Loading...
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/capability.h>
3#include <linux/blkdev.h>
4#include <linux/export.h>
5#include <linux/gfp.h>
6#include <linux/blkpg.h>
7#include <linux/hdreg.h>
8#include <linux/backing-dev.h>
9#include <linux/fs.h>
10#include <linux/blktrace_api.h>
11#include <linux/pr.h>
12#include <linux/uaccess.h>
13
14static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user *arg)
15{
16 struct block_device *bdevp;
17 struct gendisk *disk;
18 struct hd_struct *part, *lpart;
19 struct blkpg_ioctl_arg a;
20 struct blkpg_partition p;
21 struct disk_part_iter piter;
22 long long start, length;
23 int partno;
24
25 if (!capable(CAP_SYS_ADMIN))
26 return -EACCES;
27 if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg)))
28 return -EFAULT;
29 if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition)))
30 return -EFAULT;
31 disk = bdev->bd_disk;
32 if (bdev != bdev->bd_contains)
33 return -EINVAL;
34 partno = p.pno;
35 if (partno <= 0)
36 return -EINVAL;
37 switch (a.op) {
38 case BLKPG_ADD_PARTITION:
39 start = p.start >> 9;
40 length = p.length >> 9;
41 /* check for fit in a hd_struct */
42 if (sizeof(sector_t) == sizeof(long) &&
43 sizeof(long long) > sizeof(long)) {
44 long pstart = start, plength = length;
45 if (pstart != start || plength != length
46 || pstart < 0 || plength < 0 || partno > 65535)
47 return -EINVAL;
48 }
49 /* check if partition is aligned to blocksize */
50 if (p.start & (bdev_logical_block_size(bdev) - 1))
51 return -EINVAL;
52
53 mutex_lock(&bdev->bd_mutex);
54
55 /* overlap? */
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);
62 mutex_unlock(&bdev->bd_mutex);
63 return -EBUSY;
64 }
65 }
66 disk_part_iter_exit(&piter);
67
68 /* all seems OK */
69 part = add_partition(disk, partno, start, length,
70 ADDPART_FLAG_NONE, NULL);
71 mutex_unlock(&bdev->bd_mutex);
72 return PTR_ERR_OR_ZERO(part);
73 case BLKPG_DEL_PARTITION:
74 part = disk_get_part(disk, partno);
75 if (!part)
76 return -ENXIO;
77
78 bdevp = bdget(part_devt(part));
79 disk_put_part(part);
80 if (!bdevp)
81 return -ENOMEM;
82
83 mutex_lock(&bdevp->bd_mutex);
84 if (bdevp->bd_openers) {
85 mutex_unlock(&bdevp->bd_mutex);
86 bdput(bdevp);
87 return -EBUSY;
88 }
89 /* all seems OK */
90 fsync_bdev(bdevp);
91 invalidate_bdev(bdevp);
92
93 mutex_lock_nested(&bdev->bd_mutex, 1);
94 delete_partition(disk, partno);
95 mutex_unlock(&bdev->bd_mutex);
96 mutex_unlock(&bdevp->bd_mutex);
97 bdput(bdevp);
98
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);
152 return 0;
153 default:
154 return -EINVAL;
155 }
156}
157
158/*
159 * This is an exported API for the block driver, and will not
160 * acquire bd_mutex. This API should be used in case that
161 * caller has held bd_mutex already.
162 */
163int __blkdev_reread_part(struct block_device *bdev)
164{
165 struct gendisk *disk = bdev->bd_disk;
166
167 if (!disk_part_scan_enabled(disk) || bdev != bdev->bd_contains)
168 return -EINVAL;
169 if (!capable(CAP_SYS_ADMIN))
170 return -EACCES;
171
172 lockdep_assert_held(&bdev->bd_mutex);
173
174 return rescan_partitions(disk, bdev);
175}
176EXPORT_SYMBOL(__blkdev_reread_part);
177
178/*
179 * This is an exported API for the block driver, and will
180 * try to acquire bd_mutex. If bd_mutex has been held already
181 * in current context, please call __blkdev_reread_part().
