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 <sys/fcntl.h>
  38 #include <sys/nlookup.h>
  39
  40 #include "hammer.h"
  41
  42 struct bigblock_stat {
  43         int64_t total_bigblocks;
  44         int64_t total_free_bigblocks;
  45         int64_t counter;
  46 };
  47
  48 static int
  49 hammer_format_volume_header(struct hammer_mount *hmp,
  50         struct hammer_volume_ondisk *ondisk,
  51         const char *vol_name, int vol_no, int vol_count,
  52         int64_t vol_size, int64_t boot_area_size, int64_t mem_area_size);
  53
  54 static int
  55 hammer_update_volumes_header(hammer_transaction_t trans,
  56         struct bigblock_stat *stat);
  57
  58 static int
  59 hammer_do_reblock(hammer_transaction_t trans, hammer_inode_t ip);
  60
  61 static int
  62 hammer_format_freemap(hammer_transaction_t trans, hammer_volume_t volume,
  63         struct bigblock_stat *stat);
  64
  65 static int
  66 hammer_free_freemap(hammer_transaction_t trans, hammer_volume_t volume,
  67         struct bigblock_stat *stat);
  68
  69 static int
  70 hammer_test_free_freemap(hammer_transaction_t trans, hammer_volume_t volume);
  71
  72 int
  73 hammer_ioc_volume_add(hammer_transaction_t trans, hammer_inode_t ip,
  74                 struct hammer_ioc_volume *ioc)
  75 {
  76         struct hammer_mount *hmp = trans->hmp;
  77         struct mount *mp = hmp->mp;
  78         struct hammer_volume_ondisk ondisk;
  79         struct bigblock_stat stat;
  80         hammer_volume_t volume;
  81         int free_vol_no = 0;
  82         int error;
  83
  84         if (mp->mnt_flag & MNT_RDONLY) {
  85                 kprintf("Cannot add volume to read-only HAMMER filesystem\n");
  86                 return (EINVAL);
  87         }
  88
  89         if (hmp->nvolumes >= HAMMER_MAX_VOLUMES) {
  90                 kprintf("Max number of HAMMER volumes exceeded\n");
  91                 return (EINVAL);
  92         }
  93
  94         if (hammer_lock_ex_try(&hmp->volume_lock) != 0) {
  95                 kprintf("Another volume operation is in progress!\n");
  96                 return (EAGAIN);
  97         }
  98
  99         /*
 100          * Find an unused volume number.
 101          */
 102         while (free_vol_no < HAMMER_MAX_VOLUMES &&
 103                 HAMMER_VOLUME_NUMBER_IS_SET(hmp, free_vol_no)) {
 104                 ++free_vol_no;
 105         }
 106         if (free_vol_no >= HAMMER_MAX_VOLUMES) {
 107                 kprintf("Max number of HAMMER volumes exceeded\n");
 108                 error = EINVAL;
 109                 goto end;
 110         }
 111
 112         error = hammer_format_volume_header(
 113                 hmp,
 114                 &ondisk,
 115                 hmp->rootvol->ondisk->vol_name,
 116                 free_vol_no,
 117                 hmp->nvolumes+1,
 118                 ioc->vol_size,
 119                 ioc->boot_area_size,
 120                 ioc->mem_area_size);
 121         if (error)
 122                 goto end;
 123
 124         error = hammer_install_volume(hmp, ioc->device_name, NULL, &ondisk);
 125         if (error)
 126                 goto end;
 127
 128         hammer_sync_lock_sh(trans);
 129         hammer_lock_ex(&hmp->blkmap_lock);
 130
 131         volume = hammer_get_volume(hmp, free_vol_no, &error);
 132         KKASSERT(volume != NULL && error == 0);
 133
 134         error = hammer_format_freemap(trans, volume, &stat);
 135         KKASSERT(error == 0);
 136         hammer_rel_volume(volume, 0);
 137
 138         ++hmp->nvolumes;
 139         error = hammer_update_volumes_header(trans, &stat);
 140         KKASSERT(error == 0);
 141
 142         hammer_unlock(&hmp->blkmap_lock);
 143         hammer_sync_unlock(trans);
 144
 145         KKASSERT(error == 0);
 146 end:
 147         hammer_unlock(&hmp->volume_lock);
 148         if (error)
 149                 kprintf("An error occurred: %d\n", error);
 150         return (error);
 151 }
 152
 153
 154 /*
 155  * Remove a volume.
