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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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1946b91cee
Start constructing the refcount btree implementation by establishing the on-disk format and everything needed to read, write, and manipulate the refcount btree blocks. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Christoph Hellwig <hch@lst.de>
68 lines
2.2 KiB
C
68 lines
2.2 KiB
C
/*
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* Copyright (C) 2016 Oracle. All Rights Reserved.
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*
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* Author: Darrick J. Wong <darrick.wong@oracle.com>
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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
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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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_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, xfs_agnumber_t agno,
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struct xfs_defer_ops *dfops);
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extern int xfs_refcountbt_maxrecs(struct xfs_mount *mp, int blocklen,
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bool leaf);
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extern void xfs_refcountbt_compute_maxlevels(struct xfs_mount *mp);
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#endif /* __XFS_REFCOUNT_BTREE_H__ */
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