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 _cmd_qgroup_assign(int assign, int argc, char **argv,
  36                 const char * const *usage_str)
  37 {
  38         int ret = 0;
  39         int fd;
  40         int rescan = 0;
  41         char *path;
  42         struct btrfs_ioctl_qgroup_assign_args args;
  43         DIR *dirstream = NULL;
  44
  45         if (assign) {
  46                 while (1) {
  47                         enum { GETOPT_VAL_RESCAN = 256, GETOPT_VAL_NO_RESCAN };
  48                         static const struct option long_options[] = {
  49                                 { "rescan", no_argument, NULL,
  50                                         GETOPT_VAL_RESCAN },
  51                                 { "no-rescan", no_argument, NULL,
  52                                         GETOPT_VAL_NO_RESCAN },
  53                                 { NULL, 0, NULL, 0 }
  54                         };
  55                         int c = getopt_long(argc, argv, "", long_options, NULL);
  56
  57                         if (c < 0)
  58                                 break;
  59                         switch (c) {
  60                         case GETOPT_VAL_RESCAN:
  61                                 rescan = 1;
  62                                 break;
  63                         case GETOPT_VAL_NO_RESCAN:
  64                                 rescan = 0;
  65                                 break;
  66                         default:
  67                                 /* Usage printed by the caller */
  68                                 return -1;
  69                         }
  70                 }
  71         } else {
  72                 clean_args_no_options(argc, argv, usage_str);
  73         }
  74
  75         if (check_argc_exact(argc - optind, 3))
  76                 usage(usage_str);
  77
  78         memset(&args, 0, sizeof(args));
  79         args.assign = assign;
  80         args.src = parse_qgroupid(argv[optind]);
  81         args.dst = parse_qgroupid(argv[optind + 1]);
  82
  83         path = argv[optind + 2];
  84
  85         /*
  86          * FIXME src should accept subvol path
  87          */
  88         if (btrfs_qgroup_level(args.src) >= btrfs_qgroup_level(args.dst)) {
  89                 error("bad relation requested: %s", path);
  90                 return 1;
  91         }
  92         fd = btrfs_open_dir(path, &dirstream, 1);
  93         if (fd < 0)
  94                 return 1;
  95
  96         ret = ioctl(fd, BTRFS_IOC_QGROUP_ASSIGN, &args);
  97         if (ret < 0) {
  98                 error("unable to assign quota group: %s", strerror(errno));
  99                 close_file_or_dir(fd, dirstream);
 100                 return 1;
 101         }
 102
 103         /*
 104          * If ret > 0, it means assign caused qgroup data inconsistent state.
 105          * Schedule a quota rescan if requested.
 106          *
 107          * The return value change only happens in newer kernel. But will not
 108          * cause problem since old kernel has a bug that will never clear
 109          * INCONSISTENT bit.
 110          */
 111         if (ret > 0) {
 112                 if (rescan) {
 113                         struct btrfs_ioctl_quota_rescan_args qargs;
 114
 115                         printf("Quota data changed, rescan scheduled\n");
 116                         memset(&qargs, 0, sizeof(qargs));
 117                         ret = ioctl(fd, BTRFS_IOC_QUOTA_RESCAN, &qargs);
 118                         if (ret < 0)
 119                                 error("quota rescan failed: %s",
 120                                         strerror(errno));
 121                 } else {
 122                         warning("quotas may be inconsistent, rescan needed");
 123                 }
 124         }
 125         close_file_or_dir(fd, dirstream);
 126         return ret;
 127 }
 128
 129 static int _cmd_qgroup_create(int create, int argc, char **argv)
 130 {
 131         int ret = 0;
 132         int fd;
 133         int e;
 134         char *path;
 135         struct btrfs_ioctl_qgroup_create_args args;
 136         DIR *dirstream = NULL;
 137
 138         if (check_argc_exact(argc - optind, 2))
 139                 return -1;
 140
 141         memset(&args, 0, sizeof(args));
 142         args.create = create;
 143         args.qgroupid = parse_qgroupid(argv[optind]);
