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>
7 #include <linux/blkpg.h>
8 #include <linux/hdreg.h>
9 #include <linux/backing-dev.h>
11 #include <linux/blktrace_api.h>
13 #include <linux/uaccess.h>
16 static int blkpg_do_ioctl(struct block_device
*bdev
,
17 struct blkpg_partition __user
*upart
, int op
)
19 struct gendisk
*disk
= bdev
->bd_disk
;
20 struct blkpg_partition p
;
21 long long start
, length
;
23 if (!capable(CAP_SYS_ADMIN
))
25 if (copy_from_user(&p
, upart
, sizeof(struct blkpg_partition
)))
27 if (bdev_is_partition(bdev
))
33 if (op
== BLKPG_DEL_PARTITION
)
34 return bdev_del_partition(disk
, p
.pno
);
36 start
= p
.start
>> SECTOR_SHIFT
;
37 length
= p
.length
>> SECTOR_SHIFT
;
40 case BLKPG_ADD_PARTITION
:
41 /* check if partition is aligned to blocksize */
42 if (p
.start
& (bdev_logical_block_size(bdev
) - 1))
44 return bdev_add_partition(disk
, p
.pno
, start
, length
);
45 case BLKPG_RESIZE_PARTITION
:
46 return bdev_resize_partition(disk
, p
.pno
, start
, length
);
52 static int blkpg_ioctl(struct block_device
*bdev
,
53 struct blkpg_ioctl_arg __user
*arg
)
55 struct blkpg_partition __user
*udata
;
58 if (get_user(op
, &arg
->op
) || get_user(udata
, &arg
->data
))
61 return blkpg_do_ioctl(bdev
, udata
, op
);
65 struct compat_blkpg_ioctl_arg
{
72 static int compat_blkpg_ioctl(struct block_device
*bdev
,
73 struct compat_blkpg_ioctl_arg __user
*arg
)
78 if (get_user(op
, &arg
->op
) || get_user(udata
, &arg
->data
))
81 return blkpg_do_ioctl(bdev
, compat_ptr(udata
), op
);
85 static int blkdev_reread_part(struct block_device
*bdev
, fmode_t mode
)
87 struct block_device
*tmp
;
89 if (!disk_part_scan_enabled(bdev
->bd_disk
) || bdev_is_partition(bdev
))
91 if (!capable(CAP_SYS_ADMIN
))
93 if (bdev
->bd_disk
->open_partitions
)
97 * Reopen the device to revalidate the driver state and force a
101 set_bit(GD_NEED_PART_SCAN
, &bdev
->bd_disk
->state
);
103 tmp
= blkdev_get_by_dev(bdev
->bd_dev
, mode
, NULL
);
106 blkdev_put(tmp
, mode
);
110 static int blk_ioctl_discard(struct block_device
*bdev
, fmode_t mode
,
111 unsigned long arg
, unsigned long flags
)
115 struct request_queue
*q
= bdev_get_queue(bdev
);
118 if (!(mode
& FMODE_WRITE
))
121 if (!blk_queue_discard(q
))
124 if (copy_from_user(range
, (void __user
*)arg
, sizeof(range
)))
135 if (start
+ len
> i_size_read(bdev
->bd_inode
))
138 err
= truncate_bdev_range(bdev
, mode
, start
, start
+ len
- 1);
142 return blkdev_issue_discard(bdev
, start
>> 9, len
>> 9,
146 static int blk_ioctl_zeroout(struct block_device
*bdev
, fmode_t mode
,
150 uint64_t start
, end
, len
;
153 if (!(mode
& FMODE_WRITE
))
156 if (copy_from_user(range
, (void __user
*)arg
, sizeof(range
)))
161 end
= start
+ len
- 1;
167 if (end
>= (uint64_t)i_size_read(bdev
->bd_inode
))
172 /* Invalidate the page cache, including dirty pages */
173 err
= truncate_bdev_range(bdev
, mode
, start
, end
);
177 return blkdev_issue_zeroout(bdev
, start
>> 9, len
>> 9, GFP_KERNEL
,
178 BLKDEV_ZERO_NOUNMAP
);
181 static int put_ushort(unsigned short __user
*argp
, unsigned short val
)
183 return put_user(val
, argp
);
186 static int put_int(int __user
*argp
, int val
)
188 return put_user(val
, argp
);
191 static int put_uint(unsigned int __user
*argp
, unsigned int val
)
193 return put_user(val
, argp
);
196 static int put_long(long __user
*argp
, long val
)
198 return put_user(val
, argp
);
201 static int put_ulong(unsigned long __user
*argp
, unsigned long val
)
203 return put_user(val
, argp
);
