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 blkpg_partition p;
20 long long start, length;
22 if (!capable(CAP_SYS_ADMIN))
24 if (copy_from_user(&p, upart, sizeof(struct blkpg_partition)))
26 if (bdev_is_partition(bdev))
32 if (op == BLKPG_DEL_PARTITION)
33 return bdev_del_partition(bdev, p.pno);
35 start = p.start >> SECTOR_SHIFT;
36 length = p.length >> SECTOR_SHIFT;
38 /* check for fit in a hd_struct */
39 if (sizeof(sector_t) < sizeof(long long)) {
40 long pstart = start, plength = length;
42 if (pstart != start || plength != length || pstart < 0 ||
43 plength < 0 || p.pno > 65535)
48 case BLKPG_ADD_PARTITION:
49 /* check if partition is aligned to blocksize */
50 if (p.start & (bdev_logical_block_size(bdev) - 1))
52 return bdev_add_partition(bdev, p.pno, start, length);
53 case BLKPG_RESIZE_PARTITION:
54 return bdev_resize_partition(bdev, p.pno, start, length);
60 static int blkpg_ioctl(struct block_device *bdev,
61 struct blkpg_ioctl_arg __user *arg)
63 struct blkpg_partition __user *udata;
66 if (get_user(op, &arg->op) || get_user(udata, &arg->data))
69 return blkpg_do_ioctl(bdev, udata, op);
73 struct compat_blkpg_ioctl_arg {
80 static int compat_blkpg_ioctl(struct block_device *bdev,
81 struct compat_blkpg_ioctl_arg __user *arg)
86 if (get_user(op, &arg->op) || get_user(udata, &arg->data))
89 return blkpg_do_ioctl(bdev, compat_ptr(udata), op);
93 static int blkdev_reread_part(struct block_device *bdev)
97 if (!disk_part_scan_enabled(bdev->bd_disk) || bdev_is_partition(bdev))
99 if (!capable(CAP_SYS_ADMIN))
102 mutex_lock(&bdev->bd_mutex);
103 ret = bdev_disk_changed(bdev, false);
104 mutex_unlock(&bdev->bd_mutex);
109 static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode,
110 unsigned long arg, unsigned long flags)
114 struct request_queue *q = bdev_get_queue(bdev);
117 if (!(mode & FMODE_WRITE))
120 if (!blk_queue_discard(q))
123 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
134 if (start + len > i_size_read(bdev->bd_inode))
137 err = truncate_bdev_range(bdev, mode, start, start + len - 1);
141 return blkdev_issue_discard(bdev, start >> 9, len >> 9,
145 static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode,
149 uint64_t start, end, len;
152 if (!(mode & FMODE_WRITE))
155 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
160 end = start + len - 1;
166 if (end >= (uint64_t)i_size_read(bdev->bd_inode))
171 /* Invalidate the page cache, including dirty pages */
172 err = truncate_bdev_range(bdev, mode, start, end);
176 return blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL,
177 BLKDEV_ZERO_NOUNMAP);
180 static int put_ushort(unsigned short __user *argp, unsigned short val)
182 return put_user(val, argp);
185 static int put_int(int __user *argp, int val)
187 return put_user(val, argp);
190 static int put_uint(unsigned int __user *argp, unsigned int val)
192 return put_user(val, argp);
195 static int put_long(long __user *argp, long val)
197 return put_user(val, argp);
200 static int put_ulong(unsigned long __user *argp, unsigned long val)
202 return put_user(val, argp);
205 static int put_u64(u64 __user *argp, u64 val)
207 return put_user(val, argp);
211 static int compat_put_long(compat_long_t __user *argp, long val)
213 return put_user(val, argp);
216 static int compat_put_ulong(compat_ulong_t __user *argp, compat_ulong_t val)
218 return put_user(val, argp);
222 int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
223 unsigned cmd, unsigned long arg)
225 struct gendisk *disk = bdev->bd_disk;
227 if (disk->fops->ioctl)
228 return disk->fops->ioctl(bdev, mode, cmd, arg);
233 * For the record: _GPL here is only because somebody decided to slap it
234 * on the previous export. Sheer idiocy, since it wasn't copyrightable
235 * at all and could be open-coded without any exports by anybody who cares.