 156  */
 157 int
 158 hammer_ioc_volume_del(hammer_transaction_t trans, hammer_inode_t ip,
 159                 struct hammer_ioc_volume *ioc)
 160 {
 161         struct hammer_mount *hmp = trans->hmp;
 162         struct mount *mp = hmp->mp;
 163         struct hammer_volume_ondisk *ondisk;
 164         struct bigblock_stat stat;
 165         hammer_volume_t volume;
 166         int vol_no;
 167         int error = 0;
 168
 169         if (mp->mnt_flag & MNT_RDONLY) {
 170                 kprintf("Cannot del volume from read-only HAMMER filesystem\n");
 171                 return (EINVAL);
 172         }
 173
 174         if (hammer_lock_ex_try(&hmp->volume_lock) != 0) {
 175                 kprintf("Another volume operation is in progress!\n");
 176                 return (EAGAIN);
 177         }
 178
 179         /*
 180          * find volume by volname
 181          */
 182         volume = NULL;
 183         HAMMER_VOLUME_NUMBER_FOREACH(hmp, vol_no) {
 184                 volume = hammer_get_volume(hmp, vol_no, &error);
 185                 KKASSERT(volume != NULL && error == 0);
 186                 if (strcmp(volume->vol_name, ioc->device_name) == 0) {
 187                         break;
 188                 }
 189                 hammer_rel_volume(volume, 0);
 190                 volume = NULL;
 191         }
 192
 193         if (volume == NULL) {
 194                 kprintf("Couldn't find volume\n");
 195                 error = EINVAL;
 196                 goto end;
 197         }
 198
 199         if (volume == trans->rootvol) {
 200                 kprintf("Cannot remove root-volume\n");
 201                 hammer_rel_volume(volume, 0);
 202                 error = EINVAL;
 203                 goto end;
 204         }
 205
 206         /*
 207          * Reblock filesystem if the volume is not empty
 208          */
 209         hmp->volume_to_remove = volume->vol_no;
 210
 211         if (hammer_test_free_freemap(trans, volume)) {
 212                 error = hammer_do_reblock(trans, ip);
 213                 if (error) {
 214                         hmp->volume_to_remove = -1;
 215                         hammer_rel_volume(volume, 0);
 216                         goto end;
 217                 }
 218         }
 219
 220         /*
 221          * Sync filesystem
 222          */
 223         hammer_flush_dirty(hmp, 30);
 224
 225         hammer_sync_lock_sh(trans);
 226         hammer_lock_ex(&hmp->blkmap_lock);
 227
 228         /*
 229          * We use stat later to update rootvol's big-block stats
 230          */
 231         error = hammer_free_freemap(trans, volume, &stat);
 232         if (error) {
 233                 kprintf("Failed to free volume: ");
 234                 if (error == EBUSY)
 235                         kprintf("Volume %d not empty\n", volume->vol_no);
 236                 else
 237                         kprintf("%d\n", error);
 238                 hmp->volume_to_remove = -1;
 239                 hammer_rel_volume(volume, 0);
 240                 goto end1;
 241         }
 242
 243         hmp->volume_to_remove = -1;
 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                 kprintf("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
 263 end1:
 264         hammer_unlock(&hmp->blkmap_lock);
 265         hammer_sync_unlock(trans);
 266
 267 end:
 268         hammer_unlock(&hmp->volume_lock);
 269         if (error)
 270                 kprintf("An error occurred: %d\n", error);
 271         return (error);
 272 }
 273
 274
 275 int
 276 hammer_ioc_volume_list(hammer_transaction_t trans, hammer_inode_t ip,
