fs/partitions/check.c

   1 /*
   2  *  fs/partitions/check.c
   3  *
   4  *  Code extracted from drivers/block/genhd.c
   5  *  Copyright (C) 1991-1998  Linus Torvalds
   6  *  Re-organised Feb 1998 Russell King
   7  *
   8  *  We now have independent partition support from the
   9  *  block drivers, which allows all the partition code to
  10  *  be grouped in one location, and it to be mostly self
  11  *  contained.
  12  *
  13  *  Added needed MAJORS for new pairs, {hdi,hdj}, {hdk,hdl}
  14  */
  15
  16 #include <linux/init.h>
  17 #include <linux/module.h>
  18 #include <linux/fs.h>
  19 #include <linux/slab.h>
  20 #include <linux/kmod.h>
  21 #include <linux/ctype.h>
  22 #include <linux/genhd.h>
  23 #include <linux/blktrace_api.h>
  24
  25 #include "check.h"
  26
  27 #include "acorn.h"
  28 #include "amiga.h"
  29 #include "atari.h"
  30 #include "ldm.h"
  31 #include "mac.h"
  32 #include "msdos.h"
  33 #include "osf.h"
  34 #include "sgi.h"
  35 #include "sun.h"
  36 #include "ibm.h"
  37 #include "ultrix.h"
  38 #include "efi.h"
  39 #include "karma.h"
  40 #include "sysv68.h"
  41 #include "cmdline.h"
  42
  43 #ifdef CONFIG_BLK_DEV_MD
  44 extern void md_autodetect_dev(dev_t dev);
  45 #endif
  46
  47 int warn_no_part = 1; /*This is ugly: should make genhd removable media aware*/
  48
  49 static int (*check_part[])(struct parsed_partitions *) = {
  50 #ifdef CONFIG_CMDLINE_PARTITION
  51         cmdline_partition,
  52 #endif
  53         /*
  54          * Probe partition formats with tables at disk address 0
  55          * that also have an ADFS boot block at 0xdc0.
  56          */
  57 #ifdef CONFIG_ACORN_PARTITION_ICS
  58         adfspart_check_ICS,
  59 #endif
  60 #ifdef CONFIG_ACORN_PARTITION_POWERTEC
  61         adfspart_check_POWERTEC,
  62 #endif
  63 #ifdef CONFIG_ACORN_PARTITION_EESOX
  64         adfspart_check_EESOX,
  65 #endif
  66
  67         /*
  68          * Now move on to formats that only have partition info at
  69          * disk address 0xdc0.  Since these may also have stale
  70          * PC/BIOS partition tables, they need to come before
  71          * the msdos entry.
  72          */
  73 #ifdef CONFIG_ACORN_PARTITION_CUMANA
  74         adfspart_check_CUMANA,
  75 #endif
  76 #ifdef CONFIG_ACORN_PARTITION_ADFS
  77         adfspart_check_ADFS,
  78 #endif
  79
  80 #ifdef CONFIG_EFI_PARTITION
  81         efi_partition,          /* this must come before msdos */
  82 #endif
  83 #ifdef CONFIG_SGI_PARTITION
  84         sgi_partition,
  85 #endif
  86 #ifdef CONFIG_LDM_PARTITION
  87         ldm_partition,          /* this must come before msdos */
  88 #endif
  89 #ifdef CONFIG_MSDOS_PARTITION
  90         msdos_partition,
  91 #endif
  92 #ifdef CONFIG_OSF_PARTITION
  93         osf_partition,
  94 #endif
  95 #ifdef CONFIG_SUN_PARTITION
  96         sun_partition,
  97 #endif
  98 #ifdef CONFIG_AMIGA_PARTITION
  99         amiga_partition,
 100 #endif
 101 #ifdef CONFIG_ATARI_PARTITION
 102         atari_partition,
 103 #endif
 104 #ifdef CONFIG_MAC_PARTITION
 105         mac_partition,
 106 #endif
 107 #ifdef CONFIG_ULTRIX_PARTITION
 108         ultrix_partition,
 109 #endif
 110 #ifdef CONFIG_IBM_PARTITION
 111         ibm_partition,
 112 #endif
 113 #ifdef CONFIG_KARMA_PARTITION
 114         karma_partition,
 115 #endif
 116 #ifdef CONFIG_SYSV68_PARTITION
 117         sysv68_partition,
 118 #endif
 119         NULL
 120 };
 121
 122 /*
 123  * disk_name() is used by partition check code and the genhd driver.
