1 /* $NetBSD: bt_get.c,v 1.13 2008/09/11 12:58:00 joerg Exp $ */ 2 3 /*- 4 * Copyright (c) 1990, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Mike Olson. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #if HAVE_NBTOOL_CONFIG_H 36 #include "nbtool_config.h" 37 #endif 38 39 #include <sys/cdefs.h> 40 __RCSID("$NetBSD: bt_get.c,v 1.13 2008/09/11 12:58:00 joerg Exp $"); 41 42 #include "namespace.h" 43 #include <sys/types.h> 44 45 #include <assert.h> 46 #include <errno.h> 47 #include <stddef.h> 48 #include <stdio.h> 49 50 #include <db.h> 51 #include "btree.h" 52 53 /* 54 * __BT_GET -- Get a record from the btree. 55 * 56 * Parameters: 57 * dbp: pointer to access method 58 * key: key to find 59 * data: data to return 60 * flag: currently unused 61 * 62 * Returns: 63 * RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key not found. 64 */ 65 int 66 __bt_get(const DB *dbp, const DBT *key, DBT *data, u_int flags) 67 { 68 BTREE *t; 69 EPG *e; 70 int exact, status; 71 72 t = dbp->internal; 73 74 /* Toss any page pinned across calls. */ 75 if (t->bt_pinned != NULL) { 76 mpool_put(t->bt_mp, t->bt_pinned, 0); 77 t->bt_pinned = NULL; 78 } 79 80 /* Get currently doesn't take any flags. */ 81 if (flags) { 82 errno = EINVAL; 83 return (RET_ERROR); 84 } 85 86 if ((e = __bt_search(t, key, &exact)) == NULL) 87 return (RET_ERROR); 88 if (!exact) { 89 mpool_put(t->bt_mp, e->page, 0); 90 return (RET_SPECIAL); 91 } 92 93 status = __bt_ret(t, e, NULL, NULL, data, &t->bt_rdata, 0); 94 95 /* 96 * If the user is doing concurrent access, we copied the 97 * key/data, toss the page. 98 */ 99 if (F_ISSET(t, B_DB_LOCK)) 100 mpool_put(t->bt_mp, e->page, 0); 101 else 102 t->bt_pinned = e->page; 103 return (status); 104 } 105