1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc. 4 * All Rights Reserved. 5 */ 6 #ifndef __XFS_BTREE_H__ 7 #define __XFS_BTREE_H__ 8 9 struct xfs_buf; 10 struct xfs_inode; 11 struct xfs_mount; 12 struct xfs_trans; 13 14 extern kmem_zone_t *xfs_btree_cur_zone; 15 16 /* 17 * Generic key, ptr and record wrapper structures. 18 * 19 * These are disk format structures, and are converted where necessary 20 * by the btree specific code that needs to interpret them. 21 */ 22 union xfs_btree_ptr { 23 __be32 s; /* short form ptr */ 24 __be64 l; /* long form ptr */ 25 }; 26 27 /* 28 * The in-core btree key. Overlapping btrees actually store two keys 29 * per pointer, so we reserve enough memory to hold both. The __*bigkey 30 * items should never be accessed directly. 31 */ 32 union xfs_btree_key { 33 struct xfs_bmbt_key bmbt; 34 xfs_bmdr_key_t bmbr; /* bmbt root block */ 35 xfs_alloc_key_t alloc; 36 struct xfs_inobt_key inobt; 37 struct xfs_rmap_key rmap; 38 struct xfs_rmap_key __rmap_bigkey[2]; 39 struct xfs_refcount_key refc; 40 }; 41 42 union xfs_btree_rec { 43 struct xfs_bmbt_rec bmbt; 44 xfs_bmdr_rec_t bmbr; /* bmbt root block */ 45 struct xfs_alloc_rec alloc; 46 struct xfs_inobt_rec inobt; 47 struct xfs_rmap_rec rmap; 48 struct xfs_refcount_rec refc; 49 }; 50 51 /* 52 * This nonsense is to make -wlint happy. 53 */ 54 #define XFS_LOOKUP_EQ ((xfs_lookup_t)XFS_LOOKUP_EQi) 55 #define XFS_LOOKUP_LE ((xfs_lookup_t)XFS_LOOKUP_LEi) 56 #define XFS_LOOKUP_GE ((xfs_lookup_t)XFS_LOOKUP_GEi) 57 58 #define XFS_BTNUM_BNO ((xfs_btnum_t)XFS_BTNUM_BNOi) 59 #define XFS_BTNUM_CNT ((xfs_btnum_t)XFS_BTNUM_CNTi) 60 #define XFS_BTNUM_BMAP ((xfs_btnum_t)XFS_BTNUM_BMAPi) 61 #define XFS_BTNUM_INO ((xfs_btnum_t)XFS_BTNUM_INOi) 62 #define XFS_BTNUM_FINO ((xfs_btnum_t)XFS_BTNUM_FINOi) 63 #define XFS_BTNUM_RMAP ((xfs_btnum_t)XFS_BTNUM_RMAPi) 64 #define XFS_BTNUM_REFC ((xfs_btnum_t)XFS_BTNUM_REFCi) 65 66 uint32_t xfs_btree_magic(int crc, xfs_btnum_t btnum); 67 68 /* 69 * For logging record fields. 70 */ 71 #define XFS_BB_MAGIC (1 << 0) 72 #define XFS_BB_LEVEL (1 << 1) 73 #define XFS_BB_NUMRECS (1 << 2) 74 #define XFS_BB_LEFTSIB (1 << 3) 75 #define XFS_BB_RIGHTSIB (1 << 4) 76 #define XFS_BB_BLKNO (1 << 5) 77 #define XFS_BB_LSN (1 << 6) 78 #define XFS_BB_UUID (1 << 7) 79 #define XFS_BB_OWNER (1 << 8) 80 #define XFS_BB_NUM_BITS 5 81 #define XFS_BB_ALL_BITS ((1 << XFS_BB_NUM_BITS) - 1) 82 #define XFS_BB_NUM_BITS_CRC 9 83 #define XFS_BB_ALL_BITS_CRC ((1 << XFS_BB_NUM_BITS_CRC) - 1) 84 85 /* 86 * Generic stats interface 87 */ 88 #define XFS_BTREE_STATS_INC(cur, stat) \ 89 XFS_STATS_INC_OFF((cur)->bc_mp, (cur)->bc_statoff + __XBTS_ ## stat) 90 #define XFS_BTREE_STATS_ADD(cur, stat, val) \ 91 XFS_STATS_ADD_OFF((cur)->bc_mp, (cur)->bc_statoff + __XBTS_ ## stat, val) 92 93 #define XFS_BTREE_MAXLEVELS 9 /* max of all btrees */ 94 95 struct xfs_btree_ops { 96 /* size of the key and record structures */ 97 size_t key_len; 98 size_t rec_len; 99 100 /* cursor operations */ 101 struct