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                 int     res;
 163
 164                 if (is_block_device(argv[i]) != 1 && strcmp(argv[i], "missing")) {
 165                         error("not a block device: %s", argv[i]);
 166                         ret++;
 167                         continue;
 168                 }
 169                 memset(&arg, 0, sizeof(arg));
 170                 strncpy_null(arg.name, argv[i]);
 171                 /*
 172                  * Positive values are from BTRFS_ERROR_DEV_*,
 173                  * otherwise it's a generic error, one of errnos
 174                  */
 175                 res = ioctl(fdmnt, BTRFS_IOC_RM_DEV, &arg);
 176                 if (res) {
 177                         const char *msg;
 178
 179                         if (res > 0)
 180                                 msg = btrfs_err_str(res);
 181                         else
 182                                 msg = strerror(errno);
 183                         error("error removing device '%s': %s",
 184                                 argv[i], msg);
 185                         ret++;
 186                 }
 187         }
 188
 189         close_file_or_dir(fdmnt, dirstream);
 190         return !!ret;
 191 }
 192
 193 static const char * const cmd_device_remove_usage[] = {
 194         "btrfs device remove <device> [<device>...] <path>",
 195         "Remove a device from a filesystem",
 196         NULL
 197 };
 198
 199 static int cmd_device_remove(int argc, char **argv)
 200 {
 201         return _cmd_device_remove(argc, argv, cmd_device_remove_usage);
 202 }
 203
 204 static const char * const cmd_device_delete_usage[] = {
 205         "btrfs device delete <device> [<device>...] <path>",
 206         "Remove a device from a filesystem",
 207         NULL
 208 };
 209
 210 static int cmd_device_delete(int argc, char **argv)
 211 {
 212         return _cmd_device_remove(argc, argv, cmd_device_delete_usage);
 213 }
 214
 215 static const char * const cmd_device_scan_usage[] = {
 216         "btrfs device scan [(-d|--all-devices)|<device> [<device>...]]",
 217         "Scan devices for a btrfs filesystem",
 218         " -d|--all-devices (deprecated)",
 219         NULL
 220 };
 221
 222 static int cmd_device_scan(int argc, char **argv)
 223 {
 224         int i;
 225         int devstart;
 226         int all = 0;
 227         int ret = 0;
 228
 229         optind = 1;
 230         while (1) {
 231                 int c;
 232                 static const struct option long_options[] = {
 233                         { "all-devices", no_argument, NULL, 'd'},
 234                         { NULL, 0, NULL, 0}
 235                 };
 236
 237                 c = getopt_long(argc, argv, "d", long_options, NULL);
 238                 if (c < 0)
 239                         break;
 240                 switch (c) {
 241                 case 'd':
 242                         all = 1;
 243                         break;
 244                 default:
 245                         usage(cmd_device_scan_usage);
 246                 }
 247         }
 248         devstart = optind;
 249
 250         if (all && check_argc_max(argc - optind, 1))
 251                 usage(cmd_device_scan_usage);
 252
 253         if (all || argc - optind == 0) {
 254                 printf("Scanning for Btrfs filesystems\n");
 255                 ret = btrfs_scan_lblkid();
 256                 error_on(ret, "error %d while scanning", ret);
 257                 ret = btrfs_register_all_devices();
 258                 error_on(ret, "there are %d errors while registering devices", ret);
 259                 goto out;
 260         }
 261
 262         for( i = devstart ; i < argc ; i++ ){
 263                 char *path;
 264
 265                 if (is_block_device(argv[i]) != 1) {
 266                         error("not a block device: %s", argv[i]);
 267                         ret = 1;
 268                         goto out;
 269                 }
 270                 path = canonicalize_path(argv[i]);
 271                 if (!path) {
 272                         error("could not canonicalize path '%s': %s",
 273                                 argv[i], strerror(errno));
 274                         ret = 1;
 275                         goto out;
 276                 }
 277                 printf("Scanning for Btrfs filesystems in '%s'\n", path);
 278                 if (btrfs_register_one_device(path) != 0) {
 279                         ret = 1;
 280                         free(path);
 281                         goto out;
 282                 }
 283                 free(path);
 284         }
 285
 286 out:
 287         return !!ret;
 288 }
 289
 290 static const char * const cmd_device_ready_usage[] = {
 291         "btrfs device ready <device>",
 292         "Check device to see if it has all of its devices in cache for mounting",
