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3dcf60bc | 1 | // SPDX-License-Identifier: GPL-2.0 |
c59ede7b | 2 | #include <linux/capability.h> |
ee6a129d | 3 | #include <linux/compat.h> |
1da177e4 | 4 | #include <linux/blkdev.h> |
d5decd3b | 5 | #include <linux/export.h> |
5a0e3ad6 | 6 | #include <linux/gfp.h> |
1da177e4 | 7 | #include <linux/blkpg.h> |
a885c8c4 | 8 | #include <linux/hdreg.h> |
1da177e4 | 9 | #include <linux/backing-dev.h> |
ff01bb48 | 10 | #include <linux/fs.h> |
2056a782 | 11 | #include <linux/blktrace_api.h> |
bbd3e064 | 12 | #include <linux/pr.h> |
7c0f6ba6 | 13 | #include <linux/uaccess.h> |
1da177e4 LT |
14 | |
15 | static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user *arg) | |
16 | { | |
17 | struct block_device *bdevp; | |
18 | struct gendisk *disk; | |
c83f6bf9 | 19 | struct hd_struct *part, *lpart; |
1da177e4 LT |
20 | struct blkpg_ioctl_arg a; |
21 | struct blkpg_partition p; | |
e71bf0d0 | 22 | struct disk_part_iter piter; |
1da177e4 | 23 | long long start, length; |
cf771cb5 | 24 | int partno; |
1da177e4 LT |
25 | |
26 | if (!capable(CAP_SYS_ADMIN)) | |
27 | return -EACCES; | |
28 | if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg))) | |
29 | return -EFAULT; | |
30 | if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition))) | |
31 | return -EFAULT; | |
32 | disk = bdev->bd_disk; | |
33 | if (bdev != bdev->bd_contains) | |
34 | return -EINVAL; | |
cf771cb5 | 35 | partno = p.pno; |
540eed56 | 36 | if (partno <= 0) |
1da177e4 LT |
37 | return -EINVAL; |
38 | switch (a.op) { | |
39 | case BLKPG_ADD_PARTITION: | |
40 | start = p.start >> 9; | |
41 | length = p.length >> 9; | |
c83f6bf9 VG |
42 | /* check for fit in a hd_struct */ |
43 | if (sizeof(sector_t) == sizeof(long) && | |
1da177e4 LT |
44 | sizeof(long long) > sizeof(long)) { |
45 | long pstart = start, plength = length; | |
46 | if (pstart != start || plength != length | |
2bd6efad | 47 | || pstart < 0 || plength < 0 || partno > 65535) |
1da177e4 LT |
48 | return -EINVAL; |
49 | } | |
633395b6 SH |
50 | /* check if partition is aligned to blocksize */ |
51 | if (p.start & (bdev_logical_block_size(bdev) - 1)) | |
52 | return -EINVAL; | |
88e34126 | 53 | |
c039e313 | 54 | mutex_lock(&bdev->bd_mutex); |
88e34126 | 55 | |
1da177e4 | 56 | /* overlap? */ |
e71bf0d0 TH |
57 | disk_part_iter_init(&piter, disk, |
58 | DISK_PITER_INCL_EMPTY); | |
59 | while ((part = disk_part_iter_next(&piter))) { | |
60 | if (!(start + length <= part->start_sect || | |
61 | start >= part->start_sect + part->nr_sects)) { | |
62 | disk_part_iter_exit(&piter); | |
c039e313 | 63 | mutex_unlock(&bdev->bd_mutex); |
1da177e4 LT |
64 | return -EBUSY; |
65 | } | |
66 | } | |
e71bf0d0 TH |
67 | disk_part_iter_exit(&piter); |
68 | ||
1da177e4 | 69 | /* all seems OK */ |
ba32929a | 70 | part = add_partition(disk, partno, start, length, |
6d1d8050 | 71 | ADDPART_FLAG_NONE, NULL); |
c039e313 | 72 | mutex_unlock(&bdev->bd_mutex); |
c7d1ba41 | 73 | return PTR_ERR_OR_ZERO(part); |
1da177e4 | 74 | case BLKPG_DEL_PARTITION: |
e71bf0d0 TH |
75 | part = disk_get_part(disk, partno); |
76 | if (!part) | |
1da177e4 | 77 | return -ENXIO; |
e71bf0d0 TH |
78 | |
79 | bdevp = bdget(part_devt(part)); | |
80 | disk_put_part(part); | |
1da177e4 LT |
81 | if (!bdevp) |
82 | return -ENOMEM; | |
e71bf0d0 | 83 | |
2e7b651d | 84 | mutex_lock(&bdevp->bd_mutex); |
1da177e4 | 85 | if (bdevp->bd_openers) { |
c039e313 | 86 | mutex_unlock(&bdevp->bd_mutex); |
1da177e4 LT |
87 | bdput(bdevp); |
88 | return -EBUSY; | |
89 | } | |
90 | /* all seems OK */ | |
91 | fsync_bdev(bdevp); | |
f98393a6 | 92 | invalidate_bdev(bdevp); |
1da177e4 | 93 | |
6d740cd5 | 94 | mutex_lock_nested(&bdev->bd_mutex, 1); |
cf771cb5 | 95 | delete_partition(disk, partno); |
