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freebsd-skq/sys/geom/geom_bsd.c
phk c9901ea470 Generalize a bit: we don't need separate functions to find the i386 and 
alpha disklabels, just one function which is told where to look.

Sponsored by: DARPA & NAI Labs.
2002-05-19 19:00:25 +00:00

419 lines
12 KiB
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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>
#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_CLASS_NAME "BSD-class"
struct g_bsd_softc {
off_t labeloffset;
struct disklabel ondisk;
struct disklabel inram;
};
static void
g_bsd_ledec_partition(u_char *ptr, struct partition *d)
{
d->p_size = g_dec_le4(ptr + 0);
d->p_offset = g_dec_le4(ptr + 4);
d->p_fsize = g_dec_le4(ptr + 8);
d->p_fstype = ptr[12];
d->p_frag = ptr[13];
d->p_cpg = g_dec_le2(ptr + 14);
}
static void
g_bsd_ledec_disklabel(u_char *ptr, struct disklabel *d)
{
d->d_magic = g_dec_le4(ptr + 0);
d->d_type = g_dec_le2(ptr + 4);
d->d_subtype = g_dec_le2(ptr + 6);
bcopy(ptr + 8, d->d_typename, 16);
bcopy(d->d_packname, ptr + 24, 16);
d->d_secsize = g_dec_le4(ptr + 40);
d->d_nsectors = g_dec_le4(ptr + 44);
d->d_ntracks = g_dec_le4(ptr + 48);
d->d_ncylinders = g_dec_le4(ptr + 52);
d->d_secpercyl = g_dec_le4(ptr + 56);
d->d_secperunit = g_dec_le4(ptr + 60);
d->d_sparespertrack = g_dec_le2(ptr + 64);
d->d_sparespercyl = g_dec_le2(ptr + 66);
d->d_acylinders = g_dec_le4(ptr + 68);
d->d_rpm = g_dec_le2(ptr + 72);
d->d_interleave = g_dec_le2(ptr + 74);
d->d_trackskew = g_dec_le2(ptr + 76);
d->d_cylskew = g_dec_le2(ptr + 78);
d->d_headswitch = g_dec_le4(ptr + 80);
d->d_trkseek = g_dec_le4(ptr + 84);
d->d_flags = g_dec_le4(ptr + 88);
d->d_drivedata[0] = g_dec_le4(ptr + 92);
d->d_drivedata[1] = g_dec_le4(ptr + 96);
d->d_drivedata[2] = g_dec_le4(ptr + 100);
d->d_drivedata[3] = g_dec_le4(ptr + 104);
d->d_drivedata[4] = g_dec_le4(ptr + 108);
d->d_spare[0] = g_dec_le4(ptr + 112);
d->d_spare[1] = g_dec_le4(ptr + 116);
d->d_spare[2] = g_dec_le4(ptr + 120);
d->d_spare[3] = g_dec_le4(ptr + 124);
d->d_spare[4] = g_dec_le4(ptr + 128);
d->d_magic2 = g_dec_le4(ptr + 132);
d->d_checksum = g_dec_le2(ptr + 136);
d->d_npartitions = g_dec_le2(ptr + 138);
d->d_bbsize = g_dec_le4(ptr + 140);
d->d_sbsize = g_dec_le4(ptr + 144);
g_bsd_ledec_partition(ptr + 148, &d->d_partitions[0]);
g_bsd_ledec_partition(ptr + 164, &d->d_partitions[1]);
g_bsd_ledec_partition(ptr + 180, &d->d_partitions[2]);
g_bsd_ledec_partition(ptr + 196, &d->d_partitions[3]);
g_bsd_ledec_partition(ptr + 212, &d->d_partitions[4]);
g_bsd_ledec_partition(ptr + 228, &d->d_partitions[5]);
g_bsd_ledec_partition(ptr + 244, &d->d_partitions[6]);
g_bsd_ledec_partition(ptr + 260, &d->d_partitions[7]);
}
#if 0
static void
g_bsd_leenc_partition(u_char *ptr, struct partition *d)
{
g_enc_le4(ptr + 0, d->p_size);
g_enc_le4(ptr + 4, d->p_offset);
g_enc_le4(ptr + 8, d->p_fsize);
ptr[12] = d->p_fstype;
ptr[13] = d->p_frag;
g_enc_le2(ptr + 14, d->p_cpg);
}
static void
g_bsd_leenc_disklabel(u_char *ptr, struct disklabel *d)
{
g_enc_le4(ptr + 0, d->d_magic);
g_enc_le2(ptr + 4, d->d_type);
g_enc_le2(ptr + 6, d->d_subtype);
bcopy(d->d_typename, ptr + 8, 16);
bcopy(d->d_packname, ptr + 24, 16);
g_enc_le4(ptr + 40, d->d_secsize);
g_enc_le4(ptr + 44, d->d_nsectors);
g_enc_le4(ptr + 48, d->d_ntracks);
g_enc_le4(ptr + 52, d->d_ncylinders);
g_enc_le4(ptr + 56, d->d_secpercyl);
g_enc_le4(ptr + 60, d->d_secperunit);
g_enc_le2(ptr + 64, d->d_sparespertrack);
g_enc_le2(ptr + 66, d->d_sparespercyl);
g_enc_le4(ptr + 68, d->d_acylinders);
g_enc_le2(ptr + 72, d->d_rpm);
g_enc_le2(ptr + 74, d->d_interleave);
g_enc_le2(ptr + 76, d->d_trackskew);
g_enc_le2(ptr + 78, d->d_cylskew);
g_enc_le4(ptr + 80, d->d_headswitch);
g_enc_le4(ptr + 84, d->d_trkseek);
g_enc_le4(ptr + 88, d->d_flags);
g_enc_le4(ptr + 92, d->d_drivedata[0]);
g_enc_le4(ptr + 96, d->d_drivedata[1]);
g_enc_le4(ptr + 100, d->d_drivedata[2]);
g_enc_le4(ptr + 104, d->d_drivedata[3]);
