fs/xfs/xfs_alloc_btree.c

   1 /*
   2  * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   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
   7  * published by the Free Software Foundation.
   8  *
   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.
  13  *
  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
  17  */
  18 #include "xfs.h"
  19 #include "xfs_fs.h"
  20 #include "xfs_types.h"
  21 #include "xfs_log.h"
  22 #include "xfs_trans.h"
  23 #include "xfs_sb.h"
  24 #include "xfs_ag.h"
  25 #include "xfs_mount.h"
  26 #include "xfs_bmap_btree.h"
  27 #include "xfs_alloc_btree.h"
  28 #include "xfs_ialloc_btree.h"
  29 #include "xfs_dinode.h"
  30 #include "xfs_inode.h"
  31 #include "xfs_btree.h"
  32 #include "xfs_alloc.h"
  33 #include "xfs_extent_busy.h"
  34 #include "xfs_error.h"
  35 #include "xfs_trace.h"
  36
  37
  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
  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;
  57         struct xfs_perag        *pag = xfs_perag_get(cur->bc_mp, seqno);
  58
  59         ASSERT(ptr->s != 0);
  60
  61         agf->agf_roots[btnum] = ptr->s;
  62         be32_add_cpu(&agf->agf_levels[btnum], inc);
  63         pag->pagf_levels[btnum] += inc;
  64         xfs_perag_put(pag);
  65
  66         xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_ROOTS | XFS_AGF_LEVELS);
  67 }
  68
  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         }
  95
  96         xfs_extent_busy_reuse(cur->bc_mp, cur->bc_private.a.agno, bno, 1, false);
  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
 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
 116         bno = xfs_daddr_to_agbno(cur->bc_mp, XFS_BUF_ADDR(bp));
 117         error = xfs_alloc_put_freelist(cur->bc_tp, agbp, NULL, bno, 1);
 118         if (error)
 119                 return error;
 120
 121         xfs_extent_busy_insert(cur->bc_tp, be32_to_cpu(agf->agf_seqno), bno, 1,
 122                               XFS_EXTENT_BUSY_SKIP_DISCARD);
 123         xfs_trans_agbtree_delta(cur->bc_tp, -1);
 124         return 0;
 125 }
 126
 127 /*
 128  * Update the longest extent in the AGF
 129  */
 130 STATIC void
 131 xfs_allocbt_update_lastrec(
 132         struct xfs_btree_cur    *cur,
 133         struct xfs_btree_block  *block,
 134         union xfs_btree_rec     *rec,
 135         int                     ptr,
 136         int                     reason)
 137 {
 138         struct xfs_agf          *agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);
 139         xfs_agnumber_t          seqno = be32_to_cpu(agf->agf_seqno);
 140         struct xfs_perag        *pag;
 141         __be32                  len;
 142         int                     numrecs;
 143
 144         ASSERT(cur->bc_btnum == XFS_BTNUM_CNT);
 145
 146         switch (reason) {
 147         case LASTREC_UPDATE:
 148                 /*
 149                  * If this is the last leaf block and it's the last record,
 150                  * then update the size of the longest extent in the AG.
 151                  */
 152                 if (ptr != xfs_btree_get_numrecs(block))
 153                         return;
 154                 len = rec->alloc.ar_blockcount;
 155                 break;
 156         case LASTREC_INSREC:
 157                 if (be32_to_cpu(rec->alloc.ar_blockcount) <=
 158                     be32_to_cpu(agf->agf_longest))
 159                         return;
 160                 len = rec->alloc.ar_blockcount;
 161                 break;
 162         case LASTREC_DELREC:
 163                 numrecs = xfs_btree_get_numrecs(block);
 164                 if (ptr <= numrecs)
 165                         return;
 166                 ASSERT(ptr == numrecs + 1);
 167
 168                 if (numrecs) {
 169                         xfs_alloc_rec_t *rrp;
 170
 171                         rrp = XFS_ALLOC_REC_ADDR(cur->bc_mp, block, numrecs);
 172                         len = rrp->ar_blockcount;
