tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/*
2 * Copyright (C) 2016 Oracle. All Rights Reserved.
3 *
4 * Author: Darrick J. Wong <darrick.wong@oracle.com>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it would be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
19 */
20#ifndef __XFS_REFCOUNT_BTREE_H__
21#define __XFS_REFCOUNT_BTREE_H__
22
23/*
24 * Reference Count Btree on-disk structures
25 */
26
27struct xfs_buf;
28struct xfs_btree_cur;
29struct xfs_mount;
30
31/*
32 * Btree block header size
33 */
34#define XFS_REFCOUNT_BLOCK_LEN XFS_BTREE_SBLOCK_CRC_LEN
35
36/*
37 * Record, key, and pointer address macros for btree blocks.
38 *
39 * (note that some of these may appear unused, but they are used in userspace)
40 */
41#define XFS_REFCOUNT_REC_ADDR(block, index) \
42 ((struct xfs_refcount_rec *) \
43 ((char *)(block) + \
44 XFS_REFCOUNT_BLOCK_LEN + \
45 (((index) - 1) * sizeof(struct xfs_refcount_rec))))
46
47#define XFS_REFCOUNT_KEY_ADDR(block, index) \
48 ((struct xfs_refcount_key *) \
49 ((char *)(block) + \
50 XFS_REFCOUNT_BLOCK_LEN + \
51 ((index) - 1) * sizeof(struct xfs_refcount_key)))
52
53#define XFS_REFCOUNT_PTR_ADDR(block, index, maxrecs) \
54 ((xfs_refcount_ptr_t *) \
55 ((char *)(block) + \
56 XFS_REFCOUNT_BLOCK_LEN + \
57 (maxrecs) * sizeof(struct xfs_refcount_key) + \
58 ((index) - 1) * sizeof(xfs_refcount_ptr_t)))
59
60extern struct xfs_btree_cur *xfs_refcountbt_init_cursor(struct xfs_mount *mp,
61 struct xfs_trans *tp, struct xfs_buf *agbp, xfs_agnumber_t agno,
62 struct xfs_defer_ops *dfops);
63extern int xfs_refcountbt_maxrecs(struct xfs_mount *mp, int blocklen,
64 bool leaf);
65extern void xfs_refcountbt_compute_maxlevels(struct xfs_mount *mp);
66
67extern xfs_extlen_t xfs_refcountbt_calc_size(struct xfs_mount *mp,
68 unsigned long long len);
69extern xfs_extlen_t xfs_refcountbt_max_size(struct xfs_mount *mp);
70
71extern int xfs_refcountbt_calc_reserves(struct xfs_mount *mp,
72 xfs_agnumber_t agno, xfs_extlen_t *ask, xfs_extlen_t *used);
73
74#endif /* __XFS_REFCOUNT_BTREE_H__ */