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 struct bigblock_stat {
  40         int64_t total_bigblocks;
  41         int64_t total_free_bigblocks;
  42         int64_t counter;
  43 };
  44
  45 static int
  46 hammer_format_volume_header(struct hammer_mount *hmp,
  47         struct hammer_volume_ondisk *ondisk,
  48         const char *vol_name, int vol_no, int vol_count,
  49         int64_t vol_size, int64_t boot_area_size, int64_t mem_area_size);
  50
  51 static int
  52 hammer_update_volumes_header(hammer_transaction_t trans,
  53         struct bigblock_stat *stat);
  54
  55 static int
  56 hammer_do_reblock(hammer_transaction_t trans, hammer_inode_t ip);
  57
  58 static int
  59 hammer_format_freemap(hammer_transaction_t trans, hammer_volume_t volume,
  60         struct bigblock_stat *stat);
  61
  62 static int
  63 hammer_free_freemap(hammer_transaction_t trans, hammer_volume_t volume,
  64         struct bigblock_stat *stat);
  65
  66 static int
  67 hammer_test_free_freemap(hammer_transaction_t trans, hammer_volume_t volume);
  68
  69 int
  70 hammer_ioc_volume_add(hammer_transaction_t trans, hammer_inode_t ip,
  71                 struct hammer_ioc_volume *ioc)
  72 {
  73         struct hammer_mount *hmp = trans->hmp;
  74         struct mount *mp = hmp->mp;
  75         struct hammer_volume_ondisk ondisk;
  76         struct bigblock_stat stat;
  77         hammer_volume_t volume;
  78         int free_vol_no = 0;
  79         int error;
  80
  81         if (mp->mnt_flag & MNT_RDONLY) {
  82                 hmkprintf(hmp, "Cannot add volume to read-only HAMMER filesystem\n");
  83                 return (EINVAL);
  84         }
  85
  86         if (hmp->nvolumes >= HAMMER_MAX_VOLUMES) {
  87                 hmkprintf(hmp, "Max number of HAMMER volumes exceeded\n");
  88                 return (EINVAL);
  89         }
  90
  91         if (hammer_lock_ex_try(&hmp->volume_lock) != 0) {
  92                 hmkprintf(hmp, "Another volume operation is in progress!\n");
  93                 return (EAGAIN);
  94         }
  95
  96         /*
  97          * Find an unused volume number.
  98          */
  99         while (free_vol_no < HAMMER_MAX_VOLUMES &&
 100                 HAMMER_VOLUME_NUMBER_IS_SET(hmp, free_vol_no)) {
 101                 ++free_vol_no;
 102         }
 103         if (free_vol_no >= HAMMER_MAX_VOLUMES) {
 104                 hmkprintf(hmp, "Max number of HAMMER volumes exceeded\n");
 105                 error = EINVAL;
 106                 goto end;
 107         }
 108
 109         error = hammer_format_volume_header(
 110                 hmp,
 111                 &ondisk,
 112                 hmp->rootvol->ondisk->vol_name,
 113                 free_vol_no,
 114                 hmp->nvolumes+1,
 115                 ioc->vol_size,
 116                 ioc->boot_area_size,
 117                 ioc->mem_area_size);
 118         if (error)
 119                 goto end;
 120
 121         error = hammer_install_volume(hmp, ioc->device_name, NULL, &ondisk);
 122         if (error)
 123                 goto end;
 124
 125         hammer_sync_lock_sh(trans);
 126         hammer_lock_ex(&hmp->blkmap_lock);
 127
 128         volume = hammer_get_volume(hmp, free_vol_no, &error);
 129         KKASSERT(volume != NULL && error == 0);
 130
 131         error = hammer_format_freemap(trans, volume, &stat);
 132         KKASSERT(error == 0);
 133         hammer_rel_volume(volume, 0);
 134
 135         ++hmp->nvolumes;
 136         error = hammer_update_volumes_header(trans, &stat);
 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         struct bigblock_stat stat;
 162         hammer_volume_t volume;
 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         if (hammer_test_free_freemap(trans, volume)) {
 214                 error = hammer_do_reblock(trans, ip);
 215                 if (error) {
 216                         hmp->volume_to_remove = -1;
 217                         hammer_rel_volume(volume, 0);
 218                         goto end;
 219                 }
 220         }
 221
 222         /*
 223          * Sync filesystem
 224          */
 225         hammer_flush_dirty(hmp, 30);
 226
 227         hammer_sync_lock_sh(trans);
 228         hammer_lock_ex(&hmp->blkmap_lock);
 229
 230         /*
 231          * We use stat later to update rootvol's big-block stats
