Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/geom/geom_gpt.c
Version:
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1 /*- 2 * Copyright (c) 2002 Marcel Moolenaar 3 * Copyright (c) 2002 Poul-Henning Kamp 4 * Copyright (c) 2002 Networks Associates Technology, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The names of the authors may not be used to endorse or promote 16 * products derived from this software without specific prior written 17 * permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD: releng/5.2/sys/geom/geom_gpt.c 116196 2003-06-11 06:49:16Z obrien $"); 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/kernel.h> 38 #include <sys/malloc.h> 39 #include <sys/bio.h> 40 #include <sys/lock.h> 41 #include <sys/mutex.h> 42 43 #include <sys/endian.h> 44 #include <sys/sbuf.h> 45 #include <sys/uuid.h> 46 #include <sys/gpt.h> 47 #include <geom/geom.h> 48 #include <geom/geom_slice.h> 49 50 CTASSERT(offsetof(struct gpt_hdr, padding) == 92); 51 CTASSERT(sizeof(struct gpt_ent) == 128); 52 53 /* 54 * XXX: GEOM is not dynamic enough. We are forced to use a compile-time 55 * limit. The minimum number of partitions (128) as required by EFI is 56 * most of the time just a waste of space. 57 */ 58 #define GPT_MAX_SLICES 128 59 60 struct g_gpt_softc { 61 struct gpt_ent *part[GPT_MAX_SLICES]; 62 }; 63 64 static int 65 is_gpt_hdr(struct gpt_hdr *hdr) 66 { 67 uint32_t crc; 68 69 if (memcmp(hdr->hdr_sig, GPT_HDR_SIG, sizeof(hdr->hdr_sig))) 70 return (0); 71 crc = hdr->hdr_crc_self; 72 hdr->hdr_crc_self = 0; 73 if (crc32(hdr, hdr->hdr_size) != crc) 74 return (0); 75 hdr->hdr_crc_self = crc; 76 /* We're happy... */ 77 return (1); 78 } 79 80 static int 81 g_gpt_start(struct bio *bp) 82 { 83 84 return (0); 85 } 86 87 static void 88 g_gpt_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 89 struct g_consumer *cp, struct g_provider *pp) 90 { 91 struct g_slicer *gsp = gp->softc; 92 struct g_gpt_softc *gs = gsp->softc; 93 struct uuid *uuid; 94 95 g_slice_dumpconf(sb, indent, gp, cp, pp); 96 97 if (pp != NULL) { 98 uuid = &gs->part[pp->index]->ent_type; 99 if (indent != NULL) 100 sbuf_printf(sb, "%s<type>", indent); 101 else 102 sbuf_printf(sb, " ty "); 103 sbuf_printf_uuid(sb, uuid); 104 if (indent != NULL) 105 sbuf_printf(sb, "</type>\n"); 106 } 107 } 108 109 static struct g_geom * 110 g_gpt_taste(struct g_class *mp, struct g_provider *pp, int insist) 111 { 112 struct g_consumer *cp; 113 struct g_geom *gp; 114 struct g_gpt_softc *gs; 115 u_char *buf, *mbr; 116 struct gpt_ent *ent; 117 struct gpt_hdr *hdr; 118 u_int i, secsz, tblsz; 119 int error, ps; 120 121 g_trace(G_T_TOPOLOGY, "g_gpt_taste(%s,%s)", mp->name, pp->name); 122 g_topology_assert(); 123 124 /* 125 * XXX: I don't like to hardcode a maximum number of slices, since 126 * it's wasting space most of the time and insufficient any time. 127 * It's easier for now... 128 */ 129 gp = g_slice_new(mp, GPT_MAX_SLICES, pp, &cp, &gs, sizeof(*gs), 130 g_gpt_start); 131 if (gp == NULL) 132 return (NULL); 133 134 g_topology_unlock(); 135 gp->dumpconf = g_gpt_dumpconf; 136 137 do { 138 139 mbr = NULL; 140 141 if (gp->rank != 2 && insist == 0) 142 break; 143 144 secsz = cp->provider->sectorsize; 145 if (secsz < 512) 146 break; 147 148 /* XXX: we need to get the media size as well. */ 149 150 /* Read both the MBR sector and the GPT sector. */ 151 mbr = g_read_data(cp, 0, 2 * secsz, &error); 152 if (mbr == NULL || error != 0) 153 break; 154 #if 0 155 /* 156 * XXX: we should ignore the GPT if there's a MBR and the MBR is 157 * not a PMBR (Protective MBR). I believe this is what the EFI 158 * spec is going to say eventually (this is hearsay :-) 159 * Currently EFI (version 1.02) accepts and uses the GPT even 160 * though there's a valid MBR. We do this too, because it allows 161 * us to test this code without first nuking the only partitioning 162 * scheme we grok until this is working. 163 */ 164 if (!is_pmbr((void*)mbr)) 165 goto out; 166 #endif 167 168 hdr = (void*)(mbr + secsz); 169 170 /* 171 * XXX: if we don't have a GPT header at LBA 1, we should check if 172 * there's a backup GPT at the end of the medium. If we have a valid 173 * backup GPT, we should restore the primary GPT and claim this lunch. 174 */ 175 if (!is_gpt_hdr(hdr)) 176 break; 177 178 tblsz = (hdr->hdr_entries * hdr->hdr_entsz + secsz - 1) & 179 ~(secsz - 1); 180 buf = g_read_data(cp, hdr->hdr_lba_table * secsz, tblsz, &error); 181 for (i = 0; i < hdr->hdr_entries; i++) { 182 struct uuid unused = GPT_ENT_TYPE_UNUSED; 183 struct uuid freebsd = GPT_ENT_TYPE_FREEBSD; 184 struct uuid tmp; 185 if (i >= GPT_MAX_SLICES) 186 break; 187 ent = (void*)(buf + i * hdr->hdr_entsz); 188 le_uuid_dec(&ent->ent_type, &tmp); 189 if (!memcmp(&tmp, &unused, sizeof(unused))) 190 continue; 191 /* XXX: This memory leaks */ 192 gs->part[i] = g_malloc(hdr->hdr_entsz, M_WAITOK); 193 if (gs->part[i] == NULL) 194 break; 195 bcopy(ent, gs->part[i], hdr->hdr_entsz); 196 ps = (!memcmp(&tmp, &freebsd, sizeof(freebsd))) 197 ? 's' : 'p'; 198 g_topology_lock(); 199 (void)g_slice_config(gp, i, G_SLICE_CONFIG_SET, 200 ent->ent_lba_start * secsz, 201 (1 + ent->ent_lba_end - ent->ent_lba_start) * secsz, 202 secsz, 203 "%s%c%d", gp->name, ps, i + 1); 204 g_topology_unlock(); 205 } 206 g_free(buf); 207 208 } while (0); 209 210 if (mbr != NULL) 211 g_free(mbr); 212 213 g_topology_lock(); 214 g_access_rel(cp, -1, 0, 0); 215 if (LIST_EMPTY(&gp->provider)) { 216 g_slice_spoiled(cp); 217 return (NULL); 218 } 219 return (gp); 220 } 221 222 static struct g_class g_gpt_class = { 223 .name = "GPT", 224 .taste = g_gpt_taste, 225 }; 226 227 DECLARE_GEOM_CLASS(g_gpt_class, g_gpt);
Cache object: c9268145eb4ade621e6e327fc5a2b690
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