Commit | Line | Data |
---|---|---|
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 | 14 | |
5fb889f5 AB |
15 | static int blkpg_do_ioctl(struct block_device *bdev, |
16 | struct blkpg_partition __user *upart, int op) | |
1da177e4 LT |
17 | { |
18 | struct block_device *bdevp; | |
19 | struct gendisk *disk; | |
c83f6bf9 | 20 | struct hd_struct *part, *lpart; |
1da177e4 | 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; | |
5fb889f5 | 28 | if (copy_from_user(&p, upart, sizeof(struct blkpg_partition))) |
1da177e4 LT |
29 | return -EFAULT; |
30 | disk = bdev->bd_disk; | |
31 | if (bdev != bdev->bd_contains) | |
32 | return -EINVAL; | |
cf771cb5 | 33 | partno = p.pno; |
540eed56 | 34 | if (partno <= 0) |
1da177e4 | 35 | return -EINVAL; |
5fb889f5 | 36 | switch (op) { |
1da177e4 LT |
37 | case BLKPG_ADD_PARTITION: |
38 | start = p.start >> 9; | |
39 | length = p.length >> 9; | |
c83f6bf9 VG |
40 | /* check for fit in a hd_struct */ |
41 | if (sizeof(sector_t) == sizeof(long) && | |
1da177e4 LT |
42 | sizeof(long long) > sizeof(long)) { |
43 | long pstart = start, plength = length; | |
44 | if (pstart != start || plength != length | |
2bd6efad | 45 | || pstart < 0 || plength < 0 || partno > 65535) |
1da177e4 LT |
46 | return -EINVAL; |
47 | } | |
633395b6 SH |
48 | /* check if partition is aligned to blocksize */ |
49 | if (p.start & (bdev_logical_block_size(bdev) - 1)) | |
50 | return -EINVAL; | |
88e34126 | 51 | |
c039e313 | 52 | mutex_lock(&bdev->bd_mutex); |
88e34126 | 53 | |
1da177e4 | 54 | /* overlap? */ |
e71bf0d0 TH |
55 | disk_part_iter_init(&piter, disk, |
56 | DISK_PITER_INCL_EMPTY); | |
57 | while ((part = disk_part_iter_next(&piter))) { | |
58 | if (!(start + length <= part->start_sect || | |
59 | start >= part->start_sect + part->nr_sects)) { | |
60 | disk_part_iter_exit(&piter); | |
c039e313 | 61 | mutex_unlock(&bdev->bd_mutex); |
1da177e4 LT |
62 | return -EBUSY; |
63 | } | |
64 | } | |
e71bf0d0 TH |
65 | disk_part_iter_exit(&piter); |
66 | ||
1da177e4 | 67 | /* all seems OK */ |
ba32929a | 68 | part = add_partition(disk, partno, start, length, |
6d1d8050 | 69 | ADDPART_FLAG_NONE, NULL); |
c039e313 | 70 | mutex_unlock(&bdev->bd_mutex); |
c7d1ba41 | 71 | return PTR_ERR_OR_ZERO(part); |
1da177e4 | 72 | case BLKPG_DEL_PARTITION: |
e71bf0d0 TH |
73 | part = disk_get_part(disk, partno); |
74 | if (!part) | |
1da177e4 | 75 | return -ENXIO; |
e71bf0d0 TH |
76 | |
77 | bdevp = bdget(part_devt(part)); | |
78 | disk_put_part(part); | |
1da177e4 LT |
79 | if (!bdevp) |
80 | return -ENOMEM; | |
e71bf0d0 | 81 | |
2e7b651d | 82 | mutex_lock(&bdevp->bd_mutex); |
1da177e4 | 83 | if (bdevp->bd_openers) { |
c039e313 | 84 | mutex_unlock(&bdevp->bd_mutex); |
1da177e4 LT |
85 | bdput(bdevp); |
86 | return -EBUSY; | |
87 | } | |
88 | /* all seems OK */ | |
89 | fsync_bdev(bdevp); | |
f98393a6 | 90 | invalidate_bdev(bdevp); |
1da177e4 | 91 | |
6d740cd5 | 92 | mutex_lock_nested(&bdev->bd_mutex, 1); |
cf771cb5 | 93 | delete_partition(disk, partno); |
c039e313 AV |
94 | mutex_unlock(&bdev->bd_mutex); |
95 | mutex_unlock(&bdevp->bd_mutex); | |
1da177e4 LT |
96 | bdput(bdevp); |
97 | ||
c83f6bf9 VG |
98 | return 0; |
99 | case BLKPG_RESIZE_PARTITION: | |
100 | start = p.start >> 9; | |
101 | /* new length of partition in bytes */ | |
102 | length = p.length >> 9; | |
103 | /* check for fit in a hd_struct */ | |
104 | if (sizeof(sector_t) == sizeof(long) && | |
105 | sizeof(long long) > sizeof(long)) { | |
106 | long pstart = start, plength = length; | |
107 | if (pstart != start || plength != length | |
