xref: /openbmc/linux/fs/xfs/libxfs/xfs_alloc_btree.h (revision 9fa47bdc)
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 struct xfs_perag;
17 struct xbtree_afakeroot;
18 
19 /*
20  * Btree block header size depends on a superblock flag.
21  */
22 #define XFS_ALLOC_BLOCK_LEN(mp) \
23 	(xfs_has_crc(((mp))) ? \
24 		XFS_BTREE_SBLOCK_CRC_LEN : XFS_BTREE_SBLOCK_LEN)
25 
26 /*
27  * Record, key, and pointer address macros for btree blocks.
28  *
29  * (note that some of these may appear unused, but they are used in userspace)
30  */
31 #define XFS_ALLOC_REC_ADDR(mp, block, index) \
32 	((xfs_alloc_rec_t *) \
33 		((char *)(block) + \
34 		 XFS_ALLOC_BLOCK_LEN(mp) + \
35 		 (((index) - 1) * sizeof(xfs_alloc_rec_t))))
36 
37 #define XFS_ALLOC_KEY_ADDR(mp, block, index) \
38 	((xfs_alloc_key_t *) \
39 		((char *)(block) + \
40 		 XFS_ALLOC_BLOCK_LEN(mp) + \
41 		 ((index) - 1) * sizeof(xfs_alloc_key_t)))
42 
43 #define XFS_ALLOC_PTR_ADDR(mp, block, index, maxrecs) \
44 	((xfs_alloc_ptr_t *) \
45 		((char *)(block) + \
46 		 XFS_ALLOC_BLOCK_LEN(mp) + \
47 		 (maxrecs) * sizeof(xfs_alloc_key_t) + \
48 		 ((index) - 1) * sizeof(xfs_alloc_ptr_t)))
49 
50 extern struct xfs_btree_cur *xfs_allocbt_init_cursor(struct xfs_mount *mp,
51 		struct xfs_trans *tp, struct xfs_buf *bp,
52 		struct xfs_perag *pag, xfs_btnum_t btnum);
53 struct xfs_btree_cur *xfs_allocbt_stage_cursor(struct xfs_mount *mp,
54 		struct xbtree_afakeroot *afake, struct xfs_perag *pag,
55 		xfs_btnum_t btnum);
56 extern int xfs_allocbt_maxrecs(struct xfs_mount *, int, int);
57 extern xfs_extlen_t xfs_allocbt_calc_size(struct xfs_mount *mp,
58 		unsigned long long len);
59 
60 void xfs_allocbt_commit_staged_btree(struct xfs_btree_cur *cur,
61 		struct xfs_trans *tp, struct xfs_buf *agbp);
62 
63 unsigned int xfs_allocbt_maxlevels_ondisk(void);
64 
65 int __init xfs_allocbt_init_cur_cache(void);
66 void xfs_allocbt_destroy_cur_cache(void);
67 
68 #endif	/* __XFS_ALLOC_BTREE_H__ */
69