tools/lvresize.c

   1 /*
   2  * Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
   3  * Copyright (C) 2004-2009 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         policy_threshold =
 289                 find_config_tree_int(cmd, "activation/snapshot_autoextend_threshold",
 290                                      DEFAULT_SNAPSHOT_AUTOEXTEND_THRESHOLD) * PERCENT_1;
 291         policy_amount =
 292                 find_config_tree_int(cmd, "activation/snapshot_autoextend_percent",
 293                                      DEFAULT_SNAPSHOT_AUTOEXTEND_PERCENT);
 294
 295         if (policy_threshold >= PERCENT_100)
 296                 return 1; /* nothing to do */
 297
 298         if (!lv_snapshot_percent(lv, &percent))
 299                 return_0;
 300
 301         if (!(PERCENT_0 < percent && percent < PERCENT_100) || percent <= policy_threshold)
 302                 return 1; /* nothing to do */
 303
 304         lp->extents = policy_amount;
 305         return 1;
 306 }
 307
 308 static uint32_t lvseg_get_stripes(struct lv_segment *seg, uint32_t *stripesize)
 309 {
 310         uint32_t s;
 311         struct lv_segment *seg_mirr;
 312
 313         /* If segment mirrored, check if images are striped */
 314         if (seg_is_mirrored(seg))
 315                 for (s = 0; s < seg->area_count; s++) {
 316                         if (seg_type(seg, s) != AREA_LV)
 317                                 continue;
 318                         seg_mirr = first_seg(seg_lv(seg, s));
 319
 320                         if (seg_is_striped(seg_mirr)) {
 321                                 seg = seg_mirr;
 322                                 break;
 323                         }
 324                 }
 325
 326
 327         if (seg_is_striped(seg)) {
 328                 *stripesize = seg->stripe_size;
 329                 return seg->area_count;
 330         }
 331
 332         *stripesize = 0;
 333         return 0;
 334 }
 335
 336 static int _lvresize(struct cmd_context *cmd, struct volume_group *vg,
 337                      struct lvresize_params *lp)
 338 {
 339         struct logical_volume *lv;
 340         struct lvinfo info;
 341         uint32_t stripesize_extents = 0;
 342         uint32_t seg_stripes = 0, seg_stripesize = 0, seg_size = 0;
 343         uint32_t seg_mirrors = 0;
 344         uint32_t extents_used = 0;
 345         uint32_t size_rest;
 346         uint32_t pv_extent_count = 0;
 347         alloc_policy_t alloc;
 348         struct logical_volume *lock_lv;
 349         struct lv_list *lvl;
 350         struct lv_segment *seg, *uninitialized_var(mirr_seg);
 351         uint32_t seg_extents;
 352         uint32_t sz, str;
 353         int status;
 354         struct dm_list *pvh = NULL;
 355         int use_policy = arg_count(cmd, use_policies_ARG);
 356
 357         /* does LV exist? */
 358         if (!(lvl = find_lv_in_vg(vg, lp->lv_name))) {
 359                 log_error("Logical volume %s not found in volume group %s",
 360                           lp->lv_name, lp->vg_name);
 361                 return ECMD_FAILED;
 362         }
 363
 364         if (arg_count(cmd, stripes_ARG)) {
 365                 if (vg->fid->fmt->features & FMT_SEGMENTS)
 366                         lp->stripes = arg_uint_value(cmd, stripes_ARG, 1);
 367                 else
 368                         log_warn("Varied striping not supported. Ignoring.");
 369         }
 370
 371         if (arg_count(cmd, mirrors_ARG)) {
 372                 if (vg->fid->fmt->features & FMT_SEGMENTS)
 373                         lp->mirrors = arg_uint_value(cmd, mirrors_ARG, 1) + 1;
 374                 else
 375                         log_warn("Mirrors not supported. Ignoring.");
 376                 if (arg_sign_value(cmd, mirrors_ARG, 0) == SIGN_MINUS) {
 377                         log_error("Mirrors argument may not be negative");
 378                         return EINVALID_CMD_LINE;
 379                 }
 380         }
 381
 382         if (arg_count(cmd, stripesize_ARG) &&
 383             !_validate_stripesize(cmd, vg, lp))
 384                 return EINVALID_CMD_LINE;
 385
 386         lv = lvl->lv;
 387
 388         if (use_policy) {
 389                 if (!lv_is_cow(lv)) {
 390                         log_error("Can't use policy-based resize for non-snapshot volumes.");
