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 || 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
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, 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, end - 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
blk_ioctl_secure_erase(struct block_device * bdev,blk_mode_t mode,void __user * argp)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, end;
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 (check_add_overflow(start, len, &end) ||
146 end > bdev_nr_bytes(bdev))
147 return -EINVAL;
148
149 filemap_invalidate_lock(bdev->bd_inode->i_mapping);
150 err = truncate_bdev_range(bdev, mode, start, end - 1);
151 if (!err)
152 err = blkdev_issue_secure_erase(bdev, start >> 9, len >> 9,
153 GFP_KERNEL);
154 filemap_invalidate_unlock(bdev->bd_inode->i_mapping);
155 return err;
156 }
157
158
blk_ioctl_zeroout(struct block_device * bdev,blk_mode_t mode,unsigned long arg)159 static int blk_ioctl_zeroout(struct block_device *bdev, blk_mode_t mode,
160 unsigned long arg)
161 {
162 uint64_t range[2];
163 uint64_t start, end, len;
164 struct inode *inode = bdev->bd_inode;
165 int err;
166
167 if (!(mode & BLK_OPEN_WRITE))
168 return -EBADF;
169
170 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
171 return -EFAULT;
172
173 start = range[0];
174 len = range[1];
175 end = start + len - 1;
176
177 if (start & 511)
178 return -EINVAL;
179 if (len & 511)
180 return -EINVAL;
181 if (end >= (uint64_t)bdev_nr_bytes(bdev))
182 return -EINVAL;
183 if (end < start)
184 return -EINVAL;
185
186 /* Invalidate the page cache, including dirty pages */
187 filemap_invalidate_lock(inode->i_mapping);
188 err = truncate_bdev_range(bdev, mode, start, end);
189 if (err)
190 goto fail;
191
192 err = blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL,
193 BLKDEV_ZERO_NOUNMAP);
194
195 fail:
196 filemap_invalidate_unlock(inode->i_mapping);
197 return err;
198 }
199
put_ushort(unsigned short __user * argp,unsigned short val)200 static int put_ushort(unsigned short __user *argp, unsigned short val)
201 {
202 return put_user(val, argp);
203 }
204
put_int(int __user * argp,int val)205 static int put_int(int __user *argp, int val)
206 {
207 return put_user(val, argp);
208 }
209
put_uint(unsigned int __user * argp,unsigned int val)210 static int put_uint(unsigned int __user *argp, unsigned int val)
211 {
212 return put_user(val, argp);
213 }
214
put_long(long __user * argp,long val)215 static int put_long(long __user *argp, long val)
216 {
217 return put_user(val, argp);
218 }
219
put_ulong(unsigned long __user * argp,unsigned long val)220 static int put_ulong(unsigned long __user *argp, unsigned long val)
221 {
222 return put_user(val, argp);
223 }
224
put_u64(u64 __user * argp,u64 val)225 static int put_u64(u64 __user *argp, u64 val)
226 {
227 return put_user(val, argp);
228 }
229
230 #ifdef CONFIG_COMPAT
compat_put_long(compat_long_t __user * argp,long val)231 static int compat_put_long(compat_long_t __user *argp, long val)
232 {
233 return put_user(val, argp);
234 }
235
compat_put_ulong(compat_ulong_t __user * argp,compat_ulong_t val)236 static int compat_put_ulong(compat_ulong_t __user *argp, compat_ulong_t val)
237 {
238 return put_user(val, argp);
239 }
240 #endif
241
242 #ifdef CONFIG_COMPAT
243 /*
244 * This is the equivalent of compat_ptr_ioctl(), to be used by block
245 * drivers that implement only commands that are completely compatible
246 * between 32-bit and 64-bit user space
247 */
blkdev_compat_ptr_ioctl(struct block_device * bdev,blk_mode_t mode,unsigned cmd,unsigned long arg)248 int blkdev_compat_ptr_ioctl(struct block_device *bdev, blk_mode_t mode,
249 unsigned cmd, unsigned long arg)
250 {
251 struct gendisk *disk = bdev->bd_disk;
252
253 if (disk->fops->ioctl)
254 return disk->fops->ioctl(bdev, mode, cmd,
255 (unsigned long)compat_ptr(arg));
256
257 return -ENOIOCTLCMD;
258 }
259 EXPORT_SYMBOL(blkdev_compat_ptr_ioctl);
260 #endif
261
blkdev_pr_allowed(struct block_device * bdev,blk_mode_t mode)262 static bool blkdev_pr_allowed(struct block_device *bdev, blk_mode_t mode)
263 {
264 /* no sense to make reservations for partitions */
265 if (bdev_is_partition(bdev))
266 return false;
267
268 if (capable(CAP_SYS_ADMIN))
269 return true;
270 /*
271 * Only allow unprivileged reservations if the file descriptor is open
272 * for writing.
