1 /* 2 * Copyright (c) 2011-2015 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Matthew Dillon <dillon@dragonflybsd.org> 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/types.h> 36 #include <sys/diskslice.h> 37 #include <sys/diskmbr.h> 38 #include <sys/stat.h> 39 #include <sys/time.h> 40 #include <sys/sysctl.h> 41 #include <sys/ioctl.h> 42 #include <vfs/hammer2/hammer2_xxhash.h> 43 #include <vfs/hammer2/hammer2_disk.h> 44 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <stdarg.h> 48 #include <stddef.h> 49 #include <unistd.h> 50 #include <string.h> 51 #include <errno.h> 52 #include <fcntl.h> 53 #include <assert.h> 54 #include <err.h> 55 #include <uuid.h> 56 57 #define MAXLABELS HAMMER2_SET_COUNT 58 59 #define hammer2_icrc32(buf, size) iscsi_crc32((buf), (size)) 60 #define hammer2_icrc32c(buf, size, crc) iscsi_crc32_ext((buf), (size), (crc)) 61 uint32_t iscsi_crc32(const void *buf, size_t size); 62 uint32_t iscsi_crc32_ext(const void *buf, size_t size, uint32_t ocrc); 63 64 static hammer2_off_t check_volume(const char *path, int *fdp); 65 static int64_t getsize(const char *str, int64_t minval, int64_t maxval, int pw); 66 static const char *sizetostr(hammer2_off_t size); 67 static uint64_t nowtime(void); 68 static int blkrefary_cmp(const void *b1, const void *b2); 69 static void usage(void); 70 71 static void format_hammer2(int fd, hammer2_off_t total_space, 72 hammer2_off_t free_space); 73 static void alloc_direct(hammer2_off_t *basep, hammer2_blockref_t *bref, 74 size_t bytes); 75 static hammer2_key_t dirhash(const unsigned char *name, size_t len); 76 77 static int Hammer2Version = -1; 78 static int ForceOpt = 0; 79 static uuid_t Hammer2_FSType; /* static filesystem type id for HAMMER2 */ 80 static uuid_t Hammer2_VolFSID; /* unique filesystem id in volu header */ 81 static uuid_t Hammer2_SupCLID; /* PFS cluster id in super-root inode */ 82 static uuid_t Hammer2_SupFSID; /* PFS unique id in super-root inode */ 83 static uuid_t Hammer2_PfsCLID[MAXLABELS]; 84 static uuid_t Hammer2_PfsFSID[MAXLABELS]; 85 static const char *Label[MAXLABELS]; 86 static hammer2_off_t BootAreaSize; 87 static hammer2_off_t AuxAreaSize; 88 static int NLabels; 89 90 #define GIG ((hammer2_off_t)1024*1024*1024) 91 92 int 93 main(int ac, char **av) 94 { 95 uint32_t status; 96 hammer2_off_t total_space; 97 hammer2_off_t free_space; 98 hammer2_off_t reserved_space; 99 int ch; 100 int fd = -1; 101 int i; 102 int defaultlabels = 1; 103 char *vol_fsid; 104 char *sup_clid_name; 105 char *sup_fsid_name; 106 char *pfs_clid_name; 107 char *pfs_fsid_name; 108 109 Label[NLabels++] = "LOCAL"; 110 111 /* 112 * Sanity check basic filesystem structures. No cookies for us 113 * if it gets broken! 114 */ 115 assert(sizeof(hammer2_volume_data_t) == HAMMER2_VOLUME_BYTES); 116 assert(sizeof(hammer2_inode_data_t) == HAMMER2_INODE_BYTES); 117 assert(sizeof(hammer2_blockref_t) == HAMMER2_BLOCKREF_BYTES); 118 119 /* 120 * Generate a filesystem id and lookup the filesystem type 121 */ 122 srandomdev(); 123 uuidgen(&Hammer2_VolFSID, 1); 124 uuidgen(&Hammer2_SupCLID, 1); 125 uuidgen(&Hammer2_SupFSID, 1); 126 uuid_from_string(HAMMER2_UUID_STRING, &Hammer2_FSType, &status); 127 /*uuid_name_lookup(&Hammer2_FSType, "DragonFly HAMMER2", &status);*/ 128 if (status != uuid_s_ok) { 129 errx(1, "uuids file does not have