1 /* 2 * Copyright (c) 2007 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Matthew Dillon <dillon@backplane.com> 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 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * $DragonFly: src/sys/kern/subr_disklabel64.c,v 1.5 2007/07/20 17:21:51 dillon Exp $ 35 */ 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/kernel.h> 40 #include <sys/conf.h> 41 #include <sys/disklabel.h> 42 #include <sys/disklabel64.h> 43 #include <sys/diskslice.h> 44 #include <sys/disk.h> 45 #include <sys/kern_syscall.h> 46 #include <sys/buf2.h> 47 48 /* 49 * Retrieve the partition start and extent, in blocks. Return 0 on success, 50 * EINVAL on error. 51 */ 52 static int 53 l64_getpartbounds(struct diskslices *ssp, disklabel_t lp, u_int32_t part, 54 u_int64_t *start, u_int64_t *blocks) 55 { 56 struct partition64 *pp; 57 58 if (part >= lp.lab64->d_npartitions) 59 return (EINVAL); 60 61 pp = &lp.lab64->d_partitions[part]; 62 63 if ((pp->p_boffset & (ssp->dss_secsize - 1)) || 64 (pp->p_bsize & (ssp->dss_secsize - 1))) { 65 return (EINVAL); 66 } 67 *start = pp->p_boffset / ssp->dss_secsize; 68 *blocks = pp->p_bsize / ssp->dss_secsize; 69 return(0); 70 } 71 72 /* 73 * Get the filesystem type XXX - diskslices code needs to use uuids 74 */ 75 static void 76 l64_loadpartinfo(disklabel_t lp, u_int32_t part, struct partinfo *dpart) 77 { 78 struct partition64 *pp; 79 const size_t uuid_size = sizeof(struct uuid); 80 81 if (part < lp.lab64->d_npartitions) { 82 pp = &lp.lab64->d_partitions[part]; 83 dpart->fstype_uuid = pp->p_type_uuid; 84 dpart->storage_uuid = pp->p_stor_uuid; 85 dpart->fstype = pp->p_fstype; 86 } else { 87 bzero(&dpart->fstype_uuid, uuid_size); 88 bzero(&dpart->storage_uuid, uuid_size); 89 dpart->fstype = 0; 90 } 91 } 92 93 /* 94 * Get the number of partitions 95 */ 96 static u_int32_t 97 l64_getnumparts(disklabel_t lp) 98 { 99 return(lp.lab64->d_npartitions); 100 } 101 102 /* 103 * Attempt to read a disk label from a device. 64 bit disklabels are 104 * sector-agnostic and begin at offset 0 on the device. 64 bit disklabels 105 * may only be used with GPT partitioning schemes. 106 * 107 * Returns NULL on sucess, and an error string on failure. 108 */ 109 static const char * 110 l64_readdisklabel(cdev_t dev, struct diskslice *sp, disklabel_t *lpp, 111 struct disk_info *info) 112 { 113 struct buf *bp; 114 struct disklabel64 *dlp; 115 const char *msg; 116 uint32_t savecrc; 117 size_t dlpcrcsize; 118 size_t bpsize; 119 int secsize; 120 121 /* 122 * XXX I/O size is subject to device DMA limitations 123 */ 124 secsize = info->d_media_blksize; 125 bpsize = (sizeof(*dlp) + secsize - 1) & ~(secsize - 1); 126 127 bp = geteblk(bpsize); 128 bp->b_bio1.bio_offset = 0; 129 bp->b_bcount = bpsize; 130 bp->b_flags &= ~B_INVAL; 131 bp->b_cmd = BUF_CMD_READ; 132 dev_dstrategy(dev, &bp->b_bio1); 133 134 if (biowait(bp)) { 135 msg = "I/O error"; 136 } else { 137 dlp = (struct disklabel64 *)bp->b_data; 138 dlpcrcsize = offsetof(struct disklabel64, 139 d_partitions[dlp->d_npartitions]) - 140 offsetof(struct disklabel64, d_magic); 141 savecrc = dlp->d_crc; 142 dlp->d_crc = 0; 143 if (dlp->d_magic != DISKMAGIC64) { 144 msg = "no disk label"; 145 } else if (dlp->d_npartitions > MAXPARTITIONS64) { 146 msg = "disklabel64 corrupted, too many partitions"; 147 } else if (savecrc != crc32(&dlp->d_magic, dlpcrcsize)) { 148 msg = "disklabel64 corrupted, bad CRC"; 149 } else { 150 dlp->d_crc = savecrc; 151 (*lpp).lab64 = kmalloc(sizeof(*dlp), 152 M_DEVBUF, M_WAITOK|M_ZERO); 153 *(*lpp).lab64 = *dlp; 154 msg = NULL; 155 } 156 } 157 bp->b_flags |= B_INVAL | B_AGE; 158 brelse(bp); 159 return (msg); 160 } 161 162 /* 163 * If everything is good, copy olpx to nlpx. Check to see if any 164 * open partitions would change. 165 */ 166 static int 167 l64_setdisklabel(disklabel_t olpx, disklabel_t nlpx, struct diskslices *ssp, 168 struct diskslice *sp, u_int32_t *openmask) 169 { 170 struct disklabel64 *olp, *nlp; 171 struct partition64 *opp, *npp; 172 uint32_t savecrc; 173 uint64_t slicebsize; 174 size_t nlpcrcsize; 175 int part; 176 int i; 177 178 olp = olpx.lab64; 179 nlp = nlpx.lab64; 180 181 slicebsize = (uint64_t)sp->ds_size * ssp->dss_secsize; 182 183 if (nlp->d_magic != DISKMAGIC64) 184 return (EINVAL); 185 if (nlp->d_npartitions > MAXPARTITIONS64) 186 return (EINVAL); 187 savecrc = nlp->d_crc; 188 nlp->d_crc = 0; 189 nlpcrcsize = offsetof(struct disklabel64, 190 d_partitions[nlp->d_npartitions]) - 191 offsetof(struct disklabel64, d_magic); 192 if (crc32(&nlp->d_magic, nlpcrcsize) != savecrc) { 193 nlp->d_crc = savecrc; 194 return (EINVAL); 195 } 196 nlp->d_crc = savecrc; 197 198 /* 199 * Check if open partitions have changed 200 */ 201 i = 0; 202 while (i < 128) { 203 if (openmask[i >> 5] == 0) { 204 i += 32; 205 continue; 206 } 207 if ((openmask[i >> 5] & (1 << (i & 31))) == 0) { 208 ++i; 209 continue; 210 } 211 if (nlp->d_npartitions <= i) 212 return (EBUSY); 213 opp = &olp->d_partitions[i]; 214 npp = &nlp->d_partitions[i]; 215 if (npp->p_boffset != opp->p_boffset || 216 npp->p_bsize < opp->p_bsize) { 217 return (EBUSY); 218 } 219 220 /* 221 * Do not allow p_type_uuid or p_stor_uuid to change if 222 * the partition is currently open. 223 */ 224 if (bcmp(&npp->p_type_uuid, &opp->p_type_uuid, 225 sizeof(npp->p_type_uuid)) != 0) { 226 return (EBUSY); 227 } 228 if (bcmp(&npp->p_stor_uuid, &opp->p_stor_uuid, 229 sizeof(npp->p_stor_uuid)) != 0) { 230 return (EBUSY); 231 } 232 ++i; 233 } 234 235 /* 236 * Make sure the label and partition offsets and sizes are sane. 237 */ 238 if (nlp->d_total_size > slicebsize) 239 return (ENOSPC); 240 if (nlp->d_total_size & (ssp->dss_secsize - 1)) 241 return (EINVAL); 242 if (nlp->d_bbase & (ssp->dss_secsize - 1)) 243 return (EINVAL); 244 if (nlp->d_pbase & (ssp->dss_secsize - 1)) 245 return (EINVAL); 246 if (nlp->d_pstop & (ssp->dss_secsize - 1)) 247 return (EINVAL); 248 if (nlp->d_abase & (ssp->dss_secsize - 1)) 249 return (EINVAL); 250 251 for (part = 0; part < nlp->d_npartitions; ++part) { 252 npp = &nlp->d_partitions[i]; 253 if (npp->p_bsize == 0) { 254 if (npp->p_boffset != 0) 255 return (EINVAL); 256 continue; 257 } 258 if (npp->p_boffset & (ssp->dss_secsize - 1)) 259 return (EINVAL); 260 if (npp->p_bsize & (ssp->dss_secsize - 1)) 261 return (EINVAL); 262 if (npp->p_boffset < nlp->d_pbase) 263 return (ENOSPC); 264 if (npp->p_boffset + npp->p_bsize > nlp->d_total_size) 265 return (ENOSPC); 266 } 267 268 /* 269 * Structurally we may add code to make modifications above in the 270 * future, so regenerate the crc anyway. 