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 #include <sys/endian.h> 41 42 #ifndef _SYS_UUID_H_ 43 #include <sys/uuid.h> 44 #endif 45 46 /* 47 * The structures below represent the on-disk format for a HAMMER 48 * filesystem. Note that all fields for on-disk structures are naturally 49 * aligned. HAMMER uses little endian for fields in on-disk structures. 50 * HAMMER doesn't support big endian arch, but is planned. 51 * 52 * Most of HAMMER revolves around the concept of an object identifier. An 53 * obj_id is a 64 bit quantity which uniquely identifies a filesystem object 54 * FOR THE ENTIRE LIFE OF THE FILESYSTEM. This uniqueness allows backups 55 * and mirrors to retain varying amounts of filesystem history by removing 56 * any possibility of conflict through identifier reuse. 57 * 58 * A HAMMER filesystem may span multiple volumes. 59 * 60 * A HAMMER filesystem uses a 16K filesystem buffer size. All filesystem 61 * I/O is done in multiples of 16K. 62 * 63 * 64K X-bufs are used for blocks >= a file's 1MB mark. 64 * 65 * Per-volume storage limit: 52 bits 4096 TB 66 * Per-Zone storage limit: 60 bits 1 MTB 67 * Per-filesystem storage limit: 60 bits 1 MTB 68 */ 69 #define HAMMER_BUFSIZE 16384 70 #define HAMMER_XBUFSIZE 65536 71 #define HAMMER_HBUFSIZE (HAMMER_BUFSIZE / 2) 72 #define HAMMER_XDEMARC (1024 * 1024) 73 #define HAMMER_BUFMASK (HAMMER_BUFSIZE - 1) 74 #define HAMMER_XBUFMASK (HAMMER_XBUFSIZE - 1) 75 76 #define HAMMER_BUFSIZE64 ((uint64_t)HAMMER_BUFSIZE) 77 #define HAMMER_BUFMASK64 ((uint64_t)HAMMER_BUFMASK) 78 79 #define HAMMER_XBUFSIZE64 ((uint64_t)HAMMER_XBUFSIZE) 80 #define HAMMER_XBUFMASK64 ((uint64_t)HAMMER_XBUFMASK) 81 82 #define HAMMER_OFF_ZONE_MASK 0xF000000000000000ULL /* zone portion */ 83 #define HAMMER_OFF_VOL_MASK 0x0FF0000000000000ULL /* volume portion */ 84 #define HAMMER_OFF_SHORT_MASK 0x000FFFFFFFFFFFFFULL /* offset portion */ 85 #define HAMMER_OFF_LONG_MASK 0x0FFFFFFFFFFFFFFFULL /* offset portion */ 86 87 #define HAMMER_OFF_BAD ((hammer_off_t)-1) 88 89 #define HAMMER_BUFSIZE_DOALIGN(offset) \ 90 (((offset) + HAMMER_BUFMASK) & ~HAMMER_BUFMASK) 91 #define HAMMER_BUFSIZE64_DOALIGN(offset) \ 92 (((offset) + HAMMER_BUFMASK64) & ~HAMMER_BUFMASK64) 93 94 #define HAMMER_XBUFSIZE_DOALIGN(offset) \ 95 (((offset) + HAMMER_XBUFMASK) & ~HAMMER_XBUFMASK) 96 #define HAMMER_XBUFSIZE64_DOALIGN(offset) \ 97 (((offset) + HAMMER_XBUFMASK64) & ~HAMMER_XBUFMASK64) 98 99 /* 100 * The current limit of volumes that can make up a HAMMER FS 101 */ 102 #define HAMMER_MAX_VOLUMES 256 103 104 /* 105 * Reserved space for (future) header junk after the volume header. 106 */ 107 #define HAMMER_MIN_VOL_JUNK (HAMMER_BUFSIZE * 16) /* 256 KB */ 108 #define HAMMER_MAX_VOL_JUNK HAMMER_MIN_VOL_JUNK 109 #define HAMMER_VOL_JUNK_SIZE HAMMER_MIN_VOL_JUNK 110 111 /* 112 * Hammer transaction ids are 64 bit unsigned integers and are usually 113 * synchronized with the time of day in nanoseconds. 114 * 115 * Hammer offsets are used for FIFO indexing and embed a cycle counter 116 * and volume number in addition to the offset. Most offsets are required 117 * to be 16 KB aligned. 118 */ 119 typedef uint64_t hammer_tid_t; 120 typedef uint64_t hammer_off_t; 121 typedef uint32_t hammer_crc_t; 122 typedef uuid_t hammer_uuid_t; 123 124 #define HAMMER_MIN_TID 0ULL /* unsigned */ 125 #define HAMMER_MAX_TID 0xFFFFFFFFFFFFFFFFULL /* unsigned */ 126 #define HAMMER_MIN_KEY -0x8000000000000000LL /* signed */ 127 #define HAMMER_MAX_KEY 0x7FFFFFFFFFFFFFFFLL /* signed */ 128 #define HAMMER_MIN_OBJID HAMMER_MIN_KEY /* signed */ 129 #define HAMMER_MAX_OBJID HAMMER_MAX_KEY /* signed */ 130 #define HAMMER_MIN_RECTYPE 0x0U /* unsigned */ 131 #define HAMMER_MAX_RECTYPE 0xFFFFU /* unsigned */ 132 #define HAMMER_MIN_OFFSET 0ULL /* unsigned */ 133 #define HAMMER_MAX_OFFSET 0xFFFFFFFFFFFFFFFFULL /* unsigned */ 134 135 /* 136 * hammer_off_t has several different encodings. Note that not all zones 137 * encode a vol_no. Zone bits are not a part of filesystem capacity as 138 * the zone bits aren't directly or indirectly mapped to physical volumes. 139 * 140 * In other words, HAMMER's logical filesystem offset consists of 64 bits, 141 * but the filesystem is considered 60 bits filesystem, not 64 bits. 142 * The maximum filesystem capacity is 1EB, not 16EB. 143 * 144 * zone 0: available, a big-block that contains the offset is unused 145 * zone 1 (z,v,o): raw volume relative (offset 0 is the volume header) 146 * zone 2 (z,v,o): raw buffer relative (offset 0 is the first buffer) 147 * zone 3 (z,o): undo/redo fifo - fixed zone-2 offset array in volume header 148 * zone 4 (z,v,o): freemap - only real blockmap 149 * zone 8 (z,v,o): B-Tree - actually zone-2 address 150 * zone 9 (z,v,o): meta - actually zone-2 address 151 * zone 10 (z,v,o): large-data - actually zone-2 address 152 * zone 11 (z,v,o): small-data - actually zone-2 address 153 * zone 15: unavailable, usually the offset is beyond volume size 154 * 155 * layer1/layer2 direct map: 156 * Maximum HAMMER filesystem capacity from volume aspect 157 * 2^8(max volumes) * 2^52(max volume size) = 2^60 = 1EB (long offset) 158 * <-------------------------------------------------------------> 159 * 8bits 52bits (short offset) 160 * <------><-----------------------------------------------------> 161 * zzzzvvvvvvvvoooo oooooooooooooooo oooooooooooooooo oooooooooooooooo 162 * ----111111111111 1111112222222222 222222222ooooooo