c039e313 AV |
96 | mutex_unlock(&bdev->bd_mutex); |
97 | mutex_unlock(&bdevp->bd_mutex); | |
1da177e4 LT |
98 | bdput(bdevp); |
99 | ||
c83f6bf9 VG |
100 | return 0; |
101 | case BLKPG_RESIZE_PARTITION: | |
102 | start = p.start >> 9; | |
103 | /* new length of partition in bytes */ | |
104 | length = p.length >> 9; | |
105 | /* check for fit in a hd_struct */ | |
106 | if (sizeof(sector_t) == sizeof(long) && | |
107 | sizeof(long long) > sizeof(long)) { | |
108 | long pstart = start, plength = length; | |
109 | if (pstart != start || plength != length | |
110 | || pstart < 0 || plength < 0) | |
111 | return -EINVAL; | |
112 | } | |
113 | part = disk_get_part(disk, partno); | |
114 | if (!part) | |
115 | return -ENXIO; | |
116 | bdevp = bdget(part_devt(part)); | |
117 | if (!bdevp) { | |
118 | disk_put_part(part); | |
119 | return -ENOMEM; | |
120 | } | |
121 | mutex_lock(&bdevp->bd_mutex); | |
122 | mutex_lock_nested(&bdev->bd_mutex, 1); | |
123 | if (start != part->start_sect) { | |
124 | mutex_unlock(&bdevp->bd_mutex); | |
125 | mutex_unlock(&bdev->bd_mutex); | |
126 | bdput(bdevp); | |
127 | disk_put_part(part); | |
128 | return -EINVAL; | |
129 | } | |
130 | /* overlap? */ | |
131 | disk_part_iter_init(&piter, disk, | |
132 | DISK_PITER_INCL_EMPTY); | |
133 | while ((lpart = disk_part_iter_next(&piter))) { | |
134 | if (lpart->partno != partno && | |
135 | !(start + length <= lpart->start_sect || | |
136 | start >= lpart->start_sect + lpart->nr_sects) | |
137 | ) { | |
138 | disk_part_iter_exit(&piter); | |
139 | mutex_unlock(&bdevp->bd_mutex); | |
140 | mutex_unlock(&bdev->bd_mutex); | |
141 | bdput(bdevp); | |
142 | disk_put_part(part); | |
143 | return -EBUSY; | |
144 | } | |
145 | } | |
146 | disk_part_iter_exit(&piter); | |
147 | part_nr_sects_write(part, (sector_t)length); | |
148 | i_size_write(bdevp->bd_inode, p.length); | |
149 | mutex_unlock(&bdevp->bd_mutex); | |
150 | mutex_unlock(&bdev->bd_mutex); | |
151 | bdput(bdevp); | |
152 | disk_put_part(part); | |
1da177e4 LT |
153 | return 0; |
154 | default: | |
155 | return -EINVAL; | |
156 | } | |
157 | } | |
158 | ||
f0b870df | 159 | static int blkdev_reread_part(struct block_device *bdev) |
1da177e4 | 160 | { |
f0b870df CH |
161 | int ret; |
162 | ||
142fe8f4 | 163 | if (!disk_part_scan_enabled(bdev->bd_disk) || bdev != bdev->bd_contains) |
1da177e4 LT |
164 | return -EINVAL; |
165 | if (!capable(CAP_SYS_ADMIN)) | |
166 | return -EACCES; | |
be324177 | 167 | |
b04a5636 | 168 | mutex_lock(&bdev->bd_mutex); |
f0b870df | 169 | ret = bdev_disk_changed(bdev, false); |
c039e313 | 170 | mutex_unlock(&bdev->bd_mutex); |
be324177 | 171 | |
f0b870df | 172 | return ret; |
1da177e4 LT |
173 | } |
174 | ||
d8e4bb81 CH |
175 | static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode, |
176 | unsigned long arg, unsigned long flags) | |
d30a2605 | 177 | { |
d8e4bb81 CH |
178 | uint64_t range[2]; |
179 | uint64_t start, len; | |
351499a1 DM |
180 | struct request_queue *q = bdev_get_queue(bdev); |
181 | struct address_space *mapping = bdev->bd_inode->i_mapping; | |
182 | ||
d8e4bb81 CH |
183 | |
184 | if (!(mode & FMODE_WRITE)) | |
185 | return -EBADF; | |
186 | ||
351499a1 DM |
187 | if (!blk_queue_discard(q)) |
188 | return -EOPNOTSUPP; | |
189 | ||
d8e4bb81 CH |
190 | if (copy_from_user(range, (void __user *)arg, sizeof(range))) |
191 | return -EFAULT; | |
192 | ||
193 | start = range[0]; | |
194 | len = range[1]; | |
8d57a98c | 195 | |
d30a2605 DW |
196 | if (start & 511) |
197 | return -EINVAL; | |
198 | if (len & 511) | |
199 | return -EINVAL; | |
d30a2605 | 200 | |
351499a1 | 201 | if (start + len > i_size_read(bdev->bd_inode)) |
d30a2605 | 202 | return -EINVAL; |
0bd1ed48 | 203 | truncate_inode_pages_range(mapping, start, start + len - 1); |
