xfs: make the key parameters to all btree key comparison functions const
[linux-2.6-microblaze.git] / fs / xfs / libxfs / xfs_alloc_btree.c
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
23
24 STATIC struct xfs_btree_cur *
25 xfs_allocbt_dup_cursor(
26         struct xfs_btree_cur    *cur)
27 {
28         return xfs_allocbt_init_cursor(cur->bc_mp, cur->bc_tp,
29                         cur->bc_ag.agbp, cur->bc_ag.pag, cur->bc_btnum);
30 }
31
32 STATIC void
33 xfs_allocbt_set_root(
34         struct xfs_btree_cur    *cur,
35         union xfs_btree_ptr     *ptr,
36         int                     inc)
37 {
38         struct xfs_buf          *agbp = cur->bc_ag.agbp;
39         struct xfs_agf          *agf = agbp->b_addr;
40         int                     btnum = cur->bc_btnum;
41
42         ASSERT(ptr->s != 0);
43
44         agf->agf_roots[btnum] = ptr->s;
45         be32_add_cpu(&agf->agf_levels[btnum], inc);
46         cur->bc_ag.pag->pagf_levels[btnum] += inc;
47
48         xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_ROOTS | XFS_AGF_LEVELS);
49 }
50
51 STATIC int
52 xfs_allocbt_alloc_block(
53         struct xfs_btree_cur    *cur,
54         union xfs_btree_ptr     *start,
55         union xfs_btree_ptr     *new,
56         int                     *stat)
57 {
58         int                     error;
59         xfs_agblock_t           bno;
60
61         /* Allocate the new block from the freelist. If we can't, give up.  */
62         error = xfs_alloc_get_freelist(cur->bc_tp, cur->bc_ag.agbp,
63                                        &bno, 1);
64         if (error)
65                 return error;
66
67         if (bno == NULLAGBLOCK) {
68                 *stat = 0;
69                 return 0;
70         }
71
72         atomic64_inc(&cur->bc_mp->m_allocbt_blks);
73         xfs_extent_busy_reuse(cur->bc_mp, cur->bc_ag.agbp->b_pag, bno, 1, false);
74
75         new->s = cpu_to_be32(bno);
76
77         *stat = 1;
78         return 0;
79 }
80
81 STATIC int
82 xfs_allocbt_free_block(
83         struct xfs_btree_cur    *cur,
84         struct xfs_buf          *bp)
85 {
86         struct xfs_buf          *agbp = cur->bc_ag.agbp;
87         xfs_agblock_t           bno;
88         int                     error;
89
90         bno = xfs_daddr_to_agbno(cur->bc_mp, XFS_BUF_ADDR(bp));
91         error = xfs_alloc_put_freelist(cur->bc_tp, agbp, NULL, bno, 1);
92         if (error)
93                 return error;
94
95         atomic64_dec(&cur->bc_mp->m_allocbt_blks);
96         xfs_extent_busy_insert(cur->bc_tp, agbp->b_pag, bno, 1,
97                               XFS_EXTENT_BUSY_SKIP_DISCARD);
98         return 0;
99 }
100
101 /*
102  * Update the longest extent in the AGF
103  */
104 STATIC void
105 xfs_allocbt_update_lastrec(
106         struct xfs_btree_cur    *cur,
107         struct xfs_btree_block  *block,
108         union xfs_btree_rec     *rec,
109         int                     ptr,
110         int                     reason)
111 {
112         struct xfs_agf          *agf = cur->bc_ag.agbp->b_addr;
113         struct xfs_perag        *pag;
114         __be32                  len;
115         int                     numrecs;
116
117         ASSERT(cur->bc_btnum == XFS_BTNUM_CNT);
118
119         switch (reason) {
120         case LASTREC_UPDATE:
121                 /*
122                  * If this is the last leaf block and it's the last record,
123                  * then update the size of the longest extent in the AG.
