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 #define XFS_IBT_CRC_MAGIC 0x49414233 /* 'IAB3' */
34
35 typedef __uint64_t xfs_inofree_t;
36 #define XFS_INODES_PER_CHUNK (NBBY * sizeof(xfs_inofree_t))
37 #define XFS_INODES_PER_CHUNK_LOG (XFS_NBBYLOG + 3)
38 #define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1)
39 #define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i))
40
xfs_inobt_maskn(int i,int n)41 static inline xfs_inofree_t xfs_inobt_maskn(int i, int n)
42 {
43 return ((n >= XFS_INODES_PER_CHUNK ? 0 : XFS_INOBT_MASK(n)) - 1) << i;
44 }
45
46 /*
47 * Data record structure
48 */
49 typedef struct xfs_inobt_rec {
50 __be32 ir_startino; /* starting inode number */
51 __be32 ir_freecount; /* count of free inodes (set bits) */
52 __be64 ir_free; /* free inode mask */
53 } xfs_inobt_rec_t;
54
55 typedef struct xfs_inobt_rec_incore {
56 xfs_agino_t ir_startino; /* starting inode number */
57 __int32_t ir_freecount; /* count of free inodes (set bits) */
58 xfs_inofree_t ir_free; /* free inode mask */
59 } xfs_inobt_rec_incore_t;
60
61
62 /*
63 * Key structure
64 */
65 typedef struct xfs_inobt_key {
66 __be32 ir_startino; /* starting inode number */
67 } xfs_inobt_key_t;
68
69 /* btree pointer type */
70 typedef __be32 xfs_inobt_ptr_t;
71
72 /*
73 * block numbers in the AG.
74 */
75 #define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1))
76 #define XFS_PREALLOC_BLOCKS(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1))
77
78 /*
79 * Btree block header size depends on a superblock flag.
80 */
81 #define XFS_INOBT_BLOCK_LEN(mp) \
82 (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
83 XFS_BTREE_SBLOCK_CRC_LEN : XFS_BTREE_SBLOCK_LEN)
84
85 /*
86 * Record, key, and pointer address macros for btree blocks.
87 *
88 * (note that some of these may appear unused, but they are used in userspace)
89 */
90 #define XFS_INOBT_REC_ADDR(mp, block, index) \
91 ((xfs_inobt_rec_t *) \
92 ((char *)(block) + \
93 XFS_INOBT_BLOCK_LEN(mp) + \
94 (((index) - 1) * sizeof(xfs_inobt_rec_t))))
95
96 #define XFS_INOBT_KEY_ADDR(mp, block, index) \
97 ((xfs_inobt_key_t *) \
98 ((char *)(block) + \
99 XFS_INOBT_BLOCK_LEN(mp) + \
100 ((index) - 1) * sizeof(xfs_inobt_key_t)))
101
102 #define XFS_INOBT_PTR_ADDR(mp, block, index, maxrecs) \
103 ((xfs_inobt_ptr_t *) \
104 ((char *)(block) + \
105 XFS_INOBT_BLOCK_LEN(mp) + \
106 (maxrecs) * sizeof(xfs_inobt_key_t) + \
107 ((index) - 1) * sizeof(xfs_inobt_ptr_t)))
108
109 extern struct xfs_btree_cur *xfs_inobt_init_cursor(struct xfs_mount *,
110 struct xfs_trans *, struct xfs_buf *, xfs_agnumber_t);
111 extern int xfs_inobt_maxrecs(struct xfs_mount *, int, int);
112
113 extern const struct xfs_buf_ops xfs_inobt_buf_ops;
114
115 #endif /* __XFS_IALLOC_BTREE_H__ */
116