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
  27         struct segment_type *segtype;
  28
  29         /* size */
  30         uint32_t extents;
  31         uint64_t size;
  32         sign_t sign;
  33
  34         enum {
  35                 LV_ANY = 0,
  36                 LV_REDUCE = 1,
  37                 LV_EXTEND = 2
  38         } resize;
  39
  40         int resizefs;
  41         int nofsck;
  42
  43         int argc;
  44         char **argv;
  45 };
  46
  47 static int _read_params(struct cmd_context *cmd, int argc, char **argv,
  48                         struct lvresize_params *lp)
  49 {
  50         const char *cmd_name;
  51         char *st;
  52
  53         lp->sign = SIGN_NONE;
  54         lp->resize = LV_ANY;
  55
  56         cmd_name = command_name(cmd);
  57         if (!strcmp(cmd_name, "lvreduce"))
  58                 lp->resize = LV_REDUCE;
  59         if (!strcmp(cmd_name, "lvextend"))
  60                 lp->resize = LV_EXTEND;
  61
  62         if (arg_count(cmd, extents_ARG) + arg_count(cmd, size_ARG) != 1) {
  63                 log_error("Please specify either size or extents (not both)");
  64                 return 0;
  65         }
  66
  67         if (arg_count(cmd, extents_ARG)) {
  68                 lp->extents = arg_uint_value(cmd, extents_ARG, 0);
  69                 lp->sign = arg_sign_value(cmd, extents_ARG, SIGN_NONE);
  70         }
  71
  72         /* Size returned in kilobyte units; held in sectors */
  73         if (arg_count(cmd, size_ARG)) {
  74                 lp->size = arg_uint64_value(cmd, size_ARG, UINT64_C(0)) * 2;
  75                 lp->sign = arg_sign_value(cmd, size_ARG, SIGN_NONE);
  76         }
  77
  78         if (lp->resize == LV_EXTEND && lp->sign == SIGN_MINUS) {
  79                 log_error("Negative argument not permitted - use lvreduce");
  80                 return 0;
  81         }
  82
  83         if (lp->resize == LV_REDUCE && lp->sign == SIGN_PLUS) {
  84                 log_error("Positive sign not permitted - use lvextend");
  85                 return 0;
  86         }
  87
  88         lp->resizefs = arg_count(cmd, resizefs_ARG) ? 1 : 0;
  89         lp->nofsck = arg_count(cmd, nofsck_ARG) ? 1 : 0;
  90
  91         if (!argc) {
  92                 log_error("Please provide the logical volume name");
  93                 return 0;
  94         }
  95
  96         lp->lv_name = argv[0];
  97         argv++;
  98         argc--;
  99
 100         if (!(lp->vg_name = extract_vgname(cmd, lp->lv_name))) {
 101                 log_error("Please provide a volume group name");
 102                 return 0;
 103         }
 104
 105         if ((st = strrchr(lp->lv_name, '/')))
 106                 lp->lv_name = st + 1;
 107
 108         lp->argc = argc;
 109         lp->argv = argv;
 110
 111         return 1;
 112 }
 113
 114 static int _lvresize(struct cmd_context *cmd, struct lvresize_params *lp)
 115 {
 116         struct volume_group *vg;
 117         struct logical_volume *lv;
 118         struct snapshot *snap;
 119         struct lvinfo info;
 120         uint32_t stripesize_extents = 0;
 121         uint32_t seg_stripes = 0, seg_stripesize = 0, seg_size = 0;
 122         uint32_t extents_used = 0;
 123         uint32_t size_rest;
 124         alloc_policy_t alloc;
 125         char *lock_lvid;
 126         struct lv_list *lvl;
 127         int consistent = 1;
 128         struct lv_segment *seg;
 129         uint32_t seg_extents;
 130         uint32_t sz, str;
 131         struct list *pvh = NULL;
 132         char size_buf[SIZE_BUF];
 133         char lv_path[PATH_MAX];
 134
 135         if (!(vg = vg_read(cmd, lp->vg_name, &consistent))) {
 136                 log_error("Volume group %s doesn't exist", lp->vg_name);
 137                 return ECMD_FAILED;
 138         }
 139
 140         if (vg->status & EXPORTED_VG) {
 141                 log_error("Volume group %s is exported", vg->name);
 142                 return ECMD_FAILED;
 143         }
 144
 145         if (!(vg->status & LVM_WRITE)) {
 146                 log_error("Volume group %s is read-only", lp->vg_name);
 147                 return ECMD_FAILED;
 148         }
 149
 150         /* does LV exist? */
 151         if (!(lvl = find_lv_in_vg(vg, lp->lv_name))) {
 152                 log_error("Logical volume %s not found in volume group %s",
 153                           lp->lv_name, lp->vg_name);
 154                 return ECMD_FAILED;
 155         }
 156
 157         if (arg_count(cmd, stripes_ARG)) {
 158                 if (vg->fid->fmt->features & FMT_SEGMENTS)
 159                         lp->stripes = arg_uint_value(cmd, stripes_ARG, 1);
 160                 else
 161                         log_print("Varied striping not supported. Ignoring.");
 162         }
 163
 164         if (arg_count(cmd, stripesize_ARG)) {
 165                 if (arg_sign_value(cmd, stripesize_ARG, 0) == SIGN_MINUS) {
 166                         log_error("Stripesize may not be negative.");
