freebsd-dev/sys/geom/geom_bsd.c

270 lines
7.2 KiB
C

/*-
* 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>
#ifndef _KERNEL
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <signal.h>
#include <err.h>
#else
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/conf.h>
#include <sys/bio.h>
#include <sys/malloc.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#endif
#include <sys/errno.h>
#include <sys/disklabel.h>
#include <geom/geom.h>
#include <geom/geom_slice.h>
#define BSD_METHOD_NAME "BSD-method"
struct g_bsd_softc {
struct disklabel ondisk;
struct disklabel inram;
};
static void
ondisk2inram(struct g_bsd_softc *sc)
{
struct partition *ppp;
unsigned offset;
int i;
sc->inram = sc->ondisk;
offset = sc->inram.d_partitions[RAW_PART].p_offset;
for (i = 0; i < 8; i++) {
ppp = &sc->inram.d_partitions[i];
if (ppp->p_offset >= offset)
ppp->p_offset -= offset;
}
sc->inram.d_checksum = 0;
sc->inram.d_checksum = dkcksum(&sc->inram);
}
static int
g_bsd_start(struct bio *bp)
{
struct g_geom *gp;
struct g_bsd_softc *ms;
struct g_slicer *gsp;
struct g_ioctl *gio;
gp = bp->bio_to->geom;
gsp = gp->softc;
ms = gsp->softc;
if (strcmp(bp->bio_attribute, "GEOM::ioctl"))
return(0);
else if (bp->bio_length != sizeof *gio)
return(0);
gio = (struct g_ioctl *)bp->bio_data;
if (gio->cmd == DIOCGDINFO) {
bcopy(&ms->inram, gio->data, sizeof ms->inram);
bp->bio_error = 0;
g_io_deliver(bp);
return (1);
}
#ifdef _KERNEL
if (gio->cmd == DIOCGPART) {
struct partinfo pi;
pi.disklab = &ms->inram;
pi.part = &ms->inram.d_partitions[bp->bio_to->index];
bcopy(&pi, gio->data, sizeof pi);
bp->bio_error = 0;
g_io_deliver(bp);
return (1);
}
#endif
return (0);
}
static void
g_bsd_dumpconf(struct sbuf *sb, char *indent, struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp)
{
#if 0
struct g_mbr_softc *ms;
struct g_slicer *gsp;
gsp = gp->softc;
ms = gsp->softc;
if (pp != NULL) {
sbuf_printf(sb, "%s<type>%d</type>\n",
indent, ms->type[pp->index]);
}
#endif
g_slice_dumpconf(sb, indent, gp, cp, pp);
}
static struct g_geom *
g_bsd_taste(struct g_method *mp, struct g_provider *pp, struct thread *tp, int flags)
{
struct g_geom *gp;
struct g_consumer *cp;
struct g_provider *pp2;
int error, i, j, npart;
u_char *buf;
struct g_bsd_softc *ms;
struct disklabel *dl;
u_int secsize;
u_int fwsectors, fwheads;
off_t mediasize;
struct partition *ppp, *ppr;
g_trace(G_T_TOPOLOGY, "bsd_taste(%s,%s)", mp->name, pp->name);
g_topology_assert();
if (flags == G_TF_NORMAL &&
!strcmp(pp->geom->method->name, BSD_METHOD_NAME))
return (NULL);
gp = g_slice_new(mp, 8, pp, &cp, &ms, sizeof *ms, g_bsd_start);
if (gp == NULL)
return (NULL);
g_topology_unlock();
gp->dumpconf = g_bsd_dumpconf;
npart = 0;
while (1) { /* a trick to allow us to use break */
j = sizeof i;
error = g_io_getattr("MBR::type", cp, &j, &i, tp);
if (!error && i != 165 && flags == G_TF_NORMAL)
break;
j = sizeof secsize;
error = g_io_getattr("GEOM::sectorsize", cp, &j, &secsize, tp);
if (error) {
secsize = 512;
printf("g_bsd_taste: error %d Sectors are %d bytes\n",
error, secsize);
}
j = sizeof mediasize;
error = g_io_getattr("GEOM::mediasize", cp, &j, &mediasize, tp);
if (error) {
mediasize = 0;
printf("g_error %d Mediasize is %lld bytes\n",
error, mediasize);
}
buf = g_read_data(cp, secsize * LABELSECTOR, secsize, &error);
if (buf == NULL || error != 0)
break;
bcopy(buf, &ms->ondisk, sizeof(ms->ondisk));
dl = &ms->ondisk;
g_free(buf);
if (dl->d_magic != DISKMAGIC)
break;
if (dl->d_magic2 != DISKMAGIC)
break;
if (dkcksum(dl) != 0)
break;
if (bootverbose)
g_hexdump(dl, sizeof(*dl));
if (dl->d_secsize < secsize)
break;
if (dl->d_secsize > secsize)
secsize = dl->d_secsize;
ppr = &dl->d_partitions[2];
for (i = 0; i < 8; i++) {
ppp = &dl->d_partitions[i];
if (ppp->p_size == 0)
continue;
npart++;
pp2 = g_slice_addslice(gp, i,
((off_t)(ppp->p_offset - ppr->p_offset)) << 9ULL,
((off_t)ppp->p_size) << 9ULL,
"%s%c", pp->name, 'a' + i);
g_error_provider(pp2, 0);
}
ondisk2inram(ms);
break;
}
if (npart == 0 && (
(flags == G_TF_INSIST && mediasize != 0) ||
(flags == G_TF_TRANSPARENT))) {
dl = &ms->ondisk;
bzero(dl, sizeof *dl);
dl->d_magic = DISKMAGIC;
dl->d_magic2 = DISKMAGIC;
ppp = &dl->d_partitions[RAW_PART];
ppp->p_offset = 0;
ppp->p_size = mediasize / secsize;
dl->d_npartitions = MAXPARTITIONS;
dl->d_interleave = 1;
dl->d_secsize = secsize;
dl->d_rpm = 3600;
j = sizeof fwsectors;
error = g_io_getattr("GEOM::fwsectors", cp, &j, &fwsectors, tp);
if (error)
dl->d_nsectors = 32;
else
dl->d_nsectors = fwsectors;
error = g_io_getattr("GEOM::fwheads", cp, &j, &fwheads, tp);
if (error)
dl->d_ntracks = 64;
else
dl->d_ntracks = fwheads;
dl->d_secpercyl = dl->d_nsectors * dl->d_ntracks;
dl->d_ncylinders = ppp->p_size / dl->d_secpercyl;
dl->d_secperunit = ppp->p_size;
dl->d_checksum = 0;
dl->d_checksum = dkcksum(dl);
ms->inram = ms->ondisk;
pp2 = g_slice_addslice(gp, RAW_PART,
0, mediasize, "%s%c", pp->name, 'a' + RAW_PART);
g_error_provider(pp2, 0);
npart = 1;
}
g_topology_lock();
error = g_access_rel(cp, -1, 0, 0);
if (npart > 0)
return (gp);
g_std_spoiled(cp);
return (NULL);
}
static struct g_method g_bsd_method = {
BSD_METHOD_NAME,
g_bsd_taste,
g_slice_access,
g_slice_orphan,
NULL,
G_METHOD_INITSTUFF
};
DECLARE_GEOM_METHOD(g_bsd_method, g_bsd);