libxfs/xfs_alloc_btree.h

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2000,2005 Silicon Graphics, Inc.
   4  * All Rights Reserved.
   5  */
   6 #ifndef __XFS_ALLOC_BTREE_H__
   7 #define __XFS_ALLOC_BTREE_H__
   8
   9 /*
  10  * Freespace on-disk structures
  11  */
  12
  13 struct xfs_buf;
  14 struct xfs_btree_cur;
  15 struct xfs_mount;
  16
  17 /*
  18  * Btree block header size depends on a superblock flag.
  19  */
  20 #define XFS_ALLOC_BLOCK_LEN(mp) \
  21         (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
  22                 XFS_BTREE_SBLOCK_CRC_LEN : XFS_BTREE_SBLOCK_LEN)
  23
  24 /*
  25  * Record, key, and pointer address macros for btree blocks.
  26  *
  27  * (note that some of these may appear unused, but they are used in userspace)
  28  */
  29 #define XFS_ALLOC_REC_ADDR(mp, block, index) \
  30         ((xfs_alloc_rec_t *) \
  31                 ((char *)(block) + \
  32                  XFS_ALLOC_BLOCK_LEN(mp) + \
  33                  (((index) - 1) * sizeof(xfs_alloc_rec_t))))
  34
  35 #define XFS_ALLOC_KEY_ADDR(mp, block, index) \
  36         ((xfs_alloc_key_t *) \
  37                 ((char *)(block) + \
  38                  XFS_ALLOC_BLOCK_LEN(mp) + \
  39                  ((index) - 1) * sizeof(xfs_alloc_key_t)))
  40
  41 #define XFS_ALLOC_PTR_ADDR(mp, block, index, maxrecs) \
  42         ((xfs_alloc_ptr_t *) \
  43                 ((char *)(block) + \
  44                  XFS_ALLOC_BLOCK_LEN(mp) + \
  45                  (maxrecs) * sizeof(xfs_alloc_key_t) + \
  46                  ((index) - 1) * sizeof(xfs_alloc_ptr_t)))
  47
  48 extern struct xfs_btree_cur *xfs_allocbt_init_cursor(struct xfs_mount *,
  49                 struct xfs_trans *, struct xfs_buf *,
  50                 xfs_agnumber_t, xfs_btnum_t);
  51 extern int xfs_allocbt_maxrecs(struct xfs_mount *, int, int);
  52 extern xfs_extlen_t xfs_allocbt_calc_size(struct xfs_mount *mp,
  53                 unsigned long long len);
  54
  55 #endif  /* __XFS_ALLOC_BTREE_H__ */