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
blkpg_do_ioctl(struct block_device * bdev,struct blkpg_partition __user * upart,int op)16 static 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_is_partition(bdev))
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
blkpg_ioctl(struct block_device * bdev,struct blkpg_ioctl_arg __user * arg)60 static 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
73 struct 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
compat_blkpg_ioctl(struct block_device * bdev,struct compat_blkpg_ioctl_arg __user * arg)80 static 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
blkdev_reread_part(struct block_device * bdev)93 static int blkdev_reread_part(struct block_device *bdev)
94 {
95 int ret;
96
97 if (!disk_part_scan_enabled(bdev->bd_disk) || bdev_is_partition(bdev))
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
blk_ioctl_discard(struct block_device * bdev,fmode_t mode,unsigned long arg,unsigned long flags)109 static 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 int err;
116
117 if (!(mode & FMODE_WRITE))
118 return -EBADF;
119
120 if (!blk_queue_discard(q))
121 return -EOPNOTSUPP;
122
123 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
124 return -EFAULT;
125
126 start = range[0];
127 len = range[1];
128
129 if (start & 511)
130 return -EINVAL;
131 if (len & 511)
132 return -EINVAL;
133
134 if (start + len > i_size_read(bdev->bd_inode))
135 return -EINVAL;
136
137 err = truncate_bdev_range(bdev, mode, start, start + len - 1);
138 if (err)
139 return err;
140
141 return blkdev_issue_discard(bdev, start >> 9, len >> 9,
142 GFP_KERNEL, flags);
143 }
144
blk_ioctl_zeroout(struct block_device * bdev,fmode_t mode,unsigned long arg)145 static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode,
146 unsigned long arg)
147 {
148 uint64_t range[2];
149 uint64_t start, end, len;
150 int err;
151
152 if (!(mode & FMODE_WRITE))
153 return -EBADF;
154
155 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
156 return -EFAULT;
157
158 start = range[0];
159 len = range[1];
160 end = start + len - 1;
161
162 if (start & 511)
163 return -EINVAL;
164 if (len & 511)
165 return -EINVAL;
166 if (end >= (uint64_t)i_size_read(bdev->bd_inode))
167 return -EINVAL;
168 if (end < start)
169 return -EINVAL;
170
171 /* Invalidate the page cache, including dirty pages */
172 err = truncate_bdev_range(bdev, mode, start, end);
173 if (err)
174 return err;
175
176 return blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL,
177 BLKDEV_ZERO_NOUNMAP);
178 }
179
put_ushort(unsigned short __user * argp,unsigned short val)180 static int put_ushort(unsigned short __user *argp, unsigned short val)
181 {
182 return put_user(val, argp);
183 }
184
put_int(int __user * argp,int val)185 static int put_int(int __user *argp, int val)
186 {
187 return put_user(val, argp);
188 }
189
put_uint(unsigned int __user * argp,unsigned int val)190 static int put_uint(unsigned int __user *argp, unsigned int val)
191 {
192 return put_user(val, argp);
193 }
194
put_long(long __user * argp,long val)195 static int put_long(long __user *argp, long val)
196 {
197 return put_user(val, argp);
198 }
199
put_ulong(unsigned long __user * argp,unsigned long val)200 static int put_ulong(unsigned long __user *argp, unsigned long val)
201 {
202 return put_user(val, argp);
203 }
204
put_u64(u64 __user * argp,u64 val)205 static int put_u64(u64 __user *argp, u64 val)
206 {
207 return put_user(val, argp);
208 }
209
210 #ifdef CONFIG_COMPAT
compat_put_long(compat_long_t __user * argp,long val)211 static int compat_put_long(compat_long_t __user *argp, long val)
212 {
213 return put_user(val, argp);
214 }
215
compat_put_ulong(compat_ulong_t __user * argp,compat_ulong_t val)216 static int compat_put_ulong(compat_ulong_t __user *argp, compat_ulong_t val)
217 {
218 return put_user(val, argp);
219 }
220 #endif
221
__blkdev_driver_ioctl(struct block_device * bdev,fmode_t mode,unsigned cmd,unsigned long arg)222 int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
223 unsigned cmd, unsigned long arg)
224 {
225 struct gendisk *disk = bdev->bd_disk;
226
227 if (disk->fops->ioctl)
228 return disk->fops->ioctl(bdev, mode, cmd, arg);
229
230 return -ENOTTY;
231 }
232 /*
233 * For the record: _GPL here is only because somebody decided to slap it
234 * on the previous export. Sheer idiocy, since it wasn't copyrightable
235 * at all and could be open-coded without any exports by anybody who cares.
