Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 2 | * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc. |
| 3 | * All Rights Reserved. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 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 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * published by the Free Software Foundation. |
| 8 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 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. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 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 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include "xfs.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 19 | #include "xfs_fs.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include "xfs_types.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include "xfs_log.h" |
| 22 | #include "xfs_trans.h" |
| 23 | #include "xfs_sb.h" |
| 24 | #include "xfs_ag.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include "xfs_mount.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 26 | #include "xfs_bmap_btree.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include "xfs_alloc_btree.h" |
| 28 | #include "xfs_ialloc_btree.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 29 | #include "xfs_dinode.h" |
| 30 | #include "xfs_inode.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include "xfs_btree.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include "xfs_alloc.h" |
Dave Chinner | efc27b5 | 2012-04-29 10:39:43 +0000 | [diff] [blame] | 33 | #include "xfs_extent_busy.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include "xfs_error.h" |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 35 | #include "xfs_trace.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
Christoph Hellwig | 561f7d1 | 2008-10-30 16:53:59 +1100 | [diff] [blame] | 38 | STATIC struct xfs_btree_cur * |
| 39 | xfs_allocbt_dup_cursor( |
| 40 | struct xfs_btree_cur *cur) |
| 41 | { |
| 42 | return xfs_allocbt_init_cursor(cur->bc_mp, cur->bc_tp, |
| 43 | cur->bc_private.a.agbp, cur->bc_private.a.agno, |
| 44 | cur->bc_btnum); |
| 45 | } |
| 46 | |
Christoph Hellwig | 344207c | 2008-10-30 16:57:16 +1100 | [diff] [blame] | 47 | STATIC void |
| 48 | xfs_allocbt_set_root( |
| 49 | struct xfs_btree_cur *cur, |
| 50 | union xfs_btree_ptr *ptr, |
| 51 | int inc) |
| 52 | { |
| 53 | struct xfs_buf *agbp = cur->bc_private.a.agbp; |
| 54 | struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp); |
| 55 | xfs_agnumber_t seqno = be32_to_cpu(agf->agf_seqno); |
| 56 | int btnum = cur->bc_btnum; |
Dave Chinner | a862e0f | 2010-01-11 11:47:41 +0000 | [diff] [blame] | 57 | struct xfs_perag *pag = xfs_perag_get(cur->bc_mp, seqno); |
Christoph Hellwig | 344207c | 2008-10-30 16:57:16 +1100 | [diff] [blame] | 58 | |
| 59 | ASSERT(ptr->s != 0); |
| 60 | |
| 61 | agf->agf_roots[btnum] = ptr->s; |
| 62 | be32_add_cpu(&agf->agf_levels[btnum], inc); |