273 */
274 return mode & BLK_OPEN_WRITE;
275 }
276
blkdev_pr_register(struct block_device * bdev,blk_mode_t mode,struct pr_registration __user * arg)277 static int blkdev_pr_register(struct block_device *bdev, blk_mode_t mode,
278 struct pr_registration __user *arg)
279 {
280 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
281 struct pr_registration reg;
282
283 if (!blkdev_pr_allowed(bdev, mode))
284 return -EPERM;
285 if (!ops || !ops->pr_register)
286 return -EOPNOTSUPP;
287 if (copy_from_user(®, arg, sizeof(reg)))
288 return -EFAULT;
289
290 if (reg.flags & ~PR_FL_IGNORE_KEY)
291 return -EOPNOTSUPP;
292 return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags);
293 }
294
blkdev_pr_reserve(struct block_device * bdev,blk_mode_t mode,struct pr_reservation __user * arg)295 static int blkdev_pr_reserve(struct block_device *bdev, blk_mode_t mode,
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 (!blkdev_pr_allowed(bdev, mode))
302 return -EPERM;
303 if (!ops || !ops->pr_reserve)
304 return -EOPNOTSUPP;
305 if (copy_from_user(&rsv, arg, sizeof(rsv)))
306 return -EFAULT;
307
308 if (rsv.flags & ~PR_FL_IGNORE_KEY)
309 return -EOPNOTSUPP;
310 return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags);
311 }
312
blkdev_pr_release(struct block_device * bdev,blk_mode_t mode,struct pr_reservation __user * arg)313 static int blkdev_pr_release(struct block_device *bdev, blk_mode_t mode,
314 struct pr_reservation __user *arg)
315 {
316 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
317 struct pr_reservation rsv;
318
319 if (!blkdev_pr_allowed(bdev, mode))
320 return -EPERM;
321 if (!ops || !ops->pr_release)
322 return -EOPNOTSUPP;
323 if (copy_from_user(&rsv, arg, sizeof(rsv)))
324 return -EFAULT;
325
326 if (rsv.flags)
327 return -EOPNOTSUPP;
328 return ops->pr_release(bdev, rsv.key, rsv.type);
329 }
330
blkdev_pr_preempt(struct block_device * bdev,blk_mode_t mode,struct pr_preempt __user * arg,bool abort)331 static int blkdev_pr_preempt(struct block_device *bdev, blk_mode_t mode,
332 struct pr_preempt __user *arg, bool abort)
333 {
334 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
335 struct pr_preempt p;
336
337 if (!blkdev_pr_allowed(bdev, mode))
338 return -EPERM;
339 if (!ops || !ops->pr_preempt)
340 return -EOPNOTSUPP;
341 if (copy_from_user(&p, arg, sizeof(p)))
342 return -EFAULT;
343
344 if (p.flags)
345 return -EOPNOTSUPP;
346 return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort);
347 }
348
blkdev_pr_clear(struct block_device * bdev,blk_mode_t mode,struct pr_clear __user * arg)349 static int blkdev_pr_clear(struct block_device *bdev, blk_mode_t mode,
350 struct pr_clear __user *arg)
351 {
352 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
353 struct pr_clear c;
354
355 if (!blkdev_pr_allowed(bdev, mode))
356 return -EPERM;
357 if (!ops || !ops->pr_clear)
358 return -EOPNOTSUPP;
359 if (copy_from_user(&c, arg, sizeof(c)))
360 return -EFAULT;
361
362 if (c.flags)
363 return -EOPNOTSUPP;
364 return ops->pr_clear(bdev, c.key);
365 }
366
blkdev_flushbuf(struct block_device * bdev,unsigned cmd,unsigned long arg)367 static int blkdev_flushbuf(struct block_device *bdev, unsigned cmd,
368 unsigned long arg)
369 {
370 if (!capable(CAP_SYS_ADMIN))
371 return -EACCES;
372
373 mutex_lock(&bdev->bd_holder_lock);
374 if (bdev->bd_holder_ops && bdev->bd_holder_ops->sync)
375 bdev->bd_holder_ops->sync(bdev);
376 else
377 sync_blockdev(bdev);
378 mutex_unlock(&bdev->bd_holder_lock);
379
380 invalidate_bdev(bdev);
381 return 0;
382 }
383
blkdev_roset(struct block_device * bdev,unsigned cmd,unsigned long arg)384 static int blkdev_roset(struct block_device *bdev, unsigned cmd,
385 unsigned long arg)
386 {
387 int ret, n;
388
389 if (!capable(CAP_SYS_ADMIN))
390 return -EACCES;
391
392 if (get_user(n, (int __user *)arg))
393 return -EFAULT;
394 if (bdev->bd_disk->fops->set_read_only) {
