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 * Alignment against physical start (verses slice start). We use a megabyte 50 * here. Why do we use a megabyte? Because SSDs already use large 128K 51 * blocks internally (for MLC) and who the hell knows in the future. 52 * 53 * This way if the sysop picks sane values for partition sizes everything 54 * will be nicely aligned, particularly swap for e.g. swapcache, and 55 * clustered operations against larger physical sector sizes for newer HDs, 56 * and so forth. 57 */ 58 #define PALIGN_SIZE (1024 * 1024) 59 #define PALIGN_MASK (PALIGN_SIZE - 1) 60 61 /* 62 * Retrieve the partition start and extent, in blocks. Return 0 on success, 63 * EINVAL on error. 64 */ 65 static int 66 l64_getpartbounds(struct diskslices *ssp, disklabel_t lp, u_int32_t part, 67 u_int64_t *start, u_int64_t *blocks) 68 { 69 struct partition64 *pp; 70 71 if (part >= lp.lab64->d_npartitions) 72 return (EINVAL); 73 74 pp = &lp.lab64->d_partitions[part]; 75 76 if ((pp->p_boffset & (ssp->dss_secsize - 1)) || 77 (pp->p_bsize & (ssp->dss_secsize - 1))) { 78 return (EINVAL); 79 } 80 *start = pp->p_boffset / ssp->dss_secsize; 81 *blocks = pp->p_bsize / ssp->dss_secsize; 82 return(0); 83 } 84 85 /* 86 * Get the filesystem type XXX - diskslices code needs to use uuids 87 */ 88 static void 89 l64_loadpartinfo(disklabel_t lp, u_int32_t part, struct partinfo *dpart) 90 { 91 struct partition64 *pp; 92 const size_t uuid_size = sizeof(struct uuid); 93 94 if (part < lp.lab64->d_npartitions) { 95 pp = &lp.lab64->d_partitions[part]; 96 dpart->fstype_uuid = pp->p_type_uuid; 97 dpart->storage_uuid = pp->p_stor_uuid; 98 dpart->fstype = pp->p_fstype; 99 } else { 100 bzero(&dpart->fstype_uuid, uuid_size); 101 bzero(&dpart->storage_uuid, uuid_size); 102 dpart->fstype = 0; 103 } 104 } 105 106 /* 107 * Get the number of partitions 108 */ 109 static u_int32_t 110 l64_getnumparts(disklabel_t lp) 111 { 112 return(lp.lab64->d_npartitions); 113 } 114 115 static void 116 l64_freedisklabel(disklabel_t *lpp) 117 { 118 kfree((*lpp).lab64, M_DEVBUF); 119 (*lpp).lab64 = NULL; 120 } 121 122 /* 123 * Attempt to read a disk label from a device. 64 bit disklabels are 124 * sector-agnostic and begin at offset 0 on the device. 64 bit disklabels 125 * may only be used with GPT partitioning schemes. 126 * 127 * Returns NULL on sucess, and an error string on failure. 128 */ 129 static const char * 130 l64_readdisklabel(cdev_t dev, struct diskslice *sp, disklabel_t *lpp, 131 struct disk_info *info) 132 { 133 struct buf *bp; 134 struct disklabel64 *dlp; 135 const char *msg; 136 uint32_t savecrc; 137 size_t dlpcrcsize; 138 size_t bpsize; 139 int secsize; 140 141 /* 142 * XXX I/O size is subject to device DMA limitations 143 */ 144 secsize = info->d_media_blksize; 145 bpsize = (sizeof(*dlp) + secsize - 1) & ~(secsize - 1); 146 147 bp = geteblk(bpsize); 148 bp->b_bio1.bio_offset = 0; 149 bp->b_bio1.bio_done = biodone_sync; 150 bp->b_bio1.bio_flags |= BIO_SYNC; 151 bp->b_bcount = bpsize; 152 bp->b_flags &= ~B_INVAL; 153 bp->b_cmd = BUF_CMD_READ; 154 dev_dstrategy(dev, &bp->b_bio1); 155 156 if (biowait(&bp->b_bio1, "labrd")) { 157 msg = "I/O error"; 158 } else { 159 dlp = (struct disklabel64 *)bp->b_data; 160 dlpcrcsize = offsetof(struct disklabel64, 161 d_partitions[dlp->d_npartitions]) - 162 offsetof(struct disklabel64, d_magic); 163 savecrc = dlp->d_crc; 164 dlp->d_crc = 0; 165 if (dlp->d_magic != DISKMAGIC64) { 