236 */
237 EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl);
238
239 #ifdef CONFIG_COMPAT
240 /*
241 * This is the equivalent of compat_ptr_ioctl(), to be used by block
242 * drivers that implement only commands that are completely compatible
243 * between 32-bit and 64-bit user space
244 */
blkdev_compat_ptr_ioctl(struct block_device * bdev,fmode_t mode,unsigned cmd,unsigned long arg)245 int blkdev_compat_ptr_ioctl(struct block_device *bdev, fmode_t mode,
246 unsigned cmd, unsigned long arg)
247 {
248 struct gendisk *disk = bdev->bd_disk;
249
250 if (disk->fops->ioctl)
251 return disk->fops->ioctl(bdev, mode, cmd,
252 (unsigned long)compat_ptr(arg));
253
254 return -ENOIOCTLCMD;
255 }
256 EXPORT_SYMBOL(blkdev_compat_ptr_ioctl);
257 #endif
258
blkdev_pr_register(struct block_device * bdev,struct pr_registration __user * arg)259 static int blkdev_pr_register(struct block_device *bdev,
260 struct pr_registration __user *arg)
261 {
262 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
263 struct pr_registration reg;
264
265 if (!capable(CAP_SYS_ADMIN))
266 return -EPERM;
267 if (!ops || !ops->pr_register)
268 return -EOPNOTSUPP;
269 if (copy_from_user(®, arg, sizeof(reg)))
270 return -EFAULT;
271
272 if (reg.flags & ~PR_FL_IGNORE_KEY)
273 return -EOPNOTSUPP;
274 return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags);
275 }
276
blkdev_pr_reserve(struct block_device * bdev,struct pr_reservation __user * arg)277 static int blkdev_pr_reserve(struct block_device *bdev,
278 struct pr_reservation __user *arg)
279 {
280 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
281 struct pr_reservation rsv;
282
283 if (!capable(CAP_SYS_ADMIN))
284 return -EPERM;
285 if (!ops || !ops->pr_reserve)
286 return -EOPNOTSUPP;
287 if (copy_from_user(&rsv, arg, sizeof(rsv)))
288 return -EFAULT;
289
290 if (rsv.flags & ~PR_FL_IGNORE_KEY)
291 return -EOPNOTSUPP;
292 return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags);
293 }
294
blkdev_pr_release(struct block_device * bdev,struct pr_reservation __user * arg)295 static int blkdev_pr_release(struct block_device *bdev,
296 struct pr_reservation __user *arg)
297 {
298 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
299 struct pr_reservation rsv;
300
301 if (!capable(CAP_SYS_ADMIN))
302 return -EPERM;
303 if (!ops || !ops->pr_release)
304 return -EOPNOTSUPP;
305 if (copy_from_user(&rsv, arg, sizeof(rsv)))
306 return -EFAULT;
307
308 if (rsv.flags)
309 return -EOPNOTSUPP;
310 return ops->pr_release(bdev, rsv.key, rsv.type);
311 }
312
blkdev_pr_preempt(struct block_device * bdev,struct pr_preempt __user * arg,bool abort)313 static int blkdev_pr_preempt(struct block_device *bdev,
314 struct pr_preempt __user *arg, bool abort)
315 {
316 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
317 struct pr_preempt p;
318
319 if (!capable(CAP_SYS_ADMIN))
320 return -EPERM;
321 if (!ops || !ops->pr_preempt)
322 return -EOPNOTSUPP;
323 if (copy_from_user(&p, arg, sizeof(p)))
324 return -EFAULT;
325
326 if (p.flags)
327 return -EOPNOTSUPP;
328 return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort);
329 }
330
blkdev_pr_clear(struct block_device * bdev,struct pr_clear __user * arg)331 static int blkdev_pr_clear(struct block_device *bdev,
332 struct pr_clear __user *arg)
333 {
334 const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
335 struct pr_clear c;
336
337 if (!capable(CAP_SYS_ADMIN))
338 return -EPERM;
339 if (!ops || !ops->pr_clear)
340 return -EOPNOTSUPP;
341 if (copy_from_user(&c, arg, sizeof(c)))
342 return -EFAULT;
343
344 if (c.flags)
345 return -EOPNOTSUPP;
346 return ops->pr_clear(bdev, c.key);
347 }
348
349 /*
350 * Is it an unrecognized ioctl? The correct returns are either
351 * ENOTTY (final) or ENOIOCTLCMD ("I don't know this one, try a
352 * fallback"). ENOIOCTLCMD gets turned into ENOTTY by the ioctl
353 * code before returning.
