1 /* 2 * Copyright (c) 2011-2012 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 * by Venkatesh Srinivas <vsrinivas@dragonflybsd.org> 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the 17 * distribution. 18 * 3. Neither the name of The DragonFly Project nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific, prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 26 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 #ifndef VFS_HAMMER2_DISK_H_ 36 #define VFS_HAMMER2_DISK_H_ 37 38 #ifndef _SYS_UUID_H_ 39 #include <sys/uuid.h> 40 #endif 41 #ifndef _SYS_DMSG_H_ 42 #include <sys/dmsg.h> 43 #endif 44 45 /* 46 * The structures below represent the on-disk media structures for the HAMMER2 47 * filesystem. Note that all fields for on-disk structures are naturally 48 * aligned. The host endian format is typically used - compatibility is 49 * possible if the implementation detects reversed endian and adjusts accesses 50 * accordingly. 51 * 52 * HAMMER2 primarily revolves around the directory topology: inodes, 53 * directory entries, and block tables. Block device buffer cache buffers 54 * are always 64KB. Logical file buffers are typically 16KB. All data 55 * references utilize 64-bit byte offsets. 56 * 57 * Free block management is handled independently using blocks reserved by 58 * the media topology. 59 */ 60 61 /* 62 * The data at the end of a file or directory may be a fragment in order 63 * to optimize storage efficiency. The minimum fragment size is 1KB. 64 * Since allocations are in powers of 2 fragments must also be sized in 65 * powers of 2 (1024, 2048, ... 65536). 66 * 67 * For the moment the maximum allocation size is HAMMER2_PBUFSIZE (64K), 68 * which is 2^16. Larger extents may be supported in the future. Smaller 69 * fragments might be supported in the future (down to 64 bytes is possible), 70 * but probably will not be. 71 * 72 * A full indirect block use supports 1024 x 64-byte blockrefs in a 64KB 73 * buffer. Indirect blocks down to 1KB are supported to keep small 74 * directories small. 75 * 76 * A maximally sized file (2^64-1 bytes) requires 5 indirect block levels. 77 * The hammer2_blockset in the volume header or file inode has another 8 78 * entries, giving us 66+3 = 69 bits of address space. However, some bits 79 * are taken up by (potentially) requests for redundant copies. HAMMER2 80 * currently supports up to 8 copies, which brings the address space down 81 * to 66 bits and gives us 2 bits of leeway. 82 */ 83 #define HAMMER2_MIN_ALLOC 1024 /* minimum allocation size */ 84 #define HAMMER2_MIN_RADIX 10 /* minimum allocation size 2^N */ 85 #define HAMMER2_MAX_RADIX 16 /* maximum allocation size 2^N */ 86 #define HAMMER2_KEY_RADIX 64 /* number of bits in key */ 87 88 /* 89 * MINALLOCSIZE - The minimum allocation size. This can be smaller 90 * or larger than the minimum physical IO size. 91 * 92 * NOTE: Should not be larger than 1K since inodes 93 * are 1K. 94 * 95 * MINIOSIZE - The minimum IO size. This must be less than 96 * or equal to HAMMER2_PBUFSIZE. 97 * 98 * XXX currently must be set to MINALLOCSIZE until/if 99 * we deal with recursive buffer cache locks. 100 * 101 * HAMMER2_PBUFSIZE - Topological block size used by files for all 102 * blocks except the block straddling EOF. 103 * 104 * HAMMER2_SEGSIZE - Allocation map segment size, typically 2MB 105 */ 106 107 #define HAMMER2_SEGSIZE (65536 * 8) 108 109 #define HAMMER2_PBUFRADIX 16 /* physical buf (1<<16) bytes */ 110 #define HAMMER2_PBUFSIZE 65536 111 #define HAMMER2_LBUFRADIX 14 /* logical buf (1<<14) bytes */ 112 #define HAMMER2_LBUFSIZE 16384 113 114 #if 0 115 #define HAMMER2_MINIORADIX 16 /* minimum phsical IO size */ 116 #define HAMMER2_MINIOSIZE 65536 117 #endif 118 #define HAMMER2_MINIORADIX HAMMER2_MINALLOCRADIX 119 #define HAMMER2_MINIOSIZE HAMMER2_MINALLOCSIZE 120 121 #define HAMMER2_MINALLOCRADIX 10 /* minimum block allocation size */ 122 #define HAMMER2_MINALLOCSIZE 1024 123 #define HAMMER2_IND_BYTES_MIN 4096 /* first indirect layer only */ 124 #define HAMMER2_IND_BYTES_MAX HAMMER2_PBUFSIZE 125 #define HAMMER2_IND_COUNT_MIN (HAMMER2_IND_BYTES_MIN / \ 126 sizeof(hammer2_blockref_t)) 127 #define HAMMER2_IND_COUNT_MAX (HAMMER2_IND_BYTES_MAX / \ 128 sizeof(hammer2_blockref_t)) 129 130 /* 131 * In HAMMER2, arrays of blockrefs are fully set-associative, meaning that 132 * any element can occur at any index and holes can be anywhere. As a 133 * future optimization we will be able to flag that such arrays are sorted 134 * and thus optimize lookups, but for now we don't. 135 * 136 * Inodes embed either 512 bytes of direct data or an array of 8 blockrefs, 137 * resulting in highly efficient storage for files <= 512 bytes and for files 138 * <= 512KB. Up to 8 directory entries can be referenced from a directory 139 * without requiring an indirect block. 140 * 141 * Indirect blocks are typically either 4KB (64 blockrefs / ~4MB represented), 142 * or 64KB (1024 blockrefs / ~64MB represented). 