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freebsd-nq/sys/geom/geom_dev.c
Poul-Henning Kamp 95c24b31df Make kernel dumps work with GEOM. 
Notice that if the device on which the dump is set is destroyed for
any reason, the dump setting is lost.  This in particular will
happen in the case of spoilage.  For instance if you set dump on
ad0s1b and open ad0 for writing, ad0s* will be spoilt and the dump
setting lost.  See geom(4) for more about spoiling.

Sponsored by: DARPA & NAI Labs.
2002-04-19 09:24:12 +00:00

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/*-
* Copyright (c) 2002 Poul-Henning Kamp
* Copyright (c) 2002 Networks Associates Technology, Inc.
* All rights reserved.
*
* This software was developed for the FreeBSD Project by Poul-Henning Kamp
* and NAI Labs, the Security Research Division of Network Associates, Inc.
* under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
* DARPA CHATS research program.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The names of the authors may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/conf.h>
#include <sys/bio.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/errno.h>
#include <sys/time.h>
#include <sys/disk.h>
#include <sys/fcntl.h>
#include <geom/geom.h>
#include <machine/limits.h>
#define CDEV_MAJOR 4
static d_open_t g_dev_open;
static d_close_t g_dev_close;
static d_strategy_t g_dev_strategy;
static d_ioctl_t g_dev_ioctl;
static d_psize_t g_dev_psize;
static struct cdevsw g_dev_cdevsw = {
/* open */ g_dev_open,
/* close */ g_dev_close,
/* read */ physread,
/* write */ physwrite,
/* ioctl */ g_dev_ioctl,
/* poll */ nopoll,
/* mmap */ nommap,
/* strategy */ g_dev_strategy,
/* name */ "g_dev",
/* maj */ CDEV_MAJOR,
/* dump */ nodump,
/* psize */ g_dev_psize,
/* flags */ D_DISK | D_CANFREE | D_TRACKCLOSE,
};
static g_taste_t g_dev_taste;
static g_orphan_t g_dev_orphan;
static struct g_class g_dev_class = {
"DEV-class",
g_dev_taste,
NULL,
G_CLASS_INITSTUFF
};
static void
g_dev_clone(void *arg, char *name, int namelen, dev_t *dev)
{
struct g_geom *gp;
if (*dev != NODEV)
return;
g_trace(G_T_TOPOLOGY, "g_dev_clone(%s)", name);
g_rattle();
/* XXX: can I drop Giant here ??? */
/* g_topology_lock(); */
LIST_FOREACH(gp, &g_dev_class.geom, geom) {
if (strcmp(gp->name, name))
continue;
*dev = gp->softc;
g_trace(G_T_TOPOLOGY, "g_dev_clone(%s) = %p", name, *dev);
return;
}
/* g_topology_unlock(); */
return;
}
static void
g_dev_register_cloner(void *foo __unused)
{
static int once;
if (!once) {
if (!once)
EVENTHANDLER_REGISTER(dev_clone, g_dev_clone, 0, 1000);
once++;
}
}
SYSINIT(geomdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE,g_dev_register_cloner,NULL);
static struct g_geom *
g_dev_taste(struct g_class *mp, struct g_provider *pp, int insist __unused)
{
struct g_geom *gp;
struct g_consumer *cp;
static int unit;
u_int secsize;
off_t mediasize;
int error, j;
dev_t dev;
