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 void *get_ondisk(hammer_off_t buf_offset, struct buffer_info **bufferp,
  43                         int isnew);
  44 static __inline int readhammervol(struct volume_info *vol);
  45 static __inline int readhammerbuf(struct buffer_info *buf);
  46 static __inline int writehammervol(struct volume_info *vol);
  47 static __inline int writehammerbuf(struct buffer_info *buf);
  48
  49 uuid_t Hammer_FSType;
  50 uuid_t Hammer_FSId;
  51 int UseReadBehind = -4;
  52 int UseReadAhead = 4;
  53 int DebugOpt;
  54
  55 TAILQ_HEAD(volume_list, volume_info);
  56 static struct volume_list VolList = TAILQ_HEAD_INITIALIZER(VolList);
  57 static int valid_hammer_volumes;
  58
  59 static __inline
  60 int
  61 buffer_hash(hammer_off_t buf_offset)
  62 {
  63         int hi;
  64
  65         hi = (int)(buf_offset / HAMMER_BUFSIZE) & HAMMER_BUFLISTMASK;
  66         return(hi);
  67 }
  68
  69 static struct buffer_info*
  70 find_buffer(struct volume_info *volume, hammer_off_t buf_offset)
  71 {
  72         int hi;
  73         struct buffer_info *buf;
  74
  75         hi = buffer_hash(buf_offset);
  76         TAILQ_FOREACH(buf, &volume->buffer_lists[hi], entry)
  77                 if (buf->buf_offset == buf_offset)
  78                         return(buf);
  79         return(NULL);
  80 }
  81
  82 static
  83 struct volume_info *
  84 __alloc_volume(const char *volname, int oflags)
  85 {
  86         struct volume_info *vol;
  87         int i;
  88
  89         vol = malloc(sizeof(*vol));
  90         if (vol == NULL)
  91                 err(1, "alloc_volume");
  92         bzero(vol, sizeof(*vol));
  93
  94         vol->vol_no = -1;
  95         vol->rdonly = (oflags == O_RDONLY);
  96         vol->name = strdup(volname);
  97         vol->fd = open(vol->name, oflags);
  98         if (vol->fd < 0)
  99                 err(1, "alloc_volume: Failed to open %s", vol->name);
 100         check_volume(vol);
 101
 102         vol->ondisk = malloc(HAMMER_BUFSIZE);
 103         if (vol->ondisk == NULL)
 104                 err(1, "alloc_volume");
 105         bzero(vol->ondisk, HAMMER_BUFSIZE);
 106
 107         for (i = 0; i < HAMMER_BUFLISTS; ++i)
 108                 TAILQ_INIT(&vol->buffer_lists[i]);
 109
 110         return(vol);
 111 }
 112
 113 static void
 114 __add_volume(struct volume_info *vol)
 115 {
 116         struct volume_info *scan;
 117         struct stat st1, st2;
 118
 119         if (fstat(vol->fd, &st1) != 0)
 120                 errx(1, "add_volume: %s: Failed to stat", vol->name);
 121
 122         TAILQ_FOREACH(scan, &VolList, entry) {
 123                 if (scan->vol_no == vol->vol_no) {
 124                         errx(1, "add_volume: %s: Duplicate volume number %d "
 125                                 "against %s",
 126                                 vol->name, vol->vol_no, scan->name);
 127                 }
 128                 if (fstat(scan->fd, &st2) != 0) {
 129                         errx(1, "add_volume: %s: Failed to stat %s",
 130                                 vol->name, scan->name);
 131                 }
 132                 if ((st1.st_ino == st2.st_ino) && (st1.st_dev == st2.st_dev)) {
 133                         errx(1, "add_volume: %s: Specified more than once",
 134                                 vol->name);
 135                 }
 136         }
 137
 138         TAILQ_INSERT_TAIL(&VolList, vol, entry);
 139 }
 140
 141 /*
 142  * Initialize a volume structure and ondisk vol_no field.
 143  */
 144 struct volume_info *
 145 init_volume(int32_t vol_no, const char *filename, int oflags)
 146 {
 147         struct volume_info *vol;
 148
 149         vol = __alloc_volume(filename, oflags);
 150         vol->vol_no = vol->ondisk->vol_no = vol_no;
 151
 152         __add_volume(vol);
 153
 154         return(vol);
 155 }
 156
 157 /*
 158  * Initialize a volume structure and read ondisk volume header.
