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 * $DragonFly: src/sys/vfs/hammer/hammer_disk.h,v 1.55 2008/11/13 02:18:43 dillon Exp $ 35 */ 36 37 #ifndef VFS_HAMMER_DISK_H_ 38 #define VFS_HAMMER_DISK_H_ 39 40 #ifndef _SYS_UUID_H_ 41 #include <sys/uuid.h> 42 #endif 43 44 /* 45 * The structures below represent the on-disk format for a HAMMER 46 * filesystem. Note that all fields for on-disk structures are naturally 47 * aligned. The host endian format is used - compatibility is possible 48 * if the implementation detects reversed endian and adjusts data accordingly. 49 * 50 * Most of HAMMER revolves around the concept of an object identifier. An 51 * obj_id is a 64 bit quantity which uniquely identifies a filesystem object 52 * FOR THE ENTIRE LIFE OF THE FILESYSTEM. This uniqueness allows backups 53 * and mirrors to retain varying amounts of filesystem history by removing 54 * any possibility of conflict through identifier reuse. 55 * 56 * A HAMMER filesystem may span multiple volumes. 57 * 58 * A HAMMER filesystem uses a 16K filesystem buffer size. All filesystem 59 * I/O is done in multiples of 16K. 60 * 61 * 64K X-bufs are used for blocks >= a file's 1MB mark. 62 * 63 * Per-volume storage limit: 52 bits 4096 TB 64 * Per-Zone storage limit: 60 bits 1 MTB 65 * Per-filesystem storage limit: 60 bits 1 MTB 66 */ 67 #define HAMMER_BUFSIZE 16384 68 #define HAMMER_XBUFSIZE 65536 69 #define HAMMER_HBUFSIZE (HAMMER_BUFSIZE / 2) 70 #define HAMMER_XDEMARC (1024 * 1024) 71 #define HAMMER_BUFMASK (HAMMER_BUFSIZE - 1) 72 #define HAMMER_XBUFMASK (HAMMER_XBUFSIZE - 1) 73 74 #define HAMMER_BUFSIZE64 ((uint64_t)HAMMER_BUFSIZE) 75 #define HAMMER_BUFMASK64 ((uint64_t)HAMMER_BUFMASK) 76 77 #define HAMMER_XBUFSIZE64 ((uint64_t)HAMMER_XBUFSIZE) 78 #define HAMMER_XBUFMASK64 ((uint64_t)HAMMER_XBUFMASK) 79 80 #define HAMMER_OFF_ZONE_MASK 0xF000000000000000ULL /* zone portion */ 81 #define HAMMER_OFF_VOL_MASK 0x0FF0000000000000ULL /* volume portion */ 82 #define HAMMER_OFF_SHORT_MASK 0x000FFFFFFFFFFFFFULL /* offset portion */ 83 #define HAMMER_OFF_LONG_MASK 0x0FFFFFFFFFFFFFFFULL /* offset portion */ 84 85 #define HAMMER_OFF_BAD ((hammer_off_t)-1) 86 87 /* 88 * The current limit of volumes that can make up a HAMMER FS 89 */ 90 #define HAMMER_MAX_VOLUMES 256 91 92 /* 93 * Reserved space for (future) header junk after the volume header. 94 */ 95 #define HAMMER_VOL_ALLOC (HAMMER_BUFSIZE * 16) 96 97 /* 98 * Hammer transaction ids are 64 bit unsigned integers and are usually 99 * synchronized with the time of day in nanoseconds. 100 * 101 * Hammer offsets are used for FIFO indexing and embed a cycle counter 102 * and volume number in addition to the offset. Most offsets are required 103 * to be 16 KB aligned. 104 */ 105 typedef uint64_t hammer_tid_t; 106 typedef uint64_t hammer_off_t; 107 typedef uint32_t hammer_crc_t; 108 109 #define HAMMER_MIN_TID 0ULL /* unsigned */ 110 #define HAMMER_MAX_TID 0xFFFFFFFFFFFFFFFFULL /* unsigned */ 111 #define HAMMER_MIN_KEY -0x8000000000000000LL /* signed */ 112 #define HAMMER_MAX_KEY 0x7FFFFFFFFFFFFFFFLL /* signed */ 113 #define HAMMER_MIN_OBJID HAMMER_MIN_KEY /* signed */ 114 #define HAMMER_MAX_OBJID HAMMER_MAX_KEY /* signed */ 115 #define HAMMER_MIN_RECTYPE 0x0U /* unsigned */ 116 #define HAMMER_MAX_RECTYPE 0xFFFFU /* unsigned */ 117 #define HAMMER_MIN_OFFSET 0ULL /* unsigned */ 118 #define HAMMER_MAX_OFFSET 0xFFFFFFFFFFFFFFFFULL /* unsigned */ 119 120 /* 121 * hammer_off_t has several different encodings. Note that not all zones 122 * encode a vol_no. Zone bits are not a part of filesystem capacity. 123 * 124 * zone 0: available, a big-block that contains the offset is unused 125 * zone 1 (z,v,o): raw volume relative (offset 0 is the volume header) 126 * zone 2 (z,v,o): raw buffer relative (offset 0 is the first buffer) 127 * zone 3 (z,o): undo fifo - actually zone-2 address, fixed phys array in vol hdr 128 * zone 4 (z,v,o): freemap - only real blockmap 129 * zone 8 (z,v,o): B-Tree - actually zone-2 address 130 * zone 9 (z,v,o): meta - actually zone-2 address 131 * zone 10 (z,v,o): large-data - actually zone-2 address 132 * zone 11 (z,v,o): small-data - actually zone-2 address 133 * zone 15: unavailable, usually the offset is beyond volume size 134 * 135 * layer1/layer2 direct map: 136 * Maximum HAMMER filesystem capacity from volume aspect 137 * 2^8(max volumes) * 2^52(max volume size) = 2^60 = 1EB 138 * <-------------------------------------------------------------> 139 * 8bits 52bits 140 * <------><-----------------------------------------------------> 141 * zzzzvvvvvvvvoooo oooooooooooooooo oooooooooooooooo oooooooooooooooo 142 * ----111111111111 1111112222222222 222222222ooooooo oooooooooooooooo 143 * <-----------------><------------------><----------------------> 144 * 18bits 19bits 23bits 145 * <-------------------------------------------------------------> 146 * 2^18(layer1) * 