cmds-qgroup.c

   1 /*
   2  * Copyright (C) 2012 STRATO.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public
   6  * License v2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public
  14  * License along with this program; if not, write to the
  15  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  16  * Boston, MA 021110-1307, USA.
  17  */
  18
  19 #include <sys/ioctl.h>
  20 #include <unistd.h>
  21 #include <getopt.h>
  22
  23 #include "ctree.h"
  24 #include "ioctl.h"
  25
  26 #include "commands.h"
  27 #include "qgroup.h"
  28 #include "utils.h"
  29
  30 static const char * const qgroup_cmd_group_usage[] = {
  31         "btrfs qgroup <command> [options] <path>",
  32         NULL
  33 };
  34
  35 static int qgroup_assign(int assign, int argc, char **argv)
  36 {
  37         int ret = 0;
  38         int fd;
  39         int e;
  40         int rescan = 0;
  41         char *path;
  42         struct btrfs_ioctl_qgroup_assign_args args;
  43         DIR *dirstream = NULL;
  44
  45         while (1) {
  46                 enum { GETOPT_VAL_RESCAN = 256 };
  47                 static const struct option long_options[] = {
  48                         { "rescan", no_argument, NULL, GETOPT_VAL_RESCAN },
  49                         { NULL, 0, NULL, 0 }
  50                 };
  51                 int c = getopt_long(argc, argv, "", long_options, NULL);
  52
  53                 if (c < 0)
  54                         break;
  55                 switch (c) {
  56                 case GETOPT_VAL_RESCAN:
  57                         rescan = 1;
  58                         break;
  59                 default:
  60                         /* Usage printed by the caller */
  61                         return -1;
  62                 }
  63         }
  64
  65         if (check_argc_exact(argc - optind, 3))
  66                 return -1;
  67
  68         memset(&args, 0, sizeof(args));
  69         args.assign = assign;
  70         args.src = parse_qgroupid(argv[optind]);
  71         args.dst = parse_qgroupid(argv[optind + 1]);
  72
  73         path = argv[optind + 2];
  74
  75         /*
  76          * FIXME src should accept subvol path
  77          */
  78         if (btrfs_qgroup_level(args.src) >= btrfs_qgroup_level(args.dst)) {
  79                 fprintf(stderr, "ERROR: bad relation requested '%s'\n", path);
  80                 return 1;
  81         }
  82         fd = btrfs_open_dir(path, &dirstream, 1);
  83         if (fd < 0)
  84                 return 1;
  85
  86         ret = ioctl(fd, BTRFS_IOC_QGROUP_ASSIGN, &args);
  87         e = errno;
  88         if (ret < 0) {
  89                 fprintf(stderr, "ERROR: unable to assign quota group: %s\n",
  90                         strerror(e));
  91                 close_file_or_dir(fd, dirstream);
  92                 return 1;
  93         }
  94
  95         /*
  96          * If ret > 0, it means assign caused qgroup data inconsistent state.
  97          * Schedule a quota rescan if requested.
  98          *
  99          * The return value change only happens in newer kernel. But will not
 100          * cause problem since old kernel has a bug that will never clear
 101          * INCONSISTENT bit.
