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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 | /* * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc. * All Rights Reserved. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it would be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef __XFS_BTREE_H__ #define __XFS_BTREE_H__ struct xfs_buf; struct xfs_bmap_free; struct xfs_inode; struct xfs_mount; struct xfs_trans; extern kmem_zone_t *xfs_btree_cur_zone; /* * Generic key, ptr and record wrapper structures. * * These are disk format structures, and are converted where necessary * by the btree specific code that needs to interpret them. */ union xfs_btree_ptr { __be32 s; /* short form ptr */ __be64 l; /* long form ptr */ }; union xfs_btree_key { xfs_bmbt_key_t bmbt; xfs_bmdr_key_t bmbr; /* bmbt root block */ xfs_alloc_key_t alloc; xfs_inobt_key_t inobt; }; union xfs_btree_rec { xfs_bmbt_rec_t bmbt; xfs_bmdr_rec_t bmbr; /* bmbt root block */ xfs_alloc_rec_t alloc; xfs_inobt_rec_t inobt; }; /* * This nonsense is to make -wlint happy. */ #define XFS_LOOKUP_EQ ((xfs_lookup_t)XFS_LOOKUP_EQi) #define XFS_LOOKUP_LE ((xfs_lookup_t)XFS_LOOKUP_LEi) #define XFS_LOOKUP_GE ((xfs_lookup_t)XFS_LOOKUP_GEi) #define XFS_BTNUM_BNO ((xfs_btnum_t)XFS_BTNUM_BNOi) #define XFS_BTNUM_CNT ((xfs_btnum_t)XFS_BTNUM_CNTi) #define XFS_BTNUM_BMAP ((xfs_btnum_t)XFS_BTNUM_BMAPi) #define XFS_BTNUM_INO ((xfs_btnum_t)XFS_BTNUM_INOi) #define XFS_BTNUM_FINO ((xfs_btnum_t)XFS_BTNUM_FINOi) /* * For logging record fields. */ #define XFS_BB_MAGIC (1 << 0) #define XFS_BB_LEVEL (1 << 1) #define XFS_BB_NUMRECS (1 << 2) #define XFS_BB_LEFTSIB (1 << 3) #define XFS_BB_RIGHTSIB (1 << 4) #define XFS_BB_BLKNO (1 << 5) #define XFS_BB_LSN (1 << 6) #define XFS_BB_UUID (1 << 7) #define XFS_BB_OWNER (1 << 8) #define XFS_BB_NUM_BITS 5 #define XFS_BB_ALL_BITS ((1 << XFS_BB_NUM_BITS) - 1) #define XFS_BB_NUM_BITS_CRC 9 #define XFS_BB_ALL_BITS_CRC ((1 << XFS_BB_NUM_BITS_CRC) - 1) /* * Generic stats interface */ #define __XFS_BTREE_STATS_INC(mp, type, stat) \ XFS_STATS_INC(mp, xs_ ## type ## _2_ ## stat) #define XFS_BTREE_STATS_INC(cur, stat) \ do { \ struct xfs_mount *__mp = cur->bc_mp; \ switch (cur->bc_btnum) { \ case XFS_BTNUM_BNO: __XFS_BTREE_STATS_INC(__mp, abtb, stat); break; \ case XFS_BTNUM_CNT: __XFS_BTREE_STATS_INC(__mp, abtc, stat); break; \ case XFS_BTNUM_BMAP: __XFS_BTREE_STATS_INC(__mp, bmbt, stat); break; \ case XFS_BTNUM_INO: __XFS_BTREE_STATS_INC(__mp, ibt, stat); break; \ case XFS_BTNUM_FINO: __XFS_BTREE_STATS_INC(__mp, fibt, stat); break; \ case XFS_BTNUM_MAX: ASSERT(0); /* fucking gcc */ ; break; \ } \ } while (0) #define __XFS_BTREE_STATS_ADD(mp, type, stat, val) \ XFS_STATS_ADD(mp, xs_ ## type ## _2_ ## stat, val) #define XFS_BTREE_STATS_ADD(cur, stat, val) \ do { \ struct xfs_mount *__mp = cur->bc_mp; \ switch (cur->bc_btnum) { \ case XFS_BTNUM_BNO: \ __XFS_BTREE_STATS_ADD(__mp, abtb, stat, val); break; \ case XFS_BTNUM_CNT: \ __XFS_BTREE_STATS_ADD(__mp, abtc, stat, val); break; \ case XFS_BTNUM_BMAP: \ __XFS_BTREE_STATS_ADD(__mp, bmbt, stat, val); break; \ case XFS_BTNUM_INO: \ __XFS_BTREE_STATS_ADD(__mp, ibt, stat, val); break; \ case XFS_BTNUM_FINO: \ __XFS_BTREE_STATS_ADD(__mp, fibt, stat, val); break; \ case XFS_BTNUM_MAX: ASSERT(0); /* fucking gcc */ ; break; \ } \ } while (0) #define XFS_BTREE_MAXLEVELS 8 /* max of all btrees */ struct xfs_btree_ops { /* size of the key and record structures */ size_t key_len; size_t