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         if (check_argc_min(argc, 3))
 150                 usage(usagestr);
 151
 152         mntpnt = argv[argc - 1];
 153
 154         fdmnt = btrfs_open_dir(mntpnt, &dirstream, 1);
 155         if (fdmnt < 0)
 156                 return 1;
 157
 158         for(i=1 ; i < argc - 1; i++ ){
 159                 struct  btrfs_ioctl_vol_args arg;
 160                 int     res;
 161
 162                 if (is_block_device(argv[i]) != 1 && strcmp(argv[i], "missing")) {
 163                         error("not a block device: %s", argv[i]);
 164                         ret++;
 165                         continue;
 166                 }
 167                 memset(&arg, 0, sizeof(arg));
 168                 strncpy_null(arg.name, argv[i]);
 169                 /*
 170                  * Positive values are from BTRFS_ERROR_DEV_*,
 171                  * otherwise it's a generic error, one of errnos
 172                  */
 173                 res = ioctl(fdmnt, BTRFS_IOC_RM_DEV, &arg);
 174                 if (res) {
 175                         const char *msg;
 176
 177                         if (res > 0)
 178                                 msg = btrfs_err_str(res);
 179                         else
 180                                 msg = strerror(errno);
 181                         error("error removing device '%s': %s",
 182                                 argv[i], msg);
 183                         ret++;
 184                 }
 185         }
 186
 187         close_file_or_dir(fdmnt, dirstream);
 188         return !!ret;
 189 }
 190
 191 static const char * const cmd_device_remove_usage[] = {
 192         "btrfs device remove <device> [<device>...] <path>",
 193         "Remove a device from a filesystem",
 194         NULL
 195 };
 196
 197 static int cmd_device_remove(int argc, char **argv)
 198 {
 199         return _cmd_device_remove(argc, argv, cmd_device_remove_usage);
 200 }
 201
 202 static const char * const cmd_device_delete_usage[] = {
 203         "btrfs device delete <device> [<device>...] <path>",
 204         "Remove a device from a filesystem",
 205         NULL
 206 };
 207
 208 static int cmd_device_delete(int argc, char **argv)
 209 {
 210         return _cmd_device_remove(argc, argv, cmd_device_delete_usage);
 211 }
 212
 213 static const char * const cmd_device_scan_usage[] = {
 214         "btrfs device scan [(-d|--all-devices)|<device> [<device>...]]",
 215         "Scan devices for a btrfs filesystem",
 216         " -d|--all-devices (deprecated)",
 217         NULL
 218 };
 219
 220 static int cmd_device_scan(int argc, char **argv)
 221 {
 222         int i;
 223         int devstart = 1;
 224         int all = 0;
 225         int ret = 0;
 226
 227         optind = 1;
 228         while (1) {
 229                 int c;
 230                 static const struct option long_options[] = {
 231                         { "all-devices", no_argument, NULL, 'd'},
 232                         { NULL, 0, NULL, 0}
 233                 };
 234
 235                 c = getopt_long(argc, argv, "d", long_options, NULL);
 236                 if (c < 0)
 237                         break;
 238                 switch (c) {
 239                 case 'd':
 240                         all = 1;
 241                         break;
 242                 default:
 243                         usage(cmd_device_scan_usage);
 244                 }
 245         }
 246
 247         if (all && check_argc_max(argc, 2))
 248                 usage(cmd_device_scan_usage);
 249
 250         if (all || argc == 1) {
 251                 printf("Scanning for Btrfs filesystems\n");
 252                 ret = btrfs_scan_lblkid();
 253                 error_on(ret, "error %d while scanning", ret);
 254                 ret = btrfs_register_all_devices();
 255                 error_on(ret, "error %d while registering devices", ret);
 256                 goto out;
 257         }
 258
 259         for( i = devstart ; i < argc ; i++ ){
 260                 char *path;
 261
 262                 if (is_block_device(argv[i]) != 1) {
 263                         error("not a block device: %s", argv[i]);
 264                         ret = 1;
 265                         goto out;
 266                 }
 267                 path = canonicalize_path(argv[i]);
 268                 if (!path) {
 269                         error("could not canonicalize path '%s': %s",
 270                                 argv[i], strerror(errno));
 271                         ret = 1;
 272                         goto out;
 273                 }
 274                 printf("Scanning for Btrfs filesystems in '%s'\n", path);
 275                 if (btrfs_register_one_device(path) != 0) {
 276                         ret = 1;
 277                         free(path);
 278                         goto out;
 279                 }
 280                 free(path);
