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