108 | || pstart < 0 || plength < 0) | |
109 | return -EINVAL; | |
110 | } | |
111 | part = disk_get_part(disk, partno); | |
112 | if (!part) | |
113 | return -ENXIO; | |
114 | bdevp = bdget(part_devt(part)); | |
115 | if (!bdevp) { | |
116 | disk_put_part(part); | |
117 | return -ENOMEM; | |
118 | } | |
119 | mutex_lock(&bdevp->bd_mutex); | |
120 | mutex_lock_nested(&bdev->bd_mutex, 1); | |
121 | if (start != part->start_sect) { | |
122 | mutex_unlock(&bdevp->bd_mutex); | |
123 | mutex_unlock(&bdev->bd_mutex); | |
124 | bdput(bdevp); | |
125 | disk_put_part(part); | |
126 | return -EINVAL; | |
127 | } | |
128 | /* overlap? */ | |
129 | disk_part_iter_init(&piter, disk, | |
130 | DISK_PITER_INCL_EMPTY); | |
131 | while ((lpart = disk_part_iter_next(&piter))) { | |
132 | if (lpart->partno != partno && | |
133 | !(start + length <= lpart->start_sect || | |
134 | start >= lpart->start_sect + lpart->nr_sects) | |
135 | ) { | |
136 | disk_part_iter_exit(&piter); | |
137 | mutex_unlock(&bdevp->bd_mutex); | |
138 | mutex_unlock(&bdev->bd_mutex); | |
139 | bdput(bdevp); | |
140 | disk_put_part(part); | |
141 | return -EBUSY; | |
142 | } | |
143 | } | |
144 | disk_part_iter_exit(&piter); | |
145 | part_nr_sects_write(part, (sector_t)length); | |
146 | i_size_write(bdevp->bd_inode, p.length); | |
147 | mutex_unlock(&bdevp->bd_mutex); | |
148 | mutex_unlock(&bdev->bd_mutex); | |
149 | bdput(bdevp); | |
150 | disk_put_part(part); | |
1da177e4 LT |
151 | return 0; |
152 | default: | |
153 | return -EINVAL; | |
154 | } | |
155 | } | |
156 | ||
5fb889f5 AB |
157 | static int blkpg_ioctl(struct block_device *bdev, |
158 | struct blkpg_ioctl_arg __user *arg) | |
159 | { | |
160 | struct blkpg_partition __user *udata; | |
161 | int op; | |
162 | ||
163 | if (get_user(op, &arg->op) || get_user(udata, &arg->data)) | |
164 | return -EFAULT; | |
165 | ||
166 | return blkpg_do_ioctl(bdev, udata, op); | |
167 | } | |
168 | ||
169 | #ifdef CONFIG_COMPAT | |
170 | struct compat_blkpg_ioctl_arg { | |
171 | compat_int_t op; | |
172 | compat_int_t flags; | |
173 | compat_int_t datalen; | |
174 | compat_caddr_t data; | |
175 | }; | |
176 | ||
177 | static int compat_blkpg_ioctl(struct block_device *bdev, | |
178 | struct compat_blkpg_ioctl_arg __user *arg) | |
179 | { | |
180 | compat_caddr_t udata; | |
181 | int op; | |
182 | ||
183 | if (get_user(op, &arg->op) || get_user(udata, &arg->data)) | |
184 | return -EFAULT; | |
185 | ||
186 | return blkpg_do_ioctl(bdev, compat_ptr(udata), op); | |
187 | } | |
188 | #endif | |
189 | ||
f0b870df | 190 | static int blkdev_reread_part(struct block_device *bdev) |
1da177e4 | 191 | { |
f0b870df CH |
192 | int ret; |
193 | ||
142fe8f4 | 194 | if (!disk_part_scan_enabled(bdev->bd_disk) || bdev != bdev->bd_contains) |
1da177e4 LT |
195 | return -EINVAL; |
196 | if (!capable(CAP_SYS_ADMIN)) | |
197 | return -EACCES; | |
be324177 | 198 | |
b04a5636 | 199 | mutex_lock(&bdev->bd_mutex); |
f0b870df | 200 | ret = bdev_disk_changed(bdev, false); |
c039e313 | 201 | mutex_unlock(&bdev->bd_mutex); |
be324177 | 202 | |
f0b870df | 203 | return ret; |
1da177e4 LT |
204 | } |
205 | ||
d8e4bb81 CH |
206 | static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode, |
207 | unsigned long arg, unsigned long flags) | |
d30a2605 | 208 | { |
d8e4bb81 CH |
209 | uint64_t range[2]; |
210 | uint64_t start, len; | |
351499a1 DM |
211 | struct request_queue *q = bdev_get_queue(bdev); |
212 | struct address_space *mapping = bdev->bd_inode->i_mapping; | |
213 | ||
d8e4bb81 CH |
214 | |
