cmds-device.c

   1 /*
   2  * This program is free software; you can redistribute it and/or
   3  * modify it under the terms of the GNU General Public
   4  * License v2 as published by the Free Software Foundation.
   5  *
   6  * This program is distributed in the hope that it will be useful,
   7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   9  * General Public License for more details.
  10  *
  11  * You should have received a copy of the GNU General Public
  12  * License along with this program; if not, write to the
  13  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  14  * Boston, MA 021110-1307, USA.
  15  */
  16
  17 #include <stdio.h>
  18 #include <stdlib.h>
  19 #include <string.h>
  20 #include <unistd.h>
  21 #include <fcntl.h>
  22 #include <sys/ioctl.h>
  23 #include <errno.h>
  24 #include <sys/stat.h>
  25 #include <getopt.h>
  26
  27 #include "kerncompat.h"
  28 #include "ctree.h"
  29 #include "ioctl.h"
  30 #include "utils.h"
  31 #include "volumes.h"
  32 #include "cmds-fi-usage.h"
  33
  34 #include "commands.h"
  35
  36 static const char * const device_cmd_group_usage[] = {
  37         "btrfs device <command> [<args>]",
  38         NULL
  39 };
  40
  41 static const char * const cmd_device_add_usage[] = {
  42         "btrfs device add [options] <device> [<device>...] <path>",
  43         "Add a device to a filesystem",
  44         "-K|--nodiscard    do not perform whole device TRIM",
  45         "-f|--force        force overwrite existing filesystem on the disk",
  46         NULL
  47 };
  48
  49 static int cmd_device_add(int argc, char **argv)
  50 {
  51         char    *mntpnt;
  52         int i, fdmnt, ret = 0;
  53         DIR     *dirstream = NULL;
  54         int discard = 1;
  55         int force = 0;
  56         int last_dev;
  57
  58         while (1) {
  59                 int c;
  60                 static const struct option long_options[] = {
  61                         { "nodiscard", optional_argument, NULL, 'K'},
  62                         { "force", no_argument, NULL, 'f'},
  63                         { NULL, 0, NULL, 0}
  64                 };
  65
  66                 c = getopt_long(argc, argv, "Kf", long_options, NULL);
  67                 if (c < 0)
  68                         break;
  69                 switch (c) {
  70                 case 'K':
  71                         discard = 0;
  72                         break;
  73                 case 'f':
  74                         force = 1;
  75                         break;
  76                 default:
  77                         usage(cmd_device_add_usage);
  78                 }
  79         }
  80
  81         if (check_argc_min(argc - optind, 2))
  82                 usage(cmd_device_add_usage);
  83
  84         last_dev = argc - 1;
  85         mntpnt = argv[last_dev];
  86
  87         fdmnt = btrfs_open_dir(mntpnt, &dirstream, 1);
  88         if (fdmnt < 0)
  89                 return 1;
  90
  91         for (i = optind; i < last_dev; i++){
  92                 struct btrfs_ioctl_vol_args ioctl_args;
  93                 int     devfd, res;
  94                 u64 dev_block_count = 0;
  95                 char *path;
  96
  97                 res = test_dev_for_mkfs(argv[i], force);
  98                 if (res) {
  99                         ret++;
 100                         continue;
 101                 }
 102
 103                 devfd = open(argv[i], O_RDWR);
 104                 if (devfd < 0) {
 105                         error("unable to open device '%s'", argv[i]);
 106                         ret++;
 107                         continue;
 108                 }
 109
 110                 res = btrfs_prepare_device(devfd, argv[i], 1, &dev_block_count,
 111                                            0, discard);
 112                 close(devfd);
 113                 if (res) {
 114                         ret++;
 115                         goto error_out;
 116                 }
 117
 118                 path = canonicalize_path(argv[i]);
 119                 if (!path) {
 120                         error("could not canonicalize pathname '%s': %s",
 121                                 argv[i], strerror(errno));
 122                         ret++;
 123                         goto error_out;
 124                 }
 125
 126                 memset(&ioctl_args, 0, sizeof(ioctl_args));
 127                 strncpy_null(ioctl_args.name, path);
