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Annotation of Net2/vm/vnode_pager.h, revision 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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