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
blkpg_do_ioctl(struct block_device * bdev,struct blkpg_partition __user * upart,int op)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 || p.start + p.length < 0)
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
blkpg_ioctl(struct block_device * bdev,struct blkpg_ioctl_arg __user * arg)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
compat_blkpg_ioctl(struct block_device * bdev,struct compat_blkpg_ioctl_arg __user * arg)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
blk_ioctl_discard(struct block_device * bdev,blk_mode_t mode,unsigned long arg)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;
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 (start + len > bdev_nr_bytes(bdev))
114 return -EINVAL;
115
116 filemap_invalidate_lock(inode->i_mapping);
117 err = truncate_bdev_range(bdev, mode, start, start + len - 1);
118 if (err)
119 goto fail;
120 err = blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL);
121 fail:
122 filemap_invalidate_unlock(inode->i_mapping);
123 return err;
124 }
125
blk_ioctl_secure_erase(struct block_device * bdev,blk_mode_t mode,void __user * argp)126 static int blk_ioctl_secure_erase(struct block_device *bdev, blk_mode_t mode,
127 void __user *argp)
128 {
129 uint64_t start, len;
130 uint64_t range[2];
131 int err;
132
133 if (!(mode & BLK_OPEN_WRITE))
134 return -EBADF;
135 if (!bdev_max_secure_erase_sectors(bdev))
136 return -EOPNOTSUPP;
137 if (copy_from_user(range, argp, sizeof(range)))
138 return -EFAULT;
139
140 start = range[0];
141 len = range[1];
142 if ((start & 511) || (len & 511))
143 return -EINVAL;
144 if (start + len > bdev_nr_bytes(bdev))
145 return -EINVAL;
146
147 filemap_invalidate_lock(bdev->bd_inode->i_mapping);
148 err = truncate_bdev_range(bdev, mode, start, start + len - 1);
149 if (!err)
150 err = blkdev_issue_secure_erase(bdev, start >> 9, len >> 9,
151 GFP_KERNEL);
152 filemap_invalidate_unlock(bdev->bd_inode->i_mapping);
153 return err;
154 }
155
156
blk_ioctl_zeroout(struct block_device * bdev,blk_mode_t mode,unsigned long arg)157 static int blk_ioctl_zeroout(struct block_device *bdev, blk_mode_t mode,
158 unsigned long arg)
159 {
160 uint64_t range[2];
161 uint64_t start, end, len;
162 struct inode *inode = bdev->bd_inode;
163 int err;
164
165 if (!(mode & BLK_OPEN_WRITE))
166 return -EBADF;
167
168 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
169 return -EFAULT;
170
171 start = range[0];
172 len = range[1];
173 end = start + len - 1;
174
175 if (start & 511)
176 return -EINVAL;
177 if (len & 511)
178 return -EINVAL;
179 if (end >= (uint64_t)bdev_nr_bytes(bdev))
180 return -EINVAL;
181 if (end < start)
182 return -EINVAL;
183
184 /* Invalidate the page cache, including dirty pages */
185 filemap_invalidate_lock(inode->i_mapping);
186 err = truncate_bdev_range(bdev, mode, start, end);
187 if (err)
188 goto fail;
189
190 err = blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL,
191 BLKDEV_ZERO_NOUNMAP);
192
193 fail:
194 filemap_invalidate_unlock(inode->i_mapping);
195 return err;
196 }
197
put_ushort(unsigned short __user * argp,unsigned short val)198 static int put_ushort(unsigned short __user *argp, unsigned short val)
199 {
200 return put_user(val, argp);
201 }
202
put_int(int __user * argp,int val)203 static int put_int(int __user *argp, int val)
204 {
205 return put_user(val, argp);
