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 (disk
->flags
& GENHD_FL_NO_PART
)
25 if (!capable(CAP_SYS_ADMIN
))
27 if (copy_from_user(&p
, upart
, sizeof(struct blkpg_partition
)))
29 if (bdev_is_partition(bdev
))
35 if (op
== BLKPG_DEL_PARTITION
)
36 return bdev_del_partition(disk
, p
.pno
);
38 start
= p
.start
>> SECTOR_SHIFT
;
39 length
= p
.length
>> SECTOR_SHIFT
;
42 case BLKPG_ADD_PARTITION
:
43 /* check if partition is aligned to blocksize */
44 if (p
.start
& (bdev_logical_block_size(bdev
) - 1))
46 return bdev_add_partition(disk
, p
.pno
, start
, length
);
47 case BLKPG_RESIZE_PARTITION
:
48 return bdev_resize_partition(disk
, p
.pno
, start
, length
);
54 static int blkpg_ioctl(struct block_device
*bdev
,
55 struct blkpg_ioctl_arg __user
*arg
)
57 struct blkpg_partition __user
*udata
;
60 if (get_user(op
, &arg
->op
) || get_user(udata
, &arg
->data
))
63 return blkpg_do_ioctl(bdev
, udata
, op
);
67 struct compat_blkpg_ioctl_arg
{
74 static int compat_blkpg_ioctl(struct block_device
*bdev
,
75 struct compat_blkpg_ioctl_arg __user
*arg
)
80 if (get_user(op
, &arg
->op
) || get_user(udata
, &arg
->data
))
83 return blkpg_do_ioctl(bdev
, compat_ptr(udata
), op
);
87 static int blk_ioctl_discard(struct block_device
*bdev
, blk_mode_t mode
,
92 struct inode
*inode
= bdev
->bd_inode
;
95 if (!(mode
& BLK_OPEN_WRITE
))
98 if (!bdev_max_discard_sectors(bdev
))
101 if (copy_from_user(range
, (void __user
*)arg
, sizeof(range
)))
112 if (start
+ len
> bdev_nr_bytes(bdev
))
115 filemap_invalidate_lock(inode
->i_mapping
);
116 err
= truncate_bdev_range(bdev
, mode
, start
, start
+ len
- 1);
119 err
= blkdev_issue_discard(bdev
, start
>> 9, len
>> 9, GFP_KERNEL
);
121 filemap_invalidate_unlock(inode
->i_mapping
);
125 static int blk_ioctl_secure_erase(struct block_device
*bdev
, blk_mode_t mode
,
132 if (!(mode
& BLK_OPEN_WRITE
))
134 if (!bdev_max_secure_erase_sectors(bdev
))
136 if (copy_from_user(range
, argp
, sizeof(range
)))
141 if ((start
& 511) || (len
& 511))
143 if (start
+ len
> bdev_nr_bytes(bdev
))
146 filemap_invalidate_lock(bdev
->bd_inode
->i_mapping
);
147 err
= truncate_bdev_range(bdev
, mode
, start
, start
+ len
- 1);
149 err
= blkdev_issue_secure_erase(bdev
, start
>> 9, len
>> 9,
151 filemap_invalidate_unlock(bdev
->bd_inode
->i_mapping
);
156 static int blk_ioctl_zeroout(struct block_device
*bdev
, blk_mode_t mode
,
160 uint64_t start
, end
, len
;
161 struct inode
*inode
= bdev
->bd_inode
;
164 if (!(mode
& BLK_OPEN_WRITE
))
167 if (copy_from_user(range
, (void __user
*)arg
, sizeof(range
)))
172 end
= start
+ len
- 1;
178 if (end
>= (uint64_t)bdev_nr_bytes(bdev
))
183 /* Invalidate the page cache, including dirty pages */
184 filemap_invalidate_lock(inode
->i_mapping
);
185 err
= truncate_bdev_range(bdev
, mode
, start
, end
);
189 err
= blkdev_issue_zeroout(bdev
, start
>> 9, len
>> 9, GFP_KERNEL
,
190 BLKDEV_ZERO_NOUNMAP
);
193 filemap_invalidate_unlock(inode
->i_mapping
);
197 static int put_ushort(unsigned short __user
*argp
, unsigned short val
)
199 return put_user(val
, argp
);
202 static int put_int(int __user
*argp
, int val
)
204 return put_user(val
, argp
);
207 static int put_uint(unsigned int __user
*argp
, unsigned int val
)
209 return put_user(val
, argp
);
212 static int put_long(long __user
*argp
, long val
)
214 return put_user(val
, argp
);
217 static int put_ulong(unsigned long __user
*argp
, unsigned long val
)
219 return put_user(val
, argp
);
222 static int put_u64(u64 __user
*argp
, u64 val
)
224 return put_user(val
, argp
);
228 static int compat_put_long(compat_long_t __user
*argp
, long val
)
230 return put_user(val
, argp
);
233 static int compat_put_ulong(compat_ulong_t __user
*argp
, compat_ulong_t val
)
235 return put_user(val
, argp
);
