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Merge branch 'stable/e820-3.2' of git://git.kernel.org/pub/scm/linux/kernel/git/konra...
[linux-btrfs-devel.git] / block / compat_ioctl.c
blob7b725020823c82243418c7d0105b9f6d23260589
1 #include <linux/blkdev.h>
2 #include <linux/blkpg.h>
3 #include <linux/blktrace_api.h>
4 #include <linux/cdrom.h>
5 #include <linux/compat.h>
6 #include <linux/elevator.h>
7 #include <linux/fd.h>
8 #include <linux/hdreg.h>
9 #include <linux/slab.h>
10 #include <linux/syscalls.h>
11 #include <linux/types.h>
12 #include <linux/uaccess.h>
13
14 static int compat_put_ushort(unsigned long arg, unsigned short val)
15 {
16 return put_user(val, (unsigned short __user *)compat_ptr(arg));
17 }
18
19 static int compat_put_int(unsigned long arg, int val)
20 {
21 return put_user(val, (compat_int_t __user *)compat_ptr(arg));
22 }
23
24 static int compat_put_uint(unsigned long arg, unsigned int val)
25 {
26 return put_user(val, (compat_uint_t __user *)compat_ptr(arg));
27 }
28
29 static int compat_put_long(unsigned long arg, long val)
30 {
31 return put_user(val, (compat_long_t __user *)compat_ptr(arg));
32 }
33
34 static int compat_put_ulong(unsigned long arg, compat_ulong_t val)
35 {
36 return put_user(val, (compat_ulong_t __user *)compat_ptr(arg));
37 }
38
39 static int compat_put_u64(unsigned long arg, u64 val)
40 {
41 return put_user(val, (compat_u64 __user *)compat_ptr(arg));
42 }
43
44 struct compat_hd_geometry {
45 unsigned char heads;
46 unsigned char sectors;
47 unsigned short cylinders;
48 u32 start;
49 };
50
51 static int compat_hdio_getgeo(struct gendisk *disk, struct block_device *bdev,
52 struct compat_hd_geometry __user *ugeo)
53 {
54 struct hd_geometry geo;
55 int ret;
56
57 if (!ugeo)
58 return -EINVAL;
59 if (!disk->fops->getgeo)
60 return -ENOTTY;
61
62 /*
63 * We need to set the startsect first, the driver may
64 * want to override it.
65 */
66 geo.start = get_start_sect(bdev);
67 ret = disk->fops->getgeo(bdev, &geo);
68 if (ret)
69 return ret;
70
71 ret = copy_to_user(ugeo, &geo, 4);
72 ret |= __put_user(geo.start, &ugeo->start);
73 if (ret)
74 ret = -EFAULT;
75
76 return ret;
77 }
78
79 static int compat_hdio_ioctl(struct block_device *bdev, fmode_t mode,
80 unsigned int cmd, unsigned long arg)
81 {
82 mm_segment_t old_fs = get_fs();
83 unsigned long kval;
84 unsigned int __user *uvp;
85 int error;
86
87 set_fs(KERNEL_DS);
88 error = __blkdev_driver_ioctl(bdev, mode,
89 cmd, (unsigned long)(&kval));
90 set_fs(old_fs);
91
92 if (error == 0) {
93 uvp = compat_ptr(arg);
94 if (put_user(kval, uvp))
95 error = -EFAULT;
96 }
97 return error;
98 }
99
100 struct compat_cdrom_read_audio {
101 union cdrom_addr addr;
102 u8 addr_format;
103 compat_int_t nframes;
104 compat_caddr_t buf;
105 };
106
107 struct compat_cdrom_generic_command {
108 unsigned char cmd[CDROM_PACKET_SIZE];
109 compat_caddr_t buffer;
110 compat_uint_t buflen;