215 | if (!(mode & FMODE_WRITE)) | |
216 | return -EBADF; | |
217 | ||
351499a1 DM |
218 | if (!blk_queue_discard(q)) |
219 | return -EOPNOTSUPP; | |
220 | ||
d8e4bb81 CH |
221 | if (copy_from_user(range, (void __user *)arg, sizeof(range))) |
222 | return -EFAULT; | |
223 | ||
224 | start = range[0]; | |
225 | len = range[1]; | |
8d57a98c | 226 | |
d30a2605 DW |
227 | if (start & 511) |
228 | return -EINVAL; | |
229 | if (len & 511) | |
230 | return -EINVAL; | |
d30a2605 | 231 | |
351499a1 | 232 | if (start + len > i_size_read(bdev->bd_inode)) |
d30a2605 | 233 | return -EINVAL; |
0bd1ed48 | 234 | truncate_inode_pages_range(mapping, start, start + len - 1); |
351499a1 DM |
235 | return blkdev_issue_discard(bdev, start >> 9, len >> 9, |
236 | GFP_KERNEL, flags); | |
d30a2605 DW |
237 | } |
238 | ||
d8e4bb81 CH |
239 | static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode, |
240 | unsigned long arg) | |
66ba32dc | 241 | { |
d8e4bb81 | 242 | uint64_t range[2]; |
22dd6d35 DW |
243 | struct address_space *mapping; |
244 | uint64_t start, end, len; | |
d8e4bb81 CH |
245 | |
246 | if (!(mode & FMODE_WRITE)) | |
247 | return -EBADF; | |
248 | ||
249 | if (copy_from_user(range, (void __user *)arg, sizeof(range))) | |
250 | return -EFAULT; | |
251 | ||
252 | start = range[0]; | |
253 | len = range[1]; | |
22dd6d35 | 254 | end = start + len - 1; |
d8e4bb81 | 255 | |
66ba32dc MP |
256 | if (start & 511) |
257 | return -EINVAL; | |
258 | if (len & 511) | |
259 | return -EINVAL; | |
22dd6d35 DW |
260 | if (end >= (uint64_t)i_size_read(bdev->bd_inode)) |
261 | return -EINVAL; | |
262 | if (end < start) | |
66ba32dc MP |
263 | return -EINVAL; |
264 | ||
22dd6d35 DW |
265 | /* Invalidate the page cache, including dirty pages */ |
266 | mapping = bdev->bd_inode->i_mapping; | |
267 | truncate_inode_pages_range(mapping, start, end); | |
268 | ||
269 | return blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL, | |
ee472d83 | 270 | BLKDEV_ZERO_NOUNMAP); |
66ba32dc MP |
271 | } |
272 | ||
9b81648c | 273 | static int put_ushort(unsigned short __user *argp, unsigned short val) |
1da177e4 | 274 | { |
9b81648c | 275 | return put_user(val, argp); |
1da177e4 LT |
276 | } |
277 | ||
9b81648c | 278 | static int put_int(int __user *argp, int val) |
1da177e4 | 279 | { |
9b81648c | 280 | return put_user(val, argp); |
1da177e4 LT |
281 | } |
282 | ||
9b81648c | 283 | static int put_uint(unsigned int __user *argp, unsigned int val) |
ac481c20 | 284 | { |
9b81648c | 285 | return put_user(val, argp); |
ac481c20 MP |
286 | } |
287 | ||
9b81648c | 288 | static int put_long(long __user *argp, long val) |
1da177e4 | 289 | { |
9b81648c | 290 | return put_user(val, argp); |
1da177e4 LT |
291 | } |
292 | ||
9b81648c | 293 | static int put_ulong(unsigned long __user *argp, unsigned long val) |
1da177e4 | 294 | { |
9b81648c | 295 | return put_user(val, argp); |
1da177e4 LT |
296 | } |
297 | ||
9b81648c | 298 | static int put_u64(u64 __user *argp, u64 val) |
1da177e4 | 299 | { |
9b81648c | 300 | return put_user(val, argp); |
1da177e4 LT |
301 | } |
302 | ||
bdc1ddad | 303 | #ifdef CONFIG_COMPAT |
9b81648c | 304 | static int compat_put_long(compat_long_t *argp, long val) |
bdc1ddad | 305 | { |
9b81648c | 306 | return put_user(val, argp); |
bdc1ddad AB |
307 | } |
308 | ||
9b81648c | 309 | static int compat_put_ulong(compat_ulong_t *argp, compat_ulong_t val) |
bdc1ddad | 310 | { |
9b81648c | 311 | return put_user(val, argp); |
bdc1ddad AB |
312 | } |
313 | #endif | |
314 | ||
633a08b8 AV |
