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compat_ioctl.c
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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 BLKROTATIONAL:
723  return compat_put_ushort(arg,
724  !blk_queue_nonrot(bdev_get_queue(bdev)));
725  case BLKRASET: /* compatible, but no compat_ptr (!) */
726  case BLKFRASET:
727  if (!capable(CAP_SYS_ADMIN))
728  return -EACCES;
729  bdi = blk_get_backing_dev_info(bdev);
730  if (bdi == NULL)
731  return -ENOTTY;
732  bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
733  return 0;
734  case BLKGETSIZE:
735  size = i_size_read(bdev->bd_inode);
736  if ((size >> 9) > ~0UL)
737  return -EFBIG;
738  return compat_put_ulong(arg, size >> 9);
739 
740  case BLKGETSIZE64_32:
741  return compat_put_u64(arg, i_size_read(bdev->bd_inode));
742 
743  case BLKTRACESETUP32:
744  case BLKTRACESTART: /* compatible */
745  case BLKTRACESTOP: /* compatible */
746  case BLKTRACETEARDOWN: /* compatible */
747  ret = blk_trace_ioctl(bdev, cmd, compat_ptr(arg));
748  return ret;
749  default:
750  if (disk->fops->compat_ioctl)
751  ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
752  if (ret == -ENOIOCTLCMD)
753  ret = compat_blkdev_driver_ioctl(bdev, mode, cmd, arg);
754  return ret;
755  }
756 }
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