 281         }
 282
 283 out:
 284         return !!ret;
 285 }
 286
 287 static const char * const cmd_device_ready_usage[] = {
 288         "btrfs device ready <device>",
 289         "Check device to see if it has all of its devices in cache for mounting",
 290         NULL
 291 };
 292
 293 static int cmd_device_ready(int argc, char **argv)
 294 {
 295         struct  btrfs_ioctl_vol_args args;
 296         int     fd;
 297         int     ret;
 298         char    *path;
 299
 300         if (check_argc_min(argc, 2))
 301                 usage(cmd_device_ready_usage);
 302
 303         fd = open("/dev/btrfs-control", O_RDWR);
 304         if (fd < 0) {
 305                 perror("failed to open /dev/btrfs-control");
 306                 return 1;
 307         }
 308
 309         path = canonicalize_path(argv[argc - 1]);
 310         if (!path) {
 311                 error("could not canonicalize pathname '%s': %s",
 312                         argv[argc - 1], strerror(errno));
 313                 ret = 1;
 314                 goto out;
 315         }
 316
 317         if (is_block_device(path) != 1) {
 318                 error("not a block device: %s", path);
 319                 ret = 1;
 320                 goto out;
 321         }
 322
 323         memset(&args, 0, sizeof(args));
 324         strncpy_null(args.name, path);
 325         ret = ioctl(fd, BTRFS_IOC_DEVICES_READY, &args);
 326         if (ret < 0) {
 327                 error("unable to determine if device '%s' is ready for mount: %s",
 328                         path, strerror(errno));
 329                 ret = 1;
 330         }
 331
 332 out:
 333         free(path);
 334         close(fd);
 335         return ret;
 336 }
 337
 338 static const char * const cmd_device_stats_usage[] = {
 339         "btrfs device stats [-z] <path>|<device>",
 340         "Show current device IO stats.",
 341         "",
 342         "-z                     show current stats and reset values to zero",
 343         NULL
 344 };
 345
 346 static int cmd_device_stats(int argc, char **argv)
 347 {
 348         char *dev_path;
 349         struct btrfs_ioctl_fs_info_args fi_args;
 350         struct btrfs_ioctl_dev_info_args *di_args = NULL;
 351         int ret;
 352         int fdmnt;
 353         int i;
 354         int c;
 355         int err = 0;
 356         __u64 flags = 0;
 357         DIR *dirstream = NULL;
 358
 359         optind = 1;
 360         while ((c = getopt(argc, argv, "z")) != -1) {
 361                 switch (c) {
 362                 case 'z':
 363                         flags = BTRFS_DEV_STATS_RESET;
 364                         break;
 365                 case '?':
 366                 default:
 367                         usage(cmd_device_stats_usage);
 368                 }
 369         }
 370
 371         argc = argc - optind;
 372         if (check_argc_exact(argc, 1))
 373                 usage(cmd_device_stats_usage);
 374
 375         dev_path = argv[optind];
 376
 377         fdmnt = open_path_or_dev_mnt(dev_path, &dirstream, 1);
 378         if (fdmnt < 0)
 379                 return 1;
 380
 381         ret = get_fs_info(dev_path, &fi_args, &di_args);
 382         if (ret) {
 383                 error("getting dev info for devstats failed: %s",
 384                         strerror(-ret));
 385                 err = 1;
 386                 goto out;
 387         }
 388         if (!fi_args.num_devices) {
 389                 error("no devices found");
 390                 err = 1;
 391                 goto out;
 392         }
 393
 394         for (i = 0; i < fi_args.num_devices; i++) {
 395                 struct btrfs_ioctl_get_dev_stats args = {0};
 396                 __u8 path[BTRFS_DEVICE_PATH_NAME_MAX + 1];
 397
 398                 strncpy((char *)path, (char *)di_args[i].path,
 399                         BTRFS_DEVICE_PATH_NAME_MAX);
 400                 path[BTRFS_DEVICE_PATH_NAME_MAX] = '\0';
 401
 402                 args.devid = di_args[i].devid;
 403                 args.nr_items = BTRFS_DEV_STAT_VALUES_MAX;
 404                 args.flags = flags;
 405
 406                 if (ioctl(fdmnt, BTRFS_IOC_GET_DEV_STATS, &args) < 0) {
 407                         error("DEV_STATS ioctl failed on %s: %s",
 408                               path, strerror(errno));
 409                         err = 1;
 410                 } else {
 411                         char *canonical_path;
 412
 413                         canonical_path = canonicalize_path((char *)path);
 414
 415                         if (args.nr_items >= BTRFS_DEV_STAT_WRITE_ERRS + 1)
 416                                 printf("[%s].write_io_errs   %llu\n",
 417                                        canonical_path,
 418                                        (unsigned long long) args.values[
 419                                         BTRFS_DEV_STAT_WRITE_ERRS]);
 420                         if (args.nr_items >= BTRFS_DEV_STAT_READ_ERRS + 1)
