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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>
6#include <linux/gfp.h>
7#include <linux/blkpg.h>
8#include <linux/hdreg.h>
9#include <linux/backing-dev.h>
10#include <linux/fs.h>
11#include <linux/blktrace_api.h>
12#include <linux/pr.h>
13#include <linux/uaccess.h>
14#include "blk.h"
15
16static int blkpg_do_ioctl(struct block_device *bdev,
17 struct blkpg_partition __user *upart, int op)
18{
19 struct gendisk *disk = bdev->bd_disk;
20 struct blkpg_partition p;
21 long long start, length;
22
23 if (!capable(CAP_SYS_ADMIN))
24 return -EACCES;
25 if (copy_from_user(&p, upart, sizeof(struct blkpg_partition)))
26 return -EFAULT;
27 if (bdev_is_partition(bdev))
28 return -EINVAL;
29
30 if (p.pno <= 0)
31 return -EINVAL;
32
33 if (op == BLKPG_DEL_PARTITION)
34 return bdev_del_partition(disk, p.pno);
35
36 start = p.start >> SECTOR_SHIFT;
37 length = p.length >> SECTOR_SHIFT;
38
39 switch (op) {
40 case BLKPG_ADD_PARTITION:
41 /* check if partition is aligned to blocksize */
42 if (p.start & (bdev_logical_block_size(bdev) - 1))
43 return -EINVAL;
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);
47 default:
48 return -EINVAL;
49 }
50}
51
52static int blkpg_ioctl(struct block_device *bdev,
53 struct blkpg_ioctl_arg __user *arg)
54{
55 struct blkpg_partition __user *udata;
56 int op;
57
58 if (get_user(op, &arg->op) || get_user(udata, &arg->data))
59 return -EFAULT;
60
61 return blkpg_do_ioctl(bdev, udata, op);
62}
63
64#ifdef CONFIG_COMPAT
65struct compat_blkpg_ioctl_arg {
66 compat_int_t op;
67 compat_int_t flags;
68 compat_int_t datalen;
69 compat_caddr_t data;
70};
71
72static int compat_blkpg_ioctl(struct block_device *bdev,
73 struct compat_blkpg_ioctl_arg __user *arg)
74{
75 compat_caddr_t udata;
76 int op;
77
78 if (get_user(op, &arg->op) || get_user(udata, &arg->data))
79 return -EFAULT;
80
81 return blkpg_do_ioctl(bdev, compat_ptr(udata), op);
82}
83#endif
84
85static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode,
86 unsigned long arg)
87{
88 uint64_t range[2];
89 uint64_t start, len;
90 struct inode *inode = bdev->bd_inode;
91 int err;
92
93 if (!(mode & FMODE_WRITE))
94 return -EBADF;
95
96 if (!bdev_max_discard_sectors(bdev))
97 return -EOPNOTSUPP;
98
99 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
100 return -EFAULT;
101
102 start = range[0];
103 len = range[1];
104
105 if (start & 511)
106 return -EINVAL;
107 if (len & 511)
108 return -EINVAL;
109
110 if (start + len > bdev_nr_bytes(bdev))
111 return -EINVAL;
112
113 filemap_invalidate_lock(inode->i_mapping);
114 err = truncate_bdev_range(bdev, mode, start, start + len - 1);
115 if (err)
116 goto fail;
117 err = blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL);
118fail:
119 filemap_invalidate_unlock(inode->i_mapping);
120 return err;
121}
122
123static int blk_ioctl_secure_erase(struct block_device *bdev, fmode_t mode,
124 void __user *argp)
125{
126 uint64_t start, len;
127 uint64_t range[2];
128 int err;
129
130 if (!(mode & FMODE_WRITE))
131 return -EBADF;
132 if (!bdev_max_secure_erase_sectors(bdev))
133 return -EOPNOTSUPP;
134 if (copy_from_user(range, argp, sizeof(range)))
135 return -EFAULT;
136
137 start = range[0];
138 len = range[1];
139 if ((start & 511) || (len & 511))
140 return -EINVAL;
141 if (start + len > bdev_nr_bytes(bdev))
142 return -EINVAL;
143
144 filemap_invalidate_lock(bdev->bd_inode->i_mapping);
145 err = truncate_bdev_range(bdev, mode, start, start + len - 1);
146 if (!err)
147 err = blkdev_issue_secure_erase(bdev, start >> 9, len >> 9,
148 GFP_KERNEL);
149 filemap_invalidate_unlock(bdev->bd_inode->i_mapping);
150 return err;
151}
152
153
154static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode,
155 unsigned long arg)
156{
157 uint64_t range[2];
158 uint64_t start, end, len;
159 struct inode *inode = bdev->bd_inode;
160 int err;
161
162 if (!(mode & FMODE_WRITE))
163 return -EBADF;
164
165 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
166 return -EFAULT;
167
168 start = range[0];
169 len = range[1];
170 end = start + len - 1;
171
172 if (start & 511)
173 return -EINVAL;
174 if (len & 511)
175 return -EINVAL;
176 if (end >= (uint64_t)bdev_nr_bytes(bdev))
177 return -EINVAL;
178 if (end < start)
179 return -EINVAL;
180
181 /* Invalidate the page cache, including dirty pages */
182 filemap_invalidate_lock(inode->i_mapping);
183 err = truncate_bdev_range(bdev, mode, start, end);
184 if (err)
185 goto fail;
186
187 err = blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL,
188 BLKDEV_ZERO_NOUNMAP);
189
190fail:
191 filemap_invalidate_unlock(inode->i_mapping);
192 return err;
193}
194
195static int put_ushort(unsigned short __user *argp, unsigned short val)
196{
197 return put_user(val, argp);
198}
199
200static int put_int(int __user *argp, int val)
