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, e;
  53         DIR     *dirstream = NULL;
  54         int discard = 1;
  55         int force = 0;
  56
  57         while (1) {
  58                 int c;
  59                 static const struct option long_options[] = {
  60                         { "nodiscard", optional_argument, NULL, 'K'},
  61                         { "force", no_argument, NULL, 'f'},
  62                         { NULL, 0, NULL, 0}
  63                 };
  64
  65                 c = getopt_long(argc, argv, "Kf", long_options, NULL);
  66                 if (c < 0)
  67                         break;
  68                 switch (c) {
  69                 case 'K':
  70                         discard = 0;
  71                         break;
  72                 case 'f':
  73                         force = 1;
  74                         break;
  75                 default:
  76                         usage(cmd_device_add_usage);
  77                 }
  78         }
  79
  80         argc = argc - optind;
  81
  82         if (check_argc_min(argc, 2))
  83                 usage(cmd_device_add_usage);
  84
  85         mntpnt = argv[optind + argc - 1];
  86
  87         fdmnt = btrfs_open_dir(mntpnt, &dirstream, 1);
  88         if (fdmnt < 0)
  89                 return 1;
  90
  91         for (i = optind; i < optind + argc - 1; i++){
  92                 struct btrfs_ioctl_vol_args ioctl_args;
  93                 int     devfd, res;
  94                 u64 dev_block_count = 0;
  95                 int mixed = 0;
  96                 char *path;
  97
  98                 res = test_dev_for_mkfs(argv[i], force);
  99                 if (res) {
 100                         ret++;
 101                         continue;
 102                 }
 103
 104                 devfd = open(argv[i], O_RDWR);
 105                 if (devfd < 0) {
 106                         fprintf(stderr, "ERROR: Unable to open device '%s'\n", argv[i]);
 107                         ret++;
 108                         continue;
 109                 }
 110
 111                 res = btrfs_prepare_device(devfd, argv[i], 1, &dev_block_count,
 112                                            0, &mixed, discard);
 113                 close(devfd);
 114                 if (res) {
 115                         ret++;
 116                         goto error_out;
 117                 }
 118
 119                 path = canonicalize_path(argv[i]);
 120                 if (!path) {
 121                         fprintf(stderr,
 122                                 "ERROR: Could not canonicalize pathname '%s': %s\n",
 123                                 argv[i], strerror(errno));
 124                         ret++;
 125                         goto error_out;
 126                 }
 127
 128                 memset(&ioctl_args, 0, sizeof(ioctl_args));
 129                 strncpy_null(ioctl_args.name, path);
 130                 res = ioctl(fdmnt, BTRFS_IOC_ADD_DEV, &ioctl_args);
 131                 e = errno;
 132                 if (res < 0) {
 133                         fprintf(stderr, "ERROR: error adding the device '%s' - %s\n",
 134                                 path, strerror(e));
 135                         ret++;
 136                 }
 137                 free(path);
 138         }
 139
 140 error_out:
 141         close_file_or_dir(fdmnt, dirstream);
 142         btrfs_close_all_devices();
 143         return !!ret;
 144 }
 145
 146 static int _cmd_device_remove(int argc, char **argv,
 147                 const char * const *usagestr)
 148 {
 149         char    *mntpnt;
 150         int     i, fdmnt, ret=0, e;
 151         DIR     *dirstream = NULL;
 152
 153         if (check_argc_min(argc, 3))
 154                 usage(usagestr);
 155
 156         mntpnt = argv[argc - 1];
 157
 158         fdmnt = btrfs_open_dir(mntpnt, &dirstream, 1);
 159         if (fdmnt < 0)
 160                 return 1;
 161
 162         for(i=1 ; i < argc - 1; i++ ){
 163                 struct  btrfs_ioctl_vol_args arg;
 164                 int     res;
 165
 166                 if (is_block_device(argv[i]) != 1) {
 167                         fprintf(stderr,
 168                                 "ERROR: %s is not a block device\n", argv[i]);
 169                         ret++;
 170                         continue;
 171                 }
 172                 memset(&arg, 0, sizeof(arg));
 173                 strncpy_null(arg.name, argv[i]);
 174                 res = ioctl(fdmnt, BTRFS_IOC_RM_DEV, &arg);
 175                 e = errno;
 176                 if (res) {
 177                         const char *msg;
 178
 179                         if (res > 0)
 180                                 msg = btrfs_err_str(res);
 181                         else
 182                                 msg = strerror(e);
