sys/vfs/hammer/hammer_volume.c

   1 /*
   2  * Copyright (c) 2009 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com> and
   6  * Michael Neumann <mneumann@ntecs.de>
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the
  17  *    distribution.
  18  * 3. Neither the name of The DragonFly Project nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific, prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  24  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  25  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  26  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  28  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  29  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  30  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  31  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  32  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  *
  35  */
  36
  37 #include "hammer.h"
  38
  39 static int
  40 hammer_format_volume_header(struct hammer_mount *hmp,
  41         struct hammer_volume_ondisk *ondisk,
  42         const char *vol_name, int vol_no, int vol_count,
  43         int64_t vol_size, int64_t boot_area_size, int64_t mem_area_size);
  44
  45 static int
  46 hammer_update_volumes_header(hammer_transaction_t trans,
  47         int64_t total_bigblocks, int64_t empty_bigblocks);
  48
  49 static int
  50 hammer_do_reblock(hammer_transaction_t trans, hammer_inode_t ip);
  51
  52 static int
  53 hammer_format_freemap(hammer_transaction_t trans, hammer_volume_t volume);
  54
  55 static int
  56 hammer_free_freemap(hammer_transaction_t trans, hammer_volume_t volume);
  57
  58 static int
  59 hammer_count_bigblocks(hammer_mount_t hmp, hammer_volume_t volume,
  60         int64_t *total_bigblocks, int64_t *empty_bigblocks);
  61
  62 int
  63 hammer_ioc_volume_add(hammer_transaction_t trans, hammer_inode_t ip,
  64                 struct hammer_ioc_volume *ioc)
  65 {
  66         struct hammer_mount *hmp = trans->hmp;
  67         struct mount *mp = hmp->mp;
  68         struct hammer_volume_ondisk ondisk;
  69         hammer_volume_t volume;
  70         int64_t total_bigblocks, empty_bigblocks;
  71         int free_vol_no = 0;
  72         int error;
  73
  74         if (mp->mnt_flag & MNT_RDONLY) {
  75                 hmkprintf(hmp, "Cannot add volume to read-only HAMMER filesystem\n");
  76                 return (EINVAL);
  77         }
  78
  79         if (hmp->nvolumes >= HAMMER_MAX_VOLUMES) {
  80                 hmkprintf(hmp, "Max number of HAMMER volumes exceeded\n");
  81                 return (EINVAL);
  82         }
  83
  84         if (hammer_lock_ex_try(&hmp->volume_lock) != 0) {
  85                 hmkprintf(hmp, "Another volume operation is in progress!\n");
  86                 return (EAGAIN);
  87         }
  88
  89         /*
  90          * Find an unused volume number.
  91          */
  92         while (free_vol_no < HAMMER_MAX_VOLUMES &&
  93                 HAMMER_VOLUME_NUMBER_IS_SET(hmp, free_vol_no)) {
  94                 ++free_vol_no;
  95         }
  96         if (free_vol_no >= HAMMER_MAX_VOLUMES) {
  97                 hmkprintf(hmp, "Max number of HAMMER volumes exceeded\n");
  98                 error = EINVAL;
  99                 goto end;
 100         }
 101
 102         error = hammer_format_volume_header(
 103                 hmp,
 104                 &ondisk,
 105                 hmp->rootvol->ondisk->vol_name,
 106                 free_vol_no,
 107                 hmp->nvolumes+1,
 108                 ioc->vol_size,
 109                 ioc->boot_area_size,
 110                 ioc->mem_area_size);
 111         if (error)
 112                 goto end;
 113
 114         error = hammer_install_volume(hmp, ioc->device_name, NULL, &ondisk);
 115         if (error)
 116                 goto end;
 117
 118         hammer_sync_lock_sh(trans);
 119         hammer_lock_ex(&hmp->blkmap_lock);
 120
 121         volume = hammer_get_volume(hmp, free_vol_no, &error);
 122         KKASSERT(volume != NULL && error == 0);
 123
 124         error = hammer_format_freemap(trans, volume);
 125         KKASSERT(error == 0);
 126
 127         error = hammer_count_bigblocks(hmp, volume,
 128                         &total_bigblocks, &empty_bigblocks);
 129         KKASSERT(error == 0);
 130         KKASSERT(total_bigblocks == empty_bigblocks);
 131
 132         hammer_rel_volume(volume, 0);
 133
 134         ++hmp->nvolumes;
 135         error = hammer_update_volumes_header(trans,
 136                         total_bigblocks, empty_bigblocks);
 137         KKASSERT(error == 0);
 138
 139         hammer_unlock(&hmp->blkmap_lock);
 140         hammer_sync_unlock(trans);
 141
 142         KKASSERT(error == 0);
 143 end:
 144         hammer_unlock(&hmp->volume_lock);
 145         if (error)
 146                 hmkprintf(hmp, "An error occurred: %d\n", error);
 147         return (error);
 148 }
 149
 150
 151 /*
 152  * Remove a volume.
