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)
88 if (!disk_part_scan_enabled(bdev->bd_disk) || bdev_is_partition(bdev))
90 if (!capable(CAP_SYS_ADMIN))
93 mutex_lock(&bdev->bd_mutex);
94 ret = bdev_disk_changed(bdev, false);
95 mutex_unlock(&bdev->bd_mutex);
100 static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode,
101 unsigned long arg, unsigned long flags)
105 struct request_queue *q = bdev_get_queue(bdev);
108 if (!(mode & FMODE_WRITE))
111 if (!blk_queue_discard(q))
114 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
125 if (start + len > i_size_read(bdev->bd_inode))
128 err = truncate_bdev_range(bdev, mode, start, start + len - 1);
132 return blkdev_issue_discard(bdev, start >> 9, len >> 9,
136 static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode,
140 uint64_t start, end, len;
143 if (!(mode & FMODE_WRITE))
146 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
151 end = start + len - 1;
157 if (end >= (uint64_t)i_size_read(bdev->bd_inode))
162 /* Invalidate the page cache, including dirty pages */
163 err = truncate_bdev_range(bdev, mode, start, end);
167 return blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL,
168 BLKDEV_ZERO_NOUNMAP);
171 static int put_ushort(unsigned short __user *argp, unsigned short val)
173 return put_user(val, argp);
176 static int put_int(int __user *argp, int val)
178 return put_user(val, argp);
181 static int put_uint(unsigned int __user *argp, unsigned int val)
183 return put_user(val, argp);
186 static int put_long(long __user *argp, long val)
188 return put_user(val, argp);
191 static int put_ulong(unsigned long __user *argp, unsigned long val)
193 return put_user(val, argp);
196 static int put_u64(u64 __user *argp, u64 val)
198 return put_user(val, argp);
202 static int compat_put_long(compat_long_t __user *argp, long val)
204 return put_user(val, argp);
207 static int compat_put_ulong(compat_ulong_t __user *argp, compat_ulong_t val)
209 return put_user(val, argp);
215 * This is the equivalent of compat_ptr_ioctl(), to be used by block
216 * drivers that implement only commands that are completely compatible
217 * between 32-bit and 64-bit user space
219 int blkdev_compat_ptr_ioctl(struct block_device *bdev, fmode_t mode,
220 unsigned cmd, unsigned long arg)
222 struct gendisk *disk = bdev->bd_disk;
224 if (disk->fops->ioctl)
225 return disk->fops->ioctl(bdev, mode, cmd,
226 (unsigned long)compat_ptr(arg));
230 EXPORT_SYMBOL(blkdev_compat_ptr_ioctl);
233 static int blkdev_pr_register(struct block_device *bdev,
234 struct pr_registration __user *arg)
236 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
237 struct pr_registration reg;
239 if (!capable(CAP_SYS_ADMIN))
241 if (!ops || !ops->pr_register)
243 if (copy_from_user(®, arg, sizeof(reg)))
246 if (reg.flags & ~PR_FL_IGNORE_KEY)
248 return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags);
251 static int blkdev_pr_reserve(struct block_device *bdev,
252 struct pr_reservation __user *arg)
254 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
255 struct pr_reservation rsv;
257 if (!capable(CAP_SYS_ADMIN))
259 if (!ops || !ops->pr_reserve)
261 if (copy_from_user(&rsv, arg, sizeof(rsv)))
264 if (rsv.flags & ~PR_FL_IGNORE_KEY)
266 return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags);
269 static int blkdev_pr_release(struct block_device *bdev,
270 struct pr_reservation __user *arg)
272 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
273 struct pr_reservation rsv;
275 if (!capable(CAP_SYS_ADMIN))
277 if (!ops || !ops->pr_release)
279 if (copy_from_user(&rsv, arg, sizeof(rsv)))
284 return ops->pr_release(bdev, rsv.key, rsv.type);
287 static int blkdev_pr_preempt(struct block_device *bdev,
288 struct pr_preempt __user *arg, bool abort)
290 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
293 if (!capable(CAP_SYS_ADMIN))
295 if (!ops || !ops->pr_preempt)
297 if (copy_from_user(&p, arg, sizeof(p)))
302 return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort);
305 static int blkdev_pr_clear(struct block_device *bdev,
306 struct pr_clear __user *arg)
308 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
311 if (!capable(CAP_SYS_ADMIN))
313 if (!ops || !ops->pr_clear)
315 if (copy_from_user(&c, arg, sizeof(c)))
320 return ops->pr_clear(bdev, c.key);
323 static int blkdev_flushbuf(struct block_device *bdev, fmode_t mode,
324 unsigned cmd, unsigned long arg)
326 if (!capable(CAP_SYS_ADMIN))
329 invalidate_bdev(bdev);
333 static int blkdev_roset(struct block_device *bdev, fmode_t mode,
334 unsigned cmd, unsigned long arg)
338 if (!capable(CAP_SYS_ADMIN))
341 if (get_user(n, (int __user *)arg))
343 if (bdev->bd_disk->fops->set_read_only) {
344 ret = bdev->bd_disk->fops->set_read_only(bdev, n);
348 bdev->bd_read_only = n;
352 static int blkdev_getgeo(struct block_device *bdev,
353 struct hd_geometry __user *argp)
355 struct gendisk *disk = bdev->bd_disk;
356 struct hd_geometry geo;
361 if (!disk->fops->getgeo)
365 * We need to set the startsect first, the driver may
366 * want to override it.
