xref: /openbmc/linux/block/ioctl.c (revision b285d2ae) 
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 != bdev->bd_contains)
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 != bdev->bd_contains)
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 	struct address_space *mapping = bdev->bd_inode->i_mapping;
116 
117 
118 	if (!(mode & FMODE_WRITE))
119 		return -EBADF;
120 
121 	if (!blk_queue_discard(q))
122 		return -EOPNOTSUPP;
123 
124 	if (copy_from_user(range, (void __user *)arg, sizeof(range)))
125 		return -EFAULT;
126 
127 	start = range[0];
128 	len = range[1];
129 
130 	if (start & 511)
131 		return -EINVAL;
132 	if (len & 511)
133 		return -EINVAL;
134 
135 	if (start + len > i_size_read(bdev->bd_inode))
136 		return -EINVAL;
137 	truncate_inode_pages_range(mapping, start, start + len - 1);
138 	return blkdev_issue_discard(bdev, start >> 9, len >> 9,
139 				    GFP_KERNEL, flags);
140 }
141 
142 static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode,
143 		unsigned long arg)
144 {
145 	uint64_t range[2];
146 	struct address_space *mapping;
147 	uint64_t start, end, len;
148 
149 	if (!(mode & FMODE_WRITE))
150 		return -EBADF;
151 
152 	if (copy_from_user(range, (void __user *)arg, sizeof(range)))
153 		return -EFAULT;
154 
155 	start = range[0];
156 	len = range[1];
157 	end = start + len - 1;
158 
159 	if (start & 511)
160 		return -EINVAL;
161 	if (len & 511)
162 		return -EINVAL;
163 	if (end >= (uint64_t)i_size_read(bdev->bd_inode))
164 		return -EINVAL;
165 	if (end < start)
166 		return -EINVAL;
167 
168 	/* Invalidate the page cache, including dirty pages */
169 	mapping = bdev->bd_inode->i_mapping;
170 	truncate_inode_pages_range(mapping, start, end);
171 
172 	return blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL,
173 			BLKDEV_ZERO_NOUNMAP);
174 }
175 
176 static int put_ushort(unsigned short __user *argp, unsigned short val)
177 {
178 	return put_user(val, argp);
179 }
180 
181 static int put_int(int __user *argp, int val)
182 {
183 	return put_user(val, argp);
184 }
185 
186 static int put_uint(unsigned int __user *argp, unsigned int val)
187 {
188 	return put_user(val, argp);
189 }
190 
191 static int put_long(long __user *argp, long val)
192 {
193 	return put_user(val, argp);
194 }
195 
196 static int put_ulong(unsigned long __user *argp, unsigned long val)
197 {
198 	return put_user(val, argp);
199 }
200 
201 static int put_u64(u64 __user *argp, u64 val)
202 {
203 	return put_user(val, argp);
204 }
205 
206 #ifdef CONFIG_COMPAT
207 static int compat_put_long(compat_long_t __user *argp, long val)
208 {
209 	return put_user(val, argp);
210 }
211 
212 static int compat_put_ulong(compat_ulong_t __user *argp, compat_ulong_t val)
213 {
214 	return put_user(val, argp);
215 }
216 #endif
217 
218 int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
219 			unsigned cmd, unsigned long arg)
220 {
221 	struct gendisk *disk = bdev->bd_disk;
222 
223 	if (disk->fops->ioctl)
224 		return disk->fops->ioctl(bdev, mode, cmd, arg);
225 
226 	return -ENOTTY;
227 }
228 /*
229  * For the record: _GPL here is only because somebody decided to slap it
230  * on the previous export.  Sheer idiocy, since it wasn't copyrightable
231  * at all and could be open-coded without any exports by anybody who cares.