 124  * It formats the devicename of the indicated disk into
 125  * the supplied buffer (of size at least 32), and returns
 126  * a pointer to that same buffer (for convenience).
 127  */
 128
 129 char *disk_name(struct gendisk *hd, int partno, char *buf)
 130 {
 131         if (!partno)
 132                 snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name);
 133         else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1]))
 134                 snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, partno);
 135         else
 136                 snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, partno);
 137
 138         return buf;
 139 }
 140
 141 const char *bdevname(struct block_device *bdev, char *buf)
 142 {
 143         return disk_name(bdev->bd_disk, bdev->bd_part->partno, buf);
 144 }
 145
 146 EXPORT_SYMBOL(bdevname);
 147
 148 /*
 149  * There's very little reason to use this, you should really
 150  * have a struct block_device just about everywhere and use
 151  * bdevname() instead.
 152  */
 153 const char *__bdevname(dev_t dev, char *buffer)
 154 {
 155         scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)",
 156                                 MAJOR(dev), MINOR(dev));
 157         return buffer;
 158 }
 159
 160 EXPORT_SYMBOL(__bdevname);
 161
 162 static struct parsed_partitions *
 163 check_partition(struct gendisk *hd, struct block_device *bdev)
 164 {
 165         struct parsed_partitions *state;
 166         int i, res, err;
 167
 168         state = kzalloc(sizeof(struct parsed_partitions), GFP_KERNEL);
 169         if (!state)
 170                 return NULL;
 171         state->pp_buf = (char *)__get_free_page(GFP_KERNEL);
 172         if (!state->pp_buf) {
 173                 kfree(state);
 174                 return NULL;
 175         }
 176         state->pp_buf[0] = '\0';
 177
 178         state->bdev = bdev;
 179         disk_name(hd, 0, state->name);
 180         snprintf(state->pp_buf, PAGE_SIZE, " %s:", state->name);
 181         if (isdigit(state->name[strlen(state->name)-1]))
 182                 sprintf(state->name, "p");
 183
 184         state->limit = disk_max_parts(hd);
 185         i = res = err = 0;
 186         while (!res && check_part[i]) {
 187                 memset(&state->parts, 0, sizeof(state->parts));
 188                 res = check_part[i++](state);
 189                 if (res < 0) {
 190                         /* We have hit an I/O error which we don't report now.
 191                         * But record it, and let the others do their job.