111 compat_int_t stat;
112 compat_caddr_t sense;
113 unsigned char data_direction;
114 compat_int_t quiet;
115 compat_int_t timeout;
116 compat_caddr_t reserved[1];
117 };
118
119 static int compat_cdrom_read_audio(struct block_device *bdev, fmode_t mode,
120 unsigned int cmd, unsigned long arg)
121 {
122 struct cdrom_read_audio __user *cdread_audio;
123 struct compat_cdrom_read_audio __user *cdread_audio32;
124 __u32 data;
125 void __user *datap;
126
127 cdread_audio = compat_alloc_user_space(sizeof(*cdread_audio));
128 cdread_audio32 = compat_ptr(arg);
129
130 if (copy_in_user(&cdread_audio->addr,
131 &cdread_audio32->addr,
132 (sizeof(*cdread_audio32) -
133 sizeof(compat_caddr_t))))
134 return -EFAULT;
135
136 if (get_user(data, &cdread_audio32->buf))
137 return -EFAULT;
138 datap = compat_ptr(data);
139 if (put_user(datap, &cdread_audio->buf))
140 return -EFAULT;
141
142 return __blkdev_driver_ioctl(bdev, mode, cmd,
143 (unsigned long)cdread_audio);
144 }
145
146 static int compat_cdrom_generic_command(struct block_device *bdev, fmode_t mode,
147 unsigned int cmd, unsigned long arg)
148 {
149 struct cdrom_generic_command __user *cgc;
150 struct compat_cdrom_generic_command __user *cgc32;
151 u32 data;
152 unsigned char dir;
153 int itmp;
154
155 cgc = compat_alloc_user_space(sizeof(*cgc));
156 cgc32 = compat_ptr(arg);
157
158 if (copy_in_user(&cgc->cmd, &cgc32->cmd, sizeof(cgc->cmd)) ||
159 get_user(data, &cgc32->buffer) ||
160 put_user(compat_ptr(data), &cgc->buffer) ||
161 copy_in_user(&cgc->buflen, &cgc32->buflen,
162 (sizeof(unsigned int) + sizeof(int))) ||
163 get_user(data, &cgc32->sense) ||
164 put_user(compat_ptr(data), &cgc->sense) ||
165 get_user(dir, &cgc32->data_direction) ||
166 put_user(dir, &cgc->data_direction) ||
167 get_user(itmp, &cgc32->quiet) ||
168 put_user(itmp, &cgc->quiet) ||
169 get_user(itmp, &cgc32->timeout) ||
170 put_user(itmp, &cgc->timeout) ||
171 get_user(data, &cgc32->reserved[0]) ||
172 put_user(compat_ptr(data), &cgc->reserved[0]))
173 return -EFAULT;
174
175 return __blkdev_driver_ioctl(bdev, mode, cmd, (unsigned long)cgc);
176 }
177
178 struct compat_blkpg_ioctl_arg {
179 compat_int_t op;
180 compat_int_t flags;
181 compat_int_t datalen;
182 compat_caddr_t data;
183 };
184
185 static int compat_blkpg_ioctl(struct block_device *bdev, fmode_t mode,
186 unsigned int cmd, struct compat_blkpg_ioctl_arg __user *ua32)
187 {
188 struct blkpg_ioctl_arg __user *a = compat_alloc_user_space(sizeof(*a));
189 compat_caddr_t udata;
190 compat_int_t n;
191 int err;
192
193 err = get_user(n, &ua32->op);
194 err |= put_user(n, &a->op);
195 err |= get_user(n, &ua32->flags);
196 err |= put_user(n, &a->flags);
197 err |= get_user(n, &ua32->datalen);
198 err |= put_user(n, &a->datalen);
199 err |= get_user(udata, &ua32->data);
200 err |= put_user(compat_ptr(udata), &a->data);
201 if (err)
202 return err;
203
204 return blkdev_ioctl(bdev, mode, cmd, (unsigned long)a);
