1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/capability.h> 3 #include <linux/compat.h> 4 #include <linux/blkdev.h> 5 #include <linux/export.h> 6 #include <linux/gfp.h> 7 #include <linux/blkpg.h> 8 #include <linux/hdreg.h> 9 #include <linux/backing-dev.h> 10 #include <linux/fs.h> 11 #include <linux/blktrace_api.h> 12 #include <linux/pr.h> 13 #include <linux/uaccess.h> 14 #include "blk.h" 15 16 static int blkpg_do_ioctl(struct block_device *bdev, 17 struct blkpg_partition __user *upart, int op) 18 { 19 struct block_device *bdevp; 20 struct gendisk *disk; 21 struct hd_struct *part, *lpart; 22 struct blkpg_partition p; 23 struct disk_part_iter piter; 24 long long start, length; 25 int partno; 26 27 if (!capable(CAP_SYS_ADMIN)) 28 return -EACCES; 29 if (copy_from_user(&p, upart, sizeof(struct blkpg_partition))) 30 return -EFAULT; 31 disk = bdev->bd_disk; 32 if (bdev != bdev->bd_contains) 33 return -EINVAL; 34 partno = p.pno; 35 if (partno <= 0) 36 return -EINVAL; 37 switch (op) { 38 case BLKPG_ADD_PARTITION: 39 start = p.start >> 9; 40 length = p.length >> 9; 41 /* check for fit in a hd_struct */ 42 if (sizeof(sector_t) == sizeof(long) && 43 sizeof(long long) > sizeof(long)) { 44 long pstart = start, plength = length; 45 if (pstart != start || plength != length 46 || pstart < 0 || plength < 0 || partno > 65535) 47 return -EINVAL; 48 } 49 /* check if partition is aligned to blocksize */ 50 if (p.start & (bdev_logical_block_size(bdev) - 1)) 51 return -EINVAL; 52 53 mutex_lock(&bdev->bd_mutex); 54 55 /* overlap? */ 56 disk_part_iter_init(&piter, disk, 57 DISK_PITER_INCL_EMPTY); 58 while ((part = disk_part_iter_next(&piter))) { 59 if (!(start + length <= part->start_sect || 60 start >= part->start_sect + part->nr_sects)) { 61 disk_part_iter_exit(&piter); 62 mutex_unlock(&bdev->bd_mutex); 63 return -EBUSY; 64 } 65 } 66 disk_part_iter_exit(&piter); 67 68 /* all seems OK */ 69 part = add_partition(disk, partno, start, length, 70 ADDPART_FLAG_NONE, NULL); 71 mutex_unlock(&bdev->bd_mutex); 72 return PTR_ERR_OR_ZERO(part); 73 case BLKPG_DEL_PARTITION: 74 part = disk_get_part(disk, partno); 75 if (!part) 76 return -ENXIO; 77 78 bdevp = bdget(part_devt(part)); 79 disk_put_part(part); 80 if (!bdevp) 81 return -ENOMEM; 82 83 mutex_lock(&bdevp->bd_mutex); 84 if (bdevp->bd_openers) { 85 mutex_unlock(&bdevp->bd_mutex); 86 bdput(bdevp); 87 return -EBUSY; 88 } 89 /* all seems OK */ 90 fsync_bdev(bdevp); 91 invalidate_bdev(bdevp); 92 93 mutex_lock_nested(&bdev->bd_mutex, 1); 94 delete_partition(disk, partno); 95 mutex_unlock(&bdev->bd_mutex); 96 mutex_unlock(&bdevp->bd_mutex); 97 bdput(bdevp); 98 99 return 0; 100 case BLKPG_RESIZE_PARTITION: 101 start = p.start >> 9; 102 /* new length of partition in bytes */ 103 length = p.length >> 9; 104 /* check for fit in a hd_struct */ 105 if (sizeof(sector_t) == sizeof(long) && 106 sizeof(long long) > sizeof(long)) { 107 long pstart = start, plength = length; 108 if (pstart != start || plength != length 109 || pstart < 0 || plength < 0) 110 return -EINVAL; 111 } 112 part = disk_get_part(disk, partno); 113 if (!part) 114 return -ENXIO; 115 bdevp = bdget(part_devt(part)); 116 if (!bdevp) { 117 disk_put_part(part); 118 return -ENOMEM; 119 } 120 mutex_lock(&bdevp->bd_mutex); 121 mutex_lock_nested(&bdev->bd_mutex, 1); 122 if (start != part->start_sect) { 123 mutex_unlock(&bdevp->bd_mutex); 124 mutex_unlock(&bdev->bd_mutex); 125 bdput(bdevp); 126 disk_put_part(part); 127 return -EINVAL; 128 } 129 /* overlap? */ 130 disk_part_iter_init(&piter, disk, 131 DISK_PITER_INCL_EMPTY); 132 while ((lpart = disk_part_iter_next(&piter))) { 133 if (lpart->partno != partno && 134 !(start + length <= lpart->start_sect || 135 start >= lpart->start_sect + lpart->nr_sects) 136 ) { 137 disk_part_iter_exit(&piter); 138 mutex_unlock(&bdevp->bd_mutex); 139 mutex_unlock(&bdev->bd_mutex); 140 bdput(bdevp); 141 disk_put_part(part); 142 return -EBUSY; 143 } 144 } 145 disk_part_iter_exit(&piter); 146 part_nr_sects_write(part, (sector_t)length); 147 i_size_write(bdevp->bd_inode, p.length); 148 mutex_unlock(&bdevp->bd_mutex); 149 mutex_unlock(&bdev->bd_mutex); 150 bdput(bdevp); 151 disk_put_part(part); 152 return 0; 153 default: 154 return -EINVAL; 155 } 156 } 157 158 static int blkpg_ioctl(struct block_device *bdev, 159 struct blkpg_ioctl_arg __user *arg) 160 { 161 struct blkpg_partition __user *udata; 162 int op; 163 164 if (get_user(op, &arg->op) || get_user(udata, &arg->data)) 165 return -EFAULT; 166 167 return blkpg_do_ioctl(bdev, udata, op); 168 } 169 170 #ifdef CONFIG_COMPAT 171 struct compat_blkpg_ioctl_arg { 172 compat_int_t op; 173 compat_int_t flags; 174 compat_int_t datalen; 175 compat_caddr_t data; 176 }; 177 178 static int compat_blkpg_ioctl(struct block_device *bdev, 179 struct compat_blkpg_ioctl_arg __user *arg) 180 { 181 compat_caddr_t udata; 182 int op; 183 184 if (get_user(op, &arg->op) || get_user(udata, &arg->data)) 185 return -EFAULT; 186 187 return blkpg_do_ioctl(bdev, compat_ptr(udata), op); 188 } 189 #endif 190 191 static int blkdev_reread_part(struct block_device *bdev) 192 { 193 int ret; 194 195 if (!disk_part_scan_enabled(bdev->bd_disk) || bdev != bdev->bd_contains) 196 return -EINVAL; 197 if (!capable(CAP_SYS_ADMIN)) 198 return -EACCES; 199 200 mutex_lock(&bdev->bd_mutex); 201 ret = bdev_disk_changed(bdev, false); 202 mutex_unlock(&bdev->bd_mutex); 203 204 return ret; 205 } 206 207 static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode, 208 unsigned long arg, unsigned long flags) 209 { 210 uint64_t range[2]; 211 uint64_t start, len; 212 struct request_queue *q = bdev_get_queue(bdev); 213 struct address_space *mapping = bdev->bd_inode->i_mapping; 214 215 216 if (!(mode & FMODE_WRITE)) 217 return -EBADF; 218 219 if (!blk_queue_discard(q)) 220 return -EOPNOTSUPP; 221 222 if (copy_from_user(range, (void __user *)arg, sizeof(range))) 223 return -EFAULT; 224 225 start = range[0]; 226 len = range[1]; 227 228 if (start & 511) 229 return -EINVAL; 230 if (len & 511) 231 return -EINVAL; 232 233 if (start + len > i_size_read(bdev->bd_inode)) 234 return -EINVAL; 235 truncate_inode_pages_range(mapping, start, start + len - 1); 236 return blkdev_issue_discard(bdev, start >> 9, len >> 9, 237 GFP_KERNEL, flags); 238 } 239 240 static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode, 241 unsigned long arg) 242 { 243 uint64_t range[2]; 244 struct address_space *mapping; 245 uint64_t start, end, len; 246 247 if (!