct blob_attr *tb[__MOUNT_MAX] = { 0 };
 280         struct mount *m;
 281
 282         blob_buf_init(&b, 0);
 283         uci_to_blob(&b, s, &mount_attr_list);
 284         blobmsg_parse(mount_policy, __MOUNT_MAX, tb, blob_data(b.head), blob_len(b.head));
 285
 286         if (!tb[MOUNT_LABEL] && !tb[MOUNT_UUID] && !tb[MOUNT_DEVICE])
 287                 return -1;
 288
 289         if (tb[MOUNT_ENABLE] && !blobmsg_get_u32(tb[MOUNT_ENABLE]))
 290                 return -1;
 291
 292         m = malloc(sizeof(struct mount));
 293         m->type = TYPE_MOUNT;
 294         m->uuid = blobmsg_get_strdup(tb[MOUNT_UUID]);
 295         m->label = blobmsg_get_strdup(tb[MOUNT_LABEL]);
 296         m->target = blobmsg_get_strdup(tb[MOUNT_TARGET]);
 297         m->device = blobmsg_get_basename(tb[MOUNT_DEVICE]);
 298
 299         parse_mount_options(m, blobmsg_get_strdup(tb[MOUNT_OPTIONS]));
 300
 301         m->overlay = m->extroot = 0;
 302         if (m->target && !strcmp(m->target, "/"))
 303                 m->extroot = 1;
 304         if (m->target && !strcmp(m->target, "/overlay"))
 305                 m->extroot = m->overlay = 1;
 306
 307         if (m->uuid)
 308                 vlist_add(&mounts, &m->node, m->uuid);
 309         else if (m->label)
 310                 vlist_add(&mounts, &m->node, m->label);
 311         else if (m->device)
 312                 vlist_add(&mounts, &m->node, m->device);
 313
 314         return 0;
 315 }
 316
 317 static int swap_add(struct uci_section *s)
 318 {
 319         struct blob_attr *tb[__SWAP_MAX] = { 0 };
 320         struct mount *m;
 321
 322         blob_buf_init(&b, 0);
 323         uci_to_blob(&b, s, &swap_attr_list);
 324         blobmsg_parse(swap_policy, __SWAP_MAX, tb, blob_data(b.head), blob_len(b.head));
 325
 326         if (!tb[SWAP_UUID] && !tb[SWAP_LABEL] && !tb[SWAP_DEVICE])
 327                 return -1;
 328
 329         m = malloc(sizeof(struct mount));
 330         memset(m, 0, sizeof(struct mount));
 331         m->type = TYPE_SWAP;
 332         m->uuid = blobmsg_get_strdup(tb[SWAP_UUID]);
 333         m->label = blobmsg_get_strdup(tb[SWAP_LABEL]);
 334         m->device = blobmsg_get_basename(tb[SWAP_DEVICE]);
 335         if (tb[SWAP_PRIO])
 336                 m->prio = blobmsg_get_u32(tb[SWAP_PRIO]);
 337         if (m->prio)
 338                 m->prio = ((m->prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
 339
 340         if ((!tb[SWAP_ENABLE]) || blobmsg_get_u32(tb[SWAP_ENABLE])) {
 341                 /* store complete swap path */
 342                 if (tb[SWAP_DEVICE])
 343                         m->target = blobmsg_get_strdup(tb[SWAP_DEVICE]);
 344
 345                 if (m->uuid)
 346                         vlist_add(&mounts, &m->node, m->uuid);
 347                 else if (m->label)
 348                         vlist_add(&mounts, &m->node, m->label);
 349                 else if (m->device)
 350                         vlist_add(&mounts, &m->node, m->device);
 351         }
 352
 353         return 0;
 354 }
 355
 356 static int global_add(struct uci_section *s)
 357 {
 358         struct blob_attr *tb[__CFG_MAX] = { 0 };
 359
 360         blob_buf_init(&b, 0);
 361         uci_to_blob(&b, s, &config_attr_list);
 362         blobmsg_parse(config_policy, __CFG_MAX, tb, blob_data(b.head), blob_len(b.head));
 363
 364         if ((tb[CFG_ANON_MOUNT]) && blobmsg_get_u32(tb[CFG_ANON_MOUNT]))
 365                 anon_mount = 1;
 366         if ((tb[CFG_ANON_SWAP]) && blobmsg_get_u32(tb[CFG_ANON_SWAP]))
 367                 anon_swap = 1;
 368
 369         if ((tb[CFG_AUTO_MOUNT]) && blobmsg_get_u32(tb[CFG_AUTO_MOUNT]))
 370                 auto_mount = 1;
 371         if ((tb[CFG_AUTO_SWAP]) && blobmsg_get_u32(tb[CFG_AUTO_SWAP]))
 372                 auto_swap = 1;
 373
 374         if (tb[CFG_DELAY_ROOT])
 375                 delay_root = blobmsg_get_u32(tb[CFG_DELAY_ROOT]);
 376
 377         if ((tb[CFG_CHECK_FS]) && blobmsg_get_u32(tb[CFG_CHECK_FS]))
 378                 check_fs = 1;
 379
 380         return 0;
 381 }
 382
 383 static struct mount* find_swap(const char *uuid, const char *label, const char *device)
 384 {
 385         struct mount *m;
 386
 387         vlist_for_each_element(&mounts, m, node) {
 388                 if (m->type != TYPE_SWAP)
 389                         continue;
 390                 if (uuid && m->uuid && !strcasecmp(m->uuid, uuid))
 391                         return m;
 392                 if (label && m->label && !strcmp(m->label, label))
 393                         return m;
 394                 if (device && m->device && !strcmp(m->device, device))
 395                         return m;
 396         }
 397
 398         return NULL;
 399 }
 400
 401 static struct mount* find_block(const char *uuid, const char *label, const char *device,
 402                                 const char *target)
 403 {
 404         struct mount *m;
 405
 406         vlist_for_each_element(&mounts, m, node) {
