fs/xfs/xfs_ialloc_btree.h

   1 /*
   2  * Copyright (c) 2000,2005 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 #ifndef __XFS_IALLOC_BTREE_H__
  19 #define __XFS_IALLOC_BTREE_H__
  20
  21 /*
  22  * Inode map on-disk structures
  23  */
  24
  25 struct xfs_buf;
  26 struct xfs_btree_cur;
  27 struct xfs_btree_sblock;
  28 struct xfs_mount;
  29
  30 /*
  31  * There is a btree for the inode map per allocation group.
  32  */
  33 #define XFS_IBT_MAGIC   0x49414254      /* 'IABT' */
  34
  35 typedef __uint64_t      xfs_inofree_t;
  36 #define XFS_INODES_PER_CHUNK    (NBBY * sizeof(xfs_inofree_t))
  37 #define XFS_INODES_PER_CHUNK_LOG        (XFS_NBBYLOG + 3)
  38 #define XFS_INOBT_ALL_FREE      ((xfs_inofree_t)-1)
  39
  40 #define XFS_INOBT_MASKN(i,n)            xfs_inobt_maskn(i,n)
  41 static inline xfs_inofree_t xfs_inobt_maskn(int i, int n)
  42 {
  43         return (((n) >= XFS_INODES_PER_CHUNK ? \
  44                 (xfs_inofree_t)0 : ((xfs_inofree_t)1 << (n))) - 1) << (i);
  45 }
  46
  47 /*
  48  * Data record structure
  49  */
  50 typedef struct xfs_inobt_rec {
  51         __be32          ir_startino;    /* starting inode number */
  52         __be32          ir_freecount;   /* count of free inodes (set bits) */
  53         __be64          ir_free;        /* free inode mask */
  54 } xfs_inobt_rec_t;
  55
  56 typedef struct xfs_inobt_rec_incore {
  57         xfs_agino_t     ir_startino;    /* starting inode number */
  58         __int32_t       ir_freecount;   /* count of free inodes (set bits) */
  59         xfs_inofree_t   ir_free;        /* free inode mask */
  60 } xfs_inobt_rec_incore_t;
  61
  62
  63 /*
  64  * Key structure
  65  */
  66 typedef struct xfs_inobt_key {
  67         __be32          ir_startino;    /* starting inode number */
  68 } xfs_inobt_key_t;
  69
  70 /* btree pointer type */
  71 typedef __be32 xfs_inobt_ptr_t;
  72
  73 /* btree block header type */
  74 typedef struct xfs_btree_sblock xfs_inobt_block_t;
  75
  76 #define XFS_BUF_TO_INOBT_BLOCK(bp)      ((xfs_inobt_block_t *)XFS_BUF_PTR(bp))
  77
  78 /*
  79  * Bit manipulations for ir_free.
  80  */
  81 #define XFS_INOBT_MASK(i)               ((xfs_inofree_t)1 << (i))
  82 #define XFS_INOBT_IS_FREE(rp,i)         \
  83                 (((rp)->ir_free & XFS_INOBT_MASK(i)) != 0)
  84 #define XFS_INOBT_IS_FREE_DISK(rp,i)    \
  85                 ((be64_to_cpu((rp)->ir_free) & XFS_INOBT_MASK(i)) != 0)
  86 #define XFS_INOBT_SET_FREE(rp,i)        ((rp)->ir_free |= XFS_INOBT_MASK(i))
  87 #define XFS_INOBT_CLR_FREE(rp,i)        ((rp)->ir_free &= ~XFS_INOBT_MASK(i))
  88
  89 /*
  90  * Real block structures have a size equal to the disk block size.
  91  */
  92 #define XFS_INOBT_BLOCK_MAXRECS(lev,cur) ((cur)->bc_mp->m_inobt_mxr[lev != 0])
  93 #define XFS_INOBT_BLOCK_MINRECS(lev,cur) ((cur)->bc_mp->m_inobt_mnr[lev != 0])
  94 #define XFS_INOBT_IS_LAST_REC(cur)      \
  95         ((cur)->bc_ptrs[0] == be16_to_cpu(XFS_BUF_TO_INOBT_BLOCK((cur)->bc_bufs[0])->bb_numrecs))
  96
  97 /*
  98  * Maximum number of inode btree levels.