2^19(layer2) * 2^23(big-block) = 2^60 = 1EB 147 * Maximum HAMMER filesystem capacity from blockmap aspect 148 */ 149 150 #define HAMMER_ZONE_RAW_VOLUME 0x1000000000000000ULL 151 #define HAMMER_ZONE_RAW_BUFFER 0x2000000000000000ULL 152 #define HAMMER_ZONE_UNDO 0x3000000000000000ULL 153 #define HAMMER_ZONE_FREEMAP 0x4000000000000000ULL 154 #define HAMMER_ZONE_RESERVED05 0x5000000000000000ULL /* not used */ 155 #define HAMMER_ZONE_RESERVED06 0x6000000000000000ULL /* not used */ 156 #define HAMMER_ZONE_RESERVED07 0x7000000000000000ULL /* not used */ 157 #define HAMMER_ZONE_BTREE 0x8000000000000000ULL 158 #define HAMMER_ZONE_META 0x9000000000000000ULL 159 #define HAMMER_ZONE_LARGE_DATA 0xA000000000000000ULL 160 #define HAMMER_ZONE_SMALL_DATA 0xB000000000000000ULL 161 #define HAMMER_ZONE_RESERVED0C 0xC000000000000000ULL /* not used */ 162 #define HAMMER_ZONE_RESERVED0D 0xD000000000000000ULL /* not used */ 163 #define HAMMER_ZONE_RESERVED0E 0xE000000000000000ULL /* not used */ 164 #define HAMMER_ZONE_UNAVAIL 0xF000000000000000ULL 165 166 #define HAMMER_ZONE_RAW_VOLUME_INDEX 1 167 #define HAMMER_ZONE_RAW_BUFFER_INDEX 2 168 #define HAMMER_ZONE_UNDO_INDEX 3 169 #define HAMMER_ZONE_FREEMAP_INDEX 4 170 #define HAMMER_ZONE_BTREE_INDEX 8 171 #define HAMMER_ZONE_META_INDEX 9 172 #define HAMMER_ZONE_LARGE_DATA_INDEX 10 173 #define HAMMER_ZONE_SMALL_DATA_INDEX 11 174 #define HAMMER_ZONE_UNAVAIL_INDEX 15 175 176 #define HAMMER_MAX_ZONES 16 177 178 #define HAMMER_ZONE(offset) ((offset) & HAMMER_OFF_ZONE_MASK) 179 180 #define hammer_is_zone_raw_volume(offset) \ 181 (HAMMER_ZONE(offset) == HAMMER_ZONE_RAW_VOLUME) 182 #define hammer_is_zone_raw_buffer(offset) \ 183 (HAMMER_ZONE(offset) == HAMMER_ZONE_RAW_BUFFER) 184 #define hammer_is_zone_undo(offset) \ 185 (HAMMER_ZONE(offset) == HAMMER_ZONE_UNDO) 186 #define hammer_is_zone_freemap(offset) \ 187 (HAMMER_ZONE(offset) == HAMMER_ZONE_FREEMAP) 188 #define hammer_is_zone_btree(offset) \ 189 (HAMMER_ZONE(offset) == HAMMER_ZONE_BTREE) 190 #define hammer_is_zone_meta(offset) \ 191 (HAMMER_ZONE(offset) == HAMMER_ZONE_META) 192 #define hammer_is_zone_large_data(offset) \ 193 (HAMMER_ZONE(offset) == HAMMER_ZONE_LARGE_DATA) 194 #define hammer_is_zone_small_data(offset) \ 195 (HAMMER_ZONE(offset) == HAMMER_ZONE_SMALL_DATA) 196 #define hammer_is_zone_unavail(offset) \ 197 (HAMMER_ZONE(offset) == HAMMER_ZONE_UNAVAIL) 198 #define hammer_is_zone_data(offset) \ 199 (hammer_is_zone_large_data(offset) || hammer_is_zone_small_data(offset)) 200 201 /* 202 * Test if the zone is directly mapped to zone-2 offset via freemap. 203 */ 204 #define hammer_is_zone2_mapped_index(zone) \ 205 ((zone) >= HAMMER_ZONE_BTREE_INDEX && \ 206 (zone) < HAMMER_MAX_ZONES) 207 /* 208 * Test if the zone is directly mapped to zone-2 offset. The word 209 * directly here means the zone is neither RAW_VOLUME nor UNDO zone. 210 */ 211 #define hammer_is_direct_mapped_index(zone) \ 212 (((zone) == HAMMER_ZONE_RAW_BUFFER_INDEX) || \ 213 ((zone) == HAMMER_ZONE_FREEMAP_INDEX) || \ 214 hammer_is_zone2_mapped_index(zone)) 215 216 #define HAMMER_ZONE_ENCODE(zone, ham_off) \ 217 (((hammer_off_t)(zone) << 60) | (ham_off)) 218 #define HAMMER_ZONE_DECODE(ham_off) \ 219 ((int)(((hammer_off_t)(ham_off) >> 60))) 220 221 #define HAMMER_VOL_ENCODE(vol_no) \ 222 ((hammer_off_t)((vol_no) & 255) << 52) 223 #define HAMMER_VOL_DECODE(ham_off) \ 224 ((int)(((hammer_off_t)(ham_off) >> 52) & 255)) 225 226 #define HAMMER_OFF_SHORT_ENCODE(offset) \ 227 ((hammer_off_t)(offset) & HAMMER_OFF_SHORT_MASK) 228 #define HAMMER_OFF_LONG_ENCODE(offset) \ 229 ((hammer_off_t)(offset) & HAMMER_OFF_LONG_MASK) 230 231 #define HAMMER_ENCODE(zone, vol_no, offset) \ 232 (((hammer_off_t)(zone) << 60) | \ 233 HAMMER_VOL_ENCODE(vol_no) | \ 234 HAMMER_OFF_SHORT_ENCODE(offset)) 235 #define HAMMER_ENCODE_RAW_VOLUME(vol_no, offset) \ 236 HAMMER_ENCODE(HAMMER_ZONE_RAW_VOLUME_INDEX, vol_no, offset) 237 #define HAMMER_ENCODE_RAW_BUFFER(vol_no, offset) \ 238 HAMMER_ENCODE(HAMMER_ZONE_RAW_BUFFER_INDEX, vol_no, offset) 239 #define HAMMER_ENCODE_FREEMAP(vol_no, offset) \ 240 HAMMER_ENCODE(HAMMER_ZONE_FREEMAP_INDEX, vol_no, offset) 241 242 /* 243 * Translate a zone address to zone-X address. 244 */ 245 #define hammer_xlate_to_zoneX(zone, offset) \ 246 HAMMER_ZONE_ENCODE((zone), (offset) & ~HAMMER_OFF_ZONE_MASK) 247 #define hammer_xlate_to_zone2(offset) \ 248 hammer_xlate_to_zoneX(HAMMER_ZONE_RAW_BUFFER_INDEX, (offset)) 249 250 #define hammer_data_zone(data_len) \ 251 (((data_len) >= HAMMER_BUFSIZE) ? \ 252 HAMMER_ZONE_LARGE_DATA : \ 253 HAMMER_ZONE_SMALL_DATA) 254 #define hammer_data_zone_index(data_len) \ 255 (((data_len) >= HAMMER_BUFSIZE) ? \ 256 HAMMER_ZONE_LARGE_DATA_INDEX : \ 257 HAMMER_ZONE_SMALL_DATA_INDEX) 258 259 /* 260 * Big-Block backing store 261 * 262 * A blockmap is a two-level map which translates a blockmap-backed zone 263 * offset into a raw zone 2 offset. The layer 1 handles 18 bits and the 264 * layer 2 handles 19 bits. The 8M big-block size is 23 bits so two 265 * layers gives us 18+19+23 = 60 bits of address space. 