237 EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl);
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, fmode_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 int blkdev_pr_register(struct block_device *bdev,
260 struct pr_registration __user *arg)
262 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
263 struct pr_registration reg;
265 if (!capable(CAP_SYS_ADMIN))
267 if (!ops || !ops->pr_register)
269 if (copy_from_user(®, arg, sizeof(reg)))
272 if (reg.flags & ~PR_FL_IGNORE_KEY)
274 return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags);
277 static int blkdev_pr_reserve(struct block_device *bdev,
278 struct pr_reservation __user *arg)
280 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
281 struct pr_reservation rsv;
283 if (!capable(CAP_SYS_ADMIN))
285 if (!ops || !ops->pr_reserve)
287 if (copy_from_user(&rsv, arg, sizeof(rsv)))
290 if (rsv.flags & ~PR_FL_IGNORE_KEY)
292 return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags);
295 static int blkdev_pr_release(struct block_device *bdev,
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 (!capable(CAP_SYS_ADMIN))
303 if (!ops || !ops->pr_release)
305 if (copy_from_user(&rsv, arg, sizeof(rsv)))
310 return ops->pr_release(bdev, rsv.key, rsv.type);
313 static int blkdev_pr_preempt(struct block_device *bdev,
314 struct pr_preempt __user *arg, bool abort)
316 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
319 if (!capable(CAP_SYS_ADMIN))
321 if (!ops || !ops->pr_preempt)
323 if (copy_from_user(&p, arg, sizeof(p)))
328 return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort);
331 static int blkdev_pr_clear(struct block_device *bdev,
332 struct pr_clear __user *arg)
334 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
337 if (!capable(CAP_SYS_ADMIN))
339 if (!ops || !ops->pr_clear)
341 if (copy_from_user(&c, arg, sizeof(c)))
346 return ops->pr_clear(bdev, c.key);
349 static int blkdev_flushbuf(struct block_device *bdev, fmode_t mode,
350 unsigned cmd, unsigned long arg)
352 if (!capable(CAP_SYS_ADMIN))
355 invalidate_bdev(bdev);
359 static int blkdev_roset(struct block_device *bdev, fmode_t mode,
360 unsigned cmd, unsigned long arg)
364 if (!capable(CAP_SYS_ADMIN))
367 if (get_user(n, (int __user *)arg))
369 if (bdev->bd_disk->fops->set_read_only) {
370 ret = bdev->bd_disk->fops->set_read_only(bdev, n);
374 set_device_ro(bdev, n);
378 static int blkdev_getgeo(struct block_device *bdev,
379 struct hd_geometry __user *argp)
381 struct gendisk *disk = bdev->bd_disk;
382 struct hd_geometry geo;
387 if (!disk->fops->getgeo)
391 * We need to set the startsect first, the driver may
392 * want to override it.
394 memset(&geo, 0, sizeof(geo));
395 geo.start = get_start_sect(bdev);
396 ret = disk->fops->getgeo(bdev, &geo);
399 if (copy_to_user(argp, &geo, sizeof(geo)))
405 struct compat_hd_geometry {
407 unsigned char sectors;
408 unsigned short cylinders;
412 static int compat_hdio_getgeo(struct block_device *bdev,
413 struct compat_hd_geometry __user *ugeo)
415 struct gendisk *disk = bdev->bd_disk;
416 struct hd_geometry geo;
421 if (!disk->fops->getgeo)
424 memset(&geo, 0, sizeof(geo));
426 * We need to set the startsect first, the driver may
427 * want to override it.
429 geo.start = get_start_sect(bdev);
430 ret = disk->fops->getgeo(bdev, &geo);
434 ret = copy_to_user(ugeo, &geo, 4);
435 ret |= put_user(geo.start, &ugeo->start);
443 /* set the logical block size */
444 static int blkdev_bszset(struct block_device *bdev, fmode_t mode,
449 if (!capable(CAP_SYS_ADMIN))
453 if (get_user(n, argp))
456 if (mode & FMODE_EXCL)
457 return set_blocksize(bdev, n);
459 if (IS_ERR(blkdev_get_by_dev(bdev->bd_dev, mode | FMODE_EXCL, &bdev)))
461 ret = set_blocksize(bdev, n);
462 blkdev_put(bdev, mode | FMODE_EXCL);
468 * Common commands that are handled the same way on native and compat
469 * user space. Note the separate arg/argp parameters that are needed
470 * to deal with the compat_ptr() conversion.