201{
202 return put_user(val, argp);
203}
204
205static int put_uint(unsigned int __user *argp, unsigned int val)
206{
207 return put_user(val, argp);
208}
209
210static int put_long(long __user *argp, long val)
211{
212 return put_user(val, argp);
213}
214
215static int put_ulong(unsigned long __user *argp, unsigned long val)
216{
217 return put_user(val, argp);
218}
219
220static int put_u64(u64 __user *argp, u64 val)
221{
222 return put_user(val, argp);
223}
224
225#ifdef CONFIG_COMPAT
226static int compat_put_long(compat_long_t __user *argp, long val)
227{
228 return put_user(val, argp);
229}
230
231static int compat_put_ulong(compat_ulong_t __user *argp, compat_ulong_t val)
232{
233 return put_user(val, argp);
234}
235#endif
236
237#ifdef CONFIG_COMPAT
238/*
239 * This is the equivalent of compat_ptr_ioctl(), to be used by block
240 * drivers that implement only commands that are completely compatible
241 * between 32-bit and 64-bit user space
242 */
243int blkdev_compat_ptr_ioctl(struct block_device *bdev, fmode_t mode,
244 unsigned cmd, unsigned long arg)
245{
246 struct gendisk *disk = bdev->bd_disk;
247
248 if (disk->fops->ioctl)
249 return disk->fops->ioctl(bdev, mode, cmd,
250 (unsigned long)compat_ptr(arg));
251
252 return -ENOIOCTLCMD;
253}
254EXPORT_SYMBOL(blkdev_compat_ptr_ioctl);
255#endif
256
257static int blkdev_pr_register(struct block_device *bdev,
258 struct pr_registration __user *arg)
259{
260 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
261 struct pr_registration reg;
262
263 if (!capable(CAP_SYS_ADMIN))
264 return -EPERM;
265 if (!ops || !ops->pr_register)
266 return -EOPNOTSUPP;
267 if (copy_from_user(®, arg, sizeof(reg)))
268 return -EFAULT;
269
270 if (reg.flags & ~PR_FL_IGNORE_KEY)
271 return -EOPNOTSUPP;
272 return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags);
273}
274
275static int blkdev_pr_reserve(struct block_device *bdev,
276 struct pr_reservation __user *arg)
277{
278 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
279 struct pr_reservation rsv;
280
281 if (!capable(CAP_SYS_ADMIN))
282 return -EPERM;
283 if (!ops || !ops->pr_reserve)
284 return -EOPNOTSUPP;
285 if (copy_from_user(&rsv, arg, sizeof(rsv)))
286 return -EFAULT;
287
288 if (rsv.flags & ~PR_FL_IGNORE_KEY)
289 return -EOPNOTSUPP;
290 return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags);
291}
292
293static int blkdev_pr_release(struct block_device *bdev,
294 struct pr_reservation __user *arg)
295{
296 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
297 struct pr_reservation rsv;
298
299 if (!capable(CAP_SYS_ADMIN))
300 return -EPERM;
301 if (!ops || !ops->pr_release)
302 return -EOPNOTSUPP;
303 if (copy_from_user(&rsv, arg, sizeof(rsv)))
304 return -EFAULT;
305
306 if (rsv.flags)
307 return -EOPNOTSUPP;
308 return ops->pr_release(bdev, rsv.key, rsv.type);
309}
310
311static int blkdev_pr_preempt(struct block_device *bdev,
312 struct pr_preempt __user *arg, bool abort)
313{
314 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
315 struct pr_preempt p;
316
317 if (!capable(CAP_SYS_ADMIN))
318 return -EPERM;
319 if (!ops || !ops->pr_preempt)
320 return -EOPNOTSUPP;
321 if (copy_from_user(&p, arg, sizeof(p)))
322 return -EFAULT;
323
324 if (p.flags)
325 return -EOPNOTSUPP;
326 return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort);
327}
328
329static int blkdev_pr_clear(struct block_device *bdev,
330 struct pr_clear __user *arg)
331{
332 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
333 struct pr_clear c;
334
335 if (!capable(CAP_SYS_ADMIN))
336 return -EPERM;
337 if (!ops || !ops->pr_clear)
338 return -EOPNOTSUPP;
339 if (copy_from_user(&c, arg, sizeof(c)))
340 return -EFAULT;
341
342 if (c.flags)
343 return -EOPNOTSUPP;
344 return ops->pr_clear(bdev, c.key);
345}
346
347static int blkdev_flushbuf(struct block_device *bdev, fmode_t mode,
348 unsigned cmd, unsigned long arg)
349{
350 if (!capable(CAP_SYS_ADMIN))
351 return -EACCES;
352 fsync_bdev(bdev);
353 invalidate_bdev(bdev);
354 return 0;
355}
356
357static int blkdev_roset(struct block_device *bdev, fmode_t mode,
358 unsigned cmd, unsigned long arg)
359{
360 int ret, n;
361
362 if (!capable(CAP_SYS_ADMIN))
363 return -EACCES;
364
365 if (get_user(n, (int __user *)arg))
366 return -EFAULT;
367 if (bdev->bd_disk->fops->set_read_only) {
368 ret = bdev->bd_disk->fops->set_read_only(bdev, n);
369 if (ret)
370 return ret;
371 }
372 bdev->bd_read_only = n;
373 return 0;
374}
375
376static int blkdev_getgeo(struct block_device *bdev,
377 struct hd_geometry __user *argp)
378{
379 struct gendisk *disk = bdev->bd_disk;
380 struct hd_geometry geo;
381 int ret;
382
383 if (!argp)
384 return -EINVAL;
385 if (!disk->fops->getgeo)
386 return -ENOTTY;
387
388 /*
389 * We need to set the startsect first, the driver may
390 * want to override it.
