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_trans.h"
  24 #include "xfs_sb.h"
  25 #include "xfs_ag.h"
  26 #include "xfs_mount.h"
  27 #include "xfs_bmap_btree.h"
  28 #include "xfs_alloc_btree.h"
  29 #include "xfs_ialloc_btree.h"
  30 #include "xfs_dinode.h"
  31 #include "xfs_inode.h"
  32 #include "xfs_btree.h"
  33 #include "xfs_ialloc.h"
  34 #include "xfs_alloc.h"
  35 #include "xfs_error.h"
  36 #include "xfs_trace.h"
  37
  38
  39 STATIC int
  40 xfs_inobt_get_minrecs(
  41         struct xfs_btree_cur    *cur,
  42         int                     level)
  43 {
  44         return cur->bc_mp->m_inobt_mnr[level != 0];
  45 }
  46
  47 STATIC struct xfs_btree_cur *
  48 xfs_inobt_dup_cursor(
  49         struct xfs_btree_cur    *cur)
  50 {
  51         return xfs_inobt_init_cursor(cur->bc_mp, cur->bc_tp,
  52                         cur->bc_private.a.agbp, cur->bc_private.a.agno);
  53 }
  54
  55 STATIC void
  56 xfs_inobt_set_root(
  57         struct xfs_btree_cur    *cur,
  58         union xfs_btree_ptr     *nptr,
  59         int                     inc)    /* level change */
  60 {
  61         struct xfs_buf          *agbp = cur->bc_private.a.agbp;
  62         struct xfs_agi          *agi = XFS_BUF_TO_AGI(agbp);
  63
  64         agi->agi_root = nptr->s;
  65         be32_add_cpu(&agi->agi_level, inc);
  66         xfs_ialloc_log_agi(cur->bc_tp, agbp, XFS_AGI_ROOT | XFS_AGI_LEVEL);
  67 }
  68
  69 STATIC int
  70 xfs_inobt_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         xfs_alloc_arg_t         args;           /* block allocation args */
  78         int                     error;          /* error return value */
  79         xfs_agblock_t           sbno = be32_to_cpu(start->s);
  80
  81         XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
  82
  83         memset(&args, 0, sizeof(args));
  84         args.tp = cur->bc_tp;
  85         args.mp = cur->bc_mp;
  86         args.fsbno = XFS_AGB_TO_FSB(args.mp, cur->bc_private.a.agno, sbno);
  87         args.minlen = 1;
  88         args.maxlen = 1;
  89         args.prod = 1;
  90         args.type = XFS_ALLOCTYPE_NEAR_BNO;
  91
  92         error = xfs_alloc_vextent(&args);
  93         if (error) {
  94                 XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
  95                 return error;
  96         }
  97         if (args.fsbno == NULLFSBLOCK) {
  98                 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
  99                 *stat = 0;
 100                 return 0;
 101         }
 102         ASSERT(args.len == 1);
 103         XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
 104
 105         new->s = cpu_to_be32(XFS_FSB_TO_AGBNO(args.mp, args.fsbno));
 106         *stat = 1;
 107         return 0;
 108 }
 109
 110 STATIC int
 111 xfs_inobt_free_block(
 112         struct xfs_btree_cur    *cur,
 113         struct xfs_buf          *bp)
 114 {
 115         xfs_fsblock_t           fsbno;
 116         int                     error;
 117
 118         fsbno = XFS_DADDR_TO_FSB(cur->bc_mp, XFS_BUF_ADDR(bp));
 119         error = xfs_free_extent(cur->bc_tp, fsbno, 1);
 120         if (error)
 121                 return error;
 122
 123         xfs_trans_binval(cur->bc_tp, bp);
 124         return error;
 125 }
 126
 127 STATIC int
 128 xfs_inobt_get_maxrecs(
 129         struct xfs_btree_cur    *cur,
 130         int                     level)
 131 {