 153  */
 154 int
 155 hammer_ioc_volume_del(hammer_transaction_t trans, hammer_inode_t ip,
 156                 struct hammer_ioc_volume *ioc)
 157 {
 158         struct hammer_mount *hmp = trans->hmp;
 159         struct mount *mp = hmp->mp;
 160         struct hammer_volume_ondisk ondisk;
 161         hammer_volume_t volume;
 162         int64_t total_bigblocks, empty_bigblocks;
 163         int vol_no;
 164         int error = 0;
 165
 166         if (mp->mnt_flag & MNT_RDONLY) {
 167                 hmkprintf(hmp, "Cannot del volume from read-only HAMMER filesystem\n");
 168                 return (EINVAL);
 169         }
 170
 171         if (hmp->nvolumes <= 1) {
 172                 hmkprintf(hmp, "No HAMMER volume to delete\n");
 173                 return (EINVAL);
 174         }
 175
 176         if (hammer_lock_ex_try(&hmp->volume_lock) != 0) {
 177                 hmkprintf(hmp, "Another volume operation is in progress!\n");
 178                 return (EAGAIN);
 179         }
 180
 181         /*
 182          * find volume by volname
 183          */
 184         volume = NULL;
 185         HAMMER_VOLUME_NUMBER_FOREACH(hmp, vol_no) {
 186                 volume = hammer_get_volume(hmp, vol_no, &error);
 187                 KKASSERT(volume != NULL && error == 0);
 188                 if (strcmp(volume->vol_name, ioc->device_name) == 0) {
 189                         break;
 190                 }
 191                 hammer_rel_volume(volume, 0);
 192                 volume = NULL;
 193         }
 194
 195         if (volume == NULL) {
 196                 hmkprintf(hmp, "Couldn't find volume\n");
 197                 error = EINVAL;
 198                 goto end;
 199         }
 200
 201         if (volume == trans->rootvol) {
 202                 hmkprintf(hmp, "Cannot remove root-volume\n");
 203                 hammer_rel_volume(volume, 0);
 204                 error = EINVAL;
 205                 goto end;
 206         }
 207
 208         /*
 209          * Reblock filesystem if the volume is not empty
 210          */
 211         hmp->volume_to_remove = volume->vol_no;
 212
 213         error = hammer_count_bigblocks(hmp, volume,
 214                         &total_bigblocks, &empty_bigblocks);
 215         KKASSERT(error == 0);
 216
 217         if (total_bigblocks == empty_bigblocks) {
 218                 hmkprintf(hmp, "%s is already empty\n", volume->vol_name);
 219         } else {
 220                 error = hammer_do_reblock(trans, ip);
 221                 if (error) {
 222                         hmp->volume_to_remove = -1;
 223                         hammer_rel_volume(volume, 0);
 224                         goto end;
 225                 }
 226         }
 227
 228         /*
 229          * Sync filesystem
 230          */
 231         hammer_flush_dirty(hmp, 30);
 232
 233         hammer_sync_lock_sh(trans);
 234         hammer_lock_ex(&hmp->blkmap_lock);
 235
 236         error = hammer_count_bigblocks(hmp, volume,
 237                         &total_bigblocks, &empty_bigblocks);
 238         KKASSERT(error == 0);
 239
 240         error = hammer_free_freemap(trans, volume);
 241         if (error) {
 242                 hmkprintf(hmp, "Failed to free volume: ");
 243                 if (error == EBUSY)
 244                         kprintf("Volume %d not empty\n", volume->vol_no);
 245                 else
 246                         kprintf("%d\n", error);
 247                 hmp->volume_to_remove = -1;
 248                 hammer_rel_volume(volume, 0);
 249                 goto end1;
 250         }
 251         hammer_rel_volume(volume, 0);
 252
 253         /*
 254          * XXX: Temporary solution for
 255          * http://lists.dragonflybsd.org/pipermail/kernel/2015-August/175027.html
