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 #include <stdio.h>
  16 #include <unistd.h>
  17 #include <syslog.h>
  18 #include <libgen.h>
  19 #include <glob.h>
  20
  21 #include <sys/stat.h>
  22 #include <sys/types.h>
  23 #include <sys/swap.h>
  24 #include <sys/mount.h>
  25
  26 #include <uci.h>
  27 #include <uci_blob.h>
  28
  29 #include <libubox/list.h>
  30 #include <libubox/vlist.h>
  31 #include <libubox/blobmsg_json.h>
  32 #include <libubox/avl-cmp.h>
  33
  34 #include "libblkid-tiny/libblkid-tiny.h"
  35
  36 enum {
  37         TYPE_MOUNT,
  38         TYPE_SWAP,
  39 };
  40
  41 struct mount {
  42         struct vlist_node node;
  43         int type;
  44
  45         char *target;
  46         char *path;
  47         char *options;
  48         char *uuid;
  49         char *label;
  50         int disabled_fsck;
  51         unsigned int prio;
  52 };
  53
  54 static struct vlist_tree mounts;
  55 static struct blob_buf b;
  56 static LIST_HEAD(devices);
  57
  58 enum {
  59         MOUNT_UUID,
  60         MOUNT_LABEL,
  61         MOUNT_ENABLE,
  62         MOUNT_TARGET,
  63         MOUNT_OPTIONS,
  64         __MOUNT_MAX
  65 };
  66
  67 static const struct blobmsg_policy mount_policy[__MOUNT_MAX] = {
  68         [MOUNT_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
  69         [MOUNT_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
  70         [MOUNT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
  71         [MOUNT_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_STRING },
  72         [MOUNT_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
  73 };
  74
  75 static const struct uci_blob_param_list mount_attr_list = {
  76         .n_params = __MOUNT_MAX,
  77         .params = mount_policy,
  78 };
  79
  80 enum {
  81         SWAP_ENABLE,
  82         SWAP_UUID,
  83         SWAP_PRIO,
  84         __SWAP_MAX
  85 };
  86
  87 static const struct blobmsg_policy swap_policy[__SWAP_MAX] = {
  88         [SWAP_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
  89         [SWAP_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
  90         [SWAP_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 },
  91 };
  92
  93 static const struct uci_blob_param_list swap_attr_list = {
  94         .n_params = __SWAP_MAX,
  95         .params = swap_policy,
  96 };
  97
  98 static char *blobmsg_get_strdup(struct blob_attr *attr)
  99 {
 100         if (!attr)
 101                 return NULL;
 102
 103         return strdup(blobmsg_get_string(attr));
 104 }
 105
 106 static int mount_add(struct uci_section *s)
 107 {
 108         struct blob_attr *tb[__MOUNT_MAX] = { 0 };
 109         struct mount *m;
 110
 111         blob_buf_init(&b, 0);
 112         uci_to_blob(&b, s, &mount_attr_list);
 113         blobmsg_parse(mount_policy, __MOUNT_MAX, tb, blob_data(b.head), blob_len(b.head));
 114
 115         if (!tb[MOUNT_LABEL] && !tb[MOUNT_UUID])
 116                 return -1;
 117
 118         if (!tb[MOUNT_TARGET])
 119                 return -1;
 120
 121         m = malloc(sizeof(struct mount));
 122         m->type = TYPE_MOUNT;
 123         m->uuid = blobmsg_get_strdup(tb[MOUNT_UUID]);
 124         m->label = blobmsg_get_strdup(tb[MOUNT_LABEL]);
 125         m->target = blobmsg_get_strdup(tb[MOUNT_TARGET]);
 126         m->options = blobmsg_get_strdup(tb[MOUNT_OPTIONS]);
 127
 128         if ((!tb[MOUNT_ENABLE]) || blobmsg_get_u32(tb[MOUNT_ENABLE]))
 129                 vlist_add(&mounts, &m->node, m->target);
 130
 131         return 0;
 132 }
 133
 134 static int swap_add(struct uci_section *s)
 135 {
 136         struct blob_attr *tb[__SWAP_MAX] = { 0 };
 137         struct mount *m;
 138
 139         blob_buf_init(&b, 0);
 140         uci_to_blob(&b, s, &swap_attr_list);
 141         blobmsg_parse(swap_policy, __SWAP_MAX, tb, blob_data(b.head), blob_len(b.head));
 142
 143         if (!tb[SWAP_UUID])
 144                 return -1;
