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Annotation of Net2/kern/kern_physio.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1986, 1990 Regents of the University of California.
        !             3:  * 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:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Berkeley and its contributors.
        !            17:  * 4. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  *
        !            33:  *     from: @(#)kern_physio.c 7.20 (Berkeley) 5/11/91
        !            34:  */
        !            35: 
        !            36: #include "param.h"
        !            37: #include "systm.h"
        !            38: #include "buf.h"
        !            39: #include "conf.h"
        !            40: #include "proc.h"
        !            41: #include "seg.h"
        !            42: #include "trace.h"
        !            43: #include "map.h"
        !            44: #include "vnode.h"
        !            45: #include "specdev.h"
        !            46: 
        !            47: #ifdef HPUXCOMPAT
        !            48: #include "user.h"
        !            49: #endif
        !            50: 
        !            51: /*
        !            52:  * This routine does raw device I/O for a user process.
        !            53:  *
        !            54:  * If the user has the proper access privileges, the process is
        !            55:  * marked 'delayed unlock' and the pages involved in the I/O are
        !            56:  * faulted and locked. After the completion of the I/O, the pages
        !            57:  * are unlocked.
        !            58:  */
        !            59: physio(strat, bp, dev, rw, mincnt, uio)
        !            60:        int (*strat)(); 
        !            61:        register struct buf *bp;
        !            62:        dev_t dev;
        !            63:        int rw;
        !            64:        u_int (*mincnt)();
        !            65:        struct uio *uio;
        !            66: {
        !            67: 
        !            68:        /*
        !            69:         * Body deleted.
        !            70:         */
        !            71:        return (EIO);
        !            72: }
        !            73: 
        !            74: /*
        !            75:  * Calculate the maximum size of I/O request that can be requested
        !            76:  * in a single operation. This limit is necessary to prevent a single
        !            77:  * process from being able to lock more than a fixed amount of memory
        !            78:  * in the kernel.
        !            79:  */
        !            80: u_int
        !            81: minphys(bp)
        !            82:        struct buf *bp;
        !            83: {
        !            84: 
        !            85:        /*
        !            86:         * Body deleted.
        !            87:         */
        !            88:        return;
        !            89: }
        !            90: 
        !            91: /*
        !            92:  * Do a read on a device for a user process.
        !            93:  */
        !            94: rawread(dev, uio)
        !            95:        dev_t dev;
        !            96:        struct uio *uio;
        !            97: {
        !            98:        return (physio(cdevsw[major(dev)].d_strategy, (struct buf *)NULL,
        !            99:            dev, B_READ, minphys, uio));
        !           100: }
        !           101: 
        !           102: /*
        !           103:  * Do a write on a device for a user process.
        !           104:  */
        !           105: rawwrite(dev, uio)
        !           106:        dev_t dev;
        !           107:        struct uio *uio;
        !           108: {
        !           109:        return (physio(cdevsw[major(dev)].d_strategy, (struct buf *)NULL,
        !           110:            dev, B_WRITE, minphys, uio));
        !           111: }

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