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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> |
581e2600 | 14 | #include "blk.h" |
1da177e4 | 15 | |
5fb889f5 AB |
16 | static int blkpg_do_ioctl(struct block_device *bdev, |
17 | struct blkpg_partition __user *upart, int op) | |
1da177e4 LT |
18 | { |
19 | struct block_device *bdevp; | |
20 | struct gendisk *disk; | |
c83f6bf9 | 21 | struct hd_struct *part, *lpart; |
1da177e4 | 22 | struct blkpg_partition p; |
e71bf0d0 | 23 | struct disk_part_iter piter; |
1da177e4 | 24 | long long start, length; |
cf771cb5 | 25 | int partno; |
1da177e4 LT |
26 | |
27 | if (!capable(CAP_SYS_ADMIN)) | |
28 | return -EACCES; | |
5fb889f5 | 29 | if (copy_from_user(&p, upart, sizeof(struct blkpg_partition))) |
1da177e4 LT |
30 | return -EFAULT; |
31 | disk = bdev->bd_disk; | |
32 | if (bdev != bdev->bd_contains) | |
33 | return -EINVAL; | |
cf771cb5 | 34 | partno = p.pno; |
540eed56 | 35 | if (partno <= 0) |
1da177e4 | 36 | return -EINVAL; |
5fb889f5 | 37 | switch (op) { |
1da177e4 LT |
38 | case BLKPG_ADD_PARTITION: |
39 | start = p.start >> 9; | |
40 | length = p.length >> 9; | |
c83f6bf9 VG |
41 | /* check for fit in a hd_struct */ |
42 | if (sizeof(sector_t) == sizeof(long) && | |
1da177e4 LT |
43 | sizeof(long long) > sizeof(long)) { |
44 | long pstart = start, plength = length; | |
45 | if (pstart != start || plength != length | |
2bd6efad | 46 | || pstart < 0 || plength < 0 || partno > 65535) |
1da177e4 LT |
47 | return -EINVAL; |
48 | } | |
633395b6 SH |
49 | /* check if partition is aligned to blocksize */ |
50 | if (p.start & (bdev_logical_block_size(bdev) - 1)) | |
51 | return -EINVAL; | |
88e34126 | 52 | |
c039e313 | 53 | mutex_lock(&bdev->bd_mutex); |
88e34126 | 54 | |
1da177e4 | 55 | /* overlap? */ |
e71bf0d0 TH |
56 | disk_part_iter_init(&piter, disk, |
57 | DISK_PITER_INCL_EMPTY); | |
58 | while ((part = disk_part_iter_next(&piter))) { | |
59 | if (!(start + length <= part->start_sect || | |
60 | start >= part->start_sect + part->nr_sects)) { | |
61 | disk_part_iter_exit(&piter); | |
c039e313 | 62 | mutex_unlock(&bdev->bd_mutex); |
1da177e4 LT |
63 | return -EBUSY; |
64 | } | |
65 | } | |
e71bf0d0 TH |
66 | disk_part_iter_exit(&piter); |
67 | ||
1da177e4 | 68 | /* all seems OK */ |
ba32929a | 69 | part = add_partition(disk, partno, start, length, |
6d1d8050 | 70 | ADDPART_FLAG_NONE, NULL); |
c039e313 | 71 | mutex_unlock(&bdev->bd_mutex); |
c7d1ba41 | 72 | return PTR_ERR_OR_ZERO(part); |
1da177e4 | 73 | case BLKPG_DEL_PARTITION: |
e71bf0d0 TH |
74 | part = disk_get_part(disk, partno); |
75 | if (!part) | |
1da177e4 | 76 | return -ENXIO; |
e71bf0d0 TH |
77 | |
78 | bdevp = bdget(part_devt(part)); | |
79 | disk_put_part(part); | |
1da177e4 LT |
80 | if (!bdevp) |
81 | return -ENOMEM; | |
e71bf0d0 | 82 | |
2e7b651d | 83 | mutex_lock(&bdevp->bd_mutex); |
1da177e4 | 84 | if (bdevp->bd_openers) { |
c039e313 | 85 | mutex_unlock(&bdevp->bd_mutex); |
1da177e4 LT |
86 | bdput(bdevp); |
87 | return -EBUSY; | |
88 | } | |
89 | /* all seems OK */ | |
90 | fsync_bdev(bdevp); | |
f98393a6 | 91 | invalidate_bdev(bdevp); |
1da177e4 | 92 | |
6d740cd5 | 93 | mutex_lock_nested(&bdev->bd_mutex, 1); |
cf771cb5 | 94 | delete_partition(disk, partno); |
c039e313 AV |
95 | mutex_unlock(&bdev->bd_mutex); |
96 | mutex_unlock(&bdevp->bd_mutex); | |
1da177e4 LT |
97 | bdput(bdevp); |
98 | ||
c83f6bf9 VG |
99 | return 0; |
100 | case BLKPG_RESIZE_PARTITION: | |
101 | start = p.start >> 9; | |
102 | /* new length of partition in bytes */ | |
103 | length = p.length >> 9; | |
