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         char *device;
  51         int extroot;
  52         int overlay;
  53         int disabled_fsck;
  54         unsigned int prio;
  55 };
  56
  57 static struct vlist_tree mounts;
  58 static struct blob_buf b;
  59 static LIST_HEAD(devices);
  60 static int anon_mount, anon_swap;
  61
  62 enum {
  63         CFG_ANON_MOUNT,
  64         CFG_ANON_SWAP,
  65         __CFG_MAX
  66 };
  67
  68 static const struct blobmsg_policy config_policy[__CFG_MAX] = {
  69         [CFG_ANON_SWAP] = { .name = "anon_swap", .type = BLOBMSG_TYPE_INT32 },
  70         [CFG_ANON_MOUNT] = { .name = "anon_mount", .type = BLOBMSG_TYPE_INT32 },
  71 };
  72
  73 enum {
  74         MOUNT_UUID,
  75         MOUNT_LABEL,
  76         MOUNT_ENABLE,
  77         MOUNT_TARGET,
  78         MOUNT_DEVICE,
  79         MOUNT_OPTIONS,
  80         __MOUNT_MAX
  81 };
  82
  83 static const struct uci_blob_param_list config_attr_list = {
  84         .n_params = __CFG_MAX,
  85         .params = config_policy,
  86 };
  87
  88 static const struct blobmsg_policy mount_policy[__MOUNT_MAX] = {
  89         [MOUNT_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
  90         [MOUNT_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
  91         [MOUNT_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
  92         [MOUNT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
  93         [MOUNT_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_STRING },
  94         [MOUNT_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
  95 };
  96
  97 static const struct uci_blob_param_list mount_attr_list = {
  98         .n_params = __MOUNT_MAX,
  99         .params = mount_policy,
 100 };
 101
 102 enum {
 103         SWAP_ENABLE,
 104         SWAP_UUID,
 105         SWAP_DEVICE,
 106         SWAP_PRIO,
 107         __SWAP_MAX
 108 };
 109
 110 static const struct blobmsg_policy swap_policy[__SWAP_MAX] = {
 111         [SWAP_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
 112         [SWAP_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
 113         [SWAP_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
 114         [SWAP_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 },
 115 };
 116
 117 static const struct uci_blob_param_list swap_attr_list = {
 118         .n_params = __SWAP_MAX,
 119         .params = swap_policy,
 120 };
 121
 122 static char *blobmsg_get_strdup(struct blob_attr *attr)
 123 {
 124         if (!attr)
 125                 return NULL;
 126
 127         return strdup(blobmsg_get_string(attr));
 128 }
 129
 130 static int mount_add(struct uci_section *s)
 131 {
 132         struct blob_attr *tb[__MOUNT_MAX] = { 0 };
 133         struct mount *m;
 134
 135         blob_buf_init(&b, 0);
 136         uci_to_blob(&b, s, &mount_attr_list);
 137         blobmsg_parse(mount_policy, __MOUNT_MAX, tb, blob_data(b.head), blob_len(b.head));
 138
 139         if (!tb[MOUNT_LABEL] && !tb[MOUNT_UUID] && !tb[MOUNT_DEVICE])
 140                 return -1;
 141
 142         if (tb[MOUNT_ENABLE] && !blobmsg_get_u32(tb[MOUNT_ENABLE]))
 143                 return -1;
 144
 145         m = malloc(sizeof(struct mount));
 146         m->type = TYPE_MOUNT;
 147         m->uuid = blobmsg_get_strdup(tb[MOUNT_UUID]);
 148         m->label = blobmsg_get_strdup(tb[MOUNT_LABEL]);
 149         m->target = blobmsg_get_strdup(tb[MOUNT_TARGET]);
 150         m->options = blobmsg_get_strdup(tb[MOUNT_OPTIONS]);
 151         m->device = blobmsg_get_strdup(tb[MOUNT_DEVICE]);
 152         m->overlay = m->extroot = 0;
 153         if (m->target && !strcmp(m->target, "/"))
 154                 m->extroot = 1;
 155         if (m->target && !strcmp(m->target, "/overlay"))
 156                 m->extroot = m->overlay = 1;
 157
 158         if (m->uuid)
 159                 vlist_add(&mounts, &m->node, m->uuid);
 160         else if (m->label)
 161                 vlist_add(&mounts, &m->node, m->label);
 162         else if (m->device)
 163                 vlist_add(&mounts, &m->node, m->device);
 164
 165         return 0;
 166 }
 167
 168 static int swap_add(struct uci_section *s)
 169 {
 170         struct blob_attr *tb[__SWAP_MAX] = { 0 };
 171         struct mount *m;
 172
 173         blob_buf_init(&b, 0);
 174         uci_to_blob(&b, s, &swap_attr_list);
 175         blobmsg_parse(swap_policy, __SWAP_MAX, tb, blob_data(b.head), blob_len(b.head));
 176
 177         if (!tb[SWAP_UUID] && !tb[SWAP_DEVICE])
