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 #include "help.h"
  30
  31 static const char * const qgroup_cmd_group_usage[] = {
  32         "btrfs qgroup <command> [options] <path>",
  33         NULL
  34 };
  35
  36 static int _cmd_qgroup_assign(int assign, int argc, char **argv,
  37                 const char * const *usage_str)
  38 {
  39         int ret = 0;
  40         int fd;
  41         int rescan = 0;
  42         char *path;
  43         struct btrfs_ioctl_qgroup_assign_args args;
  44         DIR *dirstream = NULL;
  45
  46         if (assign) {
  47                 while (1) {
  48                         enum { GETOPT_VAL_RESCAN = 256, GETOPT_VAL_NO_RESCAN };
  49                         static const struct option long_options[] = {
  50                                 { "rescan", no_argument, NULL,
  51                                         GETOPT_VAL_RESCAN },
  52                                 { "no-rescan", no_argument, NULL,
  53                                         GETOPT_VAL_NO_RESCAN },
  54                                 { NULL, 0, NULL, 0 }
  55                         };
  56                         int c = getopt_long(argc, argv, "", long_options, NULL);
  57
  58                         if (c < 0)
  59                                 break;
  60                         switch (c) {
  61                         case GETOPT_VAL_RESCAN:
  62                                 rescan = 1;
  63                                 break;
  64                         case GETOPT_VAL_NO_RESCAN:
  65                                 rescan = 0;
  66                                 break;
  67                         default:
  68                                 /* Usage printed by the caller */
  69                                 return -1;
  70                         }
  71                 }
  72         } else {
  73                 clean_args_no_options(argc, argv, usage_str);
  74         }
  75
  76         if (check_argc_exact(argc - optind, 3))
  77                 usage(usage_str);
  78
  79         memset(&args, 0, sizeof(args));
  80         args.assign = assign;
  81         args.src = parse_qgroupid(argv[optind]);
  82         args.dst = parse_qgroupid(argv[optind + 1]);
  83
  84         path = argv[optind + 2];
  85
  86         /*
  87          * FIXME src should accept subvol path
  88          */
  89         if (btrfs_qgroup_level(args.src) >= btrfs_qgroup_level(args.dst)) {
  90                 error("bad relation requested: %s", path);
  91                 return 1;
  92         }
  93         fd = btrfs_open_dir(path, &dirstream, 1);
  94         if (fd < 0)
  95                 return 1;
  96
  97         ret = ioctl(fd, BTRFS_IOC_QGROUP_ASSIGN, &args);
  98         if (ret < 0) {
  99                 error("unable to assign quota group: %s", strerror(errno));
 100                 close_file_or_dir(fd, dirstream);
 101                 return 1;
 102         }
 103
 104         /*
 105          * If ret > 0, it means assign caused qgroup data inconsistent state.
 106          * Schedule a quota rescan if requested.
 107          *
 108          * The return value change only happens in newer kernel. But will not
 109          * cause problem since old kernel has a bug that will never clear
 110          * INCONSISTENT bit.
 111          */
 112         if (ret > 0) {
 113                 if (rescan) {
 114                         struct btrfs_ioctl_quota_rescan_args qargs;
 115
 116                         printf("Quota data changed, rescan scheduled\n");
 117                         memset(&qargs, 0, sizeof(qargs));
 118                         ret = ioctl(fd, BTRFS_IOC_QUOTA_RESCAN, &qargs);
 119                         if (ret < 0)
 120                                 error("quota rescan failed: %s",
 121                                         strerror(errno));
 122                 } else {
 123                         warning("quotas may be inconsistent, rescan needed");
 124                 }
 125         }
 126         close_file_or_dir(fd, dirstream);
 127         return ret;
 128 }
 129
 130 static int _cmd_qgroup_create(int create, int argc, char **argv)
 131 {
 132         int ret = 0;
 133         int fd;
 134         int e;
 135         char *path;
 136         struct btrfs_ioctl_qgroup_create_args args;
 137         DIR *dirstream = NULL;
 138
 139         if (check_argc_exact(argc - optind, 2))
 140                 return -1;
 141
 142         memset(&args, 0, sizeof(args));