 256          */
 257         hammer_unlock(&hmp->blkmap_lock);
 258         hammer_sync_unlock(trans);
 259         hammer_flusher_sync(hmp); /* 1 */
 260         hammer_flusher_sync(hmp); /* 2 */
 261         hammer_flusher_sync(hmp); /* 3 */
 262         hammer_sync_lock_sh(trans);
 263         hammer_lock_ex(&hmp->blkmap_lock);
 264
 265         /*
 266          * Unload buffers
 267          */
 268         RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL,
 269                 hammer_unload_buffer, volume);
 270
 271         bzero(&ondisk, sizeof(ondisk));
 272         error = hammer_unload_volume(volume, &ondisk);
 273         if (error == -1) {
 274                 hmkprintf(hmp, "Failed to unload volume\n");
 275                 goto end1;
 276         }
 277
 278         --hmp->nvolumes;
 279         error = hammer_update_volumes_header(trans,
 280                         -total_bigblocks, -empty_bigblocks);
 281         KKASSERT(error == 0);
 282         hmp->volume_to_remove = -1;
 283
 284 end1:
 285         hammer_unlock(&hmp->blkmap_lock);
 286         hammer_sync_unlock(trans);
 287
 288 end:
 289         hammer_unlock(&hmp->volume_lock);
 290         if (error)
 291                 hmkprintf(hmp, "An error occurred: %d\n", error);
 292         return (error);
 293 }
 294
 295
 296 int
 297 hammer_ioc_volume_list(hammer_transaction_t trans, hammer_inode_t ip,
 298     struct hammer_ioc_volume_list *ioc)
 299 {
 300         struct hammer_mount *hmp = trans->hmp;
 301         hammer_volume_t volume;
 302         int error = 0;
 303         int i, len, cnt = 0;
 304
 305         if (hammer_lock_ex_try(&hmp->volume_lock) != 0) {
 306                 hmkprintf(hmp, "Another volume operation is in progress!\n");
 307                 return (EAGAIN);
 308         }
 309
 310         HAMMER_VOLUME_NUMBER_FOREACH(hmp, i) {
 311                 if (cnt >= ioc->nvols)
 312                         break;
 313                 volume = hammer_get_volume(hmp, i, &error);
 314                 KKASSERT(volume != NULL && error == 0);
 315
 316                 len = strlen(volume->vol_name) + 1;
 317                 KKASSERT(len <= MAXPATHLEN);
 318
 319                 error = copyout(volume->vol_name, ioc->vols[cnt].device_name,
 320                                 len);
 321                 hammer_rel_volume(volume, 0);
 322                 if (error)
 323                         goto end;
 324                 cnt++;
 325         }
 326         ioc->nvols = cnt;
 327
 328 end:
 329         hammer_unlock(&hmp->volume_lock);
 330         return (error);
 331 }
 332
 333 static
 334 int
 335 hammer_do_reblock(hammer_transaction_t trans, hammer_inode_t ip)
 336 {
 337         struct hammer_mount *hmp = trans->hmp;
 338         int error;
 339         int vol_no;
 340
 341         struct hammer_ioc_reblock reblock;
 342         bzero(&reblock, sizeof(reblock));
 343
 344         vol_no = trans->hmp->volume_to_remove;
 345         KKASSERT(vol_no != -1);
 346
 347         reblock.key_beg.localization = HAMMER_MIN_LOCALIZATION;
 348         reblock.key_beg.obj_id = HAMMER_MIN_OBJID;
 349         reblock.key_end.localization = HAMMER_MAX_LOCALIZATION;
 350         reblock.key_end.obj_id = HAMMER_MAX_OBJID;
 351         reblock.head.flags = HAMMER_IOC_DO_FLAGS;
 352         reblock.free_level = 0; /* reblock all big-blocks */
 353         reblock.allpfs = 1;     /* reblock all PFS */
 354         reblock.vol_no = vol_no;
 355
 356         hmkprintf(hmp, "reblock started\n");
 357         error = hammer_ioc_reblock(trans, ip, &reblock);
 358
 359         if (reblock.head.flags & HAMMER_IOC_HEAD_INTR) {
 360                 error = EINTR;
 361         }
 362
 363         if (error) {
 364                 if (error == EINTR) {
