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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Nathan Scott7b718762005-11-02 14:58:39 +11002 * Copyright (c) 2000,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
Nathan Scott7b718762005-11-02 14:58:39 +11005 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * published by the Free Software Foundation.
8 *
Nathan Scott7b718762005-11-02 14:58:39 +11009 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
Nathan Scott7b718762005-11-02 14:58:39 +110014 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 */
18#ifndef __XFS_IALLOC_BTREE_H__
19#define __XFS_IALLOC_BTREE_H__
20
21/*
22 * Inode map on-disk structures
23 */
24
25struct xfs_buf;
26struct xfs_btree_cur;
27struct xfs_btree_sblock;
28struct xfs_mount;
29
30/*
31 * There is a btree for the inode map per allocation group.
32 */
33#define XFS_IBT_MAGIC 0x49414254 /* 'IABT' */
34
35typedef __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
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#define XFS_INOBT_MASKN(i,n) xfs_inobt_maskn(i,n)
Nathan Scotta844f452005-11-02 14:38:42 +110041static inline xfs_inofree_t xfs_inobt_maskn(int i, int n)
42{
43 return (((n) >= XFS_INODES_PER_CHUNK ? \
44 (xfs_inofree_t)0 : ((xfs_inofree_t)1 << (n))) - 1) << (i);
45}
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
47/*
48 * Data record structure
49 */
50typedef struct xfs_inobt_rec
51{
52 xfs_agino_t ir_startino; /* starting inode number */
53 __int32_t ir_freecount; /* count of free inodes (set bits) */
54 xfs_inofree_t ir_free; /* free inode mask */
55} xfs_inobt_rec_t;
56
57/*
58 * Key structure
59 */
60typedef struct xfs_inobt_key
61{
62 xfs_agino_t ir_startino; /* starting inode number */
63} xfs_inobt_key_t;
64
Christoph Hellwig16259e72005-11-02 15:11:25 +110065/* btree pointer type */
66typedef __be32 xfs_inobt_ptr_t;
67
68/* btree block header type */
Linus Torvalds1da177e2005-04-16 15:20:36 -070069typedef struct xfs_btree_sblock xfs_inobt_block_t;
70
Nathan Scotta844f452005-11-02 14:38:42 +110071#define XFS_BUF_TO_INOBT_BLOCK(bp) ((xfs_inobt_block_t *)XFS_BUF_PTR(bp))
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
73/*
74 * Bit manipulations for ir_free.
75 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070076#define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i))
Nathan Scotta844f452005-11-02 14:38:42 +110077#define XFS_INOBT_IS_FREE(rp,i) \
78 (((rp)->ir_free & XFS_INOBT_MASK(i)) != 0)
79#define XFS_INOBT_IS_FREE_DISK(rp,i) \
80 ((INT_GET((rp)->ir_free,ARCH_CONVERT) & XFS_INOBT_MASK(i)) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070081#define XFS_INOBT_SET_FREE(rp,i) ((rp)->ir_free |= XFS_INOBT_MASK(i))
Linus Torvalds1da177e2005-04-16 15:20:36 -070082#define XFS_INOBT_CLR_FREE(rp,i) ((rp)->ir_free &= ~XFS_INOBT_MASK(i))
Linus Torvalds1da177e2005-04-16 15:20:36 -070083
84/*
85 * Real block structures have a size equal to the disk block size.
86 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070087#define XFS_INOBT_BLOCK_SIZE(lev,cur) (1 << (cur)->bc_blocklog)
Nathan Scotta844f452005-11-02 14:38:42 +110088#define XFS_INOBT_BLOCK_MAXRECS(lev,cur) ((cur)->bc_mp->m_inobt_mxr[lev != 0])
89#define XFS_INOBT_BLOCK_MINRECS(lev,cur) ((cur)->bc_mp->m_inobt_mnr[lev != 0])
Linus Torvalds1da177e2005-04-16 15:20:36 -070090#define XFS_INOBT_IS_LAST_REC(cur) \
Christoph Hellwig16259e72005-11-02 15:11:25 +110091 ((cur)->bc_ptrs[0] == be16_to_cpu(XFS_BUF_TO_INOBT_BLOCK((cur)->bc_bufs[0])->bb_numrecs))
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
93/*
94 * Maximum number of inode btree levels.
95 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070096#define XFS_IN_MAXLEVELS(mp) ((mp)->m_in_maxlevels)
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
98/*
99 * block numbers in the AG.