 143         args.create = create;
 144         args.qgroupid = parse_qgroupid(argv[optind]);
 145         path = argv[optind + 1];
 146
 147         fd = btrfs_open_dir(path, &dirstream, 1);
 148         if (fd < 0)
 149                 return 1;
 150
 151         ret = ioctl(fd, BTRFS_IOC_QGROUP_CREATE, &args);
 152         e = errno;
 153         close_file_or_dir(fd, dirstream);
 154         if (ret < 0) {
 155                 error("unable to %s quota group: %s",
 156                         create ? "create":"destroy", strerror(e));
 157                 return 1;
 158         }
 159         return 0;
 160 }
 161
 162 static int parse_limit(const char *p, unsigned long long *s)
 163 {
 164         char *endptr;
 165         unsigned long long size;
 166         unsigned long long CLEAR_VALUE = -1;
 167
 168         if (strcasecmp(p, "none") == 0) {
 169                 *s = CLEAR_VALUE;
 170                 return 1;
 171         }
 172
 173         if (p[0] == '-')
 174                 return 0;
 175
 176         size = strtoull(p, &endptr, 10);
 177         if (p == endptr)
 178                 return 0;
 179
 180         switch (*endptr) {
 181         case 'T':
 182         case 't':
 183                 size *= 1024;
 184                 /* fallthrough */
 185         case 'G':
 186         case 'g':
 187                 size *= 1024;
 188                 /* fallthrough */
 189         case 'M':
 190         case 'm':
 191                 size *= 1024;
 192                 /* fallthrough */
 193         case 'K':
 194         case 'k':
 195                 size *= 1024;
 196                 ++endptr;
 197                 break;
 198         case 0:
 199                 break;
 200         default:
 201                 return 0;
 202         }
 203
 204         if (*endptr)
 205                 return 0;
 206
 207         *s = size;
 208
 209         return 1;
 210 }
 211
 212 static const char * const cmd_qgroup_assign_usage[] = {
 213         "btrfs qgroup assign [options] <src> <dst> <path>",
 214         "Assign SRC as the child qgroup of DST",
 215         "",
 216         "--rescan       schedule qutoa rescan if needed",
 217         "--no-rescan    don't schedule quota rescan",
 218         NULL
 219 };
 220
 221 static int cmd_qgroup_assign(int argc, char **argv)
 222 {
 223         return _cmd_qgroup_assign(1, argc, argv, cmd_qgroup_assign_usage);
 224 }
 225
 226 static const char * const cmd_qgroup_remove_usage[] = {
 227         "btrfs qgroup remove <src> <dst> <path>",
 228         "Remove a child qgroup SRC from DST.",
 229         NULL
 230 };
 231
 232 static int cmd_qgroup_remove(int argc, char **argv)
 233 {
 234         return _cmd_qgroup_assign(0, argc, argv, cmd_qgroup_remove_usage);
 235 }
 236
 237 static const char * const cmd_qgroup_create_usage[] = {
 238         "btrfs qgroup create <qgroupid> <path>",
 239         "Create a subvolume quota group.",
 240         NULL
 241 };
 242
 243 static int cmd_qgroup_create(int argc, char **argv)
 244 {
 245         int ret;
 246
 247         clean_args_no_options(argc, argv, cmd_qgroup_create_usage);
 248
 249         ret = _cmd_qgroup_create(1, argc, argv);
 250
 251         if (ret < 0)
 252                 usage(cmd_qgroup_create_usage);
 253         return ret;
 254 }
 255
 256 static const char * const cmd_qgroup_destroy_usage[] = {
 257         "btrfs qgroup destroy <qgroupid> <path>",
 258         "Destroy a quota group.",
 259         NULL
 260 };
 261
 262 static int cmd_qgroup_destroy(int argc, char **argv)
 263 {
 264         int ret;
 265
 266         clean_args_no_options(argc, argv, cmd_qgroup_destroy_usage);
 267
 268         ret = _cmd_qgroup_create(0, argc, argv);
 269
 270         if (ret < 0)
 271                 usage(cmd_qgroup_destroy_usage);
 272         return ret;
 273 }
 274
 275 static const char * const cmd_qgroup_show_usage[] = {
 276         "btrfs qgroup show [options] <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         "--sync         force sync of the filesystem before getting info",
 292         NULL
 293 };
 294
 295 static int cmd_qgroup_show(int argc, char **argv)
 296 {
 297         char *path;
 298         int ret = 0;
 299         int fd;
 300         DIR *dirstream = NULL;
 301         u64 qgroupid;
 302         int filter_flag = 0;
 303         unsigned unit_mode;
 304         int sync = 0;
 305
 306         struct btrfs_qgroup_comparer_set *comparer_set;
 307         struct btrfs_qgroup_filter_set *filter_set;
