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/cache.c,v 1.5 2008/05/16 18:39:03 dillon Exp $
37 #include <sys/types.h>
46 #include "hammer_util.h"
49 static int CacheMax = 16 * 1024 * 1024;
51 static TAILQ_HEAD(, cache_info) CacheList = TAILQ_HEAD_INITIALIZER(CacheList);
54 hammer_cache_set(int bytes)
60 hammer_cache_add(struct cache_info *cache, enum cache_type type)
62 TAILQ_INSERT_HEAD(&CacheList, cache, entry);
64 CacheUse += HAMMER_BUFSIZE;
69 hammer_cache_del(struct cache_info *cache)
71 TAILQ_REMOVE(&CacheList, cache, entry);
72 CacheUse -= HAMMER_BUFSIZE;
77 hammer_cache_used(struct cache_info *cache)
79 TAILQ_REMOVE(&CacheList, cache, entry);
80 TAILQ_INSERT_TAIL(&CacheList, cache, entry);
84 hammer_cache_flush(void)
86 struct cache_info *cache;
90 if (CacheUse >= CacheMax) {
91 target = CacheMax / 2;
92 while ((cache = TAILQ_FIRST(&CacheList)) != NULL) {
95 TAILQ_REMOVE(&CacheList, cache, entry);
96 TAILQ_INSERT_TAIL(&CacheList, cache, entry);
99 if (count >= NCache) {
100 CacheMax += 8 * 1024 * 1024;
101 target = CacheMax / 2;
108 switch(cache->type) {
110 rel_volume(cache->u.volume);
113 rel_buffer(cache->u.buffer);
116 errx(1, "hammer_cache_flush: unknown type: %d",
121 /* structure was freed */
122 if (CacheUse < target)