Dave Chinner | a862e0f | 2010-01-11 11:47:41 +0000 | [diff] [blame] | 63 | pag->pagf_levels[btnum] += inc; |
| 64 | xfs_perag_put(pag); |
Christoph Hellwig | 344207c | 2008-10-30 16:57:16 +1100 | [diff] [blame] | 65 | |
| 66 | xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_ROOTS | XFS_AGF_LEVELS); |
| 67 | } |
| 68 | |
Christoph Hellwig | f5eb8e7 | 2008-10-30 16:57:03 +1100 | [diff] [blame] | 69 | STATIC int |
| 70 | xfs_allocbt_alloc_block( |
| 71 | struct xfs_btree_cur *cur, |
| 72 | union xfs_btree_ptr *start, |
| 73 | union xfs_btree_ptr *new, |
| 74 | int length, |
| 75 | int *stat) |
| 76 | { |
| 77 | int error; |
| 78 | xfs_agblock_t bno; |
| 79 | |
| 80 | XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY); |
| 81 | |
| 82 | /* Allocate the new block from the freelist. If we can't, give up. */ |
| 83 | error = xfs_alloc_get_freelist(cur->bc_tp, cur->bc_private.a.agbp, |
| 84 | &bno, 1); |
| 85 | if (error) { |
| 86 | XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR); |
| 87 | return error; |
| 88 | } |
| 89 | |
| 90 | if (bno == NULLAGBLOCK) { |
| 91 | XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT); |
| 92 | *stat = 0; |
| 93 | return 0; |
| 94 | } |
Christoph Hellwig | 97d3ac7 | 2011-04-24 19:06:16 +0000 | [diff] [blame] | 95 | |
Dave Chinner | 4ecbfe6 | 2012-04-29 10:41:10 +0000 | [diff] [blame] | 96 | xfs_extent_busy_reuse(cur->bc_mp, cur->bc_private.a.agno, bno, 1, false); |
Christoph Hellwig | f5eb8e7 | 2008-10-30 16:57:03 +1100 | [diff] [blame] | 97 | |
| 98 | xfs_trans_agbtree_delta(cur->bc_tp, 1); |
| 99 | new->s = cpu_to_be32(bno); |
| 100 | |
| 101 | XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT); |
| 102 | *stat = 1; |
| 103 | return 0; |
| 104 | } |
| 105 | |
Christoph Hellwig | d4b3a4b | 2008-10-30 16:57:51 +1100 | [diff] [blame] | 106 | STATIC int |
| 107 | xfs_allocbt_free_block( |
| 108 | struct xfs_btree_cur *cur, |
| 109 | struct xfs_buf *bp) |
| 110 | { |
| 111 | struct xfs_buf *agbp = cur->bc_private.a.agbp; |
| 112 | struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp); |
| 113 | xfs_agblock_t bno; |
| 114 | int error; |
| 115 | |
Eric Sandeen | b6e3222 | 2009-01-14 23:22:07 -0600 | [diff] [blame] | 116 | bno = xfs_daddr_to_agbno(cur->bc_mp, XFS_BUF_ADDR(bp)); |
Christoph Hellwig | d4b3a4b | 2008-10-30 16:57:51 +1100 | [diff] [blame] | 117 | error = xfs_alloc_put_freelist(cur->bc_tp, agbp, NULL, bno, 1); |
| 118 | if (error) |
| 119 | return error; |
| 120 | |
Dave Chinner | 4ecbfe6 | 2012-04-29 10:41:10 +0000 | [diff] [blame] | 121 | xfs_extent_busy_insert(cur->bc_tp, be32_to_cpu(agf->agf_seqno), bno, 1, |
| 122 | XFS_EXTENT_BUSY_SKIP_DISCARD); |
Christoph Hellwig | d4b3a4b | 2008-10-30 16:57:51 +1100 | [diff] [blame] | 123 | xfs_trans_agbtree_delta(cur->bc_tp, -1); |
Dave Chinner | ca250b1 | 2012-11-02 11:38:41 +1100 | [diff] [blame] | 124 | |
| 125 | xfs_trans_binval(cur->bc_tp, bp); |
Christoph Hellwig | d4b3a4b | 2008-10-30 16:57:51 +1100 | [diff] [blame] | 126 | return 0; |
