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 (!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 start = p.start >> SECTOR_SHIFT;
37 length = p.length >> SECTOR_SHIFT;
40 case BLKPG_ADD_PARTITION:
41 /* check if partition is aligned to blocksize */
42 if (p.start & (bdev_logical_block_size(bdev) - 1))
44 return bdev_add_partition(disk, p.pno, start, length);
45 case BLKPG_RESIZE_PARTITION:
46 return bdev_resize_partition(disk, p.pno, start, length);
52 static int blkpg_ioctl(struct block_device *bdev,
53 struct blkpg_ioctl_arg __user *arg)
55 struct blkpg_partition __user *udata;
58 if (get_user(op, &arg->op) || get_user(udata, &arg->data))
61 return blkpg_do_ioctl(bdev, udata, op);
65 struct compat_blkpg_ioctl_arg {
72 static int compat_blkpg_ioctl(struct block_device *bdev,
73 struct compat_blkpg_ioctl_arg __user *arg)
78 if (get_user(op, &arg->op) || get_user(udata, &arg->data))
81 return blkpg_do_ioctl(bdev, compat_ptr(udata), op);
85 static int blkdev_reread_part(struct block_device *bdev, fmode_t mode)
87 struct block_device *tmp;
89 if (!disk_part_scan_enabled(bdev->bd_disk) || bdev_is_partition(bdev))
91 if (!capable(CAP_SYS_ADMIN))
93 if (bdev->bd_disk->open_partitions)
97 * Reopen the device to revalidate the driver state and force a
101 set_bit(GD_NEED_PART_SCAN, &bdev->bd_disk->state);
103 tmp = blkdev_get_by_dev(bdev->bd_dev, mode, NULL);
106 blkdev_put(tmp, mode);
110 static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode,
111 unsigned long arg, unsigned long flags)
115 struct request_queue *q = bdev_get_queue(bdev);
116 struct inode *inode = bdev->bd_inode;
119 if (!(mode & FMODE_WRITE))
122 if (!blk_queue_discard(q))
125 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
136 if (start + len > i_size_read(bdev->bd_inode))
139 filemap_invalidate_lock(inode->i_mapping);
140 err = truncate_bdev_range(bdev, mode, start, start + len - 1);
144 err = blkdev_issue_discard(bdev, start >> 9, len >> 9,
148 filemap_invalidate_unlock(inode->i_mapping);
152 static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode,
156 uint64_t start, end, len;
157 struct inode *inode = bdev->bd_inode;
160 if (!(mode & FMODE_WRITE))
163 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
168 end = start + len - 1;
174 if (end >= (uint64_t)i_size_read(bdev->bd_inode))
179 /* Invalidate the page cache, including dirty pages */
180 filemap_invalidate_lock(inode->i_mapping);
181 err = truncate_bdev_range(bdev, mode, start, end);
185 err = blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL,
186 BLKDEV_ZERO_NOUNMAP);
189 filemap_invalidate_unlock(inode->i_mapping);
193 static int put_ushort(unsigned short __user *argp, unsigned short val)
195 return put_user(val, argp);
198 static int put_int(int __user *argp, int val)
200 return put_user(val, argp);
203 static int put_uint(unsigned int __user *argp, unsigned int val)
205 return put_user(val, argp);
208 static int put_long(long __user *argp, long val)
210 return put_user(val, argp);
213 static int put_ulong(unsigned long __user *argp, unsigned long val)
215 return put_user(val, argp);
218 static int put_u64(u64 __user *argp, u64 val)
220 return put_user(val, argp);
224 static int compat_put_long(compat_long_t __user *argp, long val)
226 return put_user(val, argp);
229 static int compat_put_ulong(compat_ulong_t __user *argp, compat_ulong_t val)
231 return put_user(val, argp);
235 int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
236 unsigned cmd, unsigned long arg)
238 struct gendisk *disk = bdev->bd_disk;
240 if (disk->fops->ioctl)
241 return disk->fops->ioctl(bdev, mode, cmd, arg);
246 * For the record: _GPL here is only because somebody decided to slap it
247 * on the previous export. Sheer idiocy, since it wasn't copyrightable
248 * at all and could be open-coded without any exports by anybody who cares.