 407                 if (m->type != TYPE_MOUNT)
 408                         continue;
 409                 if (m->uuid && uuid && !strcasecmp(m->uuid, uuid))
 410                         return m;
 411                 if (m->label && label && !strcmp(m->label, label))
 412                         return m;
 413                 if (m->target && target && !strcmp(m->target, target))
 414                         return m;
 415                 if (m->device && device && !strcmp(m->device, device))
 416                         return m;
 417         }
 418
 419         return NULL;
 420 }
 421
 422 static void mounts_update(struct vlist_tree *tree, struct vlist_node *node_new,
 423                           struct vlist_node *node_old)
 424 {
 425 }
 426
 427 static struct uci_package * config_try_load(struct uci_context *ctx, char *path)
 428 {
 429         char *file = basename(path);
 430         char *dir = dirname(path);
 431         char *err;
 432         struct uci_package *pkg;
 433
 434         uci_set_confdir(ctx, dir);
 435         KINFO("attempting to load %s/%s\n", dir, file);
 436
 437         if (uci_load(ctx, file, &pkg)) {
 438                 uci_get_errorstr(ctx, &err, file);
 439                 ERROR("unable to load configuration (%s)\n", err);
 440
 441                 free(err);
 442                 return NULL;
 443         }
 444
 445         return pkg;
 446 }
 447
 448 static int config_load(char *cfg)
 449 {
 450         struct uci_context *ctx = uci_alloc_context();
 451         struct uci_package *pkg = NULL;
 452         struct uci_element *e;
 453         char path[64];
 454
 455         vlist_init(&mounts, avl_strcmp, mounts_update);
 456
 457         if (cfg) {
 458                 snprintf(path, sizeof(path), "%s/upper/etc/config/fstab", cfg);
 459                 pkg = config_try_load(ctx, path);
 460
 461                 if (!pkg) {
 462                         snprintf(path, sizeof(path), "%s/etc/config/fstab", cfg);
 463                         pkg = config_try_load(ctx, path);
 464                 }
 465         }
 466
 467         if (!pkg) {
 468                 snprintf(path, sizeof(path), "/etc/config/fstab");
 469                 pkg = config_try_load(ctx, path);
 470         }
 471
 472         if (!pkg) {
 473                 ERROR("no usable configuration\n");
 474                 return -1;
 475         }
 476
 477         vlist_update(&mounts);
 478         uci_foreach_element(&pkg->sections, e) {
 479                 struct uci_section *s = uci_to_section(e);
 480
 481                 if (!strcmp(s->type, "mount"))
 482                         mount_add(s);
 483                 if (!strcmp(s->type, "swap"))
 484                         swap_add(s);
 485                 if (!strcmp(s->type, "global"))
 486                         global_add(s);
 487         }
 488         vlist_flush(&mounts);
 489
 490         return 0;
 491 }
 492
 493 static struct blkid_struct_probe* _probe_path(char *path)
 494 {
 495         struct blkid_struct_probe *pr;
 496
 497         pr = malloc(sizeof(*pr));
 498
 499         if (!pr)
 500                 return NULL;
 501
 502         memset(pr, 0, sizeof(*pr));
 503         probe_block(path, pr);
 504
 505         if (pr->err || !pr->id) {
 506                 free(pr);
 507                 return NULL;
 508         }
 509
 510         return pr;
 511 }
 512
 513 static int _cache_load(const char *path)
 514 {
 515         int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
 516         int j;
 517         glob_t gl;
 518
 519         if (glob(path, gl_flags, NULL, &gl) < 0)
 520                 return -1;
 521
 522         for (j = 0; j < gl.gl_pathc; j++) {
 523                 struct blkid_struct_probe *pr = _probe_path(gl.gl_pathv[j]);
 524                 if (pr)
 525                         list_add_tail(&pr->list, &devices);
 526         }
 527
 528         globfree(&gl);
 529
 530         return 0;
 531 }
 532
 533 static void cache_load(int mtd)
 534 {
 535         if (mtd) {
 536                 _cache_load("/dev/mtdblock*");
 537                 _cache_load("/dev/ubiblock*");
 538                 _cache_load("/dev/ubi?*_?*");
 539         }
 540         _cache_load("/dev/mmcblk*");
 541         _cache_load("/dev/sd*");
 542         _cache_load("/dev/hd*");
 543         _cache_load("/dev/md*");
 544         _cache_load("/dev/vd*");
 545         _cache_load("/dev/mapper/*");
 546 }
 547
 548 static int print_block_info(struct blkid_struct_probe *pr)
 549 {
 550         printf("%s:", pr->dev);
 551         if (pr->uuid[0])
 552                 printf(" UUID=\"%s\"", pr->uuid);
 553
 554         if (pr->label[0])
 555                 printf(" LABEL=\"%s\"", pr->label);
 556
 557         if (pr->name[0])
 558                 printf(" NAME=\"%s\"", pr->name);
 559
 560         if (pr->version[0])
 561                 printf(" VERSION=\"%s\"", pr->version);
 562
 563         printf(" TYPE=\"%s\"\n", pr->id->name);
 564