391 */
392 memset(&geo, 0, sizeof(geo));
393 geo.start = get_start_sect(bdev);
394 ret = disk->fops->getgeo(bdev, &geo);
395 if (ret)
396 return ret;
397 if (copy_to_user(argp, &geo, sizeof(geo)))
398 return -EFAULT;
399 return 0;
400}
401
402#ifdef CONFIG_COMPAT
403struct compat_hd_geometry {
404 unsigned char heads;
405 unsigned char sectors;
406 unsigned short cylinders;
407 u32 start;
408};
409
410static int compat_hdio_getgeo(struct block_device *bdev,
411 struct compat_hd_geometry __user *ugeo)
412{
413 struct gendisk *disk = bdev->bd_disk;
414 struct hd_geometry geo;
415 int ret;
416
417 if (!ugeo)
418 return -EINVAL;
419 if (!disk->fops->getgeo)
420 return -ENOTTY;
421
422 memset(&geo, 0, sizeof(geo));
423 /*
424 * We need to set the startsect first, the driver may
425 * want to override it.
426 */
427 geo.start = get_start_sect(bdev);
428 ret = disk->fops->getgeo(bdev, &geo);
429 if (ret)
430 return ret;
431
432 ret = copy_to_user(ugeo, &geo, 4);
433 ret |= put_user(geo.start, &ugeo->start);
434 if (ret)
435 ret = -EFAULT;
436
437 return ret;
438}
439#endif
440
441/* set the logical block size */
442static int blkdev_bszset(struct block_device *bdev, fmode_t mode,
443 int __user *argp)
444{
445 int ret, n;
446
447 if (!capable(CAP_SYS_ADMIN))
448 return -EACCES;
449 if (!argp)
450 return -EINVAL;
451 if (get_user(n, argp))
452 return -EFAULT;
453
454 if (mode & FMODE_EXCL)
455 return set_blocksize(bdev, n);
456
457 if (IS_ERR(blkdev_get_by_dev(bdev->bd_dev, mode | FMODE_EXCL, &bdev)))
458 return -EBUSY;
459 ret = set_blocksize(bdev, n);
460 blkdev_put(bdev, mode | FMODE_EXCL);
461
462 return ret;
463}
464
465/*
466 * Common commands that are handled the same way on native and compat
467 * user space. Note the separate arg/argp parameters that are needed
468 * to deal with the compat_ptr() conversion.
469 */
470static int blkdev_common_ioctl(struct file *file, fmode_t mode, unsigned cmd,
471 unsigned long arg, void __user *argp)
472{
473 struct block_device *bdev = I_BDEV(file->f_mapping->host);
474 unsigned int max_sectors;
475
476 switch (cmd) {
477 case BLKFLSBUF:
478 return blkdev_flushbuf(bdev, mode, cmd, arg);
479 case BLKROSET:
480 return blkdev_roset(bdev, mode, cmd, arg);
481 case BLKDISCARD:
482 return blk_ioctl_discard(bdev, mode, arg);
483 case BLKSECDISCARD:
484 return blk_ioctl_secure_erase(bdev, mode, argp);
485 case BLKZEROOUT:
486 return blk_ioctl_zeroout(bdev, mode, arg);
487 case BLKGETDISKSEQ:
488 return put_u64(argp, bdev->bd_disk->diskseq);
489 case BLKREPORTZONE:
490 return blkdev_report_zones_ioctl(bdev, mode, cmd, arg);
491 case BLKRESETZONE:
492 case BLKOPENZONE:
493 case BLKCLOSEZONE:
494 case BLKFINISHZONE:
495 return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg);
496 case BLKGETZONESZ:
497 return put_uint(argp, bdev_zone_sectors(bdev));
498 case BLKGETNRZONES:
499 return put_uint(argp, bdev_nr_zones(bdev));
500 case BLKROGET:
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));
506 case BLKIOMIN:
507 return put_uint(argp, bdev_io_min(bdev));
508 case BLKIOOPT:
509 return put_uint(argp, bdev_io_opt(bdev));
510 case BLKALIGNOFF:
511 return put_int(argp, bdev_alignment_offset(bdev));
512 case BLKDISCARDZEROES:
513 return put_uint(argp, 0);
514 case BLKSECTGET:
515 max_sectors = min_t(unsigned int, USHRT_MAX,
516 queue_max_sectors(bdev_get_queue(bdev)));
517 return put_ushort(argp, max_sectors);
518 case BLKROTATIONAL:
519 return put_ushort(argp, !bdev_nonrot(bdev));
520 case BLKRASET:
521 case BLKFRASET:
522 if(!capable(CAP_SYS_ADMIN))
523 return -EACCES;
524 bdev->bd_disk->bdi->ra_pages = (arg * 512) / PAGE_SIZE;
525 return 0;
526 case BLKRRPART:
527 if (!capable(CAP_SYS_ADMIN))
528 return -EACCES;
529 if (bdev_is_partition(bdev))
530 return -EINVAL;
531 return disk_scan_partitions(bdev->bd_disk, mode & ~FMODE_EXCL,
532 file);
533 case BLKTRACESTART:
534 case BLKTRACESTOP:
535 case BLKTRACETEARDOWN:
536 return blk_trace_ioctl(bdev, cmd, argp);
537 case IOC_PR_REGISTER:
538 return blkdev_pr_register(bdev, argp);
539 case IOC_PR_RESERVE:
540 return blkdev_pr_reserve(bdev, argp);
541 case IOC_PR_RELEASE:
542 return blkdev_pr_release(bdev, argp);
543 case IOC_PR_PREEMPT:
544 return blkdev_pr_preempt(bdev, argp, false);
545 case IOC_PR_PREEMPT_ABORT:
546 return blkdev_pr_preempt(bdev, argp, true);
547 case IOC_PR_CLEAR:
548 return blkdev_pr_clear(bdev, argp);
549 default:
550 return -ENOIOCTLCMD;
551 }
552}
553
554/*
555 * Always keep this in sync with compat_blkdev_ioctl()
556 * to handle all incompatible commands in both functions.