472 static int blkdev_common_ioctl(struct block_device *bdev, fmode_t mode,
473 unsigned cmd, unsigned long arg, void __user *argp)
475 unsigned int max_sectors;
479 return blkdev_flushbuf(bdev, mode, cmd, arg);
481 return blkdev_roset(bdev, mode, cmd, arg);
483 return blk_ioctl_discard(bdev, mode, arg, 0);
485 return blk_ioctl_discard(bdev, mode, arg,
486 BLKDEV_DISCARD_SECURE);
488 return blk_ioctl_zeroout(bdev, mode, arg);
490 return blkdev_report_zones_ioctl(bdev, mode, cmd, arg);
495 return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg);
497 return put_uint(argp, bdev_zone_sectors(bdev));
499 return put_uint(argp, blkdev_nr_zones(bdev->bd_disk));
501 return put_int(argp, bdev_read_only(bdev) != 0);
502 case BLKSSZGET: /* get block device logical block size */
503 return put_int(argp, bdev_logical_block_size(bdev));
504 case BLKPBSZGET: /* get block device physical block size */
505 return put_uint(argp, bdev_physical_block_size(bdev));
507 return put_uint(argp, bdev_io_min(bdev));
509 return put_uint(argp, bdev_io_opt(bdev));
511 return put_int(argp, bdev_alignment_offset(bdev));
512 case BLKDISCARDZEROES:
513 return put_uint(argp, 0);
515 max_sectors = min_t(unsigned int, USHRT_MAX,
516 queue_max_sectors(bdev_get_queue(bdev)));
517 return put_ushort(argp, max_sectors);
519 return put_ushort(argp, !blk_queue_nonrot(bdev_get_queue(bdev)));
522 if(!capable(CAP_SYS_ADMIN))
524 bdev->bd_bdi->ra_pages = (arg * 512) / PAGE_SIZE;
527 return blkdev_reread_part(bdev);
530 case BLKTRACETEARDOWN:
531 return blk_trace_ioctl(bdev, cmd, argp);
532 case IOC_PR_REGISTER:
533 return blkdev_pr_register(bdev, argp);
535 return blkdev_pr_reserve(bdev, argp);
537 return blkdev_pr_release(bdev, argp);
539 return blkdev_pr_preempt(bdev, argp, false);
540 case IOC_PR_PREEMPT_ABORT:
541 return blkdev_pr_preempt(bdev, argp, true);
543 return blkdev_pr_clear(bdev, argp);
550 * Always keep this in sync with compat_blkdev_ioctl()
551 * to handle all incompatible commands in both functions.
553 * New commands must be compatible and go into blkdev_common_ioctl
555 int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
560 void __user *argp = (void __user *)arg;
563 /* These need separate implementations for the data structure */
565 return blkdev_getgeo(bdev, argp);
567 return blkpg_ioctl(bdev, argp);
569 /* Compat mode returns 32-bit data instead of 'long' */
574 return put_long(argp, (bdev->bd_bdi->ra_pages*PAGE_SIZE) / 512);
576 size = i_size_read(bdev->bd_inode);
577 if ((size >> 9) > ~0UL)
579 return put_ulong(argp, size >> 9);
581 /* The data is compatible, but the command number is different */
582 case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
583 return put_int(argp, block_size(bdev));
585 return blkdev_bszset(bdev, mode, argp);
587 return put_u64(argp, i_size_read(bdev->bd_inode));
589 /* Incompatible alignment on i386 */
591 return blk_trace_ioctl(bdev, cmd, argp);
596 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
597 if (ret == -ENOIOCTLCMD)
598 return __blkdev_driver_ioctl(bdev, mode, cmd, arg);
602 EXPORT_SYMBOL_GPL(blkdev_ioctl); /* for /dev/raw */
606 #define BLKBSZGET_32 _IOR(0x12, 112, int)
607 #define BLKBSZSET_32 _IOW(0x12, 113, int)
608 #define BLKGETSIZE64_32 _IOR(0x12, 114, int)
610 /* Most of the generic ioctls are handled in the normal fallback path.
611 This assumes the blkdev's low level compat_ioctl always returns
612 ENOIOCTLCMD for unknown ioctls. */
613 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
616 void __user *argp = compat_ptr(arg);
617 struct inode *inode = file->f_mapping->host;
618 struct block_device *bdev = inode->i_bdev;
619 struct gendisk *disk = bdev->bd_disk;
620 fmode_t mode = file->f_mode;
624 * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
625 * to updated it before every ioctl.
627 if (file->f_flags & O_NDELAY)
628 mode |= FMODE_NDELAY;
630 mode &= ~FMODE_NDELAY;
633 /* These need separate implementations for the data structure */
635 return compat_hdio_getgeo(bdev, argp);
637 return compat_blkpg_ioctl(bdev, argp);
639 /* Compat mode returns 32-bit data instead of 'long' */
644 return compat_put_long(argp,
645 (bdev->bd_bdi->ra_pages * PAGE_SIZE) / 512);
647 size = i_size_read(bdev->bd_inode);
648 if ((size >> 9) > ~0UL)
650 return compat_put_ulong(argp, size >> 9);
652 /* The data is compatible, but the command number is different */
653 case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
654 return put_int(argp, bdev_logical_block_size(bdev));
656 return blkdev_bszset(bdev, mode, argp);
657 case BLKGETSIZE64_32:
658 return put_u64(argp, i_size_read(bdev->bd_inode));
660 /* Incompatible alignment on i386 */
661 case BLKTRACESETUP32:
662 return blk_trace_ioctl(bdev, cmd, argp);
667 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
668 if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
669 ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);