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         NULL
 203 };
 204
 205 static int cmd_scan_dev(int argc, char **argv)
 206 {
 207         int i, fd, e;
 208         int where = BTRFS_SCAN_LBLKID;
 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                         where = BTRFS_SCAN_PROC;
 227                         all = 1;
 228                         break;
 229                 default:
 230                         usage(cmd_scan_dev_usage);
 231                 }
 232         }
 233
 234         if (all && check_argc_max(argc, 2))
 235                 usage(cmd_scan_dev_usage);
 236
 237         if (all || argc == 1) {
 238                 printf("Scanning for Btrfs filesystems\n");
 239                 ret = scan_for_btrfs(where, BTRFS_UPDATE_KERNEL);
 240                 if (ret)
 241                         fprintf(stderr, "ERROR: error %d while scanning\n", ret);
 242                 goto out;
 243         }
 244
 245         fd = open("/dev/btrfs-control", O_RDWR);
 246         if (fd < 0) {
 247                 perror("failed to open /dev/btrfs-control");
 248                 ret = 1;
 249                 goto out;
 250         }
 251
 252         for( i = devstart ; i < argc ; i++ ){
 253                 struct btrfs_ioctl_vol_args args;
 254                 char *path;
 255
 256                 if (!is_block_device(argv[i])) {
 257                         fprintf(stderr,
 258                                 "ERROR: %s is not a block device\n", argv[i]);
 259                         ret = 1;
 260                         goto close_out;
 261                 }
 262                 path = canonicalize_path(argv[i]);
 263                 if (!path) {
 264                         fprintf(stderr,
 265                                 "ERROR: Could not canonicalize path '%s': %s\n",
 266                                 argv[i], strerror(errno));
 267                         ret = 1;
 268                         goto close_out;
 269                 }
 270                 printf("Scanning for Btrfs filesystems in '%s'\n", path);
 271
 272                 strncpy_null(args.name, path);
 273                 /*
 274                  * FIXME: which are the error code returned by this ioctl ?
 275                  * it seems that is impossible to understand if there no is
 276                  * a btrfs filesystem from an I/O error !!!
 277                  */
 278                 ret = ioctl(fd, BTRFS_IOC_SCAN_DEV, &args);
 279                 e = errno;
 280
 281                 if( ret < 0 ){
 282                         fprintf(stderr, "ERROR: unable to scan the device '%s' - %s\n",
 283                                 path, strerror(e));
 284                         free(path);
 285                         goto close_out;
 286                 }
 287                 free(path);
 288         }
 289
 290 close_out:
 291         close(fd);
 292 out:
 293         return !!ret;
 294 }
 295
 296 static const char * const cmd_ready_dev_usage[] = {
 297         "btrfs device ready <device>",
 298         "Check device to see if it has all of its devices in cache for mounting",
 299         NULL
 300 };
 301
 302 static int cmd_ready_dev(int argc, char **argv)
 303 {
 304         struct  btrfs_ioctl_vol_args args;
 305         int     fd;
 306         int     ret;
 307         char    *path;
 308
 309         if (check_argc_min(argc, 2))
 310                 usage(cmd_ready_dev_usage);
 311
 312         fd = open("/dev/btrfs-control", O_RDWR);
 313         if (fd < 0) {
 314                 perror("failed to open /dev/btrfs-control");
 315                 return 1;
 316         }
 317
 318         path = canonicalize_path(argv[argc - 1]);
 319         if (!path) {
 320                 fprintf(stderr,
 321                         "ERROR: Could not canonicalize pathname '%s': %s\n",
 322                         argv[argc - 1], strerror(errno));
 323                 ret = 1;
 324                 goto out;
 325         }
 326
 327         if (!is_block_device(path)) {
 328                 fprintf(stderr,
 329                         "ERROR: %s is not a block device\n", path);
 330                 ret = 1;
 331                 goto out;
 332         }
 333
 334         strncpy(args.name, path, BTRFS_PATH_NAME_MAX);
 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_dev_stats_usage[] = {
 350         "btrfs device stats [-z] <path>|<device>",
 351         "Show current device IO stats. -z to reset stats afterwards.",
 352         NULL
 353 };
 354
 355 static int cmd_dev_stats(int argc, char **argv)
 356 {
 357         char *dev_path;
 358         struct btrfs_ioctl_fs_info_args fi_args;
 359         struct btrfs_ioctl_dev_info_args *di_args = NULL;
 360         int ret;
 361         int fdmnt;
 362         int i;
 363         int c;
 364         int err = 0;
 365         __u64 flags = 0;
 366         DIR *dirstream = NULL;
 367
 368         optind = 1;
 369         while ((c = getopt(argc, argv, "z")) != -1) {
 370                 switch (c) {
