bio.c

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    1 /*      $NetBSD: bio.c,v 1.1.22.3 2007/10/15 20:37:08 riz Exp $ */
    2 /*      $OpenBSD: bio.c,v 1.9 2007/03/20 02:35:55 marco Exp $   */
    3 
    4 /*
    5  * Copyright (c) 2002 Niklas Hallqvist.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   26  */
   27 
   28 /* A device controller ioctl tunnelling device.  */
   29 
   30 #include <sys/cdefs.h>
   31 __KERNEL_RCSID(0, "$NetBSD: bio.c,v 1.1.22.3 2007/10/15 20:37:08 riz Exp $");
   32 
   33 #include <sys/param.h>
   34 #include <sys/conf.h>
   35 #include <sys/device.h>
   36 #include <sys/event.h>
   37 #include <sys/ioctl.h>
   38 #include <sys/malloc.h>
   39 #include <sys/queue.h>
   40 #include <sys/systm.h>
   41 #include <sys/proc.h>
   42 
   43 #include <dev/biovar.h>
   44 
   45 struct bio_mapping {
   46         LIST_ENTRY(bio_mapping) bm_link;
   47         struct device *bm_dev;
   48         int (*bm_ioctl)(struct device *, u_long, caddr_t);
   49 };
   50 
   51 LIST_HEAD(, bio_mapping) bios = LIST_HEAD_INITIALIZER(bios);
   52 
   53 void    bioattach(int);
   54 int     bioclose(dev_t, int, int, struct proc *);
   55 int     bioioctl(dev_t, u_long, caddr_t, int, struct proc *);
   56 int     bioopen(dev_t, int, int, struct proc *);
   57 
   58 int     bio_delegate_ioctl(struct bio_mapping *, u_long, void *);
   59 struct  bio_mapping *bio_lookup(char *);
   60 int     bio_validate(void *);
   61 
   62 const struct cdevsw bio_cdevsw = {
   63         bioopen, bioclose, noread, nowrite, bioioctl,
   64         nostop, notty, nopoll, nommap, nokqfilter, 0
   65 };
   66 
   67 
   68 void
   69 bioattach(int nunits)
   70 {
   71 }
   72 
   73 int
   74 bioopen(dev_t dev, int flags, int mode, struct proc *p)
   75 {
   76         return (0);
   77 }
   78 
   79 int
   80 bioclose(dev_t dev, int flags, int mode, struct proc *p)
   81 {
   82         return (0);
   83 }
   84 
   85 int
   86 bioioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct  proc *p)
   87 {
   88         struct bio_locate *locate;
   89         struct bio_common *common;
   90         char name[16];
   91         int error;
   92 
   93         switch(cmd) {
   94         case BIOCLOCATE:
   95         case BIOCINQ:
   96         case BIOCDISK:
   97         case BIOCVOL:
   98         case BIOCBLINK:
   99         case BIOCSETSTATE:
  100         case BIOCALARM:
  101                 break;
  102         default:
  103                 return ENOTTY;
  104         }
  105 
  106         switch (cmd) {
  107         case BIOCLOCATE:
  108                 locate = (struct bio_locate *)addr;
  109                 error = copyinstr(locate->bl_name, name, 16, NULL);
  110                 if (error != 0)
  111                         return (error);
  112                 locate->bl_cookie = bio_lookup(name);
  113                 if (locate->bl_cookie == NULL)
  114                         return (ENOENT);
  115                 break;
  116 
  117         default:
  118                 common = (struct bio_common *)addr;
  119                 if (!bio_validate(common->bc_cookie)) {
  120                         return (ENOENT);
  121                 }
  122                 error =  bio_delegate_ioctl(
  123                     (struct bio_mapping *)common->bc_cookie, cmd, addr);
  124                 return (error);
  125         }
  126         return (0);
  127 }
  128 
  129 int
  130 bio_register(struct device *dev, int (*ioctl)(struct device *, u_long, caddr_t))
  131 {
  132         struct bio_mapping *bm;
  133 
  134         MALLOC(bm, struct bio_mapping *, sizeof *bm, M_DEVBUF, M_NOWAIT);
  135         if (bm == NULL)
  136                 return (ENOMEM);
  137         bm->bm_dev = dev;
  138         bm->bm_ioctl = ioctl;
  139         LIST_INSERT_HEAD(&bios, bm, bm_link);
  140         return (0);
  141 }
  142 
  143 void
  144 bio_unregister(struct device *dev)
  145 {
  146         struct bio_mapping *bm, *next;
  147 
  148         for (bm = LIST_FIRST(&bios); bm != NULL; bm = next) {
  149                 next = LIST_NEXT(bm, bm_link);
  150 
  151                 if (dev == bm->bm_dev) {
  152                         LIST_REMOVE(bm, bm_link);
  153                         free(bm, M_DEVBUF);
  154                 }
  155         }
  156 }
  157 
  158 struct bio_mapping *
  159 bio_lookup(char *name)
  160 {
  161         struct bio_mapping *bm;
  162 
  163         LIST_FOREACH(bm, &bios, bm_link) {
  164                 if (strcmp(name, bm->bm_dev->dv_xname) == 0) {
  165                         return (bm);
  166                 }
  167         }
  168         return (NULL);
  169 }
  170 
  171 int
  172 bio_validate(void *cookie)
  173 {
  174         struct bio_mapping *bm;
  175 
  176         LIST_FOREACH(bm, &bios, bm_link) {
  177                 if (bm == cookie) {
  178                         return (1);
  179                 }
  180         }
  181         return (0);
  182 }
  183 
  184 int
  185 bio_delegate_ioctl(struct bio_mapping *bm, u_long cmd, void *addr)
  186 {
  187         
  188         return (bm->bm_ioctl(bm->bm_dev, cmd, addr));
  189 }

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FreeBSD/Linux Kernel Cross Reference sys/dev/bio.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/bio.c