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