tools/lvresize.c

   1 /*
   2  * Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
   3  * Copyright (C) 2004 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 General Public License v.2.
  10  *
  11  * You should have received a copy of the GNU 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         struct segment_type *segtype;
  29
  30         /* size */
  31         uint32_t extents;
  32         uint64_t size;
  33         sign_t sign;
  34
  35         enum {
  36                 LV_ANY = 0,
  37                 LV_REDUCE = 1,
  38                 LV_EXTEND = 2
  39         } resize;
  40
  41         int resizefs;
  42         int nofsck;
  43
  44         int argc;
  45         char **argv;
  46 };
  47
  48 static int _read_params(struct cmd_context *cmd, int argc, char **argv,
  49                         struct lvresize_params *lp)
  50 {
  51         const char *cmd_name;
  52         char *st;
  53
  54         lp->sign = SIGN_NONE;
  55         lp->resize = LV_ANY;
  56
  57         cmd_name = command_name(cmd);
  58         if (!strcmp(cmd_name, "lvreduce"))
  59                 lp->resize = LV_REDUCE;
  60         if (!strcmp(cmd_name, "lvextend"))
  61                 lp->resize = LV_EXTEND;
  62
  63         if (arg_count(cmd, extents_ARG) + arg_count(cmd, size_ARG) != 1) {
  64                 log_error("Please specify either size or extents (not both)");
  65                 return 0;
  66         }
  67
  68         if (arg_count(cmd, extents_ARG)) {
  69                 lp->extents = arg_uint_value(cmd, extents_ARG, 0);
  70                 lp->sign = arg_sign_value(cmd, extents_ARG, SIGN_NONE);
  71         }
  72
  73         /* Size returned in kilobyte units; held in sectors */
  74         if (arg_count(cmd, size_ARG)) {
  75                 lp->size = arg_uint64_value(cmd, size_ARG, UINT64_C(0)) * 2;
  76                 lp->sign = arg_sign_value(cmd, size_ARG, SIGN_NONE);
  77         }
  78
  79         if (lp->resize == LV_EXTEND && lp->sign == SIGN_MINUS) {
  80                 log_error("Negative argument not permitted - use lvreduce");
  81                 return 0;
  82         }
  83
  84         if (lp->resize == LV_REDUCE && lp->sign == SIGN_PLUS) {
  85                 log_error("Positive sign not permitted - use lvextend");
  86                 return 0;
  87         }
  88
  89         lp->resizefs = arg_count(cmd, resizefs_ARG) ? 1 : 0;
  90         lp->nofsck = arg_count(cmd, nofsck_ARG) ? 1 : 0;
  91
  92         if (!argc) {
  93                 log_error("Please provide the logical volume name");
  94                 return 0;
  95         }
  96
  97         lp->lv_name = argv[0];
  98         argv++;
  99         argc--;
 100
 101         if (!(lp->vg_name = extract_vgname(cmd, lp->lv_name))) {
 102                 log_error("Please provide a volume group name");
 103                 return 0;
 104         }
 105
 106         if ((st = strrchr(lp->lv_name, '/')))
 107                 lp->lv_name = st + 1;
 108
 109         lp->argc = argc;
 110         lp->argv = argv;
 111
 112         return 1;
 113 }
 114
 115 static int _lvresize(struct cmd_context *cmd, struct lvresize_params *lp)
 116 {
 117         struct volume_group *vg;
 118         struct logical_volume *lv;
 119         struct lv_segment *snap_seg;
 120         struct lvinfo info;
 121         uint32_t stripesize_extents = 0;
 122         uint32_t seg_stripes = 0, seg_stripesize = 0, seg_size = 0;
 123         uint32_t seg_mirrors = 0;
 124         uint32_t extents_used = 0;
 125         uint32_t size_rest;
 126         alloc_policy_t alloc;
 127         char *lock_lvid;
 128         struct lv_list *lvl;
 129         int consistent = 1;
 130         struct lv_segment *seg;
 131         uint32_t seg_extents;
 132         uint32_t sz, str;
 133         struct list *pvh = NULL;
 134         char size_buf[SIZE_BUF];
 135         char lv_path[PATH_MAX];
 136
 137         if (!(vg = vg_read(cmd, lp->vg_name, &consistent))) {
 138                 log_error("Volume group %s doesn't exist", lp->vg_name);
 139                 return ECMD_FAILED;
 140         }
 141
 142         if (vg->status & EXPORTED_VG) {
 143                 log_error("Volume group %s is exported", vg->name);
 144                 return ECMD_FAILED;
 145         }
 146
 147         if (!(vg->status & LVM_WRITE)) {
 148                 log_error("Volume group %s is read-only", lp->vg_name);
 149                 return ECMD_FAILED;
 150         }
 151
 152         /* does LV exist? */
 153         if (!(lvl = find_lv_in_vg(vg, lp->lv_name))) {
