1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc. 4 * All Rights Reserved. 5 */ 6 #include "xfs.h" 7 #include "xfs_fs.h" 8 #include "xfs_shared.h" 9 #include "xfs_format.h" 10 #include "xfs_log_format.h" 11 #include "xfs_trans_resv.h" 12 #include "xfs_mount.h" 13 #include "xfs_btree.h" 14 #include "xfs_btree_staging.h" 15 #include "xfs_alloc_btree.h" 16 #include "xfs_alloc.h" 17 #include "xfs_extent_busy.h" 18 #include "xfs_error.h" 19 #include "xfs_health.h" 20 #include "xfs_trace.h" 21 #include "xfs_trans.h" 22 #include "xfs_ag.h" 23 24 static struct kmem_cache *xfs_allocbt_cur_cache; 25 26 STATIC struct xfs_btree_cur * 27 xfs_bnobt_dup_cursor( 28 struct xfs_btree_cur *cur) 29 { 30 return xfs_bnobt_init_cursor(cur->bc_mp, cur->bc_tp, cur->bc_ag.agbp, 31 cur->bc_ag.pag); 32 } 33 34 STATIC struct xfs_btree_cur * 35 xfs_cntbt_dup_cursor( 36 struct xfs_btree_cur *cur) 37 { 38 return xfs_cntbt_init_cursor(cur->bc_mp, cur->bc_tp, cur->bc_ag.agbp, 39 cur->bc_ag.pag); 40 } 41 42 43 STATIC void 44 xfs_allocbt_set_root( 45 struct xfs_btree_cur *cur, 46 const union xfs_btree_ptr *ptr, 47 int inc) 48 { 49 struct xfs_buf *agbp = cur->bc_ag.agbp; 50 struct xfs_agf *agf = agbp->b_addr; 51 52 ASSERT(ptr->s != 0); 53 54 if (xfs_btree_is_bno(cur->bc_ops)) { 55 agf->agf_bno_root = ptr->s; 56 be32_add_cpu(&agf->agf_bno_level, inc); 57 cur->bc_ag.pag->pagf_bno_level += inc; 58 } else { 59 agf->agf_cnt_root = ptr->s; 60 be32_add_cpu(&agf->agf_cnt_level, inc); 61 cur->bc_ag.pag->pagf_cnt_level += inc; 62 } 63 64 xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_ROOTS | XFS_AGF_LEVELS); 65 } 66 67 STATIC int 68 xfs_allocbt_alloc_block( 69 struct xfs_btree_cur *cur, 70 const union xfs_btree_ptr *start, 71 union xfs_btree_ptr *new, 72 int *stat) 73 { 74 int error; 75 xfs_agblock_t bno; 76 77 /* Allocate the new block from the freelist. If we can't, give up. */ 78 error = xfs_alloc_get_freelist(cur->bc_ag.pag, cur->bc_tp, 79 cur->bc_ag.agbp, &bno, 1); 80 if (error) 81 return error; 82 83 if (bno == NULLAGBLOCK) { 84 *stat = 0; 85 return 0; 86 } 87 88 atomic64_inc(&cur->bc_mp->m_allocbt_blks); 89 xfs_extent_busy_reuse(cur->bc_mp, cur->bc_ag.pag, bno, 1, false); 90 91 new->s = cpu_to_be32(bno); 92 93 *stat = 1; 94 return 0; 95 } 96 97 STATIC int 98 xfs_allocbt_free_block( 99 struct xfs_btree_cur *cur, 100 struct xfs_buf *bp) 101 { 102 struct xfs_buf *agbp = cur->bc_ag.agbp; 103 xfs_agblock_t bno; 104 int error; 105 106 bno = xfs_daddr_to_agbno(cur->bc_mp, xfs_buf_daddr(bp)); 107 error = xfs_alloc_put_freelist(cur->bc_ag.pag, cur->bc_tp, agbp, NULL, 108 bno, 1); 109 if (error) 110 return error; 111 112 atomic64_dec(&cur->bc_mp->m_allocbt_blks); 