add debugging code
[cor.git] / block / ioctl.c
blob5de98b97af2a0c7b4db99ea6ed72c8081edd5cce
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>
14 static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user *arg)
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;
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;
49 /* check if partition is aligned to blocksize */
50 if (p.start & (bdev_logical_block_size(bdev) - 1))
51 return -EINVAL;
53 mutex_lock(&bdev->bd_mutex);
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;
66 disk_part_iter_exit(&piter);
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;
78 bdevp = bdget(part_devt(part));
79 disk_put_part(part);
80 if (!bdevp)
81 return -ENOMEM;
83 mutex_lock(&bdevp->bd_mutex);
84 if (bdevp->bd_openers) {
85 mutex_unlock(&bdevp->bd_mutex);
86 bdput(bdevp);
87 return -EBUSY;
89 /* all seems OK */
90 fsync_bdev(bdevp);
91 invalidate_bdev(bdevp);
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);
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;
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;
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;
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)
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;
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;
158 static int blkdev_reread_part(struct block_device *bdev)
160 int ret;
162 if (!disk_part_scan_enabled(bdev->bd_disk) || bdev != bdev->bd_contains)
163 return -EINVAL;
164 if (!capable(CAP_SYS_ADMIN))
165 return -EACCES;
167 mutex_lock(&bdev->bd_mutex);
168 ret = bdev_disk_changed(bdev, false);
169 mutex_unlock(&bdev->bd_mutex);
171 return ret;
174 static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode,
175 unsigned long arg, unsigned long flags)
177 uint64_t range[2];
178 uint64_t start, len;
179 struct request_queue *q = bdev_get_queue(bdev);
180 struct address_space *mapping = bdev->bd_inode->i_mapping;
183 if (!(mode & FMODE_WRITE))
184 return -EBADF;
186 if (!blk_queue_discard(q))
187 return -EOPNOTSUPP;
189 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
190 return -EFAULT;
192 start = range[0];
193 len = range[1];
195 if (start & 511)
196 return -EINVAL;
197 if (len & 511)
198 return -EINVAL;
200 if (start + len > i_size_read(bdev->bd_inode))
201 return -EINVAL;
202 truncate_inode_pages_range(mapping, start, start + len - 1);
203 return blkdev_issue_discard(bdev, start >> 9, len >> 9,
204 GFP_KERNEL, flags);
207 static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode,
208 unsigned long arg)
210 uint64_t range[2];
211 struct address_space *mapping;
212 uint64_t start, end, len;
214 if (!(mode & FMODE_WRITE))
215 return -EBADF;
217 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
218 return -EFAULT;
220 start = range[0];
221 len = range[1];
222 end = start + len - 1;
224 if (start & 511)
225 return -EINVAL;
226 if (len & 511)
227 return -EINVAL;
228 if (end >= (uint64_t)i_size_read(bdev->bd_inode))
229 return -EINVAL;
230 if (end < start)
231 return -EINVAL;
233 /* Invalidate the page cache, including dirty pages */
234 mapping = bdev->bd_inode->i_mapping;
235 truncate_inode_pages_range(mapping, start, end);
237 return blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL,
238 BLKDEV_ZERO_NOUNMAP);
241 static int put_ushort(unsigned long arg, unsigned short val)
243 return put_user(val, (unsigned short __user *)arg);
246 static int put_int(unsigned long arg, int val)
248 return put_user(val, (int __user *)arg);
251 static int put_uint(unsigned long arg, unsigned int val)
253 return put_user(val, (unsigned int __user *)arg);
256 static int put_long(unsigned long arg, long val)
258 return put_user(val, (long __user *)arg);
261 static int put_ulong(unsigned long arg, unsigned long val)
263 return put_user(val, (unsigned long __user *)arg);
266 static int put_u64(unsigned long arg, u64 val)
268 return put_user(val, (u64 __user *)arg);
271 int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
272 unsigned cmd, unsigned long arg)
274 struct gendisk *disk = bdev->bd_disk;
276 if (disk->fops->ioctl)
277 return disk->fops->ioctl(bdev, mode, cmd, arg);
279 return -ENOTTY;
282 * For the record: _GPL here is only because somebody decided to slap it
283 * on the previous export. Sheer idiocy, since it wasn't copyrightable
284 * at all and could be open-coded without any exports by anybody who cares.