xfs_btree_cur *(*dup_cursor)(struct xfs_btree_cur *); 102 void (*update_cursor)(struct xfs_btree_cur *src, 103 struct xfs_btree_cur *dst); 104 105 /* update btree root pointer */ 106 void (*set_root)(struct xfs_btree_cur *cur, 107 union xfs_btree_ptr *nptr, int level_change); 108 109 /* block allocation / freeing */ 110 int (*alloc_block)(struct xfs_btree_cur *cur, 111 union xfs_btree_ptr *start_bno, 112 union xfs_btree_ptr *new_bno, 113 int *stat); 114 int (*free_block)(struct xfs_btree_cur *cur, struct xfs_buf *bp); 115 116 /* update last record information */ 117 void (*update_lastrec)(struct xfs_btree_cur *cur, 118 struct xfs_btree_block *block, 119 union xfs_btree_rec *rec, 120 int ptr, int reason); 121 122 /* records in block/level */ 123 int (*get_minrecs)(struct xfs_btree_cur *cur, int level); 124 int (*get_maxrecs)(struct xfs_btree_cur *cur, int level); 125 126 /* records on disk. Matter for the root in inode case. */ 127 int (*get_dmaxrecs)(struct xfs_btree_cur *cur, int level); 128 129 /* init values of btree structures */ 130 void (*init_key_from_rec)(union xfs_btree_key *key, 131 union xfs_btree_rec *rec); 132 void (*init_rec_from_cur)(struct xfs_btree_cur *cur, 133 union xfs_btree_rec *rec); 134 void (*init_ptr_from_cur)(struct xfs_btree_cur *cur, 135 union xfs_btree_ptr *ptr); 136 void (*init_high_key_from_rec)(union xfs_btree_key *key, 137 union xfs_btree_rec *rec); 138 139 /* difference between key value and cursor value */ 140 int64_t (*key_diff)(struct xfs_btree_cur *cur, 141 union xfs_btree_key *key); 142 143 /* 144 * Difference between key2 and key1 -- positive if key1 > key2, 145 * negative if key1 < key2, and zero if equal. 146 */ 147 int64_t (*diff_two_keys)(struct xfs_btree_cur *cur, 148 union xfs_btree_key *key1, 149 union xfs_btree_key *key2); 150 151 const struct xfs_buf_ops *buf_ops; 152 153 /* check that k1 is lower than k2 */ 154 int (*keys_inorder)(struct xfs_btree_cur *cur, 155 union xfs_btree_key *k1, 156 union xfs_btree_key *k2); 157 158 /* check that r1 is lower than r2 */ 159 int (*recs_inorder)(struct xfs_btree_cur *cur, 160 union xfs_btree_rec *r1, 161 union xfs_btree_rec *r2); 162 }; 163 164 /* 165 * Reasons for the update_lastrec method to be called. 166 */ 167 #define LASTREC_UPDATE 0 168 #define LASTREC_INSREC 1 169 #define LASTREC_DELREC 2 170 171 172 union xfs_btree_irec { 173 struct xfs_alloc_rec_incore a; 174 struct xfs_bmbt_irec b; 175 struct xfs_inobt_rec_incore i; 176 struct xfs_rmap_irec r; 177 struct xfs_refcount_irec rc; 178 }; 179 180 /* Per-AG btree private information. */ 181 union xfs_btree_cur_private { 182 struct { 183 unsigned long nr_ops; /* # record updates */ 184 int shape_changes; /* # of extent splits */ 185 } refc; 186 }; 187 188 /* 189 * Btree cursor structure. 190 * This collects all information needed by the btree code in one place. 