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1#include <linux/capability.h>
2#include <linux/blkdev.h>
3#include <linux/export.h>
4#include <linux/gfp.h>
5#include <linux/blkpg.h>
6#include <linux/hdreg.h>
7#include <linux/backing-dev.h>
8#include <linux/fs.h>
9#include <linux/blktrace_api.h>
10#include <asm/uaccess.h>
11
12static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user *arg)
13{
14 struct block_device *bdevp;
15 struct gendisk *disk;
16 struct hd_struct *part, *lpart;
17 struct blkpg_ioctl_arg a;
18 struct blkpg_partition p;
19 struct disk_part_iter piter;
20 long long start, length;
21 int partno;
22
23 if (!capable(CAP_SYS_ADMIN))
24 return -EACCES;
25 if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg)))
26 return -EFAULT;
27 if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition)))
28 return -EFAULT;
29 disk = bdev->bd_disk;
30 if (bdev != bdev->bd_contains)
31 return -EINVAL;
32 partno = p.pno;
33 if (partno <= 0)
34 return -EINVAL;
35 switch (a.op) {
36 case BLKPG_ADD_PARTITION:
37 start = p.start >> 9;
38 length = p.length >> 9;
39 /* check for fit in a hd_struct */
40 if (sizeof(sector_t) == sizeof(long) &&
41 sizeof(long long) > sizeof(long)) {
42 long pstart = start, plength = length;
43 if (pstart != start || plength != length
44 || pstart < 0 || plength < 0 || partno > 65535)
45 return -EINVAL;
46 }
47
48 mutex_lock(&bdev->bd_mutex);
49
50 /* overlap? */
51 disk_part_iter_init(&piter, disk,
52 DISK_PITER_INCL_EMPTY);
53 while ((part = disk_part_iter_next(&piter))) {
54 if (!(start + length <= part->start_sect ||
55 start >= part->start_sect + part->nr_sects)) {
56 disk_part_iter_exit(&piter);
57 mutex_unlock(&bdev->bd_mutex);
58 return -EBUSY;
59 }
60 }
61 disk_part_iter_exit(&piter);
62
63 /* all seems OK */
64 part = add_partition(disk, partno, start, length,
65 ADDPART_FLAG_NONE, NULL);
66 mutex_unlock(&bdev->bd_mutex);
67 return PTR_ERR_OR_ZERO(part);
68 case BLKPG_DEL_PARTITION:
69 part = disk_get_part(disk, partno);
70 if (!part)
71 return -ENXIO;
72
73 bdevp = bdget(part_devt(part));
74 disk_put_part(part);
75 if (!bdevp)
76 return -ENOMEM;
77
78 mutex_lock(&bdevp->bd_mutex);
79 if (bdevp->bd_openers) {
80 mutex_unlock(&bdevp->bd_mutex);
81 bdput(bdevp);
82 return -EBUSY;
83 }
84 /* all seems OK */
85 fsync_bdev(bdevp);
86 invalidate_bdev(bdevp);
87
88 mutex_lock_nested(&bdev->bd_mutex, 1);
89 delete_partition(disk, partno);
90 mutex_unlock(&bdev->bd_mutex);
91 mutex_unlock(&bdevp->bd_mutex);
92 bdput(bdevp);
93
94 return 0;
95 case BLKPG_RESIZE_PARTITION:
96 start = p.start >> 9;
97 /* new length of partition in bytes */
98 length = p.length >> 9;
99 /* check for fit in a hd_struct */
100 if (sizeof(sector_t) == sizeof(long) &&
101 sizeof(long long) > sizeof(long)) {
102 long pstart = start, plength = length;
103 if (pstart != start || plength != length
104 || pstart < 0 || plength < 0)
105 return -EINVAL;
106 }
107 part = disk_get_part(disk, partno);
108 if (!part)
109 return -ENXIO;
110 bdevp = bdget(part_devt(part));
111 if (!bdevp) {
112 disk_put_part(part);
113 return -ENOMEM;
114 }
115 mutex_lock(&bdevp->bd_mutex);
116 mutex_lock_nested(&bdev->bd_mutex, 1);
117 if (start != part->start_sect) {
118 mutex_unlock(&bdevp->bd_mutex);
119 mutex_unlock(&bdev->bd_mutex);
120 bdput(bdevp);
121 disk_put_part(part);
122 return -EINVAL;
123 }
124 /* overlap? */
125 disk_part_iter_init(&piter, disk,
126 DISK_PITER_INCL_EMPTY);
127 while ((lpart = disk_part_iter_next(&piter))) {
128 if (lpart->partno != partno &&
129 !(start + length <= lpart->start_sect ||
