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_sunlabel.c
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1 /*- 2 * Copyright (c) 2002 Poul-Henning Kamp 3 * Copyright (c) 2002 Networks Associates Technology, Inc. 4 * All rights reserved. 5 * 6 * This software was developed for the FreeBSD Project by Poul-Henning Kamp 7 * and NAI Labs, the Security Research Division of Network Associates, Inc. 8 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 9 * DARPA CHATS research program. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. The names of the authors may not be used to endorse or promote 20 * products derived from this software without specific prior written 21 * permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD: releng/11.2/sys/geom/geom_sunlabel.c 332640 2018-04-17 02:18:04Z kevans $"); 38 39 #include <sys/param.h> 40 #include <sys/endian.h> 41 #include <sys/systm.h> 42 #include <sys/sysctl.h> 43 #include <sys/kernel.h> 44 #include <sys/conf.h> 45 #include <sys/bio.h> 46 #include <sys/malloc.h> 47 #include <sys/lock.h> 48 #include <sys/mutex.h> 49 #include <sys/md5.h> 50 #include <sys/sbuf.h> 51 #include <sys/sun_disklabel.h> 52 #include <geom/geom.h> 53 #include <geom/geom_slice.h> 54 #include <machine/endian.h> 55 56 FEATURE(geom_sunlabel, "GEOM Sun/Solaris partitioning support"); 57 58 #define SUNLABEL_CLASS_NAME "SUN" 59 60 struct g_sunlabel_softc { 61 int sectorsize; 62 int nheads; 63 int nsects; 64 int nalt; 65 u_char labelsum[16]; 66 }; 67 68 static int g_sunlabel_once = 0; 69 70 static int 71 g_sunlabel_modify(struct g_geom *gp, struct g_sunlabel_softc *ms, u_char *sec0) 72 { 73 int i, error; 74 u_int u, v, csize; 75 struct sun_disklabel sl; 76 MD5_CTX md5sum; 77 78 error = sunlabel_dec(sec0, &sl); 79 if (error) 80 return (error); 81 82 csize = sl.sl_ntracks * sl.sl_nsectors; 83 84 for (i = 0; i < SUN_NPART; i++) { 85 v = sl.sl_part[i].sdkp_cyloffset; 86 u = sl.sl_part[i].sdkp_nsectors; 87 error = g_slice_config(gp, i, G_SLICE_CONFIG_CHECK, 88 ((off_t)v * csize) << 9ULL, 89 ((off_t)u) << 9ULL, 90 ms->sectorsize, 91 "%s%c", gp->name, 'a' + i); 92 if (error) 93 return (error); 94 } 95 for (i = 0; i < SUN_NPART; i++) { 96 v = sl.sl_part[i].sdkp_cyloffset; 97 u = sl.sl_part[i].sdkp_nsectors; 98 g_slice_config(gp, i, G_SLICE_CONFIG_SET, 99 ((off_t)v * csize) << 9ULL, 100 ((off_t)u) << 9ULL, 101 ms->sectorsize, 102 "%s%c", gp->name, 'a' + i); 103 } 104 ms->nalt = sl.sl_acylinders; 105 ms->nheads = sl.sl_ntracks; 106 ms->nsects = sl.sl_nsectors; 107 108 /* 109 * Calculate MD5 from the first sector and use it for avoiding 110 * recursive labels creation. 111 */ 112 MD5Init(&md5sum); 113 MD5Update(&md5sum, sec0, ms->sectorsize); 114 MD5Final(ms->labelsum, &md5sum); 115 116 return (0); 117 } 118 119 static void 120 g_sunlabel_hotwrite(void *arg, int flag) 121 { 122 struct bio *bp; 123 struct g_geom *gp; 124 struct g_slicer *gsp; 125 struct g_slice *gsl; 126 struct g_sunlabel_softc *ms; 127 u_char *p; 128 int error; 129 130 KASSERT(flag != EV_CANCEL, ("g_sunlabel_hotwrite cancelled")); 131 bp = arg; 132 gp = bp->bio_to->geom; 133 gsp = gp->softc; 134 ms = gsp->softc; 135 gsl = &gsp->slices[bp->bio_to->index]; 136 /* 137 * XXX: For all practical purposes, this whould be equvivalent to 138 * XXX: "p = (u_char *)bp->bio_data;" because the label is always 139 * XXX: in the first sector and we refuse sectors smaller than the 140 * XXX: label. 141 */ 142 p = (u_char *)bp->bio_data - (bp->bio_offset + gsl->offset); 143 144 error = g_sunlabel_modify(gp, ms, p); 145 if (error) { 146 g_io_deliver(bp, EPERM); 147 return; 148 } 149 g_slice_finish_hot(bp); 150 } 151 152 static void 153 g_sunlabel_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp) 154 { 155 struct g_slicer *gsp; 156 struct g_sunlabel_softc *ms; 157 158 gsp = gp->softc; 159 ms = gsp->softc; 160 g_slice_dumpconf(sb, indent, gp, cp, pp); 161 if (indent == NULL) { 162 sbuf_printf(sb, " sc %u hd %u alt %u", 163 ms->nsects, ms->nheads, ms->nalt); 164 } 165 } 166 167 struct g_hh01 { 168 struct g_geom *gp; 169 struct g_sunlabel_softc *ms; 170 u_char *label; 171 int error; 172 }; 173 174 static void 175 g_sunlabel_callconfig(void *arg, int flag) 176 { 177 struct g_hh01 *hp; 178 179 hp = arg; 