 159  */
 160 struct volume_info*
 161 load_volume(const char *filename, int oflags)
 162 {
 163         struct volume_info *vol;
 164         hammer_volume_ondisk_t ondisk;
 165         int n;
 166
 167         vol = __alloc_volume(filename, oflags);
 168
 169         n = readhammervol(vol);
 170         if (n == -1) {
 171                 err(1, "load_volume: %s: Read failed at offset 0", vol->name);
 172         }
 173         ondisk = vol->ondisk;
 174         vol->vol_no = ondisk->vol_no;
 175
 176         if (ondisk->vol_rootvol != HAMMER_ROOT_VOLNO) {
 177                 errx(1, "load_volume: Invalid root volume# %d",
 178                         ondisk->vol_rootvol);
 179         }
 180
 181         if (bcmp(&Hammer_FSType, &ondisk->vol_fstype, sizeof(Hammer_FSType))) {
 182                 errx(1, "load_volume: %s: Header does not indicate "
 183                         "that this is a hammer volume", vol->name);
 184         }
 185
 186         if (valid_hammer_volumes++ == 0) {
 187                 Hammer_FSId = ondisk->vol_fsid;
 188         } else if (bcmp(&Hammer_FSId, &ondisk->vol_fsid, sizeof(Hammer_FSId))) {
 189                 errx(1, "load_volume: %s: FSId does match other volumes!",
 190                         vol->name);
 191         }
 192
 193         __add_volume(vol);
 194
 195         return(vol);
 196 }
 197
 198 /*
 199  * Check basic volume characteristics.
 200  */
 201 static void
 202 check_volume(struct volume_info *vol)
 203 {
 204         struct partinfo pinfo;
 205         struct stat st;
 206
 207         /*
 208          * Get basic information about the volume
 209          */
 210         if (ioctl(vol->fd, DIOCGPART, &pinfo) < 0) {
 211                 /*
 212                  * Allow the formatting of regular files as HAMMER volumes
 213                  */
 214                 if (fstat(vol->fd, &st) < 0)
 215                         err(1, "Unable to stat %s", vol->name);
 216                 vol->size = st.st_size;
 217                 vol->type = "REGFILE";
 218         } else {
 219                 /*
 220                  * When formatting a block device as a HAMMER volume the
 221                  * sector size must be compatible.  HAMMER uses 16384 byte
 222                  * filesystem buffers.
 223                  */
 224                 if (pinfo.reserved_blocks) {
 225                         errx(1, "HAMMER cannot be placed in a partition "
 226                                 "which overlaps the disklabel or MBR");
 227                 }
 228                 if (pinfo.media_blksize > HAMMER_BUFSIZE ||
 229                     HAMMER_BUFSIZE % pinfo.media_blksize) {
 230                         errx(1, "A media sector size of %d is not supported",
 231                              pinfo.media_blksize);
 232                 }
 233
 234                 vol->size = pinfo.media_size;
 235                 vol->device_offset = pinfo.media_offset;
 236                 vol->type = "DEVICE";
 237         }
 238 }
 239
 240 void
 241 assert_volume_offset(struct volume_info *vol)
 242 {
 243         assert(hammer_is_zone_raw_buffer(vol->vol_free_off));
 244         assert(hammer_is_zone_raw_buffer(vol->vol_free_end));
 245 }
 246
 247 struct volume_info *
 248 get_volume(int32_t vol_no)
 249 {
 250         struct volume_info *vol;
 251
 252         TAILQ_FOREACH(vol, &VolList, entry) {
 253                 if (vol->vol_no == vol_no)
 254                         break;
 255         }
 256
 257         return(vol);
 258 }
 259
 260 struct volume_info *
 261 get_root_volume(void)
 262 {
 263         struct volume_info *root_vol;
 264
 265         root_vol = get_volume(HAMMER_ROOT_VOLNO);
 266         assert(root_vol != NULL);
 267
 268         return(root_vol);
 269 }
 270
 271 /*
 272  * Acquire the specified buffer.  isnew is -1 only when called
 273  * via get_buffer_readahead() to prevent another readahead.