130 start >= lpart->start_sect + lpart->nr_sects)
131 ) {
132 disk_part_iter_exit(&piter);
133 mutex_unlock(&bdevp->bd_mutex);
134 mutex_unlock(&bdev->bd_mutex);
135 bdput(bdevp);
136 disk_put_part(part);
137 return -EBUSY;
138 }
139 }
140 disk_part_iter_exit(&piter);
141 part_nr_sects_write(part, (sector_t)length);
142 i_size_write(bdevp->bd_inode, p.length);
143 mutex_unlock(&bdevp->bd_mutex);
144 mutex_unlock(&bdev->bd_mutex);
145 bdput(bdevp);
146 disk_put_part(part);
147 return 0;
148 default:
149 return -EINVAL;
150 }
151}
152
153static int blkdev_reread_part(struct block_device *bdev)
154{
155 struct gendisk *disk = bdev->bd_disk;
156 int res;
157
158 if (!disk_part_scan_enabled(disk) || bdev != bdev->bd_contains)
159 return -EINVAL;
160 if (!capable(CAP_SYS_ADMIN))
161 return -EACCES;
162 if (!mutex_trylock(&bdev->bd_mutex))
163 return -EBUSY;
164 res = rescan_partitions(disk, bdev);
165 mutex_unlock(&bdev->bd_mutex);
166 return res;
167}
168
169static int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
170 uint64_t len, int secure)
171{
172 unsigned long flags = 0;
173
174 if (start & 511)
175 return -EINVAL;
176 if (len & 511)
177 return -EINVAL;
178 start >>= 9;
179 len >>= 9;
180
181 if (start + len > (i_size_read(bdev->bd_inode) >> 9))
182 return -EINVAL;
183 if (secure)
184 flags |= BLKDEV_DISCARD_SECURE;
185 return blkdev_issue_discard(bdev, start, len, GFP_KERNEL, flags);
186}
187
188static int blk_ioctl_zeroout(struct block_device *bdev, uint64_t start,
189 uint64_t len)
190{
191 if (start & 511)
192 return -EINVAL;
193 if (len & 511)
194 return -EINVAL;
195 start >>= 9;
196 len >>= 9;
197
198 if (start + len > (i_size_read(bdev->bd_inode) >> 9))
199 return -EINVAL;
200
201 return blkdev_issue_zeroout(bdev, start, len, GFP_KERNEL);
202}
203
204static int put_ushort(unsigned long arg, unsigned short val)
205{
206 return put_user(val, (unsigned short __user *)arg);
207}
208
209static int put_int(unsigned long arg, int val)
210{
211 return put_user(val, (int __user *)arg);
212}
213
214static int put_uint(unsigned long arg, unsigned int val)
215{
216 return put_user(val, (unsigned int __user *)arg);
217}
218
219static int put_long(unsigned long arg, long val)
220{
221 return put_user(val, (long __user *)arg);
222}
223
224static int put_ulong(unsigned long arg, unsigned long val)
225{
226 return put_user(val, (unsigned long __user *)arg);
227}
228
229static int put_u64(unsigned long arg, u64 val)
230{
231 return put_user(val, (u64 __user *)arg);
232}
233
234int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
235 unsigned cmd, unsigned long arg)
236{
237 struct gendisk *disk = bdev->bd_disk;
238
239 if (disk->fops->ioctl)
240 return disk->fops->ioctl(bdev, mode, cmd, arg);
241
242 return -ENOTTY;
243}
244/*
245 * For the record: _GPL here is only because somebody decided to slap it
246 * on the previous export. Sheer idiocy, since it wasn't copyrightable
247 * at all and could be open-coded without any exports by anybody who cares.
248 */
249EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl);
250
251/*
252 * Is it an unrecognized ioctl? The correct returns are either
253 * ENOTTY (final) or ENOIOCTLCMD ("I don't know this one, try a
254 * fallback"). ENOIOCTLCMD gets turned into ENOTTY by the ioctl
255 * code before returning.
256 *
257 * Confused drivers sometimes return EINVAL, which is wrong. It
258 * means "I understood the ioctl command, but the parameters to
259 * it were wrong".
260 *
261 * We should aim to just fix the broken drivers, the EINVAL case
262 * should go away.