(mode & FMODE_WRITE)) 248 return -EBADF; 249 250 if (copy_from_user(range, (void __user *)arg, sizeof(range))) 251 return -EFAULT; 252 253 start = range[0]; 254 len = range[1]; 255 end = start + len - 1; 256 257 if (start & 511) 258 return -EINVAL; 259 if (len & 511) 260 return -EINVAL; 261 if (end >= (uint64_t)i_size_read(bdev->bd_inode)) 262 return -EINVAL; 263 if (end < start) 264 return -EINVAL; 265 266 /* Invalidate the page cache, including dirty pages */ 267 mapping = bdev->bd_inode->i_mapping; 268 truncate_inode_pages_range(mapping, start, end); 269 270 return blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL, 271 BLKDEV_ZERO_NOUNMAP); 272 } 273 274 static int put_ushort(unsigned short __user *argp, unsigned short val) 275 { 276 return put_user(val, argp); 277 } 278 279 static int put_int(int __user *argp, int val) 280 { 281 return put_user(val, argp); 282 } 283 284 static int put_uint(unsigned int __user *argp, unsigned int val) 285 { 286 return put_user(val, argp); 287 } 288 289 static int put_long(long __user *argp, long val) 290 { 291 return put_user(val, argp); 292 } 293 294 static int put_ulong(unsigned long __user *argp, unsigned long val) 295 { 296 return put_user(val, argp); 297 } 298 299 static int put_u64(u64 __user *argp, u64 val) 300 { 301 return put_user(val, argp); 302 } 303 304 #ifdef CONFIG_COMPAT 305 static int compat_put_long(compat_long_t *argp, long val) 306 { 307 return put_user(val, argp); 308 } 309 310 static int compat_put_ulong(compat_ulong_t *argp, compat_ulong_t val) 311 { 312 return put_user(val, argp); 313 } 314 #endif 315 316 int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode, 317 unsigned cmd, unsigned long arg) 318 { 319 struct gendisk *disk = bdev->bd_disk; 320 321 if (disk->fops->ioctl) 322 return disk->fops->ioctl(bdev, mode, cmd, arg); 323 324 return -ENOTTY; 325 } 326 /* 327 * For the record: _GPL here is only because somebody decided to slap it 328 * on the previous export. Sheer idiocy, since it wasn't copyrightable 329 * at all and could be open-coded without any exports by anybody who cares. 330 */ 331 EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl); 332 333 #ifdef CONFIG_COMPAT 334 /* 335 * This is the equivalent of compat_ptr_ioctl(), to be used by block 336 * drivers that implement only commands that are completely compatible 337 * between 32-bit and 64-bit user space 338 */ 339 int blkdev_compat_ptr_ioctl(struct block_device *bdev, fmode_t mode, 340 unsigned cmd, unsigned long arg) 341 { 342 struct gendisk *disk = bdev->bd_disk; 343 344 if (disk->fops->ioctl) 345 return disk->fops->ioctl(bdev, mode, cmd, 346 (unsigned long)compat_ptr(arg)); 347 348 return -ENOIOCTLCMD; 349 } 350 EXPORT_SYMBOL(blkdev_compat_ptr_ioctl); 351 #endif 352 353 static int blkdev_pr_register(struct block_device *bdev, 354 struct pr_registration __user *arg) 355 { 356 