182 *
183 * Make sure the held locks in current context aren't required
184 * in open()/close() handler and I/O path for avoiding ABBA deadlock:
185 * - bd_mutex is held before calling block driver's open/close
186 * handler
187 * - reading partition table may submit I/O to the block device
188 */
189int blkdev_reread_part(struct block_device *bdev)
190{
191 int res;
192
193 mutex_lock(&bdev->bd_mutex);
194 res = __blkdev_reread_part(bdev);
195 mutex_unlock(&bdev->bd_mutex);
196
197 return res;
198}
199EXPORT_SYMBOL(blkdev_reread_part);
200
201static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode,
202 unsigned long arg, unsigned long flags)
203{
204 uint64_t range[2];
205 uint64_t start, len;
206 struct request_queue *q = bdev_get_queue(bdev);
207 struct address_space *mapping = bdev->bd_inode->i_mapping;
208
209
210 if (!(mode & FMODE_WRITE))
211 return -EBADF;
212
213 if (!blk_queue_discard(q))
214 return -EOPNOTSUPP;
215
216 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
217 return -EFAULT;
218
219 start = range[0];
220 len = range[1];
221
222 if (start & 511)
223 return -EINVAL;
224 if (len & 511)
225 return -EINVAL;
226
227 if (start + len > i_size_read(bdev->bd_inode))
228 return -EINVAL;
229 truncate_inode_pages_range(mapping, start, start + len - 1);
230 return blkdev_issue_discard(bdev, start >> 9, len >> 9,
231 GFP_KERNEL, flags);
232}
233
234static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode,
235 unsigned long arg)
236{
237 uint64_t range[2];
238 struct address_space *mapping;
239 uint64_t start, end, len;
240
241 if (!(mode & FMODE_WRITE))
242 return -EBADF;
243
244 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
245 return -EFAULT;
246
247 start = range[0];
248 len = range[1];
249 end = start + len - 1;
250
251 if (start & 511)
252 return -EINVAL;
253 if (len & 511)
254 return -EINVAL;
255 if (end >= (uint64_t)i_size_read(bdev->bd_inode))
256 return -EINVAL;
257 if (end < start)
258 return -EINVAL;
259
260 /* Invalidate the page cache, including dirty pages */
261 mapping = bdev->bd_inode->i_mapping;
262 truncate_inode_pages_range(mapping, start, end);
263
264 return blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL,
265 BLKDEV_ZERO_NOUNMAP);
266}
267
268static int put_ushort(unsigned long arg, unsigned short val)
269{
270 return put_user(val, (unsigned short __user *)arg);
271}
272
273static int put_int(unsigned long arg, int val)
274{
275 return put_user(val, (int __user *)arg);
276}
277
278static int put_uint(unsigned long arg, unsigned int val)
279{
280 return put_user(val, (unsigned int __user *)arg);
281}
282
283static int put_long(unsigned long arg, long val)
284{
285 return put_user(val, (long __user *)arg);
286}
287
288static int put_ulong(unsigned long arg, unsigned long val)
289{
290 return put_user(val, (unsigned long __user *)arg);
291}
292
293static int put_u64(unsigned long arg, u64 val)
294{
295 return put_user(val, (u64 __user *)arg);
296}
297
298int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
299 unsigned cmd, unsigned long arg)
300{
301 struct gendisk *disk = bdev->bd_disk;
302
303 if (disk->fops->ioctl)
304 return disk->fops->ioctl(bdev, mode, cmd, arg);
305
306 return -ENOTTY;
307}
308/*
309 * For the record: _GPL here is only because somebody decided to slap it
310 * on the previous export. Sheer idiocy, since it wasn't copyrightable
311 * at all and could be open-coded without any exports by anybody who cares.
312 */
313EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl);
314
315static int blkdev_pr_register(struct block_device *bdev,
316 struct pr_registration __user *arg)
317{
318 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
319 struct pr_registration reg;
320
321 if (!capable(CAP_SYS_ADMIN))
322 return -EPERM;
323 if (!ops || !ops->pr_register)
324 return -EOPNOTSUPP;
325 if (copy_from_user(®, arg, sizeof(reg)))
326 return -EFAULT;
327
328 if (reg.flags & ~PR_FL_IGNORE_KEY)
329 return -EOPNOTSUPP;
330 return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags);
331}
332
333static int blkdev_pr_reserve(struct block_device *bdev,
334 struct pr_reservation __user *arg)
335{
336 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
337 struct pr_reservation rsv;
338
339 if (!capable(CAP_SYS_ADMIN))
340 return -EPERM;
341 if (!ops || !ops->pr_reserve)
342 return -EOPNOTSUPP;
343 if (copy_from_user(&rsv, arg, sizeof(rsv)))
344 return -EFAULT;
345
346 if (rsv.flags & ~PR_FL_IGNORE_KEY)
347 return -EOPNOTSUPP;
348 return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags);
349}
350
351static int blkdev_pr_release(struct block_device *bdev,
352 struct pr_reservation __user *arg)
353{
354 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
355 struct pr_reservation rsv;
356
357 if (!capable(CAP_SYS_ADMIN))
358 return -EPERM;
359 if (!ops || !ops->pr_release)
360 return -EOPNOTSUPP;
361 if (copy_from_user(&rsv, arg, sizeof(rsv)))
362 return -EFAULT;
363
364 if (rsv.flags)
365 return -EOPNOTSUPP;
366 return ops->pr_release(bdev, rsv.key, rsv.type);
367}
368
369static int blkdev_pr_preempt(struct block_device *bdev,
370 struct pr_preempt __user *arg, bool abort)
371{
372 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
373 struct pr_preempt p;
374
375 if (!capable(CAP_SYS_ADMIN))
376 return -EPERM;
377 if (!ops || !ops->pr_preempt)
378 return -EOPNOTSUPP;
379 if (copy_from_user(&p, arg, sizeof(p)))
380 return -EFAULT;
381
382 if (p.flags)
383 return -EOPNOTSUPP;
384 return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort);
385}
386
387static int blkdev_pr_clear(struct block_device *bdev,
388 struct pr_clear __user *arg)
389{
390 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
391 struct pr_clear c;
392
393 if (!capable(CAP_SYS_ADMIN))
394 return -EPERM;
395 if (!ops || !ops->pr_clear)
396 return -EOPNOTSUPP;
397 if (copy_from_user(&c, arg, sizeof(c)))
398 return -EFAULT;
399
400 if (c.flags)
401 return -EOPNOTSUPP;
402 return ops->pr_clear(bdev, c.key);
403}
404
405/*
406 * Is it an unrecognized ioctl? The correct returns are either
407 * ENOTTY (final) or ENOIOCTLCMD ("I don't know this one, try a
408 * fallback"). ENOIOCTLCMD gets turned into ENOTTY by the ioctl
409 * code before returning.
