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;
39 case BLKPG_ADD_PARTITION:
40 /* check if partition is aligned to blocksize */
41 if (p.start & (bdev_logical_block_size(bdev) - 1))
43 return bdev_add_partition(bdev, p.pno, start, length);
44 case BLKPG_RESIZE_PARTITION:
45 return bdev_resize_partition(bdev, p.pno, start, length);
51 static int blkpg_ioctl(struct block_device *bdev,
52 struct blkpg_ioctl_arg __user *arg)
54 struct blkpg_partition __user *udata;
57 if (get_user(op, &arg->op) || get_user(udata, &arg->data))
60 return blkpg_do_ioctl(bdev, udata, op);
64 struct compat_blkpg_ioctl_arg {
71 static int compat_blkpg_ioctl(struct block_device *bdev,
72 struct compat_blkpg_ioctl_arg __user *arg)
77 if (get_user(op, &arg->op) || get_user(udata, &arg->data))
80 return blkpg_do_ioctl(bdev, compat_ptr(udata), op);
84 static int blkdev_reread_part(struct block_device *bdev, fmode_t mode)
86 struct block_device *tmp;
88 if (!disk_part_scan_enabled(bdev->bd_disk) || bdev_is_partition(bdev))
90 if (!capable(CAP_SYS_ADMIN))
94 * Reopen the device to revalidate the driver state and force a
98 set_bit(GD_NEED_PART_SCAN, &bdev->bd_disk->state);
100 tmp = blkdev_get_by_dev(bdev->bd_dev, mode, NULL);
103 blkdev_put(tmp, mode);
107 static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode,
108 unsigned long arg, unsigned long flags)
112 struct request_queue *q = bdev_get_queue(bdev);
115 if (!(mode & FMODE_WRITE))
118 if (!blk_queue_discard(q))
121 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
132 if (start + len > i_size_read(bdev->bd_inode))
135 err = truncate_bdev_range(bdev, mode, start, start + len - 1);
139 return blkdev_issue_discard(bdev, start >> 9, len >> 9,
143 static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode,
147 uint64_t start, end, len;
150 if (!(mode & FMODE_WRITE))
153 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
158 end = start + len - 1;
164 if (end >= (uint64_t)i_size_read(bdev->bd_inode))
169 /* Invalidate the page cache, including dirty pages */
170 err = truncate_bdev_range(bdev, mode, start, end);
174 return blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL,
175 BLKDEV_ZERO_NOUNMAP);
178 static int put_ushort(unsigned short __user *argp, unsigned short val)
180 return put_user(val, argp);
183 static int put_int(int __user *argp, int val)
185 return put_user(val, argp);
188 static int put_uint(unsigned int __user *argp, unsigned int val)
190 return put_user(val, argp);
193 static int put_long(long __user *argp, long val)
195 return put_user(val, argp);
198 static int put_ulong(unsigned long __user *argp, unsigned long val)
200 return put_user(val, argp);
203 static int put_u64(u64 __user *argp, u64 val)
205 return put_user(val, argp);
209 static int compat_put_long(compat_long_t __user *argp, long val)
211 return put_user(val, argp);
214 static int compat_put_ulong(compat_ulong_t __user *argp, compat_ulong_t val)
216 return put_user(val, argp);
222 * This is the equivalent of compat_ptr_ioctl(), to be used by block
223 * drivers that implement only commands that are completely compatible
224 * between 32-bit and 64-bit user space
226 int blkdev_compat_ptr_ioctl(struct block_device *bdev, fmode_t mode,
227 unsigned cmd, unsigned long arg)
229 struct gendisk *disk = bdev->bd_disk;
231 if (disk->fops->ioctl)
232 return disk->fops->ioctl(bdev, mode, cmd,
233 (unsigned long)compat_ptr(arg));
237 EXPORT_SYMBOL(blkdev_compat_ptr_ioctl);
240 static int blkdev_pr_register(struct block_device *bdev,
241 struct pr_registration __user *arg)
243 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
244 struct pr_registration reg;
246 if (!capable(CAP_SYS_ADMIN))
