xref: /openbmc/linux/block/ioctl.c (revision 93696d8f) 
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 	sector_t 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 	if (p.start < 0 || p.length <= 0 || LLONG_MAX - p.length < p.start)
37 		return -EINVAL;
38 	/* Check that the partition is aligned to the block size */
39 	if (!IS_ALIGNED(p.start | p.length, bdev_logical_block_size(bdev)))
40 		return -EINVAL;
41 
42 	start = p.start >> SECTOR_SHIFT;
43 	length = p.length >> SECTOR_SHIFT;
44 
45 	switch (op) {
46 	case BLKPG_ADD_PARTITION:
47 		return bdev_add_partition(disk, p.pno, start, length);
48 	case BLKPG_RESIZE_PARTITION:
49 		return bdev_resize_partition(disk, p.pno, start, length);
50 	default:
51 		return -EINVAL;
52 	}
53 }
54 
55 static int blkpg_ioctl(struct block_device *bdev,
56 		       struct blkpg_ioctl_arg __user *arg)
57 {
58 	struct blkpg_partition __user *udata;
59 	int op;
60 
61 	if (get_user(op, &arg->op) || get_user(udata, &arg->data))
62 		return -EFAULT;
63 
64 	return blkpg_do_ioctl(bdev, udata, op);
65 }
66 
67 #ifdef CONFIG_COMPAT
68 struct compat_blkpg_ioctl_arg {
69 	compat_int_t op;
70 	compat_int_t flags;
71 	compat_int_t datalen;
72 	compat_caddr_t data;
73 };
74 
75 static int compat_blkpg_ioctl(struct block_device *bdev,
76 			      struct compat_blkpg_ioctl_arg __user *arg)
77 {
78 	compat_caddr_t udata;
79 	int op;
80 
81 	if (get_user(op, &arg->op) || get_user(udata, &arg->data))
82 		return -EFAULT;
83 
84 	return blkpg_do_ioctl(bdev, compat_ptr(udata), op);
85 }
86 #endif
87 
88 static int blk_ioctl_discard(struct block_device *bdev, blk_mode_t mode,
89 		unsigned long arg)
90 {
91 	uint64_t range[2];
92 	uint64_t start, len, end;
93 	struct inode *inode = bdev->bd_inode;
94 	int err;
95 
96 	if (!(mode & BLK_OPEN_WRITE))
97 		return -EBADF;
98 
99 	if (!bdev_max_discard_sectors(bdev))
100 		return -EOPNOTSUPP;
101 
102 	if (copy_from_user(range, (void __user *)arg, sizeof(range)))
103 		return -EFAULT;
104 
105 	start = range[0];
106 	len = range[1];
107 
108 	if (start & 511)
109 		return -EINVAL;
110 	if (len & 511)
111 		return -EINVAL;
112 
113 	if (check_add_overflow(start, len, &end) ||
114 	    end > bdev_nr_bytes(bdev))
115 		return -EINVAL;
116 
117 	filemap_invalidate_lock(inode->i_mapping);
118 	err = truncate_bdev_range(bdev, mode, start, start + len - 1);
119 	if (err)
120 		goto fail;
121 	err = blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL);
122 fail:
123 	filemap_invalidate_unlock(inode->i_mapping);
124 	return err;
125 }
126 
127 static int blk_ioctl_secure_erase(struct block_device *bdev, blk_mode_t mode,
128 		void __user *argp)
129 {
130 	uint64_t start, len;
131 	uint64_t range[2];
132 	int err;
133 
134 	if (!(mode & BLK_OPEN_WRITE))
135 		return -EBADF;
136 	if (!bdev_max_secure_erase_sectors(bdev))
137 		return -EOPNOTSUPP;
138 	if (copy_from_user(range, argp, sizeof(range)))
139 		return -EFAULT;
140 
141 	start = range[0];
142 	len = range[1];
143 	if ((start & 511) || (len & 511))
144 		return -EINVAL;
145 	if (start + len > bdev_nr_bytes(bdev))
146 		return -EINVAL;
147 
148 	filemap_invalidate_lock(bdev->bd_inode->i_mapping);
149 	err = truncate_bdev_range(bdev, mode, start, start + len - 1);
