xref: /openbmc/linux/block/ioctl.c (revision c5c87812) 
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 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 	/* check for fit in a hd_struct */
39 	if (sizeof(sector_t) < sizeof(long long)) {
40 		long pstart = start, plength = length;
41 
42 		if (pstart != start || plength != length || pstart < 0 ||
43 		    plength < 0 || p.pno > 65535)
44 			return -EINVAL;
45 	}
46 
47 	switch (op) {
48 	case BLKPG_ADD_PARTITION:
49 		/* check if partition is aligned to blocksize */
50 		if (p.start & (bdev_logical_block_size(bdev) - 1))
51 			return -EINVAL;
52 		return bdev_add_partition(bdev, p.pno, start, length);
53 	case BLKPG_RESIZE_PARTITION:
54 		return bdev_resize_partition(bdev, p.pno, start, length);
55 	default:
56 		return -EINVAL;
57 	}
58 }
59 
60 static int blkpg_ioctl(struct block_device *bdev,
61 		       struct blkpg_ioctl_arg __user *arg)
62 {
63 	struct blkpg_partition __user *udata;
64 	int op;
65 
66 	if (get_user(op, &arg->op) || get_user(udata, &arg->data))
67 		return -EFAULT;
68 
69 	return blkpg_do_ioctl(bdev, udata, op);
70 }
71 
72 #ifdef CONFIG_COMPAT
73 struct compat_blkpg_ioctl_arg {
74 	compat_int_t op;
75 	compat_int_t flags;
76 	compat_int_t datalen;
77 	compat_caddr_t data;
78 };
79 
80 static int compat_blkpg_ioctl(struct block_device *bdev,
81 			      struct compat_blkpg_ioctl_arg __user *arg)
82 {
83 	compat_caddr_t udata;
84 	int op;
85 
86 	if (get_user(op, &arg->op) || get_user(udata, &arg->data))
87 		return -EFAULT;
88 
89 	return blkpg_do_ioctl(bdev, compat_ptr(udata), op);
90 }
91 #endif
92 
93 static int blkdev_reread_part(struct block_device *bdev)
94 {
95 	int ret;
96 
97 	if (!disk_part_scan_enabled(bdev->bd_disk) || bdev_is_partition(bdev))
98 		return -EINVAL;
99 	if (!capable(CAP_SYS_ADMIN))
100 		return -EACCES;
101 
102 	mutex_lock(&bdev->bd_mutex);
103 	ret = bdev_disk_changed(bdev, false);
104 	mutex_unlock(&bdev->bd_mutex);
105 
106 	return ret;
107 }
108 
109 static 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 
145 static 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 
180 static int put_ushort(unsigned short __user *argp, unsigned short val)
181 {
182 	return put_user(val, argp);
183 }
184 
185 static int put_int(int __user *argp, int val)
186 {
187 	return put_user(val, argp);
188 }
189 
190 static int put_uint(unsigned int __user *argp, unsigned int val)
191 {
192 	return put_user(val, argp);
193 }
194 
195 static int put_long(long __user *argp, long val)
196 {
197 	return put_user(val, argp);
198 }
199 
200 static int put_ulong(unsigned long __user *argp, unsigned long val)
201 {
202 	return put_user(val, argp);
203 }
204 
205 static int put_u64(u64 __user *argp, u64 val)
206 {
207 	return put_user(val, argp);
208 }
209 
210 #ifdef CONFIG_COMPAT
211 static int compat_put_long(compat_long_t __user *argp, long val)
212 {
213 	return put_user(val, argp);
214 }
215 
216 static 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 int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
223 			unsigned cmd, unsigned long arg)
224 {
225 	struct gendisk *disk = bdev->bd_disk;
226 
227 	if (disk->fops->ioctl)
228 		return disk->fops->ioctl(bdev, mode, cmd, arg);
229 
230 	return -ENOTTY;
231 }
232 /*
233  * For the record: _GPL here is only because somebody decided to slap it
234  * on the previous export.  Sheer idiocy, since it wasn't copyrightable
235  * at all and could be open-coded without any exports by anybody who cares.
