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_H__
19 #define __XFS_IALLOC_H__
28 /* Move inodes in clusters of this size */
29 #define XFS_INODE_BIG_CLUSTER_SIZE 8192
31 /* Calculate and return the number of filesystem blocks per inode cluster */
33 xfs_icluster_size_fsb(
36 if (mp
->m_sb
.sb_blocksize
>= mp
->m_inode_cluster_size
)
38 return mp
->m_inode_cluster_size
>> mp
->m_sb
.sb_blocklog
;
42 * Make an inode pointer out of the buffer/offset.
44 static inline struct xfs_dinode
*
45 xfs_make_iptr(struct xfs_mount
*mp
, struct xfs_buf
*b
, int o
)
47 return (struct xfs_dinode
*)
48 (xfs_buf_offset(b
, o
<< (mp
)->m_sb
.sb_inodelog
));
52 * Allocate an inode on disk.
53 * Mode is used to tell whether the new inode will need space, and whether
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.
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.
71 * *agbp should be set to NULL on the first call, *alloc_done set to FALSE.
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 */
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.
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 *delete, /* set if inode cluster was deleted */
94 xfs_ino_t
*first_ino
); /* first inode in deleted cluster */
97 * Return the location of the inode in imap, for mapping it into a buffer.
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 */
108 * Compute and fill in value of m_in_maxlevels.
111 xfs_ialloc_compute_maxlevels(
112 struct xfs_mount
*mp
); /* file system mount structure */
115 * Log specified fields for the ag hdr (inode section)
119 struct xfs_trans
*tp
, /* transaction pointer */
120 struct xfs_buf
*bp
, /* allocation group header buffer */
121 int fields
); /* bitmask of fields to log */
124 * Read in the allocation group header (inode allocation section)
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 */
134 * Read in the allocation group header to initialise the per-ag data
135 * in the mount structure
138 xfs_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 */
144 * Lookup a record by ino in the btree given by cur.
146 int xfs_inobt_lookup(struct xfs_btree_cur
*cur
, xfs_agino_t ino
,
147 xfs_lookup_t dir
, int *stat
);
150 * Get the data from the pointed-to record.
152 int xfs_inobt_get_rec(struct xfs_btree_cur
*cur
,
153 xfs_inobt_rec_incore_t
*rec
, int *stat
);
156 * Inode chunk initialisation routine
158 int 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
);
163 #endif /* __XFS_IALLOC_H__ */