206 }
207
put_uint(unsigned int __user * argp,unsigned int val)208 static int put_uint(unsigned int __user *argp, unsigned int val)
209 {
210 return put_user(val, argp);
211 }
212
put_long(long __user * argp,long val)213 static int put_long(long __user *argp, long val)
214 {
215 return put_user(val, argp);
216 }
217
put_ulong(unsigned long __user * argp,unsigned long val)218 static int put_ulong(unsigned long __user *argp, unsigned long val)
219 {
220 return put_user(val, argp);
221 }
222
put_u64(u64 __user * argp,u64 val)223 static int put_u64(u64 __user *argp, u64 val)
224 {
225 return put_user(val, argp);
226 }
227
228 #ifdef CONFIG_COMPAT
compat_put_long(compat_long_t __user * argp,long val)229 static int compat_put_long(compat_long_t __user *argp, long val)
230 {
231 return put_user(val, argp);
232 }
233
compat_put_ulong(compat_ulong_t __user * argp,compat_ulong_t val)234 static int compat_put_ulong(compat_ulong_t __user *argp, compat_ulong_t val)
235 {
236 return put_user(val, argp);
237 }
238 #endif
239
240 #ifdef CONFIG_COMPAT
241 /*
242 * This is the equivalent of compat_ptr_ioctl(), to be used by block
243 * drivers that implement only commands that are completely compatible
244 * between 32-bit and 64-bit user space
245 */
blkdev_compat_ptr_ioctl(struct block_device * bdev,blk_mode_t mode,unsigned cmd,unsigned long arg)246 int blkdev_compat_ptr_ioctl(struct block_device *bdev, blk_mode_t mode,
247 unsigned cmd, unsigned long arg)
248 {
249 struct gendisk *disk = bdev->bd_disk;
250
251 if (disk->fops->ioctl)
252 return disk->fops->ioctl(bdev, mode, cmd,
253 (unsigned long)compat_ptr(arg));
254
255 return -ENOIOCTLCMD;
256 }
257 EXPORT_SYMBOL(blkdev_compat_ptr_ioctl);
258 #endif
259
blkdev_pr_allowed(struct block_device * bdev,blk_mode_t mode)260 static bool blkdev_pr_allowed(struct block_device *bdev, blk_mode_t mode)
261 {
262 /* no sense to make reservations for partitions */
263 if (bdev_is_partition(bdev))
264 return false;
265
266 if (capable(CAP_SYS_ADMIN))
267 return true;
268 /*
269 * Only allow unprivileged reservations if the file descriptor is open
270 * for writing.
271 */
272 return mode & BLK_OPEN_WRITE;
273 }
274
blkdev_pr_register(struct block_device * bdev,blk_mode_t mode,struct pr_registration __user * arg)275 static int blkdev_pr_register(struct block_device *bdev, blk_mode_t mode,
276 struct pr_registration __user *arg)
277 {
278 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
279 struct pr_registration reg;
280
281 if (!blkdev_pr_allowed(bdev, mode))
282 return -EPERM;
283 if (!ops || !ops->pr_register)
284 return -EOPNOTSUPP;
285 if (copy_from_user(®, arg, sizeof(reg)))
286 return -EFAULT;
287
288 if (reg.flags & ~PR_FL_IGNORE_KEY)
289 return -EOPNOTSUPP;
290 return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags);
291 }
292
blkdev_pr_reserve(struct block_device * bdev,blk_mode_t mode,struct pr_reservation __user * arg)293 static int blkdev_pr_reserve(struct block_device *bdev, blk_mode_t mode,
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 (!blkdev_pr_allowed(bdev, mode))
300 return -EPERM;
301 if (!ops || !ops->pr_reserve)
302 return -EOPNOTSUPP;
303 if (copy_from_user(&rsv, arg, sizeof(rsv)))
304 return -EFAULT;
305
306 if (rsv.flags & ~PR_FL_IGNORE_KEY)
307 return -EOPNOTSUPP;
308 return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags);
309 }
310
