1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2000,2005 Silicon Graphics, Inc. 4 * All Rights Reserved. 5 */ 6 #ifndef __XFS_ALLOC_BTREE_H__ 7 #define __XFS_ALLOC_BTREE_H__ 8 9 /* 10 * Freespace on-disk structures 11 */ 12 13 struct xfs_buf; 14 struct xfs_btree_cur; 15 struct xfs_mount; 16 17 /* 18 * Btree block header size depends on a superblock flag. 19 */ 20 #define XFS_ALLOC_BLOCK_LEN(mp) \ 21 (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \ 22 XFS_BTREE_SBLOCK_CRC_LEN : XFS_BTREE_SBLOCK_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_ALLOC_REC_ADDR(mp, block, index) \ 30 ((xfs_alloc_rec_t *) \ 31 ((char *)(block) + \ 32 XFS_ALLOC_BLOCK_LEN(mp) + \ 33 (((index) - 1) * sizeof(xfs_alloc_rec_t)))) 34 35 #define XFS_ALLOC_KEY_ADDR(mp, block, index) \ 36 ((xfs_alloc_key_t *) \ 37 ((char *)(block) + \ 38 XFS_ALLOC_BLOCK_LEN(mp) + \ 39 ((index) - 1) * sizeof(xfs_alloc_key_t))) 40 41 #define XFS_ALLOC_PTR_ADDR(mp, block, index, maxrecs) \ 42 ((xfs_alloc_ptr_t *) \ 43 ((char *)(block) + \ 44 XFS_ALLOC_BLOCK_LEN(mp) + \ 45 (maxrecs) * sizeof(xfs_alloc_key_t) + \ 46 ((index) - 1) * sizeof(xfs_alloc_ptr_t))) 47 48 extern struct xfs_btree_cur *xfs_allocbt_init_cursor(struct xfs_mount *, 49 struct xfs_trans *, struct xfs_buf *, 50 xfs_agnumber_t, xfs_btnum_t); 51 extern int xfs_allocbt_maxrecs(struct xfs_mount *, int, int); 52 extern xfs_extlen_t xfs_allocbt_calc_size(struct xfs_mount *mp, 53 unsigned long long len); 54 55 #endif /* __XFS_ALLOC_BTREE_H__ */ 56