 183                         fprintf(stderr,
 184                                 "ERROR: error removing the device '%s' - %s\n",
 185                                 argv[i], msg);
 186                         ret++;
 187                 }
 188         }
 189
 190         close_file_or_dir(fdmnt, dirstream);
 191         return !!ret;
 192 }
 193
 194 static const char * const cmd_device_remove_usage[] = {
 195         "btrfs device remove <device> [<device>...] <path>",
 196         "Remove a device from a filesystem",
 197         NULL
 198 };
 199
 200 static int cmd_device_remove(int argc, char **argv)
 201 {
 202         return _cmd_device_remove(argc, argv, cmd_device_remove_usage);
 203 }
 204
 205 static const char * const cmd_device_delete_usage[] = {
 206         "btrfs device delete <device> [<device>...] <path>",
 207         "Remove a device from a filesystem",
 208         NULL
 209 };
 210
 211 static int cmd_device_delete(int argc, char **argv)
 212 {
 213         return _cmd_device_remove(argc, argv, cmd_device_delete_usage);
 214 }
 215
 216 static const char * const cmd_device_scan_usage[] = {
 217         "btrfs device scan [(-d|--all-devices)|<device> [<device>...]]",
 218         "Scan devices for a btrfs filesystem",
 219         " -d|--all-devices (deprecated)",
 220         NULL
 221 };
 222
 223 static int cmd_device_scan(int argc, char **argv)
 224 {
 225         int i;
 226         int devstart = 1;
 227         int all = 0;
 228         int ret = 0;
 229
 230         optind = 1;
 231         while (1) {
 232                 int c;
 233                 static const struct option long_options[] = {
 234                         { "all-devices", no_argument, NULL, 'd'},
 235                         { NULL, 0, NULL, 0}
 236                 };
 237
 238                 c = getopt_long(argc, argv, "d", long_options, NULL);
 239                 if (c < 0)
 240                         break;
 241                 switch (c) {
 242                 case 'd':
 243                         all = 1;
 244                         break;
 245                 default:
 246                         usage(cmd_device_scan_usage);
 247                 }
 248         }
 249
 250         if (all && check_argc_max(argc, 2))
 251                 usage(cmd_device_scan_usage);
 252
 253         if (all || argc == 1) {
 254                 printf("Scanning for Btrfs filesystems\n");
 255                 ret = btrfs_scan_lblkid();
 256                 if (ret)
 257                         fprintf(stderr, "ERROR: error %d while scanning\n", ret);
 258                 ret = btrfs_register_all_devices();
 259                 if (ret)
 260                         fprintf(stderr, "ERROR: error %d while registering\n", ret);
 261                 goto out;
 262         }
 263
 264         for( i = devstart ; i < argc ; i++ ){
 265                 char *path;
 266
 267                 if (is_block_device(argv[i]) != 1) {
 268                         fprintf(stderr,
 269                                 "ERROR: %s is not a block device\n", argv[i]);
 270                         ret = 1;
 271                         goto out;
 272                 }
 273                 path = canonicalize_path(argv[i]);
 274                 if (!path) {
 275                         fprintf(stderr,
 276                                 "ERROR: Could not canonicalize path '%s': %s\n",
 277                                 argv[i], strerror(errno));
 278                         ret = 1;
 279                         goto out;
 280                 }
 281                 printf("Scanning for Btrfs filesystems in '%s'\n", path);
 282                 if (btrfs_register_one_device(path) != 0) {
 283                         ret = 1;
 284                         free(path);
 285                         goto out;
 286                 }
 287                 free(path);
 288         }
 289
 290 out:
 291         btrfs_close_all_devices();
 292         return !!ret;
 293 }
 294
 295 static const char * const cmd_device_ready_usage[] = {
 296         "btrfs device ready <device>",
 297         "Check device to see if it has all of its devices in cache for mounting",
 298         NULL
 299 };
 300
 301 static int cmd_device_ready(int argc, char **argv)
 302 {
 303         struct  btrfs_ioctl_vol_args args;
 304         int     fd;
 305         int     ret;
 306         char    *path;
 307
 308         if (check_argc_min(argc, 2))
 309                 usage(cmd_device_ready_usage);
 310
 311         fd = open("/dev/btrfs-control", O_RDWR);
 312         if (fd < 0) {
 313                 perror("failed to open /dev/btrfs-control");
 314                 return 1;
 315         }
 316
 317         path = canonicalize_path(argv[argc - 1]);
 318         if (!path) {
 319                 fprintf(stderr,
 320                         "ERROR: Could not canonicalize pathname '%s': %s\n",
