sbin/hammer/ondisk.c

   1 /*
   2  * Copyright (c) 2007 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>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/diskslice.h>
  36 #include <sys/diskmbr.h>
  37
  38 #include "hammer_util.h"
  39
  40 static void check_volume(struct volume_info *vol);
  41 static void get_buffer_readahead(struct buffer_info *base);
  42 static __inline int readhammervol(struct volume_info *vol);
  43 static __inline int readhammerbuf(struct buffer_info *buf);
  44 static __inline int writehammervol(struct volume_info *vol);
  45 static __inline int writehammerbuf(struct buffer_info *buf);
  46
  47 uuid_t Hammer_FSType;
  48 uuid_t Hammer_FSId;
  49 int UseReadBehind = -4;
  50 int UseReadAhead = 4;
  51 int DebugOpt;
  52
  53 TAILQ_HEAD(volume_list, volume_info);
  54 static struct volume_list VolList = TAILQ_HEAD_INITIALIZER(VolList);
  55 static int valid_hammer_volumes;
  56
  57 static __inline
  58 int
  59 buffer_hash(hammer_off_t zone2_offset)
  60 {
  61         int hi;
  62
  63         hi = (int)(zone2_offset / HAMMER_BUFSIZE) & HAMMER_BUFLISTMASK;
  64         return(hi);
  65 }
  66
  67 static struct buffer_info*
  68 find_buffer(hammer_off_t zone2_offset)
  69 {
  70         struct volume_info *volume;
  71         struct buffer_info *buf;
  72         int hi;
  73
  74         volume = get_volume(HAMMER_VOL_DECODE(zone2_offset));
  75         assert(volume);
  76
  77         hi = buffer_hash(zone2_offset);
  78         TAILQ_FOREACH(buf, &volume->buffer_lists[hi], entry)
  79                 if (buf->zone2_offset == zone2_offset)
  80                         return(buf);
  81         return(NULL);
  82 }
  83
  84 static
  85 struct volume_info *
  86 __alloc_volume(const char *volname, int oflags)
  87 {
  88         struct volume_info *vol;
  89         int i;
  90
  91         vol = calloc(1, sizeof(*vol));
  92         vol->vol_no = -1;
  93         vol->rdonly = (oflags == O_RDONLY);
  94         vol->name = strdup(volname);
  95         vol->fd = open(vol->name, oflags);
  96         if (vol->fd < 0)
  97                 err(1, "alloc_volume: Failed to open %s", vol->name);
  98         check_volume(vol);
  99
 100         vol->ondisk = calloc(1, HAMMER_BUFSIZE);
 101
 102         for (i = 0; i < HAMMER_BUFLISTS; ++i)
 103                 TAILQ_INIT(&vol->buffer_lists[i]);
 104
 105         return(vol);
 106 }
 107
 108 static void
 109 __add_volume(struct volume_info *vol)
 110 {
 111         struct volume_info *scan;
 112         struct stat st1, st2;
 113
 114         if (fstat(vol->fd, &st1) != 0)
 115                 errx(1, "add_volume: %s: Failed to stat", vol->name);
 116
 117         TAILQ_FOREACH(scan, &VolList, entry) {
 118                 if (scan->vol_no == vol->vol_no) {
 119                         errx(1, "add_volume: %s: Duplicate volume number %d "
 120                                 "against %s",
 121                                 vol->name, vol->vol_no, scan->name);
 122                 }
 123                 if (fstat(scan->fd, &st2) != 0) {
 124                         errx(1, "add_volume: %s: Failed to stat %s",
 125                                 vol->name, scan->name);
 126                 }
 127                 if ((st1.st_ino == st2.st_ino) && (st1.st_dev == st2.st_dev)) {
 128                         errx(1, "add_volume: %s: Specified more than once",
 129                                 vol->name);
 130                 }
 131         }
 132
 133         TAILQ_INSERT_TAIL(&VolList, vol, entry);
 134 }
 135
 136 static void
 137 __verify_volume(struct volume_info *vol)
 138 {
 139         hammer_volume_ondisk_t ondisk = vol->ondisk;
 140
 141         if (ondisk->vol_signature != HAMMER_FSBUF_VOLUME) {
 142                 errx(1, "verify_volume: Invalid volume signature %016jx",
 143                         ondisk->vol_signature);
 144         }
 145         if (ondisk->vol_rootvol != HAMMER_ROOT_VOLNO) {
 146                 errx(1, "verify_volume: Invalid root volume# %d",
 147                         ondisk->vol_rootvol);
 148         }
 149         if (bcmp(&Hammer_FSType, &ondisk->vol_fstype, sizeof(Hammer_FSType))) {
 150                 errx(1, "verify_volume: %s: Header does not indicate "
 151                         "that this is a HAMMER volume", vol->name);
 152         }
 153         if (bcmp(&Hammer_FSId, &ondisk->vol_fsid, sizeof(Hammer_FSId))) {
 154                 errx(1, "verify_volume: %s: FSId does not match other volumes!",
 155                         vol->name);
 156         }
 157 }
 158
 159 /*
 160  * Initialize a volume structure and ondisk vol_no field.