410 *
411 * Confused drivers sometimes return EINVAL, which is wrong. It
412 * means "I understood the ioctl command, but the parameters to
413 * it were wrong".
414 *
415 * We should aim to just fix the broken drivers, the EINVAL case
416 * should go away.
417 */
418static inline int is_unrecognized_ioctl(int ret)
419{
420 return ret == -EINVAL ||
421 ret == -ENOTTY ||
422 ret == -ENOIOCTLCMD;
423}
424
425static int blkdev_flushbuf(struct block_device *bdev, fmode_t mode,
426 unsigned cmd, unsigned long arg)
427{
428 int ret;
429
430 if (!capable(CAP_SYS_ADMIN))
431 return -EACCES;
432
433 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
434 if (!is_unrecognized_ioctl(ret))
435 return ret;
436
437 fsync_bdev(bdev);
438 invalidate_bdev(bdev);
439 return 0;
440}
441
442static int blkdev_roset(struct block_device *bdev, fmode_t mode,
443 unsigned cmd, unsigned long arg)
444{
445 int ret, n;
446
447 if (!capable(CAP_SYS_ADMIN))
448 return -EACCES;
449
450 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
451 if (!is_unrecognized_ioctl(ret))
452 return ret;
453 if (get_user(n, (int __user *)arg))
454 return -EFAULT;
455 set_device_ro(bdev, n);
456 return 0;
457}
458
459static int blkdev_getgeo(struct block_device *bdev,
460 struct hd_geometry __user *argp)
461{
462 struct gendisk *disk = bdev->bd_disk;
463 struct hd_geometry geo;
464 int ret;
465
466 if (!argp)
467 return -EINVAL;
468 if (!disk->fops->getgeo)
469 return -ENOTTY;
470
471 /*
472 * We need to set the startsect first, the driver may
473 * want to override it.
474 */
475 memset(&geo, 0, sizeof(geo));
476 geo.start = get_start_sect(bdev);
477 ret = disk->fops->getgeo(bdev, &geo);
478 if (ret)
479 return ret;
480 if (copy_to_user(argp, &geo, sizeof(geo)))
481 return -EFAULT;
482 return 0;
483}
484
485/* set the logical block size */
486static int blkdev_bszset(struct block_device *bdev, fmode_t mode,
487 int __user *argp)
488{
489 int ret, n;
490
491 if (!capable(CAP_SYS_ADMIN))
492 return -EACCES;
493 if (!argp)
494 return -EINVAL;
495 if (get_user(n, argp))
496 return -EFAULT;
497
498 if (!(mode & FMODE_EXCL)) {
499 bdgrab(bdev);
500 if (blkdev_get(bdev, mode | FMODE_EXCL, &bdev) < 0)
501 return -EBUSY;
502 }
503
504 ret = set_blocksize(bdev, n);
505 if (!(mode & FMODE_EXCL))
506 blkdev_put(bdev, mode | FMODE_EXCL);
507 return ret;
508}
509
510/*
511 * always keep this in sync with compat_blkdev_ioctl()
512 */
513int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
514 unsigned long arg)
515{
516 void __user *argp = (void __user *)arg;
517 loff_t size;
518 unsigned int max_sectors;
519
520 switch (cmd) {
521 case BLKFLSBUF:
522 return blkdev_flushbuf(bdev, mode, cmd, arg);
523 case BLKROSET:
524 return blkdev_roset(bdev, mode, cmd, arg);
525 case BLKDISCARD:
526 return blk_ioctl_discard(bdev, mode, arg, 0);
527 case BLKSECDISCARD:
528 return blk_ioctl_discard(bdev, mode, arg,
529 BLKDEV_DISCARD_SECURE);
530 case BLKZEROOUT:
531 return blk_ioctl_zeroout(bdev, mode, arg);
532 case BLKREPORTZONE:
533 return blkdev_report_zones_ioctl(bdev, mode, cmd, arg);
534 case BLKRESETZONE:
535 return blkdev_reset_zones_ioctl(bdev, mode, cmd, arg);
536 case BLKGETZONESZ:
537 return put_uint(arg, bdev_zone_sectors(bdev));
538 case BLKGETNRZONES:
539 return put_uint(arg, blkdev_nr_zones(bdev));
540 case HDIO_GETGEO:
541 return blkdev_getgeo(bdev, argp);
542 case BLKRAGET:
543 case BLKFRAGET:
544 if (!arg)
545 return -EINVAL;
546 return put_long(arg, (bdev->bd_bdi->ra_pages*PAGE_SIZE) / 512);
547 case BLKROGET:
548 return put_int(arg, bdev_read_only(bdev) != 0);
549 case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
550 return put_int(arg, block_size(bdev));
551 case BLKSSZGET: /* get block device logical block size */
552 return put_int(arg, bdev_logical_block_size(bdev));
553 case BLKPBSZGET: /* get block device physical block size */
554 return put_uint(arg, bdev_physical_block_size(bdev));
555 case BLKIOMIN:
556 return put_uint(arg, bdev_io_min(bdev));
557 case BLKIOOPT:
558 return put_uint(arg, bdev_io_opt(bdev));
559 case BLKALIGNOFF:
560 return put_int(arg, bdev_alignment_offset(bdev));
561 case BLKDISCARDZEROES:
562 return put_uint(arg, 0);
563 case BLKSECTGET:
564 max_sectors = min_t(unsigned int, USHRT_MAX,
565 queue_max_sectors(bdev_get_queue(bdev)));
566 return put_ushort(arg, max_sectors);
567 case BLKROTATIONAL:
568 return put_ushort(arg, !blk_queue_nonrot(bdev_get_queue(bdev)));
569 case BLKRASET:
570 case BLKFRASET:
571 if(!capable(CAP_SYS_ADMIN))
572 return -EACCES;
573 bdev->bd_bdi->ra_pages = (arg * 512) / PAGE_SIZE;
574 return 0;
575 case BLKBSZSET:
576 return blkdev_bszset(bdev, mode, argp);
577 case BLKPG:
578 return blkpg_ioctl(bdev, argp);
579 case BLKRRPART:
580 return blkdev_reread_part(bdev);
581 case BLKGETSIZE:
582 size = i_size_read(bdev->bd_inode);
583 if ((size >> 9) > ~0UL)
584 return -EFBIG;
585 return put_ulong(arg, size >> 9);
586 case BLKGETSIZE64:
587 return put_u64(arg, i_size_read(bdev->bd_inode));
588 case BLKTRACESTART:
589 case BLKTRACESTOP:
590 case BLKTRACESETUP:
591 case BLKTRACETEARDOWN:
592 return blk_trace_ioctl(bdev, cmd, argp);
593 case IOC_PR_REGISTER:
594 return blkdev_pr_register(bdev, argp);
595 case IOC_PR_RESERVE:
596 return blkdev_pr_reserve(bdev, argp);
597 case IOC_PR_RELEASE:
598 return blkdev_pr_release(bdev, argp);
599 case IOC_PR_PREEMPT:
600 return blkdev_pr_preempt(bdev, argp, false);
601 case IOC_PR_PREEMPT_ABORT:
602 return blkdev_pr_preempt(bdev, argp, true);
603 case IOC_PR_CLEAR:
604 return blkdev_pr_clear(bdev, argp);
605 default:
606 return __blkdev_driver_ioctl(bdev, mode, cmd, arg);
607 }
608}
609EXPORT_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 gendisk *disk = bdev->bd_disk;
20 struct blkpg_partition p;
21 sector_t start, length, capacity, end;
22
23 if (!capable(CAP_SYS_ADMIN))
24 return -EACCES;
25 if (copy_from_user(&p, upart, sizeof(struct blkpg_partition)))
26 return -EFAULT;
27 if (bdev_is_partition(bdev))
28 return -EINVAL;
29
30 if (p.pno <= 0)
31 return -EINVAL;
32
33 if (op == BLKPG_DEL_PARTITION)
34 return bdev_del_partition(disk, p.pno);
35
36 if (p.start < 0 || p.length <= 0 || p.start + p.length < 0)
37 return -EINVAL;
38 /* Check that the partition is aligned to the block size */
39 if (!IS_ALIGNED(p.start | p.length, bdev_logical_block_size(bdev)))
40 return -EINVAL;
41
42 start = p.start >> SECTOR_SHIFT;
43 length = p.length >> SECTOR_SHIFT;
44 capacity = get_capacity(disk);
45
46 if (check_add_overflow(start, length, &end))
47 return -EINVAL;
48
49 if (start >= capacity || end > capacity)
50 return -EINVAL;
51
52 switch (op) {
53 case BLKPG_ADD_PARTITION:
54 return bdev_add_partition(disk, p.pno, start, length);
55 case BLKPG_RESIZE_PARTITION:
56 return bdev_resize_partition(disk, p.pno, start, length);
57 default:
58 return -EINVAL;
59 }
60}
61
62static int blkpg_ioctl(struct block_device *bdev,
63 struct blkpg_ioctl_arg __user *arg)
64{
65 struct blkpg_partition __user *udata;
66 int op;
67
68 if (get_user(op, &arg->op) || get_user(udata, &arg->data))
69 return -EFAULT;
70
71 return blkpg_do_ioctl(bdev, udata, op);
72}
73
74#ifdef CONFIG_COMPAT
75struct compat_blkpg_ioctl_arg {
76 compat_int_t op;
77 compat_int_t flags;
78 compat_int_t datalen;
79 compat_caddr_t data;
80};
81
82static int compat_blkpg_ioctl(struct block_device *bdev,
83 struct compat_blkpg_ioctl_arg __user *arg)
84{
85 compat_caddr_t udata;
86 int op;
87
88 if (get_user(op, &arg->op) || get_user(udata, &arg->data))
89 return -EFAULT;
90
91 return blkpg_do_ioctl(bdev, compat_ptr(udata), op);
92}
93#endif
94
95static int blk_ioctl_discard(struct block_device *bdev, blk_mode_t mode,
96 unsigned long arg)
97{
98 uint64_t range[2];
99 uint64_t start, len, end;
100 struct inode *inode = bdev->bd_inode;
101 int err;
102
103 if (!(mode & BLK_OPEN_WRITE))
104 return -EBADF;
105
106 if (!bdev_max_discard_sectors(bdev))
107 return -EOPNOTSUPP;
108
109 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
110 return -EFAULT;
111
112 start = range[0];
113 len = range[1];
114
115 if (start & 511)
116 return -EINVAL;
117 if (len & 511)
118 return -EINVAL;
119