113 xfs_extent_busy_insert(cur->bc_tp, agbp->b_pag, bno, 1, 114 XFS_EXTENT_BUSY_SKIP_DISCARD); 115 return 0; 116 } 117 118 /* 119 * Update the longest extent in the AGF 120 */ 121 STATIC void 122 xfs_allocbt_update_lastrec( 123 struct xfs_btree_cur *cur, 124 const struct xfs_btree_block *block, 125 const union xfs_btree_rec *rec, 126 int ptr, 127 int reason) 128 { 129 struct xfs_agf *agf = cur->bc_ag.agbp->b_addr; 130 struct xfs_perag *pag; 131 __be32 len; 132 int numrecs; 133 134 ASSERT(!xfs_btree_is_bno(cur->bc_ops)); 135 136 switch (reason) { 137 case LASTREC_UPDATE: 138 /* 139 * If this is the last leaf block and it's the last record, 140 * then update the size of the longest extent in the AG. 141 */ 142 if (ptr != xfs_btree_get_numrecs(block)) 143 return; 144 len = rec->alloc.ar_blockcount; 145 break; 146 case LASTREC_INSREC: 147 if (be32_to_cpu(rec->alloc.ar_blockcount) <= 148 be32_to_cpu(agf->agf_longest)) 149 return; 150 len = rec->alloc.ar_blockcount; 151 break; 152 case LASTREC_DELREC: 153 numrecs = xfs_btree_get_numrecs(block); 154 if (ptr <= numrecs) 155 return; 156 ASSERT(ptr == numrecs + 1); 157 158 if (numrecs) { 159 xfs_alloc_rec_t *rrp; 160 161 rrp = XFS_ALLOC_REC_ADDR(cur->bc_mp, block, numrecs); 162 len = rrp->ar_blockcount; 163 } else { 164 len = 0; 165 } 166 167 break; 168 default: 169 ASSERT(0); 170 return; 171 } 172 173 agf->agf_longest = len; 174 pag = cur->bc_ag.agbp->b_pag; 175 pag->pagf_longest = be32_to_cpu(len); 176 xfs_alloc_log_agf(cur->bc_tp, cur->bc_ag.agbp, XFS_AGF_LONGEST); 177 } 178 179 STATIC int 180 xfs_allocbt_get_minrecs( 181 struct xfs_btree_cur *cur, 182 int level) 183 { 184 return cur->bc_mp->m_alloc_mnr[level != 0]; 185 } 186 187 STATIC int 188 xfs_allocbt_get_maxrecs( 189 struct xfs_btree_cur *cur, 190 int level) 191 { 192 return cur->bc_mp->m_alloc_mxr[level != 0]; 193 } 194 195 STATIC void 196 xfs_allocbt_init_key_from_rec( 197 union xfs_btree_key *key, 198 const union xfs_btree_rec *rec) 199 { 200 key->alloc.ar_startblock = rec->alloc.ar_startblock; 201 key->alloc.ar_blockcount = rec->alloc.ar_blockcount; 202 } 203 204 STATIC void 205 xfs_bnobt_init_high_key_from_rec( 206 union xfs_btree_key *key, 207 const union xfs_btree_rec *rec) 208 { 209 __u32 x; 210 211 x = be32_to_cpu(rec->alloc.ar_startblock); 212 x += be32_to_cpu(rec->alloc.ar_blockcount) - 1; 213 key->alloc.ar_startblock = cpu_to_be32(x); 214 key->alloc.ar_blockcount = 0; 215 } 216 217 STATIC void 218 xfs_cntbt_init_high_key_from_rec( 219 union xfs_btree_key *key, 220 const union xfs_btree_rec *rec) 221 { 222 key->alloc.ar_blockcount = rec->alloc.ar_blockcount; 223 key->alloc.ar_startblock = 0; 224 } 225 226 STATIC void 