250 EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl);
254 * This is the equivalent of compat_ptr_ioctl(), to be used by block
255 * drivers that implement only commands that are completely compatible
256 * between 32-bit and 64-bit user space
258 int blkdev_compat_ptr_ioctl(struct block_device *bdev, fmode_t mode,
259 unsigned cmd, unsigned long arg)
261 struct gendisk *disk = bdev->bd_disk;
263 if (disk->fops->ioctl)
264 return disk->fops->ioctl(bdev, mode, cmd,
265 (unsigned long)compat_ptr(arg));
269 EXPORT_SYMBOL(blkdev_compat_ptr_ioctl);
272 static int blkdev_pr_register(struct block_device *bdev,
273 struct pr_registration __user *arg)
275 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
276 struct pr_registration reg;
278 if (!capable(CAP_SYS_ADMIN))
280 if (!ops || !ops->pr_register)
282 if (copy_from_user(®, arg, sizeof(reg)))
285 if (reg.flags & ~PR_FL_IGNORE_KEY)
287 return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags);
290 static int blkdev_pr_reserve(struct block_device *bdev,
291 struct pr_reservation __user *arg)
293 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
294 struct pr_reservation rsv;
296 if (!capable(CAP_SYS_ADMIN))
298 if (!ops || !ops->pr_reserve)
300 if (copy_from_user(&rsv, arg, sizeof(rsv)))
303 if (rsv.flags & ~PR_FL_IGNORE_KEY)
305 return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags);
308 static int blkdev_pr_release(struct block_device *bdev,
309 struct pr_reservation __user *arg)
311 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
312 struct pr_reservation rsv;
314 if (!capable(CAP_SYS_ADMIN))
316 if (!ops || !ops->pr_release)
318 if (copy_from_user(&rsv, arg, sizeof(rsv)))
323 return ops->pr_release(bdev, rsv.key, rsv.type);
326 static int blkdev_pr_preempt(struct block_device *bdev,
327 struct pr_preempt __user *arg, bool abort)
329 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
332 if (!capable(CAP_SYS_ADMIN))
334 if (!ops || !ops->pr_preempt)
336 if (copy_from_user(&p, arg, sizeof(p)))
341 return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort);
344 static int blkdev_pr_clear(struct block_device *bdev,
345 struct pr_clear __user *arg)
347 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
350 if (!capable(CAP_SYS_ADMIN))
352 if (!ops || !ops->pr_clear)
354 if (copy_from_user(&c, arg, sizeof(c)))
359 return ops->pr_clear(bdev, c.key);
363 * Is it an unrecognized ioctl? The correct returns are either
364 * ENOTTY (final) or ENOIOCTLCMD ("I don't know this one, try a
365 * fallback"). ENOIOCTLCMD gets turned into ENOTTY by the ioctl
366 * code before returning.
368 * Confused drivers sometimes return EINVAL, which is wrong. It
369 * means "I understood the ioctl command, but the parameters to
372 * We should aim to just fix the broken drivers, the EINVAL case
375 static inline int is_unrecognized_ioctl(int ret)
377 return ret == -EINVAL ||
382 static int blkdev_flushbuf(struct block_device *bdev, fmode_t mode,
383 unsigned cmd, unsigned long arg)
385 if (!capable(CAP_SYS_ADMIN))
388 invalidate_bdev(bdev);
392 static int blkdev_roset(struct block_device *bdev, fmode_t mode,
393 unsigned cmd, unsigned long arg)
397 if (!capable(CAP_SYS_ADMIN))
400 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
401 if (!is_unrecognized_ioctl(ret))
403 if (get_user(n, (int __user *)arg))
405 if (bdev->bd_disk->fops->set_read_only) {
406 ret = bdev->bd_disk->fops->set_read_only(bdev, n);
410 bdev->bd_read_only = n;
414 static int blkdev_getgeo(struct block_device *bdev,
415 struct hd_geometry __user *argp)
417 struct gendisk *disk = bdev->bd_disk;
418 struct hd_geometry geo;
423 if (!disk->fops->getgeo)
427 * We need to set the startsect first, the driver may
428 * want to override it.
