| 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 *) = { |
| 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 | state->bdev = bdev; |
| 169 | disk_name(hd, 0, state->name); |
| 170 | printk(KERN_INFO " %s:", state->name); |
| 171 | if (isdigit(state->name[strlen(state->name)-1])) |
| 172 | sprintf(state->name, "p"); |
| 173 | |
| 174 | state->limit = disk_max_parts(hd); |
| 175 | i = res = err = 0; |
| 176 | while (!res && check_part[i]) { |
| 177 | memset(&state->parts, 0, sizeof(state->parts)); |
| 178 | res = check_part[i++](state); |
| 179 | if (res < 0) { |
| 180 | /* We have hit an I/O error which we don't report now. |
| 181 | * But record it, and let the others do their job. |
| 182 | */ |
| 183 | err = res; |
| 184 | res = 0; |
| 185 | } |
| 186 | |
| 187 | } |
| 188 | if (res > 0) |
| 189 | return state; |
| 190 | if (err) |
| 191 | /* The partition is unrecognized. So report I/O errors if there were any */ |
| 192 | res = err; |
| 193 | if (!res) |
| 194 | printk(" unknown partition table\n"); |
| 195 | else if (warn_no_part) |
| 196 | printk(" unable to read partition table\n"); |
| 197 | kfree(state); |
| 198 | return ERR_PTR(res); |
| 199 | } |
| 200 | |
| 201 | static ssize_t part_partition_show(struct device *dev, |
| 202 | struct device_attribute *attr, char *buf) |
| 203 | { |
| 204 | struct hd_struct *p = dev_to_part(dev); |
| 205 | |
| 206 | return sprintf(buf, "%d\n", p->partno); |
| 207 | } |
| 208 | |
| 209 | static ssize_t part_start_show(struct device *dev, |
| 210 | struct device_attribute *attr, char *buf) |
| 211 | { |
| 212 | struct hd_struct *p = dev_to_part(dev); |
| 213 | |
| 214 | return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect); |
| 215 | } |
| 216 | |
| 217 | ssize_t part_size_show(struct device *dev, |
| 218 | struct device_attribute *attr, char *buf) |
| 219 | { |
| 220 | struct hd_struct *p = dev_to_part(dev); |
| 221 | return sprintf(buf, "%llu\n",(unsigned long long)p->nr_sects); |
| 222 | } |
| 223 | |
| 224 | ssize_t part_alignment_offset_show(struct device *dev, |
| 225 | struct device_attribute *attr, char *buf) |
| 226 | { |
| 227 | struct hd_struct *p = dev_to_part(dev); |
| 228 | return sprintf(buf, "%llu\n", (unsigned long long)p->alignment_offset); |
| 229 | } |
| 230 | |
| 231 | ssize_t part_discard_alignment_show(struct device *dev, |
| 232 | struct device_attribute *attr, char *buf) |
| 233 | { |
| 234 | struct hd_struct *p = dev_to_part(dev); |
| 235 | return sprintf(buf, "%u\n", p->discard_alignment); |
| 236 | } |
| 237 | |
| 238 | ssize_t part_stat_show(struct device *dev, |
| 239 | struct device_attribute *attr, char *buf) |
| 240 | { |
| 241 | struct hd_struct *p = dev_to_part(dev); |
| 242 | int cpu; |
| 243 | |
| 244 | cpu = part_stat_lock(); |
| 245 | part_round_stats(cpu, p); |
| 246 | part_stat_unlock(); |
| 247 | return sprintf(buf, |
| 248 | "%8lu %8lu %8llu %8u " |
| 249 | "%8lu %8lu %8llu %8u " |
| 250 | "%8u %8u %8u" |
| 251 | "\n", |
| 252 | part_stat_read(p, ios[READ]), |
| 253 | part_stat_read(p, merges[READ]), |
| 254 | (unsigned long long)part_stat_read(p, sectors[READ]), |
| 255 | jiffies_to_msecs(part_stat_read(p, ticks[READ])), |
| 256 | part_stat_read(p, ios[WRITE]), |
| 257 | part_stat_read(p, merges[WRITE]), |
| 258 | (unsigned long long)part_stat_read(p, sectors[WRITE]), |
| 259 | jiffies_to_msecs(part_stat_read(p, ticks[WRITE])), |
| 260 | part_in_flight(p), |
| 261 | jiffies_to_msecs(part_stat_read(p, io_ticks)), |
| 262 | jiffies_to_msecs(part_stat_read(p, time_in_queue))); |
| 263 | } |
| 264 | |