241 * This is the equivalent of compat_ptr_ioctl(), to be used by block
242 * drivers that implement only commands that are completely compatible
243 * between 32-bit and 64-bit user space
245 int blkdev_compat_ptr_ioctl(struct block_device
*bdev
, blk_mode_t mode
,
246 unsigned cmd
, unsigned long arg
)
248 struct gendisk
*disk
= bdev
->bd_disk
;
250 if (disk
->fops
->ioctl
)
251 return disk
->fops
->ioctl(bdev
, mode
, cmd
,
252 (unsigned long)compat_ptr(arg
));
256 EXPORT_SYMBOL(blkdev_compat_ptr_ioctl
);
259 static bool blkdev_pr_allowed(struct block_device
*bdev
, blk_mode_t mode
)
261 /* no sense to make reservations for partitions */
262 if (bdev_is_partition(bdev
))
265 if (capable(CAP_SYS_ADMIN
))
268 * Only allow unprivileged reservations if the file descriptor is open
271 return mode
& BLK_OPEN_WRITE
;
274 static int blkdev_pr_register(struct block_device
*bdev
, blk_mode_t mode
,
275 struct pr_registration __user
*arg
)
277 const struct pr_ops
*ops
= bdev
->bd_disk
->fops
->pr_ops
;
278 struct pr_registration reg
;
280 if (!blkdev_pr_allowed(bdev
, mode
))
282 if (!ops
|| !ops
->pr_register
)
284 if (copy_from_user(®
, arg
, sizeof(reg
)))
287 if (reg
.flags
& ~PR_FL_IGNORE_KEY
)
289 return ops
->pr_register(bdev
, reg
.old_key
, reg
.new_key
, reg
.flags
);
292 static int blkdev_pr_reserve(struct block_device
*bdev
, blk_mode_t mode
,
293 struct pr_reservation __user
*arg
)
295 const struct pr_ops
*ops
= bdev
->bd_disk
->fops
->pr_ops
;
296 struct pr_reservation rsv
;
298 if (!blkdev_pr_allowed(bdev
, mode
))
300 if (!ops
|| !ops
->pr_reserve
)
302 if (copy_from_user(&rsv
, arg
, sizeof(rsv
)))
305 if (rsv
.flags
& ~PR_FL_IGNORE_KEY
)
307 return ops
->pr_reserve(bdev
, rsv
.key
, rsv
.type
, rsv
.flags
);
310 static int blkdev_pr_release(struct block_device
*bdev
, blk_mode_t mode
,
311 struct pr_reservation __user
*arg
)
313 const struct pr_ops
*ops
= bdev
->bd_disk
->fops
->pr_ops
;
314 struct pr_reservation rsv
;
316 if (!blkdev_pr_allowed(bdev
, mode
))
318 if (!ops
|| !ops
->pr_release
)
320 if (copy_from_user(&rsv
, arg
, sizeof(rsv
)))
325 return ops
->pr_release(bdev
, rsv
.key
, rsv
.type
);
328 static int blkdev_pr_preempt(struct block_device
*bdev
, blk_mode_t mode
,
329 struct pr_preempt __user
*arg
, bool abort
)
331 const struct pr_ops
*ops
= bdev
->bd_disk
->fops
->pr_ops
;
334 if (!blkdev_pr_allowed(bdev
, mode
))
336 if (!ops
|| !ops
->pr_preempt
)
338 if (copy_from_user(&p
, arg
, sizeof(p
)))
343 return ops
->pr_preempt(bdev
, p
.old_key
, p
.new_key
, p
.type
, abort
);
346 static int blkdev_pr_clear(struct block_device
*bdev
, blk_mode_t mode
,
347 struct pr_clear __user
*arg
)
349 const struct pr_ops
*ops
= bdev
->bd_disk
->fops
->pr_ops
;
352 if (!blkdev_pr_allowed(bdev
, mode
))
354 if (!ops
|| !ops
->pr_clear
)
356 if (copy_from_user(&c
, arg
, sizeof(c
)))
361 return ops
->pr_clear(bdev
, c
.key
);
364 static int blkdev_flushbuf(struct block_device
*bdev
, unsigned cmd
,
367 if (!capable(CAP_SYS_ADMIN
))
370 mutex_lock(&bdev
->bd_holder_lock
);
371 if (bdev
->bd_holder_ops
&& bdev
->bd_holder_ops
->sync
)
372 bdev
->bd_holder_ops
->sync(bdev
);
374 mutex_unlock(&bdev
->bd_holder_lock
);
378 invalidate_bdev(bdev
);
382 static int blkdev_roset(struct block_device
*bdev
, unsigned cmd
,
387 if (!capable(CAP_SYS_ADMIN
))
390 if (get_user(n
, (int __user
*)arg
))
392 if (bdev
->bd_disk
->fops
->set_read_only
) {
393 ret
= bdev
->bd_disk
->fops
->set_read_only(bdev
, n
);
397 bdev
->bd_read_only
= n
;
401 static int blkdev_getgeo(struct block_device
*bdev
,
402 struct hd_geometry __user
*argp
)
404 struct gendisk
*disk
= bdev
->bd_disk
;
405 struct hd_geometry geo
;
410 if (!disk
->fops
->getgeo
)
414 * We need to set the startsect first, the driver may
415 * want to override it.
