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 | long long start, length; |
22 | |
23 | if (disk->flags & GENHD_FL_NO_PART) |
24 | return -EINVAL; |
25 | if (!capable(CAP_SYS_ADMIN)) |
26 | return -EACCES; |
27 | if (copy_from_user(to: &p, from: upart, n: sizeof(struct blkpg_partition))) |
28 | return -EFAULT; |
29 | if (bdev_is_partition(bdev)) |
30 | return -EINVAL; |
31 | |
32 | if (p.pno <= 0) |
33 | return -EINVAL; |
34 | |
35 | if (op == BLKPG_DEL_PARTITION) |
36 | return bdev_del_partition(disk, partno: p.pno); |
37 | |
38 | start = p.start >> SECTOR_SHIFT; |
39 | length = p.length >> SECTOR_SHIFT; |
40 | |
41 | switch (op) { |
42 | case BLKPG_ADD_PARTITION: |
43 | /* check if partition is aligned to blocksize */ |
44 | if (p.start & (bdev_logical_block_size(bdev) - 1)) |
45 | return -EINVAL; |
46 | return bdev_add_partition(disk, partno: p.pno, start, length); |
47 | case BLKPG_RESIZE_PARTITION: |
48 | return bdev_resize_partition(disk, partno: p.pno, start, length); |
49 | default: |
50 | return -EINVAL; |
51 | } |
52 | } |
53 | |
54 | static int blkpg_ioctl(struct block_device *bdev, |
55 | struct blkpg_ioctl_arg __user *arg) |
56 | { |
57 | struct blkpg_partition __user *udata; |
58 | int op; |
59 | |
60 | if (get_user(op, &arg->op) || get_user(udata, &arg->data)) |
61 | return -EFAULT; |
62 | |
63 | return blkpg_do_ioctl(bdev, upart: udata, op); |
64 | } |
65 | |
66 | #ifdef CONFIG_COMPAT |
67 | struct compat_blkpg_ioctl_arg { |
68 | compat_int_t op; |
69 | compat_int_t flags; |
70 | compat_int_t datalen; |
71 | compat_caddr_t data; |
72 | }; |
73 | |
74 | static int compat_blkpg_ioctl(struct block_device *bdev, |
75 | struct compat_blkpg_ioctl_arg __user *arg) |
76 | { |
77 | compat_caddr_t udata; |
78 | int op; |
79 | |
80 | if (get_user(op, &arg->op) || get_user(udata, &arg->data)) |
81 | return -EFAULT; |
82 | |
83 | return blkpg_do_ioctl(bdev, upart: compat_ptr(uptr: udata), op); |
84 | } |
85 | #endif |
86 | |
87 | static int blk_ioctl_discard(struct block_device *bdev, blk_mode_t mode, |
88 | unsigned long arg) |
89 | { |
90 | uint64_t range[2]; |
91 | uint64_t start, len; |
92 | struct inode *inode = bdev->bd_inode; |
93 | int err; |
94 | |
95 | if (!(mode & BLK_OPEN_WRITE)) |
96 | return -EBADF; |
97 | |
98 | if (!bdev_max_discard_sectors(bdev)) |
99 | return -EOPNOTSUPP; |
100 | |
101 | if (copy_from_user(to: range, from: (void __user *)arg, n: sizeof(range))) |
102 | return -EFAULT; |
103 | |
104 | start = range[0]; |
105 | len = range[1]; |
106 | |
107 | if (start & 511) |
108 | return -EINVAL; |
109 | if (len & 511) |
110 | return -EINVAL; |
111 | |
112 | if (start + len > bdev_nr_bytes(bdev)) |
113 | return -EINVAL; |
114 | |
115 | filemap_invalidate_lock(mapping: inode->i_mapping); |
116 | err = truncate_bdev_range(bdev, mode, lstart: start, lend: start + len - 1); |
117 | if (err) |
118 | goto fail; |
119 | err = blkdev_issue_discard(bdev, sector: start >> 9, nr_sects: len >> 9, GFP_KERNEL); |
120 | fail: |
121 | filemap_invalidate_unlock(mapping: inode->i_mapping); |
122 | return err; |
123 | } |
124 | |
125 | static int blk_ioctl_secure_erase(struct block_device *bdev, blk_mode_t mode, |
126 | void __user *argp) |
127 | { |
128 | uint64_t start, len; |
129 | uint64_t range[2]; |