 277     struct hammer_ioc_volume_list *ioc)
 278 {
 279         struct hammer_mount *hmp = trans->hmp;
 280         hammer_volume_t volume;
 281         int error = 0;
 282         int i, len, cnt = 0;
 283
 284         if (hammer_lock_ex_try(&hmp->volume_lock) != 0) {
 285                 kprintf("Another volume operation is in progress!\n");
 286                 return (EAGAIN);
 287         }
 288
 289         HAMMER_VOLUME_NUMBER_FOREACH(hmp, i) {
 290                 if (cnt >= ioc->nvols)
 291                         break;
 292                 volume = hammer_get_volume(hmp, i, &error);
 293                 KKASSERT(volume != NULL && error == 0);
 294
 295                 len = strlen(volume->vol_name) + 1;
 296                 KKASSERT(len <= MAXPATHLEN);
 297
 298                 error = copyout(volume->vol_name, ioc->vols[cnt].device_name,
 299                                 len);
 300                 hammer_rel_volume(volume, 0);
 301                 if (error)
 302                         goto end;
 303                 cnt++;
 304         }
 305         ioc->nvols = cnt;
 306
 307 end:
 308         hammer_unlock(&hmp->volume_lock);
 309         return (error);
 310 }
 311
 312 static
 313 int
 314 hammer_do_reblock(hammer_transaction_t trans, hammer_inode_t ip)
 315 {
 316         int error;
 317
 318         struct hammer_ioc_reblock reblock;
 319         bzero(&reblock, sizeof(reblock));
 320
 321         reblock.key_beg.localization = HAMMER_MIN_LOCALIZATION;
 322         reblock.key_beg.obj_id = HAMMER_MIN_OBJID;
 323         reblock.key_end.localization = HAMMER_MAX_LOCALIZATION;
 324         reblock.key_end.obj_id = HAMMER_MAX_OBJID;
 325         reblock.head.flags = HAMMER_IOC_DO_FLAGS;
 326         reblock.free_level = 0;
 327         reblock.allpfs = 1;
 328
 329         kprintf("reblock started\n");
 330         error = hammer_ioc_reblock(trans, ip, &reblock);
 331
 332         if (reblock.head.flags & HAMMER_IOC_HEAD_INTR) {
 333                 error = EINTR;
 334         }
 335
 336         if (error) {
 337                 if (error == EINTR) {
 338                         kprintf("reblock was interrupted\n");
 339                 } else {
 340                         kprintf("reblock failed: %d\n", error);
 341                 }
 342                 return(error);
 343         }
 344
 345         return(0);
 346 }
 347
 348 /*
 349  * Iterate over all usable L1 entries of the volume and
 350  * the corresponding L2 entries.
 351  */
 352 static int
 353 hammer_iterate_l1l2_entries(hammer_transaction_t trans, hammer_volume_t volume,
 354         int (*callback)(hammer_transaction_t, hammer_volume_t, hammer_buffer_t*,
 355                 struct hammer_blockmap_layer1*, struct hammer_blockmap_layer2*,
 356                 hammer_off_t, hammer_off_t, void*),
 357         void *data)
 358 {
 359         struct hammer_mount *hmp = trans->hmp;
 360         hammer_blockmap_t freemap = &hmp->blockmap[HAMMER_ZONE_FREEMAP_INDEX];
 361         int error = 0;
 362         hammer_off_t phys_off;
 363         hammer_off_t block_off;
 364         hammer_off_t layer1_off;
 365         hammer_off_t layer2_off;
 366         hammer_off_t aligned_buf_end_off;
 367         hammer_off_t aligned_vol_end_off;
 368         struct hammer_blockmap_layer1 *layer1;
 369         struct hammer_blockmap_layer2 *layer2;
 370         hammer_buffer_t buffer1 = NULL;
 371         hammer_buffer_t buffer2 = NULL;
 372
 373         /*
 374          * Calculate the usable size of the volume, which
 375          * must be aligned at a big-block (8 MB) boundary.