rec_len; /* cursor operations */ struct xfs_btree_cur *(*dup_cursor)(struct xfs_btree_cur *); void (*update_cursor)(struct xfs_btree_cur *src, struct xfs_btree_cur *dst); /* update btree root pointer */ void (*set_root)(struct xfs_btree_cur *cur, union xfs_btree_ptr *nptr, int level_change); /* block allocation / freeing */ int (*alloc_block)(struct xfs_btree_cur *cur, union xfs_btree_ptr *start_bno, union xfs_btree_ptr *new_bno, int *stat); int (*free_block)(struct xfs_btree_cur *cur, struct xfs_buf *bp); /* update last record information */ void (*update_lastrec)(struct xfs_btree_cur *cur, struct xfs_btree_block *block, union xfs_btree_rec *rec, int ptr, int reason); /* records in block/level */ int (*get_minrecs)(struct xfs_btree_cur *cur, int level); int (*get_maxrecs)(struct xfs_btree_cur *cur, int level); /* records on disk. Matter for the root in inode case. */ int (*get_dmaxrecs)(struct xfs_btree_cur *cur, int level); /* init values of btree structures */ void (*init_key_from_rec)(union xfs_btree_key *key, union xfs_btree_rec *rec); void (*init_rec_from_key)(union xfs_btree_key *key, union xfs_btree_rec *rec); void (*init_rec_from_cur)(struct xfs_btree_cur *cur, union xfs_btree_rec *rec); void (*init_ptr_from_cur)(struct xfs_btree_cur *cur, union xfs_btree_ptr *ptr); /* difference between key value and cursor value */ __int64_t (*key_diff)(struct xfs_btree_cur *cur, union xfs_btree_key *key); const struct xfs_buf_ops *buf_ops; #if defined(DEBUG) || defined(XFS_WARN) /* check that k1 is lower than k2 */ int (*keys_inorder)(struct xfs_btree_cur *cur, union xfs_btree_key *k1, union xfs_btree_key *k2); /* check that r1 is lower than r2 */ int (*recs_inorder)(struct xfs_btree_cur *cur, union xfs_btree_rec *r1, union xfs_btree_rec *r2); #endif }; /* * Reasons for the update_lastrec method to be called. */ #define LASTREC_UPDATE 0 #define LASTREC_INSREC 1 #define LASTREC_DELREC 2 /* * Btree cursor structure. * This collects all information needed by the btree code in one place. */ typedef struct xfs_btree_cur { struct xfs_trans *bc_tp; /* transaction we're in, if any */ struct xfs_mount *bc_mp; /* file system mount struct */ const struct xfs_btree_ops *bc_ops; uint bc_flags; /* btree features - below */ union { xfs_alloc_rec_incore_t a; xfs_bmbt_irec_t b; xfs_inobt_rec_incore_t i; } bc_rec; /* current insert/search record value */ struct xfs_buf *bc_bufs[XFS_BTREE_MAXLEVELS]; /* buf ptr per level */ int bc_ptrs[XFS_BTREE_MAXLEVELS]; /* key/record # */ __uint8_t bc_ra[XFS_BTREE_MAXLEVELS]; /* readahead bits */ #define XFS_BTCUR_LEFTRA 1 /* left sibling has been read-ahead */ #define XFS_BTCUR_RIGHTRA 2 /* right sibling has been read-ahead */ __uint8_t bc_nlevels; /* number of levels in the tree */ __uint8_t bc_blocklog; /* log2(blocksize) of btree blocks */ xfs_btnum_t bc_btnum; /* identifies which btree type */ union { struct { /* needed for BNO, CNT, INO */ struct xfs_buf *agbp; /* agf/agi buffer pointer */ xfs_agnumber_t agno; /* ag number */ } a; struct { /* needed for BMAP */ struct xfs_inode *ip; /* pointer to our inode */ struct xfs_bmap_free *flist; /* list to free after */ xfs_fsblock_t firstblock; /* 1st blk allocated */ int allocated; /* count of alloced */ short forksize; /* fork's inode space */ char whichfork; /* data or attr fork */ char flags; /* flags */ #define XFS_BTCUR_BPRV_WASDEL 1 /* was delayed */ } b; } bc_private; /* per-btree type data */ } xfs_btree_cur_t; /* cursor flags */ #define XFS_BTREE_LONG_PTRS (1<<0) /* pointers are 64bits long */ #define XFS_BTREE_ROOT_IN_INODE (1<<1) /* root may be variable size */ #define XFS_BTREE_LASTREC_UPDATE (1<<2) /* track last rec externally */ #define XFS_BTREE_CRC_BLOCKS (1<<3) /* uses extended btree blocks */ #define XFS_BTREE_NOERROR 0 #define XFS_BTREE_ERROR 1 /* * Convert from buffer to btree block header. */ #define XFS_BUF_TO_BLOCK(bp) ((struct xfs_btree_block *)((bp)->b_addr)) /* * Check that block header is ok. */ int xfs_btree_check_block( struct xfs_btree_cur *cur, /* btree cursor */ struct xfs_btree_block *block, /* generic btree block pointer */ int level, /* level of the btree block */ struct xfs_buf *bp); /* buffer containing block, if any */ /* * Check that (long) pointer is ok. */ int /* error (0 or EFSCORRUPTED) */ xfs_btree_check_lptr( struct xfs_btree_cur *cur, /* btree cursor */ xfs_fsblock_t ptr, /* btree block disk address */ int level); /* btree block level */ /* * Delete the btree cursor. */ void xfs_btree_del_cursor( xfs_btree_cur_t *cur, /* btree cursor */ int error); /* del because of error */ /* * Duplicate the btree cursor. * Allocate a new one, copy the record, re-get the buffers. */ int /* error */ xfs_btree_dup_cursor( xfs_btree_cur_t *cur, /* input cursor */ xfs_btree_cur_t **ncur);/* output cursor */ /* * Get a buffer for the block, return it with no data read. * Long-form addressing. */ struct xfs_buf * /* buffer for fsbno */ xfs_btree_get_bufl( struct xfs_mount *mp, /* file system mount point */ struct xfs_trans *tp, /* transaction pointer */ xfs_fsblock_t fsbno, /* file system block number */ uint lock); /* lock flags for get_buf */ /* * Get a buffer for the block, return it with no data read. * Short-form addressing. */ struct xfs_buf * /* buffer for agno/agbno */ xfs_btree_get_bufs( struct xfs_mount *mp, /* file system mount point */ struct xfs_trans *tp, /* transaction pointer */ xfs_agnumber_t agno, /* allocation group number */ xfs_agblock_t agbno, /* allocation group block number */ uint lock); /* lock flags for get_buf */ /* * Check for the cursor referring to the last block at the given level. */ int /* 1=is last block, 0=not last block */ xfs_btree_islastblock( xfs_btree_cur_t *cur, /* btree cursor */ int level); /* level to check */ /* * Compute first and last byte offsets for the fields given. * Interprets the offsets table, which contains struct field offsets. */ void xfs_btree_offsets( __int64_t fields, /* bitmask of fields */ const short *offsets,/* table of field offsets */ int nbits, /* number of bits to inspect */ int *first, /* output: first byte offset */ int *last); /* output: last byte offset */ /* * Get a buffer for the block, return it read in. * Long-form addressing. */ int /* error */ xfs_btree_read_bufl( struct xfs_mount *mp, /* file system mount point */ struct xfs_trans *tp, /* transaction pointer */ xfs_fsblock_t fsbno, /* file system block number */ uint lock, /* lock flags for read_buf */ struct xfs_buf **bpp, /* buffer for fsbno */ int refval, /* ref count value for buffer */ const struct xfs_buf_ops *ops); /* * Read-ahead the block, don't wait for it, don't return a buffer. * Long-form addressing. */ void /* error */ xfs_btree_reada_bufl( struct xfs_mount *mp, /* file system mount point */ xfs_fsblock_t fsbno, /* file system block number */ xfs_extlen_t count, /* count of filesystem blocks */ const struct xfs_buf_ops *ops); /* * Read-ahead the block, don't wait for