1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2014 Red Hat, Inc. 4 * All Rights Reserved. 5 */ 6 #ifndef __XFS_RMAP_BTREE_H__ 7 #define __XFS_RMAP_BTREE_H__ 8 9 struct xfs_buf; 10 struct xfs_btree_cur; 11 struct xfs_mount; 12 13 /* rmaps only exist on crc enabled filesystems */ 14 #define XFS_RMAP_BLOCK_LEN XFS_BTREE_SBLOCK_CRC_LEN 15 16 /* 17 * Record, key, and pointer address macros for btree blocks. 18 * 19 * (note that some of these may appear unused, but they are used in userspace) 20 */ 21 #define XFS_RMAP_REC_ADDR(block, index) \ 22 ((struct xfs_rmap_rec *) \ 23 ((char *)(block) + XFS_RMAP_BLOCK_LEN + \ 24 (((index) - 1) * sizeof(struct xfs_rmap_rec)))) 25 26 #define XFS_RMAP_KEY_ADDR(block, index) \ 27 ((struct xfs_rmap_key *) \ 28 ((char *)(block) + XFS_RMAP_BLOCK_LEN + \ 29 ((index) - 1) * 2 * sizeof(struct xfs_rmap_key))) 30 31 #define XFS_RMAP_HIGH_KEY_ADDR(block, index) \ 32 ((struct xfs_rmap_key *) \ 33 ((char *)(block) + XFS_RMAP_BLOCK_LEN + \ 34 sizeof(struct xfs_rmap_key) + \ 35 ((index) - 1) * 2 * sizeof(struct xfs_rmap_key))) 36 37 #define XFS_RMAP_PTR_ADDR(block, index, maxrecs) \ 38 ((xfs_rmap_ptr_t *) \ 39 ((char *)(block) + XFS_RMAP_BLOCK_LEN + \ 40 (maxrecs) * 2 * sizeof(struct xfs_rmap_key) + \ 41 ((index) - 1) * sizeof(xfs_rmap_ptr_t))) 42 43 struct xfs_btree_cur *xfs_rmapbt_init_cursor(struct xfs_mount *mp, 44 struct xfs_trans *tp, struct xfs_buf *bp, 45 xfs_agnumber_t agno); 46 int xfs_rmapbt_maxrecs(int blocklen, int leaf); 47 extern void xfs_rmapbt_compute_maxlevels(struct xfs_mount *mp); 48 49 extern xfs_extlen_t xfs_rmapbt_calc_size(struct xfs_mount *mp, 50 unsigned long long len); 51 extern xfs_extlen_t xfs_rmapbt_max_size(struct xfs_mount *mp, 52 xfs_agblock_t agblocks); 53 54 extern int xfs_rmapbt_calc_reserves(struct xfs_mount *mp, 55 xfs_agnumber_t agno, xfs_extlen_t *ask, xfs_extlen_t *used); 56 57 #endif /* __XFS_RMAP_BTREE_H__ */ 58