diff options
Diffstat (limited to 'sys/geom/geom_gpt.c')
| -rw-r--r-- | sys/geom/geom_gpt.c | 314 |
1 files changed, 314 insertions, 0 deletions
diff --git a/sys/geom/geom_gpt.c b/sys/geom/geom_gpt.c new file mode 100644 index 0000000..3f446e3 --- /dev/null +++ b/sys/geom/geom_gpt.c @@ -0,0 +1,314 @@ +/*- + * 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. + * + * $FreeBSD$ + */ + +/* + * CRC32 code derived from work by Gary S. Brown. + */ + +#include <sys/param.h> +#ifndef _KERNEL +#include <stdio.h> +#include <string.h> +#include <signal.h> +#include <sys/param.h> +#include <stdlib.h> +#include <err.h> +#else +#include <sys/systm.h> +#include <sys/kernel.h> +#include <sys/malloc.h> +#include <sys/bio.h> +#include <sys/lock.h> +#include <sys/mutex.h> +#endif + +#include <sys/endian.h> +#include <sys/errno.h> +#include <sys/disklabel.h> +#include <sys/sbuf.h> +#include <sys/uuid.h> +#include <sys/gpt.h> +#include <geom/geom.h> +#include <geom/geom_slice.h> + +/* + * 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 uint32_t crc32_tab[] = { + 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, + 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, + 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2, + 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, + 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, + 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, + 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c, + 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, + 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, + 0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, + 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106, + 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, + 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, + 0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, + 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, + 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, + 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, + 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, + 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, + 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, + 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, + 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, + 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84, + 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, + 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, + 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, + 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e, + 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, + 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, + 0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, + 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28, + 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, + 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, + 0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, + 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, + 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, + 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, + 0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, + 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, + 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, + 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, + 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, + 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d +}; + +static uint32_t +crc32(const void *buf, size_t size) +{ + const uint8_t *p; + uint32_t crc; + + p = buf; + crc = ~0U; + + while (size--) + crc = crc32_tab[(crc ^ *p++) & 0xFF] ^ (crc >> 8); + + return crc ^ ~0U; +} + +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) +{ + struct uuid freebsd = GPT_ENT_TYPE_FREEBSD; + struct g_provider *pp = bp->bio_to; + struct g_geom *gp = pp->geom; + struct g_slicer *gsp = gp->softc; + struct g_gpt_softc *gs = gsp->softc; + u_int type; + + if (bp->bio_cmd != BIO_GETATTR) + return (0); + + /* + * XXX: this is bogus. The BSD class has a strong dependency on + * the MBR/MBREXT class, because it asks for an attribute that's + * specific to the MBR/MBREXT class and the value of the attribute + * is just as specific to the MBR class. In an extensible scheme + * a geom would ask another geom if it could possible accomodate a + * class and the answer should be yes or no. Now we're forced to + * emulate a MBR class :-/ + */ + type = (memcmp(&gs->part[pp->index]->ent_type, &freebsd, + sizeof(freebsd))) ? 0 : 165; + return ((g_haveattr_int(bp, "MBR::type", type)) ? 1 : 0); +} + +static void +g_gpt_dumpconf(struct sbuf *sb, 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; + sbuf_printf(sb, "%s<type>", indent); + sbuf_printf_uuid(sb, uuid); + 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; + struct g_slicer *gsp; + u_char *buf, *mbr; + struct gpt_ent *ent; + struct gpt_hdr *hdr; + u_int i, npart, secsz, tblsz; + int error; + + 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); + + gsp = gp->softc; + g_topology_unlock(); + gp->dumpconf = g_gpt_dumpconf; + + npart = 0; + mbr = NULL; + + if (gp->rank != 2 && insist == 0) + goto out; + + error = g_getattr("GEOM::sectorsize", cp, &secsz); + if (error) + goto out; + + /* 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) + goto out; +#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)) + goto out; + + tblsz = (hdr->hdr_entries * hdr->hdr_entsz + secsz - 1) & ~(secsz - 1); + buf = g_read_data(cp, hdr->hdr_lba_table * secsz, tblsz, &error); + + gsp->frontstuff = hdr->hdr_lba_start * secsz; + + for (i = 0; i < hdr->hdr_entries; i++) { + struct uuid unused = GPT_ENT_TYPE_UNUSED; + if (i >= GPT_MAX_SLICES) + break; + ent = (void*)(buf + i * hdr->hdr_entsz); + if (!memcmp(&ent->ent_type, &unused, sizeof(unused))) + continue; + gs->part[i] = g_malloc(hdr->hdr_entsz, M_WAITOK); + if (gs->part[i] == NULL) + break; + bcopy(ent, gs->part[i], hdr->hdr_entsz); + (void)g_slice_addslice(gp, i, ent->ent_lba_start * secsz, + (ent->ent_lba_end - ent->ent_lba_start + 1ULL) * secsz, + "%ss%d", gp->name, i + 1); + npart++; + } + + g_free(buf); + + out: + if (mbr != NULL) + g_free(mbr); + + g_topology_lock(); + error = g_access_rel(cp, -1, 0, 0); + + if (npart > 0) { + LIST_FOREACH(pp, &gp->provider, provider) + g_error_provider(pp, 0); + return (gp); + } + g_std_spoiled(cp); + return (NULL); +} + +static struct g_class g_gpt_class = { + "GPT", + g_gpt_taste, + NULL, + G_CLASS_INITSTUFF +}; + +DECLARE_GEOM_CLASS(g_gpt_class, g_gpt); |
