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diff --git a/fs/xfs/xfs_dir.h b/fs/xfs/xfs_dir.h
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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_DIR_H__
19#define __XFS_DIR_H__
20
21/*
22 * Large directories are structured around Btrees where all the data
23 * elements are in the leaf nodes. Filenames are hashed into an int,
24 * then that int is used as the index into the Btree. Since the hashval
25 * of a filename may not be unique, we may have duplicate keys. The
26 * internal links in the Btree are logical block offsets into the file.
27 *
28 * Small directories use a different format and are packed as tightly
29 * as possible so as to fit into the literal area of the inode.
30 */
31
32/*========================================================================
33 * Function prototypes for the kernel.
34 *========================================================================*/
35
36struct uio;
37struct xfs_bmap_free;
38struct xfs_da_args;
39struct xfs_dinode;
40struct xfs_inode;
41struct xfs_mount;
42struct xfs_trans;
43
44/*
45 * Directory function types.
46 * Put in structures (xfs_dirops_t) for v1 and v2 directories.
47 */
48typedef void (*xfs_dir_mount_t)(struct xfs_mount *mp);
49typedef int (*xfs_dir_isempty_t)(struct xfs_inode *dp);
50typedef int (*xfs_dir_init_t)(struct xfs_trans *tp,
51 struct xfs_inode *dp,
52 struct xfs_inode *pdp);
53typedef int (*xfs_dir_createname_t)(struct xfs_trans *tp,
54 struct xfs_inode *dp,
55 char *name,
56 int namelen,
57 xfs_ino_t inum,
58 xfs_fsblock_t *first,
59 struct xfs_bmap_free *flist,
60 xfs_extlen_t total);
61typedef int (*xfs_dir_lookup_t)(struct xfs_trans *tp,
62 struct xfs_inode *dp,
63 char *name,
64 int namelen,
65 xfs_ino_t *inum);
66typedef int (*xfs_dir_removename_t)(struct xfs_trans *tp,
67 struct xfs_inode *dp,
68 char *name,
69 int namelen,
70 xfs_ino_t ino,
71 xfs_fsblock_t *first,
72 struct xfs_bmap_free *flist,
73 xfs_extlen_t total);
74typedef int (*xfs_dir_getdents_t)(struct xfs_trans *tp,
75 struct xfs_inode *dp,
76 struct uio *uio,
77 int *eofp);
78typedef int (*xfs_dir_replace_t)(struct xfs_trans *tp,
79 struct xfs_inode *dp,
80 char *name,
81 int namelen,
82 xfs_ino_t inum,
83 xfs_fsblock_t *first,
84 struct xfs_bmap_free *flist,
85 xfs_extlen_t total);
86typedef int (*xfs_dir_canenter_t)(struct xfs_trans *tp,
87 struct xfs_inode *dp,
88 char *name,
89 int namelen);
90typedef int (*xfs_dir_shortform_validate_ondisk_t)(struct xfs_mount *mp,
91 struct xfs_dinode *dip);
92typedef int (*xfs_dir_shortform_to_single_t)(struct xfs_da_args *args);
93
94typedef struct xfs_dirops {
95 xfs_dir_mount_t xd_mount;
96 xfs_dir_isempty_t xd_isempty;
97 xfs_dir_init_t xd_init;
98 xfs_dir_createname_t xd_createname;
99 xfs_dir_lookup_t xd_lookup;
100 xfs_dir_removename_t xd_removename;
101 xfs_dir_getdents_t xd_getdents;
102 xfs_dir_replace_t xd_replace;
103 xfs_dir_canenter_t xd_canenter;
104 xfs_dir_shortform_validate_ondisk_t xd_shortform_validate_ondisk;
105 xfs_dir_shortform_to_single_t xd_shortform_to_single;
106} xfs_dirops_t;
107
108/*
109 * Overall external interface routines.
110 */
111void xfs_dir_startup(void); /* called exactly once */
112
113#define XFS_DIR_MOUNT(mp) \
114 ((mp)->m_dirops.xd_mount(mp))
115#define XFS_DIR_ISEMPTY(mp,dp) \
116 ((mp)->m_dirops.xd_isempty(dp))
117#define XFS_DIR_INIT(mp,tp,dp,pdp) \
118 ((mp)->m_dirops.xd_init(tp,dp,pdp))
119#define XFS_DIR_CREATENAME(mp,tp,dp,name,namelen,inum,first,flist,total) \
120 ((mp)->m_dirops.xd_createname(tp,dp,name,namelen,inum,first,flist,\
121 total))
122#define XFS_DIR_LOOKUP(mp,tp,dp,name,namelen,inum) \
123 ((mp)->m_dirops.xd_lookup(tp,dp,name,namelen,inum))
124#define XFS_DIR_REMOVENAME(mp,tp,dp,name,namelen,ino,first,flist,total) \
125 ((mp)->m_dirops.xd_removename(tp,dp,name,namelen,ino,first,flist,total))
126#define XFS_DIR_GETDENTS(mp,tp,dp,uio,eofp) \
127 ((mp)->m_dirops.xd_getdents(tp,dp,uio,eofp))
128#define XFS_DIR_REPLACE(mp,tp,dp,name,namelen,inum,first,flist,total) \
129 ((mp)->m_dirops.xd_replace(tp,dp,name,namelen,inum,first,flist,total))
130#define XFS_DIR_CANENTER(mp,tp,dp,name,namelen) \
131 ((mp)->m_dirops.xd_canenter(tp,dp,name,namelen))
132#define XFS_DIR_SHORTFORM_VALIDATE_ONDISK(mp,dip) \
133 ((mp)->m_dirops.xd_shortform_validate_ondisk(mp,dip))
134#define XFS_DIR_SHORTFORM_TO_SINGLE(mp,args) \
135 ((mp)->m_dirops.xd_shortform_to_single(args))
136
137#define XFS_DIR_IS_V1(mp) ((mp)->m_dirversion == 1)
138#define XFS_DIR_IS_V2(mp) ((mp)->m_dirversion == 2)
139extern xfs_dirops_t xfsv1_dirops;
140extern xfs_dirops_t xfsv2_dirops;
141
142#endif /* __XFS_DIR_H__ */
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