100 */
Nathan Scotta844f452005-11-02 14:38:42 +1100101#define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1))
102#define XFS_PREALLOC_BLOCKS(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
104/*
105 * Record, key, and pointer address macros for btree blocks.
106 */
Nathan Scotta844f452005-11-02 14:38:42 +1100107#define XFS_INOBT_REC_ADDR(bb,i,cur) \
108 (XFS_BTREE_REC_ADDR(XFS_INOBT_BLOCK_SIZE(0,cur), xfs_inobt, bb, \
109 i, XFS_INOBT_BLOCK_MAXRECS(0, cur)))
110#define XFS_INOBT_KEY_ADDR(bb,i,cur) \
111 (XFS_BTREE_KEY_ADDR(XFS_INOBT_BLOCK_SIZE(1,cur), xfs_inobt, bb, \
112 i, XFS_INOBT_BLOCK_MAXRECS(1, cur)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
Nathan Scotta844f452005-11-02 14:38:42 +1100114#define XFS_INOBT_PTR_ADDR(bb,i,cur) \
115 (XFS_BTREE_PTR_ADDR(XFS_INOBT_BLOCK_SIZE(1,cur), xfs_inobt, bb, \
116 i, XFS_INOBT_BLOCK_MAXRECS(1, cur)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117
118/*
119 * Decrement cursor by one record at the level.
120 * For nonzero levels the leaf-ward information is untouched.
121 */
Nathan Scotta844f452005-11-02 14:38:42 +1100122extern int xfs_inobt_decrement(struct xfs_btree_cur *cur, int level, int *stat);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123
124/*
125 * Delete the record pointed to by cur.
126 * The cursor refers to the place where the record was (could be inserted)
127 * when the operation returns.
128 */
Nathan Scotta844f452005-11-02 14:38:42 +1100129extern int xfs_inobt_delete(struct xfs_btree_cur *cur, int *stat);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
131/*
132 * Get the data from the pointed-to record.
133 */
Nathan Scotta844f452005-11-02 14:38:42 +1100134extern int xfs_inobt_get_rec(struct xfs_btree_cur *cur, xfs_agino_t *ino,
135 __int32_t *fcnt, xfs_inofree_t *free, int *stat);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
137/*
138 * Increment cursor by one record at the level.
139 * For nonzero levels the leaf-ward information is untouched.
140 */
Nathan Scotta844f452005-11-02 14:38:42 +1100141extern int xfs_inobt_increment(struct xfs_btree_cur *cur, int level, int *stat);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
143/*
144 * Insert the current record at the point referenced by cur.
145 * The cursor may be inconsistent on return if splits have been done.
146 */
Nathan Scotta844f452005-11-02 14:38:42 +1100147extern int xfs_inobt_insert(struct xfs_btree_cur *cur, int *stat);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
149/*
150 * Lookup the record equal to ino in the btree given by cur.
151 */
Nathan Scotta844f452005-11-02 14:38:42 +1100152extern int xfs_inobt_lookup_eq(struct xfs_btree_cur *cur, xfs_agino_t ino,
153 __int32_t fcnt, xfs_inofree_t free, int *stat);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154
155/*
156 * Lookup the first record greater than or equal to ino
157 * in the btree given by cur.
158 */
Nathan Scotta844f452005-11-02 14:38:42 +1100159extern int xfs_inobt_lookup_ge(struct xfs_btree_cur *cur, xfs_agino_t ino,
160 __int32_t fcnt, xfs_inofree_t free, int *stat);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
162/*
163 * Lookup the first record less than or equal to ino
164 * in the btree given by cur.
165 */
Nathan Scotta844f452005-11-02 14:38:42 +1100166extern int xfs_inobt_lookup_le(struct xfs_btree_cur *cur, xfs_agino_t ino,
167 __int32_t fcnt, xfs_inofree_t free, int *stat);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
169/*
170 * Update the record referred to by cur, to the value given
171 * by [ino, fcnt, free].
172 * This either works (return 0) or gets an EFSCORRUPTED error.
173 */
Nathan Scotta844f452005-11-02 14:38:42 +1100174extern int xfs_inobt_update(struct xfs_btree_cur *cur, xfs_agino_t ino,
175 __int32_t fcnt, xfs_inofree_t free);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176
177#endif /* __XFS_IALLOC_BTREE_H__ */