| 265 | ssize_t part_inflight_show(struct device *dev, |
| 266 | struct device_attribute *attr, char *buf) |
| 267 | { |
| 268 | struct hd_struct *p = dev_to_part(dev); |
| 269 | |
| 270 | return sprintf(buf, "%8u %8u\n", p->in_flight[0], p->in_flight[1]); |
| 271 | } |
| 272 | |
| 273 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
| 274 | ssize_t part_fail_show(struct device *dev, |
| 275 | struct device_attribute *attr, char *buf) |
| 276 | { |
| 277 | struct hd_struct *p = dev_to_part(dev); |
| 278 | |
| 279 | return sprintf(buf, "%d\n", p->make_it_fail); |
| 280 | } |
| 281 | |
| 282 | ssize_t part_fail_store(struct device *dev, |
| 283 | struct device_attribute *attr, |
| 284 | const char *buf, size_t count) |
| 285 | { |
| 286 | struct hd_struct *p = dev_to_part(dev); |
| 287 | int i; |
| 288 | |
| 289 | if (count > 0 && sscanf(buf, "%d", &i) > 0) |
| 290 | p->make_it_fail = (i == 0) ? 0 : 1; |
| 291 | |
| 292 | return count; |
| 293 | } |
| 294 | #endif |
| 295 | |
| 296 | static DEVICE_ATTR(partition, S_IRUGO, part_partition_show, NULL); |
| 297 | static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL); |
| 298 | static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL); |
| 299 | static DEVICE_ATTR(alignment_offset, S_IRUGO, part_alignment_offset_show, NULL); |
| 300 | static DEVICE_ATTR(discard_alignment, S_IRUGO, part_discard_alignment_show, |
| 301 | NULL); |
| 302 | static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL); |
| 303 | static DEVICE_ATTR(inflight, S_IRUGO, part_inflight_show, NULL); |
| 304 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
| 305 | static struct device_attribute dev_attr_fail = |
| 306 | __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store); |
| 307 | #endif |
| 308 | |
| 309 | static struct attribute *part_attrs[] = { |
| 310 | &dev_attr_partition.attr, |
| 311 | &dev_attr_start.attr, |
| 312 | &dev_attr_size.attr, |
| 313 | &dev_attr_alignment_offset.attr, |
| 314 | &dev_attr_discard_alignment.attr, |
| 315 | &dev_attr_stat.attr, |
| 316 | &dev_attr_inflight.attr, |
| 317 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
| 318 | &dev_attr_fail.attr, |
| 319 | #endif |
| 320 | NULL |
| 321 | }; |
| 322 | |
| 323 | static struct attribute_group part_attr_group = { |
| 324 | .attrs = part_attrs, |
| 325 | }; |
| 326 | |
| 327 | static const struct attribute_group *part_attr_groups[] = { |
| 328 | &part_attr_group, |
| 329 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
| 330 | &blk_trace_attr_group, |
| 331 | #endif |
| 332 | NULL |
| 333 | }; |
| 334 | |
| 335 | static void part_release(struct device *dev) |
| 336 | { |
| 337 | struct hd_struct *p = dev_to_part(dev); |
| 338 | free_part_stats(p); |
| 339 | kfree(p); |
| 340 | } |
| 341 | |
| 342 | struct device_type part_type = { |
| 343 | .name = "partition", |
| 344 | .groups = part_attr_groups, |
| 345 | .release = part_release, |
| 346 | }; |
| 347 | |
| 348 | static void delete_partition_rcu_cb(struct rcu_head *head) |
| 349 | { |
| 350 | struct hd_struct *part = container_of(head, struct hd_struct, rcu_head); |
| 351 | |
| 352 | part->start_sect = 0; |
| 353 | part->nr_sects = 0; |
| 354 | part_stat_set_all(part, 0); |
| 355 | put_device(part_to_dev(part)); |
| 356 | } |
| 357 | |
| 358 | void delete_partition(struct gendisk *disk, int partno) |
| 359 | { |
| 360 | struct disk_part_tbl *ptbl = disk->part_tbl; |
| 361 | struct hd_struct *part; |
| 362 | |
| 363 | if (partno >= ptbl->len) |
| 364 | return; |
| 365 | |
| 366 | part = ptbl->part[partno]; |
| 367 | if (!part) |