124                  */
125                 if (ptr != xfs_btree_get_numrecs(block))
126                         return;
127                 len = rec->alloc.ar_blockcount;
128                 break;
129         case LASTREC_INSREC:
130                 if (be32_to_cpu(rec->alloc.ar_blockcount) <=
131                     be32_to_cpu(agf->agf_longest))
132                         return;
133                 len = rec->alloc.ar_blockcount;
134                 break;
135         case LASTREC_DELREC:
136                 numrecs = xfs_btree_get_numrecs(block);
137                 if (ptr <= numrecs)
138                         return;
139                 ASSERT(ptr == numrecs + 1);
140
141                 if (numrecs) {
142                         xfs_alloc_rec_t *rrp;
143
144                         rrp = XFS_ALLOC_REC_ADDR(cur->bc_mp, block, numrecs);
145                         len = rrp->ar_blockcount;
146                 } else {
147                         len = 0;
148                 }
149
150                 break;
151         default:
152                 ASSERT(0);
153                 return;
154         }
155
156         agf->agf_longest = len;
157         pag = cur->bc_ag.agbp->b_pag;
158         pag->pagf_longest = be32_to_cpu(len);
159         xfs_alloc_log_agf(cur->bc_tp, cur->bc_ag.agbp, XFS_AGF_LONGEST);
160 }
161
162 STATIC int
163 xfs_allocbt_get_minrecs(
164         struct xfs_btree_cur    *cur,
165         int                     level)
166 {
167         return cur->bc_mp->m_alloc_mnr[level != 0];
168 }
169
170 STATIC int
171 xfs_allocbt_get_maxrecs(
172         struct xfs_btree_cur    *cur,
173         int                     level)
174 {
175         return cur->bc_mp->m_alloc_mxr[level != 0];
176 }
177
178 STATIC void
179 xfs_allocbt_init_key_from_rec(
180         union xfs_btree_key     *key,
181         union xfs_btree_rec     *rec)
182 {
183         key->alloc.ar_startblock = rec->alloc.ar_startblock;
184         key->alloc.ar_blockcount = rec->alloc.ar_blockcount;
185 }
186
187 STATIC void
188 xfs_bnobt_init_high_key_from_rec(
189         union xfs_btree_key     *key,
190         union xfs_btree_rec     *rec)
191 {
192         __u32                   x;
193
194         x = be32_to_cpu(rec->alloc.ar_startblock);
195         x += be32_to_cpu(rec->alloc.ar_blockcount) - 1;
196         key->alloc.ar_startblock = cpu_to_be32(x);
197         key->alloc.ar_blockcount = 0;
198 }
199
200 STATIC void
201 xfs_cntbt_init_high_key_from_rec(
202         union xfs_btree_key     *key,
203         union xfs_btree_rec     *rec)
204 {
205         key->alloc.ar_blockcount = rec->alloc.ar_blockcount;
206         key->alloc.ar_startblock = 0;
207 }
208
209 STATIC void
210 xfs_allocbt_init_rec_from_cur(
211         struct xfs_btree_cur    *cur,
212         union xfs_btree_rec     *rec)
213 {
214         rec->alloc.ar_startblock = cpu_to_be32(cur->bc_rec.a.ar_startblock);
215         rec->alloc.ar_blockcount = cpu_to_be32(cur->bc_rec.a.ar_blockcount);
216 }
217
218 STATIC void
219 xfs_allocbt_init_ptr_from_cur(
220         struct xfs_btree_cur    *cur,
221         union xfs_btree_ptr     *ptr)
222 {
223         struct xfs_agf          *agf = cur->bc_ag.agbp->b_addr;
