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_H__
19 #define __XFS_IALLOC_H__
20
21 struct xfs_buf;
22 struct xfs_dinode;
23 struct xfs_imap;
24 struct xfs_mount;
25 struct xfs_trans;
26
27 /*
28 * Allocation parameters for inode allocation.
29 */
30 #define XFS_IALLOC_INODES(mp) (mp)->m_ialloc_inos
31 #define XFS_IALLOC_BLOCKS(mp) (mp)->m_ialloc_blks
32
33 /*
34 * Move inodes in clusters of this size.
35 */
36 #define XFS_INODE_BIG_CLUSTER_SIZE 8192
37 #define XFS_INODE_CLUSTER_SIZE(mp) (mp)->m_inode_cluster_size
38
39 /*
40 * Make an inode pointer out of the buffer/offset.
41 */
42 static inline struct xfs_dinode *
xfs_make_iptr(struct xfs_mount * mp,struct xfs_buf * b,int o)43 xfs_make_iptr(struct xfs_mount *mp, struct xfs_buf *b, int o)
44 {
45 return (xfs_dinode_t *)
46 (xfs_buf_offset(b, o << (mp)->m_sb.sb_inodelog));
47 }
48
49 /*
50 * Find a free (set) bit in the inode bitmask.
51 */
xfs_ialloc_find_free(xfs_inofree_t * fp)52 static inline int xfs_ialloc_find_free(xfs_inofree_t *fp)
53 {
54 return xfs_lowbit64(*fp);
55 }
56
57
58 /*
59 * Allocate an inode on disk.
60 * Mode is used to tell whether the new inode will need space, and whether
61 * it is a directory.
62 *
63 * To work within the constraint of one allocation per transaction,
64 * xfs_dialloc() is designed to be called twice if it has to do an
65 * allocation to make more free inodes. If an inode is
66 * available without an allocation, agbp would be set to the current
67 * agbp and alloc_done set to false.
68 * If an allocation needed to be done, agbp would be set to the
69 * inode header of the allocation group and alloc_done set to true.
70 * The caller should then commit the current transaction and allocate a new
71 * transaction. xfs_dialloc() should then be called again with
72 * the agbp value returned from the previous call.
73 *
74 * Once we successfully pick an inode its number is returned and the
75 * on-disk data structures are updated. The inode itself is not read
76 * in, since doing so would break ordering constraints with xfs_reclaim.
77 *
78 * *agbp should be set to NULL on the first call, *alloc_done set to FALSE.
79 */
80 int /* error */
81 xfs_dialloc(
82 struct xfs_trans *tp, /* transaction pointer */
83 xfs_ino_t parent, /* parent inode (directory) */
84 mode_t mode, /* mode bits for new inode */
85 int okalloc, /* ok to allocate more space */
86 struct xfs_buf **agbp, /* buf for a.g. inode header */
87 boolean_t *alloc_done, /* an allocation was done to replenish
88 the free inodes */
89 xfs_ino_t *inop); /* inode number allocated */
90
91 /*
92 * Free disk inode. Carefully avoids touching the incore inode, all
93 * manipulations incore are the caller's responsibility.
94 * The on-disk inode is not changed by this operation, only the
95 * btree (free inode mask) is changed.
96 */
97 int /* error */
98 xfs_difree(
99 struct xfs_trans *tp, /* transaction pointer */
100 xfs_ino_t inode, /* inode to be freed */
101 struct xfs_bmap_free *flist, /* extents to free */
102 int *delete, /* set if inode cluster was deleted */
103 xfs_ino_t *first_ino); /* first inode in deleted cluster */
104
105 /*
106 * Return the location of the inode in imap, for mapping it into a buffer.
107 */
108 int
109 xfs_imap(
110 struct xfs_mount *mp, /* file system mount structure */
111 struct xfs_trans *tp, /* transaction pointer */
112 xfs_ino_t ino, /* inode to locate */
113 struct xfs_imap *imap, /* location map structure */
114 uint flags); /* flags for inode btree lookup */
115
116 /*
117 * Compute and fill in value of m_in_maxlevels.
118 */
119 void
120 xfs_ialloc_compute_maxlevels(
121 struct xfs_mount *mp); /* file system mount structure */
122
123 /*
124 * Log specified fields for the ag hdr (inode section)
125 */
126 void
127 xfs_ialloc_log_agi(
128 struct xfs_trans *tp, /* transaction pointer */
129 struct xfs_buf *bp, /* allocation group header buffer */
130 int fields); /* bitmask of fields to log */
131
132 /*
133 * Read in the allocation group header (inode allocation section)
134 */
135 int /* error */
136 xfs_ialloc_read_agi(
137 struct xfs_mount *mp, /* file system mount structure */
138 struct xfs_trans *tp, /* transaction pointer */
139 xfs_agnumber_t agno, /* allocation group number */
140 struct xfs_buf **bpp); /* allocation group hdr buf */
141
142 /*
143 * Read in the allocation group header to initialise the per-ag data
144 * in the mount structure
145 */
146 int
147 xfs_ialloc_pagi_init(
148 struct xfs_mount *mp, /* file system mount structure */
149 struct xfs_trans *tp, /* transaction pointer */
150 xfs_agnumber_t agno); /* allocation group number */
151
152 /*
153 * Lookup a record by ino in the btree given by cur.
154 */
155 int xfs_inobt_lookup(struct xfs_btree_cur *cur, xfs_agino_t ino,
156 xfs_lookup_t dir, int *stat);
157
158 /*
159 * Get the data from the pointed-to record.
160 */
161 extern int xfs_inobt_get_rec(struct xfs_btree_cur *cur,
162 xfs_inobt_rec_incore_t *rec, int *stat);
163
164 #endif /* __XFS_IALLOC_H__ */
165