263 */
264static inline int is_unrecognized_ioctl(int ret)
265{
266 return ret == -EINVAL ||
267 ret == -ENOTTY ||
268 ret == -ENOIOCTLCMD;
269}
270
271/*
272 * always keep this in sync with compat_blkdev_ioctl()
273 */
274int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
275 unsigned long arg)
276{
277 struct gendisk *disk = bdev->bd_disk;
278 struct backing_dev_info *bdi;
279 loff_t size;
280 int ret, n;
281
282 switch(cmd) {
283 case BLKFLSBUF:
284 if (!capable(CAP_SYS_ADMIN))
285 return -EACCES;
286
287 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
288 if (!is_unrecognized_ioctl(ret))
289 return ret;
290
291 fsync_bdev(bdev);
292 invalidate_bdev(bdev);
293 return 0;
294
295 case BLKROSET:
296 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
297 if (!is_unrecognized_ioctl(ret))
298 return ret;
299 if (!capable(CAP_SYS_ADMIN))
300 return -EACCES;
301 if (get_user(n, (int __user *)(arg)))
302 return -EFAULT;
303 set_device_ro(bdev, n);
304 return 0;
305
306 case BLKDISCARD:
307 case BLKSECDISCARD: {
308 uint64_t range[2];
309
310 if (!(mode & FMODE_WRITE))
311 return -EBADF;
312
313 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
314 return -EFAULT;
315
316 return blk_ioctl_discard(bdev, range[0], range[1],
317 cmd == BLKSECDISCARD);
318 }
319 case BLKZEROOUT: {
320 uint64_t range[2];
321
322 if (!(mode & FMODE_WRITE))
323 return -EBADF;
324
325 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
326 return -EFAULT;
327
328 return blk_ioctl_zeroout(bdev, range[0], range[1]);
329 }
330
331 case HDIO_GETGEO: {
332 struct hd_geometry geo;
333
334 if (!arg)
335 return -EINVAL;
336 if (!disk->fops->getgeo)
337 return -ENOTTY;
338
339 /*
340 * We need to set the startsect first, the driver may
341 * want to override it.
342 */
343 memset(&geo, 0, sizeof(geo));
344 geo.start = get_start_sect(bdev);
345 ret = disk->fops->getgeo(bdev, &geo);
346 if (ret)
347 return ret;
348 if (copy_to_user((struct hd_geometry __user *)arg, &geo,
349 sizeof(geo)))
350 return -EFAULT;
351 return 0;
352 }
353 case BLKRAGET:
354 case BLKFRAGET:
355 if (!arg)
356 return -EINVAL;
357 bdi = blk_get_backing_dev_info(bdev);
358 if (bdi == NULL)
359 return -ENOTTY;
360 return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
361 case BLKROGET:
362 return put_int(arg, bdev_read_only(bdev) != 0);
363 case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
364 return put_int(arg, block_size(bdev));
365 case BLKSSZGET: /* get block device logical block size */
366 return put_int(arg, bdev_logical_block_size(bdev));
367 case BLKPBSZGET: /* get block device physical block size */
368 return put_uint(arg, bdev_physical_block_size(bdev));
369 case BLKIOMIN:
370 return put_uint(arg, bdev_io_min(bdev));
371 case BLKIOOPT:
372 return put_uint(arg, bdev_io_opt(bdev));
373 case BLKALIGNOFF:
374 return put_int(arg, bdev_alignment_offset(bdev));
375 case BLKDISCARDZEROES:
376 return put_uint(arg, bdev_discard_zeroes_data(bdev));
377 case BLKSECTGET:
378 return put_ushort(arg, queue_max_sectors(bdev_get_queue(bdev)));
379 case BLKROTATIONAL:
380 return put_ushort(arg, !blk_queue_nonrot(bdev_get_queue(bdev)));
381 case BLKRASET:
382 case BLKFRASET:
383 if(!capable(CAP_SYS_ADMIN))
384 return -EACCES;
385 bdi = blk_get_backing_dev_info(bdev);
386 if (bdi == NULL)
387 return -ENOTTY;
388 bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
389 return 0;
390 case BLKBSZSET:
391 /* set the logical block size */
392 if (!capable(CAP_SYS_ADMIN))
393 return -EACCES;
394 if (!arg)
395 return -EINVAL;
396 if (get_user(n, (int __user *) arg))
397 return -EFAULT;
398 if (!(mode & FMODE_EXCL)) {
399 bdgrab(bdev);
400 if (blkdev_get(bdev, mode | FMODE_EXCL, &bdev) < 0)
401 return -EBUSY;
402 }
403 ret = set_blocksize(bdev, n);
404 if (!(mode & FMODE_EXCL))
405 blkdev_put(bdev, mode | FMODE_EXCL);
406 return ret;
407 case BLKPG:
408 ret = blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