143 */ 144 #define HAMMER2_SET_COUNT 8 /* direct entries */ 145 #define HAMMER2_SET_RADIX 3 146 #define HAMMER2_EMBEDDED_BYTES 512 147 #define HAMMER2_EMBEDDED_RADIX 9 148 149 #define HAMMER2_PBUFMASK (HAMMER2_PBUFSIZE - 1) 150 #define HAMMER2_LBUFMASK (HAMMER2_LBUFSIZE - 1) 151 #define HAMMER2_SEGMASK (HAMMER2_SEGSIZE - 1) 152 153 #define HAMMER2_LBUFMASK64 ((hammer2_off_t)HAMMER2_LBUFMASK) 154 #define HAMMER2_PBUFSIZE64 ((hammer2_off_t)HAMMER2_PBUFSIZE) 155 #define HAMMER2_PBUFMASK64 ((hammer2_off_t)HAMMER2_PBUFMASK) 156 #define HAMMER2_SEGSIZE64 ((hammer2_off_t)HAMMER2_SEGSIZE) 157 #define HAMMER2_SEGMASK64 ((hammer2_off_t)HAMMER2_SEGMASK) 158 159 #define HAMMER2_UUID_STRING "5cbb9ad1-862d-11dc-a94d-01301bb8a9f5" 160 161 /* 162 * A HAMMER2 filesystem is always sized in multiples of 8MB. 163 * 164 * A 4MB segment is reserved at the beginning of each 2GB zone. This segment 165 * contains the volume header (or backup volume header), the free block 166 * table, and possibly other information in the future. 167 * 168 * 4MB = 64 x 64K blocks. Each 4MB segment is broken down as follows: 169 * 170 * +-----------------------+ 171 * | Volume Hdr | block 0 volume header & alternates 172 * +-----------------------+ (first four zones only) 173 * | (A) FreeBlk layer0 | block 1 free block table 174 * | (A) FreeBlk layer1 | 175 * | (A) FreeBlk layer2 | 176 * | (A) FreeBlk layer3 | 177 * | (A) FreeBlk layer4[8] | (note: 8x64K -> 128x4K) 178 * +-----------------------+ 179 * | (B) FreeBlk layer0 | block 13 free block table 180 * | (B) FreeBlk layer1 | 181 * | (B) FreeBlk layer2 | 182 * | (B) FreeBlk layer3 | 183 * | (B) FreeBlk layer4[8] | 184 * +-----------------------+ 185 * | (C) FreeBlk layer0 | block 25 free block table 186 * | (C) FreeBlk layer1 | 187 * | (C) FreeBlk layer2 | 188 * | (C) FreeBlk layer3 | 189 * | (C) FreeBlk layer4[8] | 190 * +-----------------------+ 191 * | (D) FreeBlk layer0 | block 37 free block table 192 * | (D) FreeBlk layer1 | 193 * | (D) FreeBlk layer2 | 194 * | (D) FreeBlk layer3 | 195 * | (D) FreeBlk layer4[8] | 196 * +-----------------------+ 197 * | | block 49...63 198 * | reserved | 199 * | | 200 * +-----------------------+ 201 * 202 * The first few 2GB zones contain volume headers and volume header backups. 203 * After that the volume header block# is reserved. The first 2GB zone 204 * contains all four FreeBlk layers, for example, but the layer1 FreeBlk 205 * is only needed once every 1TB. The free block topology rotates between 206 * several groups {A,B,C,D} in order to ensure that the free block table 207 * is clean upon reboot after a crash or disk failure. 208 * 209 * The Free block table has a resolution of 1KB 210 */ 211 #define HAMMER2_VOLUME_ALIGN (8 * 1024 * 1024) 212 #define HAMMER2_VOLUME_ALIGN64 ((hammer2_off_t)HAMMER2_VOLUME_ALIGN) 213 #define HAMMER2_VOLUME_ALIGNMASK (HAMMER2_VOLUME_ALIGN - 1) 214 #define HAMMER2_VOLUME_ALIGNMASK64 ((hammer2_off_t)HAMMER2_VOLUME_ALIGNMASK) 215 216 #define HAMMER2_NEWFS_ALIGN (HAMMER2_VOLUME_ALIGN) 217 #define HAMMER2_NEWFS_ALIGN64 ((hammer2_off_t)HAMMER2_VOLUME_ALIGN) 218 #define HAMMER2_NEWFS_ALIGNMASK (HAMMER2_VOLUME_ALIGN - 1) 219 #define HAMMER2_NEWFS_ALIGNMASK64 ((hammer2_off_t)HAMMER2_NEWFS_ALIGNMASK) 220 221 #define HAMMER2_ZONE_BYTES64 (2LLU * 1024 * 1024 * 1024) 222 #define HAMMER2_ZONE_MASK64 (HAMMER2_ZONE_BYTES64 - 1) 223 #define HAMMER2_ZONE_SEG (4 * 1024 * 1024) 224 #define HAMMER2_ZONE_SEG64 ((hammer2_off_t)HAMMER2_ZONE_SEG) 225 #define HAMMER2_ZONE_BLOCKS_SEG (HAMMER2_ZONE_SEG / HAMMER2_PBUFSIZE) 226 227 /* 228 * 64 x 64KB blocks are reserved at the base of each 2GB zone. These blocks 229 * are used to store the volume header or volume header backups, allocation 230 * tree, and other information in the future. 231 * 232 * All specified blocks are not necessarily used in all 2GB zones. However, 233 * dead areas are reserved and MUST NOT BE USED for other purposes. 234 * 235 * The freemap is arranged into four groups. Modifications rotate through 236 * the groups on a block by block basis (so all the blocks are not necessarily 237 * synchronized to the same group). Only three groups are actually necessary 238 * (stable, flushing, modifying). 239 * 240 * 64KB freemap indirect blocks are represented by layers 0, 1, 2, and 3. 