 365                         hmkprintf(hmp, "reblock was interrupted\n");
 366                 } else {
 367                         hmkprintf(hmp, "reblock failed: %d\n", error);
 368                 }
 369                 return(error);
 370         }
 371
 372         return(0);
 373 }
 374
 375 static int
 376 hammer_format_freemap(hammer_transaction_t trans, hammer_volume_t volume)
 377 {
 378         struct hammer_mount *hmp = trans->hmp;
 379         struct hammer_volume_ondisk *ondisk;
 380         hammer_blockmap_t freemap;
 381         hammer_off_t alloc_offset;
 382         hammer_off_t phys_offset;
 383         hammer_off_t block_offset;
 384         hammer_off_t layer1_offset;
 385         hammer_off_t layer2_offset;
 386         hammer_off_t vol_free_end;
 387         hammer_off_t aligned_vol_free_end;
 388         struct hammer_blockmap_layer1 *layer1;
 389         struct hammer_blockmap_layer2 *layer2;
 390         hammer_buffer_t buffer1 = NULL;
 391         hammer_buffer_t buffer2 = NULL;
 392         int64_t vol_buf_size;
 393         int64_t layer1_count = 0;
 394         int error = 0;
 395
 396         KKASSERT(volume->vol_no != HAMMER_ROOT_VOLNO);
 397
 398         ondisk = volume->ondisk;
 399         vol_buf_size = ondisk->vol_buf_end - ondisk->vol_buf_beg;
 400         vol_free_end = HAMMER_ENCODE_RAW_BUFFER(ondisk->vol_no,
 401                         vol_buf_size & ~HAMMER_BIGBLOCK_MASK64);
 402         aligned_vol_free_end = (vol_free_end + HAMMER_BLOCKMAP_LAYER2_MASK)
 403                         & ~HAMMER_BLOCKMAP_LAYER2_MASK;
 404
 405         freemap = &hmp->blockmap[HAMMER_ZONE_FREEMAP_INDEX];
 406         alloc_offset = HAMMER_ENCODE_RAW_BUFFER(volume->vol_no, 0);
 407
 408         hmkprintf(hmp, "Initialize freemap volume %d\n", volume->vol_no);
 409
 410         for (phys_offset = HAMMER_ENCODE_RAW_BUFFER(volume->vol_no, 0);
 411              phys_offset < aligned_vol_free_end;
 412              phys_offset += HAMMER_BLOCKMAP_LAYER2) {
 413                 layer1_offset = freemap->phys_offset +
 414                                 HAMMER_BLOCKMAP_LAYER1_OFFSET(phys_offset);
 415                 layer1 = hammer_bread(hmp, layer1_offset, &error, &buffer1);
 416                 if (error)
 417                         goto end;
 418                 if (layer1->phys_offset == HAMMER_BLOCKMAP_UNAVAIL) {
 419                         hammer_modify_buffer(trans, buffer1, layer1, sizeof(*layer1));
 420                         bzero(layer1, sizeof(*layer1));
 421                         layer1->phys_offset = alloc_offset;
 422                         layer1->blocks_free = 0;
 423                         layer1->layer1_crc = crc32(layer1, HAMMER_LAYER1_CRCSIZE);
 424                         hammer_modify_buffer_done(buffer1);
 425                         alloc_offset += HAMMER_BIGBLOCK_SIZE;
 426                 }
 427         }
 428
 429         for (phys_offset = HAMMER_ENCODE_RAW_BUFFER(volume->vol_no, 0);
 430              phys_offset < aligned_vol_free_end;
 431              phys_offset += HAMMER_BLOCKMAP_LAYER2) {
 432                 layer1_count = 0;
 433                 layer1_offset = freemap->phys_offset +
 434                                 HAMMER_BLOCKMAP_LAYER1_OFFSET(phys_offset);
 435                 layer1 = hammer_bread(hmp, layer1_offset, &error, &buffer1);
 436                 if (error)
 437                         goto end;
 438                 KKASSERT(layer1->phys_offset != HAMMER_BLOCKMAP_UNAVAIL);
 439
 440                 for (block_offset = 0;
 441                      block_offset < HAMMER_BLOCKMAP_LAYER2;
 442                      block_offset += HAMMER_BIGBLOCK_SIZE) {
 443                         layer2_offset = layer1->phys_offset +
 444                                         HAMMER_BLOCKMAP_LAYER2_OFFSET(block_offset);