| 127 | } |
| 128 | |
Christoph Hellwig | 278d0ca | 2008-10-30 16:56:32 +1100 | [diff] [blame] | 129 | /* |
| 130 | * Update the longest extent in the AGF |
| 131 | */ |
| 132 | STATIC void |
| 133 | xfs_allocbt_update_lastrec( |
| 134 | struct xfs_btree_cur *cur, |
| 135 | struct xfs_btree_block *block, |
| 136 | union xfs_btree_rec *rec, |
| 137 | int ptr, |
| 138 | int reason) |
| 139 | { |
| 140 | struct xfs_agf *agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp); |
| 141 | xfs_agnumber_t seqno = be32_to_cpu(agf->agf_seqno); |
Dave Chinner | a862e0f | 2010-01-11 11:47:41 +0000 | [diff] [blame] | 142 | struct xfs_perag *pag; |
Christoph Hellwig | 278d0ca | 2008-10-30 16:56:32 +1100 | [diff] [blame] | 143 | __be32 len; |
Christoph Hellwig | 91cca5df | 2008-10-30 16:58:01 +1100 | [diff] [blame] | 144 | int numrecs; |
Christoph Hellwig | 278d0ca | 2008-10-30 16:56:32 +1100 | [diff] [blame] | 145 | |
| 146 | ASSERT(cur->bc_btnum == XFS_BTNUM_CNT); |
| 147 | |
| 148 | switch (reason) { |
| 149 | case LASTREC_UPDATE: |
| 150 | /* |
| 151 | * If this is the last leaf block and it's the last record, |
| 152 | * then update the size of the longest extent in the AG. |
| 153 | */ |
| 154 | if (ptr != xfs_btree_get_numrecs(block)) |
| 155 | return; |
| 156 | len = rec->alloc.ar_blockcount; |
| 157 | break; |
Christoph Hellwig | 4b22a57 | 2008-10-30 16:57:40 +1100 | [diff] [blame] | 158 | case LASTREC_INSREC: |
| 159 | if (be32_to_cpu(rec->alloc.ar_blockcount) <= |
| 160 | be32_to_cpu(agf->agf_longest)) |
| 161 | return; |
| 162 | len = rec->alloc.ar_blockcount; |
| 163 | break; |
Christoph Hellwig | 91cca5df | 2008-10-30 16:58:01 +1100 | [diff] [blame] | 164 | case LASTREC_DELREC: |
| 165 | numrecs = xfs_btree_get_numrecs(block); |
| 166 | if (ptr <= numrecs) |
| 167 | return; |
| 168 | ASSERT(ptr == numrecs + 1); |
| 169 | |
| 170 | if (numrecs) { |
| 171 | xfs_alloc_rec_t *rrp; |
| 172 | |
Christoph Hellwig | 136341b | 2008-10-30 17:11:40 +1100 | [diff] [blame] | 173 | rrp = XFS_ALLOC_REC_ADDR(cur->bc_mp, block, numrecs); |
Christoph Hellwig | 91cca5df | 2008-10-30 16:58:01 +1100 | [diff] [blame] | 174 | len = rrp->ar_blockcount; |
| 175 | } else { |
| 176 | len = 0; |
| 177 | } |
| 178 | |
| 179 | break; |
Christoph Hellwig | 278d0ca | 2008-10-30 16:56:32 +1100 | [diff] [blame] | 180 | default: |
| 181 | ASSERT(0); |
| 182 | return; |
| 183 | } |
| 184 | |
| 185 | agf->agf_longest = len; |
Dave Chinner | a862e0f | 2010-01-11 11:47:41 +0000 | [diff] [blame] | 186 | pag = xfs_perag_get(cur->bc_mp, seqno); |
| 187 | pag->pagf_longest = be32_to_cpu(len); |
| 188 | xfs_perag_put(pag); |
Christoph Hellwig | 278d0ca | 2008-10-30 16:56:32 +1100 | [diff] [blame] | 189 | xfs_alloc_log_agf(cur->bc_tp, cur->bc_private.a.agbp, XFS_AGF_LONGEST); |
| 190 | } |
| 191 | |
Christoph Hellwig | ce5e42d | 2008-10-30 16:55:23 +1100 | [diff] [blame] | 192 | STATIC int |