315 | int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode, |
316 | unsigned cmd, unsigned long arg) | |
317 | { | |
318 | struct gendisk *disk = bdev->bd_disk; | |
d4430d62 AV |
319 | |
320 | if (disk->fops->ioctl) | |
321 | return disk->fops->ioctl(bdev, mode, cmd, arg); | |
633a08b8 | 322 | |
633a08b8 AV |
323 | return -ENOTTY; |
324 | } | |
325 | /* | |
326 | * For the record: _GPL here is only because somebody decided to slap it | |
327 | * on the previous export. Sheer idiocy, since it wasn't copyrightable | |
328 | * at all and could be open-coded without any exports by anybody who cares. | |
329 | */ | |
330 | EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl); | |
331 | ||
ee6a129d AB |
332 | #ifdef CONFIG_COMPAT |
333 | /* | |
334 | * This is the equivalent of compat_ptr_ioctl(), to be used by block | |
335 | * drivers that implement only commands that are completely compatible | |
336 | * between 32-bit and 64-bit user space | |
337 | */ | |
338 | int blkdev_compat_ptr_ioctl(struct block_device *bdev, fmode_t mode, | |
339 | unsigned cmd, unsigned long arg) | |
340 | { | |
341 | struct gendisk *disk = bdev->bd_disk; | |
342 | ||
343 | if (disk->fops->ioctl) | |
344 | return disk->fops->ioctl(bdev, mode, cmd, | |
345 | (unsigned long)compat_ptr(arg)); | |
346 | ||
347 | return -ENOIOCTLCMD; | |
348 | } | |
349 | EXPORT_SYMBOL(blkdev_compat_ptr_ioctl); | |
350 | #endif | |
351 | ||
bbd3e064 CH |
352 | static int blkdev_pr_register(struct block_device *bdev, |
353 | struct pr_registration __user *arg) | |
354 | { | |
355 | const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; | |
356 | struct pr_registration reg; | |
357 | ||
358 | if (!capable(CAP_SYS_ADMIN)) | |
359 | return -EPERM; | |
360 | if (!ops || !ops->pr_register) | |
361 | return -EOPNOTSUPP; | |
362 | if (copy_from_user(®, arg, sizeof(reg))) | |
363 | return -EFAULT; | |
364 | ||
365 | if (reg.flags & ~PR_FL_IGNORE_KEY) | |
366 | return -EOPNOTSUPP; | |
367 | return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags); | |
368 | } | |
369 | ||
370 | static int blkdev_pr_reserve(struct block_device *bdev, | |
371 | struct pr_reservation __user *arg) | |
372 | { | |
373 | const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; | |
374 | struct pr_reservation rsv; | |
375 | ||
376 | if (!capable(CAP_SYS_ADMIN)) | |
377 | return -EPERM; | |
378 | if (!ops || !ops->pr_reserve) | |
379 | return -EOPNOTSUPP; | |
380 | if (copy_from_user(&rsv, arg, sizeof(rsv))) | |
381 | return -EFAULT; | |
382 | ||
383 | if (rsv.flags & ~PR_FL_IGNORE_KEY) | |
384 | return -EOPNOTSUPP; | |
385 | return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags); | |
386 | } | |
387 | ||
388 | static int blkdev_pr_release(struct block_device *bdev, | |
389 | struct pr_reservation __user *arg) | |
390 | { | |
391 | const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; | |
392 | struct pr_reservation rsv; | |
393 | ||
394 | if (!capable(CAP_SYS_ADMIN)) | |
395 | return -EPERM; | |
396 | if (!ops || !ops->pr_release) | |
397 | return -EOPNOTSUPP; | |
398 | if (copy_from_user(&rsv, arg, sizeof(rsv))) | |
399 | return -EFAULT; | |
400 | ||
401 | if (rsv.flags) | |
402 | return -EOPNOTSUPP; | |
403 | return ops->pr_release(bdev, rsv.key, rsv.type); | |
404 | } | |
405 | ||
406 | static int blkdev_pr_preempt(struct block_device *bdev, | |
407 | struct pr_preempt __user *arg, bool abort) | |
408 | { | |
409 | const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; | |
410 | struct pr_preempt p; | |
411 | ||
412 | if (!capable(CAP_SYS_ADMIN)) | |
