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