 232          */
 233         error = hammer_free_freemap(trans, volume, &stat);
 234         if (error) {
 235                 hmkprintf(hmp, "Failed to free volume: ");
 236                 if (error == EBUSY)
 237                         kprintf("Volume %d not empty\n", volume->vol_no);
 238                 else
 239                         kprintf("%d\n", error);
 240                 hmp->volume_to_remove = -1;
 241                 hammer_rel_volume(volume, 0);
 242                 goto end1;
 243         }
 244         hammer_rel_volume(volume, 0);
 245
 246         /*
 247          * Unload buffers
 248          */
 249         RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL,
 250                 hammer_unload_buffer, volume);
 251
 252         bzero(&ondisk, sizeof(ondisk));
 253         error = hammer_unload_volume(volume, &ondisk);
 254         if (error == -1) {
 255                 hmkprintf(hmp, "Failed to unload volume\n");
 256                 goto end1;
 257         }
 258
 259         --hmp->nvolumes;
 260         error = hammer_update_volumes_header(trans, &stat);
 261         KKASSERT(error == 0);
 262         hmp->volume_to_remove = -1;
 263
 264 end1:
 265         hammer_unlock(&hmp->blkmap_lock);
 266         hammer_sync_unlock(trans);
 267
 268 end:
 269         hammer_unlock(&hmp->volume_lock);
 270         if (error)
 271                 hmkprintf(hmp, "An error occurred: %d\n", error);
 272         return (error);
 273 }
 274
 275
 276 int
 277 hammer_ioc_volume_list(hammer_transaction_t trans, hammer_inode_t ip,
 278     struct hammer_ioc_volume_list *ioc)
 279 {
 280         struct hammer_mount *hmp = trans->hmp;
 281         hammer_volume_t volume;
 282         int error = 0;
 283         int i, len, cnt = 0;
 284
 285         if (hammer_lock_ex_try(&hmp->volume_lock) != 0) {
 286                 hmkprintf(hmp, "Another volume operation is in progress!\n");
 287                 return (EAGAIN);
 288         }
 289
 290         HAMMER_VOLUME_NUMBER_FOREACH(hmp, i) {
 291                 if (cnt >= ioc->nvols)
 292                         break;
 293                 volume = hammer_get_volume(hmp, i, &error);
 294                 KKASSERT(volume != NULL && error == 0);
 295
 296                 len = strlen(volume->vol_name) + 1;
 297                 KKASSERT(len <= MAXPATHLEN);
 298
 299                 error = copyout(volume->vol_name, ioc->vols[cnt].device_name,
 300                                 len);
 301                 hammer_rel_volume(volume, 0);
 302                 if (error)
 303                         goto end;
 304                 cnt++;
 305         }
 306         ioc->nvols = cnt;
 307
 308 end:
 309         hammer_unlock(&hmp->volume_lock);
 310         return (error);
 311 }
 312
 313 static
 314 int
 315 hammer_do_reblock(hammer_transaction_t trans, hammer_inode_t ip)
 316 {
 317         struct hammer_mount *hmp = trans->hmp;
 318         int error;
 319         int vol_no;
 320
 321         struct hammer_ioc_reblock reblock;
 322         bzero(&reblock, sizeof(reblock));
 323
 324         vol_no = trans->hmp->volume_to_remove;
 325         KKASSERT(vol_no != -1);
 326
 327         reblock.key_beg.localization = HAMMER_MIN_LOCALIZATION;
 328         reblock.key_beg.obj_id = HAMMER_MIN_OBJID;
 329         reblock.key_end.localization = HAMMER_MAX_LOCALIZATION;
 330         reblock.key_end.obj_id = HAMMER_MAX_OBJID;
 331         reblock.head.flags = HAMMER_IOC_DO_FLAGS;
 332         reblock.free_level = 0; /* reblock all big-blocks */
 333         reblock.allpfs = 1;     /* reblock all PFS */
 334         reblock.vol_no = vol_no;
 335
 336         hmkprintf(hmp, "reblock started\n");
 337         error = hammer_ioc_reblock(trans, ip, &reblock);
 338
 339         if (reblock.head.flags & HAMMER_IOC_HEAD_INTR) {
 340                 error = EINTR;
 341         }
 342
 343         if (error) {
 344                 if (error == EINTR) {
 345                         hmkprintf(hmp, "reblock was interrupted\n");
 346                 } else {
 347                         hmkprintf(hmp, "reblock failed: %d\n", error);
 348                 }
 349                 return(error);
 350         }
 351
 352         return(0);
 353 }
 354
 355 /*
 356  * Iterate over all usable L1 entries of the volume and
 357  * the corresponding L2 entries.