 102          */
 103         if (ret > 0) {
 104                 if (rescan) {
 105                         struct btrfs_ioctl_quota_rescan_args args;
 106
 107                         printf("Quota data changed, rescan scheduled\n");
 108                         memset(&args, 0, sizeof(args));
 109                         ret = ioctl(fd, BTRFS_IOC_QUOTA_RESCAN, &args);
 110                         if (ret < 0)
 111                                 fprintf(stderr,
 112                                         "ERROR: quota rescan failed: %s\n",
 113                                         strerror(errno));
 114                 } else {
 115                         printf("WARNING: quotas may be inconsistent, rescan needed\n");
 116                 }
 117         }
 118         close_file_or_dir(fd, dirstream);
 119         return ret;
 120 }
 121
 122 static int qgroup_create(int create, int argc, char **argv)
 123 {
 124         int ret = 0;
 125         int fd;
 126         int e;
 127         char *path = argv[2];
 128         struct btrfs_ioctl_qgroup_create_args args;
 129         DIR *dirstream = NULL;
 130
 131         if (check_argc_exact(argc, 3))
 132                 return -1;
 133
 134         memset(&args, 0, sizeof(args));
 135         args.create = create;
 136         args.qgroupid = parse_qgroupid(argv[1]);
 137
 138         fd = btrfs_open_dir(path, &dirstream, 1);
 139         if (fd < 0)
 140                 return 1;
 141
 142         ret = ioctl(fd, BTRFS_IOC_QGROUP_CREATE, &args);
 143         e = errno;
 144         close_file_or_dir(fd, dirstream);
 145         if (ret < 0) {
 146                 fprintf(stderr, "ERROR: unable to %s quota group: %s\n",
 147                         create ? "create":"destroy", strerror(e));
 148                 return 1;
 149         }
 150         return 0;
 151 }
 152
 153 static int parse_limit(const char *p, unsigned long long *s)
 154 {
 155         char *endptr;
 156         unsigned long long size;
 157         unsigned long long CLEAR_VALUE = -1;
 158
 159         if (strcasecmp(p, "none") == 0) {
 160                 *s = CLEAR_VALUE;
 161                 return 1;
 162         }
 163
 164         if (p[0] == '-')
 165                 return 0;
 166
 167         size = strtoull(p, &endptr, 10);
 168         if (p == endptr)
 169                 return 0;
 170
 171         switch (*endptr) {
 172         case 'T':
 173         case 't':
 174                 size *= 1024;
 175                 /* fallthrough */
 176         case 'G':
 177         case 'g':
 178                 size *= 1024;
 179                 /* fallthrough */
 180         case 'M':
 181         case 'm':
 182                 size *= 1024;
 183                 /* fallthrough */
 184         case 'K':
 185         case 'k':
 186                 size *= 1024;
 187                 ++endptr;
 188                 break;
 189         case 0:
 190                 break;
 191         default:
 192                 return 0;
 193         }
 194
 195         if (*endptr)
 196                 return 0;
 197
 198         *s = size;
 199
 200         return 1;
 201 }
 202
 203 static const char * const cmd_qgroup_assign_usage[] = {
 204         "btrfs qgroup assign [options] <src> <dst> <path>",
 205         "Assign SRC as the child qgroup of DST",
 206         "",
 207         "--rescan       schedule qutoa rescan if needed",
 208         "--no-rescan    ",
 209         NULL
 210 };
 211
 212 static int cmd_qgroup_assign(int argc, char **argv)
 213 {
 214         int ret = qgroup_assign(1, argc, argv);
 215         if (ret < 0)
 216                 usage(cmd_qgroup_assign_usage);
 217         return ret;
 218 }
 219
 220 static const char * const cmd_qgroup_remove_usage[] = {
 221         "btrfs qgroup remove <src> <dst> <path>",
 222         "Remove a child qgroup SRC from DST.",
 223         NULL
 224 };
 225
 226 static int cmd_qgroup_remove(int argc, char **argv)
 227 {
 228         int ret = qgroup_assign(0, argc, argv);
 229         if (ret < 0)
 230                 usage(cmd_qgroup_remove_usage);
 231         return ret;
 232 }
 233
 234 static const char * const cmd_qgroup_create_usage[] = {
 235         "btrfs qgroup create <qgroupid> <path>",
 236         "Create a subvolume quota group.",
 237         NULL
 238 };
 239
 240 static int cmd_qgroup_create(int argc, char **argv)
 241 {
 242         int ret = qgroup_create(1, argc, argv);
 243         if (ret < 0)
 244                 usage(cmd_qgroup_create_usage);
 245         return ret;
 246 }
 247
 248 static const char * const cmd_qgroup_destroy_usage[] = {
 249         "btrfs qgroup destroy <qgroupid> <path>",
 250         "Destroy a quota group.",
 251         NULL
 252 };
 253
 254 static int cmd_qgroup_destroy(int argc, char **argv)
 255 {
 256         int ret = qgroup_create(0, argc, argv);
 257         if (ret < 0)