the DragonFly " 130 "HAMMER2 filesystem type"); 131 } 132 133 /* 134 * Parse arguments 135 */ 136 while ((ch = getopt(ac, av, "fL:b:m:r:V:")) != -1) { 137 switch(ch) { 138 case 'f': 139 ForceOpt = 1; 140 break; 141 case 'L': 142 defaultlabels = 0; 143 if (strcasecmp(optarg, "none") == 0) { 144 break; 145 } 146 if (NLabels >= MAXLABELS) { 147 errx(1, 148 "Limit of %d local labels", 149 MAXLABELS - 1); 150 } 151 Label[NLabels++] = optarg; 152 if (strlen(Label[NLabels-1]) > HAMMER2_INODE_MAXNAME) { 153 errx(1, "Volume label '%s' is too long " 154 "(64 chars max)\n", optarg); 155 } 156 break; 157 case 'b': 158 BootAreaSize = getsize(optarg, 159 HAMMER2_NEWFS_ALIGN, 160 HAMMER2_BOOT_MAX_BYTES, 2); 161 break; 162 case 'r': 163 AuxAreaSize = getsize(optarg, 164 HAMMER2_NEWFS_ALIGN, 165 HAMMER2_REDO_MAX_BYTES, 2); 166 break; 167 case 'V': 168 Hammer2Version = strtol(optarg, NULL, 0); 169 if (Hammer2Version < HAMMER2_VOL_VERSION_MIN || 170 Hammer2Version >= HAMMER2_VOL_VERSION_WIP) { 171 errx(1, 172 "I don't understand how to format " 173 "HAMMER2 version %d\n", 174 Hammer2Version); 175 } 176 break; 177 default: 178 usage(); 179 break; 180 } 181 } 182 183 /* 184 * Check Hammer2 version 185 */ 186 if (Hammer2Version < 0) { 187 size_t olen = sizeof(Hammer2Version); 188 Hammer2Version = HAMMER2_VOL_VERSION_DEFAULT; 189 if (sysctlbyname("vfs.hammer2.supported_version", 190 &Hammer2Version, &olen, NULL, 0) == 0) { 191 if (Hammer2Version >= HAMMER2_VOL_VERSION_WIP) { 192 Hammer2Version = HAMMER2_VOL_VERSION_WIP - 1; 193 fprintf(stderr, 194 "newfs_hammer2: WARNING: HAMMER2 VFS " 195 "supports higher version than I " 196 "understand,\n" 197 "using version %d\n", 198 Hammer2Version); 199 } 200 } else { 201 fprintf(stderr, 202 "newfs_hammer2: WARNING: HAMMER2 VFS not " 203 "loaded, cannot get version info.\n" 204 "Using version %d\n", 205 HAMMER2_VOL_VERSION_DEFAULT); 206 } 207 } 208 209 ac -= optind; 210 av += optind; 211 212 if (ac != 1 || av[0][0] == 0) { 213 fprintf(stderr, "Exactly one disk device must be specified\n"); 214 exit(1); 215 } 216 217 /* 218 * Adjust Label[] and NLabels. 219 */ 220 if (defaultlabels) { 221 char c = av[0][strlen(av[0]) - 1]; 222 if (c == 'a') 223 Label[NLabels++] = "BOOT"; 224 else if (c == 'd') 225 Label[NLabels++] = "ROOT"; 226 else 227 Label[NLabels++] = "DATA"; 228 } 229 230 /* 231 * Collect volume information. 232 */ 233 total_space = check_volume(av[0], &fd); 234 235 /* 236 * ~typically 8MB alignment to avoid edge cases for reserved blocks 237 * and so raid stripes (if any) operate efficiently. 238 */ 239 total_space &= ~HAMMER2_VOLUME_ALIGNMASK64; 240 241 /* 242 * Calculate defaults for the boot area size and round to the 243 * volume alignment boundary. 244 * 245 * NOTE: These areas are currently not used for booting but are 246 * reserved for future filesystem expansion. 247 */ 248 if (BootAreaSize == 0) { 249 BootAreaSize = HAMMER2_BOOT_NOM_BYTES; 250 while (BootAreaSize > total_space / 20) 251 BootAreaSize >>= 1; 252 if (BootAreaSize < HAMMER2_BOOT_MIN_BYTES) 253 BootAreaSize = HAMMER2_BOOT_MIN_BYTES; 254 } else if (BootAreaSize < HAMMER2_BOOT_MIN_BYTES) { 255 BootAreaSize = HAMMER2_BOOT_MIN_BYTES; 256 } 257 BootAreaSize = (BootAreaSize + HAMMER2_VOLUME_ALIGNMASK64) & 258 ~HAMMER2_VOLUME_ALIGNMASK64; 259 260 /* 261 * Calculate defaults for the redo area size and round to the 262 * volume alignment boundary. 