2 * Copyright (c) 1998 David Greenman. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * $DragonFly: src/sys/kern/kern_sfbuf.c,v 1.15 2007/04/30 07:18:53 dillon Exp $
28 #include <sys/param.h>
29 #include <sys/types.h>
30 #include <sys/systm.h>
31 #include <sys/kernel.h>
32 #include <sys/malloc.h>
33 #include <sys/sfbuf.h>
34 #include <sys/objcache.h>
36 #include <cpu/lwbuf.h>
39 #include <vm/vm_extern.h>
40 #include <vm/vm_kern.h>
41 #include <vm/vm_page.h>
44 static void sf_buf_init(void *arg);
45 SYSINIT(sock_sf, SI_BOOT2_MACHDEP, SI_ORDER_ANY, sf_buf_init, NULL)
47 LIST_HEAD(sf_buf_list, sf_buf);
49 static struct objcache *sf_buf_cache;
51 MALLOC_DEFINE(M_SFBUF, "sfbuf", "Sendfile buffer structures");
52 struct objcache_malloc_args sf_buf_malloc_args = { sizeof(struct sf_buf), M_SFBUF };
56 sf_buf_cache_ctor(void *obj, void *pdata, int ocflags)
58 struct sf_buf *sf = (struct sf_buf *)obj;
67 * Init objcache of sf_bufs (sendfile(2) or "super-fast" if you prefer. :-))
70 sf_buf_init(void *arg)
72 sf_buf_cache = objcache_create("sf_buf", 0, 0,
73 sf_buf_cache_ctor, NULL, NULL,
74 objcache_malloc_alloc, objcache_malloc_free,
79 * Acquire an sf_buf reference for a vm_page.
82 sf_buf_alloc(struct vm_page *m)
86 if ((sf = objcache_get(sf_buf_cache, M_WAITOK)) == NULL)
89 if ((sf->lwbuf = lwbuf_alloc(m)) == NULL) {
90 objcache_put(sf_buf_cache, sf);
96 * Force invalidation of the TLB entry on all CPU's
98 lwbuf_set_global(sf->lwbuf);
107 sf_buf_ref(void *arg)
109 struct sf_buf *sf = arg;
111 atomic_add_int(&sf->refs, 1);
115 * Detach mapped page and release resources back to the system.
117 * Must be called at splimp.
120 sf_buf_free(void *arg)
122 struct sf_buf *sf = arg;
124 KKASSERT(sf->refs > 0);
125 if (atomic_fetchadd_int(&sf->refs, -1) == 1) {
126 lwbuf_free(sf->lwbuf);
127 objcache_put(sf_buf_cache, sf);