120 if (check_add_overflow(start, len, &end) ||
121 end > bdev_nr_bytes(bdev))
122 return -EINVAL;
123
124 filemap_invalidate_lock(inode->i_mapping);
125 err = truncate_bdev_range(bdev, mode, start, start + len - 1);
126 if (err)
127 goto fail;
128 err = blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL);
129fail:
130 filemap_invalidate_unlock(inode->i_mapping);
131 return err;
132}
133
134static int blk_ioctl_secure_erase(struct block_device *bdev, blk_mode_t mode,
135 void __user *argp)
136{
137 uint64_t start, len;
138 uint64_t range[2];
139 int err;
140
141 if (!(mode & BLK_OPEN_WRITE))
142 return -EBADF;
143 if (!bdev_max_secure_erase_sectors(bdev))
144 return -EOPNOTSUPP;
145 if (copy_from_user(range, argp, sizeof(range)))
146 return -EFAULT;
147
148 start = range[0];
149 len = range[1];
150 if ((start & 511) || (len & 511))
151 return -EINVAL;
152 if (start + len > bdev_nr_bytes(bdev))
153 return -EINVAL;
154
155 filemap_invalidate_lock(bdev->bd_inode->i_mapping);
156 err = truncate_bdev_range(bdev, mode, start, start + len - 1);
157 if (!err)
158 err = blkdev_issue_secure_erase(bdev, start >> 9, len >> 9,
159 GFP_KERNEL);
160 filemap_invalidate_unlock(bdev->bd_inode->i_mapping);
161 return err;
162}
163
164
165static int blk_ioctl_zeroout(struct block_device *bdev, blk_mode_t mode,
166 unsigned long arg)
167{
168 uint64_t range[2];
169 uint64_t start, end, len;
170 struct inode *inode = bdev->bd_inode;
171 int err;
172
173 if (!(mode & BLK_OPEN_WRITE))
174 return -EBADF;
175
176 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
177 return -EFAULT;
178
179 start = range[0];
180 len = range[1];
181 end = start + len - 1;
182
183 if (start & 511)
184 return -EINVAL;
185 if (len & 511)
186 return -EINVAL;
187 if (end >= (uint64_t)bdev_nr_bytes(bdev))
188 return -EINVAL;
189 if (end < start)
190 return -EINVAL;
191
192 /* Invalidate the page cache, including dirty pages */
193 filemap_invalidate_lock(inode->i_mapping);
194 err = truncate_bdev_range(bdev, mode, start, end);
195 if (err)
196 goto fail;
197
198 err = blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL,
199 BLKDEV_ZERO_NOUNMAP);
200
201fail:
202 filemap_invalidate_unlock(inode->i_mapping);
203 return err;
204}
205
206static int put_ushort(unsigned short __user *argp, unsigned short val)
207{
208 return put_user(val, argp);
209}
210
211static int put_int(int __user *argp, int val)
212{
213 return put_user(val, argp);
214}
215
216static int put_uint(unsigned int __user *argp, unsigned int val)
217{
218 return put_user(val, argp);
219}
220
221static int put_long(long __user *argp, long val)
222{
223 return put_user(val, argp);
224}
225
226static int put_ulong(unsigned long __user *argp, unsigned long val)
227{
228 return put_user(val, argp);
229}
230
231static int put_u64(u64 __user *argp, u64 val)
232{
233 return put_user(val, argp);
234}
235
236#ifdef CONFIG_COMPAT
237static int compat_put_long(compat_long_t __user *argp, long val)
238{
239 return put_user(val, argp);
240}
241
242static int compat_put_ulong(compat_ulong_t __user *argp, compat_ulong_t val)
243{
244 return put_user(val, argp);
245}
246#endif
247
248#ifdef CONFIG_COMPAT
249/*
250 * This is the equivalent of compat_ptr_ioctl(), to be used by block
251 * drivers that implement only commands that are completely compatible
252 * between 32-bit and 64-bit user space
253 */
254int blkdev_compat_ptr_ioctl(struct block_device *bdev, blk_mode_t mode,
255 unsigned cmd, unsigned long arg)
256{
257 struct gendisk *disk = bdev->bd_disk;
258
259 if (disk->fops->ioctl)
260 return disk->fops->ioctl(bdev, mode, cmd,
261 (unsigned long)compat_ptr(arg));
262
263 return -ENOIOCTLCMD;
264}
265EXPORT_SYMBOL(blkdev_compat_ptr_ioctl);
266#endif
267
268static bool blkdev_pr_allowed(struct block_device *bdev, blk_mode_t mode)
269{
270 /* no sense to make reservations for partitions */
271 if (bdev_is_partition(bdev))
272 return false;
273
274 if (capable(CAP_SYS_ADMIN))
275 return true;
276 /*
277 * Only allow unprivileged reservations if the file descriptor is open
278 * for writing.
