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 (!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;
46 case BLKPG_ADD_PARTITION:
47 return bdev_add_partition(disk, p.pno, start, length);
48 case BLKPG_RESIZE_PARTITION:
49 return bdev_resize_partition(disk, p.pno, start, length);
55 static int blkpg_ioctl(struct block_device *bdev,
56 struct blkpg_ioctl_arg __user *arg)
58 struct blkpg_partition __user *udata;
61 if (get_user(op, &arg->op) || get_user(udata, &arg->data))
64 return blkpg_do_ioctl(bdev, udata, op);
68 struct compat_blkpg_ioctl_arg {
75 static int compat_blkpg_ioctl(struct block_device *bdev,
76 struct compat_blkpg_ioctl_arg __user *arg)
81 if (get_user(op, &arg->op) || get_user(udata, &arg->data))
84 return blkpg_do_ioctl(bdev, compat_ptr(udata), op);
88 static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode,
92 uint64_t start, len, end;
93 struct inode *inode = bdev->bd_inode;
96 if (!(mode & FMODE_WRITE))
99 if (!bdev_max_discard_sectors(bdev))
102 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
113 if (check_add_overflow(start, len, &end) ||
114 end > bdev_nr_bytes(bdev))
117 filemap_invalidate_lock(inode->i_mapping);
118 err = truncate_bdev_range(bdev, mode, start, start + len - 1);
121 err = blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL);
123 filemap_invalidate_unlock(inode->i_mapping);
127 static int blk_ioctl_secure_erase(struct block_device *bdev, fmode_t mode,
134 if (!(mode & FMODE_WRITE))
136 if (!bdev_max_secure_erase_sectors(bdev))
138 if (copy_from_user(range, argp, sizeof(range)))
143 if ((start & 511) || (len & 511))
145 if (start + len > bdev_nr_bytes(bdev))
148 filemap_invalidate_lock(bdev->bd_inode->i_mapping);
149 err = truncate_bdev_range(bdev, mode, start, start + len - 1);
151 err = blkdev_issue_secure_erase(bdev, start >> 9, len >> 9,
153 filemap_invalidate_unlock(bdev->bd_inode->i_mapping);
158 static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode,
162 uint64_t start, end, len;
163 struct inode *inode = bdev->bd_inode;
166 if (!(mode & FMODE_WRITE))
169 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
174 end = start + len - 1;
180 if (end >= (uint64_t)bdev_nr_bytes(bdev))
185 /* Invalidate the page cache, including dirty pages */
186 filemap_invalidate_lock(inode->i_mapping);
187 err = truncate_bdev_range(bdev, mode, start, end);
191 err = blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL,
192 BLKDEV_ZERO_NOUNMAP);
195 filemap_invalidate_unlock(inode->i_mapping);
199 static int put_ushort(unsigned short __user *argp, unsigned short val)
201 return put_user(val, argp);
204 static int put_int(int __user *argp, int val)
206 return put_user(val, argp);
209 static int put_uint(unsigned int __user *argp, unsigned int val)
211 return put_user(val, argp);
214 static int put_long(long __user *argp, long val)
216 return put_user(val, argp);
219 static int put_ulong(unsigned long __user *argp, unsigned long val)
221 return put_user(val, argp);
224 static int put_u64(u64 __user *argp, u64 val)
226 return put_user(val, argp);
230 static int compat_put_long(compat_long_t __user *argp, long val)
232 return put_user(val, argp);
235 static int compat_put_ulong(compat_ulong_t __user *argp, compat_ulong_t val)
237 return put_user(val, argp);
243 * This is the equivalent of compat_ptr_ioctl(), to be used by block
244 * drivers that implement only commands that are completely compatible
245 * between 32-bit and 64-bit user space
247 int blkdev_compat_ptr_ioctl(struct block_device *bdev, fmode_t mode,
248 unsigned cmd, unsigned long arg)
250 struct gendisk *disk = bdev->bd_disk;
252 if (disk->fops->ioctl)
253 return disk->fops->ioctl(bdev, mode, cmd,
254 (unsigned long)compat_ptr(arg));