 167                         return ECMD_FAILED;
 168                 }
 169                 if (vg->fid->fmt->features & FMT_SEGMENTS)
 170                         lp->stripe_size = 2 * arg_uint_value(cmd,
 171                                                              stripesize_ARG, 0);
 172                 else
 173                         log_print("Varied stripesize not supported. Ignoring.");
 174         }
 175
 176         lv = lvl->lv;
 177
 178         if (lv->status & LOCKED) {
 179                 log_error("Can't resize locked LV %s", lv->name);
 180                 return ECMD_FAILED;
 181         }
 182
 183         alloc = (alloc_policy_t) arg_uint_value(cmd, alloc_ARG, lv->alloc);
 184
 185         if (lp->size) {
 186                 if (lp->size % vg->extent_size) {
 187                         if (lp->sign == SIGN_MINUS)
 188                                 lp->size -= lp->size % vg->extent_size;
 189                         else
 190                                 lp->size += vg->extent_size -
 191                                     (lp->size % vg->extent_size);
 192
 193                         log_print("Rounding up size to full physical extent %s",
 194                                   display_size(cmd, (uint64_t) lp->size,
 195                                                SIZE_SHORT));
 196                 }
 197
 198                 lp->extents = lp->size / vg->extent_size;
 199         }
 200
 201         if (lp->sign == SIGN_PLUS)
 202                 lp->extents += lv->le_count;
 203
 204         if (lp->sign == SIGN_MINUS) {
 205                 if (lp->extents >= lv->le_count) {
 206                         log_error("Unable to reduce %s below 1 extent",
 207                                   lp->lv_name);
 208                         return EINVALID_CMD_LINE;
 209                 }
 210
 211                 lp->extents = lv->le_count - lp->extents;
 212         }
 213
 214         if (!lp->extents) {
 215                 log_error("New size of 0 not permitted");
 216                 return EINVALID_CMD_LINE;
 217         }
 218
 219         if (lp->extents == lv->le_count) {
 220                 log_error("New size (%d extents) matches existing size "
 221                           "(%d extents)", lp->extents, lv->le_count);
 222                 return EINVALID_CMD_LINE;
 223         }
 224
 225         seg_size = lp->extents - lv->le_count;
 226
 227         /* Use segment type of last segment */
 228         list_iterate_items(seg, &lv->segments) {
 229                 lp->segtype = seg->segtype;
 230         }
 231
 232         /* FIXME Support LVs with mixed segment types */
 233         if (lp->segtype != (struct segment_type *) arg_ptr_value(cmd, type_ARG,
 234                                                                  lp->segtype)) {
 235                 log_error("VolumeType does not match (%s)", lp->segtype->name);
 236                 return EINVALID_CMD_LINE;
 237         }
 238
 239         /* If extending, find stripes, stripesize & size of last segment */
 240         if ((lp->extents > lv->le_count) &&
 241             !(lp->stripes == 1 || (lp->stripes > 1 && lp->stripe_size))) {
 242                 list_iterate_items(seg, &lv->segments) {
 243                         if (!(seg->segtype->flags & SEG_AREAS_STRIPED))
 244                                 continue;
 245
 246                         sz = seg->stripe_size;
 247                         str = seg->area_count;
 248
 249                         if ((seg_stripesize && seg_stripesize != sz
 250                              && !lp->stripe_size) ||
 251                             (seg_stripes && seg_stripes != str && !lp->stripes)) {
 252                                 log_error("Please specify number of "
 253                                           "stripes (-i) and stripesize (-I)");
 254                                 return EINVALID_CMD_LINE;
 255                         }
 256
 257                         seg_stripesize = sz;
 258                         seg_stripes = str;
 259                 }
 260
 261                 if (!lp->stripes)
 262                         lp->stripes = seg_stripes;
 263
 264                 if (!lp->stripe_size && lp->stripes > 1) {
 265                         if (seg_stripesize) {
 266                                 log_print("Using stripesize of last segment "
 267                                           "%dKB", seg_stripesize / 2);
 268                                 lp->stripe_size = seg_stripesize;
 269                         } else {
 270                                 lp->stripe_size =
 271                                         find_config_int(cmd->cft->root,
 272                                                         "metadata/stripesize",
 273                                                         DEFAULT_STRIPESIZE) * 2;
 274                                 log_print("Using default stripesize %dKB",
