2 $Id: dbif.h,v 1.8 2009-09-03 08:35:15 franklahm Exp $
4 Copyright (C) Joerg Lenneis 2003
5 Copyright (C) Frank Lahm 2009
6 All Rights Reserved. See COPYING.
14 1. Provide storage for a DBD * handle
16 2. Call dbif_init with a filename to receive a DBD handle:
17 dbd = dbif_init("cnid2.db");
18 Pass NULL to create an in-memory db.
19 Note: the DBD type is NOT from BerkeleyDB ! We've defined it.
20 3. Call dbif_env_open to open an dbd environment if you called dbif_init
22 4. Call dbif_open to finally open the CNID database itself
24 Querying the CNID database
25 --------------------------
26 Call dbif_[get|pget|put|del]. They map to the corresponding BerkeleyDB calls
31 We use AUTO_COMMIT for the BDB database accesses. This avoids explicit transactions
32 for every bdb access which speeds up reads. But in order to be able to rollback
33 in case of errors we start a transaction once we encounter the first write from
35 Thus you shouldn't call dbif_txn_[begin|abort|commit], they're used internally.
39 Call dbif_txn_checkpoint.
45 Silent Upgrade Support
46 ----------------------
48 On cnid_dbd shutdown we reopen the environment with recovery, close and then
49 remove it. This enables an upgraded netatalk installation possibly linked against
50 a newer bdb lib to succesfully open/create an environment and then silently
51 upgrade the database itself. How nice!
54 #ifndef CNID_DBD_DBIF_H
55 #define CNID_DBD_DBIF_H 1
57 #include <sys/cdefs.h>
59 #include <atalk/adouble.h>
65 #define DBIF_IDX_DEVINO 1
66 #define DBIF_IDX_DIDNAME 2
80 DBC *db_cur; /* for dbif_walk */
88 extern DBD *dbif_init(const char *envhome, const char *dbname);
89 extern int dbif_env_open(DBD *dbd, struct db_param *dbp, uint32_t dbenv_oflags);
90 extern int dbif_open(DBD *dbd, struct db_param *dbp, int reindex);
91 extern int dbif_close(DBD *dbd);
92 extern int dbif_prep_upgrade(const char *path);
94 extern int dbif_get(DBD *, const int, DBT *, DBT *, u_int32_t);
95 extern int dbif_pget(DBD *, const int, DBT *, DBT *, DBT *, u_int32_t);
96 extern int dbif_put(DBD *, const int, DBT *, DBT *, u_int32_t);
97 extern int dbif_del(DBD *, const int, DBT *, u_int32_t);
98 extern int dbif_count(DBD *, const int, u_int32_t *);
99 extern int dbif_stamp(DBD *, void *, int);
100 extern int dbif_copy_rootinfokey(DBD *srcdbd, DBD *destdbd);
101 extern int dbif_txn_begin(DBD *);
102 extern int dbif_txn_commit(DBD *);
103 extern int dbif_txn_abort(DBD *);
104 extern void dbif_txn_close(DBD *dbd, int ret); /* Switch between commit+abort */
105 extern int dbif_txn_checkpoint(DBD *, u_int32_t, u_int32_t, u_int32_t);
107 extern int dbif_dump(DBD *dbd, int dumpindexes);
108 extern int dbif_idwalk(DBD *dbd, cnid_t *cnid, int close);