 145
 146         m = malloc(sizeof(struct mount));
 147         memset(m, 0, sizeof(struct mount));
 148         m->type = TYPE_SWAP;
 149         m->uuid = blobmsg_get_strdup(tb[SWAP_UUID]);
 150         if (tb[SWAP_PRIO])
 151                 m->prio = blobmsg_get_u32(tb[SWAP_PRIO]);
 152         if (m->prio)
 153                 m->prio = ((m->prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
 154
 155         if ((!tb[SWAP_ENABLE]) || blobmsg_get_u32(tb[SWAP_ENABLE]))
 156                 vlist_add(&mounts, &m->node, m->uuid);
 157
 158         return 0;
 159 }
 160
 161 static struct mount* find_swap(const char *uuid)
 162 {
 163         struct mount *m;
 164
 165         if (!uuid)
 166                 return NULL;
 167
 168         vlist_for_each_element(&mounts, m, node)
 169                 if ((m->type == TYPE_SWAP) && m->uuid && !strcmp(m->uuid, uuid))
 170                         return m;
 171
 172         return NULL;
 173 }
 174
 175 static struct mount* find_block(const char *uuid, const char *label, const char *target)
 176 {
 177         struct mount *m;
 178
 179         vlist_for_each_element(&mounts, m, node) {
 180                 if ((m->type == TYPE_MOUNT) && m->uuid && uuid && !strcmp(m->uuid, uuid))
 181                         return m;
 182                 if ((m->type == TYPE_MOUNT) && m->label && label && !strcmp(m->label, label))
 183                         return m;
 184                 if ((m->type == TYPE_MOUNT) && target && !strcmp(m->target, target))
 185                         return m;
 186         }
 187
 188         return NULL;
 189 }
 190
 191 static void mounts_update(struct vlist_tree *tree, struct vlist_node *node_new,
 192                           struct vlist_node *node_old)
 193 {
 194 }
 195
 196 static int config_load(char *cfg)
 197 {
 198         struct uci_context *ctx;
 199         struct uci_package *pkg;
 200         struct uci_element *e;
 201
 202         vlist_init(&mounts, avl_strcmp, mounts_update);
 203
 204         ctx = uci_alloc_context();
 205         if (cfg) {
 206                 char path[32];
 207                 snprintf(path, 32, "%s/etc/config", cfg);
 208                 uci_set_confdir(ctx, path);
 209         }
 210
 211         if (uci_load(ctx, "fstab", &pkg))
 212                 return -1;
 213
 214         vlist_update(&mounts);
 215         uci_foreach_element(&pkg->sections, e) {
 216                 struct uci_section *s = uci_to_section(e);
 217
 218                 if (!strcmp(s->type, "mount"))
 219                         mount_add(s);
 220                 if (!strcmp(s->type, "swap"))
 221                         swap_add(s);
 222         }
 223         vlist_flush(&mounts);
 224
 225         return 0;
 226 }
 227
 228 static int _cache_load(const char *path)
 229 {
 230         int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
 231         int j;
 232         glob_t gl;
 233
 234         if (glob(path, gl_flags, NULL, &gl) < 0)
 235                 return -1;
 236
 237         for (j = 0; j < gl.gl_pathc; j++) {
 238                 struct blkid_struct_probe *pr = malloc(sizeof(struct blkid_struct_probe));
 239                 memset(pr, 0, sizeof(struct blkid_struct_probe));
 240                 probe_block(gl.gl_pathv[j], pr);
 241                 if (pr->err)
 242                         free(pr);
 243                 else
 244                         list_add_tail(&pr->list, &devices);
 245         }
 246
 247         globfree(&gl);
 248
 249         return 0;
 250 }
 251
 252 static void cache_load(int mtd)
 253 {
 254         if (mtd)
 255                 _cache_load("/dev/mtdblock*");
 256         _cache_load("/dev/sd*");
 257         _cache_load("/dev/mmcblk*");
 258 }
 259
 260 static int print_block_info(struct blkid_struct_probe *pr)
 261 {
 262         printf("%s:", pr->dev);
 263         if (pr->uuid[0])
 264                 printf(" UUID=\"%s\"", pr->uuid);
 265
 266         if (pr->label[0])
