fs/xfs/xfs_bmap_btree.h

   1 /*
   2  * Copyright (c) 2000,2002-2005 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_BMAP_BTREE_H__
  19 #define __XFS_BMAP_BTREE_H__
  20
  21 struct xfs_btree_cur;
  22 struct xfs_btree_block;
  23 struct xfs_mount;
  24 struct xfs_inode;
  25 struct xfs_trans;
  26
  27 /*
  28  * Extent state and extent format macros.
  29  */
  30 #define XFS_EXTFMT_INODE(x)     \
  31         (xfs_sb_version_hasextflgbit(&((x)->i_mount->m_sb)) ? \
  32                 XFS_EXTFMT_HASSTATE : XFS_EXTFMT_NOSTATE)
  33 #define ISUNWRITTEN(x)  ((x)->br_state == XFS_EXT_UNWRITTEN)
  34
  35 /*
  36  * Btree block header size depends on a superblock flag.
  37  */
  38 #define XFS_BMBT_BLOCK_LEN(mp) \
  39         (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
  40                 XFS_BTREE_LBLOCK_CRC_LEN : XFS_BTREE_LBLOCK_LEN)
  41
  42 #define XFS_BMBT_REC_ADDR(mp, block, index) \
  43         ((xfs_bmbt_rec_t *) \
  44                 ((char *)(block) + \
  45                  XFS_BMBT_BLOCK_LEN(mp) + \
  46                  ((index) - 1) * sizeof(xfs_bmbt_rec_t)))
  47
  48 #define XFS_BMBT_KEY_ADDR(mp, block, index) \
  49         ((xfs_bmbt_key_t *) \
  50                 ((char *)(block) + \
  51                  XFS_BMBT_BLOCK_LEN(mp) + \
  52                  ((index) - 1) * sizeof(xfs_bmbt_key_t)))
  53
  54 #define XFS_BMBT_PTR_ADDR(mp, block, index, maxrecs) \
  55         ((xfs_bmbt_ptr_t *) \
  56                 ((char *)(block) + \
  57                  XFS_BMBT_BLOCK_LEN(mp) + \
  58                  (maxrecs) * sizeof(xfs_bmbt_key_t) + \
  59                  ((index) - 1) * sizeof(xfs_bmbt_ptr_t)))
  60
  61 #define XFS_BMDR_REC_ADDR(block, index) \
  62         ((xfs_bmdr_rec_t *) \
  63                 ((char *)(block) + \
  64                  sizeof(struct xfs_bmdr_block) + \
  65                  ((index) - 1) * sizeof(xfs_bmdr_rec_t)))
  66
  67 #define XFS_BMDR_KEY_ADDR(block, index) \
  68         ((xfs_bmdr_key_t *) \
  69                 ((char *)(block) + \
  70                  sizeof(struct xfs_bmdr_block) + \
  71                  ((index) - 1) * sizeof(xfs_bmdr_key_t)))
  72
  73 #define XFS_BMDR_PTR_ADDR(block, index, maxrecs) \
  74         ((xfs_bmdr_ptr_t *) \
  75                 ((char *)(block) + \
  76                  sizeof(struct xfs_bmdr_block) + \
  77                  (maxrecs) * sizeof(xfs_bmdr_key_t) + \
  78                  ((index) - 1) * sizeof(xfs_bmdr_ptr_t)))
  79
  80 /*
  81  * These are to be used when we know the size of the block and
  82  * we don't have a cursor.