 391                         return ECMD_FAILED;
 392                 }
 393                 _adjust_policy_params(cmd, lv, lp);
 394         }
 395
 396         if (!lv_is_visible(lv)) {
 397                 log_error("Can't resize internal logical volume %s", lv->name);
 398                 return ECMD_FAILED;
 399         }
 400
 401         if (lv->status & LOCKED) {
 402                 log_error("Can't resize locked LV %s", lv->name);
 403                 return ECMD_FAILED;
 404         }
 405
 406         if (lv->status & CONVERTING) {
 407                 log_error("Can't resize %s while lvconvert in progress", lv->name);
 408                 return ECMD_FAILED;
 409         }
 410
 411         alloc = arg_uint_value(cmd, alloc_ARG, lv->alloc);
 412
 413         if (lp->size) {
 414                 if (lp->size % vg->extent_size) {
 415                         if (lp->sign == SIGN_MINUS)
 416                                 lp->size -= lp->size % vg->extent_size;
 417                         else
 418                                 lp->size += vg->extent_size -
 419                                     (lp->size % vg->extent_size);
 420
 421                         log_print("Rounding up size to full physical extent %s",
 422                                   display_size(cmd, (uint64_t) lp->size));
 423                 }
 424
 425                 lp->extents = lp->size / vg->extent_size;
 426         }
 427
 428         if (!(pvh = lp->argc ? create_pv_list(cmd->mem, vg, lp->argc,
 429                                                      lp->argv, 1) : &vg->pvs)) {
 430                 stack;
 431                 return ECMD_FAILED;
 432         }
 433
 434         switch(lp->percent) {
 435                 case PERCENT_VG:
 436                         lp->extents = lp->extents * vg->extent_count / 100;
 437                         break;
 438                 case PERCENT_FREE:
 439                         lp->extents = lp->extents * vg->free_count / 100;
 440                         break;
 441                 case PERCENT_LV:
 442                         lp->extents = lp->extents * lv->le_count / 100;
 443                         break;
 444                 case PERCENT_PVS:
 445                         if (lp->argc) {
 446                                 pv_extent_count = pv_list_extents_free(pvh);
 447                                 lp->extents = lp->extents * pv_extent_count / 100;
 448                         } else
 449                                 lp->extents = lp->extents * vg->extent_count / 100;
 450                         break;
 451                 case PERCENT_ORIGIN:
 452                         if (!lv_is_cow(lv)) {
 453                                 log_error("Specified LV does not have an origin LV.");
 454                                 return EINVALID_CMD_LINE;
 455                         }
 456                         lp->extents = lp->extents * origin_from_cow(lv)->le_count / 100;
 457                         break;
 458                 case PERCENT_NONE:
 459                         break;
 460         }
 461
 462         if (lp->sign == SIGN_PLUS)
 463                 lp->extents += lv->le_count;
 464
 465         if (lp->sign == SIGN_MINUS) {
 466                 if (lp->extents >= lv->le_count) {
 467                         log_error("Unable to reduce %s below 1 extent",
 468                                   lp->lv_name);
 469                         return EINVALID_CMD_LINE;
 470                 }
 471
 472                 lp->extents = lv->le_count - lp->extents;
 473         }
 474
 475         if (!lp->extents) {
 476                 log_error("New size of 0 not permitted");
 477                 return EINVALID_CMD_LINE;
 478         }
 479
 480         if (lp->extents == lv->le_count) {
 481                 if (use_policy)
 482                         return ECMD_PROCESSED; /* Nothing to do. */
 483                 if (!lp->resizefs) {
 484                         log_error("New size (%d extents) matches existing size "
 485                                   "(%d extents)", lp->extents, lv->le_count);
 486                         return EINVALID_CMD_LINE;
 487                 }
 488                 lp->resize = LV_EXTEND; /* lets pretend zero size extension */
 489         }
 490
 491         seg_size = lp->extents - lv->le_count;