241 * 4KB freemap leaf blocks each represent 16MB of storage so 128 x 4KB are 242 * needed per zone, which equates to 8 x 64KB layer4 blocks per zone. 243 */ 244 #define HAMMER2_ZONE_VOLHDR 0 /* volume header or backup */ 245 #define HAMMER2_ZONE_FREEMAP_A 1 /* freemap layer group A */ 246 #define HAMMER2_ZONE_FREEMAP_B 13 /* freemap layer group B */ 247 #define HAMMER2_ZONE_FREEMAP_C 25 /* freemap layer group C */ 248 #define HAMMER2_ZONE_FREEMAP_D 37 /* freemap layer group D */ 249 250 #define HAMMER2_ZONEFM_LAYER0 0 /* relative to FREEMAP_x */ 251 #define HAMMER2_ZONEFM_LAYER1 1 252 #define HAMMER2_ZONEFM_LAYER2 2 253 #define HAMMER2_ZONEFM_LAYER3 3 254 #define HAMMER2_ZONEFM_LAYER4 4 /* 4-11 (8 64KB blocks) */ 255 256 #define HAMMER2_ZONE_BLOCK49 49 /* future */ 257 #define HAMMER2_ZONE_BLOCK50 50 /* future */ 258 #define HAMMER2_ZONE_BLOCK51 51 /* future */ 259 #define HAMMER2_ZONE_BLOCK52 52 /* future */ 260 #define HAMMER2_ZONE_BLOCK53 53 /* future */ 261 #define HAMMER2_ZONE_BLOCK54 54 /* future */ 262 #define HAMMER2_ZONE_BLOCK55 55 /* future */ 263 #define HAMMER2_ZONE_BLOCK56 56 /* future */ 264 #define HAMMER2_ZONE_BLOCK57 57 /* future */ 265 #define HAMMER2_ZONE_BLOCK58 58 /* future */ 266 #define HAMMER2_ZONE_BLOCK59 59 /* future */ 267 268 #define HAMMER2_ZONE_BLOCK60 60 /* future */ 269 #define HAMMER2_ZONE_BLOCK61 61 /* future */ 270 #define HAMMER2_ZONE_BLOCK62 62 /* future */ 271 #define HAMMER2_ZONE_BLOCK63 63 /* future */ 272 273 /* 274 * Two linear areas can be reserved after the initial 2MB segment in the base 275 * zone (the one starting at offset 0). These areas are NOT managed by the 276 * block allocator and do not fall under HAMMER2 crc checking rules based 277 * at the volume header (but can be self-CRCd internally, depending). 278 */ 279 #define HAMMER2_BOOT_MIN_BYTES HAMMER2_VOLUME_ALIGN 280 #define HAMMER2_BOOT_NOM_BYTES (64*1024*1024) 281 #define HAMMER2_BOOT_MAX_BYTES (256*1024*1024) 282 283 #define HAMMER2_REDO_MIN_BYTES HAMMER2_VOLUME_ALIGN 284 #define HAMMER2_REDO_NOM_BYTES (256*1024*1024) 285 #define HAMMER2_REDO_MAX_BYTES (1024*1024*1024) 286 287 /* 288 * Most HAMMER2 types are implemented as unsigned 64-bit integers. 289 * Transaction ids are monotonic. 290 * 291 * We utilize 32-bit iSCSI CRCs. 292 */ 293 typedef uint64_t hammer2_tid_t; 294 typedef uint64_t hammer2_off_t; 295 typedef uint64_t hammer2_key_t; 296 typedef uint32_t hammer2_crc32_t; 297 298 /* 299 * Miscellanious ranges (all are unsigned). 300 */ 301 #define HAMMER2_MIN_TID 1ULL 302 #define HAMMER2_MAX_TID 0xFFFFFFFFFFFFFFFFULL 303 #define HAMMER2_MIN_KEY 0ULL 304 #define HAMMER2_MAX_KEY 0xFFFFFFFFFFFFFFFFULL 305 #define HAMMER2_MIN_OFFSET 0ULL 306 #define HAMMER2_MAX_OFFSET 0xFFFFFFFFFFFFFFFFULL 307 308 /* 309 * HAMMER2 data offset special cases and masking. 310 * 311 * All HAMMER2 data offsets have to be broken down into a 64K buffer base 312 * offset (HAMMER2_OFF_MASK_HI) and a 64K buffer index (HAMMER2_OFF_MASK_LO). 313 * 314 * Indexes into physical buffers are always 64-byte aligned. The low 6 bits 315 * of the data offset field specifies how large the data chunk being pointed 316 * to as a power of 2. The theoretical minimum radix is thus 6 (The space 317 * needed in the low bits of the data offset field). However, the practical 318 * minimum allocation chunk size is 1KB (a radix of 10), so HAMMER2 sets 319 * HAMMER2_MIN_RADIX to 10. The maximum radix is currently 16 (64KB), but 320 * we fully intend to support larger extents in the future. 321 */ 322 #define HAMMER2_OFF_BAD ((hammer2_off_t)-1) 323 #define HAMMER2_OFF_MASK 0xFFFFFFFFFFFFFFC0ULL 324 #define HAMMER2_OFF_MASK_LO (HAMMER2_OFF_MASK & HAMMER2_PBUFMASK64) 325 #define HAMMER2_OFF_MASK_HI (~HAMMER2_PBUFMASK64) 326 #define HAMMER2_OFF_MASK_RADIX 0x000000000000003FULL 327 #define HAMMER2_MAX_COPIES 6 328 329 /* 330 * HAMMER2 directory support and pre-defined keys 331 */ 332 #define HAMMER2_DIRHASH_VISIBLE 0x8000000000000000ULL 333 #define HAMMER2_DIRHASH_USERMSK 0x7FFFFFFFFFFFFFFFULL 334 #define HAMMER2_DIRHASH_LOMASK 0x0000000000007FFFULL 335 #define HAMMER2_DIRHASH_HIMASK 0xFFFFFFFFFFFF0000ULL 336 #define HAMMER2_DIRHASH_FORCED 0x0000000000008000ULL /* bit forced on */ 337 338 #define HAMMER2_SROOT_KEY 0x0000000000000000ULL /* volume to sroot */ 339 340 /* 341 * The media block reference structure. This forms the core of the HAMMER2 342 * media topology recursion. This 64-byte data structure is embedded in the 343 * volume header, in inodes (which are also directory entries), and in 344 * indirect blocks. 345 * 346 * A blockref references a single media item, which typically can be a 347 * directory entry (aka inode), indirect block, or data block. 348 * 349 * The primary feature a blockref represents is the ability to validate 350 * the entire tree underneath it via its check code. Any modification to 351 * anything propagates up the blockref tree all the way to the root, replacing 352 * the related blocks. Propagations can shortcut to the volume root to 353 * implement the 'fast syncing' feature but this only delays the eventual 354 * propagation. 355 * 356 * The check code can be a simple 32-bit iscsi code, a 64-bit crc, 357 * or as complex as a 192 bit cryptographic hash. 192 bits is the maximum 358 * supported check code size, which is not sufficient for unverified dedup 359 * UNLESS one doesn't mind once-in-a-blue-moon data corruption (such as when 360 * farming web data). HAMMER2 has an unverified dedup feature for just this 361 * purpose. 362 * 363 * -- 364 * 365 * NOTE: The range of keys represented by the blockref is (key) to 366 * ((key) + (1LL << keybits) - 1). HAMMER2 usually populates 367 * blocks bottom-up, inserting a new root when radix expansion 368 * is required. 