395 ret = bdev->bd_disk->fops->set_read_only(bdev, n);
396 if (ret)
397 return ret;
398 }
399 bdev->bd_read_only = n;
400 return 0;
401 }
402
blkdev_getgeo(struct block_device * bdev,struct hd_geometry __user * argp)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
compat_hdio_getgeo(struct block_device * bdev,struct compat_hd_geometry __user * ugeo)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 */
blkdev_bszset(struct block_device * bdev,blk_mode_t mode,int __user * argp)469 static int blkdev_bszset(struct block_device *bdev, blk_mode_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 & BLK_OPEN_EXCL)
482 return set_blocksize(bdev, n);
483
484 if (IS_ERR(blkdev_get_by_dev(bdev->bd_dev, mode, &bdev, NULL)))
485 return -EBUSY;
486 ret = set_blocksize(bdev, n);
487 blkdev_put(bdev, &bdev);
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 */
blkdev_common_ioctl(struct block_device * bdev,blk_mode_t mode,unsigned int cmd,unsigned long arg,void __user * argp)497 static int blkdev_common_ioctl(struct block_device *bdev, blk_mode_t mode,
498 unsigned int cmd, unsigned long arg,
499 void __user *argp)
500 {
501 unsigned int max_sectors;
502
503 switch (cmd) {
504 case BLKFLSBUF:
505 return blkdev_flushbuf(bdev, cmd, arg);
506 case BLKROSET:
507 return blkdev_roset(bdev, cmd, arg);
508 case BLKDISCARD:
509 return blk_ioctl_discard(bdev, mode, arg);
510 case BLKSECDISCARD:
511 return blk_ioctl_secure_erase(bdev, mode, argp);
512 case BLKZEROOUT:
513 return blk_ioctl_zeroout(bdev, mode, arg);
514 case BLKGETDISKSEQ:
515 return put_u64(argp, bdev->bd_disk->diskseq);
516 case BLKREPORTZONE:
517 return blkdev_report_zones_ioctl(bdev, cmd, arg);
518 case BLKRESETZONE:
519 case BLKOPENZONE:
520 case BLKCLOSEZONE:
521 case BLKFINISHZONE:
522 return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg);
523 case BLKGETZONESZ:
524 return put_uint(argp, bdev_zone_sectors(bdev));
525 case BLKGETNRZONES:
526 return put_uint(argp, bdev_nr_zones(bdev));
527 case BLKROGET:
528 return put_int(argp, bdev_read_only(bdev) != 0);
529 case BLKSSZGET: /* get block device logical block size */
530 return put_int(argp, bdev_logical_block_size(bdev));
531 case BLKPBSZGET: /* get block device physical block size */
532 return put_uint(argp, bdev_physical_block_size(bdev));
533 case BLKIOMIN:
534 return put_uint(argp, bdev_io_min(bdev));
535 case BLKIOOPT:
536 return put_uint(argp, bdev_io_opt(bdev));
537 case BLKALIGNOFF:
538 return put_int(argp, bdev_alignment_offset(bdev));
539 case BLKDISCARDZEROES:
540 return put_uint(argp, 0);
541 case BLKSECTGET:
542 max_sectors = min_t(unsigned int, USHRT_MAX,
543 queue_max_sectors(bdev_get_queue(bdev)));
544 return put_ushort(argp, max_sectors);
545 case BLKROTATIONAL:
546 return put_ushort(argp, !bdev_nonrot(bdev));
547 case BLKRASET:
548 case BLKFRASET:
549 if(!capable(CAP_SYS_ADMIN))
550 return -EACCES;
551 bdev->bd_disk->bdi->ra_pages = (arg * 512) / PAGE_SIZE;
552 return 0;
553 case BLKRRPART:
554 if (!capable(CAP_SYS_ADMIN))
555 return -EACCES;
556 if (bdev_is_partition(bdev))
557 return -EINVAL;
558 return disk_scan_partitions(bdev->bd_disk, mode);
559 case BLKTRACESTART:
560 case BLKTRACESTOP:
561 case BLKTRACETEARDOWN:
562 return blk_trace_ioctl(bdev, cmd, argp);
563 case IOC_PR_REGISTER:
564 return blkdev_pr_register(bdev, mode, argp);
565 case IOC_PR_RESERVE:
566 return blkdev_pr_reserve(bdev, mode, argp);
567 case IOC_PR_RELEASE:
568 return blkdev_pr_release(bdev, mode, argp);
569 case IOC_PR_PREEMPT:
570 return blkdev_pr_preempt(bdev, mode, argp, false);
571 case IOC_PR_PREEMPT_ABORT:
572 return blkdev_pr_preempt(bdev, mode, argp, true);
573 case IOC_PR_CLEAR:
574 return blkdev_pr_clear(bdev, mode, argp);
575 default:
576 return -ENOIOCTLCMD;
577 }
578 }
579
580 /*
581 * Always keep this in sync with compat_blkdev_ioctl()
582 * to handle all incompatible commands in both functions.