oooooooooooooooo 163 * <-----------------><------------------><----------------------> 164 * 18bits 19bits 23bits 165 * <-------------------------------------------------------------> 166 * 2^18(layer1) * 2^19(layer2) * 2^23(big-block) = 2^60 = 1EB 167 * Maximum HAMMER filesystem capacity from blockmap aspect 168 * 169 * volume#0 layout 170 * +-------------------------> offset 0 of a device/partition 171 * | volume header (1928 bytes) 172 * | the rest of header junk space (HAMMER_BUFSIZE aligned) 173 * +-------------------------> vol_bot_beg 174 * | boot area (HAMMER_BUFSIZE aligned) 175 * +-------------------------> vol_mem_beg 176 * | memory log (HAMMER_BUFSIZE aligned) 177 * +-------------------------> vol_buf_beg (physical offset of zone-2) 178 * | zone-4 big-block for layer1 179 * +-------------------------> vol_buf_beg + HAMMER_BIGBLOCK_SIZE 180 * | zone-4 big-blocks for layer2 181 * | ... (1 big-block per 4TB space) 182 * +-------------------------> vol_buf_beg + HAMMER_BIGBLOCK_SIZE * ... 183 * | zone-3 big-blocks for UNDO/REDO FIFO 184 * | ... (max 128 big-blocks) 185 * +-------------------------> vol_buf_beg + HAMMER_BIGBLOCK_SIZE * ... 186 * | zone-8 big-block for root B-Tree node/etc 187 * +-------------------------> vol_buf_beg + HAMMER_BIGBLOCK_SIZE * ... 188 * | zone-9 big-block for root inode/PFS/etc 189 * +-------------------------> vol_buf_beg + HAMMER_BIGBLOCK_SIZE * ... 190 * | zone-X big-blocks 191 * | ... (big-blocks for new zones after newfs_hammer) 192 * | ... 193 * | ... 194 * | ... 195 * | ... 196 * +-------------------------> vol_buf_end (HAMMER_BUFSIZE aligned) 197 * +-------------------------> end of a device/partition 198 * 199 * volume#N layout (0<N<256) 200 * +-------------------------> offset 0 of a device/partition 201 * | volume header (1928 bytes) 202 * | the rest of header junk space (HAMMER_BUFSIZE aligned) 203 * +-------------------------> vol_bot_beg 204 * | boot area (HAMMER_BUFSIZE aligned) 205 * +-------------------------> vol_mem_beg 206 * | memory log (HAMMER_BUFSIZE aligned) 207 * +-------------------------> vol_buf_beg (physical offset of zone-2) 208 * | zone-4 big-blocks for layer2 209 * | ... (1 big-block per 4TB space) 210 * +-------------------------> vol_buf_beg + HAMMER_BIGBLOCK_SIZE * ... 211 * | zone-X big-blocks 212 * | ... (unused until volume#(N-1) runs out of space) 213 * | ... 214 * | ... 215 * | ... 216 * | ... 217 * +-------------------------> vol_buf_end (HAMMER_BUFSIZE aligned) 218 * +-------------------------> end of a device/partition 219 */ 220 221 #define HAMMER_ZONE_RAW_VOLUME 0x1000000000000000ULL 222 #define HAMMER_ZONE_RAW_BUFFER 0x2000000000000000ULL 223 #define HAMMER_ZONE_UNDO 0x3000000000000000ULL 224 #define HAMMER_ZONE_FREEMAP 0x4000000000000000ULL 225 #define HAMMER_ZONE_RESERVED05 0x5000000000000000ULL /* not used */ 226 #define HAMMER_ZONE_RESERVED06 0x6000000000000000ULL /* not used */ 227 #define HAMMER_ZONE_RESERVED07 0x7000000000000000ULL /* not used */ 228 #define HAMMER_ZONE_BTREE 0x8000000000000000ULL 229 #define HAMMER_ZONE_META 0x9000000000000000ULL 230 #define HAMMER_ZONE_LARGE_DATA 0xA000000000000000ULL 231 #define HAMMER_ZONE_SMALL_DATA 0xB000000000000000ULL 232 #define HAMMER_ZONE_RESERVED0C 0xC000000000000000ULL /* not used */ 233 #define HAMMER_ZONE_RESERVED0D 0xD000000000000000ULL /* not used */ 234 #define HAMMER_ZONE_RESERVED0E 0xE000000000000000ULL /* not used */ 235 #define HAMMER_ZONE_UNAVAIL 0xF000000000000000ULL 236 237 #define HAMMER_ZONE_RAW_VOLUME_INDEX 1 238 #define HAMMER_ZONE_RAW_BUFFER_INDEX 2 239 #define HAMMER_ZONE_UNDO_INDEX 3 240 #define HAMMER_ZONE_FREEMAP_INDEX 4 241 #define HAMMER_ZONE_BTREE_INDEX 8 242 #define HAMMER_ZONE_META_INDEX 9 243 #define HAMMER_ZONE_LARGE_DATA_INDEX 10 244 #define HAMMER_ZONE_SMALL_DATA_INDEX 11 245 #define HAMMER_ZONE_UNAVAIL_INDEX 15 246 247 #define HAMMER_MAX_ZONES 16 248 249 #define HAMMER_ZONE(offset) ((offset) & HAMMER_OFF_ZONE_MASK) 250 251 #define hammer_is_zone_raw_volume(offset) \ 252 (HAMMER_ZONE(offset) == HAMMER_ZONE_RAW_VOLUME) 253 #define hammer_is_zone_raw_buffer(offset) \ 254 (HAMMER_ZONE(offset) == HAMMER_ZONE_RAW_BUFFER) 255 #define hammer_is_zone_undo(offset) \ 256 (HAMMER_ZONE(offset) == HAMMER_ZONE_UNDO) 257 #define hammer_is_zone_freemap(offset) \ 258 (HAMMER_ZONE(offset) == HAMMER_ZONE_FREEMAP) 259 #define hammer_is_zone_btree(offset) \ 260 (HAMMER_ZONE(offset) == HAMMER_ZONE_BTREE) 261 #define hammer_is_zone_meta(offset) \ 262 (HAMMER_ZONE(offset) == HAMMER_ZONE_META) 263 #define hammer_is_zone_large_data(offset) \ 264 (HAMMER_ZONE(offset) == HAMMER_ZONE_LARGE_DATA) 265 #define hammer_is_zone_small_data(offset) \ 266 (HAMMER_ZONE(offset) == HAMMER_ZONE_SMALL_DATA) 267 #define hammer_is_zone_unavail(offset) \ 268 (HAMMER_ZONE(offset) == HAMMER_ZONE_UNAVAIL) 269 #define hammer_is_zone_data(offset) \ 270 (hammer_is_zone_large_data(offset) || hammer_is_zone_small_data(offset)) 271 272 #define hammer_is_index_record(zone) \ 273 ((zone) >= HAMMER_ZONE_BTREE_INDEX && \ 274 (zone) < HAMMER_MAX_ZONES) 275 276 #define hammer_is_zone_record(offset) \ 277 hammer_is_index_record(HAMMER_ZONE_DECODE(offset)) 278 279 #define hammer_is_index_direct_xlated(zone) \ 280 (((zone) == HAMMER_ZONE_RAW_BUFFER_INDEX) || \ 281 ((zone) == HAMMER_ZONE_FREEMAP_INDEX) || \ 282 hammer_is_index_record(zone)) 283 284 #define hammer_is_zone_direct_xlated(offset) \ 285 hammer_is_index_direct_xlated(HAMMER_ZONE_DECODE(offset)) 