The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/geom/geom_ctl.c

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    1 /*-
    2  * Copyright (c) 2002 Poul-Henning Kamp
    3  * Copyright (c) 2002 Networks Associates Technology, Inc.
    4  * All rights reserved.
    5  *
    6  * This software was developed for the FreeBSD Project by Poul-Henning Kamp
    7  * and NAI Labs, the Security Research Division of Network Associates, Inc.
    8  * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
    9  * DARPA CHATS research program.
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  * 3. The names of the authors may not be used to endorse or promote
   20  *    products derived from this software without specific prior written
   21  *    permission.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   33  * SUCH DAMAGE.
   34  *
   35  * $FreeBSD: src/sys/geom/geom_ctl.c,v 1.5 2002/11/06 20:05:15 phk Exp $
   36  */
   37 
   38 #include "opt_geom.h"
   39 
   40 #include <sys/param.h>
   41 #include <sys/systm.h>
   42 #include <sys/kernel.h>
   43 #include <sys/sysctl.h>
   44 #include <sys/bio.h>
   45 #include <sys/conf.h>
   46 #include <sys/disk.h>
   47 #include <sys/malloc.h>
   48 #include <sys/sysctl.h>
   49 #include <sys/stdint.h>
   50 
   51 #include <sys/lock.h>
   52 #include <sys/mutex.h>
   53 #include <geom/geom.h>
   54 #include <geom/geom_int.h>
   55 
   56 static g_access_t g_ctl_access;
   57 static g_start_t g_ctl_start;
   58 static void g_ctl_init(void);
   59 static d_ioctl_t g_ctl_ioctl;
   60 
   61 struct g_class g_ctl_class = {
   62         "GEOMCTL",
   63         NULL,
   64         NULL,
   65         G_CLASS_INITIALIZER
   66 };
   67 
   68 DECLARE_GEOM_CLASS_INIT(g_ctl_class, g_ctl, g_ctl_init);
   69 
   70 /*
   71  * We cannot do create our geom.ctl geom/provider in g_ctl_init() because
   72  * the event thread has to finish adding our class first and that doesn't
   73  * happen until later.  We know however, that the events are processed in
   74  * FIFO order, so scheduling g_ctl_init2() with g_call_me() is safe.
   75  */
   76 
   77 static void
   78 g_ctl_init2(void *p __unused)
   79 {
   80         struct g_geom *gp;
   81         struct g_provider *pp;
   82 
   83         g_topology_assert();
   84         gp = g_new_geomf(&g_ctl_class, "geom.ctl");
   85         gp->start = g_ctl_start;
   86         gp->access = g_ctl_access;
   87         pp = g_new_providerf(gp, "%s", gp->name);
   88         pp->sectorsize = 512;
   89         g_error_provider(pp, 0);
   90 }
   91 
   92 static void
   93 g_ctl_init(void)
   94 {
   95         mtx_unlock(&Giant);
   96         g_add_class(&g_ctl_class);
   97         g_call_me(g_ctl_init2, NULL);
   98         mtx_lock(&Giant);
   99 }
  100 
  101 /*
  102  * We allow any kind of access.  Access control is handled at the devfs
  103  * level.
  104  */
  105 
  106 static int
  107 g_ctl_access(struct g_provider *pp, int r, int w, int e)
  108 {
  109         int error;
  110 
  111         g_trace(G_T_ACCESS, "g_ctl_access(%s, %d, %d, %d)",
  112             pp->name, r, w, e);
  113 
  114         g_topology_assert();
  115         error = 0;
  116         return (error);
  117 }
  118 
  119 static void
  120 g_ctl_start(struct bio *bp)
  121 {
  122         struct g_ioctl *gio;
  123         int error;
  124 
  125         switch(bp->bio_cmd) {
  126         case BIO_DELETE:
  127         case BIO_READ:
  128         case BIO_WRITE:
  129                 error = EOPNOTSUPP;
  130                 break;
  131         case BIO_GETATTR:
  132         case BIO_SETATTR:
  133                 if (strcmp(bp->bio_attribute, "GEOM::ioctl") ||
  134                     bp->bio_length != sizeof *gio) {
  135                         error = EOPNOTSUPP;
  136                         break;
  137                 }
  138                 gio = (struct g_ioctl *)bp->bio_data;
  139                 gio->func = g_ctl_ioctl;
  140                 error = EDIRIOCTL;
  141                 break;
  142         default:
  143                 error = EOPNOTSUPP;
  144                 break;
  145         }
  146         g_io_deliver(bp, error);
  147         return;
  148 }
  149 
  150 /*
  151  * All the stuff above is really just needed to get to the stuff below
  152  */
  153 
  154 static int
  155 g_ctl_ioctl_configgeom(dev_t dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
  156 {
  157         struct geomconfiggeom *gcp;
  158         struct g_configargs ga;
  159         int error;
  160 
  161         error = 0;
  162         bzero(&ga, sizeof ga);
  163         gcp = (struct geomconfiggeom *)data;
  164         ga.class = g_idclass(&gcp->class);
  165         if (ga.class == NULL)
  166                 return (EINVAL);
  167         if (ga.class->config == NULL)
  168                 return (EOPNOTSUPP);
  169         ga.geom = g_idgeom(&gcp->geom);
  170         ga.provider = g_idprovider(&gcp->provider);
  171         ga.len = gcp->len;
  172         if (gcp->len > 64 * 1024)
  173                 return (EINVAL);
  174         else if (gcp->len == 0) {
  175                 ga.ptr = NULL;
  176         } else {
  177                 ga.ptr = g_malloc(gcp->len, M_WAITOK);
  178                 error = copyin(gcp->ptr, ga.ptr, gcp->len);
  179                 if (error) {
  180                         g_free(ga.ptr);
  181                         return (error);
  182                 }
  183         }
  184         ga.flag = gcp->flag;
  185         error = ga.class->config(&ga);
  186         if (gcp->len != 0)
  187                 copyout(ga.ptr, gcp->ptr, gcp->len);    /* Ignore error */
  188         gcp->class.u.id = (uintptr_t)ga.class;
  189         gcp->class.len = 0;
  190         gcp->geom.u.id = (uintptr_t)ga.geom;
  191         gcp->geom.len = 0;
  192         gcp->provider.u.id = (uintptr_t)ga.provider;
  193         gcp->provider.len = 0;
  194         return(error);
  195 }
  196 
  197 static int
  198 g_ctl_ioctl(dev_t dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
  199 {
  200         int error;
  201 
  202         DROP_GIANT();
  203         g_topology_lock();
  204         switch(cmd) {
  205         case GEOMCONFIGGEOM:
  206                 error = g_ctl_ioctl_configgeom(dev, cmd, data, fflag, td);
  207                 break;
  208         default:
  209                 error = ENOTTY;
  210                 break;
  211         }
  212         g_topology_unlock();
  213         PICKUP_GIANT();
  214         return (error);
  215 
  216 }

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