 132         return cur->bc_mp->m_inobt_mxr[level != 0];
 133 }
 134
 135 STATIC void
 136 xfs_inobt_init_key_from_rec(
 137         union xfs_btree_key     *key,
 138         union xfs_btree_rec     *rec)
 139 {
 140         key->inobt.ir_startino = rec->inobt.ir_startino;
 141 }
 142
 143 STATIC void
 144 xfs_inobt_init_rec_from_key(
 145         union xfs_btree_key     *key,
 146         union xfs_btree_rec     *rec)
 147 {
 148         rec->inobt.ir_startino = key->inobt.ir_startino;
 149 }
 150
 151 STATIC void
 152 xfs_inobt_init_rec_from_cur(
 153         struct xfs_btree_cur    *cur,
 154         union xfs_btree_rec     *rec)
 155 {
 156         rec->inobt.ir_startino = cpu_to_be32(cur->bc_rec.i.ir_startino);
 157         rec->inobt.ir_freecount = cpu_to_be32(cur->bc_rec.i.ir_freecount);
 158         rec->inobt.ir_free = cpu_to_be64(cur->bc_rec.i.ir_free);
 159 }
 160
 161 /*
 162  * initial value of ptr for lookup
 163  */
 164 STATIC void
 165 xfs_inobt_init_ptr_from_cur(
 166         struct xfs_btree_cur    *cur,
 167         union xfs_btree_ptr     *ptr)
 168 {
 169         struct xfs_agi          *agi = XFS_BUF_TO_AGI(cur->bc_private.a.agbp);
 170
 171         ASSERT(cur->bc_private.a.agno == be32_to_cpu(agi->agi_seqno));
 172
 173         ptr->s = agi->agi_root;
 174 }
 175
 176 STATIC __int64_t
 177 xfs_inobt_key_diff(
 178         struct xfs_btree_cur    *cur,
 179         union xfs_btree_key     *key)
 180 {
 181         return (__int64_t)be32_to_cpu(key->inobt.ir_startino) -
 182                           cur->bc_rec.i.ir_startino;
 183 }
 184
 185 void
 186 xfs_inobt_verify(
 187         struct xfs_buf          *bp)
 188 {
 189         struct xfs_mount        *mp = bp->b_target->bt_mount;
 190         struct xfs_btree_block  *block = XFS_BUF_TO_BLOCK(bp);
 191         unsigned int            level;
 192         int                     sblock_ok; /* block passes checks */
 193
 194         /* magic number and level verification */
 195         level = be16_to_cpu(block->bb_level);
 196         sblock_ok = block->bb_magic == cpu_to_be32(XFS_IBT_MAGIC) &&
 197                     level < mp->m_in_maxlevels;
 198
 199         /* numrecs verification */
 200         sblock_ok = sblock_ok &&
 201                 be16_to_cpu(block->bb_numrecs) <= mp->m_inobt_mxr[level != 0];
 202
 203         /* sibling pointer verification */
 204         sblock_ok = sblock_ok &&
 205                 (block->bb_u.s.bb_leftsib == cpu_to_be32(NULLAGBLOCK) ||
 206                  be32_to_cpu(block->bb_u.s.bb_leftsib) < mp->m_sb.sb_agblocks) &&
 207                 block->bb_u.s.bb_leftsib &&
 208                 (block->bb_u.s.bb_rightsib == cpu_to_be32(NULLAGBLOCK) ||
 209                  be32_to_cpu(block->bb_u.s.bb_rightsib) < mp->m_sb.sb_agblocks) &&
 210                 block->bb_u.s.bb_rightsib;
 211
 212         if (!sblock_ok) {
 213                 trace_xfs_btree_corrupt(bp, _RET_IP_);
 214                 XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, block);
 215                 xfs_buf_ioerror(bp, EFSCORRUPTED);
 216         }
 217 }
 218
 219 static void
 220 xfs_inobt_read_verify(
 221         struct xfs_buf  *bp)
 222 {
 223         xfs_inobt_verify(bp);
 224 }
 225
 226 static void
 227 xfs_inobt_write_verify(
 228         struct xfs_buf  *bp)
 229 {
 230         xfs_inobt_verify(bp);
 231 }
 232
 233 const struct xfs_buf_ops xfs_inobt_buf_ops = {
 234         .verify_read = xfs_inobt_read_verify,
