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, capacity, end;
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 if (p.start < 0 || p.length <= 0 || p.start + p.length < 0)
38 /* Check that the partition is aligned to the block size */
39 if (!IS_ALIGNED(p.start | p.length, bdev_logical_block_size(bdev)))
42 start = p.start >> SECTOR_SHIFT;
43 length = p.length >> SECTOR_SHIFT;
44 capacity = get_capacity(disk);
46 if (check_add_overflow(start, length, &end))
49 if (start >= capacity || end > capacity)
53 case BLKPG_ADD_PARTITION:
54 return bdev_add_partition(disk, p.pno, start, length);
55 case BLKPG_RESIZE_PARTITION:
56 return bdev_resize_partition(disk, p.pno, start, length);
62 static int blkpg_ioctl(struct block_device *bdev,
63 struct blkpg_ioctl_arg __user *arg)
65 struct blkpg_partition __user *udata;
68 if (get_user(op, &arg->op) || get_user(udata, &arg->data))
71 return blkpg_do_ioctl(bdev, udata, op);
75 struct compat_blkpg_ioctl_arg {
82 static int compat_blkpg_ioctl(struct block_device *bdev,
83 struct compat_blkpg_ioctl_arg __user *arg)
88 if (get_user(op, &arg->op) || get_user(udata, &arg->data))
91 return blkpg_do_ioctl(bdev, compat_ptr(udata), op);
95 static int blk_ioctl_discard(struct block_device *bdev, blk_mode_t mode,
99 uint64_t start, len, end;
100 struct inode *inode = bdev->bd_inode;
103 if (!(mode & BLK_OPEN_WRITE))
106 if (!bdev_max_discard_sectors(bdev))
109 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
120 if (check_add_overflow(start, len, &end) ||
121 end > bdev_nr_bytes(bdev))
124 filemap_invalidate_lock(inode->i_mapping);
125 err = truncate_bdev_range(bdev, mode, start, start + len - 1);
128 err = blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL);
130 filemap_invalidate_unlock(inode->i_mapping);
134 static int blk_ioctl_secure_erase(struct block_device *bdev, blk_mode_t mode,
141 if (!(mode & BLK_OPEN_WRITE))
143 if (!bdev_max_secure_erase_sectors(bdev))
145 if (copy_from_user(range, argp, sizeof(range)))
150 if ((start & 511) || (len & 511))
152 if (start + len > bdev_nr_bytes(bdev))
155 filemap_invalidate_lock(bdev->bd_inode->i_mapping);
156 err = truncate_bdev_range(bdev, mode, start, start + len - 1);
158 err = blkdev_issue_secure_erase(bdev, start >> 9, len >> 9,
160 filemap_invalidate_unlock(bdev->bd_inode->i_mapping);
165 static int blk_ioctl_zeroout(struct block_device *bdev, blk_mode_t mode,
169 uint64_t start, end, len;
170 struct inode *inode = bdev->bd_inode;
173 if (!(mode & BLK_OPEN_WRITE))
176 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
181 end = start + len - 1;
187 if (end >= (uint64_t)bdev_nr_bytes(bdev))
192 /* Invalidate the page cache, including dirty pages */
193 filemap_invalidate_lock(inode->i_mapping);
194 err = truncate_bdev_range(bdev, mode, start, end);
198 err = blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL,
199 BLKDEV_ZERO_NOUNMAP);
202 filemap_invalidate_unlock(inode->i_mapping);
206 static int put_ushort(unsigned short __user *argp, unsigned short val)
208 return put_user(val, argp);
211 static int put_int(int __user *argp, int val)
213 return put_user(val, argp);
216 static int put_uint(unsigned int __user *argp, unsigned int val)
218 return put_user(val, argp);
221 static int put_long(long __user *argp, long val)
223 return put_user(val, argp);
226 static int put_ulong(unsigned long __user *argp, unsigned long val)
228 return put_user(val, argp);
231 static int put_u64(u64 __user *argp, u64 val)
233 return put_user(val, argp);
237 static int compat_put_long(compat_long_t __user *argp, long val)
239 return put_user(val, argp);
242 static int compat_put_ulong(compat_ulong_t __user *argp, compat_ulong_t val)
