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0ed5f7356d
Add code for all five btree types so that we can compute the absolute maximum possible btree height for each btree type. This is a setup for the next patch, which makes every btree type have its own cursor cache. The functions are exported so that we can have xfs_db report the absolute maximum btree heights for each btree type, rather than making everyone run their own ad-hoc computations. Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Dave Chinner <dchinner@redhat.com>
66 lines
1.8 KiB
C
66 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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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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#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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struct xfs_perag;
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struct xbtree_afakeroot;
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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_has_crc(((mp))) ? \
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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 *mp,
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struct xfs_trans *tp, struct xfs_buf *bp,
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struct xfs_perag *pag, xfs_btnum_t btnum);
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struct xfs_btree_cur *xfs_allocbt_stage_cursor(struct xfs_mount *mp,
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struct xbtree_afakeroot *afake, struct xfs_perag *pag,
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xfs_btnum_t btnum);
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extern int xfs_allocbt_maxrecs(struct xfs_mount *, int, int);
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extern xfs_extlen_t xfs_allocbt_calc_size(struct xfs_mount *mp,
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unsigned long long len);
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void xfs_allocbt_commit_staged_btree(struct xfs_btree_cur *cur,
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struct xfs_trans *tp, struct xfs_buf *agbp);
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unsigned int xfs_allocbt_maxlevels_ondisk(void);
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#endif /* __XFS_ALLOC_BTREE_H__ */
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