150 	if (!err)
151 		err = blkdev_issue_secure_erase(bdev, start >> 9, len >> 9,
152 						GFP_KERNEL);
153 	filemap_invalidate_unlock(bdev->bd_inode->i_mapping);
154 	return err;
155 }
156 
157 
158 static int blk_ioctl_zeroout(struct block_device *bdev, blk_mode_t mode,
159 		unsigned long arg)
160 {
161 	uint64_t range[2];
162 	uint64_t start, end, len;
163 	struct inode *inode = bdev->bd_inode;
164 	int err;
165 
166 	if (!(mode & BLK_OPEN_WRITE))
167 		return -EBADF;
168 
169 	if (copy_from_user(range, (void __user *)arg, sizeof(range)))
170 		return -EFAULT;
171 
172 	start = range[0];
173 	len = range[1];
174 	end = start + len - 1;
175 
176 	if (start & 511)
177 		return -EINVAL;
178 	if (len & 511)
179 		return -EINVAL;
180 	if (end >= (uint64_t)bdev_nr_bytes(bdev))
181 		return -EINVAL;
182 	if (end < start)
183 		return -EINVAL;
184 
185 	/* Invalidate the page cache, including dirty pages */
186 	filemap_invalidate_lock(inode->i_mapping);
187 	err = truncate_bdev_range(bdev, mode, start, end);
188 	if (err)
189 		goto fail;
190 
191 	err = blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL,
192 				   BLKDEV_ZERO_NOUNMAP);
193 
194 fail:
195 	filemap_invalidate_unlock(inode->i_mapping);
196 	return err;
197 }
198 
199 static int put_ushort(unsigned short __user *argp, unsigned short val)
200 {
201 	return put_user(val, argp);
202 }
203 
204 static int put_int(int __user *argp, int val)
205 {
206 	return put_user(val, argp);
207 }
208 
209 static int put_uint(unsigned int __user *argp, unsigned int val)
210 {
211 	return put_user(val, argp);
212 }
213 
214 static int put_long(long __user *argp, long val)
215 {
216 	return put_user(val, argp);
217 }
218 
219 static int put_ulong(unsigned long __user *argp, unsigned long val)
220 {
221 	return put_user(val, argp);
222 }
223 
224 static int put_u64(u64 __user *argp, u64 val)
225 {
226 	return put_user(val, argp);
227 }
228 
229 #ifdef CONFIG_COMPAT
230 static int compat_put_long(compat_long_t __user *argp, long val)
231 {
232 	return put_user(val, argp);
233 }
234 
235 static int compat_put_ulong(compat_ulong_t __user *argp, compat_ulong_t val)
236 {
237 	return put_user(val, argp);
238 }
239 #endif
240 
241 #ifdef CONFIG_COMPAT
242 /*
243  * This is the equivalent of compat_ptr_ioctl(), to be used by block
244  * drivers that implement only commands that are completely compatible
245  * between 32-bit and 64-bit user space
246  */
247 int blkdev_compat_ptr_ioctl(struct block_device *bdev, blk_mode_t mode,
248 			unsigned cmd, unsigned long arg)
249 {
250 	struct gendisk *disk = bdev->bd_disk;
251 
252 	if (disk->fops->ioctl)
253 		return disk->fops->ioctl(bdev, mode, cmd,
254 					 (unsigned long)compat_ptr(arg));
255 
256 	return -ENOIOCTLCMD;
257 }
258 EXPORT_SYMBOL(blkdev_compat_ptr_ioctl);
259 #endif
260 
261 static bool blkdev_pr_allowed(struct block_device *bdev, blk_mode_t mode)
262 {
263 	/* no sense to make reservations for partitions */
264 	if (bdev_is_partition(bdev))
265 		return false;
266 
267 	if (capable(CAP_SYS_ADMIN))
268 		return true;
269 	/*
270 	 * Only allow unprivileged reservations if the file descriptor is open
271 	 * for writing.
