diff options
Diffstat (limited to 'sys/geom/geom_gpt.c')
| -rw-r--r-- | sys/geom/geom_gpt.c | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/sys/geom/geom_gpt.c b/sys/geom/geom_gpt.c new file mode 100644 index 0000000..52951c4 --- /dev/null +++ b/sys/geom/geom_gpt.c @@ -0,0 +1,227 @@ +/*- + * Copyright (c) 2002 Marcel Moolenaar + * Copyright (c) 2002 Poul-Henning Kamp + * Copyright (c) 2002 Networks Associates Technology, Inc. + * All rights reserved. + * + * 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. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/kernel.h> +#include <sys/malloc.h> +#include <sys/bio.h> +#include <sys/lock.h> +#include <sys/mutex.h> + +#include <sys/endian.h> +#include <sys/sbuf.h> +#include <sys/uuid.h> +#include <sys/gpt.h> +#include <geom/geom.h> +#include <geom/geom_slice.h> + +CTASSERT(offsetof(struct gpt_hdr, padding) == 92); +CTASSERT(sizeof(struct gpt_ent) == 128); + +/* + * XXX: GEOM is not dynamic enough. We are forced to use a compile-time + * limit. The minimum number of partitions (128) as required by EFI is + * most of the time just a waste of space. + */ +#define GPT_MAX_SLICES 128 + +struct g_gpt_softc { + struct gpt_ent *part[GPT_MAX_SLICES]; +}; + +static int +is_gpt_hdr(struct gpt_hdr *hdr) +{ + uint32_t crc; + + if (memcmp(hdr->hdr_sig, GPT_HDR_SIG, sizeof(hdr->hdr_sig))) + return (0); + crc = hdr->hdr_crc_self; + hdr->hdr_crc_self = 0; + if (crc32(hdr, hdr->hdr_size) != crc) + return (0); + hdr->hdr_crc_self = crc; + /* We're happy... */ + return (1); +} + +static int +g_gpt_start(struct bio *bp) +{ + + return (0); +} + +static void +g_gpt_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, + struct g_consumer *cp, struct g_provider *pp) +{ + struct g_slicer *gsp = gp->softc; + struct g_gpt_softc *gs = gsp->softc; + struct uuid *uuid; + + g_slice_dumpconf(sb, indent, gp, cp, pp); + + if (pp != NULL) { + uuid = &gs->part[pp->index]->ent_type; + if (indent != NULL) + sbuf_printf(sb, "%s<type>", indent); + else + sbuf_printf(sb, " ty "); + sbuf_printf_uuid(sb, uuid); + if (indent != NULL) + sbuf_printf(sb, "</type>\n"); + } +} + +static struct g_geom * +g_gpt_taste(struct g_class *mp, struct g_provider *pp, int insist) +{ + struct g_consumer *cp; + struct g_geom *gp; + struct g_gpt_softc *gs; + u_char *buf, *mbr; + struct gpt_ent *ent; + struct gpt_hdr *hdr; + u_int i, secsz, tblsz; + int error, ps; + + g_trace(G_T_TOPOLOGY, "g_gpt_taste(%s,%s)", mp->name, pp->name); + g_topology_assert(); + + /* + * XXX: I don't like to hardcode a maximum number of slices, since + * it's wasting space most of the time and insufficient any time. + * It's easier for now... + */ + gp = g_slice_new(mp, GPT_MAX_SLICES, pp, &cp, &gs, sizeof(*gs), + g_gpt_start); + if (gp == NULL) + return (NULL); + + g_topology_unlock(); + gp->dumpconf = g_gpt_dumpconf; + + do { + + mbr = NULL; + + if (gp->rank != 2 && insist == 0) + break; + + secsz = cp->provider->sectorsize; + if (secsz < 512) + break; + + /* XXX: we need to get the media size as well. */ + + /* Read both the MBR sector and the GPT sector. */ + mbr = g_read_data(cp, 0, 2 * secsz, &error); + if (mbr == NULL || error != 0) + break; +#if 0 + /* + * XXX: we should ignore the GPT if there's a MBR and the MBR is + * not a PMBR (Protective MBR). I believe this is what the EFI + * spec is going to say eventually (this is hearsay :-) + * Currently EFI (version 1.02) accepts and uses the GPT even + * though there's a valid MBR. We do this too, because it allows + * us to test this code without first nuking the only partitioning + * scheme we grok until this is working. + */ + if (!is_pmbr((void*)mbr)) + goto out; +#endif + + hdr = (void*)(mbr + secsz); + + /* + * XXX: if we don't have a GPT header at LBA 1, we should check if + * there's a backup GPT at the end of the medium. If we have a valid + * backup GPT, we should restore the primary GPT and claim this lunch. + */ + if (!is_gpt_hdr(hdr)) + break; + + tblsz = (hdr->hdr_entries * hdr->hdr_entsz + secsz - 1) & + ~(secsz - 1); + buf = g_read_data(cp, hdr->hdr_lba_table * secsz, tblsz, &error); + for (i = 0; i < hdr->hdr_entries; i++) { + struct uuid unused = GPT_ENT_TYPE_UNUSED; + struct uuid freebsd = GPT_ENT_TYPE_FREEBSD; + struct uuid tmp; + if (i >= GPT_MAX_SLICES) + break; + ent = (void*)(buf + i * hdr->hdr_entsz); + le_uuid_dec(&ent->ent_type, &tmp); + if (!memcmp(&tmp, &unused, sizeof(unused))) + continue; + /* XXX: This memory leaks */ + gs->part[i] = g_malloc(hdr->hdr_entsz, M_WAITOK); + if (gs->part[i] == NULL) + break; + bcopy(ent, gs->part[i], hdr->hdr_entsz); + ps = (!memcmp(&tmp, &freebsd, sizeof(freebsd))) + ? 's' : 'p'; + g_topology_lock(); + (void)g_slice_config(gp, i, G_SLICE_CONFIG_SET, + ent->ent_lba_start * secsz, + (1 + ent->ent_lba_end - ent->ent_lba_start) * secsz, + secsz, + "%s%c%d", gp->name, ps, i + 1); + g_topology_unlock(); + } + g_free(buf); + + } while (0); + + if (mbr != NULL) + g_free(mbr); + + g_topology_lock(); + g_access_rel(cp, -1, 0, 0); + if (LIST_EMPTY(&gp->provider)) { + g_slice_spoiled(cp); + return (NULL); + } + return (gp); +} + +static struct g_class g_gpt_class = { + .name = "GPT", + .taste = g_gpt_taste, +}; + +DECLARE_GEOM_CLASS(g_gpt_class, g_gpt); |
