root/fs/xfs/libxfs/xfs_refcount_btree.h

INCLUDED FROM

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2016 Oracle.  All Rights Reserved.
   4  * Author: Darrick J. Wong <darrick.wong@oracle.com>
   5  */
   6 #ifndef __XFS_REFCOUNT_BTREE_H__
   7 #define __XFS_REFCOUNT_BTREE_H__
   8 
   9 /*
  10  * Reference Count Btree 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
  19  */
  20 #define XFS_REFCOUNT_BLOCK_LEN  XFS_BTREE_SBLOCK_CRC_LEN
  21 
  22 /*
  23  * Record, key, and pointer address macros for btree blocks.
  24  *
  25  * (note that some of these may appear unused, but they are used in userspace)
  26  */
  27 #define XFS_REFCOUNT_REC_ADDR(block, index) \
  28         ((struct xfs_refcount_rec *) \
  29                 ((char *)(block) + \
  30                  XFS_REFCOUNT_BLOCK_LEN + \
  31                  (((index) - 1) * sizeof(struct xfs_refcount_rec))))
  32 
  33 #define XFS_REFCOUNT_KEY_ADDR(block, index) \
  34         ((struct xfs_refcount_key *) \
  35                 ((char *)(block) + \
  36                  XFS_REFCOUNT_BLOCK_LEN + \
  37                  ((index) - 1) * sizeof(struct xfs_refcount_key)))
  38 
  39 #define XFS_REFCOUNT_PTR_ADDR(block, index, maxrecs) \
  40         ((xfs_refcount_ptr_t *) \
  41                 ((char *)(block) + \
  42                  XFS_REFCOUNT_BLOCK_LEN + \
  43                  (maxrecs) * sizeof(struct xfs_refcount_key) + \
  44                  ((index) - 1) * sizeof(xfs_refcount_ptr_t)))
  45 
  46 extern struct xfs_btree_cur *xfs_refcountbt_init_cursor(struct xfs_mount *mp,
  47                 struct xfs_trans *tp, struct xfs_buf *agbp,
  48                 xfs_agnumber_t agno);
  49 extern int xfs_refcountbt_maxrecs(int blocklen, bool leaf);
  50 extern void xfs_refcountbt_compute_maxlevels(struct xfs_mount *mp);
  51 
  52 extern xfs_extlen_t xfs_refcountbt_calc_size(struct xfs_mount *mp,
  53                 unsigned long long len);
  54 extern xfs_extlen_t xfs_refcountbt_max_size(struct xfs_mount *mp,
  55                 xfs_agblock_t agblocks);
  56 
  57 extern int xfs_refcountbt_calc_reserves(struct xfs_mount *mp,
  58                 struct xfs_trans *tp, xfs_agnumber_t agno, xfs_extlen_t *ask,
  59                 xfs_extlen_t *used);
  60 
  61 #endif  /* __XFS_REFCOUNT_BTREE_H__ */