272 	 */
273 	return mode & BLK_OPEN_WRITE;
274 }
275 
276 static int blkdev_pr_register(struct block_device *bdev, blk_mode_t mode,
277 		struct pr_registration __user *arg)
278 {
279 	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
280 	struct pr_registration reg;
281 
282 	if (!blkdev_pr_allowed(bdev, mode))
283 		return -EPERM;
284 	if (!ops || !ops->pr_register)
285 		return -EOPNOTSUPP;
286 	if (copy_from_user(&reg, arg, sizeof(reg)))
287 		return -EFAULT;
288 
289 	if (reg.flags & ~PR_FL_IGNORE_KEY)
290 		return -EOPNOTSUPP;
291 	return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags);
292 }
293 
294 static int blkdev_pr_reserve(struct block_device *bdev, blk_mode_t mode,
295 		struct pr_reservation __user *arg)
296 {
297 	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
298 	struct pr_reservation rsv;
299 
300 	if (!blkdev_pr_allowed(bdev, mode))
301 		return -EPERM;
302 	if (!ops || !ops->pr_reserve)
303 		return -EOPNOTSUPP;
304 	if (copy_from_user(&rsv, arg, sizeof(rsv)))
305 		return -EFAULT;
306 
307 	if (rsv.flags & ~PR_FL_IGNORE_KEY)
308 		return -EOPNOTSUPP;
309 	return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags);
310 }
311 
312 static int blkdev_pr_release(struct block_device *bdev, blk_mode_t mode,
313 		struct pr_reservation __user *arg)
314 {
315 	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
316 	struct pr_reservation rsv;
317 
318 	if (!blkdev_pr_allowed(bdev, mode))
319 		return -EPERM;
320 	if (!ops || !ops->pr_release)
321 		return -EOPNOTSUPP;
322 	if (copy_from_user(&rsv, arg, sizeof(rsv)))
323 		return -EFAULT;
324 
325 	if (rsv.flags)
326 		return -EOPNOTSUPP;
327 	return ops->pr_release(bdev, rsv.key, rsv.type);
328 }
329 
330 static int blkdev_pr_preempt(struct block_device *bdev, blk_mode_t mode,
331 		struct pr_preempt __user *arg, bool abort)
332 {
333 	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
334 	struct pr_preempt p;
335 
336 	if (!blkdev_pr_allowed(bdev, mode))
337 		return -EPERM;
338 	if (!ops || !ops->pr_preempt)
339 		return -EOPNOTSUPP;
340 	if (copy_from_user(&p, arg, sizeof(p)))
341 		return -EFAULT;
342 
343 	if (p.flags)
344 		return -EOPNOTSUPP;
345 	return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort);
346 }
347 
348 static int blkdev_pr_clear(struct block_device *bdev, blk_mode_t mode,
349 		struct pr_clear __user *arg)
350 {
351 	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
352 	struct pr_clear c;
353 
354 	if (!blkdev_pr_allowed(bdev, mode))
355 		return -EPERM;
356 	if (!ops || !ops->pr_clear)
357 		return -EOPNOTSUPP;
358 	if (copy_from_user(&c, arg, sizeof(c)))
359 		return -EFAULT;
360 
361 	if (c.flags)
362 		return -EOPNOTSUPP;
363 	return ops->pr_clear(bdev, c.key);
364 }
365 
366 static int blkdev_flushbuf(struct block_device *bdev, unsigned cmd,
367 		unsigned long arg)
368 {
369 	if (!capable(CAP_SYS_ADMIN))
370 		return -EACCES;
371 
372 	mutex_lock(&bdev->bd_holder_lock);
373 	if (bdev->bd_holder_ops && bdev->bd_holder_ops->sync)
374 		bdev->bd_holder_ops->sync(bdev);
375 	else
376 		sync_blockdev(bdev);
377 	mutex_unlock(&bdev->bd_holder_lock);
378 
379 	invalidate_bdev(bdev);
380 	return 0;
381 }
382 
383 static int blkdev_roset(struct block_device *bdev, unsigned cmd,
384 		unsigned long arg)
385 {
386 	int ret, n;
387 
388 	if (!capable(CAP_SYS_ADMIN))
389 		return -EACCES;
390 
391 	if (get_user(n, (int __user *)arg))
392 		return -EFAULT;
393 	if (bdev->bd_disk->fops->set_read_only) {
394 		ret = bdev->bd_disk->fops->set_read_only(bdev, n);
395 		if (ret)
396 			return ret;
397 	}
398 	bdev->bd_read_only = n;
399 	return 0;
400 }
401 
402 static int blkdev_getgeo(struct block_device *bdev,
403 		struct hd_geometry __user *argp)
404 {
405 	struct gendisk *disk = bdev->bd_disk;
406 	struct hd_geometry geo;
407 	int ret;
408 
409 	if (!argp)
410 		return -EINVAL;
411 	if (!disk->fops->getgeo)
412 		return -ENOTTY;
413 
414 	/*
415 	 * We need to set the startsect first, the driver may
416 	 * want to override it.