258 EXPORT_SYMBOL(blkdev_compat_ptr_ioctl);
261 static int blkdev_pr_register(struct block_device *bdev,
262 struct pr_registration __user *arg)
264 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
265 struct pr_registration reg;
267 if (!capable(CAP_SYS_ADMIN))
269 if (!ops || !ops->pr_register)
271 if (copy_from_user(®, arg, sizeof(reg)))
274 if (reg.flags & ~PR_FL_IGNORE_KEY)
276 return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags);
279 static int blkdev_pr_reserve(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_reserve)
289 if (copy_from_user(&rsv, arg, sizeof(rsv)))
292 if (rsv.flags & ~PR_FL_IGNORE_KEY)
294 return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags);
297 static int blkdev_pr_release(struct block_device *bdev,
298 struct pr_reservation __user *arg)
300 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
301 struct pr_reservation rsv;
303 if (!capable(CAP_SYS_ADMIN))
305 if (!ops || !ops->pr_release)
307 if (copy_from_user(&rsv, arg, sizeof(rsv)))
312 return ops->pr_release(bdev, rsv.key, rsv.type);
315 static int blkdev_pr_preempt(struct block_device *bdev,
316 struct pr_preempt __user *arg, bool abort)
318 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
321 if (!capable(CAP_SYS_ADMIN))
323 if (!ops || !ops->pr_preempt)
325 if (copy_from_user(&p, arg, sizeof(p)))
330 return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort);
333 static int blkdev_pr_clear(struct block_device *bdev,
334 struct pr_clear __user *arg)
336 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
339 if (!capable(CAP_SYS_ADMIN))
341 if (!ops || !ops->pr_clear)
343 if (copy_from_user(&c, arg, sizeof(c)))
348 return ops->pr_clear(bdev, c.key);
351 static int blkdev_flushbuf(struct block_device *bdev, fmode_t mode,
352 unsigned cmd, unsigned long arg)
354 if (!capable(CAP_SYS_ADMIN))
357 invalidate_bdev(bdev);
361 static int blkdev_roset(struct block_device *bdev, fmode_t mode,
362 unsigned cmd, unsigned long arg)
366 if (!capable(CAP_SYS_ADMIN))
369 if (get_user(n, (int __user *)arg))
371 if (bdev->bd_disk->fops->set_read_only) {
372 ret = bdev->bd_disk->fops->set_read_only(bdev, n);
376 bdev->bd_read_only = n;
380 static int blkdev_getgeo(struct block_device *bdev,
381 struct hd_geometry __user *argp)
383 struct gendisk *disk = bdev->bd_disk;
384 struct hd_geometry geo;
389 if (!disk->fops->getgeo)
393 * We need to set the startsect first, the driver may
394 * want to override it.
396 memset(&geo, 0, sizeof(geo));
397 geo.start = get_start_sect(bdev);
398 ret = disk->fops->getgeo(bdev, &geo);
401 if (copy_to_user(argp, &geo, sizeof(geo)))
407 struct compat_hd_geometry {
409 unsigned char sectors;
410 unsigned short cylinders;
414 static int compat_hdio_getgeo(struct block_device *bdev,
415 struct compat_hd_geometry __user *ugeo)
417 struct gendisk *disk = bdev->bd_disk;
418 struct hd_geometry geo;
423 if (!disk->fops->getgeo)
426 memset(&geo, 0, sizeof(geo));
428 * We need to set the startsect first, the driver may
429 * want to override it.
431 geo.start = get_start_sect(bdev);
432 ret = disk->fops->getgeo(bdev, &geo);
436 ret = copy_to_user(ugeo, &geo, 4);
437 ret |= put_user(geo.start, &ugeo->start);
445 /* set the logical block size */
446 static int blkdev_bszset(struct block_device *bdev, fmode_t mode,
451 if (!capable(CAP_SYS_ADMIN))
455 if (get_user(n, argp))
458 if (mode & FMODE_EXCL)
459 return set_blocksize(bdev, n);
461 if (IS_ERR(blkdev_get_by_dev(bdev->bd_dev, mode | FMODE_EXCL, &bdev)))
463 ret = set_blocksize(bdev, n);
464 blkdev_put(bdev, mode | FMODE_EXCL);
470 * Common commands that are handled the same way on native and compat
471 * user space. Note the separate arg/argp parameters that are needed
472 * to deal with the compat_ptr() conversion.