417 memset(&geo
, 0, sizeof(geo
));
418 geo
.start
= get_start_sect(bdev
);
419 ret
= disk
->fops
->getgeo(bdev
, &geo
);
422 if (copy_to_user(argp
, &geo
, sizeof(geo
)))
428 struct compat_hd_geometry
{
430 unsigned char sectors
;
431 unsigned short cylinders
;
435 static int compat_hdio_getgeo(struct block_device
*bdev
,
436 struct compat_hd_geometry __user
*ugeo
)
438 struct gendisk
*disk
= bdev
->bd_disk
;
439 struct hd_geometry geo
;
444 if (!disk
->fops
->getgeo
)
447 memset(&geo
, 0, sizeof(geo
));
449 * We need to set the startsect first, the driver may
450 * want to override it.
452 geo
.start
= get_start_sect(bdev
);
453 ret
= disk
->fops
->getgeo(bdev
, &geo
);
457 ret
= copy_to_user(ugeo
, &geo
, 4);
458 ret
|= put_user(geo
.start
, &ugeo
->start
);
466 /* set the logical block size */
467 static int blkdev_bszset(struct block_device
*bdev
, blk_mode_t mode
,
471 struct bdev_handle
*handle
;
473 if (!capable(CAP_SYS_ADMIN
))
477 if (get_user(n
, argp
))
480 if (mode
& BLK_OPEN_EXCL
)
481 return set_blocksize(bdev
, n
);
483 handle
= bdev_open_by_dev(bdev
->bd_dev
, mode
, &bdev
, NULL
);
486 ret
= set_blocksize(bdev
, n
);
487 bdev_release(handle
);
493 * Common commands that are handled the same way on native and compat
494 * user space. Note the separate arg/argp parameters that are needed
495 * to deal with the compat_ptr() conversion.
497 static int blkdev_common_ioctl(struct block_device
*bdev
, blk_mode_t mode
,
498 unsigned int cmd
, unsigned long arg
,
501 unsigned int max_sectors
;
505 return blkdev_flushbuf(bdev
, cmd
, arg
);
507 return blkdev_roset(bdev
, cmd
, arg
);
509 return blk_ioctl_discard(bdev
, mode
, arg
);
511 return blk_ioctl_secure_erase(bdev
, mode
, argp
);
513 return blk_ioctl_zeroout(bdev
, mode
, arg
);
515 return put_u64(argp
, bdev
->bd_disk
->diskseq
);
517 return blkdev_report_zones_ioctl(bdev
, cmd
, arg
);
522 return blkdev_zone_mgmt_ioctl(bdev
, mode
, cmd
, arg
);
524 return put_uint(argp
, bdev_zone_sectors(bdev
));
526 return put_uint(argp
, bdev_nr_zones(bdev
));
528 return put_int(argp
, bdev_read_only(bdev
) != 0);
529 case BLKSSZGET
: /* get block device logical block size */
530 return put_int(argp
, bdev_logical_block_size(bdev
));
531 case BLKPBSZGET
: /* get block device physical block size */
532 return put_uint(argp
, bdev_physical_block_size(bdev
));
534 return put_uint(argp
, bdev_io_min(bdev
));
536 return put_uint(argp
, bdev_io_opt(bdev
));
538 return put_int(argp
, bdev_alignment_offset(bdev
));
539 case BLKDISCARDZEROES
:
540 return put_uint(argp
, 0);
542 max_sectors
= min_t(unsigned int, USHRT_MAX
,
543 queue_max_sectors(bdev_get_queue(bdev
)));
544 return put_ushort(argp
, max_sectors
);
546 return put_ushort(argp
, !bdev_nonrot(bdev
));
549 if(!capable(CAP_SYS_ADMIN
))
551 bdev
->bd_disk
->bdi
->ra_pages
= (arg
* 512) / PAGE_SIZE
;
554 if (!capable(CAP_SYS_ADMIN
))
556 if (bdev_is_partition(bdev
))
558 return disk_scan_partitions(bdev
->bd_disk
, mode
);
561 case BLKTRACETEARDOWN
:
562 return blk_trace_ioctl(bdev
, cmd
, argp
);
563 case IOC_PR_REGISTER
:
564 return blkdev_pr_register(bdev
, mode
, argp
);
566 return blkdev_pr_reserve(bdev
, mode
, argp
);
568 return blkdev_pr_release(bdev
, mode
, argp
);
570 return blkdev_pr_preempt(bdev
, mode
, argp
, false);
571 case IOC_PR_PREEMPT_ABORT
:
572 return blkdev_pr_preempt(bdev
, mode
, argp
, true);
574 return blkdev_pr_clear(bdev
, mode
, argp
);
581 * Always keep this in sync with compat_blkdev_ioctl()
582 * to handle all incompatible commands in both functions.
