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);
237 * This is the equivalent of compat_ptr_ioctl(), to be used by block
238 * drivers that implement only commands that are completely compatible
239 * between 32-bit and 64-bit user space
241 int blkdev_compat_ptr_ioctl(struct block_device *bdev, fmode_t mode,
242 unsigned cmd, unsigned long arg)
244 struct gendisk *disk = bdev->bd_disk;
246 if (disk->fops->ioctl)
247 return disk->fops->ioctl(bdev, mode, cmd,
248 (unsigned long)compat_ptr(arg));
252 EXPORT_SYMBOL(blkdev_compat_ptr_ioctl);
255 static int blkdev_pr_register(struct block_device *bdev,
256 struct pr_registration __user *arg)
258 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
259 struct pr_registration reg;
261 if (!capable(CAP_SYS_ADMIN))
263 if (!ops || !ops->pr_register)
265 if (copy_from_user(®, arg, sizeof(reg)))
268 if (reg.flags & ~PR_FL_IGNORE_KEY)
270 return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags);
273 static int blkdev_pr_reserve(struct block_device *bdev,
274 struct pr_reservation __user *arg)
276 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
277 struct pr_reservation rsv;
279 if (!capable(CAP_SYS_ADMIN))
281 if (!ops || !ops->pr_reserve)
283 if (copy_from_user(&rsv, arg, sizeof(rsv)))
286 if (rsv.flags & ~PR_FL_IGNORE_KEY)
288 return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags);
291 static int blkdev_pr_release(struct block_device *bdev,
292 struct pr_reservation __user *arg)
294 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
295 struct pr_reservation rsv;
297 if (!capable(CAP_SYS_ADMIN))
299 if (!ops || !ops->pr_release)
301 if (copy_from_user(&rsv, arg, sizeof(rsv)))
306 return ops->pr_release(bdev, rsv.key, rsv.type);
309 static int blkdev_pr_preempt(struct block_device *bdev,
310 struct pr_preempt __user *arg, bool abort)
312 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
315 if (!capable(CAP_SYS_ADMIN))
317 if (!ops || !ops->pr_preempt)
319 if (copy_from_user(&p, arg, sizeof(p)))
324 return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort);
327 static int blkdev_pr_clear(struct block_device *bdev,
328 struct pr_clear __user *arg)
330 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
333 if (!capable(CAP_SYS_ADMIN))
335 if (!ops || !ops->pr_clear)
337 if (copy_from_user(&c, arg, sizeof(c)))
342 return ops->pr_clear(bdev, c.key);
345 static int blkdev_flushbuf(struct block_device *bdev, fmode_t mode,
346 unsigned cmd, unsigned long arg)
348 if (!capable(CAP_SYS_ADMIN))
351 invalidate_bdev(bdev);
355 static int blkdev_roset(struct block_device *bdev, fmode_t mode,
356 unsigned cmd, unsigned long arg)
360 if (!capable(CAP_SYS_ADMIN))
363 if (get_user(n, (int __user *)arg))
365 if (bdev->bd_disk->fops->set_read_only) {
366 ret = bdev->bd_disk->fops->set_read_only(bdev, n);
370 bdev->bd_read_only = n;
374 static int blkdev_getgeo(struct block_device *bdev,
375 struct hd_geometry __user *argp)
377 struct gendisk *disk = bdev->bd_disk;
378 struct hd_geometry geo;
383 if (!disk->fops->getgeo)
387 * We need to set the startsect first, the driver may
388 * want to override it.
390 memset(&geo, 0, sizeof(geo));
391 geo.start = get_start_sect(bdev);
392 ret = disk->fops->getgeo(bdev, &geo);
395 if (copy_to_user(argp, &geo, sizeof(geo)))
401 struct compat_hd_geometry {
403 unsigned char sectors;
404 unsigned short cylinders;
408 static int compat_hdio_getgeo(struct block_device *bdev,
409 struct compat_hd_geometry __user *ugeo)
411 struct gendisk *disk = bdev->bd_disk;
412 struct hd_geometry geo;
417 if (!disk->fops->getgeo)
420 memset(&geo, 0, sizeof(geo));
422 * We need to set the startsect first, the driver may
423 * want to override it.
425 geo.start = get_start_sect(bdev);
426 ret = disk->fops->getgeo(bdev, &geo);
430 ret = copy_to_user(ugeo, &geo, 4);
431 ret |= put_user(geo.start, &ugeo->start);
439 /* set the logical block size */
440 static int blkdev_bszset(struct block_device *bdev, fmode_t mode,
445 if (!capable(CAP_SYS_ADMIN))
449 if (get_user(n, argp))
452 if (mode & FMODE_EXCL)
453 return set_blocksize(bdev, n);
455 if (IS_ERR(blkdev_get_by_dev(bdev->bd_dev, mode | FMODE_EXCL, &bdev)))
457 ret = set_blocksize(bdev, n);
458 blkdev_put(bdev, mode | FMODE_EXCL);
464 * Common commands that are handled the same way on native and compat
465 * user space. Note the separate arg/argp parameters that are needed
466 * to deal with the compat_ptr() conversion.