 376          */
 377         aligned_buf_end_off = HAMMER_ENCODE_RAW_BUFFER(volume->ondisk->vol_no,
 378                 (volume->ondisk->vol_buf_end - volume->ondisk->vol_buf_beg)
 379                 & ~HAMMER_BIGBLOCK_MASK64);
 380         aligned_vol_end_off = (aligned_buf_end_off + HAMMER_BLOCKMAP_LAYER2_MASK)
 381                 & ~HAMMER_BLOCKMAP_LAYER2_MASK;
 382
 383         /*
 384          * Iterate the volume's address space in chunks of 4 TB, where each
 385          * chunk consists of at least one physically available 8 MB big-block.
 386          *
 387          * For each chunk we need one L1 entry and one L2 big-block.
 388          * We use the first big-block of each chunk as L2 block.
 389          */
 390         for (phys_off = HAMMER_ENCODE_RAW_BUFFER(volume->ondisk->vol_no, 0);
 391              phys_off < aligned_vol_end_off;
 392              phys_off += HAMMER_BLOCKMAP_LAYER2) {
 393                 for (block_off = 0;
 394                      block_off < HAMMER_BLOCKMAP_LAYER2;
 395                      block_off += HAMMER_BIGBLOCK_SIZE) {
 396                         layer2_off = phys_off +
 397                                 HAMMER_BLOCKMAP_LAYER2_OFFSET(block_off);
 398                         layer2 = hammer_bread(hmp, layer2_off, &error, &buffer2);
 399                         if (error)
 400                                 goto end;
 401
 402                         error = callback(trans, volume, &buffer2, NULL,
 403                                          layer2, phys_off, block_off, data);
 404                         if (error)
 405                                 goto end;
 406                 }
 407
 408                 layer1_off = freemap->phys_offset +
 409                                 HAMMER_BLOCKMAP_LAYER1_OFFSET(phys_off);
 410                 layer1 = hammer_bread(hmp, layer1_off, &error, &buffer1);
 411                 if (error)
 412                         goto end;
 413
 414                 error = callback(trans, volume, &buffer1, layer1, NULL,
 415                                  phys_off, 0, data);
 416                 if (error)
 417                         goto end;
 418         }
 419
 420 end:
 421         if (buffer1)
 422                 hammer_rel_buffer(buffer1, 0);
 423         if (buffer2)
 424                 hammer_rel_buffer(buffer2, 0);
 425
 426         return error;
 427 }
 428
 429
 430 static int
 431 format_callback(hammer_transaction_t trans, hammer_volume_t volume,
 432         hammer_buffer_t *bufferp,
 433         struct hammer_blockmap_layer1 *layer1,
 434         struct hammer_blockmap_layer2 *layer2,
 435         hammer_off_t phys_off,
 436         hammer_off_t block_off,
 437         void *data)
 438 {
 439         struct bigblock_stat *stat = (struct bigblock_stat*)data;
 440
 441         /*
 442          * Calculate the usable size of the volume, which must be aligned
 443          * at a big-block (8 MB) boundary.
 444          */
 445         hammer_off_t aligned_buf_end_off;
 446         aligned_buf_end_off = HAMMER_ENCODE_RAW_BUFFER(volume->ondisk->vol_no,
 447                 (volume->ondisk->vol_buf_end - volume->ondisk->vol_buf_beg)
 448                 & ~HAMMER_BIGBLOCK_MASK64);
 449
 450         if (layer1) {
 451                 KKASSERT(layer1->phys_offset == HAMMER_BLOCKMAP_UNAVAIL);
 452
 453                 hammer_modify_buffer(trans, *bufferp, layer1, sizeof(*layer1));
 454                 bzero(layer1, sizeof(*layer1));
 455                 layer1->phys_offset = phys_off;
 456                 layer1->blocks_free = stat->counter;
 457                 layer1->layer1_crc = crc32(layer1, HAMMER_LAYER1_CRCSIZE);
 458                 hammer_modify_buffer_done(*bufferp);
 459                 stat->counter = 0; /* reset */
 460         } else if (layer2) {
 461                 hammer_modify_buffer(trans, *bufferp, layer2, sizeof(*layer2));
 462                 bzero(layer2, sizeof(*layer2));
 463
 464                 if (block_off == 0) {
 465                         /*
 466                          * The first entry represents the L2 big-block itself.
