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
  32 #include "commands.h"
  33
  34 static const char * const device_cmd_group_usage[] = {
  35         "btrfs device <command> [<args>]",
  36         NULL
  37 };
  38
  39 static const char * const cmd_add_dev_usage[] = {
  40         "btrfs device add [options] <device> [<device>...] <path>",
  41         "Add a device to a filesystem",
  42         "-K|--nodiscard    do not perform whole device TRIM",
  43         "-f|--force        force overwrite existing filesystem on the disk",
  44         NULL
  45 };
  46
  47 static int cmd_add_dev(int argc, char **argv)
  48 {
  49         char    *mntpnt;
  50         int     i, fdmnt, ret=0, e;
  51         DIR     *dirstream = NULL;
  52         int discard = 1;
  53         int force = 0;
  54         char estr[100];
  55
  56         while (1) {
  57                 int long_index;
  58                 static struct option long_options[] = {
  59                         { "nodiscard", optional_argument, NULL, 'K'},
  60                         { "force", no_argument, NULL, 'f'},
  61                         { 0, 0, 0, 0 }
  62                 };
  63                 int c = getopt_long(argc, argv, "Kf", long_options,
  64                                         &long_index);
  65                 if (c < 0)
  66                         break;
  67                 switch (c) {
  68                 case 'K':
  69                         discard = 0;
  70                         break;
  71                 case 'f':
  72                         force = 1;
  73                         break;
  74                 default:
  75                         usage(cmd_add_dev_usage);
  76                 }
  77         }
  78
  79         argc = argc - optind;
  80
  81         if (check_argc_min(argc, 2))
  82                 usage(cmd_add_dev_usage);
  83
  84         mntpnt = argv[optind + argc - 1];
  85
  86         fdmnt = open_file_or_dir(mntpnt, &dirstream);
  87         if (fdmnt < 0) {
  88                 fprintf(stderr, "ERROR: can't access '%s'\n", mntpnt);
  89                 return 1;
  90         }
  91
  92         for (i = optind; i < optind + argc - 1; i++){
  93                 struct btrfs_ioctl_vol_args ioctl_args;
  94                 int     devfd, res;
  95                 u64 dev_block_count = 0;
  96                 int mixed = 0;
  97                 char *path;
  98
  99                 res = test_dev_for_mkfs(argv[i], force, estr);
 100                 if (res) {
 101                         fprintf(stderr, "%s", estr);
 102                         ret++;
 103                         continue;
 104                 }
 105
 106                 devfd = open(argv[i], O_RDWR);
 107                 if (devfd < 0) {
 108                         fprintf(stderr, "ERROR: Unable to open device '%s'\n", argv[i]);
 109                         ret++;
 110                         continue;
 111                 }
 112
 113                 res = btrfs_prepare_device(devfd, argv[i], 1, &dev_block_count,
 114                                            0, &mixed, discard);
 115                 close(devfd);
 116                 if (res) {
 117                         ret++;
 118                         goto error_out;
 119                 }
 120
 121                 path = canonicalize_path(argv[i]);
 122                 if (!path) {
 123                         fprintf(stderr,
 124                                 "ERROR: Could not canonicalize pathname '%s': %s\n",
 125                                 argv[i], strerror(errno));
 126                         ret++;
 127                         goto error_out;
 128                 }
 129
 130                 strncpy_null(ioctl_args.name, path);
 131                 res = ioctl(fdmnt, BTRFS_IOC_ADD_DEV, &ioctl_args);
 132                 e = errno;
 133                 if (res < 0) {
 134                         fprintf(stderr, "ERROR: error adding the device '%s' - %s\n",
 135                                 path, strerror(e));
 136                         ret++;
 137                 }
 138                 free(path);
 139         }
 140
 141 error_out:
 142         close_file_or_dir(fdmnt, dirstream);
 143         return !!ret;
 144 }
 145
 146 static const char * const cmd_rm_dev_usage[] = {
 147         "btrfs device delete <device> [<device>...] <path>",
 148         "Remove a device from a filesystem",
 149         NULL
 150 };
 151
 152 static int cmd_rm_dev(int argc, char **argv)
 153 {
 154         char    *mntpnt;