166 msg = "no disk label"; 167 } else if (dlp->d_npartitions > MAXPARTITIONS64) { 168 msg = "disklabel64 corrupted, too many partitions"; 169 } else if (savecrc != crc32(&dlp->d_magic, dlpcrcsize)) { 170 msg = "disklabel64 corrupted, bad CRC"; 171 } else { 172 dlp->d_crc = savecrc; 173 (*lpp).lab64 = kmalloc(sizeof(*dlp), 174 M_DEVBUF, M_WAITOK|M_ZERO); 175 *(*lpp).lab64 = *dlp; 176 msg = NULL; 177 } 178 } 179 bp->b_flags |= B_INVAL | B_AGE; 180 brelse(bp); 181 return (msg); 182 } 183 184 /* 185 * If everything is good, copy olpx to nlpx. Check to see if any 186 * open partitions would change. 187 */ 188 static int 189 l64_setdisklabel(disklabel_t olpx, disklabel_t nlpx, struct diskslices *ssp, 190 struct diskslice *sp, u_int32_t *openmask) 191 { 192 struct disklabel64 *olp, *nlp; 193 struct partition64 *opp, *npp; 194 uint32_t savecrc; 195 uint64_t slicebsize; 196 size_t nlpcrcsize; 197 int i; 198 199 olp = olpx.lab64; 200 nlp = nlpx.lab64; 201 202 slicebsize = (uint64_t)sp->ds_size * ssp->dss_secsize; 203 204 if (nlp->d_magic != DISKMAGIC64) 205 return (EINVAL); 206 if (nlp->d_npartitions > MAXPARTITIONS64) 207 return (EINVAL); 208 savecrc = nlp->d_crc; 209 nlp->d_crc = 0; 210 nlpcrcsize = offsetof(struct disklabel64, 211 d_partitions[nlp->d_npartitions]) - 212 offsetof(struct disklabel64, d_magic); 213 if (crc32(&nlp->d_magic, nlpcrcsize) != savecrc) { 214 nlp->d_crc = savecrc; 215 return (EINVAL); 216 } 217 nlp->d_crc = savecrc; 218 219 /* 220 * Check if open partitions have changed 221 */ 222 i = 0; 223 while (i < MAXPARTITIONS64) { 224 if (openmask[i >> 5] == 0) { 225 i += 32; 226 continue; 227 } 228 if ((openmask[i >> 5] & (1 << (i & 31))) == 0) { 229 ++i; 230 continue; 231 } 232 if (nlp->d_npartitions <= i) 233 return (EBUSY); 234 opp = &olp->d_partitions[i]; 235 npp = &nlp->d_partitions[i]; 236 if (npp->p_boffset != opp->p_boffset || 237 npp->p_bsize < opp->p_bsize) { 238 return (EBUSY); 239 } 240 241 /* 242 * Do not allow p_type_uuid or p_stor_uuid to change if 243 * the partition is currently open. 244 */ 245 if (bcmp(&npp->p_type_uuid, &opp->p_type_uuid, 246 sizeof(npp->p_type_uuid)) != 0) { 247 return (EBUSY); 248 } 249 if (bcmp(&npp->p_stor_uuid, &opp->p_stor_uuid, 250 sizeof(npp->p_stor_uuid)) != 0) { 251 return (EBUSY); 252 } 253 ++i; 254 } 255 256 /* 257 * Make sure the label and partition offsets and sizes are sane. 258 */ 259 if (nlp->d_total_size > slicebsize) 260 return (ENOSPC); 261 if (nlp->d_total_size & (ssp->dss_secsize - 1)) 262 return (EINVAL); 263 if (nlp->d_bbase & (ssp->dss_secsize - 1)) 264 return (EINVAL); 265 if (nlp->d_pbase & (ssp->dss_secsize - 1)) 266 return (EINVAL); 267 if (nlp->d_pstop & (ssp->dss_secsize - 1)) 268 return (EINVAL); 269 if (nlp->d_abase & (ssp->dss_secsize - 1)) 270 return (EINVAL); 271 272 for (i = 0; i < nlp->d_npartitions; ++i) { 273 npp = &nlp->d_partitions[i]; 274 if (npp->p_bsize == 0) { 275 if (npp->p_boffset != 0) 276 return (EINVAL); 277 continue; 278 } 279 if (npp->p_boffset & (ssp->dss_secsize - 1)) 280 return (EINVAL); 281 if (npp->p_bsize & (ssp->dss_secsize - 1)) 282 return (EINVAL); 283 if (npp->p_boffset < nlp->d_pbase) 284 return (ENOSPC); 285 if (npp->p_boffset + npp->p_bsize > nlp->d_total_size) 286 return (ENOSPC); 287 } 288 289 /* 290 * Structurally we may add code to make modifications above in the 291 * future, so regenerate the crc anyway. 