236  */
237 EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl);
238 
239 #ifdef CONFIG_COMPAT
240 /*
241  * This is the equivalent of compat_ptr_ioctl(), to be used by block
242  * drivers that implement only commands that are completely compatible
243  * between 32-bit and 64-bit user space
244  */
245 int blkdev_compat_ptr_ioctl(struct block_device *bdev, fmode_t mode,
246 			unsigned cmd, unsigned long arg)
247 {
248 	struct gendisk *disk = bdev->bd_disk;
249 
250 	if (disk->fops->ioctl)
251 		return disk->fops->ioctl(bdev, mode, cmd,
252 					 (unsigned long)compat_ptr(arg));
253 
254 	return -ENOIOCTLCMD;
255 }
256 EXPORT_SYMBOL(blkdev_compat_ptr_ioctl);
257 #endif
258 
259 static int blkdev_pr_register(struct block_device *bdev,
260 		struct pr_registration __user *arg)
261 {
262 	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
263 	struct pr_registration reg;
264 
265 	if (!capable(CAP_SYS_ADMIN))
266 		return -EPERM;
267 	if (!ops || !ops->pr_register)
268 		return -EOPNOTSUPP;
269 	if (copy_from_user(&reg, arg, sizeof(reg)))
270 		return -EFAULT;
271 
272 	if (reg.flags & ~PR_FL_IGNORE_KEY)
273 		return -EOPNOTSUPP;
274 	return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags);
275 }
276 
277 static int blkdev_pr_reserve(struct block_device *bdev,
278 		struct pr_reservation __user *arg)
279 {
280 	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
281 	struct pr_reservation rsv;
282 
283 	if (!capable(CAP_SYS_ADMIN))
284 		return -EPERM;
285 	if (!ops || !ops->pr_reserve)
286 		return -EOPNOTSUPP;
287 	if (copy_from_user(&rsv, arg, sizeof(rsv)))
288 		return -EFAULT;
289 
290 	if (rsv.flags & ~PR_FL_IGNORE_KEY)
291 		return -EOPNOTSUPP;
292 	return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags);
293 }
294 
295 static int blkdev_pr_release(struct block_device *bdev,
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 (!capable(CAP_SYS_ADMIN))
302 		return -EPERM;
303 	if (!ops || !ops->pr_release)
304 		return -EOPNOTSUPP;
305 	if (copy_from_user(&rsv, arg, sizeof(rsv)))
306 		return -EFAULT;
307 
308 	if (rsv.flags)
309 		return -EOPNOTSUPP;
310 	return ops->pr_release(bdev, rsv.key, rsv.type);
311 }
312 
313 static int blkdev_pr_preempt(struct block_device *bdev,
314 		struct pr_preempt __user *arg, bool abort)
315 {
316 	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
317 	struct pr_preempt p;
318 
319 	if (!capable(CAP_SYS_ADMIN))
320 		return -EPERM;
321 	if (!ops || !ops->pr_preempt)
322 		return -EOPNOTSUPP;
323 	if (copy_from_user(&p, arg, sizeof(p)))
324 		return -EFAULT;
325 
326 	if (p.flags)
327 		return -EOPNOTSUPP;
328 	return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort);
329 }
330 
331 static int blkdev_pr_clear(struct block_device *bdev,
332 		struct pr_clear __user *arg)
333 {
334 	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
335 	struct pr_clear c;
336 
337 	if (!capable(CAP_SYS_ADMIN))
338 		return -EPERM;
339 	if (!ops || !ops->pr_clear)
340 		return -EOPNOTSUPP;
341 	if (copy_from_user(&c, arg, sizeof(c)))
342 		return -EFAULT;
343 
344 	if (c.flags)
345 		return -EOPNOTSUPP;
346 	return ops->pr_clear(bdev, c.key);
347 }
348 
349 /*
350  * Is it an unrecognized ioctl? The correct returns are either
351  * ENOTTY (final) or ENOIOCTLCMD ("I don't know this one, try a
352  * fallback"). ENOIOCTLCMD gets turned into ENOTTY by the ioctl
353  * code before returning.
354  *
355  * Confused drivers sometimes return EINVAL, which is wrong. It
356  * means "I understood the ioctl command, but the parameters to
357  * it were wrong".
358  *
359  * We should aim to just fix the broken drivers, the EINVAL case
360  * should go away.