 192                         */
 193                         err = res;
 194                         res = 0;
 195                 }
 196
 197         }
 198         if (res > 0) {
 199                 printk(KERN_INFO "%s", state->pp_buf);
 200
 201                 free_page((unsigned long)state->pp_buf);
 202                 return state;
 203         }
 204         if (state->access_beyond_eod)
 205                 err = -ENOSPC;
 206         if (err)
 207         /* The partition is unrecognized. So report I/O errors if there were any */
 208                 res = err;
 209         if (!res)
 210                 strlcat(state->pp_buf, " unknown partition table\n", PAGE_SIZE);
 211         else if (warn_no_part)
 212                 strlcat(state->pp_buf, " unable to read partition table\n", PAGE_SIZE);
 213
 214         printk(KERN_INFO "%s", state->pp_buf);
 215
 216         free_page((unsigned long)state->pp_buf);
 217         kfree(state);
 218         return ERR_PTR(res);
 219 }
 220
 221 static ssize_t part_partition_show(struct device *dev,
 222                                    struct device_attribute *attr, char *buf)
 223 {
 224         struct hd_struct *p = dev_to_part(dev);
 225
 226         return sprintf(buf, "%d\n", p->partno);
 227 }
 228
 229 static ssize_t part_start_show(struct device *dev,
 230                                struct device_attribute *attr, char *buf)
 231 {
 232         struct hd_struct *p = dev_to_part(dev);
 233
 234         return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect);
 235 }
 236
 237 ssize_t part_size_show(struct device *dev,
 238                        struct device_attribute *attr, char *buf)
 239 {
 240         struct hd_struct *p = dev_to_part(dev);
 241         return sprintf(buf, "%llu\n",(unsigned long long)p->nr_sects);
 242 }
 243
 244 ssize_t part_alignment_offset_show(struct device *dev,
 245                                    struct device_attribute *attr, char *buf)
 246 {
 247         struct hd_struct *p = dev_to_part(dev);
 248         return sprintf(buf, "%llu\n", (unsigned long long)p->alignment_offset);
 249 }
 250
 251 ssize_t part_discard_alignment_show(struct device *dev,
 252                                    struct device_attribute *attr, char *buf)
 253 {
 254         struct hd_struct *p = dev_to_part(dev);
 255         return sprintf(buf, "%u\n", p->discard_alignment);
 256 }
 257
 258 ssize_t part_stat_show(struct device *dev,
 259                        struct device_attribute *attr, char *buf)
 260 {
 261         struct hd_struct *p = dev_to_part(dev);
 262         int cpu;
 263
 264         cpu = part_stat_lock();
 265         part_round_stats(cpu, p);
 266         part_stat_unlock();
 267         return sprintf(buf,
 268                 "%8lu %8lu %8llu %8u "
 269                 "%8lu %8lu %8llu %8u "
 270                 "%8u %8u %8u"
 271                 "\n",
 272                 part_stat_read(p, ios[READ]),
 273                 part_stat_read(p, merges[READ]),
 274                 (unsigned long long)part_stat_read(p, sectors[READ]),
 275                 jiffies_to_msecs(part_stat_read(p, ticks[READ])),
 276                 part_stat_read(p, ios[WRITE]),
 277                 part_stat_read(p, merges[WRITE]),
 278                 (unsigned long long)part_stat_read(p, sectors[WRITE]),
 279                 jiffies_to_msecs(part_stat_read(p, ticks[WRITE])),
 280                 part_in_flight(p),
 281                 jiffies_to_msecs(part_stat_read(p, io_ticks)),
 282                 jiffies_to_msecs(part_stat_read(p, time_in_queue)));
 283 }
 284
 285 ssize_t part_inflight_show(struct device *dev,
 286                         struct device_attribute *attr, char *buf)
 287 {
 288         struct hd_struct *p = dev_to_part(dev);
 289
 290         return sprintf(buf, "%8u %8u\n", p->in_flight[0], p->in_flight[1]);
 291 }
 292
 293 ssize_t part_partition_name_show(struct device *dev,
 294                         struct device_attribute *attr, char *buf)
 295 {
 296         struct hd_struct *p = dev_to_part(dev);
 297         return sprintf(buf, "%s\n", p->partition_name);
 298 }
 299
 300 #ifdef CONFIG_FAIL_MAKE_REQUEST
 301 ssize_t part_fail_show(struct device *dev,
 302                        struct device_attribute *attr, char *buf)
 303 {
