geom_sunlabel.c revision 223921
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: head/sys/geom/geom_sunlabel.c 223921 2011-07-11 05:22:31Z ae $"); 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 56FEATURE(geom_sunlabel, "GEOM Sun/Solaris partitioning support"); 57 58#define SUNLABEL_CLASS_NAME "SUN" 59 60struct g_sunlabel_softc { 61 int sectorsize; 62 int nheads; 63 int nsects; 64 int nalt; 65 u_char labelsum[16]; 66}; 67 68static int 69g_sunlabel_modify(struct g_geom *gp, struct g_sunlabel_softc *ms, u_char *sec0) 70{ 71 int i, error; 72 u_int u, v, csize; 73 struct sun_disklabel sl; 74 MD5_CTX md5sum; 75 76 error = sunlabel_dec(sec0, &sl); 77 if (error) 78 return (error); 79 80 csize = sl.sl_ntracks * sl.sl_nsectors; 81 82 for (i = 0; i < SUN_NPART; i++) { 83 v = sl.sl_part[i].sdkp_cyloffset; 84 u = sl.sl_part[i].sdkp_nsectors; 85 error = g_slice_config(gp, i, G_SLICE_CONFIG_CHECK, 86 ((off_t)v * csize) << 9ULL, 87 ((off_t)u) << 9ULL, 88 ms->sectorsize, 89 "%s%c", gp->name, 'a' + i); 90 if (error) 91 return (error); 92 } 93 for (i = 0; i < SUN_NPART; i++) { 94 v = sl.sl_part[i].sdkp_cyloffset; 95 u = sl.sl_part[i].sdkp_nsectors; 96 g_slice_config(gp, i, G_SLICE_CONFIG_SET, 97 ((off_t)v * csize) << 9ULL, 98 ((off_t)u) << 9ULL, 99 ms->sectorsize, 100 "%s%c", gp->name, 'a' + i); 101 } 102 ms->nalt = sl.sl_acylinders; 103 ms->nheads = sl.sl_ntracks; 104 ms->nsects = sl.sl_nsectors; 105 106 /* 107 * Calculate MD5 from the first sector and use it for avoiding 108 * recursive labels creation. 109 */ 110 MD5Init(&md5sum); 111 MD5Update(&md5sum, sec0, ms->sectorsize); 112 MD5Final(ms->labelsum, &md5sum); 113 114 return (0); 115} 116 117static void 118g_sunlabel_hotwrite(void *arg, int flag) 119{ 120 struct bio *bp; 121 struct g_geom *gp; 122 struct g_slicer *gsp; 123 struct g_slice *gsl; 124 struct g_sunlabel_softc *ms; 125 u_char *p; 126 int error; 127 128 KASSERT(flag != EV_CANCEL, ("g_sunlabel_hotwrite cancelled")); 129 bp = arg; 130 gp = bp->bio_to->geom; 131 gsp = gp->softc; 132 ms = gsp->softc; 133 gsl = &gsp->slices[bp->bio_to->index]; 134 /* 135 * XXX: For all practical purposes, this whould be equvivalent to 136 * XXX: "p = (u_char *)bp->bio_data;" because the label is always 137 * XXX: in the first sector and we refuse sectors smaller than the 138 * XXX: label. 139 */ 140 p = (u_char *)bp->bio_data - (bp->bio_offset + gsl->offset); 141 142 error = g_sunlabel_modify(gp, ms, p); 143 if (error) { 144 g_io_deliver(bp, EPERM); 145 return; 146 } 147 g_slice_finish_hot(bp); 148} 149 150static void 151g_sunlabel_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp) 152{ 153 struct g_slicer *gsp; 154 struct g_sunlabel_softc *ms; 155 156 gsp = gp->softc; 157 ms = gsp->softc; 158 g_slice_dumpconf(sb, indent, gp, cp, pp); 159 if (indent == NULL) { 160 sbuf_printf(sb, " sc %u hd %u alt %u", 161 ms->nsects, ms->nheads, ms->nalt); 162 } 163} 164 165struct g_hh01 { 166 struct g_geom *gp; 167 struct g_sunlabel_softc *ms; 168 u_char *label; 169 int error; 170}; 171 172static void 173g_sunlabel_callconfig(void *arg, int flag) 174{ 175 struct g_hh01 *hp; 176 177 hp = arg; 178 hp->error = g_sunlabel_modify(hp->gp, hp->ms, hp->label); 179 if (!hp->error) 180 hp->error = g_write_data(LIST_FIRST(&hp->gp->consumer), 181 0, hp->label, SUN_SIZE); 182} 183 184/* 185 * NB! curthread is user process which GCTL'ed. 186 */ 187static void 188g_sunlabel_config(struct gctl_req *req, struct g_class *mp, const char *verb) 189{ 190 u_char *label; 191 int error, i; 192 struct g_hh01 h0h0; 193 struct g_slicer *gsp; 194 struct g_geom *gp; 195 struct g_consumer *cp; 196 197 g_topology_assert(); 198 gp = gctl_get_geom(req, mp, "geom"); 199 if (gp == NULL) 200 return; 201 cp = LIST_FIRST(&gp->consumer); 202 gsp = gp->softc; 203 if (!strcmp(verb, "write label")) { 204 label = gctl_get_paraml(req, "label", SUN_SIZE); 205 if (label == NULL) 206 return; 207 h0h0.gp = gp; 208 h0h0.ms = gsp->softc; 209 h0h0.label = label; 210 h0h0.error = -1; 211 /* XXX: Does this reference register with our selfdestruct code ? */ 212 error = g_access(cp, 1, 1, 1); 213 if (error) { 214 gctl_error(req, "could not access consumer"); 215 return; 216 } 217 g_sunlabel_callconfig(&h0h0, 0); 218 g_access(cp, -1, -1, -1); 219 } else if (!strcmp(verb, "write bootcode")) { 220 label = gctl_get_paraml(req, "bootcode", SUN_BOOTSIZE); 221 if (label == NULL) 222 return; 223 /* XXX: Does this reference register with our selfdestruct code ? */ 224 error = g_access(cp, 1, 1, 1); 225 if (error) { 226 gctl_error(req, "could not access consumer"); 227 return; 228 } 229 for (i = 0; i < SUN_NPART; i++) { 230 if (gsp->slices[i].length <= SUN_BOOTSIZE) 231 continue; 232 g_write_data(cp, 233 gsp->slices[i].offset + SUN_SIZE, label + SUN_SIZE, 234 SUN_BOOTSIZE - SUN_SIZE); 235 } 236 g_access(cp, -1, -1, -1); 237 } else { 238 gctl_error(req, "Unknown verb parameter"); 239 } 240} 241 242static int 243g_sunlabel_start(struct bio *bp) 244{ 245 struct g_sunlabel_softc *mp; 246 struct g_slicer *gsp; 247 248 gsp = bp->bio_to->geom->softc; 249 mp = gsp->softc; 250 if (bp->bio_cmd == BIO_GETATTR) { 251 if (g_handleattr(bp, "SUN::labelsum", mp->labelsum, 252 sizeof(mp->labelsum))) 253 return (1); 254 } 255 return (0); 256} 257 258static struct g_geom * 259g_sunlabel_taste(struct g_class *mp, struct g_provider *pp, int flags) 260{ 261 struct g_geom *gp; 262 struct g_consumer *cp; 263 struct g_sunlabel_softc *ms; 264 struct g_slicer *gsp; 265 u_char *buf, hash[16]; 266 MD5_CTX md5sum; 267 int error; 268 269 g_trace(G_T_TOPOLOGY, "g_sunlabel_taste(%s,%s)", mp->name, pp->name); 270 g_topology_assert(); 271 if (flags == G_TF_NORMAL && 272 !strcmp(pp->geom->class->name, SUNLABEL_CLASS_NAME)) 273 return (NULL); 274 gp = g_slice_new(mp, 8, pp, &cp, &ms, sizeof *ms, g_sunlabel_start); 275 if (gp == NULL) 276 return (NULL); 277 gsp = gp->softc; 278 do { 279 ms->sectorsize = cp->provider->sectorsize; 280 if (ms->sectorsize < 512) 281 break; 282 g_topology_unlock(); 283 buf = g_read_data(cp, 0, ms->sectorsize, NULL); 284 g_topology_lock(); 285 if (buf == NULL) 286 break; 287 288 /* 289 * Calculate MD5 from the first sector and use it for avoiding 290 * recursive labels creation. 291 */ 292 MD5Init(&md5sum); 293 MD5Update(&md5sum, buf, ms->sectorsize); 294 MD5Final(ms->labelsum, &md5sum); 295 296 error = g_getattr("SUN::labelsum", cp, &hash); 297 if (!error && !bcmp(ms->labelsum, hash, sizeof(hash))) { 298 g_free(buf); 299 break; 300 } 301 302 g_sunlabel_modify(gp, ms, buf); 303 g_free(buf); 304 305 break; 306 } while (0); 307 g_access(cp, -1, 0, 0); 308 if (LIST_EMPTY(&gp->provider)) { 309 g_slice_spoiled(cp); 310 return (NULL); 311 } 312 g_slice_conf_hot(gp, 0, 0, SUN_SIZE, 313 G_SLICE_HOT_ALLOW, G_SLICE_HOT_DENY, G_SLICE_HOT_CALL); 314 gsp->hot = g_sunlabel_hotwrite; 315 return (gp); 316} 317 318static struct g_class g_sunlabel_class = { 319 .name = SUNLABEL_CLASS_NAME, 320 .version = G_VERSION, 321 .taste = g_sunlabel_taste, 322 .ctlreq = g_sunlabel_config, 323 .dumpconf = g_sunlabel_dumpconf, 324}; 325 326DECLARE_GEOM_CLASS(g_sunlabel_class, g_sunlabel); 327