xref: /linux/block/ioctl.c (revision d6fd48ef) 
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 int cmd, unsigned long arg,
472 			       void __user *argp)
473 {
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);
532 	case BLKTRACESTART:
533 	case BLKTRACESTOP:
534 	case BLKTRACETEARDOWN:
535 		return blk_trace_ioctl(bdev, cmd, argp);
536 	case IOC_PR_REGISTER:
537 		return blkdev_pr_register(bdev, argp);
538 	case IOC_PR_RESERVE:
539 		return blkdev_pr_reserve(bdev, argp);
540 	case IOC_PR_RELEASE:
541 		return blkdev_pr_release(bdev, argp);
542 	case IOC_PR_PREEMPT:
543 		return blkdev_pr_preempt(bdev, argp, false);
544 	case IOC_PR_PREEMPT_ABORT:
545 		return blkdev_pr_preempt(bdev, argp, true);
546 	case IOC_PR_CLEAR:
547 		return blkdev_pr_clear(bdev, argp);
548 	default:
549 		return -ENOIOCTLCMD;
550 	}
551 }
552 
553 /*
554  * Always keep this in sync with compat_blkdev_ioctl()
555  * to handle all incompatible commands in both functions.
556  *
557  * New commands must be compatible and go into blkdev_common_ioctl
558  */
559 long blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
560 {
561 	struct block_device *bdev = I_BDEV(file->f_mapping->host);
562 	void __user *argp = (void __user *)arg;
563 	fmode_t mode = file->f_mode;
564 	int ret;
565 
566 	/*
567 	 * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
568 	 * to updated it before every ioctl.
569 	 */
570 	if (file->f_flags & O_NDELAY)
571 		mode |= FMODE_NDELAY;
572 	else
573 		mode &= ~FMODE_NDELAY;
574 
575 	switch (cmd) {
576 	/* These need separate implementations for the data structure */
577 	case HDIO_GETGEO:
578 		return blkdev_getgeo(bdev, argp);
579 	case BLKPG:
580 		return blkpg_ioctl(bdev, argp);
581 
582 	/* Compat mode returns 32-bit data instead of 'long' */
583 	case BLKRAGET:
584 	case BLKFRAGET:
585 		if (!argp)
586 			return -EINVAL;
587 		return put_long(argp,
588 			(bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512);
589 	case BLKGETSIZE:
590 		if (bdev_nr_sectors(bdev) > ~0UL)
591 			return -EFBIG;
592 		return put_ulong(argp, bdev_nr_sectors(bdev));
593 
594 	/* The data is compatible, but the command number is different */
595 	case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
596 		return put_int(argp, block_size(bdev));
597 	case BLKBSZSET:
598 		return blkdev_bszset(bdev, mode, argp);
599 	case BLKGETSIZE64:
600 		return put_u64(argp, bdev_nr_bytes(bdev));
601 
602 	/* Incompatible alignment on i386 */
603 	case BLKTRACESETUP:
604 		return blk_trace_ioctl(bdev, cmd, argp);
605 	default:
606 		break;
607 	}
608 
609 	ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
610 	if (ret != -ENOIOCTLCMD)
611 		return ret;
612 
613 	if (!bdev->bd_disk->fops->ioctl)
614 		return -ENOTTY;
615 	return bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg);
616 }
617 
618 #ifdef CONFIG_COMPAT
619 
620 #define BLKBSZGET_32		_IOR(0x12, 112, int)
621 #define BLKBSZSET_32		_IOW(0x12, 113, int)
622 #define BLKGETSIZE64_32		_IOR(0x12, 114, int)
623 
624 /* Most of the generic ioctls are handled in the normal fallback path.
625    This assumes the blkdev's low level compat_ioctl always returns
626    ENOIOCTLCMD for unknown ioctls. */
627 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
628 {
629 	int ret;
630 	void __user *argp = compat_ptr(arg);
631 	struct block_device *bdev = I_BDEV(file->f_mapping->host);
632 	struct gendisk *disk = bdev->bd_disk;
633 	fmode_t mode = file->f_mode;
634 
635 	/*
636 	 * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
637 	 * to updated it before every ioctl.
638 	 */
639 	if (file->f_flags & O_NDELAY)
640 		mode |= FMODE_NDELAY;
641 	else
642 		mode &= ~FMODE_NDELAY;
643 
644 	switch (cmd) {
645 	/* These need separate implementations for the data structure */
646 	case HDIO_GETGEO:
647 		return compat_hdio_getgeo(bdev, argp);
648 	case BLKPG:
649 		return compat_blkpg_ioctl(bdev, argp);
650 
651 	/* Compat mode returns 32-bit data instead of 'long' */
652 	case BLKRAGET:
653 	case BLKFRAGET:
654 		if (!argp)
655 			return -EINVAL;
656 		return compat_put_long(argp,
657 			(bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512);
658 	case BLKGETSIZE:
659 		if (bdev_nr_sectors(bdev) > ~(compat_ulong_t)0)
660 			return -EFBIG;
661 		return compat_put_ulong(argp, bdev_nr_sectors(bdev));
662 
663 	/* The data is compatible, but the command number is different */
664 	case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
665 		return put_int(argp, bdev_logical_block_size(bdev));
666 	case BLKBSZSET_32:
667 		return blkdev_bszset(bdev, mode, argp);
668 	case BLKGETSIZE64_32:
669 		return put_u64(argp, bdev_nr_bytes(bdev));
670 
671 	/* Incompatible alignment on i386 */
672 	case BLKTRACESETUP32:
673 		return blk_trace_ioctl(bdev, cmd, argp);
674 	default:
675 		break;
676 	}
677 
678 	ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
679 	if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
680 		ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
681 
682 	return ret;
683 }
684 #endif
685