 358  */
 359 static int
 360 hammer_iterate_l1l2_entries(hammer_transaction_t trans, hammer_volume_t volume,
 361         int (*callback)(hammer_transaction_t, hammer_volume_t, hammer_buffer_t*,
 362                 struct hammer_blockmap_layer1*, struct hammer_blockmap_layer2*,
 363                 hammer_off_t, hammer_off_t, void*),
 364         void *data)
 365 {
 366         struct hammer_mount *hmp = trans->hmp;
 367         hammer_blockmap_t freemap = &hmp->blockmap[HAMMER_ZONE_FREEMAP_INDEX];
 368         int error = 0;
 369         hammer_off_t phys_off;
 370         hammer_off_t block_off;
 371         hammer_off_t layer1_off;
 372         hammer_off_t layer2_off;
 373         hammer_off_t aligned_buf_end_off;
 374         hammer_off_t aligned_vol_end_off;
 375         struct hammer_blockmap_layer1 *layer1;
 376         struct hammer_blockmap_layer2 *layer2;
 377         hammer_buffer_t buffer1 = NULL;
 378         hammer_buffer_t buffer2 = NULL;
 379
 380         /*
 381          * Calculate the usable size of the volume, which
 382          * must be aligned at a big-block (8 MB) boundary.
 383          */
 384         aligned_buf_end_off = HAMMER_ENCODE_RAW_BUFFER(volume->ondisk->vol_no,
 385                 (volume->ondisk->vol_buf_end - volume->ondisk->vol_buf_beg)
 386                 & ~HAMMER_BIGBLOCK_MASK64);
 387         aligned_vol_end_off = (aligned_buf_end_off + HAMMER_BLOCKMAP_LAYER2_MASK)
 388                 & ~HAMMER_BLOCKMAP_LAYER2_MASK;
 389
 390         /*
 391          * Iterate the volume's address space in chunks of 4 TB, where each
 392          * chunk consists of at least one physically available 8 MB big-block.
 393          *
 394          * For each chunk we need one L1 entry and one L2 big-block.
 395          * We use the first big-block of each chunk as L2 block.
 396          */
 397         for (phys_off = HAMMER_ENCODE_RAW_BUFFER(volume->ondisk->vol_no, 0);
 398              phys_off < aligned_vol_end_off;
 399              phys_off += HAMMER_BLOCKMAP_LAYER2) {
 400                 for (block_off = 0;
 401                      block_off < HAMMER_BLOCKMAP_LAYER2;
 402                      block_off += HAMMER_BIGBLOCK_SIZE) {
 403                         layer2_off = phys_off +
 404                                 HAMMER_BLOCKMAP_LAYER2_OFFSET(block_off);
 405                         layer2 = hammer_bread(hmp, layer2_off, &error, &buffer2);
 406                         if (error)
 407                                 goto end;
 408
 409                         error = callback(trans, volume, &buffer2, NULL,
 410                                          layer2, phys_off, block_off, data);
 411                         if (error)
 412                                 goto end;
 413                 }
 414
 415                 layer1_off = freemap->phys_offset +
 416                                 HAMMER_BLOCKMAP_LAYER1_OFFSET(phys_off);
 417                 layer1 = hammer_bread(hmp, layer1_off, &error, &buffer1);
 418                 if (error)
 419                         goto end;
 420
 421                 error = callback(trans, volume, &buffer1, layer1, NULL,
 422                                  phys_off, 0, data);
 423                 if (error)
 424                         goto end;
 425         }
 426
 427 end:
 428         if (buffer1)
 429                 hammer_rel_buffer(buffer1, 0);
 430         if (buffer2)
 431                 hammer_rel_buffer(buffer2, 0);
 432
 433         return error;
 434 }
 435
 436
 437 static int
 438 format_callback(hammer_transaction_t trans, hammer_volume_t volume,
 439         hammer_buffer_t *bufferp,
 440         struct hammer_blockmap_layer1 *layer1,
 441         struct hammer_blockmap_layer2 *layer2,
 442         hammer_off_t phys_off,
 443         hammer_off_t block_off,
 444         void *data)
 445 {
 446         struct bigblock_stat *stat = (struct bigblock_stat*)data;
 447
 448         /*
 449          * Calculate the usable size of the volume, which must be aligned
 450          * at a big-block (8 MB) boundary.