104 | /* check for fit in a hd_struct */ | |
105 | if (sizeof(sector_t) == sizeof(long) && | |
106 | sizeof(long long) > sizeof(long)) { | |
107 | long pstart = start, plength = length; | |
108 | if (pstart != start || plength != length | |
109 | || pstart < 0 || plength < 0) | |
110 | return -EINVAL; | |
111 | } | |
112 | part = disk_get_part(disk, partno); | |
113 | if (!part) | |
114 | return -ENXIO; | |
115 | bdevp = bdget(part_devt(part)); | |
116 | if (!bdevp) { | |
117 | disk_put_part(part); | |
118 | return -ENOMEM; | |
119 | } | |
120 | mutex_lock(&bdevp->bd_mutex); | |
121 | mutex_lock_nested(&bdev->bd_mutex, 1); | |
122 | if (start != part->start_sect) { | |
123 | mutex_unlock(&bdevp->bd_mutex); | |
124 | mutex_unlock(&bdev->bd_mutex); | |
125 | bdput(bdevp); | |
126 | disk_put_part(part); | |
127 | return -EINVAL; | |
128 | } | |
129 | /* overlap? */ | |
130 | disk_part_iter_init(&piter, disk, | |
131 | DISK_PITER_INCL_EMPTY); | |
132 | while ((lpart = disk_part_iter_next(&piter))) { | |
133 | if (lpart->partno != partno && | |
134 | !(start + length <= lpart->start_sect || | |
135 | start >= lpart->start_sect + lpart->nr_sects) | |
136 | ) { | |
137 | disk_part_iter_exit(&piter); | |
138 | mutex_unlock(&bdevp->bd_mutex); | |
139 | mutex_unlock(&bdev->bd_mutex); | |
140 | bdput(bdevp); | |
141 | disk_put_part(part); | |
142 | return -EBUSY; | |
143 | } | |
144 | } | |
145 | disk_part_iter_exit(&piter); | |
146 | part_nr_sects_write(part, (sector_t)length); | |
147 | i_size_write(bdevp->bd_inode, p.length); | |
148 | mutex_unlock(&bdevp->bd_mutex); | |
149 | mutex_unlock(&bdev->bd_mutex); | |
150 | bdput(bdevp); | |
151 | disk_put_part(part); | |
1da177e4 LT |
152 | return 0; |
153 | default: | |
154 | return -EINVAL; | |
155 | } | |
156 | } | |
157 | ||
5fb889f5 AB |
158 | static int blkpg_ioctl(struct block_device *bdev, |
159 | struct blkpg_ioctl_arg __user *arg) | |
160 | { | |
161 | struct blkpg_partition __user *udata; | |
162 | int op; | |
163 | ||
164 | if (get_user(op, &arg->op) || get_user(udata, &arg->data)) | |
165 | return -EFAULT; | |
166 | ||
167 | return blkpg_do_ioctl(bdev, udata, op); | |
168 | } | |
169 | ||
170 | #ifdef CONFIG_COMPAT | |
171 | struct compat_blkpg_ioctl_arg { | |
172 | compat_int_t op; | |
173 | compat_int_t flags; | |
174 | compat_int_t datalen; | |
175 | compat_caddr_t data; | |
176 | }; | |
177 | ||
178 | static int compat_blkpg_ioctl(struct block_device *bdev, | |
179 | struct compat_blkpg_ioctl_arg __user *arg) | |
180 | { | |
181 | compat_caddr_t udata; | |
182 | int op; | |
183 | ||
184 | if (get_user(op, &arg->op) || get_user(udata, &arg->data)) | |
185 | return -EFAULT; | |
186 | ||
187 | return blkpg_do_ioctl(bdev, compat_ptr(udata), op); | |
188 | } | |
189 | #endif | |
190 | ||
f0b870df | 191 | static int blkdev_reread_part(struct block_device *bdev) |
1da177e4 | 192 | { |
f0b870df CH |
193 | int ret; |
194 | ||
142fe8f4 | 195 | if (!disk_part_scan_enabled(bdev->bd_disk) || bdev != bdev->bd_contains) |
1da177e4 LT |
196 | return -EINVAL; |
197 | if (!capable(CAP_SYS_ADMIN)) | |
198 | return -EACCES; | |
be324177 | 199 | |
b04a5636 | 200 | mutex_lock(&bdev->bd_mutex); |
f0b870df | 201 | ret = bdev_disk_changed(bdev, false); |
c039e313 | 202 | mutex_unlock(&bdev->bd_mutex); |
be324177 | 203 | |
f0b870df | 204 | return ret; |
1da177e4 LT |
205 | } |
206 | ||
d8e4bb81 CH |
207 | static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode, |
208 | unsigned long arg, unsigned long flags) | |
d30a2605 | 209 | { |
d8e4bb81 CH |
210 | uint64_t range[2]; |
211 | uint64_t start, len; | |