191 */ 192 typedef struct xfs_btree_cur 193 { 194 struct xfs_trans *bc_tp; /* transaction we're in, if any */ 195 struct xfs_mount *bc_mp; /* file system mount struct */ 196 const struct xfs_btree_ops *bc_ops; 197 uint bc_flags; /* btree features - below */ 198 union xfs_btree_irec bc_rec; /* current insert/search record value */ 199 struct xfs_buf *bc_bufs[XFS_BTREE_MAXLEVELS]; /* buf ptr per level */ 200 int bc_ptrs[XFS_BTREE_MAXLEVELS]; /* key/record # */ 201 uint8_t bc_ra[XFS_BTREE_MAXLEVELS]; /* readahead bits */ 202 #define XFS_BTCUR_LEFTRA 1 /* left sibling has been read-ahead */ 203 #define XFS_BTCUR_RIGHTRA 2 /* right sibling has been read-ahead */ 204 uint8_t bc_nlevels; /* number of levels in the tree */ 205 uint8_t bc_blocklog; /* log2(blocksize) of btree blocks */ 206 xfs_btnum_t bc_btnum; /* identifies which btree type */ 207 int bc_statoff; /* offset of btre stats array */ 208 union { 209 struct { /* needed for BNO, CNT, INO */ 210 struct xfs_buf *agbp; /* agf/agi buffer pointer */ 211 xfs_agnumber_t agno; /* ag number */ 212 union xfs_btree_cur_private priv; 213 } a; 214 struct { /* needed for BMAP */ 215 struct xfs_inode *ip; /* pointer to our inode */ 216 int allocated; /* count of alloced */ 217 short forksize; /* fork's inode space */ 218 char whichfork; /* data or attr fork */ 219 char flags; /* flags */ 220 #define XFS_BTCUR_BPRV_WASDEL (1<<0) /* was delayed */ 221 #define XFS_BTCUR_BPRV_INVALID_OWNER (1<<1) /* for ext swap */ 222 } b; 223 } bc_private; /* per-btree type data */ 224 } xfs_btree_cur_t; 225 226 /* cursor flags */ 227 #define XFS_BTREE_LONG_PTRS (1<<0) /* pointers are 64bits long */ 228 #define XFS_BTREE_ROOT_IN_INODE (1<<1) /* root may be variable size */ 229 #define XFS_BTREE_LASTREC_UPDATE (1<<2) /* track last rec externally */ 230 #define XFS_BTREE_CRC_BLOCKS (1<<3) /* uses extended btree blocks */ 231 #define XFS_BTREE_OVERLAPPING (1<<4) /* overlapping intervals */ 232 233 234 #define XFS_BTREE_NOERROR 0 235 #define XFS_BTREE_ERROR 1 236 237 /* 238 * Convert from buffer to btree block header. 239 */ 240 #define XFS_BUF_TO_BLOCK(bp) ((struct xfs_btree_block *)((bp)->b_addr)) 241 242 /* 243 * Internal long and short btree block checks. They return NULL if the 244 * block is ok or the address of the failed check otherwise. 245 */ 246 xfs_failaddr_t __xfs_btree_check_lblock(struct xfs_btree_cur *cur, 247 struct xfs_btree_block *block, int level, struct xfs_buf *bp); 248 xfs_failaddr_t __xfs_btree_check_sblock(struct xfs_btree_cur *cur, 249 struct xfs_btree_block *block, int level, struct xfs_buf *bp); 250 251 /* 252 * Check that block header is ok. 253 */ 254 int 255 xfs_btree_check_block( 256 struct xfs_btree_cur *cur, /* btree cursor */ 257 struct xfs_btree_block *block, /* generic btree block pointer */ 258 int level, /* level of the btree block */ 259 struct xfs_buf *bp); /* buffer containing block, if any */ 260 261 /* 262 * Check that (long) pointer is ok. 263 */ 264 bool /* error (0 or EFSCORRUPTED) */ 265 xfs_btree_check_lptr( 266 struct xfs_btree_cur *cur, /* btree cursor */ 267 xfs_fsblock_t fsbno, /* btree block disk address */ 268 int level); /* btree block level */ 269 270 /* 271 * Check that (short) pointer is ok. 272 */ 273 bool /* error (0 or EFSCORRUPTED) */ 274 xfs_btree_check_sptr( 275 struct xfs_btree_cur *cur, /* btree cursor */ 276 xfs_agblock_t agbno, /* btree block disk address */ 277 int level); /* btree block level */ 278 279 /* 280 * Delete the btree cursor. 