417 	 */
418 	memset(&geo, 0, sizeof(geo));
419 	geo.start = get_start_sect(bdev);
420 	ret = disk->fops->getgeo(bdev, &geo);
421 	if (ret)
422 		return ret;
423 	if (copy_to_user(argp, &geo, sizeof(geo)))
424 		return -EFAULT;
425 	return 0;
426 }
427 
428 #ifdef CONFIG_COMPAT
429 struct compat_hd_geometry {
430 	unsigned char heads;
431 	unsigned char sectors;
432 	unsigned short cylinders;
433 	u32 start;
434 };
435 
436 static int compat_hdio_getgeo(struct block_device *bdev,
437 			      struct compat_hd_geometry __user *ugeo)
438 {
439 	struct gendisk *disk = bdev->bd_disk;
440 	struct hd_geometry geo;
441 	int ret;
442 
443 	if (!ugeo)
444 		return -EINVAL;
445 	if (!disk->fops->getgeo)
446 		return -ENOTTY;
447 
448 	memset(&geo, 0, sizeof(geo));
449 	/*
450 	 * We need to set the startsect first, the driver may
451 	 * want to override it.
452 	 */
453 	geo.start = get_start_sect(bdev);
454 	ret = disk->fops->getgeo(bdev, &geo);
455 	if (ret)
456 		return ret;
457 
458 	ret = copy_to_user(ugeo, &geo, 4);
459 	ret |= put_user(geo.start, &ugeo->start);
460 	if (ret)
461 		ret = -EFAULT;
462 
463 	return ret;
464 }
465 #endif
466 
467 /* set the logical block size */
468 static int blkdev_bszset(struct block_device *bdev, blk_mode_t mode,
469 		int __user *argp)
470 {
471 	int ret, n;
472 
473 	if (!capable(CAP_SYS_ADMIN))
474 		return -EACCES;
475 	if (!argp)
476 		return -EINVAL;
477 	if (get_user(n, argp))
478 		return -EFAULT;
479 
480 	if (mode & BLK_OPEN_EXCL)
481 		return set_blocksize(bdev, n);
482 
483 	if (IS_ERR(blkdev_get_by_dev(bdev->bd_dev, mode, &bdev, NULL)))
484 		return -EBUSY;
485 	ret = set_blocksize(bdev, n);
486 	blkdev_put(bdev, &bdev);
487 
488 	return ret;
489 }
490 
491 /*
492  * Common commands that are handled the same way on native and compat
493  * user space. Note the separate arg/argp parameters that are needed
494  * to deal with the compat_ptr() conversion.