232  */
233 EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl);
234 
235 #ifdef CONFIG_COMPAT
236 /*
237  * This is the equivalent of compat_ptr_ioctl(), to be used by block
238  * drivers that implement only commands that are completely compatible
239  * between 32-bit and 64-bit user space
240  */
241 int blkdev_compat_ptr_ioctl(struct block_device *bdev, fmode_t mode,
242 			unsigned cmd, unsigned long arg)
243 {
244 	struct gendisk *disk = bdev->bd_disk;
245 
246 	if (disk->fops->ioctl)
247 		return disk->fops->ioctl(bdev, mode, cmd,
248 					 (unsigned long)compat_ptr(arg));
249 
250 	return -ENOIOCTLCMD;
251 }
252 EXPORT_SYMBOL(blkdev_compat_ptr_ioctl);
253 #endif
254 
255 static int blkdev_pr_register(struct block_device *bdev,
256 		struct pr_registration __user *arg)
257 {
258 	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
259 	struct pr_registration reg;
260 
261 	if (!capable(CAP_SYS_ADMIN))
262 		return -EPERM;
263 	if (!ops || !ops->pr_register)
264 		return -EOPNOTSUPP;
265 	if (copy_from_user(&reg, arg, sizeof(reg)))
266 		return -EFAULT;
267 
268 	if (reg.flags & ~PR_FL_IGNORE_KEY)
269 		return -EOPNOTSUPP;
270 	return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags);
271 }
272 
273 static int blkdev_pr_reserve(struct block_device *bdev,
274 		struct pr_reservation __user *arg)
275 {
276 	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
277 	struct pr_reservation rsv;
278 
279 	if (!capable(CAP_SYS_ADMIN))
280 		return -EPERM;
281 	if (!ops || !ops->pr_reserve)
282 		return -EOPNOTSUPP;
283 	if (copy_from_user(&rsv, arg, sizeof(rsv)))
284 		return -EFAULT;
285 
286 	if (rsv.flags & ~PR_FL_IGNORE_KEY)
287 		return -EOPNOTSUPP;
288 	return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags);
289 }
290 
291 static int blkdev_pr_release(struct block_device *bdev,
292 		struct pr_reservation __user *arg)
293 {
294 	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
295 	struct pr_reservation rsv;
296 
297 	if (!capable(CAP_SYS_ADMIN))
298 		return -EPERM;
299 	if (!ops || !ops->pr_release)
300 		return -EOPNOTSUPP;
301 	if (copy_from_user(&rsv, arg, sizeof(rsv)))
302 		return -EFAULT;
303 
304 	if (rsv.flags)
305 		return -EOPNOTSUPP;
306 	return ops->pr_release(bdev, rsv.key, rsv.type);
307 }
308 
309 static int blkdev_pr_preempt(struct block_device *bdev,
310 		struct pr_preempt __user *arg, bool abort)
311 {
312 	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
313 	struct pr_preempt p;
314 
315 	if (!capable(CAP_SYS_ADMIN))
316 		return -EPERM;
317 	if (!ops || !ops->pr_preempt)
318 		return -EOPNOTSUPP;
319 	if (copy_from_user(&p, arg, sizeof(p)))
320 		return -EFAULT;
321 
322 	if (p.flags)
323 		return -EOPNOTSUPP;
324 	return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort);
325 }
326 
327 static int blkdev_pr_clear(struct block_device *bdev,
328 		struct pr_clear __user *arg)
329 {
330 	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
331 	struct pr_clear c;
332 
333 	if (!capable(CAP_SYS_ADMIN))
334 		return -EPERM;
335 	if (!ops || !ops->pr_clear)
336 		return -EOPNOTSUPP;
337 	if (copy_from_user(&c, arg, sizeof(c)))
338 		return -EFAULT;
339 
340 	if (c.flags)
341 		return -EOPNOTSUPP;
342 	return ops->pr_clear(bdev, c.key);
343 }
344 
345 /*
346  * Is it an unrecognized ioctl? The correct returns are either
347  * ENOTTY (final) or ENOIOCTLCMD ("I don't know this one, try a
348  * fallback"). ENOIOCTLCMD gets turned into ENOTTY by the ioctl
349  * code before returning.