180 hp->error = g_sunlabel_modify(hp->gp, hp->ms, hp->label); 181 if (!hp->error) 182 hp->error = g_write_data(LIST_FIRST(&hp->gp->consumer), 183 0, hp->label, SUN_SIZE); 184 } 185 186 /* 187 * NB! curthread is user process which GCTL'ed. 188 */ 189 static void 190 g_sunlabel_config(struct gctl_req *req, struct g_class *mp, const char *verb) 191 { 192 u_char *label; 193 int error, i; 194 struct g_hh01 h0h0; 195 struct g_slicer *gsp; 196 struct g_geom *gp; 197 struct g_consumer *cp; 198 199 g_topology_assert(); 200 gp = gctl_get_geom(req, mp, "geom"); 201 if (gp == NULL) 202 return; 203 cp = LIST_FIRST(&gp->consumer); 204 gsp = gp->softc; 205 if (!strcmp(verb, "write label")) { 206 label = gctl_get_paraml(req, "label", SUN_SIZE); 207 if (label == NULL) 208 return; 209 h0h0.gp = gp; 210 h0h0.ms = gsp->softc; 211 h0h0.label = label; 212 h0h0.error = -1; 213 /* XXX: Does this reference register with our selfdestruct code ? */ 214 error = g_access(cp, 1, 1, 1); 215 if (error) { 216 gctl_error(req, "could not access consumer"); 217 return; 218 } 219 g_sunlabel_callconfig(&h0h0, 0); 220 g_access(cp, -1, -1, -1); 221 } else if (!strcmp(verb, "write bootcode")) { 222 label = gctl_get_paraml(req, "bootcode", SUN_BOOTSIZE); 223 if (label == NULL) 224 return; 225 /* XXX: Does this reference register with our selfdestruct code ? */ 226 error = g_access(cp, 1, 1, 1); 227 if (error) { 228 gctl_error(req, "could not access consumer"); 229 return; 230 } 231 for (i = 0; i < SUN_NPART; i++) { 232 if (gsp->slices[i].length <= SUN_BOOTSIZE) 233 continue; 234 g_write_data(cp, 235 gsp->slices[i].offset + SUN_SIZE, label + SUN_SIZE, 236 SUN_BOOTSIZE - SUN_SIZE); 237 } 238 g_access(cp, -1, -1, -1); 239 } else { 240 gctl_error(req, "Unknown verb parameter"); 241 } 242 } 243 244 static int 245 g_sunlabel_start(struct bio *bp) 246 { 247 struct g_sunlabel_softc *mp; 248 struct g_slicer *gsp; 249 250 gsp = bp->bio_to->geom->softc; 251 mp = gsp->softc; 252 if (bp->bio_cmd == BIO_GETATTR) { 253 if (g_handleattr(bp, "SUN::labelsum", mp->labelsum, 254 sizeof(mp->labelsum))) 255 return (1); 256 } 257 return (0); 258 } 259 260 static struct g_geom * 261 g_sunlabel_taste(struct g_class *mp, struct g_provider *pp, int flags) 262 { 263 struct g_geom *gp; 264 struct g_consumer *cp; 265 struct g_sunlabel_softc *ms; 266 struct g_slicer *gsp; 267 u_char *buf, hash[16]; 268 MD5_CTX md5sum; 269 int error; 270 271 g_trace(G_T_TOPOLOGY, "g_sunlabel_taste(%s,%s)", mp->name, pp->name); 272 g_topology_assert(); 273 if (flags == G_TF_NORMAL && 274 !strcmp(pp->geom->class->name, SUNLABEL_CLASS_NAME)) 275 return (NULL); 276 gp = g_slice_new(mp, 8, pp, &cp, &ms, sizeof *ms, g_sunlabel_start); 277 if (gp == NULL) 278 return (NULL); 279 gsp = gp->softc; 280 do { 281 ms->sectorsize = cp->provider->sectorsize; 282 if (ms->sectorsize < 512) 283 break; 284 g_topology_unlock(); 285 buf = g_read_data(cp, 0, ms->sectorsize, NULL); 286 g_topology_lock(); 287 if (buf == NULL) 288 break; 289 290 /* 291 * Calculate MD5 from the first sector and use it for avoiding 292 * recursive labels creation. 293 */ 294 MD5Init(&md5sum); 295 MD5Update(&md5sum, buf, ms->sectorsize); 296 MD5Final(ms->labelsum, &md5sum); 297 298 error = g_getattr("SUN::labelsum", cp, &hash); 299 if (!error && !bcmp(ms->labelsum, hash, sizeof(hash))) { 300 g_free(buf); 301 break; 302 } 303 304 g_sunlabel_modify(gp, ms, buf); 305 g_free(buf); 306 307 break; 308 } while (0); 309 g_access(cp, -1, 0, 0); 310 if (LIST_EMPTY(&gp->provider)) { 311 g_slice_spoiled(cp); 312 return (NULL); 313 } 314 g_slice_conf_hot(gp, 0, 0, SUN_SIZE, 315 G_SLICE_HOT_ALLOW, G_SLICE_HOT_DENY, G_SLICE_HOT_CALL); 316 gsp->hot = g_sunlabel_hotwrite; 317 if (!g_sunlabel_once) { 318 g_sunlabel_once = 1; 319 printf( 320 "WARNING: geom_sunlabel (geom %s) is deprecated, " 321 "use gpart instead.\n", gp->name); 322 } 323 return (gp); 324 } 325 326 static struct g_class g_sunlabel_class = { 327 .name = SUNLABEL_CLASS_NAME, 328 .version = G_VERSION, 329 .taste = g_sunlabel_taste, 330 .ctlreq = g_sunlabel_config, 331 .dumpconf = g_sunlabel_dumpconf, 332 }; 333 334 DECLARE_GEOM_CLASS(g_sunlabel_class, g_sunlabel); 335 MODULE_VERSION(geom_sunlabel, 0);
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