tools/lvresize.c

   1 /*
   2  * Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
   3  * Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
   4  *
   5  * This file is part of LVM2.
   6  *
   7  * This copyrighted material is made available to anyone wishing to use,
   8  * modify, copy, or redistribute it subject to the terms and conditions
   9  * of the GNU Lesser General Public License v.2.1.
  10  *
  11  * You should have received a copy of the GNU Lesser General Public License
  12  * along with this program; if not, write to the Free Software Foundation,
  13  * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  14  */
  15
  16 #include "tools.h"
  17
  18 #define SIZE_BUF 128
  19
  20 struct lvresize_params {
  21         const char *vg_name;
  22         const char *lv_name;
  23
  24         uint32_t stripes;
  25         uint32_t stripe_size;
  26         uint32_t mirrors;
  27
  28         const struct segment_type *segtype;
  29
  30         /* size */
  31         uint32_t extents;
  32         uint64_t size;
  33         sign_t sign;
  34         percent_type_t percent;
  35
  36         enum {
  37                 LV_ANY = 0,
  38                 LV_REDUCE = 1,
  39                 LV_EXTEND = 2
  40         } resize;
  41
  42         int resizefs;
  43         int nofsck;
  44
  45         int argc;
  46         char **argv;
  47 };
  48
  49 static int _validate_stripesize(struct cmd_context *cmd,
  50                                 const struct volume_group *vg,
  51                                 struct lvresize_params *lp)
  52 {
  53         if (arg_sign_value(cmd, stripesize_ARG, 0) == SIGN_MINUS) {
  54                 log_error("Stripesize may not be negative.");
  55                 return 0;
  56         }
  57
  58         if (arg_uint64_value(cmd, stripesize_ARG, 0) > STRIPE_SIZE_LIMIT * 2) {
  59                 log_error("Stripe size cannot be larger than %s",
  60                           display_size(cmd, (uint64_t) STRIPE_SIZE_LIMIT));
  61                 return 0;
  62         }
  63
  64         if (!(vg->fid->fmt->features & FMT_SEGMENTS))
  65                 log_warn("Varied stripesize not supported. Ignoring.");
  66         else if (arg_uint_value(cmd, stripesize_ARG, 0) > vg->extent_size * 2) {
  67                 log_error("Reducing stripe size %s to maximum, "
  68                           "physical extent size %s",
  69                           display_size(cmd,
  70                                        (uint64_t) arg_uint_value(cmd, stripesize_ARG, 0)),
  71                           display_size(cmd, (uint64_t) vg->extent_size));
  72                 lp->stripe_size = vg->extent_size;
  73         } else
  74                 lp->stripe_size = arg_uint_value(cmd, stripesize_ARG, 0);
  75
  76         if (lp->stripe_size & (lp->stripe_size - 1)) {
  77                 log_error("Stripe size must be power of 2");
  78                 return 0;
  79         }
  80
  81         return 1;
  82 }
  83
  84 static int _request_confirmation(struct cmd_context *cmd,
  85                                  const struct volume_group *vg,
  86                                  const struct logical_volume *lv,
  87                                  const struct lvresize_params *lp)
  88 {
  89         struct lvinfo info;
  90
  91         memset(&info, 0, sizeof(info));
  92
  93         if (!lv_info(cmd, lv, 0, &info, 1, 0) && driver_version(NULL, 0)) {
  94                 log_error("lv_info failed: aborting");
  95                 return 0;
  96         }
  97
  98         if (lp->resizefs) {
  99                 if (!info.exists) {
 100                         log_error("Logical volume %s must be activated "
 101                                   "before resizing filesystem", lp->lv_name);
 102                         return 0;
 103                 }
 104                 return 1;
 105         }
 106
 107         if (!info.exists)
 108                 return 1;
 109
 110         log_warn("WARNING: Reducing active%s logical volume to %s",
 111                  info.open_count ? " and open" : "",
 112                  display_size(cmd, (uint64_t) lp->extents * vg->extent_size));
 113
 114         log_warn("THIS MAY DESTROY YOUR DATA (filesystem etc.)");
 115
 116         if (!arg_count(cmd, force_ARG)) {
 117                 if (yes_no_prompt("Do you really want to reduce %s? [y/n]: ",
 118                                   lp->lv_name) == 'n') {
