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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000,2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
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 | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
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. | |
1da177e4 | 13 | * |
7b718769 NS |
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 | |
1da177e4 LT |
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 | ||
36 | struct uio; | |
37 | struct xfs_bmap_free; | |
38 | struct xfs_da_args; | |
39 | struct xfs_dinode; | |
40 | struct xfs_inode; | |
41 | struct xfs_mount; | |
42 | struct xfs_trans; | |
43 | ||
44 | /* | |
45 | * Directory function types. | |
46 | * Put in structures (xfs_dirops_t) for v1 and v2 directories. | |
47 | */ | |
48 | typedef void (*xfs_dir_mount_t)(struct xfs_mount *mp); | |
49 | typedef int (*xfs_dir_isempty_t)(struct xfs_inode *dp); | |
50 | typedef int (*xfs_dir_init_t)(struct xfs_trans *tp, | |
51 | struct xfs_inode *dp, | |
52 | struct xfs_inode *pdp); | |
53 | typedef 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); | |
61 | typedef 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); | |
66 | typedef 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); | |
74 | typedef int (*xfs_dir_getdents_t)(struct xfs_trans *tp, | |
75 | struct xfs_inode *dp, | |
76 | struct uio *uio, | |
77 | int *eofp); | |
78 | typedef 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); | |
86 | typedef int (*xfs_dir_canenter_t)(struct xfs_trans *tp, | |
87 | struct xfs_inode *dp, | |
88 | char *name, | |
89 | int namelen); | |
90 | typedef int (*xfs_dir_shortform_validate_ondisk_t)(struct xfs_mount *mp, | |
91 | struct xfs_dinode *dip); | |
92 | typedef int (*xfs_dir_shortform_to_single_t)(struct xfs_da_args *args); | |
93 | ||
94 | typedef 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 | */ | |
111 | void 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 | extern xfs_dirops_t xfsv1_dirops; | |
139 | ||
140 | #endif /* __XFS_DIR_H__ */ |