205 }
206
207 #define BLKBSZGET_32 _IOR(0x12, 112, int)
208 #define BLKBSZSET_32 _IOW(0x12, 113, int)
209 #define BLKGETSIZE64_32 _IOR(0x12, 114, int)
210
211 struct compat_floppy_drive_params {
212 char cmos;
213 compat_ulong_t max_dtr;
214 compat_ulong_t hlt;
215 compat_ulong_t hut;
216 compat_ulong_t srt;
217 compat_ulong_t spinup;
218 compat_ulong_t spindown;
219 unsigned char spindown_offset;
220 unsigned char select_delay;
221 unsigned char rps;
222 unsigned char tracks;
223 compat_ulong_t timeout;
224 unsigned char interleave_sect;
225 struct floppy_max_errors max_errors;
226 char flags;
227 char read_track;
228 short autodetect[8];
229 compat_int_t checkfreq;
230 compat_int_t native_format;
231 };
232
233 struct compat_floppy_drive_struct {
234 signed char flags;
235 compat_ulong_t spinup_date;
236 compat_ulong_t select_date;
237 compat_ulong_t first_read_date;
238 short probed_format;
239 short track;
240 short maxblock;
241 short maxtrack;
242 compat_int_t generation;
243 compat_int_t keep_data;
244 compat_int_t fd_ref;
245 compat_int_t fd_device;
246 compat_int_t last_checked;
247 compat_caddr_t dmabuf;
248 compat_int_t bufblocks;
249 };
250
251 struct compat_floppy_fdc_state {
252 compat_int_t spec1;
253 compat_int_t spec2;
254 compat_int_t dtr;
255 unsigned char version;
256 unsigned char dor;
257 compat_ulong_t address;
258 unsigned int rawcmd:2;
259 unsigned int reset:1;
260 unsigned int need_configure:1;
261 unsigned int perp_mode:2;
262 unsigned int has_fifo:1;
263 unsigned int driver_version;
264 unsigned char track[4];
265 };
266
267 struct compat_floppy_write_errors {
268 unsigned int write_errors;
269 compat_ulong_t first_error_sector;
270 compat_int_t first_error_generation;
271 compat_ulong_t last_error_sector;
272 compat_int_t last_error_generation;
273 compat_uint_t badness;
274 };
275
276 #define FDSETPRM32 _IOW(2, 0x42, struct compat_floppy_struct)
277 #define FDDEFPRM32 _IOW(2, 0x43, struct compat_floppy_struct)
278 #define FDSETDRVPRM32 _IOW(2, 0x90, struct compat_floppy_drive_params)
279 #define FDGETDRVPRM32 _IOR(2, 0x11, struct compat_floppy_drive_params)
280 #define FDGETDRVSTAT32 _IOR(2, 0x12, struct compat_floppy_drive_struct)
281 #define FDPOLLDRVSTAT32 _IOR(2, 0x13, struct compat_floppy_drive_struct)
282 #define FDGETFDCSTAT32 _IOR(2, 0x15, struct compat_floppy_fdc_state)
283 #define FDWERRORGET32 _IOR(2, 0x17, struct compat_floppy_write_errors)
284
285 static struct {
286 unsigned int cmd32;
287 unsigned int cmd;
288 } fd_ioctl_trans_table[] = {
289 { FDSETPRM32, FDSETPRM },
290 { FDDEFPRM32, FDDEFPRM },
291 { FDGETPRM32, FDGETPRM },
292 { FDSETDRVPRM32, FDSETDRVPRM },
293 { FDGETDRVPRM32, FDGETDRVPRM },
294 { FDGETDRVSTAT32, FDGETDRVSTAT },
295 { FDPOLLDRVSTAT32, FDPOLLDRVSTAT },
296 { FDGETFDCSTAT32, FDGETFDCSTAT },
297 { FDWERRORGET32, FDWERRORGET }
298 };
299
300 #define NR_FD_IOCTL_TRANS ARRAY_SIZE(fd_ioctl_trans_table)