281 */ 282 void 283 xfs_btree_del_cursor( 284 xfs_btree_cur_t *cur, /* btree cursor */ 285 int error); /* del because of error */ 286 287 /* 288 * Duplicate the btree cursor. 289 * Allocate a new one, copy the record, re-get the buffers. 290 */ 291 int /* error */ 292 xfs_btree_dup_cursor( 293 xfs_btree_cur_t *cur, /* input cursor */ 294 xfs_btree_cur_t **ncur);/* output cursor */ 295 296 /* 297 * Get a buffer for the block, return it with no data read. 298 * Long-form addressing. 299 */ 300 struct xfs_buf * /* buffer for fsbno */ 301 xfs_btree_get_bufl( 302 struct xfs_mount *mp, /* file system mount point */ 303 struct xfs_trans *tp, /* transaction pointer */ 304 xfs_fsblock_t fsbno); /* file system block number */ 305 306 /* 307 * Get a buffer for the block, return it with no data read. 308 * Short-form addressing. 309 */ 310 struct xfs_buf * /* buffer for agno/agbno */ 311 xfs_btree_get_bufs( 312 struct xfs_mount *mp, /* file system mount point */ 313 struct xfs_trans *tp, /* transaction pointer */ 314 xfs_agnumber_t agno, /* allocation group number */ 315 xfs_agblock_t agbno); /* allocation group block number */ 316 317 /* 318 * Check for the cursor referring to the last block at the given level. 319 */ 320 int /* 1=is last block, 0=not last block */ 321 xfs_btree_islastblock( 322 xfs_btree_cur_t *cur, /* btree cursor */ 323 int level); /* level to check */ 324 325 /* 326 * Compute first and last byte offsets for the fields given. 327 * Interprets the offsets table, which contains struct field offsets. 328 */ 329 void 330 xfs_btree_offsets( 331 int64_t fields, /* bitmask of fields */ 332 const short *offsets,/* table of field offsets */ 333 int nbits, /* number of bits to inspect */ 334 int *first, /* output: first byte offset */ 335 int *last); /* output: last byte offset */ 336 337 /* 338 * Get a buffer for the block, return it read in. 339 * Long-form addressing. 340 */ 341 int /* error */ 342 xfs_btree_read_bufl( 343 struct xfs_mount *mp, /* file system mount point */ 344 struct xfs_trans *tp, /* transaction pointer */ 345 xfs_fsblock_t fsbno, /* file system block number */ 346 struct xfs_buf **bpp, /* buffer for fsbno */ 347 int refval, /* ref count value for buffer */ 348 const struct xfs_buf_ops *ops); 349 350 /* 351 * Read-ahead the block, don't wait for it, don't return a buffer. 352 * Long-form addressing. 353 */ 354 void /* error */ 355 xfs_btree_reada_bufl( 356 struct xfs_mount *mp, /* file system mount point */ 357 xfs_fsblock_t fsbno, /* file system block number */ 358 xfs_extlen_t count, /* count of filesystem blocks */ 359 const struct xfs_buf_ops *ops); 360 361 /* 362 * Read-ahead the block, don't wait for it, don't return a buffer. 