263 * 264 * NOTE: These areas are currently not used for logging but are 265 * reserved for future filesystem expansion. 266 */ 267 if (AuxAreaSize == 0) { 268 AuxAreaSize = HAMMER2_REDO_NOM_BYTES; 269 while (AuxAreaSize > total_space / 20) 270 AuxAreaSize >>= 1; 271 if (AuxAreaSize < HAMMER2_REDO_MIN_BYTES) 272 AuxAreaSize = HAMMER2_REDO_MIN_BYTES; 273 } else if (AuxAreaSize < HAMMER2_REDO_MIN_BYTES) { 274 AuxAreaSize = HAMMER2_REDO_MIN_BYTES; 275 } 276 AuxAreaSize = (AuxAreaSize + HAMMER2_VOLUME_ALIGNMASK64) & 277 ~HAMMER2_VOLUME_ALIGNMASK64; 278 279 /* 280 * We'll need to stuff this in the volume header soon. 281 */ 282 uuid_to_string(&Hammer2_VolFSID, &vol_fsid, &status); 283 uuid_to_string(&Hammer2_SupCLID, &sup_clid_name, &status); 284 uuid_to_string(&Hammer2_SupFSID, &sup_fsid_name, &status); 285 286 /* 287 * Calculate the amount of reserved space. HAMMER2_ZONE_SEG (4MB) 288 * is reserved at the beginning of every 2GB of storage, rounded up. 289 * Thus a 200MB filesystem will still have a 4MB reserve area. 290 * 291 * We also include the boot and redo areas in the reserve. The 292 * reserve is used to help 'df' calculate the amount of available 293 * space. 294 * 295 * XXX I kinda screwed up and made the reserved area on the LEVEL1 296 * boundary rather than the ZONE boundary. LEVEL1 is on 1GB 297 * boundaries rather than 2GB boundaries. Stick with the LEVEL1 298 * boundary. 299 */ 300 reserved_space = ((total_space + HAMMER2_FREEMAP_LEVEL1_MASK) / 301 HAMMER2_FREEMAP_LEVEL1_SIZE) * HAMMER2_ZONE_SEG64; 302 303 free_space = total_space - reserved_space - 304 BootAreaSize - AuxAreaSize; 305 306 format_hammer2(fd, total_space, free_space); 307 fsync(fd); 308 close(fd); 309 310 printf("---------------------------------------------\n"); 311 printf("version: %d\n", Hammer2Version); 312 printf("total-size: %s (%jd bytes)\n", 313 sizetostr(total_space), 314 (intmax_t)total_space); 315 printf("boot-area-size: %s\n", sizetostr(BootAreaSize)); 316 printf("aux-area-size: %s\n", sizetostr(AuxAreaSize)); 317 printf("topo-reserved: %s\n", sizetostr(reserved_space)); 318 printf("free-space: %s\n", sizetostr(free_space)); 319 printf("vol-fsid: %s\n", vol_fsid); 320 printf("sup-clid: %s\n", sup_clid_name); 321 printf("sup-fsid: %s\n", sup_fsid_name); 322 for (i = 0; i < NLabels; ++i) { 323 printf("PFS \"%s\"\n", Label[i]); 324 uuid_to_string(&Hammer2_PfsCLID[i], &pfs_clid_name, &status); 325 uuid_to_string(&Hammer2_PfsFSID[i], &pfs_fsid_name, &status); 326 printf(" clid %s\n", pfs_clid_name); 327 printf(" fsid %s\n", pfs_fsid_name); 328 } 329 printf("\n"); 330 331 free(vol_fsid); 332 free(sup_clid_name); 333 free(sup_fsid_name); 334 free(pfs_clid_name); 335 free(pfs_fsid_name); 336 337 return(0); 338 } 339 340 static 341 void 342 usage(void) 343 { 344 fprintf(stderr, 345 "usage: newfs_hammer2 -L label [-f] [-b bootsize] " 346 "[-r redosize] [-V version] special ...\n" 347 ); 348 exit(1); 349 } 350 351 /* 352 * Convert the size in bytes to a human readable string. 