 178                 return -1;
 179
 180         m = malloc(sizeof(struct mount));
 181         memset(m, 0, sizeof(struct mount));
 182         m->type = TYPE_SWAP;
 183         m->uuid = blobmsg_get_strdup(tb[SWAP_UUID]);
 184         m->device = blobmsg_get_strdup(tb[SWAP_DEVICE]);
 185         if (tb[SWAP_PRIO])
 186                 m->prio = blobmsg_get_u32(tb[SWAP_PRIO]);
 187         if (m->prio)
 188                 m->prio = ((m->prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
 189
 190         if ((!tb[SWAP_ENABLE]) || blobmsg_get_u32(tb[SWAP_ENABLE]))
 191                 vlist_add(&mounts, &m->node, (m->uuid) ? (m->uuid) : (m->device));
 192
 193         return 0;
 194 }
 195
 196 static int global_add(struct uci_section *s)
 197 {
 198         struct blob_attr *tb[__CFG_MAX] = { 0 };
 199
 200         blob_buf_init(&b, 0);
 201         uci_to_blob(&b, s, &config_attr_list);
 202         blobmsg_parse(config_policy, __CFG_MAX, tb, blob_data(b.head), blob_len(b.head));
 203
 204         if ((tb[CFG_ANON_MOUNT]) && blobmsg_get_u32(tb[CFG_ANON_MOUNT]))
 205                 anon_mount = 1;
 206         if ((tb[CFG_ANON_SWAP]) && blobmsg_get_u32(tb[CFG_ANON_SWAP]))
 207                 anon_swap = 1;
 208
 209         return 0;
 210 }
 211
 212 static struct mount* find_swap(const char *uuid, const char *device)
 213 {
 214         struct mount *m;
 215
 216         vlist_for_each_element(&mounts, m, node) {
 217                 if (m->type != TYPE_SWAP)
 218                         continue;
 219                 if (uuid && m->uuid && !strcmp(m->uuid, uuid))
 220                         return m;
 221                 if (device && m->device && !strcmp(m->device, device))
 222                         return m;
 223         }
 224
 225         return NULL;
 226 }
 227
 228 static struct mount* find_block(const char *uuid, const char *label, const char *device,
 229                                 const char *target)
 230 {
 231         struct mount *m;
 232
 233         vlist_for_each_element(&mounts, m, node) {
 234                 if (m->type != TYPE_MOUNT)
 235                         continue;
 236                 if (m->uuid && uuid && !strcmp(m->uuid, uuid))
 237                         return m;
 238                 if (m->label && label && !strcmp(m->label, label))
 239                         return m;
 240                 if (m->target && target && !strcmp(m->target, target))
 241                         return m;
 242                 if (m->device && device && !strcmp(m->device, device))
 243                         return m;
 244         }
 245
 246         return NULL;
 247 }
 248
 249 static void mounts_update(struct vlist_tree *tree, struct vlist_node *node_new,
 250                           struct vlist_node *node_old)
 251 {
 252 }
 253
 254 static int config_load(char *cfg)
 255 {
 256         struct uci_context *ctx;
 257         struct uci_package *pkg;
 258         struct uci_element *e;
 259
 260         vlist_init(&mounts, avl_strcmp, mounts_update);
 261
 262         ctx = uci_alloc_context();
 263         if (cfg) {
 264                 char path[32];
 265                 snprintf(path, 32, "%s/etc/config", cfg);
 266                 uci_set_confdir(ctx, path);
 267         }
 268
 269         if (uci_load(ctx, "fstab", &pkg))
 270                 return -1;
 271
 272         vlist_update(&mounts);
 273         uci_foreach_element(&pkg->sections, e) {
 274                 struct uci_section *s = uci_to_section(e);
 275
 276                 if (!strcmp(s->type, "mount"))
 277                         mount_add(s);
 278                 if (!strcmp(s->type, "swap"))
 279                         swap_add(s);
 280                 if (!strcmp(s->type, "global"))
 281                         global_add(s);
 282         }
 283         vlist_flush(&mounts);
 284
 285         return 0;
 286 }
 287
 288 static int _cache_load(const char *path)
 289 {
 290         int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
 291         int j;
 292         glob_t gl;
 293
 294         if (glob(path, gl_flags, NULL, &gl) < 0)
 295                 return -1;
 296
 297         for (j = 0; j < gl.gl_pathc; j++) {
 298                 struct blkid_struct_probe *pr = malloc(sizeof(struct blkid_struct_probe));
 299                 memset(pr, 0, sizeof(struct blkid_struct_probe));
 300                 probe_block(gl.gl_pathv[j], pr);
 301                 if (pr->err)
 302                         free(pr);