 144         path = argv[optind + 1];
 145
 146         fd = btrfs_open_dir(path, &dirstream, 1);
 147         if (fd < 0)
 148                 return 1;
 149
 150         ret = ioctl(fd, BTRFS_IOC_QGROUP_CREATE, &args);
 151         e = errno;
 152         close_file_or_dir(fd, dirstream);
 153         if (ret < 0) {
 154                 error("unable to %s quota group: %s",
 155                         create ? "create":"destroy", strerror(e));
 156                 return 1;
 157         }
 158         return 0;
 159 }
 160
 161 static int parse_limit(const char *p, unsigned long long *s)
 162 {
 163         char *endptr;
 164         unsigned long long size;
 165         unsigned long long CLEAR_VALUE = -1;
 166
 167         if (strcasecmp(p, "none") == 0) {
 168                 *s = CLEAR_VALUE;
 169                 return 1;
 170         }
 171
 172         if (p[0] == '-')
 173                 return 0;
 174
 175         size = strtoull(p, &endptr, 10);
 176         if (p == endptr)
 177                 return 0;
 178
 179         switch (*endptr) {
 180         case 'T':
 181         case 't':
 182                 size *= 1024;
 183                 /* fallthrough */
 184         case 'G':
 185         case 'g':
 186                 size *= 1024;
 187                 /* fallthrough */
 188         case 'M':
 189         case 'm':
 190                 size *= 1024;
 191                 /* fallthrough */
 192         case 'K':
 193         case 'k':
 194                 size *= 1024;
 195                 ++endptr;
 196                 break;
 197         case 0:
 198                 break;
 199         default:
 200                 return 0;
 201         }
 202
 203         if (*endptr)
 204                 return 0;
 205
 206         *s = size;
 207
 208         return 1;
 209 }
 210
 211 static const char * const cmd_qgroup_assign_usage[] = {
 212         "btrfs qgroup assign [options] <src> <dst> <path>",
 213         "Assign SRC as the child qgroup of DST",
 214         "",
 215         "--rescan       schedule qutoa rescan if needed",
 216         "--no-rescan    don't schedule quota rescan",
 217         NULL
 218 };
 219
 220 static int cmd_qgroup_assign(int argc, char **argv)
 221 {
 222         return _cmd_qgroup_assign(1, argc, argv, cmd_qgroup_assign_usage);
 223 }
 224
 225 static const char * const cmd_qgroup_remove_usage[] = {
 226         "btrfs qgroup remove <src> <dst> <path>",
 227         "Remove a child qgroup SRC from DST.",
 228         NULL
 229 };
 230
 231 static int cmd_qgroup_remove(int argc, char **argv)
 232 {
 233         return _cmd_qgroup_assign(0, argc, argv, cmd_qgroup_remove_usage);
 234 }
 235
 236 static const char * const cmd_qgroup_create_usage[] = {
 237         "btrfs qgroup create <qgroupid> <path>",
 238         "Create a subvolume quota group.",
 239         NULL
 240 };
 241
 242 static int cmd_qgroup_create(int argc, char **argv)
 243 {
 244         int ret;
 245
 246         clean_args_no_options(argc, argv, cmd_qgroup_create_usage);
 247
 248         ret = _cmd_qgroup_create(1, argc, argv);
 249
 250         if (ret < 0)
 251                 usage(cmd_qgroup_create_usage);
 252         return ret;
 253 }
 254
 255 static const char * const cmd_qgroup_destroy_usage[] = {
 256         "btrfs qgroup destroy <qgroupid> <path>",
 257         "Destroy a quota group.",
 258         NULL
 259 };
 260
 261 static int cmd_qgroup_destroy(int argc, char **argv)
 262 {
 263         int ret;
 264
 265         clean_args_no_options(argc, argv, cmd_qgroup_destroy_usage);
 266
 267         ret = _cmd_qgroup_create(0, argc, argv);
 268
 269         if (ret < 0)
 270                 usage(cmd_qgroup_destroy_usage);
 271         return ret;
 272 }
 273
 274 static const char * const cmd_qgroup_show_usage[] = {
 275         "btrfs qgroup show -pcreFf "
 276         "[--sort=qgroupid,rfer,excl,max_rfer,max_excl] <path>",
 277         "Show subvolume quota groups.",
 278         "-p             print parent qgroup id",
 279         "-c             print child qgroup id",
 280         "-r             print limit of referenced size of qgroup",
 281         "-e             print limit of exclusive size of qgroup",
 282         "-F             list all qgroups which impact the given path",
 283         "               (including ancestral qgroups)",
 284         "-f             list all qgroups which impact the given path",
