fs/xfs/libxfs/xfs_refcount_btree.h

   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 struct xbtree_afakeroot;
  17
  18 /*
  19  * Btree block header size
  20  */
  21 #define XFS_REFCOUNT_BLOCK_LEN  XFS_BTREE_SBLOCK_CRC_LEN
  22
  23 /*
  24  * Record, key, and pointer address macros for btree blocks.
  25  *
  26  * (note that some of these may appear unused, but they are used in userspace)
  27  */
  28 #define XFS_REFCOUNT_REC_ADDR(block, index) \
  29         ((struct xfs_refcount_rec *) \
  30                 ((char *)(block) + \
  31                  XFS_REFCOUNT_BLOCK_LEN + \
  32                  (((index) - 1) * sizeof(struct xfs_refcount_rec))))
  33
  34 #define XFS_REFCOUNT_KEY_ADDR(block, index) \
  35         ((struct xfs_refcount_key *) \
  36                 ((char *)(block) + \
  37                  XFS_REFCOUNT_BLOCK_LEN + \
  38                  ((index) - 1) * sizeof(struct xfs_refcount_key)))
  39
  40 #define XFS_REFCOUNT_PTR_ADDR(block, index, maxrecs) \
  41         ((xfs_refcount_ptr_t *) \
  42                 ((char *)(block) + \
  43                  XFS_REFCOUNT_BLOCK_LEN + \
  44                  (maxrecs) * sizeof(struct xfs_refcount_key) + \
  45                  ((index) - 1) * sizeof(xfs_refcount_ptr_t)))
  46
  47 extern struct xfs_btree_cur *xfs_refcountbt_init_cursor(struct xfs_mount *mp,
  48                 struct xfs_trans *tp, struct xfs_buf *agbp,
  49                 xfs_agnumber_t agno);
  50 struct xfs_btree_cur *xfs_refcountbt_stage_cursor(struct xfs_mount *mp,
  51                 struct xbtree_afakeroot *afake, xfs_agnumber_t agno);
  52 extern int xfs_refcountbt_maxrecs(int blocklen, bool leaf);
  53 extern void xfs_refcountbt_compute_maxlevels(struct xfs_mount *mp);
  54
  55 extern xfs_extlen_t xfs_refcountbt_calc_size(struct xfs_mount *mp,
  56                 unsigned long long len);
  57 extern xfs_extlen_t xfs_refcountbt_max_size(struct xfs_mount *mp,
  58                 xfs_agblock_t agblocks);
  59
  60 extern int xfs_refcountbt_calc_reserves(struct xfs_mount *mp,
  61                 struct xfs_trans *tp, xfs_agnumber_t agno, xfs_extlen_t *ask,
  62                 xfs_extlen_t *used);
  63
  64 void xfs_refcountbt_commit_staged_btree(struct xfs_btree_cur *cur,
  65                 struct xfs_trans *tp, struct xfs_buf *agbp);
  66
  67 #endif  /* __XFS_REFCOUNT_BTREE_H__ */