Commit | Line | Data |
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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License as | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
9 | * This program is distributed in the hope that it would be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
1da177e4 | 13 | * |
7b718769 NS |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1da177e4 | 17 | */ |
1da177e4 | 18 | #include "xfs.h" |
a844f451 | 19 | #include "xfs_fs.h" |
632b89e8 | 20 | #include "xfs_shared.h" |
a4fbe6ab | 21 | #include "xfs_format.h" |
239880ef DC |
22 | #include "xfs_log_format.h" |
23 | #include "xfs_trans_resv.h" | |
1da177e4 | 24 | #include "xfs_sb.h" |
1da177e4 | 25 | #include "xfs_mount.h" |
1da177e4 | 26 | #include "xfs_btree.h" |
a4fbe6ab | 27 | #include "xfs_alloc_btree.h" |
1da177e4 | 28 | #include "xfs_alloc.h" |
efc27b52 | 29 | #include "xfs_extent_busy.h" |
1da177e4 | 30 | #include "xfs_error.h" |
0b1b213f | 31 | #include "xfs_trace.h" |
ee1a47ab | 32 | #include "xfs_cksum.h" |
239880ef | 33 | #include "xfs_trans.h" |
1da177e4 | 34 | |
1da177e4 | 35 | |
278d0ca1 CH |
36 | STATIC struct xfs_btree_cur * |
37 | xfs_allocbt_dup_cursor( | |
38 | struct xfs_btree_cur *cur) | |
39 | { | |
40 | return xfs_allocbt_init_cursor(cur->bc_mp, cur->bc_tp, | |
41 | cur->bc_private.a.agbp, cur->bc_private.a.agno, | |
42 | cur->bc_btnum); | |
43 | } | |
44 | ||
344207ce CH |
45 | STATIC void |
46 | xfs_allocbt_set_root( | |
47 | struct xfs_btree_cur *cur, | |
48 | union xfs_btree_ptr *ptr, | |
49 | int inc) | |
50 | { | |
51 | struct xfs_buf *agbp = cur->bc_private.a.agbp; | |
52 | struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp); | |
53 | xfs_agnumber_t seqno = be32_to_cpu(agf->agf_seqno); | |
54 | int btnum = cur->bc_btnum; | |
a862e0fd | 55 | struct xfs_perag *pag = xfs_perag_get(cur->bc_mp, seqno); |
344207ce CH |
56 | |
57 | ASSERT(ptr->s != 0); | |
58 | ||
59 | agf->agf_roots[btnum] = ptr->s; | |
60 | be32_add_cpu(&agf->agf_levels[btnum], inc); | |
a862e0fd DC |
61 | pag->pagf_levels[btnum] += inc; |
62 | xfs_perag_put(pag); | |
344207ce CH |
63 | |
64 | xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_ROOTS | XFS_AGF_LEVELS); | |
65 | } | |
66 | ||
f5eb8e7c CH |
67 | STATIC int |
68 | xfs_allocbt_alloc_block( | |
69 | struct xfs_btree_cur *cur, | |
70 | union xfs_btree_ptr *start, | |
71 | union xfs_btree_ptr *new, | |
f5eb8e7c CH |
72 | int *stat) |
73 | { | |
74 | int error; | |
75 | xfs_agblock_t bno; | |
76 | ||
77 | XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY); | |
78 | ||
79 | /* Allocate the new block from the freelist. If we can't, give up. */ | |
80 | error = xfs_alloc_get_freelist(cur->bc_tp, cur->bc_private.a.agbp, | |
81 | &bno, 1); | |
82 | if (error) { | |
83 | XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR); | |
84 | return error; | |
85 | } | |
86 | ||
87 | if (bno == NULLAGBLOCK) { | |
88 | XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT); | |
89 | *stat = 0; | |
90 | return 0; | |
91 | } | |
97d3ac75 | 92 | |
