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
  98                 res = test_dev_for_mkfs(argv[i], force, estr);
  99                 if (res) {
 100                         fprintf(stderr, "%s", estr);
 101                         ret++;
 102                         continue;
 103                 }
 104
 105                 devfd = open(argv[i], O_RDWR);
 106                 if (devfd < 0) {
 107                         fprintf(stderr, "ERROR: Unable to open device '%s'\n", argv[i]);
 108                         ret++;
 109                         continue;
 110                 }
 111
 112                 res = btrfs_prepare_device(devfd, argv[i], 1, &dev_block_count,
 113                                            0, &mixed, discard);
 114                 close(devfd);
 115                 if (res) {
 116                         ret++;
 117                         goto error_out;
 118                 }
 119
 120                 strncpy_null(ioctl_args.name, argv[i]);
 121                 res = ioctl(fdmnt, BTRFS_IOC_ADD_DEV, &ioctl_args);
 122                 e = errno;
 123                 if(res<0){
 124                         fprintf(stderr, "ERROR: error adding the device '%s' - %s\n",
 125                                 argv[i], strerror(e));
 126                         ret++;
 127                 }
 128
 129         }
 130
 131 error_out:
 132         close_file_or_dir(fdmnt, dirstream);
 133         return !!ret;
 134 }
 135
 136 static const char * const cmd_rm_dev_usage[] = {
 137         "btrfs device delete <device> [<device>...] <path>",
 138         "Remove a device from a filesystem",
 139         NULL
 140 };
 141
 142 static int cmd_rm_dev(int argc, char **argv)
 143 {
 144         char    *mntpnt;
 145         int     i, fdmnt, ret=0, e;
 146         DIR     *dirstream = NULL;
 147
 148         if (check_argc_min(argc, 3))
 149                 usage(cmd_rm_dev_usage);
 150
 151         mntpnt = argv[argc - 1];
 152
 153         fdmnt = open_file_or_dir(mntpnt, &dirstream);
 154         if (fdmnt < 0) {
 155                 fprintf(stderr, "ERROR: can't access '%s'\n", mntpnt);
 156                 return 1;
 157         }
 158
 159         for(i=1 ; i < argc - 1; i++ ){
 160                 struct  btrfs_ioctl_vol_args arg;
 161                 int     res;
 162
 163                 if (!is_block_device(argv[i])) {
 164                         fprintf(stderr,
 165                                 "ERROR: %s is not a block device\n", argv[i]);
 166                         ret++;
 167                         continue;
 168                 }
 169                 strncpy_null(arg.name, argv[i]);
 170                 res = ioctl(fdmnt, BTRFS_IOC_RM_DEV, &arg);
 171                 e = errno;
 172                 if (res > 0) {
 173                         fprintf(stderr,
 174                                 "ERROR: error removing the device '%s' - %s\n",
 175                                 argv[i], btrfs_err_str(res));
 176                         ret++;
 177                 } else if (res < 0) {
 178                         fprintf(stderr,
 179                                 "ERROR: error removing the device '%s' - %s\n",
 180                                 argv[i], strerror(e));
 181                         ret++;
 182                 }
 183         }
 184
 185         close_file_or_dir(fdmnt, dirstream);
 186         return !!ret;
 187 }
 188
 189 static const char * const cmd_scan_dev_usage[] = {
 190         "btrfs device scan [options] [<device> [<device>...]]",
 191         "Scan devices for a btrfs filesystem",
 192         "-d|--all-devices    scan all devices under /dev",
 193         NULL
 194 };
 195
 196 static int cmd_scan_dev(int argc, char **argv)
 197 {
 198         int i, fd, e;
 199         int where = BTRFS_SCAN_LBLKID;
 200         int devstart = 1;
 201         int all = 0;
 202         int ret = 0;
 203
 204         optind = 1;
 205         while (1) {
 206                 int long_index;
 207                 static struct option long_options[] = {
 208                         { "all-devices", no_argument, NULL, 'd'},
 209                         { 0, 0, 0, 0 },
 210                 };
 211                 int c = getopt_long(argc, argv, "d", long_options,
 212                                     &long_index);
 213                 if (c < 0)
 214                         break;
 215                 switch (c) {
 216                 case 'd':
 217                         where = BTRFS_SCAN_DEV;
 218                         all = 1;
 219                         break;
 220                 default:
 221                         usage(cmd_scan_dev_usage);
 222                 }
 223         }
 224
 225         if (all && check_argc_max(argc, 2))
 226                 usage(cmd_scan_dev_usage);
 227
 228         if (all || argc == 1) {
 229                 printf("Scanning for Btrfs filesystems\n");
 230                 ret = scan_for_btrfs(where, BTRFS_UPDATE_KERNEL);
 231                 if (ret)
 232                         fprintf(stderr, "ERROR: error %d while scanning\n", ret);
 233                 goto out;
 234         }
 235
 236         fd = open("/dev/btrfs-control", O_RDWR);
 237         if (fd < 0) {
 238                 perror("failed to open /dev/btrfs-control");
 239                 ret = 1;
 240                 goto out;
 241         }
 242
 243         for( i = devstart ; i < argc ; i++ ){
 244                 struct btrfs_ioctl_vol_args args;
 245
 246                 if (!is_block_device(argv[i])) {
 247                         fprintf(stderr,
 248                                 "ERROR: %s is not a block device\n", argv[i]);
 249                         ret = 1;
 250                         goto close_out;
 251                 }
 252                 printf("Scanning for Btrfs filesystems in '%s'\n", argv[i]);
 253
 254                 strncpy_null(args.name, argv[i]);
 255                 /*
 256                  * FIXME: which are the error code returned by this ioctl ?