 304         struct hd_struct *p = dev_to_part(dev);
 305
 306         return sprintf(buf, "%d\n", p->make_it_fail);
 307 }
 308
 309 ssize_t part_fail_store(struct device *dev,
 310                         struct device_attribute *attr,
 311                         const char *buf, size_t count)
 312 {
 313         struct hd_struct *p = dev_to_part(dev);
 314         int i;
 315
 316         if (count > 0 && sscanf(buf, "%d", &i) > 0)
 317                 p->make_it_fail = (i == 0) ? 0 : 1;
 318
 319         return count;
 320 }
 321 #endif
 322
 323 static DEVICE_ATTR(partition, S_IRUGO, part_partition_show, NULL);
 324 static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL);
 325 static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);
 326 static DEVICE_ATTR(alignment_offset, S_IRUGO, part_alignment_offset_show, NULL);
 327 static DEVICE_ATTR(discard_alignment, S_IRUGO, part_discard_alignment_show,
 328                    NULL);
 329 static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
 330 static DEVICE_ATTR(inflight, S_IRUGO, part_inflight_show, NULL);
 331 static DEVICE_ATTR(partition_name, S_IRUGO, part_partition_name_show, NULL);
 332
 333 #ifdef CONFIG_FAIL_MAKE_REQUEST
 334 static struct device_attribute dev_attr_fail =
 335         __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store);
 336 #endif
 337
 338 static struct attribute *part_attrs[] = {
 339         &dev_attr_partition.attr,
 340         &dev_attr_start.attr,
 341         &dev_attr_size.attr,
 342         &dev_attr_alignment_offset.attr,
 343         &dev_attr_discard_alignment.attr,
 344         &dev_attr_stat.attr,
 345         &dev_attr_inflight.attr,
 346         &dev_attr_partition_name.attr,
 347 #ifdef CONFIG_FAIL_MAKE_REQUEST
 348         &dev_attr_fail.attr,
 349 #endif
 350         NULL
 351 };
 352
 353 static struct attribute_group part_attr_group = {
 354         .attrs = part_attrs,
 355 };
 356
 357 static const struct attribute_group *part_attr_groups[] = {
 358         &part_attr_group,
 359 #ifdef CONFIG_BLK_DEV_IO_TRACE
 360         &blk_trace_attr_group,
 361 #endif
 362         NULL
 363 };
 364
 365 static void part_release(struct device *dev)
 366 {
 367         struct hd_struct *p = dev_to_part(dev);
 368         free_part_stats(p);
 369         kfree(p);
 370 }
 371
 372 static int part_uevent(struct device *dev, struct kobj_uevent_env *env)
 373 {
 374         struct hd_struct *part = dev_to_part(dev);
 375
 376         add_uevent_var(env, "PARTN=%u", part->partno);
 377         if (part->partition_name)
 378                 add_uevent_var(env, "PARTNAME=%s", part->partition_name);
 379         return 0;
 380 }
 381
 382 struct device_type part_type = {
 383         .name           = "partition",
 384         .groups         = part_attr_groups,
 385         .release        = part_release,
 386         .uevent         = part_uevent,
 387 };
 388
 389 static void delete_partition_rcu_cb(struct rcu_head *head)
 390 {
 391         struct hd_struct *part = container_of(head, struct hd_struct, rcu_head);
 392
 393         part->start_sect = 0;
 394         part->nr_sects = 0;
 395         part_stat_set_all(part, 0);
 396         put_device(part_to_dev(part));
 397 }
 398
 399 void delete_partition(struct gendisk *disk, int partno)
 400 {
 401         struct disk_part_tbl *ptbl = disk->part_tbl;
 402         struct hd_struct *part;
 403
 404         if (partno >= ptbl->len)
 405                 return;
 406
 407         part = ptbl->part[partno];
 408         if (!part)
 409                 return;
 410
 411         blk_free_devt(part_devt(part));
 412         rcu_assign_pointer(ptbl->part[partno], NULL);
 413         rcu_assign_pointer(ptbl->last_lookup, NULL);
 414         kobject_put(part->holder_dir);
 415         device_del(part_to_dev(part));
 416
 417         call_rcu(&part->rcu_head, delete_partition_rcu_cb);
 418 }
 419
 420 static ssize_t whole_disk_show(struct device *dev,
 421                                struct device_attribute *attr, char *buf)
 422 {
 423         return 0;
 424 }
 425 static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH,
 426                    whole_disk_show, NULL);
 427
 428 static void name_partition(struct hd_struct *p, const char *name)
 429 {