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; 357 struct pr_registration reg; 358 359 if (!capable(CAP_SYS_ADMIN)) 360 return -EPERM; 361 if (!ops || !ops->pr_register) 362 return -EOPNOTSUPP; 363 if (copy_from_user(®, arg, sizeof(reg))) 364 return -EFAULT; 365 366 if (reg.flags & ~PR_FL_IGNORE_KEY) 367 return -EOPNOTSUPP; 368 return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags); 369 } 370 371 static int blkdev_pr_reserve(struct block_device *bdev, 372 struct pr_reservation __user *arg) 373 { 374 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; 375 struct pr_reservation rsv; 376 377 if (!capable(CAP_SYS_ADMIN)) 378 return -EPERM; 379 if (!ops || !ops->pr_reserve) 380 return -EOPNOTSUPP; 381 if (copy_from_user(&rsv, arg, sizeof(rsv))) 382 return -EFAULT; 383 384 if (rsv.flags & ~PR_FL_IGNORE_KEY) 385 return -EOPNOTSUPP; 386 return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags); 387 } 388 389 static int blkdev_pr_release(struct block_device *bdev, 390 struct pr_reservation __user *arg) 391 { 392 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; 393 struct pr_reservation rsv; 394 395 if (!capable(CAP_SYS_ADMIN)) 396 return -EPERM; 397 if (!ops || !ops->pr_release) 398 return -EOPNOTSUPP; 399 if (copy_from_user(&rsv, arg, sizeof(rsv))) 400 return -EFAULT; 401 402 if (rsv.flags) 403 return -EOPNOTSUPP; 404 return ops->pr_release(bdev, rsv.key, rsv.type); 405 } 406 407 static int blkdev_pr_preempt(struct block_device *bdev, 408 struct pr_preempt __user *arg, bool abort) 409 { 410 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; 411 struct pr_preempt p; 412 413 if (!capable(CAP_SYS_ADMIN)) 414 return -EPERM; 415 if (!ops || !ops->pr_preempt) 416 return -EOPNOTSUPP; 417 if (copy_from_user(&p, arg, sizeof(p))) 418 return -EFAULT; 419 420 if (p.flags) 421 return -EOPNOTSUPP; 422 return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort); 423 } 424 425 static int blkdev_pr_clear(struct block_device *bdev, 426 struct pr_clear __user *arg) 427 { 428 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; 429 struct pr_clear c; 430 431 if (!capable(CAP_SYS_ADMIN)) 432 return -EPERM; 433 if (!ops || !ops->pr_clear) 434 return -EOPNOTSUPP; 435 if (copy_from_user(&c, arg, sizeof(c))) 436 return -EFAULT; 437 438 if (c.flags) 439 return -EOPNOTSUPP; 440 return ops->pr_clear(bdev, c.key); 441 } 442 443 /* 444 * Is it an unrecognized ioctl? The correct returns are either 445 * ENOTTY (final) or ENOIOCTLCMD ("I don't know this one, try a 446 * fallback"). ENOIOCTLCMD gets turned into ENOTTY by the ioctl 447 * code before returning. 448 * 449 * Confused drivers sometimes return EINVAL, which is wrong. It 450 * means "I understood the ioctl command, but the parameters to 451 * it were wrong". 