xref: /openbmc/linux/block/ioctl.c (revision cd99b9eb) 
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, blk_mode_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 & BLK_OPEN_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, blk_mode_t mode,
124 		void __user *argp)
125 {
126 	uint64_t start, len;
127 	uint64_t range[2];
128 	int err;
129 
130 	if (!(mode & BLK_OPEN_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, blk_mode_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 & BLK_OPEN_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, blk_mode_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 bool blkdev_pr_allowed(struct block_device *bdev, blk_mode_t mode)
258 {
259 	/* no sense to make reservations for partitions */
260 	if (bdev_is_partition(bdev))
261 		return false;
262 
263 	if (capable(CAP_SYS_ADMIN))
264 		return true;
265 	/*
266 	 * Only allow unprivileged reservations if the file descriptor is open
267 	 * for writing.
268 	 */
269 	return mode & BLK_OPEN_WRITE;
270 }
271 
272 static int blkdev_pr_register(struct block_device *bdev, blk_mode_t mode,
273 		struct pr_registration __user *arg)
274 {
275 	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
276 	struct pr_registration reg;
277 
278 	if (!blkdev_pr_allowed(bdev, mode))
279 		return -EPERM;
280 	if (!ops || !ops->pr_register)
281 		return -EOPNOTSUPP;
282 	if (copy_from_user(&reg, arg, sizeof(reg)))
283 		return -EFAULT;
284 
285 	if (reg.flags & ~PR_FL_IGNORE_KEY)
286 		return -EOPNOTSUPP;
287 	return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags);
288 }
289 
290 static int blkdev_pr_reserve(struct block_device *bdev, blk_mode_t mode,
291 		struct pr_reservation __user *arg)
292 {
293 	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
294 	struct pr_reservation rsv;
295 
296 	if (!blkdev_pr_allowed(bdev, mode))
297 		return -EPERM;
298 	if (!ops || !ops->pr_reserve)
299 		return -EOPNOTSUPP;
300 	if (copy_from_user(&rsv, arg, sizeof(rsv)))
301 		return -EFAULT;
302 
303 	if (rsv.flags & ~PR_FL_IGNORE_KEY)
304 		return -EOPNOTSUPP;
305 	return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags);
306 }
307 
308 static int blkdev_pr_release(struct block_device *bdev, blk_mode_t mode,
309 		struct pr_reservation __user *arg)
310 {
311 	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
312 	struct pr_reservation rsv;
313 
314 	if (!blkdev_pr_allowed(bdev, mode))
315 		return -EPERM;
316 	if (!ops || !ops->pr_release)
317 		return -EOPNOTSUPP;
318 	if (copy_from_user(&rsv, arg, sizeof(rsv)))
319 		return -EFAULT;
320 
321 	if (rsv.flags)
322 		return -EOPNOTSUPP;
323 	return ops->pr_release(bdev, rsv.key, rsv.type);
324 }
325 
326 static int blkdev_pr_preempt(struct block_device *bdev, blk_mode_t mode,
327 		struct pr_preempt __user *arg, bool abort)
328 {
329 	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
330 	struct pr_preempt p;
331 
332 	if (!blkdev_pr_allowed(bdev, mode))
333 		return -EPERM;
334 	if (!ops || !ops->pr_preempt)
335 		return -EOPNOTSUPP;
336 	if (copy_from_user(&p, arg, sizeof(p)))
337 		return -EFAULT;
338 
339 	if (p.flags)
340 		return -EOPNOTSUPP;
341 	return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort);
342 }
343 
344 static int blkdev_pr_clear(struct block_device *bdev, blk_mode_t mode,
345 		struct pr_clear __user *arg)
346 {
347 	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
348 	struct pr_clear c;
349 
350 	if (!blkdev_pr_allowed(bdev, mode))