 119                         log_error("Logical volume %s NOT reduced", lp->lv_name);
 120                         return 0;
 121                 }
 122                 if (sigint_caught())
 123                         return 0;
 124         }
 125
 126         return 1;
 127 }
 128
 129 enum fsadm_cmd_e { FSADM_CMD_CHECK, FSADM_CMD_RESIZE };
 130 #define FSADM_CMD "fsadm"
 131 #define FSADM_CMD_MAX_ARGS 6
 132 #define FSADM_CHECK_FAILS_FOR_MOUNTED 3 /* shell exist status code */
 133
 134 /*
 135  * FSADM_CMD --dry-run --verbose --force check lv_path
 136  * FSADM_CMD --dry-run --verbose --force resize lv_path size
 137  */
 138 static int _fsadm_cmd(struct cmd_context *cmd,
 139                       const struct volume_group *vg,
 140                       const struct lvresize_params *lp,
 141                       enum fsadm_cmd_e fcmd,
 142                       int *status)
 143 {
 144         char lv_path[PATH_MAX];
 145         char size_buf[SIZE_BUF];
 146         const char *argv[FSADM_CMD_MAX_ARGS + 2];
 147         unsigned i = 0;
 148
 149         argv[i++] = FSADM_CMD;
 150
 151         if (test_mode())
 152                 argv[i++] = "--dry-run";
 153
 154         if (verbose_level() >= _LOG_NOTICE)
 155                 argv[i++] = "--verbose";
 156
 157         if (arg_count(cmd, force_ARG))
 158                 argv[i++] = "--force";
 159
 160         argv[i++] = (fcmd == FSADM_CMD_RESIZE) ? "resize" : "check";
 161
 162         if (dm_snprintf(lv_path, PATH_MAX, "%s%s/%s", cmd->dev_dir, lp->vg_name,
 163                         lp->lv_name) < 0) {
 164                 log_error("Couldn't create LV path for %s", lp->lv_name);
 165                 return 0;
 166         }
 167
 168         argv[i++] = lv_path;
 169
 170         if (fcmd == FSADM_CMD_RESIZE) {
 171                 if (dm_snprintf(size_buf, SIZE_BUF, "%" PRIu64 "K",
 172                                 (uint64_t) lp->extents * vg->extent_size / 2) < 0) {
 173                         log_error("Couldn't generate new LV size string");
 174                         return 0;
 175                 }
 176
 177                 argv[i++] = size_buf;
 178         }
 179
 180         argv[i] = NULL;
 181
 182         return exec_cmd(cmd, argv, status, 1);
 183 }
 184
 185 static int _lvresize_params(struct cmd_context *cmd, int argc, char **argv,
 186                             struct lvresize_params *lp)
 187 {
 188         const char *cmd_name;
 189         char *st;
 190         unsigned dev_dir_found = 0;
 191         int use_policy = arg_count(cmd, use_policies_ARG);
 192
 193         lp->sign = SIGN_NONE;
 194         lp->resize = LV_ANY;
 195
 196         cmd_name = command_name(cmd);
 197         if (!strcmp(cmd_name, "lvreduce"))
 198                 lp->resize = LV_REDUCE;
 199         if (!strcmp(cmd_name, "lvextend"))
 200                 lp->resize = LV_EXTEND;
 201
 202         if (use_policy) {
 203                 /* do nothing; _lvresize will handle --use-policies itself */
 204                 lp->extents = 0;
 205                 lp->sign = SIGN_PLUS;
 206                 lp->percent = PERCENT_LV;
 207         } else {
 208                 /*
 209                  * Allow omission of extents and size if the user has given us
 210                  * one or more PVs.  Most likely, the intent was "resize this
 211                  * LV the best you can with these PVs"
 212                  */
 213                 if ((arg_count(cmd, extents_ARG) + arg_count(cmd, size_ARG) == 0) &&
 214                     (argc >= 2)) {
 215                         lp->extents = 100;
 216                         lp->percent = PERCENT_PVS;
 217                         lp->sign = SIGN_PLUS;
 218                 } else if ((arg_count(cmd, extents_ARG) +
 219                             arg_count(cmd, size_ARG) != 1)) {
 220                         log_error("Please specify either size or extents but not "
 221                                   "both.");
 222                         return 0;
 223                 }
 224
 225                 if (arg_count(cmd, extents_ARG)) {
 226                         lp->extents = arg_uint_value(cmd, extents_ARG, 0);
 227                         lp->sign = arg_sign_value(cmd, extents_ARG, SIGN_NONE);
 228                         lp->percent = arg_percent_value(cmd, extents_ARG, PERCENT_NONE);
 229                 }
 230
 231                 /* Size returned in kilobyte units; held in sectors */