 128                 res = ioctl(fdmnt, BTRFS_IOC_ADD_DEV, &ioctl_args);
 129                 if (res < 0) {
 130                         error("error adding device '%s': %s",
 131                                 path, strerror(errno));
 132                         ret++;
 133                 }
 134                 free(path);
 135         }
 136
 137 error_out:
 138         close_file_or_dir(fdmnt, dirstream);
 139         return !!ret;
 140 }
 141
 142 static int _cmd_device_remove(int argc, char **argv,
 143                 const char * const *usagestr)
 144 {
 145         char    *mntpnt;
 146         int i, fdmnt, ret = 0;
 147         DIR     *dirstream = NULL;
 148
 149         clean_args_no_options(argc, argv, usagestr);
 150
 151         if (check_argc_min(argc - optind, 2))
 152                 usage(usagestr);
 153
 154         mntpnt = argv[argc - 1];
 155
 156         fdmnt = btrfs_open_dir(mntpnt, &dirstream, 1);
 157         if (fdmnt < 0)
 158                 return 1;
 159
 160         for(i = optind; i < argc - 1; i++) {
 161                 struct  btrfs_ioctl_vol_args arg;
 162                 struct btrfs_ioctl_vol_args_v2 argv2 = {0};
 163                 int is_devid = 0;
 164                 int     res;
 165
 166                 if (string_is_numerical(argv[i])) {
 167                         argv2.devid = arg_strtou64(argv[i]);
 168                         argv2.flags = BTRFS_DEVICE_SPEC_BY_ID;
 169                         is_devid = 1;
 170                 } else if (is_block_device(argv[i]) == 1 ||
 171                                 strcmp(argv[i], "missing") == 0) {
 172                         strncpy_null(argv2.name, argv[i]);
 173                 } else {
 174                         error("not a block device: %s", argv[i]);
 175                         ret++;
 176                         continue;
 177                 }
 178
 179                 /*
 180                  * Positive values are from BTRFS_ERROR_DEV_*,
 181                  * otherwise it's a generic error, one of errnos
 182                  */
 183                 res = ioctl(fdmnt, BTRFS_IOC_RM_DEV_V2, &argv2);
 184
 185                 /*
 186                  * If BTRFS_IOC_RM_DEV_V2 is not supported we get ENOTTY and if
 187                  * argv2.flags includes a flag which kernel doesn't understand then
 188                  * we shall get EOPNOTSUPP
 189                  */
 190                 if (res < 0 && (errno == ENOTTY || errno == EOPNOTSUPP)) {
 191                         if (is_devid) {
 192                                 error("device delete by id failed: %s",
 193                                                         strerror(errno));
 194                                 ret++;
 195                                 continue;
 196                         }
 197                         memset(&arg, 0, sizeof(arg));
 198                         strncpy_null(arg.name, argv[i]);
 199                         res = ioctl(fdmnt, BTRFS_IOC_RM_DEV, &arg);
 200                 }
 201
 202                 if (res) {
 203                         const char *msg;
 204
 205                         if (res > 0)
 206                                 msg = btrfs_err_str(res);
 207                         else
 208                                 msg = strerror(errno);
 209                         if (is_devid) {
 210                                 error("error removing devid %llu: %s",
 211                                         (unsigned long long)argv2.devid, msg);
 212                         } else {
 213                                 error("error removing device '%s': %s",
 214                                         argv[i], msg);
 215                         }
 216                         ret++;
 217                 }
 218         }
 219
 220         close_file_or_dir(fdmnt, dirstream);
 221         return !!ret;
 222 }
 223
 224 static const char * const cmd_device_remove_usage[] = {
 225         "btrfs device remove <device>|<devid> [<device>|<devid>...] <path>",
 226         "Remove a device from a filesystem",
 227         NULL
 228 };
 229
 230 static int cmd_device_remove(int argc, char **argv)
 231 {
 232         return _cmd_device_remove(argc, argv, cmd_device_remove_usage);
 233 }
 234
 235 static const char * const cmd_device_delete_usage[] = {
 236         "btrfs device delete <device>|<devid> [<device>|<devid>...] <path>",
 237         "Remove a device from a filesystem",
 238         NULL
 239 };
 240