 155         int     i, fdmnt, ret=0, e;
 156         DIR     *dirstream = NULL;
 157
 158         if (check_argc_min(argc, 3))
 159                 usage(cmd_rm_dev_usage);
 160
 161         mntpnt = argv[argc - 1];
 162
 163         fdmnt = open_file_or_dir(mntpnt, &dirstream);
 164         if (fdmnt < 0) {
 165                 fprintf(stderr, "ERROR: can't access '%s'\n", mntpnt);
 166                 return 1;
 167         }
 168
 169         for(i=1 ; i < argc - 1; i++ ){
 170                 struct  btrfs_ioctl_vol_args arg;
 171                 int     res;
 172
 173                 if (!is_block_device(argv[i])) {
 174                         fprintf(stderr,
 175                                 "ERROR: %s is not a block device\n", argv[i]);
 176                         ret++;
 177                         continue;
 178                 }
 179                 strncpy_null(arg.name, argv[i]);
 180                 res = ioctl(fdmnt, BTRFS_IOC_RM_DEV, &arg);
 181                 e = errno;
 182                 if (res > 0) {
 183                         fprintf(stderr,
 184                                 "ERROR: error removing the device '%s' - %s\n",
 185                                 argv[i], btrfs_err_str(res));
 186                         ret++;
 187                 } else if (res < 0) {
 188                         fprintf(stderr,
 189                                 "ERROR: error removing the device '%s' - %s\n",
 190                                 argv[i], strerror(e));
 191                         ret++;
 192                 }
 193         }
 194
 195         close_file_or_dir(fdmnt, dirstream);
 196         return !!ret;
 197 }
 198
 199 static const char * const cmd_scan_dev_usage[] = {
 200         "btrfs device scan [(-d|--all-devices)|<device> [<device>...]]",
 201         "Scan devices for a btrfs filesystem",
 202         " -d|--all-devices (deprecated)",
 203         NULL
 204 };
 205
 206 static int cmd_scan_dev(int argc, char **argv)
 207 {
 208         int i, fd, e;
 209         int devstart = 1;
 210         int all = 0;
 211         int ret = 0;
 212
 213         optind = 1;
 214         while (1) {
 215                 int long_index;
 216                 static struct option long_options[] = {
 217                         { "all-devices", no_argument, NULL, 'd'},
 218                         { 0, 0, 0, 0 },
 219                 };
 220                 int c = getopt_long(argc, argv, "d", long_options,
 221                                     &long_index);
 222                 if (c < 0)
 223                         break;
 224                 switch (c) {
 225                 case 'd':
 226                         all = 1;
 227                         break;
 228                 default:
 229                         usage(cmd_scan_dev_usage);
 230                 }
 231         }
 232
 233         if (all && check_argc_max(argc, 2))
 234                 usage(cmd_scan_dev_usage);
 235
 236         if (all || argc == 1) {
 237                 printf("Scanning for Btrfs filesystems\n");
 238                 ret = btrfs_scan_lblkid(BTRFS_UPDATE_KERNEL);
 239                 if (ret)
 240                         fprintf(stderr, "ERROR: error %d while scanning\n", ret);
 241                 goto out;
 242         }
 243
 244         fd = open("/dev/btrfs-control", O_RDWR);
 245         if (fd < 0) {
 246                 perror("failed to open /dev/btrfs-control");
 247                 ret = 1;
 248                 goto out;
 249         }
 250
 251         for( i = devstart ; i < argc ; i++ ){
 252                 struct btrfs_ioctl_vol_args args;
 253                 char *path;
 254
 255                 if (!is_block_device(argv[i])) {
 256                         fprintf(stderr,
 257                                 "ERROR: %s is not a block device\n", argv[i]);
 258                         ret = 1;
 259                         goto close_out;
 260                 }
 261                 path = canonicalize_path(argv[i]);
 262                 if (!path) {
 263                         fprintf(stderr,
 264                                 "ERROR: Could not canonicalize path '%s': %s\n",
 265                                 argv[i], strerror(errno));
 266                         ret = 1;
 267                         goto close_out;
 268                 }
 269                 printf("Scanning for Btrfs filesystems in '%s'\n", path);
 270
 271                 strncpy_null(args.name, path);
 272                 /*
 273                  * FIXME: which are the error code returned by this ioctl ?
