linux/fs/xfs/libxfs/xfs_refcount_btree.h
Darrick J. Wong 9fa47bdcd3 xfs: use separate btree cursor cache for each btree type
Now that we have the infrastructure to track the max possible height of
each btree type, we can create a separate slab cache for cursors of each
type of btree.  For smaller indices like the free space btrees, this
means that we can pack more cursors into a slab page, improving slab
utilization.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
2021-10-19 11:45:16 -07:00

74 lines
2.2 KiB
C

// 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;
struct xfs_perag;
struct xbtree_afakeroot;
/*
* 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,
struct xfs_perag *pag);
struct xfs_btree_cur *xfs_refcountbt_stage_cursor(struct xfs_mount *mp,
struct xbtree_afakeroot *afake, struct xfs_perag *pag);
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,
struct xfs_trans *tp, struct xfs_perag *pag, xfs_extlen_t *ask,
xfs_extlen_t *used);
void xfs_refcountbt_commit_staged_btree(struct xfs_btree_cur *cur,
struct xfs_trans *tp, struct xfs_buf *agbp);
unsigned int xfs_refcountbt_maxlevels_ondisk(void);
int __init xfs_refcountbt_init_cur_cache(void);
void xfs_refcountbt_destroy_cur_cache(void);
#endif /* __XFS_REFCOUNT_BTREE_H__ */