 565         return 0;
 566 }
 567
 568 static int print_block_uci(struct blkid_struct_probe *pr)
 569 {
 570         if (!strcmp(pr->id->name, "swap")) {
 571                 printf("config 'swap'\n");
 572         } else {
 573                 printf("config 'mount'\n");
 574                 printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev));
 575         }
 576         if (pr->uuid[0])
 577                 printf("\toption\tuuid\t'%s'\n", pr->uuid);
 578         else
 579                 printf("\toption\tdevice\t'%s'\n", pr->dev);
 580         printf("\toption\tenabled\t'0'\n\n");
 581
 582         return 0;
 583 }
 584
 585 static struct blkid_struct_probe* find_block_info(char *uuid, char *label, char *path)
 586 {
 587         struct blkid_struct_probe *pr = NULL;
 588
 589         if (uuid)
 590                 list_for_each_entry(pr, &devices, list)
 591                         if (!strcasecmp(pr->uuid, uuid))
 592                                 return pr;
 593
 594         if (label)
 595                 list_for_each_entry(pr, &devices, list)
 596                         if (!strcmp(pr->label, label))
 597                                 return pr;
 598
 599         if (path)
 600                 list_for_each_entry(pr, &devices, list)
 601                         if (!strcmp(basename(pr->dev), basename(path)))
 602                                 return pr;
 603
 604         return NULL;
 605 }
 606
 607 static char* find_mount_point(char *block)
 608 {
 609         FILE *fp = fopen("/proc/mounts", "r");
 610         static char line[256];
 611         int len = strlen(block);
 612         char *point = NULL;
 613
 614         if(!fp)
 615                 return NULL;
 616
 617         while (fgets(line, sizeof(line), fp)) {
 618                 if (!strncmp(line, block, len)) {
 619                         char *p = &line[len + 1];
 620                         char *t = strstr(p, " ");
 621
 622                         if (!t) {
 623                                 fclose(fp);
 624                                 return NULL;
 625                         }
 626                         *t = '\0';
 627                         point = p;
 628                         break;
 629                 }
 630         }
 631
 632         fclose(fp);
 633
 634         return point;
 635 }
 636
 637 static void mkdir_p(char *dir)
 638 {
 639         char *l = strrchr(dir, '/');
 640
 641         if (l) {
 642                 *l = '\0';
 643                 mkdir_p(dir);
 644                 *l = '/';
 645                 mkdir(dir, 0755);
 646         }
 647 }
 648
 649 static void check_filesystem(struct blkid_struct_probe *pr)
 650 {
 651         pid_t pid;
 652         struct stat statbuf;
 653         char *e2fsck = "/usr/sbin/e2fsck";
 654
 655         /* UBIFS does not need stuff like fsck */
 656         if (!strncmp(pr->id->name, "ubifs", 5))
 657                 return;
 658
 659         if (strncmp(pr->id->name, "ext", 3)) {
 660                 ERROR("check_filesystem: %s is not supported\n", pr->id->name);
 661                 return;
 662         }
 663
 664         if (stat(e2fsck, &statbuf) < 0) {
 665                 ERROR("check_filesystem: %s not found\n", e2fsck);
 666                 return;
 667         }
 668
 669         pid = fork();
 670         if (!pid) {
 671                 execl(e2fsck, e2fsck, "-p", pr->dev, NULL);
 672                 exit(-1);
 673         } else if (pid > 0) {
 674                 int status;
 675
 676                 waitpid(pid, &status, 0);
 677                 if (WEXITSTATUS(status))
 678                         ERROR("check_filesystem: %s returned %d\n", e2fsck, WEXITSTATUS(status));
 679         }
 680 }
 681
 682 static void handle_swapfiles(bool on)
 683 {
 684         struct stat s;
 685         struct mount *m;
 686         struct blkid_struct_probe *pr;
 687
 688         vlist_for_each_element(&mounts, m, node)
 689         {
 690                 if (m->type != TYPE_SWAP || !m->target)
 691                         continue;
 692
 693                 if (stat(m->target, &s) || !S_ISREG(s.st_mode))
 694                         continue;
 695
 696                 pr = _probe_path(m->target);
 697
 698                 if (!pr)
 699                         continue;
 700
 701                 if (!strcmp(pr->id->name, "swap")) {
 702                         if (on)
 703                                 swapon(pr->dev, m->prio);
 704                         else
 705                                 swapoff(pr->dev);
 706                 }
 707
 708                 free(pr);
 709         }
 710 }
 711
 712 static int mount_device(struct blkid_struct_probe *pr, int hotplug)
 713 {
 714         struct mount *m;
 715         char *device;
 716
 717         if (!pr)
 718                 return -1;
 719
 720         device = basename(pr->dev);
 721
 722         if (!strcmp(pr->id->name, "swap")) {
 723                 if (hotplug && !auto_swap)
