bio.c

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    1 /*      $OpenBSD: bio.c,v 1.17 2015/08/26 22:28:57 deraadt Exp $        */
    2 
    3 /*
    4  * Copyright (c) 2002 Niklas Hallqvist.  All rights reserved.
    5  * Copyright (c) 2012 Joel Sing <jsing@openbsd.org>.  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/param.h>
   31 #include <sys/device.h>
   32 #include <sys/ioctl.h>
   33 #include <sys/malloc.h>
   34 #include <sys/queue.h>
   35 #include <sys/systm.h>
   36 
   37 #include <dev/biovar.h>
   38 
   39 struct bio_mapping {
   40         LIST_ENTRY(bio_mapping) bm_link;
   41         struct device *bm_dev;
   42         int (*bm_ioctl)(struct device *, u_long, caddr_t);
   43 };
   44 
   45 LIST_HEAD(, bio_mapping) bios = LIST_HEAD_INITIALIZER(bios);
   46 
   47 void    bioattach(int);
   48 int     bioclose(dev_t, int, int, struct proc *);
   49 int     bioioctl(dev_t, u_long, caddr_t, int, struct proc *);
   50 int     bioopen(dev_t, int, int, struct proc *);
   51 
   52 int     bio_delegate_ioctl(struct bio_mapping *, u_long, caddr_t);
   53 struct  bio_mapping *bio_lookup(char *);
   54 int     bio_validate(void *);
   55 
   56 void
   57 bioattach(int nunits)
   58 {
   59 }
   60 
   61 int
   62 bioopen(dev_t dev, int flags, int mode, struct proc *p)
   63 {
   64         return (0);
   65 }
   66 
   67 int
   68 bioclose(dev_t dev, int flags, int mode, struct proc *p)
   69 {
   70         return (0);
   71 }
   72 
   73 int
   74 bioioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p)
   75 {
   76         struct bio_locate *locate;
   77         struct bio *bio;
   78         char name[16];
   79         int error;
   80 
   81         switch (cmd) {
   82         case BIOCLOCATE:
   83                 locate = (struct bio_locate *)addr;
   84                 error = copyinstr(locate->bl_name, name, sizeof name, NULL);
   85                 if (error != 0)
   86                         return (error);
   87                 locate->bl_bio.bio_cookie = bio_lookup(name);
   88                 if (locate->bl_bio.bio_cookie == NULL)
   89                         return (ENOENT);
   90                 break;
   91 
   92         case BIOCINQ:
   93         case BIOCDISK:
   94         case BIOCVOL:
   95         case BIOCALARM:
   96         case BIOCBLINK:
   97         case BIOCSETSTATE:
   98         case BIOCCREATERAID:
   99         case BIOCDELETERAID:
  100         case BIOCDISCIPLINE:
  101         case BIOCPATROL:
  102                 bio = (struct bio *)addr;
  103                 if (!bio_validate(bio->bio_cookie))
  104                         return (ENOENT);
  105                 return (bio_delegate_ioctl(
  106                     (struct bio_mapping *)bio->bio_cookie, cmd, addr));
  107 
  108         default:
  109                 return (ENXIO);
  110         }
  111         return (0);
  112 }
  113 
  114 int
  115 bio_register(struct device *dev, int (*ioctl)(struct device *, u_long, caddr_t))
  116 {
  117         struct bio_mapping *bm;
  118 
  119         bm = malloc(sizeof *bm, M_DEVBUF, M_NOWAIT);
  120         if (bm == NULL)
  121                 return (ENOMEM);
  122         bm->bm_dev = dev;
  123         bm->bm_ioctl = ioctl;
  124         LIST_INSERT_HEAD(&bios, bm, bm_link);
  125         return (0);
  126 }
  127 
  128 void
  129 bio_unregister(struct device *dev)
  130 {
  131         struct bio_mapping *bm, *next;
  132 
  133         for (bm = LIST_FIRST(&bios); bm != NULL; bm = next) {
  134                 next = LIST_NEXT(bm, bm_link);
  135 
  136                 if (dev == bm->bm_dev) {
  137                         LIST_REMOVE(bm, bm_link);
  138                         free(bm, M_DEVBUF, sizeof(*bm));
  139                 }
  140         }
  141 }
  142 
  143 struct bio_mapping *
  144 bio_lookup(char *name)
  145 {
  146         struct bio_mapping *bm;
  147 
  148         LIST_FOREACH(bm, &bios, bm_link)
  149                 if (strcmp(name, bm->bm_dev->dv_xname) == 0)
  150                         return (bm);
  151         return (NULL);
  152 }
  153 
  154 int
  155 bio_validate(void *cookie)
  156 {
  157         struct bio_mapping *bm;
  158 
  159         LIST_FOREACH(bm, &bios, bm_link)
  160                 if (bm == cookie)
  161                         return (1);
  162         return (0);
  163 }
  164 
  165 int
  166 bio_delegate_ioctl(struct bio_mapping *bm, u_long cmd, caddr_t addr)
  167 {
  168         return (bm->bm_ioctl(bm->bm_dev, cmd, addr));
  169 }
  170 
  171 void
  172 bio_info(struct bio_status *bs, int print, const char *fmt, ...)
  173 {
  174         va_list ap;
  175 
  176         va_start(ap, fmt);
  177         bio_status(bs, print, BIO_MSG_INFO, fmt, &ap);
  178         va_end(ap);
  179 }
  180 
  181 void
  182 bio_warn(struct bio_status *bs, int print, const char *fmt, ...)
  183 {
  184         va_list ap;
  185 
  186         va_start(ap, fmt);
  187         bio_status(bs, print, BIO_MSG_WARN, fmt, &ap);
  188         va_end(ap);
  189 }
  190 
  191 void
  192 bio_error(struct bio_status *bs, int print, const char *fmt, ...)
  193 {
  194         va_list ap;
  195 
  196         va_start(ap, fmt);
  197         bio_status(bs, print, BIO_MSG_ERROR, fmt, &ap);
  198         va_end(ap);
  199 }
  200 
  201 void
  202 bio_status_init(struct bio_status *bs, struct device *dv)
  203 {
  204         bzero(bs, sizeof(struct bio_status));
  205 
  206         bs->bs_status = BIO_STATUS_UNKNOWN;
  207 
  208         strlcpy(bs->bs_controller, dv->dv_xname, sizeof(bs->bs_controller));
  209 }
  210 
  211 void
  212 bio_status(struct bio_status *bs, int print, int msg_type, const char *fmt,
  213     va_list *ap)
  214 {
  215         int idx;
  216 
  217         if (bs->bs_msg_count >= BIO_MSG_COUNT) {
  218                 printf("%s: insufficient message buffers\n", bs->bs_controller);
  219                 return;
  220         }
  221 
  222         idx = bs->bs_msg_count++;
  223 
  224         bs->bs_msgs[idx].bm_type = msg_type;
  225         vsnprintf(bs->bs_msgs[idx].bm_msg, BIO_MSG_LEN, fmt, *ap);
  226 
  227         if (print)
  228                 printf("%s: %s\n", bs->bs_controller, bs->bs_msgs[idx].bm_msg);
  229 }

Cache object: 5ef37c103efca263c4043ac8f4b56d38

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

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sys/dev/bio.c