 232                 if (arg_count(cmd, size_ARG)) {
 233                         lp->size = arg_uint64_value(cmd, size_ARG, 0);
 234                         lp->sign = arg_sign_value(cmd, size_ARG, SIGN_NONE);
 235                         lp->percent = PERCENT_NONE;
 236                 }
 237         }
 238
 239         if (lp->resize == LV_EXTEND && lp->sign == SIGN_MINUS) {
 240                 log_error("Negative argument not permitted - use lvreduce");
 241                 return 0;
 242         }
 243
 244         if (lp->resize == LV_REDUCE && lp->sign == SIGN_PLUS) {
 245                 log_error("Positive sign not permitted - use lvextend");
 246                 return 0;
 247         }
 248
 249         lp->resizefs = arg_is_set(cmd, resizefs_ARG);
 250         lp->nofsck = arg_is_set(cmd, nofsck_ARG);
 251
 252         if (!argc) {
 253                 log_error("Please provide the logical volume name");
 254                 return 0;
 255         }
 256
 257         lp->lv_name = argv[0];
 258         argv++;
 259         argc--;
 260
 261         if (!(lp->lv_name = skip_dev_dir(cmd, lp->lv_name, &dev_dir_found)) ||
 262             !(lp->vg_name = extract_vgname(cmd, lp->lv_name))) {
 263                 log_error("Please provide a volume group name");
 264                 return 0;
 265         }
 266
 267         if (!validate_name(lp->vg_name)) {
 268                 log_error("Volume group name %s has invalid characters",
 269                           lp->vg_name);
 270                 return 0;
 271         }
 272
 273         if ((st = strrchr(lp->lv_name, '/')))
 274                 lp->lv_name = st + 1;
 275
 276         lp->argc = argc;
 277         lp->argv = argv;
 278
 279         return 1;
 280 }
 281
 282 static int _adjust_policy_params(struct cmd_context *cmd,
 283                                  struct logical_volume *lv, struct lvresize_params *lp)
 284 {
 285         percent_t percent;
 286         int policy_threshold, policy_amount;
 287
 288         if (lv_is_thin_pool(lv)) {
 289                 policy_threshold =
 290                         find_config_tree_int(cmd, "activation/thin_pool_autoextend_threshold",
 291                                              DEFAULT_THIN_POOL_AUTOEXTEND_THRESHOLD) * PERCENT_1;
 292                 policy_amount =
 293                         find_config_tree_int(cmd, "activation/thin_pool_autoextend_percent",
 294                                              DEFAULT_THIN_POOL_AUTOEXTEND_PERCENT);
 295         } else {
 296                 policy_threshold =
 297                         find_config_tree_int(cmd, "activation/snapshot_autoextend_threshold",
 298                                              DEFAULT_SNAPSHOT_AUTOEXTEND_THRESHOLD) * PERCENT_1;
 299                 policy_amount =
 300                         find_config_tree_int(cmd, "activation/snapshot_autoextend_percent",
 301                                              DEFAULT_SNAPSHOT_AUTOEXTEND_PERCENT);
 302         }
 303
 304         if (policy_threshold >= PERCENT_100)
 305                 return 1; /* nothing to do */
 306
 307         if (lv_is_thin_pool(lv)) {
 308                 if (!lv_thin_pool_percent(lv, &percent))
 309                         return_0;
 310                 if (!(PERCENT_0 < percent && percent <= PERCENT_100) ||
 311                     percent <= policy_threshold)
 312                         return 1; /* nothing to do */
 313         } else {
 314                 if (!lv_snapshot_percent(lv, &percent))
 315                         return_0;
 316                 if (!(PERCENT_0 < percent && percent < PERCENT_100) || percent <= policy_threshold)
 317                         return 1; /* nothing to do */
 318         }
 319
 320         lp->extents = policy_amount;
 321
 322         return 1;
 323 }
 324
 325 static uint32_t lvseg_get_stripes(struct lv_segment *seg, uint32_t *stripesize)
 326 {
 327         uint32_t s;
 328         struct lv_segment *seg_mirr;
 329
 330         /* If segment mirrored, check if images are striped */
 331         if (seg_is_mirrored(seg))
 332                 for (s = 0; s < seg->area_count; s++) {
 333                         if (seg_type(seg, s) != AREA_LV)
 334                                 continue;
 335                         seg_mirr = first_seg(seg_lv(seg, s));
 336
 337                         if (seg_is_striped(seg_mirr)) {
 338                                 seg = seg_mirr;
 339                                 break;
