LXR linux/fs/xfs/libxfs/xfs_bmap

   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
  21struct xfs_btree_cur;
  22struct xfs_btree_block;
  23struct xfs_mount;
  24struct xfs_inode;
  25struct 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 */
 107extern void xfs_bmdr_to_bmbt(struct xfs_inode *, xfs_bmdr_block_t *, int,
 108                        struct xfs_btree_block *, int);
 109extern void xfs_bmbt_get_all(xfs_bmbt_rec_host_t *r, xfs_bmbt_irec_t *s);
 110extern xfs_filblks_t xfs_bmbt_get_blockcount(xfs_bmbt_rec_host_t *r);
 111extern xfs_fsblock_t xfs_bmbt_get_startblock(xfs_bmbt_rec_host_t *r);
 112extern xfs_fileoff_t xfs_bmbt_get_startoff(xfs_bmbt_rec_host_t *r);
 113extern xfs_exntst_t xfs_bmbt_get_state(xfs_bmbt_rec_host_t *r);
 114
 115extern xfs_filblks_t xfs_bmbt_disk_get_blockcount(xfs_bmbt_rec_t *r);
 116extern xfs_fileoff_t xfs_bmbt_disk_get_startoff(xfs_bmbt_rec_t *r);
 117
 118extern void xfs_bmbt_set_all(xfs_bmbt_rec_host_t *r, xfs_bmbt_irec_t *s);
 119extern 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);
 121extern void xfs_bmbt_set_blockcount(xfs_bmbt_rec_host_t *r, xfs_filblks_t v);
 122extern void xfs_bmbt_set_startblock(xfs_bmbt_rec_host_t *r, xfs_fsblock_t v);
 123extern void xfs_bmbt_set_startoff(xfs_bmbt_rec_host_t *r, xfs_fileoff_t v);
 124extern void xfs_bmbt_set_state(xfs_bmbt_rec_host_t *r, xfs_exntst_t v);
 125
 126extern 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
 129extern void xfs_bmbt_to_bmdr(struct xfs_mount *, struct xfs_btree_block *, int,
 130                        xfs_bmdr_block_t *, int);
 131
 132extern int xfs_bmbt_get_maxrecs(struct xfs_btree_cur *, int level);
 133extern int xfs_bmdr_maxrecs(int blocklen, int leaf);
 134extern int xfs_bmbt_maxrecs(struct xfs_mount *, int blocklen, int leaf);
 135
 136extern 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
 140extern 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__ */
 144