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Annotation of Net2/kern/kern_physio.c, revision 1.1.1.1

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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