xref: /openbmc/linux/block/ioctl.c (revision 2ae2e7cf) 
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 
16 static 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;
22 
23 	if (disk->flags & GENHD_FL_NO_PART)
24 		return -EINVAL;
25 	if (!capable(CAP_SYS_ADMIN))
26 		return -EACCES;
27 	if (copy_from_user(&p, upart, sizeof(struct blkpg_partition)))
28 		return -EFAULT;
29 	if (bdev_is_partition(bdev))
30 		return -EINVAL;
31 
32 	if (p.pno <= 0)
33 		return -EINVAL;
34 
35 	if (op == BLKPG_DEL_PARTITION)
36 		return bdev_del_partition(disk, p.pno);
37 
38 	if (p.start < 0 || p.length <= 0 || p.start + p.length < 0)
39 		return -EINVAL;
40 	/* Check that the partition is aligned to the block size */
41 	if (!IS_ALIGNED(p.start | p.length, bdev_logical_block_size(bdev)))
42 		return -EINVAL;
43 
44 	start = p.start >> SECTOR_SHIFT;
45 	length = p.length >> SECTOR_SHIFT;
46 
47 	switch (op) {
48 	case BLKPG_ADD_PARTITION:
49 		return bdev_add_partition(disk, p.pno, start, length);
50 	case BLKPG_RESIZE_PARTITION:
51 		return bdev_resize_partition(disk, p.pno, start, length);
52 	default:
53 		return -EINVAL;
54 	}
55 }
56 
57 static int blkpg_ioctl(struct block_device *bdev,
58 		       struct blkpg_ioctl_arg __user *arg)
59 {
60 	struct blkpg_partition __user *udata;
61 	int op;
62 
63 	if (get_user(op, &arg->op) || get_user(udata, &arg->data))
64 		return -EFAULT;
65 
66 	return blkpg_do_ioctl(bdev, udata, op);
67 }
68 
69 #ifdef CONFIG_COMPAT
70 struct compat_blkpg_ioctl_arg {
71 	compat_int_t op;
72 	compat_int_t flags;
73 	compat_int_t datalen;
74 	compat_caddr_t data;
75 };
76 
77 static int compat_blkpg_ioctl(struct block_device *bdev,
78 			      struct compat_blkpg_ioctl_arg __user *arg)
79 {
80 	compat_caddr_t udata;
81 	int op;
82 
83 	if (get_user(op, &arg->op) || get_user(udata, &arg->data))
84 		return -EFAULT;
85 
86 	return blkpg_do_ioctl(bdev, compat_ptr(udata), op);
87 }
88 #endif
89 
90 static int blk_ioctl_discard(struct block_device *bdev, blk_mode_t mode,
91 		unsigned long arg)
92 {
93 	uint64_t range[2];
94 	uint64_t start, len;
95 	struct inode *inode = bdev->bd_inode;
96 	int err;
97 
98 	if (!(mode & BLK_OPEN_WRITE))
99 		return -EBADF;
100 
101 	if (!bdev_max_discard_sectors(bdev))
102 		return -EOPNOTSUPP;
103 
104 	if (copy_from_user(range, (void __user *)arg, sizeof(range)))
105 		return -EFAULT;
106 
107 	start = range[0];
108 	len = range[1];
109 
110 	if (start & 511)
111 		return -EINVAL;
112 	if (len & 511)
113 		return -EINVAL;
114 
115 	if (start + len > bdev_nr_bytes(bdev))
116 		return -EINVAL;
117 
118 	filemap_invalidate_lock(inode->i_mapping);
119 	err = truncate_bdev_range(bdev, mode, start, start + len - 1);
120 	if (err)
121 		goto fail;
122 	err = blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL);
123 fail:
124 	filemap_invalidate_unlock(inode->i_mapping);
125 	return err;
126 }
127 
128 static int blk_ioctl_secure_erase(struct block_device *bdev, blk_mode_t mode,
129 		void __user *argp)
130 {
131 	uint64_t start, len;
132 	uint64_t range[2];
133 	int err;
134 
135 	if (!(mode & BLK_OPEN_WRITE))
136 		return -EBADF;
137 	if (!bdev_max_secure_erase_sectors(bdev))
138 		return -EOPNOTSUPP;
139 	if (copy_from_user(range, argp, sizeof(range)))
140 		return -EFAULT;
141 
142 	start = range[0];
143 	len = range[1];
144 	if ((start & 511) || (len & 511))
145 		return -EINVAL;
