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 sector_t 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 if (p.start < 0 || p.length <= 0 || p.start + p.length < 0)
40 /* Check that the partition is aligned to the block size */
41 if (!IS_ALIGNED(p.start | p.length, bdev_logical_block_size(bdev)))
44 start = p.start >> SECTOR_SHIFT;
45 length = p.length >> SECTOR_SHIFT;
48 case BLKPG_ADD_PARTITION:
49 return bdev_add_partition(disk, p.pno, start, length);
50 case BLKPG_RESIZE_PARTITION:
51 return bdev_resize_partition(disk, p.pno, start, length);
57 static int blkpg_ioctl(struct block_device *bdev,
58 struct blkpg_ioctl_arg __user *arg)
60 struct blkpg_partition __user *udata;
63 if (get_user(op, &arg->op) || get_user(udata, &arg->data))
66 return blkpg_do_ioctl(bdev, udata, op);
70 struct compat_blkpg_ioctl_arg {
77 static int compat_blkpg_ioctl(struct block_device *bdev,
78 struct compat_blkpg_ioctl_arg __user *arg)
83 if (get_user(op, &arg->op) || get_user(udata, &arg->data))
86 return blkpg_do_ioctl(bdev, compat_ptr(udata), op);
90 static int blk_ioctl_discard(struct block_device *bdev, blk_mode_t mode,
95 struct inode *inode = bdev->bd_inode;
98 if (!(mode & BLK_OPEN_WRITE))
101 if (!bdev_max_discard_sectors(bdev))
104 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
115 if (start + len > bdev_nr_bytes(bdev))
118 filemap_invalidate_lock(inode->i_mapping);
119 err = truncate_bdev_range(bdev, mode, start, start + len - 1);
122 err = blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL);
124 filemap_invalidate_unlock(inode->i_mapping);
128 static int blk_ioctl_secure_erase(struct block_device *bdev, blk_mode_t mode,
135 if (!(mode & BLK_OPEN_WRITE))
137 if (!bdev_max_secure_erase_sectors(bdev))
139 if (copy_from_user(range, argp, sizeof(range)))
144 if ((start & 511) || (len & 511))
146 if (start + len > bdev_nr_bytes(bdev))
149 filemap_invalidate_lock(bdev->bd_inode->i_mapping);
150 err = truncate_bdev_range(bdev, mode, start, start + len - 1);
152 err = blkdev_issue_secure_erase(bdev, start >> 9, len >> 9,
154 filemap_invalidate_unlock(bdev->bd_inode->i_mapping);
159 static int blk_ioctl_zeroout(struct block_device *bdev, blk_mode_t mode,
163 uint64_t start, end, len;
164 struct inode *inode = bdev->bd_inode;
167 if (!(mode & BLK_OPEN_WRITE))
170 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
175 end = start + len - 1;
181 if (end >= (uint64_t)bdev_nr_bytes(bdev))
186 /* Invalidate the page cache, including dirty pages */
187 filemap_invalidate_lock(inode->i_mapping);
188 err = truncate_bdev_range(bdev, mode, start, end);
192 err = blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL,
193 BLKDEV_ZERO_NOUNMAP);
196 filemap_invalidate_unlock(inode->i_mapping);
200 static int put_ushort(unsigned short __user *argp, unsigned short val)
202 return put_user(val, argp);
205 static int put_int(int __user *argp, int val)
207 return put_user(val, argp);
210 static int put_uint(unsigned int __user *argp, unsigned int val)
212 return put_user(val, argp);
215 static int put_long(long __user *argp, long val)
217 return put_user(val, argp);
220 static int put_ulong(unsigned long __user *argp, unsigned long val)
222 return put_user(val, argp);
225 static int put_u64(u64 __user *argp, u64 val)
227 return put_user(val, argp);
231 static int compat_put_long(compat_long_t __user *argp, long val)
233 return put_user(val, argp);
236 static int compat_put_ulong(compat_ulong_t __user *argp, compat_ulong_t val)
238 return put_user(val, argp);
244 * This is the equivalent of compat_ptr_ioctl(), to be used by block
245 * drivers that implement only commands that are completely compatible
246 * between 32-bit and 64-bit user space
248 int blkdev_compat_ptr_ioctl(struct block_device *bdev, blk_mode_t mode,
249 unsigned cmd, unsigned long arg)
251 struct gendisk *disk = bdev->bd_disk;
253 if (disk->fops->ioctl)
254 return disk->fops->ioctl(bdev, mode, cmd,
255 (unsigned long)compat_ptr(arg));
259 EXPORT_SYMBOL(blkdev_compat_ptr_ioctl);
262 static bool blkdev_pr_allowed(struct block_device *bdev, blk_mode_t mode)
264 /* no sense to make reservations for partitions */
