2 * Copyright (c) 2000,2005 Silicon Graphics, Inc.
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.
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.
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
18 #ifndef __XFS_IALLOC_BTREE_H__
19 #define __XFS_IALLOC_BTREE_H__
22 * Inode map on-disk structures
27 struct xfs_btree_sblock;
31 * There is a btree for the inode map per allocation group.
33 #define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */
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)
40 #define XFS_INOBT_MASKN(i,n) xfs_inobt_maskn(i,n)
41 static inline xfs_inofree_t xfs_inobt_maskn(int i, int n)
43 return (((n) >= XFS_INODES_PER_CHUNK ? \
44 (xfs_inofree_t)0 : ((xfs_inofree_t)1 << (n))) - 1) << (i);
48 * Data record structure
50 typedef struct xfs_inobt_rec {
51 __be32 ir_startino; /* starting inode number */
52 __be32 ir_freecount; /* count of free inodes (set bits) */
53 __be64 ir_free; /* free inode mask */
56 typedef struct xfs_inobt_rec_incore {
57 xfs_agino_t ir_startino; /* starting inode number */
58 __int32_t ir_freecount; /* count of free inodes (set bits) */
59 xfs_inofree_t ir_free; /* free inode mask */
60 } xfs_inobt_rec_incore_t;
66 typedef struct xfs_inobt_key {
67 __be32 ir_startino; /* starting inode number */
70 /* btree pointer type */
71 typedef __be32 xfs_inobt_ptr_t;
73 /* btree block header type */
74 typedef struct xfs_btree_sblock xfs_inobt_block_t;
76 #define XFS_BUF_TO_INOBT_BLOCK(bp) ((xfs_inobt_block_t *)XFS_BUF_PTR(bp))
79 * Bit manipulations for ir_free.
81 #define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i))
82 #define XFS_INOBT_IS_FREE(rp,i) \
83 (((rp)->ir_free & XFS_INOBT_MASK(i)) != 0)
84 #define XFS_INOBT_SET_FREE(rp,i) ((rp)->ir_free |= XFS_INOBT_MASK(i))
85 #define XFS_INOBT_CLR_FREE(rp,i) ((rp)->ir_free &= ~XFS_INOBT_MASK(i))
88 * Maximum number of inode btree levels.
90 #define XFS_IN_MAXLEVELS(mp) ((mp)->m_in_maxlevels)
93 * block numbers in the AG.
95 #define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1))
96 #define XFS_PREALLOC_BLOCKS(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1))
99 * Record, key, and pointer address macros for btree blocks.
101 * (note that some of these may appear unused, but they are used in userspace)
103 #define XFS_INOBT_REC_ADDR(mp, block, index) \
104 ((xfs_inobt_rec_t *) \
106 sizeof(struct xfs_btree_sblock) + \
107 (((index) - 1) * sizeof(xfs_inobt_rec_t))))
109 #define XFS_INOBT_KEY_ADDR(mp, block, index) \
110 ((xfs_inobt_key_t *) \
112 sizeof(struct xfs_btree_sblock) + \
113 ((index) - 1) * sizeof(xfs_inobt_key_t)))
115 #define XFS_INOBT_PTR_ADDR(mp, block, index, maxrecs) \
116 ((xfs_inobt_ptr_t *) \
118 sizeof(struct xfs_btree_sblock) + \
119 (maxrecs) * sizeof(xfs_inobt_key_t) + \
120 ((index) - 1) * sizeof(xfs_inobt_ptr_t)))
122 extern struct xfs_btree_cur *xfs_inobt_init_cursor(struct xfs_mount *,
123 struct xfs_trans *, struct xfs_buf *, xfs_agnumber_t);
124 extern int xfs_inobt_maxrecs(struct xfs_mount *, int, int);
126 #endif /* __XFS_IALLOC_BTREE_H__ */