 258                 usage(cmd_qgroup_destroy_usage);
 259         return ret;
 260 }
 261
 262 static const char * const cmd_qgroup_show_usage[] = {
 263         "btrfs qgroup show -pcreFf "
 264         "[--sort=qgroupid,rfer,excl,max_rfer,max_excl] <path>",
 265         "Show subvolume quota groups.",
 266         "-p             print parent qgroup id",
 267         "-c             print child qgroup id",
 268         "-r             print limit of referenced size of qgroup",
 269         "-e             print limit of exclusive size of qgroup",
 270         "-F             list all qgroups which impact the given path",
 271         "               (including ancestral qgroups)",
 272         "-f             list all qgroups which impact the given path",
 273         "               (excluding ancestral qgroups)",
 274         HELPINFO_OUTPUT_UNIT,
 275         "--sort=qgroupid,rfer,excl,max_rfer,max_excl",
 276         "               list qgroups sorted by specified items",
 277         "               you can use '+' or '-' in front of each item.",
 278         "               (+:ascending, -:descending, ascending default)",
 279         NULL
 280 };
 281
 282 static int cmd_qgroup_show(int argc, char **argv)
 283 {
 284         char *path;
 285         int ret = 0;
 286         int fd;
 287         int e;
 288         DIR *dirstream = NULL;
 289         u64 qgroupid;
 290         int filter_flag = 0;
 291         unsigned unit_mode;
 292
 293         struct btrfs_qgroup_comparer_set *comparer_set;
 294         struct btrfs_qgroup_filter_set *filter_set;
 295         filter_set = btrfs_qgroup_alloc_filter_set();
 296         comparer_set = btrfs_qgroup_alloc_comparer_set();
 297
 298         unit_mode = get_unit_mode_from_arg(&argc, argv, 0);
 299
 300         optind = 1;
 301         while (1) {
 302                 int c;
 303                 static const struct option long_options[] = {
 304                         {"sort", required_argument, NULL, 'S'},
 305                         { NULL, 0, NULL, 0 }
 306                 };
 307
 308                 c = getopt_long(argc, argv, "pcreFf", long_options, NULL);
 309                 if (c < 0)
 310                         break;
 311                 switch (c) {
 312                 case 'p':
 313                         btrfs_qgroup_setup_print_column(
 314                                 BTRFS_QGROUP_PARENT);
 315                         break;
 316                 case 'c':
 317                         btrfs_qgroup_setup_print_column(
 318                                 BTRFS_QGROUP_CHILD);
 319                         break;
 320                 case 'r':
 321                         btrfs_qgroup_setup_print_column(
 322                                 BTRFS_QGROUP_MAX_RFER);
 323                         break;
 324                 case 'e':
 325                         btrfs_qgroup_setup_print_column(
 326                                 BTRFS_QGROUP_MAX_EXCL);
 327                         break;
 328                 case 'F':
 329                         filter_flag |= 0x1;
 330                         break;
 331                 case 'f':
 332                         filter_flag |= 0x2;
 333                         break;
 334                 case 'S':
 335                         ret = btrfs_qgroup_parse_sort_string(optarg,
 336                                                              &comparer_set);
 337                         if (ret)
 338                                 usage(cmd_qgroup_show_usage);
 339                         break;
 340                 default:
 341                         usage(cmd_qgroup_show_usage);
 342                 }
 343         }
 344         btrfs_qgroup_setup_units(unit_mode);
 345
 346         if (check_argc_exact(argc - optind, 1))
 347                 usage(cmd_qgroup_show_usage);
 348
 349         path = argv[optind];
 350         fd = btrfs_open_dir(path, &dirstream, 1);
 351         if (fd < 0) {
 352                 btrfs_qgroup_free_filter_set(filter_set);
 353                 btrfs_qgroup_free_comparer_set(comparer_set);
 354                 return 1;
 355         }
 356
 357         if (filter_flag) {
 358                 qgroupid = btrfs_get_path_rootid(fd);
 359                 if (filter_flag & 0x1)
 360                         btrfs_qgroup_setup_filter(&filter_set,
 361                                         BTRFS_QGROUP_FILTER_ALL_PARENT,
 362                                         qgroupid);
 363                 if (filter_flag & 0x2)
 364                         btrfs_qgroup_setup_filter(&filter_set,
 365                                         BTRFS_QGROUP_FILTER_PARENT,
 366                                         qgroupid);
 367         }
 368         ret = btrfs_show_qgroups(fd, filter_set, comparer_set);
 369         e = errno;
 370         close_file_or_dir(fd, dirstream);
 371         if (ret < 0)
