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