351499a1 DM |
212 | struct request_queue *q = bdev_get_queue(bdev); |
213 | struct address_space *mapping = bdev->bd_inode->i_mapping; | |
214 | ||
d8e4bb81 CH |
215 | |
216 | if (!(mode & FMODE_WRITE)) | |
217 | return -EBADF; | |
218 | ||
351499a1 DM |
219 | if (!blk_queue_discard(q)) |
220 | return -EOPNOTSUPP; | |
221 | ||
d8e4bb81 CH |
222 | if (copy_from_user(range, (void __user *)arg, sizeof(range))) |
223 | return -EFAULT; | |
224 | ||
225 | start = range[0]; | |
226 | len = range[1]; | |
8d57a98c | 227 | |
d30a2605 DW |
228 | if (start & 511) |
229 | return -EINVAL; | |
230 | if (len & 511) | |
231 | return -EINVAL; | |
d30a2605 | 232 | |
351499a1 | 233 | if (start + len > i_size_read(bdev->bd_inode)) |
d30a2605 | 234 | return -EINVAL; |
0bd1ed48 | 235 | truncate_inode_pages_range(mapping, start, start + len - 1); |
351499a1 DM |
236 | return blkdev_issue_discard(bdev, start >> 9, len >> 9, |
237 | GFP_KERNEL, flags); | |
d30a2605 DW |
238 | } |
239 | ||
d8e4bb81 CH |
240 | static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode, |
241 | unsigned long arg) | |
66ba32dc | 242 | { |
d8e4bb81 | 243 | uint64_t range[2]; |
22dd6d35 DW |
244 | struct address_space *mapping; |
245 | uint64_t start, end, len; | |
d8e4bb81 CH |
246 | |
247 | if (!(mode & FMODE_WRITE)) | |
248 | return -EBADF; | |
249 | ||
250 | if (copy_from_user(range, (void __user *)arg, sizeof(range))) | |
251 | return -EFAULT; | |
252 | ||
253 | start = range[0]; | |
254 | len = range[1]; | |
22dd6d35 | 255 | end = start + len - 1; |
d8e4bb81 | 256 | |
66ba32dc MP |
257 | if (start & 511) |
258 | return -EINVAL; | |
259 | if (len & 511) | |
260 | return -EINVAL; | |
22dd6d35 DW |
261 | if (end >= (uint64_t)i_size_read(bdev->bd_inode)) |
262 | return -EINVAL; | |
263 | if (end < start) | |
66ba32dc MP |
264 | return -EINVAL; |
265 | ||
22dd6d35 DW |
266 | /* Invalidate the page cache, including dirty pages */ |
267 | mapping = bdev->bd_inode->i_mapping; | |
268 | truncate_inode_pages_range(mapping, start, end); | |
269 | ||
270 | return blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL, | |
ee472d83 | 271 | BLKDEV_ZERO_NOUNMAP); |
66ba32dc MP |
272 | } |
273 | ||
9b81648c | 274 | static int put_ushort(unsigned short __user *argp, unsigned short val) |
1da177e4 | 275 | { |
9b81648c | 276 | return put_user(val, argp); |
1da177e4 LT |
277 | } |
278 | ||
9b81648c | 279 | static int put_int(int __user *argp, int val) |
1da177e4 | 280 | { |
9b81648c | 281 | return put_user(val, argp); |
1da177e4 LT |
282 | } |
283 | ||
9b81648c | 284 | static int put_uint(unsigned int __user *argp, unsigned int val) |
ac481c20 | 285 | { |
9b81648c | 286 | return put_user(val, argp); |
ac481c20 MP |
287 | } |
288 | ||
9b81648c | 289 | static int put_long(long __user *argp, long val) |
1da177e4 | 290 | { |
9b81648c | 291 | return put_user(val, argp); |
1da177e4 LT |
292 | } |
293 | ||
9b81648c | 294 | static int put_ulong(unsigned long __user *argp, unsigned long val) |
1da177e4 | 295 | { |
9b81648c | 296 | return put_user(val, argp); |
1da177e4 LT |
297 | } |
298 | ||
9b81648c | 299 | static int put_u64(u64 __user *argp, u64 val) |
1da177e4 | 300 | { |
9b81648c | 301 | return put_user(val, argp); |
1da177e4 LT |
302 | } |
303 | ||
bdc1ddad | 304 | #ifdef CONFIG_COMPAT |
9b81648c | 305 | static int compat_put_long(compat_long_t *argp, long val) |
bdc1ddad | 306 | { |
9b81648c | 307 | return put_user(val, argp); |
bdc1ddad AB |
308 | } |
309 | ||
9b81648c | 310 | static int compat_put_ulong(compat_ulong_t *argp, compat_ulong_t val) |