 724                         return -1;
 725                 m = find_swap(pr->uuid, pr->label, device);
 726                 if (m || anon_swap)
 727                         swapon(pr->dev, (m) ? (m->prio) : (0));
 728
 729                 return 0;
 730         }
 731
 732         if (hotplug && !auto_mount)
 733                 return -1;
 734
 735         if (find_mount_point(pr->dev)) {
 736                 ERROR("%s is already mounted\n", pr->dev);
 737                 return -1;
 738         }
 739
 740         m = find_block(pr->uuid, pr->label, device, NULL);
 741         if (m && m->extroot)
 742                 return -1;
 743
 744         if (m) {
 745                 char *target = m->target;
 746                 char _target[32];
 747                 int err = 0;
 748
 749                 if (!target) {
 750                         snprintf(_target, sizeof(_target), "/mnt/%s", device);
 751                         target = _target;
 752                 }
 753                 mkdir_p(target);
 754
 755                 if (check_fs)
 756                         check_filesystem(pr);
 757
 758                 err = mount(pr->dev, target, pr->id->name, m->flags,
 759                             (m->options) ? (m->options) : (""));
 760                 if (err)
 761                         ERROR("mounting %s (%s) as %s failed (%d) - %s\n",
 762                               pr->dev, pr->id->name, target, err, strerror(err));
 763                 else
 764                         handle_swapfiles(true);
 765                 return err;
 766         }
 767
 768         if (anon_mount) {
 769                 char target[] = "/mnt/mmcblk123";
 770                 int err = 0;
 771
 772                 snprintf(target, sizeof(target), "/mnt/%s", device);
 773                 mkdir_p(target);
 774
 775                 if (check_fs)
 776                         check_filesystem(pr);
 777
 778                 err = mount(pr->dev, target, pr->id->name, 0, "");
 779                 if (err)
 780                         ERROR("mounting %s (%s) as %s failed (%d) - %s\n",
 781                                         pr->dev, pr->id->name, target, err, strerror(err));
 782                 else
 783                         handle_swapfiles(true);
 784                 return err;
 785         }
 786
 787         return 0;
 788 }
 789
 790 static int umount_device(struct blkid_struct_probe *pr)
 791 {
 792         struct mount *m;
 793         char *device = basename(pr->dev);
 794         char *mp;
 795         int err;
 796
 797         if (!pr)
 798                 return -1;
 799
 800         if (!strcmp(pr->id->name, "swap"))
 801                 return -1;
 802
 803         mp = find_mount_point(pr->dev);
 804         if (!mp)
 805                 return -1;
 806
 807         m = find_block(pr->uuid, pr->label, device, NULL);
 808         if (m && m->extroot)
 809                 return -1;
 810
 811         err = umount2(mp, MNT_DETACH);
 812         if (err)
 813                 ERROR("unmounting %s (%s)  failed (%d) - %s\n",
 814                         pr->dev, mp, err, strerror(err));
 815         else
 816                 ERROR("unmounted %s (%s)\n",
 817                         pr->dev, mp);
 818
 819         return err;
 820 }
 821
 822 static int main_hotplug(int argc, char **argv)
 823 {
 824         char path[32];
 825         char *action, *device, *mount_point;
 826
 827         action = getenv("ACTION");
 828         device = getenv("DEVNAME");
 829
 830         if (!action || !device)
 831                 return -1;
 832         snprintf(path, sizeof(path), "/dev/%s", device);
 833
 834         if (!strcmp(action, "remove")) {
 835                 int err = 0;
 836                 mount_point = find_mount_point(path);
 837                 if (mount_point)
 838                         err = umount2(mount_point, MNT_DETACH);
 839
 840                 if (err)
 841                         ERROR("umount of %s failed (%d) - %s\n",
 842                                         mount_point, err, strerror(err));
 843
 844                 return 0;
 845         } else if (strcmp(action, "add")) {
 846                 ERROR("Unkown action %s\n", action);
 847
 848                 return -1;
 849         }
 850
 851         if (config_load(NULL))
 852                 return -1;
 853         cache_load(0);
 854
 855         return mount_device(find_block_info(NULL, NULL, path), 1);
 856 }
 857
 858 static int find_block_mtd(char *name, char *part, int plen)
 859 {
 860         FILE *fp = fopen("/proc/mtd", "r");
 861         static char line[256];
 862         char *index = NULL;
 863
 864         if(!fp)
 865                 return -1;
 866
 867         while (!index && fgets(line, sizeof(line), fp)) {
 868                 if (strstr(line, name)) {
 869                         char *eol = strstr(line, ":");
 870
 871                         if (!eol)
 872                                 continue;
 873
