2 * Copyright (c) 2006 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/fsck/memzone.c,v 1.2 2007/11/25 01:28:23 swildner Exp $
37 #include <sys/types.h>
46 * Efficiently allocate memory that will only be freed in bulk
49 mzalloc(struct memzone
*zone
, int bytes
)
51 struct memchunk
*chunk
;
54 if ((chunk
= zone
->curr
) != NULL
) {
55 if (bytes
> chunk
->bytes
- zone
->index
) {
56 chunk
->next
= zone
->list
;
63 chunk
= malloc(sizeof(*chunk
));
66 bzero(chunk
, sizeof(*chunk
));
67 chunk
->base
= mmap(NULL
, MEMZONE_CHUNK
, PROT_READ
|PROT_WRITE
,
68 MAP_ANON
|MAP_PRIVATE
, -1, 0);
69 if (chunk
->base
== MAP_FAILED
) {
73 chunk
->bytes
= MEMZONE_CHUNK
;
77 if (bytes
> chunk
->bytes
)
78 pfatal("allocation to large for mzalloc!");
79 ptr
= chunk
->base
+ zone
->index
;
80 zone
->index
+= (bytes
+ 7) & ~7;
88 mzpurge(struct memzone
*zone
)
90 struct memchunk
*chunk
;
92 if ((chunk
= zone
->curr
) != NULL
) {
93 chunk
->next
= zone
->list
;
97 while ((chunk
= zone
->list
) != NULL
) {
98 zone
->list
= chunk
->next
;
99 munmap(chunk
->base
, chunk
->bytes
);