 154                 log_error("Logical volume %s not found in volume group %s",
 155                           lp->lv_name, lp->vg_name);
 156                 return ECMD_FAILED;
 157         }
 158
 159         if (arg_count(cmd, stripes_ARG)) {
 160                 if (vg->fid->fmt->features & FMT_SEGMENTS)
 161                         lp->stripes = arg_uint_value(cmd, stripes_ARG, 1);
 162                 else
 163                         log_print("Varied striping not supported. Ignoring.");
 164         }
 165
 166         if (arg_count(cmd, mirrors_ARG)) {
 167                 if (vg->fid->fmt->features & FMT_SEGMENTS)
 168                         lp->mirrors = arg_uint_value(cmd, mirrors_ARG, 1) + 1;
 169                 else
 170                         log_print("Mirrors not supported. Ignoring.");
 171         }
 172
 173         if (arg_count(cmd, stripesize_ARG)) {
 174                 if (arg_sign_value(cmd, stripesize_ARG, 0) == SIGN_MINUS) {
 175                         log_error("Stripesize may not be negative.");
 176                         return ECMD_FAILED;
 177                 }
 178                 if (vg->fid->fmt->features & FMT_SEGMENTS)
 179                         lp->stripe_size = 2 * arg_uint_value(cmd,
 180                                                              stripesize_ARG, 0);
 181                 else
 182                         log_print("Varied stripesize not supported. Ignoring.");
 183                 if (lp->mirrors) {
 184                         log_error("Mirrors and striping cannot be combined yet.");
 185                         return ECMD_FAILED;
 186                 }
 187         }
 188
 189         lv = lvl->lv;
 190
 191         if (lv->status & LOCKED) {
 192                 log_error("Can't resize locked LV %s", lv->name);
 193                 return ECMD_FAILED;
 194         }
 195
 196         alloc = (alloc_policy_t) arg_uint_value(cmd, alloc_ARG, lv->alloc);
 197
 198         if (lp->size) {
 199                 if (lp->size % vg->extent_size) {
 200                         if (lp->sign == SIGN_MINUS)
 201                                 lp->size -= lp->size % vg->extent_size;
 202                         else
 203                                 lp->size += vg->extent_size -
 204                                     (lp->size % vg->extent_size);
 205
 206                         log_print("Rounding up size to full physical extent %s",
 207                                   display_size(cmd, (uint64_t) lp->size,
 208                                                SIZE_SHORT));
 209                 }
 210
 211                 lp->extents = lp->size / vg->extent_size;
 212         }
 213
 214         if (lp->sign == SIGN_PLUS)
 215                 lp->extents += lv->le_count;
 216
 217         if (lp->sign == SIGN_MINUS) {
 218                 if (lp->extents >= lv->le_count) {
 219                         log_error("Unable to reduce %s below 1 extent",
 220                                   lp->lv_name);
 221                         return EINVALID_CMD_LINE;
 222                 }
 223
 224                 lp->extents = lv->le_count - lp->extents;
 225         }
 226
 227         if (!lp->extents) {
 228                 log_error("New size of 0 not permitted");
 229                 return EINVALID_CMD_LINE;
 230         }
 231
 232         if (lp->extents == lv->le_count) {
 233                 log_error("New size (%d extents) matches existing size "
 234                           "(%d extents)", lp->extents, lv->le_count);
 235                 return EINVALID_CMD_LINE;
 236         }
 237
 238         seg_size = lp->extents - lv->le_count;
 239
 240         /* Use segment type of last segment */
 241         list_iterate_items(seg, &lv->segments) {
 242                 lp->segtype = seg->segtype;
 243         }
 244
 245         /* FIXME Support LVs with mixed segment types */
 246         if (lp->segtype != (struct segment_type *) arg_ptr_value(cmd, type_ARG,
 247                                                                  lp->segtype)) {
 248                 log_error("VolumeType does not match (%s)", lp->segtype->name);
 249                 return EINVALID_CMD_LINE;
 250         }
 251
 252         /* If extending, find stripes, stripesize & size of last segment */
 253         if ((lp->extents > lv->le_count) &&
 254             !(lp->stripes == 1 || (lp->stripes > 1 && lp->stripe_size))) {
 255                 list_iterate_items(seg, &lv->segments) {
 256                         if (!seg_is_striped(seg))
 257                                 continue;
 258
