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