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_IS_FREE_DISK(rp,i) \
85 ((be64_to_cpu((rp)->ir_free) & XFS_INOBT_MASK(i)) != 0)
86 #define XFS_INOBT_SET_FREE(rp,i) ((rp)->ir_free |= XFS_INOBT_MASK(i))
87 #define XFS_INOBT_CLR_FREE(rp,i) ((rp)->ir_free &= ~XFS_INOBT_MASK(i))
90 * Real block structures have a size equal to the disk block size.
92 #define XFS_INOBT_BLOCK_SIZE(lev,cur) (1 << (cur)->bc_blocklog)
93 #define XFS_INOBT_BLOCK_MAXRECS(lev,cur) ((cur)->bc_mp->m_inobt_mxr[lev != 0])
94 #define XFS_INOBT_BLOCK_MINRECS(lev,cur) ((cur)->bc_mp->m_inobt_mnr[lev != 0])
95 #define XFS_INOBT_IS_LAST_REC(cur) \
96 ((cur)->bc_ptrs[0] == be16_to_cpu(XFS_BUF_TO_INOBT_BLOCK((cur)->bc_bufs[0])->bb_numrecs))
99 * Maximum number of inode btree levels.
101 #define XFS_IN_MAXLEVELS(mp) ((mp)->m_in_maxlevels)
104 * block numbers in the AG.
106 #define XFS_IBT_BLOCK(mp) ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1))
107 #define XFS_PREALLOC_BLOCKS(mp) ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1))
110 * Record, key, and pointer address macros for btree blocks.
112 #define XFS_INOBT_REC_ADDR(bb,i,cur) \
113 (XFS_BTREE_REC_ADDR(XFS_INOBT_BLOCK_SIZE(0,cur), xfs_inobt, bb, \
114 i, XFS_INOBT_BLOCK_MAXRECS(0, cur)))
115 #define XFS_INOBT_KEY_ADDR(bb,i,cur) \
116 (XFS_BTREE_KEY_ADDR(XFS_INOBT_BLOCK_SIZE(1,cur), xfs_inobt, bb, \
117 i, XFS_INOBT_BLOCK_MAXRECS(1, cur)))
119 #define XFS_INOBT_PTR_ADDR(bb,i,cur) \
120 (XFS_BTREE_PTR_ADDR(XFS_INOBT_BLOCK_SIZE(1,cur), xfs_inobt, bb, \
121 i, XFS_INOBT_BLOCK_MAXRECS(1, cur)))
124 * Decrement cursor by one record at the level.
125 * For nonzero levels the leaf-ward information is untouched.
127 extern int xfs_inobt_decrement(struct xfs_btree_cur *cur, int level, int *stat);
130 * Delete the record pointed to by cur.
131 * The cursor refers to the place where the record was (could be inserted)
132 * when the operation returns.
134 extern int xfs_inobt_delete(struct xfs_btree_cur *cur, int *stat);
137 * Get the data from the pointed-to record.
139 extern int xfs_inobt_get_rec(struct xfs_btree_cur *cur, xfs_agino_t *ino,
140 __int32_t *fcnt, xfs_inofree_t *free, int *stat);
143 * Increment cursor by one record at the level.
144 * For nonzero levels the leaf-ward information is untouched.
146 extern int xfs_inobt_increment(struct xfs_btree_cur *cur, int level, int *stat);
149 * Insert the current record at the point referenced by cur.
150 * The cursor may be inconsistent on return if splits have been done.
152 extern int xfs_inobt_insert(struct xfs_btree_cur *cur, int *stat);
155 * Lookup the record equal to ino in the btree given by cur.
157 extern int xfs_inobt_lookup_eq(struct xfs_btree_cur *cur, xfs_agino_t ino,
158 __int32_t fcnt, xfs_inofree_t free, int *stat);
161 * Lookup the first record greater than or equal to ino
162 * in the btree given by cur.
164 extern int xfs_inobt_lookup_ge(struct xfs_btree_cur *cur, xfs_agino_t ino,
165 __int32_t fcnt, xfs_inofree_t free, int *stat);
168 * Lookup the first record less than or equal to ino
169 * in the btree given by cur.
171 extern int xfs_inobt_lookup_le(struct xfs_btree_cur *cur, xfs_agino_t ino,
172 __int32_t fcnt, xfs_inofree_t free, int *stat);
175 * Update the record referred to by cur, to the value given
176 * by [ino, fcnt, free].
177 * This either works (return 0) or gets an EFSCORRUPTED error.
179 extern int xfs_inobt_update(struct xfs_btree_cur *cur, xfs_agino_t ino,
180 __int32_t fcnt, xfs_inofree_t free);
182 #endif /* __XFS_IALLOC_BTREE_H__ */