354 *
355 * Confused drivers sometimes return EINVAL, which is wrong. It
356 * means "I understood the ioctl command, but the parameters to
357 * it were wrong".
358 *
359 * We should aim to just fix the broken drivers, the EINVAL case
360 * should go away.
361 */
is_unrecognized_ioctl(int ret)362 static inline int is_unrecognized_ioctl(int ret)
363 {
364 return ret == -EINVAL ||
365 ret == -ENOTTY ||
366 ret == -ENOIOCTLCMD;
367 }
368
blkdev_flushbuf(struct block_device * bdev,fmode_t mode,unsigned cmd,unsigned long arg)369 static int blkdev_flushbuf(struct block_device *bdev, fmode_t mode,
370 unsigned cmd, unsigned long arg)
371 {
372 int ret;
373
374 if (!capable(CAP_SYS_ADMIN))
375 return -EACCES;
376
377 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
378 if (!is_unrecognized_ioctl(ret))
379 return ret;
380
381 fsync_bdev(bdev);
382 invalidate_bdev(bdev);
383 return 0;
384 }
385
blkdev_roset(struct block_device * bdev,fmode_t mode,unsigned cmd,unsigned long arg)386 static int blkdev_roset(struct block_device *bdev, fmode_t mode,
387 unsigned cmd, unsigned long arg)
388 {
389 int ret, n;
390
391 if (!capable(CAP_SYS_ADMIN))
392 return -EACCES;
393
394 ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
395 if (!is_unrecognized_ioctl(ret))
396 return ret;
397 if (get_user(n, (int __user *)arg))
398 return -EFAULT;
399 set_device_ro(bdev, n);
400 return 0;
401 }
402
blkdev_getgeo(struct block_device * bdev,struct hd_geometry __user * argp)403 static int blkdev_getgeo(struct block_device *bdev,
404 struct hd_geometry __user *argp)
405 {
406 struct gendisk *disk = bdev->bd_disk;
407 struct hd_geometry geo;
408 int ret;
409
410 if (!argp)
411 return -EINVAL;
412 if (!disk->fops->getgeo)
413 return -ENOTTY;
414
415 /*
416 * We need to set the startsect first, the driver may
417 * want to override it.
418 */
419 memset(&geo, 0, sizeof(geo));
420 geo.start = get_start_sect(bdev);
421 ret = disk->fops->getgeo(bdev, &geo);
422 if (ret)
423 return ret;
424 if (copy_to_user(argp, &geo, sizeof(geo)))
425 return -EFAULT;
426 return 0;
427 }
428
429 #ifdef CONFIG_COMPAT
430 struct compat_hd_geometry {
431 unsigned char heads;
432 unsigned char sectors;
433 unsigned short cylinders;
434 u32 start;
435 };
436
compat_hdio_getgeo(struct block_device * bdev,struct compat_hd_geometry __user * ugeo)437 static int compat_hdio_getgeo(struct block_device *bdev,
438 struct compat_hd_geometry __user *ugeo)
439 {
440 struct gendisk *disk = bdev->bd_disk;
441 struct hd_geometry geo;
442 int ret;
443
444 if (!ugeo)
445 return -EINVAL;
446 if (!disk->fops->getgeo)
447 return -ENOTTY;
448
449 memset(&geo, 0, sizeof(geo));
450 /*
451 * We need to set the startsect first, the driver may
452 * want to override it.