 259                         sz = seg->stripe_size;
 260                         str = seg->area_count;
 261
 262                         if ((seg_stripesize && seg_stripesize != sz
 263                              && !lp->stripe_size) ||
 264                             (seg_stripes && seg_stripes != str && !lp->stripes)) {
 265                                 log_error("Please specify number of "
 266                                           "stripes (-i) and stripesize (-I)");
 267                                 return EINVALID_CMD_LINE;
 268                         }
 269
 270                         seg_stripesize = sz;
 271                         seg_stripes = str;
 272                 }
 273
 274                 if (!lp->stripes)
 275                         lp->stripes = seg_stripes;
 276
 277                 if (!lp->stripe_size && lp->stripes > 1) {
 278                         if (seg_stripesize) {
 279                                 log_print("Using stripesize of last segment "
 280                                           "%dKB", seg_stripesize / 2);
 281                                 lp->stripe_size = seg_stripesize;
 282                         } else {
 283                                 lp->stripe_size =
 284                                         find_config_int(cmd->cft->root,
 285                                                         "metadata/stripesize",
 286                                                         DEFAULT_STRIPESIZE) * 2;
 287                                 log_print("Using default stripesize %dKB",
 288                                           lp->stripe_size / 2);
 289                         }
 290                 }
 291         }
 292
 293         /* If extending, find mirrors of last segment */
 294         if ((lp->extents > lv->le_count)) {
 295                 list_iterate_back_items(seg, &lv->segments) {
 296                         if (seg_is_mirrored(seg))
 297                                 seg_mirrors = seg->area_count;
 298                         else
 299                                 seg_mirrors = 0;
 300                         break;
 301                 }
 302                 if (!arg_count(cmd, mirrors_ARG) && seg_mirrors) {
 303                         log_print("Extending %" PRIu32 " mirror images.",
 304                                   seg_mirrors);
 305                         lp->mirrors = seg_mirrors;
 306                 }
 307                 if ((arg_count(cmd, mirrors_ARG) || seg_mirrors) &&
 308                     (lp->mirrors != seg_mirrors)) {
 309                         log_error("Cannot vary number of mirrors in LV yet.");
 310                         return EINVALID_CMD_LINE;
 311                 }
 312         }
 313
 314         /* If reducing, find stripes, stripesize & size of last segment */
 315         if (lp->extents < lv->le_count) {
 316                 extents_used = 0;
 317
 318                 if (lp->stripes || lp->stripe_size || lp->mirrors)
 319                         log_error("Ignoring stripes, stripesize and mirrors "
 320                                   "arguments when reducing");
 321
 322                 list_iterate_items(seg, &lv->segments) {
 323                         seg_extents = seg->len;
 324
 325                         if (seg_is_striped(seg)) {
 326                                 seg_stripesize = seg->stripe_size;
 327                                 seg_stripes = seg->area_count;
 328                         }
 329
 330                         if (seg_is_mirrored(seg))
 331                                 seg_mirrors = seg->area_count;
 332                         else
 333                                 seg_mirrors = 0;
 334
 335                         if (lp->extents <= extents_used + seg_extents)
 336                                 break;
 337
 338                         extents_used += seg_extents;
 339                 }
 340
 341                 seg_size = lp->extents - extents_used;
 342                 lp->stripe_size = seg_stripesize;
 343                 lp->stripes = seg_stripes;
 344                 lp->mirrors = seg_mirrors;
 345         }
 346
 347         if (lp->stripes > 1 && !lp->stripe_size) {
 348                 log_error("Stripesize for striped segment should not be 0!");
 349                 return EINVALID_CMD_LINE;
 350         }
 351
 352         if ((lp->stripes > 1)) {
 353                 if (!(stripesize_extents = lp->stripe_size / vg->extent_size))
 354                         stripesize_extents = 1;
 355
 356                 if ((size_rest = seg_size % (lp->stripes * stripesize_extents))) {