  83  */
  84 #define XFS_BMAP_BROOT_PTR_ADDR(mp, bb, i, sz) \
  85         XFS_BMBT_PTR_ADDR(mp, bb, i, xfs_bmbt_maxrecs(mp, sz, 0))
  86
  87 #define XFS_BMAP_BROOT_SPACE_CALC(mp, nrecs) \
  88         (int)(XFS_BMBT_BLOCK_LEN(mp) + \
  89                ((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
  90
  91 #define XFS_BMAP_BROOT_SPACE(mp, bb) \
  92         (XFS_BMAP_BROOT_SPACE_CALC(mp, be16_to_cpu((bb)->bb_numrecs)))
  93 #define XFS_BMDR_SPACE_CALC(nrecs) \
  94         (int)(sizeof(xfs_bmdr_block_t) + \
  95                ((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
  96 #define XFS_BMAP_BMDR_SPACE(bb) \
  97         (XFS_BMDR_SPACE_CALC(be16_to_cpu((bb)->bb_numrecs)))
  98
  99 /*
 100  * Maximum number of bmap btree levels.
 101  */
 102 #define XFS_BM_MAXLEVELS(mp,w)          ((mp)->m_bm_maxlevels[(w)])
 103
 104 /*
 105  * Prototypes for xfs_bmap.c to call.
 106  */
 107 extern void xfs_bmdr_to_bmbt(struct xfs_inode *, xfs_bmdr_block_t *, int,
 108                         struct xfs_btree_block *, int);
 109 extern void xfs_bmbt_get_all(xfs_bmbt_rec_host_t *r, xfs_bmbt_irec_t *s);
 110 extern xfs_filblks_t xfs_bmbt_get_blockcount(xfs_bmbt_rec_host_t *r);
 111 extern xfs_fsblock_t xfs_bmbt_get_startblock(xfs_bmbt_rec_host_t *r);
 112 extern xfs_fileoff_t xfs_bmbt_get_startoff(xfs_bmbt_rec_host_t *r);
 113 extern xfs_exntst_t xfs_bmbt_get_state(xfs_bmbt_rec_host_t *r);
 114
 115 extern xfs_filblks_t xfs_bmbt_disk_get_blockcount(xfs_bmbt_rec_t *r);
 116 extern xfs_fileoff_t xfs_bmbt_disk_get_startoff(xfs_bmbt_rec_t *r);
 117
 118 extern void xfs_bmbt_set_all(xfs_bmbt_rec_host_t *r, xfs_bmbt_irec_t *s);
 119 extern void xfs_bmbt_set_allf(xfs_bmbt_rec_host_t *r, xfs_fileoff_t o,
 120                         xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);
 121 extern void xfs_bmbt_set_blockcount(xfs_bmbt_rec_host_t *r, xfs_filblks_t v);
 122 extern void xfs_bmbt_set_startblock(xfs_bmbt_rec_host_t *r, xfs_fsblock_t v);
 123 extern void xfs_bmbt_set_startoff(xfs_bmbt_rec_host_t *r, xfs_fileoff_t v);
 124 extern void xfs_bmbt_set_state(xfs_bmbt_rec_host_t *r, xfs_exntst_t v);
 125
 126 extern void xfs_bmbt_disk_set_allf(xfs_bmbt_rec_t *r, xfs_fileoff_t o,
 127                         xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);
 128
 129 extern void xfs_bmbt_to_bmdr(struct xfs_mount *, struct xfs_btree_block *, int,
 130                         xfs_bmdr_block_t *, int);
 131
 132 extern int xfs_bmbt_get_maxrecs(struct xfs_btree_cur *, int level);
 133 extern int xfs_bmdr_maxrecs(int blocklen, int leaf);
 134 extern int xfs_bmbt_maxrecs(struct xfs_mount *, int blocklen, int leaf);
 135
 136 extern int xfs_bmbt_change_owner(struct xfs_trans *tp, struct xfs_inode *ip,
 137                                  int whichfork, xfs_ino_t new_owner,
 138                                  struct list_head *buffer_list);
 139
 140 extern struct xfs_btree_cur *xfs_bmbt_init_cursor(struct xfs_mount *,
 141                 struct xfs_trans *, struct xfs_inode *, int);
 142
 143 #endif  /* __XFS_BMAP_BTREE_H__ */