 173                 } else {
 174                         len = 0;
 175                 }
 176
 177                 break;
 178         default:
 179                 ASSERT(0);
 180                 return;
 181         }
 182
 183         agf->agf_longest = len;
 184         pag = xfs_perag_get(cur->bc_mp, seqno);
 185         pag->pagf_longest = be32_to_cpu(len);
 186         xfs_perag_put(pag);
 187         xfs_alloc_log_agf(cur->bc_tp, cur->bc_private.a.agbp, XFS_AGF_LONGEST);
 188 }
 189
 190 STATIC int
 191 xfs_allocbt_get_minrecs(
 192         struct xfs_btree_cur    *cur,
 193         int                     level)
 194 {
 195         return cur->bc_mp->m_alloc_mnr[level != 0];
 196 }
 197
 198 STATIC int
 199 xfs_allocbt_get_maxrecs(
 200         struct xfs_btree_cur    *cur,
 201         int                     level)
 202 {
 203         return cur->bc_mp->m_alloc_mxr[level != 0];
 204 }
 205
 206 STATIC void
 207 xfs_allocbt_init_key_from_rec(
 208         union xfs_btree_key     *key,
 209         union xfs_btree_rec     *rec)
 210 {
 211         ASSERT(rec->alloc.ar_startblock != 0);
 212
 213         key->alloc.ar_startblock = rec->alloc.ar_startblock;
 214         key->alloc.ar_blockcount = rec->alloc.ar_blockcount;
 215 }
 216
 217 STATIC void
 218 xfs_allocbt_init_rec_from_key(
 219         union xfs_btree_key     *key,
 220         union xfs_btree_rec     *rec)
 221 {
 222         ASSERT(key->alloc.ar_startblock != 0);
 223
 224         rec->alloc.ar_startblock = key->alloc.ar_startblock;
 225         rec->alloc.ar_blockcount = key->alloc.ar_blockcount;
 226 }
 227
 228 STATIC void
 229 xfs_allocbt_init_rec_from_cur(
 230         struct xfs_btree_cur    *cur,
 231         union xfs_btree_rec     *rec)
 232 {
 233         ASSERT(cur->bc_rec.a.ar_startblock != 0);
 234
 235         rec->alloc.ar_startblock = cpu_to_be32(cur->bc_rec.a.ar_startblock);
 236         rec->alloc.ar_blockcount = cpu_to_be32(cur->bc_rec.a.ar_blockcount);
 237 }
 238
 239 STATIC void
 240 xfs_allocbt_init_ptr_from_cur(
 241         struct xfs_btree_cur    *cur,
 242         union xfs_btree_ptr     *ptr)
 243 {
 244         struct xfs_agf          *agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);
 245
 246         ASSERT(cur->bc_private.a.agno == be32_to_cpu(agf->agf_seqno));
 247         ASSERT(agf->agf_roots[cur->bc_btnum] != 0);
 248
 249         ptr->s = agf->agf_roots[cur->bc_btnum];
 250 }
 251
 252 STATIC __int64_t
 253 xfs_allocbt_key_diff(
 254         struct xfs_btree_cur    *cur,
 255         union xfs_btree_key     *key)
 256 {
 257         xfs_alloc_rec_incore_t  *rec = &cur->bc_rec.a;
 258         xfs_alloc_key_t         *kp = &key->alloc;
 259         __int64_t               diff;
 260
 261         if (cur->bc_btnum == XFS_BTNUM_BNO) {
 262                 return (__int64_t)be32_to_cpu(kp->ar_startblock) -
 263                                 rec->ar_startblock;
 264         }
 265
 266         diff = (__int64_t)be32_to_cpu(kp->ar_blockcount) - rec->ar_blockcount;
 267         if (diff)
 268                 return diff;
 269
 270         return (__int64_t)be32_to_cpu(kp->ar_startblock) - rec->ar_startblock;
 271 }
 272
 273 #ifdef DEBUG
 274 STATIC int
 275 xfs_allocbt_keys_inorder(
 276         struct xfs_btree_cur    *cur,
 277         union xfs_btree_key     *k1,
 278         union xfs_btree_key     *k2)
 279 {
 280         if (cur->bc_btnum == XFS_BTNUM_BNO) {
 281                 return be32_to_cpu(k1->alloc.ar_startblock) <
 282                        be32_to_cpu(k2->alloc.ar_startblock);
 283         } else {
 284                 return be32_to_cpu(k1->alloc.ar_blockcount) <
 285                         be32_to_cpu(k2->alloc.ar_blockcount) ||
 286                         (k1->alloc.ar_blockcount == k2->alloc.ar_blockcount &&
 287                          be32_to_cpu(k1->alloc.ar_startblock) <
 288                          be32_to_cpu(k2->alloc.ar_startblock));
 289         }
 290 }
 291
 292 STATIC int