286 EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl);
288 static int blkdev_pr_register(struct block_device *bdev,
289 struct pr_registration __user *arg)
291 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
292 struct pr_registration reg;
294 if (!capable(CAP_SYS_ADMIN))
295 return -EPERM;
296 if (!ops || !ops->pr_register)
297 return -EOPNOTSUPP;
298 if (copy_from_user(&reg, arg, sizeof(reg)))
299 return -EFAULT;
301 if (reg.flags & ~PR_FL_IGNORE_KEY)
302 return -EOPNOTSUPP;
303 return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags);
306 static int blkdev_pr_reserve(struct block_device *bdev,
307 struct pr_reservation __user *arg)
309 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
310 struct pr_reservation rsv;
312 if (!capable(CAP_SYS_ADMIN))
313 return -EPERM;
314 if (!ops || !ops->pr_reserve)
315 return -EOPNOTSUPP;
316 if (copy_from_user(&rsv, arg, sizeof(rsv)))
317 return -EFAULT;
319 if (rsv.flags & ~PR_FL_IGNORE_KEY)
320 return -EOPNOTSUPP;
321 return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags);
324 static int blkdev_pr_release(struct block_device *bdev,
325 struct pr_reservation __user *arg)
327 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
328 struct pr_reservation rsv;
330 if (!capable(CAP_SYS_ADMIN))
331 return -EPERM;
332 if (!ops || !ops->pr_release)
333 return -EOPNOTSUPP;
334 if (copy_from_user(&rsv, arg, sizeof(rsv)))
335 return -EFAULT;
337 if (rsv.flags)
338 return -EOPNOTSUPP;
339 return ops->pr_release(bdev, rsv.key, rsv.type);
342 static int blkdev_pr_preempt(struct block_device *bdev,
343 struct pr_preempt __user *arg, bool abort)
345 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
346 struct pr_preempt p;
348 if (!capable(CAP_SYS_ADMIN))
349 return -EPERM;
350 if (!ops || !ops->pr_preempt)
351 return -EOPNOTSUPP;
352 if (copy_from_user(&p, arg, sizeof(p)))
353 return -EFAULT;
355 if (p.flags)
356 return -EOPNOTSUPP;
357 return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort);
360 static int blkdev_pr_clear(struct block_device *bdev,
361 struct pr_clear __user *arg)
363 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
364 struct pr_clear c;
366 if (!capable(CAP_SYS_ADMIN))
367 return -EPERM;
368 if (!ops || !ops->pr_clear)
369 return -EOPNOTSUPP;
370 if (copy_from_user(&c, arg, sizeof(c)))
371 return -EFAULT;
373 if (c.flags)
374 return -EOPNOTSUPP;
375 return ops->pr_clear(bdev, c.key);
379 * Is it an unrecognized ioctl? The correct returns are either
380 * ENOTTY (final) or ENOIOCTLCMD ("I don't know this one, try a
381 * fallback"). ENOIOCTLCMD gets turned into ENOTTY by the ioctl
382 * code before returning.
384 * Confused drivers sometimes return EINVAL, which is wrong. It
385 * means "I understood the ioctl command, but the parameters to
386 * it were wrong".
388 * We should aim to just fix the broken drivers, the EINVAL case
389 * should go away.
391 static inline int is_unrecognized_ioctl(int ret)
393 return ret == -EINVAL ||
394 ret == -ENOTTY ||
395 ret == -ENOIOCTLCMD;
398 static int blkdev_flushbuf(struct block_device *bdev, fmode_t mode,
399 unsigned cmd, unsigned long arg)
401 int ret;
403 if (!capable(CAP_SYS_ADMIN))
404 return -EACCES;
406 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
407 if (!is_unrecognized_ioctl(ret))
408 return ret;
410 fsync_bdev(bdev);
411 invalidate_bdev(bdev);
412 return 0;
415 static int blkdev_roset(struct block_device *bdev, fmode_t mode,
416 unsigned cmd, unsigned long arg)
418 int ret, n;
420 if (!capable(CAP_SYS_ADMIN))
421 return -EACCES;
423 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
424 if (!is_unrecognized_ioctl(ret))
425 return ret;
426 if (get_user(n, (int __user *)arg))
427 return -EFAULT;
428 set_device_ro(bdev, n);
429 return 0;
432 static int blkdev_getgeo(struct block_device *bdev,
433 struct hd_geometry __user *argp)
435 struct gendisk *disk = bdev->bd_disk;
436 struct hd_geometry geo;
437 int ret;
439 if (!argp)
440 return -EINVAL;
441 if (!disk->fops->getgeo)
442 return -ENOTTY;
445 * We need to set the startsect first, the driver may
446 * want to override it.