557 *
558 * New commands must be compatible and go into blkdev_common_ioctl
559 */
560long blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
561{
562 struct block_device *bdev = I_BDEV(file->f_mapping->host);
563 void __user *argp = (void __user *)arg;
564 fmode_t mode = file->f_mode;
565 int ret;
566
567 /*
568 * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
569 * to updated it before every ioctl.
570 */
571 if (file->f_flags & O_NDELAY)
572 mode |= FMODE_NDELAY;
573 else
574 mode &= ~FMODE_NDELAY;
575
576 switch (cmd) {
577 /* These need separate implementations for the data structure */
578 case HDIO_GETGEO:
579 return blkdev_getgeo(bdev, argp);
580 case BLKPG:
581 return blkpg_ioctl(bdev, argp);
582
583 /* Compat mode returns 32-bit data instead of 'long' */
584 case BLKRAGET:
585 case BLKFRAGET:
586 if (!argp)
587 return -EINVAL;
588 return put_long(argp,
589 (bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512);
590 case BLKGETSIZE:
591 if (bdev_nr_sectors(bdev) > ~0UL)
592 return -EFBIG;
593 return put_ulong(argp, bdev_nr_sectors(bdev));
594
595 /* The data is compatible, but the command number is different */
596 case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
597 return put_int(argp, block_size(bdev));
598 case BLKBSZSET:
599 return blkdev_bszset(bdev, mode, argp);
600 case BLKGETSIZE64:
601 return put_u64(argp, bdev_nr_bytes(bdev));
602
603 /* Incompatible alignment on i386 */
604 case BLKTRACESETUP:
605 return blk_trace_ioctl(bdev, cmd, argp);
606 default:
607 break;
608 }
609
610 ret = blkdev_common_ioctl(file, mode, cmd, arg, argp);
611 if (ret != -ENOIOCTLCMD)
612 return ret;
613
614 if (!bdev->bd_disk->fops->ioctl)
615 return -ENOTTY;
616 return bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg);
617}
618
619#ifdef CONFIG_COMPAT
620
621#define BLKBSZGET_32 _IOR(0x12, 112, int)
622#define BLKBSZSET_32 _IOW(0x12, 113, int)
623#define BLKGETSIZE64_32 _IOR(0x12, 114, int)
624
625/* Most of the generic ioctls are handled in the normal fallback path.
626 This assumes the blkdev's low level compat_ioctl always returns
627 ENOIOCTLCMD for unknown ioctls. */
628long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
629{
630 int ret;
631 void __user *argp = compat_ptr(arg);
632 struct block_device *bdev = I_BDEV(file->f_mapping->host);
633 struct gendisk *disk = bdev->bd_disk;
634 fmode_t mode = file->f_mode;
635
636 /*
637 * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
638 * to updated it before every ioctl.
639 */
640 if (file->f_flags & O_NDELAY)
641 mode |= FMODE_NDELAY;
642 else
643 mode &= ~FMODE_NDELAY;
644
645 switch (cmd) {
646 /* These need separate implementations for the data structure */
647 case HDIO_GETGEO:
648 return compat_hdio_getgeo(bdev, argp);
649 case BLKPG:
650 return compat_blkpg_ioctl(bdev, argp);
651
652 /* Compat mode returns 32-bit data instead of 'long' */
653 case BLKRAGET:
654 case BLKFRAGET:
655 if (!argp)
656 return -EINVAL;
657 return compat_put_long(argp,
658 (bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512);
659 case BLKGETSIZE:
660 if (bdev_nr_sectors(bdev) > ~(compat_ulong_t)0)
661 return -EFBIG;
662 return compat_put_ulong(argp, bdev_nr_sectors(bdev));
663
664 /* The data is compatible, but the command number is different */
665 case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
666 return put_int(argp, bdev_logical_block_size(bdev));
667 case BLKBSZSET_32:
668 return blkdev_bszset(bdev, mode, argp);
669 case BLKGETSIZE64_32:
670 return put_u64(argp, bdev_nr_bytes(bdev));
671
672 /* Incompatible alignment on i386 */
673 case BLKTRACESETUP32:
674 return blk_trace_ioctl(bdev, cmd, argp);
675 default:
676 break;
677 }
678
679 ret = blkdev_common_ioctl(file, mode, cmd, arg, argp);
680 if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
681 ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
682
683 return ret;
684}
685#endif
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>
6#include <linux/gfp.h>
7#include <linux/blkpg.h>
8#include <linux/hdreg.h>
9#include <linux/backing-dev.h>
10#include <linux/fs.h>
11#include <linux/blktrace_api.h>
12#include <linux/pr.h>
13#include <linux/uaccess.h>
14#include "blk.h"
15
16static int blkpg_do_ioctl(struct block_device *bdev,
17 struct blkpg_partition __user *upart, int op)
18{
19 struct gendisk *disk = bdev->bd_disk;
20 struct blkpg_partition p;
21 sector_t start, length, capacity, end;
22
23 if (!capable(CAP_SYS_ADMIN))
24 return -EACCES;
25 if (copy_from_user(&p, upart, sizeof(struct blkpg_partition)))
26 return -EFAULT;
27 if (bdev_is_partition(bdev))
28 return -EINVAL;
29
30 if (p.pno <= 0)
31 return -EINVAL;
32
33 if (op == BLKPG_DEL_PARTITION)
34 return bdev_del_partition(disk, p.pno);
35
36 if (p.start < 0 || p.length <= 0 || p.start + p.length < 0)
37 return -EINVAL;
38 /* Check that the partition is aligned to the block size */