 235         .verify_write = xfs_inobt_write_verify,
 236 };
 237
 238 #ifdef DEBUG
 239 STATIC int
 240 xfs_inobt_keys_inorder(
 241         struct xfs_btree_cur    *cur,
 242         union xfs_btree_key     *k1,
 243         union xfs_btree_key     *k2)
 244 {
 245         return be32_to_cpu(k1->inobt.ir_startino) <
 246                 be32_to_cpu(k2->inobt.ir_startino);
 247 }
 248
 249 STATIC int
 250 xfs_inobt_recs_inorder(
 251         struct xfs_btree_cur    *cur,
 252         union xfs_btree_rec     *r1,
 253         union xfs_btree_rec     *r2)
 254 {
 255         return be32_to_cpu(r1->inobt.ir_startino) + XFS_INODES_PER_CHUNK <=
 256                 be32_to_cpu(r2->inobt.ir_startino);
 257 }
 258 #endif  /* DEBUG */
 259
 260 static const struct xfs_btree_ops xfs_inobt_ops = {
 261         .rec_len                = sizeof(xfs_inobt_rec_t),
 262         .key_len                = sizeof(xfs_inobt_key_t),
 263
 264         .dup_cursor             = xfs_inobt_dup_cursor,
 265         .set_root               = xfs_inobt_set_root,
 266         .alloc_block            = xfs_inobt_alloc_block,
 267         .free_block             = xfs_inobt_free_block,
 268         .get_minrecs            = xfs_inobt_get_minrecs,
 269         .get_maxrecs            = xfs_inobt_get_maxrecs,
 270         .init_key_from_rec      = xfs_inobt_init_key_from_rec,
 271         .init_rec_from_key      = xfs_inobt_init_rec_from_key,
 272         .init_rec_from_cur      = xfs_inobt_init_rec_from_cur,
 273         .init_ptr_from_cur      = xfs_inobt_init_ptr_from_cur,
 274         .key_diff               = xfs_inobt_key_diff,
 275         .buf_ops                = &xfs_inobt_buf_ops,
 276 #ifdef DEBUG
 277         .keys_inorder           = xfs_inobt_keys_inorder,
 278         .recs_inorder           = xfs_inobt_recs_inorder,
 279 #endif
 280 };
 281
 282 /*
 283  * Allocate a new inode btree cursor.
 284  */
 285 struct xfs_btree_cur *                          /* new inode btree cursor */
 286 xfs_inobt_init_cursor(
 287         struct xfs_mount        *mp,            /* file system mount point */
 288         struct xfs_trans        *tp,            /* transaction pointer */
 289         struct xfs_buf          *agbp,          /* buffer for agi structure */
 290         xfs_agnumber_t          agno)           /* allocation group number */
 291 {
 292         struct xfs_agi          *agi = XFS_BUF_TO_AGI(agbp);
 293         struct xfs_btree_cur    *cur;
 294
 295         cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP);
 296
 297         cur->bc_tp = tp;
 298         cur->bc_mp = mp;
 299         cur->bc_nlevels = be32_to_cpu(agi->agi_level);
 300         cur->bc_btnum = XFS_BTNUM_INO;
 301         cur->bc_blocklog = mp->m_sb.sb_blocklog;
 302
 303         cur->bc_ops = &xfs_inobt_ops;
 304
 305         cur->bc_private.a.agbp = agbp;
 306         cur->bc_private.a.agno = agno;
 307
 308         return cur;
 309 }
 310
 311 /*
 312  * Calculate number of records in an inobt btree block.
 313  */
 314 int
 315 xfs_inobt_maxrecs(
 316         struct xfs_mount        *mp,
 317         int                     blocklen,
 318         int                     leaf)
 319 {
 320         blocklen -= XFS_INOBT_BLOCK_LEN(mp);
 321
 322         if (leaf)
 323                 return blocklen / sizeof(xfs_inobt_rec_t);
 324         return blocklen / (sizeof(xfs_inobt_key_t) + sizeof(xfs_inobt_ptr_t));
 325 }