Merge branch 'work.d_name' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[linux-2.6-microblaze.git] / fs / xfs / libxfs / xfs_rmap_btree.h
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
14 /* rmaps only exist on crc enabled filesystems */
15 #define XFS_RMAP_BLOCK_LEN      XFS_BTREE_SBLOCK_CRC_LEN
16
17 /*
18  * Record, key, and pointer address macros for btree blocks.
19  *
20  * (note that some of these may appear unused, but they are used in userspace)
21  */
22 #define XFS_RMAP_REC_ADDR(block, index) \
23         ((struct xfs_rmap_rec *) \
24                 ((char *)(block) + XFS_RMAP_BLOCK_LEN + \
25                  (((index) - 1) * sizeof(struct xfs_rmap_rec))))
26
27 #define XFS_RMAP_KEY_ADDR(block, index) \
28         ((struct xfs_rmap_key *) \
29                 ((char *)(block) + XFS_RMAP_BLOCK_LEN + \
30                  ((index) - 1) * 2 * sizeof(struct xfs_rmap_key)))
31
32 #define XFS_RMAP_HIGH_KEY_ADDR(block, index) \
33         ((struct xfs_rmap_key *) \
34                 ((char *)(block) + XFS_RMAP_BLOCK_LEN + \
35                  sizeof(struct xfs_rmap_key) + \
36                  ((index) - 1) * 2 * sizeof(struct xfs_rmap_key)))
37
38 #define XFS_RMAP_PTR_ADDR(block, index, maxrecs) \
39         ((xfs_rmap_ptr_t *) \
40                 ((char *)(block) + XFS_RMAP_BLOCK_LEN + \
41                  (maxrecs) * 2 * sizeof(struct xfs_rmap_key) + \
42                  ((index) - 1) * sizeof(xfs_rmap_ptr_t)))
43
44 struct xfs_btree_cur *xfs_rmapbt_init_cursor(struct xfs_mount *mp,
45                                 struct xfs_trans *tp, struct xfs_buf *bp,
46                                 xfs_agnumber_t agno);
47 struct xfs_btree_cur *xfs_rmapbt_stage_cursor(struct xfs_mount *mp,
48                 struct xbtree_afakeroot *afake, xfs_agnumber_t agno);
49 void xfs_rmapbt_commit_staged_btree(struct xfs_btree_cur *cur,
50                 struct xfs_trans *tp, struct xfs_buf *agbp);
51 int xfs_rmapbt_maxrecs(int blocklen, int 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                 xfs_agnumber_t agno, xfs_extlen_t *ask, xfs_extlen_t *used);
61
62 #endif  /* __XFS_RMAP_BTREE_H__ */