409 break;
410 case BLKRRPART:
411 ret = blkdev_reread_part(bdev);
412 break;
413 case BLKGETSIZE:
414 size = i_size_read(bdev->bd_inode);
415 if ((size >> 9) > ~0UL)
416 return -EFBIG;
417 return put_ulong(arg, size >> 9);
418 case BLKGETSIZE64:
419 return put_u64(arg, i_size_read(bdev->bd_inode));
420 case BLKTRACESTART:
421 case BLKTRACESTOP:
422 case BLKTRACESETUP:
423 case BLKTRACETEARDOWN:
424 ret = blk_trace_ioctl(bdev, cmd, (char __user *) arg);
425 break;
426 default:
427 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
428 }
429 return ret;
430}
431EXPORT_SYMBOL_GPL(blkdev_ioctl);
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
16static int blkpg_do_ioctl(struct block_device *bdev,
17 struct blkpg_partition __user *upart, int op)
18{
19 struct blkpg_partition p;
20 long long start, length;
21
22 if (!capable(CAP_SYS_ADMIN))
23 return -EACCES;
24 if (copy_from_user(&p, upart, sizeof(struct blkpg_partition)))
25 return -EFAULT;
26 if (bdev != bdev->bd_contains)
27 return -EINVAL;
28
29 if (p.pno <= 0)
30 return -EINVAL;
31
32 if (op == BLKPG_DEL_PARTITION)
33 return bdev_del_partition(bdev, p.pno);
34
35 start = p.start >> SECTOR_SHIFT;
36 length = p.length >> SECTOR_SHIFT;
37
38 /* check for fit in a hd_struct */
39 if (sizeof(sector_t) < sizeof(long long)) {
40 long pstart = start, plength = length;
41
42 if (pstart != start || plength != length || pstart < 0 ||
43 plength < 0 || p.pno > 65535)
44 return -EINVAL;
45 }
46
47 switch (op) {
48 case BLKPG_ADD_PARTITION:
49 /* check if partition is aligned to blocksize */
50 if (p.start & (bdev_logical_block_size(bdev) - 1))
51 return -EINVAL;
52 return bdev_add_partition(bdev, p.pno, start, length);
53 case BLKPG_RESIZE_PARTITION:
54 return bdev_resize_partition(bdev, p.pno, start, length);
55 default:
56 return -EINVAL;
57 }
58}
59
60static int blkpg_ioctl(struct block_device *bdev,
61 struct blkpg_ioctl_arg __user *arg)
62{
63 struct blkpg_partition __user *udata;
64 int op;
65
66 if (get_user(op, &arg->op) || get_user(udata, &arg->data))
67 return -EFAULT;
68
69 return blkpg_do_ioctl(bdev, udata, op);
70}
71
72#ifdef CONFIG_COMPAT
73struct compat_blkpg_ioctl_arg {
74 compat_int_t op;
75 compat_int_t flags;
76 compat_int_t datalen;
77 compat_caddr_t data;
78};
79
80static int compat_blkpg_ioctl(struct block_device *bdev,
81 struct compat_blkpg_ioctl_arg __user *arg)
82{
83 compat_caddr_t udata;
84 int op;
85
86 if (get_user(op, &arg->op) || get_user(udata, &arg->data))
87 return -EFAULT;
88
89 return blkpg_do_ioctl(bdev, compat_ptr(udata), op);
90}
91#endif
92
93static int blkdev_reread_part(struct block_device *bdev)
94{
95 int ret;
96
97 if (!disk_part_scan_enabled(bdev->bd_disk) || bdev != bdev->bd_contains)
98 return -EINVAL;
99 if (!capable(CAP_SYS_ADMIN))
100 return -EACCES;
101
102 mutex_lock(&bdev->bd_mutex);
103 ret = bdev_disk_changed(bdev, false);
104 mutex_unlock(&bdev->bd_mutex);
105
106 return ret;
107}
108
109static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode,
110 unsigned long arg, unsigned long flags)
111{
112 uint64_t range[2];
113 uint64_t start, len;
114 struct request_queue *q = bdev_get_queue(bdev);
115 struct address_space *mapping = bdev->bd_inode->i_mapping;
116
117
118 if (!(mode & FMODE_WRITE))
119 return -EBADF;
120
121 if (!blk_queue_discard(q))
122 return -EOPNOTSUPP;
123
124 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
125 return -EFAULT;
126
127 start = range[0];
128 len = range[1];
129
130 if (start & 511)
131 return -EINVAL;
132 if (len & 511)
133 return -EINVAL;
134
135 if (start + len > i_size_read(bdev->bd_inode))
136 return -EINVAL;
137 truncate_inode_pages_range(mapping, start, start + len - 1);
138 return blkdev_issue_discard(bdev, start >> 9, len >> 9,
139 GFP_KERNEL, flags);
140}
141
142static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode,
143 unsigned long arg)
144{
145 uint64_t range[2];