301
302 static int compat_fd_ioctl(struct block_device *bdev, fmode_t mode,
303 unsigned int cmd, unsigned long arg)
304 {
305 mm_segment_t old_fs = get_fs();
306 void *karg = NULL;
307 unsigned int kcmd = 0;
308 int i, err;
309
310 for (i = 0; i < NR_FD_IOCTL_TRANS; i++)
311 if (cmd == fd_ioctl_trans_table[i].cmd32) {
312 kcmd = fd_ioctl_trans_table[i].cmd;
313 break;
314 }
315 if (!kcmd)
316 return -EINVAL;
317
318 switch (cmd) {
319 case FDSETPRM32:
320 case FDDEFPRM32:
321 case FDGETPRM32:
322 {
323 compat_uptr_t name;
324 struct compat_floppy_struct __user *uf;
325 struct floppy_struct *f;
326
327 uf = compat_ptr(arg);
328 f = karg = kmalloc(sizeof(struct floppy_struct), GFP_KERNEL);
329 if (!karg)
330 return -ENOMEM;
331 if (cmd == FDGETPRM32)
332 break;
333 err = __get_user(f->size, &uf->size);
334 err |= __get_user(f->sect, &uf->sect);
335 err |= __get_user(f->head, &uf->head);
336 err |= __get_user(f->track, &uf->track);
337 err |= __get_user(f->stretch, &uf->stretch);
338 err |= __get_user(f->gap, &uf->gap);
339 err |= __get_user(f->rate, &uf->rate);
340 err |= __get_user(f->spec1, &uf->spec1);
341 err |= __get_user(f->fmt_gap, &uf->fmt_gap);
342 err |= __get_user(name, &uf->name);
343 f->name = compat_ptr(name);
344 if (err) {
345 err = -EFAULT;
346 goto out;
347 }
348 break;
349 }
350 case FDSETDRVPRM32:
351 case FDGETDRVPRM32:
352 {
353 struct compat_floppy_drive_params __user *uf;
354 struct floppy_drive_params *f;
355
356 uf = compat_ptr(arg);
357 f = karg = kmalloc(sizeof(struct floppy_drive_params), GFP_KERNEL);
358 if (!karg)
359 return -ENOMEM;
360 if (cmd == FDGETDRVPRM32)
361 break;
362 err = __get_user(f->cmos, &uf->cmos);
363 err |= __get_user(f->max_dtr, &uf->max_dtr);
364 err |= __get_user(f->hlt, &uf->hlt);
365 err |= __get_user(f->hut, &uf->hut);
366 err |= __get_user(f->srt, &uf->srt);
367 err |= __get_user(f->spinup, &uf->spinup);
368 err |= __get_user(f->spindown, &uf->spindown);
369 err |= __get_user(f->spindown_offset, &uf->spindown_offset);
370 err |= __get_user(f->select_delay, &uf->select_delay);
371 err |= __get_user(f->rps, &uf->rps);
372 err |= __get_user(f->tracks, &uf->tracks);
373 err |= __get_user(f->timeout, &uf->timeout);
374 err |= __get_user(f->interleave_sect, &uf->interleave_sect);
375 err |= __copy_from_user(&f->max_errors, &uf->max_errors, sizeof(f->max_errors));
376 err |= __get_user(f->flags, &uf->flags);
377 err |= __get_user(f->read_track, &uf->read_track);
378 err |= __copy_from_user(f->autodetect, uf->autodetect, sizeof(f->autodetect));
379 err |= __get_user(f->checkfreq, &uf->checkfreq);
380 err |= __get_user(f->native_format, &uf->native_format);
381 if (err) {
382 err = -EFAULT;
383 goto out;
384 }
385 break;
386 }
387 case FDGETDRVSTAT32:
388 case FDPOLLDRVSTAT32:
389 karg = kmalloc(sizeof(struct floppy_drive_struct), GFP_KERNEL);
390 if (!karg)
391 return -ENOMEM;
392 break;
