mirror of https://gitee.com/openkylin/linux.git
66 lines
2.0 KiB
C
66 lines
2.0 KiB
C
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/*
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* Copyright (c) 2000,2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __XFS_ALLOC_BTREE_H__
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#define __XFS_ALLOC_BTREE_H__
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/*
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* Freespace 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 depends on a superblock flag.
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*/
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#define XFS_ALLOC_BLOCK_LEN(mp) \
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(xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
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XFS_BTREE_SBLOCK_CRC_LEN : XFS_BTREE_SBLOCK_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_ALLOC_REC_ADDR(mp, block, index) \
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((xfs_alloc_rec_t *) \
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((char *)(block) + \
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XFS_ALLOC_BLOCK_LEN(mp) + \
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(((index) - 1) * sizeof(xfs_alloc_rec_t))))
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#define XFS_ALLOC_KEY_ADDR(mp, block, index) \
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((xfs_alloc_key_t *) \
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((char *)(block) + \
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XFS_ALLOC_BLOCK_LEN(mp) + \
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((index) - 1) * sizeof(xfs_alloc_key_t)))
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#define XFS_ALLOC_PTR_ADDR(mp, block, index, maxrecs) \
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((xfs_alloc_ptr_t *) \
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((char *)(block) + \
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XFS_ALLOC_BLOCK_LEN(mp) + \
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(maxrecs) * sizeof(xfs_alloc_key_t) + \
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((index) - 1) * sizeof(xfs_alloc_ptr_t)))
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extern struct xfs_btree_cur *xfs_allocbt_init_cursor(struct xfs_mount *,
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struct xfs_trans *, struct xfs_buf *,
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xfs_agnumber_t, xfs_btnum_t);
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extern int xfs_allocbt_maxrecs(struct xfs_mount *, int, int);
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#endif /* __XFS_ALLOC_BTREE_H__ */
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