 372                 fprintf(stderr, "ERROR: can't list qgroups: %s\n",
 373                                 strerror(e));
 374
 375         return !!ret;
 376 }
 377
 378 static const char * const cmd_qgroup_limit_usage[] = {
 379         "btrfs qgroup limit [options] <size>|none [<qgroupid>] <path>",
 380         "Set the limits a subvolume quota group.",
 381         "",
 382         "-c   limit amount of data after compression. This is the default,",
 383         "     it is currently not possible to turn off this option.",
 384         "-e   limit space exclusively assigned to this qgroup",
 385         NULL
 386 };
 387
 388 static int cmd_qgroup_limit(int argc, char **argv)
 389 {
 390         int ret = 0;
 391         int fd;
 392         int e;
 393         char *path = NULL;
 394         struct btrfs_ioctl_qgroup_limit_args args;
 395         unsigned long long size;
 396         int compressed = 0;
 397         int exclusive = 0;
 398         DIR *dirstream = NULL;
 399
 400         optind = 1;
 401         while (1) {
 402                 int c = getopt(argc, argv, "ce");
 403                 if (c < 0)
 404                         break;
 405                 switch (c) {
 406                 case 'c':
 407                         compressed = 1;
 408                         break;
 409                 case 'e':
 410                         exclusive = 1;
 411                         break;
 412                 default:
 413                         usage(cmd_qgroup_limit_usage);
 414                 }
 415         }
 416
 417         if (check_argc_min(argc - optind, 2))
 418                 usage(cmd_qgroup_limit_usage);
 419
 420         if (!parse_limit(argv[optind], &size)) {
 421                 fprintf(stderr, "Invalid size argument given\n");
 422                 return 1;
 423         }
 424
 425         memset(&args, 0, sizeof(args));
 426         if (compressed)
 427                 args.lim.flags |= BTRFS_QGROUP_LIMIT_RFER_CMPR |
 428                                   BTRFS_QGROUP_LIMIT_EXCL_CMPR;
 429         if (exclusive) {
 430                 args.lim.flags |= BTRFS_QGROUP_LIMIT_MAX_EXCL;
 431                 args.lim.max_exclusive = size;
 432         } else {
 433                 args.lim.flags |= BTRFS_QGROUP_LIMIT_MAX_RFER;
 434                 args.lim.max_referenced = size;
 435         }
 436
 437         if (argc - optind == 2) {
 438                 args.qgroupid = 0;
 439                 path = argv[optind + 1];
 440                 ret = test_issubvolume(path);
 441                 if (ret < 0) {
 442                         fprintf(stderr, "ERROR: error accessing '%s'\n", path);
 443                         return 1;
 444                 }
 445                 if (!ret) {
 446                         fprintf(stderr, "ERROR: '%s' is not a subvolume\n",
 447                                 path);
 448                         return 1;
 449                 }
 450                 /*
 451                  * keep qgroupid at 0, this indicates that the subvolume the
 452                  * fd refers to is to be limited
 453                  */
 454         } else if (argc - optind == 3) {
 455                 args.qgroupid = parse_qgroupid(argv[optind + 1]);
 456                 path = argv[optind + 2];
 457         } else
 458                 usage(cmd_qgroup_limit_usage);
 459
 460         fd = btrfs_open_dir(path, &dirstream, 1);
 461         if (fd < 0)
 462                 return 1;
 463
 464         ret = ioctl(fd, BTRFS_IOC_QGROUP_LIMIT, &args);
 465         e = errno;
 466         close_file_or_dir(fd, dirstream);
 467         if (ret < 0) {
 468                 fprintf(stderr, "ERROR: unable to limit requested quota group: "
 469                         "%s\n", strerror(e));
 470                 return 1;
 471         }
 472         return 0;
 473 }
 474
 475 static const char qgroup_cmd_group_info[] =
 476 "manage quota groups";
 477
 478 const struct cmd_group qgroup_cmd_group = {
 479         qgroup_cmd_group_usage, qgroup_cmd_group_info, {
 480                 { "assign", cmd_qgroup_assign, cmd_qgroup_assign_usage,
 481                    NULL, 0 },
 482                 { "remove", cmd_qgroup_remove, cmd_qgroup_remove_usage,
 483                    NULL, 0 },
 484                 { "create", cmd_qgroup_create, cmd_qgroup_create_usage,
 485                    NULL, 0 },
 486                 { "destroy", cmd_qgroup_destroy, cmd_qgroup_destroy_usage,
 487                    NULL, 0 },
 488                 { "show", cmd_qgroup_show, cmd_qgroup_show_usage,
 489                    NULL, 0 },
 490                 { "limit", cmd_qgroup_limit, cmd_qgroup_limit_usage,
 491                    NULL, 0 },
 492                 NULL_CMD_STRUCT
 493         }
 494 };
 495
 496 int cmd_qgroup(int argc, char **argv)
 497 {
 498         return handle_command_group(&qgroup_cmd_group, argc, argv);
 499 }