 285         "               (excluding ancestral qgroups)",
 286         HELPINFO_UNITS_LONG,
 287         "--sort=qgroupid,rfer,excl,max_rfer,max_excl",
 288         "               list qgroups sorted by specified items",
 289         "               you can use '+' or '-' in front of each item.",
 290         "               (+:ascending, -:descending, ascending default)",
 291         NULL
 292 };
 293
 294 static int cmd_qgroup_show(int argc, char **argv)
 295 {
 296         char *path;
 297         int ret = 0;
 298         int fd;
 299         int e;
 300         DIR *dirstream = NULL;
 301         u64 qgroupid;
 302         int filter_flag = 0;
 303         unsigned unit_mode;
 304
 305         struct btrfs_qgroup_comparer_set *comparer_set;
 306         struct btrfs_qgroup_filter_set *filter_set;
 307         filter_set = btrfs_qgroup_alloc_filter_set();
 308         comparer_set = btrfs_qgroup_alloc_comparer_set();
 309
 310         unit_mode = get_unit_mode_from_arg(&argc, argv, 0);
 311
 312         optind = 1;
 313         while (1) {
 314                 int c;
 315                 static const struct option long_options[] = {
 316                         {"sort", required_argument, NULL, 'S'},
 317                         { NULL, 0, NULL, 0 }
 318                 };
 319
 320                 c = getopt_long(argc, argv, "pcreFf", long_options, NULL);
 321                 if (c < 0)
 322                         break;
 323                 switch (c) {
 324                 case 'p':
 325                         btrfs_qgroup_setup_print_column(
 326                                 BTRFS_QGROUP_PARENT);
 327                         break;
 328                 case 'c':
 329                         btrfs_qgroup_setup_print_column(
 330                                 BTRFS_QGROUP_CHILD);
 331                         break;
 332                 case 'r':
 333                         btrfs_qgroup_setup_print_column(
 334                                 BTRFS_QGROUP_MAX_RFER);
 335                         break;
 336                 case 'e':
 337                         btrfs_qgroup_setup_print_column(
 338                                 BTRFS_QGROUP_MAX_EXCL);
 339                         break;
 340                 case 'F':
 341                         filter_flag |= 0x1;
 342                         break;
 343                 case 'f':
 344                         filter_flag |= 0x2;
 345                         break;
 346                 case 'S':
 347                         ret = btrfs_qgroup_parse_sort_string(optarg,
 348                                                              &comparer_set);
 349                         if (ret)
 350                                 usage(cmd_qgroup_show_usage);
 351                         break;
 352                 default:
 353                         usage(cmd_qgroup_show_usage);
 354                 }
 355         }
 356         btrfs_qgroup_setup_units(unit_mode);
 357
 358         if (check_argc_exact(argc - optind, 1))
 359                 usage(cmd_qgroup_show_usage);
 360
 361         path = argv[optind];
 362         fd = btrfs_open_dir(path, &dirstream, 1);
 363         if (fd < 0) {
 364                 btrfs_qgroup_free_filter_set(filter_set);
 365                 btrfs_qgroup_free_comparer_set(comparer_set);
 366                 return 1;
 367         }
 368
 369         if (filter_flag) {
 370                 qgroupid = btrfs_get_path_rootid(fd);
 371                 if (filter_flag & 0x1)
 372                         btrfs_qgroup_setup_filter(&filter_set,
 373                                         BTRFS_QGROUP_FILTER_ALL_PARENT,
 374                                         qgroupid);
 375                 if (filter_flag & 0x2)
 376                         btrfs_qgroup_setup_filter(&filter_set,
 377                                         BTRFS_QGROUP_FILTER_PARENT,
 378                                         qgroupid);
 379         }
 380         ret = btrfs_show_qgroups(fd, filter_set, comparer_set);
 381         e = errno;
 382         close_file_or_dir(fd, dirstream);
 383         if (ret < 0)
 384                 error("can't list qgroups: %s", strerror(e));
 385
 386         return !!ret;
 387 }
 388
 389 static const char * const cmd_qgroup_limit_usage[] = {
 390         "btrfs qgroup limit [options] <size>|none [<qgroupid>] <path>",
 391         "Set the limits a subvolume quota group.",