 274  */
 275 static struct buffer_info *
 276 get_buffer(hammer_off_t buf_offset, int isnew)
 277 {
 278         struct buffer_info *buf;
 279         struct volume_info *volume;
 280         int vol_no;
 281         int zone;
 282         int hi;
 283         int dora = 0;
 284         int error = 0;
 285
 286         zone = HAMMER_ZONE_DECODE(buf_offset);
 287         if (zone > HAMMER_ZONE_RAW_BUFFER_INDEX)
 288                 buf_offset = blockmap_lookup(buf_offset, NULL, NULL, &error);
 289         if (error || buf_offset == HAMMER_OFF_BAD)
 290                 return(NULL);
 291         assert(hammer_is_zone_raw_buffer(buf_offset));
 292
 293         vol_no = HAMMER_VOL_DECODE(buf_offset);
 294         volume = get_volume(vol_no);
 295         assert(volume != NULL);
 296
 297         buf_offset &= ~HAMMER_BUFMASK64;
 298         buf = find_buffer(volume, buf_offset);
 299
 300         if (buf == NULL) {
 301                 buf = malloc(sizeof(*buf));
 302                 bzero(buf, sizeof(*buf));
 303                 buf->buf_offset = buf_offset;
 304                 buf->raw_offset = hammer_xlate_to_phys(volume->ondisk,
 305                                                         buf_offset);
 306                 buf->volume = volume;
 307                 buf->ondisk = malloc(HAMMER_BUFSIZE);
 308                 if (isnew <= 0) {
 309                         if (readhammerbuf(buf) == -1) {
 310                                 err(1, "get_buffer: %s:%016jx "
 311                                     "Read failed at offset %016jx",
 312                                     volume->name,
 313                                     (intmax_t)buf->buf_offset,
 314                                     (intmax_t)buf->raw_offset);
 315                         }
 316                 }
 317
 318                 hi = buffer_hash(buf_offset);
 319                 TAILQ_INSERT_TAIL(&volume->buffer_lists[hi], buf, entry);
 320                 hammer_cache_add(&buf->cache);
 321                 dora = (isnew == 0);
 322         } else {
 323                 assert(buf->ondisk != NULL);
 324                 assert(isnew != -1);
 325                 hammer_cache_used(&buf->cache);
 326         }
 327
 328         ++buf->cache.refs;
 329         hammer_cache_flush();
 330
 331         if (isnew > 0) {
 332                 assert(buf->cache.modified == 0);
 333                 bzero(buf->ondisk, HAMMER_BUFSIZE);
 334                 buf->cache.modified = 1;
 335         }
 336         if (dora)
 337                 get_buffer_readahead(buf);
 338         return(buf);
 339 }
 340
 341 static void
 342 get_buffer_readahead(struct buffer_info *base)
 343 {
 344         struct buffer_info *buf;
 345         struct volume_info *vol;
 346         hammer_off_t buf_offset;
 347         int64_t raw_offset;
 348         int ri = UseReadBehind;
 349         int re = UseReadAhead;
 350
 351         raw_offset = base->raw_offset + ri * HAMMER_BUFSIZE;
 352         vol = base->volume;
 353
 354         while (ri < re) {
 355                 if (raw_offset >= vol->ondisk->vol_buf_end)
 356                         break;
 357                 if (raw_offset < vol->ondisk->vol_buf_beg || ri == 0) {
 358                         ++ri;
 359                         raw_offset += HAMMER_BUFSIZE;
 360                         continue;
 361                 }
 362                 buf_offset = HAMMER_ENCODE_RAW_BUFFER(vol->vol_no,
 363                         raw_offset - vol->ondisk->vol_buf_beg);
 364                 buf = find_buffer(vol, buf_offset);
 365                 if (buf == NULL) {
 366                         buf = get_buffer(buf_offset, -1);
 367                         rel_buffer(buf);
 368                 }
 369                 ++ri;
 370                 raw_offset += HAMMER_BUFSIZE;
 371         }
 372 }
 373
 374 void
 375 rel_buffer(struct buffer_info *buffer)
 376 {
 377         struct volume_info *volume;
 378         int hi;
 379
 380         if (buffer == NULL)
 381                 return;
 382         assert(buffer->cache.refs > 0);
 383         if (--buffer->cache.refs == 0) {
 384                 if (buffer->cache.delete) {
 385                         hi = buffer_hash(buffer->buf_offset);
 386                         volume = buffer->volume;
 387                         if (buffer->cache.modified)
 388                                 flush_buffer(buffer);
 389                         TAILQ_REMOVE(&volume->buffer_lists[hi], buffer, entry);
 390                         hammer_cache_del(&buffer->cache);
 391                         free(buffer->ondisk);
 392                         free(buffer);
 393                 }
 394         }
 395 }
 396
 397 /*
 398  * Retrieve a pointer to a buffer data given a buffer offset.  The underlying
 399  * bufferp is freed if isnew or the offset is out of range of the cached data.
 400  * If bufferp is freed a referenced buffer is loaded into it.
 401  */
 402 void *
 403 get_buffer_data(hammer_off_t buf_offset, struct buffer_info **bufferp,
 404                 int isnew)
 405 {
 406         if (*bufferp != NULL) {
 407                 if (isnew > 0 ||
 408                     (((*bufferp)->buf_offset ^ buf_offset) & ~HAMMER_BUFMASK64)) {
 409                         rel_buffer(*bufferp);
 410                         *bufferp = NULL;
 411                 }
 412         }
 413         return(get_ondisk(buf_offset, bufferp, isnew));
 414 }
 415
 416 /*
 417  * Return a pointer to a buffer data given a buffer offset.
 418  * If *bufferp is NULL acquire the buffer otherwise use that buffer.