 303                 else
 304                         list_add_tail(&pr->list, &devices);
 305         }
 306
 307         globfree(&gl);
 308
 309         return 0;
 310 }
 311
 312 static void cache_load(int mtd)
 313 {
 314         if (mtd)
 315                 _cache_load("/dev/mtdblock*");
 316         _cache_load("/dev/mmcblk*");
 317         _cache_load("/dev/sd*");
 318 }
 319
 320 static int print_block_info(struct blkid_struct_probe *pr)
 321 {
 322         printf("%s:", pr->dev);
 323         if (pr->uuid[0])
 324                 printf(" UUID=\"%s\"", pr->uuid);
 325
 326         if (pr->label[0])
 327                 printf(" LABEL=\"%s\"", pr->label);
 328
 329         if (pr->name[0])
 330                 printf(" NAME=\"%s\"", pr->name);
 331
 332         if (pr->version[0])
 333                 printf(" VERSION=\"%s\"", pr->version);
 334
 335         printf(" TYPE=\"%s\"\n", pr->id->name);
 336
 337         return 0;
 338 }
 339
 340 static int print_block_uci(struct blkid_struct_probe *pr)
 341 {
 342         if (!strcmp(pr->id->name, "swap")) {
 343                 printf("config 'swap'\n");
 344         } else {
 345                 printf("config 'mount'\n");
 346                 printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev));
 347         }
 348         if (pr->uuid[0])
 349                 printf("\toption\tuuid\t'%s'\n", pr->uuid);
 350         else
 351                 printf("\toption\tdevice\t'%s'\n", basename(pr->dev));
 352         printf("\toption\tenabled\t'0'\n\n");
 353
 354         return 0;
 355 }
 356
 357 static struct blkid_struct_probe* find_block_info(char *uuid, char *label, char *path)
 358 {
 359         struct blkid_struct_probe *pr = NULL;
 360
 361         if (uuid)
 362                 list_for_each_entry(pr, &devices, list)
 363                         if (!strcmp(pr->uuid, uuid))
 364                                 return pr;
 365
 366         if (label)
 367                 list_for_each_entry(pr, &devices, list)
 368                         if (strcmp(pr->label, label))
 369                                 return pr;
 370
 371         if (path)
 372                 list_for_each_entry(pr, &devices, list)
 373                         if (!strcmp(pr->dev, path))
 374                                 return pr;
 375
 376         return NULL;
 377 }
 378
 379 static char* find_mount_point(char *block)
 380 {
 381         FILE *fp = fopen("/proc/mounts", "r");
 382         static char line[256];
 383         int len = strlen(block);
 384         char *point = NULL;
 385
 386         if(!fp)
 387                 return NULL;
 388
 389         while (fgets(line, sizeof(line), fp)) {
 390                 if (!strncmp(line, block, len)) {
 391                         char *p = &line[len + 1];
 392                         char *t = strstr(p, " ");
 393
 394                         if (!t)
 395                                 return NULL;
 396                         *t = '\0';
 397                         point = p;
 398                         break;
 399                 }
 400         }
 401
 402         fclose(fp);
 403
 404         return point;
 405 }
 406
 407 static void mkdir_p(char *dir)
 408 {
 409         char *l = strrchr(dir, '/');
 410
 411         if (l) {
 412                 *l = '\0';
 413                 mkdir_p(dir);
 414                 *l = '/';
 415                 mkdir(dir, 0755);
 416         }
 417 }
 418
 419 static int main_hotplug(int argc, char **argv)
 420 {
 421         struct mount *m;
 422         char path[256];
 423         char *action, *device, *mount_point;
 424         struct blkid_struct_probe *pr;
 425
 426         action = getenv("ACTION");
 427         device = getenv("DEVNAME");
 428
 429         if (!action || !device)
 430                 return -1;
 431         snprintf(path, sizeof(path), "/dev/%s", device);
 432
 433         if (!strcmp(action, "remove")) {
 434                 int err = 0;
 435                 mount_point = find_mount_point(path);
 436                 if (mount_point)
 437                         err = umount2(mount_point, MNT_DETACH);
 438
 439                 if (err)
 440                         fprintf(stderr, "unmount of %s failed (%d) - %s\n",
 441                                         mount_point, err, strerror(err));
 442
 443                 return 0;
 444         } else if (strcmp(action, "add")) {
 445                 fprintf(stderr, "Unkown action %s\n", action);
 446