413 | return -EPERM; | |
414 | if (!ops || !ops->pr_preempt) | |
415 | return -EOPNOTSUPP; | |
416 | if (copy_from_user(&p, arg, sizeof(p))) | |
417 | return -EFAULT; | |
418 | ||
419 | if (p.flags) | |
420 | return -EOPNOTSUPP; | |
421 | return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort); | |
422 | } | |
423 | ||
424 | static int blkdev_pr_clear(struct block_device *bdev, | |
425 | struct pr_clear __user *arg) | |
426 | { | |
427 | const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; | |
428 | struct pr_clear c; | |
429 | ||
430 | if (!capable(CAP_SYS_ADMIN)) | |
431 | return -EPERM; | |
432 | if (!ops || !ops->pr_clear) | |
433 | return -EOPNOTSUPP; | |
434 | if (copy_from_user(&c, arg, sizeof(c))) | |
435 | return -EFAULT; | |
436 | ||
437 | if (c.flags) | |
438 | return -EOPNOTSUPP; | |
439 | return ops->pr_clear(bdev, c.key); | |
440 | } | |
441 | ||
07d106d0 LT |
442 | /* |
443 | * Is it an unrecognized ioctl? The correct returns are either | |
444 | * ENOTTY (final) or ENOIOCTLCMD ("I don't know this one, try a | |
445 | * fallback"). ENOIOCTLCMD gets turned into ENOTTY by the ioctl | |
446 | * code before returning. | |
447 | * | |
448 | * Confused drivers sometimes return EINVAL, which is wrong. It | |
449 | * means "I understood the ioctl command, but the parameters to | |
450 | * it were wrong". | |
451 | * | |
452 | * We should aim to just fix the broken drivers, the EINVAL case | |
453 | * should go away. | |
454 | */ | |
455 | static inline int is_unrecognized_ioctl(int ret) | |
456 | { | |
457 | return ret == -EINVAL || | |
458 | ret == -ENOTTY || | |
459 | ret == -ENOIOCTLCMD; | |
460 | } | |
461 | ||
d8e4bb81 CH |
462 | static int blkdev_flushbuf(struct block_device *bdev, fmode_t mode, |
463 | unsigned cmd, unsigned long arg) | |
bb93e3a5 | 464 | { |
d8e4bb81 | 465 | int ret; |
bb93e3a5 | 466 | |
d8e4bb81 CH |
467 | if (!capable(CAP_SYS_ADMIN)) |
468 | return -EACCES; | |
bb93e3a5 | 469 | |
d8e4bb81 CH |
470 | ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); |
471 | if (!is_unrecognized_ioctl(ret)) | |
472 | return ret; | |
bb93e3a5 | 473 | |
d8e4bb81 CH |
474 | fsync_bdev(bdev); |
475 | invalidate_bdev(bdev); | |
476 | return 0; | |
477 | } | |
d30a2605 | 478 | |
d8e4bb81 CH |
479 | static int blkdev_roset(struct block_device *bdev, fmode_t mode, |
480 | unsigned cmd, unsigned long arg) | |
481 | { | |
482 | int ret, n; | |
d30a2605 | 483 | |
bb749b31 ID |
484 | if (!capable(CAP_SYS_ADMIN)) |
485 | return -EACCES; | |
486 | ||
d8e4bb81 CH |
487 | ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); |
488 | if (!is_unrecognized_ioctl(ret)) | |
489 | return ret; | |
d8e4bb81 CH |
490 | if (get_user(n, (int __user *)arg)) |
491 | return -EFAULT; | |
492 | set_device_ro(bdev, n); | |
493 | return 0; | |
494 | } | |
d30a2605 | 495 | |
d8e4bb81 CH |
496 | static int blkdev_getgeo(struct block_device *bdev, |
497 | struct hd_geometry __user *argp) | |
498 | { | |
499 | struct gendisk *disk = bdev->bd_disk; | |
500 | struct hd_geometry geo; | |
501 | int ret; | |
d30a2605 | 502 | |
d8e4bb81 CH |
503 | if (!argp) |
504 | return -EINVAL; | |
505 | if (!disk->fops->getgeo) | |
506 | return -ENOTTY; | |
507 | ||
508 | /* | |
509 | * We need to set the startsect first, the driver may | |
510 | * want to override it. | |
511 | */ | |
512 | memset(&geo, 0, sizeof(geo)); | |
513 | geo.start = get_start_sect(bdev); | |
514 | ret = disk->fops->getgeo(bdev, &geo); | |
515 | if (ret) | |
516 | return ret; | |
517 | if (copy_to_user(argp, &geo, sizeof(geo))) | |