 308         filter_set = btrfs_qgroup_alloc_filter_set();
 309         comparer_set = btrfs_qgroup_alloc_comparer_set();
 310
 311         unit_mode = get_unit_mode_from_arg(&argc, argv, 0);
 312
 313         while (1) {
 314                 int c;
 315                 enum {
 316                         GETOPT_VAL_SORT = 256,
 317                         GETOPT_VAL_SYNC
 318                 };
 319                 static const struct option long_options[] = {
 320                         {"sort", required_argument, NULL, GETOPT_VAL_SORT},
 321                         {"sync", no_argument, NULL, GETOPT_VAL_SYNC},
 322                         { NULL, 0, NULL, 0 }
 323                 };
 324
 325                 c = getopt_long(argc, argv, "pcreFf", long_options, NULL);
 326                 if (c < 0)
 327                         break;
 328                 switch (c) {
 329                 case 'p':
 330                         btrfs_qgroup_setup_print_column(
 331                                 BTRFS_QGROUP_PARENT);
 332                         break;
 333                 case 'c':
 334                         btrfs_qgroup_setup_print_column(
 335                                 BTRFS_QGROUP_CHILD);
 336                         break;
 337                 case 'r':
 338                         btrfs_qgroup_setup_print_column(
 339                                 BTRFS_QGROUP_MAX_RFER);
 340                         break;
 341                 case 'e':
 342                         btrfs_qgroup_setup_print_column(
 343                                 BTRFS_QGROUP_MAX_EXCL);
 344                         break;
 345                 case 'F':
 346                         filter_flag |= 0x1;
 347                         break;
 348                 case 'f':
 349                         filter_flag |= 0x2;
 350                         break;
 351                 case GETOPT_VAL_SORT:
 352                         ret = btrfs_qgroup_parse_sort_string(optarg,
 353                                                              &comparer_set);
 354                         if (ret)
 355                                 usage(cmd_qgroup_show_usage);
 356                         break;
 357                 case GETOPT_VAL_SYNC:
 358                         sync = 1;
 359                         break;
 360                 default:
 361                         usage(cmd_qgroup_show_usage);
 362                 }
 363         }
 364         btrfs_qgroup_setup_units(unit_mode);
 365
 366         if (check_argc_exact(argc - optind, 1))
 367                 usage(cmd_qgroup_show_usage);
 368
 369         path = argv[optind];
 370         fd = btrfs_open_dir(path, &dirstream, 1);
 371         if (fd < 0) {
 372                 free(filter_set);
 373                 free(comparer_set);
 374                 return 1;
 375         }
 376
 377         if (sync) {
 378                 ret = ioctl(fd, BTRFS_IOC_SYNC);
 379                 if (ret < 0)
 380                         warning("sync ioctl failed on '%s': %s", path,
 381                               strerror(errno));
 382         }
 383
 384         if (filter_flag) {
 385                 ret = lookup_path_rootid(fd, &qgroupid);
 386                 if (ret < 0) {
 387                         error("cannot resolve rootid for %s: %s",
 388                                         path, strerror(-ret));
 389                         close_file_or_dir(fd, dirstream);
 390                         goto out;
 391                 }
 392                 if (filter_flag & 0x1)
 393                         btrfs_qgroup_setup_filter(&filter_set,
 394                                         BTRFS_QGROUP_FILTER_ALL_PARENT,
 395                                         qgroupid);
 396                 if (filter_flag & 0x2)
 397                         btrfs_qgroup_setup_filter(&filter_set,
 398                                         BTRFS_QGROUP_FILTER_PARENT,
 399                                         qgroupid);
 400         }
 401         ret = btrfs_show_qgroups(fd, filter_set, comparer_set);
 402         if (ret == -ENOENT)
 403                 error("can't list qgroups: quotas not enabled");
 404         else if (ret < 0)
 405                 error("can't list qgroups: %s", strerror(-ret));
 406         close_file_or_dir(fd, dirstream);
 407
 408 out:
 409         return !!ret;
 410 }
 411
 412 static const char * const cmd_qgroup_limit_usage[] = {
 413         "btrfs qgroup limit [options] <size>|none [<qgroupid>] <path>",