 321                         argv[argc - 1], strerror(errno));
 322                 ret = 1;
 323                 goto out;
 324         }
 325
 326         if (is_block_device(path) != 1) {
 327                 fprintf(stderr,
 328                         "ERROR: %s is not a block device\n", path);
 329                 ret = 1;
 330                 goto out;
 331         }
 332
 333         memset(&args, 0, sizeof(args));
 334         strncpy_null(args.name, path);
 335         ret = ioctl(fd, BTRFS_IOC_DEVICES_READY, &args);
 336         if (ret < 0) {
 337                 fprintf(stderr, "ERROR: unable to determine if the device '%s'"
 338                         " is ready for mounting - %s\n", path,
 339                         strerror(errno));
 340                 ret = 1;
 341         }
 342
 343 out:
 344         free(path);
 345         close(fd);
 346         return ret;
 347 }
 348
 349 static const char * const cmd_device_stats_usage[] = {
 350         "btrfs device stats [-z] <path>|<device>",
 351         "Show current device IO stats.",
 352         "",
 353         "-z                     show current stats and reset values to zero",
 354         NULL
 355 };
 356
 357 static int cmd_device_stats(int argc, char **argv)
 358 {
 359         char *dev_path;
 360         struct btrfs_ioctl_fs_info_args fi_args;
 361         struct btrfs_ioctl_dev_info_args *di_args = NULL;
 362         int ret;
 363         int fdmnt;
 364         int i;
 365         int c;
 366         int err = 0;
 367         __u64 flags = 0;
 368         DIR *dirstream = NULL;
 369
 370         optind = 1;
 371         while ((c = getopt(argc, argv, "z")) != -1) {
 372                 switch (c) {
 373                 case 'z':
 374                         flags = BTRFS_DEV_STATS_RESET;
 375                         break;
 376                 case '?':
 377                 default:
 378                         usage(cmd_device_stats_usage);
 379                 }
 380         }
 381
 382         argc = argc - optind;
 383         if (check_argc_exact(argc, 1))
 384                 usage(cmd_device_stats_usage);
 385
 386         dev_path = argv[optind];
 387
 388         fdmnt = open_path_or_dev_mnt(dev_path, &dirstream);
 389
 390         if (fdmnt < 0) {
 391                 if (errno == EINVAL)
 392                         fprintf(stderr,
 393                                 "ERROR: '%s' is not a mounted btrfs device\n",
 394                                 dev_path);
 395                 else
 396                         fprintf(stderr, "ERROR: can't access '%s': %s\n",
 397                                 dev_path, strerror(errno));
 398                 return 1;
 399         }
 400
 401         ret = get_fs_info(dev_path, &fi_args, &di_args);
 402         if (ret) {
 403                 fprintf(stderr, "ERROR: getting dev info for devstats failed: "
 404                                 "%s\n", strerror(-ret));
 405                 err = 1;
 406                 goto out;
 407         }
 408         if (!fi_args.num_devices) {
 409                 fprintf(stderr, "ERROR: no devices found\n");
 410                 err = 1;
 411                 goto out;
 412         }
 413
 414         for (i = 0; i < fi_args.num_devices; i++) {
 415                 struct btrfs_ioctl_get_dev_stats args = {0};
 416                 __u8 path[BTRFS_DEVICE_PATH_NAME_MAX + 1];
 417
 418                 strncpy((char *)path, (char *)di_args[i].path,
 419                         BTRFS_DEVICE_PATH_NAME_MAX);
 420                 path[BTRFS_DEVICE_PATH_NAME_MAX] = '\0';
 421
 422                 args.devid = di_args[i].devid;
 423                 args.nr_items = BTRFS_DEV_STAT_VALUES_MAX;
 424                 args.flags = flags;
 425
 426                 if (ioctl(fdmnt, BTRFS_IOC_GET_DEV_STATS, &args) < 0) {
 427                         fprintf(stderr,
 428                                 "ERROR: ioctl(BTRFS_IOC_GET_DEV_STATS) on %s failed: %s\n",
 429                                 path, strerror(errno));
 430                         err = 1;
 431                 } else {
 432                         char *canonical_path;
 433
 434                         canonical_path = canonicalize_path((char *)path);
 435
 436                         if (args.nr_items >= BTRFS_DEV_STAT_WRITE_ERRS + 1)
 437                                 printf("[%s].write_io_errs   %llu\n",
 438                                        canonical_path,
 439                                        (unsigned long long) args.values[
 440                                         BTRFS_DEV_STAT_WRITE_ERRS]);
 441                         if (args.nr_items >= BTRFS_DEV_STAT_READ_ERRS + 1)
 442                                 printf("[%s].read_io_errs    %llu\n",
 443                                        canonical_path,
 444                                        (unsigned long long) args.values[
