2 * Copyright (C) 1995-1998, Index Data
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.10 1998-10-15 13:09:31 adam
10 * Revision 1.9 1998/08/07 15:07:15 adam
11 * Fixed but in cf_commit_flat.
13 * Revision 1.8 1996/04/18 16:02:56 adam
14 * Changed logging a bit.
15 * Removed warning message when commiting flat shadow files.
17 * Revision 1.7 1996/02/07 14:03:48 adam
18 * Work on flat indexed shadow files.
20 * Revision 1.6 1996/02/07 10:08:45 adam
21 * Work on flat shadow (not finished yet).
23 * Revision 1.5 1995/12/15 12:36:52 adam
24 * Moved hash file information to union.
25 * Renamed commit files.
27 * Revision 1.4 1995/12/11 09:03:54 adam
28 * New function: cf_unlink.
29 * New member of commit file head: state (0) deleted, (1) hash file.
31 * Revision 1.3 1995/12/01 16:24:29 adam
32 * Commit files use separate meta file area.
34 * Revision 1.2 1995/12/01 11:37:23 adam
35 * Cached/commit files implemented as meta-files.
37 * Revision 1.1 1995/11/30 08:33:12 adam
38 * Started work on commit facility.
45 #define HASH_BUCKET 15
47 struct CFile_ph_bucket { /* structure on disc */
48 int no[HASH_BUCKET]; /* block number in original file */
49 int vno[HASH_BUCKET]; /* block number in shadow file */
50 int this_bucket; /* this bucket number */
51 int next_bucket; /* next bucket number */
54 struct CFile_hash_bucket {
55 struct CFile_ph_bucket ph;
57 struct CFile_hash_bucket *h_next, **h_prev;
58 struct CFile_hash_bucket *lru_next, *lru_prev;
61 #define HASH_BSIZE sizeof(struct CFile_ph_bucket)
65 typedef struct CFile_struct
68 int state; /* 1 = hash, 2 = flat */
69 int next_block; /* next free block / last block */
70 int block_size; /* mfile/bfile block size */
71 int hash_size; /* no of chains in hash table */
72 int first_bucket; /* first hash bucket */
73 int next_bucket; /* last hash bucket + 1 = first flat bucket */
74 int flat_bucket; /* last flat bucket + 1 */
79 struct CFile_hash_bucket **parray;
80 struct CFile_hash_bucket *bucket_lru_front, *bucket_lru_back;
83 int max_bucket_in_memory;
90 int cf_close (CFile cf);
91 CFile cf_open (MFile mf, MFile_area area, const char *fname, int block_size,
92 int wflag, int *firstp);
93 int cf_read (CFile cf, int no, int offset, int num, void *buf);
94 int cf_write (CFile cf, int no, int offset, int num, const void *buf);
95 void cf_unlink (CFile cf);
96 void cf_commit (CFile cf);