279 */
280 return mode & BLK_OPEN_WRITE;
281}
282
283static int blkdev_pr_register(struct block_device *bdev, blk_mode_t mode,
284 struct pr_registration __user *arg)
285{
286 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
287 struct pr_registration reg;
288
289 if (!blkdev_pr_allowed(bdev, mode))
290 return -EPERM;
291 if (!ops || !ops->pr_register)
292 return -EOPNOTSUPP;
293 if (copy_from_user(®, arg, sizeof(reg)))
294 return -EFAULT;
295
296 if (reg.flags & ~PR_FL_IGNORE_KEY)
297 return -EOPNOTSUPP;
298 return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags);
299}
300
301static int blkdev_pr_reserve(struct block_device *bdev, blk_mode_t mode,
302 struct pr_reservation __user *arg)
303{
304 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
305 struct pr_reservation rsv;
306
307 if (!blkdev_pr_allowed(bdev, mode))
308 return -EPERM;
309 if (!ops || !ops->pr_reserve)
310 return -EOPNOTSUPP;
311 if (copy_from_user(&rsv, arg, sizeof(rsv)))
312 return -EFAULT;
313
314 if (rsv.flags & ~PR_FL_IGNORE_KEY)
315 return -EOPNOTSUPP;
316 return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags);
317}
318
319static int blkdev_pr_release(struct block_device *bdev, blk_mode_t mode,
320 struct pr_reservation __user *arg)
321{
322 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
323 struct pr_reservation rsv;
324
325 if (!blkdev_pr_allowed(bdev, mode))
326 return -EPERM;
327 if (!ops || !ops->pr_release)
328 return -EOPNOTSUPP;
329 if (copy_from_user(&rsv, arg, sizeof(rsv)))
330 return -EFAULT;
331
332 if (rsv.flags)
333 return -EOPNOTSUPP;
334 return ops->pr_release(bdev, rsv.key, rsv.type);
335}
336
337static int blkdev_pr_preempt(struct block_device *bdev, blk_mode_t mode,
338 struct pr_preempt __user *arg, bool abort)
339{
340 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
341 struct pr_preempt p;
342
343 if (!blkdev_pr_allowed(bdev, mode))
344 return -EPERM;
345 if (!ops || !ops->pr_preempt)
346 return -EOPNOTSUPP;
347 if (copy_from_user(&p, arg, sizeof(p)))
348 return -EFAULT;
349
350 if (p.flags)
351 return -EOPNOTSUPP;
352 return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort);
353}
354
355static int blkdev_pr_clear(struct block_device *bdev, blk_mode_t mode,
356 struct pr_clear __user *arg)
357{
358 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
359 struct pr_clear c;
360
361 if (!blkdev_pr_allowed(bdev, mode))
362 return -EPERM;
363 if (!ops || !ops->pr_clear)
364 return -EOPNOTSUPP;
365 if (copy_from_user(&c, arg, sizeof(c)))
366 return -EFAULT;
367
368 if (c.flags)
369 return -EOPNOTSUPP;
370 return ops->pr_clear(bdev, c.key);
371}
372
373static int blkdev_flushbuf(struct block_device *bdev, unsigned cmd,
374 unsigned long arg)
375{
376 if (!capable(CAP_SYS_ADMIN))
377 return -EACCES;
378
379 mutex_lock(&bdev->bd_holder_lock);
380 if (bdev->bd_holder_ops && bdev->bd_holder_ops->sync)
381 bdev->bd_holder_ops->sync(bdev);
382 else {
383 mutex_unlock(&bdev->bd_holder_lock);
384 sync_blockdev(bdev);
385 }
386
387 invalidate_bdev(bdev);
388 return 0;
389}
390
391static int blkdev_roset(struct block_device *bdev, unsigned cmd,
392 unsigned long arg)
393{
394 int ret, n;
395
396 if (!capable(CAP_SYS_ADMIN))
397 return -EACCES;
398
399 if (get_user(n, (int __user *)arg))
400 return -EFAULT;
401 if (bdev->bd_disk->fops->set_read_only) {
402 ret = bdev->bd_disk->fops->set_read_only(bdev, n);
403 if (ret)
404 return ret;
405 }
406 bdev->bd_read_only = n;
407 return 0;
408}
409
410static int blkdev_getgeo(struct block_device *bdev,
411 struct hd_geometry __user *argp)
412{
413 struct gendisk *disk = bdev->bd_disk;
414 struct hd_geometry geo;
415 int ret;
416
417 if (!argp)
418 return -EINVAL;
419 if (!disk->fops->getgeo)
420 return -ENOTTY;
421
422 /*
423 * We need to set the startsect first, the driver may
424 * want to override it.