146 	if (start + len > bdev_nr_bytes(bdev))
147 		return -EINVAL;
148 
149 	filemap_invalidate_lock(bdev->bd_inode->i_mapping);
150 	err = truncate_bdev_range(bdev, mode, start, start + len - 1);
151 	if (!err)
152 		err = blkdev_issue_secure_erase(bdev, start >> 9, len >> 9,
153 						GFP_KERNEL);
154 	filemap_invalidate_unlock(bdev->bd_inode->i_mapping);
155 	return err;
156 }
157 
158 
159 static int blk_ioctl_zeroout(struct block_device *bdev, blk_mode_t mode,
160 		unsigned long arg)
161 {
162 	uint64_t range[2];
163 	uint64_t start, end, len;
164 	struct inode *inode = bdev->bd_inode;
165 	int err;
166 
167 	if (!(mode & BLK_OPEN_WRITE))
168 		return -EBADF;
169 
170 	if (copy_from_user(range, (void __user *)arg, sizeof(range)))
171 		return -EFAULT;
172 
173 	start = range[0];
174 	len = range[1];
175 	end = start + len - 1;
176 
177 	if (start & 511)
178 		return -EINVAL;
179 	if (len & 511)
180 		return -EINVAL;
181 	if (end >= (uint64_t)bdev_nr_bytes(bdev))
182 		return -EINVAL;
183 	if (end < start)
184 		return -EINVAL;
185 
186 	/* Invalidate the page cache, including dirty pages */
187 	filemap_invalidate_lock(inode->i_mapping);
188 	err = truncate_bdev_range(bdev, mode, start, end);
189 	if (err)
190 		goto fail;
191 
192 	err = blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL,
193 				   BLKDEV_ZERO_NOUNMAP);
194 
195 fail:
196 	filemap_invalidate_unlock(inode->i_mapping);
197 	return err;
198 }
199 
200 static int put_ushort(unsigned short __user *argp, unsigned short val)
201 {
202 	return put_user(val, argp);
203 }
204 
205 static int put_int(int __user *argp, int val)
206 {
207 	return put_user(val, argp);
208 }
209 
210 static int put_uint(unsigned int __user *argp, unsigned int val)
211 {
212 	return put_user(val, argp);
213 }
214 
215 static int put_long(long __user *argp, long val)
216 {
217 	return put_user(val, argp);
218 }
219 
220 static int put_ulong(unsigned long __user *argp, unsigned long val)
221 {
222 	return put_user(val, argp);
223 }
224 
225 static int put_u64(u64 __user *argp, u64 val)
226 {
227 	return put_user(val, argp);
228 }
229 
230 #ifdef CONFIG_COMPAT
231 static int compat_put_long(compat_long_t __user *argp, long val)
232 {
233 	return put_user(val, argp);
234 }
235 
236 static int compat_put_ulong(compat_ulong_t __user *argp, compat_ulong_t val)
237 {
238 	return put_user(val, argp);
239 }
240 #endif
241 
242 #ifdef CONFIG_COMPAT
243 /*
244  * This is the equivalent of compat_ptr_ioctl(), to be used by block
245  * drivers that implement only commands that are completely compatible
246  * between 32-bit and 64-bit user space
247  */
248 int blkdev_compat_ptr_ioctl(struct block_device *bdev, blk_mode_t mode,
249 			unsigned cmd, unsigned long arg)
250 {
251 	struct gendisk *disk = bdev->bd_disk;
252 
253 	if (disk->fops->ioctl)
254 		return disk->fops->ioctl(bdev, mode, cmd,
255 					 (unsigned long)compat_ptr(arg));
256 
257 	return -ENOIOCTLCMD;
258 }
259 EXPORT_SYMBOL(blkdev_compat_ptr_ioctl);
260 #endif
261 
262 static bool blkdev_pr_allowed(struct block_device *bdev, blk_mode_t mode)
263 {
264 	/* no sense to make reservations for partitions */
265 	if (bdev_is_partition(bdev))
266 		return false;
267 
268 	if (capable(CAP_SYS_ADMIN))
269 		return true;
270 	/*
271 	 * Only allow unprivileged reservations if the file descriptor is open
272 	 * for writing.
