xref: /openbmc/linux/block/ioctl.c (revision 173940b3) 
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 	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 
52 static 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
65 struct 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 
72 static 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 
85 static 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);
118 fail:
119 	filemap_invalidate_unlock(inode->i_mapping);
120 	return err;
121 }
122 
123 static 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 
154 static 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 
190 fail:
191 	filemap_invalidate_unlock(inode->i_mapping);
192 	return err;
193 }
194 
195 static int put_ushort(unsigned short __user *argp, unsigned short val)
196 {
197 	return put_user(val, argp);
198 }
199 
200 static int put_int(int __user *argp, int val)
201 {
202 	return put_user(val, argp);
203 }
204 
205 static int put_uint(unsigned int __user *argp, unsigned int val)
206 {
207 	return put_user(val, argp);
208 }
209 
210 static int put_long(long __user *argp, long val)
211 {
212 	return put_user(val, argp);
213 }
214 
215 static int put_ulong(unsigned long __user *argp, unsigned long val)
216 {
217 	return put_user(val, argp);
218 }
219 
220 static int put_u64(u64 __user *argp, u64 val)
221 {
222 	return put_user(val, argp);
223 }
224 
225 #ifdef CONFIG_COMPAT
226 static int compat_put_long(compat_long_t __user *argp, long val)
227 {
228 	return put_user(val, argp);
229 }
230 
231 static 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  */
243 int 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 }
254 EXPORT_SYMBOL(blkdev_compat_ptr_ioctl);
255 #endif
256 
257 static 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(&reg, 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 
275 static 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 
293 static 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 
311 static 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 
329 static 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 
347 static 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 
357 static 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 
376 static 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
403 struct compat_hd_geometry {
404 	unsigned char heads;
405 	unsigned char sectors;
406 	unsigned short cylinders;
407 	u32 start;
408 };
409 
410 static 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 */
442 static 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  */
470 static int blkdev_common_ioctl(struct block_device *bdev, fmode_t mode,
471 				unsigned cmd, unsigned long arg, void __user *argp)
472 {
473 	unsigned int max_sectors;
474 
475 	switch (cmd) {
476 	case BLKFLSBUF:
477 		return blkdev_flushbuf(bdev, mode, cmd, arg);
478 	case BLKROSET:
479 		return blkdev_roset(bdev, mode, cmd, arg);
480 	case BLKDISCARD:
481 		return blk_ioctl_discard(bdev, mode, arg);
482 	case BLKSECDISCARD:
483 		return blk_ioctl_secure_erase(bdev, mode, argp);
484 	case BLKZEROOUT:
485 		return blk_ioctl_zeroout(bdev, mode, arg);
486 	case BLKGETDISKSEQ:
487 		return put_u64(argp, bdev->bd_disk->diskseq);
488 	case BLKREPORTZONE:
489 		return blkdev_report_zones_ioctl(bdev, mode, cmd, arg);
490 	case BLKRESETZONE:
491 	case BLKOPENZONE:
492 	case BLKCLOSEZONE:
493 	case BLKFINISHZONE:
494 		return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg);
495 	case BLKGETZONESZ:
496 		return put_uint(argp, bdev_zone_sectors(bdev));
497 	case BLKGETNRZONES:
498 		return put_uint(argp, blkdev_nr_zones(bdev->bd_disk));
499 	case BLKROGET:
500 		return put_int(argp, bdev_read_only(bdev) != 0);
501 	case BLKSSZGET: /* get block device logical block size */
502 		return put_int(argp, bdev_logical_block_size(bdev));
503 	case BLKPBSZGET: /* get block device physical block size */
504 		return put_uint(argp, bdev_physical_block_size(bdev));
505 	case BLKIOMIN:
506 		return put_uint(argp, bdev_io_min(bdev));
507 	case BLKIOOPT:
508 		return put_uint(argp, bdev_io_opt(bdev));
509 	case BLKALIGNOFF:
510 		return put_int(argp, bdev_alignment_offset(bdev));
511 	case BLKDISCARDZEROES:
512 		return put_uint(argp, 0);
513 	case BLKSECTGET:
514 		max_sectors = min_t(unsigned int, USHRT_MAX,
515 				    queue_max_sectors(bdev_get_queue(bdev)));
516 		return put_ushort(argp, max_sectors);
517 	case BLKROTATIONAL:
518 		return put_ushort(argp, !bdev_nonrot(bdev));
519 	case BLKRASET:
520 	case BLKFRASET:
521 		if(!capable(CAP_SYS_ADMIN))
522 			return -EACCES;
523 		bdev->bd_disk->bdi->ra_pages = (arg * 512) / PAGE_SIZE;
524 		return 0;
525 	case BLKRRPART:
526 		if (!capable(CAP_SYS_ADMIN))
527 			return -EACCES;
528 		if (bdev_is_partition(bdev))
529 			return -EINVAL;
530 		return disk_scan_partitions(bdev->bd_disk, mode & ~FMODE_EXCL);
531 	case BLKTRACESTART:
532 	case BLKTRACESTOP:
533 	case BLKTRACETEARDOWN:
534 		return blk_trace_ioctl(bdev, cmd, argp);
535 	case IOC_PR_REGISTER:
536 		return blkdev_pr_register(bdev, argp);
537 	case IOC_PR_RESERVE:
538 		return blkdev_pr_reserve(bdev, argp);
539 	case IOC_PR_RELEASE:
540 		return blkdev_pr_release(bdev, argp);
541 	case IOC_PR_PREEMPT:
542 		return blkdev_pr_preempt(bdev, argp, false);
543 	case IOC_PR_PREEMPT_ABORT:
544 		return blkdev_pr_preempt(bdev, argp, true);
545 	case IOC_PR_CLEAR:
546 		return blkdev_pr_clear(bdev, argp);
547 	default:
548 		return -ENOIOCTLCMD;
549 	}
550 }
551 
552 /*
553  * Always keep this in sync with compat_blkdev_ioctl()
554  * to handle all incompatible commands in both functions.