 419  */
 420 static void *
 421 get_ondisk(hammer_off_t buf_offset, struct buffer_info **bufferp, int isnew)
 422 {
 423         if (*bufferp == NULL) {
 424                 *bufferp = get_buffer(buf_offset, isnew);
 425                 if (*bufferp == NULL)
 426                         return(NULL);
 427         }
 428
 429         return(((char *)(*bufferp)->ondisk) +
 430                 ((int32_t)buf_offset & HAMMER_BUFMASK));
 431 }
 432
 433 /*
 434  * Allocate HAMMER elements - B-Tree nodes
 435  */
 436 void *
 437 alloc_btree_element(hammer_off_t *offp, struct buffer_info **data_bufferp)
 438 {
 439         hammer_node_ondisk_t node;
 440
 441         node = alloc_blockmap(HAMMER_ZONE_BTREE_INDEX, sizeof(*node),
 442                               offp, data_bufferp);
 443         bzero(node, sizeof(*node));
 444         return (node);
 445 }
 446
 447 /*
 448  * Allocate HAMMER elements - meta data (inode, direntry, PFS, etc)
 449  */
 450 void *
 451 alloc_meta_element(hammer_off_t *offp, int32_t data_len,
 452                    struct buffer_info **data_bufferp)
 453 {
 454         void *data;
 455
 456         data = alloc_blockmap(HAMMER_ZONE_META_INDEX, data_len,
 457                               offp, data_bufferp);
 458         bzero(data, data_len);
 459         return (data);
 460 }
 461
 462 /*
 463  * Allocate HAMMER elements - data storage
 464  *
 465  * The only data_len supported by HAMMER userspace for large data zone
 466  * (zone 10) is HAMMER_BUFSIZE which is 16KB.  >16KB data does not fit
 467  * in a buffer allocated by get_buffer().  Also alloc_blockmap() does
 468  * not consider >16KB buffer size.
 469  */
 470 void *
 471 alloc_data_element(hammer_off_t *offp, int32_t data_len,
 472                    struct buffer_info **data_bufferp)
 473 {
 474         void *data;
 475         int zone;
 476
 477         if (data_len == 0)
 478                 return(NULL);
 479
 480         zone = hammer_data_zone_index(data_len);
 481         assert(data_len <= HAMMER_BUFSIZE); /* just one buffer */
 482         assert(zone == HAMMER_ZONE_LARGE_DATA_INDEX ||
 483                zone == HAMMER_ZONE_SMALL_DATA_INDEX);
 484
 485         data = alloc_blockmap(zone, data_len, offp, data_bufferp);
 486         bzero(data, data_len);
 487         return(data);
 488 }
 489
 490 /*
 491  * Format a new blockmap.  This is mostly a degenerate case because
 492  * all allocations are now actually done from the freemap.
 493  */
 494 void
 495 format_blockmap(struct volume_info *root_vol, int zone, hammer_off_t offset)
 496 {
 497         hammer_blockmap_t blockmap;
 498         hammer_off_t zone_base;
 499
 500         /* Only root volume needs formatting */
 501         assert(root_vol->vol_no == HAMMER_ROOT_VOLNO);
 502
 503         assert(hammer_is_zone2_mapped_index(zone));
 504
 505         blockmap = &root_vol->ondisk->vol0_blockmap[zone];
 506         zone_base = HAMMER_ZONE_ENCODE(zone, offset);
 507
 508         bzero(blockmap, sizeof(*blockmap));
 509         blockmap->phys_offset = 0;
 510         blockmap->first_offset = zone_base;
 511         blockmap->next_offset = zone_base;
 512         blockmap->alloc_offset = HAMMER_ENCODE(zone, 255, -1);
 513         hammer_crc_set_blockmap(blockmap);
 514 }
 515
 516 /*
 517  * Format a new freemap.  Set all layer1 entries to UNAVAIL.  The initialize
 518  * code will load each volume's freemap.
 519  */
 520 void
 521 format_freemap(struct volume_info *root_vol)
 522 {
 523         struct buffer_info *buffer = NULL;
 524         hammer_off_t layer1_offset;
 525         hammer_blockmap_t blockmap;
 526         hammer_blockmap_layer1_t layer1;
 527         int i, isnew;
 528
 529         /* Only root volume needs formatting */
 530         assert(root_vol->vol_no == HAMMER_ROOT_VOLNO);
 531
 532         layer1_offset = alloc_bigblock(root_vol, HAMMER_ZONE_FREEMAP_INDEX);
 533         for (i = 0; i < HAMMER_BIGBLOCK_SIZE; i += sizeof(*layer1)) {
 534                 isnew = ((i % HAMMER_BUFSIZE) == 0);
 535                 layer1 = get_buffer_data(layer1_offset + i, &buffer, isnew);
 536                 bzero(layer1, sizeof(*layer1));
 537                 layer1->phys_offset = HAMMER_BLOCKMAP_UNAVAIL;
 538                 layer1->blocks_free = 0;
 539                 hammer_crc_set_layer1(layer1);
 540         }
 541         assert(i == HAMMER_BIGBLOCK_SIZE);
 542         rel_buffer(buffer);
 543
 544         blockmap = &root_vol->ondisk->vol0_blockmap[HAMMER_ZONE_FREEMAP_INDEX];
 545         bzero(blockmap, sizeof(*blockmap));
 546         blockmap->phys_offset = layer1_offset;
 547         blockmap->first_offset = 0;
 548         blockmap->next_offset = HAMMER_ENCODE_RAW_BUFFER(0, 0);
 549         blockmap->alloc_offset = HAMMER_ENCODE_RAW_BUFFER(255, -1);
 550         hammer_crc_set_blockmap(blockmap);
 551 }
 552
 553 /*
 554  * Load the volume's remaining free space into the freemap.