Christoph Hellwig | 91cca5df | 2008-10-30 16:58:01 +1100 | [diff] [blame] | 193 | xfs_allocbt_get_minrecs( |
| 194 | struct xfs_btree_cur *cur, |
| 195 | int level) |
| 196 | { |
| 197 | return cur->bc_mp->m_alloc_mnr[level != 0]; |
| 198 | } |
| 199 | |
| 200 | STATIC int |
Christoph Hellwig | ce5e42d | 2008-10-30 16:55:23 +1100 | [diff] [blame] | 201 | xfs_allocbt_get_maxrecs( |
| 202 | struct xfs_btree_cur *cur, |
| 203 | int level) |
| 204 | { |
| 205 | return cur->bc_mp->m_alloc_mxr[level != 0]; |
| 206 | } |
| 207 | |
Christoph Hellwig | fe033cc | 2008-10-30 16:56:09 +1100 | [diff] [blame] | 208 | STATIC void |
| 209 | xfs_allocbt_init_key_from_rec( |
| 210 | union xfs_btree_key *key, |
| 211 | union xfs_btree_rec *rec) |
| 212 | { |
| 213 | ASSERT(rec->alloc.ar_startblock != 0); |
| 214 | |
| 215 | key->alloc.ar_startblock = rec->alloc.ar_startblock; |
| 216 | key->alloc.ar_blockcount = rec->alloc.ar_blockcount; |
| 217 | } |
| 218 | |
| 219 | STATIC void |
Christoph Hellwig | 4b22a57 | 2008-10-30 16:57:40 +1100 | [diff] [blame] | 220 | xfs_allocbt_init_rec_from_key( |
| 221 | union xfs_btree_key *key, |
| 222 | union xfs_btree_rec *rec) |
| 223 | { |
| 224 | ASSERT(key->alloc.ar_startblock != 0); |
| 225 | |
| 226 | rec->alloc.ar_startblock = key->alloc.ar_startblock; |
| 227 | rec->alloc.ar_blockcount = key->alloc.ar_blockcount; |
| 228 | } |
| 229 | |
| 230 | STATIC void |
| 231 | xfs_allocbt_init_rec_from_cur( |
| 232 | struct xfs_btree_cur *cur, |
| 233 | union xfs_btree_rec *rec) |
| 234 | { |
| 235 | ASSERT(cur->bc_rec.a.ar_startblock != 0); |
| 236 | |
| 237 | rec->alloc.ar_startblock = cpu_to_be32(cur->bc_rec.a.ar_startblock); |
| 238 | rec->alloc.ar_blockcount = cpu_to_be32(cur->bc_rec.a.ar_blockcount); |
| 239 | } |
| 240 | |
| 241 | STATIC void |
Christoph Hellwig | fe033cc | 2008-10-30 16:56:09 +1100 | [diff] [blame] | 242 | xfs_allocbt_init_ptr_from_cur( |
| 243 | struct xfs_btree_cur *cur, |
| 244 | union xfs_btree_ptr *ptr) |
| 245 | { |
| 246 | struct xfs_agf *agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp); |
| 247 | |
| 248 | ASSERT(cur->bc_private.a.agno == be32_to_cpu(agf->agf_seqno)); |
| 249 | ASSERT(agf->agf_roots[cur->bc_btnum] != 0); |
| 250 | |
| 251 | ptr->s = agf->agf_roots[cur->bc_btnum]; |
| 252 | } |
| 253 | |
| 254 | STATIC __int64_t |
| 255 | xfs_allocbt_key_diff( |
| 256 | struct xfs_btree_cur *cur, |
| 257 | union xfs_btree_key *key) |
| 258 | { |
| 259 | xfs_alloc_rec_incore_t *rec = &cur->bc_rec.a; |
| 260 | xfs_alloc_key_t *kp = &key->alloc; |
| 261 | __int64_t diff; |
| 262 | |
| 263 | if (cur->bc_btnum == XFS_BTNUM_BNO) { |
| 264 | return (__int64_t)be32_to_cpu(kp->ar_startblock) - |
| 265 | rec->ar_startblock; |
| 266 | } |
| 267 | |
| 268 | diff = (__int64_t)be32_to_cpu(kp->ar_blockcount) - rec->ar_blockcount; |
| 269 | if (diff) |
| 270 | return diff; |
| 271 | |
| 272 | return (__int64_t)be32_to_cpu(kp->ar_startblock) - rec->ar_startblock; |
| 273 | } |
| 274 | |
