release/src-rt-6.x.4708/linux/linux-2.6.36/fs/xfs/xfs_ialloc_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_btree_trace.h"
  35 #include "xfs_ialloc.h"
  36 #include "xfs_alloc.h"
  37 #include "xfs_error.h"
  38
  39
  40 STATIC int
  41 xfs_inobt_get_minrecs(
  42         struct xfs_btree_cur    *cur,
  43         int                     level)
  44 {
  45         return cur->bc_mp->m_inobt_mnr[level != 0];
  46 }
  47
  48 STATIC struct xfs_btree_cur *
  49 xfs_inobt_dup_cursor(
  50         struct xfs_btree_cur    *cur)
  51 {
  52         return xfs_inobt_init_cursor(cur->bc_mp, cur->bc_tp,
  53                         cur->bc_private.a.agbp, cur->bc_private.a.agno);
  54 }
  55
  56 STATIC void
  57 xfs_inobt_set_root(
  58         struct xfs_btree_cur    *cur,
  59         union xfs_btree_ptr     *nptr,
  60         int                     inc)    /* level change */
  61 {
  62         struct xfs_buf          *agbp = cur->bc_private.a.agbp;
  63         struct xfs_agi          *agi = XFS_BUF_TO_AGI(agbp);
  64
  65         agi->agi_root = nptr->s;
  66         be32_add_cpu(&agi->agi_level, inc);
  67         xfs_ialloc_log_agi(cur->bc_tp, agbp, XFS_AGI_ROOT | XFS_AGI_LEVEL);
  68 }
  69
  70 STATIC int
  71 xfs_inobt_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         xfs_alloc_arg_t         args;           /* block allocation args */
  79         int                     error;          /* error return value */
  80         xfs_agblock_t           sbno = be32_to_cpu(start->s);
  81
  82         XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
  83
  84         memset(&args, 0, sizeof(args));
  85         args.tp = cur->bc_tp;
  86         args.mp = cur->bc_mp;
  87         args.fsbno = XFS_AGB_TO_FSB(args.mp, cur->bc_private.a.agno, sbno);
  88         args.minlen = 1;
  89         args.maxlen = 1;
  90         args.prod = 1;
  91         args.type = XFS_ALLOCTYPE_NEAR_BNO;
  92
  93         error = xfs_alloc_vextent(&args);
  94         if (error) {
  95                 XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
  96                 return error;
  97         }
  98         if (args.fsbno == NULLFSBLOCK) {
  99                 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
 100                 *stat = 0;
 101                 return 0;
 102         }
 103         ASSERT(args.len == 1);
 104         XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
 105
 106         new->s = cpu_to_be32(XFS_FSB_TO_AGBNO(args.mp, args.fsbno));
 107         *stat = 1;
 108         return 0;
 109 }
 110
 111 STATIC int
 112 xfs_inobt_free_block(
 113         struct xfs_btree_cur    *cur,
 114         struct xfs_buf          *bp)
 115 {
 116         xfs_fsblock_t           fsbno;
 117         int                     error;
 118
 119         fsbno = XFS_DADDR_TO_FSB(cur->bc_mp, XFS_BUF_ADDR(bp));
 120         error = xfs_free_extent(cur->bc_tp, fsbno, 1);
 121         if (error)
 122                 return error;
 123
 124         xfs_trans_binval(cur->bc_tp, bp);
 125         return error;
 126 }
 127
 128 STATIC int
 129 xfs_inobt_get_maxrecs(
 130         struct xfs_btree_cur    *cur,
 131         int                     level)
 132 {
 133         return cur->bc_mp->m_inobt_mxr[level != 0];
 134 }
 135
 136 STATIC void
 137 xfs_inobt_init_key_from_rec(
 138         union xfs_btree_key     *key,
 139         union xfs_btree_rec     *rec)
 140 {
 141         key->inobt.ir_startino = rec->inobt.ir_startino;
 142 }
 143
 144 STATIC void
 145 xfs_inobt_init_rec_from_key(
 146         union xfs_btree_key     *key,
 147         union xfs_btree_rec     *rec)
 148 {
 149         rec->inobt.ir_startino = key->inobt.ir_startino;
 150 }
 151
 152 STATIC void
 153 xfs_inobt_init_rec_from_cur(
 154         struct xfs_btree_cur    *cur,
 155         union xfs_btree_rec     *rec)
 156 {
