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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_trace.h"
20#include "xfs_trans.h"
21#include "xfs_ag.h"
22
23static struct kmem_cache *xfs_allocbt_cur_cache;
24
25STATIC struct xfs_btree_cur *
26xfs_allocbt_dup_cursor(
27 struct xfs_btree_cur *cur)
28{
29 return xfs_allocbt_init_cursor(cur->bc_mp, cur->bc_tp,
30 cur->bc_ag.agbp, cur->bc_ag.pag, cur->bc_btnum);
31}
32
33STATIC void
34xfs_allocbt_set_root(
35 struct xfs_btree_cur *cur,
36 const union xfs_btree_ptr *ptr,
37 int inc)
38{
39 struct xfs_buf *agbp = cur->bc_ag.agbp;
40 struct xfs_agf *agf = agbp->b_addr;
41 int btnum = cur->bc_btnum;
42
43 ASSERT(ptr->s != 0);
44
45 agf->agf_roots[btnum] = ptr->s;
46 be32_add_cpu(&agf->agf_levels[btnum], inc);
47 cur->bc_ag.pag->pagf_levels[btnum] += inc;
48
49 xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_ROOTS | XFS_AGF_LEVELS);
50}
51
52STATIC int
53xfs_allocbt_alloc_block(
54 struct xfs_btree_cur *cur,
55 const union xfs_btree_ptr *start,
56 union xfs_btree_ptr *new,
57 int *stat)
58{
59 int error;
60 xfs_agblock_t bno;
61
62 /* Allocate the new block from the freelist. If we can't, give up. */
63 error = xfs_alloc_get_freelist(cur->bc_ag.pag, cur->bc_tp,
64 cur->bc_ag.agbp, &bno, 1);
65 if (error)
66 return error;
67
68 if (bno == NULLAGBLOCK) {
69 *stat = 0;
70 return 0;
71 }
72
73 atomic64_inc(&cur->bc_mp->m_allocbt_blks);
74 xfs_extent_busy_reuse(cur->bc_mp, cur->bc_ag.pag, bno, 1, false);
75
76 new->s = cpu_to_be32(bno);
77
78 *stat = 1;
79 return 0;
80}
81
82STATIC int
83xfs_allocbt_free_block(
84 struct xfs_btree_cur *cur,
85 struct xfs_buf *bp)
86{
87 struct xfs_buf *agbp = cur->bc_ag.agbp;
88 xfs_agblock_t bno;
89 int error;
90
91 bno = xfs_daddr_to_agbno(cur->bc_mp, xfs_buf_daddr(bp));
92 error = xfs_alloc_put_freelist(cur->bc_ag.pag, cur->bc_tp, agbp, NULL,
93 bno, 1);
94 if (error)
95 return error;
96
97 atomic64_dec(&cur->bc_mp->m_allocbt_blks);
98 xfs_extent_busy_insert(cur->bc_tp, agbp->b_pag, bno, 1,
99 XFS_EXTENT_BUSY_SKIP_DISCARD);
100 return 0;
101}
102
103/*
104 * Update the longest extent in the AGF
105 */
106STATIC void
107xfs_allocbt_update_lastrec(
108 struct xfs_btree_cur *cur,
109 const struct xfs_btree_block *block,
110 const union xfs_btree_rec *rec,
111 int ptr,
112 int reason)
113{
114 struct xfs_agf *agf = cur->bc_ag.agbp->b_addr;
115 struct xfs_perag *pag;
116 __be32 len;
117 int numrecs;
118
119 ASSERT(cur->bc_btnum == XFS_BTNUM_CNT);
120
121 switch (reason) {
122 case LASTREC_UPDATE:
123 /*
124 * If this is the last leaf block and it's the last record,
125 * then update the size of the longest extent in the AG.