 267                 printf(" LABEL=\"%s\"", pr->label);
 268
 269         if (pr->name[0])
 270                 printf(" NAME=\"%s\"", pr->name);
 271
 272         if (pr->version[0])
 273                 printf(" VERSION=\"%s\"", pr->version);
 274
 275         printf(" TYPE=\"%s\"\n", pr->id->name);
 276
 277         return 0;
 278 }
 279
 280 static int print_block_uci(struct blkid_struct_probe *pr)
 281 {
 282         if (!pr->uuid[0])
 283                 return 0;
 284
 285         if (!strcmp(pr->id->name, "swap")) {
 286                 printf("config 'swap'\n");
 287         } else {
 288                 printf("config 'mount'\n");
 289                 printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev));
 290         }
 291         printf("\toption\tuuid\t'%s'\n", pr->uuid);
 292         printf("\toption\tenabled\t'0'\n\n");
 293
 294         return 0;
 295 }
 296
 297 static struct blkid_struct_probe* find_block_info(char *uuid, char *label, char *path)
 298 {
 299         struct blkid_struct_probe *pr = NULL;
 300
 301         if (uuid)
 302                 list_for_each_entry(pr, &devices, list)
 303                         if (!strcmp(pr->uuid, uuid))
 304                                 return pr;
 305
 306         if (label)
 307                 list_for_each_entry(pr, &devices, list)
 308                         if (strcmp(pr->label, label))
 309                                 return pr;
 310
 311         if (path)
 312                 list_for_each_entry(pr, &devices, list)
 313                         if (!strcmp(pr->dev, path))
 314                                 return pr;
 315
 316         return NULL;
 317 }
 318
 319 static char* find_mount_point(char *block)
 320 {
 321         FILE *fp = fopen("/proc/mounts", "r");
 322         static char line[256];
 323         int len = strlen(block);
 324         char *point = NULL;
 325
 326         if(!fp)
 327                 return NULL;
 328
 329         while (fgets(line, sizeof(line), fp)) {
 330                 if (!strncmp(line, block, len)) {
 331                         char *p = &line[len + 1];
 332                         char *t = strstr(p, " ");
 333
 334                         if (!t)
 335                                 return NULL;
 336                         *t = '\0';
 337                         point = p;
 338                         break;
 339                 }
 340         }
 341
 342         fclose(fp);
 343
 344         return point;
 345 }
 346
 347 static void mkdir_p(char *dir)
 348 {
 349         char *l = strrchr(dir, '/');
 350
 351         if (l) {
 352                 *l = '\0';
 353                 mkdir_p(dir);
 354                 *l = '/';
 355                 mkdir(dir, 0755);
 356         }
 357 }
 358
 359 static int main_hotplug(int argc, char **argv)
 360 {
 361         struct mount *m;
 362         char path[256];
 363         char *action, *device, *mount_point;
 364         struct blkid_struct_probe *pr;
 365
 366         action = getenv("ACTION");
 367         device = getenv("DEVNAME");
 368
 369         if (!action || !device)
 370                 return -1;
 371         snprintf(path, sizeof(path), "/dev/%s", device);
 372
 373         if (!strcmp(action, "remove")) {
 374                 int err = 0;
 375                 mount_point = find_mount_point(path);
 376                 if (mount_point)
 377                         err = umount2(mount_point, MNT_DETACH);
 378
 379                 if (err)
 380                         fprintf(stderr, "unmount of %s failed (%d) - %s\n",
 381                                         mount_point, err, strerror(err));
 382
 383                 return 0;
 384         } else if (strcmp(action, "add")) {
 385                 fprintf(stderr, "Unkown action %s\n", action);
 386
 387                 return -1;
 388         }
 389
 390         if (config_load(NULL))
 391                 return -1;
 392         cache_load(0);
 393