495  */
496 static int blkdev_common_ioctl(struct block_device *bdev, blk_mode_t mode,
497 			       unsigned int cmd, unsigned long arg,
498 			       void __user *argp)
499 {
500 	unsigned int max_sectors;
501 
502 	switch (cmd) {
503 	case BLKFLSBUF:
504 		return blkdev_flushbuf(bdev, cmd, arg);
505 	case BLKROSET:
506 		return blkdev_roset(bdev, cmd, arg);
507 	case BLKDISCARD:
508 		return blk_ioctl_discard(bdev, mode, arg);
509 	case BLKSECDISCARD:
510 		return blk_ioctl_secure_erase(bdev, mode, argp);
511 	case BLKZEROOUT:
512 		return blk_ioctl_zeroout(bdev, mode, arg);
513 	case BLKGETDISKSEQ:
514 		return put_u64(argp, bdev->bd_disk->diskseq);
515 	case BLKREPORTZONE:
516 		return blkdev_report_zones_ioctl(bdev, cmd, arg);
517 	case BLKRESETZONE:
518 	case BLKOPENZONE:
519 	case BLKCLOSEZONE:
520 	case BLKFINISHZONE:
521 		return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg);
522 	case BLKGETZONESZ:
523 		return put_uint(argp, bdev_zone_sectors(bdev));
524 	case BLKGETNRZONES:
525 		return put_uint(argp, bdev_nr_zones(bdev));
526 	case BLKROGET:
527 		return put_int(argp, bdev_read_only(bdev) != 0);
528 	case BLKSSZGET: /* get block device logical block size */
529 		return put_int(argp, bdev_logical_block_size(bdev));
530 	case BLKPBSZGET: /* get block device physical block size */
531 		return put_uint(argp, bdev_physical_block_size(bdev));
532 	case BLKIOMIN:
533 		return put_uint(argp, bdev_io_min(bdev));
534 	case BLKIOOPT:
535 		return put_uint(argp, bdev_io_opt(bdev));
536 	case BLKALIGNOFF:
537 		return put_int(argp, bdev_alignment_offset(bdev));
538 	case BLKDISCARDZEROES:
539 		return put_uint(argp, 0);
540 	case BLKSECTGET:
541 		max_sectors = min_t(unsigned int, USHRT_MAX,
542 				    queue_max_sectors(bdev_get_queue(bdev)));
543 		return put_ushort(argp, max_sectors);
544 	case BLKROTATIONAL:
545 		return put_ushort(argp, !bdev_nonrot(bdev));
546 	case BLKRASET:
547 	case BLKFRASET:
548 		if(!capable(CAP_SYS_ADMIN))
549 			return -EACCES;
550 		bdev->bd_disk->bdi->ra_pages = (arg * 512) / PAGE_SIZE;
551 		return 0;
552 	case BLKRRPART:
553 		if (!capable(CAP_SYS_ADMIN))
554 			return -EACCES;
555 		if (bdev_is_partition(bdev))
556 			return -EINVAL;
557 		return disk_scan_partitions(bdev->bd_disk, mode);
558 	case BLKTRACESTART:
559 	case BLKTRACESTOP:
560 	case BLKTRACETEARDOWN:
561 		return blk_trace_ioctl(bdev, cmd, argp);
562 	case IOC_PR_REGISTER:
563 		return blkdev_pr_register(bdev, mode, argp);
564 	case IOC_PR_RESERVE:
565 		return blkdev_pr_reserve(bdev, mode, argp);
566 	case IOC_PR_RELEASE:
567 		return blkdev_pr_release(bdev, mode, argp);
568 	case IOC_PR_PREEMPT:
569 		return blkdev_pr_preempt(bdev, mode, argp, false);
570 	case IOC_PR_PREEMPT_ABORT:
571 		return blkdev_pr_preempt(bdev, mode, argp, true);
572 	case IOC_PR_CLEAR:
573 		return blkdev_pr_clear(bdev, mode, argp);
574 	default:
575 		return -ENOIOCTLCMD;
576 	}
577 }
578 
579 /*
580  * Always keep this in sync with compat_blkdev_ioctl()
581  * to handle all incompatible commands in both functions.