126 */
127 if (ptr != xfs_btree_get_numrecs(block))
128 return;
129 len = rec->alloc.ar_blockcount;
130 break;
131 case LASTREC_INSREC:
132 if (be32_to_cpu(rec->alloc.ar_blockcount) <=
133 be32_to_cpu(agf->agf_longest))
134 return;
135 len = rec->alloc.ar_blockcount;
136 break;
137 case LASTREC_DELREC:
138 numrecs = xfs_btree_get_numrecs(block);
139 if (ptr <= numrecs)
140 return;
141 ASSERT(ptr == numrecs + 1);
142
143 if (numrecs) {
144 xfs_alloc_rec_t *rrp;
145
146 rrp = XFS_ALLOC_REC_ADDR(cur->bc_mp, block, numrecs);
147 len = rrp->ar_blockcount;
148 } else {
149 len = 0;
150 }
151
152 break;
153 default:
154 ASSERT(0);
155 return;
156 }
157
158 agf->agf_longest = len;
159 pag = cur->bc_ag.agbp->b_pag;
160 pag->pagf_longest = be32_to_cpu(len);
161 xfs_alloc_log_agf(cur->bc_tp, cur->bc_ag.agbp, XFS_AGF_LONGEST);
162}
163
164STATIC int
165xfs_allocbt_get_minrecs(
166 struct xfs_btree_cur *cur,
167 int level)
168{
169 return cur->bc_mp->m_alloc_mnr[level != 0];
170}
171
172STATIC int
173xfs_allocbt_get_maxrecs(
174 struct xfs_btree_cur *cur,
175 int level)
176{
177 return cur->bc_mp->m_alloc_mxr[level != 0];
178}
179
180STATIC void
181xfs_allocbt_init_key_from_rec(
182 union xfs_btree_key *key,
183 const union xfs_btree_rec *rec)
184{
185 key->alloc.ar_startblock = rec->alloc.ar_startblock;
186 key->alloc.ar_blockcount = rec->alloc.ar_blockcount;
187}
188
189STATIC void
190xfs_bnobt_init_high_key_from_rec(
191 union xfs_btree_key *key,
192 const union xfs_btree_rec *rec)
193{
194 __u32 x;
195
196 x = be32_to_cpu(rec->alloc.ar_startblock);
197 x += be32_to_cpu(rec->alloc.ar_blockcount) - 1;
198 key->alloc.ar_startblock = cpu_to_be32(x);
199 key->alloc.ar_blockcount = 0;
200}
201
202STATIC void
203xfs_cntbt_init_high_key_from_rec(
204 union xfs_btree_key *key,
205 const union xfs_btree_rec *rec)
206{
207 key->alloc.ar_blockcount = rec->alloc.ar_blockcount;
208 key->alloc.ar_startblock = 0;
209}
210
211STATIC void
212xfs_allocbt_init_rec_from_cur(
213 struct xfs_btree_cur *cur,
214 union xfs_btree_rec *rec)
215{
216 rec->alloc.ar_startblock = cpu_to_be32(cur->bc_rec.a.ar_startblock);
217 rec->alloc.ar_blockcount = cpu_to_be32(cur->bc_rec.a.ar_blockcount);
218}
219
220STATIC void
221xfs_allocbt_init_ptr_from_cur(
222 struct xfs_btree_cur *cur,
223 union xfs_btree_ptr *ptr)
224{
225 struct xfs_agf *agf = cur->bc_ag.agbp->b_addr;
226
227 ASSERT(cur->bc_ag.pag->pag_agno == be32_to_cpu(agf->agf_seqno));
228
229 ptr->s = agf->agf_roots[cur->bc_btnum];
230}
231
232STATIC int64_t
233xfs_bnobt_key_diff(
234 struct xfs_btree_cur *cur,
235 const union xfs_btree_key *key)
236{
237 struct xfs_alloc_rec_incore *rec = &cur->bc_rec.a;
238 const struct xfs_alloc_rec *kp = &key->alloc;