353 */ 354 static 355 const char * 356 sizetostr(hammer2_off_t size) 357 { 358 static char buf[32]; 359 360 if (size < 1024 / 2) { 361 snprintf(buf, sizeof(buf), "%6.2f", (double)size); 362 } else if (size < 1024 * 1024 / 2) { 363 snprintf(buf, sizeof(buf), "%6.2fKB", 364 (double)size / 1024); 365 } else if (size < 1024 * 1024 * 1024LL / 2) { 366 snprintf(buf, sizeof(buf), "%6.2fMB", 367 (double)size / (1024 * 1024)); 368 } else if (size < 1024 * 1024 * 1024LL * 1024LL / 2) { 369 snprintf(buf, sizeof(buf), "%6.2fGB", 370 (double)size / (1024 * 1024 * 1024LL)); 371 } else { 372 snprintf(buf, sizeof(buf), "%6.2fTB", 373 (double)size / (1024 * 1024 * 1024LL * 1024LL)); 374 } 375 return(buf); 376 } 377 378 /* 379 * Convert a string to a 64 bit signed integer with various requirements. 380 */ 381 static int64_t 382 getsize(const char *str, int64_t minval, int64_t maxval, int powerof2) 383 { 384 int64_t val; 385 char *ptr; 386 387 val = strtoll(str, &ptr, 0); 388 switch(*ptr) { 389 case 't': 390 case 'T': 391 val *= 1024; 392 /* fall through */ 393 case 'g': 394 case 'G': 395 val *= 1024; 396 /* fall through */ 397 case 'm': 398 case 'M': 399 val *= 1024; 400 /* fall through */ 401 case 'k': 402 case 'K': 403 val *= 1024; 404 break; 405 default: 406 errx(1, "Unknown suffix in number '%s'\n", str); 407 /* not reached */ 408 } 409 if (ptr[1]) { 410 errx(1, "Unknown suffix in number '%s'\n", str); 411 /* not reached */ 412 } 413 if (val < minval) { 414 errx(1, "Value too small: %s, min is %s\n", 415 str, sizetostr(minval)); 416 /* not reached */ 417 } 418 if (val > maxval) { 419 errx(1, "Value too large: %s, max is %s\n", 420 str, sizetostr(maxval)); 421 /* not reached */ 422 } 423 if ((powerof2 & 1) && (val ^ (val - 1)) != ((val << 1) - 1)) { 424 errx(1, "Value not power of 2: %s\n", str); 425 /* not reached */ 426 } 427 if ((powerof2 & 2) && (val & HAMMER2_NEWFS_ALIGNMASK)) { 428 errx(1, "Value not an integral multiple of %dK: %s", 429 HAMMER2_NEWFS_ALIGN / 1024, str); 430 /* not reached */ 431 } 432 return(val); 433 } 434 435 static uint64_t 436 nowtime(void) 437 { 438 struct timeval tv; 439 uint64_t xtime; 440 441 gettimeofday(&tv, NULL); 442 xtime = tv.tv_sec * 1000000LL + tv.tv_usec; 443 return(xtime); 444 } 445 446 /* 447 * Figure out how big the volume is. 448 */ 449 static 450 hammer2_off_t 451 check_volume(const char *path, int *fdp) 452 { 453 struct partinfo pinfo; 454 struct stat st; 455 hammer2_off_t size; 456 457 /* 458 * Get basic information about the volume 459 */ 460 *fdp = open(path, O_RDWR); 461 if (*fdp < 0) 462 err(1, "Unable to open %s R+W", path); 463 if (ioctl(*fdp, DIOCGPART, &pinfo) < 0) { 464 /* 465 * Allow the formatting of regular files as HAMMER2 volumes 466 */ 467 if (fstat(*fdp, &st) < 0) 468 err(1, "Unable to stat %s", path); 469 if (!S_ISREG(st.st_mode)) 470 errx(1, "Unsupported file type for %s", path); 471 size = st.st_size; 472 } else { 473 /* 474 * When formatting a block device as a HAMMER2 volume the 475 * sector size must be compatible. HAMMER2 uses 64K 476 * filesystem buffers but logical buffers for direct I/O 477 * can be as small as HAMMER2_LOGSIZE (16KB). 478 */ 479 if (pinfo.reserved_blocks) { 480 errx(1, "HAMMER2 cannot be placed in a partition " 481 "which overlaps the disklabel or MBR"); 482 } 483 if (pinfo.media_blksize > HAMMER2_PBUFSIZE || 484 HAMMER2_PBUFSIZE % pinfo.media_blksize) { 485 errx(1, "A media sector size of %d is not supported", 486 pinfo.media_blksize); 487 } 488 size = pinfo.media_size; 489 } 490 printf("Volume %-15s size %s\n", path, sizetostr(size)); 491 return (size); 492 } 493 494 /* 495 * Create the volume header, the super-root directory inode, and 496 * the writable snapshot subdirectory (named via the label) which 497 * is to be the initial mount point, or at least the first mount point. 