 257                  * it seems that is impossible to understand if there no is
 258                  * a btrfs filesystem from an I/O error !!!
 259                  */
 260                 ret = ioctl(fd, BTRFS_IOC_SCAN_DEV, &args);
 261                 e = errno;
 262
 263                 if( ret < 0 ){
 264                         fprintf(stderr, "ERROR: unable to scan the device '%s' - %s\n",
 265                                 argv[i], strerror(e));
 266                         goto close_out;
 267                 }
 268         }
 269
 270 close_out:
 271         close(fd);
 272 out:
 273         return !!ret;
 274 }
 275
 276 static const char * const cmd_ready_dev_usage[] = {
 277         "btrfs device ready <device>",
 278         "Check device to see if it has all of it's devices in cache for mounting",
 279         NULL
 280 };
 281
 282 static int cmd_ready_dev(int argc, char **argv)
 283 {
 284         struct  btrfs_ioctl_vol_args args;
 285         int     fd;
 286         int     ret;
 287
 288         if (check_argc_min(argc, 2))
 289                 usage(cmd_ready_dev_usage);
 290
 291         fd = open("/dev/btrfs-control", O_RDWR);
 292         if (fd < 0) {
 293                 perror("failed to open /dev/btrfs-control");
 294                 return 1;
 295         }
 296         if (!is_block_device(argv[1])) {
 297                 fprintf(stderr,
 298                         "ERROR: %s is not a block device\n", argv[1]);
 299                 close(fd);
 300                 return 1;
 301         }
 302
 303         strncpy(args.name, argv[argc - 1], BTRFS_PATH_NAME_MAX);
 304         ret = ioctl(fd, BTRFS_IOC_DEVICES_READY, &args);
 305         if (ret < 0) {
 306                 fprintf(stderr, "ERROR: unable to determine if the device '%s'"
 307                         " is ready for mounting - %s\n", argv[argc - 1],
 308                         strerror(errno));
 309                 ret = 1;
 310         }
 311
 312         close(fd);
 313         return ret;
 314 }
 315
 316 static const char * const cmd_dev_stats_usage[] = {
 317         "btrfs device stats [-z] <path>|<device>",
 318         "Show current device IO stats. -z to reset stats afterwards.",
 319         NULL
 320 };
 321
 322 static int cmd_dev_stats(int argc, char **argv)
 323 {
 324         char *dev_path;
 325         struct btrfs_ioctl_fs_info_args fi_args;
 326         struct btrfs_ioctl_dev_info_args *di_args = NULL;
 327         int ret;
 328         int fdmnt;
 329         int i;
 330         int c;
 331         int err = 0;
 332         __u64 flags = 0;
 333         DIR *dirstream = NULL;
 334
 335         optind = 1;
 336         while ((c = getopt(argc, argv, "z")) != -1) {
 337                 switch (c) {
 338                 case 'z':
 339                         flags = BTRFS_DEV_STATS_RESET;
 340                         break;
 341                 case '?':
 342                 default:
 343                         usage(cmd_dev_stats_usage);
 344                 }
 345         }
 346
 347         argc = argc - optind;
 348         if (check_argc_exact(argc, 1))
 349                 usage(cmd_dev_stats_usage);
 350
 351         dev_path = argv[optind];
 352
 353         fdmnt = open_path_or_dev_mnt(dev_path, &dirstream);
 354
 355         if (fdmnt < 0) {
 356                 fprintf(stderr, "ERROR: can't access '%s'\n", dev_path);
 357                 return 1;
 358         }
 359
 360         ret = get_fs_info(dev_path, &fi_args, &di_args);
 361         if (ret) {
 362                 fprintf(stderr, "ERROR: getting dev info for devstats failed: "
 363                                 "%s\n", strerror(-ret));
 364                 err = 1;
 365                 goto out;