393 case FDGETFDCSTAT32:
394 karg = kmalloc(sizeof(struct floppy_fdc_state), GFP_KERNEL);
395 if (!karg)
396 return -ENOMEM;
397 break;
398 case FDWERRORGET32:
399 karg = kmalloc(sizeof(struct floppy_write_errors), GFP_KERNEL);
400 if (!karg)
401 return -ENOMEM;
402 break;
403 default:
404 return -EINVAL;
405 }
406 set_fs(KERNEL_DS);
407 err = __blkdev_driver_ioctl(bdev, mode, kcmd, (unsigned long)karg);
408 set_fs(old_fs);
409 if (err)
410 goto out;
411 switch (cmd) {
412 case FDGETPRM32:
413 {
414 struct floppy_struct *f = karg;
415 struct compat_floppy_struct __user *uf = compat_ptr(arg);
416
417 err = __put_user(f->size, &uf->size);
418 err |= __put_user(f->sect, &uf->sect);
419 err |= __put_user(f->head, &uf->head);
420 err |= __put_user(f->track, &uf->track);
421 err |= __put_user(f->stretch, &uf->stretch);
422 err |= __put_user(f->gap, &uf->gap);
423 err |= __put_user(f->rate, &uf->rate);
424 err |= __put_user(f->spec1, &uf->spec1);
425 err |= __put_user(f->fmt_gap, &uf->fmt_gap);
426 err |= __put_user((u64)f->name, (compat_caddr_t __user *)&uf->name);
427 break;
428 }
429 case FDGETDRVPRM32:
430 {
431 struct compat_floppy_drive_params __user *uf;
432 struct floppy_drive_params *f = karg;
433
434 uf = compat_ptr(arg);
435 err = __put_user(f->cmos, &uf->cmos);
436 err |= __put_user(f->max_dtr, &uf->max_dtr);
437 err |= __put_user(f->hlt, &uf->hlt);
438 err |= __put_user(f->hut, &uf->hut);
439 err |= __put_user(f->srt, &uf->srt);
440 err |= __put_user(f->spinup, &uf->spinup);
441 err |= __put_user(f->spindown, &uf->spindown);
442 err |= __put_user(f->spindown_offset, &uf->spindown_offset);
443 err |= __put_user(f->select_delay, &uf->select_delay);
444 err |= __put_user(f->rps, &uf->rps);
445 err |= __put_user(f->tracks, &uf->tracks);
446 err |= __put_user(f->timeout, &uf->timeout);
447 err |= __put_user(f->interleave_sect, &uf->interleave_sect);
448 err |= __copy_to_user(&uf->max_errors, &f->max_errors, sizeof(f->max_errors));
449 err |= __put_user(f->flags, &uf->flags);
450 err |= __put_user(f->read_track, &uf->read_track);
451 err |= __copy_to_user(uf->autodetect, f->autodetect, sizeof(f->autodetect));
452 err |= __put_user(f->checkfreq, &uf->checkfreq);
453 err |= __put_user(f->native_format, &uf->native_format);
454 break;
455 }
456 case FDGETDRVSTAT32:
457 case FDPOLLDRVSTAT32:
458 {
459 struct compat_floppy_drive_struct __user *uf;
460 struct floppy_drive_struct *f = karg;
461
462 uf = compat_ptr(arg);
463 err = __put_user(f->flags, &uf->flags);
464 err |= __put_user(f->spinup_date, &uf->spinup_date);
465 err |= __put_user(f->select_date, &uf->select_date);
466 err |= __put_user(f->first_read_date, &uf->first_read_date);
467 err |= __put_user(f->probed_format, &uf->probed_format);
468 err |= __put_user(f->track, &uf->track);
469 err |= __put_user(f->maxblock, &uf->maxblock);
470 err |= __put_user(f->maxtrack, &uf->maxtrack);
471 err |= __put_user(f->generation, &uf->generation);