 275                                           lp->stripe_size / 2);
 276                         }
 277                 }
 278         }
 279
 280         /* If reducing, find stripes, stripesize & size of last segment */
 281         if (lp->extents < lv->le_count) {
 282                 extents_used = 0;
 283
 284                 if (lp->stripes || lp->stripe_size)
 285                         log_error("Ignoring stripes and stripesize arguments "
 286                                   "when reducing");
 287
 288                 list_iterate_items(seg, &lv->segments) {
 289                         seg_extents = seg->len;
 290
 291                         if (seg->segtype->flags & SEG_AREAS_STRIPED) {
 292                                 seg_stripesize = seg->stripe_size;
 293                                 seg_stripes = seg->area_count;
 294                         }
 295
 296                         if (lp->extents <= extents_used + seg_extents)
 297                                 break;
 298
 299                         extents_used += seg_extents;
 300                 }
 301
 302                 seg_size = lp->extents - extents_used;
 303                 lp->stripe_size = seg_stripesize;
 304                 lp->stripes = seg_stripes;
 305         }
 306
 307         if (lp->stripes > 1 && !lp->stripe_size) {
 308                 log_error("Stripesize for striped segment should not be 0!");
 309                 return EINVALID_CMD_LINE;
 310         }
 311
 312         if ((lp->stripes > 1)) {
 313                 if (!(stripesize_extents = lp->stripe_size / vg->extent_size))
 314                         stripesize_extents = 1;
 315
 316                 if ((size_rest = seg_size % (lp->stripes * stripesize_extents))) {
 317                         log_print("Rounding size (%d extents) down to stripe "
 318                                   "boundary size for segment (%d extents)",
 319                                   lp->extents, lp->extents - size_rest);
 320                         lp->extents = lp->extents - size_rest;
 321                 }
 322         }
 323
 324         if (lp->extents == lv->le_count) {
 325                 log_error("New size (%d extents) matches existing size "
 326                           "(%d extents)", lp->extents, lv->le_count);
 327                 return EINVALID_CMD_LINE;
 328         }
 329
 330         if (lp->extents < lv->le_count) {
 331                 if (lp->resize == LV_EXTEND) {
 332                         log_error("New size given (%d extents) not larger "
 333                                   "than existing size (%d extents)",
 334                                   lp->extents, lv->le_count);
 335                         return EINVALID_CMD_LINE;
 336                 } else
 337                         lp->resize = LV_REDUCE;
 338         }
 339
 340         if (lp->extents > lv->le_count) {
 341                 if (lp->resize == LV_REDUCE) {
 342                         log_error("New size given (%d extents) not less than "
 343                                   "existing size (%d extents)", lp->extents,
 344                                   lv->le_count);
 345                         return EINVALID_CMD_LINE;
 346                 } else
 347                         lp->resize = LV_EXTEND;
 348         }
 349
 350         if (lp->resize == LV_REDUCE) {
 351                 if (lp->argc)
 352                         log_print("Ignoring PVs on command line when reducing");
 353         } else if (!(pvh = lp->argc ? create_pv_list(cmd->mem, vg, lp->argc,
 354                                                      lp->argv, 1) : &vg->pvs)) {
 355                 stack;
 356                 return ECMD_FAILED;
 357         }
 358
 359         if (lp->resize == LV_REDUCE || lp->resizefs) {
 360                 memset(&info, 0, sizeof(info));
 361
 362                 if (!lv_info(lv, &info) && driver_version(NULL, 0)) {
 363                         log_error("lv_info failed: aborting");
 364                         return ECMD_FAILED;
 365                 }
 366
 367                 if (lp->resizefs && !info.exists) {
 368                         log_error("Logical volume %s must be activated "
 369                                   "before resizing filesystem", lp->lv_name);
 370                         return ECMD_FAILED;
 371                 }
 372
 373                 if (info.exists && !lp->resizefs && (lp->resize == LV_REDUCE)) {
 374                         log_print("WARNING: Reducing active%s logical volume "
 375                                   "to %s", info.open_count ? " and open" : "",
 376                                   display_size(cmd, (uint64_t) lp->extents *
 377                                                     vg->extent_size,
 378                                                SIZE_SHORT));
 379
 380                         log_print("THIS MAY DESTROY YOUR DATA "
 381                                   "(filesystem etc.)");
 382
 383                         if (!arg_count(cmd, force_ARG)) {
