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_bio1.bio_done = biodone_sync; 130 bp->b_bio1.bio_flags |= BIO_SYNC; 131 bp->b_bcount = bpsize; 132 bp->b_flags &= ~B_INVAL; 133 bp->b_cmd = BUF_CMD_READ; 134 dev_dstrategy(dev, &bp->b_bio1); 135 136 if (biowait(&bp->b_bio1, "labrd")) { 137 msg = "I/O error"; 138 } else { 139 dlp = (struct disklabel64 *)bp->b_data; 140 dlpcrcsize = offsetof(struct disklabel64, 141 d_partitions[dlp->d_npartitions]) - 142 offsetof(struct disklabel64, d_magic); 143 savecrc = dlp->d_crc; 144 dlp->d_crc = 0; 145 if (dlp->d_magic != DISKMAGIC64) { 146 msg = "no disk label"; 147 } else if (dlp->d_npartitions > MAXPARTITIONS64) { 148 msg = "disklabel64 corrupted, too many partitions"; 149 } else if (savecrc != crc32(&dlp->d_magic, dlpcrcsize)) { 150 msg = "disklabel64 corrupted, bad CRC"; 151 } else { 152 dlp->d_crc = savecrc; 153 (*lpp).lab64 = kmalloc(sizeof(*dlp), 154 M_DEVBUF, M_WAITOK|M_ZERO); 155 *(*lpp).lab64 = *dlp; 156 msg = NULL; 157 } 158 } 159 bp->b_flags |= B_INVAL | B_AGE; 160 brelse(bp); 161 return (msg); 162 } 163 164 /* 165 * If everything is good, copy olpx to nlpx. Check to see if any 166 * open partitions would change. 167 */ 168 static int 169 l64_setdisklabel(disklabel_t olpx, disklabel_t nlpx, struct diskslices *ssp, 170 struct diskslice *sp, u_int32_t *openmask) 171 { 172 struct disklabel64 *olp, *nlp; 173 struct partition64 *opp, *npp; 174 uint32_t savecrc; 175 uint64_t slicebsize; 176 size_t nlpcrcsize; 177 int i; 178 179 olp = olpx.lab64; 180 nlp = nlpx.lab64; 181 182 slicebsize = (uint64_t)sp->ds_size * ssp->dss_secsize; 183 184 if (nlp->d_magic != DISKMAGIC64) 185 return (EINVAL); 186 if (nlp->d_npartitions > MAXPARTITIONS64) 187 return (EINVAL); 188 savecrc = nlp->d_crc; 189 nlp->d_crc = 0; 190 nlpcrcsize = offsetof(struct disklabel64, 191 d_partitions[nlp->d_npartitions]) - 192 offsetof(struct disklabel64, d_magic); 193 if (crc32(&nlp->d_magic, nlpcrcsize) != savecrc) { 194 nlp->d_crc = savecrc; 195 return (EINVAL); 196 } 197 nlp->d_crc = savecrc; 198 199 /* 200 * Check if open partitions have changed 201 */ 202 i = 0; 203 while (i < MAXPARTITIONS64) { 204 if (openmask[i >> 5] == 0) { 205 i += 32; 206 continue; 207 } 208 if ((openmask[i >> 5] & (1 << (i & 31))) == 0) { 209 ++i; 210 continue; 211 } 212 if (nlp->d_npartitions <= i) 213 return (EBUSY); 214 opp = &olp->d_partitions[i]; 215 npp = &nlp->d_partitions[i]; 216 if (npp->p_boffset != opp->p_boffset || 217 npp->p_bsize < opp->p_bsize) { 218 return (EBUSY); 219 } 220 221 /* 222 * Do not allow p_type_uuid or p_stor_uuid to change if 223 * the partition is currently open. 224 */ 225 if (bcmp(&npp->p_type_uuid, &opp->p_type_uuid, 226 sizeof(npp->p_type_uuid)) != 0) { 227 return (EBUSY); 228 } 229 if (bcmp(&npp->p_stor_uuid, &opp->p_stor_uuid, 230 sizeof(npp->p_stor_uuid)) != 0) { 231 return (EBUSY); 232 } 233 ++i; 234 } 235 236 /* 237 * Make sure the label and partition offsets and sizes are sane. 238 */ 239 if (nlp->d_total_size > slicebsize) 240 return (ENOSPC); 241 if (nlp->d_total_size & (ssp->dss_secsize - 1)) 242 return (EINVAL); 243 if (nlp->d_bbase & (ssp->dss_secsize - 1)) 244 return (EINVAL); 245 if (nlp->d_pbase & (ssp->dss_secsize - 1)) 246 return (EINVAL); 247 if (nlp->d_pstop & (ssp->dss_secsize - 1)) 248 return (EINVAL); 249 if (nlp->d_abase & (ssp->dss_secsize - 1)) 250 return (EINVAL); 251 252 for (i = 0; i < nlp->d_npartitions; ++i) { 253 npp = &nlp->d_partitions[i]; 254 if (npp->p_bsize == 0) { 255 if (npp->p_boffset != 0) 256 return (EINVAL); 257 continue; 258 } 259 if (npp->p_boffset & (ssp->dss_secsize - 1)) 260 return (EINVAL); 261 if (npp->p_bsize & (ssp->dss_secsize - 1)) 262 return (EINVAL); 263 if (npp->p_boffset < nlp->d_pbase) 264 return (ENOSPC); 265 if (npp->p_boffset + npp->p_bsize > nlp->d_total_size) 266 return (ENOSPC); 267 } 268 269 /* 270 * Structurally we may add code to make modifications above in the 271 * future, so regenerate the crc anyway. 