 293         NULL
 294 };
 295
 296 static int cmd_device_ready(int argc, char **argv)
 297 {
 298         struct  btrfs_ioctl_vol_args args;
 299         int     fd;
 300         int     ret;
 301         char    *path;
 302
 303         clean_args_no_options(argc, argv, cmd_device_ready_usage);
 304
 305         if (check_argc_min(argc - optind, 1))
 306                 usage(cmd_device_ready_usage);
 307
 308         fd = open("/dev/btrfs-control", O_RDWR);
 309         if (fd < 0) {
 310                 perror("failed to open /dev/btrfs-control");
 311                 return 1;
 312         }
 313
 314         path = canonicalize_path(argv[optind]);
 315         if (!path) {
 316                 error("could not canonicalize pathname '%s': %s",
 317                         argv[optind], strerror(errno));
 318                 ret = 1;
 319                 goto out;
 320         }
 321
 322         if (is_block_device(path) != 1) {
 323                 error("not a block device: %s", path);
 324                 ret = 1;
 325                 goto out;
 326         }
 327
 328         memset(&args, 0, sizeof(args));
 329         strncpy_null(args.name, path);
 330         ret = ioctl(fd, BTRFS_IOC_DEVICES_READY, &args);
 331         if (ret < 0) {
 332                 error("unable to determine if device '%s' is ready for mount: %s",
 333                         path, strerror(errno));
 334                 ret = 1;
 335         }
 336
 337 out:
 338         free(path);
 339         close(fd);
 340         return ret;
 341 }
 342
 343 static const char * const cmd_device_stats_usage[] = {
 344         "btrfs device stats [-z] <path>|<device>",
 345         "Show current device IO stats.",
 346         "",
 347         "-z                     show current stats and reset values to zero",
 348         NULL
 349 };
 350
 351 static int cmd_device_stats(int argc, char **argv)
 352 {
 353         char *dev_path;
 354         struct btrfs_ioctl_fs_info_args fi_args;
 355         struct btrfs_ioctl_dev_info_args *di_args = NULL;
 356         int ret;
 357         int fdmnt;
 358         int i;
 359         int c;
 360         int err = 0;
 361         __u64 flags = 0;
 362         DIR *dirstream = NULL;
 363
 364         optind = 1;
 365         while ((c = getopt(argc, argv, "z")) != -1) {
 366                 switch (c) {
 367                 case 'z':
 368                         flags = BTRFS_DEV_STATS_RESET;
 369                         break;
 370                 case '?':
 371                 default:
 372                         usage(cmd_device_stats_usage);
 373                 }
 374         }
 375
 376         if (check_argc_exact(argc - optind, 1))
 377                 usage(cmd_device_stats_usage);
 378
 379         dev_path = argv[optind];
 380
 381         fdmnt = open_path_or_dev_mnt(dev_path, &dirstream, 1);
 382         if (fdmnt < 0)
 383                 return 1;
 384
 385         ret = get_fs_info(dev_path, &fi_args, &di_args);
 386         if (ret) {
 387                 error("getting dev info for devstats failed: %s",
 388                         strerror(-ret));
 389                 err = 1;
 390                 goto out;
 391         }
 392         if (!fi_args.num_devices) {
 393                 error("no devices found");
 394                 err = 1;
 395                 goto out;
 396         }
 397
 398         for (i = 0; i < fi_args.num_devices; i++) {
 399                 struct btrfs_ioctl_get_dev_stats args = {0};
 400                 __u8 path[BTRFS_DEVICE_PATH_NAME_MAX + 1];
 401
 402                 strncpy((char *)path, (char *)di_args[i].path,
 403                         BTRFS_DEVICE_PATH_NAME_MAX);
 404                 path[BTRFS_DEVICE_PATH_NAME_MAX] = '\0';
 405
 406                 args.devid = di_args[i].devid;
 407                 args.nr_items = BTRFS_DEV_STAT_VALUES_MAX;
 408                 args.flags = flags;
 409
 410                 if (ioctl(fdmnt, BTRFS_IOC_GET_DEV_STATS, &args) < 0) {
 411                         error("DEV_STATS ioctl failed on %s: %s",
 412                               path, strerror(errno));
 413                         err = 1;
 414                 } else {
 415                         char *canonical_path;
 416
 417                         canonical_path = canonicalize_path((char *)path);
 418
 419                         if (args.nr_items >= BTRFS_DEV_STAT_WRITE_ERRS + 1)
 420                                 printf("[%s].write_io_errs   %llu\n",
 421                                        canonical_path,
 422                                        (unsigned long long) args.values[
 423                                         BTRFS_DEV_STAT_WRITE_ERRS]);
 424                         if (args.nr_items >= BTRFS_DEV_STAT_READ_ERRS + 1)
 425                                 printf("[%s].read_io_errs    %llu\n",