 430         strlcpy(p->partition_name, name, GENHD_PART_NAME_SIZE);
 431 }
 432
 433 struct hd_struct *add_partition(struct gendisk *disk, int partno,
 434                                 sector_t start, sector_t len, int flags)
 435 {
 436         struct hd_struct *p;
 437         dev_t devt = MKDEV(0, 0);
 438         struct device *ddev = disk_to_dev(disk);
 439         struct device *pdev;
 440         struct disk_part_tbl *ptbl;
 441         const char *dname;
 442         int err;
 443
 444         err = disk_expand_part_tbl(disk, partno);
 445         if (err)
 446                 return ERR_PTR(err);
 447         ptbl = disk->part_tbl;
 448
 449         if (ptbl->part[partno])
 450                 return ERR_PTR(-EBUSY);
 451
 452         p = kzalloc(sizeof(*p), GFP_KERNEL);
 453         if (!p)
 454                 return ERR_PTR(-EBUSY);
 455
 456         if (!init_part_stats(p)) {
 457                 err = -ENOMEM;
 458                 goto out_free;
 459         }
 460         pdev = part_to_dev(p);
 461
 462         p->start_sect = start;
 463         p->alignment_offset =
 464                 queue_limit_alignment_offset(&disk->queue->limits, start);
 465         p->discard_alignment =
 466                 queue_limit_discard_alignment(&disk->queue->limits, start);
 467         p->nr_sects = len;
 468         p->partno = partno;
 469         p->policy = get_disk_ro(disk);
 470
 471         dname = dev_name(ddev);
 472         if (isdigit(dname[strlen(dname) - 1]))
 473                 dev_set_name(pdev, "%sp%d", dname, partno);
 474         else
 475                 dev_set_name(pdev, "%s%d", dname, partno);
 476
 477         device_initialize(pdev);
 478         pdev->class = &block_class;
 479         pdev->type = &part_type;
 480         pdev->parent = ddev;
 481
 482         err = blk_alloc_devt(p, &devt);
 483         if (err)
 484                 goto out_free_stats;
 485         pdev->devt = devt;
 486
 487         /* delay uevent until 'holders' subdir is created */
 488         dev_set_uevent_suppress(pdev, 1);
 489         err = device_add(pdev);
 490         if (err)
 491                 goto out_put;
 492
 493         err = -ENOMEM;
 494         p->holder_dir = kobject_create_and_add("holders", &pdev->kobj);
 495         if (!p->holder_dir)
 496                 goto out_del;
 497
 498         dev_set_uevent_suppress(pdev, 0);
 499         if (flags & ADDPART_FLAG_WHOLEDISK) {
 500                 err = device_create_file(pdev, &dev_attr_whole_disk);
 501                 if (err)
 502                         goto out_del;
 503         }
 504
 505         /* everything is up and running, commence */
 506         rcu_assign_pointer(ptbl->part[partno], p);
 507
 508         /* suppress uevent if the disk supresses it */
 509         if (!dev_get_uevent_suppress(ddev))
 510                 kobject_uevent(&pdev->kobj, KOBJ_ADD);
 511
 512         return p;
 513
 514 out_free_stats:
 515         free_part_stats(p);
 516 out_free:
 517         kfree(p);
 518         return ERR_PTR(err);
 519 out_del:
 520         kobject_put(p->holder_dir);
 521         device_del(pdev);
 522 out_put:
 523         put_device(pdev);
 524         blk_free_devt(devt);
 525         return ERR_PTR(err);
 526 }
 527
 528 /* Not exported, helper to add_disk(). */
 529 void register_disk(struct gendisk *disk)
 530 {
 531         struct device *ddev = disk_to_dev(disk);
 532         struct block_device *bdev;
 533         struct disk_part_iter piter;
 534         struct hd_struct *part;
 535         int err;
 536
 537         ddev->parent = disk->driverfs_dev;
 538
 539         dev_set_name(ddev, disk->disk_name);
 540
 541         /* delay uevents, until we scanned partition table */
 542         dev_set_uevent_suppress(ddev, 1);
 543
 544         if (device_add(ddev))
 545                 return;
 546 #ifndef CONFIG_SYSFS_DEPRECATED
 547         err = sysfs_create_link(block_depr, &ddev->kobj,
 548                                 kobject_name(&ddev->kobj));
 549         if (err) {
 550                 device_del(ddev);
 551                 return;
 552         }
 553 #endif
 554         disk->part0.holder_dir = kobject_create_and_add("holders", &ddev->kobj);
 555         disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj);
 556