g_trace(G_T_TOPOLOGY, "dev_taste(%s,%s)", mp->name, pp->name);
g_topology_assert();
LIST_FOREACH(cp, &pp->consumers, consumers)
if (cp->geom->class == mp)
return (NULL);
gp = g_new_geomf(mp, pp->name);
gp->orphan = g_dev_orphan;
cp = g_new_consumer(gp);
g_attach(cp, pp);
error = g_access_rel(cp, 1, 0, 0);
g_topology_unlock();
if (!error) {
j = sizeof secsize;
error = g_io_getattr("GEOM::sectorsize", cp, &j, &secsize);
if (error) {
secsize = 512;
printf("g_dev_taste: error %d Sectors are %d bytes\n",
error, secsize);
}
j = sizeof mediasize;
error = g_io_getattr("GEOM::mediasize", cp, &j, &mediasize);
if (error) {
mediasize = 0;
printf("g_dev_taste: error %d Mediasize is %lld bytes\n",
error, (long long)mediasize);
}
g_topology_lock();
g_access_rel(cp, -1, 0, 0);
g_topology_unlock();
} else {
secsize = 512;
mediasize = 0;
}
mtx_lock(&Giant);
if (mediasize != 0)
printf("GEOM: \"%s\" %lld bytes in %lld sectors of %u bytes\n",
pp->name, (long long)mediasize,
(long long)mediasize / secsize, secsize);
else
printf("GEOM: \"%s\" (size unavailable)\n", pp->name);
dev = make_dev(&g_dev_cdevsw, unit++,
UID_ROOT, GID_WHEEL, 0600, gp->name);
gp->softc = dev;
dev->si_drv1 = gp;
dev->si_drv2 = cp;
mtx_unlock(&Giant);
g_topology_lock();
return (gp);
}
static int
g_dev_open(dev_t dev, int flags, int fmt, struct thread *td)
{
struct g_geom *gp;
struct g_consumer *cp;
int error, r, w, e;
gp = dev->si_drv1;
cp = dev->si_drv2;
if (gp == NULL || cp == NULL)
return(ENXIO);
g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)",
gp->name, flags, fmt, td);
DROP_GIANT();
g_topology_lock();
g_silence();
r = flags & FREAD ? 1 : 0;
w = flags & FWRITE ? 1 : 0;
e = flags & O_EXCL ? 1 : 0;
error = g_access_rel(cp, r, w, e);
g_topology_unlock();
PICKUP_GIANT();
g_rattle();
return(error);
}
static int
g_dev_close(dev_t dev, int flags, int fmt, struct thread *td)
{
struct g_geom *gp;
struct g_consumer *cp;
int error, r, w, e;
gp = dev->si_drv1;
cp = dev->si_drv2;
if (gp == NULL || cp == NULL)
return(ENXIO);
g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)",
gp->name, flags, fmt, td);
DROP_GIANT();
g_topology_lock();
g_silence();
r = flags & FREAD ? -1 : 0;
w = flags & FWRITE ? -1 : 0;
e = flags & O_EXCL ? -1 : 0;
error = g_access_rel(cp, r, w, e);
g_topology_unlock();
PICKUP_GIANT();
g_rattle();
return (error);
}
static int
g_dev_ioctl(dev_t dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
{
struct g_geom *gp;
struct g_consumer *cp;
struct g_kerneldump kd;
int i, error;
u_int u;
struct g_ioctl *gio;
gp = dev->si_drv1;
cp = dev->si_drv2;
error = 0;
DROP_GIANT();
i = IOCPARM_LEN(cmd);
switch (cmd) {
case DIOCGSECTORSIZE:
error = g_io_getattr("GEOM::sectorsize", cp, &i, data);
break;
case DIOCGMEDIASIZE:
error = g_io_getattr("GEOM::mediasize", cp, &i, data);
break;
case DIOCGFWSECTORS:
error = g_io_getattr("GEOM::fwsectors", cp, &i, data);
break;
case DIOCGFWHEADS:
error = g_io_getattr("GEOM::fwheads", cp, &i, data);
break;