227 xfs_allocbt_init_rec_from_cur( 228 struct xfs_btree_cur *cur, 229 union xfs_btree_rec *rec) 230 { 231 rec->alloc.ar_startblock = cpu_to_be32(cur->bc_rec.a.ar_startblock); 232 rec->alloc.ar_blockcount = cpu_to_be32(cur->bc_rec.a.ar_blockcount); 233 } 234 235 STATIC void 236 xfs_allocbt_init_ptr_from_cur( 237 struct xfs_btree_cur *cur, 238 union xfs_btree_ptr *ptr) 239 { 240 struct xfs_agf *agf = cur->bc_ag.agbp->b_addr; 241 242 ASSERT(cur->bc_ag.pag->pag_agno == be32_to_cpu(agf->agf_seqno)); 243 244 if (xfs_btree_is_bno(cur->bc_ops)) 245 ptr->s = agf->agf_bno_root; 246 else 247 ptr->s = agf->agf_cnt_root; 248 } 249 250 STATIC int64_t 251 xfs_bnobt_key_diff( 252 struct xfs_btree_cur *cur, 253 const union xfs_btree_key *key) 254 { 255 struct xfs_alloc_rec_incore *rec = &cur->bc_rec.a; 256 const struct xfs_alloc_rec *kp = &key->alloc; 257 258 return (int64_t)be32_to_cpu(kp->ar_startblock) - rec->ar_startblock; 259 } 260 261 STATIC int64_t 262 xfs_cntbt_key_diff( 263 struct xfs_btree_cur *cur, 264 const union xfs_btree_key *key) 265 { 266 struct xfs_alloc_rec_incore *rec = &cur->bc_rec.a; 267 const struct xfs_alloc_rec *kp = &key->alloc; 268 int64_t diff; 269 270 diff = (int64_t)be32_to_cpu(kp->ar_blockcount) - rec->ar_blockcount; 271 if (diff) 272 return diff; 273 274 return (int64_t)be32_to_cpu(kp->ar_startblock) - rec->ar_startblock; 275 } 276 277 STATIC int64_t 278 xfs_bnobt_diff_two_keys( 279 struct xfs_btree_cur *cur, 280 const union xfs_btree_key *k1, 281 const union xfs_btree_key *k2, 282 const union xfs_btree_key *mask) 283 { 284 ASSERT(!mask || mask->alloc.ar_startblock); 285 286 return (int64_t)be32_to_cpu(k1->alloc.ar_startblock) - 287 be32_to_cpu(k2->alloc.ar_startblock); 288 } 289 290 STATIC int64_t 291 xfs_cntbt_diff_two_keys( 292 struct xfs_btree_cur *cur, 293 const union xfs_btree_key *k1, 294 const union xfs_btree_key *k2, 295 const union xfs_btree_key *mask) 296 { 297 int64_t diff; 298 299 ASSERT(!mask || (mask->alloc.ar_blockcount && 300 mask->alloc.ar_startblock)); 301 302 diff = be32_to_cpu(k1->alloc.ar_blockcount) - 303 be32_to_cpu(k2->alloc.ar_blockcount); 304 if (diff) 305 return diff; 306 307 return be32_to_cpu(k1->alloc.ar_startblock) - 308 be32_to_cpu(k2->alloc.ar_startblock); 309 } 310 311 static xfs_failaddr_t 312 xfs_allocbt_verify( 313 struct xfs_buf *bp) 314 { 315 struct xfs_mount *mp = bp->b_mount; 316 struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp); 317 struct xfs_perag *pag = bp->b_pag; 318 xfs_failaddr_t fa; 319 unsigned int level; 320 321 if (!xfs_verify_magic(bp, block->bb_magic)) 322 return __this_address; 323 324 if (xfs_has_crc(mp)) { 325 fa = xfs_btree_agblock_v5hdr_verify(bp); 326 if (fa) 327 return fa; 328 } 329 330 /* 331 * The perag may not be attached during grow operations or fully 332 * initialized from the AGF during log recovery. Therefore we can only 333 * check against maximum tree depth from those contexts. 