286 287 #define HAMMER_ZONE_ENCODE(zone, ham_off) \ 288 (((hammer_off_t)(zone) << 60) | (ham_off)) 289 #define HAMMER_ZONE_DECODE(ham_off) \ 290 ((int)(((hammer_off_t)(ham_off) >> 60))) 291 292 #define HAMMER_VOL_ENCODE(vol_no) \ 293 ((hammer_off_t)((vol_no) & 255) << 52) 294 #define HAMMER_VOL_DECODE(ham_off) \ 295 ((int)(((hammer_off_t)(ham_off) >> 52) & 255)) 296 297 #define HAMMER_OFF_SHORT_ENCODE(offset) \ 298 ((hammer_off_t)(offset) & HAMMER_OFF_SHORT_MASK) 299 #define HAMMER_OFF_LONG_ENCODE(offset) \ 300 ((hammer_off_t)(offset) & HAMMER_OFF_LONG_MASK) 301 302 #define HAMMER_ENCODE(zone, vol_no, offset) \ 303 (((hammer_off_t)(zone) << 60) | \ 304 HAMMER_VOL_ENCODE(vol_no) | \ 305 HAMMER_OFF_SHORT_ENCODE(offset)) 306 #define HAMMER_ENCODE_RAW_VOLUME(vol_no, offset) \ 307 HAMMER_ENCODE(HAMMER_ZONE_RAW_VOLUME_INDEX, vol_no, offset) 308 #define HAMMER_ENCODE_RAW_BUFFER(vol_no, offset) \ 309 HAMMER_ENCODE(HAMMER_ZONE_RAW_BUFFER_INDEX, vol_no, offset) 310 #define HAMMER_ENCODE_UNDO(offset) \ 311 HAMMER_ENCODE(HAMMER_ZONE_UNDO_INDEX, HAMMER_ROOT_VOLNO, offset) 312 #define HAMMER_ENCODE_FREEMAP(vol_no, offset) \ 313 HAMMER_ENCODE(HAMMER_ZONE_FREEMAP_INDEX, vol_no, offset) 314 315 /* 316 * Translate a zone address to zone-X address. 317 */ 318 #define hammer_xlate_to_zoneX(zone, offset) \ 319 HAMMER_ZONE_ENCODE((zone), (offset) & ~HAMMER_OFF_ZONE_MASK) 320 #define hammer_xlate_to_zone2(offset) \ 321 hammer_xlate_to_zoneX(HAMMER_ZONE_RAW_BUFFER_INDEX, (offset)) 322 323 #define hammer_data_zone(data_len) \ 324 (((data_len) >= HAMMER_BUFSIZE) ? \ 325 HAMMER_ZONE_LARGE_DATA : \ 326 HAMMER_ZONE_SMALL_DATA) 327 #define hammer_data_zone_index(data_len) \ 328 (((data_len) >= HAMMER_BUFSIZE) ? \ 329 HAMMER_ZONE_LARGE_DATA_INDEX : \ 330 HAMMER_ZONE_SMALL_DATA_INDEX) 331 332 /* 333 * Big-Block backing store 334 * 335 * A blockmap is a two-level map which translates a blockmap-backed zone 336 * offset into a raw zone 2 offset. The layer 1 handles 18 bits and the 337 * layer 2 handles 19 bits. The 8M big-block size is 23 bits so two 338 * layers gives us 18+19+23 = 60 bits of address space. 339 * 340 * When using hinting for a blockmap lookup, the hint is lost when the 341 * scan leaves the HINTBLOCK, which is typically several BIGBLOCK's. 342 * HINTBLOCK is a heuristic. 343 */ 344 #define HAMMER_HINTBLOCK_SIZE (HAMMER_BIGBLOCK_SIZE * 4) 345 #define HAMMER_HINTBLOCK_MASK64 ((uint64_t)HAMMER_HINTBLOCK_SIZE - 1) 346 #define HAMMER_BIGBLOCK_SIZE (8192 * 1024) 347 #define HAMMER_BIGBLOCK_SIZE64 ((uint64_t)HAMMER_BIGBLOCK_SIZE) 348 #define HAMMER_BIGBLOCK_MASK (HAMMER_BIGBLOCK_SIZE - 1) 349 #define HAMMER_BIGBLOCK_MASK64 ((uint64_t)HAMMER_BIGBLOCK_SIZE - 1) 350 #define HAMMER_BIGBLOCK_BITS 23 351 #if 0 352 #define HAMMER_BIGBLOCK_OVERFILL (6144 * 1024) 353 #endif 354 #if (1 << HAMMER_BIGBLOCK_BITS) != HAMMER_BIGBLOCK_SIZE 355 #error "HAMMER_BIGBLOCK_BITS BROKEN" 356 #endif 357 358 #define HAMMER_BUFFERS_PER_BIGBLOCK \ 359 (HAMMER_BIGBLOCK_SIZE / HAMMER_BUFSIZE) 360 #define HAMMER_BUFFERS_PER_BIGBLOCK_MASK \ 361 (HAMMER_BUFFERS_PER_BIGBLOCK - 1) 362 #define HAMMER_BUFFERS_PER_BIGBLOCK_MASK64 \ 363 ((hammer_off_t)HAMMER_BUFFERS_PER_BIGBLOCK_MASK) 364 365 #define HAMMER_BIGBLOCK_DOALIGN(offset) \ 366 (((offset) + HAMMER_BIGBLOCK_MASK64) & ~HAMMER_BIGBLOCK_MASK64) 367 368 /* 369 * Maximum number of mirrors operating in master mode (multi-master 370 * clustering and mirroring). Note that HAMMER1 does not support 371 * multi-master clustering as of 2015. 372 */ 373 #define HAMMER_MAX_MASTERS 16 374 375 /* 376 * The blockmap is somewhat of a degenerate structure. HAMMER only actually 377 * uses it in its original incarnation to implement the freemap. 378 * 379 * zone:1 raw volume (no blockmap) 380 * zone:2 raw buffer (no blockmap) 381 * zone:3 undomap (direct layer2 array in volume header) 382 * zone:4 freemap (the only real blockmap) 383 * zone:8-15 zone id used to classify big-block only, address is actually 384 * a zone-2 address. 385 */ 386 typedef struct hammer_blockmap { 387 hammer_off_t phys_offset; /* zone-2 offset only used by zone-4 */ 388 hammer_off_t first_offset; /* zone-X offset only used by zone-3 */ 389 hammer_off_t next_offset; /* zone-X offset for allocation */ 390 hammer_off_t alloc_offset; /* zone-X offset only used by zone-3 */ 391 uint32_t reserved01; 392 hammer_crc_t entry_crc; 393 } *hammer_blockmap_t; 394 395 #define HAMMER_BLOCKMAP_CRCSIZE \ 396 offsetof(struct hammer_blockmap, entry_crc) 397 398 /* 399 * The blockmap is a 2-layer entity made up of big-blocks. The first layer 400 * contains 262144 32-byte entries (18 bits), the second layer contains 401 * 524288 16-byte entries (19 bits), representing 8MB (23 bit) blockmaps. 402 * 18+19+23 = 60 bits. The top four bits are the zone id. 403 * 404 * Currently only the freemap utilizes both layers in all their glory. 405 * All primary data/meta-data zones actually encode a zone-2 address 406 * requiring no real blockmap translation. 407 * 408 * The freemap uses the upper 8 bits of layer-1 to identify the volume, 409 * thus any space allocated via the freemap can be directly translated 410 * to a zone:2 (or zone:8-15) address. 411 * 412 * zone-X blockmap offset: [zone:4][layer1:18][layer2:19][big-block:23] 413 */ 414 415 /* 416 * 32 bytes layer1 entry for 8MB big-block. 417 * A big-block can hold 2^23 / 2^5 = 2^18 layer1 entries, 418 * which equals bits assigned for layer1 in zone-2 address. 