273 	 */
274 	return mode & BLK_OPEN_WRITE;
275 }
276 
277 static int blkdev_pr_register(struct block_device *bdev, blk_mode_t mode,
278 		struct pr_registration __user *arg)
279 {
280 	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
281 	struct pr_registration reg;
282 
283 	if (!blkdev_pr_allowed(bdev, mode))
284 		return -EPERM;
285 	if (!ops || !ops->pr_register)
286 		return -EOPNOTSUPP;
287 	if (copy_from_user(&reg, arg, sizeof(reg)))
288 		return -EFAULT;
289 
290 	if (reg.flags & ~PR_FL_IGNORE_KEY)
291 		return -EOPNOTSUPP;
292 	return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags);
293 }
294 
295 static int blkdev_pr_reserve(struct block_device *bdev, blk_mode_t mode,
296 		struct pr_reservation __user *arg)
297 {
298 	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
299 	struct pr_reservation rsv;
300 
301 	if (!blkdev_pr_allowed(bdev, mode))
302 		return -EPERM;
303 	if (!ops || !ops->pr_reserve)
304 		return -EOPNOTSUPP;
305 	if (copy_from_user(&rsv, arg, sizeof(rsv)))
306 		return -EFAULT;
307 
308 	if (rsv.flags & ~PR_FL_IGNORE_KEY)
309 		return -EOPNOTSUPP;
310 	return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags);
311 }
312 
313 static int blkdev_pr_release(struct block_device *bdev, blk_mode_t mode,
314 		struct pr_reservation __user *arg)
315 {
316 	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
317 	struct pr_reservation rsv;
318 
319 	if (!blkdev_pr_allowed(bdev, mode))
320 		return -EPERM;
321 	if (!ops || !ops->pr_release)
322 		return -EOPNOTSUPP;
323 	if (copy_from_user(&rsv, arg, sizeof(rsv)))
324 		return -EFAULT;
325 
326 	if (rsv.flags)
327 		return -EOPNOTSUPP;
328 	return ops->pr_release(bdev, rsv.key, rsv.type);
329 }
330 
331 static int blkdev_pr_preempt(struct block_device *bdev, blk_mode_t mode,
332 		struct pr_preempt __user *arg, bool abort)
333 {
334 	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
335 	struct pr_preempt p;
336 
337 	if (!blkdev_pr_allowed(bdev, mode))
338 		return -EPERM;
339 	if (!ops || !ops->pr_preempt)
340 		return -EOPNOTSUPP;
341 	if (copy_from_user(&p, arg, sizeof(p)))
342 		return -EFAULT;
343 
344 	if (p.flags)
345 		return -EOPNOTSUPP;
346 	return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort);
347 }
348 
349 static int blkdev_pr_clear(struct block_device *bdev, blk_mode_t mode,
350 		struct pr_clear __user *arg)
351 {
352 	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
353 	struct pr_clear c;
354 
355 	if (!blkdev_pr_allowed(bdev, mode))
356 		return -EPERM;
357 	if (!ops || !ops->pr_clear)
358 		return -EOPNOTSUPP;
359 	if (copy_from_user(&c, arg, sizeof(c)))
360 		return -EFAULT;
361 
362 	if (c.flags)
363 		return -EOPNOTSUPP;
364 	return ops->pr_clear(bdev, c.key);
365 }
366 
367 static int blkdev_flushbuf(struct block_device *bdev, unsigned cmd,
368 		unsigned long arg)
369 {
370 	if (!capable(CAP_SYS_ADMIN))
371 		return -EACCES;
372 
373 	mutex_lock(&bdev->bd_holder_lock);
