1 /*
2 * Copyright (c) 2000-2001,2005 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_DIR2_BLOCK_H__
19 #define __XFS_DIR2_BLOCK_H__
20
21 /*
22 * xfs_dir2_block.h
23 * Directory version 2, single block format structures
24 */
25
26 struct uio;
27 struct xfs_dabuf;
28 struct xfs_da_args;
29 struct xfs_dir2_data_hdr;
30 struct xfs_dir2_leaf_entry;
31 struct xfs_inode;
32 struct xfs_mount;
33 struct xfs_trans;
34
35 /*
36 * The single block format is as follows:
37 * xfs_dir2_data_hdr_t structure
38 * xfs_dir2_data_entry_t and xfs_dir2_data_unused_t structures
39 * xfs_dir2_leaf_entry_t structures
40 * xfs_dir2_block_tail_t structure
41 */
42
43 #define XFS_DIR2_BLOCK_MAGIC 0x58443242 /* XD2B: for one block dirs */
44
45 typedef struct xfs_dir2_block_tail {
46 __be32 count; /* count of leaf entries */
47 __be32 stale; /* count of stale lf entries */
48 } xfs_dir2_block_tail_t;
49
50 /*
51 * Generic single-block structure, for xfs_db.
52 */
53 typedef struct xfs_dir2_block {
54 xfs_dir2_data_hdr_t hdr; /* magic XFS_DIR2_BLOCK_MAGIC */
55 xfs_dir2_data_union_t u[1];
56 xfs_dir2_leaf_entry_t leaf[1];
57 xfs_dir2_block_tail_t tail;
58 } xfs_dir2_block_t;
59
60 /*
61 * Pointer to the leaf header embedded in a data block (1-block format)
62 */
63 static inline xfs_dir2_block_tail_t *
xfs_dir2_block_tail_p(struct xfs_mount * mp,xfs_dir2_block_t * block)64 xfs_dir2_block_tail_p(struct xfs_mount *mp, xfs_dir2_block_t *block)
65 {
66 return (((xfs_dir2_block_tail_t *)
67 ((char *)(block) + (mp)->m_dirblksize)) - 1);
68 }
69
70 /*
71 * Pointer to the leaf entries embedded in a data block (1-block format)
72 */
73 static inline struct xfs_dir2_leaf_entry *
xfs_dir2_block_leaf_p(xfs_dir2_block_tail_t * btp)74 xfs_dir2_block_leaf_p(xfs_dir2_block_tail_t *btp)
75 {
76 return ((struct xfs_dir2_leaf_entry *)btp) - be32_to_cpu(btp->count);
77 }
78
79 /*
80 * Function declarations.
81 */
82 extern int xfs_dir2_block_addname(struct xfs_da_args *args);
83 extern int xfs_dir2_block_getdents(struct xfs_inode *dp, void *dirent,
84 xfs_off_t *offset, filldir_t filldir);
85 extern int xfs_dir2_block_lookup(struct xfs_da_args *args);
86 extern int xfs_dir2_block_removename(struct xfs_da_args *args);
87 extern int xfs_dir2_block_replace(struct xfs_da_args *args);
88 extern int xfs_dir2_leaf_to_block(struct xfs_da_args *args,
89 struct xfs_dabuf *lbp, struct xfs_dabuf *dbp);
90 extern int xfs_dir2_sf_to_block(struct xfs_da_args *args);
91
92 #endif /* __XFS_DIR2_BLOCK_H__ */
93