498 * 499 * [----reserved_area----][boot_area][aux_area] 500 * [[vol_hdr]... ] [sroot][root]... 501 * 502 * The sroot and root inodes eat 512 bytes each. newfs labels can only be 503 * 64 bytes so the root (snapshot) inode does not need to extend past 512 504 * bytes. We use the correct hash slot correct but note that because 505 * directory hashes are chained 16x, any slot in the inode will work. 506 * 507 * Also format the allocation map. 508 * 509 * NOTE: The passed total_space is 8MB-aligned to avoid edge cases. 510 */ 511 static 512 void 513 format_hammer2(int fd, hammer2_off_t total_space, hammer2_off_t free_space) 514 { 515 char *buf = malloc(HAMMER2_PBUFSIZE); 516 hammer2_volume_data_t *vol; 517 hammer2_inode_data_t *rawip; 518 hammer2_blockref_t sroot_blockref; 519 hammer2_blockref_t root_blockref[MAXLABELS]; 520 uint64_t now; 521 hammer2_off_t volu_base = 0; 522 hammer2_off_t boot_base = HAMMER2_ZONE_SEG; 523 hammer2_off_t aux_base = boot_base + BootAreaSize; 524 hammer2_off_t alloc_base = aux_base + AuxAreaSize; 525 hammer2_off_t tmp_base; 526 size_t n; 527 int i; 528 529 /* 530 * Clear the entire reserve for the first 2G segment and 531 * make sure we can write to the last block. 532 */ 533 bzero(buf, HAMMER2_PBUFSIZE); 534 tmp_base = volu_base; 535 for (i = 0; i < HAMMER2_ZONE_BLOCKS_SEG; ++i) { 536 n = pwrite(fd, buf, HAMMER2_PBUFSIZE, tmp_base); 537 if (n != HAMMER2_PBUFSIZE) { 538 perror("write"); 539 exit(1); 540 } 541 tmp_base += HAMMER2_PBUFSIZE; 542 } 543 544 n = pwrite(fd, buf, HAMMER2_PBUFSIZE, 545 volu_base + total_space - HAMMER2_PBUFSIZE); 546 if (n != HAMMER2_PBUFSIZE) { 547 perror("write (at-end-of-volume)"); 548 exit(1); 549 } 550 551 /* 552 * Make sure alloc_base won't cross the reserved area at the 553 * beginning of each 2GB zone. 554 * 555 * Reserve space for the super-root inode and the root inode. 556 * Make sure they are in the same 64K block to simplify our code. 557 */ 558 assert((alloc_base & HAMMER2_PBUFMASK) == 0); 559 assert(alloc_base < HAMMER2_ZONE_BYTES64 - HAMMER2_ZONE_SEG); 560 now = nowtime(); 561 bzero(buf, HAMMER2_PBUFSIZE); 562 563 alloc_base &= ~HAMMER2_PBUFMASK64; 564 alloc_direct(&alloc_base, &sroot_blockref, HAMMER2_INODE_BYTES); 565 566 for (i = 0; i < NLabels; ++i) { 567 uuidgen(&Hammer2_PfsCLID[i], 1); 568 uuidgen(&Hammer2_PfsFSID[i], 1); 569 570 alloc_direct(&alloc_base, &root_blockref[i], 571 HAMMER2_INODE_BYTES); 572 assert(((sroot_blockref.data_off ^ root_blockref[i].data_off) & 573 HAMMER2_OFF_MASK_HI) == 0); 574 575 /* 576 * Format the root directory inode, which is left empty. 577 */ 578 rawip = (void *)(buf + (HAMMER2_OFF_MASK_LO & 579 root_blockref[i].data_off)); 580 rawip->meta.version = HAMMER2_INODE_VERSION_ONE; 581 rawip->meta.ctime = now; 582 rawip->meta.mtime = now; 583 /* rawip->atime = now; NOT IMPL MUST BE ZERO */ 584 rawip->meta.btime = now; 585 rawip->meta.type = HAMMER2_OBJTYPE_DIRECTORY; 586 rawip->meta.mode = 0755; 587 rawip->meta.inum = 1; /* root inode, inumber 1 */ 588 rawip->meta.nlinks = 1; /* directory link count compat */ 589 590 rawip->meta.name_len = strlen(Label[i]); 591 bcopy(Label[i], rawip->filename, rawip->meta.name_len); 592 rawip->meta.name_key = 593 dirhash(rawip->filename, rawip->meta.name_len); 594 595 /* 596 * Compression mode and supported copyids. 