stand/common/disk.c

   1 /*-
   2  * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
   3  * Copyright (c) 2012 Andrey V. Elsukov <ae@FreeBSD.org>
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  */
  27
  28 #include <sys/disk.h>
  29 #include <sys/queue.h>
  30 #include <stand.h>
  31 #include <stdarg.h>
  32 #include <bootstrap.h>
  33 #include <part.h>
  34 #include <assert.h>
  35
  36 #include "disk.h"
  37
  38 #ifdef DISK_DEBUG
  39 # define DPRINTF(fmt, args...)  printf("%s: " fmt "\n" , __func__ , ## args)
  40 #else
  41 # define DPRINTF(fmt, args...)  ((void)0)
  42 #endif
  43
  44 struct open_disk {
  45         struct ptable           *table;
  46         uint64_t                mediasize;
  47         uint64_t                entrysize;
  48         u_int                   sectorsize;
  49 };
  50
  51 struct print_args {
  52         struct disk_devdesc     *dev;
  53         const char              *prefix;
  54         int                     verbose;
  55 };
  56
  57 /* Convert size to a human-readable number. */
  58 static char *
  59 display_size(uint64_t size, u_int sectorsize)
  60 {
  61         static char buf[80];
  62         char unit;
  63
  64         size = size * sectorsize / 1024;
  65         unit = 'K';
  66         if (size >= 10485760000LL) {
  67                 size /= 1073741824;
  68                 unit = 'T';
  69         } else if (size >= 10240000) {
  70                 size /= 1048576;
  71                 unit = 'G';
  72         } else if (size >= 10000) {
  73                 size /= 1024;
  74                 unit = 'M';
  75         }
  76         snprintf(buf, sizeof(buf), "%4ld%cB", (long)size, unit);
  77         return (buf);
  78 }
  79
  80 int
  81 ptblread(void *d, void *buf, size_t blocks, uint64_t offset)
  82 {
  83         struct disk_devdesc *dev;
  84         struct open_disk *od;
  85
  86         dev = (struct disk_devdesc *)d;
  87         od = (struct open_disk *)dev->dd.d_opendata;
  88
  89         /*
  90          * The strategy function assumes the offset is in units of 512 byte
  91          * sectors. For larger sector sizes, we need to adjust the offset to
  92          * match the actual sector size.
  93          */
  94         offset *= (od->sectorsize / 512);
  95         /*
  96          * As the GPT backup partition is located at the end of the disk,
  97          * to avoid reading past disk end, flag bcache not to use RA.
  98          */
  99         return (dev->dd.d_dev->dv_strategy(dev, F_READ | F_NORA, offset,
 100             blocks * od->sectorsize, (char *)buf, NULL));
 101 }
 102
 103 static int
 104 ptable_print(void *arg, const char *pname, const struct ptable_entry *part)
 105 {
 106         struct disk_devdesc dev;
 107         struct print_args *pa, bsd;
 108         struct open_disk *od;
 109         struct ptable *table;
 110         char line[80];
 111         int res;
 112         u_int sectsize;
 113         uint64_t partsize;
 114
 115         pa = (struct print_args *)arg;
 116         od = (struct open_disk *)pa->dev->dd.d_opendata;
 117         sectsize = od->sectorsize;
 118         partsize = part->end - part->start + 1;
 119         snprintf(line, sizeof(line), "  %s%s: %s", pa->prefix, pname,
 120             parttype2str(part->type));
 121         if (pager_output(line))
 122                 return (1);
 123
 124         if (pa->verbose) {
 125                 /* Emit extra tab when the line is shorter than 3 tab stops */
 126                 if (strlen(line) < 24)
 127                         (void) pager_output("\t");
 128
 129                 snprintf(line, sizeof(line), "\t%s",
 130                     display_size(partsize, sectsize));
 131                 if (pager_output(line))
 132                         return (1);
 133         }
 134         if (pager_output("\n"))
 135                 return (1);
 136
 137         res = 0;
 138         if (part->type == PART_FREEBSD) {
 139                 /* Open slice with BSD label */