 394         pr = find_block_info(NULL, NULL, path);
 395         if (!pr && pr->uuid) {
 396                 fprintf(stderr, "failed to read blockinfo for %s\n", path);
 397                 return -1;
 398         }
 399
 400         m = find_swap(pr->uuid);
 401         if (m) {
 402                 if (!strcmp(action, "add"))
 403                         swapon(path, m->prio);
 404                 else
 405                         swapoff(path);
 406         } else {
 407                 m = find_block(pr->uuid, pr->label, NULL);
 408                 if (m && strcmp(m->target, "/")) {
 409                         int err = 0;
 410
 411                         mkdir_p(m->target);
 412                         err = mount(path, m->target, pr->id->name, 0, (m->options) ? (m->options) : (""));
 413                         if (err)
 414                                 fprintf(stderr, "mounting %s (%s) as %s failed (%d) - %s\n",
 415                                                 path, pr->id->name, m->target, err, strerror(err));
 416                 }
 417         }
 418
 419         return 0;
 420 }
 421
 422 static int find_block_mtd(char *name, char *part, int plen)
 423 {
 424         FILE *fp = fopen("/proc/mtd", "r");
 425         static char line[256];
 426         char *index = NULL;
 427
 428         if(!fp)
 429                 return -1;
 430
 431         while (!index && fgets(line, sizeof(line), fp)) {
 432                 if (strstr(line, name)) {
 433                         char *eol = strstr(line, ":");
 434
 435                         if (!eol)
 436                                 continue;
 437
 438                         *eol = '\0';
 439                         index = &line[3];
 440                 }
 441         }
 442
 443         fclose(fp);
 444
 445         if (!index)
 446                 return -1;
 447
 448         snprintf(part, plen, "/dev/mtdblock%s", index);
 449
 450         return 0;
 451 }
 452
 453 static int check_extroot(char *path)
 454 {
 455         struct blkid_struct_probe *pr = NULL;
 456         char fs[32];
 457
 458         if (find_block_mtd("rootfs", fs, sizeof(fs)))
 459                 return -1;
 460
 461         list_for_each_entry(pr, &devices, list) {
 462                 if (!strcmp(pr->dev, fs)) {
 463                         struct stat s;
 464                         FILE *fp = NULL;
 465                         char tag[32];
 466                         char uuid[32] = { 0 };
 467
 468                         snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
 469                         if (stat(tag, &s)) {
 470                                 fp = fopen(tag, "w+");
 471                                 if (!fp) {
 472                                         fprintf(stderr, "extroot: failed to write uuid tag file\n");
 473                                         /* return 0 to continue boot regardless of error */
 474                                         return 0;
 475                                 }
 476                                 fputs(pr->uuid, fp);
 477                                 fclose(fp);
 478                                 return 0;
 479                         }
 480
 481                         fp = fopen(tag, "r");
 482                         if (!fp) {
 483                                 fprintf(stderr, "extroot: failed to open uuid tag file\n");
 484                                 return -1;
 485                         }
 486
 487                         fgets(uuid, sizeof(uuid), fp);
 488                         fclose(fp);
 489                         if (!strcmp(uuid, pr->uuid))
 490                                 return 0;
 491                         fprintf(stderr, "extroot: uuid tag does not match rom uuid\n");
 492                 }
 493         }
 494         return -1;
 495 }
 496
 497 static int mount_extroot(char *path, char *cfg)
 498 {
 499         struct blkid_struct_probe *pr;
 500         struct mount *m;
