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Annotation of Net2/vm/vnode_pager.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1990 University of Utah.
                      3:  * Copyright (c) 1991 The Regents of the University of California.
                      4:  * All rights reserved.
                      5:  *
                      6:  * This code is derived from software contributed to Berkeley by
                      7:  * the Systems Programming Group of the University of Utah Computer
                      8:  * Science Department.
                      9:  *
                     10:  * Redistribution and use in source and binary forms, with or without
                     11:  * modification, are permitted provided that the following conditions
                     12:  * are met:
                     13:  * 1. Redistributions of source code must retain the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer.
                     15:  * 2. Redistributions in binary form must reproduce the above copyright
                     16:  *    notice, this list of conditions and the following disclaimer in the
                     17:  *    documentation and/or other materials provided with the distribution.
                     18:  * 3. All advertising materials mentioning features or use of this software
                     19:  *    must display the following acknowledgement:
                     20:  *     This product includes software developed by the University of
                     21:  *     California, Berkeley and its contributors.
                     22:  * 4. Neither the name of the University nor the names of its contributors
                     23:  *    may be used to endorse or promote products derived from this software
                     24:  *    without specific prior written permission.
                     25:  *
                     26:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     27:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     28:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     29:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     30:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     31:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     32:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     33:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     34:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     35:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     36:  * SUCH DAMAGE.
                     37:  *
                     38:  *     @(#)vnode_pager.h       7.1 (Berkeley) 12/5/90
                     39:  */
                     40: 
                     41: #ifndef        _VNODE_PAGER_
                     42: #define        _VNODE_PAGER_   1
                     43: 
                     44: /*
                     45:  * VNODE pager private data.
                     46:  */
                     47: struct vnpager {
                     48:        int             vnp_flags;      /* flags */
                     49:        struct vnode    *vnp_vp;        /* vnode */
                     50:        vm_size_t       vnp_size;       /* vnode current size */
                     51: };
                     52: typedef struct vnpager *vn_pager_t;
                     53: 
                     54: #define VN_PAGER_NULL  ((vn_pager_t)0)
                     55: 
                     56: #define        VNP_PAGING      0x01            /* vnode used for pageout */
                     57: #define VNP_CACHED     0x02            /* vnode is cached */
                     58: 
                     59: #ifdef KERNEL
                     60: 
                     61: void           vnode_pager_init();
                     62: vm_pager_t     vnode_pager_alloc();
                     63: void           vnode_pager_dealloc();
                     64: int            vnode_pager_getpage(), vnode_pager_putpage();
                     65: boolean_t      vnode_pager_haspage();
                     66: 
                     67: struct pagerops vnodepagerops = {
                     68:        vnode_pager_init,
                     69:        vnode_pager_alloc,
                     70:        vnode_pager_dealloc,
                     71:        vnode_pager_getpage,
                     72:        vnode_pager_putpage,
                     73:        vnode_pager_haspage
                     74: };
                     75: 
                     76: #endif
                     77: 
                     78: #endif /* _VNODE_PAGER_ */

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