 467                          * Note that the first entry represents the L1 big-block
 468                          * and the second entry represents the L2 big-block for
 469                          * root volume, but this function assumes the volume is
 470                          * non-root given that we can't add a new root volume.
 471                          */
 472                         KKASSERT(trans->rootvol && trans->rootvol != volume);
 473                         layer2->zone = HAMMER_ZONE_FREEMAP_INDEX;
 474                         layer2->append_off = HAMMER_BIGBLOCK_SIZE;
 475                         layer2->bytes_free = 0;
 476                 } else if (phys_off + block_off < aligned_buf_end_off) {
 477                         /*
 478                          * Available big-block
 479                          */
 480                         layer2->zone = 0;
 481                         layer2->append_off = 0;
 482                         layer2->bytes_free = HAMMER_BIGBLOCK_SIZE;
 483                         ++stat->total_bigblocks;
 484                         ++stat->total_free_bigblocks;
 485                         ++stat->counter;
 486                 } else {
 487                         /*
 488                          * Big-block outside of physically available
 489                          * space
 490                          */
 491                         layer2->zone = HAMMER_ZONE_UNAVAIL_INDEX;
 492                         layer2->append_off = HAMMER_BIGBLOCK_SIZE;
 493                         layer2->bytes_free = 0;
 494                 }
 495
 496                 layer2->entry_crc = crc32(layer2, HAMMER_LAYER2_CRCSIZE);
 497                 hammer_modify_buffer_done(*bufferp);
 498         } else {
 499                 KKASSERT(0);
 500         }
 501
 502         return 0;
 503 }
 504
 505 static int
 506 hammer_format_freemap(hammer_transaction_t trans, hammer_volume_t volume,
 507         struct bigblock_stat *stat)
 508 {
 509         stat->total_bigblocks = 0;
 510         stat->total_free_bigblocks = 0;
 511         stat->counter = 0;
 512         return hammer_iterate_l1l2_entries(trans, volume, format_callback, stat);
 513 }
 514
 515 static int
 516 free_callback(hammer_transaction_t trans, hammer_volume_t volume __unused,
 517         hammer_buffer_t *bufferp,
 518         struct hammer_blockmap_layer1 *layer1,
 519         struct hammer_blockmap_layer2 *layer2,
 520         hammer_off_t phys_off,
 521         hammer_off_t block_off __unused,
 522         void *data)
 523 {
 524         struct bigblock_stat *stat = (struct bigblock_stat*)data;
 525
 526         if (layer1) {
 527                 if (layer1->phys_offset == HAMMER_BLOCKMAP_UNAVAIL) {
 528                         /*
 529                          * This layer1 entry is already free.
 530                          */
 531                         return 0;
 532                 }
 533
 534                 KKASSERT((int)HAMMER_VOL_DECODE(layer1->phys_offset) ==
 535                         trans->hmp->volume_to_remove);
 536
 537                 /*
 538                  * Free the L1 entry
 539                  */
 540                 hammer_modify_buffer(trans, *bufferp, layer1, sizeof(*layer1));
 541                 bzero(layer1, sizeof(*layer1));
 542                 layer1->phys_offset = HAMMER_BLOCKMAP_UNAVAIL;
 543                 layer1->layer1_crc = crc32(layer1, HAMMER_LAYER1_CRCSIZE);
 544                 hammer_modify_buffer_done(*bufferp);
 545
 546                 return 0;
 547         } else if (layer2) {
 548                 if (layer2->zone == HAMMER_ZONE_UNAVAIL_INDEX) {
 549                         return 0;
 550                 }
 551
 552                 if (layer2->zone == HAMMER_ZONE_FREEMAP_INDEX) {
 553                         return 0;
 554                 }
 555
 556                 if (layer2->append_off == 0 &&
 557                     layer2->bytes_free == HAMMER_BIGBLOCK_SIZE) {
 558                         --stat->total_bigblocks;
 559                         --stat->total_free_bigblocks;
 560                         return 0;
 561                 }
 562
 563                 /*
 564                  * We found a layer2 entry that is not empty!