597 * 598 * Do not allow compression when creating any "BOOT" label 599 * (pfs-create also does the same if the pfs is named "BOOT") 600 */ 601 if (strcasecmp(Label[i], "BOOT") == 0) { 602 rawip->meta.comp_algo = HAMMER2_ENC_ALGO( 603 HAMMER2_COMP_AUTOZERO); 604 rawip->meta.check_algo = HAMMER2_ENC_ALGO( 605 HAMMER2_CHECK_XXHASH64); 606 } else { 607 rawip->meta.comp_algo = HAMMER2_ENC_ALGO( 608 HAMMER2_COMP_NEWFS_DEFAULT); 609 rawip->meta.check_algo = HAMMER2_ENC_ALGO( 610 HAMMER2_CHECK_XXHASH64); 611 } 612 613 /* 614 * NOTE: We leave nmasters set to 0, which means that we 615 * don't know how many masters there are. The quorum 616 * calculation will effectively be 1 ( 0 / 2 + 1 ). 617 */ 618 rawip->meta.pfs_clid = Hammer2_PfsCLID[i]; 619 rawip->meta.pfs_fsid = Hammer2_PfsFSID[i]; 620 rawip->meta.pfs_type = HAMMER2_PFSTYPE_MASTER; 621 rawip->meta.op_flags |= HAMMER2_OPFLAG_PFSROOT; 622 623 /* first allocatable inode number */ 624 rawip->meta.pfs_inum = 16; 625 626 /* rawip->u.blockset is left empty */ 627 628 /* 629 * The root blockref will be stored in the super-root inode as 630 * the only directory entry. The copyid here is the actual 631 * copyid of the storage ref. 632 * 633 * The key field for a directory entry's blockref is 634 * essentially the name key for the entry. 635 */ 636 root_blockref[i].key = rawip->meta.name_key; 637 root_blockref[i].copyid = HAMMER2_COPYID_LOCAL; 638 root_blockref[i].keybits = 0; 639 root_blockref[i].check.xxhash64.value = 640 XXH64(rawip, sizeof(*rawip), XXH_HAMMER2_SEED); 641 root_blockref[i].type = HAMMER2_BREF_TYPE_INODE; 642 root_blockref[i].methods = 643 HAMMER2_ENC_CHECK(HAMMER2_CHECK_XXHASH64) | 644 HAMMER2_ENC_COMP(HAMMER2_COMP_NONE); 645 root_blockref[i].mirror_tid = 16; 646 root_blockref[i].flags = HAMMER2_BREF_FLAG_PFSROOT; 647 } 648 649 /* 650 * Format the super-root directory inode, giving it one directory 651 * entry (root_blockref) and fixup the icrc method. 652 * 653 * The superroot contains one directory entry pointing at the root 654 * inode (named via the label). Inodes contain one blockset which 655 * is fully associative so we can put the entry anywhere without 656 * having to worry about the hash. Use index 0. 657 */ 658 rawip = (void *)(buf + (HAMMER2_OFF_MASK_LO & sroot_blockref.data_off)); 659 rawip->meta.version = HAMMER2_INODE_VERSION_ONE; 660 rawip->meta.ctime = now; 661 rawip->meta.mtime = now; 662 /* rawip->meta.atime = now; NOT IMPL MUST BE ZERO */ 663 rawip->meta.btime = now; 664 rawip->meta.type = HAMMER2_OBJTYPE_DIRECTORY; 665 rawip->meta.mode = 0700; /* super-root - root only */ 666 rawip->meta.inum = 0; /* super root inode, inumber 0 */ 667 rawip->meta.nlinks = 2; /* directory link count compat */ 668 669 rawip->meta.name_len = 0; /* super-root is unnamed */ 670 rawip->meta.name_key = 0; 671 672 rawip->meta.comp_algo = HAMMER2_ENC_ALGO(HAMMER2_COMP_AUTOZERO); 673 rawip->meta.check_algo = HAMMER2_ENC_ALGO(HAMMER2_CHECK_XXHASH64); 674 675 /* 676 * The super-root is flagged as a PFS and typically given its own 677 * random FSID, making it possible to mirror an entire HAMMER2 disk 678 * snapshots and all if desired. PFS ids are used to match up 679 * mirror sources and targets and cluster copy sources and targets. 