 451          */
 452         hammer_off_t aligned_buf_end_off;
 453         aligned_buf_end_off = HAMMER_ENCODE_RAW_BUFFER(volume->ondisk->vol_no,
 454                 (volume->ondisk->vol_buf_end - volume->ondisk->vol_buf_beg)
 455                 & ~HAMMER_BIGBLOCK_MASK64);
 456
 457         if (layer1) {
 458                 KKASSERT(layer1->phys_offset == HAMMER_BLOCKMAP_UNAVAIL);
 459
 460                 hammer_modify_buffer(trans, *bufferp, layer1, sizeof(*layer1));
 461                 bzero(layer1, sizeof(*layer1));
 462                 layer1->phys_offset = phys_off;
 463                 layer1->blocks_free = stat->counter;
 464                 layer1->layer1_crc = crc32(layer1, HAMMER_LAYER1_CRCSIZE);
 465                 hammer_modify_buffer_done(*bufferp);
 466                 stat->counter = 0; /* reset */
 467         } else if (layer2) {
 468                 hammer_modify_buffer(trans, *bufferp, layer2, sizeof(*layer2));
 469                 bzero(layer2, sizeof(*layer2));
 470
 471                 if (block_off == 0) {
 472                         /*
 473                          * The first entry represents the L2 big-block itself.
 474                          * Note that the first entry represents the L1 big-block
 475                          * and the second entry represents the L2 big-block for
 476                          * root volume, but this function assumes the volume is
 477                          * non-root given that we can't add a new root volume.
 478                          */
 479                         KKASSERT(trans->rootvol && trans->rootvol != volume);
 480                         layer2->zone = HAMMER_ZONE_FREEMAP_INDEX;
 481                         layer2->append_off = HAMMER_BIGBLOCK_SIZE;
 482                         layer2->bytes_free = 0;
 483                 } else if (phys_off + block_off < aligned_buf_end_off) {
 484                         /*
 485                          * Available big-block
 486                          */
 487                         layer2->zone = 0;
 488                         layer2->append_off = 0;
 489                         layer2->bytes_free = HAMMER_BIGBLOCK_SIZE;
 490                         ++stat->total_bigblocks;
 491                         ++stat->total_free_bigblocks;
 492                         ++stat->counter;
 493                 } else {
 494                         /*
 495                          * Big-block outside of physically available
 496                          * space
 497                          */
 498                         layer2->zone = HAMMER_ZONE_UNAVAIL_INDEX;
 499                         layer2->append_off = HAMMER_BIGBLOCK_SIZE;
 500                         layer2->bytes_free = 0;
 501                 }
 502
 503                 layer2->entry_crc = crc32(layer2, HAMMER_LAYER2_CRCSIZE);
 504                 hammer_modify_buffer_done(*bufferp);
 505         } else {
 506                 KKASSERT(0);
 507         }
 508
 509         return 0;
 510 }
 511
 512 static int
 513 hammer_format_freemap(hammer_transaction_t trans, hammer_volume_t volume,
 514         struct bigblock_stat *stat)
 515 {
 516         stat->total_bigblocks = 0;
 517         stat->total_free_bigblocks = 0;
 518         stat->counter = 0;
 519         return hammer_iterate_l1l2_entries(trans, volume, format_callback, stat);
 520 }
 521
 522 static int
 523 free_callback(hammer_transaction_t trans, hammer_volume_t volume __unused,
 524         hammer_buffer_t *bufferp,
 525         struct hammer_blockmap_layer1 *layer1,
 526         struct hammer_blockmap_layer2 *layer2,
 527         hammer_off_t phys_off,
 528         hammer_off_t block_off __unused,
 529         void *data)
 530 {
 531         struct bigblock_stat *stat = (struct bigblock_stat*)data;
 532
 533         if (layer1) {
 534                 if (layer1->phys_offset == HAMMER_BLOCKMAP_UNAVAIL) {
 535                         /*
 536                          * This layer1 entry is already free.