4ecbfe63 | 93 | xfs_extent_busy_reuse(cur->bc_mp, cur->bc_private.a.agno, bno, 1, false); |
f5eb8e7c CH |
94 | |
95 | xfs_trans_agbtree_delta(cur->bc_tp, 1); | |
96 | new->s = cpu_to_be32(bno); | |
97 | ||
98 | XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT); | |
99 | *stat = 1; | |
100 | return 0; | |
101 | } | |
102 | ||
d4b3a4b7 CH |
103 | STATIC int |
104 | xfs_allocbt_free_block( | |
105 | struct xfs_btree_cur *cur, | |
106 | struct xfs_buf *bp) | |
107 | { | |
108 | struct xfs_buf *agbp = cur->bc_private.a.agbp; | |
109 | struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp); | |
110 | xfs_agblock_t bno; | |
111 | int error; | |
112 | ||
b6e32227 | 113 | bno = xfs_daddr_to_agbno(cur->bc_mp, XFS_BUF_ADDR(bp)); |
d4b3a4b7 CH |
114 | error = xfs_alloc_put_freelist(cur->bc_tp, agbp, NULL, bno, 1); |
115 | if (error) | |
116 | return error; | |
117 | ||
4ecbfe63 DC |
118 | xfs_extent_busy_insert(cur->bc_tp, be32_to_cpu(agf->agf_seqno), bno, 1, |
119 | XFS_EXTENT_BUSY_SKIP_DISCARD); | |
d4b3a4b7 | 120 | xfs_trans_agbtree_delta(cur->bc_tp, -1); |
4c05f9ad DC |
121 | |
122 | xfs_trans_binval(cur->bc_tp, bp); | |
d4b3a4b7 CH |
123 | return 0; |
124 | } | |
125 | ||
1da177e4 | 126 | /* |
278d0ca1 | 127 | * Update the longest extent in the AGF |
1da177e4 | 128 | */ |
278d0ca1 CH |
129 | STATIC void |
130 | xfs_allocbt_update_lastrec( | |
131 | struct xfs_btree_cur *cur, | |
132 | struct xfs_btree_block *block, | |
133 | union xfs_btree_rec *rec, | |
134 | int ptr, | |
135 | int reason) | |
1da177e4 | 136 | { |
278d0ca1 CH |
137 | struct xfs_agf *agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp); |
138 | xfs_agnumber_t seqno = be32_to_cpu(agf->agf_seqno); | |
a862e0fd | 139 | struct xfs_perag *pag; |
278d0ca1 | 140 | __be32 len; |
91cca5df | 141 | int numrecs; |
1da177e4 | 142 | |
278d0ca1 | 143 | ASSERT(cur->bc_btnum == XFS_BTNUM_CNT); |
1da177e4 | 144 | |
278d0ca1 CH |
145 | switch (reason) { |
146 | case LASTREC_UPDATE: | |
1da177e4 | 147 | /* |
278d0ca1 CH |
148 | * If this is the last leaf block and it's the last record, |
149 | * then update the size of the longest extent in the AG. | |
1da177e4 | 150 | */ |
278d0ca1 CH |
151 | if (ptr != xfs_btree_get_numrecs(block)) |
152 | return; | |
153 | len = rec->alloc.ar_blockcount; | |
154 | break; | |
4b22a571 CH |
155 | case LASTREC_INSREC: |
156 | if (be32_to_cpu(rec->alloc.ar_blockcount) <= | |
157 | be32_to_cpu(agf->agf_longest)) | |
158 | return; | |
159 | len = rec->alloc.ar_blockcount; | |
91cca5df CH |
160 | break; |
161 | case LASTREC_DELREC: | |
162 | numrecs = xfs_btree_get_numrecs(block); | |
163 | if (ptr <= numrecs) | |
164 | return; | |
165 | ASSERT(ptr == numrecs + 1); | |
166 | ||
167 | if (numrecs) { | |
168 | xfs_alloc_rec_t *rrp; | |
169 | ||
136341b4 | 170 | rrp = XFS_ALLOC_REC_ADDR(cur->bc_mp, block, numrecs); |
91cca5df CH |
171 | len = rrp->ar_blockcount; |
172 | } else { | |
173 | len = 0; | |
174 | } | |
175 | ||
4b22a571 | 176 | break; |
278d0ca1 CH |
177 | default: |
178 | ASSERT(0); | |
179 | return; | |
1da177e4 | 180 | } |
561f7d17 | 181 | |