350  *
351  * Confused drivers sometimes return EINVAL, which is wrong. It
352  * means "I understood the ioctl command, but the parameters to
353  * it were wrong".
354  *
355  * We should aim to just fix the broken drivers, the EINVAL case
356  * should go away.
357  */
358 static inline int is_unrecognized_ioctl(int ret)
359 {
360 	return	ret == -EINVAL ||
361 		ret == -ENOTTY ||
362 		ret == -ENOIOCTLCMD;
363 }
364 
365 static int blkdev_flushbuf(struct block_device *bdev, fmode_t mode,
366 		unsigned cmd, unsigned long arg)
367 {
368 	int ret;
369 
370 	if (!capable(CAP_SYS_ADMIN))
371 		return -EACCES;
372 
373 	ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
374 	if (!is_unrecognized_ioctl(ret))
375 		return ret;
376 
377 	fsync_bdev(bdev);
378 	invalidate_bdev(bdev);
379 	return 0;
380 }
381 
382 static int blkdev_roset(struct block_device *bdev, fmode_t mode,
383 		unsigned cmd, unsigned long arg)
384 {
385 	int ret, n;
386 
387 	if (!capable(CAP_SYS_ADMIN))
388 		return -EACCES;
389 
390 	ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
391 	if (!is_unrecognized_ioctl(ret))
392 		return ret;
393 	if (get_user(n, (int __user *)arg))
394 		return -EFAULT;
395 	set_device_ro(bdev, n);
396 	return 0;
397 }
398 
399 static int blkdev_getgeo(struct block_device *bdev,
400 		struct hd_geometry __user *argp)
401 {
402 	struct gendisk *disk = bdev->bd_disk;
403 	struct hd_geometry geo;
404 	int ret;
405 
406 	if (!argp)
407 		return -EINVAL;
408 	if (!disk->fops->getgeo)
409 		return -ENOTTY;
410 
411 	/*
412 	 * We need to set the startsect first, the driver may
413 	 * want to override it.
414 	 */
415 	memset(&geo, 0, sizeof(geo));
416 	geo.start = get_start_sect(bdev);
417 	ret = disk->fops->getgeo(bdev, &geo);
418 	if (ret)
419 		return ret;
420 	if (copy_to_user(argp, &geo, sizeof(geo)))
421 		return -EFAULT;
422 	return 0;
423 }
424 
425 #ifdef CONFIG_COMPAT
426 struct compat_hd_geometry {
427 	unsigned char heads;
428 	unsigned char sectors;
429 	unsigned short cylinders;
430 	u32 start;
431 };
432 
433 static int compat_hdio_getgeo(struct block_device *bdev,
434 			      struct compat_hd_geometry __user *ugeo)
435 {
436 	struct gendisk *disk = bdev->bd_disk;
437 	struct hd_geometry geo;
438 	int ret;
439 
440 	if (!ugeo)
441 		return -EINVAL;
442 	if (!disk->fops->getgeo)
443 		return -ENOTTY;
444 
445 	memset(&geo, 0, sizeof(geo));
446 	/*
447 	 * We need to set the startsect first, the driver may
448 	 * want to override it.