369 */ 370 struct hammer2_blockref { /* MUST BE EXACTLY 64 BYTES */ 371 uint8_t type; /* type of underlying item */ 372 uint8_t methods; /* check method & compression method */ 373 uint8_t copyid; /* specify which copy this is */ 374 uint8_t keybits; /* #of keybits masked off 0=leaf */ 375 uint8_t vradix; /* virtual data/meta-data size */ 376 uint8_t flags; /* blockref flags */ 377 uint8_t reserved06; 378 uint8_t reserved07; 379 hammer2_key_t key; /* key specification */ 380 hammer2_tid_t mirror_tid; /* propagate for mirror scan */ 381 hammer2_tid_t modify_tid; /* modifications sans propagation */ 382 hammer2_off_t data_off; /* low 6 bits is phys size (radix)*/ 383 union { /* check info */ 384 char buf[24]; 385 struct { 386 uint32_t value; 387 uint32_t unused[5]; 388 } iscsi32; 389 struct { 390 uint64_t value; 391 uint64_t unused[2]; 392 } crc64; 393 struct { 394 char data[24]; 395 } sha192; 396 397 /* 398 * Freemap hints are embedded in addition to the icrc32. 399 * 400 * biggest - largest possible allocation 2^N within sub-tree. 401 * typically initialized to 64 in freemap_blockref 402 * and to 54 in each blockref[] entry in the 403 * FREEMAP_ROOT indirect block. 404 * 405 * An allocation > 2^N is guaranteed to fail. An 406 * allocation <= 2^N MAY fail, and if it does the 407 * biggest hint will be adjusted downward. 408 * 409 * Used when allocating space. 410 */ 411 struct { 412 uint32_t icrc32; 413 uint8_t biggest; 414 uint8_t reserved05; 415 uint8_t reserved06; 416 uint8_t reserved07; 417 uint64_t avail; /* total available bytes */ 418 uint64_t unused; /* unused must be 0 */ 419 } freemap; 420 } check; 421 }; 422 423 typedef struct hammer2_blockref hammer2_blockref_t; 424 425 #if 0 426 #define HAMMER2_BREF_SYNC1 0x01 /* modification synchronized */ 427 #define HAMMER2_BREF_SYNC2 0x02 /* modification committed */ 428 #define HAMMER2_BREF_DESYNCCHLD 0x04 /* desynchronize children */ 429 #define HAMMER2_BREF_DELETED 0x80 /* indicates a deletion */ 430 #endif 431 432 #define HAMMER2_BLOCKREF_BYTES 64 /* blockref struct in bytes */ 433 434 #define HAMMER2_BREF_TYPE_EMPTY 0 435 #define HAMMER2_BREF_TYPE_INODE 1 436 #define HAMMER2_BREF_TYPE_INDIRECT 2 437 #define HAMMER2_BREF_TYPE_DATA 3 438 #define HAMMER2_BREF_TYPE_FREEMAP_ROOT 4 439 #define HAMMER2_BREF_TYPE_FREEMAP_NODE 5 440 #define HAMMER2_BREF_TYPE_FREEMAP_LEAF 6 441 #define HAMMER2_BREF_TYPE_VOLUME 255 /* pseudo-type */ 442 443 #define HAMMER2_ENC_CHECK(n) ((n) << 4) 444 #define HAMMER2_DEC_CHECK(n) (((n) >> 4) & 15) 445 446 #define HAMMER2_CHECK_NONE 0 447 #define HAMMER2_CHECK_ISCSI32 1 448 #define HAMMER2_CHECK_CRC64 2 449 #define HAMMER2_CHECK_SHA192 3 450 #define HAMMER2_CHECK_FREEMAP 4 451 452 #define HAMMER2_ENC_COMP(n) (n) 453 #define HAMMER2_DEC_COMP(n) ((n) & 15) 454 455 #define HAMMER2_COMP_NONE 0 456 #define HAMMER2_COMP_AUTOZERO 1 457 458 459 /* 460 * HAMMER2 block references are collected into sets of 8 blockrefs. These 461 * sets are fully associative, meaning the elements making up a set are 462 * not sorted in any way and may contain duplicate entries, holes, or 463 * entries which shortcut multiple levels of indirection. Sets are used 464 * in various ways: 465 * 466 * (1) When redundancy is desired a set may contain several duplicate 467 * entries pointing to different copies of the same data. Up to 8 copies 468 * are supported but the set structure becomes a bit inefficient once 469 * you go over 4. 470 * 471 * (2) The blockrefs in a set can shortcut multiple levels of indirections 472 * within the bounds imposed by the parent of set. 473 * 474 * When a set fills up another level of indirection is inserted, moving 475 * some or all of the set's contents into indirect blocks placed under the 476 * set. This is a top-down approach in that indirect blocks are not created 477 * until the set actually becomes full (that is, the entries in the set can 478 * shortcut the indirect blocks when the set is not full). Depending on how 479 * things are filled multiple indirect blocks will eventually be created. 480 * 481 * Indirect blocks are typically 4KB (64 entres) or 64KB (1024 entries) and 482 * are also treated as fully set-associative. 483 */ 484 struct hammer2_blockset { 485 hammer2_blockref_t blockref[HAMMER2_SET_COUNT]; 486 }; 487 488 typedef struct hammer2_blockset hammer2_blockset_t; 489 490 /* 491 * Catch programmer snafus 492 */ 493 #if (1 << HAMMER2_SET_RADIX) != HAMMER2_SET_COUNT 494 #error "hammer2 direct radix is incorrect" 495 #endif 496 #if (1 << HAMMER2_PBUFRADIX) != HAMMER2_PBUFSIZE 497 #error "HAMMER2_PBUFRADIX and HAMMER2_PBUFSIZE are inconsistent" 498 #endif 499 #if (1 << HAMMER2_MIN_RADIX) != HAMMER2_MIN_ALLOC 500 #error "HAMMER2_MIN_RADIX and HAMMER2_MIN_ALLOC are inconsistent" 501 #endif 502 503 /* 504 * The media indirect block structure. 