 445                         layer2 = hammer_bread(hmp, layer2_offset, &error, &buffer2);
 446                         if (error)
 447                                 goto end;
 448
 449                         hammer_modify_buffer(trans, buffer2, layer2, sizeof(*layer2));
 450                         bzero(layer2, sizeof(*layer2));
 451
 452                         if (phys_offset + block_offset < alloc_offset) {
 453                                 layer2->zone = HAMMER_ZONE_FREEMAP_INDEX;
 454                                 layer2->append_off = HAMMER_BIGBLOCK_SIZE;
 455                                 layer2->bytes_free = 0;
 456                         } else if (phys_offset + block_offset < vol_free_end) {
 457                                 layer2->zone = 0;
 458                                 layer2->append_off = 0;
 459                                 layer2->bytes_free = HAMMER_BIGBLOCK_SIZE;
 460                                 ++layer1_count;
 461                         } else {
 462                                 layer2->zone = HAMMER_ZONE_UNAVAIL_INDEX;
 463                                 layer2->append_off = HAMMER_BIGBLOCK_SIZE;
 464                                 layer2->bytes_free = 0;
 465                         }
 466
 467                         layer2->entry_crc = crc32(layer2, HAMMER_LAYER2_CRCSIZE);
 468                         hammer_modify_buffer_done(buffer2);
 469                 }
 470
 471                 hammer_modify_buffer(trans, buffer1, layer1, sizeof(*layer1));
 472                 layer1->blocks_free += layer1_count;
 473                 layer1->layer1_crc = crc32(layer1, HAMMER_LAYER1_CRCSIZE);
 474                 hammer_modify_buffer_done(buffer1);
 475         }
 476
 477 end:
 478         if (buffer1)
 479                 hammer_rel_buffer(buffer1, 0);
 480         if (buffer2)
 481                 hammer_rel_buffer(buffer2, 0);
 482
 483         return error;
 484 }
 485
 486 static int
 487 hammer_free_freemap(hammer_transaction_t trans, hammer_volume_t volume)
 488 {
 489         struct hammer_mount *hmp = trans->hmp;
 490         struct hammer_volume_ondisk *ondisk;
 491         hammer_blockmap_t freemap;
 492         hammer_off_t phys_offset;
 493         hammer_off_t block_offset;
 494         hammer_off_t layer1_offset;
 495         hammer_off_t layer2_offset;
 496         hammer_off_t vol_free_end;
 497         hammer_off_t aligned_vol_free_end;
 498         struct hammer_blockmap_layer1 *layer1;
 499         struct hammer_blockmap_layer2 *layer2;
 500         hammer_buffer_t buffer1 = NULL;
 501         hammer_buffer_t buffer2 = NULL;
 502         int64_t vol_buf_size;
 503         int64_t layer1_count = 0;
 504         int error = 0;
 505
 506         KKASSERT(volume->vol_no != HAMMER_ROOT_VOLNO);
 507
 508         ondisk = volume->ondisk;
 509         vol_buf_size = ondisk->vol_buf_end - ondisk->vol_buf_beg;
 510         vol_free_end = HAMMER_ENCODE_RAW_BUFFER(ondisk->vol_no,
 511                         vol_buf_size & ~HAMMER_BIGBLOCK_MASK64);
 512         aligned_vol_free_end = (vol_free_end + HAMMER_BLOCKMAP_LAYER2_MASK)
 513                         & ~HAMMER_BLOCKMAP_LAYER2_MASK;
 514
 515         freemap = &hmp->blockmap[HAMMER_ZONE_FREEMAP_INDEX];
 516
 517         hmkprintf(hmp, "Free freemap volume %d\n", volume->vol_no);
 518
 519         for (phys_offset = HAMMER_ENCODE_RAW_BUFFER(volume->vol_no, 0);
 520              phys_offset < aligned_vol_free_end;
 521              phys_offset += HAMMER_BLOCKMAP_LAYER2) {
 522                 layer1_count = 0;
 523                 layer1_offset = freemap->phys_offset +
 524                                 HAMMER_BLOCKMAP_LAYER1_OFFSET(phys_offset);