 565                  */
 566                 return EBUSY;
 567         } else {
 568                 KKASSERT(0);
 569         }
 570
 571         return EINVAL;
 572 }
 573
 574 /*
 575  * Non-zero return value means we can't free the volume.
 576  */
 577 static int
 578 test_free_callback(hammer_transaction_t trans, hammer_volume_t volume __unused,
 579         hammer_buffer_t *bufferp,
 580         struct hammer_blockmap_layer1 *layer1,
 581         struct hammer_blockmap_layer2 *layer2,
 582         hammer_off_t phys_off,
 583         hammer_off_t block_off __unused,
 584         void *data)
 585 {
 586         if (layer2 == NULL) {
 587                 return(0);  /* only layer2 needs to be tested */
 588         }
 589
 590         if (layer2->zone == HAMMER_ZONE_UNAVAIL_INDEX) {
 591                 return(0);  /* beyond physically available space */
 592         }
 593         if (layer2->zone == HAMMER_ZONE_FREEMAP_INDEX) {
 594                 return(0);  /* big-block for layer1/2 */
 595         }
 596         if (layer2->append_off == 0 &&
 597             layer2->bytes_free == HAMMER_BIGBLOCK_SIZE) {
 598                 return(0);  /* big-block is 0% used */
 599         }
 600
 601         return(EBUSY);  /* big-block has data */
 602 }
 603
 604 static int
 605 hammer_free_freemap(hammer_transaction_t trans, hammer_volume_t volume,
 606         struct bigblock_stat *stat)
 607 {
 608         int error;
 609
 610         error = hammer_test_free_freemap(trans, volume);
 611         if (error)
 612                 return error;  /* not ready to free */
 613
 614         stat->total_bigblocks = 0;
 615         stat->total_free_bigblocks = 0;
 616         stat->counter = 0;
 617         return hammer_iterate_l1l2_entries(trans, volume, free_callback, stat);
 618 }
 619
 620 static int
 621 hammer_test_free_freemap(hammer_transaction_t trans, hammer_volume_t volume)
 622 {
 623         return hammer_iterate_l1l2_entries(trans, volume, test_free_callback, NULL);
 624 }
 625
 626 static int
 627 hammer_format_volume_header(struct hammer_mount *hmp,
 628         struct hammer_volume_ondisk *ondisk,
 629         const char *vol_name, int vol_no, int vol_count,
 630         int64_t vol_size, int64_t boot_area_size, int64_t mem_area_size)
 631 {
 632         int64_t vol_alloc;
 633
 634         KKASSERT(HAMMER_BUFSIZE >= sizeof(struct hammer_volume_ondisk));
 635
 636         bzero(ondisk, sizeof(struct hammer_volume_ondisk));
 637         ksnprintf(ondisk->vol_name, sizeof(ondisk->vol_name), "%s", vol_name);
 638         ondisk->vol_fstype = hmp->rootvol->ondisk->vol_fstype;
 639         ondisk->vol_signature = HAMMER_FSBUF_VOLUME;
 640         ondisk->vol_fsid = hmp->fsid;
 641         ondisk->vol_rootvol = hmp->rootvol->vol_no;
 642         ondisk->vol_no = vol_no;
 643         ondisk->vol_count = vol_count;
 644         ondisk->vol_version = hmp->version;
 645
 646         /*
 647          * Reserve space for (future) header junk, setup our poor-man's
 648          * big-block allocator.