146 struct address_space *mapping;
147 uint64_t start, end, len;
148
149 if (!(mode & FMODE_WRITE))
150 return -EBADF;
151
152 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
153 return -EFAULT;
154
155 start = range[0];
156 len = range[1];
157 end = start + len - 1;
158
159 if (start & 511)
160 return -EINVAL;
161 if (len & 511)
162 return -EINVAL;
163 if (end >= (uint64_t)i_size_read(bdev->bd_inode))
164 return -EINVAL;
165 if (end < start)
166 return -EINVAL;
167
168 /* Invalidate the page cache, including dirty pages */
169 mapping = bdev->bd_inode->i_mapping;
170 truncate_inode_pages_range(mapping, start, end);
171
172 return blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL,
173 BLKDEV_ZERO_NOUNMAP);
174}
175
176static int put_ushort(unsigned short __user *argp, unsigned short val)
177{
178 return put_user(val, argp);
179}
180
181static int put_int(int __user *argp, int val)
182{
183 return put_user(val, argp);
184}
185
186static int put_uint(unsigned int __user *argp, unsigned int val)
187{
188 return put_user(val, argp);
189}
190
191static int put_long(long __user *argp, long val)
192{
193 return put_user(val, argp);
194}
195
196static int put_ulong(unsigned long __user *argp, unsigned long val)
197{
198 return put_user(val, argp);
199}
200
201static int put_u64(u64 __user *argp, u64 val)
202{
203 return put_user(val, argp);
204}
205
206#ifdef CONFIG_COMPAT
207static int compat_put_long(compat_long_t __user *argp, long val)
208{
209 return put_user(val, argp);
210}
211
212static int compat_put_ulong(compat_ulong_t __user *argp, compat_ulong_t val)
213{
214 return put_user(val, argp);
215}
216#endif
217
218int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
219 unsigned cmd, unsigned long arg)
220{
221 struct gendisk *disk = bdev->bd_disk;
222
223 if (disk->fops->ioctl)
224 return disk->fops->ioctl(bdev, mode, cmd, arg);
225
226 return -ENOTTY;
227}
228/*
229 * For the record: _GPL here is only because somebody decided to slap it
230 * on the previous export. Sheer idiocy, since it wasn't copyrightable
231 * at all and could be open-coded without any exports by anybody who cares.
232 */
233EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl);
234
235#ifdef CONFIG_COMPAT
236/*
237 * This is the equivalent of compat_ptr_ioctl(), to be used by block
238 * drivers that implement only commands that are completely compatible
239 * between 32-bit and 64-bit user space
240 */
241int blkdev_compat_ptr_ioctl(struct block_device *bdev, fmode_t mode,
242 unsigned cmd, unsigned long arg)
243{
244 struct gendisk *disk = bdev->bd_disk;
245
246 if (disk->fops->ioctl)
247 return disk->fops->ioctl(bdev, mode, cmd,
248 (unsigned long)compat_ptr(arg));
249
250 return -ENOIOCTLCMD;
251}
252EXPORT_SYMBOL(blkdev_compat_ptr_ioctl);
253#endif
254
255static int blkdev_pr_register(struct block_device *bdev,
256 struct pr_registration __user *arg)
257{
258 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
259 struct pr_registration reg;
260
261 if (!capable(CAP_SYS_ADMIN))
262 return -EPERM;
263 if (!ops || !ops->pr_register)
264 return -EOPNOTSUPP;
265 if (copy_from_user(®, arg, sizeof(reg)))
266 return -EFAULT;
267
268 if (reg.flags & ~PR_FL_IGNORE_KEY)
269 return -EOPNOTSUPP;
270 return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags);
271}
272
273static int blkdev_pr_reserve(struct block_device *bdev,
274 struct pr_reservation __user *arg)
275{
276 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
277 struct pr_reservation rsv;
278
279 if (!capable(CAP_SYS_ADMIN))
280 return -EPERM;
281 if (!ops || !ops->pr_reserve)
282 return -EOPNOTSUPP;
283 if (copy_from_user(&rsv, arg, sizeof(rsv)))
284 return -EFAULT;
285
286 if (rsv.flags & ~PR_FL_IGNORE_KEY)
287 return -EOPNOTSUPP;
288 return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags);
289}
290
291static int blkdev_pr_release(struct block_device *bdev,
292 struct pr_reservation __user *arg)