 555  *
 556  * Returns the number of big-blocks available.
 557  */
 558 int64_t
 559 initialize_freemap(struct volume_info *vol)
 560 {
 561         struct volume_info *root_vol;
 562         struct buffer_info *buffer1 = NULL;
 563         struct buffer_info *buffer2 = NULL;
 564         hammer_blockmap_layer1_t layer1;
 565         hammer_blockmap_layer2_t layer2;
 566         hammer_off_t layer1_offset;
 567         hammer_off_t layer2_offset;
 568         hammer_off_t phys_offset;
 569         hammer_off_t block_offset;
 570         hammer_off_t aligned_vol_free_end;
 571         hammer_blockmap_t freemap;
 572         int64_t count = 0;
 573         int64_t layer1_count = 0;
 574
 575         root_vol = get_root_volume();
 576
 577         assert_volume_offset(vol);
 578         aligned_vol_free_end = (vol->vol_free_end + HAMMER_BLOCKMAP_LAYER2_MASK)
 579                                 & ~HAMMER_BLOCKMAP_LAYER2_MASK;
 580
 581         printf("initialize freemap volume %d\n", vol->vol_no);
 582
 583         /*
 584          * Initialize the freemap.  First preallocate the big-blocks required
 585          * to implement layer2.   This preallocation is a bootstrap allocation
 586          * using blocks from the target volume.
 587          */
 588         freemap = &root_vol->ondisk->vol0_blockmap[HAMMER_ZONE_FREEMAP_INDEX];
 589
 590         for (phys_offset = HAMMER_ENCODE_RAW_BUFFER(vol->vol_no, 0);
 591              phys_offset < aligned_vol_free_end;
 592              phys_offset += HAMMER_BLOCKMAP_LAYER2) {
 593                 layer1_offset = freemap->phys_offset +
 594                                 HAMMER_BLOCKMAP_LAYER1_OFFSET(phys_offset);
 595                 layer1 = get_buffer_data(layer1_offset, &buffer1, 0);
 596                 if (layer1->phys_offset == HAMMER_BLOCKMAP_UNAVAIL) {
 597                         layer1->phys_offset = alloc_bigblock(vol,
 598                                                 HAMMER_ZONE_FREEMAP_INDEX);
 599                         layer1->blocks_free = 0;
 600                         buffer1->cache.modified = 1;
 601                         hammer_crc_set_layer1(layer1);
 602                 }
 603         }
 604
 605         /*
 606          * Now fill everything in.
 607          */
 608         for (phys_offset = HAMMER_ENCODE_RAW_BUFFER(vol->vol_no, 0);
 609              phys_offset < aligned_vol_free_end;
 610              phys_offset += HAMMER_BLOCKMAP_LAYER2) {
 611                 layer1_count = 0;
 612                 layer1_offset = freemap->phys_offset +
 613                                 HAMMER_BLOCKMAP_LAYER1_OFFSET(phys_offset);
 614                 layer1 = get_buffer_data(layer1_offset, &buffer1, 0);
 615                 assert(layer1->phys_offset != HAMMER_BLOCKMAP_UNAVAIL);
 616
 617                 for (block_offset = 0;
 618                      block_offset < HAMMER_BLOCKMAP_LAYER2;
 619                      block_offset += HAMMER_BIGBLOCK_SIZE) {
 620                         layer2_offset = layer1->phys_offset +
 621                                         HAMMER_BLOCKMAP_LAYER2_OFFSET(block_offset);
 622                         layer2 = get_buffer_data(layer2_offset, &buffer2, 0);
 623                         bzero(layer2, sizeof(*layer2));
 624
 625                         if (phys_offset + block_offset < vol->vol_free_off) {
 626                                 /*
 627                                  * Fixups XXX - big-blocks already allocated as part
 628                                  * of the freemap bootstrap.