 649          */
 650         vol_alloc = HAMMER_BUFSIZE * 16;
 651         ondisk->vol_bot_beg = vol_alloc;
 652         vol_alloc += boot_area_size;
 653         ondisk->vol_mem_beg = vol_alloc;
 654         vol_alloc += mem_area_size;
 655
 656         /*
 657          * The remaining area is the zone 2 buffer allocation area.  These
 658          * buffers
 659          */
 660         ondisk->vol_buf_beg = vol_alloc;
 661         ondisk->vol_buf_end = vol_size & ~(int64_t)HAMMER_BUFMASK;
 662
 663         if (ondisk->vol_buf_end < ondisk->vol_buf_beg) {
 664                 kprintf("volume %d %s is too small to hold the volume header\n",
 665                      ondisk->vol_no, ondisk->vol_name);
 666                 return(EFTYPE);
 667         }
 668
 669         ondisk->vol_nblocks = (ondisk->vol_buf_end - ondisk->vol_buf_beg) /
 670                               HAMMER_BUFSIZE;
 671         ondisk->vol_blocksize = HAMMER_BUFSIZE;
 672         return(0);
 673 }
 674
 675 static int
 676 hammer_update_volumes_header(hammer_transaction_t trans,
 677         struct bigblock_stat *stat)
 678 {
 679         struct hammer_mount *hmp = trans->hmp;
 680         struct mount *mp = hmp->mp;
 681         hammer_volume_t volume;
 682         int vol_no;
 683         int error = 0;
 684
 685         /*
 686          * Set each volume's new value of the vol_count field.
 687          */
 688         HAMMER_VOLUME_NUMBER_FOREACH(hmp, vol_no) {
 689                 volume = hammer_get_volume(hmp, vol_no, &error);
 690                 KKASSERT(volume != NULL && error == 0);
 691                 hammer_modify_volume_field(trans, volume, vol_count);
 692                 volume->ondisk->vol_count = hmp->nvolumes;
 693                 hammer_modify_volume_done(volume);
 694
 695                 /*
 696                  * Only changes to the header of the root volume
 697                  * are automatically flushed to disk. For all
 698                  * other volumes that we modify we do it here.
 699                  *
 700                  * No interlock is needed, volume buffers are not
 701                  * messed with by bioops.
 702                  */
 703                 if (volume != trans->rootvol && volume->io.modified) {
 704                         hammer_crc_set_volume(volume->ondisk);
 705                         hammer_io_flush(&volume->io, 0);
 706                 }
 707
 708                 hammer_rel_volume(volume, 0);
 709         }
 710
 711         /*
 712          * Update the total number of big-blocks.
 713          */
 714         hammer_modify_volume_field(trans, trans->rootvol, vol0_stat_bigblocks);
 715         trans->rootvol->ondisk->vol0_stat_bigblocks += stat->total_bigblocks;
 716         hammer_modify_volume_done(trans->rootvol);
 717
 718         /*
 719          * Big-block count changed so recompute the total number of blocks.
 720          */
 721         mp->mnt_stat.f_blocks = trans->rootvol->ondisk->vol0_stat_bigblocks *
 722                                 HAMMER_BUFFERS_PER_BIGBLOCK;
 723         mp->mnt_vstat.f_blocks = trans->rootvol->ondisk->vol0_stat_bigblocks *
 724                                 HAMMER_BUFFERS_PER_BIGBLOCK;
 725
 726         /*
 727          * Update the total number of free big-blocks.
 728          */
 729         hammer_modify_volume_field(trans, trans->rootvol,
 730                 vol0_stat_freebigblocks);
 731         trans->rootvol->ondisk->vol0_stat_freebigblocks +=
 732                 stat->total_free_bigblocks;
 733         hammer_modify_volume_done(trans->rootvol);
 734
 735         /*
 736          * Update the copy in hmp.
 737          */
 738         hmp->copy_stat_freebigblocks =
 739                 trans->rootvol->ondisk->vol0_stat_freebigblocks;
 740
 741         return(error);
 742 }