293{
294 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
295 struct pr_reservation rsv;
296
297 if (!capable(CAP_SYS_ADMIN))
298 return -EPERM;
299 if (!ops || !ops->pr_release)
300 return -EOPNOTSUPP;
301 if (copy_from_user(&rsv, arg, sizeof(rsv)))
302 return -EFAULT;
303
304 if (rsv.flags)
305 return -EOPNOTSUPP;
306 return ops->pr_release(bdev, rsv.key, rsv.type);
307}
308
309static int blkdev_pr_preempt(struct block_device *bdev,
310 struct pr_preempt __user *arg, bool abort)
311{
312 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
313 struct pr_preempt p;
314
315 if (!capable(CAP_SYS_ADMIN))
316 return -EPERM;
317 if (!ops || !ops->pr_preempt)
318 return -EOPNOTSUPP;
319 if (copy_from_user(&p, arg, sizeof(p)))
320 return -EFAULT;
321
322 if (p.flags)
323 return -EOPNOTSUPP;
324 return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort);
325}
326
327static int blkdev_pr_clear(struct block_device *bdev,
328 struct pr_clear __user *arg)
329{
330 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
331 struct pr_clear c;
332
333 if (!capable(CAP_SYS_ADMIN))
334 return -EPERM;
335 if (!ops || !ops->pr_clear)
336 return -EOPNOTSUPP;
337 if (copy_from_user(&c, arg, sizeof(c)))
338 return -EFAULT;
339
340 if (c.flags)
341 return -EOPNOTSUPP;
342 return ops->pr_clear(bdev, c.key);
343}
344
345/*
346 * Is it an unrecognized ioctl? The correct returns are either
347 * ENOTTY (final) or ENOIOCTLCMD ("I don't know this one, try a
348 * fallback"). ENOIOCTLCMD gets turned into ENOTTY by the ioctl
349 * code before returning.
350 *
351 * Confused drivers sometimes return EINVAL, which is wrong. It
352 * means "I understood the ioctl command, but the parameters to
353 * it were wrong".
354 *
355 * We should aim to just fix the broken drivers, the EINVAL case
356 * should go away.
357 */
358static inline int is_unrecognized_ioctl(int ret)
359{
360 return ret == -EINVAL ||
361 ret == -ENOTTY ||
362 ret == -ENOIOCTLCMD;
363}
364
365static int blkdev_flushbuf(struct block_device *bdev, fmode_t mode,
366 unsigned cmd, unsigned long arg)
367{
368 int ret;
369
370 if (!capable(CAP_SYS_ADMIN))
371 return -EACCES;
372
373 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
374 if (!is_unrecognized_ioctl(ret))
375 return ret;
376
377 fsync_bdev(bdev);
378 invalidate_bdev(bdev);
379 return 0;
380}
381
382static int blkdev_roset(struct block_device *bdev, fmode_t mode,
383 unsigned cmd, unsigned long arg)
384{
385 int ret, n;
386
387 if (!capable(CAP_SYS_ADMIN))
388 return -EACCES;
389
390 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
391 if (!is_unrecognized_ioctl(ret))
392 return ret;
393 if (get_user(n, (int __user *)arg))
394 return -EFAULT;
395 set_device_ro(bdev, n);
396 return 0;
397}
398
399static int blkdev_getgeo(struct block_device *bdev,
400 struct hd_geometry __user *argp)
401{
402 struct gendisk *disk = bdev->bd_disk;
403 struct hd_geometry geo;
404 int ret;
405
406 if (!argp)
407 return -EINVAL;
408 if (!disk->fops->getgeo)
409 return -ENOTTY;
410
411 /*
412 * We need to set the startsect first, the driver may
413 * want to override it.
414 */
415 memset(&geo, 0, sizeof(geo));
416 geo.start = get_start_sect(bdev);
417 ret = disk->fops->getgeo(bdev, &geo);
418 if (ret)
419 return ret;
420 if (copy_to_user(argp, &geo, sizeof(geo)))
421 return -EFAULT;
422 return 0;
423}
424
425#ifdef CONFIG_COMPAT
426struct compat_hd_geometry {
427 unsigned char heads;
428 unsigned char sectors;
429 unsigned short cylinders;
430 u32 start;
431};
432
433static int compat_hdio_getgeo(struct block_device *bdev,
434 struct compat_hd_geometry __user *ugeo)
435{
436 struct gendisk *disk = bdev->bd_disk;
437 struct hd_geometry geo;
438 int ret;
439
440 if (!ugeo)
441 return -EINVAL;
442 if (!disk->fops->getgeo)
443 return -ENOTTY;
444
445 memset(&geo, 0, sizeof(geo));
446 /*
447 * We need to set the startsect first, the driver may
448 * want to override it.
