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 struct xbtree_afakeroot; 13 struct xfbtree; 14 15 /* rmaps only exist on crc enabled filesystems */ 16 #define XFS_RMAP_BLOCK_LEN XFS_BTREE_SBLOCK_CRC_LEN 17 18 /* 19 * Record, key, and pointer address macros for btree blocks. 20 * 21 * (note that some of these may appear unused, but they are used in userspace) 22 */ 23 #define XFS_RMAP_REC_ADDR(block, index) \ 24 ((struct xfs_rmap_rec *) \ 25 ((char *)(block) + XFS_RMAP_BLOCK_LEN + \ 26 (((index) - 1) * sizeof(struct xfs_rmap_rec)))) 27 28 #define XFS_RMAP_KEY_ADDR(block, index) \ 29 ((struct xfs_rmap_key *) \ 30 ((char *)(block) + XFS_RMAP_BLOCK_LEN + \ 31 ((index) - 1) * 2 * sizeof(struct xfs_rmap_key))) 32 33 #define XFS_RMAP_HIGH_KEY_ADDR(block, index) \ 34 ((struct xfs_rmap_key *) \ 35 ((char *)(block) + XFS_RMAP_BLOCK_LEN + \ 36 sizeof(struct xfs_rmap_key) + \ 37 ((index) - 1) * 2 * sizeof(struct xfs_rmap_key))) 38 39 #define XFS_RMAP_PTR_ADDR(block, index, maxrecs) \ 40 ((xfs_rmap_ptr_t *) \ 41 ((char *)(block) + XFS_RMAP_BLOCK_LEN + \ 42 (maxrecs) * 2 * sizeof(struct xfs_rmap_key) + \ 43 ((index) - 1) * sizeof(xfs_rmap_ptr_t))) 44 45 struct xfs_btree_cur *xfs_rmapbt_init_cursor(struct xfs_mount *mp, 46 struct xfs_trans *tp, struct xfs_buf *bp, 47 struct xfs_perag *pag); 48 void xfs_rmapbt_commit_staged_btree(struct xfs_btree_cur *cur, 49 struct xfs_trans *tp, struct xfs_buf *agbp); 50 unsigned int xfs_rmapbt_maxrecs(struct xfs_mount *mp, unsigned int blocklen, 51 bool leaf); 52 extern void xfs_rmapbt_compute_maxlevels(struct xfs_mount *mp); 53 54 extern xfs_extlen_t xfs_rmapbt_calc_size(struct xfs_mount *mp, 55 unsigned long long len); 56 extern xfs_extlen_t xfs_rmapbt_max_size(struct xfs_mount *mp, 57 xfs_agblock_t agblocks); 58 59 extern int xfs_rmapbt_calc_reserves(struct xfs_mount *mp, struct xfs_trans *tp, 60 struct xfs_perag *pag, xfs_extlen_t *ask, xfs_extlen_t *used); 61 62 unsigned int xfs_rmapbt_maxlevels_ondisk(void); 63 64 int __init xfs_rmapbt_init_cur_cache(void); 65 void xfs_rmapbt_destroy_cur_cache(void); 66 67 struct xfs_btree_cur *xfs_rmapbt_mem_cursor(struct xfs_perag *pag, 68 struct xfs_trans *tp, struct xfbtree *xfbtree); 69 int xfs_rmapbt_mem_init(struct xfs_mount *mp, struct xfbtree *xfbtree, 70 struct xfs_buftarg *btp, xfs_agnumber_t agno); 71 72 #endif /* __XFS_RMAP_BTREE_H__ */ 73