272 */ 273 nlp->d_crc = 0; 274 nlp->d_crc = crc32(&nlp->d_magic, nlpcrcsize); 275 *olp = *nlp; 276 277 return (0); 278 } 279 280 /* 281 * Write disk label back to device after modification. 282 */ 283 static int 284 l64_writedisklabel(cdev_t dev, struct diskslices *ssp, 285 struct diskslice *sp, disklabel_t lpx) 286 { 287 struct disklabel64 *lp; 288 struct disklabel64 *dlp; 289 struct buf *bp; 290 int error = 0; 291 size_t bpsize; 292 int secsize; 293 294 lp = lpx.lab64; 295 296 /* 297 * XXX I/O size is subject to device DMA limitations 298 */ 299 secsize = ssp->dss_secsize; 300 bpsize = (sizeof(*lp) + secsize - 1) & ~(secsize - 1); 301 302 bp = geteblk(bpsize); 303 bp->b_bio1.bio_offset = 0; 304 bp->b_bio1.bio_done = biodone_sync; 305 bp->b_bio1.bio_flags |= BIO_SYNC; 306 bp->b_bcount = bpsize; 307 308 /* 309 * Because our I/O is larger then the label, and because we do not 310 * write the d_reserved0[] area, do a read-modify-write. 311 */ 312 bp->b_flags &= ~B_INVAL; 313 bp->b_cmd = BUF_CMD_READ; 314 KKASSERT(dkpart(dev) == WHOLE_SLICE_PART); 315 dev_dstrategy(dev, &bp->b_bio1); 316 error = biowait(&bp->b_bio1, "labrd"); 317 if (error) 318 goto done; 319 320 dlp = (void *)bp->b_data; 321 bcopy(&lp->d_magic, &dlp->d_magic, 322 sizeof(*lp) - offsetof(struct disklabel64, d_magic)); 323 bp->b_cmd = BUF_CMD_WRITE; 324 bp->b_bio1.bio_done = biodone_sync; 325 bp->b_bio1.bio_flags |= BIO_SYNC; 326 KKASSERT(dkpart(dev) == WHOLE_SLICE_PART); 327 dev_dstrategy(dev, &bp->b_bio1); 328 error = biowait(&bp->b_bio1, "labwr"); 329 done: 330 bp->b_flags |= B_INVAL | B_AGE; 331 brelse(bp); 332 return (error); 333 } 334 335 /* 336 * Create a disklabel based on a disk_info structure for the purposes of 337 * DSO_COMPATLABEL - cases where no real label exists on the storage medium. 338 * 339 * If a diskslice is passed, the label is truncated to the slice. 340 * 341 * NOTE! This is not a legal label because d_bbase and d_pbase are both 342 * set to 0. 343 */ 344 static disklabel_t 345 l64_clone_label(struct disk_info *info, struct diskslice *sp) 346 { 347 struct disklabel64 *lp; 348 disklabel_t res; 349 uint32_t blksize = info->d_media_blksize; 350 size_t lpcrcsize; 351 352 lp = kmalloc(sizeof *lp, M_DEVBUF, M_WAITOK | M_ZERO); 353 354 if (sp) 355 lp->d_total_size = (uint64_t)sp->ds_size * blksize; 356 else 357 lp->d_total_size = info->d_media_blocks * blksize; 358 359 lp->d_magic = DISKMAGIC64; 360 lp->d_align = blksize; 361 lp->d_npartitions = MAXPARTITIONS64; 362 lp->d_pstop = lp->d_total_size; 363 364 /* 365 * Create a dummy 'c' part and a dummy 'a' part (if requested). 366 * Note that the 'c' part is really a hack. 64 bit disklabels 367 * do not use 'c' to mean the raw partition. 