472 err |= __put_user(f->keep_data, &uf->keep_data);
473 err |= __put_user(f->fd_ref, &uf->fd_ref);
474 err |= __put_user(f->fd_device, &uf->fd_device);
475 err |= __put_user(f->last_checked, &uf->last_checked);
476 err |= __put_user((u64)f->dmabuf, &uf->dmabuf);
477 err |= __put_user((u64)f->bufblocks, &uf->bufblocks);
478 break;
479 }
480 case FDGETFDCSTAT32:
481 {
482 struct compat_floppy_fdc_state __user *uf;
483 struct floppy_fdc_state *f = karg;
484
485 uf = compat_ptr(arg);
486 err = __put_user(f->spec1, &uf->spec1);
487 err |= __put_user(f->spec2, &uf->spec2);
488 err |= __put_user(f->dtr, &uf->dtr);
489 err |= __put_user(f->version, &uf->version);
490 err |= __put_user(f->dor, &uf->dor);
491 err |= __put_user(f->address, &uf->address);
492 err |= __copy_to_user((char __user *)&uf->address + sizeof(uf->address),
493 (char *)&f->address + sizeof(f->address), sizeof(int));
494 err |= __put_user(f->driver_version, &uf->driver_version);
495 err |= __copy_to_user(uf->track, f->track, sizeof(f->track));
496 break;
497 }
498 case FDWERRORGET32:
499 {
500 struct compat_floppy_write_errors __user *uf;
501 struct floppy_write_errors *f = karg;
502
503 uf = compat_ptr(arg);
504 err = __put_user(f->write_errors, &uf->write_errors);
505 err |= __put_user(f->first_error_sector, &uf->first_error_sector);
506 err |= __put_user(f->first_error_generation, &uf->first_error_generation);
507 err |= __put_user(f->last_error_sector, &uf->last_error_sector);
508 err |= __put_user(f->last_error_generation, &uf->last_error_generation);
509 err |= __put_user(f->badness, &uf->badness);
510 break;
511 }
512 default:
513 break;
514 }
515 if (err)
516 err = -EFAULT;
517
518 out:
519 kfree(karg);
520 return err;
521 }
522
523 static int compat_blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
524 unsigned cmd, unsigned long arg)
525 {
526 switch (cmd) {
527 case HDIO_GET_UNMASKINTR:
528 case HDIO_GET_MULTCOUNT:
529 case HDIO_GET_KEEPSETTINGS:
530 case HDIO_GET_32BIT:
531 case HDIO_GET_NOWERR:
532 case HDIO_GET_DMA:
533 case HDIO_GET_NICE:
534 case HDIO_GET_WCACHE:
535 case HDIO_GET_ACOUSTIC:
536 case HDIO_GET_ADDRESS:
537 case HDIO_GET_BUSSTATE:
538 return compat_hdio_ioctl(bdev, mode, cmd, arg);
539 case FDSETPRM32:
540 case FDDEFPRM32:
541 case FDGETPRM32:
542 case FDSETDRVPRM32:
543 case FDGETDRVPRM32:
544 case FDGETDRVSTAT32:
545 case FDPOLLDRVSTAT32:
546 case FDGETFDCSTAT32:
547 case FDWERRORGET32:
548 return compat_fd_ioctl(bdev, mode, cmd, arg);
549 case CDROMREADAUDIO:
550 return compat_cdrom_read_audio(bdev, mode, cmd, arg);
551 case CDROM_SEND_PACKET:
552 return compat_cdrom_generic_command(bdev, mode, cmd, arg);
553
554 /*
555 * No handler required for the ones below, we just need to
556 * convert arg to a 64 bit pointer.
557 */
558 case BLKSECTSET:
559 /*
560 * 0x03 -- HD/IDE ioctl's used by hdparm and friends.
561 * Some need translations, these do not.