248 if (!ops || !ops->pr_register)
250 if (copy_from_user(®, arg, sizeof(reg)))
253 if (reg.flags & ~PR_FL_IGNORE_KEY)
255 return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags);
258 static int blkdev_pr_reserve(struct block_device *bdev,
259 struct pr_reservation __user *arg)
261 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
262 struct pr_reservation rsv;
264 if (!capable(CAP_SYS_ADMIN))
266 if (!ops || !ops->pr_reserve)
268 if (copy_from_user(&rsv, arg, sizeof(rsv)))
271 if (rsv.flags & ~PR_FL_IGNORE_KEY)
273 return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags);
276 static int blkdev_pr_release(struct block_device *bdev,
277 struct pr_reservation __user *arg)
279 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
280 struct pr_reservation rsv;
282 if (!capable(CAP_SYS_ADMIN))
284 if (!ops || !ops->pr_release)
286 if (copy_from_user(&rsv, arg, sizeof(rsv)))
291 return ops->pr_release(bdev, rsv.key, rsv.type);
294 static int blkdev_pr_preempt(struct block_device *bdev,
295 struct pr_preempt __user *arg, bool abort)
297 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
300 if (!capable(CAP_SYS_ADMIN))
302 if (!ops || !ops->pr_preempt)
304 if (copy_from_user(&p, arg, sizeof(p)))
309 return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort);
312 static int blkdev_pr_clear(struct block_device *bdev,
313 struct pr_clear __user *arg)
315 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
318 if (!capable(CAP_SYS_ADMIN))
320 if (!ops || !ops->pr_clear)
322 if (copy_from_user(&c, arg, sizeof(c)))
327 return ops->pr_clear(bdev, c.key);
330 static int blkdev_flushbuf(struct block_device *bdev, fmode_t mode,
331 unsigned cmd, unsigned long arg)
333 if (!capable(CAP_SYS_ADMIN))
336 invalidate_bdev(bdev);
340 static int blkdev_roset(struct block_device *bdev, fmode_t mode,
341 unsigned cmd, unsigned long arg)
345 if (!capable(CAP_SYS_ADMIN))
348 if (get_user(n, (int __user *)arg))
350 if (bdev->bd_disk->fops->set_read_only) {
351 ret = bdev->bd_disk->fops->set_read_only(bdev, n);
355 bdev->bd_read_only = n;
359 static int blkdev_getgeo(struct block_device *bdev,
360 struct hd_geometry __user *argp)
362 struct gendisk *disk = bdev->bd_disk;
363 struct hd_geometry geo;
368 if (!disk->fops->getgeo)
372 * We need to set the startsect first, the driver may
373 * want to override it.
375 memset(&geo, 0, sizeof(geo));
376 geo.start = get_start_sect(bdev);
377 ret = disk->fops->getgeo(bdev, &geo);
380 if (copy_to_user(argp, &geo, sizeof(geo)))
386 struct compat_hd_geometry {
388 unsigned char sectors;
389 unsigned short cylinders;
393 static int compat_hdio_getgeo(struct block_device *bdev,
394 struct compat_hd_geometry __user *ugeo)
396 struct gendisk *disk = bdev->bd_disk;
397 struct hd_geometry geo;
402 if (!disk->fops->getgeo)
405 memset(&geo, 0, sizeof(geo));
407 * We need to set the startsect first, the driver may
408 * want to override it.
410 geo.start = get_start_sect(bdev);
411 ret = disk->fops->getgeo(bdev, &geo);
415 ret = copy_to_user(ugeo, &geo, 4);
416 ret |= put_user(geo.start, &ugeo->start);
424 /* set the logical block size */
425 static int blkdev_bszset(struct block_device *bdev, fmode_t mode,
430 if (!capable(CAP_SYS_ADMIN))
434 if (get_user(n, argp))
437 if (mode & FMODE_EXCL)
438 return set_blocksize(bdev, n);
440 if (IS_ERR(blkdev_get_by_dev(bdev->bd_dev, mode | FMODE_EXCL, &bdev)))
442 ret = set_blocksize(bdev, n);
443 blkdev_put(bdev, mode | FMODE_EXCL);
449 * Common commands that are handled the same way on native and compat
450 * user space. Note the separate arg/argp parameters that are needed
451 * to deal with the compat_ptr() conversion.