244 return put_user(val, argp);
250 * This is the equivalent of compat_ptr_ioctl(), to be used by block
251 * drivers that implement only commands that are completely compatible
252 * between 32-bit and 64-bit user space
254 int blkdev_compat_ptr_ioctl(struct block_device *bdev, blk_mode_t mode,
255 unsigned cmd, unsigned long arg)
257 struct gendisk *disk = bdev->bd_disk;
259 if (disk->fops->ioctl)
260 return disk->fops->ioctl(bdev, mode, cmd,
261 (unsigned long)compat_ptr(arg));
265 EXPORT_SYMBOL(blkdev_compat_ptr_ioctl);
268 static bool blkdev_pr_allowed(struct block_device *bdev, blk_mode_t mode)
270 /* no sense to make reservations for partitions */
271 if (bdev_is_partition(bdev))
274 if (capable(CAP_SYS_ADMIN))
277 * Only allow unprivileged reservations if the file descriptor is open
280 return mode & BLK_OPEN_WRITE;
283 static int blkdev_pr_register(struct block_device *bdev, blk_mode_t mode,
284 struct pr_registration __user *arg)
286 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
287 struct pr_registration reg;
289 if (!blkdev_pr_allowed(bdev, mode))
291 if (!ops || !ops->pr_register)
293 if (copy_from_user(®, arg, sizeof(reg)))
296 if (reg.flags & ~PR_FL_IGNORE_KEY)
298 return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags);
301 static int blkdev_pr_reserve(struct block_device *bdev, blk_mode_t mode,
302 struct pr_reservation __user *arg)
304 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
305 struct pr_reservation rsv;
307 if (!blkdev_pr_allowed(bdev, mode))
309 if (!ops || !ops->pr_reserve)
311 if (copy_from_user(&rsv, arg, sizeof(rsv)))
314 if (rsv.flags & ~PR_FL_IGNORE_KEY)
316 return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags);
319 static int blkdev_pr_release(struct block_device *bdev, blk_mode_t mode,
320 struct pr_reservation __user *arg)
322 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
323 struct pr_reservation rsv;
325 if (!blkdev_pr_allowed(bdev, mode))
327 if (!ops || !ops->pr_release)
329 if (copy_from_user(&rsv, arg, sizeof(rsv)))
334 return ops->pr_release(bdev, rsv.key, rsv.type);
337 static int blkdev_pr_preempt(struct block_device *bdev, blk_mode_t mode,
338 struct pr_preempt __user *arg, bool abort)
340 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
343 if (!blkdev_pr_allowed(bdev, mode))
345 if (!ops || !ops->pr_preempt)
347 if (copy_from_user(&p, arg, sizeof(p)))
352 return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort);
355 static int blkdev_pr_clear(struct block_device *bdev, blk_mode_t mode,
356 struct pr_clear __user *arg)
358 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
361 if (!blkdev_pr_allowed(bdev, mode))
363 if (!ops || !ops->pr_clear)
365 if (copy_from_user(&c, arg, sizeof(c)))
370 return ops->pr_clear(bdev, c.key);
373 static int blkdev_flushbuf(struct block_device *bdev, unsigned cmd,
376 if (!capable(CAP_SYS_ADMIN))
379 mutex_lock(&bdev->bd_holder_lock);
380 if (bdev->bd_holder_ops && bdev->bd_holder_ops->sync)
381 bdev->bd_holder_ops->sync(bdev);
383 mutex_unlock(&bdev->bd_holder_lock);
387 invalidate_bdev(bdev);
391 static int blkdev_roset(struct block_device *bdev, unsigned cmd,
396 if (!capable(CAP_SYS_ADMIN))
399 if (get_user(n, (int __user *)arg))
401 if (bdev->bd_disk->fops->set_read_only) {
402 ret = bdev->bd_disk->fops->set_read_only(bdev, n);
406 bdev->bd_read_only = n;
410 static int blkdev_getgeo(struct block_device *bdev,
411 struct hd_geometry __user *argp)
413 struct gendisk *disk = bdev->bd_disk;
414 struct hd_geometry geo;
419 if (!disk->fops->getgeo)
423 * We need to set the startsect first, the driver may
424 * want to override it.
