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xfs_ialloc.h
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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 *
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  * Allocate an inode on disk.
51  * Mode is used to tell whether the new inode will need space, and whether
52  * it is a directory.
53  *
54  * To work within the constraint of one allocation per transaction,
55  * xfs_dialloc() is designed to be called twice if it has to do an
56  * allocation to make more free inodes. If an inode is
57  * available without an allocation, agbp would be set to the current
58  * agbp and alloc_done set to false.
59  * If an allocation needed to be done, agbp would be set to the
60  * inode header of the allocation group and alloc_done set to true.
61  * The caller should then commit the current transaction and allocate a new
62  * transaction. xfs_dialloc() should then be called again with
63  * the agbp value returned from the previous call.
64  *
65  * Once we successfully pick an inode its number is returned and the
66  * on-disk data structures are updated. The inode itself is not read
67  * in, since doing so would break ordering constraints with xfs_reclaim.
68  *
69  * *agbp should be set to NULL on the first call, *alloc_done set to FALSE.
70  */
71 int /* error */
72 xfs_dialloc(
73  struct xfs_trans *tp, /* transaction pointer */
74  xfs_ino_t parent, /* parent inode (directory) */
75  umode_t mode, /* mode bits for new inode */
76  int okalloc, /* ok to allocate more space */
77  struct xfs_buf **agbp, /* buf for a.g. inode header */
78  xfs_ino_t *inop); /* inode number allocated */
79 
80 /*
81  * Free disk inode. Carefully avoids touching the incore inode, all
82  * manipulations incore are the caller's responsibility.
83  * The on-disk inode is not changed by this operation, only the
84  * btree (free inode mask) is changed.
85  */
86 int /* error */
87 xfs_difree(
88  struct xfs_trans *tp, /* transaction pointer */
89  xfs_ino_t inode, /* inode to be freed */
90  struct xfs_bmap_free *flist, /* extents to free */
91  int *delete, /* set if inode cluster was deleted */
92  xfs_ino_t *first_ino); /* first inode in deleted cluster */
93 
94 /*
95  * Return the location of the inode in imap, for mapping it into a buffer.
96  */
97 int
98 xfs_imap(
99  struct xfs_mount *mp, /* file system mount structure */
100  struct xfs_trans *tp, /* transaction pointer */
101  xfs_ino_t ino, /* inode to locate */
102  struct xfs_imap *imap, /* location map structure */
103  uint flags); /* flags for inode btree lookup */
104 
105 /*
106  * Compute and fill in value of m_in_maxlevels.
107  */
108 void
109 xfs_ialloc_compute_maxlevels(
110  struct xfs_mount *mp); /* file system mount structure */
111 
112 /*
113  * Log specified fields for the ag hdr (inode section)
114  */
115 void
116 xfs_ialloc_log_agi(
117  struct xfs_trans *tp, /* transaction pointer */
118  struct xfs_buf *bp, /* allocation group header buffer */
119  int fields); /* bitmask of fields to log */
120 
121 /*
122  * Read in the allocation group header (inode allocation section)
123  */
124 int /* error */
125 xfs_ialloc_read_agi(
126  struct xfs_mount *mp, /* file system mount structure */
127  struct xfs_trans *tp, /* transaction pointer */
128  xfs_agnumber_t agno, /* allocation group number */
129  struct xfs_buf **bpp); /* allocation group hdr buf */
130 
131 /*
132  * Read in the allocation group header to initialise the per-ag data
133  * in the mount structure
134  */
135 int
136 xfs_ialloc_pagi_init(
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 
141 /*
142  * Lookup a record by ino in the btree given by cur.
143  */
144 int xfs_inobt_lookup(struct xfs_btree_cur *cur, xfs_agino_t ino,
145  xfs_lookup_t dir, int *stat);
146 
147 /*
148  * Get the data from the pointed-to record.
149  */
150 extern int xfs_inobt_get_rec(struct xfs_btree_cur *cur,
151  xfs_inobt_rec_incore_t *rec, int *stat);
152 
153 #endif /* __XFS_IALLOC_H__ */
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