130 | int err; |
131 | |
132 | if (!(mode & BLK_OPEN_WRITE)) |
133 | return -EBADF; |
134 | if (!bdev_max_secure_erase_sectors(bdev)) |
135 | return -EOPNOTSUPP; |
136 | if (copy_from_user(to: range, from: argp, n: sizeof(range))) |
137 | return -EFAULT; |
138 | |
139 | start = range[0]; |
140 | len = range[1]; |
141 | if ((start & 511) || (len & 511)) |
142 | return -EINVAL; |
143 | if (start + len > bdev_nr_bytes(bdev)) |
144 | return -EINVAL; |
145 | |
146 | filemap_invalidate_lock(mapping: bdev->bd_inode->i_mapping); |
147 | err = truncate_bdev_range(bdev, mode, lstart: start, lend: start + len - 1); |
148 | if (!err) |
149 | err = blkdev_issue_secure_erase(bdev, sector: start >> 9, nr_sects: len >> 9, |
150 | GFP_KERNEL); |
151 | filemap_invalidate_unlock(mapping: bdev->bd_inode->i_mapping); |
152 | return err; |
153 | } |
154 | |
155 | |
156 | static int blk_ioctl_zeroout(struct block_device *bdev, blk_mode_t mode, |
157 | unsigned long arg) |
158 | { |
159 | uint64_t range[2]; |
160 | uint64_t start, end, len; |
161 | struct inode *inode = bdev->bd_inode; |
162 | int err; |
163 | |
164 | if (!(mode & BLK_OPEN_WRITE)) |
165 | return -EBADF; |
166 | |
167 | if (copy_from_user(to: range, from: (void __user *)arg, n: sizeof(range))) |
168 | return -EFAULT; |
169 | |
170 | start = range[0]; |
171 | len = range[1]; |
172 | end = start + len - 1; |
173 | |
174 | if (start & 511) |
175 | return -EINVAL; |
176 | if (len & 511) |
177 | return -EINVAL; |
178 | if (end >= (uint64_t)bdev_nr_bytes(bdev)) |
179 | return -EINVAL; |
180 | if (end < start) |
181 | return -EINVAL; |
182 | |
183 | /* Invalidate the page cache, including dirty pages */ |
184 | filemap_invalidate_lock(mapping: inode->i_mapping); |
185 | err = truncate_bdev_range(bdev, mode, lstart: start, lend: end); |
186 | if (err) |
187 | goto fail; |
188 | |
189 | err = blkdev_issue_zeroout(bdev, sector: start >> 9, nr_sects: len >> 9, GFP_KERNEL, |
190 | BLKDEV_ZERO_NOUNMAP); |
191 | |
192 | fail: |
193 | filemap_invalidate_unlock(mapping: inode->i_mapping); |
194 | return err; |
195 | } |
196 | |
197 | static int put_ushort(unsigned short __user *argp, unsigned short val) |
198 | { |
199 | return put_user(val, argp); |
200 | } |
201 | |
202 | static int put_int(int __user *argp, int val) |
203 | { |
204 | return put_user(val, argp); |
205 | } |
206 | |
207 | static int put_uint(unsigned int __user *argp, unsigned int val) |
208 | { |
209 | return put_user(val, argp); |
210 | } |
211 | |
212 | static int put_long(long __user *argp, long val) |
213 | { |
214 | return put_user(val, argp); |
215 | } |
216 | |
217 | static int put_ulong(unsigned long __user *argp, unsigned long val) |
218 | { |
219 | return put_user(val, argp); |
220 | } |
221 | |
222 | static int put_u64(u64 __user *argp, u64 val) |
223 | { |
224 | return put_user(val, argp); |
225 | } |
226 | |
227 | #ifdef CONFIG_COMPAT |
228 | static int compat_put_long(compat_long_t __user *argp, long val) |
229 | { |
230 | return put_user(val, argp); |
231 | } |
232 | |
233 | static int compat_put_ulong(compat_ulong_t __user *argp, compat_ulong_t val) |
234 | { |
235 | return put_user(val, argp); |
236 | } |
237 | #endif |
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, blk_mode_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(uptr: arg)); |