426 memset(&geo, 0, sizeof(geo));
427 geo.start = get_start_sect(bdev);
428 ret = disk->fops->getgeo(bdev, &geo);
431 if (copy_to_user(argp, &geo, sizeof(geo)))
437 struct compat_hd_geometry {
439 unsigned char sectors;
440 unsigned short cylinders;
444 static int compat_hdio_getgeo(struct block_device *bdev,
445 struct compat_hd_geometry __user *ugeo)
447 struct gendisk *disk = bdev->bd_disk;
448 struct hd_geometry geo;
453 if (!disk->fops->getgeo)
456 memset(&geo, 0, sizeof(geo));
458 * We need to set the startsect first, the driver may
459 * want to override it.
461 geo.start = get_start_sect(bdev);
462 ret = disk->fops->getgeo(bdev, &geo);
466 ret = copy_to_user(ugeo, &geo, 4);
467 ret |= put_user(geo.start, &ugeo->start);
475 /* set the logical block size */
476 static int blkdev_bszset(struct block_device *bdev, blk_mode_t mode,
482 if (!capable(CAP_SYS_ADMIN))
486 if (get_user(n, argp))
489 if (mode & BLK_OPEN_EXCL)
490 return set_blocksize(bdev, n);
492 file = bdev_file_open_by_dev(bdev->bd_dev, mode, &bdev, NULL);
495 ret = set_blocksize(bdev, n);
501 * Common commands that are handled the same way on native and compat
502 * user space. Note the separate arg/argp parameters that are needed
503 * to deal with the compat_ptr() conversion.
505 static int blkdev_common_ioctl(struct block_device *bdev, blk_mode_t mode,
506 unsigned int cmd, unsigned long arg,
509 unsigned int max_sectors;
513 return blkdev_flushbuf(bdev, cmd, arg);
515 return blkdev_roset(bdev, cmd, arg);
517 return blk_ioctl_discard(bdev, mode, arg);
519 return blk_ioctl_secure_erase(bdev, mode, argp);
521 return blk_ioctl_zeroout(bdev, mode, arg);
523 return put_u64(argp, bdev->bd_disk->diskseq);
525 return blkdev_report_zones_ioctl(bdev, cmd, arg);
530 return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg);
532 return put_uint(argp, bdev_zone_sectors(bdev));
534 return put_uint(argp, bdev_nr_zones(bdev));
536 return put_int(argp, bdev_read_only(bdev) != 0);
537 case BLKSSZGET: /* get block device logical block size */
538 return put_int(argp, bdev_logical_block_size(bdev));
539 case BLKPBSZGET: /* get block device physical block size */
540 return put_uint(argp, bdev_physical_block_size(bdev));
542 return put_uint(argp, bdev_io_min(bdev));
544 return put_uint(argp, bdev_io_opt(bdev));
546 return put_int(argp, bdev_alignment_offset(bdev));
547 case BLKDISCARDZEROES:
548 return put_uint(argp, 0);
550 max_sectors = min_t(unsigned int, USHRT_MAX,
551 queue_max_sectors(bdev_get_queue(bdev)));
552 return put_ushort(argp, max_sectors);
554 return put_ushort(argp, !bdev_nonrot(bdev));
557 if(!capable(CAP_SYS_ADMIN))
559 bdev->bd_disk->bdi->ra_pages = (arg * 512) / PAGE_SIZE;
562 if (!capable(CAP_SYS_ADMIN))
564 if (bdev_is_partition(bdev))
566 return disk_scan_partitions(bdev->bd_disk,
567 mode | BLK_OPEN_STRICT_SCAN);
570 case BLKTRACETEARDOWN:
571 return blk_trace_ioctl(bdev, cmd, argp);
572 case IOC_PR_REGISTER:
573 return blkdev_pr_register(bdev, mode, argp);
575 return blkdev_pr_reserve(bdev, mode, argp);
577 return blkdev_pr_release(bdev, mode, argp);
579 return blkdev_pr_preempt(bdev, mode, argp, false);
580 case IOC_PR_PREEMPT_ABORT:
581 return blkdev_pr_preempt(bdev, mode, argp, true);
583 return blkdev_pr_clear(bdev, mode, argp);
590 * Always keep this in sync with compat_blkdev_ioctl()
591 * to handle all incompatible commands in both functions.