374 	if (bdev->bd_holder_ops && bdev->bd_holder_ops->sync)
375 		bdev->bd_holder_ops->sync(bdev);
376 	else
377 		sync_blockdev(bdev);
378 	mutex_unlock(&bdev->bd_holder_lock);
379 
380 	invalidate_bdev(bdev);
381 	return 0;
382 }
383 
384 static int blkdev_roset(struct block_device *bdev, unsigned cmd,
385 		unsigned long arg)
386 {
387 	int ret, n;
388 
389 	if (!capable(CAP_SYS_ADMIN))
390 		return -EACCES;
391 
392 	if (get_user(n, (int __user *)arg))
393 		return -EFAULT;
394 	if (bdev->bd_disk->fops->set_read_only) {
395 		ret = bdev->bd_disk->fops->set_read_only(bdev, n);
396 		if (ret)
397 			return ret;
398 	}
399 	bdev->bd_read_only = n;
400 	return 0;
401 }
402 
403 static int blkdev_getgeo(struct block_device *bdev,
404 		struct hd_geometry __user *argp)
405 {
406 	struct gendisk *disk = bdev->bd_disk;
407 	struct hd_geometry geo;
408 	int ret;
409 
410 	if (!argp)
411 		return -EINVAL;
412 	if (!disk->fops->getgeo)
413 		return -ENOTTY;
414 
415 	/*
416 	 * We need to set the startsect first, the driver may
417 	 * want to override it.
418 	 */
419 	memset(&geo, 0, sizeof(geo));
420 	geo.start = get_start_sect(bdev);
421 	ret = disk->fops->getgeo(bdev, &geo);
422 	if (ret)
423 		return ret;
424 	if (copy_to_user(argp, &geo, sizeof(geo)))
425 		return -EFAULT;
426 	return 0;
427 }
428 
429 #ifdef CONFIG_COMPAT
430 struct compat_hd_geometry {
431 	unsigned char heads;
432 	unsigned char sectors;
433 	unsigned short cylinders;
434 	u32 start;
435 };
436 
437 static int compat_hdio_getgeo(struct block_device *bdev,
438 			      struct compat_hd_geometry __user *ugeo)
439 {
440 	struct gendisk *disk = bdev->bd_disk;
441 	struct hd_geometry geo;
442 	int ret;
443 
444 	if (!ugeo)
445 		return -EINVAL;
446 	if (!disk->fops->getgeo)
447 		return -ENOTTY;
448 
449 	memset(&geo, 0, sizeof(geo));
450 	/*
451 	 * We need to set the startsect first, the driver may
452 	 * want to override it.
453 	 */
454 	geo.start = get_start_sect(bdev);
455 	ret = disk->fops->getgeo(bdev, &geo);
456 	if (ret)
457 		return ret;
458 
459 	ret = copy_to_user(ugeo, &geo, 4);
460 	ret |= put_user(geo.start, &ugeo->start);
461 	if (ret)
462 		ret = -EFAULT;
463 
464 	return ret;
465 }
466 #endif
467 
468 /* set the logical block size */
469 static int blkdev_bszset(struct block_device *bdev, blk_mode_t mode,
470 		int __user *argp)
471 {
472 	int ret, n;
473 
474 	if (!capable(CAP_SYS_ADMIN))
475 		return -EACCES;
476 	if (!argp)
477 		return -EINVAL;
478 	if (get_user(n, argp))
479 		return -EFAULT;
480 
481 	if (mode & BLK_OPEN_EXCL)
482 		return set_blocksize(bdev, n);
483 
484 	if (IS_ERR(blkdev_get_by_dev(bdev->bd_dev, mode, &bdev, NULL)))
485 		return -EBUSY;
486 	ret = set_blocksize(bdev, n);
487 	blkdev_put(bdev, &bdev);
488 
489 	return ret;
490 }
491 
492 /*
493  * Common commands that are handled the same way on native and compat
494  * user space. Note the separate arg/argp parameters that are needed
495  * to deal with the compat_ptr() conversion.