 501         int err = -1;
 502
 503         if (config_load(cfg))
 504                 return 2;
 505
 506         m = find_block(NULL, NULL, "/");
 507         if (!m)
 508                 return 1;
 509
 510         pr = find_block_info(m->uuid, m->label, NULL);
 511         if (pr) {
 512                 mkdir_p(path);
 513                 err = mount(pr->dev, path, pr->id->name, 0, (m->options) ? (m->options) : (""));
 514
 515                 if (err) {
 516                         fprintf(stderr, "mounting %s (%s) as %s failed (%d) - %s\n",
 517                                         pr->dev, pr->id->name, path, err, strerror(err));
 518                 } else {
 519                         err = check_extroot(path);
 520                         if (err)
 521                                 umount(path);
 522                 }
 523         }
 524
 525         return err;
 526 }
 527
 528 static int main_extroot(int argc, char **argv)
 529 {
 530         struct blkid_struct_probe *pr;
 531         char fs[32] = { 0 };
 532         char fs_data[32] = { 0 };
 533         int err = 1;
 534         char extroot[] = "/tmp/overlay";
 535
 536         if (!getenv("PREINIT"))
 537                 return -1;
 538
 539         if (argc != 2) {
 540                 fprintf(stderr, "Usage: block extroot mountpoint\n");
 541                 return 1;
 542         }
 543
 544         mkblkdev();
 545         cache_load(1);
 546
 547         find_block_mtd("rootfs", fs, sizeof(fs));
 548         if (!fs[0])
 549                 return 2;
 550
 551         pr = find_block_info(NULL, NULL, fs);
 552         if (!pr || strcmp(pr->id->name, "squashfs"))
 553                 return 3;
 554
 555         find_block_mtd("rootfs_data", fs_data, sizeof(fs_data));
 556         if (fs_data[0]) {
 557                 pr = find_block_info(NULL, NULL, fs_data);
 558                 if (pr && !strcmp(pr->id->name, "jffs2")) {
 559                         char cfg[] = "/tmp/jffs_cfg";
 560
 561                         mkdir_p(cfg);
 562                         if (!mount(fs_data, cfg, "jffs2", MS_NOATIME, NULL)) {
 563                                 err = mount_extroot(extroot, cfg);
 564                                 umount2(cfg, MNT_DETACH);
 565                         }
 566                         if (err)
 567                                 rmdir(extroot);
 568                         rmdir(cfg);
 569                         return err;
 570                 }
 571         }
 572
 573         err = mount_extroot(extroot, NULL);
 574
 575         return err;
 576 }
 577
 578 static int main_detect(int argc, char **argv)
 579 {
 580         struct blkid_struct_probe *pr;
 581
 582         cache_load(0);
 583         list_for_each_entry(pr, &devices, list)
 584                 print_block_uci(pr);
 585
 586         return 0;
 587 }
 588
 589 static int main_info(int argc, char **argv)
 590 {
 591         int i;
 592         struct blkid_struct_probe *pr;
 593
 594         cache_load(1);
 595         if (argc == 2) {
 596                 list_for_each_entry(pr, &devices, list)
 597                         print_block_info(pr);
 598
 599                 return 0;
 600         };
 601
 602         for (i = 2; i < argc; i++) {
 603                 struct stat s;
 604
 605                 if (stat(argv[i], &s)) {
 606                         fprintf(stderr, "failed to stat %s\n", argv[i]);
 607                         continue;
 608                 }
 609                 if (!S_ISBLK(s.st_mode)) {
 610                         fprintf(stderr, "%s is not a block device\n", argv[i]);
 611                         continue;
 612                 }
 613                 pr = find_block_info(NULL, NULL, argv[i]);
 614                 if (pr)
 615                         print_block_info(pr);
 616         }
 617
 618         return 0;
 619 }
 620
 621 static int main_swapon(int argc, char **argv)
 622 {
 623         if (argc != 2) {