351499a1 DM |
204 | return blkdev_issue_discard(bdev, start >> 9, len >> 9, |
205 | GFP_KERNEL, flags); | |
d30a2605 DW |
206 | } |
207 | ||
d8e4bb81 CH |
208 | static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode, |
209 | unsigned long arg) | |
66ba32dc | 210 | { |
d8e4bb81 | 211 | uint64_t range[2]; |
22dd6d35 DW |
212 | struct address_space *mapping; |
213 | uint64_t start, end, len; | |
d8e4bb81 CH |
214 | |
215 | if (!(mode & FMODE_WRITE)) | |
216 | return -EBADF; | |
217 | ||
218 | if (copy_from_user(range, (void __user *)arg, sizeof(range))) | |
219 | return -EFAULT; | |
220 | ||
221 | start = range[0]; | |
222 | len = range[1]; | |
22dd6d35 | 223 | end = start + len - 1; |
d8e4bb81 | 224 | |
66ba32dc MP |
225 | if (start & 511) |
226 | return -EINVAL; | |
227 | if (len & 511) | |
228 | return -EINVAL; | |
22dd6d35 DW |
229 | if (end >= (uint64_t)i_size_read(bdev->bd_inode)) |
230 | return -EINVAL; | |
231 | if (end < start) | |
66ba32dc MP |
232 | return -EINVAL; |
233 | ||
22dd6d35 DW |
234 | /* Invalidate the page cache, including dirty pages */ |
235 | mapping = bdev->bd_inode->i_mapping; | |
236 | truncate_inode_pages_range(mapping, start, end); | |
237 | ||
238 | return blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL, | |
ee472d83 | 239 | BLKDEV_ZERO_NOUNMAP); |
66ba32dc MP |
240 | } |
241 | ||
1da177e4 LT |
242 | static int put_ushort(unsigned long arg, unsigned short val) |
243 | { | |
244 | return put_user(val, (unsigned short __user *)arg); | |
245 | } | |
246 | ||
247 | static int put_int(unsigned long arg, int val) | |
248 | { | |
249 | return put_user(val, (int __user *)arg); | |
250 | } | |
251 | ||
ac481c20 MP |
252 | static int put_uint(unsigned long arg, unsigned int val) |
253 | { | |
254 | return put_user(val, (unsigned int __user *)arg); | |
255 | } | |
256 | ||
1da177e4 LT |
257 | static int put_long(unsigned long arg, long val) |
258 | { | |
259 | return put_user(val, (long __user *)arg); | |
260 | } | |
261 | ||
262 | static int put_ulong(unsigned long arg, unsigned long val) | |
263 | { | |
264 | return put_user(val, (unsigned long __user *)arg); | |
265 | } | |
266 | ||
267 | static int put_u64(unsigned long arg, u64 val) | |
268 | { | |
269 | return put_user(val, (u64 __user *)arg); | |
270 | } | |
271 | ||
bdc1ddad AB |
272 | #ifdef CONFIG_COMPAT |
273 | static int compat_put_ushort(unsigned long arg, unsigned short val) | |
274 | { | |
275 | return put_user(val, (unsigned short __user *)compat_ptr(arg)); | |
276 | } | |
277 | ||
278 | static int compat_put_int(unsigned long arg, int val) | |
279 | { | |
280 | return put_user(val, (compat_int_t __user *)compat_ptr(arg)); | |
281 | } | |
282 | ||
283 | static int compat_put_uint(unsigned long arg, unsigned int val) | |
284 | { | |
285 | return put_user(val, (compat_uint_t __user *)compat_ptr(arg)); | |
286 | } | |
287 | ||
288 | static int compat_put_long(unsigned long arg, long val) | |
289 | { | |
290 | return put_user(val, (compat_long_t __user *)compat_ptr(arg)); | |
291 | } | |
292 | ||
293 | static int compat_put_ulong(unsigned long arg, compat_ulong_t val) | |
294 | { | |
295 | return put_user(val, (compat_ulong_t __user *)compat_ptr(arg)); | |
296 | } | |
297 | ||
298 | static int compat_put_u64(unsigned long arg, u64 val) | |
299 | { | |
300 | return put_user(val, (compat_u64 __user *)compat_ptr(arg)); | |
301 | } | |
302 | #endif | |
303 | ||
633a08b8 AV |
304 | int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode, |
305 | unsigned cmd, unsigned long arg) | |
306 | { | |
307 | struct gendisk *disk = bdev->bd_disk; | |
d4430d62 AV |
308 | |
309 | if (disk->fops->ioctl) | |
310 | return disk->fops->ioctl(bdev, mode, cmd, arg); | |
633a08b8 | 311 | |
633a08b8 AV |