 874                         *eol = '\0';
 875                         index = &line[3];
 876                 }
 877         }
 878
 879         fclose(fp);
 880
 881         if (!index)
 882                 return -1;
 883
 884         snprintf(part, plen, "/dev/mtdblock%s", index);
 885
 886         return 0;
 887 }
 888
 889 #ifdef UBIFS_EXTROOT
 890 static int find_ubi_vol(libubi_t libubi, char *name, int *dev_num, int *vol_id)
 891 {
 892         int dev = 0;
 893
 894         while (ubi_dev_present(libubi, dev))
 895         {
 896                 struct ubi_dev_info dev_info;
 897                 struct ubi_vol_info vol_info;
 898
 899                 if (ubi_get_dev_info1(libubi, dev++, &dev_info))
 900                         continue;
 901                 if (ubi_get_vol_info1_nm(libubi, dev_info.dev_num, name, &vol_info))
 902                         continue;
 903
 904                 *dev_num = dev_info.dev_num;
 905                 *vol_id = vol_info.vol_id;
 906
 907                 return 0;
 908         }
 909
 910         return -1;
 911 }
 912
 913 static int find_block_ubi(libubi_t libubi, char *name, char *part, int plen)
 914 {
 915         int dev_num;
 916         int vol_id;
 917         int err = -1;
 918
 919         err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
 920         if (!err)
 921                 snprintf(part, plen, "/dev/ubi%d_%d", dev_num, vol_id);
 922
 923         return err;
 924 }
 925
 926 static int find_block_ubi_RO(libubi_t libubi, char *name, char *part, int plen)
 927 {
 928         int dev_num;
 929         int vol_id;
 930         int err = -1;
 931
 932         err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
 933         if (!err)
 934                 snprintf(part, plen, "/dev/ubiblock%d_%d", dev_num, vol_id);
 935
 936         return err;
 937 }
 938 #endif
 939
 940 static int find_root_dev(char *buf, int len)
 941 {
 942         DIR *d;
 943         dev_t root;
 944         struct stat s;
 945         struct dirent *e;
 946
 947         if (stat("/", &s))
 948                 return -1;
 949
 950         if (!(d = opendir("/dev")))
 951                 return -1;
 952
 953         root = s.st_dev;
 954
 955         while ((e = readdir(d)) != NULL) {
 956                 snprintf(buf, len, "/dev/%s", e->d_name);
 957
 958                 if (stat(buf, &s) || s.st_rdev != root)
 959                         continue;
 960
 961                 closedir(d);
 962                 return 0;
 963         }
 964
 965         closedir(d);
 966         return -1;
 967 }
 968
 969 static int test_fs_support(const char *name)
 970 {
 971         char line[128], *p;
 972         int rv = -1;
 973         FILE *f;
 974
 975         if ((f = fopen("/proc/filesystems", "r")) != NULL) {
 976                 while (fgets(line, sizeof(line), f)) {
 977                         p = strtok(line, "\t\n");
 978
 979                         if (p && !strcmp(p, "nodev"))
 980                                 p = strtok(NULL, "\t\n");
 981
 982                         if (p && !strcmp(p, name)) {
 983                                 rv = 0;
 984                                 break;
 985                         }
 986                 }
 987                 fclose(f);
 988         }
 989
 990         return rv;
 991 }
 992
 993 static int check_extroot(char *path)
 994 {
 995         struct blkid_struct_probe *pr = NULL;
 996         char devpath[32];
 997
 998 #ifdef UBIFS_EXTROOT
 999         if (find_block_mtd("rootfs", devpath, sizeof(devpath))) {
1000                 int err = -1;
1001                 libubi_t libubi;
1002
1003                 libubi = libubi_open();
1004                 err = find_block_ubi_RO(libubi, "rootfs", devpath, sizeof(devpath));
1005                 libubi_close(libubi);
1006                 if (err)
1007                         return -1;
1008         }
1009 #else
1010         if (find_block_mtd("rootfs", devpath, sizeof(devpath))) {
1011                 if (find_root_dev(devpath, sizeof(devpath))) {
1012                         ERROR("extroot: unable to determine root device\n");
1013                         return -1;
1014                 }
1015         }
1016 #endif
1017
1018         list_for_each_entry(pr, &devices, list) {
1019                 if (!strcmp(pr->dev, devpath)) {
1020                         struct stat s;
1021                         FILE *fp = NULL;
1022                         char tag[64];
1023                         char uuid[64] = { 0 };
1024
1025                         snprintf(tag, sizeof(tag), "%s/etc", path);
1026                         if (stat(tag, &s))
1027                                 mkdir_p(tag);
1028
1029                         snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
1030                         if (stat(tag, &s)) {
1031                                 fp = fopen(tag, "w+");
1032                                 if (!fp) {
1033                                         ERROR("extroot: failed to write UUID to %s: %d (%s)\n",