 161  */
 162 struct volume_info *
 163 init_volume(const char *filename, int oflags, int32_t vol_no)
 164 {
 165         struct volume_info *vol;
 166
 167         vol = __alloc_volume(filename, oflags);
 168         vol->vol_no = vol->ondisk->vol_no = vol_no;
 169
 170         __add_volume(vol);
 171
 172         return(vol);
 173 }
 174
 175 /*
 176  * Initialize a volume structure and read ondisk volume header.
 177  */
 178 struct volume_info*
 179 load_volume(const char *filename, int oflags, int verify)
 180 {
 181         struct volume_info *vol;
 182         int n;
 183
 184         vol = __alloc_volume(filename, oflags);
 185
 186         n = readhammervol(vol);
 187         if (n == -1) {
 188                 err(1, "load_volume: %s: Read failed at offset 0", vol->name);
 189         }
 190         vol->vol_no = vol->ondisk->vol_no;
 191
 192         if (valid_hammer_volumes++ == 0)
 193                 Hammer_FSId = vol->ondisk->vol_fsid;
 194         if (verify)
 195                 __verify_volume(vol);
 196
 197         __add_volume(vol);
 198
 199         return(vol);
 200 }
 201
 202 /*
 203  * Check basic volume characteristics.
 204  */
 205 static void
 206 check_volume(struct volume_info *vol)
 207 {
 208         struct partinfo pinfo;
 209         struct stat st;
 210
 211         /*
 212          * Get basic information about the volume
 213          */
 214         if (ioctl(vol->fd, DIOCGPART, &pinfo) < 0) {
 215                 /*
 216                  * Allow the formatting of regular files as HAMMER volumes
 217                  */
 218                 if (fstat(vol->fd, &st) < 0)
 219                         err(1, "Unable to stat %s", vol->name);
 220                 vol->size = st.st_size;
 221                 vol->type = "REGFILE";
 222         } else {
 223                 /*
 224                  * When formatting a block device as a HAMMER volume the
 225                  * sector size must be compatible.  HAMMER uses 16384 byte
 226                  * filesystem buffers.
 227                  */
 228                 if (pinfo.reserved_blocks) {
 229                         errx(1, "HAMMER cannot be placed in a partition "
 230                                 "which overlaps the disklabel or MBR");
 231                 }
 232                 if (pinfo.media_blksize > HAMMER_BUFSIZE ||
 233                     HAMMER_BUFSIZE % pinfo.media_blksize) {
 234                         errx(1, "A media sector size of %d is not supported",
 235                              pinfo.media_blksize);
 236                 }
 237
 238                 vol->size = pinfo.media_size;
 239                 vol->device_offset = pinfo.media_offset;
 240                 vol->type = "DEVICE";
 241         }
 242 }
 243
 244 void
 245 assert_volume_offset(struct volume_info *vol)
 246 {
 247         assert(hammer_is_zone_raw_buffer(vol->vol_free_off));
 248         assert(hammer_is_zone_raw_buffer(vol->vol_free_end));
 249         if (vol->vol_free_off >= vol->vol_free_end)
 250                 errx(1, "Ran out of room, filesystem too small");
 251 }
 252
 253 struct volume_info *
 254 get_volume(int32_t vol_no)
 255 {
 256         struct volume_info *vol;
 257
 258         TAILQ_FOREACH(vol, &VolList, entry) {
 259                 if (vol->vol_no == vol_no)
 260                         break;
 261         }
 262
 263         return(vol);
 264 }
 265
 266 struct volume_info *
 267 get_root_volume(void)
 268 {
 269         return(get_volume(HAMMER_ROOT_VOLNO));
 270 }
 271
 272 static hammer_off_t
 273 __blockmap_xlate_to_zone2(hammer_off_t buf_offset)
 274 {
 275         hammer_off_t zone2_offset;
 276         int error = 0;
 277
 278         if (hammer_is_zone_raw_buffer(buf_offset))
 279                 zone2_offset = buf_offset;
 280         else
 281                 zone2_offset = blockmap_lookup(buf_offset, &error);
 282
 283         if (error)
 284                 return(HAMMER_OFF_BAD);
 285         assert(hammer_is_zone_raw_buffer(zone2_offset));
 286
 287         return(zone2_offset);
 288 }
 289
 290 static struct buffer_info *
 291 __alloc_buffer(hammer_off_t zone2_offset, int isnew)
 292 {
 293         struct volume_info *volume;
 294         struct buffer_info *buf;
 295         int hi;
 296
 297         volume = get_volume(HAMMER_VOL_DECODE(zone2_offset));
 298         assert(volume != NULL);
 299
 300         buf = calloc(1, sizeof(*buf));
 301         buf->zone2_offset = zone2_offset;
 302         buf->raw_offset = hammer_xlate_to_phys(volume->ondisk, zone2_offset);
 303         buf->volume = volume;
 304         buf->ondisk = calloc(1, HAMMER_BUFSIZE);
 305
 306         if (isnew <= 0) {
 307                 if (readhammerbuf(buf) == -1) {
 308                         err(1, "Failed to read %s:%016jx at %016jx",
 309                             volume->name,
 310                             (intmax_t)buf->zone2_offset,
 311                             (intmax_t)buf->raw_offset);
 312                 }
 313         }
 314
 315         hi = buffer_hash(zone2_offset);
 316         TAILQ_INSERT_TAIL(&volume->buffer_lists[hi], buf, entry);
 317         hammer_cache_add(&buf->cache);
 318
 319         return(buf);
 320 }
 321
 322 /*
 323  * Acquire the 16KB buffer for specified zone offset.