266 * 267 * When using hinting for a blockmap lookup, the hint is lost when the 268 * scan leaves the HINTBLOCK, which is typically several BIGBLOCK's. 269 * HINTBLOCK is a heuristic. 270 */ 271 #define HAMMER_HINTBLOCK_SIZE (HAMMER_BIGBLOCK_SIZE * 4) 272 #define HAMMER_HINTBLOCK_MASK64 ((uint64_t)HAMMER_HINTBLOCK_SIZE - 1) 273 #define HAMMER_BIGBLOCK_SIZE (8192 * 1024) 274 #define HAMMER_BIGBLOCK_SIZE64 ((uint64_t)HAMMER_BIGBLOCK_SIZE) 275 #define HAMMER_BIGBLOCK_MASK (HAMMER_BIGBLOCK_SIZE - 1) 276 #define HAMMER_BIGBLOCK_MASK64 ((uint64_t)HAMMER_BIGBLOCK_SIZE - 1) 277 #define HAMMER_BIGBLOCK_BITS 23 278 #if 0 279 #define HAMMER_BIGBLOCK_OVERFILL (6144 * 1024) 280 #endif 281 #if (1 << HAMMER_BIGBLOCK_BITS) != HAMMER_BIGBLOCK_SIZE 282 #error "HAMMER_BIGBLOCK_BITS BROKEN" 283 #endif 284 285 #define HAMMER_BUFFERS_PER_BIGBLOCK \ 286 (HAMMER_BIGBLOCK_SIZE / HAMMER_BUFSIZE) 287 #define HAMMER_BUFFERS_PER_BIGBLOCK_MASK \ 288 (HAMMER_BUFFERS_PER_BIGBLOCK - 1) 289 #define HAMMER_BUFFERS_PER_BIGBLOCK_MASK64 \ 290 ((hammer_off_t)HAMMER_BUFFERS_PER_BIGBLOCK_MASK) 291 292 /* 293 * Maximum number of mirrors operating in master mode (multi-master 294 * clustering and mirroring). Note that HAMMER1 does not support 295 * multi-master clustering as of 2015. 296 */ 297 #define HAMMER_MAX_MASTERS 16 298 299 /* 300 * The blockmap is somewhat of a degenerate structure. HAMMER only actually 301 * uses it in its original incarnation to implement the freemap. 302 * 303 * zone:1 raw volume (no blockmap) 304 * zone:2 raw buffer (no blockmap) 305 * zone:3 undomap (direct layer2 array in volume header) 306 * zone:4 freemap (the only real blockmap) 307 * zone:8-15 zone id used to classify big-block only, address is actually 308 * a zone-2 address. 309 */ 310 struct hammer_blockmap { 311 hammer_off_t phys_offset; /* zone-2 physical offset */ 312 hammer_off_t first_offset; /* zone-X logical offset (zone 3) */ 313 hammer_off_t next_offset; /* zone-X logical offset */ 314 hammer_off_t alloc_offset; /* zone-X logical offset */ 315 uint32_t reserved01; 316 hammer_crc_t entry_crc; 317 }; 318 319 typedef struct hammer_blockmap *hammer_blockmap_t; 320 321 #define HAMMER_BLOCKMAP_CRCSIZE \ 322 offsetof(struct hammer_blockmap, entry_crc) 323 324 /* 325 * The blockmap is a 2-layer entity made up of big-blocks. The first layer 326 * contains 262144 32-byte entries (18 bits), the second layer contains 327 * 524288 16-byte entries (19 bits), representing 8MB (23 bit) blockmaps. 328 * 18+19+23 = 60 bits. The top four bits are the zone id. 329 * 330 * Currently only the freemap utilizes both layers in all their glory. 331 * All primary data/meta-data zones actually encode a zone-2 address 332 * requiring no real blockmap translation. 333 * 334 * The freemap uses the upper 8 bits of layer-1 to identify the volume, 335 * thus any space allocated via the freemap can be directly translated 336 * to a zone:2 (or zone:8-15) address. 337 * 338 * zone-X blockmap offset: [zone:4][layer1:18][layer2:19][big-block:23] 339 */ 340 341 /* 342 * 32 bytes layer1 entry for 8MB big-block. 343 * A big-block can hold 2^23 / 2^5 = 2^18 layer1 entries, 344 * which equals bits assigned for layer1 in zone-2 address. 345 */ 346 struct hammer_blockmap_layer1 { 347 hammer_off_t blocks_free; /* big-blocks free */ 348 hammer_off_t phys_offset; /* UNAVAIL or zone-2 */ 349 hammer_off_t reserved01; 350 hammer_crc_t layer2_crc; /* xor'd crc's of HAMMER_BLOCKSIZE */ 351 /* (not yet used) */ 352 hammer_crc_t layer1_crc; /* MUST BE LAST FIELD OF STRUCTURE*/ 353 }; 354 355 typedef struct hammer_blockmap_layer1 *hammer_blockmap_layer1_t; 356 357 #define HAMMER_LAYER1_CRCSIZE \ 358 offsetof(struct hammer_blockmap_layer1, layer1_crc) 359 360 /* 361 * 16 bytes layer2 entry for 8MB big-blocks. 362 * A big-block can hold 2^23 / 2^4 = 2^19 layer2 entries, 363 * which equals bits assigned for layer2 in zone-2 address. 364 * 365 * NOTE: bytes_free is signed and can legally go negative if/when data 366 * de-dup occurs. This field will never go higher than 367 * HAMMER_BIGBLOCK_SIZE. If exactly HAMMER_BIGBLOCK_SIZE 368 * the big-block is completely free. 369 */ 370 struct hammer_blockmap_layer2 { 371 uint8_t zone; /* typed allocation zone */ 372 uint8_t unused01; 373 uint16_t unused02; 374 uint32_t append_off; /* allocatable space index */ 375 int32_t bytes_free; /* bytes free within this big-block */ 376 hammer_crc_t entry_crc; 377 }; 378 379 typedef struct hammer_blockmap_layer2 *hammer_blockmap_layer2_t; 380 381 #define HAMMER_LAYER2_CRCSIZE \ 382 offsetof(struct hammer_blockmap_layer2, entry_crc) 383 384 #define HAMMER_BLOCKMAP_UNAVAIL ((hammer_off_t)-1LL) 385 386 #define HAMMER_BLOCKMAP_RADIX1 /* 2^18 = 262144 */ \ 387 ((int)(HAMMER_BIGBLOCK_SIZE / sizeof(struct hammer_blockmap_layer1))) 388 #define HAMMER_BLOCKMAP_RADIX2 /* 2^19 = 524288 */ \ 389 ((int)(HAMMER_BIGBLOCK_SIZE / sizeof(struct hammer_blockmap_layer2))) 390 391 #define HAMMER_BLOCKMAP_LAYER1 /* 2^(18+19+23) = 1EB */ \ 392 (HAMMER_BLOCKMAP_RADIX1 * HAMMER_BLOCKMAP_LAYER2) 393 #define HAMMER_BLOCKMAP_LAYER2 /* 2^(19+23) = 4TB */ \ 394 (HAMMER_BLOCKMAP_RADIX2 * HAMMER_BIGBLOCK_SIZE64) 395 396 #define HAMMER_BLOCKMAP_LAYER1_MASK (HAMMER_BLOCKMAP_LAYER1 - 1) 397 #define HAMMER_BLOCKMAP_LAYER2_MASK (HAMMER_BLOCKMAP_LAYER2 - 1) 398 399 /* 400 * Index within layer1 or layer2 big-block for the entry representing 401 * a zone-2 physical offset. 