 447                 return -1;
 448         }
 449
 450         if (config_load(NULL))
 451                 return -1;
 452         cache_load(0);
 453
 454         pr = find_block_info(NULL, NULL, path);
 455         if (!pr) {
 456                 fprintf(stderr, "failed to read blockinfo for %s\n", path);
 457                 return -1;
 458         }
 459
 460         if (!strcmp(pr->id->name, "swap")) {
 461                 m = find_swap(pr->uuid, device);
 462                 if (m || anon_swap) {
 463                         if (!strcmp(action, "add"))
 464                                 swapon(path, (m) ? (m->prio) : (0));
 465                         else
 466                                 swapoff(path);
 467                 }
 468                 return 0;
 469         }
 470
 471         m = find_block(pr->uuid, pr->label, device, NULL);
 472         if (m && !m->extroot) {
 473                 char *target = m->target;
 474                 char _target[] = "/mnt/mmcblk123";
 475                 int err = 0;
 476
 477                 if (!target) {
 478                         snprintf(_target, sizeof(_target), "/mnt/%s", device);
 479                         target = _target;
 480                 }
 481                 mkdir_p(target);
 482                 err = mount(path, target, pr->id->name, 0, (m->options) ? (m->options) : (""));
 483                 if (err)
 484                         fprintf(stderr, "mounting %s (%s) as %s failed (%d) - %s\n",
 485                                         path, pr->id->name, target, err, strerror(err));
 486                 return err;
 487         }
 488
 489         if (anon_mount) {
 490                 char target[] = "/mnt/mmcblk123";
 491                 int err = 0;
 492
 493                 snprintf(target, sizeof(target), "/mnt/%s", device);
 494                 mkdir_p(target);
 495                 err = mount(path, target, pr->id->name, 0, "");
 496                 if (err)
 497                         fprintf(stderr, "mounting %s (%s) as %s failed (%d) - %s\n",
 498                                         path, pr->id->name, target, err, strerror(err));
 499                 return err;
 500         }
 501
 502         return 0;
 503 }
 504
 505 static int find_block_mtd(char *name, char *part, int plen)
 506 {
 507         FILE *fp = fopen("/proc/mtd", "r");
 508         static char line[256];
 509         char *index = NULL;
 510
 511         if(!fp)
 512                 return -1;
 513
 514         while (!index && fgets(line, sizeof(line), fp)) {
 515                 if (strstr(line, name)) {
 516                         char *eol = strstr(line, ":");
 517
 518                         if (!eol)
 519                                 continue;
 520
 521                         *eol = '\0';
 522                         index = &line[3];
 523                 }
 524         }
 525
 526         fclose(fp);
 527
 528         if (!index)
 529                 return -1;
 530
 531         snprintf(part, plen, "/dev/mtdblock%s", index);
 532
 533         return 0;
 534 }
 535
 536 static int check_extroot(char *path)
 537 {
 538         struct blkid_struct_probe *pr = NULL;
 539         char fs[32];
 540
 541         if (find_block_mtd("rootfs", fs, sizeof(fs)))
 542                 return -1;
 543
 544         list_for_each_entry(pr, &devices, list) {
 545                 if (!strcmp(pr->dev, fs)) {
 546                         struct stat s;
 547                         FILE *fp = NULL;
 548                         char tag[32];
 549                         char uuid[32] = { 0 };
 550
 551                         snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
 552                         if (stat(tag, &s)) {
 553                                 fp = fopen(tag, "w+");
 554                                 if (!fp) {
 555                                         fprintf(stderr, "extroot: failed to write uuid tag file\n");
 556                                         /* return 0 to continue boot regardless of error */
 557                                         return 0;
 558                                 }
 559                                 fputs(pr->uuid, fp);
 560                                 fclose(fp);
 561                                 return 0;
 562                         }
 563
 564                         fp = fopen(tag, "r");
 565                         if (!fp) {
 566                                 fprintf(stderr, "extroot: failed to open uuid tag file\n");