206 static int put_u64(u64 __user
*argp
, u64 val
)
208 return put_user(val
, argp
);
212 static int compat_put_long(compat_long_t __user
*argp
, long val
)
214 return put_user(val
, argp
);
217 static int compat_put_ulong(compat_ulong_t __user
*argp
, compat_ulong_t val
)
219 return put_user(val
, argp
);
225 * This is the equivalent of compat_ptr_ioctl(), to be used by block
226 * drivers that implement only commands that are completely compatible
227 * between 32-bit and 64-bit user space
229 int blkdev_compat_ptr_ioctl(struct block_device
*bdev
, fmode_t mode
,
230 unsigned cmd
, unsigned long arg
)
232 struct gendisk
*disk
= bdev
->bd_disk
;
234 if (disk
->fops
->ioctl
)
235 return disk
->fops
->ioctl(bdev
, mode
, cmd
,
236 (unsigned long)compat_ptr(arg
));
240 EXPORT_SYMBOL(blkdev_compat_ptr_ioctl
);
243 static int blkdev_pr_register(struct block_device
*bdev
,
244 struct pr_registration __user
*arg
)
246 const struct pr_ops
*ops
= bdev
->bd_disk
->fops
->pr_ops
;
247 struct pr_registration reg
;
249 if (!capable(CAP_SYS_ADMIN
))
251 if (!ops
|| !ops
->pr_register
)
253 if (copy_from_user(®
, arg
, sizeof(reg
)))
256 if (reg
.flags
& ~PR_FL_IGNORE_KEY
)
258 return ops
->pr_register(bdev
, reg
.old_key
, reg
.new_key
, reg
.flags
);
261 static int blkdev_pr_reserve(struct block_device
*bdev
,
262 struct pr_reservation __user
*arg
)
264 const struct pr_ops
*ops
= bdev
->bd_disk
->fops
->pr_ops
;
265 struct pr_reservation rsv
;
267 if (!capable(CAP_SYS_ADMIN
))
269 if (!ops
|| !ops
->pr_reserve
)
271 if (copy_from_user(&rsv
, arg
, sizeof(rsv
)))
274 if (rsv
.flags
& ~PR_FL_IGNORE_KEY
)
276 return ops
->pr_reserve(bdev
, rsv
.key
, rsv
.type
, rsv
.flags
);
279 static int blkdev_pr_release(struct block_device
*bdev
,
280 struct pr_reservation __user
*arg
)
282 const struct pr_ops
*ops
= bdev
->bd_disk
->fops
->pr_ops
;
283 struct pr_reservation rsv
;
285 if (!capable(CAP_SYS_ADMIN
))
287 if (!ops
|| !ops
->pr_release
)
289 if (copy_from_user(&rsv
, arg
, sizeof(rsv
)))
294 return ops
->pr_release(bdev
, rsv
.key
, rsv
.type
);
297 static int blkdev_pr_preempt(struct block_device
*bdev
,
298 struct pr_preempt __user
*arg
, bool abort
)
300 const struct pr_ops
*ops
= bdev
->bd_disk
->fops
->pr_ops
;
303 if (!capable(CAP_SYS_ADMIN
))
305 if (!ops
|| !ops
->pr_preempt
)
307 if (copy_from_user(&p
, arg
, sizeof(p
)))
312 return ops
->pr_preempt(bdev
, p
.old_key
, p
.new_key
, p
.type
, abort
);
315 static int blkdev_pr_clear(struct block_device
*bdev
,
316 struct pr_clear __user
*arg
)
318 const struct pr_ops
*ops
= bdev
->bd_disk
->fops
->pr_ops
;
321 if (!capable(CAP_SYS_ADMIN
))
323 if (!ops
|| !ops
->pr_clear
)
325 if (copy_from_user(&c
, arg
, sizeof(c
)))
330 return ops
->pr_clear(bdev
, c
.key
);
333 static int blkdev_flushbuf(struct block_device
*bdev
, fmode_t mode
,
334 unsigned cmd
, unsigned long arg
)
336 if (!capable(CAP_SYS_ADMIN
))
339 invalidate_bdev(bdev
);
343 static int blkdev_roset(struct block_device
*bdev
, fmode_t mode
,
344 unsigned cmd
, unsigned long arg
)
348 if (!capable(CAP_SYS_ADMIN
))
351 if (get_user(n
, (int __user
*)arg
))
353 if (bdev
->bd_disk
->fops
->set_read_only
) {
354 ret
= bdev
->bd_disk
->fops
->set_read_only(bdev
, n
);
358 bdev
->bd_read_only
= n
;
362 static int blkdev_getgeo(struct block_device
*bdev
,
363 struct hd_geometry __user
*argp
)
365 struct gendisk
*disk
= bdev
->bd_disk
;
366 struct hd_geometry geo
;
371 if (!disk
->fops
->getgeo
)
375 * We need to set the startsect first, the driver may
376 * want to override it.