265 if (bdev_is_partition(bdev))
268 if (capable(CAP_SYS_ADMIN))
271 * Only allow unprivileged reservations if the file descriptor is open
274 return mode & BLK_OPEN_WRITE;
277 static int blkdev_pr_register(struct block_device *bdev, blk_mode_t mode,
278 struct pr_registration __user *arg)
280 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
281 struct pr_registration reg;
283 if (!blkdev_pr_allowed(bdev, mode))
285 if (!ops || !ops->pr_register)
287 if (copy_from_user(®, arg, sizeof(reg)))
290 if (reg.flags & ~PR_FL_IGNORE_KEY)
292 return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags);
295 static int blkdev_pr_reserve(struct block_device *bdev, blk_mode_t mode,
296 struct pr_reservation __user *arg)
298 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
299 struct pr_reservation rsv;
301 if (!blkdev_pr_allowed(bdev, mode))
303 if (!ops || !ops->pr_reserve)
305 if (copy_from_user(&rsv, arg, sizeof(rsv)))
308 if (rsv.flags & ~PR_FL_IGNORE_KEY)
310 return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags);
313 static int blkdev_pr_release(struct block_device *bdev, blk_mode_t mode,
314 struct pr_reservation __user *arg)
316 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
317 struct pr_reservation rsv;
319 if (!blkdev_pr_allowed(bdev, mode))
321 if (!ops || !ops->pr_release)
323 if (copy_from_user(&rsv, arg, sizeof(rsv)))
328 return ops->pr_release(bdev, rsv.key, rsv.type);
331 static int blkdev_pr_preempt(struct block_device *bdev, blk_mode_t mode,
332 struct pr_preempt __user *arg, bool abort)
334 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
337 if (!blkdev_pr_allowed(bdev, mode))
339 if (!ops || !ops->pr_preempt)
341 if (copy_from_user(&p, arg, sizeof(p)))
346 return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort);
349 static int blkdev_pr_clear(struct block_device *bdev, blk_mode_t mode,
350 struct pr_clear __user *arg)
352 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
355 if (!blkdev_pr_allowed(bdev, mode))
357 if (!ops || !ops->pr_clear)
359 if (copy_from_user(&c, arg, sizeof(c)))
364 return ops->pr_clear(bdev, c.key);
367 static int blkdev_flushbuf(struct block_device *bdev, unsigned cmd,
370 if (!capable(CAP_SYS_ADMIN))
373 mutex_lock(&bdev->bd_holder_lock);
374 if (bdev->bd_holder_ops && bdev->bd_holder_ops->sync)
375 bdev->bd_holder_ops->sync(bdev);
378 mutex_unlock(&bdev->bd_holder_lock);
380 invalidate_bdev(bdev);
384 static int blkdev_roset(struct block_device *bdev, unsigned cmd,
389 if (!capable(CAP_SYS_ADMIN))
392 if (get_user(n, (int __user *)arg))
394 if (bdev->bd_disk->fops->set_read_only) {
395 ret = bdev->bd_disk->fops->set_read_only(bdev, n);
399 bdev->bd_read_only = n;
403 static int blkdev_getgeo(struct block_device *bdev,
404 struct hd_geometry __user *argp)
406 struct gendisk *disk = bdev->bd_disk;
407 struct hd_geometry geo;
412 if (!disk->fops->getgeo)
416 * We need to set the startsect first, the driver may
417 * want to override it.
419 memset(&geo, 0, sizeof(geo));
420 geo.start = get_start_sect(bdev);
421 ret = disk->fops->getgeo(bdev, &geo);
424 if (copy_to_user(argp, &geo, sizeof(geo)))
430 struct compat_hd_geometry {
432 unsigned char sectors;
433 unsigned short cylinders;
437 static int compat_hdio_getgeo(struct block_device *bdev,
438 struct compat_hd_geometry __user *ugeo)
440 struct gendisk *disk = bdev->bd_disk;
441 struct hd_geometry geo;
446 if (!disk->fops->getgeo)
449 memset(&geo, 0, sizeof(geo));
451 * We need to set the startsect first, the driver may
452 * want to override it.
454 geo.start = get_start_sect(bdev);
455 ret = disk->fops->getgeo(bdev, &geo);
459 ret = copy_to_user(ugeo, &geo, 4);
460 ret |= put_user(geo.start, &ugeo->start);
468 /* set the logical block size */
469 static int blkdev_bszset(struct block_device *bdev, blk_mode_t mode,
474 if (!capable(CAP_SYS_ADMIN))
478 if (get_user(n, argp))
481 if (mode & BLK_OPEN_EXCL)
482 return set_blocksize(bdev, n);
484 if (IS_ERR(blkdev_get_by_dev(bdev->bd_dev, mode, &bdev, NULL)))
486 ret = set_blocksize(bdev, n);
487 blkdev_put(bdev, &bdev);
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);