224
225         ASSERT(cur->bc_ag.pag->pag_agno == be32_to_cpu(agf->agf_seqno));
226
227         ptr->s = agf->agf_roots[cur->bc_btnum];
228 }
229
230 STATIC int64_t
231 xfs_bnobt_key_diff(
232         struct xfs_btree_cur            *cur,
233         const union xfs_btree_key       *key)
234 {
235         struct xfs_alloc_rec_incore     *rec = &cur->bc_rec.a;
236         const struct xfs_alloc_rec      *kp = &key->alloc;
237
238         return (int64_t)be32_to_cpu(kp->ar_startblock) - rec->ar_startblock;
239 }
240
241 STATIC int64_t
242 xfs_cntbt_key_diff(
243         struct xfs_btree_cur            *cur,
244         const union xfs_btree_key       *key)
245 {
246         struct xfs_alloc_rec_incore     *rec = &cur->bc_rec.a;
247         const struct xfs_alloc_rec      *kp = &key->alloc;
248         int64_t                         diff;
249
250         diff = (int64_t)be32_to_cpu(kp->ar_blockcount) - rec->ar_blockcount;
251         if (diff)
252                 return diff;
253
254         return (int64_t)be32_to_cpu(kp->ar_startblock) - rec->ar_startblock;
255 }
256
257 STATIC int64_t
258 xfs_bnobt_diff_two_keys(
259         struct xfs_btree_cur            *cur,
260         const union xfs_btree_key       *k1,
261         const union xfs_btree_key       *k2)
262 {
263         return (int64_t)be32_to_cpu(k1->alloc.ar_startblock) -
264                           be32_to_cpu(k2->alloc.ar_startblock);
265 }
266
267 STATIC int64_t
268 xfs_cntbt_diff_two_keys(
269         struct xfs_btree_cur            *cur,
270         const union xfs_btree_key       *k1,
271         const union xfs_btree_key       *k2)
272 {
273         int64_t                         diff;
274
275         diff =  be32_to_cpu(k1->alloc.ar_blockcount) -
276                 be32_to_cpu(k2->alloc.ar_blockcount);
277         if (diff)
278                 return diff;
279
280         return  be32_to_cpu(k1->alloc.ar_startblock) -
281                 be32_to_cpu(k2->alloc.ar_startblock);
282 }
283
284 static xfs_failaddr_t
285 xfs_allocbt_verify(
286         struct xfs_buf          *bp)
287 {
288         struct xfs_mount        *mp = bp->b_mount;
289         struct xfs_btree_block  *block = XFS_BUF_TO_BLOCK(bp);
290         struct xfs_perag        *pag = bp->b_pag;
291         xfs_failaddr_t          fa;
292         unsigned int            level;
293         xfs_btnum_t             btnum = XFS_BTNUM_BNOi;
294
295         if (!xfs_verify_magic(bp, block->bb_magic))
296                 return __this_address;
297
298         if (xfs_sb_version_hascrc(&mp->m_sb)) {
299                 fa = xfs_btree_sblock_v5hdr_verify(bp);
300                 if (fa)
301                         return fa;
302         }
303
304         /*
305          * The perag may not be attached during grow operations or fully
306          * initialized from the AGF during log recovery. Therefore we can only
307          * check against maximum tree depth from those contexts.
308          *
309          * Otherwise check against the per-tree limit. Peek at one of the
310          * verifier magic values to determine the type of tree we're verifying
311          * against.