468 static int blkdev_common_ioctl(struct block_device *bdev, fmode_t mode,
469 unsigned cmd, unsigned long arg, void __user *argp)
471 unsigned int max_sectors;
475 return blkdev_flushbuf(bdev, mode, cmd, arg);
477 return blkdev_roset(bdev, mode, cmd, arg);
479 return blk_ioctl_discard(bdev, mode, arg, 0);
481 return blk_ioctl_discard(bdev, mode, arg,
482 BLKDEV_DISCARD_SECURE);
484 return blk_ioctl_zeroout(bdev, mode, arg);
486 return put_u64(argp, bdev->bd_disk->diskseq);
488 return blkdev_report_zones_ioctl(bdev, mode, cmd, arg);
493 return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg);
495 return put_uint(argp, bdev_zone_sectors(bdev));
497 return put_uint(argp, blkdev_nr_zones(bdev->bd_disk));
499 return put_int(argp, bdev_read_only(bdev) != 0);
500 case BLKSSZGET: /* get block device logical block size */
501 return put_int(argp, bdev_logical_block_size(bdev));
502 case BLKPBSZGET: /* get block device physical block size */
503 return put_uint(argp, bdev_physical_block_size(bdev));
505 return put_uint(argp, bdev_io_min(bdev));
507 return put_uint(argp, bdev_io_opt(bdev));
509 return put_int(argp, bdev_alignment_offset(bdev));
510 case BLKDISCARDZEROES:
511 return put_uint(argp, 0);
513 max_sectors = min_t(unsigned int, USHRT_MAX,
514 queue_max_sectors(bdev_get_queue(bdev)));
515 return put_ushort(argp, max_sectors);
517 return put_ushort(argp, !blk_queue_nonrot(bdev_get_queue(bdev)));
520 if(!capable(CAP_SYS_ADMIN))
522 bdev->bd_disk->bdi->ra_pages = (arg * 512) / PAGE_SIZE;
525 return blkdev_reread_part(bdev, mode);
528 case BLKTRACETEARDOWN:
529 return blk_trace_ioctl(bdev, cmd, argp);
530 case IOC_PR_REGISTER:
531 return blkdev_pr_register(bdev, argp);
533 return blkdev_pr_reserve(bdev, argp);
535 return blkdev_pr_release(bdev, argp);
537 return blkdev_pr_preempt(bdev, argp, false);
538 case IOC_PR_PREEMPT_ABORT:
539 return blkdev_pr_preempt(bdev, argp, true);
541 return blkdev_pr_clear(bdev, argp);
548 * Always keep this in sync with compat_blkdev_ioctl()
549 * to handle all incompatible commands in both functions.
551 * New commands must be compatible and go into blkdev_common_ioctl
553 int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
558 void __user *argp = (void __user *)arg;
561 /* These need separate implementations for the data structure */
563 return blkdev_getgeo(bdev, argp);
565 return blkpg_ioctl(bdev, argp);
567 /* Compat mode returns 32-bit data instead of 'long' */
572 return put_long(argp,
573 (bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512);
575 size = i_size_read(bdev->bd_inode);
576 if ((size >> 9) > ~0UL)
578 return put_ulong(argp, size >> 9);
580 /* The data is compatible, but the command number is different */
581 case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
582 return put_int(argp, block_size(bdev));
584 return blkdev_bszset(bdev, mode, argp);
586 return put_u64(argp, i_size_read(bdev->bd_inode));
588 /* Incompatible alignment on i386 */
590 return blk_trace_ioctl(bdev, cmd, argp);
595 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
596 if (ret != -ENOIOCTLCMD)
599 if (!bdev->bd_disk->fops->ioctl)
601 return bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg);
603 EXPORT_SYMBOL_GPL(blkdev_ioctl); /* for /dev/raw */
607 #define BLKBSZGET_32 _IOR(0x12, 112, int)
608 #define BLKBSZSET_32 _IOW(0x12, 113, int)
609 #define BLKGETSIZE64_32 _IOR(0x12, 114, int)
611 /* Most of the generic ioctls are handled in the normal fallback path.
612 This assumes the blkdev's low level compat_ioctl always returns
613 ENOIOCTLCMD for unknown ioctls. */
614 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
617 void __user *argp = compat_ptr(arg);
618 struct block_device *bdev = I_BDEV(file->f_mapping->host);
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_disk->bdi->ra_pages * PAGE_SIZE) / 512);
647 size = i_size_read(bdev->bd_inode);
648 if ((size >> 9) > ~(compat_ulong_t)0)
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);