474 static int blkdev_common_ioctl(struct block_device *bdev, fmode_t mode,
475 unsigned int cmd, unsigned long arg,
478 unsigned int max_sectors;
482 return blkdev_flushbuf(bdev, mode, cmd, arg);
484 return blkdev_roset(bdev, mode, cmd, arg);
486 return blk_ioctl_discard(bdev, mode, arg);
488 return blk_ioctl_secure_erase(bdev, mode, argp);
490 return blk_ioctl_zeroout(bdev, mode, arg);
492 return put_u64(argp, bdev->bd_disk->diskseq);
494 return blkdev_report_zones_ioctl(bdev, mode, cmd, arg);
499 return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg);
501 return put_uint(argp, bdev_zone_sectors(bdev));
503 return put_uint(argp, bdev_nr_zones(bdev));
505 return put_int(argp, bdev_read_only(bdev) != 0);
506 case BLKSSZGET: /* get block device logical block size */
507 return put_int(argp, bdev_logical_block_size(bdev));
508 case BLKPBSZGET: /* get block device physical block size */
509 return put_uint(argp, bdev_physical_block_size(bdev));
511 return put_uint(argp, bdev_io_min(bdev));
513 return put_uint(argp, bdev_io_opt(bdev));
515 return put_int(argp, bdev_alignment_offset(bdev));
516 case BLKDISCARDZEROES:
517 return put_uint(argp, 0);
519 max_sectors = min_t(unsigned int, USHRT_MAX,
520 queue_max_sectors(bdev_get_queue(bdev)));
521 return put_ushort(argp, max_sectors);
523 return put_ushort(argp, !bdev_nonrot(bdev));
526 if(!capable(CAP_SYS_ADMIN))
528 bdev->bd_disk->bdi->ra_pages = (arg * 512) / PAGE_SIZE;
531 if (!capable(CAP_SYS_ADMIN))
533 if (bdev_is_partition(bdev))
535 return disk_scan_partitions(bdev->bd_disk, mode);
538 case BLKTRACETEARDOWN:
539 return blk_trace_ioctl(bdev, cmd, argp);
540 case IOC_PR_REGISTER:
541 return blkdev_pr_register(bdev, argp);
543 return blkdev_pr_reserve(bdev, argp);
545 return blkdev_pr_release(bdev, argp);
547 return blkdev_pr_preempt(bdev, argp, false);
548 case IOC_PR_PREEMPT_ABORT:
549 return blkdev_pr_preempt(bdev, argp, true);
551 return blkdev_pr_clear(bdev, argp);
558 * Always keep this in sync with compat_blkdev_ioctl()
559 * to handle all incompatible commands in both functions.
561 * New commands must be compatible and go into blkdev_common_ioctl
563 long blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
565 struct block_device *bdev = I_BDEV(file->f_mapping->host);
566 void __user *argp = (void __user *)arg;
567 fmode_t mode = file->f_mode;
571 * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
572 * to updated it before every ioctl.
574 if (file->f_flags & O_NDELAY)
575 mode |= FMODE_NDELAY;
577 mode &= ~FMODE_NDELAY;
580 /* These need separate implementations for the data structure */
582 return blkdev_getgeo(bdev, argp);
584 return blkpg_ioctl(bdev, argp);
586 /* Compat mode returns 32-bit data instead of 'long' */
591 return put_long(argp,
592 (bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512);
594 if (bdev_nr_sectors(bdev) > ~0UL)
596 return put_ulong(argp, bdev_nr_sectors(bdev));
598 /* The data is compatible, but the command number is different */
599 case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
600 return put_int(argp, block_size(bdev));
602 return blkdev_bszset(bdev, mode, argp);
604 return put_u64(argp, bdev_nr_bytes(bdev));
606 /* Incompatible alignment on i386 */
608 return blk_trace_ioctl(bdev, cmd, argp);
613 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
614 if (ret != -ENOIOCTLCMD)
617 if (!bdev->bd_disk->fops->ioctl)
619 return bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg);
624 #define BLKBSZGET_32 _IOR(0x12, 112, int)
625 #define BLKBSZSET_32 _IOW(0x12, 113, int)
626 #define BLKGETSIZE64_32 _IOR(0x12, 114, int)
628 /* Most of the generic ioctls are handled in the normal fallback path.
629 This assumes the blkdev's low level compat_ioctl always returns
630 ENOIOCTLCMD for unknown ioctls. */
631 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
634 void __user *argp = compat_ptr(arg);
635 struct block_device *bdev = I_BDEV(file->f_mapping->host);
636 struct gendisk *disk = bdev->bd_disk;
637 fmode_t mode = file->f_mode;
640 * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
641 * to updated it before every ioctl.
643 if (file->f_flags & O_NDELAY)
644 mode |= FMODE_NDELAY;
646 mode &= ~FMODE_NDELAY;
649 /* These need separate implementations for the data structure */
651 return compat_hdio_getgeo(bdev, argp);
653 return compat_blkpg_ioctl(bdev, argp);
655 /* Compat mode returns 32-bit data instead of 'long' */
660 return compat_put_long(argp,
661 (bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512);
663 if (bdev_nr_sectors(bdev) > ~(compat_ulong_t)0)
665 return compat_put_ulong(argp, bdev_nr_sectors(bdev));
667 /* The data is compatible, but the command number is different */
668 case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
669 return put_int(argp, bdev_logical_block_size(bdev));
671 return blkdev_bszset(bdev, mode, argp);
672 case BLKGETSIZE64_32:
673 return put_u64(argp, bdev_nr_bytes(bdev));
675 /* Incompatible alignment on i386 */
676 case BLKTRACESETUP32:
677 return blk_trace_ioctl(bdev, cmd, argp);
682 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
683 if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
684 ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);