448 memset(&geo, 0, sizeof(geo));
449 geo.start = get_start_sect(bdev);
450 ret = disk->fops->getgeo(bdev, &geo);
451 if (ret)
452 return ret;
453 if (copy_to_user(argp, &geo, sizeof(geo)))
454 return -EFAULT;
455 return 0;
458 /* set the logical block size */
459 static int blkdev_bszset(struct block_device *bdev, fmode_t mode,
460 int __user *argp)
462 int ret, n;
464 if (!capable(CAP_SYS_ADMIN))
465 return -EACCES;
466 if (!argp)
467 return -EINVAL;
468 if (get_user(n, argp))
469 return -EFAULT;
471 if (!(mode & FMODE_EXCL)) {
472 bdgrab(bdev);
473 if (blkdev_get(bdev, mode | FMODE_EXCL, &bdev) < 0)
474 return -EBUSY;
477 ret = set_blocksize(bdev, n);
478 if (!(mode & FMODE_EXCL))
479 blkdev_put(bdev, mode | FMODE_EXCL);
480 return ret;
484 * always keep this in sync with compat_blkdev_ioctl()
486 int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
487 unsigned long arg)
489 void __user *argp = (void __user *)arg;
490 loff_t size;
491 unsigned int max_sectors;
493 switch (cmd) {
494 case BLKFLSBUF:
495 return blkdev_flushbuf(bdev, mode, cmd, arg);
496 case BLKROSET:
497 return blkdev_roset(bdev, mode, cmd, arg);
498 case BLKDISCARD:
499 return blk_ioctl_discard(bdev, mode, arg, 0);
500 case BLKSECDISCARD:
501 return blk_ioctl_discard(bdev, mode, arg,
502 BLKDEV_DISCARD_SECURE);
503 case BLKZEROOUT:
504 return blk_ioctl_zeroout(bdev, mode, arg);
505 case BLKREPORTZONE:
506 return blkdev_report_zones_ioctl(bdev, mode, cmd, arg);
507 case BLKRESETZONE:
508 case BLKOPENZONE:
509 case BLKCLOSEZONE:
510 case BLKFINISHZONE:
511 return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg);
512 case BLKGETZONESZ:
513 return put_uint(arg, bdev_zone_sectors(bdev));
514 case BLKGETNRZONES:
515 return put_uint(arg, blkdev_nr_zones(bdev->bd_disk));
516 case HDIO_GETGEO:
517 return blkdev_getgeo(bdev, argp);
518 case BLKRAGET:
519 case BLKFRAGET:
520 if (!arg)
521 return -EINVAL;
522 return put_long(arg, (bdev->bd_bdi->ra_pages*PAGE_SIZE) / 512);
523 case BLKROGET:
524 return put_int(arg, bdev_read_only(bdev) != 0);
525 case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
526 return put_int(arg, block_size(bdev));
527 case BLKSSZGET: /* get block device logical block size */
528 return put_int(arg, bdev_logical_block_size(bdev));
529 case BLKPBSZGET: /* get block device physical block size */
530 return put_uint(arg, bdev_physical_block_size(bdev));
531 case BLKIOMIN:
532 return put_uint(arg, bdev_io_min(bdev));
533 case BLKIOOPT:
534 return put_uint(arg, bdev_io_opt(bdev));
535 case BLKALIGNOFF:
536 return put_int(arg, bdev_alignment_offset(bdev));
537 case BLKDISCARDZEROES:
538 return put_uint(arg, 0);
539 case BLKSECTGET:
540 max_sectors = min_t(unsigned int, USHRT_MAX,
541 queue_max_sectors(bdev_get_queue(bdev)));
542 return put_ushort(arg, max_sectors);
543 case BLKROTATIONAL:
544 return put_ushort(arg, !blk_queue_nonrot(bdev_get_queue(bdev)));
545 case BLKRASET:
546 case BLKFRASET:
547 if(!capable(CAP_SYS_ADMIN))
548 return -EACCES;
549 bdev->bd_bdi->ra_pages = (arg * 512) / PAGE_SIZE;
550 return 0;
551 case BLKBSZSET:
552 return blkdev_bszset(bdev, mode, argp);
553 case BLKPG:
554 return blkpg_ioctl(bdev, argp);
555 case BLKRRPART:
556 return blkdev_reread_part(bdev);
557 case BLKGETSIZE:
558 size = i_size_read(bdev->bd_inode);
559 if ((size >> 9) > ~0UL)
560 return -EFBIG;
561 return put_ulong(arg, size >> 9);
562 case BLKGETSIZE64:
563 return put_u64(arg, i_size_read(bdev->bd_inode));
564 case BLKTRACESTART:
565 case BLKTRACESTOP:
566 case BLKTRACESETUP:
567 case BLKTRACETEARDOWN:
568 return blk_trace_ioctl(bdev, cmd, argp);
569 case IOC_PR_REGISTER:
570 return blkdev_pr_register(bdev, argp);
571 case IOC_PR_RESERVE:
572 return blkdev_pr_reserve(bdev, argp);
573 case IOC_PR_RELEASE:
574 return blkdev_pr_release(bdev, argp);
575 case IOC_PR_PREEMPT:
576 return blkdev_pr_preempt(bdev, argp, false);
577 case IOC_PR_PREEMPT_ABORT:
578 return blkdev_pr_preempt(bdev, argp, true);
579 case IOC_PR_CLEAR:
580 return blkdev_pr_clear(bdev, argp);
581 default:
582 return __blkdev_driver_ioctl(bdev, mode, cmd, arg);
585 EXPORT_SYMBOL_GPL(blkdev_ioctl);