1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2016 Oracle. All Rights Reserved.
4 * Author: Darrick J. Wong <darrick.wong@oracle.com>
6 #ifndef __XFS_REFCOUNT_BTREE_H__
7 #define __XFS_REFCOUNT_BTREE_H__
10 * Reference Count Btree on-disk structures
16 struct xbtree_afakeroot;
19 * Btree block header size
21 #define XFS_REFCOUNT_BLOCK_LEN XFS_BTREE_SBLOCK_CRC_LEN
24 * Record, key, and pointer address macros for btree blocks.
26 * (note that some of these may appear unused, but they are used in userspace)
28 #define XFS_REFCOUNT_REC_ADDR(block, index) \
29 ((struct xfs_refcount_rec *) \
31 XFS_REFCOUNT_BLOCK_LEN + \
32 (((index) - 1) * sizeof(struct xfs_refcount_rec))))
34 #define XFS_REFCOUNT_KEY_ADDR(block, index) \
35 ((struct xfs_refcount_key *) \
37 XFS_REFCOUNT_BLOCK_LEN + \
38 ((index) - 1) * sizeof(struct xfs_refcount_key)))
40 #define XFS_REFCOUNT_PTR_ADDR(block, index, maxrecs) \
41 ((xfs_refcount_ptr_t *) \
43 XFS_REFCOUNT_BLOCK_LEN + \
44 (maxrecs) * sizeof(struct xfs_refcount_key) + \
45 ((index) - 1) * sizeof(xfs_refcount_ptr_t)))
47 extern struct xfs_btree_cur *xfs_refcountbt_init_cursor(struct xfs_mount *mp,
48 struct xfs_trans *tp, struct xfs_buf *agbp,
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);
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);
60 extern int xfs_refcountbt_calc_reserves(struct xfs_mount *mp,
61 struct xfs_trans *tp, xfs_agnumber_t agno, xfs_extlen_t *ask,
64 void xfs_refcountbt_commit_staged_btree(struct xfs_btree_cur *cur,
65 struct xfs_trans *tp, struct xfs_buf *agbp);
67 #endif /* __XFS_REFCOUNT_BTREE_H__ */