402 */ 403 #define HAMMER_BLOCKMAP_LAYER1_INDEX(zone2_offset) \ 404 ((int)(((zone2_offset) & HAMMER_BLOCKMAP_LAYER1_MASK) / \ 405 HAMMER_BLOCKMAP_LAYER2)) 406 407 #define HAMMER_BLOCKMAP_LAYER2_INDEX(zone2_offset) \ 408 ((int)(((zone2_offset) & HAMMER_BLOCKMAP_LAYER2_MASK) / \ 409 HAMMER_BIGBLOCK_SIZE64)) 410 411 /* 412 * Byte offset within layer1 or layer2 big-block for the entry representing 413 * a zone-2 physical offset. Multiply the index by sizeof(blockmap_layer). 414 */ 415 #define HAMMER_BLOCKMAP_LAYER1_OFFSET(zone2_offset) \ 416 (HAMMER_BLOCKMAP_LAYER1_INDEX(zone2_offset) * \ 417 sizeof(struct hammer_blockmap_layer1)) 418 419 #define HAMMER_BLOCKMAP_LAYER2_OFFSET(zone2_offset) \ 420 (HAMMER_BLOCKMAP_LAYER2_INDEX(zone2_offset) * \ 421 sizeof(struct hammer_blockmap_layer2)) 422 423 /* 424 * HAMMER UNDO parameters. The UNDO fifo is mapped directly in the volume 425 * header with an array of layer2 structures. A maximum of (128x8MB) = 1GB 426 * may be reserved. The size of the undo fifo is usually set a newfs time 427 * but can be adjusted if the filesystem is taken offline. 428 */ 429 #define HAMMER_UNDO_LAYER2 128 /* max layer2 undo mapping entries */ 430 431 /* 432 * All on-disk HAMMER structures which make up elements of the UNDO FIFO 433 * contain a hammer_fifo_head and hammer_fifo_tail structure. This structure 434 * contains all the information required to validate the fifo element 435 * and to scan the fifo in either direction. The head is typically embedded 436 * in higher level hammer on-disk structures while the tail is typically 437 * out-of-band. hdr_size is the size of the whole mess, including the tail. 438 * 439 * All undo structures are guaranteed to not cross a 16K filesystem 440 * buffer boundary. Most undo structures are fairly small. Data spaces 441 * are not immediately reused by HAMMER so file data is not usually recorded 442 * as part of an UNDO. 443 * 444 * PAD elements are allowed to take up only 8 bytes of space as a special 445 * case, containing only hdr_signature, hdr_type, and hdr_size fields, 446 * and with the tail overloaded onto the head structure for 8 bytes total. 447 * 448 * Every undo record has a sequence number. This number is unrelated to 449 * transaction ids and instead collects the undo transactions associated 450 * with a single atomic operation. A larger transactional operation, such 451 * as a remove(), may consist of several smaller atomic operations 452 * representing raw meta-data operations. 453 * 454 * HAMMER VERSION 4 CHANGES 455 * 456 * In HAMMER version 4 the undo structure alignment is reduced from 16384 457 * to 512 bytes in order to ensure that each 512 byte sector begins with 458 * a header. The reserved01 field in the header is now a 32 bit sequence 459 * number. This allows the recovery code to detect missing sectors 460 * without relying on the 32-bit crc and to definitively identify the current 461 * undo sequence space without having to rely on information from the volume 462 * header. In addition, new REDO entries in the undo space are used to 463 * record write, write/extend, and transaction id updates. 464 * 465 * The grand result is: 466 * 467 * (1) The volume header no longer needs to be synchronized for most 468 * flush and fsync operations. 469 * 470 * (2) Most fsync operations need only lay down REDO records 471 * 472 * (3) Data overwrite for nohistory operations covered by REDO records 473 * can be supported (instead of rolling a new block allocation), 474 * by rolling UNDO for the prior contents of the data. 475 * 476 * HAMMER VERSION 5 CHANGES 477 * 478 * Hammer version 5 contains a minor adjustment making layer2's bytes_free 479 * field signed, allowing dedup to push it into the negative domain. 