blkdev_pr_release(struct block_device * bdev,blk_mode_t mode,struct pr_reservation __user * arg)311 static int blkdev_pr_release(struct block_device *bdev, blk_mode_t mode,
312 struct pr_reservation __user *arg)
313 {
314 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
315 struct pr_reservation rsv;
316
317 if (!blkdev_pr_allowed(bdev, mode))
318 return -EPERM;
319 if (!ops || !ops->pr_release)
320 return -EOPNOTSUPP;
321 if (copy_from_user(&rsv, arg, sizeof(rsv)))
322 return -EFAULT;
323
324 if (rsv.flags)
325 return -EOPNOTSUPP;
326 return ops->pr_release(bdev, rsv.key, rsv.type);
327 }
328
blkdev_pr_preempt(struct block_device * bdev,blk_mode_t mode,struct pr_preempt __user * arg,bool abort)329 static int blkdev_pr_preempt(struct block_device *bdev, blk_mode_t mode,
330 struct pr_preempt __user *arg, bool abort)
331 {
332 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
333 struct pr_preempt p;
334
335 if (!blkdev_pr_allowed(bdev, mode))
336 return -EPERM;
337 if (!ops || !ops->pr_preempt)
338 return -EOPNOTSUPP;
339 if (copy_from_user(&p, arg, sizeof(p)))
340 return -EFAULT;
341
342 if (p.flags)
343 return -EOPNOTSUPP;
344 return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort);
345 }
346
blkdev_pr_clear(struct block_device * bdev,blk_mode_t mode,struct pr_clear __user * arg)347 static int blkdev_pr_clear(struct block_device *bdev, blk_mode_t mode,
348 struct pr_clear __user *arg)
349 {
350 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
351 struct pr_clear c;
352
353 if (!blkdev_pr_allowed(bdev, mode))
354 return -EPERM;
355 if (!ops || !ops->pr_clear)
356 return -EOPNOTSUPP;
357 if (copy_from_user(&c, arg, sizeof(c)))
358 return -EFAULT;
359
360 if (c.flags)
361 return -EOPNOTSUPP;
362 return ops->pr_clear(bdev, c.key);
363 }
364
blkdev_flushbuf(struct block_device * bdev,unsigned cmd,unsigned long arg)365 static int blkdev_flushbuf(struct block_device *bdev, unsigned cmd,
366 unsigned long arg)
367 {
368 if (!capable(CAP_SYS_ADMIN))
369 return -EACCES;
370
371 mutex_lock(&bdev->bd_holder_lock);
372 if (bdev->bd_holder_ops && bdev->bd_holder_ops->sync)
373 bdev->bd_holder_ops->sync(bdev);
374 else {
375 mutex_unlock(&bdev->bd_holder_lock);
376 sync_blockdev(bdev);
377 }
378
379 invalidate_bdev(bdev);
380 return 0;
381 }
382
blkdev_roset(struct block_device * bdev,unsigned cmd,unsigned long arg)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
blkdev_getgeo(struct block_device * bdev,struct hd_geometry __user * argp)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
compat_hdio_getgeo(struct block_device * bdev,struct compat_hd_geometry __user * ugeo)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 */
blkdev_bszset(struct block_device * bdev,blk_mode_t mode,int __user * argp)468 static int blkdev_bszset(struct block_device *bdev, blk_mode_t mode,
469 int __user *argp)
470 {
471 int ret, n;
472 struct bdev_handle *handle;
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 & BLK_OPEN_EXCL)
482 return set_blocksize(bdev, n);
483
484 handle = bdev_open_by_dev(bdev->bd_dev, mode, &bdev, NULL);
485 if (IS_ERR(handle))
486 return -EBUSY;
487 ret = set_blocksize(bdev, n);
488 bdev_release(handle);
489
490 return ret;
491 }
492
493 /*
494 * Common commands that are handled the same way on native and compat
495 * user space. Note the separate arg/argp parameters that are needed
496 * to deal with the compat_ptr() conversion.