 357                         log_print("Rounding size (%d extents) down to stripe "
 358                                   "boundary size for segment (%d extents)",
 359                                   lp->extents, lp->extents - size_rest);
 360                         lp->extents = lp->extents - size_rest;
 361                 }
 362         }
 363
 364         if (lp->extents == lv->le_count) {
 365                 log_error("New size (%d extents) matches existing size "
 366                           "(%d extents)", lp->extents, lv->le_count);
 367                 return EINVALID_CMD_LINE;
 368         }
 369
 370         if (lp->extents < lv->le_count) {
 371                 if (lp->resize == LV_EXTEND) {
 372                         log_error("New size given (%d extents) not larger "
 373                                   "than existing size (%d extents)",
 374                                   lp->extents, lv->le_count);
 375                         return EINVALID_CMD_LINE;
 376                 } else
 377                         lp->resize = LV_REDUCE;
 378         }
 379
 380         if (lp->extents > lv->le_count) {
 381                 if (lp->resize == LV_REDUCE) {
 382                         log_error("New size given (%d extents) not less than "
 383                                   "existing size (%d extents)", lp->extents,
 384                                   lv->le_count);
 385                         return EINVALID_CMD_LINE;
 386                 } else
 387                         lp->resize = LV_EXTEND;
 388         }
 389
 390         if (lp->mirrors && activation() &&
 391             lv_info(lv, &info, 0) && info.exists) {
 392                 log_error("Mirrors cannot be resized while active yet.");
 393                 return ECMD_FAILED;
 394         }
 395
 396         if (lv_is_origin(lv)) {
 397                 if (lp->resize == LV_REDUCE) {
 398                         log_error("Snapshot origin volumes cannot be reduced "
 399                                   "in size yet.");
 400                         return ECMD_FAILED;
 401                 }
 402
 403                 memset(&info, 0, sizeof(info));
 404
 405                 if (lv_info(lv, &info, 0) && info.exists) {
 406                         log_error("Snapshot origin volumes can be resized "
 407                                   "only while inactive: try lvchange -an");
 408                         return ECMD_FAILED;
 409                 }
 410         }
 411
 412         if (lp->resize == LV_REDUCE) {
 413                 if (lp->argc)
 414                         log_print("Ignoring PVs on command line when reducing");
 415         } else if (!(pvh = lp->argc ? create_pv_list(cmd->mem, vg, lp->argc,
 416                                                      lp->argv, 1) : &vg->pvs)) {
 417                 stack;
 418                 return ECMD_FAILED;
 419         }
 420
 421         if (lp->resize == LV_REDUCE || lp->resizefs) {
 422                 memset(&info, 0, sizeof(info));
 423
 424                 if (!lv_info(lv, &info, 1) && driver_version(NULL, 0)) {
 425                         log_error("lv_info failed: aborting");
 426                         return ECMD_FAILED;
 427                 }
 428
 429                 if (lp->resizefs && !info.exists) {
 430                         log_error("Logical volume %s must be activated "
 431                                   "before resizing filesystem", lp->lv_name);
 432                         return ECMD_FAILED;
 433                 }
 434
 435                 if (info.exists && !lp->resizefs && (lp->resize == LV_REDUCE)) {
 436                         log_print("WARNING: Reducing active%s logical volume "
 437                                   "to %s", info.open_count ? " and open" : "",
 438                                   display_size(cmd, (uint64_t) lp->extents *
 439                                                     vg->extent_size,
 440                                                SIZE_SHORT));
 441
 442                         log_print("THIS MAY DESTROY YOUR DATA "
 443                                   "(filesystem etc.)");
 444
 445                         if (!arg_count(cmd, force_ARG)) {
 446                                 if (yes_no_prompt("Do you really want to "
 447                                                   "reduce %s? [y/n]: ",
 448                                                   lp->lv_name) == 'n') {
 449                                         log_print("Logical volume %s NOT "
 450                                                   "reduced", lp->lv_name);