 140                 dev.dd.d_dev = pa->dev->dd.d_dev;
 141                 dev.dd.d_unit = pa->dev->dd.d_unit;
 142                 dev.d_slice = part->index;
 143                 dev.d_partition = D_PARTNONE;
 144                 if (disk_open(&dev, partsize, sectsize) == 0) {
 145                         table = ptable_open(&dev, partsize, sectsize, ptblread);
 146                         if (table != NULL) {
 147                                 snprintf(line, sizeof(line), "  %s%s",
 148                                     pa->prefix, pname);
 149                                 bsd.dev = pa->dev;
 150                                 bsd.prefix = line;
 151                                 bsd.verbose = pa->verbose;
 152                                 res = ptable_iterate(table, &bsd, ptable_print);
 153                                 ptable_close(table);
 154                         }
 155                         disk_close(&dev);
 156                 }
 157         }
 158
 159         return (res);
 160 }
 161
 162 int
 163 disk_print(struct disk_devdesc *dev, char *prefix, int verbose)
 164 {
 165         struct open_disk *od;
 166         struct print_args pa;
 167
 168         /* Disk should be opened */
 169         od = (struct open_disk *)dev->dd.d_opendata;
 170         pa.dev = dev;
 171         pa.prefix = prefix;
 172         pa.verbose = verbose;
 173         return (ptable_iterate(od->table, &pa, ptable_print));
 174 }
 175
 176 int
 177 disk_read(struct disk_devdesc *dev, void *buf, uint64_t offset, u_int blocks)
 178 {
 179         struct open_disk *od;
 180         int ret;
 181
 182         od = (struct open_disk *)dev->dd.d_opendata;
 183         ret = dev->dd.d_dev->dv_strategy(dev, F_READ, dev->d_offset + offset,
 184             blocks * od->sectorsize, buf, NULL);
 185
 186         return (ret);
 187 }
 188
 189 int
 190 disk_write(struct disk_devdesc *dev, void *buf, uint64_t offset, u_int blocks)
 191 {
 192         struct open_disk *od;
 193         int ret;
 194
 195         od = (struct open_disk *)dev->dd.d_opendata;
 196         ret = dev->dd.d_dev->dv_strategy(dev, F_WRITE, dev->d_offset + offset,
 197             blocks * od->sectorsize, buf, NULL);
 198
 199         return (ret);
 200 }
 201
 202 int
 203 disk_ioctl(struct disk_devdesc *dev, u_long cmd, void *data)
 204 {
 205         struct open_disk *od = dev->dd.d_opendata;
 206
 207         if (od == NULL)
 208                 return (ENOTTY);
 209
 210         switch (cmd) {
 211         case DIOCGSECTORSIZE:
 212                 *(u_int *)data = od->sectorsize;
 213                 break;
 214         case DIOCGMEDIASIZE:
 215                 if (dev->d_offset == 0)
 216                         *(uint64_t *)data = od->mediasize;
 217                 else
 218                         *(uint64_t *)data = od->entrysize * od->sectorsize;
 219                 break;
 220         default:
 221                 return (ENOTTY);
 222         }
 223
 224         return (0);
 225 }
 226
 227 int
 228 disk_open(struct disk_devdesc *dev, uint64_t mediasize, u_int sectorsize)
 229 {
 230         struct disk_devdesc partdev;
 231         struct open_disk *od;
 232         struct ptable *table;
 233         struct ptable_entry part;
 234         int rc, slice, partition;
 235
 236         if (sectorsize == 0) {
 237                 DPRINTF("unknown sector size");
 238                 return (ENXIO);
 239         }
 240         rc = 0;
 241         od = (struct open_disk *)malloc(sizeof(struct open_disk));
 242         if (od == NULL) {
 243                 DPRINTF("no memory");
 244                 return (ENOMEM);
 245         }
 246         dev->dd.d_opendata = od;
 247         od->entrysize = 0;
 248         od->mediasize = mediasize;
 249         od->sectorsize = sectorsize;
 250         /*
 251          * While we are reading disk metadata, make sure we do it relative
 252          * to the start of the disk
 253          */
 254         memcpy(&partdev, dev, sizeof(partdev));