39 if (!IS_ALIGNED(p.start | p.length, bdev_logical_block_size(bdev)))
40 return -EINVAL;
41
42 start = p.start >> SECTOR_SHIFT;
43 length = p.length >> SECTOR_SHIFT;
44 capacity = get_capacity(disk);
45
46 if (check_add_overflow(start, length, &end))
47 return -EINVAL;
48
49 if (start >= capacity || end > capacity)
50 return -EINVAL;
51
52 switch (op) {
53 case BLKPG_ADD_PARTITION:
54 return bdev_add_partition(disk, p.pno, start, length);
55 case BLKPG_RESIZE_PARTITION:
56 return bdev_resize_partition(disk, p.pno, start, length);
57 default:
58 return -EINVAL;
59 }
60}
61
62static int blkpg_ioctl(struct block_device *bdev,
63 struct blkpg_ioctl_arg __user *arg)
64{
65 struct blkpg_partition __user *udata;
66 int op;
67
68 if (get_user(op, &arg->op) || get_user(udata, &arg->data))
69 return -EFAULT;
70
71 return blkpg_do_ioctl(bdev, udata, op);
72}
73
74#ifdef CONFIG_COMPAT
75struct compat_blkpg_ioctl_arg {
76 compat_int_t op;
77 compat_int_t flags;
78 compat_int_t datalen;
79 compat_caddr_t data;
80};
81
82static int compat_blkpg_ioctl(struct block_device *bdev,
83 struct compat_blkpg_ioctl_arg __user *arg)
84{
85 compat_caddr_t udata;
86 int op;
87
88 if (get_user(op, &arg->op) || get_user(udata, &arg->data))
89 return -EFAULT;
90
91 return blkpg_do_ioctl(bdev, compat_ptr(udata), op);
92}
93#endif
94
95static int blk_ioctl_discard(struct block_device *bdev, blk_mode_t mode,
96 unsigned long arg)
97{
98 uint64_t range[2];
99 uint64_t start, len, end;
100 struct inode *inode = bdev->bd_inode;
101 int err;
102
103 if (!(mode & BLK_OPEN_WRITE))
104 return -EBADF;
105
106 if (!bdev_max_discard_sectors(bdev))
107 return -EOPNOTSUPP;
108
109 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
110 return -EFAULT;
111
112 start = range[0];
113 len = range[1];
114
115 if (start & 511)
116 return -EINVAL;
117 if (len & 511)
118 return -EINVAL;
119
120 if (check_add_overflow(start, len, &end) ||
121 end > bdev_nr_bytes(bdev))
122 return -EINVAL;
123
124 filemap_invalidate_lock(inode->i_mapping);
125 err = truncate_bdev_range(bdev, mode, start, start + len - 1);
126 if (err)
127 goto fail;
128 err = blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL);
129fail:
130 filemap_invalidate_unlock(inode->i_mapping);
131 return err;
132}
133
134static int blk_ioctl_secure_erase(struct block_device *bdev, blk_mode_t mode,
135 void __user *argp)
136{
137 uint64_t start, len;
138 uint64_t range[2];
139 int err;
140
141 if (!(mode & BLK_OPEN_WRITE))
142 return -EBADF;
143 if (!bdev_max_secure_erase_sectors(bdev))
144 return -EOPNOTSUPP;
145 if (copy_from_user(range, argp, sizeof(range)))
146 return -EFAULT;
147
148 start = range[0];
149 len = range[1];
150 if ((start & 511) || (len & 511))
151 return -EINVAL;
152 if (start + len > bdev_nr_bytes(bdev))
153 return -EINVAL;
154
155 filemap_invalidate_lock(bdev->bd_inode->i_mapping);
156 err = truncate_bdev_range(bdev, mode, start, start + len - 1);
157 if (!err)
158 err = blkdev_issue_secure_erase(bdev, start >> 9, len >> 9,
159 GFP_KERNEL);
160 filemap_invalidate_unlock(bdev->bd_inode->i_mapping);
161 return err;
162}
163
164
165static int blk_ioctl_zeroout(struct block_device *bdev, blk_mode_t mode,
166 unsigned long arg)
167{
168 uint64_t range[2];
169 uint64_t start, end, len;
170 struct inode *inode = bdev->bd_inode;
171 int err;
172
173 if (!(mode & BLK_OPEN_WRITE))
174 return -EBADF;
175
176 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
177 return -EFAULT;
178
179 start = range[0];
180 len = range[1];
181 end = start + len - 1;
182
183 if (start & 511)
184 return -EINVAL;
185 if (len & 511)
186 return -EINVAL;
187 if (end >= (uint64_t)bdev_nr_bytes(bdev))
188 return -EINVAL;
189 if (end < start)
190 return -EINVAL;
191
192 /* Invalidate the page cache, including dirty pages */
193 filemap_invalidate_lock(inode->i_mapping);
194 err = truncate_bdev_range(bdev, mode, start, end);
195 if (err)
196 goto fail;
197
198 err = blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL,
199 BLKDEV_ZERO_NOUNMAP);
200
201fail:
202 filemap_invalidate_unlock(inode->i_mapping);
203 return err;
204}
205
206static int put_ushort(unsigned short __user *argp, unsigned short val)
207{
208 return put_user(val, argp);
209}
210
211static int put_int(int __user *argp, int val)
212{
213 return put_user(val, argp);
214}
215
216static int put_uint(unsigned int __user *argp, unsigned int val)
217{
218 return put_user(val, argp);
219}
220
221static int put_long(long __user *argp, long val)
222{
223 return put_user(val, argp);
224}
225
226static int put_ulong(unsigned long __user *argp, unsigned long val)
227{
228 return put_user(val, argp);
229}
230
231static int put_u64(u64 __user *argp, u64 val)
232{
233 return put_user(val, argp);
234}
235
236#ifdef CONFIG_COMPAT
237static int compat_put_long(compat_long_t __user *argp, long val)
238{
239 return put_user(val, argp);
240}
241