 384                                 if (yes_no_prompt("Do you really want to "
 385                                                   "reduce %s? [y/n]: ",
 386                                                   lp->lv_name) == 'n') {
 387                                         log_print("Logical volume %s NOT "
 388                                                   "reduced", lp->lv_name);
 389                                         return ECMD_FAILED;
 390                                 }
 391                         }
 392                 }
 393         }
 394
 395         if (lp->resizefs) {
 396                 if (lvm_snprintf(lv_path, PATH_MAX, "%s%s/%s", cmd->dev_dir,
 397                                  lp->vg_name, lp->lv_name) < 0) {
 398                         log_error("Couldn't create LV path for %s",
 399                                   lp->lv_name);
 400                         return ECMD_FAILED;
 401                 }
 402
 403                 if (lvm_snprintf(size_buf, SIZE_BUF, "%" PRIu64,
 404                                  (uint64_t) lp->extents * vg->extent_size / 2)
 405                                  < 0) {
 406                         log_error("Couldn't generate new LV size string");
 407                         return ECMD_FAILED;
 408                 }
 409
 410                 if (!lp->nofsck) {
 411                         if (!exec_cmd("fsadm", "check", lv_path, NULL)) {
 412                                 stack;
 413                                 return ECMD_FAILED;
 414                         }
 415                 }
 416
 417                 if (lp->resize == LV_REDUCE) {
 418                         if (!exec_cmd("fsadm", "resize", lv_path, size_buf)) {
 419                                 stack;
 420                                 return ECMD_FAILED;
 421                         }
 422                 }
 423         }
 424
 425         if (!archive(vg)) {
 426                 stack;
 427                 return ECMD_FAILED;
 428         }
 429
 430         log_print("%sing logical volume %s to %s",
 431                   (lp->resize == LV_REDUCE) ? "Reduc" : "Extend",
 432                   lp->lv_name,
 433                   display_size(cmd, (uint64_t) lp->extents * vg->extent_size,
 434                                SIZE_SHORT));
 435
 436         if (lp->resize == LV_REDUCE) {
 437                 if (!lv_reduce(vg->fid, lv, lv->le_count - lp->extents)) {
 438                         stack;
 439                         return ECMD_FAILED;
 440                 }
 441         } else if (!lv_extend(vg->fid, lv, lp->segtype, lp->stripes,
 442                                lp->stripe_size, 0u,
 443                                lp->extents - lv->le_count,
 444                                NULL, 0u, 0u, pvh, alloc)) {
 445                 stack;
 446                 return ECMD_FAILED;
 447         }
 448
 449         /* store vg on disk(s) */
 450         if (!vg_write(vg)) {
 451                 stack;
 452                 return ECMD_FAILED;
 453         }
 454
 455         backup(vg);
 456
 457         /* If snapshot, must suspend all associated devices */
 458         if ((snap = find_cow(lv)))
 459                 lock_lvid = snap->origin->lvid.s;
 460         else
 461                 lock_lvid = lv->lvid.s;
 462
 463         if (!suspend_lv(cmd, lock_lvid)) {
 464                 log_error("Failed to suspend %s", lp->lv_name);
 465                 vg_revert(vg);
 466                 return ECMD_FAILED;
 467         }
 468
 469         if (!vg_commit(vg)) {
 470                 stack;
 471                 resume_lv(cmd, lock_lvid);
 472                 return ECMD_FAILED;
 473         }
 474
 475         if (!resume_lv(cmd, lock_lvid)) {
 476                 log_error("Problem reactivating %s", lp->lv_name);
 477                 return ECMD_FAILED;
 478         }
 479
 480         log_print("Logical volume %s successfully resized", lp->lv_name);
 481
 482         if (lp->resizefs && (lp->resize == LV_EXTEND)) {
 483                 if (!exec_cmd("fsadm", "resize", lv_path, size_buf)) {
 484                         stack;
 485                         return ECMD_FAILED;
 486                 }
 487         }
 488
 489         return ECMD_PROCESSED;
 490 }
 491
 492 int lvresize(struct cmd_context *cmd, int argc, char **argv)
 493 {
 494         struct lvresize_params lp;
 495         int r;
 496
 497         memset(&lp, 0, sizeof(lp));
 498
 499         if (!_read_params(cmd, argc, argv, &lp))
 500                 return EINVALID_CMD_LINE;
 501
 502         log_verbose("Finding volume group %s", lp.vg_name);
 503         if (!lock_vol(cmd, lp.vg_name, LCK_VG_WRITE)) {
 504                 log_error("Can't get lock for %s", lp.vg_name);
 505                 return ECMD_FAILED;
 506         }
 507
 508         if (!(r = _lvresize(cmd, &lp)))
 509                 stack;
 510
 511         unlock_vg(cmd, lp.vg_name);
 512
 513         return r;
 514 }