aboutsummaryrefslogtreecommitdiffstats
path: root/fs/xfs/xfs_ialloc_btree.h
blob: 86ed749d4cc1e487005f40b7a5b5802316619a8a (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
/*
 * Copyright (c) 2000,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef __XFS_IALLOC_BTREE_H__
#define	__XFS_IALLOC_BTREE_H__

/*
 * Inode map on-disk structures
 */

struct xfs_buf;
struct xfs_btree_cur;
struct xfs_btree_sblock;
struct xfs_mount;

/*
 * There is a btree for the inode map per allocation group.
 */
#define	XFS_IBT_MAGIC	0x49414254	/* 'IABT' */

typedef	__uint64_t	xfs_inofree_t;
#define	XFS_INODES_PER_CHUNK	(NBBY * sizeof(xfs_inofree_t))
#define	XFS_INODES_PER_CHUNK_LOG	(XFS_NBBYLOG + 3)
#define	XFS_INOBT_ALL_FREE	((xfs_inofree_t)-1)

#define	XFS_INOBT_MASKN(i,n)		xfs_inobt_maskn(i,n)
static inline xfs_inofree_t xfs_inobt_maskn(int i, int n)
{
	return (((n) >= XFS_INODES_PER_CHUNK ? \
		(xfs_inofree_t)0 : ((xfs_inofree_t)1 << (n))) - 1) << (i);
}

/*
 * Data record structure
 */
typedef struct xfs_inobt_rec
{
	xfs_agino_t	ir_startino;	/* starting inode number */
	__int32_t	ir_freecount;	/* count of free inodes (set bits) */
	xfs_inofree_t	ir_free;	/* free inode mask */
} xfs_inobt_rec_t;

/*
 * Key structure
 */
typedef struct xfs_inobt_key
{
	xfs_agino_t	ir_startino;	/* starting inode number */
} xfs_inobt_key_t;

typedef xfs_agblock_t xfs_inobt_ptr_t;	/* btree pointer type */
					/* btree block header type */
typedef	struct xfs_btree_sblock xfs_inobt_block_t;

#define	XFS_BUF_TO_INOBT_BLOCK(bp)	((xfs_inobt_block_t *)XFS_BUF_PTR(bp))

/*
 * Bit manipulations for ir_free.
 */
#define	XFS_INOBT_MASK(i)		((xfs_inofree_t)1 << (i))
#define	XFS_INOBT_IS_FREE(rp,i)		\
		(((rp)->ir_free & XFS_INOBT_MASK(i)) != 0)
#define	XFS_INOBT_IS_FREE_DISK(rp,i)	\
		((INT_GET((rp)->ir_free,ARCH_CONVERT) & XFS_INOBT_MASK(i)) != 0)
#define	XFS_INOBT_SET_FREE(rp,i)	((rp)->ir_free |= XFS_INOBT_MASK(i))
#define	XFS_INOBT_CLR_FREE(rp,i)	((rp)->ir_free &= ~XFS_INOBT_MASK(i))

/*
 * Real block structures have a size equal to the disk block size.
 */
#define	XFS_INOBT_BLOCK_SIZE(lev,cur)	(1 << (cur)->bc_blocklog)
#define	XFS_INOBT_BLOCK_MAXRECS(lev,cur) ((cur)->bc_mp->m_inobt_mxr[lev != 0])
#define	XFS_INOBT_BLOCK_MINRECS(lev,cur) ((cur)->bc_mp->m_inobt_mnr[lev != 0])
#define	XFS_INOBT_IS_LAST_REC(cur)	\
	((cur)->bc_ptrs[0] == INT_GET(XFS_BUF_TO_INOBT_BLOCK((cur)->bc_bufs[0])->bb_numrecs, ARCH_CONVERT))

/*
 * Maximum number of inode btree levels.
 */
#define	XFS_IN_MAXLEVELS(mp)		((mp)->m_in_maxlevels)

/*
 * block numbers in the AG.
 */
#define	XFS_IBT_BLOCK(mp)		((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1))
#define	XFS_PREALLOC_BLOCKS(mp)		((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1))

/*
 * Record, key, and pointer address macros for btree blocks.
 */
#define XFS_INOBT_REC_ADDR(bb,i,cur) \
	(XFS_BTREE_REC_ADDR(XFS_INOBT_BLOCK_SIZE(0,cur), xfs_inobt, bb, \
				i, XFS_INOBT_BLOCK_MAXRECS(0, cur)))
#define	XFS_INOBT_KEY_ADDR(bb,i,cur) \
	(XFS_BTREE_KEY_ADDR(XFS_INOBT_BLOCK_SIZE(1,cur), xfs_inobt, bb, \
				i, XFS_INOBT_BLOCK_MAXRECS(1, cur)))

#define	XFS_INOBT_PTR_ADDR(bb,i,cur) \
	(XFS_BTREE_PTR_ADDR(XFS_INOBT_BLOCK_SIZE(1,cur), xfs_inobt, bb, \
				i, XFS_INOBT_BLOCK_MAXRECS(1, cur)))

/*
 * Decrement cursor by one record at the level.
 * For nonzero levels the leaf-ward information is untouched.
 */
extern int xfs_inobt_decrement(struct xfs_btree_cur *cur, int level, int *stat);

/*
 * Delete the record pointed to by cur.
 * The cursor refers to the place where the record was (could be inserted)
 * when the operation returns.
 */
extern int xfs_inobt_delete(struct xfs_btree_cur *cur, int *stat);

/*
 * Get the data from the pointed-to record.
 */
extern int xfs_inobt_get_rec(struct xfs_btree_cur *cur, xfs_agino_t *ino,
			     __int32_t *fcnt, xfs_inofree_t *free, int *stat);

/*
 * Increment cursor by one record at the level.
 * For nonzero levels the leaf-ward information is untouched.
 */
extern int xfs_inobt_increment(struct xfs_btree_cur *cur, int level, int *stat);

/*
 * Insert the current record at the point referenced by cur.
 * The cursor may be inconsistent on return if splits have been done.
 */
extern int xfs_inobt_insert(struct xfs_btree_cur *cur, int *stat);

/*
 * Lookup the record equal to ino in the btree given by cur.
 */
extern int xfs_inobt_lookup_eq(struct xfs_btree_cur *cur, xfs_agino_t ino,
				__int32_t fcnt, xfs_inofree_t free, int *stat);

/*
 * Lookup the first record greater than or equal to ino
 * in the btree given by cur.
 */
extern int xfs_inobt_lookup_ge(struct xfs_btree_cur *cur, xfs_agino_t ino,
				__int32_t fcnt,	xfs_inofree_t free, int *stat);

/*
 * Lookup the first record less than or equal to ino
 * in the btree given by cur.
 */
extern int xfs_inobt_lookup_le(struct xfs_btree_cur *cur, xfs_agino_t ino,
				__int32_t fcnt,	xfs_inofree_t free, int *stat);

/*
 * Update the record referred to by cur, to the value given
 * by [ino, fcnt, free].
 * This either works (return 0) or gets an EFSCORRUPTED error.
 */
extern int xfs_inobt_update(struct xfs_btree_cur *cur, xfs_agino_t ino,
				__int32_t fcnt, xfs_inofree_t free);

#endif	/* __XFS_IALLOC_BTREE_H__ */