562 */
563 case HDIO_GET_IDENTITY:
564 case HDIO_DRIVE_TASK:
565 case HDIO_DRIVE_CMD:
566 /* 0x330 is reserved -- it used to be HDIO_GETGEO_BIG */
567 case 0x330:
568 /* 0x02 -- Floppy ioctls */
569 case FDMSGON:
570 case FDMSGOFF:
571 case FDSETEMSGTRESH:
572 case FDFLUSH:
573 case FDWERRORCLR:
574 case FDSETMAXERRS:
575 case FDGETMAXERRS:
576 case FDGETDRVTYP:
577 case FDEJECT:
578 case FDCLRPRM:
579 case FDFMTBEG:
580 case FDFMTEND:
581 case FDRESET:
582 case FDTWADDLE:
583 case FDFMTTRK:
584 case FDRAWCMD:
585 /* CDROM stuff */
586 case CDROMPAUSE:
587 case CDROMRESUME:
588 case CDROMPLAYMSF:
589 case CDROMPLAYTRKIND:
590 case CDROMREADTOCHDR:
591 case CDROMREADTOCENTRY:
592 case CDROMSTOP:
593 case CDROMSTART:
594 case CDROMEJECT:
595 case CDROMVOLCTRL:
596 case CDROMSUBCHNL:
597 case CDROMMULTISESSION:
598 case CDROM_GET_MCN:
599 case CDROMRESET:
600 case CDROMVOLREAD:
601 case CDROMSEEK:
602 case CDROMPLAYBLK:
603 case CDROMCLOSETRAY:
604 case CDROM_DISC_STATUS:
605 case CDROM_CHANGER_NSLOTS:
606 case CDROM_GET_CAPABILITY:
607 /* Ignore cdrom.h about these next 5 ioctls, they absolutely do
608 * not take a struct cdrom_read, instead they take a struct cdrom_msf
609 * which is compatible.
610 */
611 case CDROMREADMODE2:
612 case CDROMREADMODE1:
613 case CDROMREADRAW:
614 case CDROMREADCOOKED:
615 case CDROMREADALL:
616 /* DVD ioctls */
617 case DVD_READ_STRUCT:
618 case DVD_WRITE_STRUCT:
619 case DVD_AUTH:
620 arg = (unsigned long)compat_ptr(arg);
621 /* These intepret arg as an unsigned long, not as a pointer,
622 * so we must not do compat_ptr() conversion. */
623 case HDIO_SET_MULTCOUNT:
624 case HDIO_SET_UNMASKINTR:
625 case HDIO_SET_KEEPSETTINGS:
626 case HDIO_SET_32BIT:
627 case HDIO_SET_NOWERR:
628 case HDIO_SET_DMA:
629 case HDIO_SET_PIO_MODE:
630 case HDIO_SET_NICE:
631 case HDIO_SET_WCACHE:
632 case HDIO_SET_ACOUSTIC:
633 case HDIO_SET_BUSSTATE:
634 case HDIO_SET_ADDRESS:
635 case CDROMEJECT_SW:
636 case CDROM_SET_OPTIONS:
637 case CDROM_CLEAR_OPTIONS:
638 case CDROM_SELECT_SPEED:
639 case CDROM_SELECT_DISC:
640 case CDROM_MEDIA_CHANGED:
641 case CDROM_DRIVE_STATUS:
642 case CDROM_LOCKDOOR:
643 case CDROM_DEBUG:
644 break;
645 default:
646 /* unknown ioctl number */
647 return -ENOIOCTLCMD;
648 }
649
650 return __blkdev_driver_ioctl(bdev, mode, cmd, arg);
651 }
652
653 /* Most of the generic ioctls are handled in the normal fallback path.
