root/fs/xfs/libxfs/xfs_bmap_btree.h

INCLUDED FROM

   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 
   9 struct xfs_btree_cur;
  10 struct xfs_btree_block;
  11 struct xfs_mount;
  12 struct xfs_inode;
  13 struct 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  */
  87 extern void xfs_bmdr_to_bmbt(struct xfs_inode *, xfs_bmdr_block_t *, int,
  88                         struct xfs_btree_block *, int);
  89 
  90 void xfs_bmbt_disk_set_all(struct xfs_bmbt_rec *r, struct xfs_bmbt_irec *s);
  91 extern xfs_filblks_t xfs_bmbt_disk_get_blockcount(xfs_bmbt_rec_t *r);
  92 extern xfs_fileoff_t xfs_bmbt_disk_get_startoff(xfs_bmbt_rec_t *r);
  93 extern void xfs_bmbt_disk_get_all(xfs_bmbt_rec_t *r, xfs_bmbt_irec_t *s);
  94 
  95 extern void xfs_bmbt_to_bmdr(struct xfs_mount *, struct xfs_btree_block *, int,
  96                         xfs_bmdr_block_t *, int);
  97 
  98 extern int xfs_bmbt_get_maxrecs(struct xfs_btree_cur *, int level);
  99 extern int xfs_bmdr_maxrecs(int blocklen, int leaf);
 100 extern int xfs_bmbt_maxrecs(struct xfs_mount *, int blocklen, int leaf);
 101 
 102 extern 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 
 106 extern struct xfs_btree_cur *xfs_bmbt_init_cursor(struct xfs_mount *,
 107                 struct xfs_trans *, struct xfs_inode *, int);
 108 
 109 extern unsigned long long xfs_bmbt_calc_size(struct xfs_mount *mp,
 110                 unsigned long long len);
 111 
 112 #endif  /* __XFS_BMAP_BTREE_H__ */