 492
 493         /* Use segment type of last segment */
 494         dm_list_iterate_items(seg, &lv->segments) {
 495                 lp->segtype = seg->segtype;
 496         }
 497
 498         /* FIXME Support LVs with mixed segment types */
 499         if (lp->segtype != get_segtype_from_string(cmd, arg_str_value(cmd, type_ARG,
 500                                                                       lp->segtype->name))) {
 501                 log_error("VolumeType does not match (%s)", lp->segtype->name);
 502                 return EINVALID_CMD_LINE;
 503         }
 504
 505         /* If extending, find mirrors of last segment */
 506         if ((lp->extents > lv->le_count)) {
 507                 dm_list_iterate_back_items(mirr_seg, &lv->segments) {
 508                         if (seg_is_mirrored(mirr_seg))
 509                                 seg_mirrors = lv_mirror_count(mirr_seg->lv);
 510                         else
 511                                 seg_mirrors = 0;
 512                         break;
 513                 }
 514                 if (!arg_count(cmd, mirrors_ARG) && seg_mirrors) {
 515                         log_print("Extending %" PRIu32 " mirror images.",
 516                                   seg_mirrors);
 517                         lp->mirrors = seg_mirrors;
 518                 }
 519                 if ((arg_count(cmd, mirrors_ARG) || seg_mirrors) &&
 520                     (lp->mirrors != seg_mirrors)) {
 521                         log_error("Cannot vary number of mirrors in LV yet.");
 522                         return EINVALID_CMD_LINE;
 523                 }
 524         }
 525
 526         /* If extending, find stripes, stripesize & size of last segment */
 527         if ((lp->extents > lv->le_count) &&
 528             !(lp->stripes == 1 || (lp->stripes > 1 && lp->stripe_size))) {
 529                 /* FIXME Don't assume mirror seg will always be AREA_LV */
 530                 dm_list_iterate_items(seg, seg_mirrors ? &seg_lv(mirr_seg, 0)->segments : &lv->segments) {
 531                         if (!seg_is_striped(seg))
 532                                 continue;
 533
 534                         sz = seg->stripe_size;
 535                         str = seg->area_count;
 536
 537                         if ((seg_stripesize && seg_stripesize != sz &&
 538                              sz && !lp->stripe_size) ||
 539                             (seg_stripes && seg_stripes != str && !lp->stripes)) {
 540                                 log_error("Please specify number of "
 541                                           "stripes (-i) and stripesize (-I)");
 542                                 return EINVALID_CMD_LINE;
 543                         }
 544
 545                         seg_stripesize = sz;
 546                         seg_stripes = str;
 547                 }
 548
 549                 if (!lp->stripes)
 550                         lp->stripes = seg_stripes;
 551
 552                 if (!lp->stripe_size && lp->stripes > 1) {
 553                         if (seg_stripesize) {
 554                                 log_print("Using stripesize of last segment %s",
 555                                           display_size(cmd, (uint64_t) seg_stripesize));
 556                                 lp->stripe_size = seg_stripesize;
 557                         } else {
 558                                 lp->stripe_size =
 559                                         find_config_tree_int(cmd,
 560                                                         "metadata/stripesize",
 561                                                         DEFAULT_STRIPESIZE) * 2;
 562                                 log_print("Using default stripesize %s",
 563                                           display_size(cmd, (uint64_t) lp->stripe_size));
 564                         }
 565                 }
 566         }
 567
 568         /* If reducing, find stripes, stripesize & size of last segment */
 569         if (lp->extents < lv->le_count) {
 570                 extents_used = 0;
 571
 572                 if (lp->stripes || lp->stripe_size || lp->mirrors)
 573                         log_error("Ignoring stripes, stripesize and mirrors "
 574                                   "arguments when reducing");
 575