497 */
blkdev_common_ioctl(struct block_device * bdev,blk_mode_t mode,unsigned int cmd,unsigned long arg,void __user * argp)498 static int blkdev_common_ioctl(struct block_device *bdev, blk_mode_t mode,
499 unsigned int cmd, unsigned long arg,
500 void __user *argp)
501 {
502 unsigned int max_sectors;
503
504 switch (cmd) {
505 case BLKFLSBUF:
506 return blkdev_flushbuf(bdev, cmd, arg);
507 case BLKROSET:
508 return blkdev_roset(bdev, cmd, arg);
509 case BLKDISCARD:
510 return blk_ioctl_discard(bdev, mode, arg);
511 case BLKSECDISCARD:
512 return blk_ioctl_secure_erase(bdev, mode, argp);
513 case BLKZEROOUT:
514 return blk_ioctl_zeroout(bdev, mode, arg);
515 case BLKGETDISKSEQ:
516 return put_u64(argp, bdev->bd_disk->diskseq);
517 case BLKREPORTZONE:
518 return blkdev_report_zones_ioctl(bdev, cmd, arg);
519 case BLKRESETZONE:
520 case BLKOPENZONE:
521 case BLKCLOSEZONE:
522 case BLKFINISHZONE:
523 return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg);
524 case BLKGETZONESZ:
525 return put_uint(argp, bdev_zone_sectors(bdev));
526 case BLKGETNRZONES:
527 return put_uint(argp, bdev_nr_zones(bdev));
528 case BLKROGET:
529 return put_int(argp, bdev_read_only(bdev) != 0);
530 case BLKSSZGET: /* get block device logical block size */
531 return put_int(argp, bdev_logical_block_size(bdev));
532 case BLKPBSZGET: /* get block device physical block size */
533 return put_uint(argp, bdev_physical_block_size(bdev));
534 case BLKIOMIN:
535 return put_uint(argp, bdev_io_min(bdev));
536 case BLKIOOPT:
537 return put_uint(argp, bdev_io_opt(bdev));
538 case BLKALIGNOFF:
539 return put_int(argp, bdev_alignment_offset(bdev));
540 case BLKDISCARDZEROES:
541 return put_uint(argp, 0);
542 case BLKSECTGET:
543 max_sectors = min_t(unsigned int, USHRT_MAX,
544 queue_max_sectors(bdev_get_queue(bdev)));
545 return put_ushort(argp, max_sectors);
546 case BLKROTATIONAL:
547 return put_ushort(argp, !bdev_nonrot(bdev));
548 case BLKRASET:
549 case BLKFRASET:
550 if(!capable(CAP_SYS_ADMIN))
551 return -EACCES;
552 bdev->bd_disk->bdi->ra_pages = (arg * 512) / PAGE_SIZE;
553 return 0;
554 case BLKRRPART:
555 if (!capable(CAP_SYS_ADMIN))
556 return -EACCES;
557 if (bdev_is_partition(bdev))
558 return -EINVAL;
559 return disk_scan_partitions(bdev->bd_disk, mode);
560 case BLKTRACESTART:
561 case BLKTRACESTOP:
562 case BLKTRACETEARDOWN:
563 return blk_trace_ioctl(bdev, cmd, argp);
564 case IOC_PR_REGISTER:
565 return blkdev_pr_register(bdev, mode, argp);
566 case IOC_PR_RESERVE:
567 return blkdev_pr_reserve(bdev, mode, argp);
568 case IOC_PR_RELEASE:
569 return blkdev_pr_release(bdev, mode, argp);
570 case IOC_PR_PREEMPT:
571 return blkdev_pr_preempt(bdev, mode, argp, false);
572 case IOC_PR_PREEMPT_ABORT:
573 return blkdev_pr_preempt(bdev, mode, argp, true);
574 case IOC_PR_CLEAR:
575 return blkdev_pr_clear(bdev, mode, argp);
576 default:
577 return -ENOIOCTLCMD;
578 }
579 }
580
581 /*
582 * Always keep this in sync with compat_blkdev_ioctl()
583 * to handle all incompatible commands in both functions.