 324  */
 325 static struct buffer_info *
 326 get_buffer(hammer_off_t buf_offset, int isnew)
 327 {
 328         struct buffer_info *buf;
 329         hammer_off_t zone2_offset;
 330         int dora = 0;
 331
 332         zone2_offset = __blockmap_xlate_to_zone2(buf_offset);
 333         if (zone2_offset == HAMMER_OFF_BAD)
 334                 return(NULL);
 335
 336         zone2_offset &= ~HAMMER_BUFMASK64;
 337         buf = find_buffer(zone2_offset);
 338
 339         if (buf == NULL) {
 340                 buf = __alloc_buffer(zone2_offset, isnew);
 341                 dora = (isnew == 0);
 342         } else {
 343                 assert(isnew != -1);
 344                 hammer_cache_used(&buf->cache);
 345         }
 346         assert(buf->ondisk != NULL);
 347
 348         ++buf->cache.refs;
 349         hammer_cache_flush();
 350
 351         if (isnew > 0) {
 352                 assert(buf->cache.modified == 0);
 353                 bzero(buf->ondisk, HAMMER_BUFSIZE);
 354                 buf->cache.modified = 1;
 355         }
 356         if (dora)
 357                 get_buffer_readahead(buf);
 358         return(buf);
 359 }
 360
 361 static void
 362 get_buffer_readahead(struct buffer_info *base)
 363 {
 364         struct buffer_info *buf;
 365         struct volume_info *vol;
 366         hammer_off_t zone2_offset;
 367         int64_t raw_offset;
 368         int ri = UseReadBehind;
 369         int re = UseReadAhead;
 370
 371         raw_offset = base->raw_offset + ri * HAMMER_BUFSIZE;
 372         vol = base->volume;
 373
 374         while (ri < re) {
 375                 if (raw_offset >= vol->ondisk->vol_buf_end)
 376                         break;
 377                 if (raw_offset < vol->ondisk->vol_buf_beg || ri == 0) {
 378                         ++ri;
 379                         raw_offset += HAMMER_BUFSIZE;
 380                         continue;
 381                 }
 382                 zone2_offset = HAMMER_ENCODE_RAW_BUFFER(vol->vol_no,
 383                         raw_offset - vol->ondisk->vol_buf_beg);
 384                 buf = find_buffer(zone2_offset);
 385                 if (buf == NULL) {
 386                         /* call with -1 to prevent another readahead */
 387                         buf = get_buffer(zone2_offset, -1);
 388                         rel_buffer(buf);
 389                 }
 390                 ++ri;
 391                 raw_offset += HAMMER_BUFSIZE;
 392         }
 393 }
 394
 395 void
 396 rel_buffer(struct buffer_info *buffer)
 397 {
 398         struct volume_info *volume;
 399         int hi;
 400
 401         if (buffer == NULL)
 402                 return;
 403         assert(buffer->cache.refs > 0);
 404         if (--buffer->cache.refs == 0) {
 405                 if (buffer->cache.delete) {
 406                         hi = buffer_hash(buffer->zone2_offset);
 407                         volume = buffer->volume;
 408                         if (buffer->cache.modified)
 409                                 flush_buffer(buffer);
 410                         TAILQ_REMOVE(&volume->buffer_lists[hi], buffer, entry);
 411                         hammer_cache_del(&buffer->cache);
 412                         free(buffer->ondisk);
 413                         free(buffer);
 414                 }
 415         }
 416 }
 417
 418 /*
 419  * Retrieve a pointer to a buffer data given a buffer offset.  The underlying
 420  * bufferp is freed if isnew or the offset is out of range of the cached data.
 421  * If bufferp is freed a referenced buffer is loaded into it.