312 | return -ENOTTY; |
313 | } | |
314 | /* | |
315 | * For the record: _GPL here is only because somebody decided to slap it | |
316 | * on the previous export. Sheer idiocy, since it wasn't copyrightable | |
317 | * at all and could be open-coded without any exports by anybody who cares. | |
318 | */ | |
319 | EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl); | |
320 | ||
ee6a129d AB |
321 | #ifdef CONFIG_COMPAT |
322 | /* | |
323 | * This is the equivalent of compat_ptr_ioctl(), to be used by block | |
324 | * drivers that implement only commands that are completely compatible | |
325 | * between 32-bit and 64-bit user space | |
326 | */ | |
327 | int blkdev_compat_ptr_ioctl(struct block_device *bdev, fmode_t mode, | |
328 | unsigned cmd, unsigned long arg) | |
329 | { | |
330 | struct gendisk *disk = bdev->bd_disk; | |
331 | ||
332 | if (disk->fops->ioctl) | |
333 | return disk->fops->ioctl(bdev, mode, cmd, | |
334 | (unsigned long)compat_ptr(arg)); | |
335 | ||
336 | return -ENOIOCTLCMD; | |
337 | } | |
338 | EXPORT_SYMBOL(blkdev_compat_ptr_ioctl); | |
339 | #endif | |
340 | ||
bbd3e064 CH |
341 | static int blkdev_pr_register(struct block_device *bdev, |
342 | struct pr_registration __user *arg) | |
343 | { | |
344 | const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; | |
345 | struct pr_registration reg; | |
346 | ||
347 | if (!capable(CAP_SYS_ADMIN)) | |
348 | return -EPERM; | |
349 | if (!ops || !ops->pr_register) | |
350 | return -EOPNOTSUPP; | |
351 | if (copy_from_user(®, arg, sizeof(reg))) | |
352 | return -EFAULT; | |
353 | ||
354 | if (reg.flags & ~PR_FL_IGNORE_KEY) | |
355 | return -EOPNOTSUPP; | |
356 | return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags); | |
357 | } | |
358 | ||
359 | static int blkdev_pr_reserve(struct block_device *bdev, | |
360 | struct pr_reservation __user *arg) | |
361 | { | |
362 | const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; | |
363 | struct pr_reservation rsv; | |
364 | ||
365 | if (!capable(CAP_SYS_ADMIN)) | |
366 | return -EPERM; | |
367 | if (!ops || !ops->pr_reserve) | |
368 | return -EOPNOTSUPP; | |
369 | if (copy_from_user(&rsv, arg, sizeof(rsv))) | |
370 | return -EFAULT; | |
371 | ||
372 | if (rsv.flags & ~PR_FL_IGNORE_KEY) | |
373 | return -EOPNOTSUPP; | |
374 | return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags); | |
375 | } | |
376 | ||
377 | static int blkdev_pr_release(struct block_device *bdev, | |
378 | struct pr_reservation __user *arg) | |
379 | { | |
380 | const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; | |
381 | struct pr_reservation rsv; | |
382 | ||
383 | if (!capable(CAP_SYS_ADMIN)) | |
384 | return -EPERM; | |
385 | if (!ops || !ops->pr_release) | |
386 | return -EOPNOTSUPP; | |
387 | if (copy_from_user(&rsv, arg, sizeof(rsv))) | |
388 | return -EFAULT; | |
389 | ||
390 | if (rsv.flags) | |
391 | return -EOPNOTSUPP; | |
392 | return ops->pr_release(bdev, rsv.key, rsv.type); | |
393 | } | |
394 | ||
395 | static int blkdev_pr_preempt(struct block_device *bdev, | |
396 | struct pr_preempt __user *arg, bool abort) | |
397 | { | |
398 | const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; | |
399 | struct pr_preempt p; | |
400 | ||
401 | if (!capable(CAP_SYS_ADMIN)) | |
402 | return -EPERM; | |
403 | if (!ops || !ops->pr_preempt) | |
404 | return -EOPNOTSUPP; | |
405 | if (copy_from_user(&p, arg, sizeof(p))) | |
406 | return -EFAULT; | |
407 | ||
408 | if (p.flags) | |
409 | return -EOPNOTSUPP; | |
410 | return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort); | |
411 | } | |
412 | ||
413 | static int blkdev_pr_clear(struct block_device *bdev, | |
414 | struct pr_clear __user *arg) | |
415 | { | |
416 | const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; | |
