LXR linux/fs/xfs/libxfs/xfs_bmap

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * Copyright (c) 2000,2002-2005 Silicon Graphics, Inc.
   4 * All Rights Reserved.
   5 */
   6#ifndef __XFS_BMAP_BTREE_H__
   7#define __XFS_BMAP_BTREE_H__
   8
   9struct xfs_btree_cur;
  10struct xfs_btree_block;
  11struct xfs_mount;
  12struct xfs_inode;
  13struct xfs_trans;
  14
  15/*
  16 * Btree block header size depends on a superblock flag.
  17 */
  18#define XFS_BMBT_BLOCK_LEN(mp) \
  19        (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
  20                XFS_BTREE_LBLOCK_CRC_LEN : XFS_BTREE_LBLOCK_LEN)
  21
  22#define XFS_BMBT_REC_ADDR(mp, block, index) \
  23        ((xfs_bmbt_rec_t *) \
  24                ((char *)(block) + \
  25                 XFS_BMBT_BLOCK_LEN(mp) + \
  26                 ((index) - 1) * sizeof(xfs_bmbt_rec_t)))
  27
  28#define XFS_BMBT_KEY_ADDR(mp, block, index) \
  29        ((xfs_bmbt_key_t *) \
  30                ((char *)(block) + \
  31                 XFS_BMBT_BLOCK_LEN(mp) + \
  32                 ((index) - 1) * sizeof(xfs_bmbt_key_t)))
  33
  34#define XFS_BMBT_PTR_ADDR(mp, block, index, maxrecs) \
  35        ((xfs_bmbt_ptr_t *) \
  36                ((char *)(block) + \
  37                 XFS_BMBT_BLOCK_LEN(mp) + \
  38                 (maxrecs) * sizeof(xfs_bmbt_key_t) + \
  39                 ((index) - 1) * sizeof(xfs_bmbt_ptr_t)))
  40
  41#define XFS_BMDR_REC_ADDR(block, index) \
  42        ((xfs_bmdr_rec_t *) \
  43                ((char *)(block) + \
  44                 sizeof(struct xfs_bmdr_block) + \
  45                 ((index) - 1) * sizeof(xfs_bmdr_rec_t)))
  46
  47#define XFS_BMDR_KEY_ADDR(block, index) \
  48        ((xfs_bmdr_key_t *) \
  49                ((char *)(block) + \
  50                 sizeof(struct xfs_bmdr_block) + \
  51                 ((index) - 1) * sizeof(xfs_bmdr_key_t)))
  52
  53#define XFS_BMDR_PTR_ADDR(block, index, maxrecs) \
  54        ((xfs_bmdr_ptr_t *) \
  55                ((char *)(block) + \
  56                 sizeof(struct xfs_bmdr_block) + \
  57                 (maxrecs) * sizeof(xfs_bmdr_key_t) + \
  58                 ((index) - 1) * sizeof(xfs_bmdr_ptr_t)))
  59
  60/*
  61 * These are to be used when we know the size of the block and
  62 * we don't have a cursor.
  63 */
  64#define XFS_BMAP_BROOT_PTR_ADDR(mp, bb, i, sz) \
  65        XFS_BMBT_PTR_ADDR(mp, bb, i, xfs_bmbt_maxrecs(mp, sz, 0))
  66
  67#define XFS_BMAP_BROOT_SPACE_CALC(mp, nrecs) \
  68        (int)(XFS_BMBT_BLOCK_LEN(mp) + \
  69               ((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
  70
  71#define XFS_BMAP_BROOT_SPACE(mp, bb) \
  72        (XFS_BMAP_BROOT_SPACE_CALC(mp, be16_to_cpu((bb)->bb_numrecs)))
  73#define XFS_BMDR_SPACE_CALC(nrecs) \
  74        (int)(sizeof(xfs_bmdr_block_t) + \
  75               ((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
  76#define XFS_BMAP_BMDR_SPACE(bb) \
  77        (XFS_BMDR_SPACE_CALC(be16_to_cpu((bb)->bb_numrecs)))
  78
  79/*
  80 * Maximum number of bmap btree levels.
  81 */
  82#define XFS_BM_MAXLEVELS(mp,w)          ((mp)->m_bm_maxlevels[(w)])
  83
  84/*
  85 * Prototypes for xfs_bmap.c to call.
  86 */
  87extern void xfs_bmdr_to_bmbt(struct xfs_inode *, xfs_bmdr_block_t *, int,
  88                        struct xfs_btree_block *, int);
  89
  90void xfs_bmbt_disk_set_all(struct xfs_bmbt_rec *r, struct xfs_bmbt_irec *s);
  91extern xfs_filblks_t xfs_bmbt_disk_get_blockcount(xfs_bmbt_rec_t *r);
  92extern xfs_fileoff_t xfs_bmbt_disk_get_startoff(xfs_bmbt_rec_t *r);
  93extern void xfs_bmbt_disk_get_all(xfs_bmbt_rec_t *r, xfs_bmbt_irec_t *s);
  94
  95extern void xfs_bmbt_to_bmdr(struct xfs_mount *, struct xfs_btree_block *, int,
  96                        xfs_bmdr_block_t *, int);
  97
  98extern int xfs_bmbt_get_maxrecs(struct xfs_btree_cur *, int level);
  99extern int xfs_bmdr_maxrecs(int blocklen, int leaf);
 100extern int xfs_bmbt_maxrecs(struct xfs_mount *, int blocklen, int leaf);
 101
 102extern int xfs_bmbt_change_owner(struct xfs_trans *tp, struct xfs_inode *ip,
 103                                 int whichfork, xfs_ino_t new_owner,
 104                                 struct list_head *buffer_list);
 105
 106extern struct xfs_btree_cur *xfs_bmbt_init_cursor(struct xfs_mount *,
 107                struct xfs_trans *, struct xfs_inode *, int);
 108
 109extern unsigned long long xfs_bmbt_calc_size(struct xfs_mount *mp,
 110                unsigned long long len);
 111
 112#endif  /* __XFS_BMAP_BTREE_H__ */
 113