 629                                  */
 630                                 layer2->zone = HAMMER_ZONE_FREEMAP_INDEX;
 631                                 layer2->append_off = HAMMER_BIGBLOCK_SIZE;
 632                                 layer2->bytes_free = 0;
 633                         } else if (phys_offset + block_offset < vol->vol_free_end) {
 634                                 layer2->zone = 0;
 635                                 layer2->append_off = 0;
 636                                 layer2->bytes_free = HAMMER_BIGBLOCK_SIZE;
 637                                 ++count;
 638                                 ++layer1_count;
 639                         } else {
 640                                 layer2->zone = HAMMER_ZONE_UNAVAIL_INDEX;
 641                                 layer2->append_off = HAMMER_BIGBLOCK_SIZE;
 642                                 layer2->bytes_free = 0;
 643                         }
 644                         hammer_crc_set_layer2(layer2);
 645                         buffer2->cache.modified = 1;
 646                 }
 647
 648                 layer1->blocks_free += layer1_count;
 649                 hammer_crc_set_layer1(layer1);
 650                 buffer1->cache.modified = 1;
 651         }
 652
 653         rel_buffer(buffer1);
 654         rel_buffer(buffer2);
 655         return(count);
 656 }
 657
 658 /*
 659  * Returns the number of big-blocks available for filesystem data and undos
 660  * without formatting.
 661  */
 662 int64_t
 663 count_freemap(struct volume_info *vol)
 664 {
 665         hammer_off_t phys_offset;
 666         hammer_off_t vol_free_off;
 667         hammer_off_t aligned_vol_free_end;
 668         int64_t count = 0;
 669
 670         vol_free_off = HAMMER_ENCODE_RAW_BUFFER(vol->vol_no, 0);
 671
 672         assert_volume_offset(vol);
 673         aligned_vol_free_end = (vol->vol_free_end + HAMMER_BLOCKMAP_LAYER2_MASK)
 674                                 & ~HAMMER_BLOCKMAP_LAYER2_MASK;
 675
 676         if (vol->vol_no == HAMMER_ROOT_VOLNO)
 677                 vol_free_off += HAMMER_BIGBLOCK_SIZE;
 678
 679         for (phys_offset = HAMMER_ENCODE_RAW_BUFFER(vol->vol_no, 0);
 680              phys_offset < aligned_vol_free_end;
 681              phys_offset += HAMMER_BLOCKMAP_LAYER2) {
 682                 vol_free_off += HAMMER_BIGBLOCK_SIZE;
 683         }
 684
 685         for (phys_offset = HAMMER_ENCODE_RAW_BUFFER(vol->vol_no, 0);
 686              phys_offset < aligned_vol_free_end;
 687              phys_offset += HAMMER_BIGBLOCK_SIZE) {
 688                 if (phys_offset < vol_free_off) {
 689                         ;
 690                 } else if (phys_offset < vol->vol_free_end) {
 691                         ++count;
 692                 }
 693         }
 694
 695         return(count);
 696 }
 697
 698 /*
 699  * Format the undomap for the root volume.
 700  */
 701 void
 702 format_undomap(struct volume_info *root_vol, int64_t *undo_buffer_size)
 703 {
 704         const int undo_zone = HAMMER_ZONE_UNDO_INDEX;
 705         hammer_off_t undo_limit;
 706         hammer_blockmap_t blockmap;
 707         hammer_volume_ondisk_t ondisk;
 708         struct buffer_info *buffer = NULL;
 709         hammer_off_t scan;
 710         int n;
 711         int limit_index;
 712         uint32_t seqno;
 713
 714         /* Only root volume needs formatting */
 715         assert(root_vol->vol_no == HAMMER_ROOT_VOLNO);
 716         ondisk = root_vol->ondisk;
 717
 718         /*
 719          * Size the undo buffer in multiples of HAMMER_BIGBLOCK_SIZE,
 720          * up to HAMMER_UNDO_LAYER2 big-blocks.  Size to approximately
 721          * 0.1% of the disk.
 722          *
 723          * The minimum UNDO fifo size is 500MB, or approximately 1% of
 724          * the recommended 50G disk.
 725          *
 726          * Changing this minimum is rather dangerous as complex filesystem
 727          * operations can cause the UNDO FIFO to fill up otherwise.