368 */ 369 370 lp->d_partitions[2].p_boffset = 0; 371 lp->d_partitions[2].p_bsize = lp->d_total_size; 372 /* XXX SET FS TYPE */ 373 374 if (info->d_dsflags & DSO_COMPATPARTA) { 375 lp->d_partitions[0].p_boffset = 0; 376 lp->d_partitions[0].p_bsize = lp->d_total_size; 377 /* XXX SET FS TYPE */ 378 } 379 380 lpcrcsize = offsetof(struct disklabel64, 381 d_partitions[lp->d_npartitions]) - 382 offsetof(struct disklabel64, d_magic); 383 384 lp->d_crc = crc32(&lp->d_magic, lpcrcsize); 385 res.lab64 = lp; 386 return (res); 387 } 388 389 /* 390 * Create a virgin disklabel64 suitable for writing to the media. 391 * 392 * disklabel64 always reserves 32KB for a boot area and leaves room 393 * for up to RESPARTITIONS64 partitions. 394 */ 395 static void 396 l64_makevirginlabel(disklabel_t lpx, struct diskslices *ssp, 397 struct diskslice *sp, struct disk_info *info) 398 { 399 struct disklabel64 *lp = lpx.lab64; 400 struct partition64 *pp; 401 uint32_t blksize; 402 uint32_t ressize; 403 uint64_t blkmask; /* 64 bits so we can ~ */ 404 size_t lpcrcsize; 405 406 /* 407 * Setup the initial label. Use of a block size of at least 4KB 408 * for calculating the initial reserved areas to allow some degree 409 * of portability between media with different sector sizes. 410 * 411 * Note that the modified blksize is stored in d_align as a hint 412 * to the disklabeling program. 413 */ 414 bzero(lp, sizeof(*lp)); 415 if ((blksize = info->d_media_blksize) < 4096) 416 blksize = 4096; 417 blkmask = blksize - 1; 418 419 if (sp) 420 lp->d_total_size = (uint64_t)sp->ds_size * ssp->dss_secsize; 421 else 422 lp->d_total_size = info->d_media_blocks * info->d_media_blksize; 423 424 lp->d_magic = DISKMAGIC64; 425 lp->d_align = blksize; 426 lp->d_npartitions = MAXPARTITIONS64; 427 kern_uuidgen(&lp->d_stor_uuid, 1); 428 429 ressize = offsetof(struct disklabel64, d_partitions[RESPARTITIONS64]); 430 ressize = (ressize + (uint32_t)blkmask) & ~blkmask; 431 432 lp->d_bbase = ressize; 433 lp->d_pbase = lp->d_bbase + ((32768 + blkmask) & ~blkmask); 434 lp->d_pstop = (lp->d_total_size - lp->d_bbase) & ~blkmask; 435 lp->d_abase = lp->d_pstop; 436 437 /* 438 * All partitions are left empty unless DSO_COMPATPARTA is set 439 */ 440 441 if (info->d_dsflags & DSO_COMPATPARTA) { 442 pp = &lp->d_partitions[0]; 443 pp->p_boffset = lp->d_pbase; 444 pp->p_bsize = lp->d_pstop - lp->d_pbase; 445 /* XXX SET FS TYPE */ 446 } 447 448 lpcrcsize = offsetof(struct disklabel64, 449 d_partitions[lp->d_npartitions]) - 450 offsetof(struct disklabel64, d_magic); 451 lp->d_crc = crc32(&lp->d_magic, lpcrcsize); 452 } 453 454 /* 455 * Set the number of blocks at the beginning of the slice which have 456 * been reserved for label operations. This area will be write-protected 457 * when accessed via the slice. 458 * 459 * For now just protect the label area proper. Do not protect the 460 * boot area. Note partitions in 64 bit disklabels do not overlap 461 * the disklabel or boot area. 462 */ 463 static void 464 l64_adjust_label_reserved(struct diskslices *ssp, int slice, 465 struct diskslice *sp) 466 { 467 struct disklabel64 *lp = sp->ds_label.lab64; 468 469 sp->ds_reserved = lp->d_bbase / ssp->dss_secsize; 470 } 471 472 struct disklabel_ops disklabel64_ops = { 473 .labelsize = sizeof(struct disklabel64), 474 .op_readdisklabel = l64_readdisklabel, 475 .op_setdisklabel = l64_setdisklabel, 476 .op_writedisklabel = l64_writedisklabel, 477 .op_clone_label = l64_clone_label, 478 .op_adjust_label_reserved = l64_adjust_label_reserved, 479 .op_getpartbounds = l64_getpartbounds, 480 .op_loadpartinfo = l64_loadpartinfo, 481 .op_getnumparts = l64_getnumparts, 482 .op_makevirginlabel = l64_makevirginlabel 483 }; 484 485