271 */ 272 nlp->d_crc = 0; 273 nlp->d_crc = crc32(&nlp->d_magic, nlpcrcsize); 274 *olp = *nlp; 275 276 return (0); 277 } 278 279 /* 280 * Write disk label back to device after modification. 281 */ 282 static int 283 l64_writedisklabel(cdev_t dev, struct diskslices *ssp, 284 struct diskslice *sp, disklabel_t lpx) 285 { 286 struct disklabel64 *lp; 287 struct disklabel64 *dlp; 288 struct buf *bp; 289 int error = 0; 290 size_t bpsize; 291 int secsize; 292 293 lp = lpx.lab64; 294 295 /* 296 * XXX I/O size is subject to device DMA limitations 297 */ 298 secsize = ssp->dss_secsize; 299 bpsize = (sizeof(*lp) + secsize - 1) & ~(secsize - 1); 300 301 bp = geteblk(bpsize); 302 bp->b_bio1.bio_offset = 0; 303 bp->b_bcount = bpsize; 304 305 /* 306 * Because our I/O is larger then the label, and because we do not 307 * write the d_reserved0[] area, do a read-modify-write. 308 */ 309 bp->b_flags &= ~B_INVAL; 310 bp->b_cmd = BUF_CMD_READ; 311 dev_dstrategy(dkmodpart(dev, WHOLE_SLICE_PART), &bp->b_bio1); 312 error = biowait(bp); 313 if (error) 314 goto done; 315 316 dlp = (void *)bp->b_data; 317 bcopy(&lp->d_magic, &dlp->d_magic, 318 sizeof(*lp) - offsetof(struct disklabel64, d_magic)); 319 bp->b_cmd = BUF_CMD_WRITE; 320 dev_dstrategy(dkmodpart(dev, WHOLE_SLICE_PART), &bp->b_bio1); 321 error = biowait(bp); 322 done: 323 bp->b_flags |= B_INVAL | B_AGE; 324 brelse(bp); 325 return (error); 326 } 327 328 /* 329 * Create a disklabel based on a disk_info structure for the purposes of 330 * DSO_COMPATLABEL - cases where no real label exists on the storage medium. 331 * 332 * If a diskslice is passed, the label is truncated to the slice. 333 * 334 * NOTE! This is not a legal label because d_bbase and d_pbase are both 335 * set to 0. 336 */ 337 static disklabel_t 338 l64_clone_label(struct disk_info *info, struct diskslice *sp) 339 { 340 struct disklabel64 *lp; 341 disklabel_t res; 342 uint32_t blksize = info->d_media_blksize; 343 size_t lpcrcsize; 344 345 lp = kmalloc(sizeof *lp, M_DEVBUF, M_WAITOK | M_ZERO); 346 347 if (sp) 348 lp->d_total_size = (uint64_t)sp->ds_size * blksize; 349 else 350 lp->d_total_size = info->d_media_blocks * blksize; 351 352 lp->d_magic = DISKMAGIC64; 353 lp->d_align = blksize; 354 lp->d_npartitions = MAXPARTITIONS64; 355 lp->d_pstop = lp->d_total_size; 356 357 /* 358 * Create a dummy 'c' part and a dummy 'a' part (if requested). 359 * Note that the 'c' part is really a hack. 64 bit disklabels 360 * do not use 'c' to mean the raw partition. 361 */ 362 363 lp->d_partitions[2].p_boffset = 0; 364 lp->d_partitions[2].p_bsize = lp->d_total_size; 365 /* XXX SET FS TYPE */ 366 367 if (info->d_dsflags & DSO_COMPATPARTA) { 368 lp->d_partitions[0].p_boffset = 0; 369 lp->d_partitions[0].p_bsize = lp->d_total_size; 370 /* XXX SET FS TYPE */ 371 } 372 373 lpcrcsize = offsetof(struct disklabel64, 374 d_partitions[lp->d_npartitions]) - 375 offsetof(struct disklabel64, d_magic); 376 377 lp->d_crc = crc32(&lp->d_magic, lpcrcsize); 378 res.lab64 = lp; 379 return (res); 380 } 381 382 /* 383 * Create a virgin disklabel64 suitable for writing to the media. 