505 */ 506 struct hammer2_indblock_data { 507 hammer2_blockref_t blockref[HAMMER2_IND_COUNT_MAX]; 508 }; 509 510 typedef struct hammer2_indblock_data hammer2_indblock_data_t; 511 512 /* 513 * In HAMMER2 inodes ARE directory entries, with a special exception for 514 * hardlinks. The inode number is stored in the inode rather than being 515 * based on the location of the inode (since the location moves every time 516 * the inode or anything underneath the inode is modified). 517 * 518 * The inode is 1024 bytes, made up of 256 bytes of meta-data, 256 bytes 519 * for the filename, and 512 bytes worth of direct file data OR an embedded 520 * blockset. 521 * 522 * Directories represent one inode per blockref. Inodes are not laid out 523 * as a file but instead are represented by the related blockrefs. The 524 * blockrefs, in turn, are indexed by the 64-bit directory hash key. Remember 525 * that blocksets are fully associative, so a certain degree efficiency is 526 * achieved just from that. 527 * 528 * Up to 512 bytes of direct data can be embedded in an inode, and since 529 * inodes are essentially directory entries this also means that small data 530 * files end up simply being laid out linearly in the directory, resulting 531 * in fewer seeks and highly optimal access. 532 * 533 * The compression mode can be changed at any time in the inode and is 534 * recorded on a blockref-by-blockref basis. 535 * 536 * Hardlinks are supported via the inode map. Essentially the way a hardlink 537 * works is that all individual directory entries representing the same file 538 * are special cased and specify the same inode number. The actual file 539 * is placed in the nearest parent directory that is parent to all instances 540 * of the hardlink. If all hardlinks to a file are in the same directory 541 * the actual file will also be placed in that directory. This file uses 542 * the inode number as the directory entry key and is invisible to normal 543 * directory scans. Real directory entry keys are differentiated from the 544 * inode number key via bit 63. Access to the hardlink silently looks up 545 * the real file and forwards all operations to that file. Removal of the 546 * last hardlink also removes the real file. 547 * 548 * (attr_tid) is only updated when the inode's specific attributes or regular 549 * file size has changed, and affects path lookups and stat. (attr_tid) 550 * represents a special cache coherency lock under the inode. The inode 551 * blockref's modify_tid will always cover it. 552 * 553 * (dirent_tid) is only updated when an entry under a directory inode has 554 * been created, deleted, renamed, or had its attributes change, and affects 555 * directory lookups and scans. (dirent_tid) represents another special cache 556 * coherency lock under the inode. The inode blockref's modify_tid will 557 * always cover it. 558 */ 559 #define HAMMER2_INODE_BYTES 1024 /* (asserted by code) */ 560 #define HAMMER2_INODE_MAXNAME 256 /* maximum name in bytes */ 561 #define HAMMER2_INODE_VERSION_ONE 1 562 563 struct hammer2_inode_data { 564 uint16_t version; /* 0000 inode data version */ 565 uint16_t reserved02; /* 0002 */ 566 567 /* 568 * core inode attributes, inode type, misc flags 569 */ 570 uint32_t uflags; /* 0004 chflags */ 571 uint32_t rmajor; /* 0008 available for device nodes */ 572 uint32_t rminor; /* 000C available for device nodes */ 573 uint64_t ctime; /* 0010 inode change time */ 574 uint64_t mtime; /* 0018 modified time */ 575 uint64_t atime; /* 0020 access time (unsupported) */ 576 uint64_t btime; /* 0028 birth time */ 577 uuid_t uid; /* 0030 uid / degenerate unix uid */ 578 uuid_t gid; /* 0040 gid / degenerate unix gid */ 579 580 uint8_t type; /* 0050 object type */ 581 uint8_t op_flags; /* 0051 operational flags */ 582 uint16_t cap_flags; /* 0052 capability flags */ 583 uint32_t mode; /* 0054 unix modes (typ low 16 bits) */ 584 585 /* 586 * inode size, identification, localized recursive configuration 587 * for compression and backup copies. 588 */ 589 hammer2_tid_t inum; /* 0058 inode number */ 590 hammer2_off_t size; /* 0060 size of file */ 591 uint64_t nlinks; /* 0068 hard links (typ only dirs) */ 592 hammer2_tid_t iparent; /* 0070 parent inum (recovery only) */ 593 hammer2_key_t name_key; /* 0078 full filename key */ 594 uint16_t name_len; /* 0080 filename length */ 595 uint8_t ncopies; /* 0082 ncopies to local media */ 596 uint8_t comp_algo; /* 0083 compression request & algo */ 597 598 /* 599 * These fields are currently only applicable to PFSROOTs. 600 * 601 * NOTE: We can't use {volume_data->fsid, pfs_clid} to uniquely 602 * identify an instance of a PFS in the cluster because 603 * a mount may contain more than one copy of the PFS as 604 * a separate node. {pfs_clid, pfs_fsid} must be used for 605 * registration in the cluster. 606 */ 607 uint8_t target_type; /* 0084 hardlink target type */ 608 uint8_t reserved85; /* 0085 */ 609 uint8_t reserved86; /* 0086 */ 610 uint8_t pfs_type; /* 0087 (if PFSROOT) node type */ 611 uint64_t pfs_inum; /* 0088 (if PFSROOT) inum allocator */ 612 uuid_t pfs_clid; /* 0090 (if PFSROOT) cluster uuid */ 613 uuid_t pfs_fsid; /* 00A0 (if PFSROOT) unique uuid */ 614 615 /* 616 * Quotas and cumulative sub-tree counters. 