g_enc_le4(ptr + 108, d->d_drivedata[4]);
g_enc_le4(ptr + 112, d->d_spare[0]);
g_enc_le4(ptr + 116, d->d_spare[1]);
g_enc_le4(ptr + 120, d->d_spare[2]);
g_enc_le4(ptr + 124, d->d_spare[3]);
g_enc_le4(ptr + 128, d->d_spare[4]);
g_enc_le4(ptr + 132, d->d_magic2);
g_enc_le2(ptr + 136, d->d_checksum);
g_enc_le2(ptr + 138, d->d_npartitions);
g_enc_le4(ptr + 140, d->d_bbsize);
g_enc_le4(ptr + 144, d->d_sbsize);
g_bsd_leenc_partition(ptr + 148, &d->d_partitions[0]);
g_bsd_leenc_partition(ptr + 164, &d->d_partitions[1]);
g_bsd_leenc_partition(ptr + 180, &d->d_partitions[2]);
g_bsd_leenc_partition(ptr + 196, &d->d_partitions[3]);
g_bsd_leenc_partition(ptr + 212, &d->d_partitions[4]);
g_bsd_leenc_partition(ptr + 228, &d->d_partitions[5]);
g_bsd_leenc_partition(ptr + 244, &d->d_partitions[6]);
g_bsd_leenc_partition(ptr + 260, &d->d_partitions[7]);
}
#endif
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);
}
/*
* It is rather fortunate that this checksum only covers up to the
* actual end of actual data, otherwise the pointer-screwup in
* alpha architectures would have been much harder to handle.
*/
static int
g_bsd_lesum(struct disklabel *dl, u_char *p)
{
u_char *pe;
uint16_t sum;
pe = p + 148 + 16 * dl->d_npartitions;
sum = 0;
while (p < pe) {
sum ^= g_dec_le2(p);
p += 2;
}
return (sum);
}
static int
g_bsd_try(struct g_slicer *gsp, struct g_consumer *cp, int secsize, struct g_bsd_softc *ms, off_t offset)
{
int error;
u_char *buf;
struct disklabel *dl;
off_t secoff;
dl = &ms->ondisk;
secoff = offset % secsize;
buf = g_read_data(cp, offset - secoff, secsize, &error);
if (buf == NULL || error != 0)
return(ENOENT);
g_bsd_ledec_disklabel(buf + secoff, dl);
if (dl->d_magic == DISKMAGIC &&
dl->d_magic2 == DISKMAGIC &&
g_bsd_lesum(dl, buf + secoff) == 0)
error = 0;
else
error = ENOENT;
g_free(buf);
if (error == 0) {
gsp->frontstuff = 16 * secsize;
ms->labeloffset = offset;
}
return(error);
}
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);
}
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)
{
struct g_bsd_softc *ms;
struct g_slicer *gsp;
gsp = gp->softc;
ms = gsp->softc;
if (pp == NULL && cp == NULL) {
sbuf_printf(sb, "%s<labeloffset>%lld</labeloffset>\n",
indent, ms->labeloffset);
}
g_slice_dumpconf(sb, indent, gp, cp, pp);
}
static struct g_geom *
g_bsd_taste(struct g_class *mp, struct g_provider *pp, int flags)
{
struct g_geom *gp;
struct g_consumer *cp;
struct g_provider *pp2;
int error, i, j, npart;
struct g_bsd_softc *ms;
struct disklabel *dl;
u_int secsize;
u_int fwsectors, fwheads;
off_t mediasize;
struct partition *ppp, *ppr;
struct g_slicer *gsp;
g_trace(G_T_TOPOLOGY, "bsd_taste(%s,%s)", mp->name, pp->name);
g_topology_assert();
if (flags == G_TF_NORMAL &&
!strcmp(pp->geom->class->name, BSD_CLASS_NAME))
return (NULL);
gp = g_slice_new(mp, 8, pp, &cp, &ms, sizeof *ms, g_bsd_start);
if (gp == NULL)
return (NULL);
gsp = gp->softc;
g_topology_unlock();
gp->dumpconf = g_bsd_dumpconf;
npart = 0;
while (1) { /* a trick to allow us to use break */
error = g_getattr("MBR::type", cp, &i);
if (!error && i != 165 && flags == G_TF_NORMAL)
break;
error = g_getattr("GEOM::sectorsize", cp, &secsize);
if (error) {
secsize = 512;
printf("g_bsd_taste: error %d Sectors are %d bytes\n",
error, secsize);
}
error = g_getattr("GEOM::mediasize", cp, &mediasize);
if (error) {
mediasize = 0;
printf("g_error %d Mediasize is %lld bytes\n",
error, (long long)mediasize);
}
error = g_bsd_try(gsp, cp, secsize, ms, secsize);
if (error)
error = g_bsd_try(gsp, cp, secsize, ms, 64);
if (error)
break;
dl = &ms->ondisk;
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);
if (error)
dl->d_nsectors = 32;
else
dl->d_nsectors = fwsectors;
error = g_io_getattr("GEOM::fwheads", cp, &j, &fwheads);
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_class g_bsd_class = {
BSD_CLASS_NAME,
g_bsd_taste,
NULL,
G_CLASS_INITSTUFF
};
DECLARE_GEOM_CLASS(g_bsd_class, g_bsd);
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