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 xfs_perag;
  17 struct xbtree_afakeroot;
  18
  19 /*
  20  * Btree block header size
  21  */
  22 #define XFS_REFCOUNT_BLOCK_LEN  XFS_BTREE_SBLOCK_CRC_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_REFCOUNT_REC_ADDR(block, index) \
  30         ((struct xfs_refcount_rec *) \
  31                 ((char *)(block) + \
  32                  XFS_REFCOUNT_BLOCK_LEN + \
  33                  (((index) - 1) * sizeof(struct xfs_refcount_rec))))
  34
  35 #define XFS_REFCOUNT_KEY_ADDR(block, index) \
  36         ((struct xfs_refcount_key *) \
  37                 ((char *)(block) + \
  38                  XFS_REFCOUNT_BLOCK_LEN + \
  39                  ((index) - 1) * sizeof(struct xfs_refcount_key)))
  40
  41 #define XFS_REFCOUNT_PTR_ADDR(block, index, maxrecs) \
  42         ((xfs_refcount_ptr_t *) \
  43                 ((char *)(block) + \
  44                  XFS_REFCOUNT_BLOCK_LEN + \
  45                  (maxrecs) * sizeof(struct xfs_refcount_key) + \
  46                  ((index) - 1) * sizeof(xfs_refcount_ptr_t)))
  47
  48 extern struct xfs_btree_cur *xfs_refcountbt_init_cursor(struct xfs_mount *mp,
  49                 struct xfs_trans *tp, struct xfs_buf *agbp,
  50                 struct xfs_perag *pag);
  51 struct xfs_btree_cur *xfs_refcountbt_stage_cursor(struct xfs_mount *mp,
  52                 struct xbtree_afakeroot *afake, struct xfs_perag *pag);
  53 extern int xfs_refcountbt_maxrecs(int blocklen, bool leaf);
  54 extern void xfs_refcountbt_compute_maxlevels(struct xfs_mount *mp);
  55
  56 extern xfs_extlen_t xfs_refcountbt_calc_size(struct xfs_mount *mp,
  57                 unsigned long long len);
  58 extern xfs_extlen_t xfs_refcountbt_max_size(struct xfs_mount *mp,
  59                 xfs_agblock_t agblocks);
  60
  61 extern int xfs_refcountbt_calc_reserves(struct xfs_mount *mp,
  62                 struct xfs_trans *tp, struct xfs_perag *pag, xfs_extlen_t *ask,
  63                 xfs_extlen_t *used);
  64
  65 void xfs_refcountbt_commit_staged_btree(struct xfs_btree_cur *cur,
  66                 struct xfs_trans *tp, struct xfs_buf *agbp);
  67
  68 unsigned int xfs_refcountbt_maxlevels_ondisk(void);
  69
  70 int __init xfs_refcountbt_init_cur_cache(void);
  71 void xfs_refcountbt_destroy_cur_cache(void);
  72
  73 #endif  /* __XFS_REFCOUNT_BTREE_H__ */