Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[wrt350n-kernel.git] / fs / xfs / xfs_ialloc.h
blob4e30ec1d13bc35b3fd3af4b0b0ad50bde967ad58
1 /*
2 * Copyright (c) 2000,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
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__
21 struct xfs_buf;
22 struct xfs_dinode;
23 struct xfs_mount;
24 struct xfs_trans;
27 * Allocation parameters for inode allocation.
29 #define XFS_IALLOC_INODES(mp) (mp)->m_ialloc_inos
30 #define XFS_IALLOC_BLOCKS(mp) (mp)->m_ialloc_blks
33 * Move inodes in clusters of this size.
35 #define XFS_INODE_BIG_CLUSTER_SIZE 8192
36 #define XFS_INODE_CLUSTER_SIZE(mp) (mp)->m_inode_cluster_size
39 * Make an inode pointer out of the buffer/offset.
41 #define XFS_MAKE_IPTR(mp,b,o) xfs_make_iptr(mp,b,o)
42 static inline struct xfs_dinode *
43 xfs_make_iptr(struct xfs_mount *mp, struct xfs_buf *b, int o)
45 return (xfs_dinode_t *)
46 (xfs_buf_offset(b, o << (mp)->m_sb.sb_inodelog));
50 * Find a free (set) bit in the inode bitmask.
52 #define XFS_IALLOC_FIND_FREE(fp) xfs_ialloc_find_free(fp)
53 static inline int xfs_ialloc_find_free(xfs_inofree_t *fp)
55 return xfs_lowbit64(*fp);
59 #ifdef __KERNEL__
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.
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.
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.
80 * *agbp should be set to NULL on the first call, *alloc_done set to FALSE.
82 int /* error */
83 xfs_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 */
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.
99 int /* error */
100 xfs_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 */
108 * Return the location of the inode in bno/len/off,
109 * for mapping it into a buffer.
112 xfs_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 */
122 * Compute and fill in value of m_in_maxlevels.
124 void
125 xfs_ialloc_compute_maxlevels(
126 struct xfs_mount *mp); /* file system mount structure */
129 * Log specified fields for the ag hdr (inode section)
131 void
132 xfs_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 */
138 * Read in the allocation group header (inode allocation section)
140 int /* error */
141 xfs_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 */
148 * Read in the allocation group header to initialise the per-ag data
149 * in the mount structure
152 xfs_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 */
157 #endif /* __KERNEL__ */
159 #endif /* __XFS_IALLOC_H__ */