449 */
450 geo.start = get_start_sect(bdev);
451 ret = disk->fops->getgeo(bdev, &geo);
452 if (ret)
453 return ret;
454
455 ret = copy_to_user(ugeo, &geo, 4);
456 ret |= put_user(geo.start, &ugeo->start);
457 if (ret)
458 ret = -EFAULT;
459
460 return ret;
461}
462#endif
463
464/* set the logical block size */
465static int blkdev_bszset(struct block_device *bdev, fmode_t mode,
466 int __user *argp)
467{
468 int ret, n;
469
470 if (!capable(CAP_SYS_ADMIN))
471 return -EACCES;
472 if (!argp)
473 return -EINVAL;
474 if (get_user(n, argp))
475 return -EFAULT;
476
477 if (!(mode & FMODE_EXCL)) {
478 bdgrab(bdev);
479 if (blkdev_get(bdev, mode | FMODE_EXCL, &bdev) < 0)
480 return -EBUSY;
481 }
482
483 ret = set_blocksize(bdev, n);
484 if (!(mode & FMODE_EXCL))
485 blkdev_put(bdev, mode | FMODE_EXCL);
486 return ret;
487}
488
489/*
490 * Common commands that are handled the same way on native and compat
491 * user space. Note the separate arg/argp parameters that are needed
492 * to deal with the compat_ptr() conversion.
493 */
494static int blkdev_common_ioctl(struct block_device *bdev, fmode_t mode,
495 unsigned cmd, unsigned long arg, void __user *argp)
496{
497 unsigned int max_sectors;
498
499 switch (cmd) {
500 case BLKFLSBUF:
501 return blkdev_flushbuf(bdev, mode, cmd, arg);
502 case BLKROSET:
503 return blkdev_roset(bdev, mode, cmd, arg);
504 case BLKDISCARD:
505 return blk_ioctl_discard(bdev, mode, arg, 0);
506 case BLKSECDISCARD:
507 return blk_ioctl_discard(bdev, mode, arg,
508 BLKDEV_DISCARD_SECURE);
509 case BLKZEROOUT:
510 return blk_ioctl_zeroout(bdev, mode, arg);
511 case BLKREPORTZONE:
512 return blkdev_report_zones_ioctl(bdev, mode, cmd, arg);
513 case BLKRESETZONE:
514 case BLKOPENZONE:
515 case BLKCLOSEZONE:
516 case BLKFINISHZONE:
517 return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg);
518 case BLKGETZONESZ:
519 return put_uint(argp, bdev_zone_sectors(bdev));
520 case BLKGETNRZONES:
521 return put_uint(argp, blkdev_nr_zones(bdev->bd_disk));
522 case BLKROGET:
523 return put_int(argp, bdev_read_only(bdev) != 0);
524 case BLKSSZGET: /* get block device logical block size */
525 return put_int(argp, bdev_logical_block_size(bdev));
526 case BLKPBSZGET: /* get block device physical block size */
527 return put_uint(argp, bdev_physical_block_size(bdev));
528 case BLKIOMIN:
529 return put_uint(argp, bdev_io_min(bdev));
530 case BLKIOOPT:
531 return put_uint(argp, bdev_io_opt(bdev));
532 case BLKALIGNOFF:
533 return put_int(argp, bdev_alignment_offset(bdev));
534 case BLKDISCARDZEROES:
535 return put_uint(argp, 0);
536 case BLKSECTGET:
537 max_sectors = min_t(unsigned int, USHRT_MAX,
538 queue_max_sectors(bdev_get_queue(bdev)));
539 return put_ushort(argp, max_sectors);
540 case BLKROTATIONAL:
541 return put_ushort(argp, !blk_queue_nonrot(bdev_get_queue(bdev)));
542 case BLKRASET:
543 case BLKFRASET:
544 if(!capable(CAP_SYS_ADMIN))
545 return -EACCES;
546 bdev->bd_bdi->ra_pages = (arg * 512) / PAGE_SIZE;
547 return 0;
548 case BLKRRPART:
549 return blkdev_reread_part(bdev);
550 case BLKTRACESTART:
551 case BLKTRACESTOP:
552 case BLKTRACETEARDOWN:
553 return blk_trace_ioctl(bdev, cmd, argp);
554 case IOC_PR_REGISTER:
555 return blkdev_pr_register(bdev, argp);
556 case IOC_PR_RESERVE:
557 return blkdev_pr_reserve(bdev, argp);
558 case IOC_PR_RELEASE:
559 return blkdev_pr_release(bdev, argp);
560 case IOC_PR_PREEMPT:
561 return blkdev_pr_preempt(bdev, argp, false);
562 case IOC_PR_PREEMPT_ABORT:
563 return blkdev_pr_preempt(bdev, argp, true);
564 case IOC_PR_CLEAR:
565 return blkdev_pr_clear(bdev, argp);
566 default:
567 return -ENOIOCTLCMD;
568 }
569}
570
571/*
572 * Always keep this in sync with compat_blkdev_ioctl()
573 * to handle all incompatible commands in both functions.