680 * 681 * (XXX whole-disk logical mirroring is not really supported in 682 * the first attempt because each PFS is in its own modify/mirror 683 * transaction id domain, so normal mechanics cannot cross a PFS 684 * boundary). 685 */ 686 rawip->meta.pfs_clid = Hammer2_SupCLID; 687 rawip->meta.pfs_fsid = Hammer2_SupFSID; 688 rawip->meta.pfs_type = HAMMER2_PFSTYPE_SUPROOT; 689 snprintf((char*)rawip->filename, sizeof(rawip->filename), "SUPROOT"); 690 rawip->meta.name_key = 0; 691 rawip->meta.name_len = strlen((char*)rawip->filename); 692 693 /* The super-root has an inode number of 0 */ 694 rawip->meta.pfs_inum = 0; 695 696 /* 697 * Currently newfs_hammer2 just throws the PFS inodes into the 698 * top-level block table at the volume root and doesn't try to 699 * create an indirect block, so we are limited to ~4 at filesystem 700 * creation time. More can be added after mounting. 701 */ 702 qsort(root_blockref, NLabels, sizeof(root_blockref[0]), blkrefary_cmp); 703 for (i = 0; i < NLabels; ++i) 704 rawip->u.blockset.blockref[i] = root_blockref[i]; 705 706 /* 707 * The sroot blockref will be stored in the volume header. 708 */ 709 sroot_blockref.copyid = HAMMER2_COPYID_LOCAL; 710 sroot_blockref.keybits = 0; 711 sroot_blockref.check.xxhash64.value = 712 XXH64(rawip, sizeof(*rawip), XXH_HAMMER2_SEED); 713 sroot_blockref.type = HAMMER2_BREF_TYPE_INODE; 714 sroot_blockref.methods = HAMMER2_ENC_CHECK(HAMMER2_CHECK_XXHASH64) | 715 HAMMER2_ENC_COMP(HAMMER2_COMP_AUTOZERO); 716 sroot_blockref.mirror_tid = 16; 717 rawip = NULL; 718 719 /* 720 * Write out the 64K HAMMER2 block containing the root and sroot. 721 */ 722 n = pwrite(fd, buf, HAMMER2_PBUFSIZE, 723 sroot_blockref.data_off & HAMMER2_OFF_MASK_HI); 724 if (n != HAMMER2_PBUFSIZE) { 725 perror("write"); 726 exit(1); 727 } 728 729 /* 730 * Format the volume header. 731 * 732 * The volume header points to sroot_blockref. Also be absolutely 733 * sure that allocator_beg is set. 734 */ 735 bzero(buf, HAMMER2_PBUFSIZE); 736 vol = (void *)buf; 737 738 vol->magic = HAMMER2_VOLUME_ID_HBO; 739 vol->boot_beg = boot_base; 740 vol->boot_end = boot_base + BootAreaSize; 741 vol->aux_beg = aux_base; 742 vol->aux_end = aux_base + AuxAreaSize; 743 vol->volu_size = total_space; 744 vol->version = Hammer2Version; 745 vol->flags = 0; 746 747 vol->fsid = Hammer2_VolFSID; 748 vol->fstype = Hammer2_FSType; 749 750 vol->peer_type = DMSG_PEER_HAMMER2; /* LNK_CONN identification */ 751 752 vol->allocator_size = free_space; 753 vol->allocator_free = free_space; 754 vol->allocator_beg = alloc_base; 755 756 vol->sroot_blockset.blockref[0] = sroot_blockref; 757 vol->mirror_tid = 16; /* all blockref mirror TIDs set to 16 */ 758 vol->freemap_tid = 16; /* all blockref mirror TIDs set to 16 */ 759 vol->icrc_sects[HAMMER2_VOL_ICRC_SECT1] = 760 hammer2_icrc32((char *)vol + HAMMER2_VOLUME_ICRC1_OFF, 761 HAMMER2_VOLUME_ICRC1_SIZE); 762 763 /* 764 * Set ICRC_SECT0 after all remaining elements of sect0 have been 765 * populated in the volume header. Note hat ICRC_SECT* (except for 766 * SECT0) are part of sect0. 