1034                                               tag, errno, strerror(errno));
1035                                         /* return 0 to continue boot regardless of error */
1036                                         return 0;
1037                                 }
1038                                 fputs(pr->uuid, fp);
1039                                 fclose(fp);
1040                                 return 0;
1041                         }
1042
1043                         fp = fopen(tag, "r");
1044                         if (!fp) {
1045                                 ERROR("extroot: failed to read UUID from %s: %d (%s)\n",
1046                                       tag, errno, strerror(errno));
1047                                 return -1;
1048                         }
1049
1050                         fgets(uuid, sizeof(uuid), fp);
1051                         fclose(fp);
1052
1053                         if (!strcasecmp(uuid, pr->uuid))
1054                                 return 0;
1055
1056                         ERROR("extroot: UUID mismatch (root: %s, %s: %s)\n",
1057                               pr->uuid, basename(path), uuid);
1058                         return -1;
1059                 }
1060         }
1061
1062         ERROR("extroot: unable to lookup root device %s\n", devpath);
1063         return -1;
1064 }
1065
1066 /*
1067  * Read info about extroot from UCI (using prefix) and mount it.
1068  */
1069 static int mount_extroot(char *cfg)
1070 {
1071         char overlay[] = "/tmp/extroot/overlay";
1072         char mnt[] = "/tmp/extroot/mnt";
1073         char *path = mnt;
1074         struct blkid_struct_probe *pr;
1075         struct mount *m;
1076         int err = -1;
1077
1078         /* Load @cfg/etc/config/fstab */
1079         if (config_load(cfg))
1080                 return -2;
1081
1082         /* See if there is extroot-specific mount config */
1083         m = find_block(NULL, NULL, NULL, "/");
1084         if (!m)
1085                 m = find_block(NULL, NULL, NULL, "/overlay");
1086
1087         if (!m || !m->extroot)
1088         {
1089                 KINFO("extroot: not configured\n");
1090                 return -1;
1091         }
1092
1093         /* Find block device pointed by the mount config */
1094         pr = find_block_info(m->uuid, m->label, m->device);
1095
1096         if (!pr && delay_root){
1097                 KINFO("extroot: device not present, retrying in %u seconds\n", delay_root);
1098                 sleep(delay_root);
1099                 mkblkdev();
1100                 cache_load(0);
1101                 pr = find_block_info(m->uuid, m->label, m->device);
1102         }
1103         if (pr) {
1104                 if (strncmp(pr->id->name, "ext", 3) &&
1105                     strncmp(pr->id->name, "ubifs", 5)) {
1106                         ERROR("extroot: unsupported filesystem %s, try ext4\n", pr->id->name);
1107                         return -1;
1108                 }
1109
1110                 if (test_fs_support(pr->id->name)) {
1111                         ERROR("extroot: filesystem %s not supported by kernel\n", pr->id->name);
1112                         return -1;
1113                 }
1114
1115                 if (m->overlay)
1116                         path = overlay;
1117                 mkdir_p(path);
1118
1119                 if (check_fs)
1120                         check_filesystem(pr);
1121
1122                 err = mount(pr->dev, path, pr->id->name, 0, (m->options) ? (m->options) : (""));
1123
1124                 if (err) {
1125                         ERROR("extroot: mounting %s (%s) on %s failed: %d (%s)\n",
1126                               pr->dev, pr->id->name, path, err, strerror(err));
1127                 } else if (m->overlay) {
1128                         err = check_extroot(path);
1129                         if (err)
1130                                 umount(path);
1131                 }
1132         } else {
1133                 ERROR("extroot: cannot find device %s%s\n",
1134                       (m->uuid ? "with UUID " : (m->label ? "with label " : "")),
1135                       (m->uuid ? m->uuid : (m->label ? m->label : m->device)));
1136         }
1137
1138         return err;
1139 }
1140
1141 static int main_extroot(int argc, char **argv)
1142 {
1143         struct blkid_struct_probe *pr;
1144         char blkdev_path[32] = { 0 };
1145         int err = -1;
1146 #ifdef UBIFS_EXTROOT
1147         libubi_t libubi;
1148 #endif
1149
1150         if (!getenv("PREINIT"))
1151                 return -1;
1152
1153         if (argc != 2) {
1154                 fprintf(stderr, "Usage: block extroot\n");
1155                 return -1;
1156         }
1157
1158         kmsg = 1;
1159
1160         mkblkdev();
1161         cache_load(1);
1162
1163         /*
1164          * Look for "rootfs_data". We will want to mount it and check for
1165          * extroot configuration.