419 */ 420 typedef struct hammer_blockmap_layer1 { 421 hammer_off_t blocks_free; /* big-blocks free */ 422 hammer_off_t phys_offset; /* UNAVAIL or zone-2 */ 423 hammer_off_t reserved01; 424 hammer_crc_t layer2_crc; /* xor'd crc's of HAMMER_BLOCKSIZE */ 425 /* (not yet used) */ 426 hammer_crc_t layer1_crc; /* MUST BE LAST FIELD OF STRUCTURE*/ 427 } *hammer_blockmap_layer1_t; 428 429 #define HAMMER_LAYER1_CRCSIZE \ 430 offsetof(struct hammer_blockmap_layer1, layer1_crc) 431 432 /* 433 * 16 bytes layer2 entry for 8MB big-blocks. 434 * A big-block can hold 2^23 / 2^4 = 2^19 layer2 entries, 435 * which equals bits assigned for layer2 in zone-2 address. 436 * 437 * NOTE: bytes_free is signed and can legally go negative if/when data 438 * de-dup occurs. This field will never go higher than 439 * HAMMER_BIGBLOCK_SIZE. If exactly HAMMER_BIGBLOCK_SIZE 440 * the big-block is completely free. 441 */ 442 typedef struct hammer_blockmap_layer2 { 443 uint8_t zone; /* typed allocation zone */ 444 uint8_t reserved01; 445 uint16_t reserved02; 446 uint32_t append_off; /* allocatable space index */ 447 int32_t bytes_free; /* bytes free within this big-block */ 448 hammer_crc_t entry_crc; 449 } *hammer_blockmap_layer2_t; 450 451 #define HAMMER_LAYER2_CRCSIZE \ 452 offsetof(struct hammer_blockmap_layer2, entry_crc) 453 454 #define HAMMER_BLOCKMAP_UNAVAIL ((hammer_off_t)-1LL) 455 456 #define HAMMER_BLOCKMAP_RADIX1 /* 2^18 = 262144 */ \ 457 ((int)(HAMMER_BIGBLOCK_SIZE / sizeof(struct hammer_blockmap_layer1))) 458 #define HAMMER_BLOCKMAP_RADIX2 /* 2^19 = 524288 */ \ 459 ((int)(HAMMER_BIGBLOCK_SIZE / sizeof(struct hammer_blockmap_layer2))) 460 461 #define HAMMER_BLOCKMAP_LAYER1 /* 2^(18+19+23) = 1EB */ \ 462 (HAMMER_BLOCKMAP_RADIX1 * HAMMER_BLOCKMAP_LAYER2) 463 #define HAMMER_BLOCKMAP_LAYER2 /* 2^(19+23) = 4TB */ \ 464 (HAMMER_BLOCKMAP_RADIX2 * HAMMER_BIGBLOCK_SIZE64) 465 466 #define HAMMER_BLOCKMAP_LAYER1_MASK (HAMMER_BLOCKMAP_LAYER1 - 1) 467 #define HAMMER_BLOCKMAP_LAYER2_MASK (HAMMER_BLOCKMAP_LAYER2 - 1) 468 469 #define HAMMER_BLOCKMAP_LAYER2_DOALIGN(offset) \ 470 (((offset) + HAMMER_BLOCKMAP_LAYER2_MASK) & \ 471 ~HAMMER_BLOCKMAP_LAYER2_MASK) 472 473 /* 474 * Index within layer1 or layer2 big-block for the entry representing 475 * a zone-2 physical offset. 476 */ 477 #define HAMMER_BLOCKMAP_LAYER1_INDEX(zone2_offset) \ 478 ((int)(((zone2_offset) & HAMMER_BLOCKMAP_LAYER1_MASK) / \ 479 HAMMER_BLOCKMAP_LAYER2)) 480 481 #define HAMMER_BLOCKMAP_LAYER2_INDEX(zone2_offset) \ 482 ((int)(((zone2_offset) & HAMMER_BLOCKMAP_LAYER2_MASK) / \ 483 HAMMER_BIGBLOCK_SIZE64)) 484 485 /* 486 * Byte offset within layer1 or layer2 big-block for the entry representing 487 * a zone-2 physical offset. Multiply the index by sizeof(blockmap_layer). 488 */ 489 #define HAMMER_BLOCKMAP_LAYER1_OFFSET(zone2_offset) \ 490 (HAMMER_BLOCKMAP_LAYER1_INDEX(zone2_offset) * \ 491 sizeof(struct hammer_blockmap_layer1)) 492 493 #define HAMMER_BLOCKMAP_LAYER2_OFFSET(zone2_offset) \ 494 (HAMMER_BLOCKMAP_LAYER2_INDEX(zone2_offset) * \ 495 sizeof(struct hammer_blockmap_layer2)) 496 497 /* 498 * Move on to offset 0 of the next layer1 or layer2. 499 */ 500 #define HAMMER_ZONE_LAYER1_NEXT_OFFSET(offset) \ 501 (((offset) + HAMMER_BLOCKMAP_LAYER2) & ~HAMMER_BLOCKMAP_LAYER2_MASK) 502 503 #define HAMMER_ZONE_LAYER2_NEXT_OFFSET(offset) \ 504 (((offset) + HAMMER_BIGBLOCK_SIZE) & ~HAMMER_BIGBLOCK_MASK64) 505 506 /* 507 * HAMMER UNDO parameters. The UNDO fifo is mapped directly in the volume 508 * header with an array of zone-2 offsets. A maximum of (128x8MB) = 1GB, 509 * and minimum of (64x8MB) = 512MB may be reserved. The size of the undo 510 * fifo is usually set a newfs time. 511 */ 512 #define HAMMER_MIN_UNDO_BIGBLOCKS 64 513 #define HAMMER_MAX_UNDO_BIGBLOCKS 128 514 515 /* 516 * All on-disk HAMMER structures which make up elements of the UNDO FIFO 517 * contain a hammer_fifo_head and hammer_fifo_tail structure. This structure 518 * contains all the information required to validate the fifo element 519 * and to scan the fifo in either direction. The head is typically embedded 520 * in higher level hammer on-disk structures while the tail is typically 521 * out-of-band. hdr_size is the size of the whole mess, including the tail. 522 * 523 * All undo structures are guaranteed to not cross a 16K filesystem 524 * buffer boundary. Most undo structures are fairly small. Data spaces 525 * are not immediately reused by HAMMER so file data is not usually recorded 526 * as part of an UNDO. 527 * 528 * PAD elements are allowed to take up only 8 bytes of space as a special 529 * case, containing only hdr_signature, hdr_type, and hdr_size fields, 530 * and with the tail overloaded onto the head structure for 8 bytes total. 531 * 532 * Every undo record has a sequence number. This number is unrelated to 533 * transaction ids and instead collects the undo transactions associated 534 * with a single atomic operation. A larger transactional operation, such 535 * as a remove(), may consist of several smaller atomic operations 536 * representing raw meta-data operations. 537 * 538 * HAMMER VERSION 4 CHANGES 539 * 540 * In HAMMER version 4 the undo structure alignment is reduced from 16384 541 * to 512 bytes in order to ensure that each 512 byte sector begins with 542 * a header. The hdr_seq field in the header is a 32 bit sequence number 543 * which allows the recovery code to detect missing sectors 544 * without relying on the 32-bit crc and to definitively identify the current 545 * undo sequence space without having to rely on information from the volume 546 * header. In addition, new REDO entries in the undo space are used to 547 * record write, write/extend, and transaction id updates. 