Christoph Hellwig | 4a26e66 | 2008-10-30 16:58:32 +1100 | [diff] [blame] | 275 | #ifdef DEBUG |
| 276 | STATIC int |
| 277 | xfs_allocbt_keys_inorder( |
| 278 | struct xfs_btree_cur *cur, |
| 279 | union xfs_btree_key *k1, |
| 280 | union xfs_btree_key *k2) |
| 281 | { |
| 282 | if (cur->bc_btnum == XFS_BTNUM_BNO) { |
| 283 | return be32_to_cpu(k1->alloc.ar_startblock) < |
| 284 | be32_to_cpu(k2->alloc.ar_startblock); |
| 285 | } else { |
| 286 | return be32_to_cpu(k1->alloc.ar_blockcount) < |
| 287 | be32_to_cpu(k2->alloc.ar_blockcount) || |
| 288 | (k1->alloc.ar_blockcount == k2->alloc.ar_blockcount && |
| 289 | be32_to_cpu(k1->alloc.ar_startblock) < |
| 290 | be32_to_cpu(k2->alloc.ar_startblock)); |
| 291 | } |
| 292 | } |
| 293 | |
| 294 | STATIC int |
| 295 | xfs_allocbt_recs_inorder( |
| 296 | struct xfs_btree_cur *cur, |
| 297 | union xfs_btree_rec *r1, |
| 298 | union xfs_btree_rec *r2) |
| 299 | { |
| 300 | if (cur->bc_btnum == XFS_BTNUM_BNO) { |
| 301 | return be32_to_cpu(r1->alloc.ar_startblock) + |
| 302 | be32_to_cpu(r1->alloc.ar_blockcount) <= |
| 303 | be32_to_cpu(r2->alloc.ar_startblock); |
| 304 | } else { |
| 305 | return be32_to_cpu(r1->alloc.ar_blockcount) < |
| 306 | be32_to_cpu(r2->alloc.ar_blockcount) || |
| 307 | (r1->alloc.ar_blockcount == r2->alloc.ar_blockcount && |
| 308 | be32_to_cpu(r1->alloc.ar_startblock) < |
| 309 | be32_to_cpu(r2->alloc.ar_startblock)); |
| 310 | } |
| 311 | } |
| 312 | #endif /* DEBUG */ |
| 313 | |
Christoph Hellwig | 561f7d1 | 2008-10-30 16:53:59 +1100 | [diff] [blame] | 314 | static const struct xfs_btree_ops xfs_allocbt_ops = { |
Christoph Hellwig | 65f1eae | 2008-10-30 16:55:34 +1100 | [diff] [blame] | 315 | .rec_len = sizeof(xfs_alloc_rec_t), |
| 316 | .key_len = sizeof(xfs_alloc_key_t), |
| 317 | |
Christoph Hellwig | 561f7d1 | 2008-10-30 16:53:59 +1100 | [diff] [blame] | 318 | .dup_cursor = xfs_allocbt_dup_cursor, |
Christoph Hellwig | 344207c | 2008-10-30 16:57:16 +1100 | [diff] [blame] | 319 | .set_root = xfs_allocbt_set_root, |
Christoph Hellwig | f5eb8e7 | 2008-10-30 16:57:03 +1100 | [diff] [blame] | 320 | .alloc_block = xfs_allocbt_alloc_block, |
Christoph Hellwig | d4b3a4b | 2008-10-30 16:57:51 +1100 | [diff] [blame] | 321 | .free_block = xfs_allocbt_free_block, |
Christoph Hellwig | 278d0ca | 2008-10-30 16:56:32 +1100 | [diff] [blame] | 322 | .update_lastrec = xfs_allocbt_update_lastrec, |
Christoph Hellwig | 91cca5df | 2008-10-30 16:58:01 +1100 | [diff] [blame] | 323 | .get_minrecs = xfs_allocbt_get_minrecs, |
Christoph Hellwig | ce5e42d | 2008-10-30 16:55:23 +1100 | [diff] [blame] | 324 | .get_maxrecs = xfs_allocbt_get_maxrecs, |
Christoph Hellwig | fe033cc | 2008-10-30 16:56:09 +1100 | [diff] [blame] | 325 | .init_key_from_rec = xfs_allocbt_init_key_from_rec, |
Christoph Hellwig | 4b22a57 | 2008-10-30 16:57:40 +1100 | [diff] [blame] | 326 | .init_rec_from_key = xfs_allocbt_init_rec_from_key, |
| 327 | .init_rec_from_cur = xfs_allocbt_init_rec_from_cur, |