555  *
556  * New commands must be compatible and go into blkdev_common_ioctl
557  */
558 long blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
559 {
560 	struct block_device *bdev = I_BDEV(file->f_mapping->host);
561 	void __user *argp = (void __user *)arg;
562 	fmode_t mode = file->f_mode;
563 	int ret;
564 
565 	/*
566 	 * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
567 	 * to updated it before every ioctl.
568 	 */
569 	if (file->f_flags & O_NDELAY)
570 		mode |= FMODE_NDELAY;
571 	else
572 		mode &= ~FMODE_NDELAY;
573 
574 	switch (cmd) {
575 	/* These need separate implementations for the data structure */
576 	case HDIO_GETGEO:
577 		return blkdev_getgeo(bdev, argp);
578 	case BLKPG:
579 		return blkpg_ioctl(bdev, argp);
580 
581 	/* Compat mode returns 32-bit data instead of 'long' */
582 	case BLKRAGET:
583 	case BLKFRAGET:
584 		if (!argp)
585 			return -EINVAL;
586 		return put_long(argp,
587 			(bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512);
588 	case BLKGETSIZE:
589 		if (bdev_nr_sectors(bdev) > ~0UL)
590 			return -EFBIG;
591 		return put_ulong(argp, bdev_nr_sectors(bdev));
592 
593 	/* The data is compatible, but the command number is different */
594 	case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
595 		return put_int(argp, block_size(bdev));
596 	case BLKBSZSET:
597 		return blkdev_bszset(bdev, mode, argp);
598 	case BLKGETSIZE64:
599 		return put_u64(argp, bdev_nr_bytes(bdev));
600 
601 	/* Incompatible alignment on i386 */
602 	case BLKTRACESETUP:
603 		return blk_trace_ioctl(bdev, cmd, argp);
604 	default:
605 		break;
606 	}
607 
608 	ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
609 	if (ret != -ENOIOCTLCMD)
610 		return ret;
611 
612 	if (!bdev->bd_disk->fops->ioctl)
613 		return -ENOTTY;
614 	return bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg);
615 }
616 
617 #ifdef CONFIG_COMPAT
618 
619 #define BLKBSZGET_32		_IOR(0x12, 112, int)
620 #define BLKBSZSET_32		_IOW(0x12, 113, int)
621 #define BLKGETSIZE64_32		_IOR(0x12, 114, int)
622 
623 /* Most of the generic ioctls are handled in the normal fallback path.
624    This assumes the blkdev's low level compat_ioctl always returns
625    ENOIOCTLCMD for unknown ioctls. */
626 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
627 {
628 	int ret;
629 	void __user *argp = compat_ptr(arg);
630 	struct block_device *bdev = I_BDEV(file->f_mapping->host);
631 	struct gendisk *disk = bdev->bd_disk;
632 	fmode_t mode = file->f_mode;
633 
634 	/*
635 	 * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
636 	 * to updated it before every ioctl.
637 	 */
638 	if (file->f_flags & O_NDELAY)
639 		mode |= FMODE_NDELAY;
640 	else
641 		mode &= ~FMODE_NDELAY;
642 
643 	switch (cmd) {
644 	/* These need separate implementations for the data structure */
645 	case HDIO_GETGEO:
646 		return compat_hdio_getgeo(bdev, argp);
647 	case BLKPG:
648 		return compat_blkpg_ioctl(bdev, argp);
649 
650 	/* Compat mode returns 32-bit data instead of 'long' */
651 	case BLKRAGET:
652 	case BLKFRAGET:
653 		if (!argp)
654 			return -EINVAL;
655 		return compat_put_long(argp,
656 			(bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512);
657 	case BLKGETSIZE:
658 		if (bdev_nr_sectors(bdev) > ~(compat_ulong_t)0)
659 			return -EFBIG;
660 		return compat_put_ulong(argp, bdev_nr_sectors(bdev));
661 
662 	/* The data is compatible, but the command number is different */
663 	case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
664 		return put_int(argp, bdev_logical_block_size(bdev));
665 	case BLKBSZSET_32:
666 		return blkdev_bszset(bdev, mode, argp);
667 	case BLKGETSIZE64_32:
668 		return put_u64(argp, bdev_nr_bytes(bdev));
669 
670 	/* Incompatible alignment on i386 */
671 	case BLKTRACESETUP32:
672 		return blk_trace_ioctl(bdev, cmd, argp);
673 	default:
674 		break;
675 	}
676 
677 	ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
678 	if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
679 		ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
680 
681 	return ret;
682 }
683 #endif
684