361  */
362 static inline int is_unrecognized_ioctl(int ret)
363 {
364 	return	ret == -EINVAL ||
365 		ret == -ENOTTY ||
366 		ret == -ENOIOCTLCMD;
367 }
368 
369 static int blkdev_flushbuf(struct block_device *bdev, fmode_t mode,
370 		unsigned cmd, unsigned long arg)
371 {
372 	int ret;
373 
374 	if (!capable(CAP_SYS_ADMIN))
375 		return -EACCES;
376 
377 	ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
378 	if (!is_unrecognized_ioctl(ret))
379 		return ret;
380 
381 	fsync_bdev(bdev);
382 	invalidate_bdev(bdev);
383 	return 0;
384 }
385 
386 static int blkdev_roset(struct block_device *bdev, fmode_t mode,
387 		unsigned cmd, unsigned long arg)
388 {
389 	int ret, n;
390 
391 	if (!capable(CAP_SYS_ADMIN))
392 		return -EACCES;
393 
394 	ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
395 	if (!is_unrecognized_ioctl(ret))
396 		return ret;
397 	if (get_user(n, (int __user *)arg))
398 		return -EFAULT;
399 	set_device_ro(bdev, 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, fmode_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 & FMODE_EXCL)
482 		return set_blocksize(bdev, n);
483 
484 	if (IS_ERR(blkdev_get_by_dev(bdev->bd_dev, mode | FMODE_EXCL, &bdev)))
485 		return -EBUSY;
486 	ret = set_blocksize(bdev, n);
487 	blkdev_put(bdev, mode | FMODE_EXCL);
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, fmode_t mode,
498 				unsigned cmd, unsigned long arg, void __user *argp)
499 {
500 	unsigned int max_sectors;
501 
502 	switch (cmd) {
503 	case BLKFLSBUF:
504 		return blkdev_flushbuf(bdev, mode, cmd, arg);
505 	case BLKROSET:
506 		return blkdev_roset(bdev, mode, cmd, arg);
507 	case BLKDISCARD:
508 		return blk_ioctl_discard(bdev, mode, arg, 0);
509 	case BLKSECDISCARD:
510 		return blk_ioctl_discard(bdev, mode, arg,
511 				BLKDEV_DISCARD_SECURE);
512 	case BLKZEROOUT:
513 		return blk_ioctl_zeroout(bdev, mode, arg);
514 	case BLKREPORTZONE:
515 		return blkdev_report_zones_ioctl(bdev, mode, cmd, arg);
516 	case BLKRESETZONE:
517 	case BLKOPENZONE:
518 	case BLKCLOSEZONE:
519 	case BLKFINISHZONE:
520 		return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg);
521 	case BLKGETZONESZ:
522 		return put_uint(argp, bdev_zone_sectors(bdev));
523 	case BLKGETNRZONES:
524 		return put_uint(argp, blkdev_nr_zones(bdev->bd_disk));
525 	case BLKROGET:
526 		return put_int(argp, bdev_read_only(bdev) != 0);
527 	case BLKSSZGET: /* get block device logical block size */
528 		return put_int(argp, bdev_logical_block_size(bdev));
529 	case BLKPBSZGET: /* get block device physical block size */
530 		return put_uint(argp, bdev_physical_block_size(bdev));
531 	case BLKIOMIN:
532 		return put_uint(argp, bdev_io_min(bdev));
533 	case BLKIOOPT:
534 		return put_uint(argp, bdev_io_opt(bdev));
535 	case BLKALIGNOFF:
536 		return put_int(argp, bdev_alignment_offset(bdev));
537 	case BLKDISCARDZEROES:
538 		return put_uint(argp, 0);
539 	case BLKSECTGET:
540 		max_sectors = min_t(unsigned int, USHRT_MAX,
541 				    queue_max_sectors(bdev_get_queue(bdev)));
542 		return put_ushort(argp, max_sectors);
543 	case BLKROTATIONAL:
544 		return put_ushort(argp, !blk_queue_nonrot(bdev_get_queue(bdev)));
545 	case BLKRASET:
546 	case BLKFRASET:
547 		if(!capable(CAP_SYS_ADMIN))
548 			return -EACCES;
549 		bdev->bd_bdi->ra_pages = (arg * 512) / PAGE_SIZE;
550 		return 0;
551 	case BLKRRPART:
552 		return blkdev_reread_part(bdev);
553 	case BLKTRACESTART:
554 	case BLKTRACESTOP:
555 	case BLKTRACETEARDOWN:
556 		return blk_trace_ioctl(bdev, cmd, argp);
557 	case IOC_PR_REGISTER:
558 		return blkdev_pr_register(bdev, argp);
559 	case IOC_PR_RESERVE:
560 		return blkdev_pr_reserve(bdev, argp);
561 	case IOC_PR_RELEASE:
562 		return blkdev_pr_release(bdev, argp);
563 	case IOC_PR_PREEMPT:
564 		return blkdev_pr_preempt(bdev, argp, false);
565 	case IOC_PR_PREEMPT_ABORT:
566 		return blkdev_pr_preempt(bdev, argp, true);
567 	case IOC_PR_CLEAR:
568 		return blkdev_pr_clear(bdev, argp);
569 	default:
570 		return -ENOIOCTLCMD;
571 	}
572 }
573 
574 /*
575  * Always keep this in sync with compat_blkdev_ioctl()
576  * to handle all incompatible commands in both functions.