239
240 return (int64_t)be32_to_cpu(kp->ar_startblock) - rec->ar_startblock;
241}
242
243STATIC int64_t
244xfs_cntbt_key_diff(
245 struct xfs_btree_cur *cur,
246 const union xfs_btree_key *key)
247{
248 struct xfs_alloc_rec_incore *rec = &cur->bc_rec.a;
249 const struct xfs_alloc_rec *kp = &key->alloc;
250 int64_t diff;
251
252 diff = (int64_t)be32_to_cpu(kp->ar_blockcount) - rec->ar_blockcount;
253 if (diff)
254 return diff;
255
256 return (int64_t)be32_to_cpu(kp->ar_startblock) - rec->ar_startblock;
257}
258
259STATIC int64_t
260xfs_bnobt_diff_two_keys(
261 struct xfs_btree_cur *cur,
262 const union xfs_btree_key *k1,
263 const union xfs_btree_key *k2,
264 const union xfs_btree_key *mask)
265{
266 ASSERT(!mask || mask->alloc.ar_startblock);
267
268 return (int64_t)be32_to_cpu(k1->alloc.ar_startblock) -
269 be32_to_cpu(k2->alloc.ar_startblock);
270}
271
272STATIC int64_t
273xfs_cntbt_diff_two_keys(
274 struct xfs_btree_cur *cur,
275 const union xfs_btree_key *k1,
276 const union xfs_btree_key *k2,
277 const union xfs_btree_key *mask)
278{
279 int64_t diff;
280
281 ASSERT(!mask || (mask->alloc.ar_blockcount &&
282 mask->alloc.ar_startblock));
283
284 diff = be32_to_cpu(k1->alloc.ar_blockcount) -
285 be32_to_cpu(k2->alloc.ar_blockcount);
286 if (diff)
287 return diff;
288
289 return be32_to_cpu(k1->alloc.ar_startblock) -
290 be32_to_cpu(k2->alloc.ar_startblock);
291}
292
293static xfs_failaddr_t
294xfs_allocbt_verify(
295 struct xfs_buf *bp)
296{
297 struct xfs_mount *mp = bp->b_mount;
298 struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
299 struct xfs_perag *pag = bp->b_pag;
300 xfs_failaddr_t fa;
301 unsigned int level;
302 xfs_btnum_t btnum = XFS_BTNUM_BNOi;
303
304 if (!xfs_verify_magic(bp, block->bb_magic))
305 return __this_address;
306
307 if (xfs_has_crc(mp)) {
308 fa = xfs_btree_sblock_v5hdr_verify(bp);
309 if (fa)
310 return fa;
311 }
312
313 /*
314 * The perag may not be attached during grow operations or fully
315 * initialized from the AGF during log recovery. Therefore we can only
316 * check against maximum tree depth from those contexts.
317 *
318 * Otherwise check against the per-tree limit. Peek at one of the
319 * verifier magic values to determine the type of tree we're verifying
320 * against.
321 */
322 level = be16_to_cpu(block->bb_level);
323 if (bp->b_ops->magic[0] == cpu_to_be32(XFS_ABTC_MAGIC))
324 btnum = XFS_BTNUM_CNTi;
325 if (pag && xfs_perag_initialised_agf(pag)) {
326 unsigned int maxlevel = pag->pagf_levels[btnum];
327
328#ifdef CONFIG_XFS_ONLINE_REPAIR
329 /*
330 * Online repair could be rewriting the free space btrees, so
331 * we'll validate against the larger of either tree while this
332 * is going on.