bdc1ddad | 311 | { |
9b81648c | 312 | return put_user(val, argp); |
bdc1ddad AB |
313 | } |
314 | #endif | |
315 | ||
633a08b8 AV |
316 | int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode, |
317 | unsigned cmd, unsigned long arg) | |
318 | { | |
319 | struct gendisk *disk = bdev->bd_disk; | |
d4430d62 AV |
320 | |
321 | if (disk->fops->ioctl) | |
322 | return disk->fops->ioctl(bdev, mode, cmd, arg); | |
633a08b8 | 323 | |
633a08b8 AV |
324 | return -ENOTTY; |
325 | } | |
326 | /* | |
327 | * For the record: _GPL here is only because somebody decided to slap it | |
328 | * on the previous export. Sheer idiocy, since it wasn't copyrightable | |
329 | * at all and could be open-coded without any exports by anybody who cares. | |
330 | */ | |
331 | EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl); | |
332 | ||
ee6a129d AB |
333 | #ifdef CONFIG_COMPAT |
334 | /* | |
335 | * This is the equivalent of compat_ptr_ioctl(), to be used by block | |
336 | * drivers that implement only commands that are completely compatible | |
337 | * between 32-bit and 64-bit user space | |
338 | */ | |
339 | int blkdev_compat_ptr_ioctl(struct block_device *bdev, fmode_t mode, | |
340 | unsigned cmd, unsigned long arg) | |
341 | { | |
342 | struct gendisk *disk = bdev->bd_disk; | |
343 | ||
344 | if (disk->fops->ioctl) | |
345 | return disk->fops->ioctl(bdev, mode, cmd, | |
346 | (unsigned long)compat_ptr(arg)); | |
347 | ||
348 | return -ENOIOCTLCMD; | |
349 | } | |
350 | EXPORT_SYMBOL(blkdev_compat_ptr_ioctl); | |
351 | #endif | |
352 | ||
bbd3e064 CH |
353 | static int blkdev_pr_register(struct block_device *bdev, |
354 | struct pr_registration __user *arg) | |
355 | { | |
356 | const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; | |
357 | struct pr_registration reg; | |
358 | ||
359 | if (!capable(CAP_SYS_ADMIN)) | |
360 | return -EPERM; | |
361 | if (!ops || !ops->pr_register) | |
362 | return -EOPNOTSUPP; | |
363 | if (copy_from_user(®, arg, sizeof(reg))) | |
364 | return -EFAULT; | |
365 | ||
366 | if (reg.flags & ~PR_FL_IGNORE_KEY) | |
367 | return -EOPNOTSUPP; | |
368 | return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags); | |
369 | } | |
370 | ||
371 | static int blkdev_pr_reserve(struct block_device *bdev, | |
372 | struct pr_reservation __user *arg) | |
373 | { | |
374 | const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; | |
375 | struct pr_reservation rsv; | |
376 | ||
377 | if (!capable(CAP_SYS_ADMIN)) | |
378 | return -EPERM; | |
379 | if (!ops || !ops->pr_reserve) | |
380 | return -EOPNOTSUPP; | |
381 | if (copy_from_user(&rsv, arg, sizeof(rsv))) | |
382 | return -EFAULT; | |
383 | ||
384 | if (rsv.flags & ~PR_FL_IGNORE_KEY) | |
385 | return -EOPNOTSUPP; | |
386 | return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags); | |
387 | } | |
388 | ||
389 | static int blkdev_pr_release(struct block_device *bdev, | |
390 | struct pr_reservation __user *arg) | |
391 | { | |
392 | const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; | |
393 | struct pr_reservation rsv; | |
394 | ||
395 | if (!capable(CAP_SYS_ADMIN)) | |
396 | return -EPERM; | |
397 | if (!ops || !ops->pr_release) | |
398 | return -EOPNOTSUPP; | |
399 | if (copy_from_user(&rsv, arg, sizeof(rsv))) | |
400 | return -EFAULT; | |
401 | ||
402 | if (rsv.flags) | |
403 | return -EOPNOTSUPP; | |
404 | return ops->pr_release(bdev, rsv.key, rsv.type); | |
405 | } | |
406 | ||
407 | static int blkdev_pr_preempt(struct block_device *bdev, | |
408 | struct pr_preempt __user *arg, bool abort) | |
409 | { | |