518 | return -EFAULT; | |
519 | return 0; | |
520 | } | |
66ba32dc | 521 | |
bdc1ddad AB |
522 | #ifdef CONFIG_COMPAT |
523 | struct compat_hd_geometry { | |
524 | unsigned char heads; | |
525 | unsigned char sectors; | |
526 | unsigned short cylinders; | |
527 | u32 start; | |
528 | }; | |
529 | ||
9b81648c AB |
530 | static int compat_hdio_getgeo(struct block_device *bdev, |
531 | struct compat_hd_geometry __user *ugeo) | |
bdc1ddad | 532 | { |
9b81648c | 533 | struct gendisk *disk = bdev->bd_disk; |
bdc1ddad AB |
534 | struct hd_geometry geo; |
535 | int ret; | |
536 | ||
537 | if (!ugeo) | |
538 | return -EINVAL; | |
539 | if (!disk->fops->getgeo) | |
540 | return -ENOTTY; | |
541 | ||
542 | memset(&geo, 0, sizeof(geo)); | |
543 | /* | |
544 | * We need to set the startsect first, the driver may | |
545 | * want to override it. | |
546 | */ | |
547 | geo.start = get_start_sect(bdev); | |
548 | ret = disk->fops->getgeo(bdev, &geo); | |
549 | if (ret) | |
550 | return ret; | |
551 | ||
552 | ret = copy_to_user(ugeo, &geo, 4); | |
553 | ret |= put_user(geo.start, &ugeo->start); | |
554 | if (ret) | |
555 | ret = -EFAULT; | |
556 | ||
557 | return ret; | |
558 | } | |
559 | #endif | |
560 | ||
d8e4bb81 CH |
561 | /* set the logical block size */ |
562 | static int blkdev_bszset(struct block_device *bdev, fmode_t mode, | |
563 | int __user *argp) | |
564 | { | |
565 | int ret, n; | |
66ba32dc | 566 | |
d8e4bb81 CH |
567 | if (!capable(CAP_SYS_ADMIN)) |
568 | return -EACCES; | |
569 | if (!argp) | |
570 | return -EINVAL; | |
571 | if (get_user(n, argp)) | |
572 | return -EFAULT; | |
66ba32dc | 573 | |
d8e4bb81 CH |
574 | if (!(mode & FMODE_EXCL)) { |
575 | bdgrab(bdev); | |
576 | if (blkdev_get(bdev, mode | FMODE_EXCL, &bdev) < 0) | |
577 | return -EBUSY; | |
66ba32dc | 578 | } |
d30a2605 | 579 | |
d8e4bb81 CH |
580 | ret = set_blocksize(bdev, n); |
581 | if (!(mode & FMODE_EXCL)) | |
582 | blkdev_put(bdev, mode | FMODE_EXCL); | |
583 | return ret; | |
584 | } | |
a885c8c4 | 585 | |
d8e4bb81 | 586 | /* |
9b81648c AB |
587 | * Common commands that are handled the same way on native and compat |
588 | * user space. Note the separate arg/argp parameters that are needed | |
589 | * to deal with the compat_ptr() conversion. | |
d8e4bb81 | 590 | */ |
9b81648c AB |
591 | static int blkdev_common_ioctl(struct block_device *bdev, fmode_t mode, |
592 | unsigned cmd, unsigned long arg, void __user *argp) | |
d8e4bb81 | 593 | { |
d8e4bb81 CH |
594 | unsigned int max_sectors; |
595 | ||
596 | switch (cmd) { | |
597 | case BLKFLSBUF: | |
598 | return blkdev_flushbuf(bdev, mode, cmd, arg); | |
599 | case BLKROSET: | |
600 | return blkdev_roset(bdev, mode, cmd, arg); | |
601 | case BLKDISCARD: | |
602 | return blk_ioctl_discard(bdev, mode, arg, 0); | |
603 | case BLKSECDISCARD: | |
604 | return blk_ioctl_discard(bdev, mode, arg, | |
605 | BLKDEV_DISCARD_SECURE); | |
606 | case BLKZEROOUT: | |
607 | return blk_ioctl_zeroout(bdev, mode, arg); | |
3ed05a98 ST |
608 | case BLKREPORTZONE: |
609 | return blkdev_report_zones_ioctl(bdev, mode, cmd, arg); | |
610 | case BLKRESETZONE: | |
e876df1f AJ |
611 | case BLKOPENZONE: |
612 | case BLKCLOSEZONE: | |
613 | case BLKFINISHZONE: | |
614 | return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg); | |
72cd8757 | 615 | case BLKGETZONESZ: |
9b81648c | 616 | return put_uint(argp, bdev_zone_sectors(bdev)); |
65e4e3ee | 617 | case BLKGETNRZONES: |
9b81648c | 618 | return put_uint(argp, blkdev_nr_zones(bdev->bd_disk)); |
45048d09 | 619 | case BLKROGET: |
