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 * There is a btree for the inode map per allocation group.
31 */
32 #define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */
33
34 typedef __uint64_t xfs_inofree_t;
35 #define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t))
36 #define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3)
37 #define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1)
38 #define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i))
39
40 static inline xfs_inofree_t xfs_inobt_maskn(int i, int n)
41 {
42 return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i;
43 }
44
45 /*
46 * Data record structure
47 */
48 typedef struct xfs_inobt_rec {
49 __be32 ir_startino; /* starting inode number */
50 __be32 ir_freecount; /* count of free inodes (set bits) */
51 __be64 ir_free; /* free inode mask */
52 } xfs_inobt_rec_t;
53
54 typedef struct xfs_inobt_rec_incore {
55 xfs_agino_t ir_startino; /* starting inode number */
56 __int32_t ir_freecount; /* count of free inodes (set bits) */
57 xfs_inofree_t ir_free; /* free inode mask */
58 } xfs_inobt_rec_incore_t;
59
60
61 /*
62 * Key structure
63 */
64 typedef struct xfs_inobt_key {
65 __be32 ir_startino; /* starting inode number */
66 } xfs_inobt_key_t;
67
68 /* btree pointer type */
69 typedef __be32 xfs_inobt_ptr_t;
70
71 /*
72 * block numbers in the AG.
73 */
74 #define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1))
75 #define XFS_PREALLOC_BLOCKS(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1))
76
77 /*
78 * Btree block header size depends on a superblock flag.
79 *
80 * (not quite yet, but soon)
81 */
82 #define XFS_INOBT_BLOCK_LEN(mp) XFS_BTREE_SBLOCK_LEN
83
84 /*
85 * Record, key, and pointer address macros for btree blocks.
86 *
87 * (note that some of these may appear unused, but they are used in userspace)
88 */
89 #define XFS_INOBT_REC_ADDR(mp, block, index) \
90 ((xfs_inobt_rec_t *) \
91 ((char *)(block) + \
92 XFS_INOBT_BLOCK_LEN(mp) + \
93 (((index) - 1) * sizeof(xfs_inobt_rec_t))))
94
95 #define XFS_INOBT_KEY_ADDR(mp, block, index) \
96 ((xfs_inobt_key_t *) \
97 ((char *)(block) + \
98 XFS_INOBT_BLOCK_LEN(mp) + \
99 ((index) - 1) * sizeof(xfs_inobt_key_t)))
100
101 #define XFS_INOBT_PTR_ADDR(mp, block, index, maxrecs) \
102 ((xfs_inobt_ptr_t *) \
103 ((char *)(block) + \
104 XFS_INOBT_BLOCK_LEN(mp) + \
105 (maxrecs) * sizeof(xfs_inobt_key_t) + \
106 ((index) - 1) * sizeof(xfs_inobt_ptr_t)))
107
108 extern struct xfs_btree_cur *xfs_inobt_init_cursor(struct xfs_mount *,
109 struct xfs_trans *, struct xfs_buf *, xfs_agnumber_t);
110 extern int xfs_inobt_maxrecs(struct xfs_mount *, int, int);
111
112 #endif /* __XFS_IALLOC_BTREE_H__ */
113
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