617 */ 618 hammer2_off_t data_quota; /* 00B0 subtree quota in bytes */ 619 hammer2_off_t data_count; /* 00B8 subtree byte count */ 620 hammer2_off_t inode_quota; /* 00C0 subtree quota inode count */ 621 hammer2_off_t inode_count; /* 00C8 subtree inode count */ 622 hammer2_tid_t attr_tid; /* 00D0 attributes changed */ 623 hammer2_tid_t dirent_tid; /* 00D8 directory/attr changed */ 624 uint64_t reservedE0; /* 00E0 */ 625 uint64_t reservedE8; /* 00E8 */ 626 uint64_t reservedF0; /* 00F0 */ 627 uint64_t reservedF8; /* 00F8 */ 628 629 unsigned char filename[HAMMER2_INODE_MAXNAME]; 630 /* 0100-01FF (256 char, unterminated) */ 631 union { /* 0200-03FF (64x8 = 512 bytes) */ 632 struct hammer2_blockset blockset; 633 char data[HAMMER2_EMBEDDED_BYTES]; 634 } u; 635 }; 636 637 typedef struct hammer2_inode_data hammer2_inode_data_t; 638 639 #define HAMMER2_OPFLAG_DIRECTDATA 0x01 640 #define HAMMER2_OPFLAG_PFSROOT 0x02 641 #define HAMMER2_OPFLAG_COPYIDS 0x04 /* copyids override parent */ 642 643 #define HAMMER2_OBJTYPE_UNKNOWN 0 644 #define HAMMER2_OBJTYPE_DIRECTORY 1 645 #define HAMMER2_OBJTYPE_REGFILE 2 646 #define HAMMER2_OBJTYPE_FIFO 4 647 #define HAMMER2_OBJTYPE_CDEV 5 648 #define HAMMER2_OBJTYPE_BDEV 6 649 #define HAMMER2_OBJTYPE_SOFTLINK 7 650 #define HAMMER2_OBJTYPE_HARDLINK 8 /* dummy entry for hardlink */ 651 #define HAMMER2_OBJTYPE_SOCKET 9 652 #define HAMMER2_OBJTYPE_WHITEOUT 10 653 654 #define HAMMER2_COPYID_NONE 0 655 #define HAMMER2_COPYID_LOCAL ((uint8_t)-1) 656 657 /* 658 * PEER types identify connections and help cluster controller filter 659 * out unwanted SPANs. 660 */ 661 #define HAMMER2_PEER_NONE DMSG_PEER_NONE 662 #define HAMMER2_PEER_CLUSTER DMSG_PEER_CLUSTER 663 #define HAMMER2_PEER_BLOCK DMSG_PEER_BLOCK 664 #define HAMMER2_PEER_HAMMER2 DMSG_PEER_HAMMER2 665 666 #define HAMMER2_COPYID_COUNT DMSG_COPYID_COUNT 667 668 /* 669 * PFS types identify a PFS on media and in LNK_SPAN messages. 670 */ 671 #define HAMMER2_PFSTYPE_NONE DMSG_PFSTYPE_NONE 672 #define HAMMER2_PFSTYPE_ADMIN DMSG_PFSTYPE_ADMIN 673 #define HAMMER2_PFSTYPE_CLIENT DMSG_PFSTYPE_CLIENT 674 #define HAMMER2_PFSTYPE_CACHE DMSG_PFSTYPE_CACHE 675 #define HAMMER2_PFSTYPE_COPY DMSG_PFSTYPE_COPY 676 #define HAMMER2_PFSTYPE_SLAVE DMSG_PFSTYPE_SLAVE 677 #define HAMMER2_PFSTYPE_SOFT_SLAVE DMSG_PFSTYPE_SOFT_SLAVE 678 #define HAMMER2_PFSTYPE_SOFT_MASTER DMSG_PFSTYPE_SOFT_MASTER 679 #define HAMMER2_PFSTYPE_MASTER DMSG_PFSTYPE_MASTER 680 #define HAMMER2_PFSTYPE_MAX DMSG_PFSTYPE_MAX 681 682 /* 683 * Allocation Table 684 * 685 * In HAMMER2 the allocation table hangs off of the volume header and 686 * utilizes somewhat customized hammer2_blockref based indirect blocks 687 * until hitting the leaf bitmap. BREF_TYPE_FREEMAP_ROOT and 688 * BREF_TYPE_FREEMAP_NODE represent the indirect blocks but are formatted 689 * the same as BREF_TYPE_INDIRECT except for the (biggest) and (avail) 690 * fields which use some of the check union space. Thus a special CHECK 691 * id (CHECK_FREEMAP instead of CHECK_ISCSI32) is also specified for these 692 * babies. 693 * 694 * newfs_hammer2 builds the FREEMAP_ROOT block and assigns a radix of 695 * 34, 44, 54, or 64 depending on whether the freemap is to be fitted 696 * to the storage or is to maximized for (possibly) sparse storage. 697 * Other keybits specifications for FREEMAP_ROOT are illegal. Even fitted 698 * storage is required to specify at least a keybits value of 34. 699 * 700 * Total possible representation is 2^64 (16 Exabytes). 701 * 10: 1024 entries / 64KB 16EB (16PB per entry) layer0 702 * 10: 1024 entries / 64KB 16PB (16TB per entry) layer1 703 * 10: 1024 entries / 64KB 16TB (16GB per entry) layer2 704 * 10: 1024 entries / 64KB 16GB (16MB per entry) layer3 705 * 24: 16384 x 1KB allocgran / 4KB 16MB layer4 706 * 707 * To make the radix come out to exactly 64 the leaf bitmaps are arranged 708 * into 4KB buffers, with each buffer representing a freemap for 16MB worth 709 * of storage using a 1KB allocation granularity. The leaf bitmaps are 710 * structures and not just a plain bitmap, hence the extra space needed to 711 * represent 16384 x 1KB blocks. 712 * 713 * The reserved area at the beginning of each 2GB zone is marked as being 714 * allocated on-the-fly and does not have to be pre-set in the freemap, 715 * which is just as well as that would require newfs_hammer2 to do a lot 716 * of writing otherwise. 717 * 718 * Indirect blocks are usually created with a semi-dynamic radix but in the 719 * case of freemap-related indirect blocks, the blocks use a static radix 720 * tree with associations to specific reserved blocks. 721 */ 722 723 /* 724 * 4KB -> hammer2_freemap_elm[256] 725 * 726 * bitmap - 64 bits x 1KB representing 64KB. A '1' bit represents 727 * an allocated block. 