 567                                 return -1;
 568                         }
 569
 570                         fgets(uuid, sizeof(uuid), fp);
 571                         fclose(fp);
 572                         if (!strcmp(uuid, pr->uuid))
 573                                 return 0;
 574                         fprintf(stderr, "extroot: uuid tag does not match rom uuid\n");
 575                 }
 576         }
 577         return -1;
 578 }
 579
 580 static int mount_extroot(char *cfg)
 581 {
 582         char overlay[] = "/tmp/overlay";
 583         char mnt[] = "/tmp/mnt";
 584         char *path = mnt;
 585         struct blkid_struct_probe *pr;
 586         struct mount *m;
 587         int err = -1;
 588
 589         if (config_load(cfg))
 590                 return -2;
 591
 592         m = find_block(NULL, NULL, NULL, "/");
 593         if (!m)
 594                 m = find_block(NULL, NULL, NULL, "/overlay");
 595
 596         if (!m || !m->extroot)
 597                 return -1;
 598
 599         pr = find_block_info(m->uuid, m->label, NULL);
 600         if (pr) {
 601                 if (strncmp(pr->id->name, "ext", 3)) {
 602                         fprintf(stderr, "extroot: %s is not supported, try ext4\n", pr->id->name);
 603                         return -1;
 604                 }
 605                 if (m->overlay)
 606                         path = overlay;
 607                 mkdir_p(path);
 608
 609                 err = mount(pr->dev, path, pr->id->name, 0, (m->options) ? (m->options) : (""));
 610
 611                 if (err) {
 612                         fprintf(stderr, "mounting %s (%s) as %s failed (%d) - %s\n",
 613                                         pr->dev, pr->id->name, path, err, strerror(err));
 614                 } else if (m->overlay) {
 615                         err = check_extroot(path);
 616                         if (err)
 617                                 umount(path);
 618                 }
 619         }
 620
 621         return err;
 622 }
 623
 624 static int main_extroot(int argc, char **argv)
 625 {
 626         struct blkid_struct_probe *pr;
 627         char fs[32] = { 0 };
 628         char fs_data[32] = { 0 };
 629         int err = -1;
 630
 631         if (!getenv("PREINIT"))
 632                 return -1;
 633
 634         if (argc != 2) {
 635                 fprintf(stderr, "Usage: block extroot mountpoint\n");
 636                 return -1;
 637         }
 638
 639         mkblkdev();
 640         cache_load(1);
 641
 642         find_block_mtd("rootfs", fs, sizeof(fs));
 643         if (!fs[0])
 644                 return -2;
 645
 646         pr = find_block_info(NULL, NULL, fs);
 647         if (!pr)
 648                 return -3;
 649
 650         find_block_mtd("rootfs_data", fs_data, sizeof(fs_data));
 651         if (fs_data[0]) {
 652                 pr = find_block_info(NULL, NULL, fs_data);
 653                 if (pr && !strcmp(pr->id->name, "jffs2")) {
 654                         char cfg[] = "/tmp/jffs_cfg";
 655
 656                         mkdir_p(cfg);
 657                         if (!mount(fs_data, cfg, "jffs2", MS_NOATIME, NULL)) {
 658                                 err = mount_extroot(cfg);
 659                                 umount2(cfg, MNT_DETACH);
 660                         }
 661                         if (err < 0)
 662                                 rmdir("/tmp/overlay");
 663                         rmdir(cfg);
 664                         return err;
 665                 }
 666         }
 667
 668         return mount_extroot(NULL);
 669 }
 670
 671 static int main_detect(int argc, char **argv)
 672 {
 673         struct blkid_struct_probe *pr;
 674
 675         cache_load(0);
 676         list_for_each_entry(pr, &devices, list)
 677                 print_block_uci(pr);
 678
 679         return 0;
 680 }
 681
 682 static int main_info(int argc, char **argv)
 683 {
 684         int i;
 685         struct blkid_struct_probe *pr;
 686
 687         cache_load(1);
 688         if (argc == 2) {
 689                 list_for_each_entry(pr, &devices, list)
 690                         print_block_info(pr);
 691
 692                 return 0;
 693         };
 694
 695         for (i = 2; i < argc; i++) {
 696                 struct stat s;
 697
 698                 if (stat(argv[i], &s)) {
 699                         fprintf(stderr, "failed to stat %s\n", argv[i]);
 700                         continue;
 701                 }