 537                          */
 538                         return 0;
 539                 }
 540
 541                 KKASSERT(HAMMER_VOL_DECODE(layer1->phys_offset) ==
 542                         trans->hmp->volume_to_remove);
 543
 544                 /*
 545                  * Free the L1 entry
 546                  */
 547                 hammer_modify_buffer(trans, *bufferp, layer1, sizeof(*layer1));
 548                 bzero(layer1, sizeof(*layer1));
 549                 layer1->phys_offset = HAMMER_BLOCKMAP_UNAVAIL;
 550                 layer1->layer1_crc = crc32(layer1, HAMMER_LAYER1_CRCSIZE);
 551                 hammer_modify_buffer_done(*bufferp);
 552
 553                 return 0;
 554         } else if (layer2) {
 555                 if (layer2->zone == HAMMER_ZONE_UNAVAIL_INDEX) {
 556                         return 0;
 557                 }
 558
 559                 if (layer2->zone == HAMMER_ZONE_FREEMAP_INDEX) {
 560                         return 0;
 561                 }
 562
 563                 if (layer2->append_off == 0 &&
 564                     layer2->bytes_free == HAMMER_BIGBLOCK_SIZE) {
 565                         --stat->total_bigblocks;
 566                         --stat->total_free_bigblocks;
 567                         return 0;
 568                 }
 569
 570                 /*
 571                  * We found a layer2 entry that is not empty!
 572                  */
 573                 return EBUSY;
 574         } else {
 575                 KKASSERT(0);
 576         }
 577
 578         return EINVAL;
 579 }
 580
 581 /*
 582  * Non-zero return value means we can't free the volume.
 583  */
 584 static int
 585 test_free_callback(hammer_transaction_t trans, hammer_volume_t volume __unused,
 586         hammer_buffer_t *bufferp,
 587         struct hammer_blockmap_layer1 *layer1,
 588         struct hammer_blockmap_layer2 *layer2,
 589         hammer_off_t phys_off,
 590         hammer_off_t block_off __unused,
 591         void *data)
 592 {
 593         if (layer2 == NULL) {
 594                 return(0);  /* only layer2 needs to be tested */
 595         }
 596
 597         if (layer2->zone == HAMMER_ZONE_UNAVAIL_INDEX) {
 598                 return(0);  /* beyond physically available space */
 599         }
 600         if (layer2->zone == HAMMER_ZONE_FREEMAP_INDEX) {
 601                 return(0);  /* big-block for layer1/2 */
 602         }
 603         if (layer2->append_off == 0 &&
 604             layer2->bytes_free == HAMMER_BIGBLOCK_SIZE) {
 605                 return(0);  /* big-block is 0% used */
 606         }
 607
 608         return(EBUSY);  /* big-block has data */
 609 }
 610
 611 static int
 612 hammer_free_freemap(hammer_transaction_t trans, hammer_volume_t volume,
 613         struct bigblock_stat *stat)
 614 {
 615         int error;
 616
 617         error = hammer_test_free_freemap(trans, volume);
 618         if (error)
 619                 return error;  /* not ready to free */
 620
 621         stat->total_bigblocks = 0;
 622         stat->total_free_bigblocks = 0;
 623         stat->counter = 0;
 624         return hammer_iterate_l1l2_entries(trans, volume, free_callback, stat);
 625 }
 626
 627 static int
 628 hammer_test_free_freemap(hammer_transaction_t trans, hammer_volume_t volume)
 629 {
 630         return hammer_iterate_l1l2_entries(trans, volume, test_free_callback, NULL);
 631 }
 632
 633 static int
 634 hammer_format_volume_header(struct hammer_mount *hmp,
 635         struct hammer_volume_ondisk *ondisk,
 636         const char *vol_name, int vol_no, int vol_count,
 637         int64_t vol_size, int64_t boot_area_size, int64_t mem_area_size)
 638 {
 639         int64_t vol_alloc;
 640
 641         KKASSERT(HAMMER_BUFSIZE >= sizeof(struct hammer_volume_ondisk));
 642
 643         bzero(ondisk, sizeof(struct hammer_volume_ondisk));
 644         ksnprintf(ondisk->vol_name, sizeof(ondisk->vol_name), "%s", vol_name);
 645         ondisk->vol_fstype = hmp->rootvol->ondisk->vol_fstype;
 646         ondisk->vol_signature = HAMMER_FSBUF_VOLUME;
 647         ondisk->vol_fsid = hmp->fsid;
 648         ondisk->vol_rootvol = hmp->rootvol->vol_no;
 649         ondisk->vol_no = vol_no;
 650         ondisk->vol_count = vol_count;
 651         ondisk->vol_version = hmp->version;
 652
 653         /*
 654          * Reserve space for (future) header junk, copy volume relative
 655          * offset from the existing root volume.