case DIOCGFRONTSTUFF:
error = g_io_getattr("GEOM::frontstuff", cp, &i, data);
break;
case DIOCSKERNELDUMP:
u = *((u_int *)data);
if (!u) {
set_dumper(NULL);
error = 0;
break;
}
kd.offset = 0;
kd.length = OFF_MAX;
i = sizeof kd;
error = g_io_getattr("GEOM::kerneldump", cp, &i, &kd);
if (!error)
dev->si_flags |= SI_DUMPDEV;
break;
default:
gio = g_malloc(sizeof *gio, M_WAITOK);
gio->cmd = cmd;
gio->data = data;
gio->fflag = fflag;
gio->td = td;
i = sizeof *gio;
if (cmd & IOC_IN)
error = g_io_setattr("GEOM::ioctl", cp, i, gio);
else
error = g_io_getattr("GEOM::ioctl", cp, &i, gio);
g_free(gio);
break;
}
if (error != 0 && cmd == DIOCGDVIRGIN) {
g_topology_lock();
gp = g_create_geomf("BSD-class", cp->provider, NULL);
g_topology_unlock();
}
PICKUP_GIANT();
g_rattle();
if (error == ENOIOCTL) {
i = IOCGROUP(cmd);
printf("IOCTL(0x%lx) \"%s\"", cmd, gp->name);
if (i > ' ' && i <= '~')
printf(" '%c'", (int)IOCGROUP(cmd));
else
printf(" 0x%lx", IOCGROUP(cmd));
printf("/%ld ", cmd & 0xff);
if (cmd & IOC_IN)
printf("I");
if (cmd & IOC_OUT)
printf("O");
printf("(%ld) = ENOIOCTL\n", IOCPARM_LEN(cmd));
error = ENOTTY;
}
return (error);
}
static int
g_dev_psize(dev_t dev)
{
struct g_consumer *cp;
int i, error;
off_t mediasize;
cp = dev->si_drv2;
i = sizeof mediasize;
error = g_io_getattr("GEOM::mediasize", cp, &i, &mediasize);
if (error)
return (-1);
return (mediasize >> DEV_BSHIFT);
}
static void
g_dev_done(struct bio *bp2)
{
struct bio *bp;
bp = bp2->bio_linkage;
bp->bio_error = bp2->bio_error;
if (bp->bio_error != 0) {
g_trace(G_T_BIO, "g_dev_done(%p) had error %d",
bp2, bp->bio_error);
bp->bio_flags |= BIO_ERROR;
} else {
g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %lld",
bp2, bp, bp->bio_resid, bp2->bio_completed);
}
bp->bio_resid = bp->bio_bcount - bp2->bio_completed;
g_destroy_bio(bp2);
mtx_lock(&Giant);
biodone(bp);
mtx_unlock(&Giant);
}
static void
g_dev_strategy(struct bio *bp)
{
struct g_geom *gp;
struct g_consumer *cp;
struct bio *bp2;
dev_t dev;
dev = bp->bio_dev;
gp = dev->si_drv1;
cp = dev->si_drv2;
bp2 = g_clone_bio(bp);
bp2->bio_offset = (off_t)bp->bio_blkno << DEV_BSHIFT;
bp2->bio_length = (off_t)bp->bio_bcount;
bp2->bio_done = g_dev_done;
g_trace(G_T_BIO,
"g_dev_strategy(%p/%p) offset %lld length %lld data %p cmd %d",
bp, bp2, bp->bio_offset, bp2->bio_length, bp2->bio_data,
bp2->bio_cmd);
g_io_request(bp2, cp);
}
static void
g_dev_orphan(struct g_consumer *cp)
{
struct g_geom *gp;
dev_t dev;
gp = cp->geom;
g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, gp->name);
g_topology_assert();
if (cp->biocount > 0)
return;
dev = gp->softc;
if (dev->si_flags & SI_DUMPDEV)
set_dumper(NULL);
destroy_dev(dev);
if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0)
g_access_rel(cp, -cp->acr, -cp->acw, -cp->ace);
g_dettach(cp);
g_destroy_consumer(cp);
g_destroy_geom(gp);
}
DECLARE_GEOM_CLASS(g_dev_class, g_dev)
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