548 * 549 * The grand result is: 550 * 551 * (1) The volume header no longer needs to be synchronized for most 552 * flush and fsync operations. 553 * 554 * (2) Most fsync operations need only lay down REDO records 555 * 556 * (3) Data overwrite for nohistory operations covered by REDO records 557 * can be supported (instead of rolling a new block allocation), 558 * by rolling UNDO for the prior contents of the data. 559 * 560 * HAMMER VERSION 5 CHANGES 561 * 562 * Hammer version 5 contains a minor adjustment making layer2's bytes_free 563 * field signed, allowing dedup to push it into the negative domain. 564 */ 565 #define HAMMER_HEAD_ALIGN 8 566 #define HAMMER_HEAD_ALIGN_MASK (HAMMER_HEAD_ALIGN - 1) 567 #define HAMMER_HEAD_DOALIGN(bytes) \ 568 (((bytes) + HAMMER_HEAD_ALIGN_MASK) & ~HAMMER_HEAD_ALIGN_MASK) 569 570 #define HAMMER_UNDO_ALIGN 512 571 #define HAMMER_UNDO_ALIGN64 ((uint64_t)512) 572 #define HAMMER_UNDO_MASK (HAMMER_UNDO_ALIGN - 1) 573 #define HAMMER_UNDO_MASK64 (HAMMER_UNDO_ALIGN64 - 1) 574 #define HAMMER_UNDO_DOALIGN(offset) \ 575 (((offset) + HAMMER_UNDO_MASK) & ~HAMMER_UNDO_MASK64) 576 577 typedef struct hammer_fifo_head { 578 uint16_t hdr_signature; 579 uint16_t hdr_type; 580 uint32_t hdr_size; /* Aligned size of the whole mess */ 581 uint32_t hdr_seq; /* Sequence number */ 582 hammer_crc_t hdr_crc; /* XOR crc up to field w/ crc after field */ 583 } *hammer_fifo_head_t; 584 585 #define HAMMER_FIFO_HEAD_CRCOFF offsetof(struct hammer_fifo_head, hdr_crc) 586 587 typedef struct hammer_fifo_tail { 588 uint16_t tail_signature; 589 uint16_t tail_type; 590 uint32_t tail_size; /* aligned size of the whole mess */ 591 } *hammer_fifo_tail_t; 592 593 /* 594 * Fifo header types. 595 * 596 * NOTE: 0x8000U part of HAMMER_HEAD_TYPE_PAD can be removed if the HAMMER 597 * version ever gets bumped again. It exists only to keep compatibility with 598 * older versions. 599 */ 600 #define HAMMER_HEAD_TYPE_PAD (0x0040U | 0x8000U) 601 #define HAMMER_HEAD_TYPE_DUMMY 0x0041U /* dummy entry w/seqno */ 602 #define HAMMER_HEAD_TYPE_UNDO 0x0043U /* random UNDO information */ 603 #define HAMMER_HEAD_TYPE_REDO 0x0044U /* data REDO / fast fsync */ 604 605 #define HAMMER_HEAD_SIGNATURE 0xC84EU 606 #define HAMMER_TAIL_SIGNATURE 0xC74FU 607 608 /* 609 * Misc FIFO structures. 610 * 611 * UNDO - Raw meta-data media updates. 612 */ 613 typedef struct hammer_fifo_undo { 614 struct hammer_fifo_head head; 615 hammer_off_t undo_offset; /* zone-1,2 offset */ 616 int32_t undo_data_bytes; 617 int32_t undo_reserved01; 618 /* followed by data */ 619 } *hammer_fifo_undo_t; 620 621 /* 622 * REDO (HAMMER version 4+) - Logical file writes/truncates. 623 * 624 * REDOs contain information which will be duplicated in a later meta-data 625 * update, allowing fast write()+fsync() operations. REDOs can be ignored 626 * without harming filesystem integrity but must be processed if fsync() 627 * semantics are desired. 628 * 629 * Unlike UNDOs which are processed backwards within the recovery span, 630 * REDOs must be processed forwards starting further back (starting outside 631 * the recovery span). 632 * 633 * WRITE - Write logical file (with payload). Executed both 634 * out-of-span and in-span. Out-of-span WRITEs may be 635 * filtered out by TERMs. 636 * 637 * TRUNC - Truncate logical file (no payload). Executed both 638 * out-of-span and in-span. Out-of-span WRITEs may be 639 * filtered out by TERMs. 640 * 641 * TERM_* - Indicates meta-data was committed (if out-of-span) or 642 * will be rolled-back (in-span). Any out-of-span TERMs 643 * matching earlier WRITEs remove those WRITEs from 644 * consideration as they might conflict with a later data 645 * commit (which is not being rolled-back). 646 * 647 * SYNC - The earliest in-span SYNC (the last one when scanning 648 * backwards) tells the recovery code how far out-of-span 649 * it must go to run REDOs. 650 * 651 * NOTE: WRITEs do not always have matching TERMs even under 652 * perfect conditions because truncations might remove the 653 * buffers from consideration. I/O problems can also remove 654 * buffers from consideration. 655 * 656 * TRUNCSs do not always have matching TERMs because several 657 * truncations may be aggregated together into a single TERM. 658 */ 659 typedef struct hammer_fifo_redo { 660 struct hammer_fifo_head head; 661 int64_t redo_objid; /* file being written */ 662 hammer_off_t redo_offset; /* logical offset in file */ 663 int32_t redo_data_bytes; 664 uint32_t redo_flags; 665 uint32_t redo_localization; 666 uint32_t redo_reserved01; 667 uint64_t redo_reserved02; 668 /* followed by data */ 669 } *hammer_fifo_redo_t; 670 671 #define HAMMER_REDO_WRITE 0x00000001 672 #define HAMMER_REDO_TRUNC 0x00000002 673 #define HAMMER_REDO_TERM_WRITE 0x00000004 674 #define HAMMER_REDO_TERM_TRUNC 0x00000008 675 #define HAMMER_REDO_SYNC 0x00000010 676 677 typedef union hammer_fifo_any { 678 struct hammer_fifo_head head; 679 struct hammer_fifo_undo undo; 680 struct hammer_fifo_redo redo; 681 } *hammer_fifo_any_t; 682 683 /* 684 * Volume header types 685 */ 686 #define HAMMER_FSBUF_VOLUME 0xC8414D4DC5523031ULL /* HAMMER01 */ 687 #define HAMMER_FSBUF_VOLUME_REV 0x313052C54D4D41C8ULL /* (reverse endian) */ 688 689 /* 690 * HAMMER Volume header 691 * 692 * A HAMMER filesystem can be built from 1-256 block devices, each block 693 * device contains a volume header followed by however many buffers fit 694 * into the volume. 