 422  */
 423 void *
 424 get_buffer_data(hammer_off_t buf_offset, struct buffer_info **bufferp,
 425                 int isnew)
 426 {
 427         hammer_off_t xor;
 428
 429         if (*bufferp != NULL) {
 430                 if (hammer_is_zone_direct_xlated(buf_offset)) {
 431                         xor = HAMMER_OFF_LONG_ENCODE(buf_offset) ^
 432                               HAMMER_OFF_LONG_ENCODE((*bufferp)->zone2_offset);
 433                         if (isnew > 0 || (xor & ~HAMMER_BUFMASK64)) {
 434                                 rel_buffer(*bufferp);
 435                                 *bufferp = NULL;
 436                         }
 437                 }
 438         }
 439
 440         if (*bufferp == NULL) {
 441                 *bufferp = get_buffer(buf_offset, isnew);
 442                 if (*bufferp == NULL)
 443                         return(NULL);
 444         }
 445
 446         return(((char *)(*bufferp)->ondisk) +
 447                 ((int32_t)buf_offset & HAMMER_BUFMASK));
 448 }
 449
 450 /*
 451  * Allocate HAMMER elements - B-Tree nodes
 452  */
 453 hammer_node_ondisk_t
 454 alloc_btree_node(hammer_off_t *offp, struct buffer_info **data_bufferp)
 455 {
 456         hammer_node_ondisk_t node;
 457
 458         node = alloc_blockmap(HAMMER_ZONE_BTREE_INDEX, sizeof(*node),
 459                               offp, data_bufferp);
 460         bzero(node, sizeof(*node));
 461         return(node);
 462 }
 463
 464 /*
 465  * Allocate HAMMER elements - meta data (inode, direntry, PFS, etc)
 466  */
 467 void *
 468 alloc_meta_element(hammer_off_t *offp, int32_t data_len,
 469                    struct buffer_info **data_bufferp)
 470 {
 471         void *data;
 472
 473         data = alloc_blockmap(HAMMER_ZONE_META_INDEX, data_len,
 474                               offp, data_bufferp);
 475         bzero(data, data_len);
 476         return(data);
 477 }
 478
 479 /*
 480  * Format a new blockmap.  This is mostly a degenerate case because
 481  * all allocations are now actually done from the freemap.
 482  */
 483 void
 484 format_blockmap(struct volume_info *root_vol, int zone, hammer_off_t offset)
 485 {
 486         hammer_blockmap_t blockmap;
 487         hammer_off_t zone_base;
 488
 489         /* Only root volume needs formatting */
 490         assert(root_vol->vol_no == HAMMER_ROOT_VOLNO);
 491
 492         assert(hammer_is_index_record(zone));
 493
 494         blockmap = &root_vol->ondisk->vol0_blockmap[zone];
 495         zone_base = HAMMER_ZONE_ENCODE(zone, offset);
 496
 497         bzero(blockmap, sizeof(*blockmap));
 498         blockmap->phys_offset = 0;
 499         blockmap->first_offset = zone_base;
 500         blockmap->next_offset = zone_base;
 501         blockmap->alloc_offset = HAMMER_ENCODE(zone, 255, -1);
 502         hammer_crc_set_blockmap(blockmap);
 503 }
 504
 505 /*
 506  * Format a new freemap.  Set all layer1 entries to UNAVAIL.  The initialize
 507  * code will load each volume's freemap.
 508  */
 509 void
 510 format_freemap(struct volume_info *root_vol)
 511 {
 512         struct buffer_info *buffer = NULL;
 513         hammer_off_t layer1_offset;
 514         hammer_blockmap_t blockmap;
 515         hammer_blockmap_layer1_t layer1;
 516         int i, isnew;
 517
 518         /* Only root volume needs formatting */
 519         assert(root_vol->vol_no == HAMMER_ROOT_VOLNO);
 520
 521         layer1_offset = bootstrap_bigblock(root_vol);
 522         for (i = 0; i < HAMMER_BIGBLOCK_SIZE; i += sizeof(*layer1)) {
 523                 isnew = ((i % HAMMER_BUFSIZE) == 0);
 524                 layer1 = get_buffer_data(layer1_offset + i, &buffer, isnew);
 525                 bzero(layer1, sizeof(*layer1));
 526                 layer1->phys_offset = HAMMER_BLOCKMAP_UNAVAIL;
 527                 layer1->blocks_free = 0;
 528                 hammer_crc_set_layer1(layer1);
 529         }
 530         assert(i == HAMMER_BIGBLOCK_SIZE);
 531         rel_buffer(buffer);
 532
 533         blockmap = &root_vol->ondisk->vol0_blockmap[HAMMER_ZONE_FREEMAP_INDEX];
 534         bzero(blockmap, sizeof(*blockmap));
 535         blockmap->phys_offset = layer1_offset;
 536         blockmap->first_offset = 0;
 537         blockmap->next_offset = HAMMER_ENCODE_RAW_BUFFER(0, 0);
 538         blockmap->alloc_offset = HAMMER_ENCODE_RAW_BUFFER(255, -1);
 539         hammer_crc_set_blockmap(blockmap);
 540 }
 541
 542 /*
 543  * Load the volume's remaining free space into the freemap.