583 *
584 * New commands must be compatible and go into blkdev_common_ioctl
585 */
blkdev_ioctl(struct file * file,unsigned cmd,unsigned long arg)586 long blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
587 {
588 struct block_device *bdev = I_BDEV(file->f_mapping->host);
589 void __user *argp = (void __user *)arg;
590 blk_mode_t mode = file_to_blk_mode(file);
591 int ret;
592
593 switch (cmd) {
594 /* These need separate implementations for the data structure */
595 case HDIO_GETGEO:
596 return blkdev_getgeo(bdev, argp);
597 case BLKPG:
598 return blkpg_ioctl(bdev, argp);
599
600 /* Compat mode returns 32-bit data instead of 'long' */
601 case BLKRAGET:
602 case BLKFRAGET:
603 if (!argp)
604 return -EINVAL;
605 return put_long(argp,
606 (bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512);
607 case BLKGETSIZE:
608 if (bdev_nr_sectors(bdev) > ~0UL)
609 return -EFBIG;
610 return put_ulong(argp, bdev_nr_sectors(bdev));
611
612 /* The data is compatible, but the command number is different */
613 case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
614 return put_int(argp, block_size(bdev));
615 case BLKBSZSET:
616 return blkdev_bszset(bdev, mode, argp);
617 case BLKGETSIZE64:
618 return put_u64(argp, bdev_nr_bytes(bdev));
619
620 /* Incompatible alignment on i386 */
621 case BLKTRACESETUP:
622 return blk_trace_ioctl(bdev, cmd, argp);
623 default:
624 break;
625 }
626
627 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
628 if (ret != -ENOIOCTLCMD)
629 return ret;
630
631 if (!bdev->bd_disk->fops->ioctl)
632 return -ENOTTY;
633 return bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg);
634 }
635
636 #ifdef CONFIG_COMPAT
637
638 #define BLKBSZGET_32 _IOR(0x12, 112, int)
639 #define BLKBSZSET_32 _IOW(0x12, 113, int)
640 #define BLKGETSIZE64_32 _IOR(0x12, 114, int)
641
642 /* Most of the generic ioctls are handled in the normal fallback path.
643 This assumes the blkdev's low level compat_ioctl always returns
644 ENOIOCTLCMD for unknown ioctls. */
compat_blkdev_ioctl(struct file * file,unsigned cmd,unsigned long arg)645 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
646 {
647 int ret;
648 void __user *argp = compat_ptr(arg);
649 struct block_device *bdev = I_BDEV(file->f_mapping->host);
650 struct gendisk *disk = bdev->bd_disk;
651 blk_mode_t mode = file_to_blk_mode(file);
652
653 switch (cmd) {
654 /* These need separate implementations for the data structure */
655 case HDIO_GETGEO:
656 return compat_hdio_getgeo(bdev, argp);
657 case BLKPG:
658 return compat_blkpg_ioctl(bdev, argp);
659
660 /* Compat mode returns 32-bit data instead of 'long' */
661 case BLKRAGET:
662 case BLKFRAGET:
663 if (!argp)
664 return -EINVAL;
665 return compat_put_long(argp,
666 (bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512);
667 case BLKGETSIZE:
668 if (bdev_nr_sectors(bdev) > ~(compat_ulong_t)0)
669 return -EFBIG;
670 return compat_put_ulong(argp, bdev_nr_sectors(bdev));
671
672 /* The data is compatible, but the command number is different */
673 case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
674 return put_int(argp, bdev_logical_block_size(bdev));
675 case BLKBSZSET_32:
676 return blkdev_bszset(bdev, mode, argp);
677 case BLKGETSIZE64_32:
678 return put_u64(argp, bdev_nr_bytes(bdev));
679
680 /* Incompatible alignment on i386 */
681 case BLKTRACESETUP32:
682 return blk_trace_ioctl(bdev, cmd, argp);
683 default:
684 break;
685 }
686
687 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
688 if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
689 ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
690
691 return ret;
692 }
693 #endif
694