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diff --git a/fs/xfs/libxfs/xfs_ialloc.h b/fs/xfs/libxfs/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
21struct xfs_buf;
22struct xfs_dinode;
23struct xfs_imap;
24struct xfs_mount;
25struct xfs_trans;
26struct xfs_btree_cur;
27
28/* Move inodes in clusters of this size */
29#define XFS_INODE_BIG_CLUSTER_SIZE 8192
30
31/* Calculate and return the number of filesystem blocks per inode cluster */
32static inline int
33xfs_icluster_size_fsb(
34 struct xfs_mount *mp)
35{
36 if (mp->m_sb.sb_blocksize >= mp->m_inode_cluster_size)
37 return 1;
38 return mp->m_inode_cluster_size >> mp->m_sb.sb_blocklog;
39}
40
41/*
42 * Make an inode pointer out of the buffer/offset.
43 */
44static inline struct xfs_dinode *
45xfs_make_iptr(struct xfs_mount *mp, struct xfs_buf *b, int o)
46{
47 return (struct xfs_dinode *)
48 (xfs_buf_offset(b, o << (mp)->m_sb.sb_inodelog));
49}
50
51/*
52 * Allocate an inode on disk.
53 * Mode is used to tell whether the new inode will need space, and whether
54 * it is a directory.
55 *
56 * To work within the constraint of one allocation per transaction,
57 * xfs_dialloc() is designed to be called twice if it has to do an
58 * allocation to make more free inodes. If an inode is
59 * available without an allocation, agbp would be set to the current
60 * agbp and alloc_done set to false.
61 * If an allocation needed to be done, agbp would be set to the
62 * inode header of the allocation group and alloc_done set to true.
63 * The caller should then commit the current transaction and allocate a new
64 * transaction. xfs_dialloc() should then be called again with
65 * the agbp value returned from the previous call.
66 *
67 * Once we successfully pick an inode its number is returned and the
68 * on-disk data structures are updated. The inode itself is not read
69 * in, since doing so would break ordering constraints with xfs_reclaim.
70 *
71 * *agbp should be set to NULL on the first call, *alloc_done set to FALSE.
72 */
73int /* error */
74xfs_dialloc(
75 struct xfs_trans *tp, /* transaction pointer */
76 xfs_ino_t parent, /* parent inode (directory) */
77 umode_t mode, /* mode bits for new inode */
78 int okalloc, /* ok to allocate more space */
79 struct xfs_buf **agbp, /* buf for a.g. inode header */
80 xfs_ino_t *inop); /* inode number allocated */
81
82/*
83 * Free disk inode. Carefully avoids touching the incore inode, all
84 * manipulations incore are the caller's responsibility.
85 * The on-disk inode is not changed by this operation, only the
86 * btree (free inode mask) is changed.
87 */
88int /* error */
89xfs_difree(
90 struct xfs_trans *tp, /* transaction pointer */
91 xfs_ino_t inode, /* inode to be freed */
92 struct xfs_bmap_free *flist, /* extents to free */
93 int *deleted, /* set if inode cluster was deleted */
94 xfs_ino_t *first_ino); /* first inode in deleted cluster */
95
96/*
97 * Return the location of the inode in imap, for mapping it into a buffer.
98 */
99int
100xfs_imap(
101 struct xfs_mount *mp, /* file system mount structure */
102 struct xfs_trans *tp, /* transaction pointer */
103 xfs_ino_t ino, /* inode to locate */
104 struct xfs_imap *imap, /* location map structure */
105 uint flags); /* flags for inode btree lookup */
106
107/*
108 * Compute and fill in value of m_in_maxlevels.
109 */
110void
111xfs_ialloc_compute_maxlevels(
112 struct xfs_mount *mp); /* file system mount structure */
113
114/*
115 * Log specified fields for the ag hdr (inode section)
116 */
117void
118xfs_ialloc_log_agi(
119 struct xfs_trans *tp, /* transaction pointer */
120 struct xfs_buf *bp, /* allocation group header buffer */
121 int fields); /* bitmask of fields to log */
122
123/*
124 * Read in the allocation group header (inode allocation section)
125 */
126int /* error */
127xfs_ialloc_read_agi(
128 struct xfs_mount *mp, /* file system mount structure */
129 struct xfs_trans *tp, /* transaction pointer */
130 xfs_agnumber_t agno, /* allocation group number */
131 struct xfs_buf **bpp); /* allocation group hdr buf */
132
133/*
134 * Read in the allocation group header to initialise the per-ag data
135 * in the mount structure
136 */
137int
138xfs_ialloc_pagi_init(
139 struct xfs_mount *mp, /* file system mount structure */
140 struct xfs_trans *tp, /* transaction pointer */
141 xfs_agnumber_t agno); /* allocation group number */
142
143/*
144 * Lookup a record by ino in the btree given by cur.
145 */
146int xfs_inobt_lookup(struct xfs_btree_cur *cur, xfs_agino_t ino,
147 xfs_lookup_t dir, int *stat);
148
149/*
150 * Get the data from the pointed-to record.
151 */
152int xfs_inobt_get_rec(struct xfs_btree_cur *cur,
153 xfs_inobt_rec_incore_t *rec, int *stat);
154
155/*
156 * Inode chunk initialisation routine
157 */
158int xfs_ialloc_inode_init(struct xfs_mount *mp, struct xfs_trans *tp,
159 struct list_head *buffer_list,
160 xfs_agnumber_t agno, xfs_agblock_t agbno,
161 xfs_agblock_t length, unsigned int gen);
162
163#endif /* __XFS_IALLOC_H__ */
generated by cgit v1.2.2 (git 2.25.0) at 2025-02-20 07:17:43 -0500