584 * New commands must be compatible and go into blkdev_common_ioctl
586 long blkdev_ioctl(struct file
*file
, unsigned cmd
, unsigned long arg
)
588 struct block_device
*bdev
= I_BDEV(file
->f_mapping
->host
);
589 void __user
*argp
= (void __user
*)arg
;
590 blk_mode_t mode
= file_to_blk_mode(file
);
594 /* These need separate implementations for the data structure */
596 return blkdev_getgeo(bdev
, argp
);
598 return blkpg_ioctl(bdev
, argp
);
600 /* Compat mode returns 32-bit data instead of 'long' */
605 return put_long(argp
,
606 (bdev
->bd_disk
->bdi
->ra_pages
* PAGE_SIZE
) / 512);
608 if (bdev_nr_sectors(bdev
) > ~0UL)
610 return put_ulong(argp
, bdev_nr_sectors(bdev
));
612 /* The data is compatible, but the command number is different */
613 case BLKBSZGET
: /* get block device soft block size (cf. BLKSSZGET) */
614 return put_int(argp
, block_size(bdev
));
616 return blkdev_bszset(bdev
, mode
, argp
);
618 return put_u64(argp
, bdev_nr_bytes(bdev
));
620 /* Incompatible alignment on i386 */
622 return blk_trace_ioctl(bdev
, cmd
, argp
);
627 ret
= blkdev_common_ioctl(bdev
, mode
, cmd
, arg
, argp
);
628 if (ret
!= -ENOIOCTLCMD
)
631 if (!bdev
->bd_disk
->fops
->ioctl
)
633 return bdev
->bd_disk
->fops
->ioctl(bdev
, mode
, cmd
, arg
);
638 #define BLKBSZGET_32 _IOR(0x12, 112, int)
639 #define BLKBSZSET_32 _IOW(0x12, 113, int)
640 #define BLKGETSIZE64_32 _IOR(0x12, 114, int)
642 /* Most of the generic ioctls are handled in the normal fallback path.
643 This assumes the blkdev's low level compat_ioctl always returns
644 ENOIOCTLCMD for unknown ioctls. */
645 long compat_blkdev_ioctl(struct file
*file
, unsigned cmd
, unsigned long arg
)
648 void __user
*argp
= compat_ptr(arg
);
649 struct block_device
*bdev
= I_BDEV(file
->f_mapping
->host
);
650 struct gendisk
*disk
= bdev
->bd_disk
;
651 blk_mode_t mode
= file_to_blk_mode(file
);
654 /* These need separate implementations for the data structure */
656 return compat_hdio_getgeo(bdev
, argp
);
658 return compat_blkpg_ioctl(bdev
, argp
);
660 /* Compat mode returns 32-bit data instead of 'long' */
665 return compat_put_long(argp
,
666 (bdev
->bd_disk
->bdi
->ra_pages
* PAGE_SIZE
) / 512);
668 if (bdev_nr_sectors(bdev
) > ~(compat_ulong_t
)0)
670 return compat_put_ulong(argp
, bdev_nr_sectors(bdev
));
672 /* The data is compatible, but the command number is different */
673 case BLKBSZGET_32
: /* get the logical block size (cf. BLKSSZGET) */
674 return put_int(argp
, bdev_logical_block_size(bdev
));
676 return blkdev_bszset(bdev
, mode
, argp
);
677 case BLKGETSIZE64_32
:
678 return put_u64(argp
, bdev_nr_bytes(bdev
));
680 /* Incompatible alignment on i386 */
681 case BLKTRACESETUP32
:
682 return blk_trace_ioctl(bdev
, cmd
, argp
);
687 ret
= blkdev_common_ioctl(bdev
, mode
, cmd
, arg
, argp
);
688 if (ret
== -ENOIOCTLCMD
&& disk
->fops
->compat_ioctl
)
689 ret
= disk
->fops
->compat_ioctl(bdev
, mode
, cmd
, arg
);