1166          */
1167
1168         /* Start with looking for MTD partition */
1169         find_block_mtd("rootfs_data", blkdev_path, sizeof(blkdev_path));
1170         if (blkdev_path[0]) {
1171                 pr = find_block_info(NULL, NULL, blkdev_path);
1172                 if (pr && !strcmp(pr->id->name, "jffs2")) {
1173                         char cfg[] = "/tmp/jffs_cfg";
1174
1175                         /*
1176                          * Mount MTD part and try extroot (using
1177                          * /etc/config/fstab from that partition)
1178                          */
1179                         mkdir_p(cfg);
1180                         if (!mount(blkdev_path, cfg, "jffs2", MS_NOATIME, NULL)) {
1181                                 err = mount_extroot(cfg);
1182                                 umount2(cfg, MNT_DETACH);
1183                         }
1184                         if (err < 0)
1185                                 rmdir("/tmp/overlay");
1186                         rmdir(cfg);
1187                         return err;
1188                 }
1189         }
1190
1191 #ifdef UBIFS_EXTROOT
1192         /* ... but it also could be an UBI volume */
1193         memset(blkdev_path, 0, sizeof(blkdev_path));
1194         libubi = libubi_open();
1195         find_block_ubi(libubi, "rootfs_data", blkdev_path, sizeof(blkdev_path));
1196         libubi_close(libubi);
1197         if (blkdev_path[0]) {
1198                 char cfg[] = "/tmp/ubifs_cfg";
1199
1200                 /* Mount volume and try extroot (using fstab from that vol) */
1201                 mkdir_p(cfg);
1202                 if (!mount(blkdev_path, cfg, "ubifs", MS_NOATIME, NULL)) {
1203                         err = mount_extroot(cfg);
1204                         umount2(cfg, MNT_DETACH);
1205                 }
1206                 if (err < 0)
1207                         rmdir("/tmp/overlay");
1208                 rmdir(cfg);
1209                 return err;
1210        }
1211 #endif
1212
1213         return mount_extroot(NULL);
1214 }
1215
1216 static int main_mount(int argc, char **argv)
1217 {
1218         struct blkid_struct_probe *pr;
1219
1220         if (config_load(NULL))
1221                 return -1;
1222
1223         cache_load(1);
1224         list_for_each_entry(pr, &devices, list)
1225                 mount_device(pr, 0);
1226
1227         handle_swapfiles(true);
1228
1229         return 0;
1230 }
1231
1232 static int main_umount(int argc, char **argv)
1233 {
1234         struct blkid_struct_probe *pr;
1235
1236         if (config_load(NULL))
1237                 return -1;
1238
1239         handle_swapfiles(false);
1240
1241         cache_load(0);
1242         list_for_each_entry(pr, &devices, list)
1243                 umount_device(pr);
1244
1245         return 0;
1246 }
1247
1248 static int main_detect(int argc, char **argv)
1249 {
1250         struct blkid_struct_probe *pr;
1251
1252         cache_load(0);
1253         printf("config 'global'\n");
1254         printf("\toption\tanon_swap\t'0'\n");
1255         printf("\toption\tanon_mount\t'0'\n");
1256         printf("\toption\tauto_swap\t'1'\n");
1257         printf("\toption\tauto_mount\t'1'\n");
1258         printf("\toption\tdelay_root\t'5'\n");
1259         printf("\toption\tcheck_fs\t'0'\n\n");
1260         list_for_each_entry(pr, &devices, list)
1261                 print_block_uci(pr);
1262
1263         return 0;
1264 }
1265
1266 static int main_info(int argc, char **argv)
1267 {
1268         int i;
1269         struct blkid_struct_probe *pr;
1270
1271         cache_load(1);
1272         if (argc == 2) {
1273                 list_for_each_entry(pr, &devices, list)
1274                         print_block_info(pr);
1275
1276                 return 0;
1277         };
1278
1279         for (i = 2; i < argc; i++) {
1280                 struct stat s;
1281
1282                 if (stat(argv[i], &s)) {
1283                         ERROR("failed to stat %s\n", argv[i]);
1284                         continue;
1285                 }
1286                 if (!S_ISBLK(s.st_mode)) {
1287                         ERROR("%s is not a block device\n", argv[i]);
1288                         continue;
1289                 }
1290                 pr = find_block_info(NULL, NULL, argv[i]);
1291                 if (pr)
1292                         print_block_info(pr);
1293         }
1294
1295         return 0;
1296 }
1297
1298 static int swapon_usage(void)
1299 {
1300         fprintf(stderr, "Usage: swapon [-s] [-a] [[-p pri] DEVICE]\n\n"
1301                 "\tStart swapping on [DEVICE]\n"
1302                 " -a\tStart swapping on all swap devices\n"
1303                 " -p pri\tSet priority of swap device\n"
1304                 " -s\tShow summary\n");
1305         return -1;
1306 }
1307
1308 static int main_swapon(int argc, char **argv)
1309 {
1310         int ch;
1311         FILE *fp;
1312         char *lineptr;
1313         size_t s;
1314         struct blkid_struct_probe *pr;
1315         int flags = 0;
1316         int pri;
1317         struct stat st;
1318         int err;
1319