417 | struct pr_clear c; | |
418 | ||
419 | if (!capable(CAP_SYS_ADMIN)) | |
420 | return -EPERM; | |
421 | if (!ops || !ops->pr_clear) | |
422 | return -EOPNOTSUPP; | |
423 | if (copy_from_user(&c, arg, sizeof(c))) | |
424 | return -EFAULT; | |
425 | ||
426 | if (c.flags) | |
427 | return -EOPNOTSUPP; | |
428 | return ops->pr_clear(bdev, c.key); | |
429 | } | |
430 | ||
07d106d0 LT |
431 | /* |
432 | * Is it an unrecognized ioctl? The correct returns are either | |
433 | * ENOTTY (final) or ENOIOCTLCMD ("I don't know this one, try a | |
434 | * fallback"). ENOIOCTLCMD gets turned into ENOTTY by the ioctl | |
435 | * code before returning. | |
436 | * | |
437 | * Confused drivers sometimes return EINVAL, which is wrong. It | |
438 | * means "I understood the ioctl command, but the parameters to | |
439 | * it were wrong". | |
440 | * | |
441 | * We should aim to just fix the broken drivers, the EINVAL case | |
442 | * should go away. | |
443 | */ | |
444 | static inline int is_unrecognized_ioctl(int ret) | |
445 | { | |
446 | return ret == -EINVAL || | |
447 | ret == -ENOTTY || | |
448 | ret == -ENOIOCTLCMD; | |
449 | } | |
450 | ||
d8e4bb81 CH |
451 | static int blkdev_flushbuf(struct block_device *bdev, fmode_t mode, |
452 | unsigned cmd, unsigned long arg) | |
bb93e3a5 | 453 | { |
d8e4bb81 | 454 | int ret; |
bb93e3a5 | 455 | |
d8e4bb81 CH |
456 | if (!capable(CAP_SYS_ADMIN)) |
457 | return -EACCES; | |
bb93e3a5 | 458 | |
d8e4bb81 CH |
459 | ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); |
460 | if (!is_unrecognized_ioctl(ret)) | |
461 | return ret; | |
bb93e3a5 | 462 | |
d8e4bb81 CH |
463 | fsync_bdev(bdev); |
464 | invalidate_bdev(bdev); | |
465 | return 0; | |
466 | } | |
d30a2605 | 467 | |
d8e4bb81 CH |
468 | static int blkdev_roset(struct block_device *bdev, fmode_t mode, |
469 | unsigned cmd, unsigned long arg) | |
470 | { | |
471 | int ret, n; | |
d30a2605 | 472 | |
bb749b31 ID |
473 | if (!capable(CAP_SYS_ADMIN)) |
474 | return -EACCES; | |
475 | ||
d8e4bb81 CH |
476 | ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); |
477 | if (!is_unrecognized_ioctl(ret)) | |
478 | return ret; | |
d8e4bb81 CH |
479 | if (get_user(n, (int __user *)arg)) |
480 | return -EFAULT; | |
481 | set_device_ro(bdev, n); | |
482 | return 0; | |
483 | } | |
d30a2605 | 484 | |
d8e4bb81 CH |
485 | static int blkdev_getgeo(struct block_device *bdev, |
486 | struct hd_geometry __user *argp) | |
487 | { | |
488 | struct gendisk *disk = bdev->bd_disk; | |
489 | struct hd_geometry geo; | |
490 | int ret; | |
d30a2605 | 491 | |
d8e4bb81 CH |
492 | if (!argp) |
493 | return -EINVAL; | |
494 | if (!disk->fops->getgeo) | |
495 | return -ENOTTY; | |
496 | ||
497 | /* | |
498 | * We need to set the startsect first, the driver may | |
499 | * want to override it. | |
500 | */ | |
501 | memset(&geo, 0, sizeof(geo)); | |
502 | geo.start = get_start_sect(bdev); | |
503 | ret = disk->fops->getgeo(bdev, &geo); | |
504 | if (ret) | |
505 | return ret; | |
506 | if (copy_to_user(argp, &geo, sizeof(geo))) | |
507 | return -EFAULT; | |
508 | return 0; | |
509 | } | |
66ba32dc | 510 | |
bdc1ddad AB |
511 | #ifdef CONFIG_COMPAT |
512 | struct compat_hd_geometry { | |
513 | unsigned char heads; | |
514 | unsigned char sectors; | |
515 | unsigned short cylinders; | |
516 | u32 start; | |
517 | }; | |
518 | ||
519 | static int compat_hdio_getgeo(struct gendisk *disk, struct block_device *bdev, | |
520 | struct compat_hd_geometry __user *ugeo) | |
521 | { | |
522 | struct hd_geometry geo; | |
523 | int ret; | |
524 | ||
525 | if (!ugeo) | |
526 | return -EINVAL; | |
527 | if (!disk->fops->getgeo) | |
528 | return -ENOTTY; | |
529 | ||
530 | memset(&geo, 0, sizeof(geo)); | |
531 | /* | |