363 * Short-form addressing. 364 */ 365 void /* error */ 366 xfs_btree_reada_bufs( 367 struct xfs_mount *mp, /* file system mount point */ 368 xfs_agnumber_t agno, /* allocation group number */ 369 xfs_agblock_t agbno, /* allocation group block number */ 370 xfs_extlen_t count, /* count of filesystem blocks */ 371 const struct xfs_buf_ops *ops); 372 373 /* 374 * Initialise a new btree block header 375 */ 376 void 377 xfs_btree_init_block( 378 struct xfs_mount *mp, 379 struct xfs_buf *bp, 380 xfs_btnum_t btnum, 381 __u16 level, 382 __u16 numrecs, 383 __u64 owner); 384 385 void 386 xfs_btree_init_block_int( 387 struct xfs_mount *mp, 388 struct xfs_btree_block *buf, 389 xfs_daddr_t blkno, 390 xfs_btnum_t btnum, 391 __u16 level, 392 __u16 numrecs, 393 __u64 owner, 394 unsigned int flags); 395 396 /* 397 * Common btree core entry points. 398 */ 399 int xfs_btree_increment(struct xfs_btree_cur *, int, int *); 400 int xfs_btree_decrement(struct xfs_btree_cur *, int, int *); 401 int xfs_btree_lookup(struct xfs_btree_cur *, xfs_lookup_t, int *); 402 int xfs_btree_update(struct xfs_btree_cur *, union xfs_btree_rec *); 403 int xfs_btree_new_iroot(struct xfs_btree_cur *, int *, int *); 404 int xfs_btree_insert(struct xfs_btree_cur *, int *); 405 int xfs_btree_delete(struct xfs_btree_cur *, int *); 406 int xfs_btree_get_rec(struct xfs_btree_cur *, union xfs_btree_rec **, int *); 407 int xfs_btree_change_owner(struct xfs_btree_cur *cur, uint64_t new_owner, 408 struct list_head *buffer_list); 409 410 /* 411 * btree block CRC helpers 412 */ 413 void xfs_btree_lblock_calc_crc(struct xfs_buf *); 414 bool xfs_btree_lblock_verify_crc(struct xfs_buf *); 415 void xfs_btree_sblock_calc_crc(struct xfs_buf *); 416 bool xfs_btree_sblock_verify_crc(struct xfs_buf *); 417 418 /* 419 * Internal btree helpers also used by xfs_bmap.c. 420 */ 421 void xfs_btree_log_block(struct xfs_btree_cur *, struct xfs_buf *, int); 422 void xfs_btree_log_recs(struct xfs_btree_cur *, struct xfs_buf *, int, int); 423 424 /* 425 * Helpers. 426 */ 427 static inline int xfs_btree_get_numrecs(struct xfs_btree_block *block) 428 { 429 return be16_to_cpu(block->bb_numrecs); 430 } 431 432 static inline void xfs_btree_set_numrecs(struct xfs_btree_block *block, 433 uint16_t numrecs) 434 { 435 block->bb_numrecs = cpu_to_be16(numrecs); 436 } 437 438 static inline int xfs_btree_get_level(struct xfs_btree_block *block) 439 { 440 return be16_to_cpu(block->bb_level); 441 } 442 443 444 /* 445 * Min and max functions for extlen, agblock, fileoff, and filblks types. 