242static int compat_put_ulong(compat_ulong_t __user *argp, compat_ulong_t val)
243{
244 return put_user(val, argp);
245}
246#endif
247
248#ifdef CONFIG_COMPAT
249/*
250 * This is the equivalent of compat_ptr_ioctl(), to be used by block
251 * drivers that implement only commands that are completely compatible
252 * between 32-bit and 64-bit user space
253 */
254int blkdev_compat_ptr_ioctl(struct block_device *bdev, blk_mode_t mode,
255 unsigned cmd, unsigned long arg)
256{
257 struct gendisk *disk = bdev->bd_disk;
258
259 if (disk->fops->ioctl)
260 return disk->fops->ioctl(bdev, mode, cmd,
261 (unsigned long)compat_ptr(arg));
262
263 return -ENOIOCTLCMD;
264}
265EXPORT_SYMBOL(blkdev_compat_ptr_ioctl);
266#endif
267
268static bool blkdev_pr_allowed(struct block_device *bdev, blk_mode_t mode)
269{
270 /* no sense to make reservations for partitions */
271 if (bdev_is_partition(bdev))
272 return false;
273
274 if (capable(CAP_SYS_ADMIN))
275 return true;
276 /*
277 * Only allow unprivileged reservations if the file descriptor is open
278 * for writing.
279 */
280 return mode & BLK_OPEN_WRITE;
281}
282
283static int blkdev_pr_register(struct block_device *bdev, blk_mode_t mode,
284 struct pr_registration __user *arg)
285{
286 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
287 struct pr_registration reg;
288
289 if (!blkdev_pr_allowed(bdev, mode))
290 return -EPERM;
291 if (!ops || !ops->pr_register)
292 return -EOPNOTSUPP;
293 if (copy_from_user(®, arg, sizeof(reg)))
294 return -EFAULT;
295
296 if (reg.flags & ~PR_FL_IGNORE_KEY)
297 return -EOPNOTSUPP;
298 return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags);
299}
300
301static int blkdev_pr_reserve(struct block_device *bdev, blk_mode_t mode,
302 struct pr_reservation __user *arg)
303{
304 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
305 struct pr_reservation rsv;
306
307 if (!blkdev_pr_allowed(bdev, mode))
308 return -EPERM;
309 if (!ops || !ops->pr_reserve)
310 return -EOPNOTSUPP;
311 if (copy_from_user(&rsv, arg, sizeof(rsv)))
312 return -EFAULT;
313
314 if (rsv.flags & ~PR_FL_IGNORE_KEY)
315 return -EOPNOTSUPP;
316 return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags);
317}
318
319static int blkdev_pr_release(struct block_device *bdev, blk_mode_t mode,
320 struct pr_reservation __user *arg)
321{
322 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
323 struct pr_reservation rsv;
324
325 if (!blkdev_pr_allowed(bdev, mode))
326 return -EPERM;
327 if (!ops || !ops->pr_release)
328 return -EOPNOTSUPP;
329 if (copy_from_user(&rsv, arg, sizeof(rsv)))
330 return -EFAULT;
331
332 if (rsv.flags)
333 return -EOPNOTSUPP;
334 return ops->pr_release(bdev, rsv.key, rsv.type);
335}
336
337static int blkdev_pr_preempt(struct block_device *bdev, blk_mode_t mode,
338 struct pr_preempt __user *arg, bool abort)
339{
340 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
341 struct pr_preempt p;
342
343 if (!blkdev_pr_allowed(bdev, mode))
344 return -EPERM;
345 if (!ops || !ops->pr_preempt)
346 return -EOPNOTSUPP;
347 if (copy_from_user(&p, arg, sizeof(p)))
348 return -EFAULT;
349
350 if (p.flags)
351 return -EOPNOTSUPP;
352 return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort);
353}
354
355static int blkdev_pr_clear(struct block_device *bdev, blk_mode_t mode,
356 struct pr_clear __user *arg)
357{
358 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
359 struct pr_clear c;
360
361 if (!blkdev_pr_allowed(bdev, mode))
362 return -EPERM;
363 if (!ops || !ops->pr_clear)
364 return -EOPNOTSUPP;
365 if (copy_from_user(&c, arg, sizeof(c)))
366 return -EFAULT;
367
368 if (c.flags)
369 return -EOPNOTSUPP;
370 return ops->pr_clear(bdev, c.key);
371}
372
373static int blkdev_flushbuf(struct block_device *bdev, unsigned cmd,
374 unsigned long arg)
375{
376 if (!capable(CAP_SYS_ADMIN))
377 return -EACCES;
378
379 mutex_lock(&bdev->bd_holder_lock);
380 if (bdev->bd_holder_ops && bdev->bd_holder_ops->sync)
381 bdev->bd_holder_ops->sync(bdev);
382 else {
383 mutex_unlock(&bdev->bd_holder_lock);
384 sync_blockdev(bdev);
385 }
386
387 invalidate_bdev(bdev);
388 return 0;
389}
390
391static int blkdev_roset(struct block_device *bdev, unsigned cmd,
392 unsigned long arg)
393{
394 int ret, n;
395
396 if (!capable(CAP_SYS_ADMIN))
397 return -EACCES;
398
399 if (get_user(n, (int __user *)arg))
400 return -EFAULT;
401 if (bdev->bd_disk->fops->set_read_only) {
402 ret = bdev->bd_disk->fops->set_read_only(bdev, n);
403 if (ret)
404 return ret;
405 }
406 bdev->bd_read_only = n;
407 return 0;
408}
409
410static int blkdev_getgeo(struct block_device *bdev,
411 struct hd_geometry __user *argp)
412{
413 struct gendisk *disk = bdev->bd_disk;
414 struct hd_geometry geo;
415 int ret;
416
417 if (!argp)
418 return -EINVAL;
419 if (!disk->fops->getgeo)
420 return -ENOTTY;
421
422 /*
423 * We need to set the startsect first, the driver may
424 * want to override it.