9b81648c | 620 | return put_int(argp, bdev_read_only(bdev) != 0); |
ac481c20 | 621 | case BLKSSZGET: /* get block device logical block size */ |
9b81648c | 622 | return put_int(argp, bdev_logical_block_size(bdev)); |
ac481c20 | 623 | case BLKPBSZGET: /* get block device physical block size */ |
9b81648c | 624 | return put_uint(argp, bdev_physical_block_size(bdev)); |
ac481c20 | 625 | case BLKIOMIN: |
9b81648c | 626 | return put_uint(argp, bdev_io_min(bdev)); |
ac481c20 | 627 | case BLKIOOPT: |
9b81648c | 628 | return put_uint(argp, bdev_io_opt(bdev)); |
ac481c20 | 629 | case BLKALIGNOFF: |
9b81648c | 630 | return put_int(argp, bdev_alignment_offset(bdev)); |
98262f27 | 631 | case BLKDISCARDZEROES: |
9b81648c | 632 | return put_uint(argp, 0); |
45048d09 | 633 | case BLKSECTGET: |
63f26496 AM |
634 | max_sectors = min_t(unsigned int, USHRT_MAX, |
635 | queue_max_sectors(bdev_get_queue(bdev))); | |
9b81648c | 636 | return put_ushort(argp, max_sectors); |
ef00f59c | 637 | case BLKROTATIONAL: |
9b81648c | 638 | return put_ushort(argp, !blk_queue_nonrot(bdev_get_queue(bdev))); |
45048d09 AV |
639 | case BLKRASET: |
640 | case BLKFRASET: | |
641 | if(!capable(CAP_SYS_ADMIN)) | |
642 | return -EACCES; | |
efa7c9f9 | 643 | bdev->bd_bdi->ra_pages = (arg * 512) / PAGE_SIZE; |
45048d09 | 644 | return 0; |
45048d09 | 645 | case BLKRRPART: |
d8e4bb81 | 646 | return blkdev_reread_part(bdev); |
45048d09 AV |
647 | case BLKTRACESTART: |
648 | case BLKTRACESTOP: | |
45048d09 | 649 | case BLKTRACETEARDOWN: |
d8e4bb81 | 650 | return blk_trace_ioctl(bdev, cmd, argp); |
bbd3e064 CH |
651 | case IOC_PR_REGISTER: |
652 | return blkdev_pr_register(bdev, argp); | |
653 | case IOC_PR_RESERVE: | |
654 | return blkdev_pr_reserve(bdev, argp); | |
655 | case IOC_PR_RELEASE: | |
656 | return blkdev_pr_release(bdev, argp); | |
657 | case IOC_PR_PREEMPT: | |
658 | return blkdev_pr_preempt(bdev, argp, false); | |
659 | case IOC_PR_PREEMPT_ABORT: | |
660 | return blkdev_pr_preempt(bdev, argp, true); | |
661 | case IOC_PR_CLEAR: | |
662 | return blkdev_pr_clear(bdev, argp); | |
45048d09 | 663 | default: |
9b81648c | 664 | return -ENOIOCTLCMD; |
45048d09 | 665 | } |
1da177e4 | 666 | } |
9b81648c AB |
667 | |
668 | /* | |
669 | * Always keep this in sync with compat_blkdev_ioctl() | |
670 | * to handle all incompatible commands in both functions. | |
671 | * | |
672 | * New commands must be compatible and go into blkdev_common_ioctl | |
673 | */ | |
674 | int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, | |
675 | unsigned long arg) | |
676 | { | |
677 | int ret; | |
678 | loff_t size; | |
679 | void __user *argp = (void __user *)arg; | |
680 | ||
681 | switch (cmd) { | |
682 | /* These need separate implementations for the data structure */ | |
683 | case HDIO_GETGEO: | |
684 | return blkdev_getgeo(bdev, argp); | |
685 | case BLKPG: | |
686 | return blkpg_ioctl(bdev, argp); | |
687 | ||
688 | /* Compat mode returns 32-bit data instead of 'long' */ | |
689 | case BLKRAGET: | |
690 | case BLKFRAGET: | |
691 | if (!argp) | |
692 | return -EINVAL; | |
693 | return put_long(argp, (bdev->bd_bdi->ra_pages*PAGE_SIZE) / 512); | |
694 | case BLKGETSIZE: | |
695 | size = i_size_read(bdev->bd_inode); | |
696 | if ((size >> 9) > ~0UL) | |
697 | return -EFBIG; | |
698 | return put_ulong(argp, size >> 9); | |
699 | ||
700 | /* The data is compatible, but the command number is different */ | |
701 | case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */ | |
702 | return put_int(argp, block_size(bdev)); | |