 656          */
 657         vol_alloc = hmp->rootvol->ondisk->vol_bot_beg;
 658         ondisk->vol_bot_beg = vol_alloc;
 659         vol_alloc += boot_area_size;
 660         ondisk->vol_mem_beg = vol_alloc;
 661         vol_alloc += mem_area_size;
 662
 663         /*
 664          * The remaining area is the zone 2 buffer allocation area.
 665          */
 666         ondisk->vol_buf_beg = vol_alloc;
 667         ondisk->vol_buf_end = vol_size & ~(int64_t)HAMMER_BUFMASK;
 668
 669         if (ondisk->vol_buf_end < ondisk->vol_buf_beg) {
 670                 hmkprintf(hmp, "volume %d %s is too small to hold the volume header\n",
 671                      ondisk->vol_no, ondisk->vol_name);
 672                 return(EFTYPE);
 673         }
 674
 675         ondisk->vol_nblocks = (ondisk->vol_buf_end - ondisk->vol_buf_beg) /
 676                               HAMMER_BUFSIZE;
 677         ondisk->vol_blocksize = HAMMER_BUFSIZE;
 678         return(0);
 679 }
 680
 681 static int
 682 hammer_update_volumes_header(hammer_transaction_t trans,
 683         struct bigblock_stat *stat)
 684 {
 685         struct hammer_mount *hmp = trans->hmp;
 686         struct mount *mp = hmp->mp;
 687         hammer_volume_t volume;
 688         int vol_no;
 689         int error = 0;
 690
 691         /*
 692          * Set each volume's new value of the vol_count field.
 693          */
 694         HAMMER_VOLUME_NUMBER_FOREACH(hmp, vol_no) {
 695                 volume = hammer_get_volume(hmp, vol_no, &error);
 696                 KKASSERT(volume != NULL && error == 0);
 697                 hammer_modify_volume_field(trans, volume, vol_count);
 698                 volume->ondisk->vol_count = hmp->nvolumes;
 699                 hammer_modify_volume_done(volume);
 700
 701                 /*
 702                  * Only changes to the header of the root volume
 703                  * are automatically flushed to disk. For all
 704                  * other volumes that we modify we do it here.
 705                  *
 706                  * No interlock is needed, volume buffers are not
 707                  * messed with by bioops.
 708                  */
 709                 if (volume != trans->rootvol && volume->io.modified) {
 710                         hammer_crc_set_volume(volume->ondisk);
 711                         hammer_io_flush(&volume->io, 0);
 712                 }
 713
 714                 hammer_rel_volume(volume, 0);
 715         }
 716
 717         /*
 718          * Update the total number of big-blocks.
 719          */
 720         hammer_modify_volume_field(trans, trans->rootvol, vol0_stat_bigblocks);
 721         trans->rootvol->ondisk->vol0_stat_bigblocks += stat->total_bigblocks;
 722         hammer_modify_volume_done(trans->rootvol);
 723
 724         /*
 725          * Big-block count changed so recompute the total number of blocks.
 726          */
 727         mp->mnt_stat.f_blocks = trans->rootvol->ondisk->vol0_stat_bigblocks *
 728                                 HAMMER_BUFFERS_PER_BIGBLOCK;
 729         mp->mnt_vstat.f_blocks = trans->rootvol->ondisk->vol0_stat_bigblocks *
 730                                 HAMMER_BUFFERS_PER_BIGBLOCK;
 731
 732         /*
 733          * Update the total number of free big-blocks.
 734          */
 735         hammer_modify_volume_field(trans, trans->rootvol,
 736                 vol0_stat_freebigblocks);
 737         trans->rootvol->ondisk->vol0_stat_freebigblocks +=
 738                 stat->total_free_bigblocks;
 739         hammer_modify_volume_done(trans->rootvol);
 740
 741         /*
 742          * Update the copy in hmp.
 743          */
 744         hmp->copy_stat_freebigblocks =
 745                 trans->rootvol->ondisk->vol0_stat_freebigblocks;
 746
 747         return(error);
 748 }