496  */
497 static int blkdev_common_ioctl(struct block_device *bdev, blk_mode_t mode,
498 			       unsigned int cmd, unsigned long arg,
499 			       void __user *argp)
500 {
501 	unsigned int max_sectors;
502 
503 	switch (cmd) {
504 	case BLKFLSBUF:
505 		return blkdev_flushbuf(bdev, cmd, arg);
506 	case BLKROSET:
507 		return blkdev_roset(bdev, cmd, arg);
508 	case BLKDISCARD:
509 		return blk_ioctl_discard(bdev, mode, arg);
510 	case BLKSECDISCARD:
511 		return blk_ioctl_secure_erase(bdev, mode, argp);
512 	case BLKZEROOUT:
513 		return blk_ioctl_zeroout(bdev, mode, arg);
514 	case BLKGETDISKSEQ:
515 		return put_u64(argp, bdev->bd_disk->diskseq);
516 	case BLKREPORTZONE:
517 		return blkdev_report_zones_ioctl(bdev, cmd, arg);
518 	case BLKRESETZONE:
519 	case BLKOPENZONE:
520 	case BLKCLOSEZONE:
521 	case BLKFINISHZONE:
522 		return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg);
523 	case BLKGETZONESZ:
524 		return put_uint(argp, bdev_zone_sectors(bdev));
525 	case BLKGETNRZONES:
526 		return put_uint(argp, bdev_nr_zones(bdev));
527 	case BLKROGET:
528 		return put_int(argp, bdev_read_only(bdev) != 0);
529 	case BLKSSZGET: /* get block device logical block size */
530 		return put_int(argp, bdev_logical_block_size(bdev));
531 	case BLKPBSZGET: /* get block device physical block size */
532 		return put_uint(argp, bdev_physical_block_size(bdev));
533 	case BLKIOMIN:
534 		return put_uint(argp, bdev_io_min(bdev));
535 	case BLKIOOPT:
536 		return put_uint(argp, bdev_io_opt(bdev));
537 	case BLKALIGNOFF:
538 		return put_int(argp, bdev_alignment_offset(bdev));
539 	case BLKDISCARDZEROES:
540 		return put_uint(argp, 0);
541 	case BLKSECTGET:
542 		max_sectors = min_t(unsigned int, USHRT_MAX,
543 				    queue_max_sectors(bdev_get_queue(bdev)));
544 		return put_ushort(argp, max_sectors);
545 	case BLKROTATIONAL:
546 		return put_ushort(argp, !bdev_nonrot(bdev));
547 	case BLKRASET:
548 	case BLKFRASET:
549 		if(!capable(CAP_SYS_ADMIN))
550 			return -EACCES;
551 		bdev->bd_disk->bdi->ra_pages = (arg * 512) / PAGE_SIZE;
552 		return 0;
553 	case BLKRRPART:
554 		if (!capable(CAP_SYS_ADMIN))
555 			return -EACCES;
556 		if (bdev_is_partition(bdev))
557 			return -EINVAL;
558 		return disk_scan_partitions(bdev->bd_disk, mode);
559 	case BLKTRACESTART:
560 	case BLKTRACESTOP:
561 	case BLKTRACETEARDOWN:
562 		return blk_trace_ioctl(bdev, cmd, argp);
563 	case IOC_PR_REGISTER:
564 		return blkdev_pr_register(bdev, mode, argp);
565 	case IOC_PR_RESERVE:
566 		return blkdev_pr_reserve(bdev, mode, argp);
567 	case IOC_PR_RELEASE:
568 		return blkdev_pr_release(bdev, mode, argp);
569 	case IOC_PR_PREEMPT:
570 		return blkdev_pr_preempt(bdev, mode, argp, false);
571 	case IOC_PR_PREEMPT_ABORT:
572 		return blkdev_pr_preempt(bdev, mode, argp, true);
573 	case IOC_PR_CLEAR:
574 		return blkdev_pr_clear(bdev, mode, argp);
575 	default:
576 		return -ENOIOCTLCMD;
577 	}
578 }
579 
580 /*
581  * Always keep this in sync with compat_blkdev_ioctl()
582  * to handle all incompatible commands in both functions.