 426                                        canonical_path,
 427                                        (unsigned long long) args.values[
 428                                         BTRFS_DEV_STAT_READ_ERRS]);
 429                         if (args.nr_items >= BTRFS_DEV_STAT_FLUSH_ERRS + 1)
 430                                 printf("[%s].flush_io_errs   %llu\n",
 431                                        canonical_path,
 432                                        (unsigned long long) args.values[
 433                                         BTRFS_DEV_STAT_FLUSH_ERRS]);
 434                         if (args.nr_items >= BTRFS_DEV_STAT_CORRUPTION_ERRS + 1)
 435                                 printf("[%s].corruption_errs %llu\n",
 436                                        canonical_path,
 437                                        (unsigned long long) args.values[
 438                                         BTRFS_DEV_STAT_CORRUPTION_ERRS]);
 439                         if (args.nr_items >= BTRFS_DEV_STAT_GENERATION_ERRS + 1)
 440                                 printf("[%s].generation_errs %llu\n",
 441                                        canonical_path,
 442                                        (unsigned long long) args.values[
 443                                         BTRFS_DEV_STAT_GENERATION_ERRS]);
 444
 445                         free(canonical_path);
 446                 }
 447         }
 448
 449 out:
 450         free(di_args);
 451         close_file_or_dir(fdmnt, dirstream);
 452
 453         return err;
 454 }
 455
 456 static const char * const cmd_device_usage_usage[] = {
 457         "btrfs device usage [options] <path> [<path>..]",
 458         "Show detailed information about internal allocations in devices.",
 459         HELPINFO_UNITS_SHORT_LONG,
 460         NULL
 461 };
 462
 463 static int _cmd_device_usage(int fd, char *path, unsigned unit_mode)
 464 {
 465         int i;
 466         int ret = 0;
 467         struct chunk_info *chunkinfo = NULL;
 468         struct device_info *devinfo = NULL;
 469         int chunkcount = 0;
 470         int devcount = 0;
 471
 472         ret = load_chunk_and_device_info(fd, &chunkinfo, &chunkcount, &devinfo,
 473                         &devcount);
 474         if (ret)
 475                 goto out;
 476
 477         for (i = 0; i < devcount; i++) {
 478                 printf("%s, ID: %llu\n", devinfo[i].path, devinfo[i].devid);
 479                 print_device_sizes(fd, &devinfo[i], unit_mode);
 480                 print_device_chunks(fd, &devinfo[i], chunkinfo, chunkcount,
 481                                 unit_mode);
 482                 printf("\n");
 483         }
 484
 485 out:
 486         free(devinfo);
 487         free(chunkinfo);
 488
 489         return ret;
 490 }
 491
 492 static int cmd_device_usage(int argc, char **argv)
 493 {
 494         unsigned unit_mode;
 495         int ret = 0;
 496         int i;
 497
 498         unit_mode = get_unit_mode_from_arg(&argc, argv, 1);
 499
 500         clean_args_no_options(argc, argv, cmd_device_usage_usage);
 501
 502         if (check_argc_min(argc - optind, 1))
 503                 usage(cmd_device_usage_usage);
 504
 505         for (i = optind; i < argc; i++) {
 506                 int fd;
 507                 DIR *dirstream = NULL;
 508
 509                 if (i > 1)
 510                         printf("\n");
 511
 512                 fd = btrfs_open_dir(argv[i], &dirstream, 1);
 513                 if (fd < 0) {
 514                         ret = 1;
 515                         break;
 516                 }
 517
 518                 ret = _cmd_device_usage(fd, argv[i], unit_mode);
 519                 close_file_or_dir(fd, dirstream);
 520
 521                 if (ret)
 522                         break;
 523         }
 524
 525         return !!ret;
 526 }
 527
 528 static const char device_cmd_group_info[] =
 529 "manage and query devices in the filesystem";
 530
 531 const struct cmd_group device_cmd_group = {
 532         device_cmd_group_usage, device_cmd_group_info, {
 533                 { "add", cmd_device_add, cmd_device_add_usage, NULL, 0 },
 534                 { "delete", cmd_device_delete, cmd_device_delete_usage, NULL,
 535                         CMD_ALIAS },
 536                 { "remove", cmd_device_remove, cmd_device_remove_usage, NULL, 0 },
 537                 { "scan", cmd_device_scan, cmd_device_scan_usage, NULL, 0 },
 538                 { "ready", cmd_device_ready, cmd_device_ready_usage, NULL, 0 },
 539                 { "stats", cmd_device_stats, cmd_device_stats_usage, NULL, 0 },
 540                 { "usage", cmd_device_usage,
 541                         cmd_device_usage_usage, NULL, 0 },
 542                 NULL_CMD_STRUCT
 543         }
 544 };
 545
 546 int cmd_device(int argc, char **argv)
 547 {
 548         return handle_command_group(&device_cmd_group, argc, argv);
 549 }