767 */ 768 vol->icrc_sects[HAMMER2_VOL_ICRC_SECT0] = 769 hammer2_icrc32((char *)vol + HAMMER2_VOLUME_ICRC0_OFF, 770 HAMMER2_VOLUME_ICRC0_SIZE); 771 vol->icrc_volheader = 772 hammer2_icrc32((char *)vol + HAMMER2_VOLUME_ICRCVH_OFF, 773 HAMMER2_VOLUME_ICRCVH_SIZE); 774 775 /* 776 * Write the volume header and all alternates. 777 */ 778 for (i = 0; i < HAMMER2_NUM_VOLHDRS; ++i) { 779 if (i * HAMMER2_ZONE_BYTES64 >= total_space) 780 break; 781 n = pwrite(fd, buf, HAMMER2_PBUFSIZE, 782 volu_base + i * HAMMER2_ZONE_BYTES64); 783 if (n != HAMMER2_PBUFSIZE) { 784 perror("write"); 785 exit(1); 786 } 787 } 788 789 /* 790 * Cleanup 791 */ 792 free(buf); 793 } 794 795 static void 796 alloc_direct(hammer2_off_t *basep, hammer2_blockref_t *bref, size_t bytes) 797 { 798 int radix; 799 800 radix = 0; 801 assert(bytes); 802 while ((bytes & 1) == 0) { 803 bytes >>= 1; 804 ++radix; 805 } 806 assert(bytes == 1); 807 if (radix < HAMMER2_RADIX_MIN) 808 radix = HAMMER2_RADIX_MIN; 809 810 bzero(bref, sizeof(*bref)); 811 bref->data_off = *basep | radix; 812 bref->vradix = radix; 813 814 *basep += 1U << radix; 815 } 816 817 /* 818 * Borrow HAMMER1's directory hash algorithm #1 with a few modifications. 819 * The filename is split into fields which are hashed separately and then 820 * added together. 821 * 822 * Differences include: bit 63 must be set to 1 for HAMMER2 (HAMMER1 sets 823 * it to 0), this is because bit63=0 is used for hidden hardlinked inodes. 824 * (This means we do not need to do a 0-check/or-with-0x100000000 either). 825 * 826 * Also, the iscsi crc code is used instead of the old crc32 code. 827 */ 828 static hammer2_key_t 829 dirhash(const unsigned char *name, size_t len) 830 { 831 const unsigned char *aname = name; 832 uint32_t crcx; 833 uint64_t key; 834 size_t i; 835 size_t j; 836 837 /* 838 * Filesystem version 6 or better will create directories 839 * using the ALG1 dirhash. This hash breaks the filename 840 * up into domains separated by special characters and 841 * hashes each domain independently. 842 * 843 * We also do a simple sub-sort using the first character 844 * of the filename in the top 5-bits. 845 */ 846 key = 0; 847 848 /* 849 * m32 850 */ 851 crcx = 0; 852 for (i = j = 0; i < len; ++i) { 853 if (aname[i] == '.' || 854 aname[i] == '-' || 855 aname[i] == '_' || 856 aname[i] == '~') { 857 if (i != j) 858 crcx += hammer2_icrc32(aname + j, i - j); 859 j = i + 1; 860 } 861 } 862 if (i != j) 863 crcx += hammer2_icrc32(aname + j, i - j); 864 865 /* 866 * The directory hash utilizes the top 32 bits of the 64-bit key. 867 * Bit 63 must be set to 1. 868 */ 869 crcx |= 0x80000000U; 870 key |= (uint64_t)crcx << 32; 871 872 /* 873 * l16 - crc of entire filename 874 * 875 * This crc reduces degenerate hash collision conditions 876 */ 877 crcx = hammer2_icrc32(aname, len); 878 crcx = crcx ^ (crcx << 16); 879 key |= crcx & 0xFFFF0000U; 880 881 /* 882 * Set bit 15. This allows readdir to strip bit 63 so a positive 883 * 64-bit cookie/offset can always be returned, and still guarantee 884 * that the values 0x0000-0x7FFF are available for artificial entries. 885 * ('.' and '..'). 886 */ 887 key |= 0x8000U; 888 889 return (key); 890 } 891 892 static int 893 blkrefary_cmp(const void *b1, const void *b2) 894 { 895 const hammer2_blockref_t *bref1 = b1; 896 const hammer2_blockref_t *bref2 = b2; 897 if (bref1->key < bref2->key) 898 return(-1); 899 if (bref1->key > bref2->key) 900 return(1); 901 return 0; 902 } 903