253 | |
254 | return -ENOIOCTLCMD; |
255 | } |
256 | EXPORT_SYMBOL(blkdev_compat_ptr_ioctl); |
257 | #endif |
258 | |
259 | static bool blkdev_pr_allowed(struct block_device *bdev, blk_mode_t mode) |
260 | { |
261 | /* no sense to make reservations for partitions */ |
262 | if (bdev_is_partition(bdev)) |
263 | return false; |
264 | |
265 | if (capable(CAP_SYS_ADMIN)) |
266 | return true; |
267 | /* |
268 | * Only allow unprivileged reservations if the file descriptor is open |
269 | * for writing. |
270 | */ |
271 | return mode & BLK_OPEN_WRITE; |
272 | } |
273 | |
274 | static int blkdev_pr_register(struct block_device *bdev, blk_mode_t mode, |
275 | struct pr_registration __user *arg) |
276 | { |
277 | const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; |
278 | struct pr_registration reg; |
279 | |
280 | if (!blkdev_pr_allowed(bdev, mode)) |
281 | return -EPERM; |
282 | if (!ops || !ops->pr_register) |
283 | return -EOPNOTSUPP; |
284 | if (copy_from_user(to: ®, from: arg, n: sizeof(reg))) |
285 | return -EFAULT; |
286 | |
287 | if (reg.flags & ~PR_FL_IGNORE_KEY) |
288 | return -EOPNOTSUPP; |
289 | return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags); |
290 | } |
291 | |
292 | static int blkdev_pr_reserve(struct block_device *bdev, blk_mode_t mode, |
293 | struct pr_reservation __user *arg) |
294 | { |
295 | const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; |
296 | struct pr_reservation rsv; |
297 | |
298 | if (!blkdev_pr_allowed(bdev, mode)) |
299 | return -EPERM; |
300 | if (!ops || !ops->pr_reserve) |
301 | return -EOPNOTSUPP; |
302 | if (copy_from_user(to: &rsv, from: arg, n: sizeof(rsv))) |
303 | return -EFAULT; |
304 | |
305 | if (rsv.flags & ~PR_FL_IGNORE_KEY) |
306 | return -EOPNOTSUPP; |
307 | return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags); |
308 | } |
309 | |
310 | static int blkdev_pr_release(struct block_device *bdev, blk_mode_t mode, |
311 | struct pr_reservation __user *arg) |
312 | { |
313 | const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; |
314 | struct pr_reservation rsv; |
315 | |
316 | if (!blkdev_pr_allowed(bdev, mode)) |
317 | return -EPERM; |
318 | if (!ops || !ops->pr_release) |
319 | return -EOPNOTSUPP; |
320 | if (copy_from_user(to: &rsv, from: arg, n: sizeof(rsv))) |
321 | return -EFAULT; |
322 | |
323 | if (rsv.flags) |
324 | return -EOPNOTSUPP; |
325 | return ops->pr_release(bdev, rsv.key, rsv.type); |
326 | } |
327 | |
328 | static int blkdev_pr_preempt(struct block_device *bdev, blk_mode_t mode, |
329 | struct pr_preempt __user *arg, bool abort) |
330 | { |
331 | const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; |
332 | struct pr_preempt p; |
333 | |
334 | if (!blkdev_pr_allowed(bdev, mode)) |
335 | return -EPERM; |
336 | if (!ops || !ops->pr_preempt) |
337 | return -EOPNOTSUPP; |
338 | if (copy_from_user(to: &p, from: arg, n: sizeof(p))) |
339 | return -EFAULT; |
340 | |
341 | if (p.flags) |
342 | return -EOPNOTSUPP; |
343 | return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort); |
344 | } |
345 | |
346 | static int blkdev_pr_clear(struct block_device *bdev, blk_mode_t mode, |
347 | struct pr_clear __user *arg) |
348 | { |
349 | const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; |