278d0ca1 | 182 | agf->agf_longest = len; |
a862e0fd DC |
183 | pag = xfs_perag_get(cur->bc_mp, seqno); |
184 | pag->pagf_longest = be32_to_cpu(len); | |
185 | xfs_perag_put(pag); | |
278d0ca1 | 186 | xfs_alloc_log_agf(cur->bc_tp, cur->bc_private.a.agbp, XFS_AGF_LONGEST); |
561f7d17 CH |
187 | } |
188 | ||
91cca5df CH |
189 | STATIC int |
190 | xfs_allocbt_get_minrecs( | |
191 | struct xfs_btree_cur *cur, | |
192 | int level) | |
193 | { | |
194 | return cur->bc_mp->m_alloc_mnr[level != 0]; | |
195 | } | |
196 | ||
ce5e42db CH |
197 | STATIC int |
198 | xfs_allocbt_get_maxrecs( | |
199 | struct xfs_btree_cur *cur, | |
200 | int level) | |
201 | { | |
202 | return cur->bc_mp->m_alloc_mxr[level != 0]; | |
203 | } | |
204 | ||
fe033cc8 CH |
205 | STATIC void |
206 | xfs_allocbt_init_key_from_rec( | |
207 | union xfs_btree_key *key, | |
208 | union xfs_btree_rec *rec) | |
209 | { | |
210 | ASSERT(rec->alloc.ar_startblock != 0); | |
211 | ||
212 | key->alloc.ar_startblock = rec->alloc.ar_startblock; | |
213 | key->alloc.ar_blockcount = rec->alloc.ar_blockcount; | |
214 | } | |
215 | ||
4b22a571 CH |
216 | STATIC void |
217 | xfs_allocbt_init_rec_from_key( | |
218 | union xfs_btree_key *key, | |
219 | union xfs_btree_rec *rec) | |
220 | { | |
221 | ASSERT(key->alloc.ar_startblock != 0); | |
222 | ||
223 | rec->alloc.ar_startblock = key->alloc.ar_startblock; | |
224 | rec->alloc.ar_blockcount = key->alloc.ar_blockcount; | |
225 | } | |
226 | ||
227 | STATIC void | |
228 | xfs_allocbt_init_rec_from_cur( | |
229 | struct xfs_btree_cur *cur, | |
230 | union xfs_btree_rec *rec) | |
231 | { | |
232 | ASSERT(cur->bc_rec.a.ar_startblock != 0); | |
233 | ||
234 | rec->alloc.ar_startblock = cpu_to_be32(cur->bc_rec.a.ar_startblock); | |
235 | rec->alloc.ar_blockcount = cpu_to_be32(cur->bc_rec.a.ar_blockcount); | |
236 | } | |
237 | ||
fe033cc8 CH |
238 | STATIC void |
239 | xfs_allocbt_init_ptr_from_cur( | |
240 | struct xfs_btree_cur *cur, | |
241 | union xfs_btree_ptr *ptr) | |
242 | { | |
243 | struct xfs_agf *agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp); | |
244 | ||
245 | ASSERT(cur->bc_private.a.agno == be32_to_cpu(agf->agf_seqno)); | |
246 | ASSERT(agf->agf_roots[cur->bc_btnum] != 0); | |
247 | ||
248 | ptr->s = agf->agf_roots[cur->bc_btnum]; | |
249 | } | |
250 | ||
251 | STATIC __int64_t | |
252 | xfs_allocbt_key_diff( | |
253 | struct xfs_btree_cur *cur, | |
254 | union xfs_btree_key *key) | |
255 | { | |
256 | xfs_alloc_rec_incore_t *rec = &cur->bc_rec.a; | |
257 | xfs_alloc_key_t *kp = &key->alloc; | |
258 | __int64_t diff; | |
259 | ||
260 | if (cur->bc_btnum == XFS_BTNUM_BNO) { | |
261 | return (__int64_t)be32_to_cpu(kp->ar_startblock) - | |
262 | rec->ar_startblock; | |
263 | } | |
264 | ||
265 | diff = (__int64_t)be32_to_cpu(kp->ar_blockcount) - rec->ar_blockcount; | |
266 | if (diff) | |
267 | return diff; | |
268 | ||
269 | return (__int64_t)be32_to_cpu(kp->ar_startblock) - rec->ar_startblock; | |
270 | } | |
271 | ||
ee1a47ab | 272 | static bool |
612cfbfe | 273 | xfs_allocbt_verify( |
3d3e6f64 DC |
274 | struct xfs_buf *bp) |