 702                 if (!S_ISBLK(s.st_mode)) {
 703                         fprintf(stderr, "%s is not a block device\n", argv[i]);
 704                         continue;
 705                 }
 706                 pr = find_block_info(NULL, NULL, argv[i]);
 707                 if (pr)
 708                         print_block_info(pr);
 709         }
 710
 711         return 0;
 712 }
 713
 714 static int main_swapon(int argc, char **argv)
 715 {
 716         if (argc != 2) {
 717                 fprintf(stderr, "Usage: swapoff [-a] [DEVICE]\n\nStop swapping on DEVICE\n\n\t-a      Stop swapping on all swap devices\n");
 718                 return -1;
 719         }
 720
 721         if (!strcmp(argv[1], "-a")) {
 722                 struct blkid_struct_probe *pr;
 723
 724                 cache_load(0);
 725                 list_for_each_entry(pr, &devices, list) {
 726                         if (strcmp(pr->id->name, "swap"))
 727                                 continue;
 728                         if (swapon(pr->dev, 0))
 729                                 fprintf(stderr, "failed to swapon %s\n", pr->dev);
 730                 }
 731         } else {
 732                 struct stat s;
 733                 int err;
 734
 735                 if (stat(argv[1], &s) || !S_ISBLK(s.st_mode)) {
 736                         fprintf(stderr, "%s is not a block device\n", argv[1]);
 737                         return -1;
 738                 }
 739                 err = swapon(argv[1], 0);
 740                 if (err) {
 741                         fprintf(stderr, "failed to swapon %s (%d)\n", argv[1], err);
 742                         return err;
 743                 }
 744         }
 745
 746         return 0;
 747 }
 748
 749 static int main_swapoff(int argc, char **argv)
 750 {
 751         if (argc != 2) {
 752                 fprintf(stderr, "Usage: swapoff [-a] [DEVICE]\n\nStop swapping on DEVICE\n\n\t-a      Stop swapping on all swap devices\n");
 753                 return -1;
 754         }
 755
 756         if (!strcmp(argv[1], "-a")) {
 757                 FILE *fp = fopen("/proc/swaps", "r");
 758                 char line[256];
 759
 760                 if (!fp) {
 761                         fprintf(stderr, "failed to open /proc/swaps\n");
 762                         return -1;
 763                 }
 764                 fgets(line, sizeof(line), fp);
 765                 while (fgets(line, sizeof(line), fp)) {
 766                         char *end = strchr(line, ' ');
 767                         int err;
 768
 769                         if (!end)
 770                                 continue;
 771                         *end = '\0';
 772                         err = swapoff(line);
 773                         if (err)
 774                                 fprintf(stderr, "failed to swapoff %s (%d)\n", line, err);
 775                 }
 776                 fclose(fp);
 777         } else {
 778                 struct stat s;
 779                 int err;
 780
 781                 if (stat(argv[1], &s) || !S_ISBLK(s.st_mode)) {
 782                         fprintf(stderr, "%s is not a block device\n", argv[1]);
 783                         return -1;
 784                 }
 785                 err = swapoff(argv[1]);
 786                 if (err) {
 787                         fprintf(stderr, "fsiled to swapoff %s (%d)\n", argv[1], err);
 788                         return err;
 789                 }
 790         }
 791
 792         return 0;
 793 }
 794
 795 int main(int argc, char **argv)
 796 {
 797         char *base = basename(*argv);
 798
 799         umask(0);
 800
 801         if (!strcmp(base, "swapon"))
 802                 return main_swapon(argc, argv);
 803
 804         if (!strcmp(base, "swapoff"))
 805                 return main_swapoff(argc, argv);
 806
 807         if ((argc > 1) && !strcmp(base, "block")) {
 808                 if (!strcmp(argv[1], "info"))
 809                         return main_info(argc, argv);
 810
 811                 if (!strcmp(argv[1], "detect"))
 812                         return main_detect(argc, argv);
 813
 814                 if (!strcmp(argv[1], "hotplug"))
 815                         return main_hotplug(argc, argv);
 816
 817                 if (!strcmp(argv[1], "extroot"))
 818                         return main_extroot(argc, argv);
 819         }
 820
 821         fprintf(stderr, "Usage: block <info|detect>\n");
 822
 823         return -1;
 824 }