 557         /* No minors to use for partitions */
 558         if (!disk_partitionable(disk))
 559                 goto exit;
 560
 561         /* No such device (e.g., media were just removed) */
 562         if (!get_capacity(disk))
 563                 goto exit;
 564
 565         bdev = bdget_disk(disk, 0);
 566         if (!bdev)
 567                 goto exit;
 568
 569         bdev->bd_invalidated = 1;
 570         err = blkdev_get(bdev, FMODE_READ);
 571         if (err < 0)
 572                 goto exit;
 573         blkdev_put(bdev, FMODE_READ);
 574
 575 exit:
 576         /* announce disk after possible partitions are created */
 577         dev_set_uevent_suppress(ddev, 0);
 578         kobject_uevent(&ddev->kobj, KOBJ_ADD);
 579
 580         /* announce possible partitions */
 581         disk_part_iter_init(&piter, disk, 0);
 582         while ((part = disk_part_iter_next(&piter)))
 583                 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD);
 584         disk_part_iter_exit(&piter);
 585 }
 586
 587 static bool disk_unlock_native_capacity(struct gendisk *disk)
 588 {
 589         const struct block_device_operations *bdops = disk->fops;
 590
 591         if (bdops->unlock_native_capacity &&
 592             !(disk->flags & GENHD_FL_NATIVE_CAPACITY)) {
 593                 printk(KERN_CONT "enabling native capacity\n");
 594                 bdops->unlock_native_capacity(disk);
 595                 disk->flags |= GENHD_FL_NATIVE_CAPACITY;
 596                 return true;
 597         } else {
 598                 printk(KERN_CONT "truncated\n");
 599                 return false;
 600         }
 601 }
 602
 603 int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
 604 {
 605         struct parsed_partitions *state = NULL;
 606         struct disk_part_iter piter;
 607         struct hd_struct *part;
 608         int p, highest, res;
 609 rescan:
 610         if (state && !IS_ERR(state)) {
 611                 kfree(state);
 612                 state = NULL;
 613         }
 614
 615         if (bdev->bd_part_count)
 616                 return -EBUSY;
 617         res = invalidate_partition(disk, 0);
 618         if (res)
 619                 return res;
 620
 621         disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
 622         while ((part = disk_part_iter_next(&piter)))
 623                 delete_partition(disk, part->partno);
 624         disk_part_iter_exit(&piter);
 625
 626         if (disk->fops->revalidate_disk)
 627                 disk->fops->revalidate_disk(disk);
 628         check_disk_size_change(disk, bdev);
 629         bdev->bd_invalidated = 0;
 630         if (!get_capacity(disk) || !(state = check_partition(disk, bdev)))
 631                 return 0;
 632         if (IS_ERR(state)) {
 633                 /*
 634                  * I/O error reading the partition table.  If any
 635                  * partition code tried to read beyond EOD, retry
 636                  * after unlocking native capacity.
 637                  */
 638                 if (PTR_ERR(state) == -ENOSPC) {
 639                         printk(KERN_WARNING "%s: partition table beyond EOD, ",
 640                                disk->disk_name);
 641                         if (disk_unlock_native_capacity(disk))
 642                                 goto rescan;
 643                 }
 644                 return -EIO;
 645         }
 646         /*
 647          * If any partition code tried to read beyond EOD, try
 648          * unlocking native capacity even if partition table is
 649          * sucessfully read as we could be missing some partitions.
 650          */
 651         if (state->access_beyond_eod) {
 652                 printk(KERN_WARNING
 653                        "%s: partition table partially beyond EOD, ",
 654                        disk->disk_name);
 655                 if (disk_unlock_native_capacity(disk))
 656                         goto rescan;
 657         }
 658
 659         /* tell userspace that the media / partition table may have changed */
 660         kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
 661
 662         /* Detect the highest partition number and preallocate
 663          * disk->part_tbl.  This is an optimization and not strictly
 664          * necessary.