351 		return -EPERM;
352 	if (!ops || !ops->pr_clear)
353 		return -EOPNOTSUPP;
354 	if (copy_from_user(&c, arg, sizeof(c)))
355 		return -EFAULT;
356 
357 	if (c.flags)
358 		return -EOPNOTSUPP;
359 	return ops->pr_clear(bdev, c.key);
360 }
361 
362 static int blkdev_flushbuf(struct block_device *bdev, unsigned cmd,
363 		unsigned long arg)
364 {
365 	if (!capable(CAP_SYS_ADMIN))
366 		return -EACCES;
367 
368 	mutex_lock(&bdev->bd_holder_lock);
369 	if (bdev->bd_holder_ops && bdev->bd_holder_ops->sync)
370 		bdev->bd_holder_ops->sync(bdev);
371 	else
372 		sync_blockdev(bdev);
373 	mutex_unlock(&bdev->bd_holder_lock);
374 
375 	invalidate_bdev(bdev);
376 	return 0;
377 }
378 
379 static int blkdev_roset(struct block_device *bdev, unsigned cmd,
380 		unsigned long arg)
381 {
382 	int ret, n;
383 
384 	if (!capable(CAP_SYS_ADMIN))
385 		return -EACCES;
386 
387 	if (get_user(n, (int __user *)arg))
388 		return -EFAULT;
389 	if (bdev->bd_disk->fops->set_read_only) {
390 		ret = bdev->bd_disk->fops->set_read_only(bdev, n);
391 		if (ret)
392 			return ret;
393 	}
394 	bdev->bd_read_only = n;
395 	return 0;
396 }
397 
398 static int blkdev_getgeo(struct block_device *bdev,
399 		struct hd_geometry __user *argp)
400 {
401 	struct gendisk *disk = bdev->bd_disk;
402 	struct hd_geometry geo;
403 	int ret;
404 
405 	if (!argp)
406 		return -EINVAL;
407 	if (!disk->fops->getgeo)
408 		return -ENOTTY;
409 
410 	/*
411 	 * We need to set the startsect first, the driver may
412 	 * want to override it.
413 	 */
414 	memset(&geo, 0, sizeof(geo));
415 	geo.start = get_start_sect(bdev);
416 	ret = disk->fops->getgeo(bdev, &geo);
417 	if (ret)
418 		return ret;
419 	if (copy_to_user(argp, &geo, sizeof(geo)))
420 		return -EFAULT;
421 	return 0;
422 }
423 
424 #ifdef CONFIG_COMPAT
425 struct compat_hd_geometry {
426 	unsigned char heads;
427 	unsigned char sectors;
428 	unsigned short cylinders;
429 	u32 start;
430 };
431 
432 static int compat_hdio_getgeo(struct block_device *bdev,
433 			      struct compat_hd_geometry __user *ugeo)
434 {
435 	struct gendisk *disk = bdev->bd_disk;
436 	struct hd_geometry geo;
437 	int ret;
438 
439 	if (!ugeo)
440 		return -EINVAL;
441 	if (!disk->fops->getgeo)
442 		return -ENOTTY;
443 
444 	memset(&geo, 0, sizeof(geo));
445 	/*
446 	 * We need to set the startsect first, the driver may
447 	 * want to override it.
448 	 */
449 	geo.start = get_start_sect(bdev);
450 	ret = disk->fops->getgeo(bdev, &geo);
451 	if (ret)
452 		return ret;
453 
454 	ret = copy_to_user(ugeo, &geo, 4);
455 	ret |= put_user(geo.start, &ugeo->start);
456 	if (ret)
457 		ret = -EFAULT;
458 
459 	return ret;
460 }
461 #endif
462 
463 /* set the logical block size */
464 static int blkdev_bszset(struct block_device *bdev, blk_mode_t mode,
465 		int __user *argp)
466 {
467 	int ret, n;
468 
469 	if (!capable(CAP_SYS_ADMIN))
470 		return -EACCES;
471 	if (!argp)
472 		return -EINVAL;
473 	if (get_user(n, argp))
474 		return -EFAULT;
475 
476 	if (mode & BLK_OPEN_EXCL)
477 		return set_blocksize(bdev, n);
478 
479 	if (IS_ERR(blkdev_get_by_dev(bdev->bd_dev, mode, &bdev, NULL)))
480 		return -EBUSY;
481 	ret = set_blocksize(bdev, n);
482 	blkdev_put(bdev, &bdev);
483 
484 	return ret;
485 }
486 
487 /*
488  * Common commands that are handled the same way on native and compat
489  * user space. Note the separate arg/argp parameters that are needed
490  * to deal with the compat_ptr() conversion.
