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