[thirdparty/xfsprogs-dev.git] / libxfs / xfs_refcount_btree.h

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2016 Oracle.  All Rights Reserved.
 * Author: Darrick J. Wong <darrick.wong@oracle.com>
 */
#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(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,
		xfs_agblock_t agblocks);

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__ */
Commit	Line	Data
37b3b4d6	1	// SPDX-License-Identifier: GPL-2.0+
d8079fe0 DW	2	/*
d8079fe0 DW	3	* Copyright (C) 2016 Oracle. All Rights Reserved.
d8079fe0	4	* Author: Darrick J. Wong <darrick.wong@oracle.com>
d8079fe0 DW	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, xfs_agnumber_t agno,
	48	struct xfs_defer_ops *dfops);
1421de38	49	extern int xfs_refcountbt_maxrecs(int blocklen, bool leaf);
d8079fe0 DW	50	extern void xfs_refcountbt_compute_maxlevels(struct xfs_mount *mp);
d8079fe0 DW	51
02cc8b2a DW	52	extern xfs_extlen_t xfs_refcountbt_calc_size(struct xfs_mount *mp,
02cc8b2a DW	53	unsigned long long len);
f21c57ed DW	54	extern xfs_extlen_t xfs_refcountbt_max_size(struct xfs_mount *mp,
f21c57ed DW	55	xfs_agblock_t agblocks);
02cc8b2a DW	56
	57	extern int xfs_refcountbt_calc_reserves(struct xfs_mount *mp,
	58	xfs_agnumber_t agno, xfs_extlen_t ask, xfs_extlen_t used);
	59
d8079fe0	60	#endif /* __XFS_REFCOUNT_BTREE_H__ */