333 */
334 maxlevel = max_t(unsigned int, maxlevel,
335 pag->pagf_repair_levels[btnum]);
336#endif
337 if (level >= maxlevel)
338 return __this_address;
339 } else if (level >= mp->m_alloc_maxlevels)
340 return __this_address;
341
342 return xfs_btree_sblock_verify(bp, mp->m_alloc_mxr[level != 0]);
343}
344
345static void
346xfs_allocbt_read_verify(
347 struct xfs_buf *bp)
348{
349 xfs_failaddr_t fa;
350
351 if (!xfs_btree_sblock_verify_crc(bp))
352 xfs_verifier_error(bp, -EFSBADCRC, __this_address);
353 else {
354 fa = xfs_allocbt_verify(bp);
355 if (fa)
356 xfs_verifier_error(bp, -EFSCORRUPTED, fa);
357 }
358
359 if (bp->b_error)
360 trace_xfs_btree_corrupt(bp, _RET_IP_);
361}
362
363static void
364xfs_allocbt_write_verify(
365 struct xfs_buf *bp)
366{
367 xfs_failaddr_t fa;
368
369 fa = xfs_allocbt_verify(bp);
370 if (fa) {
371 trace_xfs_btree_corrupt(bp, _RET_IP_);
372 xfs_verifier_error(bp, -EFSCORRUPTED, fa);
373 return;
374 }
375 xfs_btree_sblock_calc_crc(bp);
376
377}
378
379const struct xfs_buf_ops xfs_bnobt_buf_ops = {
380 .name = "xfs_bnobt",
381 .magic = { cpu_to_be32(XFS_ABTB_MAGIC),
382 cpu_to_be32(XFS_ABTB_CRC_MAGIC) },
383 .verify_read = xfs_allocbt_read_verify,
384 .verify_write = xfs_allocbt_write_verify,
385 .verify_struct = xfs_allocbt_verify,
386};
387
388const struct xfs_buf_ops xfs_cntbt_buf_ops = {
389 .name = "xfs_cntbt",
390 .magic = { cpu_to_be32(XFS_ABTC_MAGIC),
391 cpu_to_be32(XFS_ABTC_CRC_MAGIC) },
392 .verify_read = xfs_allocbt_read_verify,
393 .verify_write = xfs_allocbt_write_verify,
394 .verify_struct = xfs_allocbt_verify,
395};
396
397STATIC int
398xfs_bnobt_keys_inorder(
399 struct xfs_btree_cur *cur,
400 const union xfs_btree_key *k1,
401 const union xfs_btree_key *k2)
402{
403 return be32_to_cpu(k1->alloc.ar_startblock) <
404 be32_to_cpu(k2->alloc.ar_startblock);
405}
406
407STATIC int
408xfs_bnobt_recs_inorder(
409 struct xfs_btree_cur *cur,
410 const union xfs_btree_rec *r1,
411 const union xfs_btree_rec *r2)
412{
413 return be32_to_cpu(r1->alloc.ar_startblock) +
414 be32_to_cpu(r1->alloc.ar_blockcount) <=
415 be32_to_cpu(r2->alloc.ar_startblock);
416}
417
418STATIC int
419xfs_cntbt_keys_inorder(
420 struct xfs_btree_cur *cur,
421 const union xfs_btree_key *k1,
422 const union xfs_btree_key *k2)
423{
424 return be32_to_cpu(k1->alloc.ar_blockcount) <
425 be32_to_cpu(k2->alloc.ar_blockcount) ||
426 (k1->alloc.ar_blockcount == k2->alloc.ar_blockcount &&
427 be32_to_cpu(k1->alloc.ar_startblock) <
428 be32_to_cpu(k2->alloc.ar_startblock));
429}
430
431STATIC int
432xfs_cntbt_recs_inorder(
433 struct xfs_btree_cur *cur,
434 const union xfs_btree_rec *r1,
435 const union xfs_btree_rec *r2)
436{
437 return be32_to_cpu(r1->alloc.ar_blockcount) <
438 be32_to_cpu(r2->alloc.ar_blockcount) ||
439 (r1->alloc.ar_blockcount == r2->alloc.ar_blockcount &&
440 be32_to_cpu(r1->alloc.ar_startblock) <
441 be32_to_cpu(r2->alloc.ar_startblock));
442}
443
444STATIC enum xbtree_key_contig
445xfs_allocbt_keys_contiguous(
446 struct xfs_btree_cur *cur,
447 const union xfs_btree_key *key1,