 525                 layer1 = hammer_bread(hmp, layer1_offset, &error, &buffer1);
 526                 if (error)
 527                         goto end;
 528                 KKASSERT(layer1->phys_offset != HAMMER_BLOCKMAP_UNAVAIL);
 529
 530                 for (block_offset = 0;
 531                      block_offset < HAMMER_BLOCKMAP_LAYER2;
 532                      block_offset += HAMMER_BIGBLOCK_SIZE) {
 533                         layer2_offset = layer1->phys_offset +
 534                                         HAMMER_BLOCKMAP_LAYER2_OFFSET(block_offset);
 535                         layer2 = hammer_bread(hmp, layer2_offset, &error, &buffer2);
 536                         if (error)
 537                                 goto end;
 538
 539                         switch (layer2->zone) {
 540                         case HAMMER_ZONE_UNDO_INDEX:
 541                                 KKASSERT(0);
 542                         case HAMMER_ZONE_FREEMAP_INDEX:
 543                         case HAMMER_ZONE_UNAVAIL_INDEX:
 544                                 continue;
 545                         default:
 546                                 KKASSERT(phys_offset + block_offset < aligned_vol_free_end);
 547                                 if (layer2->append_off == 0 &&
 548                                     layer2->bytes_free == HAMMER_BIGBLOCK_SIZE)
 549                                         continue;
 550                                 break;
 551                         }
 552                         return EBUSY;  /* Not empty */
 553                 }
 554         }
 555
 556         for (phys_offset = HAMMER_ENCODE_RAW_BUFFER(volume->vol_no, 0);
 557              phys_offset < aligned_vol_free_end;
 558              phys_offset += HAMMER_BLOCKMAP_LAYER2) {
 559                 layer1_count = 0;
 560                 layer1_offset = freemap->phys_offset +
 561                                 HAMMER_BLOCKMAP_LAYER1_OFFSET(phys_offset);
 562                 layer1 = hammer_bread(hmp, layer1_offset, &error, &buffer1);
 563                 if (error)
 564                         goto end;
 565                 KKASSERT(layer1->phys_offset != HAMMER_BLOCKMAP_UNAVAIL);
 566
 567                 hammer_modify_buffer(trans, buffer1, layer1, sizeof(*layer1));
 568                 bzero(layer1, sizeof(*layer1));
 569                 layer1->phys_offset = HAMMER_BLOCKMAP_UNAVAIL;
 570                 layer1->layer1_crc = crc32(layer1, HAMMER_LAYER1_CRCSIZE);
 571                 hammer_modify_buffer_done(buffer1);
 572         }
 573
 574 end:
 575         if (buffer1)
 576                 hammer_rel_buffer(buffer1, 0);
 577         if (buffer2)
 578                 hammer_rel_buffer(buffer2, 0);
 579
 580         return error;
 581 }
 582
 583 static int
 584 hammer_format_volume_header(struct hammer_mount *hmp,
 585         struct hammer_volume_ondisk *ondisk,
 586         const char *vol_name, int vol_no, int vol_count,
 587         int64_t vol_size, int64_t boot_area_size, int64_t mem_area_size)
 588 {
 589         int64_t vol_alloc;
 590
 591         KKASSERT(HAMMER_BUFSIZE >= sizeof(struct hammer_volume_ondisk));
 592
 593         bzero(ondisk, sizeof(struct hammer_volume_ondisk));
 594         ksnprintf(ondisk->vol_name, sizeof(ondisk->vol_name), "%s", vol_name);
 595         ondisk->vol_fstype = hmp->rootvol->ondisk->vol_fstype;
 596         ondisk->vol_signature = HAMMER_FSBUF_VOLUME;
 597         ondisk->vol_fsid = hmp->fsid;
 598         ondisk->vol_rootvol = hmp->rootvol->vol_no;
 599         ondisk->vol_no = vol_no;
 600         ondisk->vol_count = vol_count;
 601         ondisk->vol_version = hmp->version;
 602
 603         /*
 604          * Reserve space for (future) header junk, copy volume relative
 605          * offset from the existing root volume.