430 memset(&geo, 0, sizeof(geo));
431 geo.start = get_start_sect(bdev);
432 ret = disk->fops->getgeo(bdev, &geo);
435 if (copy_to_user(argp, &geo, sizeof(geo)))
441 struct compat_hd_geometry {
443 unsigned char sectors;
444 unsigned short cylinders;
448 static int compat_hdio_getgeo(struct block_device *bdev,
449 struct compat_hd_geometry __user *ugeo)
451 struct gendisk *disk = bdev->bd_disk;
452 struct hd_geometry geo;
457 if (!disk->fops->getgeo)
460 memset(&geo, 0, sizeof(geo));
462 * We need to set the startsect first, the driver may
463 * want to override it.
465 geo.start = get_start_sect(bdev);
466 ret = disk->fops->getgeo(bdev, &geo);
470 ret = copy_to_user(ugeo, &geo, 4);
471 ret |= put_user(geo.start, &ugeo->start);
479 /* set the logical block size */
480 static int blkdev_bszset(struct block_device *bdev, fmode_t mode,
485 if (!capable(CAP_SYS_ADMIN))
489 if (get_user(n, argp))
492 if (mode & FMODE_EXCL)
493 return set_blocksize(bdev, n);
495 if (IS_ERR(blkdev_get_by_dev(bdev->bd_dev, mode | FMODE_EXCL, &bdev)))
497 ret = set_blocksize(bdev, n);
498 blkdev_put(bdev, mode | FMODE_EXCL);
504 * Common commands that are handled the same way on native and compat
505 * user space. Note the separate arg/argp parameters that are needed
506 * to deal with the compat_ptr() conversion.
508 static int blkdev_common_ioctl(struct block_device *bdev, fmode_t mode,
509 unsigned cmd, unsigned long arg, void __user *argp)
511 unsigned int max_sectors;
515 return blkdev_flushbuf(bdev, mode, cmd, arg);
517 return blkdev_roset(bdev, mode, cmd, arg);
519 return blk_ioctl_discard(bdev, mode, arg, 0);
521 return blk_ioctl_discard(bdev, mode, arg,
522 BLKDEV_DISCARD_SECURE);
524 return blk_ioctl_zeroout(bdev, mode, arg);
526 return put_u64(argp, bdev->bd_disk->diskseq);
528 return blkdev_report_zones_ioctl(bdev, mode, cmd, arg);
533 return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg);
535 return put_uint(argp, bdev_zone_sectors(bdev));
537 return put_uint(argp, blkdev_nr_zones(bdev->bd_disk));
539 return put_int(argp, bdev_read_only(bdev) != 0);
540 case BLKSSZGET: /* get block device logical block size */
541 return put_int(argp, bdev_logical_block_size(bdev));
542 case BLKPBSZGET: /* get block device physical block size */
543 return put_uint(argp, bdev_physical_block_size(bdev));
545 return put_uint(argp, bdev_io_min(bdev));
547 return put_uint(argp, bdev_io_opt(bdev));
549 return put_int(argp, bdev_alignment_offset(bdev));
550 case BLKDISCARDZEROES:
551 return put_uint(argp, 0);
553 max_sectors = min_t(unsigned int, USHRT_MAX,
554 queue_max_sectors(bdev_get_queue(bdev)));
555 return put_ushort(argp, max_sectors);
557 return put_ushort(argp, !blk_queue_nonrot(bdev_get_queue(bdev)));
560 if(!capable(CAP_SYS_ADMIN))
562 bdev->bd_disk->bdi->ra_pages = (arg * 512) / PAGE_SIZE;
565 return blkdev_reread_part(bdev, mode);
568 case BLKTRACETEARDOWN:
569 return blk_trace_ioctl(bdev, cmd, argp);
570 case IOC_PR_REGISTER:
571 return blkdev_pr_register(bdev, argp);
573 return blkdev_pr_reserve(bdev, argp);
575 return blkdev_pr_release(bdev, argp);
577 return blkdev_pr_preempt(bdev, argp, false);
578 case IOC_PR_PREEMPT_ABORT:
579 return blkdev_pr_preempt(bdev, argp, true);
581 return blkdev_pr_clear(bdev, argp);
588 * Always keep this in sync with compat_blkdev_ioctl()
589 * to handle all incompatible commands in both functions.