 544  *
 545  * Returns the number of big-blocks available.
 546  */
 547 int64_t
 548 initialize_freemap(struct volume_info *vol)
 549 {
 550         struct volume_info *root_vol;
 551         struct buffer_info *buffer1 = NULL;
 552         struct buffer_info *buffer2 = NULL;
 553         hammer_blockmap_layer1_t layer1;
 554         hammer_blockmap_layer2_t layer2;
 555         hammer_off_t layer1_offset;
 556         hammer_off_t layer2_offset;
 557         hammer_off_t phys_offset;
 558         hammer_off_t block_offset;
 559         hammer_off_t aligned_vol_free_end;
 560         hammer_blockmap_t freemap;
 561         int64_t count = 0;
 562         int64_t layer1_count = 0;
 563
 564         root_vol = get_root_volume();
 565
 566         assert_volume_offset(vol);
 567         aligned_vol_free_end = HAMMER_BLOCKMAP_LAYER2_DOALIGN(vol->vol_free_end);
 568
 569         printf("initialize freemap volume %d\n", vol->vol_no);
 570
 571         /*
 572          * Initialize the freemap.  First preallocate the big-blocks required
 573          * to implement layer2.   This preallocation is a bootstrap allocation
 574          * using blocks from the target volume.
 575          */
 576         freemap = &root_vol->ondisk->vol0_blockmap[HAMMER_ZONE_FREEMAP_INDEX];
 577
 578         for (phys_offset = HAMMER_ENCODE_RAW_BUFFER(vol->vol_no, 0);
 579              phys_offset < aligned_vol_free_end;
 580              phys_offset += HAMMER_BLOCKMAP_LAYER2) {
 581                 layer1_offset = freemap->phys_offset +
 582                                 HAMMER_BLOCKMAP_LAYER1_OFFSET(phys_offset);
 583                 layer1 = get_buffer_data(layer1_offset, &buffer1, 0);
 584                 if (layer1->phys_offset == HAMMER_BLOCKMAP_UNAVAIL) {
 585                         layer1->phys_offset = bootstrap_bigblock(vol);
 586                         layer1->blocks_free = 0;
 587                         buffer1->cache.modified = 1;
 588                         hammer_crc_set_layer1(layer1);
 589                 }
 590         }
 591
 592         /*
 593          * Now fill everything in.
 594          */
 595         for (phys_offset = HAMMER_ENCODE_RAW_BUFFER(vol->vol_no, 0);
 596              phys_offset < aligned_vol_free_end;
 597              phys_offset += HAMMER_BLOCKMAP_LAYER2) {
 598                 layer1_count = 0;
 599                 layer1_offset = freemap->phys_offset +
 600                                 HAMMER_BLOCKMAP_LAYER1_OFFSET(phys_offset);
 601                 layer1 = get_buffer_data(layer1_offset, &buffer1, 0);
 602                 assert(layer1->phys_offset != HAMMER_BLOCKMAP_UNAVAIL);
 603
 604                 for (block_offset = 0;
 605                      block_offset < HAMMER_BLOCKMAP_LAYER2;
 606                      block_offset += HAMMER_BIGBLOCK_SIZE) {
 607                         layer2_offset = layer1->phys_offset +
 608                                         HAMMER_BLOCKMAP_LAYER2_OFFSET(block_offset);
 609                         layer2 = get_buffer_data(layer2_offset, &buffer2, 0);
 610                         bzero(layer2, sizeof(*layer2));
 611
 612                         if (phys_offset + block_offset < vol->vol_free_off) {
 613                                 /*
 614                                  * Big-blocks already allocated as part
 615                                  * of the freemap bootstrap.
 616                                  */
 617                                 layer2->zone = HAMMER_ZONE_FREEMAP_INDEX;
 618                                 layer2->append_off = HAMMER_BIGBLOCK_SIZE;
 619                                 layer2->bytes_free = 0;
 620                         } else if (phys_offset + block_offset < vol->vol_free_end) {
 621                                 layer2->zone = 0;
 622                                 layer2->append_off = 0;
 623                                 layer2->bytes_free = HAMMER_BIGBLOCK_SIZE;
 624                                 ++count;
 625                                 ++layer1_count;
 626                         } else {
 627                                 layer2->zone = HAMMER_ZONE_UNAVAIL_INDEX;
 628                                 layer2->append_off = HAMMER_BIGBLOCK_SIZE;
 629                                 layer2->bytes_free = 0;
 630                         }
 631                         hammer_crc_set_layer2(layer2);
 632                         buffer2->cache.modified = 1;
 633                 }
 634
 635                 layer1->blocks_free += layer1_count;
 636                 hammer_crc_set_layer1(layer1);
 637                 buffer1->cache.modified = 1;
 638         }
 639
 640         rel_buffer(buffer1);
 641         rel_buffer(buffer2);
 642         return(count);
 643 }
 644
 645 /*
 646  * Returns the number of big-blocks available for filesystem data and undos
 647  * without formatting.