532 | * We need to set the startsect first, the driver may | |
533 | * want to override it. | |
534 | */ | |
535 | geo.start = get_start_sect(bdev); | |
536 | ret = disk->fops->getgeo(bdev, &geo); | |
537 | if (ret) | |
538 | return ret; | |
539 | ||
540 | ret = copy_to_user(ugeo, &geo, 4); | |
541 | ret |= put_user(geo.start, &ugeo->start); | |
542 | if (ret) | |
543 | ret = -EFAULT; | |
544 | ||
545 | return ret; | |
546 | } | |
547 | #endif | |
548 | ||
d8e4bb81 CH |
549 | /* set the logical block size */ |
550 | static int blkdev_bszset(struct block_device *bdev, fmode_t mode, | |
551 | int __user *argp) | |
552 | { | |
553 | int ret, n; | |
66ba32dc | 554 | |
d8e4bb81 CH |
555 | if (!capable(CAP_SYS_ADMIN)) |
556 | return -EACCES; | |
557 | if (!argp) | |
558 | return -EINVAL; | |
559 | if (get_user(n, argp)) | |
560 | return -EFAULT; | |
66ba32dc | 561 | |
d8e4bb81 CH |
562 | if (!(mode & FMODE_EXCL)) { |
563 | bdgrab(bdev); | |
564 | if (blkdev_get(bdev, mode | FMODE_EXCL, &bdev) < 0) | |
565 | return -EBUSY; | |
66ba32dc | 566 | } |
d30a2605 | 567 | |
d8e4bb81 CH |
568 | ret = set_blocksize(bdev, n); |
569 | if (!(mode & FMODE_EXCL)) | |
570 | blkdev_put(bdev, mode | FMODE_EXCL); | |
571 | return ret; | |
572 | } | |
a885c8c4 | 573 | |
d8e4bb81 CH |
574 | /* |
575 | * always keep this in sync with compat_blkdev_ioctl() | |
576 | */ | |
577 | int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, | |
578 | unsigned long arg) | |
579 | { | |
d8e4bb81 CH |
580 | void __user *argp = (void __user *)arg; |
581 | loff_t size; | |
582 | unsigned int max_sectors; | |
583 | ||
584 | switch (cmd) { | |
585 | case BLKFLSBUF: | |
586 | return blkdev_flushbuf(bdev, mode, cmd, arg); | |
587 | case BLKROSET: | |
588 | return blkdev_roset(bdev, mode, cmd, arg); | |
589 | case BLKDISCARD: | |
590 | return blk_ioctl_discard(bdev, mode, arg, 0); | |
591 | case BLKSECDISCARD: | |
592 | return blk_ioctl_discard(bdev, mode, arg, | |
593 | BLKDEV_DISCARD_SECURE); | |
594 | case BLKZEROOUT: | |
595 | return blk_ioctl_zeroout(bdev, mode, arg); | |
3ed05a98 ST |
596 | case BLKREPORTZONE: |
597 | return blkdev_report_zones_ioctl(bdev, mode, cmd, arg); | |
598 | case BLKRESETZONE: | |
e876df1f AJ |
599 | case BLKOPENZONE: |
600 | case BLKCLOSEZONE: | |
601 | case BLKFINISHZONE: | |
602 | return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg); | |
72cd8757 DLM |
603 | case BLKGETZONESZ: |
604 | return put_uint(arg, bdev_zone_sectors(bdev)); | |
65e4e3ee | 605 | case BLKGETNRZONES: |
9b38bb4b | 606 | return put_uint(arg, blkdev_nr_zones(bdev->bd_disk)); |
d8e4bb81 CH |
607 | case HDIO_GETGEO: |
608 | return blkdev_getgeo(bdev, argp); | |
45048d09 AV |
609 | case BLKRAGET: |
610 | case BLKFRAGET: | |
611 | if (!arg) | |
612 | return -EINVAL; | |
efa7c9f9 | 613 | return put_long(arg, (bdev->bd_bdi->ra_pages*PAGE_SIZE) / 512); |
45048d09 AV |
614 | case BLKROGET: |
615 | return put_int(arg, bdev_read_only(bdev) != 0); | |
ac481c20 | 616 | case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */ |
45048d09 | 617 | return put_int(arg, block_size(bdev)); |
ac481c20 | 618 | case BLKSSZGET: /* get block device logical block size */ |
e1defc4f | 619 | return put_int(arg, bdev_logical_block_size(bdev)); |
ac481c20 MP |
620 | case BLKPBSZGET: /* get block device physical block size */ |
621 | return put_uint(arg, bdev_physical_block_size(bdev)); | |
622 | case BLKIOMIN: | |
623 | return put_uint(arg, bdev_io_min(bdev)); | |
624 | case BLKIOOPT: | |
625 | return put_uint(arg, bdev_io_opt(bdev)); | |
626 | case BLKALIGNOFF: | |
627 | return put_int(arg, bdev_alignment_offset(bdev)); | |
98262f27 | 628 | case BLKDISCARDZEROES: |
48920ff2 | 629 | return put_uint(arg, 0); |
45048d09 | 630 | case BLKSECTGET: |
63f26496 AM |