425 */
426 memset(&geo, 0, sizeof(geo));
427 geo.start = get_start_sect(bdev);
428 ret = disk->fops->getgeo(bdev, &geo);
429 if (ret)
430 return ret;
431 if (copy_to_user(argp, &geo, sizeof(geo)))
432 return -EFAULT;
433 return 0;
434}
435
436#ifdef CONFIG_COMPAT
437struct compat_hd_geometry {
438 unsigned char heads;
439 unsigned char sectors;
440 unsigned short cylinders;
441 u32 start;
442};
443
444static int compat_hdio_getgeo(struct block_device *bdev,
445 struct compat_hd_geometry __user *ugeo)
446{
447 struct gendisk *disk = bdev->bd_disk;
448 struct hd_geometry geo;
449 int ret;
450
451 if (!ugeo)
452 return -EINVAL;
453 if (!disk->fops->getgeo)
454 return -ENOTTY;
455
456 memset(&geo, 0, sizeof(geo));
457 /*
458 * We need to set the startsect first, the driver may
459 * want to override it.
460 */
461 geo.start = get_start_sect(bdev);
462 ret = disk->fops->getgeo(bdev, &geo);
463 if (ret)
464 return ret;
465
466 ret = copy_to_user(ugeo, &geo, 4);
467 ret |= put_user(geo.start, &ugeo->start);
468 if (ret)
469 ret = -EFAULT;
470
471 return ret;
472}
473#endif
474
475/* set the logical block size */
476static int blkdev_bszset(struct block_device *bdev, blk_mode_t mode,
477 int __user *argp)
478{
479 int ret, n;
480 struct file *file;
481
482 if (!capable(CAP_SYS_ADMIN))
483 return -EACCES;
484 if (!argp)
485 return -EINVAL;
486 if (get_user(n, argp))
487 return -EFAULT;
488
489 if (mode & BLK_OPEN_EXCL)
490 return set_blocksize(bdev, n);
491
492 file = bdev_file_open_by_dev(bdev->bd_dev, mode, &bdev, NULL);
493 if (IS_ERR(file))
494 return -EBUSY;
495 ret = set_blocksize(bdev, n);
496 fput(file);
497 return ret;
498}
499
500/*
501 * Common commands that are handled the same way on native and compat
502 * user space. Note the separate arg/argp parameters that are needed
503 * to deal with the compat_ptr() conversion.
504 */
505static int blkdev_common_ioctl(struct block_device *bdev, blk_mode_t mode,
506 unsigned int cmd, unsigned long arg,
507 void __user *argp)
508{
509 unsigned int max_sectors;
510
511 switch (cmd) {
512 case BLKFLSBUF:
513 return blkdev_flushbuf(bdev, cmd, arg);
514 case BLKROSET:
515 return blkdev_roset(bdev, cmd, arg);
516 case BLKDISCARD:
517 return blk_ioctl_discard(bdev, mode, arg);
518 case BLKSECDISCARD:
519 return blk_ioctl_secure_erase(bdev, mode, argp);
520 case BLKZEROOUT:
521 return blk_ioctl_zeroout(bdev, mode, arg);
522 case BLKGETDISKSEQ:
523 return put_u64(argp, bdev->bd_disk->diskseq);
524 case BLKREPORTZONE:
525 return blkdev_report_zones_ioctl(bdev, cmd, arg);
526 case BLKRESETZONE:
527 case BLKOPENZONE:
528 case BLKCLOSEZONE:
529 case BLKFINISHZONE:
530 return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg);
531 case BLKGETZONESZ:
532 return put_uint(argp, bdev_zone_sectors(bdev));
533 case BLKGETNRZONES:
534 return put_uint(argp, bdev_nr_zones(bdev));
535 case BLKROGET:
536 return put_int(argp, bdev_read_only(bdev) != 0);
537 case BLKSSZGET: /* get block device logical block size */
538 return put_int(argp, bdev_logical_block_size(bdev));
539 case BLKPBSZGET: /* get block device physical block size */
540 return put_uint(argp, bdev_physical_block_size(bdev));
541 case BLKIOMIN:
542 return put_uint(argp, bdev_io_min(bdev));
543 case BLKIOOPT:
544 return put_uint(argp, bdev_io_opt(bdev));
545 case BLKALIGNOFF:
546 return put_int(argp, bdev_alignment_offset(bdev));
547 case BLKDISCARDZEROES:
548 return put_uint(argp, 0);
549 case BLKSECTGET:
550 max_sectors = min_t(unsigned int, USHRT_MAX,
551 queue_max_sectors(bdev_get_queue(bdev)));
552 return put_ushort(argp, max_sectors);
553 case BLKROTATIONAL:
554 return put_ushort(argp, !bdev_nonrot(bdev));
555 case BLKRASET:
556 case BLKFRASET:
557 if(!capable(CAP_SYS_ADMIN))
558 return -EACCES;
559 bdev->bd_disk->bdi->ra_pages = (arg * 512) / PAGE_SIZE;
560 return 0;
561 case BLKRRPART:
562 if (!capable(CAP_SYS_ADMIN))
563 return -EACCES;
564 if (bdev_is_partition(bdev))
565 return -EINVAL;
566 return disk_scan_partitions(bdev->bd_disk,
567 mode | BLK_OPEN_STRICT_SCAN);
568 case BLKTRACESTART:
569 case BLKTRACESTOP:
570 case BLKTRACETEARDOWN:
571 return blk_trace_ioctl(bdev, cmd, argp);
