2 * Copyright (c) 2007 Diomidis Spinellis
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
31 #include <sys/types.h>
46 /* Key used to store the version of the database data elements. */
47 #define VERSION_KEY "\0VERSION"
50 * Create the in-memory database, *mdb.
51 * If iflag is not set, fill-in mdb with the records of the disk-based
53 * Upgrade old-version records by calling v1_to_v2.
54 * Return 0 if OK, -1 on error.
57 db_copy_in(DB **mdb, const char *dbname, const char *uname, BTREEINFO *bti,
58 int (*v1_to_v2)(DBT *key, DBT *data))
62 int error, rv, version;
64 if ((*mdb = dbopen(NULL, O_RDWR, 0, DB_BTREE, bti)) == NULL)
70 if ((ddb = dbopen(dbname, O_RDONLY, 0, DB_BTREE, bti)) == NULL) {
73 warn("retrieving %s summary", uname);
74 db_destroy(*mdb, uname);
80 /* Obtain/set version. */
82 key.data = (void*)&VERSION_KEY;
83 key.size = sizeof(VERSION_KEY);
85 rv = DB_GET(ddb, &key, &data, 0);
87 warn("get version key from %s stats", uname);
90 } else if (rv == 0) { /* It's there; verify version. */
91 if (data.size != sizeof(version)) {
92 warnx("invalid version size %zd in %s",
97 memcpy(&version, data.data, data.size);
99 warnx("unsupported version %d in %s",
106 for (rv = DB_SEQ(ddb, &key, &data, R_FIRST); rv == 0;
107 rv = DB_SEQ(ddb, &key, &data, R_NEXT)) {
109 /* See if this is a version record. */
110 if (key.size == sizeof(VERSION_KEY) &&
111 memcmp(key.data, VERSION_KEY, sizeof(VERSION_KEY)) == 0)
114 /* Convert record from v1, if needed. */
115 if (version == 1 && v1_to_v2(&key, &data) < 0) {
116 warn("converting %s stats", uname);
121 /* Copy record to the in-memory database. */
122 if ((rv = DB_PUT(*mdb, &key, &data, 0)) < 0) {
123 warn("initializing %s stats", uname);
129 warn("retrieving %s summary", uname);
134 if (DB_CLOSE(ddb) < 0) {
135 warn("closing %s summary", uname);
140 db_destroy(*mdb, uname);
145 * Save the in-memory database mdb to the disk database dbname.
146 * Return 0 if OK, -1 on error.
149 db_copy_out(DB *mdb, const char *dbname, const char *uname, BTREEINFO *bti)
153 int error, rv, version;
155 if ((ddb = dbopen(dbname, O_RDWR|O_CREAT|O_TRUNC, 0644,
156 DB_BTREE, bti)) == NULL) {
157 warn("creating %s summary", uname);
163 for (rv = DB_SEQ(mdb, &key, &data, R_FIRST);
164 rv == 0; rv = DB_SEQ(mdb, &key, &data, R_NEXT)) {
165 if ((rv = DB_PUT(ddb, &key, &data, 0)) < 0) {
166 warn("saving %s summary", uname);
172 warn("retrieving %s stats", uname);
177 /* Add a version record. */
178 key.data = (void*)&VERSION_KEY;
179 key.size = sizeof(VERSION_KEY);
181 data.data = &version;
182 data.size = sizeof(version);
183 if ((rv = DB_PUT(ddb, &key, &data, 0)) < 0) {
184 warn("add version record to %s stats", uname);
186 } else if (rv == 1) {
187 warnx("duplicate version record in %s stats", uname);
191 if (DB_SYNC(ddb, 0) < 0) {
192 warn("syncing %s summary", uname);
195 if (DB_CLOSE(ddb) < 0) {
196 warn("closing %s summary", uname);
203 db_destroy(DB *db, const char *uname)
205 if (DB_CLOSE(db) < 0)
206 warn("destroying %s stats", uname);