 255         partdev.d_offset = 0;
 256         partdev.d_slice = D_SLICENONE;
 257         partdev.d_partition = D_PARTNONE;
 258
 259         dev->d_offset = 0;
 260         table = NULL;
 261         slice = dev->d_slice;
 262         partition = dev->d_partition;
 263
 264         DPRINTF("%s unit %d, slice %d, partition %d => %p", disk_fmtdev(dev),
 265             dev->dd.d_unit, dev->d_slice, dev->d_partition, od);
 266
 267         /* Determine disk layout. */
 268         od->table = ptable_open(&partdev, mediasize / sectorsize, sectorsize,
 269             ptblread);
 270         if (od->table == NULL) {
 271                 DPRINTF("Can't read partition table");
 272                 rc = ENXIO;
 273                 goto out;
 274         }
 275
 276         if (ptable_getsize(od->table, &mediasize) != 0) {
 277                 rc = ENXIO;
 278                 goto out;
 279         }
 280         od->mediasize = mediasize;
 281
 282         if (ptable_gettype(od->table) == PTABLE_BSD &&
 283             partition >= 0) {
 284                 /* It doesn't matter what value has d_slice */
 285                 rc = ptable_getpart(od->table, &part, partition);
 286                 if (rc == 0) {
 287                         dev->d_offset = part.start;
 288                         od->entrysize = part.end - part.start + 1;
 289                 }
 290         } else if (ptable_gettype(od->table) == PTABLE_ISO9660) {
 291                 dev->d_offset = 0;
 292                 od->entrysize = mediasize;
 293         } else if (slice >= 0) {
 294                 /* Try to get information about partition */
 295                 if (slice == 0)
 296                         rc = ptable_getbestpart(od->table, &part);
 297                 else
 298                         rc = ptable_getpart(od->table, &part, slice);
 299                 if (rc != 0) /* Partition doesn't exist */
 300                         goto out;
 301                 dev->d_offset = part.start;
 302                 od->entrysize = part.end - part.start + 1;
 303                 slice = part.index;
 304                 if (ptable_gettype(od->table) == PTABLE_GPT) {
 305                         partition = D_PARTISGPT;
 306                         goto out; /* Nothing more to do */
 307                 } else if (partition == D_PARTISGPT) {
 308                         /*
 309                          * When we try to open GPT partition, but partition
 310                          * table isn't GPT, reset partition value to
 311                          * D_PARTWILD and try to autodetect appropriate value.
 312                          */
 313                         partition = D_PARTWILD;
 314                 }
 315
 316                 /*
 317                  * If partition is D_PARTNONE, then disk_open() was called
 318                  * to open raw MBR slice.
 319                  */
 320                 if (partition == D_PARTNONE)
 321                         goto out;
 322
 323                 /*
 324                  * If partition is D_PARTWILD and we are looking at a BSD slice,
 325                  * then try to read BSD label, otherwise return the
 326                  * whole MBR slice.
 327                  */
 328                 if (partition == D_PARTWILD &&
 329                     part.type != PART_FREEBSD)
 330                         goto out;
 331                 /* Try to read BSD label */
 332                 table = ptable_open(dev, part.end - part.start + 1,
 333                     od->sectorsize, ptblread);
 334                 if (table == NULL) {
 335                         DPRINTF("Can't read BSD label");
 336                         rc = ENXIO;
 337                         goto out;
 338                 }
 339                 /*
 340                  * If slice contains BSD label and partition < 0, then
 341                  * assume the 'a' partition. Otherwise just return the
 342                  * whole MBR slice, because it can contain ZFS.