 445                                         BTRFS_DEV_STAT_READ_ERRS]);
 446                         if (args.nr_items >= BTRFS_DEV_STAT_FLUSH_ERRS + 1)
 447                                 printf("[%s].flush_io_errs   %llu\n",
 448                                        canonical_path,
 449                                        (unsigned long long) args.values[
 450                                         BTRFS_DEV_STAT_FLUSH_ERRS]);
 451                         if (args.nr_items >= BTRFS_DEV_STAT_CORRUPTION_ERRS + 1)
 452                                 printf("[%s].corruption_errs %llu\n",
 453                                        canonical_path,
 454                                        (unsigned long long) args.values[
 455                                         BTRFS_DEV_STAT_CORRUPTION_ERRS]);
 456                         if (args.nr_items >= BTRFS_DEV_STAT_GENERATION_ERRS + 1)
 457                                 printf("[%s].generation_errs %llu\n",
 458                                        canonical_path,
 459                                        (unsigned long long) args.values[
 460                                         BTRFS_DEV_STAT_GENERATION_ERRS]);
 461
 462                         free(canonical_path);
 463                 }
 464         }
 465
 466 out:
 467         free(di_args);
 468         close_file_or_dir(fdmnt, dirstream);
 469         btrfs_close_all_devices();
 470
 471         return err;
 472 }
 473
 474 static const char * const cmd_device_usage_usage[] = {
 475         "btrfs device usage [options] <path> [<path>..]",
 476         "Show detailed information about internal allocations in devices.",
 477         HELPINFO_OUTPUT_UNIT_DF,
 478         NULL
 479 };
 480
 481 static int _cmd_device_usage(int fd, char *path, unsigned unit_mode)
 482 {
 483         int i;
 484         int ret = 0;
 485         struct chunk_info *chunkinfo = NULL;
 486         struct device_info *devinfo = NULL;
 487         int chunkcount = 0;
 488         int devcount = 0;
 489
 490         ret = load_chunk_and_device_info(fd, &chunkinfo, &chunkcount, &devinfo,
 491                         &devcount);
 492         if (ret)
 493                 goto out;
 494
 495         for (i = 0; i < devcount; i++) {
 496                 printf("%s, ID: %llu\n", devinfo[i].path, devinfo[i].devid);
 497                 print_device_sizes(fd, &devinfo[i], unit_mode);
 498                 print_device_chunks(fd, &devinfo[i], chunkinfo, chunkcount,
 499                                 unit_mode);
 500                 printf("\n");
 501         }
 502
 503 out:
 504         free(devinfo);
 505         free(chunkinfo);
 506
 507         return ret;
 508 }
 509
 510 static int cmd_device_usage(int argc, char **argv)
 511 {
 512         unsigned unit_mode;
 513         int ret = 0;
 514         int more_than_one = 0;
 515         int i;
 516
 517         unit_mode = get_unit_mode_from_arg(&argc, argv, 1);
 518
 519         if (check_argc_min(argc, 2) || argv[1][0] == '-')
 520                 usage(cmd_device_usage_usage);
 521
 522         for (i = 1; i < argc; i++) {
 523                 int fd;
 524                 DIR *dirstream = NULL;
 525
 526                 if (more_than_one)
 527                         printf("\n");
 528
 529                 fd = btrfs_open_dir(argv[i], &dirstream, 1);
 530                 if (fd < 0) {
 531                         ret = 1;
 532                         goto out;
 533                 }
 534
 535                 ret = _cmd_device_usage(fd, argv[i], unit_mode);
 536                 close_file_or_dir(fd, dirstream);
 537
 538                 if (ret)
 539                         goto out;
 540                 more_than_one = 1;
 541         }
 542 out:
 543         return !!ret;
 544 }
 545
 546 static const char device_cmd_group_info[] =
 547 "manage and query devices in the filesystem";
 548
 549 const struct cmd_group device_cmd_group = {
 550         device_cmd_group_usage, device_cmd_group_info, {
 551                 { "add", cmd_device_add, cmd_device_add_usage, NULL, 0 },
 552                 { "delete", cmd_device_delete, cmd_device_delete_usage, NULL,
 553                         CMD_ALIAS },
 554                 { "remove", cmd_device_remove, cmd_device_remove_usage, NULL, 0 },
 555                 { "scan", cmd_device_scan, cmd_device_scan_usage, NULL, 0 },
 556                 { "ready", cmd_device_ready, cmd_device_ready_usage, NULL, 0 },
 557                 { "stats", cmd_device_stats, cmd_device_stats_usage, NULL, 0 },
 558                 { "usage", cmd_device_usage,
 559                         cmd_device_usage_usage, NULL, 0 },
 560                 NULL_CMD_STRUCT
 561         }
 562 };
 563
 564 int cmd_device(int argc, char **argv)
 565 {
 566         return handle_command_group(&device_cmd_group, argc, argv);
 567 }