574 *
575 * New commands must be compatible and go into blkdev_common_ioctl
576 */
577int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
578 unsigned long arg)
579{
580 int ret;
581 loff_t size;
582 void __user *argp = (void __user *)arg;
583
584 switch (cmd) {
585 /* These need separate implementations for the data structure */
586 case HDIO_GETGEO:
587 return blkdev_getgeo(bdev, argp);
588 case BLKPG:
589 return blkpg_ioctl(bdev, argp);
590
591 /* Compat mode returns 32-bit data instead of 'long' */
592 case BLKRAGET:
593 case BLKFRAGET:
594 if (!argp)
595 return -EINVAL;
596 return put_long(argp, (bdev->bd_bdi->ra_pages*PAGE_SIZE) / 512);
597 case BLKGETSIZE:
598 size = i_size_read(bdev->bd_inode);
599 if ((size >> 9) > ~0UL)
600 return -EFBIG;
601 return put_ulong(argp, size >> 9);
602
603 /* The data is compatible, but the command number is different */
604 case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
605 return put_int(argp, block_size(bdev));
606 case BLKBSZSET:
607 return blkdev_bszset(bdev, mode, argp);
608 case BLKGETSIZE64:
609 return put_u64(argp, i_size_read(bdev->bd_inode));
610
611 /* Incompatible alignment on i386 */
612 case BLKTRACESETUP:
613 return blk_trace_ioctl(bdev, cmd, argp);
614 default:
615 break;
616 }
617
618 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
619 if (ret == -ENOIOCTLCMD)
620 return __blkdev_driver_ioctl(bdev, mode, cmd, arg);
621
622 return ret;
623}
624EXPORT_SYMBOL_GPL(blkdev_ioctl); /* for /dev/raw */
625
626#ifdef CONFIG_COMPAT
627
628#define BLKBSZGET_32 _IOR(0x12, 112, int)
629#define BLKBSZSET_32 _IOW(0x12, 113, int)
630#define BLKGETSIZE64_32 _IOR(0x12, 114, int)
631
632/* Most of the generic ioctls are handled in the normal fallback path.
633 This assumes the blkdev's low level compat_ioctl always returns
634 ENOIOCTLCMD for unknown ioctls. */
635long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
636{
637 int ret;
638 void __user *argp = compat_ptr(arg);
639 struct inode *inode = file->f_mapping->host;
640 struct block_device *bdev = inode->i_bdev;
641 struct gendisk *disk = bdev->bd_disk;
642 fmode_t mode = file->f_mode;
643 loff_t size;
644
645 /*
646 * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
647 * to updated it before every ioctl.
648 */
649 if (file->f_flags & O_NDELAY)
650 mode |= FMODE_NDELAY;
651 else
652 mode &= ~FMODE_NDELAY;
653
654 switch (cmd) {
655 /* These need separate implementations for the data structure */
656 case HDIO_GETGEO:
657 return compat_hdio_getgeo(bdev, argp);
658 case BLKPG:
659 return compat_blkpg_ioctl(bdev, argp);
660
661 /* Compat mode returns 32-bit data instead of 'long' */
662 case BLKRAGET:
663 case BLKFRAGET:
664 if (!argp)
665 return -EINVAL;
666 return compat_put_long(argp,
667 (bdev->bd_bdi->ra_pages * PAGE_SIZE) / 512);
668 case BLKGETSIZE:
669 size = i_size_read(bdev->bd_inode);
670 if ((size >> 9) > ~0UL)
671 return -EFBIG;
672 return compat_put_ulong(argp, size >> 9);
673
674 /* The data is compatible, but the command number is different */
675 case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
676 return put_int(argp, bdev_logical_block_size(bdev));
677 case BLKBSZSET_32:
678 return blkdev_bszset(bdev, mode, argp);
679 case BLKGETSIZE64_32:
680 return put_u64(argp, i_size_read(bdev->bd_inode));
681
682 /* Incompatible alignment on i386 */
683 case BLKTRACESETUP32:
684 return blk_trace_ioctl(bdev, cmd, argp);
685 default:
686 break;
687 }
688
689 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
690 if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
691 ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
692
693 return ret;
694}
695#endif