 340                         }
 341                 }
 342
 343
 344         if (seg_is_striped(seg)) {
 345                 *stripesize = seg->stripe_size;
 346                 return seg->area_count;
 347         }
 348
 349         *stripesize = 0;
 350         return 0;
 351 }
 352
 353 static int _lvresize(struct cmd_context *cmd, struct volume_group *vg,
 354                      struct lvresize_params *lp)
 355 {
 356         struct logical_volume *lv;
 357         struct lvinfo info;
 358         uint32_t stripesize_extents = 0;
 359         uint32_t seg_stripes = 0, seg_stripesize = 0, seg_size = 0;
 360         uint32_t seg_mirrors = 0;
 361         uint32_t extents_used = 0;
 362         uint32_t size_rest;
 363         uint32_t pv_extent_count = 0;
 364         alloc_policy_t alloc;
 365         struct logical_volume *lock_lv;
 366         struct lv_list *lvl;
 367         struct lv_segment *seg, *uninitialized_var(mirr_seg);
 368         uint32_t seg_extents;
 369         uint32_t sz, str;
 370         int status;
 371         struct dm_list *pvh = NULL;
 372         int use_policy = arg_count(cmd, use_policies_ARG);
 373
 374         /* does LV exist? */
 375         if (!(lvl = find_lv_in_vg(vg, lp->lv_name))) {
 376                 log_error("Logical volume %s not found in volume group %s",
 377                           lp->lv_name, lp->vg_name);
 378                 return ECMD_FAILED;
 379         }
 380
 381         if (lvl->lv->status & (RAID_IMAGE | RAID_META)) {
 382                 log_error("Cannot resize a RAID %s directly",
 383                           (lvl->lv->status & RAID_IMAGE) ? "image" :
 384                           "metadata area");
 385                 return ECMD_FAILED;
 386         }
 387
 388         if (lv_is_raid_with_tracking(lvl->lv)) {
 389                 log_error("Cannot resize %s while it is tracking a split image",
 390                           lvl->lv->name);
 391                 return ECMD_FAILED;
 392         }
 393
 394         if (arg_count(cmd, stripes_ARG)) {
 395                 if (vg->fid->fmt->features & FMT_SEGMENTS)
 396                         lp->stripes = arg_uint_value(cmd, stripes_ARG, 1);
 397                 else
 398                         log_warn("Varied striping not supported. Ignoring.");
 399         }
 400
 401         if (arg_count(cmd, mirrors_ARG)) {
 402                 if (vg->fid->fmt->features & FMT_SEGMENTS)
 403                         lp->mirrors = arg_uint_value(cmd, mirrors_ARG, 1) + 1;
 404                 else
 405                         log_warn("Mirrors not supported. Ignoring.");
 406                 if (arg_sign_value(cmd, mirrors_ARG, 0) == SIGN_MINUS) {
 407                         log_error("Mirrors argument may not be negative");
 408                         return EINVALID_CMD_LINE;
 409                 }
 410         }
 411
 412         if (arg_count(cmd, stripesize_ARG) &&
 413             !_validate_stripesize(cmd, vg, lp))
 414                 return EINVALID_CMD_LINE;
 415
 416         lv = lvl->lv;
 417
 418         if (use_policy) {
 419                 if (!lv_is_cow(lv) &&
 420                     !lv_is_thin_pool(lv)) {
 421                         log_error("Policy-based resize is supported only for snapshot and thin pool volumes.");
 422                         return ECMD_FAILED;
 423                 }
 424                 _adjust_policy_params(cmd, lv, lp);
 425         }
 426
 427         if (!lv_is_visible(lv)) {
 428                 log_error("Can't resize internal logical volume %s", lv->name);
 429                 return ECMD_FAILED;
 430         }
 431
 432         if (lv->status & LOCKED) {
 433                 log_error("Can't resize locked LV %s", lv->name);
 434                 return ECMD_FAILED;
 435         }
 436
 437         if (lv->status & CONVERTING) {
 438                 log_error("Can't resize %s while lvconvert in progress", lv->name);
 439                 return ECMD_FAILED;
 440         }
 441
 442         alloc = arg_uint_value(cmd, alloc_ARG, lv->alloc);
 443
 444         if (lp->size) {
 445                 if (lp->size % vg->extent_size) {
 446                         if (lp->sign == SIGN_MINUS)
 447                                 lp->size -= lp->size % vg->extent_size;
 448                         else
 449                                 lp->size += vg->extent_size -
 450                                     (lp->size % vg->extent_size);
 451