593 * New commands must be compatible and go into blkdev_common_ioctl
595 long blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
597 struct block_device *bdev = I_BDEV(file->f_mapping->host);
598 void __user *argp = (void __user *)arg;
599 blk_mode_t mode = file_to_blk_mode(file);
603 /* These need separate implementations for the data structure */
605 return blkdev_getgeo(bdev, argp);
607 return blkpg_ioctl(bdev, argp);
609 /* Compat mode returns 32-bit data instead of 'long' */
614 return put_long(argp,
615 (bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512);
617 if (bdev_nr_sectors(bdev) > ~0UL)
619 return put_ulong(argp, bdev_nr_sectors(bdev));
621 /* The data is compatible, but the command number is different */
622 case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
623 return put_int(argp, block_size(bdev));
625 return blkdev_bszset(bdev, mode, argp);
627 return put_u64(argp, bdev_nr_bytes(bdev));
629 /* Incompatible alignment on i386 */
631 return blk_trace_ioctl(bdev, cmd, argp);
636 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
637 if (ret != -ENOIOCTLCMD)
640 if (!bdev->bd_disk->fops->ioctl)
642 return bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg);
647 #define BLKBSZGET_32 _IOR(0x12, 112, int)
648 #define BLKBSZSET_32 _IOW(0x12, 113, int)
649 #define BLKGETSIZE64_32 _IOR(0x12, 114, int)
651 /* Most of the generic ioctls are handled in the normal fallback path.
652 This assumes the blkdev's low level compat_ioctl always returns
653 ENOIOCTLCMD for unknown ioctls. */
654 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
657 void __user *argp = compat_ptr(arg);
658 struct block_device *bdev = I_BDEV(file->f_mapping->host);
659 struct gendisk *disk = bdev->bd_disk;
660 blk_mode_t mode = file_to_blk_mode(file);
663 /* These need separate implementations for the data structure */
665 return compat_hdio_getgeo(bdev, argp);
667 return compat_blkpg_ioctl(bdev, argp);
669 /* Compat mode returns 32-bit data instead of 'long' */
674 return compat_put_long(argp,
675 (bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512);
677 if (bdev_nr_sectors(bdev) > ~(compat_ulong_t)0)
679 return compat_put_ulong(argp, bdev_nr_sectors(bdev));
681 /* The data is compatible, but the command number is different */
682 case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
683 return put_int(argp, bdev_logical_block_size(bdev));
685 return blkdev_bszset(bdev, mode, argp);
686 case BLKGETSIZE64_32:
687 return put_u64(argp, bdev_nr_bytes(bdev));
689 /* Incompatible alignment on i386 */
690 case BLKTRACESETUP32:
691 return blk_trace_ioctl(bdev, cmd, argp);
696 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
697 if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
698 ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);