368 memset(&geo, 0, sizeof(geo));
369 geo.start = get_start_sect(bdev);
370 ret = disk->fops->getgeo(bdev, &geo);
373 if (copy_to_user(argp, &geo, sizeof(geo)))
379 struct compat_hd_geometry {
381 unsigned char sectors;
382 unsigned short cylinders;
386 static int compat_hdio_getgeo(struct block_device *bdev,
387 struct compat_hd_geometry __user *ugeo)
389 struct gendisk *disk = bdev->bd_disk;
390 struct hd_geometry geo;
395 if (!disk->fops->getgeo)
398 memset(&geo, 0, sizeof(geo));
400 * We need to set the startsect first, the driver may
401 * want to override it.
403 geo.start = get_start_sect(bdev);
404 ret = disk->fops->getgeo(bdev, &geo);
408 ret = copy_to_user(ugeo, &geo, 4);
409 ret |= put_user(geo.start, &ugeo->start);
417 /* set the logical block size */
418 static int blkdev_bszset(struct block_device *bdev, fmode_t mode,
423 if (!capable(CAP_SYS_ADMIN))
427 if (get_user(n, argp))
430 if (mode & FMODE_EXCL)
431 return set_blocksize(bdev, n);
433 if (IS_ERR(blkdev_get_by_dev(bdev->bd_dev, mode | FMODE_EXCL, &bdev)))
435 ret = set_blocksize(bdev, n);
436 blkdev_put(bdev, mode | FMODE_EXCL);
442 * Common commands that are handled the same way on native and compat
443 * user space. Note the separate arg/argp parameters that are needed
444 * to deal with the compat_ptr() conversion.
446 static int blkdev_common_ioctl(struct block_device *bdev, fmode_t mode,
447 unsigned cmd, unsigned long arg, void __user *argp)
449 unsigned int max_sectors;
453 return blkdev_flushbuf(bdev, mode, cmd, arg);
455 return blkdev_roset(bdev, mode, cmd, arg);
457 return blk_ioctl_discard(bdev, mode, arg, 0);
459 return blk_ioctl_discard(bdev, mode, arg,
460 BLKDEV_DISCARD_SECURE);
462 return blk_ioctl_zeroout(bdev, mode, arg);
464 return blkdev_report_zones_ioctl(bdev, mode, cmd, arg);
469 return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg);
471 return put_uint(argp, bdev_zone_sectors(bdev));
473 return put_uint(argp, blkdev_nr_zones(bdev->bd_disk));
475 return put_int(argp, bdev_read_only(bdev) != 0);
476 case BLKSSZGET: /* get block device logical block size */
477 return put_int(argp, bdev_logical_block_size(bdev));
478 case BLKPBSZGET: /* get block device physical block size */
479 return put_uint(argp, bdev_physical_block_size(bdev));
481 return put_uint(argp, bdev_io_min(bdev));
483 return put_uint(argp, bdev_io_opt(bdev));
485 return put_int(argp, bdev_alignment_offset(bdev));
486 case BLKDISCARDZEROES:
487 return put_uint(argp, 0);
489 max_sectors = min_t(unsigned int, USHRT_MAX,
490 queue_max_sectors(bdev_get_queue(bdev)));
491 return put_ushort(argp, max_sectors);
493 return put_ushort(argp, !blk_queue_nonrot(bdev_get_queue(bdev)));
496 if(!capable(CAP_SYS_ADMIN))
498 bdev->bd_bdi->ra_pages = (arg * 512) / PAGE_SIZE;
501 return blkdev_reread_part(bdev);
504 case BLKTRACETEARDOWN:
505 return blk_trace_ioctl(bdev, cmd, argp);
506 case IOC_PR_REGISTER:
507 return blkdev_pr_register(bdev, argp);
509 return blkdev_pr_reserve(bdev, argp);
511 return blkdev_pr_release(bdev, argp);
513 return blkdev_pr_preempt(bdev, argp, false);
514 case IOC_PR_PREEMPT_ABORT:
515 return blkdev_pr_preempt(bdev, argp, true);
517 return blkdev_pr_clear(bdev, argp);
524 * Always keep this in sync with compat_blkdev_ioctl()
525 * to handle all incompatible commands in both functions.
