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
21 * latter is responsible for marking these entries as allocated. Also
22 * change the salvager. */
23 #define DHE 12 /* entries in a dir header above a pages header alone. */
28 struct MKFid { /* A file identifier. */
29 afs_int32 vnode; /* file's vnode slot */
30 afs_int32 vunique; /* the slot incarnation number */
34 /* A page header entry. */
35 unsigned short pgcount; /* number of pages, or 0 if old-style */
36 unsigned short tag; /* 1234 in network byte order */
37 char freecount; /* unused, info in dirHeader structure */
38 char freebitmap[EPP / 8];
39 char padding[32 - (5 + EPP / 8)];
48 /* A directory header object. */
49 struct PageHeader header;
50 char alloMap[MAXPAGES]; /* one byte per 2K page */
51 unsigned short hashTable[NHASHENT];
55 /* A directory entry */
57 char length; /* currently unused */
64 /* A directory extension entry. */
69 /* A page in a directory. */
70 struct DirHeader header;
71 struct DirEntry entry[1];
75 /* A page in a directory. */
76 struct PageHeader header;
77 struct DirEntry entry[1];
83 typedef struct dcache * dir_file_t;
86 typedef struct DirHandle * dir_file_t;
87 extern void Die(const char *msg) AFS_NORETURN;
90 extern int afs_dir_NameBlobs(char *name);
91 extern int afs_dir_Create(dir_file_t dir, char *entry, void *vfid);
92 extern int afs_dir_Length(dir_file_t dir);
93 extern int afs_dir_Delete(dir_file_t dir, char *entry);
94 extern int afs_dir_MakeDir(dir_file_t dir, afs_int32 * me,
96 extern int afs_dir_Lookup(dir_file_t dir, char *entry, void *fid);
97 extern int afs_dir_LookupOffset(dir_file_t dir, char *entry, void *fid,
99 extern int afs_dir_EnumerateDir(dir_file_t dir,
100 int (*hookproc) (void *, char *name,
104 extern int afs_dir_IsEmpty(dir_file_t dir);
105 extern int afs_dir_GetBlob(dir_file_t dir, afs_int32 blobno,
107 extern int afs_dir_GetVerifiedBlob(dir_file_t dir, afs_int32 blobno,
109 extern int afs_dir_DirHash(char *string);
111 extern int afs_dir_InverseLookup (void *dir, afs_uint32 vnode,
112 afs_uint32 unique, char *name,
115 extern int afs_dir_ChangeFid(dir_file_t dir, char *entry,
116 afs_uint32 *old_fid, afs_uint32 *new_fid);
118 /* buffer operations */
120 extern void DInit(int abuffers);
121 extern int DRead(dir_file_t fid, int page, struct DirBuffer *);
122 extern int DFlush(void);
123 extern int DFlushVolume(afs_int32);
124 extern int DNew(dir_file_t fid, int page, struct DirBuffer *);
125 extern void DZap(dir_file_t fid);
126 extern void DRelease(struct DirBuffer *loc, int flag);
127 extern int DStat(int *abuffers, int *acalls, int *aios);
128 extern int DFlushVolume(afs_int32 vid);
129 extern int DFlushEntry(dir_file_t fid);
130 extern int DVOffset(struct DirBuffer *);
135 extern int DirOK(void *);
136 extern int DirSalvage(void *, void *, afs_int32, afs_int32,
137 afs_int32, afs_int32);
141 #endif /* !defined(__AFS_DIR_H) */