 576                 dm_list_iterate_items(seg, &lv->segments) {
 577                         seg_extents = seg->len;
 578
 579                         /* Check for underlying stripe sizes */
 580                         seg_stripes = lvseg_get_stripes(seg, &seg_stripesize);
 581
 582                         if (seg_is_mirrored(seg))
 583                                 seg_mirrors = lv_mirror_count(seg->lv);
 584                         else
 585                                 seg_mirrors = 0;
 586
 587                         if (lp->extents <= extents_used + seg_extents)
 588                                 break;
 589
 590                         extents_used += seg_extents;
 591                 }
 592
 593                 seg_size = lp->extents - extents_used;
 594                 lp->stripe_size = seg_stripesize;
 595                 lp->stripes = seg_stripes;
 596                 lp->mirrors = seg_mirrors;
 597         }
 598
 599         if (lp->stripes > 1 && !lp->stripe_size) {
 600                 log_error("Stripesize for striped segment should not be 0!");
 601                 return EINVALID_CMD_LINE;
 602         }
 603
 604         if (lp->stripes > 1) {
 605                 if (!(stripesize_extents = lp->stripe_size / vg->extent_size))
 606                         stripesize_extents = 1;
 607
 608                 size_rest = seg_size % (lp->stripes * stripesize_extents);
 609                 if (size_rest && lp->resize == LV_REDUCE) {
 610                         log_print("Rounding size (%d extents) up to stripe "
 611                                   "boundary size for segment (%d extents)",
 612                                   lp->extents, lp->extents - size_rest +
 613                                   (lp->stripes * stripesize_extents));
 614                         lp->extents = lp->extents - size_rest +
 615                                       (lp->stripes * stripesize_extents);
 616                 } else if (size_rest) {
 617                         log_print("Rounding size (%d extents) down to stripe "
 618                                   "boundary size for segment (%d extents)",
 619                                   lp->extents, lp->extents - size_rest);
 620                         lp->extents = lp->extents - size_rest;
 621                 }
 622
 623                 if (lp->stripe_size < STRIPE_SIZE_MIN) {
 624                         log_error("Invalid stripe size %s",
 625                                   display_size(cmd, (uint64_t) lp->stripe_size));
 626                         return EINVALID_CMD_LINE;
 627                 }
 628         }
 629
 630         if (lp->extents < lv->le_count) {
 631                 if (lp->resize == LV_EXTEND) {
 632                         log_error("New size given (%d extents) not larger "
 633                                   "than existing size (%d extents)",
 634                                   lp->extents, lv->le_count);
 635                         return EINVALID_CMD_LINE;
 636                 }
 637                 lp->resize = LV_REDUCE;
 638         } else if (lp->extents > lv->le_count) {
 639                 if (lp->resize == LV_REDUCE) {
 640                         log_error("New size given (%d extents) not less than "
 641                                   "existing size (%d extents)", lp->extents,
 642                                   lv->le_count);
 643                         return EINVALID_CMD_LINE;
 644                 }
 645                 lp->resize = LV_EXTEND;
 646         }
 647
 648         if (lv_is_origin(lv)) {
 649                 if (lp->resize == LV_REDUCE) {
 650                         log_error("Snapshot origin volumes cannot be reduced "
 651                                   "in size yet.");
 652                         return ECMD_FAILED;
 653                 }
 654
 655                 memset(&info, 0, sizeof(info));
 656
 657                 if (lv_info(cmd, lv, 0, &info, 0, 0) && info.exists) {
 658                         log_error("Snapshot origin volumes can be resized "
 659                                   "only while inactive: try lvchange -an");
 660                         return ECMD_FAILED;
 661                 }
 662         }
 663
 664         if ((lp->resize == LV_REDUCE) && lp->argc)
 665                 log_warn("Ignoring PVs on command line when reducing");
