2 * Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it would be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12 * Further, this software is distributed without any warranty that it is
13 * free of the rightful claim of any third person regarding infringement
14 * or the like. Any license provided herein, whether implied or
15 * otherwise, applies only to this software file. Patent licenses, if
16 * any, provided herein do not apply to combinations of this program with
17 * other software, or any other product whatsoever.
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write the Free Software Foundation, Inc., 59
21 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
23 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
24 * Mountain View, CA 94043, or:
28 * For further information regarding this notice, see:
30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
32 #ifndef __XFS_IALLOC_H__
33 #define __XFS_IALLOC_H__
41 * Allocation parameters for inode allocation.
43 #define XFS_IALLOC_INODES(mp) (mp)->m_ialloc_inos
44 #define XFS_IALLOC_BLOCKS(mp) (mp)->m_ialloc_blks
47 * For small block file systems, move inodes in clusters of this size.
48 * When we don't have a lot of memory, however, we go a bit smaller
49 * to reduce the number of AGI and ialloc btree blocks we need to keep
50 * around for xfs_dilocate(). We choose which one to use in
53 #define XFS_INODE_BIG_CLUSTER_SIZE 8192
54 #define XFS_INODE_SMALL_CLUSTER_SIZE 4096
55 #define XFS_INODE_CLUSTER_SIZE(mp) (mp)->m_inode_cluster_size
58 * Make an inode pointer out of the buffer/offset.
60 #define XFS_MAKE_IPTR(mp,b,o) xfs_make_iptr(mp,b,o)
61 static inline struct xfs_dinode *
62 xfs_make_iptr(struct xfs_mount *mp, struct xfs_buf *b, int o)
64 return (xfs_dinode_t *)
65 (xfs_buf_offset(b, o << (mp)->m_sb.sb_inodelog));
69 * Find a free (set) bit in the inode bitmask.
71 #define XFS_IALLOC_FIND_FREE(fp) xfs_ialloc_find_free(fp)
72 static inline int xfs_ialloc_find_free(xfs_inofree_t *fp)
74 return xfs_lowbit64(*fp);
80 * Allocate an inode on disk.
81 * Mode is used to tell whether the new inode will need space, and whether
84 * To work within the constraint of one allocation per transaction,
85 * xfs_dialloc() is designed to be called twice if it has to do an
86 * allocation to make more free inodes. If an inode is
87 * available without an allocation, agbp would be set to the current
88 * agbp and alloc_done set to false.
89 * If an allocation needed to be done, agbp would be set to the
90 * inode header of the allocation group and alloc_done set to true.
91 * The caller should then commit the current transaction and allocate a new
92 * transaction. xfs_dialloc() should then be called again with
93 * the agbp value returned from the previous call.
95 * Once we successfully pick an inode its number is returned and the
96 * on-disk data structures are updated. The inode itself is not read
97 * in, since doing so would break ordering constraints with xfs_reclaim.
99 * *agbp should be set to NULL on the first call, *alloc_done set to FALSE.
103 struct xfs_trans *tp, /* transaction pointer */
104 xfs_ino_t parent, /* parent inode (directory) */
105 mode_t mode, /* mode bits for new inode */
106 int okalloc, /* ok to allocate more space */
107 struct xfs_buf **agbp, /* buf for a.g. inode header */
108 boolean_t *alloc_done, /* an allocation was done to replenish
110 xfs_ino_t *inop); /* inode number allocated */
113 * Free disk inode. Carefully avoids touching the incore inode, all
114 * manipulations incore are the caller's responsibility.
115 * The on-disk inode is not changed by this operation, only the
116 * btree (free inode mask) is changed.
120 struct xfs_trans *tp, /* transaction pointer */
121 xfs_ino_t inode, /* inode to be freed */
122 struct xfs_bmap_free *flist, /* extents to free */
123 int *delete, /* set if inode cluster was deleted */
124 xfs_ino_t *first_ino); /* first inode in deleted cluster */
127 * Return the location of the inode in bno/len/off,
128 * for mapping it into a buffer.
132 struct xfs_mount *mp, /* file system mount structure */
133 struct xfs_trans *tp, /* transaction pointer */
134 xfs_ino_t ino, /* inode to locate */
135 xfs_fsblock_t *bno, /* output: block containing inode */
136 int *len, /* output: num blocks in cluster*/
137 int *off, /* output: index in block of inode */
138 uint flags); /* flags for inode btree lookup */
141 * Compute and fill in value of m_in_maxlevels.
144 xfs_ialloc_compute_maxlevels(
145 struct xfs_mount *mp); /* file system mount structure */
148 * Log specified fields for the ag hdr (inode section)
152 struct xfs_trans *tp, /* transaction pointer */
153 struct xfs_buf *bp, /* allocation group header buffer */
154 int fields); /* bitmask of fields to log */
157 * Read in the allocation group header (inode allocation section)
161 struct xfs_mount *mp, /* file system mount structure */
162 struct xfs_trans *tp, /* transaction pointer */
163 xfs_agnumber_t agno, /* allocation group number */
164 struct xfs_buf **bpp); /* allocation group hdr buf */
166 #endif /* __KERNEL__ */
168 #endif /* __XFS_IALLOC_H__ */