410 | const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; | |
411 | struct pr_preempt p; | |
412 | ||
413 | if (!capable(CAP_SYS_ADMIN)) | |
414 | return -EPERM; | |
415 | if (!ops || !ops->pr_preempt) | |
416 | return -EOPNOTSUPP; | |
417 | if (copy_from_user(&p, arg, sizeof(p))) | |
418 | return -EFAULT; | |
419 | ||
420 | if (p.flags) | |
421 | return -EOPNOTSUPP; | |
422 | return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort); | |
423 | } | |
424 | ||
425 | static int blkdev_pr_clear(struct block_device *bdev, | |
426 | struct pr_clear __user *arg) | |
427 | { | |
428 | const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops; | |
429 | struct pr_clear c; | |
430 | ||
431 | if (!capable(CAP_SYS_ADMIN)) | |
432 | return -EPERM; | |
433 | if (!ops || !ops->pr_clear) | |
434 | return -EOPNOTSUPP; | |
435 | if (copy_from_user(&c, arg, sizeof(c))) | |
436 | return -EFAULT; | |
437 | ||
438 | if (c.flags) | |
439 | return -EOPNOTSUPP; | |
440 | return ops->pr_clear(bdev, c.key); | |
441 | } | |
442 | ||
07d106d0 LT |
443 | /* |
444 | * Is it an unrecognized ioctl? The correct returns are either | |
445 | * ENOTTY (final) or ENOIOCTLCMD ("I don't know this one, try a | |
446 | * fallback"). ENOIOCTLCMD gets turned into ENOTTY by the ioctl | |
447 | * code before returning. | |
448 | * | |
449 | * Confused drivers sometimes return EINVAL, which is wrong. It | |
450 | * means "I understood the ioctl command, but the parameters to | |
451 | * it were wrong". | |
452 | * | |
453 | * We should aim to just fix the broken drivers, the EINVAL case | |
454 | * should go away. | |
455 | */ | |
456 | static inline int is_unrecognized_ioctl(int ret) | |
457 | { | |
458 | return ret == -EINVAL || | |
459 | ret == -ENOTTY || | |
460 | ret == -ENOIOCTLCMD; | |
461 | } | |
462 | ||
d8e4bb81 CH |
463 | static int blkdev_flushbuf(struct block_device *bdev, fmode_t mode, |
464 | unsigned cmd, unsigned long arg) | |
bb93e3a5 | 465 | { |
d8e4bb81 | 466 | int ret; |
bb93e3a5 | 467 | |
d8e4bb81 CH |
468 | if (!capable(CAP_SYS_ADMIN)) |
469 | return -EACCES; | |
bb93e3a5 | 470 | |
d8e4bb81 CH |
471 | ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); |
472 | if (!is_unrecognized_ioctl(ret)) | |
473 | return ret; | |
bb93e3a5 | 474 | |
d8e4bb81 CH |
475 | fsync_bdev(bdev); |
476 | invalidate_bdev(bdev); | |
477 | return 0; | |
478 | } | |
d30a2605 | 479 | |
d8e4bb81 CH |
480 | static int blkdev_roset(struct block_device *bdev, fmode_t mode, |
481 | unsigned cmd, unsigned long arg) | |
482 | { | |
483 | int ret, n; | |
d30a2605 | 484 | |
bb749b31 ID |
485 | if (!capable(CAP_SYS_ADMIN)) |
486 | return -EACCES; | |
487 | ||
d8e4bb81 CH |
488 | ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); |
489 | if (!is_unrecognized_ioctl(ret)) | |
490 | return ret; | |
d8e4bb81 CH |
491 | if (get_user(n, (int __user *)arg)) |
492 | return -EFAULT; | |
493 | set_device_ro(bdev, n); | |
494 | return 0; | |
495 | } | |
d30a2605 | 496 | |
d8e4bb81 CH |
497 | static int blkdev_getgeo(struct block_device *bdev, |
498 | struct hd_geometry __user *argp) | |
499 | { | |
500 | struct gendisk *disk = bdev->bd_disk; | |
501 | struct hd_geometry geo; | |
502 | int ret; | |
d30a2605 | 503 | |
d8e4bb81 CH |
504 | if (!argp) |
505 | return -EINVAL; | |
506 | if (!disk->fops->getgeo) | |
507 | return -ENOTTY; | |
508 | ||
509 | /* | |
510 | * We need to set the startsect first, the driver may | |
511 | * want to override it. | |
512 | */ | |
513 | memset(&geo, 0, sizeof(geo)); | |
514 | geo.start = get_start_sect(bdev); | |
515 | ret = disk->fops->getgeo(bdev, &geo); | |