  99  */
 100 #define XFS_IN_MAXLEVELS(mp)            ((mp)->m_in_maxlevels)
 101
 102 /*
 103  * block numbers in the AG.
 104  */
 105 #define XFS_IBT_BLOCK(mp)               ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1))
 106 #define XFS_PREALLOC_BLOCKS(mp)         ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1))
 107
 108 /*
 109  * Record, key, and pointer address macros for btree blocks.
 110  */
 111 #define XFS_INOBT_REC_ADDR(bb,i,cur) \
 112         (XFS_BTREE_REC_ADDR(xfs_inobt, bb, i))
 113
 114 #define XFS_INOBT_KEY_ADDR(bb,i,cur) \
 115         (XFS_BTREE_KEY_ADDR(xfs_inobt, bb, i))
 116
 117 #define XFS_INOBT_PTR_ADDR(bb,i,cur) \
 118         (XFS_BTREE_PTR_ADDR(xfs_inobt, bb, \
 119                                 i, XFS_INOBT_BLOCK_MAXRECS(1, cur)))
 120
 121 /*
 122  * Decrement cursor by one record at the level.
 123  * For nonzero levels the leaf-ward information is untouched.
 124  */
 125 extern int xfs_inobt_decrement(struct xfs_btree_cur *cur, int level, int *stat);
 126
 127 /*
 128  * Delete the record pointed to by cur.
 129  * The cursor refers to the place where the record was (could be inserted)
 130  * when the operation returns.
 131  */
 132 extern int xfs_inobt_delete(struct xfs_btree_cur *cur, int *stat);
 133
 134 /*
 135  * Get the data from the pointed-to record.
 136  */
 137 extern int xfs_inobt_get_rec(struct xfs_btree_cur *cur, xfs_agino_t *ino,
 138                              __int32_t *fcnt, xfs_inofree_t *free, int *stat);
 139
 140 /*
 141  * Increment cursor by one record at the level.
 142  * For nonzero levels the leaf-ward information is untouched.
 143  */
 144 extern int xfs_inobt_increment(struct xfs_btree_cur *cur, int level, int *stat);
 145
 146 /*
 147  * Insert the current record at the point referenced by cur.
 148  * The cursor may be inconsistent on return if splits have been done.
 149  */
 150 extern int xfs_inobt_insert(struct xfs_btree_cur *cur, int *stat);
 151
 152 /*
 153  * Lookup the record equal to ino in the btree given by cur.
 154  */
 155 extern int xfs_inobt_lookup_eq(struct xfs_btree_cur *cur, xfs_agino_t ino,
 156                                 __int32_t fcnt, xfs_inofree_t free, int *stat);
 157
 158 /*
 159  * Lookup the first record greater than or equal to ino
 160  * in the btree given by cur.
 161  */
 162 extern int xfs_inobt_lookup_ge(struct xfs_btree_cur *cur, xfs_agino_t ino,
 163                                 __int32_t fcnt, xfs_inofree_t free, int *stat);
 164
 165 /*
 166  * Lookup the first record less than or equal to ino
 167  * in the btree given by cur.
 168  */
 169 extern int xfs_inobt_lookup_le(struct xfs_btree_cur *cur, xfs_agino_t ino,
 170                                 __int32_t fcnt, xfs_inofree_t free, int *stat);
 171
 172 /*
 173  * Update the record referred to by cur, to the value given
 174  * by [ino, fcnt, free].
 175  * This either works (return 0) or gets an EFSCORRUPTED error.
 176  */
 177 extern int xfs_inobt_update(struct xfs_btree_cur *cur, xfs_agino_t ino,
 178                                 __int32_t fcnt, xfs_inofree_t free);
 179
 180 #endif  /* __XFS_IALLOC_BTREE_H__ */