 648  */
 649 int64_t
 650 count_freemap(struct volume_info *vol)
 651 {
 652         hammer_off_t phys_offset;
 653         hammer_off_t vol_free_off;
 654         hammer_off_t aligned_vol_free_end;
 655         int64_t count = 0;
 656
 657         vol_free_off = HAMMER_ENCODE_RAW_BUFFER(vol->vol_no, 0);
 658
 659         assert_volume_offset(vol);
 660         aligned_vol_free_end = HAMMER_BLOCKMAP_LAYER2_DOALIGN(vol->vol_free_end);
 661
 662         if (vol->vol_no == HAMMER_ROOT_VOLNO)
 663                 vol_free_off += HAMMER_BIGBLOCK_SIZE;
 664
 665         for (phys_offset = HAMMER_ENCODE_RAW_BUFFER(vol->vol_no, 0);
 666              phys_offset < aligned_vol_free_end;
 667              phys_offset += HAMMER_BLOCKMAP_LAYER2) {
 668                 vol_free_off += HAMMER_BIGBLOCK_SIZE;
 669         }
 670
 671         for (phys_offset = HAMMER_ENCODE_RAW_BUFFER(vol->vol_no, 0);
 672              phys_offset < aligned_vol_free_end;
 673              phys_offset += HAMMER_BIGBLOCK_SIZE) {
 674                 if (phys_offset < vol_free_off) {
 675                         ;
 676                 } else if (phys_offset < vol->vol_free_end) {
 677                         ++count;
 678                 }
 679         }
 680
 681         return(count);
 682 }
 683
 684 /*
 685  * Format the undomap for the root volume.
 686  */
 687 void
 688 format_undomap(struct volume_info *root_vol, int64_t *undo_buffer_size)
 689 {
 690         hammer_off_t undo_limit;
 691         hammer_blockmap_t blockmap;
 692         hammer_volume_ondisk_t ondisk;
 693         struct buffer_info *buffer = NULL;
 694         hammer_off_t scan;
 695         int n;
 696         int limit_index;
 697         uint32_t seqno;
 698
 699         /* Only root volume needs formatting */
 700         assert(root_vol->vol_no == HAMMER_ROOT_VOLNO);
 701         ondisk = root_vol->ondisk;
 702
 703         /*
 704          * Size the undo buffer in multiples of HAMMER_BIGBLOCK_SIZE,
 705          * up to HAMMER_MAX_UNDO_BIGBLOCKS big-blocks.
 706          * Size to approximately 0.1% of the disk.
 707          *
 708          * The minimum UNDO fifo size is 512MB, or approximately 1% of
 709          * the recommended 50G disk.
 710          *
 711          * Changing this minimum is rather dangerous as complex filesystem
 712          * operations can cause the UNDO FIFO to fill up otherwise.
