2 * Copyright (c) 2008 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * $DragonFly: src/sbin/hammer/misc.c,v 1.3 2008/02/05 07:58:40 dillon Exp $
40 * (taken from /usr/src/sys/vfs/hammer/hammer_btree.c)
42 * Compare two B-Tree elements, return -N, 0, or +N (e.g. similar to strcmp).
44 * Note that for this particular function a return value of -1, 0, or +1
45 * can denote a match if delete_tid is otherwise discounted. A delete_tid
46 * of zero is considered to be 'infinity' in comparisons.
48 * See also hammer_rec_rb_compare() and hammer_rec_cmp() in hammer_object.c.
51 hammer_btree_cmp(hammer_base_elm_t key1, hammer_base_elm_t key2)
53 if (key1->obj_id < key2->obj_id)
55 if (key1->obj_id > key2->obj_id)
58 if (key1->rec_type < key2->rec_type)
60 if (key1->rec_type > key2->rec_type)
63 if (key1->key < key2->key)
65 if (key1->key > key2->key)
68 if (key1->create_tid == 0) {
69 if (key2->create_tid == 0)
73 if (key2->create_tid == 0)
75 if (key1->create_tid < key2->create_tid)
77 if (key1->create_tid > key2->create_tid)