 274                  * it seems that is impossible to understand if there no is
 275                  * a btrfs filesystem from an I/O error !!!
 276                  */
 277                 ret = ioctl(fd, BTRFS_IOC_SCAN_DEV, &args);
 278                 e = errno;
 279
 280                 if( ret < 0 ){
 281                         fprintf(stderr, "ERROR: unable to scan the device '%s' - %s\n",
 282                                 path, strerror(e));
 283                         free(path);
 284                         goto close_out;
 285                 }
 286                 free(path);
 287         }
 288
 289 close_out:
 290         close(fd);
 291 out:
 292         return !!ret;
 293 }
 294
 295 static const char * const cmd_ready_dev_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_ready_dev(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_ready_dev_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)) {
 327                 fprintf(stderr,
 328                         "ERROR: %s is not a block device\n", path);
 329                 ret = 1;
 330                 goto out;
 331         }
 332
 333         strncpy(args.name, path, BTRFS_PATH_NAME_MAX);
 334         ret = ioctl(fd, BTRFS_IOC_DEVICES_READY, &args);
 335         if (ret < 0) {
 336                 fprintf(stderr, "ERROR: unable to determine if the device '%s'"
 337                         " is ready for mounting - %s\n", path,
 338                         strerror(errno));
 339                 ret = 1;
 340         }
 341
 342 out:
 343         free(path);
 344         close(fd);
 345         return ret;
 346 }
 347
 348 static const char * const cmd_dev_stats_usage[] = {
 349         "btrfs device stats [-z] <path>|<device>",
 350         "Show current device IO stats. -z to reset stats afterwards.",
 351         NULL
 352 };
 353
 354 static int cmd_dev_stats(int argc, char **argv)
 355 {
 356         char *dev_path;
 357         struct btrfs_ioctl_fs_info_args fi_args;
 358         struct btrfs_ioctl_dev_info_args *di_args = NULL;
 359         int ret;
 360         int fdmnt;
 361         int i;
 362         int c;
 363         int err = 0;
 364         __u64 flags = 0;
 365         DIR *dirstream = NULL;
 366
 367         optind = 1;
 368         while ((c = getopt(argc, argv, "z")) != -1) {
 369                 switch (c) {
 370                 case 'z':
 371                         flags = BTRFS_DEV_STATS_RESET;
 372                         break;
 373                 case '?':
 374                 default:
 375                         usage(cmd_dev_stats_usage);
 376                 }
 377         }
 378
 379         argc = argc - optind;
 380         if (check_argc_exact(argc, 1))
 381                 usage(cmd_dev_stats_usage);
 382
 383         dev_path = argv[optind];
 384
 385         fdmnt = open_path_or_dev_mnt(dev_path, &dirstream);
 386
 387         if (fdmnt < 0) {
 388                 if (errno == EINVAL)
 389                         fprintf(stderr,
 390                                 "ERROR: '%s' is not a mounted btrfs device\n",
 391                                 dev_path);
 392                 else
 393                         fprintf(stderr, "ERROR: can't access '%s': %s\n",
 394                                 dev_path, strerror(errno));
 395                 return 1;
 396         }
 397
 398         ret = get_fs_info(dev_path, &fi_args, &di_args);
 399         if (ret) {
 400                 fprintf(stderr, "ERROR: getting dev info for devstats failed: "
 401                                 "%s\n", strerror(-ret));
 402                 err = 1;
 403                 goto out;
 404         }
 405         if (!fi_args.num_devices) {