 452                         log_print("Rounding up size to full physical extent %s",
 453                                   display_size(cmd, (uint64_t) lp->size));
 454                 }
 455
 456                 lp->extents = lp->size / vg->extent_size;
 457         }
 458
 459         if (!(pvh = lp->argc ? create_pv_list(cmd->mem, vg, lp->argc,
 460                                                      lp->argv, 1) : &vg->pvs)) {
 461                 stack;
 462                 return ECMD_FAILED;
 463         }
 464
 465         switch(lp->percent) {
 466                 case PERCENT_VG:
 467                         lp->extents = percent_of_extents(lp->extents, vg->extent_count);
 468                         break;
 469                 case PERCENT_FREE:
 470                         lp->extents = percent_of_extents(lp->extents, vg->free_count);
 471                         break;
 472                 case PERCENT_LV:
 473                         lp->extents = percent_of_extents(lp->extents, lv->le_count);
 474                         break;
 475                 case PERCENT_PVS:
 476                         if (lp->argc) {
 477                                 pv_extent_count = pv_list_extents_free(pvh);
 478                                 lp->extents = percent_of_extents(lp->extents, pv_extent_count);
 479                         } else
 480                                 lp->extents = percent_of_extents(lp->extents, vg->extent_count);
 481                         break;
 482                 case PERCENT_ORIGIN:
 483                         if (!lv_is_cow(lv)) {
 484                                 log_error("Specified LV does not have an origin LV.");
 485                                 return EINVALID_CMD_LINE;
 486                         }
 487                         lp->extents = percent_of_extents(lp->extents, origin_from_cow(lv)->le_count);
 488                         break;
 489                 case PERCENT_NONE:
 490                         break;
 491         }
 492
 493         if (lp->sign == SIGN_PLUS) {
 494                 if (lp->extents >= (MAX_EXTENT_COUNT - lv->le_count)) {
 495                         log_error("Unable to extend %s by %u extents, exceeds limit (%u).",
 496                                   lp->lv_name, lv->le_count, MAX_EXTENT_COUNT);
 497                         return EINVALID_CMD_LINE;
 498                 }
 499                 lp->extents += lv->le_count;
 500         }
 501
 502         if (lp->sign == SIGN_MINUS) {
 503                 if (lp->extents >= lv->le_count) {
 504                         log_error("Unable to reduce %s below 1 extent",
 505                                   lp->lv_name);
 506                         return EINVALID_CMD_LINE;
 507                 }
 508
 509                 lp->extents = lv->le_count - lp->extents;
 510         }
 511
 512         if (!lp->extents) {
 513                 log_error("New size of 0 not permitted");
 514                 return EINVALID_CMD_LINE;
 515         }
 516
 517         if (lp->extents == lv->le_count) {
 518                 if (use_policy)
 519                         return ECMD_PROCESSED; /* Nothing to do. */
 520                 if (!lp->resizefs) {
 521                         log_error("New size (%d extents) matches existing size "
 522                                   "(%d extents)", lp->extents, lv->le_count);
 523                         return EINVALID_CMD_LINE;
 524                 }
 525                 lp->resize = LV_EXTEND; /* lets pretend zero size extension */
 526         }
 527
 528         seg_size = lp->extents - lv->le_count;
 529
 530         /* Use segment type of last segment */
 531         dm_list_iterate_items(seg, &lv->segments) {
 532                 lp->segtype = seg->segtype;
 533         }
 534
 535         /* FIXME Support LVs with mixed segment types */
 536         if (lp->segtype != get_segtype_from_string(cmd, arg_str_value(cmd, type_ARG,
 537                                                                       lp->segtype->name))) {
 538                 log_error("VolumeType does not match (%s)", lp->segtype->name);
 539                 return EINVALID_CMD_LINE;
 540         }
 541
 542         /* If extending, find mirrors of last segment */
 543         if ((lp->extents > lv->le_count)) {
 544                 /*
 545                  * Has the user specified that they would like the additional
 546                  * extents of a mirror not to have an initial sync?