 728          */
 729         undo_limit = *undo_buffer_size;
 730         if (undo_limit == 0) {
 731                 undo_limit = HAMMER_VOL_BUF_SIZE(ondisk) / 1000;
 732                 if (undo_limit < 500*1024*1024)
 733                         undo_limit = 500*1024*1024;
 734         }
 735         undo_limit = (undo_limit + HAMMER_BIGBLOCK_MASK64) &
 736                      ~HAMMER_BIGBLOCK_MASK64;
 737         if (undo_limit < HAMMER_BIGBLOCK_SIZE)
 738                 undo_limit = HAMMER_BIGBLOCK_SIZE;
 739         if (undo_limit > HAMMER_BIGBLOCK_SIZE * HAMMER_UNDO_LAYER2)
 740                 undo_limit = HAMMER_BIGBLOCK_SIZE * HAMMER_UNDO_LAYER2;
 741         *undo_buffer_size = undo_limit;
 742
 743         blockmap = &ondisk->vol0_blockmap[undo_zone];
 744         bzero(blockmap, sizeof(*blockmap));
 745         blockmap->phys_offset = HAMMER_BLOCKMAP_UNAVAIL;
 746         blockmap->first_offset = HAMMER_ZONE_ENCODE(undo_zone, 0);
 747         blockmap->next_offset = blockmap->first_offset;
 748         blockmap->alloc_offset = HAMMER_ZONE_ENCODE(undo_zone, undo_limit);
 749         hammer_crc_set_blockmap(blockmap);
 750
 751         limit_index = undo_limit / HAMMER_BIGBLOCK_SIZE;
 752         assert(limit_index <= HAMMER_UNDO_LAYER2);
 753
 754         for (n = 0; n < limit_index; ++n) {
 755                 ondisk->vol0_undo_array[n] = alloc_bigblock(root_vol,
 756                                                         HAMMER_ZONE_UNDO_INDEX);
 757         }
 758         while (n < HAMMER_UNDO_LAYER2) {
 759                 ondisk->vol0_undo_array[n++] = HAMMER_BLOCKMAP_UNAVAIL;
 760         }
 761
 762         /*
 763          * Pre-initialize the UNDO blocks (HAMMER version 4+)
 764          */
 765         printf("initializing the undo map (%jd MB)\n",
 766                 (intmax_t)(blockmap->alloc_offset & HAMMER_OFF_LONG_MASK) /
 767                 (1024 * 1024));
 768
 769         scan = blockmap->first_offset;
 770         seqno = 0;
 771
 772         while (scan < blockmap->alloc_offset) {
 773                 hammer_fifo_head_t head;
 774                 hammer_fifo_tail_t tail;
 775                 int isnew;
 776                 int bytes = HAMMER_UNDO_ALIGN;
 777
 778                 isnew = ((scan & HAMMER_BUFMASK64) == 0);
 779                 head = get_buffer_data(scan, &buffer, isnew);
 780                 buffer->cache.modified = 1;
 781                 tail = (void *)((char *)head + bytes - sizeof(*tail));
 782
 783                 bzero(head, bytes);
 784                 head->hdr_signature = HAMMER_HEAD_SIGNATURE;
 785                 head->hdr_type = HAMMER_HEAD_TYPE_DUMMY;
 786                 head->hdr_size = bytes;
 787                 head->hdr_seq = seqno++;
 788
 789                 tail->tail_signature = HAMMER_TAIL_SIGNATURE;
 790                 tail->tail_type = HAMMER_HEAD_TYPE_DUMMY;
 791                 tail->tail_size = bytes;
 792
 793                 hammer_crc_set_fifo_head(head, bytes);
 794
 795                 scan += bytes;
 796         }
 797         rel_buffer(buffer);
 798 }
 799
 800 const char *zone_labels[] = {
 801         "",             /* 0 */
 802         "raw_volume",   /* 1 */
 803         "raw_buffer",   /* 2 */
 804         "undo",         /* 3 */
 805         "freemap",      /* 4 */
 806         "",             /* 5 */
 807         "",             /* 6 */
 808         "",             /* 7 */
 809         "btree",        /* 8 */
 810         "meta",         /* 9 */
 811         "large_data",   /* 10 */
 812         "small_data",   /* 11 */
 813         "",             /* 12 */
 814         "",             /* 13 */
 815         "",             /* 14 */
 816         "unavail",      /* 15 */
 817 };
 818
 819 void
 820 print_blockmap(const struct volume_info *root_vol)
 821 {
 822         hammer_blockmap_t blockmap;
 823         hammer_volume_ondisk_t ondisk;
 824         int64_t size, used;
 825         int i;
 826 #define INDENT ""
 827
 828         ondisk = root_vol->ondisk;
 829         printf(INDENT"vol_label\t%s\n", ondisk->vol_label);
 830         printf(INDENT"vol_count\t%d\n", ondisk->vol_count);
 831         printf(INDENT"vol_bot_beg\t%s\n", sizetostr(ondisk->vol_bot_beg));
 832         printf(INDENT"vol_mem_beg\t%s\n", sizetostr(ondisk->vol_mem_beg));
 833         printf(INDENT"vol_buf_beg\t%s\n", sizetostr(ondisk->vol_buf_beg));
 834         printf(INDENT"vol_buf_end\t%s\n", sizetostr(ondisk->vol_buf_end));
 835         printf(INDENT"vol0_next_tid\t%016jx\n",
 836                (uintmax_t)ondisk->vol0_next_tid);
 837
 838         blockmap = &ondisk->vol0_blockmap[HAMMER_ZONE_UNDO_INDEX];