584 *
585 * New commands must be compatible and go into blkdev_common_ioctl
586 */
blkdev_ioctl(struct file * file,unsigned cmd,unsigned long arg)587 long blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
588 {
589 struct block_device *bdev = I_BDEV(file->f_mapping->host);
590 void __user *argp = (void __user *)arg;
591 blk_mode_t mode = file_to_blk_mode(file);
592 int ret;
593
594 switch (cmd) {
595 /* These need separate implementations for the data structure */
596 case HDIO_GETGEO:
597 return blkdev_getgeo(bdev, argp);
598 case BLKPG:
599 return blkpg_ioctl(bdev, argp);
600
601 /* Compat mode returns 32-bit data instead of 'long' */
602 case BLKRAGET:
603 case BLKFRAGET:
604 if (!argp)
605 return -EINVAL;
606 return put_long(argp,
607 (bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512);
608 case BLKGETSIZE:
609 if (bdev_nr_sectors(bdev) > ~0UL)
610 return -EFBIG;
611 return put_ulong(argp, bdev_nr_sectors(bdev));
612
613 /* The data is compatible, but the command number is different */
614 case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
615 return put_int(argp, block_size(bdev));
616 case BLKBSZSET:
617 return blkdev_bszset(bdev, mode, argp);
618 case BLKGETSIZE64:
619 return put_u64(argp, bdev_nr_bytes(bdev));
620
621 /* Incompatible alignment on i386 */
622 case BLKTRACESETUP:
623 return blk_trace_ioctl(bdev, cmd, argp);
624 default:
625 break;
626 }
627
628 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
629 if (ret != -ENOIOCTLCMD)
630 return ret;
631
632 if (!bdev->bd_disk->fops->ioctl)
633 return -ENOTTY;
634 return bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg);
635 }
636
637 #ifdef CONFIG_COMPAT
638
639 #define BLKBSZGET_32 _IOR(0x12, 112, int)
640 #define BLKBSZSET_32 _IOW(0x12, 113, int)
641 #define BLKGETSIZE64_32 _IOR(0x12, 114, int)
642
643 /* Most of the generic ioctls are handled in the normal fallback path.
644 This assumes the blkdev's low level compat_ioctl always returns
645 ENOIOCTLCMD for unknown ioctls. */
compat_blkdev_ioctl(struct file * file,unsigned cmd,unsigned long arg)646 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
647 {
648 int ret;
649 void __user *argp = compat_ptr(arg);
650 struct block_device *bdev = I_BDEV(file->f_mapping->host);
651 struct gendisk *disk = bdev->bd_disk;
652 blk_mode_t mode = file_to_blk_mode(file);
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_disk->bdi->ra_pages * PAGE_SIZE) / 512);
668 case BLKGETSIZE:
669 if (bdev_nr_sectors(bdev) > ~(compat_ulong_t)0)
670 return -EFBIG;
671 return compat_put_ulong(argp, bdev_nr_sectors(bdev));
672
673 /* The data is compatible, but the command number is different */
674 case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
675 return put_int(argp, bdev_logical_block_size(bdev));
676 case BLKBSZSET_32:
677 return blkdev_bszset(bdev, mode, argp);
678 case BLKGETSIZE64_32:
679 return put_u64(argp, bdev_nr_bytes(bdev));
680
681 /* Incompatible alignment on i386 */
682 case BLKTRACESETUP32:
683 return blk_trace_ioctl(bdev, cmd, argp);
684 default:
685 break;
686 }
687
688 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
689 if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
690 ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
691
692 return ret;
693 }
694 #endif
695