 624                 fprintf(stderr, "Usage: swapoff [-a] [DEVICE]\n\nStop swapping on DEVICE\n\n\t-a      Stop swapping on all swap devices\n");
 625                 return -1;
 626         }
 627
 628         if (!strcmp(argv[1], "-a")) {
 629                 struct blkid_struct_probe *pr;
 630
 631                 cache_load(0);
 632                 list_for_each_entry(pr, &devices, list) {
 633                         if (strcmp(pr->id->name, "swap"))
 634                                 continue;
 635                         if (swapon(pr->dev, 0))
 636                                 fprintf(stderr, "failed to swapon %s\n", pr->dev);
 637                 }
 638         } else {
 639                 struct stat s;
 640                 int err;
 641
 642                 if (stat(argv[1], &s) || !S_ISBLK(s.st_mode)) {
 643                         fprintf(stderr, "%s is not a block device\n", argv[1]);
 644                         return -1;
 645                 }
 646                 err = swapon(argv[1], 0);
 647                 if (err) {
 648                         fprintf(stderr, "failed to swapon %s (%d)\n", argv[1], err);
 649                         return err;
 650                 }
 651         }
 652
 653         return 0;
 654 }
 655
 656 static int main_swapoff(int argc, char **argv)
 657 {
 658         if (argc != 2) {
 659                 fprintf(stderr, "Usage: swapoff [-a] [DEVICE]\n\nStop swapping on DEVICE\n\n\t-a      Stop swapping on all swap devices\n");
 660                 return -1;
 661         }
 662
 663         if (!strcmp(argv[1], "-a")) {
 664                 FILE *fp = fopen("/proc/swaps", "r");
 665                 char line[256];
 666
 667                 if (!fp) {
 668                         fprintf(stderr, "failed to open /proc/swaps\n");
 669                         return -1;
 670                 }
 671                 fgets(line, sizeof(line), fp);
 672                 while (fgets(line, sizeof(line), fp)) {
 673                         char *end = strchr(line, ' ');
 674                         int err;
 675
 676                         if (!end)
 677                                 continue;
 678                         *end = '\0';
 679                         err = swapoff(line);
 680                         if (err)
 681                                 fprintf(stderr, "failed to swapoff %s (%d)\n", line, err);
 682                 }
 683                 fclose(fp);
 684         } else {
 685                 struct stat s;
 686                 int err;
 687
 688                 if (stat(argv[1], &s) || !S_ISBLK(s.st_mode)) {
 689                         fprintf(stderr, "%s is not a block device\n", argv[1]);
 690                         return -1;
 691                 }
 692                 err = swapoff(argv[1]);
 693                 if (err) {
 694                         fprintf(stderr, "fsiled to swapoff %s (%d)\n", argv[1], err);
 695                         return err;
 696                 }
 697         }
 698
 699         return 0;
 700 }
 701
 702 int main(int argc, char **argv)
 703 {
 704         char *base = basename(*argv);
 705
 706         if (!strcmp(base, "swapon"))
 707                 return main_swapon(argc, argv);
 708
 709         if (!strcmp(base, "swapoff"))
 710                 return main_swapoff(argc, argv);
 711
 712         if ((argc > 1) && !strcmp(base, "block")) {
 713                 if (!strcmp(argv[1], "info"))
 714                         return main_info(argc, argv);
 715
 716                 if (!strcmp(argv[1], "detect"))
 717                         return main_detect(argc, argv);
 718
 719                 if (!strcmp(argv[1], "hotplug"))
 720                         return main_hotplug(argc, argv);
 721
 722                 if (!strcmp(argv[1], "extroot"))
 723                         return main_extroot(argc, argv);
 724         }
 725
 726         fprintf(stderr, "Usage: block <info|detect>\n");
 727
 728         return -1;
 729 }