480 */ 481 #define HAMMER_HEAD_ALIGN 8 482 #define HAMMER_HEAD_ALIGN_MASK (HAMMER_HEAD_ALIGN - 1) 483 #define HAMMER_HEAD_DOALIGN(bytes) \ 484 (((bytes) + HAMMER_HEAD_ALIGN_MASK) & ~HAMMER_HEAD_ALIGN_MASK) 485 486 #define HAMMER_UNDO_ALIGN 512 487 #define HAMMER_UNDO_ALIGN64 ((uint64_t)512) 488 #define HAMMER_UNDO_MASK (HAMMER_UNDO_ALIGN - 1) 489 #define HAMMER_UNDO_MASK64 (HAMMER_UNDO_ALIGN64 - 1) 490 491 struct hammer_fifo_head { 492 uint16_t hdr_signature; 493 uint16_t hdr_type; 494 uint32_t hdr_size; /* Aligned size of the whole mess */ 495 uint32_t hdr_seq; /* Sequence number */ 496 hammer_crc_t hdr_crc; /* XOR crc up to field w/ crc after field */ 497 }; 498 499 #define HAMMER_FIFO_HEAD_CRCOFF offsetof(struct hammer_fifo_head, hdr_crc) 500 501 struct hammer_fifo_tail { 502 uint16_t tail_signature; 503 uint16_t tail_type; 504 uint32_t tail_size; /* aligned size of the whole mess */ 505 }; 506 507 typedef struct hammer_fifo_head *hammer_fifo_head_t; 508 typedef struct hammer_fifo_tail *hammer_fifo_tail_t; 509 510 /* 511 * Fifo header types. 512 * 513 * NOTE: 0x8000U part of HAMMER_HEAD_TYPE_PAD can be removed if the HAMMER 514 * version ever gets bumped again. It exists only to keep compatibility with 515 * older versions. 516 */ 517 #define HAMMER_HEAD_TYPE_PAD (0x0040U | 0x8000U) 518 #define HAMMER_HEAD_TYPE_DUMMY 0x0041U /* dummy entry w/seqno */ 519 #define HAMMER_HEAD_TYPE_UNDO 0x0043U /* random UNDO information */ 520 #define HAMMER_HEAD_TYPE_REDO 0x0044U /* data REDO / fast fsync */ 521 522 #define HAMMER_HEAD_SIGNATURE 0xC84EU 523 #define HAMMER_TAIL_SIGNATURE 0xC74FU 524 525 /* 526 * Misc FIFO structures. 527 * 528 * UNDO - Raw meta-data media updates. 529 */ 530 struct hammer_fifo_undo { 531 struct hammer_fifo_head head; 532 hammer_off_t undo_offset; /* zone-1,2 offset */ 533 int32_t undo_data_bytes; 534 int32_t undo_reserved01; 535 /* followed by data */ 536 }; 537 538 /* 539 * REDO (HAMMER version 4+) - Logical file writes/truncates. 540 * 541 * REDOs contain information which will be duplicated in a later meta-data 542 * update, allowing fast write()+fsync() operations. REDOs can be ignored 543 * without harming filesystem integrity but must be processed if fsync() 544 * semantics are desired. 545 * 546 * Unlike UNDOs which are processed backwards within the recovery span, 547 * REDOs must be processed forwards starting further back (starting outside 548 * the recovery span). 549 * 550 * WRITE - Write logical file (with payload). Executed both 551 * out-of-span and in-span. Out-of-span WRITEs may be 552 * filtered out by TERMs. 553 * 554 * TRUNC - Truncate logical file (no payload). Executed both 555 * out-of-span and in-span. Out-of-span WRITEs may be 556 * filtered out by TERMs. 557 * 558 * TERM_* - Indicates meta-data was committed (if out-of-span) or 559 * will be rolled-back (in-span). Any out-of-span TERMs 560 * matching earlier WRITEs remove those WRITEs from 561 * consideration as they might conflict with a later data 562 * commit (which is not being rolled-back). 563 * 564 * SYNC - The earliest in-span SYNC (the last one when scanning 565 * backwards) tells the recovery code how far out-of-span 566 * it must go to run REDOs. 567 * 568 * NOTE: WRITEs do not always have matching TERMs even under 569 * perfect conditions because truncations might remove the 570 * buffers from consideration. I/O problems can also remove 571 * buffers from consideration. 572 * 573 * TRUNCSs do not always have matching TERMs because several 574 * truncations may be aggregated together into a single TERM. 575 */ 576 struct hammer_fifo_redo { 577 struct hammer_fifo_head head; 578 int64_t redo_objid; /* file being written */ 579 hammer_off_t redo_offset; /* logical offset in file */ 580 int32_t redo_data_bytes; 581 uint32_t redo_flags; 582 uint32_t redo_localization; 583 uint32_t redo_reserved; 584 uint64_t redo_mtime; /* set mtime */ 585 }; 586 587 #define HAMMER_REDO_WRITE 0x00000001 588 #define HAMMER_REDO_TRUNC 0x00000002 589 #define HAMMER_REDO_TERM_WRITE 0x00000004 590 #define HAMMER_REDO_TERM_TRUNC 0x00000008 591 #define HAMMER_REDO_SYNC 0x00000010 592 593 union hammer_fifo_any { 594 struct hammer_fifo_head head; 595 struct hammer_fifo_undo undo; 596 struct hammer_fifo_redo redo; 597 }; 598 599 typedef struct hammer_fifo_redo *hammer_fifo_redo_t; 600 typedef struct hammer_fifo_undo *hammer_fifo_undo_t; 601 typedef union hammer_fifo_any *hammer_fifo_any_t; 602 603 /* 604 * Volume header types 605 */ 606 #define HAMMER_FSBUF_VOLUME 0xC8414D4DC5523031ULL /* HAMMER01 */ 607 #define HAMMER_FSBUF_VOLUME_REV 0x313052C54D4D41C8ULL /* (reverse endian) */ 608 609 /* 610 * HAMMER Volume header 611 * 612 * A HAMMER filesystem can be built from 1-256 block devices, each block 613 * device contains a volume header followed by however many buffers fit 614 * into the volume. 615 * 616 * One of the volumes making up a HAMMER filesystem is the root volume. 617 * The root volume is always volume #0 which is the first block device path 618 * specified by newfs_hammer(8). All HAMMER volumes have a volume header, 619 * however the root volume may be the only volume that has valid values for 620 * some fields in the header. 