448 const union xfs_btree_key *key2,
449 const union xfs_btree_key *mask)
450{
451 ASSERT(!mask || mask->alloc.ar_startblock);
452
453 return xbtree_key_contig(be32_to_cpu(key1->alloc.ar_startblock),
454 be32_to_cpu(key2->alloc.ar_startblock));
455}
456
457static const struct xfs_btree_ops xfs_bnobt_ops = {
458 .rec_len = sizeof(xfs_alloc_rec_t),
459 .key_len = sizeof(xfs_alloc_key_t),
460
461 .dup_cursor = xfs_allocbt_dup_cursor,
462 .set_root = xfs_allocbt_set_root,
463 .alloc_block = xfs_allocbt_alloc_block,
464 .free_block = xfs_allocbt_free_block,
465 .update_lastrec = xfs_allocbt_update_lastrec,
466 .get_minrecs = xfs_allocbt_get_minrecs,
467 .get_maxrecs = xfs_allocbt_get_maxrecs,
468 .init_key_from_rec = xfs_allocbt_init_key_from_rec,
469 .init_high_key_from_rec = xfs_bnobt_init_high_key_from_rec,
470 .init_rec_from_cur = xfs_allocbt_init_rec_from_cur,
471 .init_ptr_from_cur = xfs_allocbt_init_ptr_from_cur,
472 .key_diff = xfs_bnobt_key_diff,
473 .buf_ops = &xfs_bnobt_buf_ops,
474 .diff_two_keys = xfs_bnobt_diff_two_keys,
475 .keys_inorder = xfs_bnobt_keys_inorder,
476 .recs_inorder = xfs_bnobt_recs_inorder,
477 .keys_contiguous = xfs_allocbt_keys_contiguous,
478};
479
480static const struct xfs_btree_ops xfs_cntbt_ops = {
481 .rec_len = sizeof(xfs_alloc_rec_t),
482 .key_len = sizeof(xfs_alloc_key_t),
483
484 .dup_cursor = xfs_allocbt_dup_cursor,
485 .set_root = xfs_allocbt_set_root,
486 .alloc_block = xfs_allocbt_alloc_block,
487 .free_block = xfs_allocbt_free_block,
488 .update_lastrec = xfs_allocbt_update_lastrec,
489 .get_minrecs = xfs_allocbt_get_minrecs,
490 .get_maxrecs = xfs_allocbt_get_maxrecs,
491 .init_key_from_rec = xfs_allocbt_init_key_from_rec,
492 .init_high_key_from_rec = xfs_cntbt_init_high_key_from_rec,
493 .init_rec_from_cur = xfs_allocbt_init_rec_from_cur,
494 .init_ptr_from_cur = xfs_allocbt_init_ptr_from_cur,
495 .key_diff = xfs_cntbt_key_diff,
496 .buf_ops = &xfs_cntbt_buf_ops,
497 .diff_two_keys = xfs_cntbt_diff_two_keys,
498 .keys_inorder = xfs_cntbt_keys_inorder,
499 .recs_inorder = xfs_cntbt_recs_inorder,
500 .keys_contiguous = NULL, /* not needed right now */
501};
502
503/* Allocate most of a new allocation btree cursor. */
504STATIC struct xfs_btree_cur *
505xfs_allocbt_init_common(
506 struct xfs_mount *mp,
507 struct xfs_trans *tp,
508 struct xfs_perag *pag,
509 xfs_btnum_t btnum)
510{
511 struct xfs_btree_cur *cur;
512
513 ASSERT(btnum == XFS_BTNUM_BNO || btnum == XFS_BTNUM_CNT);
514
515 cur = xfs_btree_alloc_cursor(mp, tp, btnum, mp->m_alloc_maxlevels,
516 xfs_allocbt_cur_cache);
517 cur->bc_ag.abt.active = false;
518
519 if (btnum == XFS_BTNUM_CNT) {
520 cur->bc_ops = &xfs_cntbt_ops;
521 cur->bc_statoff = XFS_STATS_CALC_INDEX(xs_abtc_2);
522 cur->bc_flags = XFS_BTREE_LASTREC_UPDATE;
523 } else {
524 cur->bc_ops = &xfs_bnobt_ops;
525 cur->bc_statoff = XFS_STATS_CALC_INDEX(xs_abtb_2);
526 }
527
528 cur->bc_ag.pag = xfs_perag_hold(pag);
529
530 if (xfs_has_crc(mp))
531 cur->bc_flags |= XFS_BTREE_CRC_BLOCKS;
532
533 return cur;
534}
535
536/*
537 * Allocate a new allocation btree cursor.