378 memset(&geo
, 0, sizeof(geo
));
379 geo
.start
= get_start_sect(bdev
);
380 ret
= disk
->fops
->getgeo(bdev
, &geo
);
383 if (copy_to_user(argp
, &geo
, sizeof(geo
)))
389 struct compat_hd_geometry
{
391 unsigned char sectors
;
392 unsigned short cylinders
;
396 static int compat_hdio_getgeo(struct block_device
*bdev
,
397 struct compat_hd_geometry __user
*ugeo
)
399 struct gendisk
*disk
= bdev
->bd_disk
;
400 struct hd_geometry geo
;
405 if (!disk
->fops
->getgeo
)
408 memset(&geo
, 0, sizeof(geo
));
410 * We need to set the startsect first, the driver may
411 * want to override it.
413 geo
.start
= get_start_sect(bdev
);
414 ret
= disk
->fops
->getgeo(bdev
, &geo
);
418 ret
= copy_to_user(ugeo
, &geo
, 4);
419 ret
|= put_user(geo
.start
, &ugeo
->start
);
427 /* set the logical block size */
428 static int blkdev_bszset(struct block_device
*bdev
, fmode_t mode
,
433 if (!capable(CAP_SYS_ADMIN
))
437 if (get_user(n
, argp
))
440 if (mode
& FMODE_EXCL
)
441 return set_blocksize(bdev
, n
);
443 if (IS_ERR(blkdev_get_by_dev(bdev
->bd_dev
, mode
| FMODE_EXCL
, &bdev
)))
445 ret
= set_blocksize(bdev
, n
);
446 blkdev_put(bdev
, mode
| FMODE_EXCL
);
452 * Common commands that are handled the same way on native and compat
453 * user space. Note the separate arg/argp parameters that are needed
454 * to deal with the compat_ptr() conversion.
456 static int blkdev_common_ioctl(struct block_device
*bdev
, fmode_t mode
,
457 unsigned cmd
, unsigned long arg
, void __user
*argp
)
459 unsigned int max_sectors
;
463 return blkdev_flushbuf(bdev
, mode
, cmd
, arg
);
465 return blkdev_roset(bdev
, mode
, cmd
, arg
);
467 return blk_ioctl_discard(bdev
, mode
, arg
, 0);
469 return blk_ioctl_discard(bdev
, mode
, arg
,
470 BLKDEV_DISCARD_SECURE
);
472 return blk_ioctl_zeroout(bdev
, mode
, arg
);
474 return put_u64(argp
, bdev
->bd_disk
->diskseq
);
476 return blkdev_report_zones_ioctl(bdev
, mode
, cmd
, arg
);
481 return blkdev_zone_mgmt_ioctl(bdev
, mode
, cmd
, arg
);
483 return put_uint(argp
, bdev_zone_sectors(bdev
));
485 return put_uint(argp
, blkdev_nr_zones(bdev
->bd_disk
));
487 return put_int(argp
, bdev_read_only(bdev
) != 0);
488 case BLKSSZGET
: /* get block device logical block size */
489 return put_int(argp
, bdev_logical_block_size(bdev
));
490 case BLKPBSZGET
: /* get block device physical block size */
491 return put_uint(argp
, bdev_physical_block_size(bdev
));
493 return put_uint(argp
, bdev_io_min(bdev
));
495 return put_uint(argp
, bdev_io_opt(bdev
));
497 return put_int(argp
, bdev_alignment_offset(bdev
));
498 case BLKDISCARDZEROES
:
499 return put_uint(argp
, 0);
501 max_sectors
= min_t(unsigned int, USHRT_MAX
,
502 queue_max_sectors(bdev_get_queue(bdev
)));
503 return put_ushort(argp
, max_sectors
);
505 return put_ushort(argp
, !blk_queue_nonrot(bdev_get_queue(bdev
)));
508 if(!capable(CAP_SYS_ADMIN
))
510 bdev
->bd_disk
->bdi
->ra_pages
= (arg
* 512) / PAGE_SIZE
;
513 return blkdev_reread_part(bdev
, mode
);
516 case BLKTRACETEARDOWN
:
517 return blk_trace_ioctl(bdev
, cmd
, argp
);
518 case IOC_PR_REGISTER
:
519 return blkdev_pr_register(bdev
, argp
);
521 return blkdev_pr_reserve(bdev
, argp
);
523 return blkdev_pr_release(bdev
, argp
);
525 return blkdev_pr_preempt(bdev
, argp
, false);
526 case IOC_PR_PREEMPT_ABORT
:
527 return blkdev_pr_preempt(bdev
, argp
, true);
529 return blkdev_pr_clear(bdev
, argp
);
536 * Always keep this in sync with compat_blkdev_ioctl()
537 * to handle all incompatible commands in both functions.