446 */ 447 #define XFS_EXTLEN_MIN(a,b) min_t(xfs_extlen_t, (a), (b)) 448 #define XFS_EXTLEN_MAX(a,b) max_t(xfs_extlen_t, (a), (b)) 449 #define XFS_AGBLOCK_MIN(a,b) min_t(xfs_agblock_t, (a), (b)) 450 #define XFS_AGBLOCK_MAX(a,b) max_t(xfs_agblock_t, (a), (b)) 451 #define XFS_FILEOFF_MIN(a,b) min_t(xfs_fileoff_t, (a), (b)) 452 #define XFS_FILEOFF_MAX(a,b) max_t(xfs_fileoff_t, (a), (b)) 453 #define XFS_FILBLKS_MIN(a,b) min_t(xfs_filblks_t, (a), (b)) 454 #define XFS_FILBLKS_MAX(a,b) max_t(xfs_filblks_t, (a), (b)) 455 456 xfs_failaddr_t xfs_btree_sblock_v5hdr_verify(struct xfs_buf *bp); 457 xfs_failaddr_t xfs_btree_sblock_verify(struct xfs_buf *bp, 458 unsigned int max_recs); 459 xfs_failaddr_t xfs_btree_lblock_v5hdr_verify(struct xfs_buf *bp, 460 uint64_t owner); 461 xfs_failaddr_t xfs_btree_lblock_verify(struct xfs_buf *bp, 462 unsigned int max_recs); 463 464 uint xfs_btree_compute_maxlevels(uint *limits, unsigned long len); 465 unsigned long long xfs_btree_calc_size(uint *limits, unsigned long long len); 466 467 /* return codes */ 468 #define XFS_BTREE_QUERY_RANGE_CONTINUE (XFS_ITER_CONTINUE) /* keep iterating */ 469 #define XFS_BTREE_QUERY_RANGE_ABORT (XFS_ITER_ABORT) /* stop iterating */ 470 typedef int (*xfs_btree_query_range_fn)(struct xfs_btree_cur *cur, 471 union xfs_btree_rec *rec, void *priv); 472 473 int xfs_btree_query_range(struct xfs_btree_cur *cur, 474 union xfs_btree_irec *low_rec, union xfs_btree_irec *high_rec, 475 xfs_btree_query_range_fn fn, void *priv); 476 int xfs_btree_query_all(struct xfs_btree_cur *cur, xfs_btree_query_range_fn fn, 477 void *priv); 478 479 typedef int (*xfs_btree_visit_blocks_fn)(struct xfs_btree_cur *cur, int level, 480 void *data); 481 int xfs_btree_visit_blocks(struct xfs_btree_cur *cur, 482 xfs_btree_visit_blocks_fn fn, void *data); 483 484 int xfs_btree_count_blocks(struct xfs_btree_cur *cur, xfs_extlen_t *blocks); 485 486 union xfs_btree_rec *xfs_btree_rec_addr(struct xfs_btree_cur *cur, int n, 487 struct xfs_btree_block *block); 488 union xfs_btree_key *xfs_btree_key_addr(struct xfs_btree_cur *cur, int n, 489 struct xfs_btree_block *block); 490 union xfs_btree_key *xfs_btree_high_key_addr(struct xfs_btree_cur *cur, int n, 491 struct xfs_btree_block *block); 492 union xfs_btree_ptr *xfs_btree_ptr_addr(struct xfs_btree_cur *cur, int n, 493 struct xfs_btree_block *block); 494 int xfs_btree_lookup_get_block(struct xfs_btree_cur *cur, int level, 495 union xfs_btree_ptr *pp, struct xfs_btree_block **blkp); 496 struct xfs_btree_block *xfs_btree_get_block(struct xfs_btree_cur *cur, 497 int level, struct xfs_buf **bpp); 498 bool xfs_btree_ptr_is_null(struct xfs_btree_cur *cur, union xfs_btree_ptr *ptr); 499 int64_t xfs_btree_diff_two_ptrs(struct xfs_btree_cur *cur, 500 const union xfs_btree_ptr *a, 501 const union xfs_btree_ptr *b); 502 void xfs_btree_get_sibling(struct xfs_btree_cur *cur, 503 struct xfs_btree_block *block, 504 union xfs_btree_ptr *ptr, int lr); 505 void xfs_btree_get_keys(struct xfs_btree_cur *cur, 506 struct xfs_btree_block *block, union xfs_btree_key *key); 507 union xfs_btree_key *xfs_btree_high_key_from_key(struct xfs_btree_cur *cur, 508 union xfs_btree_key *key); 509 int xfs_btree_has_record(struct xfs_btree_cur *cur, union xfs_btree_irec *low, 510 union xfs_btree_irec *high, bool *exists); 511 bool xfs_btree_has_more_records(struct xfs_btree_cur *cur); 512 513 #endif /* __XFS_BTREE_H__ */ 514