538 */
539struct xfs_btree_cur * /* new alloc btree cursor */
540xfs_allocbt_init_cursor(
541 struct xfs_mount *mp, /* file system mount point */
542 struct xfs_trans *tp, /* transaction pointer */
543 struct xfs_buf *agbp, /* buffer for agf structure */
544 struct xfs_perag *pag,
545 xfs_btnum_t btnum) /* btree identifier */
546{
547 struct xfs_agf *agf = agbp->b_addr;
548 struct xfs_btree_cur *cur;
549
550 cur = xfs_allocbt_init_common(mp, tp, pag, btnum);
551 if (btnum == XFS_BTNUM_CNT)
552 cur->bc_nlevels = be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNT]);
553 else
554 cur->bc_nlevels = be32_to_cpu(agf->agf_levels[XFS_BTNUM_BNO]);
555
556 cur->bc_ag.agbp = agbp;
557
558 return cur;
559}
560
561/* Create a free space btree cursor with a fake root for staging. */
562struct xfs_btree_cur *
563xfs_allocbt_stage_cursor(
564 struct xfs_mount *mp,
565 struct xbtree_afakeroot *afake,
566 struct xfs_perag *pag,
567 xfs_btnum_t btnum)
568{
569 struct xfs_btree_cur *cur;
570
571 cur = xfs_allocbt_init_common(mp, NULL, pag, btnum);
572 xfs_btree_stage_afakeroot(cur, afake);
573 return cur;
574}
575
576/*
577 * Install a new free space btree root. Caller is responsible for invalidating
578 * and freeing the old btree blocks.
579 */
580void
581xfs_allocbt_commit_staged_btree(
582 struct xfs_btree_cur *cur,
583 struct xfs_trans *tp,
584 struct xfs_buf *agbp)
585{
586 struct xfs_agf *agf = agbp->b_addr;
587 struct xbtree_afakeroot *afake = cur->bc_ag.afake;
588
589 ASSERT(cur->bc_flags & XFS_BTREE_STAGING);
590
591 agf->agf_roots[cur->bc_btnum] = cpu_to_be32(afake->af_root);
592 agf->agf_levels[cur->bc_btnum] = cpu_to_be32(afake->af_levels);
593 xfs_alloc_log_agf(tp, agbp, XFS_AGF_ROOTS | XFS_AGF_LEVELS);
594
595 if (cur->bc_btnum == XFS_BTNUM_BNO) {
596 xfs_btree_commit_afakeroot(cur, tp, agbp, &xfs_bnobt_ops);
597 } else {
598 cur->bc_flags |= XFS_BTREE_LASTREC_UPDATE;
599 xfs_btree_commit_afakeroot(cur, tp, agbp, &xfs_cntbt_ops);
600 }
601}
602
603/* Calculate number of records in an alloc btree block. */
604static inline unsigned int
605xfs_allocbt_block_maxrecs(
606 unsigned int blocklen,
607 bool leaf)
608{
609 if (leaf)
610 return blocklen / sizeof(xfs_alloc_rec_t);
611 return blocklen / (sizeof(xfs_alloc_key_t) + sizeof(xfs_alloc_ptr_t));
612}
613
614/*
615 * Calculate number of records in an alloc btree block.