 606          */
 607         vol_alloc = hmp->rootvol->ondisk->vol_bot_beg;
 608         ondisk->vol_bot_beg = vol_alloc;
 609         vol_alloc += boot_area_size;
 610         ondisk->vol_mem_beg = vol_alloc;
 611         vol_alloc += mem_area_size;
 612
 613         /*
 614          * The remaining area is the zone 2 buffer allocation area.
 615          */
 616         ondisk->vol_buf_beg = vol_alloc;
 617         ondisk->vol_buf_end = vol_size & ~(int64_t)HAMMER_BUFMASK;
 618
 619         if (ondisk->vol_buf_end < ondisk->vol_buf_beg) {
 620                 hmkprintf(hmp, "volume %d %s is too small to hold the volume header\n",
 621                      ondisk->vol_no, ondisk->vol_name);
 622                 return(EFTYPE);
 623         }
 624
 625         ondisk->vol_nblocks = (ondisk->vol_buf_end - ondisk->vol_buf_beg) /
 626                               HAMMER_BUFSIZE;
 627         ondisk->vol_blocksize = HAMMER_BUFSIZE;
 628         return(0);
 629 }
 630
 631 static int
 632 hammer_update_volumes_header(hammer_transaction_t trans,
 633         int64_t total_bigblocks, int64_t empty_bigblocks)
 634 {
 635         struct hammer_mount *hmp = trans->hmp;
 636         struct mount *mp = hmp->mp;
 637         hammer_volume_t volume;
 638         int vol_no;
 639         int error = 0;
 640
 641         /*
 642          * Set each volume's new value of the vol_count field.
 643          */
 644         HAMMER_VOLUME_NUMBER_FOREACH(hmp, vol_no) {
 645                 volume = hammer_get_volume(hmp, vol_no, &error);
 646                 KKASSERT(volume != NULL && error == 0);
 647                 hammer_modify_volume_field(trans, volume, vol_count);
 648                 volume->ondisk->vol_count = hmp->nvolumes;
 649                 hammer_modify_volume_done(volume);
 650
 651                 /*
 652                  * Only changes to the header of the root volume
 653                  * are automatically flushed to disk. For all
 654                  * other volumes that we modify we do it here.
 655                  *
 656                  * No interlock is needed, volume buffers are not
 657                  * messed with by bioops.
 658                  */
 659                 if (volume != trans->rootvol && volume->io.modified) {
 660                         hammer_crc_set_volume(volume->ondisk);
 661                         hammer_io_flush(&volume->io, 0);
 662                 }
 663
 664                 hammer_rel_volume(volume, 0);
 665         }
 666
 667         /*
 668          * Update the total number of big-blocks.
 669          */
 670         hammer_modify_volume_field(trans, trans->rootvol, vol0_stat_bigblocks);
 671         trans->rootvol->ondisk->vol0_stat_bigblocks += total_bigblocks;
 672         hammer_modify_volume_done(trans->rootvol);
 673
 674         /*
 675          * Big-block count changed so recompute the total number of blocks.
 676          */
 677         mp->mnt_stat.f_blocks = trans->rootvol->ondisk->vol0_stat_bigblocks *
 678                                 HAMMER_BUFFERS_PER_BIGBLOCK;
 679         mp->mnt_vstat.f_blocks = trans->rootvol->ondisk->vol0_stat_bigblocks *
 680                                 HAMMER_BUFFERS_PER_BIGBLOCK;
 681
 682         /*
 683          * Update the total number of free big-blocks.
 684          */
 685         hammer_modify_volume_field(trans, trans->rootvol,
 686                 vol0_stat_freebigblocks);
 687         trans->rootvol->ondisk->vol0_stat_freebigblocks += empty_bigblocks;
 688         hammer_modify_volume_done(trans->rootvol);
 689
 690         /*
 691          * Update the copy in hmp.
 692          */
 693         hmp->copy_stat_freebigblocks =
 694                 trans->rootvol->ondisk->vol0_stat_freebigblocks;
 695
 696         return(error);
 697 }
 698
 699 /*
 700  * Count total big-blocks and empty big-blocks within the volume.
