253 lines
6.9 KiB
C
253 lines
6.9 KiB
C
/*-
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* Copyright (c) 2002 Marcel Moolenaar
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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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* 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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#ifndef _KERNEL
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#include <stdio.h>
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#include <string.h>
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#include <signal.h>
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#include <sys/param.h>
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#include <stdlib.h>
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#include <err.h>
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#else
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.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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#endif
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#include <sys/endian.h>
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#include <sys/errno.h>
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#include <sys/disklabel.h>
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#include <sys/sbuf.h>
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#include <sys/uuid.h>
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#include <sys/gpt.h>
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#include <geom/geom.h>
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#include <geom/geom_slice.h>
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CTASSERT(offsetof(struct gpt_hdr, padding) == 92);
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CTASSERT(sizeof(struct gpt_ent) == 128);
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/*
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* XXX: GEOM is not dynamic enough. We are forced to use a compile-time
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* limit. The minimum number of partitions (128) as required by EFI is
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* most of the time just a waste of space.
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*/
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#define GPT_MAX_SLICES 128
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struct g_gpt_softc {
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struct gpt_ent *part[GPT_MAX_SLICES];
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};
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static int
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is_gpt_hdr(struct gpt_hdr *hdr)
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{
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uint32_t crc;
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if (memcmp(hdr->hdr_sig, GPT_HDR_SIG, sizeof(hdr->hdr_sig)))
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return (0);
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crc = hdr->hdr_crc_self;
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hdr->hdr_crc_self = 0;
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if (crc32(hdr, hdr->hdr_size) != crc)
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return (0);
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hdr->hdr_crc_self = crc;
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/* We're happy... */
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return (1);
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}
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static int
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g_gpt_start(struct bio *bp)
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{
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struct uuid freebsd = GPT_ENT_TYPE_FREEBSD;
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struct g_provider *pp = bp->bio_to;
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struct g_geom *gp = pp->geom;
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struct g_slicer *gsp = gp->softc;
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struct g_gpt_softc *gs = gsp->softc;
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u_int type;
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if (bp->bio_cmd != BIO_GETATTR)
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return (0);
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/*
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* XXX: this is bogus. The BSD class has a strong dependency on
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* the MBR/MBREXT class, because it asks for an attribute that's
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* specific to the MBR/MBREXT class and the value of the attribute
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* is just as specific to the MBR class. In an extensible scheme
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* a geom would ask another geom if it could possible accomodate a
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* class and the answer should be yes or no. Now we're forced to
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* emulate a MBR class :-/
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*/
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type = (memcmp(&gs->part[pp->index]->ent_type, &freebsd,
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sizeof(freebsd))) ? 0 : 165;
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return ((g_handleattr_int(bp, "MBR::type", type)) ? 1 : 0);
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}
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static void
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g_gpt_dumpconf(struct sbuf *sb, char *indent, struct g_geom *gp,
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struct g_consumer *cp, struct g_provider *pp)
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{
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struct g_slicer *gsp = gp->softc;
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struct g_gpt_softc *gs = gsp->softc;
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struct uuid *uuid;
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g_slice_dumpconf(sb, indent, gp, cp, pp);
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if (pp != NULL) {
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uuid = &gs->part[pp->index]->ent_type;
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sbuf_printf(sb, "%s<type>", indent);
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sbuf_printf_uuid(sb, uuid);
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sbuf_printf(sb, "</type>\n");
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}
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}
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static struct g_geom *
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g_gpt_taste(struct g_class *mp, struct g_provider *pp, int insist)
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{
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struct g_consumer *cp;
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struct g_geom *gp;
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struct g_gpt_softc *gs;
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struct g_slicer *gsp;
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u_char *buf, *mbr;
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struct gpt_ent *ent;
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struct gpt_hdr *hdr;
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u_int i, npart, secsz, tblsz;
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int error;
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g_trace(G_T_TOPOLOGY, "g_gpt_taste(%s,%s)", mp->name, pp->name);
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g_topology_assert();
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/*
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* XXX: I don't like to hardcode a maximum number of slices, since
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* it's wasting space most of the time and insufficient any time.
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* It's easier for now...
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*/
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gp = g_slice_new(mp, GPT_MAX_SLICES, pp, &cp, &gs, sizeof(*gs),
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g_gpt_start);
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if (gp == NULL)
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return (NULL);
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gsp = gp->softc;
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g_topology_unlock();
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gp->dumpconf = g_gpt_dumpconf;
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npart = 0;
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mbr = NULL;
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if (gp->rank != 2 && insist == 0)
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goto out;
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error = g_getattr("GEOM::sectorsize", cp, &secsz);
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if (error)
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goto out;
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/* XXX: we need to get the media size as well. */
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/* Read both the MBR sector and the GPT sector. */
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mbr = g_read_data(cp, 0, 2 * secsz, &error);
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if (mbr == NULL || error != 0)
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goto out;
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#if 0
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/*
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* XXX: we should ignore the GPT if there's a MBR and the MBR is
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* not a PMBR (Protective MBR). I believe this is what the EFI
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* spec is going to say eventually (this is hearsay :-)
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* Currently EFI (version 1.02) accepts and uses the GPT even
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* though there's a valid MBR. We do this too, because it allows
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* us to test this code without first nuking the only partitioning
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* scheme we grok until this is working.
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*/
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if (!is_pmbr((void*)mbr))
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goto out;
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#endif
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hdr = (void*)(mbr + secsz);
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/*
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* XXX: if we don't have a GPT header at LBA 1, we should check if
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* there's a backup GPT at the end of the medium. If we have a valid
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* backup GPT, we should restore the primary GPT and claim this lunch.
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*/
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if (!is_gpt_hdr(hdr))
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goto out;
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tblsz = (hdr->hdr_entries * hdr->hdr_entsz + secsz - 1) & ~(secsz - 1);
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buf = g_read_data(cp, hdr->hdr_lba_table * secsz, tblsz, &error);
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gsp->frontstuff = hdr->hdr_lba_start * secsz;
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for (i = 0; i < hdr->hdr_entries; i++) {
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struct uuid unused = GPT_ENT_TYPE_UNUSED;
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if (i >= GPT_MAX_SLICES)
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break;
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ent = (void*)(buf + i * hdr->hdr_entsz);
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if (!memcmp(&ent->ent_type, &unused, sizeof(unused)))
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continue;
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gs->part[i] = g_malloc(hdr->hdr_entsz, M_WAITOK);
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if (gs->part[i] == NULL)
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break;
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bcopy(ent, gs->part[i], hdr->hdr_entsz);
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(void)g_slice_addslice(gp, i, ent->ent_lba_start * secsz,
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(ent->ent_lba_end - ent->ent_lba_start + 1ULL) * secsz,
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"%ss%d", gp->name, i + 1);
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npart++;
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}
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g_free(buf);
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out:
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if (mbr != NULL)
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g_free(mbr);
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g_topology_lock();
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error = g_access_rel(cp, -1, 0, 0);
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if (npart > 0) {
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LIST_FOREACH(pp, &gp->provider, provider)
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g_error_provider(pp, 0);
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return (gp);
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}
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g_std_spoiled(cp);
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return (NULL);
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}
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static struct g_class g_gpt_class = {
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"GPT",
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g_gpt_taste,
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NULL,
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G_CLASS_INITIALIZER
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};
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DECLARE_GEOM_CLASS(g_gpt_class, g_gpt);
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