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1 | /* | |
2 | * Copyright (c) 2000,2005 Silicon Graphics, Inc. | |
3 | * All Rights Reserved. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public License as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it would be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
17 | */ | |
18 | #ifndef __XFS_IALLOC_BTREE_H__ | |
19 | #define __XFS_IALLOC_BTREE_H__ | |
20 | ||
21 | /* | |
22 | * Inode map on-disk structures | |
23 | */ | |
24 | ||
25 | struct xfs_buf; | |
26 | struct xfs_btree_cur; | |
27 | struct xfs_mount; | |
28 | ||
29 | /* | |
30 | * Btree block header size depends on a superblock flag. | |
31 | */ | |
32 | #define XFS_INOBT_BLOCK_LEN(mp) \ | |
33 | (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \ | |
34 | XFS_BTREE_SBLOCK_CRC_LEN : XFS_BTREE_SBLOCK_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_INOBT_REC_ADDR(mp, block, index) \ | |
42 | ((xfs_inobt_rec_t *) \ | |
43 | ((char *)(block) + \ | |
44 | XFS_INOBT_BLOCK_LEN(mp) + \ | |
45 | (((index) - 1) * sizeof(xfs_inobt_rec_t)))) | |
46 | ||
47 | #define XFS_INOBT_KEY_ADDR(mp, block, index) \ | |
48 | ((xfs_inobt_key_t *) \ | |
49 | ((char *)(block) + \ | |
50 | XFS_INOBT_BLOCK_LEN(mp) + \ | |
51 | ((index) - 1) * sizeof(xfs_inobt_key_t))) | |
52 | ||
53 | #define XFS_INOBT_PTR_ADDR(mp, block, index, maxrecs) \ | |
54 | ((xfs_inobt_ptr_t *) \ | |
55 | ((char *)(block) + \ | |
56 | XFS_INOBT_BLOCK_LEN(mp) + \ | |
57 | (maxrecs) * sizeof(xfs_inobt_key_t) + \ | |
58 | ((index) - 1) * sizeof(xfs_inobt_ptr_t))) | |
59 | ||
60 | extern struct xfs_btree_cur *xfs_inobt_init_cursor(struct xfs_mount *, | |
61 | struct xfs_trans *, struct xfs_buf *, xfs_agnumber_t); | |
62 | extern int xfs_inobt_maxrecs(struct xfs_mount *, int, int); | |
63 | ||
64 | #endif /* __XFS_IALLOC_BTREE_H__ */ |