449 	 */
450 	geo.start = get_start_sect(bdev);
451 	ret = disk->fops->getgeo(bdev, &geo);
452 	if (ret)
453 		return ret;
454 
455 	ret = copy_to_user(ugeo, &geo, 4);
456 	ret |= put_user(geo.start, &ugeo->start);
457 	if (ret)
458 		ret = -EFAULT;
459 
460 	return ret;
461 }
462 #endif
463 
464 /* set the logical block size */
465 static int blkdev_bszset(struct block_device *bdev, fmode_t mode,
466 		int __user *argp)
467 {
468 	int ret, n;
469 
470 	if (!capable(CAP_SYS_ADMIN))
471 		return -EACCES;
472 	if (!argp)
473 		return -EINVAL;
474 	if (get_user(n, argp))
475 		return -EFAULT;
476 
477 	if (!(mode & FMODE_EXCL)) {
478 		bdgrab(bdev);
479 		if (blkdev_get(bdev, mode | FMODE_EXCL, &bdev) < 0)
480 			return -EBUSY;
481 	}
482 
483 	ret = set_blocksize(bdev, n);
484 	if (!(mode & FMODE_EXCL))
485 		blkdev_put(bdev, mode | FMODE_EXCL);
486 	return ret;
487 }
488 
489 /*
490  * Common commands that are handled the same way on native and compat
491  * user space. Note the separate arg/argp parameters that are needed
492  * to deal with the compat_ptr() conversion.
493  */
494 static int blkdev_common_ioctl(struct block_device *bdev, fmode_t mode,
495 				unsigned cmd, unsigned long arg, void __user *argp)
496 {
497 	unsigned int max_sectors;
498 
499 	switch (cmd) {
500 	case BLKFLSBUF:
501 		return blkdev_flushbuf(bdev, mode, cmd, arg);
502 	case BLKROSET:
503 		return blkdev_roset(bdev, mode, cmd, arg);
504 	case BLKDISCARD:
505 		return blk_ioctl_discard(bdev, mode, arg, 0);
506 	case BLKSECDISCARD:
507 		return blk_ioctl_discard(bdev, mode, arg,
508 				BLKDEV_DISCARD_SECURE);
509 	case BLKZEROOUT:
510 		return blk_ioctl_zeroout(bdev, mode, arg);
511 	case BLKREPORTZONE:
512 		return blkdev_report_zones_ioctl(bdev, mode, 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, blkdev_nr_zones(bdev->bd_disk));
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, !blk_queue_nonrot(bdev_get_queue(bdev)));
542 	case BLKRASET:
543 	case BLKFRASET:
544 		if(!capable(CAP_SYS_ADMIN))
545 			return -EACCES;
546 		bdev->bd_bdi->ra_pages = (arg * 512) / PAGE_SIZE;
547 		return 0;
548 	case BLKRRPART:
549 		return blkdev_reread_part(bdev);
550 	case BLKTRACESTART:
551 	case BLKTRACESTOP:
552 	case BLKTRACETEARDOWN:
553 		return blk_trace_ioctl(bdev, cmd, argp);
554 	case IOC_PR_REGISTER:
555 		return blkdev_pr_register(bdev, argp);
556 	case IOC_PR_RESERVE:
557 		return blkdev_pr_reserve(bdev, argp);
558 	case IOC_PR_RELEASE:
559 		return blkdev_pr_release(bdev, argp);
560 	case IOC_PR_PREEMPT:
561 		return blkdev_pr_preempt(bdev, argp, false);
562 	case IOC_PR_PREEMPT_ABORT:
563 		return blkdev_pr_preempt(bdev, argp, true);
564 	case IOC_PR_CLEAR:
565 		return blkdev_pr_clear(bdev, argp);
566 	default:
567 		return -ENOIOCTLCMD;
568 	}
569 }
570 
571 /*
572  * Always keep this in sync with compat_blkdev_ioctl()
573  * to handle all incompatible commands in both functions.