 701  * The volume must be a non-root volume.
 702  *
 703  * Note that total big-blocks doesn't include big-blocks for layer2
 704  * (and obviously layer1 and undomap).  This is requirement of the
 705  * volume header and this function is to retrieve that information.
 706  */
 707 static int
 708 hammer_count_bigblocks(hammer_mount_t hmp, hammer_volume_t volume,
 709         int64_t *total_bigblocks, int64_t *empty_bigblocks)
 710 {
 711         struct hammer_volume_ondisk *ondisk;
 712         hammer_blockmap_t freemap;
 713         hammer_off_t phys_offset;
 714         hammer_off_t block_offset;
 715         hammer_off_t layer1_offset;
 716         hammer_off_t layer2_offset;
 717         hammer_off_t vol_free_end;
 718         hammer_off_t aligned_vol_free_end;
 719         struct hammer_blockmap_layer1 *layer1;
 720         struct hammer_blockmap_layer2 *layer2;
 721         hammer_buffer_t buffer1 = NULL;
 722         hammer_buffer_t buffer2 = NULL;
 723         int64_t vol_buf_size;
 724         int64_t total = 0;
 725         int64_t empty = 0;
 726         int error = 0;
 727
 728         KKASSERT(volume->vol_no != HAMMER_ROOT_VOLNO);
 729
 730         ondisk = volume->ondisk;
 731         vol_buf_size = ondisk->vol_buf_end - ondisk->vol_buf_beg;
 732         vol_free_end = HAMMER_ENCODE_RAW_BUFFER(ondisk->vol_no,
 733                         vol_buf_size & ~HAMMER_BIGBLOCK_MASK64);
 734         aligned_vol_free_end = (vol_free_end + HAMMER_BLOCKMAP_LAYER2_MASK)
 735                         & ~HAMMER_BLOCKMAP_LAYER2_MASK;
 736
 737         freemap = &hmp->blockmap[HAMMER_ZONE_FREEMAP_INDEX];
 738
 739         for (phys_offset = HAMMER_ENCODE_RAW_BUFFER(volume->ondisk->vol_no, 0);
 740              phys_offset < aligned_vol_free_end;
 741              phys_offset += HAMMER_BLOCKMAP_LAYER2) {
 742                 layer1_offset = freemap->phys_offset +
 743                                 HAMMER_BLOCKMAP_LAYER1_OFFSET(phys_offset);
 744                 layer1 = hammer_bread(hmp, layer1_offset, &error, &buffer1);
 745                 if (error)
 746                         goto end;
 747
 748                 for (block_offset = 0;
 749                      block_offset < HAMMER_BLOCKMAP_LAYER2;
 750                      block_offset += HAMMER_BIGBLOCK_SIZE) {
 751                         layer2_offset = layer1->phys_offset +
 752                                         HAMMER_BLOCKMAP_LAYER2_OFFSET(block_offset);
 753                         layer2 = hammer_bread(hmp, layer2_offset, &error, &buffer2);
 754                         if (error)
 755                                 goto end;
 756
 757                         switch (layer2->zone) {
 758                         case HAMMER_ZONE_UNDO_INDEX:
 759                                 KKASSERT(0);
 760                         case HAMMER_ZONE_FREEMAP_INDEX:
 761                         case HAMMER_ZONE_UNAVAIL_INDEX:
 762                                 continue;
 763                         default:
 764                                 KKASSERT(phys_offset + block_offset < aligned_vol_free_end);
 765                                 total++;
 766                                 if (layer2->append_off == 0 &&
 767                                     layer2->bytes_free == HAMMER_BIGBLOCK_SIZE)
 768                                         empty++;
 769                                 break;
 770                         }
 771                 }
 772         }
 773
 774         hmkprintf(hmp, "big-blocks total=%jd empty=%jd\n", total, empty);
 775         *total_bigblocks = total;
 776         *empty_bigblocks = empty;
 777 end:
 778         if (buffer1)
 779                 hammer_rel_buffer(buffer1, 0);
 780         if (buffer2)
 781                 hammer_rel_buffer(buffer2, 0);
 782
 783         return error;
 784 }