 241 static int cmd_device_delete(int argc, char **argv)
 242 {
 243         return _cmd_device_remove(argc, argv, cmd_device_delete_usage);
 244 }
 245
 246 static const char * const cmd_device_scan_usage[] = {
 247         "btrfs device scan [(-d|--all-devices)|<device> [<device>...]]",
 248         "Scan devices for a btrfs filesystem",
 249         " -d|--all-devices (deprecated)",
 250         NULL
 251 };
 252
 253 static int cmd_device_scan(int argc, char **argv)
 254 {
 255         int i;
 256         int devstart;
 257         int all = 0;
 258         int ret = 0;
 259
 260         optind = 1;
 261         while (1) {
 262                 int c;
 263                 static const struct option long_options[] = {
 264                         { "all-devices", no_argument, NULL, 'd'},
 265                         { NULL, 0, NULL, 0}
 266                 };
 267
 268                 c = getopt_long(argc, argv, "d", long_options, NULL);
 269                 if (c < 0)
 270                         break;
 271                 switch (c) {
 272                 case 'd':
 273                         all = 1;
 274                         break;
 275                 default:
 276                         usage(cmd_device_scan_usage);
 277                 }
 278         }
 279         devstart = optind;
 280
 281         if (all && check_argc_max(argc - optind, 1))
 282                 usage(cmd_device_scan_usage);
 283
 284         if (all || argc - optind == 0) {
 285                 printf("Scanning for Btrfs filesystems\n");
 286                 ret = btrfs_scan_lblkid();
 287                 error_on(ret, "error %d while scanning", ret);
 288                 ret = btrfs_register_all_devices();
 289                 error_on(ret, "there are %d errors while registering devices", ret);
 290                 goto out;
 291         }
 292
 293         for( i = devstart ; i < argc ; i++ ){
 294                 char *path;
 295
 296                 if (is_block_device(argv[i]) != 1) {
 297                         error("not a block device: %s", argv[i]);
 298                         ret = 1;
 299                         goto out;
 300                 }
 301                 path = canonicalize_path(argv[i]);
 302                 if (!path) {
 303                         error("could not canonicalize path '%s': %s",
 304                                 argv[i], strerror(errno));
 305                         ret = 1;
 306                         goto out;
 307                 }
 308                 printf("Scanning for Btrfs filesystems in '%s'\n", path);
 309                 if (btrfs_register_one_device(path) != 0) {
 310                         ret = 1;
 311                         free(path);
 312                         goto out;
 313                 }
 314                 free(path);
 315         }
 316
 317 out:
 318         return !!ret;
 319 }
 320
 321 static const char * const cmd_device_ready_usage[] = {
 322         "btrfs device ready <device>",
 323         "Check device to see if it has all of its devices in cache for mounting",
 324         NULL
 325 };
 326
 327 static int cmd_device_ready(int argc, char **argv)
 328 {
 329         struct  btrfs_ioctl_vol_args args;
 330         int     fd;
 331         int     ret;
 332         char    *path;
 333
 334         clean_args_no_options(argc, argv, cmd_device_ready_usage);
 335
 336         if (check_argc_exact(argc - optind, 1))
 337                 usage(cmd_device_ready_usage);
 338
 339         fd = open("/dev/btrfs-control", O_RDWR);
 340         if (fd < 0) {
 341                 perror("failed to open /dev/btrfs-control");
 342                 return 1;
 343         }
 344
 345         path = canonicalize_path(argv[optind]);
 346         if (!path) {
 347                 error("could not canonicalize pathname '%s': %s",
 348                         argv[optind], strerror(errno));
 349                 ret = 1;
 350                 goto out;
 351         }
 352
 353         if (is_block_device(path) != 1) {
 354                 error("not a block device: %s", path);
 355                 ret = 1;
 356                 goto out;
 357         }
 358
 359         memset(&args, 0, sizeof(args));
 360         strncpy_null(args.name, path);
 361         ret = ioctl(fd, BTRFS_IOC_DEVICES_READY, &args);
 362         if (ret < 0) {
 363                 error("unable to determine if device '%s' is ready for mount: %s",
 364                         path, strerror(errno));