 392         "",
 393         "-c   limit amount of data after compression. This is the default,",
 394         "     it is currently not possible to turn off this option.",
 395         "-e   limit space exclusively assigned to this qgroup",
 396         NULL
 397 };
 398
 399 static int cmd_qgroup_limit(int argc, char **argv)
 400 {
 401         int ret = 0;
 402         int fd;
 403         int e;
 404         char *path = NULL;
 405         struct btrfs_ioctl_qgroup_limit_args args;
 406         unsigned long long size;
 407         int compressed = 0;
 408         int exclusive = 0;
 409         DIR *dirstream = NULL;
 410
 411         optind = 1;
 412         while (1) {
 413                 int c = getopt(argc, argv, "ce");
 414                 if (c < 0)
 415                         break;
 416                 switch (c) {
 417                 case 'c':
 418                         compressed = 1;
 419                         break;
 420                 case 'e':
 421                         exclusive = 1;
 422                         break;
 423                 default:
 424                         usage(cmd_qgroup_limit_usage);
 425                 }
 426         }
 427
 428         if (check_argc_min(argc - optind, 2))
 429                 usage(cmd_qgroup_limit_usage);
 430
 431         if (!parse_limit(argv[optind], &size)) {
 432                 error("invalid size argument: %s", argv[optind]);
 433                 return 1;
 434         }
 435
 436         memset(&args, 0, sizeof(args));
 437         if (compressed)
 438                 args.lim.flags |= BTRFS_QGROUP_LIMIT_RFER_CMPR |
 439                                   BTRFS_QGROUP_LIMIT_EXCL_CMPR;
 440         if (exclusive) {
 441                 args.lim.flags |= BTRFS_QGROUP_LIMIT_MAX_EXCL;
 442                 args.lim.max_exclusive = size;
 443         } else {
 444                 args.lim.flags |= BTRFS_QGROUP_LIMIT_MAX_RFER;
 445                 args.lim.max_referenced = size;
 446         }
 447
 448         if (argc - optind == 2) {
 449                 args.qgroupid = 0;
 450                 path = argv[optind + 1];
 451                 ret = test_issubvolume(path);
 452                 if (ret < 0) {
 453                         error("cannot access '%s': %s", path, strerror(-ret));
 454                         return 1;
 455                 }
 456                 if (!ret) {
 457                         error("'%s' is not a subvolume", path);
 458                         return 1;
 459                 }
 460                 /*
 461                  * keep qgroupid at 0, this indicates that the subvolume the
 462                  * fd refers to is to be limited
 463                  */
 464         } else if (argc - optind == 3) {
 465                 args.qgroupid = parse_qgroupid(argv[optind + 1]);
 466                 path = argv[optind + 2];
 467         } else
 468                 usage(cmd_qgroup_limit_usage);
 469
 470         fd = btrfs_open_dir(path, &dirstream, 1);
 471         if (fd < 0)
 472                 return 1;
 473
 474         ret = ioctl(fd, BTRFS_IOC_QGROUP_LIMIT, &args);
 475         e = errno;
 476         close_file_or_dir(fd, dirstream);
 477         if (ret < 0) {
 478                 error("unable to limit requested quota group: %s", strerror(e));
 479                 return 1;
 480         }
 481         return 0;
 482 }
 483
 484 static const char qgroup_cmd_group_info[] =
 485 "manage quota groups";
 486
 487 const struct cmd_group qgroup_cmd_group = {
 488         qgroup_cmd_group_usage, qgroup_cmd_group_info, {
 489                 { "assign", cmd_qgroup_assign, cmd_qgroup_assign_usage,
 490                    NULL, 0 },
 491                 { "remove", cmd_qgroup_remove, cmd_qgroup_remove_usage,
 492                    NULL, 0 },
 493                 { "create", cmd_qgroup_create, cmd_qgroup_create_usage,
 494                    NULL, 0 },
 495                 { "destroy", cmd_qgroup_destroy, cmd_qgroup_destroy_usage,
 496                    NULL, 0 },
 497                 { "show", cmd_qgroup_show, cmd_qgroup_show_usage,
 498                    NULL, 0 },
 499                 { "limit", cmd_qgroup_limit, cmd_qgroup_limit_usage,
 500                    NULL, 0 },
 501                 NULL_CMD_STRUCT
 502         }
 503 };
 504
 505 int cmd_qgroup(int argc, char **argv)
 506 {
 507         return handle_command_group(&qgroup_cmd_group, argc, argv);
 508 }