 406                 fprintf(stderr, "ERROR: no devices found\n");
 407                 err = 1;
 408                 goto out;
 409         }
 410
 411         for (i = 0; i < fi_args.num_devices; i++) {
 412                 struct btrfs_ioctl_get_dev_stats args = {0};
 413                 __u8 path[BTRFS_DEVICE_PATH_NAME_MAX + 1];
 414
 415                 strncpy((char *)path, (char *)di_args[i].path,
 416                         BTRFS_DEVICE_PATH_NAME_MAX);
 417                 path[BTRFS_DEVICE_PATH_NAME_MAX] = '\0';
 418
 419                 args.devid = di_args[i].devid;
 420                 args.nr_items = BTRFS_DEV_STAT_VALUES_MAX;
 421                 args.flags = flags;
 422
 423                 if (ioctl(fdmnt, BTRFS_IOC_GET_DEV_STATS, &args) < 0) {
 424                         fprintf(stderr,
 425                                 "ERROR: ioctl(BTRFS_IOC_GET_DEV_STATS) on %s failed: %s\n",
 426                                 path, strerror(errno));
 427                         err = 1;
 428                 } else {
 429                         if (args.nr_items >= BTRFS_DEV_STAT_WRITE_ERRS + 1)
 430                                 printf("[%s].write_io_errs   %llu\n",
 431                                        path,
 432                                        (unsigned long long) args.values[
 433                                         BTRFS_DEV_STAT_WRITE_ERRS]);
 434                         if (args.nr_items >= BTRFS_DEV_STAT_READ_ERRS + 1)
 435                                 printf("[%s].read_io_errs    %llu\n",
 436                                        path,
 437                                        (unsigned long long) args.values[
 438                                         BTRFS_DEV_STAT_READ_ERRS]);
 439                         if (args.nr_items >= BTRFS_DEV_STAT_FLUSH_ERRS + 1)
 440                                 printf("[%s].flush_io_errs   %llu\n",
 441                                        path,
 442                                        (unsigned long long) args.values[
 443                                         BTRFS_DEV_STAT_FLUSH_ERRS]);
 444                         if (args.nr_items >= BTRFS_DEV_STAT_CORRUPTION_ERRS + 1)
 445                                 printf("[%s].corruption_errs %llu\n",
 446                                        path,
 447                                        (unsigned long long) args.values[
 448                                         BTRFS_DEV_STAT_CORRUPTION_ERRS]);
 449                         if (args.nr_items >= BTRFS_DEV_STAT_GENERATION_ERRS + 1)
 450                                 printf("[%s].generation_errs %llu\n",
 451                                        path,
 452                                        (unsigned long long) args.values[
 453                                         BTRFS_DEV_STAT_GENERATION_ERRS]);
 454                 }
 455         }
 456
 457 out:
 458         free(di_args);
 459         close_file_or_dir(fdmnt, dirstream);
 460
 461         return err;
 462 }
 463
 464 const struct cmd_group device_cmd_group = {
 465         device_cmd_group_usage, NULL, {
 466                 { "add", cmd_add_dev, cmd_add_dev_usage, NULL, 0 },
 467                 { "delete", cmd_rm_dev, cmd_rm_dev_usage, NULL, 0 },
 468                 { "scan", cmd_scan_dev, cmd_scan_dev_usage, NULL, 0 },
 469                 { "ready", cmd_ready_dev, cmd_ready_dev_usage, NULL, 0 },
 470                 { "stats", cmd_dev_stats, cmd_dev_stats_usage, NULL, 0 },
 471                 NULL_CMD_STRUCT
 472         }
 473 };
 474
 475 int cmd_device(int argc, char **argv)
 476 {
 477         return handle_command_group(&device_cmd_group, argc, argv);
 478 }