583  *
584  * New commands must be compatible and go into blkdev_common_ioctl
585  */
586 long blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
587 {
588 	struct block_device *bdev = I_BDEV(file->f_mapping->host);
589 	void __user *argp = (void __user *)arg;
590 	blk_mode_t mode = file_to_blk_mode(file);
591 	int ret;
592 
593 	switch (cmd) {
594 	/* These need separate implementations for the data structure */
595 	case HDIO_GETGEO:
596 		return blkdev_getgeo(bdev, argp);
597 	case BLKPG:
598 		return blkpg_ioctl(bdev, argp);
599 
600 	/* Compat mode returns 32-bit data instead of 'long' */
601 	case BLKRAGET:
602 	case BLKFRAGET:
603 		if (!argp)
604 			return -EINVAL;
605 		return put_long(argp,
606 			(bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512);
607 	case BLKGETSIZE:
608 		if (bdev_nr_sectors(bdev) > ~0UL)
609 			return -EFBIG;
610 		return put_ulong(argp, bdev_nr_sectors(bdev));
611 
612 	/* The data is compatible, but the command number is different */
613 	case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
614 		return put_int(argp, block_size(bdev));
615 	case BLKBSZSET:
616 		return blkdev_bszset(bdev, mode, argp);
617 	case BLKGETSIZE64:
618 		return put_u64(argp, bdev_nr_bytes(bdev));
619 
620 	/* Incompatible alignment on i386 */
621 	case BLKTRACESETUP:
622 		return blk_trace_ioctl(bdev, cmd, argp);
623 	default:
624 		break;
625 	}
626 
627 	ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
628 	if (ret != -ENOIOCTLCMD)
629 		return ret;
630 
631 	if (!bdev->bd_disk->fops->ioctl)
632 		return -ENOTTY;
633 	return bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg);
634 }
635 
636 #ifdef CONFIG_COMPAT
637 
638 #define BLKBSZGET_32		_IOR(0x12, 112, int)
639 #define BLKBSZSET_32		_IOW(0x12, 113, int)
640 #define BLKGETSIZE64_32		_IOR(0x12, 114, int)
641 
642 /* Most of the generic ioctls are handled in the normal fallback path.
643    This assumes the blkdev's low level compat_ioctl always returns
644    ENOIOCTLCMD for unknown ioctls. */
645 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
646 {
647 	int ret;
648 	void __user *argp = compat_ptr(arg);
649 	struct block_device *bdev = I_BDEV(file->f_mapping->host);
650 	struct gendisk *disk = bdev->bd_disk;
651 	blk_mode_t mode = file_to_blk_mode(file);
652 
653 	switch (cmd) {
654 	/* These need separate implementations for the data structure */
655 	case HDIO_GETGEO:
656 		return compat_hdio_getgeo(bdev, argp);
657 	case BLKPG:
658 		return compat_blkpg_ioctl(bdev, argp);
659 
660 	/* Compat mode returns 32-bit data instead of 'long' */
661 	case BLKRAGET:
662 	case BLKFRAGET:
663 		if (!argp)
664 			return -EINVAL;
665 		return compat_put_long(argp,
666 			(bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512);
667 	case BLKGETSIZE:
668 		if (bdev_nr_sectors(bdev) > ~(compat_ulong_t)0)
669 			return -EFBIG;
670 		return compat_put_ulong(argp, bdev_nr_sectors(bdev));
671 
672 	/* The data is compatible, but the command number is different */
673 	case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
674 		return put_int(argp, bdev_logical_block_size(bdev));
675 	case BLKBSZSET_32:
676 		return blkdev_bszset(bdev, mode, argp);
677 	case BLKGETSIZE64_32:
678 		return put_u64(argp, bdev_nr_bytes(bdev));
679 
680 	/* Incompatible alignment on i386 */
681 	case BLKTRACESETUP32:
682 		return blk_trace_ioctl(bdev, cmd, argp);
683 	default:
684 		break;
685 	}
686 
687 	ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
688 	if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
689 		ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
690 
691 	return ret;
692 }
693 #endif
694