 547                  */
 548                 if (seg_is_mirrored(first_seg(lv)) && arg_count(cmd, nosync_ARG))
 549                         lv->status |= LV_NOTSYNCED;
 550
 551                 dm_list_iterate_back_items(mirr_seg, &lv->segments) {
 552                         if (seg_is_mirrored(mirr_seg))
 553                                 seg_mirrors = lv_mirror_count(mirr_seg->lv);
 554                         else
 555                                 seg_mirrors = 0;
 556                         break;
 557                 }
 558                 if (!arg_count(cmd, mirrors_ARG) && seg_mirrors) {
 559                         log_print("Extending %" PRIu32 " mirror images.",
 560                                   seg_mirrors);
 561                         lp->mirrors = seg_mirrors;
 562                 }
 563                 if ((arg_count(cmd, mirrors_ARG) || seg_mirrors) &&
 564                     (lp->mirrors != seg_mirrors)) {
 565                         log_error("Cannot vary number of mirrors in LV yet.");
 566                         return EINVALID_CMD_LINE;
 567                 }
 568         }
 569
 570         /* If extending, find stripes, stripesize & size of last segment */
 571         if ((lp->extents > lv->le_count) &&
 572             !(lp->stripes == 1 || (lp->stripes > 1 && lp->stripe_size))) {
 573                 /* FIXME Don't assume mirror seg will always be AREA_LV */
 574                 dm_list_iterate_items(seg, seg_mirrors ? &seg_lv(mirr_seg, 0)->segments : &lv->segments) {
 575                         if (!seg_is_striped(seg))
 576                                 continue;
 577
 578                         sz = seg->stripe_size;
 579                         str = seg->area_count;
 580
 581                         if ((seg_stripesize && seg_stripesize != sz &&
 582                              sz && !lp->stripe_size) ||
 583                             (seg_stripes && seg_stripes != str && !lp->stripes)) {
 584                                 log_error("Please specify number of "
 585                                           "stripes (-i) and stripesize (-I)");
 586                                 return EINVALID_CMD_LINE;
 587                         }
 588
 589                         seg_stripesize = sz;
 590                         seg_stripes = str;
 591                 }
 592
 593                 if (!lp->stripes)
 594                         lp->stripes = seg_stripes;
 595
 596                 if (!lp->stripe_size && lp->stripes > 1) {
 597                         if (seg_stripesize) {
 598                                 log_print("Using stripesize of last segment %s",
 599                                           display_size(cmd, (uint64_t) seg_stripesize));
 600                                 lp->stripe_size = seg_stripesize;
 601                         } else {
 602                                 lp->stripe_size =
 603                                         find_config_tree_int(cmd,
 604                                                         "metadata/stripesize",
 605                                                         DEFAULT_STRIPESIZE) * 2;
 606                                 log_print("Using default stripesize %s",
 607                                           display_size(cmd, (uint64_t) lp->stripe_size));
 608                         }
 609                 }
 610         }
 611
 612         /* If reducing, find stripes, stripesize & size of last segment */
 613         if (lp->extents < lv->le_count) {
 614                 extents_used = 0;
 615
 616                 if (lp->stripes || lp->stripe_size || lp->mirrors)
 617                         log_error("Ignoring stripes, stripesize and mirrors "
 618                                   "arguments when reducing");
 619
 620                 dm_list_iterate_items(seg, &lv->segments) {
 621                         seg_extents = seg->len;
 622
 623                         /* Check for underlying stripe sizes */
 624                         seg_stripes = lvseg_get_stripes(seg, &seg_stripesize);
 625
 626                         if (seg_is_mirrored(seg))
 627                                 seg_mirrors = lv_mirror_count(seg->lv);
 628                         else
 629                                 seg_mirrors = 0;
 630
 631                         if (lp->extents <= extents_used + seg_extents)
 632                                 break;
 633
 634                         extents_used += seg_extents;
 635                 }
 636
 637                 seg_size = lp->extents - extents_used;
 638                 lp->stripe_size = seg_stripesize;
 639                 lp->stripes = seg_stripes;