695 * 696 * One of the volumes making up a HAMMER filesystem is the root volume. 697 * The root volume is always volume #0 which is the first block device path 698 * specified by newfs_hammer(8). All HAMMER volumes have a volume header, 699 * however the root volume may be the only volume that has valid values for 700 * some fields in the header. 701 * 702 * Special field notes: 703 * 704 * vol_bot_beg - offset of boot area (mem_beg - bot_beg bytes) 705 * vol_mem_beg - offset of memory log (buf_beg - mem_beg bytes) 706 * vol_buf_beg - offset of the first buffer in volume 707 * vol_buf_end - offset of volume EOF (on buffer boundary) 708 * 709 * The memory log area allows a kernel to cache new records and data 710 * in memory without allocating space in the actual filesystem to hold 711 * the records and data. In the event that a filesystem becomes full, 712 * any records remaining in memory can be flushed to the memory log 713 * area. This allows the kernel to immediately return success. 714 * 715 * The buffer offset is a physical offset of zone-2 offset. The lower 716 * 52 bits of the zone-2 offset is added to the buffer offset of each 717 * volume to generate an actual I/O offset within the block device. 718 * 719 * NOTE: boot area and memory log are currently not used. 720 */ 721 722 /* 723 * Filesystem type string 724 */ 725 #define HAMMER_FSTYPE_STRING "DragonFly HAMMER" 726 727 /* 728 * These macros are only used by userspace when userspace commands either 729 * initialize or add a new HAMMER volume. 730 */ 731 #define HAMMER_BOOT_MINBYTES (32*1024) 732 #define HAMMER_BOOT_NOMBYTES (64LL*1024*1024) 733 #define HAMMER_BOOT_MAXBYTES (256LL*1024*1024) 734 735 #define HAMMER_MEM_MINBYTES (256*1024) 736 #define HAMMER_MEM_NOMBYTES (1LL*1024*1024*1024) 737 #define HAMMER_MEM_MAXBYTES (64LL*1024*1024*1024) 738 739 typedef struct hammer_volume_ondisk { 740 uint64_t vol_signature; /* HAMMER_FSBUF_VOLUME for a valid header */ 741 742 /* 743 * These are relative to block device offset, not zone offsets. 744 */ 745 int64_t vol_bot_beg; /* offset of boot area */ 746 int64_t vol_mem_beg; /* offset of memory log */ 747 int64_t vol_buf_beg; /* offset of the first buffer in volume */ 748 int64_t vol_buf_end; /* offset of volume EOF (on buffer boundary) */ 749 int64_t vol_reserved01; 750 751 hammer_uuid_t vol_fsid; /* identify filesystem */ 752 hammer_uuid_t vol_fstype; /* identify filesystem type */ 753 char vol_label[64]; /* filesystem label */ 754 755 int32_t vol_no; /* volume number within filesystem */ 756 int32_t vol_count; /* number of volumes making up filesystem */ 757 758 uint32_t vol_version; /* version control information */ 759 hammer_crc_t vol_crc; /* header crc */ 760 uint32_t vol_flags; /* volume flags */ 761 uint32_t vol_rootvol; /* the root volume number (must be 0) */ 762 763 uint32_t vol_reserved[8]; 764 765 /* 766 * These fields are initialized and space is reserved in every 767 * volume making up a HAMMER filesytem, but only the root volume 768 * contains valid data. Note that vol0_stat_bigblocks does not 769 * include big-blocks for freemap and undomap initially allocated 770 * by newfs_hammer(8). 771 */ 772 int64_t vol0_stat_bigblocks; /* total big-blocks when fs is empty */ 773 int64_t vol0_stat_freebigblocks;/* number of free big-blocks */ 774 int64_t vol0_reserved01; 775 int64_t vol0_stat_inodes; /* for statfs only */ 776 int64_t vol0_reserved02; 777 hammer_off_t vol0_btree_root; /* B-Tree root offset in zone-8 */ 778 hammer_tid_t vol0_next_tid; /* highest partially synchronized TID */ 779 hammer_off_t vol0_reserved03; 780 781 /* 782 * Blockmaps for zones. Not all zones use a blockmap. Note that 783 * the entire root blockmap is cached in the hammer_mount structure. 784 */ 785 struct hammer_blockmap vol0_blockmap[HAMMER_MAX_ZONES]; 786 787 /* 788 * Array of zone-2 addresses for undo FIFO. 789 */ 790 hammer_off_t vol0_undo_array[HAMMER_MAX_UNDO_BIGBLOCKS]; 791 } *hammer_volume_ondisk_t; 792 793 #define HAMMER_ROOT_VOLNO 0 794 795 #define HAMMER_VOLF_NEEDFLUSH 0x0004 /* volume needs flush */ 796 797 #define HAMMER_VOL_CRCSIZE1 \ 798 offsetof(struct hammer_volume_ondisk, vol_crc) 799 #define HAMMER_VOL_CRCSIZE2 \ 800 (sizeof(struct hammer_volume_ondisk) - HAMMER_VOL_CRCSIZE1 - \ 801 sizeof(hammer_crc_t)) 802 803 #define HAMMER_VOL_VERSION_MIN 1 /* minimum supported version */ 804 #define HAMMER_VOL_VERSION_DEFAULT 7 /* newfs default version */ 805 #define HAMMER_VOL_VERSION_WIP 8 /* version >= this is WIP */ 806 #define HAMMER_VOL_VERSION_MAX 7 /* maximum supported version */ 807 808 #define HAMMER_VOL_VERSION_ONE 1 809 #define HAMMER_VOL_VERSION_TWO 2 /* new dirent layout (2.3+) */ 810 #define HAMMER_VOL_VERSION_THREE 3 /* new snapshot layout (2.5+) */ 811 #define HAMMER_VOL_VERSION_FOUR 4 /* new undo/flush (2.5+) */ 812 #define HAMMER_VOL_VERSION_FIVE 5 /* dedup (2.9+) */ 813 #define HAMMER_VOL_VERSION_SIX 6 /* DIRHASH_ALG1 */ 814 #define HAMMER_VOL_VERSION_SEVEN 7 /* use the faster iscsi_crc */ 815 816 /* 817 * Translate a zone-2 address to physical address 818 */ 819 #define