703 | case BLKBSZSET: | |
704 | return blkdev_bszset(bdev, mode, argp); | |
705 | case BLKGETSIZE64: | |
706 | return put_u64(argp, i_size_read(bdev->bd_inode)); | |
707 | ||
708 | /* Incompatible alignment on i386 */ | |
709 | case BLKTRACESETUP: | |
710 | return blk_trace_ioctl(bdev, cmd, argp); | |
711 | default: | |
712 | break; | |
713 | } | |
714 | ||
715 | ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp); | |
716 | if (ret == -ENOIOCTLCMD) | |
717 | return __blkdev_driver_ioctl(bdev, mode, cmd, arg); | |
718 | ||
719 | return ret; | |
720 | } | |
721 | EXPORT_SYMBOL_GPL(blkdev_ioctl); /* for /dev/raw */ | |
bdc1ddad AB |
722 | |
723 | #ifdef CONFIG_COMPAT | |
9b81648c | 724 | |
bdc1ddad AB |
725 | #define BLKBSZGET_32 _IOR(0x12, 112, int) |
726 | #define BLKBSZSET_32 _IOW(0x12, 113, int) | |
727 | #define BLKGETSIZE64_32 _IOR(0x12, 114, int) | |
728 | ||
729 | /* Most of the generic ioctls are handled in the normal fallback path. | |
730 | This assumes the blkdev's low level compat_ioctl always returns | |
731 | ENOIOCTLCMD for unknown ioctls. */ | |
732 | long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg) | |
733 | { | |
9b81648c AB |
734 | int ret; |
735 | void __user *argp = compat_ptr(arg); | |
bdc1ddad AB |
736 | struct inode *inode = file->f_mapping->host; |
737 | struct block_device *bdev = inode->i_bdev; | |
738 | struct gendisk *disk = bdev->bd_disk; | |
739 | fmode_t mode = file->f_mode; | |
740 | loff_t size; | |
bdc1ddad AB |
741 | |
742 | /* | |
743 | * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have | |
744 | * to updated it before every ioctl. | |
745 | */ | |
746 | if (file->f_flags & O_NDELAY) | |
747 | mode |= FMODE_NDELAY; | |
748 | else | |
749 | mode &= ~FMODE_NDELAY; | |
750 | ||
751 | switch (cmd) { | |
9b81648c | 752 | /* These need separate implementations for the data structure */ |
bdc1ddad | 753 | case HDIO_GETGEO: |
9b81648c | 754 | return compat_hdio_getgeo(bdev, argp); |
bdc1ddad | 755 | case BLKPG: |
9b81648c AB |
756 | return compat_blkpg_ioctl(bdev, argp); |
757 | ||
758 | /* Compat mode returns 32-bit data instead of 'long' */ | |
bdc1ddad AB |
759 | case BLKRAGET: |
760 | case BLKFRAGET: | |
9b81648c | 761 | if (!argp) |
bdc1ddad | 762 | return -EINVAL; |
9b81648c | 763 | return compat_put_long(argp, |
bdc1ddad | 764 | (bdev->bd_bdi->ra_pages * PAGE_SIZE) / 512); |
bdc1ddad AB |
765 | case BLKGETSIZE: |
766 | size = i_size_read(bdev->bd_inode); | |
767 | if ((size >> 9) > ~0UL) | |
768 | return -EFBIG; | |
9b81648c | 769 | return compat_put_ulong(argp, size >> 9); |
bdc1ddad | 770 | |
9b81648c AB |
771 | /* The data is compatible, but the command number is different */ |
772 | case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */ | |
773 | return put_int(argp, bdev_logical_block_size(bdev)); | |
774 | case BLKBSZSET_32: | |
775 | return blkdev_bszset(bdev, mode, argp); | |
bdc1ddad | 776 | case BLKGETSIZE64_32: |
9b81648c | 777 | return put_u64(argp, i_size_read(bdev->bd_inode)); |
bdc1ddad | 778 | |
9b81648c | 779 | /* Incompatible alignment on i386 */ |
bdc1ddad | 780 | case BLKTRACESETUP32: |
9b81648c | 781 | return blk_trace_ioctl(bdev, cmd, argp); |
bdc1ddad | 782 | default: |
9b81648c | 783 | break; |
bdc1ddad | 784 | } |
9b81648c AB |
785 | |
786 | ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp); | |
787 | if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl) | |
788 | ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg); | |
789 | ||
790 | return ret; | |
bdc1ddad AB |
791 | } |
792 | #endif |