mirror of
https://git.FreeBSD.org/src.git
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3abe4a80a5
Sponsored by: DARPA & NAI Labs.
412 lines
10 KiB
C
412 lines
10 KiB
C
/*-
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* Copyright (c) 2002 Poul-Henning Kamp
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* Copyright (c) 2002 Networks Associates Technology, Inc.
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project by Poul-Henning Kamp
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* and NAI Labs, the Security Research Division of Network Associates, Inc.
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* under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
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* DARPA CHATS research program.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The names of the authors may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/kernel.h>
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#include <sys/conf.h>
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#include <sys/bio.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/errno.h>
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#include <sys/time.h>
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#include <sys/disk.h>
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#include <sys/fcntl.h>
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#include <geom/geom.h>
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#include <geom/geom_int.h>
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#include <machine/limits.h>
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#define CDEV_MAJOR 4
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static d_open_t g_dev_open;
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static d_close_t g_dev_close;
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static d_strategy_t g_dev_strategy;
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static d_ioctl_t g_dev_ioctl;
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static d_psize_t g_dev_psize;
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static struct cdevsw g_dev_cdevsw = {
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/* open */ g_dev_open,
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/* close */ g_dev_close,
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/* read */ physread,
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/* write */ physwrite,
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/* ioctl */ g_dev_ioctl,
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/* poll */ nopoll,
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/* mmap */ nommap,
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/* strategy */ g_dev_strategy,
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/* name */ "g_dev",
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/* maj */ CDEV_MAJOR,
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/* dump */ nodump,
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/* psize */ g_dev_psize,
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/* flags */ D_DISK | D_CANFREE | D_TRACKCLOSE,
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};
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static g_taste_t g_dev_taste;
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static g_orphan_t g_dev_orphan;
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static struct g_class g_dev_class = {
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"DEV",
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g_dev_taste,
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NULL,
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G_CLASS_INITSTUFF
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};
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static void
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g_dev_clone(void *arg, char *name, int namelen, dev_t *dev)
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{
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struct g_geom *gp;
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if (*dev != NODEV)
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return;
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g_trace(G_T_TOPOLOGY, "g_dev_clone(%s)", name);
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g_rattle();
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/* XXX: can I drop Giant here ??? */
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/* g_topology_lock(); */
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LIST_FOREACH(gp, &g_dev_class.geom, geom) {
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if (strcmp(gp->name, name))
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continue;
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*dev = gp->softc;
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g_trace(G_T_TOPOLOGY, "g_dev_clone(%s) = %p", name, *dev);
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return;
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}
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/* g_topology_unlock(); */
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return;
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}
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static void
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g_dev_register_cloner(void *foo __unused)
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{
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static int once;
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/* XXX: why would this happen more than once ?? */
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if (!once) {
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EVENTHANDLER_REGISTER(dev_clone, g_dev_clone, 0, 1000);
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once++;
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}
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}
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SYSINIT(geomdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE,g_dev_register_cloner,NULL);
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static struct g_geom *
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g_dev_taste(struct g_class *mp, struct g_provider *pp, int insist __unused)
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{
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struct g_geom *gp;
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struct g_consumer *cp;
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static int unit;
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int error;
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dev_t dev;
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g_trace(G_T_TOPOLOGY, "dev_taste(%s,%s)", mp->name, pp->name);
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g_topology_assert();
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LIST_FOREACH(cp, &pp->consumers, consumers)
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if (cp->geom->class == mp)
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return (NULL);
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gp = g_new_geomf(mp, pp->name);
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gp->orphan = g_dev_orphan;
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cp = g_new_consumer(gp);
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error = g_attach(cp, pp);
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KASSERT(error == 0,
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("g_dev_taste(%s) failed to g_attach, err=%d", pp->name, error));
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/*
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* XXX: I'm not 100% sure we can call make_dev(9) without Giant
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* yet. Once we can, we don't need to drop topology here either.
