xfs_dir.h
5.54 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
/*
* Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* Further, this software is distributed without any warranty that it is
* free of the rightful claim of any third person regarding infringement
* or the like. Any license provided herein, whether implied or
* otherwise, applies only to this software file. Patent licenses, if
* any, provided herein do not apply to combinations of this program with
* other software, or any other product whatsoever.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston MA 02111-1307, USA.
*
* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
* Mountain View, CA 94043, or:
*
* http://www.sgi.com
*
* For further information regarding this notice, see:
*
* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
*/
#ifndef __XFS_DIR_H__
#define __XFS_DIR_H__
/*
* Large directories are structured around Btrees where all the data
* elements are in the leaf nodes. Filenames are hashed into an int,
* then that int is used as the index into the Btree. Since the hashval
* of a filename may not be unique, we may have duplicate keys. The
* internal links in the Btree are logical block offsets into the file.
*
* Small directories use a different format and are packed as tightly
* as possible so as to fit into the literal area of the inode.
*/
/*========================================================================
* Function prototypes for the kernel.
*========================================================================*/
struct uio;
struct xfs_bmap_free;
struct xfs_da_args;
struct xfs_dinode;
struct xfs_inode;
struct xfs_mount;
struct xfs_trans;
/*
* Directory function types.
* Put in structures (xfs_dirops_t) for v1 and v2 directories.
*/
typedef void (*xfs_dir_mount_t)(struct xfs_mount *mp);
typedef int (*xfs_dir_isempty_t)(struct xfs_inode *dp);
typedef int (*xfs_dir_init_t)(struct xfs_trans *tp,
struct xfs_inode *dp,
struct xfs_inode *pdp);
typedef int (*xfs_dir_createname_t)(struct xfs_trans *tp,
struct xfs_inode *dp,
char *name,
int namelen,
xfs_ino_t inum,
xfs_fsblock_t *first,
struct xfs_bmap_free *flist,
xfs_extlen_t total);
typedef int (*xfs_dir_lookup_t)(struct xfs_trans *tp,
struct xfs_inode *dp,
char *name,
int namelen,
xfs_ino_t *inum);
typedef int (*xfs_dir_removename_t)(struct xfs_trans *tp,
struct xfs_inode *dp,
char *name,
int namelen,
xfs_ino_t ino,
xfs_fsblock_t *first,
struct xfs_bmap_free *flist,
xfs_extlen_t total);
typedef int (*xfs_dir_getdents_t)(struct xfs_trans *tp,
struct xfs_inode *dp,
struct uio *uio,
int *eofp);
typedef int (*xfs_dir_replace_t)(struct xfs_trans *tp,
struct xfs_inode *dp,
char *name,
int namelen,
xfs_ino_t inum,
xfs_fsblock_t *first,
struct xfs_bmap_free *flist,
xfs_extlen_t total);
typedef int (*xfs_dir_canenter_t)(struct xfs_trans *tp,
struct xfs_inode *dp,
char *name,
int namelen);
typedef int (*xfs_dir_shortform_validate_ondisk_t)(struct xfs_mount *mp,
struct xfs_dinode *dip);
typedef int (*xfs_dir_shortform_to_single_t)(struct xfs_da_args *args);
typedef struct xfs_dirops {
xfs_dir_mount_t xd_mount;
xfs_dir_isempty_t xd_isempty;
xfs_dir_init_t xd_init;
xfs_dir_createname_t xd_createname;
xfs_dir_lookup_t xd_lookup;
xfs_dir_removename_t xd_removename;
xfs_dir_getdents_t xd_getdents;
xfs_dir_replace_t xd_replace;
xfs_dir_canenter_t xd_canenter;
xfs_dir_shortform_validate_ondisk_t xd_shortform_validate_ondisk;
xfs_dir_shortform_to_single_t xd_shortform_to_single;
} xfs_dirops_t;
/*
* Overall external interface routines.
*/
void xfs_dir_startup(void); /* called exactly once */
#define XFS_DIR_MOUNT(mp) \
((mp)->m_dirops.xd_mount(mp))
#define XFS_DIR_ISEMPTY(mp,dp) \
((mp)->m_dirops.xd_isempty(dp))
#define XFS_DIR_INIT(mp,tp,dp,pdp) \
((mp)->m_dirops.xd_init(tp,dp,pdp))
#define XFS_DIR_CREATENAME(mp,tp,dp,name,namelen,inum,first,flist,total) \
((mp)->m_dirops.xd_createname(tp,dp,name,namelen,inum,first,flist,\
total))
#define XFS_DIR_LOOKUP(mp,tp,dp,name,namelen,inum) \
((mp)->m_dirops.xd_lookup(tp,dp,name,namelen,inum))
#define XFS_DIR_REMOVENAME(mp,tp,dp,name,namelen,ino,first,flist,total) \
((mp)->m_dirops.xd_removename(tp,dp,name,namelen,ino,first,flist,total))
#define XFS_DIR_GETDENTS(mp,tp,dp,uio,eofp) \
((mp)->m_dirops.xd_getdents(tp,dp,uio,eofp))
#define XFS_DIR_REPLACE(mp,tp,dp,name,namelen,inum,first,flist,total) \
((mp)->m_dirops.xd_replace(tp,dp,name,namelen,inum,first,flist,total))
#define XFS_DIR_CANENTER(mp,tp,dp,name,namelen) \
((mp)->m_dirops.xd_canenter(tp,dp,name,namelen))
#define XFS_DIR_SHORTFORM_VALIDATE_ONDISK(mp,dip) \
((mp)->m_dirops.xd_shortform_validate_ondisk(mp,dip))
#define XFS_DIR_SHORTFORM_TO_SINGLE(mp,args) \
((mp)->m_dirops.xd_shortform_to_single(args))
#define XFS_DIR_IS_V1(mp) ((mp)->m_dirversion == 1)
extern xfs_dirops_t xfsv1_dirops;
#endif /* __XFS_DIR_H__ */