1 /* 2 * Copyright (c) 2003 Alan L. Cox <alc@cs.rice.edu>. All rights reserved. 3 * Copyright (c) 1998 David Greenman. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #ifndef _SYS_SFBUF_H_ 28 #define _SYS_SFBUF_H_ 29 30 #ifndef _SYS_TYPES_H_ 31 #include <sys/types.h> 32 #endif 33 #ifndef _CPU_LWBUF_H_ 34 #include <cpu/lwbuf.h> 35 #endif 36 37 #if !defined(_KERNEL) && !defined(_KERNEL_STRUCTURES) 38 #error "This file should not be included by userland programs." 39 #endif 40 41 struct sf_buf { 42 struct lwbuf *lwbuf; /* lightweight buffer */ 43 u_int ref; /* ref count */ 44 struct lwbuf lwbuf_cache; 45 }; 46 47 #define sf_buf_kva(sf) (lwbuf_kva((sf)->lwbuf)) 48 #define sf_buf_page(sf) (lwbuf_page((sf)->lwbuf)) 49 50 51 #if defined(_KERNEL) 52 53 struct sf_buf *sf_buf_alloc(struct vm_page *); 54 void sf_buf_ref(void *); 55 int sf_buf_free(void *); 56 57 #endif 58 59 #endif /* !_SYS_SFBUF_H_ */ 60