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