572 case IOC_PR_REGISTER:
573 return blkdev_pr_register(bdev, mode, argp);
574 case IOC_PR_RESERVE:
575 return blkdev_pr_reserve(bdev, mode, argp);
576 case IOC_PR_RELEASE:
577 return blkdev_pr_release(bdev, mode, argp);
578 case IOC_PR_PREEMPT:
579 return blkdev_pr_preempt(bdev, mode, argp, false);
580 case IOC_PR_PREEMPT_ABORT:
581 return blkdev_pr_preempt(bdev, mode, argp, true);
582 case IOC_PR_CLEAR:
583 return blkdev_pr_clear(bdev, mode, argp);
584 default:
585 return -ENOIOCTLCMD;
586 }
587}
588
589/*
590 * Always keep this in sync with compat_blkdev_ioctl()
591 * to handle all incompatible commands in both functions.
592 *
593 * New commands must be compatible and go into blkdev_common_ioctl
594 */
595long blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
596{
597 struct block_device *bdev = I_BDEV(file->f_mapping->host);
598 void __user *argp = (void __user *)arg;
599 blk_mode_t mode = file_to_blk_mode(file);
600 int ret;
601
602 switch (cmd) {
603 /* These need separate implementations for the data structure */
604 case HDIO_GETGEO:
605 return blkdev_getgeo(bdev, argp);
606 case BLKPG:
607 return blkpg_ioctl(bdev, argp);
608
609 /* Compat mode returns 32-bit data instead of 'long' */
610 case BLKRAGET:
611 case BLKFRAGET:
612 if (!argp)
613 return -EINVAL;
614 return put_long(argp,
615 (bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512);
616 case BLKGETSIZE:
617 if (bdev_nr_sectors(bdev) > ~0UL)
618 return -EFBIG;
619 return put_ulong(argp, bdev_nr_sectors(bdev));
620
621 /* The data is compatible, but the command number is different */
622 case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
623 return put_int(argp, block_size(bdev));
624 case BLKBSZSET:
625 return blkdev_bszset(bdev, mode, argp);
626 case BLKGETSIZE64:
627 return put_u64(argp, bdev_nr_bytes(bdev));
628
629 /* Incompatible alignment on i386 */
630 case BLKTRACESETUP:
631 return blk_trace_ioctl(bdev, cmd, argp);
632 default:
633 break;
634 }
635
636 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
637 if (ret != -ENOIOCTLCMD)
638 return ret;
639
640 if (!bdev->bd_disk->fops->ioctl)
641 return -ENOTTY;
642 return bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg);
643}
644
645#ifdef CONFIG_COMPAT
646
647#define BLKBSZGET_32 _IOR(0x12, 112, int)
648#define BLKBSZSET_32 _IOW(0x12, 113, int)
649#define BLKGETSIZE64_32 _IOR(0x12, 114, int)
650
651/* Most of the generic ioctls are handled in the normal fallback path.
652 This assumes the blkdev's low level compat_ioctl always returns
653 ENOIOCTLCMD for unknown ioctls. */
654long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
655{
656 int ret;
657 void __user *argp = compat_ptr(arg);
658 struct block_device *bdev = I_BDEV(file->f_mapping->host);
659 struct gendisk *disk = bdev->bd_disk;
660 blk_mode_t mode = file_to_blk_mode(file);
661
662 switch (cmd) {
663 /* These need separate implementations for the data structure */
664 case HDIO_GETGEO:
665 return compat_hdio_getgeo(bdev, argp);
666 case BLKPG:
667 return compat_blkpg_ioctl(bdev, argp);
668
669 /* Compat mode returns 32-bit data instead of 'long' */
670 case BLKRAGET:
671 case BLKFRAGET:
672 if (!argp)
673 return -EINVAL;
674 return compat_put_long(argp,
675 (bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512);
676 case BLKGETSIZE:
677 if (bdev_nr_sectors(bdev) > ~(compat_ulong_t)0)
678 return -EFBIG;
679 return compat_put_ulong(argp, bdev_nr_sectors(bdev));
680
681 /* The data is compatible, but the command number is different */
682 case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
683 return put_int(argp, bdev_logical_block_size(bdev));
684 case BLKBSZSET_32:
685 return blkdev_bszset(bdev, mode, argp);
686 case BLKGETSIZE64_32:
687 return put_u64(argp, bdev_nr_bytes(bdev));
688
689 /* Incompatible alignment on i386 */
690 case BLKTRACESETUP32:
691 return blk_trace_ioctl(bdev, cmd, argp);
692 default:
693 break;
694 }
695
696 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
697 if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
698 ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
699
700 return ret;
701}
702#endif