312          */
313         level = be16_to_cpu(block->bb_level);
314         if (bp->b_ops->magic[0] == cpu_to_be32(XFS_ABTC_MAGIC))
315                 btnum = XFS_BTNUM_CNTi;
316         if (pag && pag->pagf_init) {
317                 if (level >= pag->pagf_levels[btnum])
318                         return __this_address;
319         } else if (level >= mp->m_ag_maxlevels)
320                 return __this_address;
321
322         return xfs_btree_sblock_verify(bp, mp->m_alloc_mxr[level != 0]);
323 }
324
325 static void
326 xfs_allocbt_read_verify(
327         struct xfs_buf  *bp)
328 {
329         xfs_failaddr_t  fa;
330
331         if (!xfs_btree_sblock_verify_crc(bp))
332                 xfs_verifier_error(bp, -EFSBADCRC, __this_address);
333         else {
334                 fa = xfs_allocbt_verify(bp);
335                 if (fa)
336                         xfs_verifier_error(bp, -EFSCORRUPTED, fa);
337         }
338
339         if (bp->b_error)
340                 trace_xfs_btree_corrupt(bp, _RET_IP_);
341 }
342
343 static void
344 xfs_allocbt_write_verify(
345         struct xfs_buf  *bp)
346 {
347         xfs_failaddr_t  fa;
348
349         fa = xfs_allocbt_verify(bp);
350         if (fa) {
351                 trace_xfs_btree_corrupt(bp, _RET_IP_);
352                 xfs_verifier_error(bp, -EFSCORRUPTED, fa);
353                 return;
354         }
355         xfs_btree_sblock_calc_crc(bp);
356
357 }
358
359 const struct xfs_buf_ops xfs_bnobt_buf_ops = {
360         .name = "xfs_bnobt",
361         .magic = { cpu_to_be32(XFS_ABTB_MAGIC),
362                    cpu_to_be32(XFS_ABTB_CRC_MAGIC) },
363         .verify_read = xfs_allocbt_read_verify,
364         .verify_write = xfs_allocbt_write_verify,
365         .verify_struct = xfs_allocbt_verify,
366 };
367
368 const struct xfs_buf_ops xfs_cntbt_buf_ops = {
369         .name = "xfs_cntbt",
370         .magic = { cpu_to_be32(XFS_ABTC_MAGIC),
371                    cpu_to_be32(XFS_ABTC_CRC_MAGIC) },
372         .verify_read = xfs_allocbt_read_verify,
373         .verify_write = xfs_allocbt_write_verify,
374         .verify_struct = xfs_allocbt_verify,
375 };
376
377 STATIC int
378 xfs_bnobt_keys_inorder(
379         struct xfs_btree_cur    *cur,
380         union xfs_btree_key     *k1,
381         union xfs_btree_key     *k2)
382 {
383         return be32_to_cpu(k1->alloc.ar_startblock) <
384                be32_to_cpu(k2->alloc.ar_startblock);
385 }
386
387 STATIC int
388 xfs_bnobt_recs_inorder(
389         struct xfs_btree_cur    *cur,
390         union xfs_btree_rec     *r1,
391         union xfs_btree_rec     *r2)
392 {
393         return be32_to_cpu(r1->alloc.ar_startblock) +
394                 be32_to_cpu(r1->alloc.ar_blockcount) <=
395                 be32_to_cpu(r2->alloc.ar_startblock);
396 }
397
398 STATIC int
399 xfs_cntbt_keys_inorder(
400         struct xfs_btree_cur    *cur,
401         union xfs_btree_key     *k1,
402         union xfs_btree_key     *k2)
403 {
404         return be32_to_cpu(k1->alloc.ar_blockcount) <
405                 be32_to_cpu(k2->alloc.ar_blockcount) ||
406                 (k1->alloc.ar_blockcount == k2->alloc.ar_blockcount &&
407                  be32_to_cpu(k1->alloc.ar_startblock) <
408                  be32_to_cpu(k2->alloc.ar_startblock));
409 }
410
411 STATIC int
412 xfs_cntbt_recs_inorder(
413         struct xfs_btree_cur    *cur,
414         union xfs_btree_rec     *r1,
415         union xfs_btree_rec     *r2)
416 {
417         return be32_to_cpu(r1->alloc.ar_blockcount) <
418                 be32_to_cpu(r2->alloc.ar_blockcount) ||
419                 (r1->alloc.ar_blockcount == r2->alloc.ar_blockcount &&
420                  be32_to_cpu(r1->alloc.ar_startblock) <
421                  be32_to_cpu(r2->alloc.ar_startblock));
422 }
423