 451                                         return ECMD_FAILED;
 452                                 }
 453                         }
 454                 }
 455         }
 456
 457         if (lp->resizefs) {
 458                 if (lvm_snprintf(lv_path, PATH_MAX, "%s%s/%s", cmd->dev_dir,
 459                                  lp->vg_name, lp->lv_name) < 0) {
 460                         log_error("Couldn't create LV path for %s",
 461                                   lp->lv_name);
 462                         return ECMD_FAILED;
 463                 }
 464
 465                 if (lvm_snprintf(size_buf, SIZE_BUF, "%" PRIu64,
 466                                  (uint64_t) lp->extents * vg->extent_size / 2)
 467                                  < 0) {
 468                         log_error("Couldn't generate new LV size string");
 469                         return ECMD_FAILED;
 470                 }
 471
 472                 if (!lp->nofsck) {
 473                         if (!exec_cmd("fsadm", "check", lv_path, NULL)) {
 474                                 stack;
 475                                 return ECMD_FAILED;
 476                         }
 477                 }
 478
 479                 if (lp->resize == LV_REDUCE) {
 480                         if (!exec_cmd("fsadm", "resize", lv_path, size_buf)) {
 481                                 stack;
 482                                 return ECMD_FAILED;
 483                         }
 484                 }
 485         }
 486
 487         if (!archive(vg)) {
 488                 stack;
 489                 return ECMD_FAILED;
 490         }
 491
 492         log_print("%sing logical volume %s to %s",
 493                   (lp->resize == LV_REDUCE) ? "Reduc" : "Extend",
 494                   lp->lv_name,
 495                   display_size(cmd, (uint64_t) lp->extents * vg->extent_size,
 496                                SIZE_SHORT));
 497
 498         if (lp->resize == LV_REDUCE) {
 499                 if (!lv_reduce(lv, lv->le_count - lp->extents)) {
 500                         stack;
 501                         return ECMD_FAILED;
 502                 }
 503         } else if (!lv_extend(lv, lp->segtype, lp->stripes,
 504                               lp->stripe_size, lp->mirrors,
 505                               lp->extents - lv->le_count,
 506                               NULL, 0u, 0u, pvh, alloc)) {
 507                 stack;
 508                 return ECMD_FAILED;
 509         }
 510
 511         /* store vg on disk(s) */
 512         if (!vg_write(vg)) {
 513                 stack;
 514                 return ECMD_FAILED;
 515         }
 516
 517         backup(vg);
 518
 519         /* If snapshot, must suspend all associated devices */
 520         if ((snap_seg = find_cow(lv)))
 521                 lock_lvid = snap_seg->origin->lvid.s;
 522         else
 523                 lock_lvid = lv->lvid.s;
 524
 525         if (!suspend_lv(cmd, lock_lvid)) {
 526                 log_error("Failed to suspend %s", lp->lv_name);
 527                 vg_revert(vg);
 528                 return ECMD_FAILED;
 529         }
 530
 531         if (!vg_commit(vg)) {
 532                 stack;
 533                 resume_lv(cmd, lock_lvid);
 534                 return ECMD_FAILED;
 535         }
 536
 537         if (!resume_lv(cmd, lock_lvid)) {
 538                 log_error("Problem reactivating %s", lp->lv_name);
 539                 return ECMD_FAILED;
 540         }
 541
 542         log_print("Logical volume %s successfully resized", lp->lv_name);
 543
 544         if (lp->resizefs && (lp->resize == LV_EXTEND)) {
 545                 if (!exec_cmd("fsadm", "resize", lv_path, size_buf)) {
 546                         stack;
 547                         return ECMD_FAILED;
 548                 }
 549         }
 550
 551         return ECMD_PROCESSED;
 552 }
 553
 554 int lvresize(struct cmd_context *cmd, int argc, char **argv)
 555 {
 556         struct lvresize_params lp;
 557         int r;
 558
 559         memset(&lp, 0, sizeof(lp));
 560
 561         if (!_read_params(cmd, argc, argv, &lp))
 562                 return EINVALID_CMD_LINE;
 563
 564         log_verbose("Finding volume group %s", lp.vg_name);
 565         if (!lock_vol(cmd, lp.vg_name, LCK_VG_WRITE)) {
 566                 log_error("Can't get lock for %s", lp.vg_name);
 567                 return ECMD_FAILED;
 568         }
 569
 570         if (!(r = _lvresize(cmd, &lp)))
 571                 stack;
 572
 573         unlock_vg(cmd, lp.vg_name);
 574
 575         return r;
 576 }