2 * Copyright 2000, International Business Machines Corporation and others.
5 * This software has been released under the terms of the IBM Public
6 * License. For details, see the LICENSE file in the top-level source
7 * directory or online at http://www.openafs.org/dl/license10.html
10 #if !defined(__AFS_DIR_H)
14 #define AFS_PAGESIZE 2048 /* bytes per page */
15 #define NHASHENT 128 /* entries in the hash tbl */
16 #define MAXPAGES 128 /* max pages in a dir */
17 #define BIGMAXPAGES 1023 /* new big max pages */
18 #define EPP 64 /* dir entries per page */
19 #define LEPP 6 /* log above */
20 /* When this next field changs, it is crucial to modify MakeDir, since the latter is responsible for marking these entries as allocated. Also change the salvager. */
21 #define DHE 12 /* entries in a dir header above a pages header alone. */
26 struct MKFid { /* A file identifier. */
27 afs_int32 vnode; /* file's vnode slot */
28 afs_int32 vunique; /* the slot incarnation number */
32 /* A page header entry. */
33 unsigned short pgcount; /* number of pages, or 0 if old-style */
34 unsigned short tag; /* 1234 in network byte order */
35 char freecount; /* unused, info in dirHeader structure */
36 char freebitmap[EPP / 8];
37 char padding[32 - (5 + EPP / 8)];
41 /* A directory header object. */
42 struct PageHeader header;
43 char alloMap[MAXPAGES]; /* one byte per 2K page */
44 unsigned short hashTable[NHASHENT];
48 /* A directory entry */
50 char length; /* currently unused */
57 /* A directory extension entry. */
62 /* A page in a directory. */
63 struct DirHeader header;
64 struct DirEntry entry[1];
68 /* A page in a directory. */
69 struct PageHeader header;
70 struct DirEntry entry[1];
74 * Note that this declaration is seen in both the kernel code and the
75 * user space code. One implementation is in afs/afs_buffer.c; the
76 * other is in dir/buffer.c.
78 extern int DVOffset(void *ap);
81 /* This is private to buffer.c */
85 extern int NameBlobs(char *name);
86 extern int Create(void *dir, char *entry, void *vfid);
87 extern int Length(void *dir);
88 extern int Delete(void *dir, char *entry);
89 extern int FindBlobs(void *dir, int nblobs);
90 extern void AddPage(void *dir, int pageno);
91 extern void FreeBlobs(void *dir, register int firstblob, int nblobs);
92 extern int MakeDir(void *dir, afs_int32 * me, afs_int32 * parent);
93 extern int Lookup(void *dir, char *entry, void *fid);
94 extern int LookupOffset(void *dir, char *entry, void *fid, long *offsetp);
95 extern int EnumerateDir(void *dir,
96 int (*hookproc) (void *dir, char *name,
97 afs_int32 vnode, afs_int32 unique),
99 extern int IsEmpty(void *dir);
100 extern struct DirEntry *GetBlob(void *dir, afs_int32 blobno);
101 extern int DirHash(register char *string);
103 extern int DStat(int *abuffers, int *acalls, int *aios);
104 extern void DRelease();
105 extern int DVOffset(register void *ap);
106 extern int DFlushVolume(register afs_int32 vid);
107 extern int DFlushEntry(register afs_int32 *fid);
109 /* The kernel uses different versions of these, and prototypes them
110 in afs_prototypes.h */
112 extern int DInit(int abuffers);
113 extern void *DRead();
115 extern void *DNew(register afs_int32 *fid, register int page);
116 extern void DZap(register afs_int32 *fid);
120 extern int afs_dir_NameBlobs(char *name);
121 extern int afs_dir_Create(void *dir, char *entry, void *vfid);
122 extern int afs_dir_Length(void *dir);
123 extern int afs_dir_Delete(void *dir, char *entry);
124 extern int afs_dir_MakeDir(void *dir, afs_int32 * me, afs_int32 * parent);
125 extern int afs_dir_Lookup(void *dir, char *entry, void *fid);
126 extern int afs_dir_LookupOffset(void *dir, char *entry, void *fid,
128 extern int afs_dir_EnumerateDir(void *dir,
129 int (*hookproc) (void *dir, char *name,
133 extern int afs_dir_IsEmpty(void *dir);
134 extern struct DirEntry *afs_dir_GetBlob(void *dir, afs_int32 blobno);
137 #endif /* !defined(__AFS_DIR_H) */