425 */
426 memset(&geo, 0, sizeof(geo));
427 geo.start = get_start_sect(bdev);
428 ret = disk->fops->getgeo(bdev, &geo);
429 if (ret)
430 return ret;
431 if (copy_to_user(argp, &geo, sizeof(geo)))
432 return -EFAULT;
433 return 0;
434}
435
436#ifdef CONFIG_COMPAT
437struct compat_hd_geometry {
438 unsigned char heads;
439 unsigned char sectors;
440 unsigned short cylinders;
441 u32 start;
442};
443
444static int compat_hdio_getgeo(struct block_device *bdev,
445 struct compat_hd_geometry __user *ugeo)
446{
447 struct gendisk *disk = bdev->bd_disk;
448 struct hd_geometry geo;
449 int ret;
450
451 if (!ugeo)
452 return -EINVAL;
453 if (!disk->fops->getgeo)
454 return -ENOTTY;
455
456 memset(&geo, 0, sizeof(geo));
457 /*
458 * We need to set the startsect first, the driver may
459 * want to override it.
460 */
461 geo.start = get_start_sect(bdev);
462 ret = disk->fops->getgeo(bdev, &geo);
463 if (ret)
464 return ret;
465
466 ret = copy_to_user(ugeo, &geo, 4);
467 ret |= put_user(geo.start, &ugeo->start);
468 if (ret)
469 ret = -EFAULT;
470
471 return ret;
472}
473#endif
474
475/* set the logical block size */
476static int blkdev_bszset(struct block_device *bdev, blk_mode_t mode,
477 int __user *argp)
478{
479 int ret, n;
480 struct file *file;
481
482 if (!capable(CAP_SYS_ADMIN))
483 return -EACCES;
484 if (!argp)
485 return -EINVAL;
486 if (get_user(n, argp))
487 return -EFAULT;
488
489 if (mode & BLK_OPEN_EXCL)
490 return set_blocksize(bdev, n);
491
492 file = bdev_file_open_by_dev(bdev->bd_dev, mode, &bdev, NULL);
493 if (IS_ERR(file))
494 return -EBUSY;
495 ret = set_blocksize(bdev, n);
496 fput(file);
497 return ret;
498}
499
500/*
501 * Common commands that are handled the same way on native and compat
502 * user space. Note the separate arg/argp parameters that are needed
503 * to deal with the compat_ptr() conversion.
504 */
505static int blkdev_common_ioctl(struct block_device *bdev, blk_mode_t mode,
506 unsigned int cmd, unsigned long arg,
507 void __user *argp)
508{
509 unsigned int max_sectors;
510
511 switch (cmd) {
512 case BLKFLSBUF:
513 return blkdev_flushbuf(bdev, cmd, arg);
514 case BLKROSET:
515 return blkdev_roset(bdev, cmd, arg);
516 case BLKDISCARD:
517 return blk_ioctl_discard(bdev, mode, arg);
518 case BLKSECDISCARD:
519 return blk_ioctl_secure_erase(bdev, mode, argp);
520 case BLKZEROOUT:
521 return blk_ioctl_zeroout(bdev, mode, arg);
522 case BLKGETDISKSEQ:
523 return put_u64(argp, bdev->bd_disk->diskseq);
524 case BLKREPORTZONE:
525 return blkdev_report_zones_ioctl(bdev, cmd, arg);
526 case BLKRESETZONE:
527 case BLKOPENZONE:
528 case BLKCLOSEZONE:
529 case BLKFINISHZONE:
530 return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg);
531 case BLKGETZONESZ:
532 return put_uint(argp, bdev_zone_sectors(bdev));
533 case BLKGETNRZONES:
534 return put_uint(argp, bdev_nr_zones(bdev));
535 case BLKROGET:
536 return put_int(argp, bdev_read_only(bdev) != 0);
537 case BLKSSZGET: /* get block device logical block size */
538 return put_int(argp, bdev_logical_block_size(bdev));
539 case BLKPBSZGET: /* get block device physical block size */
540 return put_uint(argp, bdev_physical_block_size(bdev));
541 case BLKIOMIN:
542 return put_uint(argp, bdev_io_min(bdev));
543 case BLKIOOPT:
544 return put_uint(argp, bdev_io_opt(bdev));
545 case BLKALIGNOFF:
546 return put_int(argp, bdev_alignment_offset(bdev));
547 case BLKDISCARDZEROES:
548 return put_uint(argp, 0);
549 case BLKSECTGET:
550 max_sectors = min_t(unsigned int, USHRT_MAX,
551 queue_max_sectors(bdev_get_queue(bdev)));
552 return put_ushort(argp, max_sectors);
553 case BLKROTATIONAL:
554 return put_ushort(argp, !bdev_nonrot(bdev));
555 case BLKRASET:
556 case BLKFRASET:
557 if(!capable(CAP_SYS_ADMIN))
558 return -EACCES;
559 bdev->bd_disk->bdi->ra_pages = (arg * 512) / PAGE_SIZE;
560 return 0;
561 case BLKRRPART:
562 if (!capable(CAP_SYS_ADMIN))
563 return -EACCES;
564 if (bdev_is_partition(bdev))
565 return -EINVAL;
566 return disk_scan_partitions(bdev->bd_disk,
567 mode | BLK_OPEN_STRICT_SCAN);
568 case BLKTRACESTART:
569 case BLKTRACESTOP:
570 case BLKTRACETEARDOWN:
571 return blk_trace_ioctl(bdev, cmd, argp);
572 case IOC_PR_REGISTER:
573 return blkdev_pr_register(bdev, mode, argp);
574 case IOC_PR_RESERVE:
575 return blkdev_pr_reserve(bdev, mode, argp);
576 case IOC_PR_RELEASE:
577 return blkdev_pr_release(bdev, mode, argp);
578 case IOC_PR_PREEMPT:
579 return blkdev_pr_preempt(bdev, mode, argp, false);
580 case IOC_PR_PREEMPT_ABORT:
581 return blkdev_pr_preempt(bdev, mode, argp, true);
582 case IOC_PR_CLEAR:
583 return blkdev_pr_clear(bdev, mode, argp);
584 default:
585 return -ENOIOCTLCMD;
586 }
587}
588
589/*
590 * Always keep this in sync with compat_blkdev_ioctl()
591 * to handle all incompatible commands in both functions.