621 * 622 * Special field notes: 623 * 624 * vol_bot_beg - offset of boot area (mem_beg - bot_beg bytes) 625 * vol_mem_beg - offset of memory log (buf_beg - mem_beg bytes) 626 * vol_buf_beg - offset of the first buffer in volume 627 * vol_buf_end - offset of volume EOF (on buffer boundary) 628 * 629 * The memory log area allows a kernel to cache new records and data 630 * in memory without allocating space in the actual filesystem to hold 631 * the records and data. In the event that a filesystem becomes full, 632 * any records remaining in memory can be flushed to the memory log 633 * area. This allows the kernel to immediately return success. 634 * 635 * The buffer offset is a physical offset of zone-2 offset. The lower 636 * 52 bits of the zone-2 offset is added to the buffer offset of each 637 * volume to generate an actual I/O offset within the block device. 638 * 639 * NOTE: boot area and memory log are currently not used. 640 */ 641 642 /* 643 * These macros are only used by userspace when userspace commands either 644 * initialize or add a new HAMMER volume. 645 */ 646 #define HAMMER_BOOT_MINBYTES (32*1024) 647 #define HAMMER_BOOT_NOMBYTES (64LL*1024*1024) 648 #define HAMMER_BOOT_MAXBYTES (256LL*1024*1024) 649 650 #define HAMMER_MEM_MINBYTES (256*1024) 651 #define HAMMER_MEM_NOMBYTES (1LL*1024*1024*1024) 652 #define HAMMER_MEM_MAXBYTES (64LL*1024*1024*1024) 653 654 struct hammer_volume_ondisk { 655 uint64_t vol_signature; /* HAMMER_FSBUF_VOLUME for a valid header */ 656 657 /* 658 * These are relative to block device offset, not zone offsets. 659 */ 660 int64_t vol_bot_beg; /* offset of boot area */ 661 int64_t vol_mem_beg; /* offset of memory log */ 662 int64_t vol_buf_beg; /* offset of the first buffer in volume */ 663 int64_t vol_buf_end; /* offset of volume EOF (on buffer boundary) */ 664 int64_t vol_reserved00; 665 666 uuid_t vol_fsid; /* identify filesystem */ 667 uuid_t vol_fstype; /* identify filesystem type */ 668 char vol_label[64]; /* filesystem label */ 669 670 int32_t vol_no; /* volume number within filesystem */ 671 int32_t vol_count; /* number of volumes making up filesystem */ 672 673 uint32_t vol_version; /* version control information */ 674 hammer_crc_t vol_crc; /* header crc */ 675 uint32_t vol_flags; /* volume flags */ 676 uint32_t vol_rootvol; /* the root volume number (must be 0) */ 677 678 int32_t vol_reserved04; 679 int32_t vol_reserved05; 680 uint32_t vol_reserved06; 681 uint32_t vol_reserved07; 682 683 int64_t vol_reserved08; 684 int64_t vol_reserved09; 685 686 /* 687 * These fields are initialized and space is reserved in every 688 * volume making up a HAMMER filesytem, but only the root volume 689 * contains valid data. Note that vol0_stat_bigblocks does not 690 * include big-blocks for freemap and undomap initially allocated 691 * by newfs_hammer(8). 692 */ 693 int64_t vol0_stat_bigblocks; /* total big-blocks when fs is empty */ 694 int64_t vol0_stat_freebigblocks;/* number of free big-blocks */ 695 int64_t vol0_reserved11; 696 int64_t vol0_stat_inodes; /* for statfs only */ 697 int64_t vol0_reserved10; 698 hammer_off_t vol0_btree_root; /* B-Tree root offset in zone-8 */ 699 hammer_tid_t vol0_next_tid; /* highest partially synchronized TID */ 700 hammer_off_t vol0_unused03; 701 702 /* 703 * Blockmaps for zones. Not all zones use a blockmap. Note that 704 * the entire root blockmap is cached in the hammer_mount structure. 705 */ 706 struct hammer_blockmap vol0_blockmap[HAMMER_MAX_ZONES]; 707 708 /* 709 * Array of zone-2 addresses for undo FIFO. 710 */ 711 hammer_off_t vol0_undo_array[HAMMER_UNDO_LAYER2]; 712 }; 713 714 typedef struct hammer_volume_ondisk *hammer_volume_ondisk_t; 715 716 #define HAMMER_ROOT_VOLNO 0 717 718 #define HAMMER_VOLF_NEEDFLUSH 0x0004 /* volume needs flush */ 719 720 #define HAMMER_VOL_CRCSIZE1 \ 721 offsetof(struct hammer_volume_ondisk, vol_crc) 722 #define HAMMER_VOL_CRCSIZE2 \ 723 (sizeof(struct hammer_volume_ondisk) - HAMMER_VOL_CRCSIZE1 - \ 724 sizeof(hammer_crc_t)) 725 726 #define HAMMER_VOL_VERSION_MIN 1 /* minimum supported version */ 727 #define HAMMER_VOL_VERSION_DEFAULT 6 /* newfs default version */ 728 #define HAMMER_VOL_VERSION_WIP 7 /* version >= this is WIP */ 729 #define HAMMER_VOL_VERSION_MAX 6 /* maximum supported version */ 730 731 #define HAMMER_VOL_VERSION_ONE 1 732 #define HAMMER_VOL_VERSION_TWO 2 /* new dirent layout (2.3+) */ 733 #define HAMMER_VOL_VERSION_THREE 3 /* new snapshot layout (2.5+) */ 734 #define HAMMER_VOL_VERSION_FOUR 4 /* new undo/flush (2.5+) */ 735 #define HAMMER_VOL_VERSION_FIVE 5 /* dedup (2.9+) */ 736 #define HAMMER_VOL_VERSION_SIX 6 /* DIRHASH_ALG1 */ 737 738 /* 739 * Translate a zone-2 address to physical address 740 */ 741 #define hammer_xlate_to_phys(volume, zone2_offset) \ 742 ((volume)->vol_buf_beg + \ 743 ((zone2_offset) & HAMMER_OFF_SHORT_MASK)) 744 745 /* 746 * Record types are fairly straightforward. The B-Tree includes the record 747 * type in its index sort. 748 */ 749 #define HAMMER_RECTYPE_UNKNOWN 