1320         while ((ch = getopt(argc, argv, "ap:s")) != -1) {
1321                 switch(ch) {
1322                 case 's':
1323                         fp = fopen("/proc/swaps", "r");
1324                         lineptr = NULL;
1325
1326                         if (!fp) {
1327                                 ERROR("failed to open /proc/swaps\n");
1328                                 return -1;
1329                         }
1330                         while (getline(&lineptr, &s, fp) > 0)
1331                                 printf(lineptr);
1332                         if (lineptr)
1333                                 free(lineptr);
1334                         fclose(fp);
1335                         return 0;
1336                 case 'a':
1337                         cache_load(0);
1338                         list_for_each_entry(pr, &devices, list) {
1339                                 if (strcmp(pr->id->name, "swap"))
1340                                         continue;
1341                                 if (swapon(pr->dev, 0))
1342                                         ERROR("failed to swapon %s\n", pr->dev);
1343                         }
1344                         return 0;
1345                 case 'p':
1346                         pri = atoi(optarg);
1347                         if (pri >= 0)
1348                                 flags = ((pri << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
1349                         break;
1350                 default:
1351                         return swapon_usage();
1352                 }
1353
1354         }
1355
1356         if (optind != (argc - 1))
1357                 return swapon_usage();
1358
1359         if (stat(argv[optind], &st) || (!S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))) {
1360                 ERROR("%s is not a block device or file\n", argv[optind]);
1361                 return -1;
1362         }
1363         err = swapon(argv[optind], flags);
1364         if (err) {
1365                 ERROR("failed to swapon %s (%d)\n", argv[optind], err);
1366                 return err;
1367         }
1368
1369         return 0;
1370 }
1371
1372 static int main_swapoff(int argc, char **argv)
1373 {
1374         if (argc != 2) {
1375                 ERROR("Usage: swapoff [-a] [DEVICE]\n\n"
1376                         "\tStop swapping on DEVICE\n"
1377                         " -a\tStop swapping on all swap devices\n");
1378                 return -1;
1379         }
1380
1381         if (!strcmp(argv[1], "-a")) {
1382                 FILE *fp = fopen("/proc/swaps", "r");
1383                 char line[256];
1384
1385                 if (!fp) {
1386                         ERROR("failed to open /proc/swaps\n");
1387                         return -1;
1388                 }
1389                 fgets(line, sizeof(line), fp);
1390                 while (fgets(line, sizeof(line), fp)) {
1391                         char *end = strchr(line, ' ');
1392                         int err;
1393
1394                         if (!end)
1395                                 continue;
1396                         *end = '\0';
1397                         err = swapoff(line);
1398                         if (err)
1399                                 ERROR("failed to swapoff %s (%d)\n", line, err);
1400                 }
1401                 fclose(fp);
1402         } else {
1403                 struct stat s;
1404                 int err;
1405
1406                 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1407                         ERROR("%s is not a block device or file\n", argv[1]);
1408                         return -1;
1409                 }
1410                 err = swapoff(argv[1]);
1411                 if (err) {
1412                         ERROR("fsiled to swapoff %s (%d)\n", argv[1], err);
1413                         return err;
1414                 }
1415         }
1416
1417         return 0;
1418 }
1419
1420 int main(int argc, char **argv)
1421 {
1422         char *base = basename(*argv);
1423
1424         umask(0);
1425
1426         if (!strcmp(base, "swapon"))
1427                 return main_swapon(argc, argv);
1428
1429         if (!strcmp(base, "swapoff"))
1430                 return main_swapoff(argc, argv);
1431
1432         if ((argc > 1) && !strcmp(base, "block")) {
1433                 if (!strcmp(argv[1], "info"))
1434                         return main_info(argc, argv);
1435
1436                 if (!strcmp(argv[1], "detect"))
1437                         return main_detect(argc, argv);
1438
1439                 if (!strcmp(argv[1], "hotplug"))
1440                         return main_hotplug(argc, argv);
1441
1442                 if (!strcmp(argv[1], "extroot"))
1443                         return main_extroot(argc, argv);
1444
1445                 if (!strcmp(argv[1], "mount"))
1446                         return main_mount(argc, argv);
1447
1448                 if (!strcmp(argv[1], "umount"))
1449                         return main_umount(argc, argv);
1450         }
1451
1452         fprintf(stderr, "Usage: block <info|mount|umount|detect>\n");
1453
1454         return -1;
1455 }