 157         rec->inobt.ir_startino = cpu_to_be32(cur->bc_rec.i.ir_startino);
 158         rec->inobt.ir_freecount = cpu_to_be32(cur->bc_rec.i.ir_freecount);
 159         rec->inobt.ir_free = cpu_to_be64(cur->bc_rec.i.ir_free);
 160 }
 161
 162 /*
 163  * initial value of ptr for lookup
 164  */
 165 STATIC void
 166 xfs_inobt_init_ptr_from_cur(
 167         struct xfs_btree_cur    *cur,
 168         union xfs_btree_ptr     *ptr)
 169 {
 170         struct xfs_agi          *agi = XFS_BUF_TO_AGI(cur->bc_private.a.agbp);
 171
 172         ASSERT(cur->bc_private.a.agno == be32_to_cpu(agi->agi_seqno));
 173
 174         ptr->s = agi->agi_root;
 175 }
 176
 177 STATIC __int64_t
 178 xfs_inobt_key_diff(
 179         struct xfs_btree_cur    *cur,
 180         union xfs_btree_key     *key)
 181 {
 182         return (__int64_t)be32_to_cpu(key->inobt.ir_startino) -
 183                           cur->bc_rec.i.ir_startino;
 184 }
 185
 186 STATIC int
 187 xfs_inobt_kill_root(
 188         struct xfs_btree_cur    *cur,
 189         struct xfs_buf          *bp,
 190         int                     level,
 191         union xfs_btree_ptr     *newroot)
 192 {
 193         int                     error;
 194
 195         XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
 196         XFS_BTREE_STATS_INC(cur, killroot);
 197
 198         /*
 199          * Update the root pointer, decreasing the level by 1 and then
 200          * free the old root.
 201          */
 202         xfs_inobt_set_root(cur, newroot, -1);
 203         error = xfs_inobt_free_block(cur, bp);
 204         if (error) {
 205                 XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
 206                 return error;
 207         }
 208
 209         XFS_BTREE_STATS_INC(cur, free);
 210
 211         cur->bc_bufs[level] = NULL;
 212         cur->bc_nlevels--;
 213
 214         XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
 215         return 0;
 216 }
 217
 218 #ifdef DEBUG
 219 STATIC int
 220 xfs_inobt_keys_inorder(
 221         struct xfs_btree_cur    *cur,
 222         union xfs_btree_key     *k1,
 223         union xfs_btree_key     *k2)
 224 {
 225         return be32_to_cpu(k1->inobt.ir_startino) <
 226                 be32_to_cpu(k2->inobt.ir_startino);
 227 }
 228
 229 STATIC int
 230 xfs_inobt_recs_inorder(
 231         struct xfs_btree_cur    *cur,
 232         union xfs_btree_rec     *r1,
 233         union xfs_btree_rec     *r2)
 234 {
 235         return be32_to_cpu(r1->inobt.ir_startino) + XFS_INODES_PER_CHUNK <=
 236                 be32_to_cpu(r2->inobt.ir_startino);
 237 }
 238 #endif  /* DEBUG */
 239
 240 #ifdef XFS_BTREE_TRACE
 241 ktrace_t        *xfs_inobt_trace_buf;
 242
 243 STATIC void
 244 xfs_inobt_trace_enter(
 245         struct xfs_btree_cur    *cur,
 246         const char              *func,
 247         char                    *s,
 248         int                     type,
 249         int                     line,
 250         __psunsigned_t          a0,
 251         __psunsigned_t          a1,
 252         __psunsigned_t          a2,
 253         __psunsigned_t          a3,
 254         __psunsigned_t          a4,
 255         __psunsigned_t          a5,
 256         __psunsigned_t          a6,
 257         __psunsigned_t          a7,
 258         __psunsigned_t          a8,
 259         __psunsigned_t          a9,
 260         __psunsigned_t          a10)
 261 {
 262         ktrace_enter(xfs_inobt_trace_buf, (void *)(__psint_t)type,
 263                 (void *)func, (void *)s, NULL, (void *)cur,
 264                 (void *)a0, (void *)a1, (void *)a2, (void *)a3,
 265                 (void *)a4, (void *)a5, (void *)a6, (void *)a7,
 266                 (void *)a8, (void *)a9, (void *)a10);
 267 }
 268
 269 STATIC void
 270 xfs_inobt_trace_cursor(
 271         struct xfs_btree_cur    *cur,
