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