 343                  */
 344                 if (partition < 0) {
 345                         if (ptable_gettype(table) != PTABLE_BSD)
 346                                 goto out;
 347                         partition = 0;
 348                 }
 349                 rc = ptable_getpart(table, &part, partition);
 350                 if (rc != 0)
 351                         goto out;
 352                 dev->d_offset += part.start;
 353                 od->entrysize = part.end - part.start + 1;
 354         }
 355 out:
 356         if (table != NULL)
 357                 ptable_close(table);
 358
 359         if (rc != 0) {
 360                 if (od->table != NULL)
 361                         ptable_close(od->table);
 362                 free(od);
 363                 DPRINTF("%s could not open", disk_fmtdev(dev));
 364         } else {
 365                 /* Save the slice and partition number to the dev */
 366                 dev->d_slice = slice;
 367                 dev->d_partition = partition;
 368                 DPRINTF("%s offset %lld => %p", disk_fmtdev(dev),
 369                     (long long)dev->d_offset, od);
 370         }
 371         return (rc);
 372 }
 373
 374 int
 375 disk_close(struct disk_devdesc *dev)
 376 {
 377         struct open_disk *od;
 378
 379         od = (struct open_disk *)dev->dd.d_opendata;
 380         DPRINTF("%s closed => %p", disk_fmtdev(dev), od);
 381         ptable_close(od->table);
 382         free(od);
 383         return (0);
 384 }
 385
 386 char *
 387 disk_fmtdev(struct devdesc *vdev)
 388 {
 389         struct disk_devdesc *dev = (struct disk_devdesc *)vdev;
 390         static char buf[128];
 391         char *cp;
 392
 393         assert(vdev->d_dev->dv_type == DEVT_DISK);
 394         cp = buf + sprintf(buf, "%s%d", dev->dd.d_dev->dv_name, dev->dd.d_unit);
 395         if (dev->d_slice > D_SLICENONE) {
 396 #ifdef LOADER_GPT_SUPPORT
 397                 if (dev->d_partition == D_PARTISGPT) {
 398                         sprintf(cp, "p%d:", dev->d_slice);
 399                         return (buf);
 400                 } else
 401 #endif
 402 #ifdef LOADER_MBR_SUPPORT
 403                         cp += sprintf(cp, "s%d", dev->d_slice);
 404 #endif
 405         }
 406         if (dev->d_partition > D_PARTNONE)
 407                 cp += sprintf(cp, "%c", dev->d_partition + 'a');
 408         strcat(cp, ":");
 409         return (buf);
 410 }
 411
 412 int
 413 disk_parsedev(struct devdesc **idev, const char *devspec, const char **path)
 414 {
 415         int unit, slice, partition;
 416         const char *np;
 417         char *cp;
 418         struct disk_devdesc *dev;
 419
 420         np = devspec + 4;       /* Skip the leading 'disk' */
 421         unit = -1;
 422         /*
 423          * If there is path/file info after the device info, then any missing
 424          * slice or partition info should be considered a request to search for
 425          * an appropriate partition.  Otherwise we want to open the raw device
 426          * itself and not try to fill in missing info by searching.
 427          */
 428         if ((cp = strchr(np, ':')) != NULL && cp[1] != '\0') {
 429                 slice = D_SLICEWILD;
 430                 partition = D_PARTWILD;
 431         } else {
 432                 slice = D_SLICENONE;
 433                 partition = D_PARTNONE;
 434         }
 435
 436         if (*np != '\0' && *np != ':') {
 437                 unit = strtol(np, &cp, 10);
 438                 if (cp == np)
 439                         return (EUNIT);
 440 #ifdef LOADER_GPT_SUPPORT
 441                 if (*cp == 'p') {
 442                         np = cp + 1;
 443                         slice = strtol(np, &cp, 10);
 444                         if (np == cp)
 445                                 return (ESLICE);
 446                         /* we don't support nested partitions on GPT */
 447                         if (*cp != '\0' && *cp != ':')
 448                                 return (EINVAL);
 449                         partition = D_PARTISGPT;
 450                 } else
 451 #endif
 452 #ifdef LOADER_MBR_SUPPORT
 453                 if (*cp == 's') {
 454                         np = cp + 1;
 455                         slice = strtol(np, &cp, 10);
 456                         if (np == cp)
 457                                 return (ESLICE);
 458                 }
 459 #endif
 460                 if (*cp != '\0' && *cp != ':') {
 461                         partition = *cp - 'a';
 462                         if (partition < 0)
 463                                 return (EPART);
 464                         cp++;
 465                 }
 466         } else
 467                 return (EINVAL);
 468
 469         if (*cp != '\0' && *cp != ':')
 470                 return (EINVAL);
 471         dev = malloc(sizeof(*dev));
 472         if (dev == NULL)
 473                 return (ENOMEM);
 474         dev->dd.d_unit = unit;
 475         dev->d_slice = slice;
 476         dev->d_partition = partition;
 477         *idev = &dev->dd;
 478         if (path != NULL)
 479                 *path = (*cp == '\0') ? cp: cp + 1;
 480         return (0);
 481 }