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