Christoph Hellwig | fe033cc | 2008-10-30 16:56:09 +1100 | [diff] [blame] | 328 | .init_ptr_from_cur = xfs_allocbt_init_ptr_from_cur, |
| 329 | .key_diff = xfs_allocbt_key_diff, |
Christoph Hellwig | 4a26e66 | 2008-10-30 16:58:32 +1100 | [diff] [blame] | 330 | #ifdef DEBUG |
| 331 | .keys_inorder = xfs_allocbt_keys_inorder, |
| 332 | .recs_inorder = xfs_allocbt_recs_inorder, |
| 333 | #endif |
Christoph Hellwig | 561f7d1 | 2008-10-30 16:53:59 +1100 | [diff] [blame] | 334 | }; |
| 335 | |
| 336 | /* |
| 337 | * Allocate a new allocation btree cursor. |
| 338 | */ |
| 339 | struct xfs_btree_cur * /* new alloc btree cursor */ |
| 340 | xfs_allocbt_init_cursor( |
| 341 | struct xfs_mount *mp, /* file system mount point */ |
| 342 | struct xfs_trans *tp, /* transaction pointer */ |
| 343 | struct xfs_buf *agbp, /* buffer for agf structure */ |
| 344 | xfs_agnumber_t agno, /* allocation group number */ |
| 345 | xfs_btnum_t btnum) /* btree identifier */ |
| 346 | { |
| 347 | struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp); |
| 348 | struct xfs_btree_cur *cur; |
| 349 | |
| 350 | ASSERT(btnum == XFS_BTNUM_BNO || btnum == XFS_BTNUM_CNT); |
| 351 | |
| 352 | cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP); |
| 353 | |
| 354 | cur->bc_tp = tp; |
| 355 | cur->bc_mp = mp; |
Christoph Hellwig | 561f7d1 | 2008-10-30 16:53:59 +1100 | [diff] [blame] | 356 | cur->bc_btnum = btnum; |
| 357 | cur->bc_blocklog = mp->m_sb.sb_blocklog; |
Christoph Hellwig | 561f7d1 | 2008-10-30 16:53:59 +1100 | [diff] [blame] | 358 | cur->bc_ops = &xfs_allocbt_ops; |
Christoph Hellwig | dec58f1 | 2011-07-08 14:34:18 +0200 | [diff] [blame] | 359 | |
| 360 | if (btnum == XFS_BTNUM_CNT) { |
| 361 | cur->bc_nlevels = be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNT]); |
Christoph Hellwig | 278d0ca | 2008-10-30 16:56:32 +1100 | [diff] [blame] | 362 | cur->bc_flags = XFS_BTREE_LASTREC_UPDATE; |
Christoph Hellwig | dec58f1 | 2011-07-08 14:34:18 +0200 | [diff] [blame] | 363 | } else { |
| 364 | cur->bc_nlevels = be32_to_cpu(agf->agf_levels[XFS_BTNUM_BNO]); |
| 365 | } |
Christoph Hellwig | 561f7d1 | 2008-10-30 16:53:59 +1100 | [diff] [blame] | 366 | |
| 367 | cur->bc_private.a.agbp = agbp; |
| 368 | cur->bc_private.a.agno = agno; |
| 369 | |
| 370 | return cur; |
| 371 | } |
Christoph Hellwig | 60197e8 | 2008-10-30 17:11:19 +1100 | [diff] [blame] | 372 | |
| 373 | /* |
| 374 | * Calculate number of records in an alloc btree block. |
| 375 | */ |
| 376 | int |
| 377 | xfs_allocbt_maxrecs( |
| 378 | struct xfs_mount *mp, |
| 379 | int blocklen, |
| 380 | int leaf) |
| 381 | { |
Christoph Hellwig | 7cc95a8 | 2008-10-30 17:14:34 +1100 | [diff] [blame] | 382 | blocklen -= XFS_ALLOC_BLOCK_LEN(mp); |
Christoph Hellwig | 60197e8 | 2008-10-30 17:11:19 +1100 | [diff] [blame] | 383 | |
| 384 | if (leaf) |
| 385 | return blocklen / sizeof(xfs_alloc_rec_t); |
| 386 | return blocklen / (sizeof(xfs_alloc_key_t) + sizeof(xfs_alloc_ptr_t)); |
| 387 | } |