it, don't return a buffer. * Short-form addressing. */ void /* error */ xfs_btree_reada_bufs( struct xfs_mount *mp, /* file system mount point */ xfs_agnumber_t agno, /* allocation group number */ xfs_agblock_t agbno, /* allocation group block number */ xfs_extlen_t count, /* count of filesystem blocks */ const struct xfs_buf_ops *ops); /* * Initialise a new btree block header */ void xfs_btree_init_block( struct xfs_mount *mp, struct xfs_buf *bp, __u32 magic, __u16 level, __u16 numrecs, __u64 owner, unsigned int flags); void xfs_btree_init_block_int( struct xfs_mount *mp, struct xfs_btree_block *buf, xfs_daddr_t blkno, __u32 magic, __u16 level, __u16 numrecs, __u64 owner, unsigned int flags); /* * Common btree core entry points. */ int xfs_btree_increment(struct xfs_btree_cur *, int, int *); int xfs_btree_decrement(struct xfs_btree_cur *, int, int *); int xfs_btree_lookup(struct xfs_btree_cur *, xfs_lookup_t, int *); int xfs_btree_update(struct xfs_btree_cur *, union xfs_btree_rec *); int xfs_btree_new_iroot(struct xfs_btree_cur *, int *, int *); int xfs_btree_insert(struct xfs_btree_cur *, int *); int xfs_btree_delete(struct xfs_btree_cur *, int *); int xfs_btree_get_rec(struct xfs_btree_cur *, union xfs_btree_rec **, int *); int xfs_btree_change_owner(struct xfs_btree_cur *cur, __uint64_t new_owner, struct list_head *buffer_list); /* * btree block CRC helpers */ void xfs_btree_lblock_calc_crc(struct xfs_buf *); bool xfs_btree_lblock_verify_crc(struct xfs_buf *); void xfs_btree_sblock_calc_crc(struct xfs_buf *); bool xfs_btree_sblock_verify_crc(struct xfs_buf *); /* * Internal btree helpers also used by xfs_bmap.c. */ void xfs_btree_log_block(struct xfs_btree_cur *, struct xfs_buf *, int); void xfs_btree_log_recs(struct xfs_btree_cur *, struct xfs_buf *, int, int); /* * Helpers. */ static inline int xfs_btree_get_numrecs(struct xfs_btree_block *block) { return be16_to_cpu(block->bb_numrecs); } static inline void xfs_btree_set_numrecs(struct xfs_btree_block *block, __uint16_t numrecs) { block->bb_numrecs = cpu_to_be16(numrecs); } static inline int xfs_btree_get_level(struct xfs_btree_block *block) { return be16_to_cpu(block->bb_level); } /* * Min and max functions for extlen, agblock, fileoff, and filblks types. */ #define XFS_EXTLEN_MIN(a,b) min_t(xfs_extlen_t, (a), (b)) #define XFS_EXTLEN_MAX(a,b) max_t(xfs_extlen_t, (a), (b)) #define XFS_AGBLOCK_MIN(a,b) min_t(xfs_agblock_t, (a), (b)) #define XFS_AGBLOCK_MAX(a,b) max_t(xfs_agblock_t, (a), (b)) #define XFS_FILEOFF_MIN(a,b) min_t(xfs_fileoff_t, (a), (b)) #define XFS_FILEOFF_MAX(a,b) max_t(xfs_fileoff_t, (a), (b)) #define XFS_FILBLKS_MIN(a,b) min_t(xfs_filblks_t, (a), (b)) #define XFS_FILBLKS_MAX(a,b) max_t(xfs_filblks_t, (a), (b)) #define XFS_FSB_SANITY_CHECK(mp,fsb) \ (XFS_FSB_TO_AGNO(mp, fsb) < mp->m_sb.sb_agcount && \ XFS_FSB_TO_AGBNO(mp, fsb) < mp->m_sb.sb_agblocks) /* * Trace hooks. Currently not implemented as they need to be ported * over to the generic tracing functionality, which is some effort. * * i,j = integer (32 bit) * b = btree block buffer (xfs_buf_t) * p = btree ptr * r = btree record * k = btree key */ #define XFS_BTREE_TRACE_ARGBI(c, b, i) #define XFS_BTREE_TRACE_ARGBII(c, b, i, j) #define XFS_BTREE_TRACE_ARGI(c, i) #define XFS_BTREE_TRACE_ARGIPK(c, i, p, s) #define XFS_BTREE_TRACE_ARGIPR(c, i, p, r) #define XFS_BTREE_TRACE_ARGIK(c, i, k) #define XFS_BTREE_TRACE_ARGR(c, r) #define XFS_BTREE_TRACE_CURSOR(c, t) #endif /* __XFS_BTREE_H__ */ |