728 * 729 * generation - Incremented upon any allocation. Can't increment more 730 * than +64 per background freeing pass due to there being 731 * only 64 bits. 732 * 733 * biggest0 - biggest hint (radix) for freemap_elm. Represents up to 734 * 64KB (radix 16). 735 * 736 * biggest1 - biggest hint (radix) for aligned groups of 16 elements, 737 * stored in elm[0], elm[16], etc. Represents up to 1MB. 738 * (radix 20) 739 * 740 * biggest2 - biggest hint (radix) for aligned groups of 256 elements 741 * (i.e. the whole array, only used by elm[0]). 742 * Represents up to 16MB (radix 24). 743 * 744 * The hinting is used as part of the allocation mechanism to reduce scan 745 * time, which is particularly important as a filesystem approaches full. 746 * Fill ratios are handled at the indirect block level (in the blockrefs) and 747 * not here. 748 */ 749 struct hammer2_freemap_elm { 750 uint64_t bitmap; 751 uint8_t generation; 752 uint8_t biggest0; 753 uint8_t biggest1; 754 uint8_t biggest2; 755 uint32_t reserved0C; 756 }; 757 758 typedef struct hammer2_freemap_elm hammer2_freemap_elm_t; 759 760 #define HAMMER2_FREEMAP_LEAF_BYTES 4096 761 #define HAMMER2_FREEMAP_LEAF_ENTRIES (HAMMER2_FREEMAP_LEAF_BYTES / \ 762 sizeof(hammer2_freemap_elm_t)) 763 #define HAMMER2_FREEMAP_LEAF_RADIX 24 764 #define HAMMER2_FREEMAP_NODE_RADIX 10 765 #define HAMMER2_FREEMAP_ELM_RADIX 5 /* 2^5 == 32 bits */ 766 767 #define HAMMER2_BIGF_KILLED 0x80 768 769 /* 770 * Flags (8 bits) - blockref, for freemap only 771 * 772 * Note that the minimum chunk size is 1KB so we could theoretically have 773 * 10 bits here, but we might have some future extension that allows a 774 * chunk size down to 256 bytes and if so we will need bits 8 and 9. 775 */ 776 #define HAMMER2_AVF_SELMASK 0x03 /* select group */ 777 #define HAMMER2_AVF_ALL_ALLOC 0x04 /* indicate all allocated */ 778 #define HAMMER2_AVF_ALL_FREE 0x08 /* indicate all free */ 779 #define HAMMER2_AVF_RESERVED10 0x10 780 #define HAMMER2_AVF_RESERVED20 0x20 781 #define HAMMER2_AVF_RESERVED40 0x40 782 #define HAMMER2_AVF_RESERVED80 0x80 783 #define HAMMER2_AVF_AVMASK32 ((uint32_t)0xFFFFFF00LU) 784 #define HAMMER2_AVF_AVMASK64 ((uint64_t)0xFFFFFFFFFFFFFF00LLU) 785 786 #define HAMMER2_AV_SELECT_A 0x00 787 #define HAMMER2_AV_SELECT_B 0x01 788 #define HAMMER2_AV_SELECT_C 0x02 789 #define HAMMER2_AV_SELECT_D 0x03 790 791 /* 792 * The volume header eats a 64K block. There is currently an issue where 793 * we want to try to fit all nominal filesystem updates in a 512-byte section 794 * but it may be a lost cause due to the need for a blockset. 795 * 796 * All information is stored in host byte order. The volume header's magic 797 * number may be checked to determine the byte order. If you wish to mount 798 * between machines w/ different endian modes you'll need filesystem code 799 * which acts on the media data consistently (either all one way or all the 800 * other). Our code currently does not do that. 801 * 802 * A read-write mount may have to recover missing allocations by doing an 803 * incremental mirror scan looking for modifications made after alloc_tid. 804 * If alloc_tid == last_tid then no recovery operation is needed. Recovery 805 * operations are usually very, very fast. 806 * 807 * Read-only mounts do not need to do any recovery, access to the filesystem 808 * topology is always consistent after a crash (is always consistent, period). 809 * However, there may be shortcutted blockref updates present from deep in 810 * the tree which are stored in the volumeh eader and must be tracked on 811 * the fly. 812 * 813 * NOTE: The copyinfo[] array contains the configuration for both the 814 * cluster connections and any local media copies. The volume 815 * header will be replicated for each local media copy. 816 * 817 * The mount command may specify multiple medias or just one and 818 * allow HAMMER2 to pick up the others when it checks the copyinfo[] 819 * array on mount. 820 * 821 * NOTE: root_blockref points to the super-root directory, not the root 822 * directory. The root directory will be a subdirectory under the 823 * super-root. 824 * 825 * The super-root directory contains all root directories and all 826 * snapshots (readonly or writable). It is possible to do a 827 * null-mount of the super-root using special path constructions 828 * relative to your mounted root. 829 * 830 * NOTE: HAMMER2 allows any subdirectory tree to be managed as if it were 831 * a PFS, including mirroring and storage quota operations, and this is 832 * prefered over creating discrete PFSs in the super-root. Instead 833 * the super-root is most typically used to create writable snapshots, 834 * alternative roots, and so forth. The super-root is also used by 835 * the automatic snapshotting mechanism. 