453 */
454 geo.start = get_start_sect(bdev);
455 ret = disk->fops->getgeo(bdev, &geo);
456 if (ret)
457 return ret;
458
459 ret = copy_to_user(ugeo, &geo, 4);
460 ret |= put_user(geo.start, &ugeo->start);
461 if (ret)
462 ret = -EFAULT;
463
464 return ret;
465 }
466 #endif
467
468 /* set the logical block size */
blkdev_bszset(struct block_device * bdev,fmode_t mode,int __user * argp)469 static int blkdev_bszset(struct block_device *bdev, fmode_t mode,
470 int __user *argp)
471 {
472 int ret, n;
473
474 if (!capable(CAP_SYS_ADMIN))
475 return -EACCES;
476 if (!argp)
477 return -EINVAL;
478 if (get_user(n, argp))
479 return -EFAULT;
480
481 if (mode & FMODE_EXCL)
482 return set_blocksize(bdev, n);
483
484 if (IS_ERR(blkdev_get_by_dev(bdev->bd_dev, mode | FMODE_EXCL, &bdev)))
485 return -EBUSY;
486 ret = set_blocksize(bdev, n);
487 blkdev_put(bdev, mode | FMODE_EXCL);
488
489 return ret;
490 }
491
492 /*
493 * Common commands that are handled the same way on native and compat
494 * user space. Note the separate arg/argp parameters that are needed
495 * to deal with the compat_ptr() conversion.
496 */
blkdev_common_ioctl(struct block_device * bdev,fmode_t mode,unsigned cmd,unsigned long arg,void __user * argp)497 static int blkdev_common_ioctl(struct block_device *bdev, fmode_t mode,
498 unsigned cmd, unsigned long arg, void __user *argp)
499 {
500 unsigned int max_sectors;
501
502 switch (cmd) {
503 case BLKFLSBUF:
504 return blkdev_flushbuf(bdev, mode, cmd, arg);
505 case BLKROSET:
506 return blkdev_roset(bdev, mode, cmd, arg);
507 case BLKDISCARD:
508 return blk_ioctl_discard(bdev, mode, arg, 0);
509 case BLKSECDISCARD:
510 return blk_ioctl_discard(bdev, mode, arg,
511 BLKDEV_DISCARD_SECURE);
512 case BLKZEROOUT:
513 return blk_ioctl_zeroout(bdev, mode, arg);
514 case BLKREPORTZONE:
515 return blkdev_report_zones_ioctl(bdev, mode, cmd, arg);
516 case BLKRESETZONE:
517 case BLKOPENZONE:
518 case BLKCLOSEZONE:
519 case BLKFINISHZONE:
520 return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg);
521 case BLKGETZONESZ:
522 return put_uint(argp, bdev_zone_sectors(bdev));
523 case BLKGETNRZONES:
524 return put_uint(argp, blkdev_nr_zones(bdev->bd_disk));
525 case BLKROGET:
526 return put_int(argp, bdev_read_only(bdev) != 0);
527 case BLKSSZGET: /* get block device logical block size */
528 return put_int(argp, bdev_logical_block_size(bdev));
529 case BLKPBSZGET: /* get block device physical block size */
530 return put_uint(argp, bdev_physical_block_size(bdev));
531 case BLKIOMIN:
532 return put_uint(argp, bdev_io_min(bdev));
533 case BLKIOOPT:
534 return put_uint(argp, bdev_io_opt(bdev));
535 case BLKALIGNOFF:
536 return put_int(argp, bdev_alignment_offset(bdev));
537 case BLKDISCARDZEROES:
538 return put_uint(argp, 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(argp, max_sectors);
543 case BLKROTATIONAL:
544 return put_ushort(argp, !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 BLKRRPART:
552 return blkdev_reread_part(bdev);
553 case BLKTRACESTART:
554 case BLKTRACESTOP:
555 case BLKTRACETEARDOWN:
556 return blk_trace_ioctl(bdev, cmd, argp);
557 case IOC_PR_REGISTER:
558 return blkdev_pr_register(bdev, argp);
559 case IOC_PR_RESERVE:
560 return blkdev_pr_reserve(bdev, argp);
561 case IOC_PR_RELEASE:
562 return blkdev_pr_release(bdev, argp);
563 case IOC_PR_PREEMPT:
564 return blkdev_pr_preempt(bdev, argp, false);
565 case IOC_PR_PREEMPT_ABORT:
566 return blkdev_pr_preempt(bdev, argp, true);
567 case IOC_PR_CLEAR:
568 return blkdev_pr_clear(bdev, argp);
569 default:
570 return -ENOIOCTLCMD;
571 }
572 }
573
574 /*
575 * Always keep this in sync with compat_blkdev_ioctl()
576 * to handle all incompatible commands in both functions.