491  */
492 static int blkdev_common_ioctl(struct block_device *bdev, blk_mode_t mode,
493 			       unsigned int cmd, unsigned long arg,
494 			       void __user *argp)
495 {
496 	unsigned int max_sectors;
497 
498 	switch (cmd) {
499 	case BLKFLSBUF:
500 		return blkdev_flushbuf(bdev, cmd, arg);
501 	case BLKROSET:
502 		return blkdev_roset(bdev, cmd, arg);
503 	case BLKDISCARD:
504 		return blk_ioctl_discard(bdev, mode, arg);
505 	case BLKSECDISCARD:
506 		return blk_ioctl_secure_erase(bdev, mode, argp);
507 	case BLKZEROOUT:
508 		return blk_ioctl_zeroout(bdev, mode, arg);
509 	case BLKGETDISKSEQ:
510 		return put_u64(argp, bdev->bd_disk->diskseq);
511 	case BLKREPORTZONE:
512 		return blkdev_report_zones_ioctl(bdev, cmd, arg);
513 	case BLKRESETZONE:
514 	case BLKOPENZONE:
515 	case BLKCLOSEZONE:
516 	case BLKFINISHZONE:
517 		return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg);
518 	case BLKGETZONESZ:
519 		return put_uint(argp, bdev_zone_sectors(bdev));
520 	case BLKGETNRZONES:
521 		return put_uint(argp, bdev_nr_zones(bdev));
522 	case BLKROGET:
523 		return put_int(argp, bdev_read_only(bdev) != 0);
524 	case BLKSSZGET: /* get block device logical block size */
525 		return put_int(argp, bdev_logical_block_size(bdev));
526 	case BLKPBSZGET: /* get block device physical block size */
527 		return put_uint(argp, bdev_physical_block_size(bdev));
528 	case BLKIOMIN:
529 		return put_uint(argp, bdev_io_min(bdev));
530 	case BLKIOOPT:
531 		return put_uint(argp, bdev_io_opt(bdev));
532 	case BLKALIGNOFF:
533 		return put_int(argp, bdev_alignment_offset(bdev));
534 	case BLKDISCARDZEROES:
535 		return put_uint(argp, 0);
536 	case BLKSECTGET:
537 		max_sectors = min_t(unsigned int, USHRT_MAX,
538 				    queue_max_sectors(bdev_get_queue(bdev)));
539 		return put_ushort(argp, max_sectors);
540 	case BLKROTATIONAL:
541 		return put_ushort(argp, !bdev_nonrot(bdev));
542 	case BLKRASET:
543 	case BLKFRASET:
544 		if(!capable(CAP_SYS_ADMIN))
545 			return -EACCES;
546 		bdev->bd_disk->bdi->ra_pages = (arg * 512) / PAGE_SIZE;
547 		return 0;
548 	case BLKRRPART:
549 		if (!capable(CAP_SYS_ADMIN))
550 			return -EACCES;
551 		if (bdev_is_partition(bdev))
552 			return -EINVAL;
553 		return disk_scan_partitions(bdev->bd_disk, mode);
554 	case BLKTRACESTART:
555 	case BLKTRACESTOP:
556 	case BLKTRACETEARDOWN:
557 		return blk_trace_ioctl(bdev, cmd, argp);
558 	case IOC_PR_REGISTER:
559 		return blkdev_pr_register(bdev, mode, argp);
560 	case IOC_PR_RESERVE:
561 		return blkdev_pr_reserve(bdev, mode, argp);
562 	case IOC_PR_RELEASE:
563 		return blkdev_pr_release(bdev, mode, argp);
564 	case IOC_PR_PREEMPT:
565 		return blkdev_pr_preempt(bdev, mode, argp, false);
566 	case IOC_PR_PREEMPT_ABORT:
567 		return blkdev_pr_preempt(bdev, mode, argp, true);
568 	case IOC_PR_CLEAR:
569 		return blkdev_pr_clear(bdev, mode, argp);
570 	default:
571 		return -ENOIOCTLCMD;
572 	}
573 }
574 
575 /*
576  * Always keep this in sync with compat_blkdev_ioctl()
577  * to handle all incompatible commands in both functions.