616 */
617int
618xfs_allocbt_maxrecs(
619 struct xfs_mount *mp,
620 int blocklen,
621 int leaf)
622{
623 blocklen -= XFS_ALLOC_BLOCK_LEN(mp);
624 return xfs_allocbt_block_maxrecs(blocklen, leaf);
625}
626
627/* Free space btrees are at their largest when every other block is free. */
628#define XFS_MAX_FREESP_RECORDS ((XFS_MAX_AG_BLOCKS + 1) / 2)
629
630/* Compute the max possible height for free space btrees. */
631unsigned int
632xfs_allocbt_maxlevels_ondisk(void)
633{
634 unsigned int minrecs[2];
635 unsigned int blocklen;
636
637 blocklen = min(XFS_MIN_BLOCKSIZE - XFS_BTREE_SBLOCK_LEN,
638 XFS_MIN_CRC_BLOCKSIZE - XFS_BTREE_SBLOCK_CRC_LEN);
639
640 minrecs[0] = xfs_allocbt_block_maxrecs(blocklen, true) / 2;
641 minrecs[1] = xfs_allocbt_block_maxrecs(blocklen, false) / 2;
642
643 return xfs_btree_compute_maxlevels(minrecs, XFS_MAX_FREESP_RECORDS);
644}
645
646/* Calculate the freespace btree size for some records. */
647xfs_extlen_t
648xfs_allocbt_calc_size(
649 struct xfs_mount *mp,
650 unsigned long long len)
651{
652 return xfs_btree_calc_size(mp->m_alloc_mnr, len);
653}
654
655int __init
656xfs_allocbt_init_cur_cache(void)
657{
658 xfs_allocbt_cur_cache = kmem_cache_create("xfs_bnobt_cur",
659 xfs_btree_cur_sizeof(xfs_allocbt_maxlevels_ondisk()),
660 0, 0, NULL);
661
662 if (!xfs_allocbt_cur_cache)
663 return -ENOMEM;
664 return 0;
665}
666
667void
668xfs_allocbt_destroy_cur_cache(void)
669{
670 kmem_cache_destroy(xfs_allocbt_cur_cache);
671 xfs_allocbt_cur_cache = NULL;
672}
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
24static struct kmem_cache *xfs_allocbt_cur_cache;
25
26STATIC struct xfs_btree_cur *
27xfs_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
34STATIC struct xfs_btree_cur *
35xfs_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
43STATIC void
44xfs_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
67STATIC int
68xfs_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
97STATIC int
98xfs_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 */
121STATIC void
122xfs_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
179STATIC int
180xfs_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
187STATIC int
188xfs_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
195STATIC void
196xfs_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
204STATIC void
205xfs_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
217STATIC void
218xfs_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
226STATIC void
227xfs_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
235STATIC void
236xfs_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
250STATIC int64_t
251xfs_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
261STATIC int64_t
262xfs_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
277STATIC int64_t
278xfs_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
290STATIC int64_t
291xfs_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
311static xfs_failaddr_t
312xfs_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
368static void
369xfs_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
386static void
387xfs_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
402const 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
411const 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
420STATIC int
421xfs_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
430STATIC int
431xfs_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
441STATIC int
442xfs_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
454STATIC int
455xfs_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
467STATIC enum xbtree_key_contig
468xfs_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
480const 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
511const 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 */
548struct xfs_btree_cur *
549xfs_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 */
574struct xfs_btree_cur *
575xfs_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 */
599void
600xfs_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. */
623static inline unsigned int
624xfs_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 */
636int
637xfs_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. */
650unsigned int
651xfs_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. */
666xfs_extlen_t
667xfs_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
674int __init
675xfs_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
686void
687xfs_allocbt_destroy_cur_cache(void)
688{
689 kmem_cache_destroy(xfs_allocbt_cur_cache);
690 xfs_allocbt_cur_cache = NULL;
691}