350 | struct pr_clear c; |
351 | |
352 | if (!blkdev_pr_allowed(bdev, mode)) |
353 | return -EPERM; |
354 | if (!ops || !ops->pr_clear) |
355 | return -EOPNOTSUPP; |
356 | if (copy_from_user(to: &c, from: arg, n: sizeof(c))) |
357 | return -EFAULT; |
358 | |
359 | if (c.flags) |
360 | return -EOPNOTSUPP; |
361 | return ops->pr_clear(bdev, c.key); |
362 | } |
363 | |
364 | static int blkdev_flushbuf(struct block_device *bdev, unsigned cmd, |
365 | unsigned long arg) |
366 | { |
367 | if (!capable(CAP_SYS_ADMIN)) |
368 | return -EACCES; |
369 | |
370 | mutex_lock(&bdev->bd_holder_lock); |
371 | if (bdev->bd_holder_ops && bdev->bd_holder_ops->sync) |
372 | bdev->bd_holder_ops->sync(bdev); |
373 | else { |
374 | mutex_unlock(lock: &bdev->bd_holder_lock); |
375 | sync_blockdev(bdev); |
376 | } |
377 | |
378 | invalidate_bdev(bdev); |
379 | return 0; |
380 | } |
381 | |
382 | static int blkdev_roset(struct block_device *bdev, unsigned cmd, |
383 | unsigned long arg) |
384 | { |
385 | int ret, n; |
386 | |
387 | if (!capable(CAP_SYS_ADMIN)) |
388 | return -EACCES; |
389 | |
390 | if (get_user(n, (int __user *)arg)) |
391 | return -EFAULT; |
392 | if (bdev->bd_disk->fops->set_read_only) { |
393 | ret = bdev->bd_disk->fops->set_read_only(bdev, n); |
394 | if (ret) |
395 | return ret; |
396 | } |
397 | bdev->bd_read_only = n; |
398 | return 0; |
399 | } |
400 | |
401 | static int blkdev_getgeo(struct block_device *bdev, |
402 | struct hd_geometry __user *argp) |
403 | { |
404 | struct gendisk *disk = bdev->bd_disk; |
405 | struct hd_geometry geo; |
406 | int ret; |
407 | |
408 | if (!argp) |
409 | return -EINVAL; |
410 | if (!disk->fops->getgeo) |
411 | return -ENOTTY; |
412 | |
413 | /* |
414 | * We need to set the startsect first, the driver may |
415 | * want to override it. |
416 | */ |
417 | memset(&geo, 0, sizeof(geo)); |
418 | geo.start = get_start_sect(bdev); |
419 | ret = disk->fops->getgeo(bdev, &geo); |
420 | if (ret) |
421 | return ret; |
422 | if (copy_to_user(to: argp, from: &geo, n: sizeof(geo))) |
423 | return -EFAULT; |
424 | return 0; |
425 | } |
426 | |
427 | #ifdef CONFIG_COMPAT |
428 | struct compat_hd_geometry { |
429 | unsigned char heads; |
430 | unsigned char sectors; |
431 | unsigned short cylinders; |
432 | u32 start; |
433 | }; |
434 | |
435 | static int compat_hdio_getgeo(struct block_device *bdev, |
436 | struct compat_hd_geometry __user *ugeo) |
437 | { |
438 | struct gendisk *disk = bdev->bd_disk; |
439 | struct hd_geometry geo; |
440 | int ret; |
441 | |
442 | if (!ugeo) |
443 | return -EINVAL; |
444 | if (!disk->fops->getgeo) |
445 | return -ENOTTY; |
446 | |
447 | memset(&geo, 0, sizeof(geo)); |
448 | /* |
449 | * We need to set the startsect first, the driver may |
450 | * want to override it. |
451 | */ |
452 | geo.start = get_start_sect(bdev); |
453 | ret = disk->fops->getgeo(bdev, &geo); |
454 | if (ret) |
455 | return ret; |
456 | |
457 | ret = copy_to_user(to: ugeo, from: &geo, n: 4); |
458 | ret |= put_user(geo.start, &ugeo->start); |
459 | if (ret) |
460 | ret = -EFAULT; |
461 | |
462 | return ret; |
463 | } |
464 | #endif |
465 | |
466 | /* set the logical block size */ |
467 | static int blkdev_bszset(struct block_device *bdev, blk_mode_t mode, |
468 | int __user *argp) |
469 | { |