 666
 667         /* Request confirmation before operations that are often mistakes. */
 668         if ((lp->resizefs || (lp->resize == LV_REDUCE)) &&
 669             !_request_confirmation(cmd, vg, lv, lp)) {
 670                 stack;
 671                 return ECMD_FAILED;
 672         }
 673
 674         if (lp->resizefs) {
 675                 if (!lp->nofsck &&
 676                     !_fsadm_cmd(cmd, vg, lp, FSADM_CMD_CHECK, &status)) {
 677                         if (status != FSADM_CHECK_FAILS_FOR_MOUNTED) {
 678                                 stack;
 679                                 return ECMD_FAILED;
 680                         }
 681                         /* some filesystems supports online resize */
 682                 }
 683
 684                 if ((lp->resize == LV_REDUCE) &&
 685                     !_fsadm_cmd(cmd, vg, lp, FSADM_CMD_RESIZE, NULL)) {
 686                         stack;
 687                         return ECMD_FAILED;
 688                 }
 689         }
 690
 691         if (!archive(vg)) {
 692                 stack;
 693                 return ECMD_FAILED;
 694         }
 695
 696         log_print("%sing logical volume %s to %s",
 697                   (lp->resize == LV_REDUCE) ? "Reduc" : "Extend",
 698                   lp->lv_name,
 699                   display_size(cmd, (uint64_t) lp->extents * vg->extent_size));
 700
 701         if (lp->resize == LV_REDUCE) {
 702                 if (!lv_reduce(lv, lv->le_count - lp->extents)) {
 703                         stack;
 704                         return ECMD_FAILED;
 705                 }
 706         } else if ((lp->extents > lv->le_count) && /* Ensure we extend */
 707                    !lv_extend(lv, lp->segtype,
 708                               lp->stripes, lp->stripe_size,
 709                               lp->mirrors, first_seg(lv)->region_size,
 710                               lp->extents - lv->le_count,
 711                               pvh, alloc)) {
 712                 stack;
 713                 return ECMD_FAILED;
 714         }
 715
 716         /* store vg on disk(s) */
 717         if (!vg_write(vg)) {
 718                 stack;
 719                 return ECMD_FAILED;
 720         }
 721
 722         /* If snapshot, must suspend all associated devices */
 723         if (lv_is_cow(lv))
 724                 lock_lv = origin_from_cow(lv);
 725         else
 726                 lock_lv = lv;
 727
 728         if (!suspend_lv(cmd, lock_lv)) {
 729                 log_error("Failed to suspend %s", lp->lv_name);
 730                 vg_revert(vg);
 731                 backup(vg);
 732                 return ECMD_FAILED;
 733         }
 734
 735         if (!vg_commit(vg)) {
 736                 stack;
 737                 if (!resume_lv(cmd, lock_lv))
 738                         stack;
 739                 backup(vg);
 740                 return ECMD_FAILED;
 741         }
 742
 743         if (!resume_lv(cmd, lock_lv)) {
 744                 log_error("Problem reactivating %s", lp->lv_name);
 745                 backup(vg);
 746                 return ECMD_FAILED;
 747         }
 748
 749         backup(vg);
 750
 751         log_print("Logical volume %s successfully resized", lp->lv_name);
 752
 753         if (lp->resizefs && (lp->resize == LV_EXTEND) &&
 754             !_fsadm_cmd(cmd, vg, lp, FSADM_CMD_RESIZE, NULL)) {
 755                 stack;
 756                 return ECMD_FAILED;
 757         }
 758
 759         return ECMD_PROCESSED;
 760 }
 761
 762 int lvresize(struct cmd_context *cmd, int argc, char **argv)
 763 {
 764         struct lvresize_params lp;
 765         struct volume_group *vg;
 766         int r;
 767
 768         memset(&lp, 0, sizeof(lp));
 769
 770         if (!_lvresize_params(cmd, argc, argv, &lp))
 771                 return EINVALID_CMD_LINE;
 772
 773         log_verbose("Finding volume group %s", lp.vg_name);
 774         vg = vg_read_for_update(cmd, lp.vg_name, NULL, 0);
 775         if (vg_read_error(vg)) {
 776                 release_vg(vg);
 777                 stack;
 778                 return ECMD_FAILED;
 779         }
 780
 781         if (!(r = _lvresize(cmd, vg, &lp)))
 782                 stack;
 783
 784         unlock_and_release_vg(cmd, vg, lp.vg_name);
 785
 786         return r;
 787 }