hammer_xlate_to_phys(volume, zone2_offset) \ 820 ((volume)->vol_buf_beg + HAMMER_OFF_SHORT_ENCODE(zone2_offset)) 821 822 /* 823 * Translate a zone-3 address to zone-2 address 824 */ 825 #define HAMMER_UNDO_INDEX(zone3_offset) \ 826 (HAMMER_OFF_SHORT_ENCODE(zone3_offset) / HAMMER_BIGBLOCK_SIZE) 827 828 #define hammer_xlate_to_undo(volume, zone3_offset) \ 829 ((volume)->vol0_undo_array[HAMMER_UNDO_INDEX(zone3_offset)] + \ 830 (zone3_offset & HAMMER_BIGBLOCK_MASK64)) 831 832 /* 833 * Effective per-volume filesystem capacity including big-blocks for layer1/2 834 */ 835 #define HAMMER_VOL_BUF_SIZE(volume) \ 836 ((volume)->vol_buf_end - (volume)->vol_buf_beg) 837 838 /* 839 * Record types are fairly straightforward. The B-Tree includes the record 840 * type in its index sort. 841 */ 842 #define HAMMER_RECTYPE_UNKNOWN 0x0000 843 #define HAMMER_RECTYPE_INODE 0x0001 /* inode in obj_id space */ 844 #define HAMMER_RECTYPE_DATA 0x0010 845 #define HAMMER_RECTYPE_DIRENTRY 0x0011 846 #define HAMMER_RECTYPE_DB 0x0012 847 #define HAMMER_RECTYPE_EXT 0x0013 /* ext attributes */ 848 #define HAMMER_RECTYPE_FIX 0x0014 /* fixed attribute */ 849 #define HAMMER_RECTYPE_PFS 0x0015 /* PFS management */ 850 #define HAMMER_RECTYPE_SNAPSHOT 0x0016 /* Snapshot management */ 851 #define HAMMER_RECTYPE_CONFIG 0x0017 /* hammer cleanup config */ 852 #define HAMMER_RECTYPE_MAX 0xFFFF 853 854 #define HAMMER_RECTYPE_ENTRY_START (HAMMER_RECTYPE_INODE + 1) 855 #define HAMMER_RECTYPE_CLEAN_START HAMMER_RECTYPE_EXT 856 857 #define HAMMER_FIXKEY_SYMLINK 1 858 859 #define HAMMER_OBJTYPE_UNKNOWN 0 /* never exists on-disk as unknown */ 860 #define HAMMER_OBJTYPE_DIRECTORY 1 861 #define HAMMER_OBJTYPE_REGFILE 2 862 #define HAMMER_OBJTYPE_DBFILE 3 863 #define HAMMER_OBJTYPE_FIFO 4 864 #define HAMMER_OBJTYPE_CDEV 5 865 #define HAMMER_OBJTYPE_BDEV 6 866 #define HAMMER_OBJTYPE_SOFTLINK 7 867 #define HAMMER_OBJTYPE_PSEUDOFS 8 /* pseudo filesystem obj */ 868 #define HAMMER_OBJTYPE_SOCKET 9 869 870 /* 871 * HAMMER inode attribute data 872 * 873 * The data reference for a HAMMER inode points to this structure. Any 874 * modifications to the contents of this structure will result in a 875 * replacement operation. 876 * 877 * parent_obj_id is only valid for directories (which cannot be hard-linked), 878 * and specifies the parent directory obj_id. This field will also be set 879 * for non-directory inodes as a recovery aid, but can wind up holding 880 * stale information. However, since object id's are not reused, the worse 881 * that happens is that the recovery code is unable to use it. 882 * A parent_obj_id of 0 means it's a root inode of root or non-root PFS. 883 * 884 * NOTE: Future note on directory hardlinks. We can implement a record type 885 * which allows us to point to multiple parent directories. 886 */ 887 typedef struct hammer_inode_data { 888 uint16_t version; /* inode data version */ 889 uint16_t mode; /* basic unix permissions */ 890 uint32_t uflags; /* chflags */ 891 uint32_t rmajor; /* used by device nodes */ 892 uint32_t rminor; /* used by device nodes */ 893 uint64_t ctime; 894 int64_t parent_obj_id; /* parent directory obj_id */ 895 hammer_uuid_t uid; 896 hammer_uuid_t gid; 897 898 uint8_t obj_type; 899 uint8_t cap_flags; /* capability support flags (extension) */ 900 uint16_t reserved01; 901 uint32_t reserved02; 902 uint64_t nlinks; /* hard links */ 903 uint64_t size; /* filesystem object size */ 904 union { 905 char symlink[24]; /* HAMMER_INODE_BASESYMLEN */ 906 } ext; 907 uint64_t mtime; /* mtime must be second-to-last */ 908 uint64_t atime; /* atime must be last */ 909 } *hammer_inode_data_t; 910 911 /* 912 * Neither mtime nor atime upates are CRCd by the B-Tree element. 913 * mtime updates have UNDO, atime updates do not. 914 */ 915 #define HAMMER_INODE_CRCSIZE \ 916 offsetof(struct hammer_inode_data, mtime) 917 918 #define HAMMER_INODE_DATA_VERSION 1 919 #define HAMMER_OBJID_ROOT 1 /* root inodes # */ 920 #define HAMMER_INODE_BASESYMLEN 24 /* see ext.symlink */ 921 922 /* 923 * Capability & implementation flags. 924 * 925 * HAMMER_INODE_CAP_DIR_LOCAL_INO - Use inode B-Tree localization 926 * for directory entries. Also see HAMMER_DIR_INODE_LOCALIZATION(). 927 */ 928 #define HAMMER_INODE_CAP_DIRHASH_MASK 0x03 /* directory: hash algorithm */ 929 #define HAMMER_INODE_CAP_DIRHASH_ALG0 0x00 930 #define HAMMER_INODE_CAP_DIRHASH_ALG1 0x01 931 #define HAMMER_INODE_CAP_DIRHASH_ALG2 0x02 932 #define HAMMER_INODE_CAP_DIRHASH_ALG3 0x03 933 #define HAMMER_INODE_CAP_DIR_LOCAL_INO 0x04 /* use inode localization */ 934 935 #define HAMMER_DATA_DOALIGN(offset) \ 936 (((offset) + 15) & ~15) 937 #define HAMMER_DATA_DOALIGN_WITH(type, offset) \ 938 (((type)(offset) + 15) & (~(type)15)) 939 940 /* 941 * A HAMMER directory entry associates a HAMMER filesystem object with a 942 * namespace. It is hooked into a pseudo-filesystem (with its own inode 943 * numbering space) in the filesystem by setting the high 16 bits of the 944 * localization field. The low 16 bits must be 0 and are reserved for 945 * future use. 946 * 947 * Directory entries are indexed with a 128 bit namekey rather then an 948 * offset. A portion of the namekey is an iterator/randomizer to deal 949 * with collisions. 950 * 951 * NOTE: leaf.base.obj_type from the related B-Tree leaf entry holds 952 * the filesystem object type of obj_id, e.g. a den_type equivalent. 