 272         __uint32_t              *s0,
 273         __uint64_t              *l0,
 274         __uint64_t              *l1)
 275 {
 276         *s0 = cur->bc_private.a.agno;
 277         *l0 = cur->bc_rec.i.ir_startino;
 278         *l1 = cur->bc_rec.i.ir_free;
 279 }
 280
 281 STATIC void
 282 xfs_inobt_trace_key(
 283         struct xfs_btree_cur    *cur,
 284         union xfs_btree_key     *key,
 285         __uint64_t              *l0,
 286         __uint64_t              *l1)
 287 {
 288         *l0 = be32_to_cpu(key->inobt.ir_startino);
 289         *l1 = 0;
 290 }
 291
 292 STATIC void
 293 xfs_inobt_trace_record(
 294         struct xfs_btree_cur    *cur,
 295         union xfs_btree_rec     *rec,
 296         __uint64_t              *l0,
 297         __uint64_t              *l1,
 298         __uint64_t              *l2)
 299 {
 300         *l0 = be32_to_cpu(rec->inobt.ir_startino);
 301         *l1 = be32_to_cpu(rec->inobt.ir_freecount);
 302         *l2 = be64_to_cpu(rec->inobt.ir_free);
 303 }
 304 #endif /* XFS_BTREE_TRACE */
 305
 306 static const struct xfs_btree_ops xfs_inobt_ops = {
 307         .rec_len                = sizeof(xfs_inobt_rec_t),
 308         .key_len                = sizeof(xfs_inobt_key_t),
 309
 310         .dup_cursor             = xfs_inobt_dup_cursor,
 311         .set_root               = xfs_inobt_set_root,
 312         .kill_root              = xfs_inobt_kill_root,
 313         .alloc_block            = xfs_inobt_alloc_block,
 314         .free_block             = xfs_inobt_free_block,
 315         .get_minrecs            = xfs_inobt_get_minrecs,
 316         .get_maxrecs            = xfs_inobt_get_maxrecs,
 317         .init_key_from_rec      = xfs_inobt_init_key_from_rec,
 318         .init_rec_from_key      = xfs_inobt_init_rec_from_key,
 319         .init_rec_from_cur      = xfs_inobt_init_rec_from_cur,
 320         .init_ptr_from_cur      = xfs_inobt_init_ptr_from_cur,
 321         .key_diff               = xfs_inobt_key_diff,
 322
 323 #ifdef DEBUG
 324         .keys_inorder           = xfs_inobt_keys_inorder,
 325         .recs_inorder           = xfs_inobt_recs_inorder,
 326 #endif
 327
 328 #ifdef XFS_BTREE_TRACE
 329         .trace_enter            = xfs_inobt_trace_enter,
 330         .trace_cursor           = xfs_inobt_trace_cursor,
 331         .trace_key              = xfs_inobt_trace_key,
 332         .trace_record           = xfs_inobt_trace_record,
 333 #endif
 334 };
 335
 336 /*
 337  * Allocate a new inode btree cursor.
 338  */
 339 struct xfs_btree_cur *                          /* new inode btree cursor */
 340 xfs_inobt_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 agi structure */
 344         xfs_agnumber_t          agno)           /* allocation group number */
 345 {
 346         struct xfs_agi          *agi = XFS_BUF_TO_AGI(agbp);
 347         struct xfs_btree_cur    *cur;
 348
 349         cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP);
 350
 351         cur->bc_tp = tp;
 352         cur->bc_mp = mp;
 353         cur->bc_nlevels = be32_to_cpu(agi->agi_level);
 354         cur->bc_btnum = XFS_BTNUM_INO;
 355         cur->bc_blocklog = mp->m_sb.sb_blocklog;
 356
 357         cur->bc_ops = &xfs_inobt_ops;
 358
 359         cur->bc_private.a.agbp = agbp;
 360         cur->bc_private.a.agno = agno;
 361
 362         return cur;
 363 }
 364
 365 /*
 366  * Calculate number of records in an inobt btree block.
 367  */
 368 int
 369 xfs_inobt_maxrecs(
 370         struct xfs_mount        *mp,
 371         int                     blocklen,
 372         int                     leaf)
 373 {
 374         blocklen -= XFS_INOBT_BLOCK_LEN(mp);
 375
 376         if (leaf)
 377                 return blocklen / sizeof(xfs_inobt_rec_t);
 378         return blocklen / (sizeof(xfs_inobt_key_t) + sizeof(xfs_inobt_ptr_t));
 379 }