275 | { | |
276 | struct xfs_mount *mp = bp->b_target->bt_mount; | |
277 | struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp); | |
278 | struct xfs_perag *pag = bp->b_pag; | |
279 | unsigned int level; | |
3d3e6f64 DC |
280 | |
281 | /* | |
282 | * magic number and level verification | |
283 | * | |
ee1a47ab CH |
284 | * During growfs operations, we can't verify the exact level or owner as |
285 | * the perag is not fully initialised and hence not attached to the | |
286 | * buffer. In this case, check against the maximum tree depth. | |
287 | * | |
288 | * Similarly, during log recovery we will have a perag structure | |
289 | * attached, but the agf information will not yet have been initialised | |
290 | * from the on disk AGF. Again, we can only check against maximum limits | |
291 | * in this case. | |
3d3e6f64 DC |
292 | */ |
293 | level = be16_to_cpu(block->bb_level); | |
294 | switch (block->bb_magic) { | |
ee1a47ab CH |
295 | case cpu_to_be32(XFS_ABTB_CRC_MAGIC): |
296 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
297 | return false; | |
ce748eaa | 298 | if (!uuid_equal(&block->bb_u.s.bb_uuid, &mp->m_sb.sb_meta_uuid)) |
ee1a47ab CH |
299 | return false; |
300 | if (block->bb_u.s.bb_blkno != cpu_to_be64(bp->b_bn)) | |
301 | return false; | |
302 | if (pag && | |
303 | be32_to_cpu(block->bb_u.s.bb_owner) != pag->pag_agno) | |
304 | return false; | |
305 | /* fall through */ | |
3d3e6f64 | 306 | case cpu_to_be32(XFS_ABTB_MAGIC): |
ee1a47ab CH |
307 | if (pag && pag->pagf_init) { |
308 | if (level >= pag->pagf_levels[XFS_BTNUM_BNOi]) | |
309 | return false; | |
310 | } else if (level >= mp->m_ag_maxlevels) | |
311 | return false; | |
3d3e6f64 | 312 | break; |
ee1a47ab CH |
313 | case cpu_to_be32(XFS_ABTC_CRC_MAGIC): |
314 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
315 | return false; | |
ce748eaa | 316 | if (!uuid_equal(&block->bb_u.s.bb_uuid, &mp->m_sb.sb_meta_uuid)) |
ee1a47ab CH |
317 | return false; |
318 | if (block->bb_u.s.bb_blkno != cpu_to_be64(bp->b_bn)) | |
319 | return false; | |
320 | if (pag && | |
321 | be32_to_cpu(block->bb_u.s.bb_owner) != pag->pag_agno) | |
322 | return false; | |
323 | /* fall through */ | |
3d3e6f64 | 324 | case cpu_to_be32(XFS_ABTC_MAGIC): |
ee1a47ab CH |
325 | if (pag && pag->pagf_init) { |
326 | if (level >= pag->pagf_levels[XFS_BTNUM_CNTi]) | |
327 | return false; | |
328 | } else if (level >= mp->m_ag_maxlevels) | |
329 | return false; | |
3d3e6f64 DC |
330 | break; |
331 | default: | |
ee1a47ab | 332 | return false; |
3d3e6f64 DC |
333 | } |
334 | ||
335 | /* numrecs verification */ | |
ee1a47ab CH |
336 | if (be16_to_cpu(block->bb_numrecs) > mp->m_alloc_mxr[level != 0]) |
337 | return false; | |
3d3e6f64 DC |
338 | |
339 | /* sibling pointer verification */ | |
ee1a47ab CH |
340 | if (!block->bb_u.s.bb_leftsib || |
341 | (be32_to_cpu(block->bb_u.s.bb_leftsib) >= mp->m_sb.sb_agblocks && | |
342 | block->bb_u.s.bb_leftsib != cpu_to_be32(NULLAGBLOCK))) | |
343 | return false; | |
344 | if (!block->bb_u.s.bb_rightsib || | |