452 * 453 * We should aim to just fix the broken drivers, the EINVAL case 454 * should go away. 455 */ 456 static inline int is_unrecognized_ioctl(int ret) 457 { 458 return ret == -EINVAL || 459 ret == -ENOTTY || 460 ret == -ENOIOCTLCMD; 461 } 462 463 static int blkdev_flushbuf(struct block_device *bdev, fmode_t mode, 464 unsigned cmd, unsigned long arg) 465 { 466 int ret; 467 468 if (!capable(CAP_SYS_ADMIN)) 469 return -EACCES; 470 471 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); 472 if (!is_unrecognized_ioctl(ret)) 473 return ret; 474 475 fsync_bdev(bdev); 476 invalidate_bdev(bdev); 477 return 0; 478 } 479 480 static int blkdev_roset(struct block_device *bdev, fmode_t mode, 481 unsigned cmd, unsigned long arg) 482 { 483 int ret, n; 484 485 if (!capable(CAP_SYS_ADMIN)) 486 return -EACCES; 487 488 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); 489 if (!is_unrecognized_ioctl(ret)) 490 return ret; 491 if (get_user(n, (int __user *)arg)) 492 return -EFAULT; 493 set_device_ro(bdev, n); 494 return 0; 495 } 496 497 static int blkdev_getgeo(struct block_device *bdev, 498 struct hd_geometry __user *argp) 499 { 500 struct gendisk *disk = bdev->bd_disk; 501 struct hd_geometry geo; 502 int ret; 503 504 if (!argp) 505 return -EINVAL; 506 if (!disk->fops->getgeo) 507 return -ENOTTY; 508 509 /* 510 * We need to set the startsect first, the driver may 511 * want to override it. 512 */ 513 memset(&geo, 0, sizeof(geo)); 514 geo.start = get_start_sect(bdev); 515 ret = disk->fops->getgeo(bdev, &geo); 516 if (ret) 517 return ret; 518 if (copy_to_user(argp, &geo, sizeof(geo))) 519 return -EFAULT; 520 return 0; 521 } 522 523 #ifdef CONFIG_COMPAT 524 struct compat_hd_geometry { 525 unsigned char heads; 526 unsigned char sectors; 527 unsigned short cylinders; 528 u32 start; 529 }; 530 531 static int compat_hdio_getgeo(struct block_device *bdev, 532 struct compat_hd_geometry __user *ugeo) 533 { 534 struct gendisk *disk = bdev->bd_disk; 535 struct hd_geometry geo; 536 int ret; 537 538 if (!ugeo) 539 return -EINVAL; 540 if (!disk->fops->getgeo) 541 return -ENOTTY; 542 543 memset(&geo, 0, sizeof(geo)); 544 /* 545 * We need to set the startsect first, the driver may 546 * want to override it. 547 */ 548 geo.start = get_start_sect(bdev); 549 ret = disk->fops->getgeo(bdev, &geo); 550 if (ret) 551 return ret; 552 553 ret = copy_to_user(ugeo, &geo, 4); 554 ret |= put_user(geo.start, &ugeo->start); 555 if (ret) 556 ret = -EFAULT; 557 558 return ret; 559 } 560 #endif 561 562 /* set the logical block size */ 563 static int blkdev_bszset(struct block_device *bdev, fmode_t mode, 564 int __user *argp) 565 { 566 int ret, n; 567 568 if (!capable(CAP_SYS_ADMIN)) 569 return -EACCES; 570 if (!argp) 571 return -EINVAL; 572 if (get_user(n, argp)) 573 return -EFAULT; 574 575 if (!(mode & FMODE_EXCL)) { 576 bdgrab(bdev); 577 if (blkdev_get(bdev, mode | FMODE_EXCL, &bdev) < 0) 578 return -EBUSY; 579 } 580 581 ret = set_blocksize(bdev, n); 582 if (!(mode & FMODE_EXCL)) 583 blkdev_put(bdev, mode | FMODE_EXCL); 584 return ret; 585 } 586 587 /* 588 * Common commands that are handled the same way on native and compat 589 * user space. Note the separate arg/argp parameters that are needed 590 * to deal with the compat_ptr() conversion. 