516 | if (ret) | |
517 | return ret; | |
518 | if (copy_to_user(argp, &geo, sizeof(geo))) | |
519 | return -EFAULT; | |
520 | return 0; | |
521 | } | |
66ba32dc | 522 | |
bdc1ddad AB |
523 | #ifdef CONFIG_COMPAT |
524 | struct compat_hd_geometry { | |
525 | unsigned char heads; | |
526 | unsigned char sectors; | |
527 | unsigned short cylinders; | |
528 | u32 start; | |
529 | }; | |
530 | ||
9b81648c AB |
531 | static int compat_hdio_getgeo(struct block_device *bdev, |
532 | struct compat_hd_geometry __user *ugeo) | |
bdc1ddad | 533 | { |
9b81648c | 534 | struct gendisk *disk = bdev->bd_disk; |
bdc1ddad AB |
535 | struct hd_geometry geo; |
536 | int ret; | |
537 | ||
538 | if (!ugeo) | |
539 | return -EINVAL; | |
540 | if (!disk->fops->getgeo) | |
541 | return -ENOTTY; | |
542 | ||
543 | memset(&geo, 0, sizeof(geo)); | |
544 | /* | |
545 | * We need to set the startsect first, the driver may | |
546 | * want to override it. | |
547 | */ | |
548 | geo.start = get_start_sect(bdev); | |
549 | ret = disk->fops->getgeo(bdev, &geo); | |
550 | if (ret) | |
551 | return ret; | |
552 | ||
553 | ret = copy_to_user(ugeo, &geo, 4); | |
554 | ret |= put_user(geo.start, &ugeo->start); | |
555 | if (ret) | |
556 | ret = -EFAULT; | |
557 | ||
558 | return ret; | |
559 | } | |
560 | #endif | |
561 | ||
d8e4bb81 CH |
562 | /* set the logical block size */ |
563 | static int blkdev_bszset(struct block_device *bdev, fmode_t mode, | |
564 | int __user *argp) | |
565 | { | |
566 | int ret, n; | |
66ba32dc | 567 | |
d8e4bb81 CH |
568 | if (!capable(CAP_SYS_ADMIN)) |
569 | return -EACCES; | |
570 | if (!argp) | |
571 | return -EINVAL; | |
572 | if (get_user(n, argp)) | |
573 | return -EFAULT; | |
66ba32dc | 574 | |
d8e4bb81 CH |
575 | if (!(mode & FMODE_EXCL)) { |
576 | bdgrab(bdev); | |
577 | if (blkdev_get(bdev, mode | FMODE_EXCL, &bdev) < 0) | |
578 | return -EBUSY; | |
66ba32dc | 579 | } |
d30a2605 | 580 | |
d8e4bb81 CH |
581 | ret = set_blocksize(bdev, n); |
582 | if (!(mode & FMODE_EXCL)) | |
583 | blkdev_put(bdev, mode | FMODE_EXCL); | |
584 | return ret; | |
585 | } | |
a885c8c4 | 586 | |
d8e4bb81 | 587 | /* |
9b81648c AB |
588 | * Common commands that are handled the same way on native and compat |
589 | * user space. Note the separate arg/argp parameters that are needed | |
590 | * to deal with the compat_ptr() conversion. | |
d8e4bb81 | 591 | */ |
9b81648c AB |
592 | static int blkdev_common_ioctl(struct block_device *bdev, fmode_t mode, |
593 | unsigned cmd, unsigned long arg, void __user *argp) | |
d8e4bb81 | 594 | { |
d8e4bb81 CH |
595 | unsigned int max_sectors; |
596 | ||
597 | switch (cmd) { | |
598 | case BLKFLSBUF: | |
599 | return blkdev_flushbuf(bdev, mode, cmd, arg); | |
600 | case BLKROSET: | |
601 | return blkdev_roset(bdev, mode, cmd, arg); | |
602 | case BLKDISCARD: | |
603 | return blk_ioctl_discard(bdev, mode, arg, 0); | |
604 | case BLKSECDISCARD: | |
605 | return blk_ioctl_discard(bdev, mode, arg, | |
606 | BLKDEV_DISCARD_SECURE); | |
607 | case BLKZEROOUT: | |
608 | return blk_ioctl_zeroout(bdev, mode, arg); | |
3ed05a98 ST |
609 | case BLKREPORTZONE: |
610 | return blkdev_report_zones_ioctl(bdev, mode, cmd, arg); | |
611 | case BLKRESETZONE: | |
e876df1f AJ |
612 | case BLKOPENZONE: |
613 | case BLKCLOSEZONE: | |
614 | case BLKFINISHZONE: | |
615 | return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg); | |
72cd8757 | 616 | case BLKGETZONESZ: |
9b81648c | 617 | return put_uint(argp, bdev_zone_sectors(bdev)); |
65e4e3ee | 618 | case BLKGETNRZONES: |