527 * New commands must be compatible and go into blkdev_common_ioctl
529 int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
534 void __user *argp = (void __user *)arg;
537 /* These need separate implementations for the data structure */
539 return blkdev_getgeo(bdev, argp);
541 return blkpg_ioctl(bdev, argp);
543 /* Compat mode returns 32-bit data instead of 'long' */
548 return put_long(argp, (bdev->bd_bdi->ra_pages*PAGE_SIZE) / 512);
550 size = i_size_read(bdev->bd_inode);
551 if ((size >> 9) > ~0UL)
553 return put_ulong(argp, size >> 9);
555 /* The data is compatible, but the command number is different */
556 case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
557 return put_int(argp, block_size(bdev));
559 return blkdev_bszset(bdev, mode, argp);
561 return put_u64(argp, i_size_read(bdev->bd_inode));
563 /* Incompatible alignment on i386 */
565 return blk_trace_ioctl(bdev, cmd, argp);
570 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
571 if (ret != -ENOIOCTLCMD)
574 if (!bdev->bd_disk->fops->ioctl)
576 return bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg);
578 EXPORT_SYMBOL_GPL(blkdev_ioctl); /* for /dev/raw */
582 #define BLKBSZGET_32 _IOR(0x12, 112, int)
583 #define BLKBSZSET_32 _IOW(0x12, 113, int)
584 #define BLKGETSIZE64_32 _IOR(0x12, 114, int)
586 /* Most of the generic ioctls are handled in the normal fallback path.
587 This assumes the blkdev's low level compat_ioctl always returns
588 ENOIOCTLCMD for unknown ioctls. */
589 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
592 void __user *argp = compat_ptr(arg);
593 struct block_device *bdev = I_BDEV(file->f_mapping->host);
594 struct gendisk *disk = bdev->bd_disk;
595 fmode_t mode = file->f_mode;
599 * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
600 * to updated it before every ioctl.
602 if (file->f_flags & O_NDELAY)
603 mode |= FMODE_NDELAY;
605 mode &= ~FMODE_NDELAY;
608 /* These need separate implementations for the data structure */
610 return compat_hdio_getgeo(bdev, argp);
612 return compat_blkpg_ioctl(bdev, argp);
614 /* Compat mode returns 32-bit data instead of 'long' */
619 return compat_put_long(argp,
620 (bdev->bd_bdi->ra_pages * PAGE_SIZE) / 512);
622 size = i_size_read(bdev->bd_inode);
623 if ((size >> 9) > ~0UL)
625 return compat_put_ulong(argp, size >> 9);
627 /* The data is compatible, but the command number is different */
628 case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
629 return put_int(argp, bdev_logical_block_size(bdev));
631 return blkdev_bszset(bdev, mode, argp);
632 case BLKGETSIZE64_32:
633 return put_u64(argp, i_size_read(bdev->bd_inode));
635 /* Incompatible alignment on i386 */
636 case BLKTRACESETUP32:
637 return blk_trace_ioctl(bdev, cmd, argp);
642 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
643 if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
644 ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);