578  *
579  * New commands must be compatible and go into blkdev_common_ioctl
580  */
581 long blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
582 {
583 	struct block_device *bdev = I_BDEV(file->f_mapping->host);
584 	void __user *argp = (void __user *)arg;
585 	blk_mode_t mode = file_to_blk_mode(file);
586 	int ret;
587 
588 	switch (cmd) {
589 	/* These need separate implementations for the data structure */
590 	case HDIO_GETGEO:
591 		return blkdev_getgeo(bdev, argp);
592 	case BLKPG:
593 		return blkpg_ioctl(bdev, argp);
594 
595 	/* Compat mode returns 32-bit data instead of 'long' */
596 	case BLKRAGET:
597 	case BLKFRAGET:
598 		if (!argp)
599 			return -EINVAL;
600 		return put_long(argp,
601 			(bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512);
602 	case BLKGETSIZE:
603 		if (bdev_nr_sectors(bdev) > ~0UL)
604 			return -EFBIG;
605 		return put_ulong(argp, bdev_nr_sectors(bdev));
606 
607 	/* The data is compatible, but the command number is different */
608 	case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
609 		return put_int(argp, block_size(bdev));
610 	case BLKBSZSET:
611 		return blkdev_bszset(bdev, mode, argp);
612 	case BLKGETSIZE64:
613 		return put_u64(argp, bdev_nr_bytes(bdev));
614 
615 	/* Incompatible alignment on i386 */
616 	case BLKTRACESETUP:
617 		return blk_trace_ioctl(bdev, cmd, argp);
618 	default:
619 		break;
620 	}
621 
622 	ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
623 	if (ret != -ENOIOCTLCMD)
624 		return ret;
625 
626 	if (!bdev->bd_disk->fops->ioctl)
627 		return -ENOTTY;
628 	return bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg);
629 }
630 
631 #ifdef CONFIG_COMPAT
632 
633 #define BLKBSZGET_32		_IOR(0x12, 112, int)
634 #define BLKBSZSET_32		_IOW(0x12, 113, int)
635 #define BLKGETSIZE64_32		_IOR(0x12, 114, int)
636 
637 /* Most of the generic ioctls are handled in the normal fallback path.
638    This assumes the blkdev's low level compat_ioctl always returns
639    ENOIOCTLCMD for unknown ioctls. */
640 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
641 {
642 	int ret;
643 	void __user *argp = compat_ptr(arg);
644 	struct block_device *bdev = I_BDEV(file->f_mapping->host);
645 	struct gendisk *disk = bdev->bd_disk;
646 	blk_mode_t mode = file_to_blk_mode(file);
647 
648 	switch (cmd) {
649 	/* These need separate implementations for the data structure */
650 	case HDIO_GETGEO:
651 		return compat_hdio_getgeo(bdev, argp);
652 	case BLKPG:
653 		return compat_blkpg_ioctl(bdev, argp);
654 
655 	/* Compat mode returns 32-bit data instead of 'long' */
656 	case BLKRAGET:
657 	case BLKFRAGET:
658 		if (!argp)
659 			return -EINVAL;
660 		return compat_put_long(argp,
661 			(bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512);
662 	case BLKGETSIZE:
663 		if (bdev_nr_sectors(bdev) > ~(compat_ulong_t)0)
664 			return -EFBIG;
665 		return compat_put_ulong(argp, bdev_nr_sectors(bdev));
666 
667 	/* The data is compatible, but the command number is different */
668 	case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
669 		return put_int(argp, bdev_logical_block_size(bdev));
670 	case BLKBSZSET_32:
671 		return blkdev_bszset(bdev, mode, argp);
672 	case BLKGETSIZE64_32:
673 		return put_u64(argp, bdev_nr_bytes(bdev));
674 
675 	/* Incompatible alignment on i386 */
676 	case BLKTRACESETUP32:
677 		return blk_trace_ioctl(bdev, cmd, argp);
678 	default:
679 		break;
680 	}
681 
682 	ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
683 	if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
684 		ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
685 
686 	return ret;
687 }
688 #endif
689