 365                 ret = 1;
 366         }
 367
 368 out:
 369         free(path);
 370         close(fd);
 371         return ret;
 372 }
 373
 374 static const char * const cmd_device_stats_usage[] = {
 375         "btrfs device stats [-z] <path>|<device>",
 376         "Show current device IO stats.",
 377         "",
 378         "-z                     show current stats and reset values to zero",
 379         NULL
 380 };
 381
 382 static int cmd_device_stats(int argc, char **argv)
 383 {
 384         char *dev_path;
 385         struct btrfs_ioctl_fs_info_args fi_args;
 386         struct btrfs_ioctl_dev_info_args *di_args = NULL;
 387         int ret;
 388         int fdmnt;
 389         int i;
 390         int c;
 391         int err = 0;
 392         __u64 flags = 0;
 393         DIR *dirstream = NULL;
 394
 395         optind = 1;
 396         while ((c = getopt(argc, argv, "z")) != -1) {
 397                 switch (c) {
 398                 case 'z':
 399                         flags = BTRFS_DEV_STATS_RESET;
 400                         break;
 401                 case '?':
 402                 default:
 403                         usage(cmd_device_stats_usage);
 404                 }
 405         }
 406
 407         if (check_argc_exact(argc - optind, 1))
 408                 usage(cmd_device_stats_usage);
 409
 410         dev_path = argv[optind];
 411
 412         fdmnt = open_path_or_dev_mnt(dev_path, &dirstream, 1);
 413         if (fdmnt < 0)
 414                 return 1;
 415
 416         ret = get_fs_info(dev_path, &fi_args, &di_args);
 417         if (ret) {
 418                 error("getting dev info for devstats failed: %s",
 419                         strerror(-ret));
 420                 err = 1;
 421                 goto out;
 422         }
 423         if (!fi_args.num_devices) {
 424                 error("no devices found");
 425                 err = 1;
 426                 goto out;
 427         }
 428
 429         for (i = 0; i < fi_args.num_devices; i++) {
 430                 struct btrfs_ioctl_get_dev_stats args = {0};
 431                 __u8 path[BTRFS_DEVICE_PATH_NAME_MAX + 1];
 432
 433                 strncpy((char *)path, (char *)di_args[i].path,
 434                         BTRFS_DEVICE_PATH_NAME_MAX);
 435                 path[BTRFS_DEVICE_PATH_NAME_MAX] = '\0';
 436
 437                 args.devid = di_args[i].devid;
 438                 args.nr_items = BTRFS_DEV_STAT_VALUES_MAX;
 439                 args.flags = flags;
 440
 441                 if (ioctl(fdmnt, BTRFS_IOC_GET_DEV_STATS, &args) < 0) {
 442                         error("DEV_STATS ioctl failed on %s: %s",
 443                               path, strerror(errno));
 444                         err = 1;
 445                 } else {
 446                         char *canonical_path;
 447
 448                         canonical_path = canonicalize_path((char *)path);
 449
 450                         /* No path when device is missing. */
 451                         if (!canonical_path) {
 452                                 canonical_path = malloc(32);
 453                                 if (!canonical_path) {
 454                                         error("not enough memory for path buffer");
 455                                         goto out;
 456                                 }
 457                                 snprintf(canonical_path, 32,
 458                                          "devid:%llu", args.devid);
 459                         }
 460
 461                         if (args.nr_items >= BTRFS_DEV_STAT_WRITE_ERRS + 1)
 462                                 printf("[%s].write_io_errs   %llu\n",
 463                                        canonical_path,
 464                                        (unsigned long long) args.values[
 465                                         BTRFS_DEV_STAT_WRITE_ERRS]);
 466                         if (args.nr_items >= BTRFS_DEV_STAT_READ_ERRS + 1)
 467                                 printf("[%s].read_io_errs    %llu\n",
 468                                        canonical_path,
 469                                        (unsigned long long) args.values[
 470                                         BTRFS_DEV_STAT_READ_ERRS]);
 471                         if (args.nr_items >= BTRFS_DEV_STAT_FLUSH_ERRS + 1)
 472                                 printf("[%s].flush_io_errs   %llu\n",
 473                                        canonical_path,