345 | (be32_to_cpu(block->bb_u.s.bb_rightsib) >= mp->m_sb.sb_agblocks && | |
346 | block->bb_u.s.bb_rightsib != cpu_to_be32(NULLAGBLOCK))) | |
347 | return false; | |
348 | ||
349 | return true; | |
612cfbfe | 350 | } |
3d3e6f64 | 351 | |
612cfbfe | 352 | static void |
1813dd64 | 353 | xfs_allocbt_read_verify( |
612cfbfe DC |
354 | struct xfs_buf *bp) |
355 | { | |
ce5028cf | 356 | if (!xfs_btree_sblock_verify_crc(bp)) |
2451337d | 357 | xfs_buf_ioerror(bp, -EFSBADCRC); |
ce5028cf | 358 | else if (!xfs_allocbt_verify(bp)) |
2451337d | 359 | xfs_buf_ioerror(bp, -EFSCORRUPTED); |
ce5028cf ES |
360 | |
361 | if (bp->b_error) { | |
362 | trace_xfs_btree_corrupt(bp, _RET_IP_); | |
363 | xfs_verifier_error(bp); | |
ee1a47ab | 364 | } |
612cfbfe DC |
365 | } |
366 | ||
1813dd64 DC |
367 | static void |
368 | xfs_allocbt_write_verify( | |
612cfbfe DC |
369 | struct xfs_buf *bp) |
370 | { | |
ee1a47ab CH |
371 | if (!xfs_allocbt_verify(bp)) { |
372 | trace_xfs_btree_corrupt(bp, _RET_IP_); | |
2451337d | 373 | xfs_buf_ioerror(bp, -EFSCORRUPTED); |
ce5028cf | 374 | xfs_verifier_error(bp); |
e0d2c23a | 375 | return; |
ee1a47ab CH |
376 | } |
377 | xfs_btree_sblock_calc_crc(bp); | |
378 | ||
3d3e6f64 DC |
379 | } |
380 | ||
1813dd64 | 381 | const struct xfs_buf_ops xfs_allocbt_buf_ops = { |
233135b7 | 382 | .name = "xfs_allocbt", |
1813dd64 DC |
383 | .verify_read = xfs_allocbt_read_verify, |
384 | .verify_write = xfs_allocbt_write_verify, | |
385 | }; | |
386 | ||
387 | ||
742ae1e3 | 388 | #if defined(DEBUG) || defined(XFS_WARN) |
4a26e66e CH |
389 | STATIC int |
390 | xfs_allocbt_keys_inorder( | |
391 | struct xfs_btree_cur *cur, | |
392 | union xfs_btree_key *k1, | |
393 | union xfs_btree_key *k2) | |
394 | { | |
395 | if (cur->bc_btnum == XFS_BTNUM_BNO) { | |
396 | return be32_to_cpu(k1->alloc.ar_startblock) < | |
397 | be32_to_cpu(k2->alloc.ar_startblock); | |
398 | } else { | |
399 | return be32_to_cpu(k1->alloc.ar_blockcount) < | |
400 | be32_to_cpu(k2->alloc.ar_blockcount) || | |
401 | (k1->alloc.ar_blockcount == k2->alloc.ar_blockcount && | |
402 | be32_to_cpu(k1->alloc.ar_startblock) < | |
403 | be32_to_cpu(k2->alloc.ar_startblock)); | |
404 | } | |
405 | } | |
406 | ||
407 | STATIC int | |
408 | xfs_allocbt_recs_inorder( | |
409 | struct xfs_btree_cur *cur, | |
410 | union xfs_btree_rec *r1, | |
411 | union xfs_btree_rec *r2) | |
412 | { | |
413 | if (cur->bc_btnum == XFS_BTNUM_BNO) { | |
414 | return be32_to_cpu(r1->alloc.ar_startblock) + | |
415 | be32_to_cpu(r1->alloc.ar_blockcount) <= | |
416 | be32_to_cpu(r2->alloc.ar_startblock); | |
417 | } else { | |
418 | return be32_to_cpu(r1->alloc.ar_blockcount) < | |
419 | be32_to_cpu(r2->alloc.ar_blockcount) || | |
420 | (r1->alloc.ar_blockcount == r2->alloc.ar_blockcount && | |
421 | be32_to_cpu(r1->alloc.ar_startblock) < | |
422 | be32_to_cpu(r2->alloc.ar_startblock)); | |
423 | } | |
424 | } | |
425 | #endif /* DEBUG */ | |
426 | ||
561f7d17 | 427 | static const struct xfs_btree_ops xfs_allocbt_ops = { |
65f1eaea CH |
428 | .rec_len = sizeof(xfs_alloc_rec_t), |
429 | .key_len = sizeof(xfs_alloc_key_t), | |