0x0000 750 #define HAMMER_RECTYPE_LOWEST 0x0001 /* lowest record type avail */ 751 #define HAMMER_RECTYPE_INODE 0x0001 /* inode in obj_id space */ 752 #define HAMMER_RECTYPE_DATA 0x0010 753 #define HAMMER_RECTYPE_DIRENTRY 0x0011 754 #define HAMMER_RECTYPE_DB 0x0012 755 #define HAMMER_RECTYPE_EXT 0x0013 /* ext attributes */ 756 #define HAMMER_RECTYPE_FIX 0x0014 /* fixed attribute */ 757 #define HAMMER_RECTYPE_PFS 0x0015 /* PFS management */ 758 #define HAMMER_RECTYPE_SNAPSHOT 0x0016 /* Snapshot management */ 759 #define HAMMER_RECTYPE_CONFIG 0x0017 /* hammer cleanup config */ 760 #define HAMMER_RECTYPE_MAX 0xFFFF 761 762 #define HAMMER_RECTYPE_ENTRY_START (HAMMER_RECTYPE_INODE + 1) 763 #define HAMMER_RECTYPE_CLEAN_START HAMMER_RECTYPE_EXT 764 765 #define HAMMER_FIXKEY_SYMLINK 1 766 767 #define HAMMER_OBJTYPE_UNKNOWN 0 /* never exists on-disk as unknown */ 768 #define HAMMER_OBJTYPE_DIRECTORY 1 769 #define HAMMER_OBJTYPE_REGFILE 2 770 #define HAMMER_OBJTYPE_DBFILE 3 771 #define HAMMER_OBJTYPE_FIFO 4 772 #define HAMMER_OBJTYPE_CDEV 5 773 #define HAMMER_OBJTYPE_BDEV 6 774 #define HAMMER_OBJTYPE_SOFTLINK 7 775 #define HAMMER_OBJTYPE_PSEUDOFS 8 /* pseudo filesystem obj */ 776 #define HAMMER_OBJTYPE_SOCKET 9 777 778 /* 779 * HAMMER inode attribute data 780 * 781 * The data reference for a HAMMER inode points to this structure. Any 782 * modifications to the contents of this structure will result in a 783 * replacement operation. 784 * 785 * parent_obj_id is only valid for directories (which cannot be hard-linked), 786 * and specifies the parent directory obj_id. This field will also be set 787 * for non-directory inodes as a recovery aid, but can wind up holding 788 * stale information. However, since object id's are not reused, the worse 789 * that happens is that the recovery code is unable to use it. 790 * A parent_obj_id of 0 means it's a root inode of root or non-root PFS. 791 * 792 * NOTE: Future note on directory hardlinks. We can implement a record type 793 * which allows us to point to multiple parent directories. 794 */ 795 struct hammer_inode_data { 796 uint16_t version; /* inode data version */ 797 uint16_t mode; /* basic unix permissions */ 798 uint32_t uflags; /* chflags */ 799 uint32_t rmajor; /* used by device nodes */ 800 uint32_t rminor; /* used by device nodes */ 801 uint64_t ctime; 802 int64_t parent_obj_id; /* parent directory obj_id */ 803 uuid_t uid; 804 uuid_t gid; 805 806 uint8_t obj_type; 807 uint8_t cap_flags; /* capability support flags (extension) */ 808 uint16_t reserved01; 809 uint32_t reserved02; /* RESERVED FOR POSSIBLE FUTURE BIRTHTIME */ 810 uint64_t nlinks; /* hard links */ 811 uint64_t size; /* filesystem object size */ 812 union { 813 char symlink[24]; /* HAMMER_INODE_BASESYMLEN */ 814 } ext; 815 uint64_t mtime; /* mtime must be second-to-last */ 816 uint64_t atime; /* atime must be last */ 817 }; 818 819 /* 820 * Neither mtime nor atime upates are CRCd by the B-Tree element. 821 * mtime updates have UNDO, atime updates do not. 822 */ 823 #define HAMMER_INODE_CRCSIZE \ 824 offsetof(struct hammer_inode_data, mtime) 825 826 #define HAMMER_INODE_DATA_VERSION 1 827 #define HAMMER_OBJID_ROOT 1 /* root inodes # */ 828 #define HAMMER_INODE_BASESYMLEN 24 /* see ext.symlink */ 829 830 /* 831 * Capability & implementation flags. 832 * 833 * HAMMER_INODE_CAP_DIR_LOCAL_INO - Use inode B-Tree localization 834 * for directory entries. Also see HAMMER_DIR_INODE_LOCALIZATION(). 835 */ 836 #define HAMMER_INODE_CAP_DIRHASH_MASK 0x03 /* directory: hash algorithm */ 837 #define HAMMER_INODE_CAP_DIRHASH_ALG0 0x00 838 #define HAMMER_INODE_CAP_DIRHASH_ALG1 0x01 839 #define HAMMER_INODE_CAP_DIRHASH_ALG2 0x02 840 #define HAMMER_INODE_CAP_DIRHASH_ALG3 0x03 841 #define HAMMER_INODE_CAP_DIR_LOCAL_INO 0x04 /* use inode localization */ 842 843 /* 844 * A HAMMER directory entry associates a HAMMER filesystem object with a 845 * namespace. It is possible to hook into a pseudo-filesystem (with its 846 * own inode numbering space) in the filesystem by setting the high 847 * 16 bits of the localization field. The low 16 bits must be 0 and 848 * are reserved for future use. 849 * 850 * Directory entries are indexed with a 128 bit namekey rather then an 851 * offset. A portion of the namekey is an iterator/randomizer to deal 852 * with collisions. 853 * 854 * NOTE: leaf.base.obj_type from the related B-Tree leaf entry holds 855 * the filesystem object type of obj_id, e.g. a den_type equivalent. 856 * It is not stored in hammer_direntry_data. 857 * 858 * NOTE: name field / the filename data reference is NOT terminated with \0. 859 */ 860 struct hammer_direntry_data { 861 int64_t obj_id; /* object being referenced */ 862 uint32_t localization; /* identify pseudo-filesystem */ 863 uint32_t reserved02; 864 char name[16]; /* name (extended) */ 865 }; 866 867 #define HAMMER_ENTRY_NAME_OFF offsetof(struct hammer_direntry_data, name[0]) 868 #define HAMMER_ENTRY_SIZE(nlen) offsetof(struct hammer_direntry_data, name[nlen]) 869 870 /* 871 * Symlink data which does not fit in the inode is stored in a separate 872 * FIX type record. 