334 * 335 * Otherwise check against the per-tree limit. Peek at one of the 336 * verifier magic values to determine the type of tree we're verifying 337 * against. 338 */ 339 level = be16_to_cpu(block->bb_level); 340 if (pag && xfs_perag_initialised_agf(pag)) { 341 unsigned int maxlevel, repair_maxlevel = 0; 342 343 /* 344 * Online repair could be rewriting the free space btrees, so 345 * we'll validate against the larger of either tree while this 346 * is going on. 347 */ 348 if (bp->b_ops->magic[0] == cpu_to_be32(XFS_ABTC_MAGIC)) { 349 maxlevel = pag->pagf_cnt_level; 350 #ifdef CONFIG_XFS_ONLINE_REPAIR 351 repair_maxlevel = pag->pagf_repair_cnt_level; 352 #endif 353 } else { 354 maxlevel = pag->pagf_bno_level; 355 #ifdef CONFIG_XFS_ONLINE_REPAIR 356 repair_maxlevel = pag->pagf_repair_bno_level; 357 #endif 358 } 359 360 if (level >= max(maxlevel, repair_maxlevel)) 361 return __this_address; 362 } else if (level >= mp->m_alloc_maxlevels) 363 return __this_address; 364 365 return xfs_btree_agblock_verify(bp, mp->m_alloc_mxr[level != 0]); 366 } 367 368 static void 369 xfs_allocbt_read_verify( 370 struct xfs_buf *bp) 371 { 372 xfs_failaddr_t fa; 373 374 if (!xfs_btree_agblock_verify_crc(bp)) 375 xfs_verifier_error(bp, -EFSBADCRC, __this_address); 376 else { 377 fa = xfs_allocbt_verify(bp); 378 if (fa) 379 xfs_verifier_error(bp, -EFSCORRUPTED, fa); 380 } 381 382 if (bp->b_error) 383 trace_xfs_btree_corrupt(bp, _RET_IP_); 384 } 385 386 static void 387 xfs_allocbt_write_verify( 388 struct xfs_buf *bp) 389 { 390 xfs_failaddr_t fa; 391 392 fa = xfs_allocbt_verify(bp); 393 if (fa) { 394 trace_xfs_btree_corrupt(bp, _RET_IP_); 395 xfs_verifier_error(bp, -EFSCORRUPTED, fa); 396 return; 397 } 398 xfs_btree_agblock_calc_crc(bp); 399 400 } 401 402 const struct xfs_buf_ops xfs_bnobt_buf_ops = { 403 .name = "xfs_bnobt", 404 .magic = { cpu_to_be32(XFS_ABTB_MAGIC), 405 cpu_to_be32(XFS_ABTB_CRC_MAGIC) }, 406 .verify_read = xfs_allocbt_read_verify, 407 .verify_write = xfs_allocbt_write_verify, 408 .verify_struct = xfs_allocbt_verify, 409 }; 410 411 const struct xfs_buf_ops xfs_cntbt_buf_ops = { 412 .name = "xfs_cntbt", 413 .magic = { cpu_to_be32(XFS_ABTC_MAGIC), 414 cpu_to_be32(XFS_ABTC_CRC_MAGIC) }, 415 .verify_read = xfs_allocbt_read_verify, 416 .verify_write = xfs_allocbt_write_verify, 417 .verify_struct = xfs_allocbt_verify, 418 }; 419 420 STATIC int 421 xfs_bnobt_keys_inorder( 422 struct xfs_btree_cur *cur, 423 const union xfs_btree_key *k1, 424 const union xfs_btree_key *k2) 425 { 426 return be32_to_cpu(k1->alloc.ar_startblock) < 427 be32_to_cpu(k2->alloc.ar_startblock); 428 } 429 430 STATIC int 431 xfs_bnobt_recs_inorder( 432 struct xfs_btree_cur *cur, 433 const union xfs_btree_rec *r1, 434 const union xfs_btree_rec *r2) 435 { 436 return be32_to_cpu(r1->alloc.ar_startblock) + 437 be32_to_cpu(r1->alloc.ar_blockcount) <= 438 be32_to_cpu(r2->alloc.ar_startblock); 439 } 440 441 STATIC int 442 xfs_cntbt_keys_inorder( 443 struct xfs_btree_cur *cur, 444 const union xfs_btree_key *k1, 445 const union xfs_btree_key *k2) 446 { 447 return be32_to_cpu(k1->alloc.ar_blockcount) < 448 be32_to_cpu(k2->alloc.ar_blockcount) || 449 (k1->alloc.ar_blockcount == k2->alloc.ar_blockcount && 450 be32_to_cpu(k1->alloc.ar_startblock) < 451 be32_to_cpu(k2->alloc.ar_startblock)); 452 } 453 454 STATIC int 455 xfs_cntbt_recs_inorder( 456 struct xfs_btree_cur *cur, 457 const union xfs_btree_rec *r1, 458 const union xfs_btree_rec *r2) 459 { 460 return be32_to_cpu(r1->alloc.ar_blockcount) < 461 be32_to_cpu(r2->alloc.ar_blockcount) || 462 (r1->alloc.ar_blockcount == r2->alloc.ar_blockcount && 463 be32_to_cpu(r1->alloc.ar_startblock) < 464 be32_to_cpu(r2->alloc.ar_startblock)); 465 } 466 467 STATIC enum xbtree_key_contig 468 xfs_allocbt_keys_contiguous( 469 struct xfs_btree_cur *cur, 470 const union xfs_btree_key *key1, 471 const union xfs_btree_key *key2, 472 const union xfs_btree_key *mask) 473 { 474 ASSERT(!mask || mask->alloc.ar_startblock); 475 476 return xbtree_key_contig(be32_to_cpu(key1->alloc.ar_startblock), 477 be32_to_cpu(key2->alloc.ar_startblock)); 478 } 479 480 const struct xfs_btree_ops xfs_bnobt_ops = { 481 .name = "bno", 482 .type = XFS_BTREE_TYPE_AG, 483 484 .rec_len = sizeof(xfs_alloc_rec_t), 485 .key_len = sizeof(xfs_alloc_key_t), 486 .ptr_len = XFS_BTREE_SHORT_PTR_LEN, 487 488 .lru_refs = XFS_ALLOC_BTREE_REF, 489 .statoff = XFS_STATS_CALC_INDEX(xs_abtb_2), 490 .sick_mask = XFS_SICK_AG_BNOBT, 491 492 .dup_cursor = xfs_bnobt_dup_cursor, 493 .set_root = xfs_allocbt_set_root, 494 .alloc_block = xfs_allocbt_alloc_block, 495 .free_block = xfs_allocbt_free_block, 496 .update_lastrec = xfs_allocbt_update_lastrec, 497 .get_minrecs = xfs_allocbt_get_minrecs, 498 .get_maxrecs = xfs_allocbt_get_maxrecs, 499 .init_key_from_rec = xfs_allocbt_init_key_from_rec, 500 .init_high_key_from_rec = xfs_bnobt_init_high_key_from_rec, 501 .init_rec_from_cur = xfs_allocbt_init_rec_from_cur, 502 .init_ptr_from_cur = xfs_allocbt_init_ptr_from_cur, 503 .key_diff = xfs_bnobt_key_diff, 504 .buf_ops = &xfs_bnobt_buf_ops, 505 .diff_two_keys = xfs_bnobt_diff_two_keys, 