577  *
578  * New commands must be compatible and go into blkdev_common_ioctl
579  */
580 int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
581 			unsigned long arg)
582 {
583 	int ret;
584 	loff_t size;
585 	void __user *argp = (void __user *)arg;
586 
587 	switch (cmd) {
588 	/* These need separate implementations for the data structure */
589 	case HDIO_GETGEO:
590 		return blkdev_getgeo(bdev, argp);
591 	case BLKPG:
592 		return blkpg_ioctl(bdev, argp);
593 
594 	/* Compat mode returns 32-bit data instead of 'long' */
595 	case BLKRAGET:
596 	case BLKFRAGET:
597 		if (!argp)
598 			return -EINVAL;
599 		return put_long(argp, (bdev->bd_bdi->ra_pages*PAGE_SIZE) / 512);
600 	case BLKGETSIZE:
601 		size = i_size_read(bdev->bd_inode);
602 		if ((size >> 9) > ~0UL)
603 			return -EFBIG;
604 		return put_ulong(argp, size >> 9);
605 
606 	/* The data is compatible, but the command number is different */
607 	case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
608 		return put_int(argp, block_size(bdev));
609 	case BLKBSZSET:
610 		return blkdev_bszset(bdev, mode, argp);
611 	case BLKGETSIZE64:
612 		return put_u64(argp, i_size_read(bdev->bd_inode));
613 
614 	/* Incompatible alignment on i386 */
615 	case BLKTRACESETUP:
616 		return blk_trace_ioctl(bdev, cmd, argp);
617 	default:
618 		break;
619 	}
620 
621 	ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
622 	if (ret == -ENOIOCTLCMD)
623 		return __blkdev_driver_ioctl(bdev, mode, cmd, arg);
624 
625 	return ret;
626 }
627 EXPORT_SYMBOL_GPL(blkdev_ioctl); /* for /dev/raw */
628 
629 #ifdef CONFIG_COMPAT
630 
631 #define BLKBSZGET_32		_IOR(0x12, 112, int)
632 #define BLKBSZSET_32		_IOW(0x12, 113, int)
633 #define BLKGETSIZE64_32		_IOR(0x12, 114, int)
634 
635 /* Most of the generic ioctls are handled in the normal fallback path.
636    This assumes the blkdev's low level compat_ioctl always returns
637    ENOIOCTLCMD for unknown ioctls. */
638 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
639 {
640 	int ret;
641 	void __user *argp = compat_ptr(arg);
642 	struct inode *inode = file->f_mapping->host;
643 	struct block_device *bdev = inode->i_bdev;
644 	struct gendisk *disk = bdev->bd_disk;
645 	fmode_t mode = file->f_mode;
646 	loff_t size;
647 
648 	/*
649 	 * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
650 	 * to updated it before every ioctl.
651 	 */
652 	if (file->f_flags & O_NDELAY)
653 		mode |= FMODE_NDELAY;
654 	else
655 		mode &= ~FMODE_NDELAY;
656 
657 	switch (cmd) {
658 	/* These need separate implementations for the data structure */
659 	case HDIO_GETGEO:
660 		return compat_hdio_getgeo(bdev, argp);
661 	case BLKPG:
662 		return compat_blkpg_ioctl(bdev, argp);
663 
664 	/* Compat mode returns 32-bit data instead of 'long' */
665 	case BLKRAGET:
666 	case BLKFRAGET:
667 		if (!argp)
668 			return -EINVAL;
669 		return compat_put_long(argp,
670 			       (bdev->bd_bdi->ra_pages * PAGE_SIZE) / 512);
671 	case BLKGETSIZE:
672 		size = i_size_read(bdev->bd_inode);
673 		if ((size >> 9) > ~0UL)
674 			return -EFBIG;
675 		return compat_put_ulong(argp, size >> 9);
676 
677 	/* The data is compatible, but the command number is different */
678 	case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
679 		return put_int(argp, bdev_logical_block_size(bdev));
680 	case BLKBSZSET_32:
681 		return blkdev_bszset(bdev, mode, argp);
682 	case BLKGETSIZE64_32:
683 		return put_u64(argp, i_size_read(bdev->bd_inode));
684 
685 	/* Incompatible alignment on i386 */
686 	case BLKTRACESETUP32:
687 		return blk_trace_ioctl(bdev, cmd, argp);
688 	default:
689 		break;
690 	}
691 
692 	ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
693 	if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
694 		ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
695 
696 	return ret;
697 }
698 #endif
699