 421                                 printf("[%s].read_io_errs    %llu\n",
 422                                        canonical_path,
 423                                        (unsigned long long) args.values[
 424                                         BTRFS_DEV_STAT_READ_ERRS]);
 425                         if (args.nr_items >= BTRFS_DEV_STAT_FLUSH_ERRS + 1)
 426                                 printf("[%s].flush_io_errs   %llu\n",
 427                                        canonical_path,
 428                                        (unsigned long long) args.values[
 429                                         BTRFS_DEV_STAT_FLUSH_ERRS]);
 430                         if (args.nr_items >= BTRFS_DEV_STAT_CORRUPTION_ERRS + 1)
 431                                 printf("[%s].corruption_errs %llu\n",
 432                                        canonical_path,
 433                                        (unsigned long long) args.values[
 434                                         BTRFS_DEV_STAT_CORRUPTION_ERRS]);
 435                         if (args.nr_items >= BTRFS_DEV_STAT_GENERATION_ERRS + 1)
 436                                 printf("[%s].generation_errs %llu\n",
 437                                        canonical_path,
 438                                        (unsigned long long) args.values[
 439                                         BTRFS_DEV_STAT_GENERATION_ERRS]);
 440
 441                         free(canonical_path);
 442                 }
 443         }
 444
 445 out:
 446         free(di_args);
 447         close_file_or_dir(fdmnt, dirstream);
 448
 449         return err;
 450 }
 451
 452 static const char * const cmd_device_usage_usage[] = {
 453         "btrfs device usage [options] <path> [<path>..]",
 454         "Show detailed information about internal allocations in devices.",
 455         HELPINFO_UNITS_SHORT_LONG,
 456         NULL
 457 };
 458
 459 static int _cmd_device_usage(int fd, char *path, unsigned unit_mode)
 460 {
 461         int i;
 462         int ret = 0;
 463         struct chunk_info *chunkinfo = NULL;
 464         struct device_info *devinfo = NULL;
 465         int chunkcount = 0;
 466         int devcount = 0;
 467
 468         ret = load_chunk_and_device_info(fd, &chunkinfo, &chunkcount, &devinfo,
 469                         &devcount);
 470         if (ret)
 471                 goto out;
 472
 473         for (i = 0; i < devcount; i++) {
 474                 printf("%s, ID: %llu\n", devinfo[i].path, devinfo[i].devid);
 475                 print_device_sizes(fd, &devinfo[i], unit_mode);
 476                 print_device_chunks(fd, &devinfo[i], chunkinfo, chunkcount,
 477                                 unit_mode);
 478                 printf("\n");
 479         }
 480
 481 out:
 482         free(devinfo);
 483         free(chunkinfo);
 484
 485         return ret;
 486 }
 487
 488 static int cmd_device_usage(int argc, char **argv)
 489 {
 490         unsigned unit_mode;
 491         int ret = 0;
 492         int i;
 493
 494         unit_mode = get_unit_mode_from_arg(&argc, argv, 1);
 495
 496         if (check_argc_min(argc, 2) || argv[1][0] == '-')
 497                 usage(cmd_device_usage_usage);
 498
 499         for (i = 1; i < argc; i++) {
 500                 int fd;
 501                 DIR *dirstream = NULL;
 502
 503                 if (i > 1)
 504                         printf("\n");
 505
 506                 fd = btrfs_open_dir(argv[i], &dirstream, 1);
 507                 if (fd < 0) {
 508                         ret = 1;
 509                         break;
 510                 }
 511
 512                 ret = _cmd_device_usage(fd, argv[i], unit_mode);
 513                 close_file_or_dir(fd, dirstream);
 514
 515                 if (ret)
 516                         break;
 517         }
 518
 519         return !!ret;
 520 }
 521
 522 static const char device_cmd_group_info[] =
 523 "manage and query devices in the filesystem";
 524
 525 const struct cmd_group device_cmd_group = {
 526         device_cmd_group_usage, device_cmd_group_info, {
 527                 { "add", cmd_device_add, cmd_device_add_usage, NULL, 0 },
 528                 { "delete", cmd_device_delete, cmd_device_delete_usage, NULL,
 529                         CMD_ALIAS },
 530                 { "remove", cmd_device_remove, cmd_device_remove_usage, NULL, 0 },
 531                 { "scan", cmd_device_scan, cmd_device_scan_usage, NULL, 0 },
 532                 { "ready", cmd_device_ready, cmd_device_ready_usage, NULL, 0 },
 533                 { "stats", cmd_device_stats, cmd_device_stats_usage, NULL, 0 },
 534                 { "usage", cmd_device_usage,
 535                         cmd_device_usage_usage, NULL, 0 },
 536                 NULL_CMD_STRUCT
 537         }
 538 };
 539
 540 int cmd_device(int argc, char **argv)
 541 {
 542         return handle_command_group(&device_cmd_group, argc, argv);
 543 }