| 368 | return; |
| 369 | |
| 370 | blk_free_devt(part_devt(part)); |
| 371 | rcu_assign_pointer(ptbl->part[partno], NULL); |
| 372 | rcu_assign_pointer(ptbl->last_lookup, NULL); |
| 373 | kobject_put(part->holder_dir); |
| 374 | device_del(part_to_dev(part)); |
| 375 | |
| 376 | call_rcu(&part->rcu_head, delete_partition_rcu_cb); |
| 377 | } |
| 378 | |
| 379 | static ssize_t whole_disk_show(struct device *dev, |
| 380 | struct device_attribute *attr, char *buf) |
| 381 | { |
| 382 | return 0; |
| 383 | } |
| 384 | static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH, |
| 385 | whole_disk_show, NULL); |
| 386 | |
| 387 | struct hd_struct *add_partition(struct gendisk *disk, int partno, |
| 388 | sector_t start, sector_t len, int flags) |
| 389 | { |
| 390 | struct hd_struct *p; |
| 391 | dev_t devt = MKDEV(0, 0); |
| 392 | struct device *ddev = disk_to_dev(disk); |
| 393 | struct device *pdev; |
| 394 | struct disk_part_tbl *ptbl; |
| 395 | const char *dname; |
| 396 | int err; |
| 397 | |
| 398 | err = disk_expand_part_tbl(disk, partno); |
| 399 | if (err) |
| 400 | return ERR_PTR(err); |
| 401 | ptbl = disk->part_tbl; |
| 402 | |
| 403 | if (ptbl->part[partno]) |
| 404 | return ERR_PTR(-EBUSY); |
| 405 | |
| 406 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
| 407 | if (!p) |
| 408 | return ERR_PTR(-EBUSY); |
| 409 | |
| 410 | if (!init_part_stats(p)) { |
| 411 | err = -ENOMEM; |
| 412 | goto out_free; |
| 413 | } |
| 414 | pdev = part_to_dev(p); |
| 415 | |
| 416 | p->start_sect = start; |
| 417 | p->alignment_offset = |
| 418 | queue_limit_alignment_offset(&disk->queue->limits, start); |
| 419 | p->discard_alignment = |
| 420 | queue_limit_discard_alignment(&disk->queue->limits, start); |
| 421 | p->nr_sects = len; |
| 422 | p->partno = partno; |
| 423 | p->policy = get_disk_ro(disk); |
| 424 | |
| 425 | dname = dev_name(ddev); |
| 426 | if (isdigit(dname[strlen(dname) - 1])) |
| 427 | dev_set_name(pdev, "%sp%d", dname, partno); |
| 428 | else |
| 429 | dev_set_name(pdev, "%s%d", dname, partno); |
| 430 | |
| 431 | device_initialize(pdev); |
| 432 | pdev->class = &block_class; |
| 433 | pdev->type = &part_type; |
| 434 | pdev->parent = ddev; |
| 435 | |
| 436 | err = blk_alloc_devt(p, &devt); |
| 437 | if (err) |
| 438 | goto out_free_stats; |
| 439 | pdev->devt = devt; |
| 440 | |
| 441 | /* delay uevent until 'holders' subdir is created */ |
| 442 | dev_set_uevent_suppress(pdev, 1); |
| 443 | err = device_add(pdev); |
| 444 | if (err) |
| 445 | goto out_put; |
| 446 | |
| 447 | err = -ENOMEM; |
| 448 | p->holder_dir = kobject_create_and_add("holders", &pdev->kobj); |
| 449 | if (!p->holder_dir) |
| 450 | goto out_del; |
| 451 | |
| 452 | dev_set_uevent_suppress(pdev, 0); |
| 453 | if (flags & ADDPART_FLAG_WHOLEDISK) { |
| 454 | err = device_create_file(pdev, &dev_attr_whole_disk); |
| 455 | if (err) |
| 456 | goto out_del; |
| 457 | } |
| 458 | |
| 459 | /* everything is up and running, commence */ |
| 460 | INIT_RCU_HEAD(&p->rcu_head); |
| 461 | rcu_assign_pointer(ptbl->part[partno], p); |
| 462 | |
| 463 | /* suppress uevent if the disk supresses it */ |
| 464 | if (!dev_get_uevent_suppress(ddev)) |
| 465 | kobject_uevent(&pdev->kobj, KOBJ_ADD); |
| 466 | |
| 467 | return p; |
| 468 | |
| 469 | out_free_stats: |
| 470 | free_part_stats(p); |
| 471 | out_free: |
| 472 | kfree(p); |
| 473 | return ERR_PTR(err); |
| 474 | out_del: |
| 475 | kobject_put(p->holder_dir); |
| 476 | device_del(pdev); |
| 477 | out_put: |
| 478 | put_device(pdev); |
| 479 | blk_free_devt(devt); |