574  *
575  * New commands must be compatible and go into blkdev_common_ioctl
576  */
577 int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
578 			unsigned long arg)
579 {
580 	int ret;
581 	loff_t size;
582 	void __user *argp = (void __user *)arg;
583 
584 	switch (cmd) {
585 	/* These need separate implementations for the data structure */
586 	case HDIO_GETGEO:
587 		return blkdev_getgeo(bdev, argp);
588 	case BLKPG:
589 		return blkpg_ioctl(bdev, argp);
590 
591 	/* Compat mode returns 32-bit data instead of 'long' */
592 	case BLKRAGET:
593 	case BLKFRAGET:
594 		if (!argp)
595 			return -EINVAL;
596 		return put_long(argp, (bdev->bd_bdi->ra_pages*PAGE_SIZE) / 512);
597 	case BLKGETSIZE:
598 		size = i_size_read(bdev->bd_inode);
599 		if ((size >> 9) > ~0UL)
600 			return -EFBIG;
601 		return put_ulong(argp, size >> 9);
602 
603 	/* The data is compatible, but the command number is different */
604 	case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
605 		return put_int(argp, block_size(bdev));
606 	case BLKBSZSET:
607 		return blkdev_bszset(bdev, mode, argp);
608 	case BLKGETSIZE64:
609 		return put_u64(argp, i_size_read(bdev->bd_inode));
610 
611 	/* Incompatible alignment on i386 */
612 	case BLKTRACESETUP:
613 		return blk_trace_ioctl(bdev, cmd, argp);
614 	default:
615 		break;
616 	}
617 
618 	ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
619 	if (ret == -ENOIOCTLCMD)
620 		return __blkdev_driver_ioctl(bdev, mode, cmd, arg);
621 
622 	return ret;
623 }
624 EXPORT_SYMBOL_GPL(blkdev_ioctl); /* for /dev/raw */
625 
626 #ifdef CONFIG_COMPAT
627 
628 #define BLKBSZGET_32		_IOR(0x12, 112, int)
629 #define BLKBSZSET_32		_IOW(0x12, 113, int)
630 #define BLKGETSIZE64_32		_IOR(0x12, 114, int)
631 
632 /* Most of the generic ioctls are handled in the normal fallback path.
633    This assumes the blkdev's low level compat_ioctl always returns
634    ENOIOCTLCMD for unknown ioctls. */
635 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
636 {
637 	int ret;
638 	void __user *argp = compat_ptr(arg);
639 	struct inode *inode = file->f_mapping->host;
640 	struct block_device *bdev = inode->i_bdev;
641 	struct gendisk *disk = bdev->bd_disk;
642 	fmode_t mode = file->f_mode;
643 	loff_t size;
644 
645 	/*
646 	 * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
647 	 * to updated it before every ioctl.
648 	 */
649 	if (file->f_flags & O_NDELAY)
650 		mode |= FMODE_NDELAY;
651 	else
652 		mode &= ~FMODE_NDELAY;
653 
654 	switch (cmd) {
655 	/* These need separate implementations for the data structure */
656 	case HDIO_GETGEO:
657 		return compat_hdio_getgeo(bdev, argp);
658 	case BLKPG:
659 		return compat_blkpg_ioctl(bdev, argp);
660 
661 	/* Compat mode returns 32-bit data instead of 'long' */
662 	case BLKRAGET:
663 	case BLKFRAGET:
664 		if (!argp)
665 			return -EINVAL;
666 		return compat_put_long(argp,
667 			       (bdev->bd_bdi->ra_pages * PAGE_SIZE) / 512);
668 	case BLKGETSIZE:
669 		size = i_size_read(bdev->bd_inode);
670 		if ((size >> 9) > ~0UL)
671 			return -EFBIG;
672 		return compat_put_ulong(argp, size >> 9);
673 
674 	/* The data is compatible, but the command number is different */
675 	case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
676 		return put_int(argp, bdev_logical_block_size(bdev));
677 	case BLKBSZSET_32:
678 		return blkdev_bszset(bdev, mode, argp);
679 	case BLKGETSIZE64_32:
680 		return put_u64(argp, i_size_read(bdev->bd_inode));
681 
682 	/* Incompatible alignment on i386 */
683 	case BLKTRACESETUP32:
684 		return blk_trace_ioctl(bdev, cmd, argp);
685 	default:
686 		break;
687 	}
688 
689 	ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
690 	if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
691 		ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
692 
693 	return ret;
694 }
695 #endif
696