592 *
593 * New commands must be compatible and go into blkdev_common_ioctl
594 */
595long blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
596{
597 struct block_device *bdev = I_BDEV(file->f_mapping->host);
598 void __user *argp = (void __user *)arg;
599 blk_mode_t mode = file_to_blk_mode(file);
600 int ret;
601
602 switch (cmd) {
603 /* These need separate implementations for the data structure */
604 case HDIO_GETGEO:
605 return blkdev_getgeo(bdev, argp);
606 case BLKPG:
607 return blkpg_ioctl(bdev, argp);
608
609 /* Compat mode returns 32-bit data instead of 'long' */
610 case BLKRAGET:
611 case BLKFRAGET:
612 if (!argp)
613 return -EINVAL;
614 return put_long(argp,
615 (bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512);
616 case BLKGETSIZE:
617 if (bdev_nr_sectors(bdev) > ~0UL)
618 return -EFBIG;
619 return put_ulong(argp, bdev_nr_sectors(bdev));
620
621 /* The data is compatible, but the command number is different */
622 case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
623 return put_int(argp, block_size(bdev));
624 case BLKBSZSET:
625 return blkdev_bszset(bdev, mode, argp);
626 case BLKGETSIZE64:
627 return put_u64(argp, bdev_nr_bytes(bdev));
628
629 /* Incompatible alignment on i386 */
630 case BLKTRACESETUP:
631 return blk_trace_ioctl(bdev, cmd, argp);
632 default:
633 break;
634 }
635
636 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
637 if (ret != -ENOIOCTLCMD)
638 return ret;
639
640 if (!bdev->bd_disk->fops->ioctl)
641 return -ENOTTY;
642 return bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg);
643}
644
645#ifdef CONFIG_COMPAT
646
647#define BLKBSZGET_32 _IOR(0x12, 112, int)
648#define BLKBSZSET_32 _IOW(0x12, 113, int)
649#define BLKGETSIZE64_32 _IOR(0x12, 114, int)
650
651/* Most of the generic ioctls are handled in the normal fallback path.
652 This assumes the blkdev's low level compat_ioctl always returns
653 ENOIOCTLCMD for unknown ioctls. */
654long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
655{
656 int ret;
657 void __user *argp = compat_ptr(arg);
658 struct block_device *bdev = I_BDEV(file->f_mapping->host);
659 struct gendisk *disk = bdev->bd_disk;
660 blk_mode_t mode = file_to_blk_mode(file);
661
662 switch (cmd) {
663 /* These need separate implementations for the data structure */
664 case HDIO_GETGEO:
665 return compat_hdio_getgeo(bdev, argp);
666 case BLKPG:
667 return compat_blkpg_ioctl(bdev, argp);
668
669 /* Compat mode returns 32-bit data instead of 'long' */
670 case BLKRAGET:
671 case BLKFRAGET:
672 if (!argp)
673 return -EINVAL;
674 return compat_put_long(argp,
675 (bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512);
676 case BLKGETSIZE:
677 if (bdev_nr_sectors(bdev) > ~(compat_ulong_t)0)
678 return -EFBIG;
679 return compat_put_ulong(argp, bdev_nr_sectors(bdev));
680
681 /* The data is compatible, but the command number is different */
682 case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
683 return put_int(argp, bdev_logical_block_size(bdev));
684 case BLKBSZSET_32:
685 return blkdev_bszset(bdev, mode, argp);
686 case BLKGETSIZE64_32:
687 return put_u64(argp, bdev_nr_bytes(bdev));
688
689 /* Incompatible alignment on i386 */
690 case BLKTRACESETUP32:
691 return blk_trace_ioctl(bdev, cmd, argp);
692 default:
693 break;
694 }
695
696 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
697 if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
698 ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
699
700 return ret;
701}
702#endif