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/*
* Copyright (C) 2016 Oracle. All Rights Reserved.
*
* Author: Darrick J. Wong <darrick.wong@oracle.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef __XFS_REFCOUNT_BTREE_H__
#define __XFS_REFCOUNT_BTREE_H__
/*
* Reference Count Btree on-disk structures
*/
struct xfs_buf;
struct xfs_btree_cur;
struct xfs_mount;
/*
* Btree block header size
*/
#define XFS_REFCOUNT_BLOCK_LEN XFS_BTREE_SBLOCK_CRC_LEN
/*
* Record, key, and pointer address macros for btree blocks.
*
* (note that some of these may appear unused, but they are used in userspace)
*/
#define XFS_REFCOUNT_REC_ADDR(block, index) \
((struct xfs_refcount_rec *) \
((char *)(block) + \
XFS_REFCOUNT_BLOCK_LEN + \
(((index) - 1) * sizeof(struct xfs_refcount_rec))))
#define XFS_REFCOUNT_KEY_ADDR(block, index) \
((struct xfs_refcount_key *) \
((char *)(block) + \
XFS_REFCOUNT_BLOCK_LEN + \
((index) - 1) * sizeof(struct xfs_refcount_key)))
#define XFS_REFCOUNT_PTR_ADDR(block, index, maxrecs) \
((xfs_refcount_ptr_t *) \
((char *)(block) + \
XFS_REFCOUNT_BLOCK_LEN + \
(maxrecs) * sizeof(struct xfs_refcount_key) + \
((index) - 1) * sizeof(xfs_refcount_ptr_t)))
extern struct xfs_btree_cur *xfs_refcountbt_init_cursor(struct xfs_mount *mp,
struct xfs_trans *tp, struct xfs_buf *agbp, xfs_agnumber_t agno,
struct xfs_defer_ops *dfops);
extern int xfs_refcountbt_maxrecs(struct xfs_mount *mp, int blocklen,
bool leaf);
extern void xfs_refcountbt_compute_maxlevels(struct xfs_mount *mp);
extern xfs_extlen_t xfs_refcountbt_calc_size(struct xfs_mount *mp,
unsigned long long len);
extern xfs_extlen_t xfs_refcountbt_max_size(struct xfs_mount *mp);
extern int xfs_refcountbt_calc_reserves(struct xfs_mount *mp,
xfs_agnumber_t agno, xfs_extlen_t *ask, xfs_extlen_t *used);
#endif /* __XFS_REFCOUNT_BTREE_H__ */
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