 640                 lp->mirrors = seg_mirrors;
 641         }
 642
 643         if (lp->stripes > 1 && !lp->stripe_size) {
 644                 log_error("Stripesize for striped segment should not be 0!");
 645                 return EINVALID_CMD_LINE;
 646         }
 647
 648         if (lp->stripes > 1) {
 649                 if (!(stripesize_extents = lp->stripe_size / vg->extent_size))
 650                         stripesize_extents = 1;
 651
 652                 size_rest = seg_size % (lp->stripes * stripesize_extents);
 653                 /* Round toward the original size. */
 654                 if (size_rest && lp->extents < lv->le_count) {
 655                         log_print("Rounding size (%d extents) up to stripe "
 656                                   "boundary size for segment (%d extents)",
 657                                   lp->extents, lp->extents - size_rest +
 658                                   (lp->stripes * stripesize_extents));
 659                         lp->extents = lp->extents - size_rest +
 660                                       (lp->stripes * stripesize_extents);
 661                 } else if (size_rest) {
 662                         log_print("Rounding size (%d extents) down to stripe "
 663                                   "boundary size for segment (%d extents)",
 664                                   lp->extents, lp->extents - size_rest);
 665                         lp->extents = lp->extents - size_rest;
 666                 }
 667
 668                 if (lp->stripe_size < STRIPE_SIZE_MIN) {
 669                         log_error("Invalid stripe size %s",
 670                                   display_size(cmd, (uint64_t) lp->stripe_size));
 671                         return EINVALID_CMD_LINE;
 672                 }
 673         }
 674
 675         if (lp->extents < lv->le_count) {
 676                 if (lp->resize == LV_EXTEND) {
 677                         log_error("New size given (%d extents) not larger "
 678                                   "than existing size (%d extents)",
 679                                   lp->extents, lv->le_count);
 680                         return EINVALID_CMD_LINE;
 681                 }
 682                 lp->resize = LV_REDUCE;
 683         } else if (lp->extents > lv->le_count) {
 684                 if (lp->resize == LV_REDUCE) {
 685                         log_error("New size given (%d extents) not less than "
 686                                   "existing size (%d extents)", lp->extents,
 687                                   lv->le_count);
 688                         return EINVALID_CMD_LINE;
 689                 }
 690                 lp->resize = LV_EXTEND;
 691         }
 692
 693         if (lv_is_origin(lv)) {
 694                 if (lp->resize == LV_REDUCE) {
 695                         log_error("Snapshot origin volumes cannot be reduced "
 696                                   "in size yet.");
 697                         return ECMD_FAILED;
 698                 }
 699
 700                 memset(&info, 0, sizeof(info));
 701
 702                 if (lv_info(cmd, lv, 0, &info, 0, 0) && info.exists) {
 703                         log_error("Snapshot origin volumes can be resized "
 704                                   "only while inactive: try lvchange -an");
 705                         return ECMD_FAILED;
 706                 }
 707         }
 708
 709         if (lv_is_thin_pool(lv)) {
 710                 if (lp->resize == LV_REDUCE) {
 711                         log_error("Thin pool volumes cannot be reduced in size yet.");
 712                         return ECMD_FAILED;
 713                 }
 714
 715                 if (lp->resizefs) {
 716                         log_warn("Thin pool volumes do not have filesystem.");
 717                         lp->resizefs = 0;
 718                 }
 719
 720                 if (!lp->stripes) {
 721                         /* Try to use the same strip settings for underlying pool data LV */
 722                         lp->stripes = last_seg(seg_lv(first_seg(lv), 0))->area_count;
 723                         if (!lp->stripe_size)
 724                                 lp->stripe_size = last_seg(seg_lv(first_seg(lv), 0))->stripe_size;
 725                 }
 726         }
 727
 728         if ((lp->resize == LV_REDUCE) && lp->argc)
 729                 log_warn("Ignoring PVs on command line when reducing");
 730
 731         /* Request confirmation before operations that are often mistakes. */
 732         if ((lp->resizefs || (lp->resize == LV_REDUCE)) &&
 733             !_request_confirmation(cmd, vg, lv, lp)) {
 734                 stack;