424 static const struct xfs_btree_ops xfs_bnobt_ops = {
425         .rec_len                = sizeof(xfs_alloc_rec_t),
426         .key_len                = sizeof(xfs_alloc_key_t),
427
428         .dup_cursor             = xfs_allocbt_dup_cursor,
429         .set_root               = xfs_allocbt_set_root,
430         .alloc_block            = xfs_allocbt_alloc_block,
431         .free_block             = xfs_allocbt_free_block,
432         .update_lastrec         = xfs_allocbt_update_lastrec,
433         .get_minrecs            = xfs_allocbt_get_minrecs,
434         .get_maxrecs            = xfs_allocbt_get_maxrecs,
435         .init_key_from_rec      = xfs_allocbt_init_key_from_rec,
436         .init_high_key_from_rec = xfs_bnobt_init_high_key_from_rec,
437         .init_rec_from_cur      = xfs_allocbt_init_rec_from_cur,
438         .init_ptr_from_cur      = xfs_allocbt_init_ptr_from_cur,
439         .key_diff               = xfs_bnobt_key_diff,
440         .buf_ops                = &xfs_bnobt_buf_ops,
441         .diff_two_keys          = xfs_bnobt_diff_two_keys,
442         .keys_inorder           = xfs_bnobt_keys_inorder,
443         .recs_inorder           = xfs_bnobt_recs_inorder,
444 };
445
446 static const struct xfs_btree_ops xfs_cntbt_ops = {
447         .rec_len                = sizeof(xfs_alloc_rec_t),
448         .key_len                = sizeof(xfs_alloc_key_t),
449
450         .dup_cursor             = xfs_allocbt_dup_cursor,
451         .set_root               = xfs_allocbt_set_root,
452         .alloc_block            = xfs_allocbt_alloc_block,
453         .free_block             = xfs_allocbt_free_block,
454         .update_lastrec         = xfs_allocbt_update_lastrec,
455         .get_minrecs            = xfs_allocbt_get_minrecs,
456         .get_maxrecs            = xfs_allocbt_get_maxrecs,
457         .init_key_from_rec      = xfs_allocbt_init_key_from_rec,
458         .init_high_key_from_rec = xfs_cntbt_init_high_key_from_rec,
459         .init_rec_from_cur      = xfs_allocbt_init_rec_from_cur,
460         .init_ptr_from_cur      = xfs_allocbt_init_ptr_from_cur,
461         .key_diff               = xfs_cntbt_key_diff,
462         .buf_ops                = &xfs_cntbt_buf_ops,
463         .diff_two_keys          = xfs_cntbt_diff_two_keys,
464         .keys_inorder           = xfs_cntbt_keys_inorder,
465         .recs_inorder           = xfs_cntbt_recs_inorder,
466 };
467
468 /* Allocate most of a new allocation btree cursor. */
469 STATIC struct xfs_btree_cur *
470 xfs_allocbt_init_common(
471         struct xfs_mount        *mp,
472         struct xfs_trans        *tp,
473         struct xfs_perag        *pag,
474         xfs_btnum_t             btnum)
475 {
476         struct xfs_btree_cur    *cur;
477
478         ASSERT(btnum == XFS_BTNUM_BNO || btnum == XFS_BTNUM_CNT);
479
480         cur = kmem_cache_zalloc(xfs_btree_cur_zone, GFP_NOFS | __GFP_NOFAIL);
481
482         cur->bc_tp = tp;
483         cur->bc_mp = mp;
484         cur->bc_btnum = btnum;
485         cur->bc_blocklog = mp->m_sb.sb_blocklog;
486         cur->bc_ag.abt.active = false;
487
488         if (btnum == XFS_BTNUM_CNT) {
489                 cur->bc_ops = &xfs_cntbt_ops;
490                 cur->bc_statoff = XFS_STATS_CALC_INDEX(xs_abtc_2);
491                 cur->bc_flags = XFS_BTREE_LASTREC_UPDATE;
492         } else {
493                 cur->bc_ops = &xfs_bnobt_ops;
494                 cur->bc_statoff = XFS_STATS_CALC_INDEX(xs_abtb_2);
495         }
496
497         /* take a reference for the cursor */
498         atomic_inc(&pag->pag_ref);
499         cur->bc_ag.pag = pag;
500
501         if (xfs_sb_version_hascrc(&mp->m_sb))
502                 cur->bc_flags |= XFS_BTREE_CRC_BLOCKS;
503
504         return cur;
505 }
506
507 /*
508  * Allocate a new allocation btree cursor.
