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, struct xfs_trans *tp,
55 		xfs_agnumber_t agno, xfs_extlen_t *ask, xfs_extlen_t *used);
56 
57 #endif	/* __XFS_RMAP_BTREE_H__ */
58