506 .keys_inorder = xfs_bnobt_keys_inorder, 507 .recs_inorder = xfs_bnobt_recs_inorder, 508 .keys_contiguous = xfs_allocbt_keys_contiguous, 509 }; 510 511 const struct xfs_btree_ops xfs_cntbt_ops = { 512 .name = "cnt", 513 .type = XFS_BTREE_TYPE_AG, 514 .geom_flags = XFS_BTGEO_LASTREC_UPDATE, 515 516 .rec_len = sizeof(xfs_alloc_rec_t), 517 .key_len = sizeof(xfs_alloc_key_t), 518 .ptr_len = XFS_BTREE_SHORT_PTR_LEN, 519 520 .lru_refs = XFS_ALLOC_BTREE_REF, 521 .statoff = XFS_STATS_CALC_INDEX(xs_abtc_2), 522 .sick_mask = XFS_SICK_AG_CNTBT, 523 524 .dup_cursor = xfs_cntbt_dup_cursor, 525 .set_root = xfs_allocbt_set_root, 526 .alloc_block = xfs_allocbt_alloc_block, 527 .free_block = xfs_allocbt_free_block, 528 .update_lastrec = xfs_allocbt_update_lastrec, 529 .get_minrecs = xfs_allocbt_get_minrecs, 530 .get_maxrecs = xfs_allocbt_get_maxrecs, 531 .init_key_from_rec = xfs_allocbt_init_key_from_rec, 532 .init_high_key_from_rec = xfs_cntbt_init_high_key_from_rec, 533 .init_rec_from_cur = xfs_allocbt_init_rec_from_cur, 534 .init_ptr_from_cur = xfs_allocbt_init_ptr_from_cur, 535 .key_diff = xfs_cntbt_key_diff, 536 .buf_ops = &xfs_cntbt_buf_ops, 537 .diff_two_keys = xfs_cntbt_diff_two_keys, 538 .keys_inorder = xfs_cntbt_keys_inorder, 539 .recs_inorder = xfs_cntbt_recs_inorder, 540 .keys_contiguous = NULL, /* not needed right now */ 541 }; 542 543 /* 544 * Allocate a new bnobt cursor. 545 * 546 * For staging cursors tp and agbp are NULL. 547 */ 548 struct xfs_btree_cur * 549 xfs_bnobt_init_cursor( 550 struct xfs_mount *mp, 551 struct xfs_trans *tp, 552 struct xfs_buf *agbp, 553 struct xfs_perag *pag) 554 { 555 struct xfs_btree_cur *cur; 556 557 cur = xfs_btree_alloc_cursor(mp, tp, &xfs_bnobt_ops, 558 mp->m_alloc_maxlevels, xfs_allocbt_cur_cache); 559 cur->bc_ag.pag = xfs_perag_hold(pag); 560 cur->bc_ag.agbp = agbp; 561 if (agbp) { 562 struct xfs_agf *agf = agbp->b_addr; 563 564 cur->bc_nlevels = be32_to_cpu(agf->agf_bno_level); 565 } 566 return cur; 567 } 568 569 /* 570 * Allocate a new cntbt cursor. 571 * 572 * For staging cursors tp and agbp are NULL. 573 */ 574 struct xfs_btree_cur * 575 xfs_cntbt_init_cursor( 576 struct xfs_mount *mp, 577 struct xfs_trans *tp, 578 struct xfs_buf *agbp, 579 struct xfs_perag *pag) 580 { 581 struct xfs_btree_cur *cur; 582 583 cur = xfs_btree_alloc_cursor(mp, tp, &xfs_cntbt_ops, 584 mp->m_alloc_maxlevels, xfs_allocbt_cur_cache); 585 cur->bc_ag.pag = xfs_perag_hold(pag); 586 cur->bc_ag.agbp = agbp; 587 if (agbp) { 588 struct xfs_agf *agf = agbp->b_addr; 589 590 cur->bc_nlevels = be32_to_cpu(agf->agf_cnt_level); 591 } 592 return cur; 593 } 594 595 /* 596 * Install a new free space btree root. Caller is responsible for invalidating 597 * and freeing the old btree blocks. 