 665          */
 666         for (p = 1, highest = 0; p < state->limit; p++)
 667                 if (state->parts[p].size)
 668                         highest = p;
 669
 670         disk_expand_part_tbl(disk, highest);
 671
 672         /* add partitions */
 673         for (p = 1; p < state->limit; p++) {
 674                 sector_t size, from;
 675
 676                 size = state->parts[p].size;
 677                 if (!size)
 678                         continue;
 679
 680                 from = state->parts[p].from;
 681                 if (from >= get_capacity(disk)) {
 682                         printk(KERN_WARNING
 683                                "%s: p%d start %llu is beyond EOD, ",
 684                                disk->disk_name, p, (unsigned long long) from);
 685                         if (disk_unlock_native_capacity(disk))
 686                                 goto rescan;
 687                         continue;
 688                 }
 689
 690                 if (from + size > get_capacity(disk)) {
 691                         printk(KERN_WARNING
 692                                "%s: p%d size %llu extends beyond EOD, ",
 693                                disk->disk_name, p, (unsigned long long) size);
 694
 695                         if (disk_unlock_native_capacity(disk)) {
 696                                 /* free state and restart */
 697                                 goto rescan;
 698                         } else {
 699                                 /*
 700                                  * we can not ignore partitions of broken tables
 701                                  * created by for example camera firmware, but
 702                                  * we limit them to the end of the disk to avoid
 703                                  * creating invalid block devices
 704                                  */
 705                                 size = get_capacity(disk) - from;
 706                         }
 707                 }
 708                 part = add_partition(disk, p, from, size,
 709                                      state->parts[p].flags);
 710                 if (IS_ERR(part)) {
 711                         printk(KERN_ERR " %s: p%d could not be added: %ld\n",
 712                                disk->disk_name, p, -PTR_ERR(part));
 713                         continue;
 714                 }
 715                 name_partition(part, state->parts[p].name);
 716 #ifdef CONFIG_BLK_DEV_MD
 717                 if (state->parts[p].flags & ADDPART_FLAG_RAID)
 718                         md_autodetect_dev(part_to_dev(part)->devt);
 719 #endif
 720         }
 721         kfree(state);
 722         return 0;
 723 }
 724
 725 unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
 726 {
 727         struct address_space *mapping = bdev->bd_inode->i_mapping;
 728         struct page *page;
 729
 730         page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)),
 731                                  NULL);
 732         if (!IS_ERR(page)) {
 733                 if (PageError(page))
 734                         goto fail;
 735                 p->v = page;
 736                 return (unsigned char *)page_address(page) +  ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9);
 737 fail:
 738                 page_cache_release(page);
 739         }
 740         p->v = NULL;
 741         return NULL;
 742 }
 743
 744 EXPORT_SYMBOL(read_dev_sector);
 745
 746 void del_gendisk(struct gendisk *disk)
 747 {
 748         struct disk_part_iter piter;
 749         struct hd_struct *part;
 750
 751         /* invalidate stuff */
 752         disk_part_iter_init(&piter, disk,
 753                              DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE);
 754         while ((part = disk_part_iter_next(&piter))) {
 755                 invalidate_partition(disk, part->partno);
 756                 delete_partition(disk, part->partno);
 757         }
 758         disk_part_iter_exit(&piter);
 759
 760         invalidate_partition(disk, 0);
 761         blk_free_devt(disk_to_dev(disk)->devt);
 762         set_capacity(disk, 0);
 763         disk->flags &= ~GENHD_FL_UP;
 764         unlink_gendisk(disk);
 765         part_stat_set_all(&disk->part0, 0);
 766         disk->part0.stamp = 0;
 767
 768         kobject_put(disk->part0.holder_dir);
 769         kobject_put(disk->slave_dir);
 770         disk->driverfs_dev = NULL;
 771 #ifndef CONFIG_SYSFS_DEPRECATED
 772         sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk)));
 773 #endif
 774         device_del(disk_to_dev(disk));
 775 }