591 */ 592 static int blkdev_common_ioctl(struct block_device *bdev, fmode_t mode, 593 unsigned cmd, unsigned long arg, void __user *argp) 594 { 595 unsigned int max_sectors; 596 597 switch (cmd) { 598 case BLKFLSBUF: 599 return blkdev_flushbuf(bdev, mode, cmd, arg); 600 case BLKROSET: 601 return blkdev_roset(bdev, mode, cmd, arg); 602 case BLKDISCARD: 603 return blk_ioctl_discard(bdev, mode, arg, 0); 604 case BLKSECDISCARD: 605 return blk_ioctl_discard(bdev, mode, arg, 606 BLKDEV_DISCARD_SECURE); 607 case BLKZEROOUT: 608 return blk_ioctl_zeroout(bdev, mode, arg); 609 case BLKREPORTZONE: 610 return blkdev_report_zones_ioctl(bdev, mode, cmd, arg); 611 case BLKRESETZONE: 612 case BLKOPENZONE: 613 case BLKCLOSEZONE: 614 case BLKFINISHZONE: 615 return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg); 616 case BLKGETZONESZ: 617 return put_uint(argp, bdev_zone_sectors(bdev)); 618 case BLKGETNRZONES: 619 return put_uint(argp, blkdev_nr_zones(bdev->bd_disk)); 620 case BLKROGET: 621 return put_int(argp, bdev_read_only(bdev) != 0); 622 case BLKSSZGET: /* get block device logical block size */ 623 return put_int(argp, bdev_logical_block_size(bdev)); 624 case BLKPBSZGET: /* get block device physical block size */ 625 return put_uint(argp, bdev_physical_block_size(bdev)); 626 case BLKIOMIN: 627 return put_uint(argp, bdev_io_min(bdev)); 628 case BLKIOOPT: 629 return put_uint(argp, bdev_io_opt(bdev)); 630 case BLKALIGNOFF: 631 return put_int(argp, bdev_alignment_offset(bdev)); 632 case BLKDISCARDZEROES: 633 return put_uint(argp, 0); 634 case BLKSECTGET: 635 max_sectors = min_t(unsigned int, USHRT_MAX, 636 queue_max_sectors(bdev_get_queue(bdev))); 637 return put_ushort(argp, max_sectors); 638 case BLKROTATIONAL: 639 return put_ushort(argp, !blk_queue_nonrot(bdev_get_queue(bdev))); 640 case BLKRASET: 641 case BLKFRASET: 642 if(!capable(CAP_SYS_ADMIN)) 643 return -EACCES; 644 bdev->bd_bdi->ra_pages = (arg * 512) / PAGE_SIZE; 645 return 0; 646 case BLKRRPART: 647 return blkdev_reread_part(bdev); 648 case BLKTRACESTART: 649 case BLKTRACESTOP: 650 case BLKTRACETEARDOWN: 651 return blk_trace_ioctl(bdev, cmd, argp); 652 case IOC_PR_REGISTER: 653 return blkdev_pr_register(bdev, argp); 654 case IOC_PR_RESERVE: 655 return blkdev_pr_reserve(bdev, argp); 656 case IOC_PR_RELEASE: 657 return blkdev_pr_release(bdev, argp); 658 case IOC_PR_PREEMPT: 659 return blkdev_pr_preempt(bdev, argp, false); 660 case IOC_PR_PREEMPT_ABORT: 661 return blkdev_pr_preempt(bdev, argp, true); 662 case IOC_PR_CLEAR: 663 return blkdev_pr_clear(bdev, argp); 664 default: 665 return -ENOIOCTLCMD; 666 } 667 } 668 669 /* 670 * Always keep this in sync with compat_blkdev_ioctl() 671 * to handle all incompatible commands in both functions. 672 * 673 * New commands must be compatible and go into blkdev_common_ioctl 674 */ 675 int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, 676 unsigned long arg) 677 { 678 int ret; 679 loff_t size; 680 void __user *argp = (void __user *)arg; 681 682 switch (cmd) { 683 /* These need separate implementations for the data structure */ 684 case HDIO_GETGEO: 685 return blkdev_getgeo(bdev, argp); 686 case BLKPG: 687 return blkpg_ioctl(bdev, argp); 688 689 /* Compat mode returns 32-bit data instead of 'long' */ 690 case BLKRAGET: 691 case BLKFRAGET: 692 if (!argp) 693 return -EINVAL; 