598 */ 599 void 600 xfs_allocbt_commit_staged_btree( 601 struct xfs_btree_cur *cur, 602 struct xfs_trans *tp, 603 struct xfs_buf *agbp) 604 { 605 struct xfs_agf *agf = agbp->b_addr; 606 struct xbtree_afakeroot *afake = cur->bc_ag.afake; 607 608 ASSERT(cur->bc_flags & XFS_BTREE_STAGING); 609 610 if (xfs_btree_is_bno(cur->bc_ops)) { 611 agf->agf_bno_root = cpu_to_be32(afake->af_root); 612 agf->agf_bno_level = cpu_to_be32(afake->af_levels); 613 } else { 614 agf->agf_cnt_root = cpu_to_be32(afake->af_root); 615 agf->agf_cnt_level = cpu_to_be32(afake->af_levels); 616 } 617 xfs_alloc_log_agf(tp, agbp, XFS_AGF_ROOTS | XFS_AGF_LEVELS); 618 619 xfs_btree_commit_afakeroot(cur, tp, agbp); 620 } 621 622 /* Calculate number of records in an alloc btree block. */ 623 static inline unsigned int 624 xfs_allocbt_block_maxrecs( 625 unsigned int blocklen, 626 bool leaf) 627 { 628 if (leaf) 629 return blocklen / sizeof(xfs_alloc_rec_t); 630 return blocklen / (sizeof(xfs_alloc_key_t) + sizeof(xfs_alloc_ptr_t)); 631 } 632 633 /* 634 * Calculate number of records in an alloc btree block. 635 */ 636 int 637 xfs_allocbt_maxrecs( 638 struct xfs_mount *mp, 639 int blocklen, 640 int leaf) 641 { 642 blocklen -= XFS_ALLOC_BLOCK_LEN(mp); 643 return xfs_allocbt_block_maxrecs(blocklen, leaf); 644 } 645 646 /* Free space btrees are at their largest when every other block is free. */ 647 #define XFS_MAX_FREESP_RECORDS ((XFS_MAX_AG_BLOCKS + 1) / 2) 648 649 /* Compute the max possible height for free space btrees. */ 650 unsigned int 651 xfs_allocbt_maxlevels_ondisk(void) 652 { 653 unsigned int minrecs[2]; 654 unsigned int blocklen; 655 656 blocklen = min(XFS_MIN_BLOCKSIZE - XFS_BTREE_SBLOCK_LEN, 657 XFS_MIN_CRC_BLOCKSIZE - XFS_BTREE_SBLOCK_CRC_LEN); 658 659 minrecs[0] = xfs_allocbt_block_maxrecs(blocklen, true) / 2; 660 minrecs[1] = xfs_allocbt_block_maxrecs(blocklen, false) / 2; 661 662 return xfs_btree_compute_maxlevels(minrecs, XFS_MAX_FREESP_RECORDS); 663 } 664 665 /* Calculate the freespace btree size for some records. */ 666 xfs_extlen_t 667 xfs_allocbt_calc_size( 668 struct xfs_mount *mp, 669 unsigned long long len) 670 { 671 return xfs_btree_calc_size(mp->m_alloc_mnr, len); 672 } 673 674 int __init 675 xfs_allocbt_init_cur_cache(void) 676 { 677 xfs_allocbt_cur_cache = kmem_cache_create("xfs_bnobt_cur", 678 xfs_btree_cur_sizeof(xfs_allocbt_maxlevels_ondisk()), 679 0, 0, NULL); 680 681 if (!xfs_allocbt_cur_cache) 682 return -ENOMEM; 683 return 0; 684 } 685 686 void 687 xfs_allocbt_destroy_cur_cache(void) 688 { 689 kmem_cache_destroy(xfs_allocbt_cur_cache); 690 xfs_allocbt_cur_cache = NULL; 691 } 692