582  *
583  * New commands must be compatible and go into blkdev_common_ioctl
584  */
585 long blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
586 {
587 	struct block_device *bdev = I_BDEV(file->f_mapping->host);
588 	void __user *argp = (void __user *)arg;
589 	blk_mode_t mode = file_to_blk_mode(file);
590 	int ret;
591 
592 	switch (cmd) {
593 	/* These need separate implementations for the data structure */
594 	case HDIO_GETGEO:
595 		return blkdev_getgeo(bdev, argp);
596 	case BLKPG:
597 		return blkpg_ioctl(bdev, argp);
598 
599 	/* Compat mode returns 32-bit data instead of 'long' */
600 	case BLKRAGET:
601 	case BLKFRAGET:
602 		if (!argp)
603 			return -EINVAL;
604 		return put_long(argp,
605 			(bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512);
606 	case BLKGETSIZE:
607 		if (bdev_nr_sectors(bdev) > ~0UL)
608 			return -EFBIG;
609 		return put_ulong(argp, bdev_nr_sectors(bdev));
610 
611 	/* The data is compatible, but the command number is different */
612 	case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
613 		return put_int(argp, block_size(bdev));
614 	case BLKBSZSET:
615 		return blkdev_bszset(bdev, mode, argp);
616 	case BLKGETSIZE64:
617 		return put_u64(argp, bdev_nr_bytes(bdev));
618 
619 	/* Incompatible alignment on i386 */
620 	case BLKTRACESETUP:
621 		return blk_trace_ioctl(bdev, cmd, argp);
622 	default:
623 		break;
624 	}
625 
626 	ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
627 	if (ret != -ENOIOCTLCMD)
628 		return ret;
629 
630 	if (!bdev->bd_disk->fops->ioctl)
631 		return -ENOTTY;
632 	return bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg);
633 }
634 
635 #ifdef CONFIG_COMPAT
636 
637 #define BLKBSZGET_32		_IOR(0x12, 112, int)
638 #define BLKBSZSET_32		_IOW(0x12, 113, int)
639 #define BLKGETSIZE64_32		_IOR(0x12, 114, int)
640 
641 /* Most of the generic ioctls are handled in the normal fallback path.
642    This assumes the blkdev's low level compat_ioctl always returns
643    ENOIOCTLCMD for unknown ioctls. */
644 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
645 {
646 	int ret;
647 	void __user *argp = compat_ptr(arg);
648 	struct block_device *bdev = I_BDEV(file->f_mapping->host);
649 	struct gendisk *disk = bdev->bd_disk;
650 	blk_mode_t mode = file_to_blk_mode(file);
651 
652 	switch (cmd) {
653 	/* These need separate implementations for the data structure */
654 	case HDIO_GETGEO:
655 		return compat_hdio_getgeo(bdev, argp);
656 	case BLKPG:
657 		return compat_blkpg_ioctl(bdev, argp);
658 
659 	/* Compat mode returns 32-bit data instead of 'long' */
660 	case BLKRAGET:
661 	case BLKFRAGET:
662 		if (!argp)
663 			return -EINVAL;
664 		return compat_put_long(argp,
665 			(bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512);
666 	case BLKGETSIZE:
667 		if (bdev_nr_sectors(bdev) > ~(compat_ulong_t)0)
668 			return -EFBIG;
669 		return compat_put_ulong(argp, bdev_nr_sectors(bdev));
670 
671 	/* The data is compatible, but the command number is different */
672 	case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
673 		return put_int(argp, bdev_logical_block_size(bdev));
674 	case BLKBSZSET_32:
675 		return blkdev_bszset(bdev, mode, argp);
676 	case BLKGETSIZE64_32:
677 		return put_u64(argp, bdev_nr_bytes(bdev));
678 
679 	/* Incompatible alignment on i386 */
680 	case BLKTRACESETUP32:
681 		return blk_trace_ioctl(bdev, cmd, argp);
682 	default:
683 		break;
684 	}
685 
686 	ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
687 	if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
688 		ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
689 
690 	return ret;
691 }
692 #endif
693