 366         }
 367         if (!fi_args.num_devices) {
 368                 fprintf(stderr, "ERROR: no devices found\n");
 369                 err = 1;
 370                 goto out;
 371         }
 372
 373         for (i = 0; i < fi_args.num_devices; i++) {
 374                 struct btrfs_ioctl_get_dev_stats args = {0};
 375                 __u8 path[BTRFS_DEVICE_PATH_NAME_MAX + 1];
 376
 377                 strncpy((char *)path, (char *)di_args[i].path,
 378                         BTRFS_DEVICE_PATH_NAME_MAX);
 379                 path[BTRFS_DEVICE_PATH_NAME_MAX] = '\0';
 380
 381                 args.devid = di_args[i].devid;
 382                 args.nr_items = BTRFS_DEV_STAT_VALUES_MAX;
 383                 args.flags = flags;
 384
 385                 if (ioctl(fdmnt, BTRFS_IOC_GET_DEV_STATS, &args) < 0) {
 386                         fprintf(stderr,
 387                                 "ERROR: ioctl(BTRFS_IOC_GET_DEV_STATS) on %s failed: %s\n",
 388                                 path, strerror(errno));
 389                         err = 1;
 390                 } else {
 391                         if (args.nr_items >= BTRFS_DEV_STAT_WRITE_ERRS + 1)
 392                                 printf("[%s].write_io_errs   %llu\n",
 393                                        path,
 394                                        (unsigned long long) args.values[
 395                                         BTRFS_DEV_STAT_WRITE_ERRS]);
 396                         if (args.nr_items >= BTRFS_DEV_STAT_READ_ERRS + 1)
 397                                 printf("[%s].read_io_errs    %llu\n",
 398                                        path,
 399                                        (unsigned long long) args.values[
 400                                         BTRFS_DEV_STAT_READ_ERRS]);
 401                         if (args.nr_items >= BTRFS_DEV_STAT_FLUSH_ERRS + 1)
 402                                 printf("[%s].flush_io_errs   %llu\n",
 403                                        path,
 404                                        (unsigned long long) args.values[
 405                                         BTRFS_DEV_STAT_FLUSH_ERRS]);
 406                         if (args.nr_items >= BTRFS_DEV_STAT_CORRUPTION_ERRS + 1)
 407                                 printf("[%s].corruption_errs %llu\n",
 408                                        path,
 409                                        (unsigned long long) args.values[
 410                                         BTRFS_DEV_STAT_CORRUPTION_ERRS]);
 411                         if (args.nr_items >= BTRFS_DEV_STAT_GENERATION_ERRS + 1)
 412                                 printf("[%s].generation_errs %llu\n",
 413                                        path,
 414                                        (unsigned long long) args.values[
 415                                         BTRFS_DEV_STAT_GENERATION_ERRS]);
 416                 }
 417         }
 418
 419 out:
 420         free(di_args);
 421         close_file_or_dir(fdmnt, dirstream);
 422
 423         return err;
 424 }
 425
 426 const struct cmd_group device_cmd_group = {
 427         device_cmd_group_usage, NULL, {
 428                 { "add", cmd_add_dev, cmd_add_dev_usage, NULL, 0 },
 429                 { "delete", cmd_rm_dev, cmd_rm_dev_usage, NULL, 0 },
 430                 { "scan", cmd_scan_dev, cmd_scan_dev_usage, NULL, 0 },
 431                 { "ready", cmd_ready_dev, cmd_ready_dev_usage, NULL, 0 },
 432                 { "stats", cmd_dev_stats, cmd_dev_stats_usage, NULL, 0 },
 433                 NULL_CMD_STRUCT
 434         }
 435 };
 436
 437 int cmd_device(int argc, char **argv)
 438 {
 439         return handle_command_group(&device_cmd_group, argc, argv);
 440 }