 735                 return ECMD_FAILED;
 736         }
 737
 738         if (lp->resizefs) {
 739                 if (!lp->nofsck &&
 740                     !_fsadm_cmd(cmd, vg, lp, FSADM_CMD_CHECK, &status)) {
 741                         if (status != FSADM_CHECK_FAILS_FOR_MOUNTED) {
 742                                 log_error("Filesystem check failed.");
 743                                 return ECMD_FAILED;
 744                         }
 745                         /* some filesystems supports online resize */
 746                 }
 747
 748                 if ((lp->resize == LV_REDUCE) &&
 749                     !_fsadm_cmd(cmd, vg, lp, FSADM_CMD_RESIZE, NULL)) {
 750                         log_error("Filesystem resize failed.");
 751                         return ECMD_FAILED;
 752                 }
 753         }
 754
 755         if (!archive(vg)) {
 756                 stack;
 757                 return ECMD_FAILED;
 758         }
 759
 760         log_print("%sing logical volume %s to %s",
 761                   (lp->resize == LV_REDUCE) ? "Reduc" : "Extend",
 762                   lp->lv_name,
 763                   display_size(cmd, (uint64_t) lp->extents * vg->extent_size));
 764
 765         if (lp->resize == LV_REDUCE) {
 766                 if (!lv_reduce(lv, lv->le_count - lp->extents)) {
 767                         stack;
 768                         return ECMD_FAILED;
 769                 }
 770         } else if ((lp->extents > lv->le_count) && /* Ensure we extend */
 771                    !lv_extend(lv, lp->segtype,
 772                               lp->stripes, lp->stripe_size,
 773                               lp->mirrors, first_seg(lv)->region_size,
 774                               lp->extents - lv->le_count, NULL,
 775                               pvh, alloc)) {
 776                 stack;
 777                 return ECMD_FAILED;
 778         }
 779
 780         /* store vg on disk(s) */
 781         if (!vg_write(vg)) {
 782                 stack;
 783                 return ECMD_FAILED;
 784         }
 785
 786         /* If snapshot, must suspend all associated devices */
 787         if (lv_is_cow(lv))
 788                 lock_lv = origin_from_cow(lv);
 789         else
 790                 lock_lv = lv;
 791
 792         if (!suspend_lv(cmd, lock_lv)) {
 793                 log_error("Failed to suspend %s", lp->lv_name);
 794                 vg_revert(vg);
 795                 backup(vg);
 796                 return ECMD_FAILED;
 797         }
 798
 799         if (!vg_commit(vg)) {
 800                 stack;
 801                 if (!resume_lv(cmd, lock_lv))
 802                         stack;
 803                 backup(vg);
 804                 return ECMD_FAILED;
 805         }
 806
 807         if (!resume_lv(cmd, lock_lv)) {
 808                 log_error("Problem reactivating %s", lp->lv_name);
 809                 backup(vg);
 810                 return ECMD_FAILED;
 811         }
 812
 813         backup(vg);
 814
 815         /*
 816          * Update lvm pool metadata (drop messages) if the pool has been
 817          * resumed and do a pool active/deactivate in other case.
 818          *
 819          * Note: Active thin pool can be waiting for resize.
 820          *
 821          * FIXME: Activate only when thin volume is active
 822          */
 823         if (lv_is_thin_pool(lv) &&
 824             !update_pool_lv(lv, !lv_is_active(lv))) {
 825                 stack;
 826                 return ECMD_FAILED;
 827         }
 828
 829         log_print("Logical volume %s successfully resized", lp->lv_name);
 830
 831         if (lp->resizefs && (lp->resize == LV_EXTEND) &&
 832             !_fsadm_cmd(cmd, vg, lp, FSADM_CMD_RESIZE, NULL)) {
 833                 stack;
 834                 return ECMD_FAILED;
 835         }
 836
 837         return ECMD_PROCESSED;
 838 }
 839
 840 int lvresize(struct cmd_context *cmd, int argc, char **argv)
 841 {
 842         struct lvresize_params lp;
 843         struct volume_group *vg;
 844         int r;
 845
 846         memset(&lp, 0, sizeof(lp));
 847
 848         if (!_lvresize_params(cmd, argc, argv, &lp))
 849                 return EINVALID_CMD_LINE;
 850
 851         log_verbose("Finding volume group %s", lp.vg_name);
 852         vg = vg_read_for_update(cmd, lp.vg_name, NULL, 0);
 853         if (vg_read_error(vg)) {
 854                 release_vg(vg);
 855                 stack;
 856                 return ECMD_FAILED;
 857         }
 858
 859         if (!(r = _lvresize(cmd, vg, &lp)))
 860                 stack;
 861
 862         unlock_and_release_vg(cmd, vg, lp.vg_name);
 863
 864         return r;
 865 }