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*/
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g_topology_unlock();
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mtx_lock(&Giant);
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dev = make_dev(&g_dev_cdevsw, unit2minor(unit++),
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UID_ROOT, GID_WHEEL, 0600, gp->name);
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mtx_unlock(&Giant);
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g_topology_lock();
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gp->softc = dev;
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dev->si_drv1 = gp;
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dev->si_drv2 = cp;
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return (gp);
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}
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static int
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g_dev_open(dev_t dev, int flags, int fmt, struct thread *td)
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{
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struct g_geom *gp;
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struct g_consumer *cp;
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int error, r, w, e;
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gp = dev->si_drv1;
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cp = dev->si_drv2;
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if (gp == NULL || cp == NULL)
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return(ENXIO);
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g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)",
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gp->name, flags, fmt, td);
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DROP_GIANT();
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g_topology_lock();
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g_silence();
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r = flags & FREAD ? 1 : 0;
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w = flags & FWRITE ? 1 : 0;
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e = flags & O_EXCL ? 1 : 0;
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error = g_access_rel(cp, r, w, e);
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g_topology_unlock();
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PICKUP_GIANT();
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g_rattle();
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return(error);
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}
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static int
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g_dev_close(dev_t dev, int flags, int fmt, struct thread *td)
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{
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struct g_geom *gp;
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struct g_consumer *cp;
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int error, r, w, e;
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gp = dev->si_drv1;
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cp = dev->si_drv2;
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if (gp == NULL || cp == NULL)
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return(ENXIO);
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g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)",
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gp->name, flags, fmt, td);
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DROP_GIANT();
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g_topology_lock();
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g_silence();
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r = flags & FREAD ? -1 : 0;
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w = flags & FWRITE ? -1 : 0;
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e = flags & O_EXCL ? -1 : 0;
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error = g_access_rel(cp, r, w, e);
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g_topology_unlock();
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PICKUP_GIANT();
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g_rattle();
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return (error);
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}
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static int
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g_dev_ioctl(dev_t dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
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{
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struct g_geom *gp, *gp2;
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struct g_consumer *cp;
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struct g_provider *pp2;
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struct g_kerneldump kd;
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int i, error;
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u_int u;
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struct g_ioctl *gio;
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struct sbuf *usb, *sb;
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gp = dev->si_drv1;
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cp = dev->si_drv2;
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pp2 = cp->provider;
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gp2 = pp2->geom;
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error = 0;
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DROP_GIANT();
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i = IOCPARM_LEN(cmd);
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switch (cmd) {
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case DIOCGSECTORSIZE:
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error = g_io_getattr("GEOM::sectorsize", cp, &i, data);
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break;
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case DIOCGMEDIASIZE:
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error = g_io_getattr("GEOM::mediasize", cp, &i, data);
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break;
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case DIOCGFWSECTORS:
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error = g_io_getattr("GEOM::fwsectors", cp, &i, data);
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break;
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case DIOCGFWHEADS:
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error = g_io_getattr("GEOM::fwheads", cp, &i, data);
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break;
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case DIOCGFRONTSTUFF:
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error = g_io_getattr("GEOM::frontstuff", cp, &i, data);
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break;
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case DIOCSKERNELDUMP:
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u = *((u_int *)data);
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if (!u) {
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set_dumper(NULL);
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error = 0;
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break;
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}
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kd.offset = 0;
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kd.length = OFF_MAX;
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i = sizeof kd;
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error = g_io_getattr("GEOM::kerneldump", cp, &i, &kd);
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if (!error)
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dev->si_flags |= SI_DUMPDEV;
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break;
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case GEOMGETCONF:
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/* we bogusly pass cp to avoid getting any consumers listed */
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sb = g_conf_specific(gp2->class, gp2, pp2, cp);
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usb = (struct sbuf *)data;
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if (usb->s_size - 1 < sbuf_len(sb))
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error = ENOMEM;
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else
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error = copyout(sbuf_data(sb), usb->s_buf, sbuf_len(sb) + 1);
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if (!error)
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usb->s_len = sbuf_len(sb);
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break;
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default:
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gio = g_malloc(sizeof *gio, M_WAITOK);
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gio->cmd = cmd;
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gio->data = data;