694 return put_long(argp, (bdev->bd_bdi->ra_pages*PAGE_SIZE) / 512); 695 case BLKGETSIZE: 696 size = i_size_read(bdev->bd_inode); 697 if ((size >> 9) > ~0UL) 698 return -EFBIG; 699 return put_ulong(argp, size >> 9); 700 701 /* The data is compatible, but the command number is different */ 702 case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */ 703 return put_int(argp, block_size(bdev)); 704 case BLKBSZSET: 705 return blkdev_bszset(bdev, mode, argp); 706 case BLKGETSIZE64: 707 return put_u64(argp, i_size_read(bdev->bd_inode)); 708 709 /* Incompatible alignment on i386 */ 710 case BLKTRACESETUP: 711 return blk_trace_ioctl(bdev, cmd, argp); 712 default: 713 break; 714 } 715 716 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp); 717 if (ret == -ENOIOCTLCMD) 718 return __blkdev_driver_ioctl(bdev, mode, cmd, arg); 719 720 return ret; 721 } 722 EXPORT_SYMBOL_GPL(blkdev_ioctl); /* for /dev/raw */ 723 724 #ifdef CONFIG_COMPAT 725 726 #define BLKBSZGET_32 _IOR(0x12, 112, int) 727 #define BLKBSZSET_32 _IOW(0x12, 113, int) 728 #define BLKGETSIZE64_32 _IOR(0x12, 114, int) 729 730 /* Most of the generic ioctls are handled in the normal fallback path. 731 This assumes the blkdev's low level compat_ioctl always returns 732 ENOIOCTLCMD for unknown ioctls. */ 733 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg) 734 { 735 int ret; 736 void __user *argp = compat_ptr(arg); 737 struct inode *inode = file->f_mapping->host; 738 struct block_device *bdev = inode->i_bdev; 739 struct gendisk *disk = bdev->bd_disk; 740 fmode_t mode = file->f_mode; 741 loff_t size; 742 743 /* 744 * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have 745 * to updated it before every ioctl. 746 */ 747 if (file->f_flags & O_NDELAY) 748 mode |= FMODE_NDELAY; 749 else 750 mode &= ~FMODE_NDELAY; 751 752 switch (cmd) { 753 /* These need separate implementations for the data structure */ 754 case HDIO_GETGEO: 755 return compat_hdio_getgeo(bdev, argp); 756 case BLKPG: 757 return compat_blkpg_ioctl(bdev, argp); 758 759 /* Compat mode returns 32-bit data instead of 'long' */ 760 case BLKRAGET: 761 case BLKFRAGET: 762 if (!argp) 763 return -EINVAL; 764 return compat_put_long(argp, 765 (bdev->bd_bdi->ra_pages * PAGE_SIZE) / 512); 766 case BLKGETSIZE: 767 size = i_size_read(bdev->bd_inode); 768 if ((size >> 9) > ~0UL) 769 return -EFBIG; 770 return compat_put_ulong(argp, size >> 9); 771 772 /* The data is compatible, but the command number is different */ 773 case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */ 774 return put_int(argp, bdev_logical_block_size(bdev)); 775 case BLKBSZSET_32: 776 return blkdev_bszset(bdev, mode, argp); 777 case BLKGETSIZE64_32: 778 return put_u64(argp, i_size_read(bdev->bd_inode)); 779 780 /* Incompatible alignment on i386 */ 781 case BLKTRACESETUP32: 782 return blk_trace_ioctl(bdev, cmd, argp); 783 default: 784 break; 785 } 786 787 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp); 788 if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl) 789 ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg); 790 791 return ret; 792 } 793 #endif 794