 839         size = blockmap->alloc_offset & HAMMER_OFF_LONG_MASK;
 840         if (blockmap->first_offset <= blockmap->next_offset)
 841                 used = blockmap->next_offset - blockmap->first_offset;
 842         else
 843                 used = blockmap->alloc_offset - blockmap->first_offset +
 844                         (blockmap->next_offset & HAMMER_OFF_LONG_MASK);
 845         printf(INDENT"undo_size\t%s\n", sizetostr(size));
 846         printf(INDENT"undo_used\t%s\n", sizetostr(used));
 847
 848         printf(INDENT"zone #             "
 849                "phys             first            next             alloc\n");
 850         for (i = 0; i < HAMMER_MAX_ZONES; i++) {
 851                 blockmap = &ondisk->vol0_blockmap[i];
 852                 printf(INDENT"zone %-2d %-10s %016jx %016jx %016jx %016jx\n",
 853                         i, zone_labels[i],
 854                         (uintmax_t)blockmap->phys_offset,
 855                         (uintmax_t)blockmap->first_offset,
 856                         (uintmax_t)blockmap->next_offset,
 857                         (uintmax_t)blockmap->alloc_offset);
 858         }
 859 }
 860
 861 /*
 862  * Flush various tracking structures to disk
 863  */
 864 void
 865 flush_all_volumes(void)
 866 {
 867         struct volume_info *vol;
 868
 869         TAILQ_FOREACH(vol, &VolList, entry)
 870                 flush_volume(vol);
 871 }
 872
 873 void
 874 flush_volume(struct volume_info *volume)
 875 {
 876         struct buffer_info *buffer;
 877         int i;
 878
 879         for (i = 0; i < HAMMER_BUFLISTS; ++i) {
 880                 TAILQ_FOREACH(buffer, &volume->buffer_lists[i], entry)
 881                         flush_buffer(buffer);
 882         }
 883         if (writehammervol(volume) == -1)
 884                 err(1, "Write volume %d (%s)", volume->vol_no, volume->name);
 885 }
 886
 887 void
 888 flush_buffer(struct buffer_info *buffer)
 889 {
 890         struct volume_info *vol;
 891
 892         vol = buffer->volume;
 893         if (writehammerbuf(buffer) == -1)
 894                 err(1, "Write volume %d (%s)", vol->vol_no, vol->name);
 895         buffer->cache.modified = 0;
 896 }
 897
 898 /*
 899  * Core I/O operations
 900  */
 901 static int
 902 __read(struct volume_info *vol, void *data, int64_t offset, int size)
 903 {
 904         ssize_t n;
 905
 906         n = pread(vol->fd, data, size, offset);
 907         if (n != size)
 908                 return(-1);
 909         return(0);
 910 }
 911
 912 static __inline int
 913 readhammervol(struct volume_info *vol)
 914 {
 915         return(__read(vol, vol->ondisk, 0, HAMMER_BUFSIZE));
 916 }
 917
 918 static __inline int
 919 readhammerbuf(struct buffer_info *buf)
 920 {
 921         return(__read(buf->volume, buf->ondisk, buf->raw_offset, HAMMER_BUFSIZE));
 922 }
 923
 924 static int
 925 __write(struct volume_info *vol, const void *data, int64_t offset, int size)
 926 {
 927         ssize_t n;
 928
 929         if (vol->rdonly)
 930                 return(0);
 931
 932         n = pwrite(vol->fd, data, size, offset);
 933         if (n != size)
 934                 return(-1);
 935         return(0);
 936 }
 937
 938 static __inline int
 939 writehammervol(struct volume_info *vol)
 940 {
 941         return(__write(vol, vol->ondisk, 0, HAMMER_BUFSIZE));
 942 }
 943
 944 static __inline int
 945 writehammerbuf(struct buffer_info *buf)
 946 {
 947         return(__write(buf->volume, buf->ondisk, buf->raw_offset, HAMMER_BUFSIZE));
 948 }
 949
 950 int64_t init_boot_area_size(int64_t value, off_t avg_vol_size)
 951 {
 952         if (value == 0) {
 953                 value = HAMMER_BOOT_NOMBYTES;
 954                 while (value > avg_vol_size / HAMMER_MAX_VOLUMES)
 955                         value >>= 1;
 956                 if (value < HAMMER_BOOT_MINBYTES)
 957                         value = 0;
 958         } else if (value < HAMMER_BOOT_MINBYTES) {
 959                 value = HAMMER_BOOT_MINBYTES;
 960         }
 961
 962         return(value);
 963 }
 964
 965 int64_t init_mem_area_size(int64_t value, off_t avg_vol_size)
 966 {
 967         if (value == 0) {
 968                 value = HAMMER_MEM_NOMBYTES;
 969                 while (value > avg_vol_size / HAMMER_MAX_VOLUMES)
 970                         value >>= 1;
 971                 if (value < HAMMER_MEM_MINBYTES)
 972                         value = 0;
 973         } else if (value < HAMMER_MEM_MINBYTES) {
 974                 value = HAMMER_MEM_MINBYTES;
 975         }
 976
 977         return(value);
 978 }