654 This assumes the blkdev's low level compat_ioctl always returns
655 ENOIOCTLCMD for unknown ioctls. */
656 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
657 {
658 int ret = -ENOIOCTLCMD;
659 struct inode *inode = file->f_mapping->host;
660 struct block_device *bdev = inode->i_bdev;
661 struct gendisk *disk = bdev->bd_disk;
662 fmode_t mode = file->f_mode;
663 struct backing_dev_info *bdi;
664 loff_t size;
665
666 /*
667 * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
668 * to updated it before every ioctl.
669 */
670 if (file->f_flags & O_NDELAY)
671 mode |= FMODE_NDELAY;
672 else
673 mode &= ~FMODE_NDELAY;
674
675 switch (cmd) {
676 case HDIO_GETGEO:
677 return compat_hdio_getgeo(disk, bdev, compat_ptr(arg));
678 case BLKPBSZGET:
679 return compat_put_uint(arg, bdev_physical_block_size(bdev));
680 case BLKIOMIN:
681 return compat_put_uint(arg, bdev_io_min(bdev));
682 case BLKIOOPT:
683 return compat_put_uint(arg, bdev_io_opt(bdev));
684 case BLKALIGNOFF:
685 return compat_put_int(arg, bdev_alignment_offset(bdev));
686 case BLKDISCARDZEROES:
687 return compat_put_uint(arg, bdev_discard_zeroes_data(bdev));
688 case BLKFLSBUF:
689 case BLKROSET:
690 case BLKDISCARD:
691 case BLKSECDISCARD:
692 /*
693 * the ones below are implemented in blkdev_locked_ioctl,
694 * but we call blkdev_ioctl, which gets the lock for us
695 */
696 case BLKRRPART:
697 return blkdev_ioctl(bdev, mode, cmd,
698 (unsigned long)compat_ptr(arg));
699 case BLKBSZSET_32:
700 return blkdev_ioctl(bdev, mode, BLKBSZSET,
701 (unsigned long)compat_ptr(arg));
702 case BLKPG:
703 return compat_blkpg_ioctl(bdev, mode, cmd, compat_ptr(arg));
704 case BLKRAGET:
705 case BLKFRAGET:
706 if (!arg)
707 return -EINVAL;
708 bdi = blk_get_backing_dev_info(bdev);
709 if (bdi == NULL)
710 return -ENOTTY;
711 return compat_put_long(arg,
712 (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
713 case BLKROGET: /* compatible */
714 return compat_put_int(arg, bdev_read_only(bdev) != 0);
715 case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
716 return compat_put_int(arg, block_size(bdev));
717 case BLKSSZGET: /* get block device hardware sector size */
718 return compat_put_int(arg, bdev_logical_block_size(bdev));
719 case BLKSECTGET:
720 return compat_put_ushort(arg,
721 queue_max_sectors(bdev_get_queue(bdev)));
722 case BLKRASET: /* compatible, but no compat_ptr (!) */
723 case BLKFRASET:
724 if (!capable(CAP_SYS_ADMIN))
725 return -EACCES;
726 bdi = blk_get_backing_dev_info(bdev);
727 if (bdi == NULL)
728 return -ENOTTY;
729 bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
730 return 0;
731 case BLKGETSIZE:
732 size = i_size_read(bdev->bd_inode);
733 if ((size >> 9) > ~0UL)
734 return -EFBIG;
735 return compat_put_ulong(arg, size >> 9);
736
737 case BLKGETSIZE64_32:
738 return compat_put_u64(arg, i_size_read(bdev->bd_inode));
739
740 case BLKTRACESETUP32:
741 case BLKTRACESTART: /* compatible */
742 case BLKTRACESTOP: /* compatible */
743 case BLKTRACETEARDOWN: /* compatible */
744 ret = blk_trace_ioctl(bdev, cmd, compat_ptr(arg));
745 return ret;
746 default:
747 if (disk->fops->compat_ioctl)
748 ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
749 if (ret == -ENOIOCTLCMD)
750 ret = compat_blkdev_driver_ioctl(bdev, mode, cmd, arg);
751 return ret;
752 }
753 }
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