873 */ 874 struct hammer_symlink_data { 875 char name[16]; /* name (extended) */ 876 }; 877 878 #define HAMMER_SYMLINK_NAME_OFF offsetof(struct hammer_symlink_data, name[0]) 879 880 /* 881 * The root inode for the primary filesystem and root inode for any 882 * pseudo-fs may be tagged with an optional data structure using 883 * HAMMER_RECTYPE_PFS and localization id. This structure allows 884 * the node to be used as a mirroring master or slave. 885 * 886 * When operating as a slave CD's into the node automatically become read-only 887 * and as-of sync_end_tid. 888 * 889 * When operating as a master the read PFSD info sets sync_end_tid to 890 * the most recently flushed TID. 891 * 892 * sync_low_tid is not yet used but will represent the highest pruning 893 * end-point, after which full history is available. 894 * 895 * We need to pack this structure making it equally sized on both 32-bit and 896 * 64-bit machines as it is part of struct hammer_ioc_mrecord_pfs which is 897 * send over the wire in hammer mirror operations. Only on 64-bit machines 898 * the size of this struct differ when packed or not. This leads us to the 899 * situation where old 64-bit systems (using the non-packed structure), 900 * which were never able to mirror to/from 32-bit systems, are now no longer 901 * able to mirror to/from newer 64-bit systems (using the packed structure). 902 */ 903 struct hammer_pseudofs_data { 904 hammer_tid_t sync_low_tid; /* full history beyond this point */ 905 hammer_tid_t sync_beg_tid; /* earliest tid w/ full history avail */ 906 hammer_tid_t sync_end_tid; /* current synchronizatoin point */ 907 uint64_t sync_beg_ts; /* real-time of last completed sync */ 908 uint64_t sync_end_ts; /* initiation of current sync cycle */ 909 uuid_t shared_uuid; /* shared uuid (match required) */ 910 uuid_t unique_uuid; /* unique uuid of this master/slave */ 911 int32_t reserved01; /* reserved for future master_id */ 912 int32_t mirror_flags; /* misc flags */ 913 char label[64]; /* filesystem space label */ 914 char snapshots[64]; /* softlink dir for pruning */ 915 int32_t reserved02; /* was prune_{time,freq} */ 916 int32_t reserved03; /* was reblock_{time,freq} */ 917 int32_t reserved04; /* was snapshot_freq */ 918 int32_t prune_min; /* do not prune recent history */ 919 int32_t prune_max; /* do not retain history beyond here */ 920 int32_t reserved[16]; 921 } __packed; 922 923 typedef struct hammer_pseudofs_data *hammer_pseudofs_data_t; 924 925 #define HAMMER_PFSD_SLAVE 0x00000001 926 #define HAMMER_PFSD_DELETED 0x80000000 927 928 #define hammer_is_pfs_slave(pfsd) \ 929 (((pfsd)->mirror_flags & HAMMER_PFSD_SLAVE) != 0) 930 #define hammer_is_pfs_master(pfsd) \ 931 (!hammer_is_pfs_slave(pfsd)) 932 #define hammer_is_pfs_deleted(pfsd) \ 933 (((pfsd)->mirror_flags & HAMMER_PFSD_DELETED) != 0) 934 935 #define HAMMER_MAX_PFS 65536 936 #define HAMMER_MAX_PFSID (HAMMER_MAX_PFS - 1) 937 #define HAMMER_ROOT_PFSID 0 938 939 /* 940 * Snapshot meta-data { Objid = HAMMER_OBJID_ROOT, Key = tid, rectype = SNAPSHOT }. 941 * 942 * Snapshot records replace the old <fs>/snapshots/<softlink> methodology. Snapshot 943 * records are mirrored but may be independantly managed once they are laid down on 944 * a slave. 945 * 946 * NOTE: The b-tree key is signed, the tid is not, so callers must still sort the 947 * results. 948 * 949 * NOTE: Reserved fields must be zero (as usual) 950 */ 951 struct hammer_snapshot_data { 952 hammer_tid_t tid; /* the snapshot TID itself (== key) */ 953 uint64_t ts; /* real-time when snapshot was made */ 954 uint64_t reserved01; 955 uint64_t reserved02; 956 char label[64]; /* user-supplied description */ 957 uint64_t reserved03[4]; 958 }; 959 960 /* 961 * Config meta-data { ObjId = HAMMER_OBJID_ROOT, Key = 0, rectype = CONFIG }. 962 * 963 * Used to store the hammer cleanup config. This data is not mirrored. 964 */ 965 struct hammer_config_data { 966 char text[1024]; 967 }; 968 969 /* 970 * Rollup various structures embedded as record data 971 */ 972 union hammer_data_ondisk { 973 struct hammer_direntry_data entry; 974 struct hammer_inode_data inode; 975 struct hammer_symlink_data symlink; 976 struct hammer_pseudofs_data pfsd; 977 struct hammer_snapshot_data snap; 978 struct hammer_config_data config; 979 }; 980 981 typedef union hammer_data_ondisk *hammer_data_ondisk_t; 982 983 /* 984 * Ondisk layout of B-Tree related structures 985 */ 986 #include "hammer_btree.h" 987 988 #define HAMMER_DIR_INODE_LOCALIZATION(ino_data) \ 989 (((ino_data)->cap_flags & HAMMER_INODE_CAP_DIR_LOCAL_INO) ? \ 990 HAMMER_LOCALIZE_INODE : \ 991 HAMMER_LOCALIZE_MISC) 992 993 #endif /* !VFS_HAMMER_DISK_H_ */ 994