| 480 | return ERR_PTR(err); |
| 481 | } |
| 482 | |
| 483 | /* Not exported, helper to add_disk(). */ |
| 484 | void register_disk(struct gendisk *disk) |
| 485 | { |
| 486 | struct device *ddev = disk_to_dev(disk); |
| 487 | struct block_device *bdev; |
| 488 | struct disk_part_iter piter; |
| 489 | struct hd_struct *part; |
| 490 | int err; |
| 491 | |
| 492 | ddev->parent = disk->driverfs_dev; |
| 493 | |
| 494 | dev_set_name(ddev, disk->disk_name); |
| 495 | |
| 496 | /* delay uevents, until we scanned partition table */ |
| 497 | dev_set_uevent_suppress(ddev, 1); |
| 498 | |
| 499 | if (device_add(ddev)) |
| 500 | return; |
| 501 | #ifndef CONFIG_SYSFS_DEPRECATED |
| 502 | err = sysfs_create_link(block_depr, &ddev->kobj, |
| 503 | kobject_name(&ddev->kobj)); |
| 504 | if (err) { |
| 505 | device_del(ddev); |
| 506 | return; |
| 507 | } |
| 508 | #endif |
| 509 | disk->part0.holder_dir = kobject_create_and_add("holders", &ddev->kobj); |
| 510 | disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj); |
| 511 | |
| 512 | /* No minors to use for partitions */ |
| 513 | if (!disk_partitionable(disk)) |
| 514 | goto exit; |
| 515 | |
| 516 | /* No such device (e.g., media were just removed) */ |
| 517 | if (!get_capacity(disk)) |
| 518 | goto exit; |
| 519 | |
| 520 | bdev = bdget_disk(disk, 0); |
| 521 | if (!bdev) |
| 522 | goto exit; |
| 523 | |
| 524 | bdev->bd_invalidated = 1; |
| 525 | err = blkdev_get(bdev, FMODE_READ); |
| 526 | if (err < 0) |
| 527 | goto exit; |
| 528 | blkdev_put(bdev, FMODE_READ); |
| 529 | |
| 530 | exit: |
| 531 | /* announce disk after possible partitions are created */ |
| 532 | dev_set_uevent_suppress(ddev, 0); |
| 533 | kobject_uevent(&ddev->kobj, KOBJ_ADD); |
| 534 | |
| 535 | /* announce possible partitions */ |
| 536 | disk_part_iter_init(&piter, disk, 0); |
| 537 | while ((part = disk_part_iter_next(&piter))) |
| 538 | kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD); |
| 539 | disk_part_iter_exit(&piter); |
| 540 | } |
| 541 | |
| 542 | int rescan_partitions(struct gendisk *disk, struct block_device *bdev) |
| 543 | { |
| 544 | struct disk_part_iter piter; |
| 545 | struct hd_struct *part; |
| 546 | struct parsed_partitions *state; |
| 547 | int p, highest, res; |
| 548 | rescan: |
| 549 | if (bdev->bd_part_count) |
| 550 | return -EBUSY; |
| 551 | res = invalidate_partition(disk, 0); |
| 552 | if (res) |
| 553 | return res; |
| 554 | |
| 555 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY); |
| 556 | while ((part = disk_part_iter_next(&piter))) |
| 557 | delete_partition(disk, part->partno); |
| 558 | disk_part_iter_exit(&piter); |
| 559 | |
| 560 | if (disk->fops->revalidate_disk) |
| 561 | disk->fops->revalidate_disk(disk); |
| 562 | check_disk_size_change(disk, bdev); |
| 563 | bdev->bd_invalidated = 0; |
| 564 | if (!get_capacity(disk) || !(state = check_partition(disk, bdev))) |
| 565 | return 0; |
| 566 | if (IS_ERR(state)) /* I/O error reading the partition table */ |
| 567 | return -EIO; |
| 568 | |
| 569 | /* tell userspace that the media / partition table may have changed */ |
| 570 | kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE); |
| 571 | |
| 572 | /* Detect the highest partition number and preallocate |
| 573 | * disk->part_tbl. This is an optimization and not strictly |
| 574 | * necessary. |
| 575 | */ |
| 576 | for (p = 1, highest = 0; p < state->limit; p++) |
| 577 | if (state->parts[p].size) |
| 578 | highest = p; |
| 579 | |
| 580 | disk_expand_part_tbl(disk, highest); |
| 581 | |
| 582 | /* add partitions */ |