453 static int blkdev_common_ioctl(struct block_device *bdev, fmode_t mode,
454 unsigned cmd, unsigned long arg, void __user *argp)
456 unsigned int max_sectors;
460 return blkdev_flushbuf(bdev, mode, cmd, arg);
462 return blkdev_roset(bdev, mode, cmd, arg);
464 return blk_ioctl_discard(bdev, mode, arg, 0);
466 return blk_ioctl_discard(bdev, mode, arg,
467 BLKDEV_DISCARD_SECURE);
469 return blk_ioctl_zeroout(bdev, mode, arg);
471 return blkdev_report_zones_ioctl(bdev, mode, cmd, arg);
476 return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg);
478 return put_uint(argp, bdev_zone_sectors(bdev));
480 return put_uint(argp, blkdev_nr_zones(bdev->bd_disk));
482 return put_int(argp, bdev_read_only(bdev) != 0);
483 case BLKSSZGET: /* get block device logical block size */
484 return put_int(argp, bdev_logical_block_size(bdev));
485 case BLKPBSZGET: /* get block device physical block size */
486 return put_uint(argp, bdev_physical_block_size(bdev));
488 return put_uint(argp, bdev_io_min(bdev));
490 return put_uint(argp, bdev_io_opt(bdev));
492 return put_int(argp, bdev_alignment_offset(bdev));
493 case BLKDISCARDZEROES:
494 return put_uint(argp, 0);
496 max_sectors = min_t(unsigned int, USHRT_MAX,
497 queue_max_sectors(bdev_get_queue(bdev)));
498 return put_ushort(argp, max_sectors);
500 return put_ushort(argp, !blk_queue_nonrot(bdev_get_queue(bdev)));
503 if(!capable(CAP_SYS_ADMIN))
505 bdev->bd_bdi->ra_pages = (arg * 512) / PAGE_SIZE;
508 return blkdev_reread_part(bdev, mode);
511 case BLKTRACETEARDOWN:
512 return blk_trace_ioctl(bdev, cmd, argp);
513 case IOC_PR_REGISTER:
514 return blkdev_pr_register(bdev, argp);
516 return blkdev_pr_reserve(bdev, argp);
518 return blkdev_pr_release(bdev, argp);
520 return blkdev_pr_preempt(bdev, argp, false);
521 case IOC_PR_PREEMPT_ABORT:
522 return blkdev_pr_preempt(bdev, argp, true);
524 return blkdev_pr_clear(bdev, argp);
531 * Always keep this in sync with compat_blkdev_ioctl()
532 * to handle all incompatible commands in both functions.
534 * New commands must be compatible and go into blkdev_common_ioctl
536 int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
541 void __user *argp = (void __user *)arg;
544 /* These need separate implementations for the data structure */
546 return blkdev_getgeo(bdev, argp);
548 return blkpg_ioctl(bdev, argp);
550 /* Compat mode returns 32-bit data instead of 'long' */
555 return put_long(argp, (bdev->bd_bdi->ra_pages*PAGE_SIZE) / 512);
557 size = i_size_read(bdev->bd_inode);
558 if ((size >> 9) > ~0UL)
560 return put_ulong(argp, size >> 9);
562 /* The data is compatible, but the command number is different */
563 case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
564 return put_int(argp, block_size(bdev));
566 return blkdev_bszset(bdev, mode, argp);
568 return put_u64(argp, i_size_read(bdev->bd_inode));
570 /* Incompatible alignment on i386 */
572 return blk_trace_ioctl(bdev, cmd, argp);
577 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
578 if (ret != -ENOIOCTLCMD)
581 if (!bdev->bd_disk->fops->ioctl)
583 return bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg);
585 EXPORT_SYMBOL_GPL(blkdev_ioctl); /* for /dev/raw */
589 #define BLKBSZGET_32 _IOR(0x12, 112, int)
590 #define BLKBSZSET_32 _IOW(0x12, 113, int)
591 #define BLKGETSIZE64_32 _IOR(0x12, 114, int)
593 /* Most of the generic ioctls are handled in the normal fallback path.
594 This assumes the blkdev's low level compat_ioctl always returns
595 ENOIOCTLCMD for unknown ioctls. */
596 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
599 void __user *argp = compat_ptr(arg);
600 struct block_device *bdev = I_BDEV(file->f_mapping->host);
601 struct gendisk *disk = bdev->bd_disk;
602 fmode_t mode = file->f_mode;
606 * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
607 * to updated it before every ioctl.
609 if (file->f_flags & O_NDELAY)
610 mode |= FMODE_NDELAY;
612 mode &= ~FMODE_NDELAY;
615 /* These need separate implementations for the data structure */
617 return compat_hdio_getgeo(bdev, argp);
619 return compat_blkpg_ioctl(bdev, argp);
621 /* Compat mode returns 32-bit data instead of 'long' */
626 return compat_put_long(argp,
627 (bdev->bd_bdi->ra_pages * PAGE_SIZE) / 512);
629 size = i_size_read(bdev->bd_inode);
630 if ((size >> 9) > ~0UL)
632 return compat_put_ulong(argp, size >> 9);
634 /* The data is compatible, but the command number is different */
635 case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
636 return put_int(argp, bdev_logical_block_size(bdev));
638 return blkdev_bszset(bdev, mode, argp);
639 case BLKGETSIZE64_32:
640 return put_u64(argp, i_size_read(bdev->bd_inode));
642 /* Incompatible alignment on i386 */
643 case BLKTRACESETUP32:
644 return blk_trace_ioctl(bdev, cmd, argp);
649 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
650 if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
651 ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);