 293 xfs_allocbt_recs_inorder(
 294         struct xfs_btree_cur    *cur,
 295         union xfs_btree_rec     *r1,
 296         union xfs_btree_rec     *r2)
 297 {
 298         if (cur->bc_btnum == XFS_BTNUM_BNO) {
 299                 return be32_to_cpu(r1->alloc.ar_startblock) +
 300                         be32_to_cpu(r1->alloc.ar_blockcount) <=
 301                         be32_to_cpu(r2->alloc.ar_startblock);
 302         } else {
 303                 return be32_to_cpu(r1->alloc.ar_blockcount) <
 304                         be32_to_cpu(r2->alloc.ar_blockcount) ||
 305                         (r1->alloc.ar_blockcount == r2->alloc.ar_blockcount &&
 306                          be32_to_cpu(r1->alloc.ar_startblock) <
 307                          be32_to_cpu(r2->alloc.ar_startblock));
 308         }
 309 }
 310 #endif  /* DEBUG */
 311
 312 static const struct xfs_btree_ops xfs_allocbt_ops = {
 313         .rec_len                = sizeof(xfs_alloc_rec_t),
 314         .key_len                = sizeof(xfs_alloc_key_t),
 315
 316         .dup_cursor             = xfs_allocbt_dup_cursor,
 317         .set_root               = xfs_allocbt_set_root,
 318         .alloc_block            = xfs_allocbt_alloc_block,
 319         .free_block             = xfs_allocbt_free_block,
 320         .update_lastrec         = xfs_allocbt_update_lastrec,
 321         .get_minrecs            = xfs_allocbt_get_minrecs,
 322         .get_maxrecs            = xfs_allocbt_get_maxrecs,
 323         .init_key_from_rec      = xfs_allocbt_init_key_from_rec,
 324         .init_rec_from_key      = xfs_allocbt_init_rec_from_key,
 325         .init_rec_from_cur      = xfs_allocbt_init_rec_from_cur,
 326         .init_ptr_from_cur      = xfs_allocbt_init_ptr_from_cur,
 327         .key_diff               = xfs_allocbt_key_diff,
 328 #ifdef DEBUG
 329         .keys_inorder           = xfs_allocbt_keys_inorder,
 330         .recs_inorder           = xfs_allocbt_recs_inorder,
 331 #endif
 332 };
 333
 334 /*
 335  * Allocate a new allocation btree cursor.
 336  */
 337 struct xfs_btree_cur *                  /* new alloc btree cursor */
 338 xfs_allocbt_init_cursor(
 339         struct xfs_mount        *mp,            /* file system mount point */
 340         struct xfs_trans        *tp,            /* transaction pointer */
 341         struct xfs_buf          *agbp,          /* buffer for agf structure */
 342         xfs_agnumber_t          agno,           /* allocation group number */
 343         xfs_btnum_t             btnum)          /* btree identifier */
 344 {
 345         struct xfs_agf          *agf = XFS_BUF_TO_AGF(agbp);
 346         struct xfs_btree_cur    *cur;
 347
 348         ASSERT(btnum == XFS_BTNUM_BNO || btnum == XFS_BTNUM_CNT);
 349
 350         cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP);
 351
 352         cur->bc_tp = tp;
 353         cur->bc_mp = mp;
 354         cur->bc_btnum = btnum;
 355         cur->bc_blocklog = mp->m_sb.sb_blocklog;
 356         cur->bc_ops = &xfs_allocbt_ops;
 357
 358         if (btnum == XFS_BTNUM_CNT) {
 359                 cur->bc_nlevels = be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNT]);
 360                 cur->bc_flags = XFS_BTREE_LASTREC_UPDATE;
 361         } else {
 362                 cur->bc_nlevels = be32_to_cpu(agf->agf_levels[XFS_BTNUM_BNO]);
 363         }
 364
 365         cur->bc_private.a.agbp = agbp;
 366         cur->bc_private.a.agno = agno;
 367
 368         return cur;
 369 }
 370
 371 /*
 372  * Calculate number of records in an alloc btree block.
 373  */
 374 int
 375 xfs_allocbt_maxrecs(
 376         struct xfs_mount        *mp,
 377         int                     blocklen,
 378         int                     leaf)
 379 {
 380         blocklen -= XFS_ALLOC_BLOCK_LEN(mp);
 381
 382         if (leaf)
 383                 return blocklen / sizeof(xfs_alloc_rec_t);
 384         return blocklen / (sizeof(xfs_alloc_key_t) + sizeof(xfs_alloc_ptr_t));
 385 }