 371                 case 'z':
 372                         flags = BTRFS_DEV_STATS_RESET;
 373                         break;
 374                 case '?':
 375                 default:
 376                         usage(cmd_dev_stats_usage);
 377                 }
 378         }
 379
 380         argc = argc - optind;
 381         if (check_argc_exact(argc, 1))
 382                 usage(cmd_dev_stats_usage);
 383
 384         dev_path = argv[optind];
 385
 386         fdmnt = open_path_or_dev_mnt(dev_path, &dirstream);
 387
 388         if (fdmnt < 0) {
 389                 if (errno == EINVAL)
 390                         fprintf(stderr,
 391                                 "ERROR: '%s' is not a mounted btrfs device\n",
 392                                 dev_path);
 393                 else
 394                         fprintf(stderr, "ERROR: can't access '%s': %s\n",
 395                                 dev_path, strerror(errno));
 396                 return 1;
 397         }
 398
 399         ret = get_fs_info(dev_path, &fi_args, &di_args);
 400         if (ret) {
 401                 fprintf(stderr, "ERROR: getting dev info for devstats failed: "
 402                                 "%s\n", strerror(-ret));
 403                 err = 1;
 404                 goto out;
 405         }
 406         if (!fi_args.num_devices) {
 407                 fprintf(stderr, "ERROR: no devices found\n");
 408                 err = 1;
 409                 goto out;
 410         }
 411
 412         for (i = 0; i < fi_args.num_devices; i++) {
 413                 struct btrfs_ioctl_get_dev_stats args = {0};
 414                 __u8 path[BTRFS_DEVICE_PATH_NAME_MAX + 1];
 415
 416                 strncpy((char *)path, (char *)di_args[i].path,
 417                         BTRFS_DEVICE_PATH_NAME_MAX);
 418                 path[BTRFS_DEVICE_PATH_NAME_MAX] = '\0';
 419
 420                 args.devid = di_args[i].devid;
 421                 args.nr_items = BTRFS_DEV_STAT_VALUES_MAX;
 422                 args.flags = flags;
 423
 424                 if (ioctl(fdmnt, BTRFS_IOC_GET_DEV_STATS, &args) < 0) {
 425                         fprintf(stderr,
 426                                 "ERROR: ioctl(BTRFS_IOC_GET_DEV_STATS) on %s failed: %s\n",
 427                                 path, strerror(errno));
 428                         err = 1;
 429                 } else {
 430                         if (args.nr_items >= BTRFS_DEV_STAT_WRITE_ERRS + 1)
 431                                 printf("[%s].write_io_errs   %llu\n",
 432                                        path,
 433                                        (unsigned long long) args.values[
 434                                         BTRFS_DEV_STAT_WRITE_ERRS]);
 435                         if (args.nr_items >= BTRFS_DEV_STAT_READ_ERRS + 1)
 436                                 printf("[%s].read_io_errs    %llu\n",
 437                                        path,
 438                                        (unsigned long long) args.values[
 439                                         BTRFS_DEV_STAT_READ_ERRS]);
 440                         if (args.nr_items >= BTRFS_DEV_STAT_FLUSH_ERRS + 1)
 441                                 printf("[%s].flush_io_errs   %llu\n",
 442                                        path,
 443                                        (unsigned long long) args.values[
 444                                         BTRFS_DEV_STAT_FLUSH_ERRS]);
 445                         if (args.nr_items >= BTRFS_DEV_STAT_CORRUPTION_ERRS + 1)
 446                                 printf("[%s].corruption_errs %llu\n",
 447                                        path,
 448                                        (unsigned long long) args.values[
 449                                         BTRFS_DEV_STAT_CORRUPTION_ERRS]);
 450                         if (args.nr_items >= BTRFS_DEV_STAT_GENERATION_ERRS + 1)
 451                                 printf("[%s].generation_errs %llu\n",
 452                                        path,
 453                                        (unsigned long long) args.values[
 454                                         BTRFS_DEV_STAT_GENERATION_ERRS]);
 455                 }
 456         }
 457
 458 out:
 459         free(di_args);
 460         close_file_or_dir(fdmnt, dirstream);
 461
 462         return err;
 463 }
 464
 465 const struct cmd_group device_cmd_group = {
 466         device_cmd_group_usage, NULL, {
 467                 { "add", cmd_add_dev, cmd_add_dev_usage, NULL, 0 },
 468                 { "delete", cmd_rm_dev, cmd_rm_dev_usage, NULL, 0 },
 469                 { "scan", cmd_scan_dev, cmd_scan_dev_usage, NULL, 0 },
 470                 { "ready", cmd_ready_dev, cmd_ready_dev_usage, NULL, 0 },
 471                 { "stats", cmd_dev_stats, cmd_dev_stats_usage, NULL, 0 },
 472                 NULL_CMD_STRUCT
 473         }
 474 };
 475
 476 int cmd_device(int argc, char **argv)
 477 {
 478         return handle_command_group(&device_cmd_group, argc, argv);
 479 }