 713          */
 714         undo_limit = *undo_buffer_size;
 715         if (undo_limit == 0) {
 716                 undo_limit = HAMMER_VOL_BUF_SIZE(ondisk) / 1000;
 717                 if (undo_limit < HAMMER_BIGBLOCK_SIZE * HAMMER_MIN_UNDO_BIGBLOCKS)
 718                         undo_limit = HAMMER_BIGBLOCK_SIZE * HAMMER_MIN_UNDO_BIGBLOCKS;
 719         }
 720         undo_limit = HAMMER_BIGBLOCK_DOALIGN(undo_limit);
 721         if (undo_limit < HAMMER_BIGBLOCK_SIZE)
 722                 undo_limit = HAMMER_BIGBLOCK_SIZE;
 723         if (undo_limit > HAMMER_BIGBLOCK_SIZE * HAMMER_MAX_UNDO_BIGBLOCKS)
 724                 undo_limit = HAMMER_BIGBLOCK_SIZE * HAMMER_MAX_UNDO_BIGBLOCKS;
 725         *undo_buffer_size = undo_limit;
 726
 727         blockmap = &ondisk->vol0_blockmap[HAMMER_ZONE_UNDO_INDEX];
 728         bzero(blockmap, sizeof(*blockmap));
 729         blockmap->phys_offset = HAMMER_BLOCKMAP_UNAVAIL;
 730         blockmap->first_offset = HAMMER_ENCODE_UNDO(0);
 731         blockmap->next_offset = blockmap->first_offset;
 732         blockmap->alloc_offset = HAMMER_ENCODE_UNDO(undo_limit);
 733         hammer_crc_set_blockmap(blockmap);
 734
 735         limit_index = undo_limit / HAMMER_BIGBLOCK_SIZE;
 736         assert(limit_index <= HAMMER_MAX_UNDO_BIGBLOCKS);
 737
 738         for (n = 0; n < limit_index; ++n) {
 739                 ondisk->vol0_undo_array[n] = alloc_undo_bigblock(root_vol);
 740         }
 741         while (n < HAMMER_MAX_UNDO_BIGBLOCKS) {
 742                 ondisk->vol0_undo_array[n++] = HAMMER_BLOCKMAP_UNAVAIL;
 743         }
 744
 745         /*
 746          * Pre-initialize the UNDO blocks (HAMMER version 4+)
 747          */
 748         printf("initializing the undo map (%jd MB)\n",
 749                 (intmax_t)HAMMER_OFF_LONG_ENCODE(blockmap->alloc_offset) /
 750                 (1024 * 1024));
 751
 752         scan = blockmap->first_offset;
 753         seqno = 0;
 754
 755         while (scan < blockmap->alloc_offset) {
 756                 hammer_fifo_head_t head;
 757                 hammer_fifo_tail_t tail;
 758                 int isnew;
 759                 int bytes = HAMMER_UNDO_ALIGN;
 760
 761                 isnew = ((scan & HAMMER_BUFMASK64) == 0);
 762                 head = get_buffer_data(scan, &buffer, isnew);
 763                 buffer->cache.modified = 1;
 764                 tail = (void *)((char *)head + bytes - sizeof(*tail));
 765
 766                 bzero(head, bytes);
 767                 head->hdr_signature = HAMMER_HEAD_SIGNATURE;
 768                 head->hdr_type = HAMMER_HEAD_TYPE_DUMMY;
 769                 head->hdr_size = bytes;
 770                 head->hdr_seq = seqno++;
 771
 772                 tail->tail_signature = HAMMER_TAIL_SIGNATURE;
 773                 tail->tail_type = HAMMER_HEAD_TYPE_DUMMY;
 774                 tail->tail_size = bytes;
 775
 776                 hammer_crc_set_fifo_head(head, bytes);
 777
 778                 scan += bytes;
 779         }
 780         rel_buffer(buffer);
 781 }
 782
 783 const char *zone_labels[] = {
 784         "",             /* 0 */
 785         "raw_volume",   /* 1 */
 786         "raw_buffer",   /* 2 */
 787         "undo",         /* 3 */
 788         "freemap",      /* 4 */
 789         "",             /* 5 */
 790         "",             /* 6 */
 791         "",             /* 7 */
 792         "btree",        /* 8 */
 793         "meta",         /* 9 */
 794         "large_data",   /* 10 */
 795         "small_data",   /* 11 */
 796         "",             /* 12 */
 797         "",             /* 13 */
 798         "",             /* 14 */
 799         "unavail",      /* 15 */
 800 };
 801
 802 void
 803 print_blockmap(const struct volume_info *vol)
 804 {
 805         hammer_blockmap_t blockmap;
 806         hammer_volume_ondisk_t ondisk;
 807         int64_t size, used;
 808         int i;
 809 #define INDENT ""
 810
 811         ondisk = vol->ondisk;
 812         printf(INDENT"vol_label\t%s\n", ondisk->vol_label);
 813         printf(INDENT"vol_count\t%d\n", ondisk->vol_count);
 814         printf(INDENT"vol_bot_beg\t%s\n", sizetostr(ondisk->vol_bot_beg));
 815         printf(INDENT"vol_mem_beg\t%s\n", sizetostr(ondisk->vol_mem_beg));
 816         printf(INDENT"vol_buf_beg\t%s\n", sizetostr(ondisk->vol_buf_beg));
 817         printf(INDENT"vol_buf_end\t%s\n", sizetostr(ondisk->vol_buf_end));
 818         printf(INDENT"vol0_next_tid\t%016jx\n",
 819                (uintmax_t)ondisk->vol0_next_tid);
 820
 821         blockmap = &ondisk->vol0_blockmap[HAMMER_ZONE_UNDO_INDEX];