292 */ 293 nlp->d_crc = 0; 294 nlp->d_crc = crc32(&nlp->d_magic, nlpcrcsize); 295 *olp = *nlp; 296 297 return (0); 298 } 299 300 /* 301 * Write disk label back to device after modification. 302 */ 303 static int 304 l64_writedisklabel(cdev_t dev, struct diskslices *ssp, 305 struct diskslice *sp, disklabel_t lpx) 306 { 307 struct disklabel64 *lp; 308 struct disklabel64 *dlp; 309 struct buf *bp; 310 int error = 0; 311 size_t bpsize; 312 int secsize; 313 314 lp = lpx.lab64; 315 316 /* 317 * XXX I/O size is subject to device DMA limitations 318 */ 319 secsize = ssp->dss_secsize; 320 bpsize = (sizeof(*lp) + secsize - 1) & ~(secsize - 1); 321 322 bp = geteblk(bpsize); 323 bp->b_bio1.bio_offset = 0; 324 bp->b_bio1.bio_done = biodone_sync; 325 bp->b_bio1.bio_flags |= BIO_SYNC; 326 bp->b_bcount = bpsize; 327 328 /* 329 * Because our I/O is larger then the label, and because we do not 330 * write the d_reserved0[] area, do a read-modify-write. 331 */ 332 bp->b_flags &= ~B_INVAL; 333 bp->b_cmd = BUF_CMD_READ; 334 KKASSERT(dkpart(dev) == WHOLE_SLICE_PART); 335 dev_dstrategy(dev, &bp->b_bio1); 336 error = biowait(&bp->b_bio1, "labrd"); 337 if (error) 338 goto done; 339 340 dlp = (void *)bp->b_data; 341 bcopy(&lp->d_magic, &dlp->d_magic, 342 sizeof(*lp) - offsetof(struct disklabel64, d_magic)); 343 bp->b_cmd = BUF_CMD_WRITE; 344 bp->b_bio1.bio_done = biodone_sync; 345 bp->b_bio1.bio_flags |= BIO_SYNC; 346 KKASSERT(dkpart(dev) == WHOLE_SLICE_PART); 347 dev_dstrategy(dev, &bp->b_bio1); 348 error = biowait(&bp->b_bio1, "labwr"); 349 done: 350 bp->b_flags |= B_INVAL | B_AGE; 351 brelse(bp); 352 return (error); 353 } 354 355 /* 356 * Create a disklabel based on a disk_info structure for the purposes of 357 * DSO_COMPATLABEL - cases where no real label exists on the storage medium. 358 * 359 * If a diskslice is passed, the label is truncated to the slice. 360 * 361 * NOTE! This is not a legal label because d_bbase and d_pbase are both 362 * set to 0. 363 */ 364 static disklabel_t 365 l64_clone_label(struct disk_info *info, struct diskslice *sp) 366 { 367 struct disklabel64 *lp; 368 disklabel_t res; 369 uint32_t blksize = info->d_media_blksize; 370 size_t lpcrcsize; 371 372 lp = kmalloc(sizeof *lp, M_DEVBUF, M_WAITOK | M_ZERO); 373 374 if (sp) 375 lp->d_total_size = (uint64_t)sp->ds_size * blksize; 376 else 377 lp->d_total_size = info->d_media_blocks * blksize; 378 379 lp->d_magic = DISKMAGIC64; 380 lp->d_align = blksize; 381 lp->d_npartitions = MAXPARTITIONS64; 382 lp->d_pstop = lp->d_total_size; 383 384 /* 385 * Create a dummy 'c' part and a dummy 'a' part (if requested). 386 * Note that the 'c' part is really a hack. 64 bit disklabels 387 * do not use 'c' to mean the raw partition. 388 */ 389 390 lp->d_partitions[2].p_boffset = 0; 391 lp->d_partitions[2].p_bsize = lp->d_total_size; 392 /* XXX SET FS TYPE */ 393 394 if (info->d_dsflags & DSO_COMPATPARTA) { 395 lp->d_partitions[0].p_boffset = 0; 396 lp->d_partitions[0].p_bsize = lp->d_total_size; 397 /* XXX SET FS TYPE */ 398 } 399 400 lpcrcsize = offsetof(struct disklabel64, 401 d_partitions[lp->d_npartitions]) - 402 offsetof(struct disklabel64, d_magic); 403 404 lp->d_crc = crc32(&lp->d_magic, lpcrcsize); 405 res.lab64 = lp; 406 return (res); 407 } 408 409 /* 410 * Create a virgin disklabel64 suitable for writing to the media. 411 * 412 * disklabel64 always reserves 32KB for a boot area and leaves room 413 * for up to RESPARTITIONS64 partitions. 