430 | ||
561f7d17 | 431 | .dup_cursor = xfs_allocbt_dup_cursor, |
344207ce | 432 | .set_root = xfs_allocbt_set_root, |
f5eb8e7c | 433 | .alloc_block = xfs_allocbt_alloc_block, |
d4b3a4b7 | 434 | .free_block = xfs_allocbt_free_block, |
278d0ca1 | 435 | .update_lastrec = xfs_allocbt_update_lastrec, |
91cca5df | 436 | .get_minrecs = xfs_allocbt_get_minrecs, |
ce5e42db | 437 | .get_maxrecs = xfs_allocbt_get_maxrecs, |
fe033cc8 | 438 | .init_key_from_rec = xfs_allocbt_init_key_from_rec, |
4b22a571 CH |
439 | .init_rec_from_key = xfs_allocbt_init_rec_from_key, |
440 | .init_rec_from_cur = xfs_allocbt_init_rec_from_cur, | |
fe033cc8 CH |
441 | .init_ptr_from_cur = xfs_allocbt_init_ptr_from_cur, |
442 | .key_diff = xfs_allocbt_key_diff, | |
1813dd64 | 443 | .buf_ops = &xfs_allocbt_buf_ops, |
742ae1e3 | 444 | #if defined(DEBUG) || defined(XFS_WARN) |
4a26e66e CH |
445 | .keys_inorder = xfs_allocbt_keys_inorder, |
446 | .recs_inorder = xfs_allocbt_recs_inorder, | |
447 | #endif | |
561f7d17 CH |
448 | }; |
449 | ||
450 | /* | |
451 | * Allocate a new allocation btree cursor. | |
452 | */ | |
453 | struct xfs_btree_cur * /* new alloc btree cursor */ | |
454 | xfs_allocbt_init_cursor( | |
455 | struct xfs_mount *mp, /* file system mount point */ | |
456 | struct xfs_trans *tp, /* transaction pointer */ | |
457 | struct xfs_buf *agbp, /* buffer for agf structure */ | |
458 | xfs_agnumber_t agno, /* allocation group number */ | |
459 | xfs_btnum_t btnum) /* btree identifier */ | |
460 | { | |
461 | struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp); | |
462 | struct xfs_btree_cur *cur; | |
463 | ||
464 | ASSERT(btnum == XFS_BTNUM_BNO || btnum == XFS_BTNUM_CNT); | |
465 | ||
466 | cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP); | |
467 | ||
468 | cur->bc_tp = tp; | |
469 | cur->bc_mp = mp; | |
561f7d17 CH |
470 | cur->bc_btnum = btnum; |
471 | cur->bc_blocklog = mp->m_sb.sb_blocklog; | |
561f7d17 | 472 | cur->bc_ops = &xfs_allocbt_ops; |
dec58f1d CH |
473 | |
474 | if (btnum == XFS_BTNUM_CNT) { | |
475 | cur->bc_nlevels = be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNT]); | |
278d0ca1 | 476 | cur->bc_flags = XFS_BTREE_LASTREC_UPDATE; |
dec58f1d CH |
477 | } else { |
478 | cur->bc_nlevels = be32_to_cpu(agf->agf_levels[XFS_BTNUM_BNO]); | |
479 | } | |
561f7d17 CH |
480 | |
481 | cur->bc_private.a.agbp = agbp; | |
482 | cur->bc_private.a.agno = agno; | |
483 | ||
ee1a47ab CH |
484 | if (xfs_sb_version_hascrc(&mp->m_sb)) |
485 | cur->bc_flags |= XFS_BTREE_CRC_BLOCKS; | |
486 | ||
561f7d17 CH |
487 | return cur; |
488 | } | |
60197e8d CH |
489 | |
490 | /* | |
491 | * Calculate number of records in an alloc btree block. | |
492 | */ | |
493 | int | |
494 | xfs_allocbt_maxrecs( | |
495 | struct xfs_mount *mp, | |
496 | int blocklen, | |
497 | int leaf) | |
498 | { | |
7cc95a82 | 499 | blocklen -= XFS_ALLOC_BLOCK_LEN(mp); |
60197e8d CH |
500 | |
501 | if (leaf) | |
502 | return blocklen / sizeof(xfs_alloc_rec_t); | |
503 | return blocklen / (sizeof(xfs_alloc_key_t) + sizeof(xfs_alloc_ptr_t)); | |
504 | } |