9b81648c | 619 | return put_uint(argp, blkdev_nr_zones(bdev->bd_disk)); |
45048d09 | 620 | case BLKROGET: |
9b81648c | 621 | return put_int(argp, bdev_read_only(bdev) != 0); |
ac481c20 | 622 | case BLKSSZGET: /* get block device logical block size */ |
9b81648c | 623 | return put_int(argp, bdev_logical_block_size(bdev)); |
ac481c20 | 624 | case BLKPBSZGET: /* get block device physical block size */ |
9b81648c | 625 | return put_uint(argp, bdev_physical_block_size(bdev)); |
ac481c20 | 626 | case BLKIOMIN: |
9b81648c | 627 | return put_uint(argp, bdev_io_min(bdev)); |
ac481c20 | 628 | case BLKIOOPT: |
9b81648c | 629 | return put_uint(argp, bdev_io_opt(bdev)); |
ac481c20 | 630 | case BLKALIGNOFF: |
9b81648c | 631 | return put_int(argp, bdev_alignment_offset(bdev)); |
98262f27 | 632 | case BLKDISCARDZEROES: |
9b81648c | 633 | return put_uint(argp, 0); |
45048d09 | 634 | case BLKSECTGET: |
63f26496 AM |
635 | max_sectors = min_t(unsigned int, USHRT_MAX, |
636 | queue_max_sectors(bdev_get_queue(bdev))); | |
9b81648c | 637 | return put_ushort(argp, max_sectors); |
ef00f59c | 638 | case BLKROTATIONAL: |
9b81648c | 639 | return put_ushort(argp, !blk_queue_nonrot(bdev_get_queue(bdev))); |
45048d09 AV |
640 | case BLKRASET: |
641 | case BLKFRASET: | |
642 | if(!capable(CAP_SYS_ADMIN)) | |
643 | return -EACCES; | |
efa7c9f9 | 644 | bdev->bd_bdi->ra_pages = (arg * 512) / PAGE_SIZE; |
45048d09 | 645 | return 0; |
45048d09 | 646 | case BLKRRPART: |
d8e4bb81 | 647 | return blkdev_reread_part(bdev); |
45048d09 AV |
648 | case BLKTRACESTART: |
649 | case BLKTRACESTOP: | |
45048d09 | 650 | case BLKTRACETEARDOWN: |
d8e4bb81 | 651 | return blk_trace_ioctl(bdev, cmd, argp); |
bbd3e064 CH |
652 | case IOC_PR_REGISTER: |
653 | return blkdev_pr_register(bdev, argp); | |
654 | case IOC_PR_RESERVE: | |
655 | return blkdev_pr_reserve(bdev, argp); | |
656 | case IOC_PR_RELEASE: | |
657 | return blkdev_pr_release(bdev, argp); | |
658 | case IOC_PR_PREEMPT: | |
659 | return blkdev_pr_preempt(bdev, argp, false); | |
660 | case IOC_PR_PREEMPT_ABORT: | |
661 | return blkdev_pr_preempt(bdev, argp, true); | |
662 | case IOC_PR_CLEAR: | |
663 | return blkdev_pr_clear(bdev, argp); | |
45048d09 | 664 | default: |
9b81648c | 665 | return -ENOIOCTLCMD; |
45048d09 | 666 | } |
1da177e4 | 667 | } |
9b81648c AB |
668 | |
669 | /* | |
670 | * Always keep this in sync with compat_blkdev_ioctl() | |
671 | * to handle all incompatible commands in both functions. | |
672 | * | |
673 | * New commands must be compatible and go into blkdev_common_ioctl | |
674 | */ | |
675 | int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, | |
676 | unsigned long arg) | |
677 | { | |
678 | int ret; | |
679 | loff_t size; | |
680 | void __user *argp = (void __user *)arg; | |
681 | ||
682 | switch (cmd) { | |
683 | /* These need separate implementations for the data structure */ | |
684 | case HDIO_GETGEO: | |
685 | return blkdev_getgeo(bdev, argp); | |
686 | case BLKPG: | |
687 | return blkpg_ioctl(bdev, argp); | |
688 | ||
689 | /* Compat mode returns 32-bit data instead of 'long' */ | |
690 | case BLKRAGET: | |
691 | case BLKFRAGET: | |
692 | if (!argp) | |
693 | return -EINVAL; | |
694 | return put_long(argp, (bdev->bd_bdi->ra_pages*PAGE_SIZE) / 512); | |
695 | case BLKGETSIZE: | |
696 | size = i_size_read(bdev->bd_inode); | |
697 | if ((size >> 9) > ~0UL) | |
698 | return -EFBIG; | |
699 | return put_ulong(argp, size >> 9); | |
700 | ||
701 | /* The data is compatible, but the command number is different */ | |
702 | case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */ | |
703 | return put_int(argp, block_size(bdev)); | |
704 | case BLKBSZSET: | |
705 | return blkdev_bszset(bdev, mode, argp); | |
706 | case BLKGETSIZE64: | |
707 | return put_u64(argp, i_size_read(bdev->bd_inode)); | |
708 | ||
709 | /* Incompatible alignment on i386 */ | |
710 | case BLKTRACESETUP: | |
711 | return blk_trace_ioctl(bdev, cmd, argp); | |
712 | default: | |
713 | break; | |
714 | } | |
715 | ||
716 | ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp); | |
717 | if (ret == -ENOIOCTLCMD) | |
718 | return __blkdev_driver_ioctl(bdev, mode, cmd, arg); | |
719 | ||
720 | return ret; | |
721 | } | |
722 | EXPORT_SYMBOL_GPL(blkdev_ioctl); /* for /dev/raw */ | |
bdc1ddad AB |
723 | |
724 | #ifdef CONFIG_COMPAT | |
9b81648c | 725 | |
bdc1ddad AB |
726 | #define BLKBSZGET_32 _IOR(0x12, 112, int) |
727 | #define BLKBSZSET_32 _IOW(0x12, 113, int) | |
728 | #define BLKGETSIZE64_32 _IOR(0x12, 114, int) | |
729 | ||
730 | /* Most of the generic ioctls are handled in the normal fallback path. | |
731 | This assumes the blkdev's low level compat_ioctl always returns | |
732 | ENOIOCTLCMD for unknown ioctls. */ | |
733 | long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg) | |
734 | { | |
9b81648c AB |
735 | int ret; |
736 | void __user *argp = compat_ptr(arg); | |
bdc1ddad AB |
737 | struct inode *inode = file->f_mapping->host; |
738 | struct block_device *bdev = inode->i_bdev; | |
739 | struct gendisk *disk = bdev->bd_disk; | |
740 | fmode_t mode = file->f_mode; | |
741 | loff_t size; | |
bdc1ddad AB |
742 | |
743 | /* | |
744 | * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have | |
745 | * to updated it before every ioctl. | |
746 | */ | |
747 | if (file->f_flags & O_NDELAY) | |
748 | mode |= FMODE_NDELAY; | |
749 | else | |
750 | mode &= ~FMODE_NDELAY; | |
751 | ||
752 | switch (cmd) { | |
9b81648c | 753 | /* These need separate implementations for the data structure */ |
bdc1ddad | 754 | case HDIO_GETGEO: |
9b81648c | 755 | return compat_hdio_getgeo(bdev, argp); |
bdc1ddad | 756 | case BLKPG: |
9b81648c AB |
757 | return compat_blkpg_ioctl(bdev, argp); |
758 | ||
759 | /* Compat mode returns 32-bit data instead of 'long' */ | |
bdc1ddad AB |
760 | case BLKRAGET: |
761 | case BLKFRAGET: | |
9b81648c | 762 | if (!argp) |
bdc1ddad | 763 | return -EINVAL; |
9b81648c | 764 | return compat_put_long(argp, |
bdc1ddad | 765 | (bdev->bd_bdi->ra_pages * PAGE_SIZE) / 512); |
bdc1ddad AB |
766 | case BLKGETSIZE: |
767 | size = i_size_read(bdev->bd_inode); | |
768 | if ((size >> 9) > ~0UL) | |
769 | return -EFBIG; | |
9b81648c | 770 | return compat_put_ulong(argp, size >> 9); |
bdc1ddad | 771 | |
9b81648c AB |
772 | /* The data is compatible, but the command number is different */ |
773 | case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */ | |
774 | return put_int(argp, bdev_logical_block_size(bdev)); | |
775 | case BLKBSZSET_32: | |
776 | return blkdev_bszset(bdev, mode, argp); | |
bdc1ddad | 777 | case BLKGETSIZE64_32: |
9b81648c | 778 | return put_u64(argp, i_size_read(bdev->bd_inode)); |
bdc1ddad | 779 | |
9b81648c | 780 | /* Incompatible alignment on i386 */ |
bdc1ddad | 781 | case BLKTRACESETUP32: |
9b81648c | 782 | return blk_trace_ioctl(bdev, cmd, argp); |
bdc1ddad | 783 | default: |
9b81648c | 784 | break; |
bdc1ddad | 785 | } |
9b81648c AB |
786 | |
787 | ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp); | |
788 | if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl) | |
789 | ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg); | |
790 | ||
791 | return ret; | |
bdc1ddad AB |
792 | } |
793 | #endif |