 414         "Set the limits a subvolume quota group.",
 415         "",
 416         "-c   limit amount of data after compression. This is the default,",
 417         "     it is currently not possible to turn off this option.",
 418         "-e   limit space exclusively assigned to this qgroup",
 419         NULL
 420 };
 421
 422 static int cmd_qgroup_limit(int argc, char **argv)
 423 {
 424         int ret = 0;
 425         int fd;
 426         int e;
 427         char *path = NULL;
 428         struct btrfs_ioctl_qgroup_limit_args args;
 429         unsigned long long size;
 430         int compressed = 0;
 431         int exclusive = 0;
 432         DIR *dirstream = NULL;
 433
 434         while (1) {
 435                 int c = getopt(argc, argv, "ce");
 436                 if (c < 0)
 437                         break;
 438                 switch (c) {
 439                 case 'c':
 440                         compressed = 1;
 441                         break;
 442                 case 'e':
 443                         exclusive = 1;
 444                         break;
 445                 default:
 446                         usage(cmd_qgroup_limit_usage);
 447                 }
 448         }
 449
 450         if (check_argc_min(argc - optind, 2))
 451                 usage(cmd_qgroup_limit_usage);
 452
 453         if (!parse_limit(argv[optind], &size)) {
 454                 error("invalid size argument: %s", argv[optind]);
 455                 return 1;
 456         }
 457
 458         memset(&args, 0, sizeof(args));
 459         if (compressed)
 460                 args.lim.flags |= BTRFS_QGROUP_LIMIT_RFER_CMPR |
 461                                   BTRFS_QGROUP_LIMIT_EXCL_CMPR;
 462         if (exclusive) {
 463                 args.lim.flags |= BTRFS_QGROUP_LIMIT_MAX_EXCL;
 464                 args.lim.max_exclusive = size;
 465         } else {
 466                 args.lim.flags |= BTRFS_QGROUP_LIMIT_MAX_RFER;
 467                 args.lim.max_referenced = size;
 468         }
 469
 470         if (argc - optind == 2) {
 471                 args.qgroupid = 0;
 472                 path = argv[optind + 1];
 473                 ret = test_issubvolume(path);
 474                 if (ret < 0) {
 475                         error("cannot access '%s': %s", path, strerror(-ret));
 476                         return 1;
 477                 }
 478                 if (!ret) {
 479                         error("'%s' is not a subvolume", path);
 480                         return 1;
 481                 }
 482                 /*
 483                  * keep qgroupid at 0, this indicates that the subvolume the
 484                  * fd refers to is to be limited
 485                  */
 486         } else if (argc - optind == 3) {
 487                 args.qgroupid = parse_qgroupid(argv[optind + 1]);
 488                 path = argv[optind + 2];
 489         } else
 490                 usage(cmd_qgroup_limit_usage);
 491
 492         fd = btrfs_open_dir(path, &dirstream, 1);
 493         if (fd < 0)
 494                 return 1;
 495
 496         ret = ioctl(fd, BTRFS_IOC_QGROUP_LIMIT, &args);
 497         e = errno;
 498         close_file_or_dir(fd, dirstream);
 499         if (ret < 0) {
 500                 error("unable to limit requested quota group: %s", strerror(e));
 501                 return 1;
 502         }
 503         return 0;
 504 }
 505
 506 static const char qgroup_cmd_group_info[] =
 507 "manage quota groups";
 508
 509 const struct cmd_group qgroup_cmd_group = {
 510         qgroup_cmd_group_usage, qgroup_cmd_group_info, {
 511                 { "assign", cmd_qgroup_assign, cmd_qgroup_assign_usage,
 512                    NULL, 0 },
 513                 { "remove", cmd_qgroup_remove, cmd_qgroup_remove_usage,
 514                    NULL, 0 },
 515                 { "create", cmd_qgroup_create, cmd_qgroup_create_usage,
 516                    NULL, 0 },
 517                 { "destroy", cmd_qgroup_destroy, cmd_qgroup_destroy_usage,
 518                    NULL, 0 },
 519                 { "show", cmd_qgroup_show, cmd_qgroup_show_usage,
 520                    NULL, 0 },
 521                 { "limit", cmd_qgroup_limit, cmd_qgroup_limit_usage,
 522                    NULL, 0 },
 523                 NULL_CMD_STRUCT
 524         }
 525 };
 526
 527 int cmd_qgroup(int argc, char **argv)
 528 {
 529         return handle_command_group(&qgroup_cmd_group, argc, argv);
 530 }