 474                                        (unsigned long long) args.values[
 475                                         BTRFS_DEV_STAT_FLUSH_ERRS]);
 476                         if (args.nr_items >= BTRFS_DEV_STAT_CORRUPTION_ERRS + 1)
 477                                 printf("[%s].corruption_errs %llu\n",
 478                                        canonical_path,
 479                                        (unsigned long long) args.values[
 480                                         BTRFS_DEV_STAT_CORRUPTION_ERRS]);
 481                         if (args.nr_items >= BTRFS_DEV_STAT_GENERATION_ERRS + 1)
 482                                 printf("[%s].generation_errs %llu\n",
 483                                        canonical_path,
 484                                        (unsigned long long) args.values[
 485                                         BTRFS_DEV_STAT_GENERATION_ERRS]);
 486
 487                         free(canonical_path);
 488                 }
 489         }
 490
 491 out:
 492         free(di_args);
 493         close_file_or_dir(fdmnt, dirstream);
 494
 495         return err;
 496 }
 497
 498 static const char * const cmd_device_usage_usage[] = {
 499         "btrfs device usage [options] <path> [<path>..]",
 500         "Show detailed information about internal allocations in devices.",
 501         HELPINFO_UNITS_SHORT_LONG,
 502         NULL
 503 };
 504
 505 static int _cmd_device_usage(int fd, char *path, unsigned unit_mode)
 506 {
 507         int i;
 508         int ret = 0;
 509         struct chunk_info *chunkinfo = NULL;
 510         struct device_info *devinfo = NULL;
 511         int chunkcount = 0;
 512         int devcount = 0;
 513
 514         ret = load_chunk_and_device_info(fd, &chunkinfo, &chunkcount, &devinfo,
 515                         &devcount);
 516         if (ret)
 517                 goto out;
 518
 519         for (i = 0; i < devcount; i++) {
 520                 printf("%s, ID: %llu\n", devinfo[i].path, devinfo[i].devid);
 521                 print_device_sizes(fd, &devinfo[i], unit_mode);
 522                 print_device_chunks(fd, &devinfo[i], chunkinfo, chunkcount,
 523                                 unit_mode);
 524                 printf("\n");
 525         }
 526
 527 out:
 528         free(devinfo);
 529         free(chunkinfo);
 530
 531         return ret;
 532 }
 533
 534 static int cmd_device_usage(int argc, char **argv)
 535 {
 536         unsigned unit_mode;
 537         int ret = 0;
 538         int i;
 539
 540         unit_mode = get_unit_mode_from_arg(&argc, argv, 1);
 541
 542         clean_args_no_options(argc, argv, cmd_device_usage_usage);
 543
 544         if (check_argc_min(argc - optind, 1))
 545                 usage(cmd_device_usage_usage);
 546
 547         for (i = optind; i < argc; i++) {
 548                 int fd;
 549                 DIR *dirstream = NULL;
 550
 551                 if (i > 1)
 552                         printf("\n");
 553
 554                 fd = btrfs_open_dir(argv[i], &dirstream, 1);
 555                 if (fd < 0) {
 556                         ret = 1;
 557                         break;
 558                 }
 559
 560                 ret = _cmd_device_usage(fd, argv[i], unit_mode);
 561                 close_file_or_dir(fd, dirstream);
 562
 563                 if (ret)
 564                         break;
 565         }
 566
 567         return !!ret;
 568 }
 569
 570 static const char device_cmd_group_info[] =
 571 "manage and query devices in the filesystem";
 572
 573 const struct cmd_group device_cmd_group = {
 574         device_cmd_group_usage, device_cmd_group_info, {
 575                 { "add", cmd_device_add, cmd_device_add_usage, NULL, 0 },
 576                 { "delete", cmd_device_delete, cmd_device_delete_usage, NULL,
 577                         CMD_ALIAS },
 578                 { "remove", cmd_device_remove, cmd_device_remove_usage, NULL, 0 },
 579                 { "scan", cmd_device_scan, cmd_device_scan_usage, NULL, 0 },
 580                 { "ready", cmd_device_ready, cmd_device_ready_usage, NULL, 0 },
 581                 { "stats", cmd_device_stats, cmd_device_stats_usage, NULL, 0 },
 582                 { "usage", cmd_device_usage,
 583                         cmd_device_usage_usage, NULL, 0 },
 584                 NULL_CMD_STRUCT
 585         }
 586 };
 587
 588 int cmd_device(int argc, char **argv)
 589 {
 590         return handle_command_group(&device_cmd_group, argc, argv);
 591 }