577 *
578 * New commands must be compatible and go into blkdev_common_ioctl
579 */
blkdev_ioctl(struct block_device * bdev,fmode_t mode,unsigned cmd,unsigned long arg)580 int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
581 unsigned long arg)
582 {
583 int ret;
584 loff_t size;
585 void __user *argp = (void __user *)arg;
586
587 switch (cmd) {
588 /* These need separate implementations for the data structure */
589 case HDIO_GETGEO:
590 return blkdev_getgeo(bdev, argp);
591 case BLKPG:
592 return blkpg_ioctl(bdev, argp);
593
594 /* Compat mode returns 32-bit data instead of 'long' */
595 case BLKRAGET:
596 case BLKFRAGET:
597 if (!argp)
598 return -EINVAL;
599 return put_long(argp, (bdev->bd_bdi->ra_pages*PAGE_SIZE) / 512);
600 case BLKGETSIZE:
601 size = i_size_read(bdev->bd_inode);
602 if ((size >> 9) > ~0UL)
603 return -EFBIG;
604 return put_ulong(argp, size >> 9);
605
606 /* The data is compatible, but the command number is different */
607 case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
608 return put_int(argp, block_size(bdev));
609 case BLKBSZSET:
610 return blkdev_bszset(bdev, mode, argp);
611 case BLKGETSIZE64:
612 return put_u64(argp, i_size_read(bdev->bd_inode));
613
614 /* Incompatible alignment on i386 */
615 case BLKTRACESETUP:
616 return blk_trace_ioctl(bdev, cmd, argp);
617 default:
618 break;
619 }
620
621 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
622 if (ret == -ENOIOCTLCMD)
623 return __blkdev_driver_ioctl(bdev, mode, cmd, arg);
624
625 return ret;
626 }
627 EXPORT_SYMBOL_GPL(blkdev_ioctl); /* for /dev/raw */
628
629 #ifdef CONFIG_COMPAT
630
631 #define BLKBSZGET_32 _IOR(0x12, 112, int)
632 #define BLKBSZSET_32 _IOW(0x12, 113, int)
633 #define BLKGETSIZE64_32 _IOR(0x12, 114, int)
634
635 /* Most of the generic ioctls are handled in the normal fallback path.
636 This assumes the blkdev's low level compat_ioctl always returns
637 ENOIOCTLCMD for unknown ioctls. */
compat_blkdev_ioctl(struct file * file,unsigned cmd,unsigned long arg)638 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
639 {
640 int ret;
641 void __user *argp = compat_ptr(arg);
642 struct inode *inode = file->f_mapping->host;
643 struct block_device *bdev = inode->i_bdev;
644 struct gendisk *disk = bdev->bd_disk;
645 fmode_t mode = file->f_mode;
646 loff_t size;
647
648 /*
649 * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
650 * to updated it before every ioctl.
651 */
652 if (file->f_flags & O_NDELAY)
653 mode |= FMODE_NDELAY;
654 else
655 mode &= ~FMODE_NDELAY;
656
657 switch (cmd) {
658 /* These need separate implementations for the data structure */
659 case HDIO_GETGEO:
660 return compat_hdio_getgeo(bdev, argp);
661 case BLKPG:
662 return compat_blkpg_ioctl(bdev, argp);
663
664 /* Compat mode returns 32-bit data instead of 'long' */
665 case BLKRAGET:
666 case BLKFRAGET:
667 if (!argp)
668 return -EINVAL;
669 return compat_put_long(argp,
670 (bdev->bd_bdi->ra_pages * PAGE_SIZE) / 512);
671 case BLKGETSIZE:
672 size = i_size_read(bdev->bd_inode);
673 if ((size >> 9) > ~0UL)
674 return -EFBIG;
675 return compat_put_ulong(argp, size >> 9);
676
677 /* The data is compatible, but the command number is different */
678 case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
679 return put_int(argp, bdev_logical_block_size(bdev));
680 case BLKBSZSET_32:
681 return blkdev_bszset(bdev, mode, argp);
682 case BLKGETSIZE64_32:
683 return put_u64(argp, i_size_read(bdev->bd_inode));
684
685 /* Incompatible alignment on i386 */
686 case BLKTRACESETUP32:
687 return blk_trace_ioctl(bdev, cmd, argp);
688 default:
689 break;
690 }
691
692 ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
693 if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
694 ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
695
696 return ret;
697 }
698 #endif
699