 822         size = HAMMER_OFF_LONG_ENCODE(blockmap->alloc_offset);
 823         if (blockmap->first_offset <= blockmap->next_offset)
 824                 used = blockmap->next_offset - blockmap->first_offset;
 825         else
 826                 used = blockmap->alloc_offset - blockmap->first_offset +
 827                         HAMMER_OFF_LONG_ENCODE(blockmap->next_offset);
 828         printf(INDENT"undo_size\t%s\n", sizetostr(size));
 829         printf(INDENT"undo_used\t%s\n", sizetostr(used));
 830
 831         printf(INDENT"zone #             "
 832                "phys             first            next             alloc\n");
 833         for (i = 0; i < HAMMER_MAX_ZONES; i++) {
 834                 blockmap = &ondisk->vol0_blockmap[i];
 835                 printf(INDENT"zone %-2d %-10s %016jx %016jx %016jx %016jx\n",
 836                         i, zone_labels[i],
 837                         (uintmax_t)blockmap->phys_offset,
 838                         (uintmax_t)blockmap->first_offset,
 839                         (uintmax_t)blockmap->next_offset,
 840                         (uintmax_t)blockmap->alloc_offset);
 841         }
 842 }
 843
 844 /*
 845  * Flush various tracking structures to disk
 846  */
 847 void
 848 flush_all_volumes(void)
 849 {
 850         struct volume_info *vol;
 851
 852         TAILQ_FOREACH(vol, &VolList, entry)
 853                 flush_volume(vol);
 854 }
 855
 856 void
 857 flush_volume(struct volume_info *volume)
 858 {
 859         struct buffer_info *buffer;
 860         int i;
 861
 862         for (i = 0; i < HAMMER_BUFLISTS; ++i) {
 863                 TAILQ_FOREACH(buffer, &volume->buffer_lists[i], entry)
 864                         flush_buffer(buffer);
 865         }
 866         if (writehammervol(volume) == -1)
 867                 err(1, "Write volume %d (%s)", volume->vol_no, volume->name);
 868 }
 869
 870 void
 871 flush_buffer(struct buffer_info *buffer)
 872 {
 873         struct volume_info *vol;
 874
 875         vol = buffer->volume;
 876         if (writehammerbuf(buffer) == -1)
 877                 err(1, "Write volume %d (%s)", vol->vol_no, vol->name);
 878         buffer->cache.modified = 0;
 879 }
 880
 881 /*
 882  * Core I/O operations
 883  */
 884 static int
 885 __read(struct volume_info *vol, void *data, int64_t offset, int size)
 886 {
 887         ssize_t n;
 888
 889         n = pread(vol->fd, data, size, offset);
 890         if (n != size)
 891                 return(-1);
 892         return(0);
 893 }
 894
 895 static __inline int
 896 readhammervol(struct volume_info *vol)
 897 {
 898         return(__read(vol, vol->ondisk, 0, HAMMER_BUFSIZE));
 899 }
 900
 901 static __inline int
 902 readhammerbuf(struct buffer_info *buf)
 903 {
 904         return(__read(buf->volume, buf->ondisk, buf->raw_offset, HAMMER_BUFSIZE));
 905 }
 906
 907 static int
 908 __write(struct volume_info *vol, const void *data, int64_t offset, int size)
 909 {
 910         ssize_t n;
 911
 912         if (vol->rdonly)
 913                 return(0);
 914
 915         n = pwrite(vol->fd, data, size, offset);
 916         if (n != size)
 917                 return(-1);
 918         return(0);
 919 }
 920
 921 static __inline int
 922 writehammervol(struct volume_info *vol)
 923 {
 924         return(__write(vol, vol->ondisk, 0, HAMMER_BUFSIZE));
 925 }
 926
 927 static __inline int
 928 writehammerbuf(struct buffer_info *buf)
 929 {
 930         return(__write(buf->volume, buf->ondisk, buf->raw_offset, HAMMER_BUFSIZE));
 931 }
 932
 933 int64_t init_boot_area_size(int64_t value, off_t avg_vol_size)
 934 {
 935         if (value == 0) {
 936                 value = HAMMER_BOOT_NOMBYTES;
 937                 while (value > avg_vol_size / HAMMER_MAX_VOLUMES)
 938                         value >>= 1;
 939         }
 940
 941         if (value < HAMMER_BOOT_MINBYTES) {
 942                 value = HAMMER_BOOT_MINBYTES;
 943         } else if (value > HAMMER_BOOT_MAXBYTES) {
 944                 value = HAMMER_BOOT_MAXBYTES;
 945         }
 946
 947         return(value);
 948 }
 949
 950 int64_t init_memory_log_size(int64_t value, off_t avg_vol_size)
 951 {
 952         if (value == 0) {
 953                 value = HAMMER_MEM_NOMBYTES;
 954                 while (value > avg_vol_size / HAMMER_MAX_VOLUMES)
 955                         value >>= 1;
 956         }
 957
 958         if (value < HAMMER_MEM_MINBYTES) {
 959                 value = HAMMER_MEM_MINBYTES;
 960         } else if (value > HAMMER_MEM_MAXBYTES) {
 961                 value = HAMMER_MEM_MAXBYTES;
 962         }
 963
 964         return(value);
 965 }