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 xfs_perag; 17 struct xbtree_afakeroot; 18 19 /* 20 * Btree block header size 21 */ 22 #define XFS_REFCOUNT_BLOCK_LEN XFS_BTREE_SBLOCK_CRC_LEN 23 24 /* 25 * Record, key, and pointer address macros for btree blocks. 26 * 27 * (note that some of these may appear unused, but they are used in userspace) 28 */ 29 #define XFS_REFCOUNT_REC_ADDR(block, index) \ 30 ((struct xfs_refcount_rec *) \ 31 ((char *)(block) + \ 32 XFS_REFCOUNT_BLOCK_LEN + \ 33 (((index) - 1) * sizeof(struct xfs_refcount_rec)))) 34 35 #define XFS_REFCOUNT_KEY_ADDR(block, index) \ 36 ((struct xfs_refcount_key *) \ 37 ((char *)(block) + \ 38 XFS_REFCOUNT_BLOCK_LEN + \ 39 ((index) - 1) * sizeof(struct xfs_refcount_key))) 40 41 #define XFS_REFCOUNT_PTR_ADDR(block, index, maxrecs) \ 42 ((xfs_refcount_ptr_t *) \ 43 ((char *)(block) + \ 44 XFS_REFCOUNT_BLOCK_LEN + \ 45 (maxrecs) * sizeof(struct xfs_refcount_key) + \ 46 ((index) - 1) * sizeof(xfs_refcount_ptr_t))) 47 48 extern struct xfs_btree_cur *xfs_refcountbt_init_cursor(struct xfs_mount *mp, 49 struct xfs_trans *tp, struct xfs_buf *agbp, 50 struct xfs_perag *pag); 51 unsigned int xfs_refcountbt_maxrecs(struct xfs_mount *mp, unsigned int blocklen, 52 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, struct xfs_perag *pag, 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 unsigned int xfs_refcountbt_maxlevels_ondisk(void); 68 69 int __init xfs_refcountbt_init_cur_cache(void); 70 void xfs_refcountbt_destroy_cur_cache(void); 71 72 #endif /* __XFS_REFCOUNT_BTREE_H__ */ 73