mirror of https://gitee.com/openkylin/linux.git
61 lines
1.8 KiB
C
61 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2016 Oracle. All Rights Reserved.
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* Author: Darrick J. Wong <darrick.wong@oracle.com>
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*/
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#ifndef __XFS_REFCOUNT_BTREE_H__
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#define __XFS_REFCOUNT_BTREE_H__
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/*
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* Reference Count Btree on-disk structures
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*/
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struct xfs_buf;
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struct xfs_btree_cur;
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struct xfs_mount;
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/*
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* Btree block header size
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*/
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#define XFS_REFCOUNT_BLOCK_LEN XFS_BTREE_SBLOCK_CRC_LEN
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/*
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* Record, key, and pointer address macros for btree blocks.
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*
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* (note that some of these may appear unused, but they are used in userspace)
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*/
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#define XFS_REFCOUNT_REC_ADDR(block, index) \
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((struct xfs_refcount_rec *) \
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((char *)(block) + \
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XFS_REFCOUNT_BLOCK_LEN + \
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(((index) - 1) * sizeof(struct xfs_refcount_rec))))
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#define XFS_REFCOUNT_KEY_ADDR(block, index) \
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((struct xfs_refcount_key *) \
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((char *)(block) + \
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XFS_REFCOUNT_BLOCK_LEN + \
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((index) - 1) * sizeof(struct xfs_refcount_key)))
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#define XFS_REFCOUNT_PTR_ADDR(block, index, maxrecs) \
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((xfs_refcount_ptr_t *) \
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((char *)(block) + \
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XFS_REFCOUNT_BLOCK_LEN + \
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(maxrecs) * sizeof(struct xfs_refcount_key) + \
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((index) - 1) * sizeof(xfs_refcount_ptr_t)))
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extern struct xfs_btree_cur *xfs_refcountbt_init_cursor(struct xfs_mount *mp,
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struct xfs_trans *tp, struct xfs_buf *agbp,
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xfs_agnumber_t agno);
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extern int xfs_refcountbt_maxrecs(int blocklen, bool leaf);
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extern void xfs_refcountbt_compute_maxlevels(struct xfs_mount *mp);
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extern xfs_extlen_t xfs_refcountbt_calc_size(struct xfs_mount *mp,
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unsigned long long len);
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extern xfs_extlen_t xfs_refcountbt_max_size(struct xfs_mount *mp,
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xfs_agblock_t agblocks);
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extern int xfs_refcountbt_calc_reserves(struct xfs_mount *mp,
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xfs_agnumber_t agno, xfs_extlen_t *ask, xfs_extlen_t *used);
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#endif /* __XFS_REFCOUNT_BTREE_H__ */
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