xfs/libxfs/xfs_refcount_btree.h

0001 // SPDX-License-Identifier: GPL-2.0+
0002 /*
0003  * Copyright (C) 2016 Oracle.  All Rights Reserved.
0004  * Author: Darrick J. Wong <darrick.wong@oracle.com>
0005  */
0006 #ifndef __XFS_REFCOUNT_BTREE_H__
0007 #define __XFS_REFCOUNT_BTREE_H__
0008
0009 /*
0010  * Reference Count Btree on-disk structures
0011  */
0012
0013 struct xfs_buf;
0014 struct xfs_btree_cur;
0015 struct xfs_mount;
0016 struct xfs_perag;
0017 struct xbtree_afakeroot;
0018
0019 /*
0020  * Btree block header size
0021  */
0022 #define XFS_REFCOUNT_BLOCK_LEN  XFS_BTREE_SBLOCK_CRC_LEN
0023
0024 /*
0025  * Record, key, and pointer address macros for btree blocks.
0026  *
0027  * (note that some of these may appear unused, but they are used in userspace)
0028  */
0029 #define XFS_REFCOUNT_REC_ADDR(block, index) \
0030     ((struct xfs_refcount_rec *) \
0031         ((char *)(block) + \
0032          XFS_REFCOUNT_BLOCK_LEN + \
0033          (((index) - 1) * sizeof(struct xfs_refcount_rec))))
0034
0035 #define XFS_REFCOUNT_KEY_ADDR(block, index) \
0036     ((struct xfs_refcount_key *) \
0037         ((char *)(block) + \
0038          XFS_REFCOUNT_BLOCK_LEN + \
0039          ((index) - 1) * sizeof(struct xfs_refcount_key)))
0040
0041 #define XFS_REFCOUNT_PTR_ADDR(block, index, maxrecs) \
0042     ((xfs_refcount_ptr_t *) \
0043         ((char *)(block) + \
0044          XFS_REFCOUNT_BLOCK_LEN + \
0045          (maxrecs) * sizeof(struct xfs_refcount_key) + \
0046          ((index) - 1) * sizeof(xfs_refcount_ptr_t)))
0047
0048 extern struct xfs_btree_cur *xfs_refcountbt_init_cursor(struct xfs_mount *mp,
0049         struct xfs_trans *tp, struct xfs_buf *agbp,
0050         struct xfs_perag *pag);
0051 struct xfs_btree_cur *xfs_refcountbt_stage_cursor(struct xfs_mount *mp,
0052         struct xbtree_afakeroot *afake, struct xfs_perag *pag);
0053 extern int xfs_refcountbt_maxrecs(int blocklen, bool leaf);
0054 extern void xfs_refcountbt_compute_maxlevels(struct xfs_mount *mp);
0055
0056 extern xfs_extlen_t xfs_refcountbt_calc_size(struct xfs_mount *mp,
0057         unsigned long long len);
0058 extern xfs_extlen_t xfs_refcountbt_max_size(struct xfs_mount *mp,
0059         xfs_agblock_t agblocks);
0060
0061 extern int xfs_refcountbt_calc_reserves(struct xfs_mount *mp,
0062         struct xfs_trans *tp, struct xfs_perag *pag, xfs_extlen_t *ask,
0063         xfs_extlen_t *used);
0064
0065 void xfs_refcountbt_commit_staged_btree(struct xfs_btree_cur *cur,
0066         struct xfs_trans *tp, struct xfs_buf *agbp);
0067
0068 unsigned int xfs_refcountbt_maxlevels_ondisk(void);
0069
0070 int __init xfs_refcountbt_init_cur_cache(void);
0071 void xfs_refcountbt_destroy_cur_cache(void);
0072
0073 #endif  /* __XFS_REFCOUNT_BTREE_H__ */