470 | int ret, n; |
471 | struct bdev_handle *handle; |
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, size: n); |
482 | |
483 | handle = bdev_open_by_dev(dev: bdev->bd_dev, mode, holder: &bdev, NULL); |
484 | if (IS_ERR(ptr: handle)) |
485 | return -EBUSY; |
486 | ret = set_blocksize(bdev, size: n); |
487 | bdev_release(handle); |
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, 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, val: 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, val: bdev_zone_sectors(bdev)); |
525 | case BLKGETNRZONES: |
526 | return put_uint(argp, val: bdev_nr_zones(bdev)); |
527 | case BLKROGET: |
528 | return put_int(argp, val: bdev_read_only(bdev) != 0); |
529 | case BLKSSZGET: /* get block device logical block size */ |
530 | return put_int(argp, val: bdev_logical_block_size(bdev)); |
531 | case BLKPBSZGET: /* get block device physical block size */ |
532 | return put_uint(argp, val: bdev_physical_block_size(bdev)); |
533 | case BLKIOMIN: |
534 | return put_uint(argp, val: bdev_io_min(bdev)); |
535 | case BLKIOOPT: |
536 | return put_uint(argp, val: bdev_io_opt(bdev)); |
537 | case BLKALIGNOFF: |
538 | return put_int(argp, val: bdev_alignment_offset(bdev)); |
539 | case BLKDISCARDZEROES: |
540 | return put_uint(argp, val: 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, val: max_sectors); |
545 | case BLKROTATIONAL: |
546 | return put_ushort(argp, val: !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(disk: 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, arg: argp); |
565 | case IOC_PR_RESERVE: |
566 | return blkdev_pr_reserve(bdev, mode, arg: argp); |
567 | case IOC_PR_RELEASE: |
568 | return blkdev_pr_release(bdev, mode, arg: argp); |
569 | case IOC_PR_PREEMPT: |
570 | return blkdev_pr_preempt(bdev, mode, arg: argp, abort: false); |
571 | case IOC_PR_PREEMPT_ABORT: |
572 | return blkdev_pr_preempt(bdev, mode, arg: argp, abort: true); |
573 | case IOC_PR_CLEAR: |
574 | return blkdev_pr_clear(bdev, mode, arg: 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 | */ |
586 | long blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg) |
587 | { |
588 | struct block_device *bdev = I_BDEV(inode: 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, arg: 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 | val: (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, val: 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, val: block_size(bdev)); |
615 | case BLKBSZSET: |
616 | return blkdev_bszset(bdev, mode, argp); |
617 | case BLKGETSIZE64: |
618 | return put_u64(argp, val: 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. */ |
645 | long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg) |
646 | { |
647 | int ret; |
648 | void __user *argp = compat_ptr(uptr: arg); |
649 | struct block_device *bdev = I_BDEV(inode: 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, ugeo: argp); |
657 | case BLKPG: |
658 | return compat_blkpg_ioctl(bdev, arg: 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 | val: (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, val: 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, val: 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, val: 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 | |