diff options
Diffstat (limited to 'sys/vm/vnode_pager.h')
| -rw-r--r-- | sys/vm/vnode_pager.h | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/sys/vm/vnode_pager.h b/sys/vm/vnode_pager.h new file mode 100644 index 000000000000..020543576a55 --- /dev/null +++ b/sys/vm/vnode_pager.h @@ -0,0 +1,79 @@ +/* + * Copyright (c) 1990 University of Utah. + * Copyright (c) 1991 The Regents of the University of California. + * All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * the Systems Programming Group of the University of Utah Computer + * Science Department. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * from: @(#)vnode_pager.h 7.1 (Berkeley) 12/5/90 + * $Id: vnode_pager.h,v 1.2 1993/10/16 16:21:03 rgrimes Exp $ + */ + +#ifndef _VNODE_PAGER_ +#define _VNODE_PAGER_ 1 + +/* + * VNODE pager private data. + */ +struct vnpager { + int vnp_flags; /* flags */ + struct vnode *vnp_vp; /* vnode */ + vm_size_t vnp_size; /* vnode current size */ +}; +typedef struct vnpager *vn_pager_t; + +#define VN_PAGER_NULL ((vn_pager_t)0) + +#define VNP_PAGING 0x01 /* vnode used for pageout */ +#define VNP_CACHED 0x02 /* vnode is cached */ + +#ifdef KERNEL + +void vnode_pager_init(); +vm_pager_t vnode_pager_alloc(); +void vnode_pager_dealloc(); +int vnode_pager_getpage(), vnode_pager_putpage(); +boolean_t vnode_pager_haspage(); + +struct pagerops vnodepagerops = { + vnode_pager_init, + vnode_pager_alloc, + vnode_pager_dealloc, + vnode_pager_getpage, + vnode_pager_putpage, + vnode_pager_haspage +}; + +#endif + +#endif /* _VNODE_PAGER_ */ |