631 | max_sectors = min_t(unsigned int, USHRT_MAX, |
632 | queue_max_sectors(bdev_get_queue(bdev))); | |
633 | return put_ushort(arg, max_sectors); | |
ef00f59c MP |
634 | case BLKROTATIONAL: |
635 | return put_ushort(arg, !blk_queue_nonrot(bdev_get_queue(bdev))); | |
45048d09 AV |
636 | case BLKRASET: |
637 | case BLKFRASET: | |
638 | if(!capable(CAP_SYS_ADMIN)) | |
639 | return -EACCES; | |
efa7c9f9 | 640 | bdev->bd_bdi->ra_pages = (arg * 512) / PAGE_SIZE; |
45048d09 AV |
641 | return 0; |
642 | case BLKBSZSET: | |
d8e4bb81 | 643 | return blkdev_bszset(bdev, mode, argp); |
45048d09 | 644 | case BLKPG: |
d8e4bb81 | 645 | return blkpg_ioctl(bdev, argp); |
45048d09 | 646 | case BLKRRPART: |
d8e4bb81 | 647 | return blkdev_reread_part(bdev); |
45048d09 | 648 | case BLKGETSIZE: |
77304d2a | 649 | size = i_size_read(bdev->bd_inode); |
45048d09 AV |
650 | if ((size >> 9) > ~0UL) |
651 | return -EFBIG; | |
652 | return put_ulong(arg, size >> 9); | |
653 | case BLKGETSIZE64: | |
77304d2a | 654 | return put_u64(arg, i_size_read(bdev->bd_inode)); |
45048d09 AV |
655 | case BLKTRACESTART: |
656 | case BLKTRACESTOP: | |
657 | case BLKTRACESETUP: | |
658 | case BLKTRACETEARDOWN: | |
d8e4bb81 | 659 | return blk_trace_ioctl(bdev, cmd, argp); |
bbd3e064 CH |
660 | case IOC_PR_REGISTER: |
661 | return blkdev_pr_register(bdev, argp); | |
662 | case IOC_PR_RESERVE: | |
663 | return blkdev_pr_reserve(bdev, argp); | |
664 | case IOC_PR_RELEASE: | |
665 | return blkdev_pr_release(bdev, argp); | |
666 | case IOC_PR_PREEMPT: | |
667 | return blkdev_pr_preempt(bdev, argp, false); | |
668 | case IOC_PR_PREEMPT_ABORT: | |
669 | return blkdev_pr_preempt(bdev, argp, true); | |
670 | case IOC_PR_CLEAR: | |
671 | return blkdev_pr_clear(bdev, argp); | |
45048d09 | 672 | default: |
d8e4bb81 | 673 | return __blkdev_driver_ioctl(bdev, mode, cmd, arg); |
45048d09 | 674 | } |
1da177e4 | 675 | } |
68f66feb | 676 | EXPORT_SYMBOL_GPL(blkdev_ioctl); |
bdc1ddad AB |
677 | |
678 | #ifdef CONFIG_COMPAT | |
679 | struct compat_blkpg_ioctl_arg { | |
680 | compat_int_t op; | |
681 | compat_int_t flags; | |
682 | compat_int_t datalen; | |
683 | compat_caddr_t data; | |
684 | }; | |
685 | ||
686 | static int compat_blkpg_ioctl(struct block_device *bdev, fmode_t mode, | |
687 | unsigned int cmd, struct compat_blkpg_ioctl_arg __user *ua32) | |
688 | { | |
689 | struct blkpg_ioctl_arg __user *a = compat_alloc_user_space(sizeof(*a)); | |
690 | compat_caddr_t udata; | |
691 | compat_int_t n; | |
692 | int err; | |
693 | ||
694 | err = get_user(n, &ua32->op); | |
695 | err |= put_user(n, &a->op); | |
696 | err |= get_user(n, &ua32->flags); | |
697 | err |= put_user(n, &a->flags); | |
698 | err |= get_user(n, &ua32->datalen); | |
699 | err |= put_user(n, &a->datalen); | |
700 | err |= get_user(udata, &ua32->data); | |
701 | err |= put_user(compat_ptr(udata), &a->data); | |
702 | if (err) | |
703 | return err; | |
704 | ||
705 | return blkdev_ioctl(bdev, mode, cmd, (unsigned long)a); | |
706 | } | |
707 | ||
708 | #define BLKBSZGET_32 _IOR(0x12, 112, int) | |
709 | #define BLKBSZSET_32 _IOW(0x12, 113, int) | |
710 | #define BLKGETSIZE64_32 _IOR(0x12, 114, int) | |
711 | ||
712 | /* Most of the generic ioctls are handled in the normal fallback path. | |
713 | This assumes the blkdev's low level compat_ioctl always returns | |
714 | ENOIOCTLCMD for unknown ioctls. */ | |
715 | long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg) | |
716 | { | |
717 | int ret = -ENOIOCTLCMD; | |
718 | struct inode *inode = file->f_mapping->host; | |
719 | struct block_device *bdev = inode->i_bdev; | |
720 | struct gendisk *disk = bdev->bd_disk; | |
721 | fmode_t mode = file->f_mode; | |
722 | loff_t size; | |
723 | unsigned int max_sectors; | |
724 | ||
725 | /* | |