384 * 385 * disklabel64 always reserves 32KB for a boot area and leaves room 386 * for up to RESPARTITIONS64 partitions. 387 */ 388 static void 389 l64_makevirginlabel(disklabel_t lpx, struct diskslices *ssp, 390 struct diskslice *sp, struct disk_info *info) 391 { 392 struct disklabel64 *lp = lpx.lab64; 393 struct partition64 *pp; 394 uint32_t blksize; 395 uint32_t ressize; 396 uint64_t blkmask; /* 64 bits so we can ~ */ 397 size_t lpcrcsize; 398 399 /* 400 * Setup the initial label. Use of a block size of at least 4KB 401 * for calculating the initial reserved areas to allow some degree 402 * of portability between media with different sector sizes. 403 * 404 * Note that the modified blksize is stored in d_align as a hint 405 * to the disklabeling program. 406 */ 407 bzero(lp, sizeof(*lp)); 408 if ((blksize = info->d_media_blksize) < 4096) 409 blksize = 4096; 410 blkmask = blksize - 1; 411 412 if (sp) 413 lp->d_total_size = (uint64_t)sp->ds_size * ssp->dss_secsize; 414 else 415 lp->d_total_size = info->d_media_blocks * info->d_media_blksize; 416 417 lp->d_magic = DISKMAGIC64; 418 lp->d_align = blksize; 419 lp->d_npartitions = MAXPARTITIONS64; 420 kern_uuidgen(&lp->d_stor_uuid, 1); 421 422 ressize = offsetof(struct disklabel64, d_partitions[RESPARTITIONS64]); 423 ressize = (ressize + (uint32_t)blkmask) & ~blkmask; 424 425 lp->d_bbase = ressize; 426 lp->d_pbase = lp->d_bbase + ((32768 + blkmask) & ~blkmask); 427 lp->d_pstop = (lp->d_total_size - lp->d_bbase) & ~blkmask; 428 lp->d_abase = lp->d_pstop; 429 430 /* 431 * All partitions are left empty unless DSO_COMPATPARTA is set 432 */ 433 434 if (info->d_dsflags & DSO_COMPATPARTA) { 435 pp = &lp->d_partitions[0]; 436 pp->p_boffset = lp->d_pbase; 437 pp->p_bsize = lp->d_pstop - lp->d_pbase; 438 /* XXX SET FS TYPE */ 439 } 440 441 lpcrcsize = offsetof(struct disklabel64, 442 d_partitions[lp->d_npartitions]) - 443 offsetof(struct disklabel64, d_magic); 444 lp->d_crc = crc32(&lp->d_magic, lpcrcsize); 445 } 446 447 /* 448 * Set the number of blocks at the beginning of the slice which have 449 * been reserved for label operations. This area will be write-protected 450 * when accessed via the slice. 451 * 452 * For now just protect the label area proper. Do not protect the 453 * boot area. Note partitions in 64 bit disklabels do not overlap 454 * the disklabel or boot area. 455 */ 456 static void 457 l64_adjust_label_reserved(struct diskslices *ssp, int slice, 458 struct diskslice *sp) 459 { 460 struct disklabel64 *lp = sp->ds_label.lab64; 461 462 sp->ds_reserved = lp->d_bbase / ssp->dss_secsize; 463 } 464 465 struct disklabel_ops disklabel64_ops = { 466 .labelsize = sizeof(struct disklabel64), 467 .op_readdisklabel = l64_readdisklabel, 468 .op_setdisklabel = l64_setdisklabel, 469 .op_writedisklabel = l64_writedisklabel, 470 .op_clone_label = l64_clone_label, 471 .op_adjust_label_reserved = l64_adjust_label_reserved, 472 .op_getpartbounds = l64_getpartbounds, 473 .op_loadpartinfo = l64_loadpartinfo, 474 .op_getnumparts = l64_getnumparts, 475 .op_makevirginlabel = l64_makevirginlabel 476 }; 477 478