| 583 | for (p = 1; p < state->limit; p++) { |
| 584 | sector_t size, from; |
| 585 | |
| 586 | size = state->parts[p].size; |
| 587 | if (!size) |
| 588 | continue; |
| 589 | |
| 590 | from = state->parts[p].from; |
| 591 | if (from >= get_capacity(disk)) { |
| 592 | printk(KERN_WARNING |
| 593 | "%s: p%d ignored, start %llu is behind the end of the disk\n", |
| 594 | disk->disk_name, p, (unsigned long long) from); |
| 595 | continue; |
| 596 | } |
| 597 | |
| 598 | if (from + size > get_capacity(disk)) { |
| 599 | const struct block_device_operations *bdops = disk->fops; |
| 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->unlock_native_capacity && |
| 606 | (disk->flags & GENHD_FL_NATIVE_CAPACITY) == 0) { |
| 607 | printk(KERN_CONT "enabling native capacity\n"); |
| 608 | bdops->unlock_native_capacity(disk); |
| 609 | disk->flags |= GENHD_FL_NATIVE_CAPACITY; |
| 610 | /* free state and restart */ |
| 611 | kfree(state); |
| 612 | goto rescan; |
| 613 | } else { |
| 614 | /* |
| 615 | * we can not ignore partitions of broken tables |
| 616 | * created by for example camera firmware, but |
| 617 | * we limit them to the end of the disk to avoid |
| 618 | * creating invalid block devices |
| 619 | */ |
| 620 | printk(KERN_CONT "limited to end of disk\n"); |
| 621 | size = get_capacity(disk) - from; |
| 622 | } |
| 623 | } |
| 624 | part = add_partition(disk, p, from, size, |
| 625 | state->parts[p].flags); |
| 626 | if (IS_ERR(part)) { |
| 627 | printk(KERN_ERR " %s: p%d could not be added: %ld\n", |
| 628 | disk->disk_name, p, -PTR_ERR(part)); |
| 629 | continue; |
| 630 | } |
| 631 | #ifdef CONFIG_BLK_DEV_MD |
| 632 | if (state->parts[p].flags & ADDPART_FLAG_RAID) |
| 633 | md_autodetect_dev(part_to_dev(part)->devt); |
| 634 | #endif |
| 635 | } |
| 636 | kfree(state); |
| 637 | return 0; |
| 638 | } |
| 639 | |
| 640 | unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p) |
| 641 | { |
| 642 | struct address_space *mapping = bdev->bd_inode->i_mapping; |
| 643 | struct page *page; |
| 644 | |
| 645 | page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)), |
| 646 | NULL); |
| 647 | if (!IS_ERR(page)) { |
| 648 | if (PageError(page)) |
| 649 | goto fail; |
| 650 | p->v = page; |
| 651 | return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9); |
| 652 | fail: |
| 653 | page_cache_release(page); |
| 654 | } |
| 655 | p->v = NULL; |
| 656 | return NULL; |
| 657 | } |
| 658 | |
| 659 | EXPORT_SYMBOL(read_dev_sector); |
| 660 | |
| 661 | void del_gendisk(struct gendisk *disk) |
| 662 | { |
| 663 | struct disk_part_iter piter; |
| 664 | struct hd_struct *part; |
| 665 | |
| 666 | /* invalidate stuff */ |
| 667 | disk_part_iter_init(&piter, disk, |
| 668 | DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE); |
| 669 | while ((part = disk_part_iter_next(&piter))) { |
| 670 | invalidate_partition(disk, part->partno); |
| 671 | delete_partition(disk, part->partno); |
| 672 | } |
| 673 | disk_part_iter_exit(&piter); |
| 674 | |
| 675 | invalidate_partition(disk, 0); |
| 676 | blk_free_devt(disk_to_dev(disk)->devt); |
| 677 | set_capacity(disk, 0); |
| 678 | disk->flags &= ~GENHD_FL_UP; |
| 679 | unlink_gendisk(disk); |
| 680 | part_stat_set_all(&disk->part0, 0); |
| 681 | disk->part0.stamp = 0; |
| 682 | |
| 683 | kobject_put(disk->part0.holder_dir); |
| 684 | kobject_put(disk->slave_dir); |
| 685 | disk->driverfs_dev = NULL; |
| 686 | #ifndef CONFIG_SYSFS_DEPRECATED |
| 687 | sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk))); |
| 688 | #endif |
| 689 | device_del(disk_to_dev(disk)); |
| 690 | } |