726 | * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have | |
727 | * to updated it before every ioctl. | |
728 | */ | |
729 | if (file->f_flags & O_NDELAY) | |
730 | mode |= FMODE_NDELAY; | |
731 | else | |
732 | mode &= ~FMODE_NDELAY; | |
733 | ||
734 | switch (cmd) { | |
735 | case HDIO_GETGEO: | |
736 | return compat_hdio_getgeo(disk, bdev, compat_ptr(arg)); | |
737 | case BLKPBSZGET: | |
738 | return compat_put_uint(arg, bdev_physical_block_size(bdev)); | |
739 | case BLKIOMIN: | |
740 | return compat_put_uint(arg, bdev_io_min(bdev)); | |
741 | case BLKIOOPT: | |
742 | return compat_put_uint(arg, bdev_io_opt(bdev)); | |
743 | case BLKALIGNOFF: | |
744 | return compat_put_int(arg, bdev_alignment_offset(bdev)); | |
745 | case BLKDISCARDZEROES: | |
746 | return compat_put_uint(arg, 0); | |
747 | case BLKFLSBUF: | |
748 | case BLKROSET: | |
749 | case BLKDISCARD: | |
750 | case BLKSECDISCARD: | |
751 | case BLKZEROOUT: | |
752 | /* | |
753 | * the ones below are implemented in blkdev_locked_ioctl, | |
754 | * but we call blkdev_ioctl, which gets the lock for us | |
755 | */ | |
756 | case BLKRRPART: | |
757 | case BLKREPORTZONE: | |
758 | case BLKRESETZONE: | |
759 | case BLKOPENZONE: | |
760 | case BLKCLOSEZONE: | |
761 | case BLKFINISHZONE: | |
762 | case BLKGETZONESZ: | |
763 | case BLKGETNRZONES: | |
764 | return blkdev_ioctl(bdev, mode, cmd, | |
765 | (unsigned long)compat_ptr(arg)); | |
766 | case BLKBSZSET_32: | |
767 | return blkdev_ioctl(bdev, mode, BLKBSZSET, | |
768 | (unsigned long)compat_ptr(arg)); | |
769 | case BLKPG: | |
770 | return compat_blkpg_ioctl(bdev, mode, cmd, compat_ptr(arg)); | |
771 | case BLKRAGET: | |
772 | case BLKFRAGET: | |
773 | if (!arg) | |
774 | return -EINVAL; | |
775 | return compat_put_long(arg, | |
776 | (bdev->bd_bdi->ra_pages * PAGE_SIZE) / 512); | |
777 | case BLKROGET: /* compatible */ | |
778 | return compat_put_int(arg, bdev_read_only(bdev) != 0); | |
779 | case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */ | |
780 | return compat_put_int(arg, block_size(bdev)); | |
781 | case BLKSSZGET: /* get block device hardware sector size */ | |
782 | return compat_put_int(arg, bdev_logical_block_size(bdev)); | |
783 | case BLKSECTGET: | |
784 | max_sectors = min_t(unsigned int, USHRT_MAX, | |
785 | queue_max_sectors(bdev_get_queue(bdev))); | |
786 | return compat_put_ushort(arg, max_sectors); | |
787 | case BLKROTATIONAL: | |
788 | return compat_put_ushort(arg, | |
789 | !blk_queue_nonrot(bdev_get_queue(bdev))); | |
790 | case BLKRASET: /* compatible, but no compat_ptr (!) */ | |
791 | case BLKFRASET: | |
792 | if (!capable(CAP_SYS_ADMIN)) | |
793 | return -EACCES; | |
794 | bdev->bd_bdi->ra_pages = (arg * 512) / PAGE_SIZE; | |
795 | return 0; | |
796 | case BLKGETSIZE: | |
797 | size = i_size_read(bdev->bd_inode); | |
798 | if ((size >> 9) > ~0UL) | |
799 | return -EFBIG; | |
800 | return compat_put_ulong(arg, size >> 9); | |
801 | ||
802 | case BLKGETSIZE64_32: | |
803 | return compat_put_u64(arg, i_size_read(bdev->bd_inode)); | |
804 | ||
805 | case BLKTRACESETUP32: | |
806 | case BLKTRACESTART: /* compatible */ | |
807 | case BLKTRACESTOP: /* compatible */ | |
808 | case BLKTRACETEARDOWN: /* compatible */ | |
809 | ret = blk_trace_ioctl(bdev, cmd, compat_ptr(arg)); | |
810 | return ret; | |
811 | case IOC_PR_REGISTER: | |
812 | case IOC_PR_RESERVE: | |
813 | case IOC_PR_RELEASE: | |
814 | case IOC_PR_PREEMPT: | |
815 | case IOC_PR_PREEMPT_ABORT: | |
816 | case IOC_PR_CLEAR: | |
817 | return blkdev_ioctl(bdev, mode, cmd, | |
818 | (unsigned long)compat_ptr(arg)); | |
819 | default: | |
820 | if (disk->fops->compat_ioctl) | |
821 | ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg); | |
822 | return ret; | |
823 | } | |
824 | } | |
825 | #endif |