836 */ 837 #define HAMMER2_VOLUME_ID_HBO 0x48414d3205172011LLU 838 #define HAMMER2_VOLUME_ID_ABO 0x11201705324d4148LLU 839 840 struct hammer2_volume_data { 841 /* 842 * sector #0 - 512 bytes 843 */ 844 uint64_t magic; /* 0000 Signature */ 845 hammer2_off_t boot_beg; /* 0008 Boot area (future) */ 846 hammer2_off_t boot_end; /* 0010 (size = end - beg) */ 847 hammer2_off_t aux_beg; /* 0018 Aux area (future) */ 848 hammer2_off_t aux_end; /* 0020 (size = end - beg) */ 849 hammer2_off_t volu_size; /* 0028 Volume size, bytes */ 850 851 uint32_t version; /* 0030 */ 852 uint32_t flags; /* 0034 */ 853 uint8_t copyid; /* 0038 copyid of phys vol */ 854 uint8_t freemap_version; /* 0039 freemap algorithm */ 855 uint8_t peer_type; /* 003A HAMMER2_PEER_xxx */ 856 uint8_t reserved003B; /* 003B */ 857 uint32_t reserved003C; /* 003C */ 858 859 uuid_t fsid; /* 0040 */ 860 uuid_t fstype; /* 0050 */ 861 862 /* 863 * allocator_size is precalculated at newfs time and does not include 864 * reserved blocks, boot, or redo areas. 865 * 866 * Initial non-reserved-area allocations do not use the freemap 867 * but instead adjust alloc_iterator. Dynamic allocations take 868 * over starting at (allocator_beg). This makes newfs_hammer2's 869 * job a lot easier and can also serve as a testing jig. 870 */ 871 hammer2_off_t allocator_size; /* 0060 Total data space */ 872 hammer2_off_t allocator_free; /* 0068 Free space */ 873 hammer2_off_t allocator_beg; /* 0070 Initial allocations */ 874 hammer2_tid_t mirror_tid; /* 0078 best committed tid */ 875 hammer2_tid_t alloc_tid; /* 0080 Alloctable modify tid */ 876 hammer2_blockref_t freemap_blockref; /* 0088-00C7 */ 877 878 /* 879 * Copyids are allocated dynamically from the copyexists bitmap. 880 * An id from the active copies set (up to 8, see copyinfo later on) 881 * may still exist after the copy set has been removed from the 882 * volume header and its bit will remain active in the bitmap and 883 * cannot be reused until it is 100% removed from the hierarchy. 884 */ 885 uint32_t copyexists[8]; /* 00C8-00E7 copy exists bmap */ 886 char reserved0140[248]; /* 00E8-01DF */ 887 888 /* 889 * 32 bit CRC array at the end of the first 512 byte sector. 890 * 891 * icrc_sects[7] - First 512-4 bytes of volume header (including all 892 * the other icrc's except the last one). 893 * 894 * icrc_sects[6] - Second 512-4 bytes of volume header, which is 895 * the blockset for the root. 896 */ 897 hammer2_crc32_t icrc_sects[8]; /* 01E0-01FF */ 898 899 /* 900 * sector #1 - 512 bytes 901 * 902 * The entire sector is used by a blockset. 903 */ 904 hammer2_blockset_t sroot_blockset; /* 0200-03FF Superroot dir */ 905 906 /* 907 * sector #2-7 908 */ 909 char sector2[512]; /* 0400-05FF reserved */ 910 char sector3[512]; /* 0600-07FF reserved */ 911 char sector4[512]; /* 0800-09FF reserved */ 912 char sector5[512]; /* 0A00-0BFF reserved */ 913 char sector6[512]; /* 0C00-0DFF reserved */ 914 char sector7[512]; /* 0E00-0FFF reserved */ 915 916 /* 917 * sector #8-71 - 32768 bytes 918 * 919 * Contains the configuration for up to 256 copyinfo targets. These 920 * specify local and remote copies operating as masters or slaves. 921 * copyid's 0 and 255 are reserved (0 indicates an empty slot and 255 922 * indicates the local media). 923 * 924 * Each inode contains a set of up to 8 copyids, either inherited 925 * from its parent or explicitly specified in the inode, which 926 * indexes into this array. 927 */ 928 /* 1000-8FFF copyinfo config */ 929 dmsg_vol_data_t copyinfo[HAMMER2_COPYID_COUNT]; 930 931 /* 932 * Remaining sections are reserved for future use. 933 */ 934 char reserved0400[0x6FFC]; /* 9000-FFFB reserved */ 935 936 /* 937 * icrc on entire volume header 938 */ 939 hammer2_crc32_t icrc_volheader; /* FFFC-FFFF full volume icrc*/ 940 }; 941 942 typedef struct hammer2_volume_data hammer2_volume_data_t; 943 944 /* 945 * Various parts of the volume header have their own iCRCs. 946 * 947 * The first 512 bytes has its own iCRC stored at the end of the 512 bytes 948 * and not included the icrc calculation. 949 * 950 * The second 512 bytes also has its own iCRC but it is stored in the first 951 * 512 bytes so it covers the entire second 512 bytes. 952 * 953 * The whole volume block (64KB) has an iCRC covering all but the last 4 bytes, 954 * which is where the iCRC for the whole volume is stored. This is currently 955 * a catch-all for anything not individually iCRCd. 956 */ 957 #define HAMMER2_VOL_ICRC_SECT0 7 958 #define HAMMER2_VOL_ICRC_SECT1 6 959 960 #define HAMMER2_VOLUME_BYTES 65536 961 962 #define HAMMER2_VOLUME_ICRC0_OFF 0 963 #define HAMMER2_VOLUME_ICRC1_OFF 512 964 #define HAMMER2_VOLUME_ICRCVH_OFF 0 965 966 #define HAMMER2_VOLUME_ICRC0_SIZE (512 - 4) 967 #define HAMMER2_VOLUME_ICRC1_SIZE (512) 968 #define HAMMER2_VOLUME_ICRCVH_SIZE (65536 - 4) 969 970 #define HAMMER2_VOL_VERSION_MIN 1 971 #define HAMMER2_VOL_VERSION_DEFAULT 1 972 #define HAMMER2_VOL_VERSION_WIP 2 973 974 #define HAMMER2_NUM_VOLHDRS 4 975 976 union hammer2_media_data { 977 hammer2_volume_data_t voldata; 978 hammer2_inode_data_t ipdata; 979 hammer2_indblock_data_t npdata; 980 char buf[HAMMER2_PBUFSIZE]; 981 }; 982 983 typedef union hammer2_media_data hammer2_media_data_t; 984 985 #endif 986