509  */
510 struct xfs_btree_cur *                  /* new alloc btree cursor */
511 xfs_allocbt_init_cursor(
512         struct xfs_mount        *mp,            /* file system mount point */
513         struct xfs_trans        *tp,            /* transaction pointer */
514         struct xfs_buf          *agbp,          /* buffer for agf structure */
515         struct xfs_perag        *pag,
516         xfs_btnum_t             btnum)          /* btree identifier */
517 {
518         struct xfs_agf          *agf = agbp->b_addr;
519         struct xfs_btree_cur    *cur;
520
521         cur = xfs_allocbt_init_common(mp, tp, pag, btnum);
522         if (btnum == XFS_BTNUM_CNT)
523                 cur->bc_nlevels = be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNT]);
524         else
525                 cur->bc_nlevels = be32_to_cpu(agf->agf_levels[XFS_BTNUM_BNO]);
526
527         cur->bc_ag.agbp = agbp;
528
529         return cur;
530 }
531
532 /* Create a free space btree cursor with a fake root for staging. */
533 struct xfs_btree_cur *
534 xfs_allocbt_stage_cursor(
535         struct xfs_mount        *mp,
536         struct xbtree_afakeroot *afake,
537         struct xfs_perag        *pag,
538         xfs_btnum_t             btnum)
539 {
540         struct xfs_btree_cur    *cur;
541
542         cur = xfs_allocbt_init_common(mp, NULL, pag, btnum);
543         xfs_btree_stage_afakeroot(cur, afake);
544         return cur;
545 }
546
547 /*
548  * Install a new free space btree root.  Caller is responsible for invalidating
549  * and freeing the old btree blocks.
550  */
551 void
552 xfs_allocbt_commit_staged_btree(
553         struct xfs_btree_cur    *cur,
554         struct xfs_trans        *tp,
555         struct xfs_buf          *agbp)
556 {
557         struct xfs_agf          *agf = agbp->b_addr;
558         struct xbtree_afakeroot *afake = cur->bc_ag.afake;
559
560         ASSERT(cur->bc_flags & XFS_BTREE_STAGING);
561
562         agf->agf_roots[cur->bc_btnum] = cpu_to_be32(afake->af_root);
563         agf->agf_levels[cur->bc_btnum] = cpu_to_be32(afake->af_levels);
564         xfs_alloc_log_agf(tp, agbp, XFS_AGF_ROOTS | XFS_AGF_LEVELS);
565
566         if (cur->bc_btnum == XFS_BTNUM_BNO) {
567                 xfs_btree_commit_afakeroot(cur, tp, agbp, &xfs_bnobt_ops);
568         } else {
569                 cur->bc_flags |= XFS_BTREE_LASTREC_UPDATE;
570                 xfs_btree_commit_afakeroot(cur, tp, agbp, &xfs_cntbt_ops);
571         }
572 }
573
574 /*
575  * Calculate number of records in an alloc btree block.
576  */
577 int
578 xfs_allocbt_maxrecs(
579         struct xfs_mount        *mp,
580         int                     blocklen,
581         int                     leaf)
582 {
583         blocklen -= XFS_ALLOC_BLOCK_LEN(mp);
584
585         if (leaf)
586                 return blocklen / sizeof(xfs_alloc_rec_t);
587         return blocklen / (sizeof(xfs_alloc_key_t) + sizeof(xfs_alloc_ptr_t));
588 }
589
590 /* Calculate the freespace btree size for some records. */
591 xfs_extlen_t
592 xfs_allocbt_calc_size(
593         struct xfs_mount        *mp,
594         unsigned long long      len)
595 {
596         return xfs_btree_calc_size(mp->m_alloc_mnr, len);
597 }