1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2016 Oracle. All Rights Reserved. 4 * Author: Darrick J. Wong <darrick.wong@oracle.com> 5 */ 6 #ifndef __XFS_REFCOUNT_BTREE_H__ 7 #define __XFS_REFCOUNT_BTREE_H__ 8 9 /* 10 * Reference Count Btree on-disk structures 11 */ 12 13 struct xfs_buf; 14 struct xfs_btree_cur; 15 struct xfs_mount; 16 struct xbtree_afakeroot; 17 18 /* 19 * Btree block header size 20 */ 21 #define XFS_REFCOUNT_BLOCK_LEN XFS_BTREE_SBLOCK_CRC_LEN 22 23 /* 24 * Record, key, and pointer address macros for btree blocks. 25 * 26 * (note that some of these may appear unused, but they are used in userspace) 27 */ 28 #define XFS_REFCOUNT_REC_ADDR(block, index) \ 29 ((struct xfs_refcount_rec *) \ 30 ((char *)(block) + \ 31 XFS_REFCOUNT_BLOCK_LEN + \ 32 (((index) - 1) * sizeof(struct xfs_refcount_rec)))) 33 34 #define XFS_REFCOUNT_KEY_ADDR(block, index) \ 35 ((struct xfs_refcount_key *) \ 36 ((char *)(block) + \ 37 XFS_REFCOUNT_BLOCK_LEN + \ 38 ((index) - 1) * sizeof(struct xfs_refcount_key))) 39 40 #define XFS_REFCOUNT_PTR_ADDR(block, index, maxrecs) \ 41 ((xfs_refcount_ptr_t *) \ 42 ((char *)(block) + \ 43 XFS_REFCOUNT_BLOCK_LEN + \ 44 (maxrecs) * sizeof(struct xfs_refcount_key) + \ 45 ((index) - 1) * sizeof(xfs_refcount_ptr_t))) 46 47 extern struct xfs_btree_cur *xfs_refcountbt_init_cursor(struct xfs_mount *mp, 48 struct xfs_trans *tp, struct xfs_buf *agbp, 49 xfs_agnumber_t agno); 50 struct xfs_btree_cur *xfs_refcountbt_stage_cursor(struct xfs_mount *mp, 51 struct xbtree_afakeroot *afake, xfs_agnumber_t agno); 52 extern int xfs_refcountbt_maxrecs(int blocklen, bool leaf); 53 extern void xfs_refcountbt_compute_maxlevels(struct xfs_mount *mp); 54 55 extern xfs_extlen_t xfs_refcountbt_calc_size(struct xfs_mount *mp, 56 unsigned long long len); 57 extern xfs_extlen_t xfs_refcountbt_max_size(struct xfs_mount *mp, 58 xfs_agblock_t agblocks); 59 60 extern int xfs_refcountbt_calc_reserves(struct xfs_mount *mp, 61 struct xfs_trans *tp, xfs_agnumber_t agno, xfs_extlen_t *ask, 62 xfs_extlen_t *used); 63 64 void xfs_refcountbt_commit_staged_btree(struct xfs_btree_cur *cur, 65 struct xfs_trans *tp, struct xfs_buf *agbp); 66 67 #endif /* __XFS_REFCOUNT_BTREE_H__ */ 68