539 * New commands must be compatible and go into blkdev_common_ioctl
541 int blkdev_ioctl(struct block_device
*bdev
, fmode_t mode
, unsigned cmd
,
546 void __user
*argp
= (void __user
*)arg
;
549 /* These need separate implementations for the data structure */
551 return blkdev_getgeo(bdev
, argp
);
553 return blkpg_ioctl(bdev
, argp
);
555 /* Compat mode returns 32-bit data instead of 'long' */
560 return put_long(argp
,
561 (bdev
->bd_disk
->bdi
->ra_pages
* PAGE_SIZE
) / 512);
563 size
= i_size_read(bdev
->bd_inode
);
564 if ((size
>> 9) > ~0UL)
566 return put_ulong(argp
, size
>> 9);
568 /* The data is compatible, but the command number is different */
569 case BLKBSZGET
: /* get block device soft block size (cf. BLKSSZGET) */
570 return put_int(argp
, block_size(bdev
));
572 return blkdev_bszset(bdev
, mode
, argp
);
574 return put_u64(argp
, i_size_read(bdev
->bd_inode
));
576 /* Incompatible alignment on i386 */
578 return blk_trace_ioctl(bdev
, cmd
, argp
);
583 ret
= blkdev_common_ioctl(bdev
, mode
, cmd
, arg
, argp
);
584 if (ret
!= -ENOIOCTLCMD
)
587 if (!bdev
->bd_disk
->fops
->ioctl
)
589 return bdev
->bd_disk
->fops
->ioctl(bdev
, mode
, cmd
, arg
);
591 EXPORT_SYMBOL_GPL(blkdev_ioctl
); /* for /dev/raw */
595 #define BLKBSZGET_32 _IOR(0x12, 112, int)
596 #define BLKBSZSET_32 _IOW(0x12, 113, int)
597 #define BLKGETSIZE64_32 _IOR(0x12, 114, int)
599 /* Most of the generic ioctls are handled in the normal fallback path.
600 This assumes the blkdev's low level compat_ioctl always returns
601 ENOIOCTLCMD for unknown ioctls. */
602 long compat_blkdev_ioctl(struct file
*file
, unsigned cmd
, unsigned long arg
)
605 void __user
*argp
= compat_ptr(arg
);
606 struct block_device
*bdev
= I_BDEV(file
->f_mapping
->host
);
607 struct gendisk
*disk
= bdev
->bd_disk
;
608 fmode_t mode
= file
->f_mode
;
612 * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
613 * to updated it before every ioctl.
615 if (file
->f_flags
& O_NDELAY
)
616 mode
|= FMODE_NDELAY
;
618 mode
&= ~FMODE_NDELAY
;
621 /* These need separate implementations for the data structure */
623 return compat_hdio_getgeo(bdev
, argp
);
625 return compat_blkpg_ioctl(bdev
, argp
);
627 /* Compat mode returns 32-bit data instead of 'long' */
632 return compat_put_long(argp
,
633 (bdev
->bd_disk
->bdi
->ra_pages
* PAGE_SIZE
) / 512);
635 size
= i_size_read(bdev
->bd_inode
);
636 if ((size
>> 9) > ~0UL)
638 return compat_put_ulong(argp
, size
>> 9);
640 /* The data is compatible, but the command number is different */
641 case BLKBSZGET_32
: /* get the logical block size (cf. BLKSSZGET) */
642 return put_int(argp
, bdev_logical_block_size(bdev
));
644 return blkdev_bszset(bdev
, mode
, argp
);
645 case BLKGETSIZE64_32
:
646 return put_u64(argp
, i_size_read(bdev
->bd_inode
));
648 /* Incompatible alignment on i386 */
649 case BLKTRACESETUP32
:
650 return blk_trace_ioctl(bdev
, cmd
, argp
);
655 ret
= blkdev_common_ioctl(bdev
, mode
, cmd
, arg
, argp
);
656 if (ret
== -ENOIOCTLCMD
&& disk
->fops
->compat_ioctl
)
657 ret
= disk
->fops
->compat_ioctl(bdev
, mode
, cmd
, arg
);