591 * New commands must be compatible and go into blkdev_common_ioctl
593 int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
598 void __user *argp = (void __user *)arg;
601 /* These need separate implementations for the data structure */
603 return blkdev_getgeo(bdev, argp);
605 return blkpg_ioctl(bdev, argp);
607 /* Compat mode returns 32-bit data instead of 'long' */
612 return put_long(argp,
613 (bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512);
615 size = i_size_read(bdev->bd_inode);
616 if ((size >> 9) > ~0UL)
618 return put_ulong(argp, size >> 9);
620 /* The data is compatible, but the command number is different */
621 case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
622 return put_int(argp, block_size(bdev));
624 return blkdev_bszset(bdev, mode, argp);
626 return put_u64(argp, i_size_read(bdev->bd_inode));
628 /* Incompatible alignment on i386 */
630 return blk_trace_ioctl(bdev, cmd, argp);
635 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
636 if (ret == -ENOIOCTLCMD)
637 return __blkdev_driver_ioctl(bdev, mode, cmd, arg);
641 EXPORT_SYMBOL_GPL(blkdev_ioctl); /* for /dev/raw */
645 #define BLKBSZGET_32 _IOR(0x12, 112, int)
646 #define BLKBSZSET_32 _IOW(0x12, 113, int)
647 #define BLKGETSIZE64_32 _IOR(0x12, 114, int)
649 /* Most of the generic ioctls are handled in the normal fallback path.
650 This assumes the blkdev's low level compat_ioctl always returns
651 ENOIOCTLCMD for unknown ioctls. */
652 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
655 void __user *argp = compat_ptr(arg);
656 struct block_device *bdev = I_BDEV(file->f_mapping->host);
657 struct gendisk *disk = bdev->bd_disk;
658 fmode_t mode = file->f_mode;
662 * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
663 * to updated it before every ioctl.
665 if (file->f_flags & O_NDELAY)
666 mode |= FMODE_NDELAY;
668 mode &= ~FMODE_NDELAY;
671 /* These need separate implementations for the data structure */
673 return compat_hdio_getgeo(bdev, argp);
675 return compat_blkpg_ioctl(bdev, argp);
677 /* Compat mode returns 32-bit data instead of 'long' */
682 return compat_put_long(argp,
683 (bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512);
685 size = i_size_read(bdev->bd_inode);
686 if ((size >> 9) > ~(compat_ulong_t)0)
688 return compat_put_ulong(argp, size >> 9);
690 /* The data is compatible, but the command number is different */
691 case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
692 return put_int(argp, bdev_logical_block_size(bdev));
694 return blkdev_bszset(bdev, mode, argp);
695 case BLKGETSIZE64_32:
696 return put_u64(argp, i_size_read(bdev->bd_inode));
698 /* Incompatible alignment on i386 */
699 case BLKTRACESETUP32:
700 return blk_trace_ioctl(bdev, cmd, argp);
705 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
706 if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
707 ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);