953 * It is not stored in hammer_direntry_data. 954 * 955 * NOTE: name field / the filename data reference is NOT terminated with \0. 956 */ 957 typedef struct hammer_direntry_data { 958 int64_t obj_id; /* object being referenced */ 959 uint32_t localization; /* identify pseudo-filesystem */ 960 uint32_t reserved01; 961 char name[16]; /* name (extended) */ 962 } *hammer_direntry_data_t; 963 964 #define HAMMER_ENTRY_NAME_OFF offsetof(struct hammer_direntry_data, name[0]) 965 #define HAMMER_ENTRY_SIZE(nlen) offsetof(struct hammer_direntry_data, name[nlen]) 966 967 /* 968 * Symlink data which does not fit in the inode is stored in a separate 969 * FIX type record. 970 */ 971 typedef struct hammer_symlink_data { 972 char name[16]; /* name (extended) */ 973 } *hammer_symlink_data_t; 974 975 #define HAMMER_SYMLINK_NAME_OFF offsetof(struct hammer_symlink_data, name[0]) 976 977 /* 978 * The root inode for the primary filesystem and root inode for any 979 * pseudo-fs may be tagged with an optional data structure using 980 * HAMMER_RECTYPE_PFS and localization id. This structure allows 981 * the node to be used as a mirroring master or slave. 982 * 983 * When operating as a slave CD's into the node automatically become read-only 984 * and as-of sync_end_tid. 985 * 986 * When operating as a master the read PFSD info sets sync_end_tid to 987 * the most recently flushed TID. 988 * 989 * sync_low_tid is not yet used but will represent the highest pruning 990 * end-point, after which full history is available. 991 * 992 * We need to pack this structure making it equally sized on both 32-bit and 993 * 64-bit machines as it is part of struct hammer_ioc_mrecord_pfs which is 994 * send over the wire in hammer mirror operations. Only on 64-bit machines 995 * the size of this struct differ when packed or not. This leads us to the 996 * situation where old 64-bit systems (using the non-packed structure), 997 * which were never able to mirror to/from 32-bit systems, are now no longer 998 * able to mirror to/from newer 64-bit systems (using the packed structure). 999 */ 1000 struct hammer_pseudofs_data { 1001 hammer_tid_t sync_low_tid; /* full history beyond this point */ 1002 hammer_tid_t sync_beg_tid; /* earliest tid w/ full history avail */ 1003 hammer_tid_t sync_end_tid; /* current synchronizatoin point */ 1004 uint64_t sync_beg_ts; /* real-time of last completed sync */ 1005 uint64_t sync_end_ts; /* initiation of current sync cycle */ 1006 hammer_uuid_t shared_uuid; /* shared uuid (match required) */ 1007 hammer_uuid_t unique_uuid; /* unique uuid of this master/slave */ 1008 int32_t reserved01; /* reserved for future master_id */ 1009 int32_t mirror_flags; /* misc flags */ 1010 char label[64]; /* filesystem space label */ 1011 char snapshots[64]; /* softlink dir for pruning */ 1012 int32_t reserved02; /* was prune_{time,freq} */ 1013 int32_t reserved03; /* was reblock_{time,freq} */ 1014 int32_t reserved04; /* was snapshot_freq */ 1015 int32_t prune_min; /* do not prune recent history */ 1016 int32_t prune_max; /* do not retain history beyond here */ 1017 int32_t reserved[16]; 1018 } __packed; 1019 1020 typedef struct hammer_pseudofs_data *hammer_pseudofs_data_t; 1021 1022 #define HAMMER_PFSD_SLAVE 0x00000001 1023 #define HAMMER_PFSD_DELETED 0x80000000 1024 1025 #define hammer_is_pfs_slave(pfsd) \ 1026 (((pfsd)->mirror_flags & HAMMER_PFSD_SLAVE) != 0) 1027 #define hammer_is_pfs_master(pfsd) \ 1028 (!hammer_is_pfs_slave(pfsd)) 1029 #define hammer_is_pfs_deleted(pfsd) \ 1030 (((pfsd)->mirror_flags & HAMMER_PFSD_DELETED) != 0) 1031 1032 #define HAMMER_MAX_PFS 65536 1033 #define HAMMER_MAX_PFSID (HAMMER_MAX_PFS - 1) 1034 #define HAMMER_ROOT_PFSID 0 1035 1036 /* 1037 * Snapshot meta-data { Objid = HAMMER_OBJID_ROOT, Key = tid, rectype = SNAPSHOT }. 1038 * 1039 * Snapshot records replace the old <fs>/snapshots/<softlink> methodology. Snapshot 1040 * records are mirrored but may be independantly managed once they are laid down on 1041 * a slave. 1042 * 1043 * NOTE: The b-tree key is signed, the tid is not, so callers must still sort the 1044 * results. 1045 * 1046 * NOTE: Reserved fields must be zero (as usual) 1047 */ 1048 typedef struct hammer_snapshot_data { 1049 hammer_tid_t tid; /* the snapshot TID itself (== key) */ 1050 uint64_t ts; /* real-time when snapshot was made */ 1051 uint64_t reserved01; 1052 uint64_t reserved02; 1053 char label[64]; /* user-supplied description */ 1054 uint64_t reserved03[4]; 1055 } *hammer_snapshot_data_t; 1056 1057 /* 1058 * Config meta-data { ObjId = HAMMER_OBJID_ROOT, Key = 0, rectype = CONFIG }. 1059 * 1060 * Used to store the hammer cleanup config. This data is not mirrored. 1061 */ 1062 typedef struct hammer_config_data { 1063 char text[1024]; 1064 } *hammer_config_data_t; 1065 1066 /* 1067 * Rollup various structures embedded as record data 1068 */ 1069 typedef union hammer_data_ondisk { 1070 struct hammer_direntry_data entry; 1071 struct hammer_inode_data inode; 1072 struct hammer_symlink_data symlink; 1073 struct hammer_pseudofs_data pfsd; 1074 struct hammer_snapshot_data snap; 1075 struct hammer_config_data config; 1076 } *hammer_data_ondisk_t; 1077 1078 /* 1079 * Ondisk layout of B-Tree related structures 1080 */ 1081 #include "hammer_btree.h" 1082 1083 #define HAMMER_DIR_INODE_LOCALIZATION(ino_data) \ 1084 (((ino_data)->cap_flags & HAMMER_INODE_CAP_DIR_LOCAL_INO) ? \ 1085 HAMMER_LOCALIZE_INODE : \ 1086 HAMMER_LOCALIZE_MISC) 1087 1088 #endif /* !VFS_HAMMER_DISK_H_ */ 1089