414 */ 415 static void 416 l64_makevirginlabel(disklabel_t lpx, struct diskslices *ssp, 417 struct diskslice *sp, struct disk_info *info) 418 { 419 struct disklabel64 *lp = lpx.lab64; 420 struct partition64 *pp; 421 uint32_t blksize; 422 uint32_t ressize; 423 uint64_t blkmask; /* 64 bits so we can ~ */ 424 size_t lpcrcsize; 425 426 /* 427 * Setup the initial label. Use of a block size of at least 4KB 428 * for calculating the initial reserved areas to allow some degree 429 * of portability between media with different sector sizes. 430 * 431 * Note that the modified blksize is stored in d_align as a hint 432 * to the disklabeling program. 433 */ 434 bzero(lp, sizeof(*lp)); 435 if ((blksize = info->d_media_blksize) < 4096) 436 blksize = 4096; 437 blkmask = blksize - 1; 438 439 if (sp) 440 lp->d_total_size = (uint64_t)sp->ds_size * ssp->dss_secsize; 441 else 442 lp->d_total_size = info->d_media_blocks * info->d_media_blksize; 443 444 lp->d_magic = DISKMAGIC64; 445 lp->d_align = blksize; 446 lp->d_npartitions = MAXPARTITIONS64; 447 kern_uuidgen(&lp->d_stor_uuid, 1); 448 449 ressize = offsetof(struct disklabel64, d_partitions[RESPARTITIONS64]); 450 ressize = (ressize + (uint32_t)blkmask) & ~blkmask; 451 452 /* 453 * NOTE: When calculating pbase take into account the slice offset 454 * so the partitions are at least 32K-aligned relative to the 455 * start of the physical disk. This will accomodate efficient 456 * access to 4096 byte physical sector drives. 457 */ 458 lp->d_bbase = ressize; 459 lp->d_pbase = lp->d_bbase + ((32768 + blkmask) & ~blkmask); 460 lp->d_pbase = (lp->d_pbase + PALIGN_MASK) & ~(uint64_t)PALIGN_MASK; 461 462 /* adjust for slice offset so we are physically aligned */ 463 lp->d_pbase += 32768 - (sp->ds_offset * info->d_media_blksize) % 32768; 464 465 lp->d_pstop = (lp->d_total_size - lp->d_bbase) & ~blkmask; 466 lp->d_abase = lp->d_pstop; 467 468 /* 469 * All partitions are left empty unless DSO_COMPATPARTA is set 470 */ 471 472 if (info->d_dsflags & DSO_COMPATPARTA) { 473 pp = &lp->d_partitions[0]; 474 pp->p_boffset = lp->d_pbase; 475 pp->p_bsize = lp->d_pstop - lp->d_pbase; 476 /* XXX SET FS TYPE */ 477 } 478 479 lpcrcsize = offsetof(struct disklabel64, 480 d_partitions[lp->d_npartitions]) - 481 offsetof(struct disklabel64, d_magic); 482 lp->d_crc = crc32(&lp->d_magic, lpcrcsize); 483 } 484 485 /* 486 * Set the number of blocks at the beginning of the slice which have 487 * been reserved for label operations. This area will be write-protected 488 * when accessed via the slice. 489 * 490 * For now just protect the label area proper. Do not protect the 491 * boot area. Note partitions in 64 bit disklabels do not overlap 492 * the disklabel or boot area. 493 */ 494 static void 495 l64_adjust_label_reserved(struct diskslices *ssp, int slice, 496 struct diskslice *sp) 497 { 498 struct disklabel64 *lp = sp->ds_label.lab64; 499 500 sp->ds_reserved = lp->d_bbase / ssp->dss_secsize; 501 } 502 503 struct disklabel_ops disklabel64_ops = { 504 .labelsize = sizeof(struct disklabel64), 505 .op_readdisklabel = l64_readdisklabel, 506 .op_setdisklabel = l64_setdisklabel, 507 .op_writedisklabel = l64_writedisklabel, 508 .op_clone_label = l64_clone_label, 509 .op_adjust_label_reserved = l64_adjust_label_reserved, 510 .op_getpartbounds = l64_getpartbounds, 511 .op_loadpartinfo = l64_loadpartinfo, 512 .op_getnumparts = l64_getnumparts, 513 .op_makevirginlabel = l64_makevirginlabel, 514 .op_freedisklabel = l64_freedisklabel 515 }; 516 517