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gio->fflag = fflag;
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gio->td = td;
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i = sizeof *gio;
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if (cmd & IOC_IN)
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error = g_io_setattr("GEOM::ioctl", cp, i, gio);
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else
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error = g_io_getattr("GEOM::ioctl", cp, &i, gio);
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g_free(gio);
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break;
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}
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if (error != 0 && cmd == DIOCGDVIRGIN) {
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g_topology_lock();
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gp = g_create_geomf("BSD", cp->provider, NULL);
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g_topology_unlock();
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}
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PICKUP_GIANT();
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g_rattle();
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if (error == ENOIOCTL) {
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i = IOCGROUP(cmd);
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printf("IOCTL(0x%lx) \"%s\"", cmd, gp->name);
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if (i > ' ' && i <= '~')
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printf(" '%c'", (int)IOCGROUP(cmd));
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else
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printf(" 0x%lx", IOCGROUP(cmd));
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printf("/%ld ", cmd & 0xff);
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if (cmd & IOC_IN)
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printf("I");
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if (cmd & IOC_OUT)
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printf("O");
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printf("(%ld) = ENOIOCTL\n", IOCPARM_LEN(cmd));
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error = ENOTTY;
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}
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return (error);
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}
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static int
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g_dev_psize(dev_t dev)
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{
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struct g_consumer *cp;
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int i, error;
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off_t mediasize;
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cp = dev->si_drv2;
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i = sizeof mediasize;
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error = g_io_getattr("GEOM::mediasize", cp, &i, &mediasize);
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if (error)
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return (-1);
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return (mediasize >> DEV_BSHIFT);
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}
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static void
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g_dev_done(struct bio *bp2)
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{
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struct bio *bp;
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bp = bp2->bio_linkage;
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bp->bio_error = bp2->bio_error;
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if (bp->bio_error != 0) {
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g_trace(G_T_BIO, "g_dev_done(%p) had error %d",
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bp2, bp->bio_error);
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bp->bio_flags |= BIO_ERROR;
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} else {
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g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %lld",
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bp2, bp, bp->bio_resid, bp2->bio_completed);
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}
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bp->bio_resid = bp->bio_bcount - bp2->bio_completed;
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g_destroy_bio(bp2);
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mtx_lock(&Giant);
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biodone(bp);
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mtx_unlock(&Giant);
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}
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static void
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g_dev_strategy(struct bio *bp)
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{
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struct g_geom *gp;
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struct g_consumer *cp;
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struct bio *bp2;
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dev_t dev;
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dev = bp->bio_dev;
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gp = dev->si_drv1;
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cp = dev->si_drv2;
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bp2 = g_clone_bio(bp);
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bp2->bio_offset = (off_t)bp->bio_blkno << DEV_BSHIFT;
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bp2->bio_length = (off_t)bp->bio_bcount;
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bp2->bio_done = g_dev_done;
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g_trace(G_T_BIO,
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"g_dev_strategy(%p/%p) offset %lld length %lld data %p cmd %d",
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bp, bp2, bp->bio_offset, bp2->bio_length, bp2->bio_data,
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bp2->bio_cmd);
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g_io_request(bp2, cp);
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}
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/*
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* g_dev_orphan()
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*
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* Called from below when the provider orphaned us. It is our responsibility
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* to get the access counts back to zero, until we do so the stack below will
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* not unravel. We must clear the kernel-dump settings, if this is the
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* current dumpdev. We call destroy_dev(9) to send our dev_t the way of
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* punched cards and if we have non-zero access counts, we call down with
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* them negated before we detattch and selfdestruct.
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*/
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static void
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g_dev_orphan(struct g_consumer *cp)
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{
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struct g_geom *gp;
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dev_t dev;
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gp = cp->geom;
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g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, gp->name);
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g_topology_assert();
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if (cp->biocount > 0)
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return;
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dev = gp->softc;
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if (dev->si_flags & SI_DUMPDEV)
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set_dumper(NULL);
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/* XXX: we may need Giant for now */
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destroy_dev(dev);
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if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0)
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g_access_rel(cp, -cp->acr, -cp->acw, -cp->ace);
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g_dettach(cp);
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g_destroy_consumer(cp);
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g_destroy_geom(gp);
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}
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DECLARE_GEOM_CLASS(g_dev_class, g_dev);
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