Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

Linux/block/compat_ioctl.c

  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         memset(&geo, 0, sizeof(geo));
 63         /*
 64          * We need to set the startsect first, the driver may
 65          * want to override it.
 66          */
 67         geo.start = get_start_sect(bdev);
 68         ret = disk->fops->getgeo(bdev, &geo);
 69         if (ret)
 70                 return ret;
 71 
 72         ret = copy_to_user(ugeo, &geo, 4);
 73         ret |= put_user(geo.start, &ugeo->start);
 74         if (ret)
 75                 ret = -EFAULT;
 76 
 77         return ret;
 78 }
 79 
 80 static int compat_hdio_ioctl(struct block_device *bdev, fmode_t mode,
 81                 unsigned int cmd, unsigned long arg)
 82 {
 83         mm_segment_t old_fs = get_fs();
 84         unsigned long kval;
 85         unsigned int __user *uvp;
 86         int error;
 87 
 88         set_fs(KERNEL_DS);
 89         error = __blkdev_driver_ioctl(bdev, mode,
 90                                 cmd, (unsigned long)(&kval));
 91         set_fs(old_fs);
 92 
 93         if (error == 0) {
 94                 uvp = compat_ptr(arg);
 95                 if (put_user(kval, uvp))
 96                         error = -EFAULT;
 97         }
 98         return error;
 99 }
100 
101 struct compat_cdrom_read_audio {
102         union cdrom_addr        addr;
103         u8                      addr_format;
104         compat_int_t            nframes;
105         compat_caddr_t          buf;
106 };
107 
108 struct compat_cdrom_generic_command {
109         unsigned char   cmd[CDROM_PACKET_SIZE];
110         compat_caddr_t  buffer;
111         compat_uint_t   buflen;
112         compat_int_t    stat;
113         compat_caddr_t  sense;
114         unsigned char   data_direction;
115         compat_int_t    quiet;
116         compat_int_t    timeout;
117         compat_caddr_t  reserved[1];
118 };
119 
120 static int compat_cdrom_read_audio(struct block_device *bdev, fmode_t mode,
121                 unsigned int cmd, unsigned long arg)
122 {
123         struct cdrom_read_audio __user *cdread_audio;
124         struct compat_cdrom_read_audio __user *cdread_audio32;
125         __u32 data;
126         void __user *datap;
127 
128         cdread_audio = compat_alloc_user_space(sizeof(*cdread_audio));
129         cdread_audio32 = compat_ptr(arg);
130 
131         if (copy_in_user(&cdread_audio->addr,
132                          &cdread_audio32->addr,
133                          (sizeof(*cdread_audio32) -
134                           sizeof(compat_caddr_t))))
135                 return -EFAULT;
136 
137         if (get_user(data, &cdread_audio32->buf))
138                 return -EFAULT;
139         datap = compat_ptr(data);
140         if (put_user(datap, &cdread_audio->buf))
141                 return -EFAULT;
142 
143         return __blkdev_driver_ioctl(bdev, mode, cmd,
144                         (unsigned long)cdread_audio);
145 }
146 
147 static int compat_cdrom_generic_command(struct block_device *bdev, fmode_t mode,
148                 unsigned int cmd, unsigned long arg)
149 {
150         struct cdrom_generic_command __user *cgc;
151         struct compat_cdrom_generic_command __user *cgc32;
152         u32 data;
153         unsigned char dir;
154         int itmp;
155 
156         cgc = compat_alloc_user_space(sizeof(*cgc));
157         cgc32 = compat_ptr(arg);
158 
159         if (copy_in_user(&cgc->cmd, &cgc32->cmd, sizeof(cgc->cmd)) ||
160             get_user(data, &cgc32->buffer) ||
161             put_user(compat_ptr(data), &cgc->buffer) ||
162             copy_in_user(&cgc->buflen, &cgc32->buflen,
163                          (sizeof(unsigned int) + sizeof(int))) ||
164             get_user(data, &cgc32->sense) ||
165             put_user(compat_ptr(data), &cgc->sense) ||
166             get_user(dir, &cgc32->data_direction) ||
167             put_user(dir, &cgc->data_direction) ||
168             get_user(itmp, &cgc32->quiet) ||
169             put_user(itmp, &cgc->quiet) ||
170             get_user(itmp, &cgc32->timeout) ||
171             put_user(itmp, &cgc->timeout) ||
172             get_user(data, &cgc32->reserved[0]) ||
173             put_user(compat_ptr(data), &cgc->reserved[0]))
174                 return -EFAULT;
175 
176         return __blkdev_driver_ioctl(bdev, mode, cmd, (unsigned long)cgc);
177 }
178 
179 struct compat_blkpg_ioctl_arg {
180         compat_int_t op;
181         compat_int_t flags;
182         compat_int_t datalen;
183         compat_caddr_t data;
184 };
185 
186 static int compat_blkpg_ioctl(struct block_device *bdev, fmode_t mode,
187                 unsigned int cmd, struct compat_blkpg_ioctl_arg __user *ua32)
188 {
189         struct blkpg_ioctl_arg __user *a = compat_alloc_user_space(sizeof(*a));
190         compat_caddr_t udata;
191         compat_int_t n;
192         int err;
193 
194         err = get_user(n, &ua32->op);
195         err |= put_user(n, &a->op);
196         err |= get_user(n, &ua32->flags);
197         err |= put_user(n, &a->flags);
198         err |= get_user(n, &ua32->datalen);
199         err |= put_user(n, &a->datalen);
200         err |= get_user(udata, &ua32->data);
201         err |= put_user(compat_ptr(udata), &a->data);
202         if (err)
203                 return err;
204 
205         return blkdev_ioctl(bdev, mode, cmd, (unsigned long)a);
206 }
207 
208 #define BLKBSZGET_32            _IOR(0x12, 112, int)
209 #define BLKBSZSET_32            _IOW(0x12, 113, int)
210 #define BLKGETSIZE64_32         _IOR(0x12, 114, int)
211 
212 struct compat_floppy_drive_params {
213         char            cmos;
214         compat_ulong_t  max_dtr;
215         compat_ulong_t  hlt;
216         compat_ulong_t  hut;
217         compat_ulong_t  srt;
218         compat_ulong_t  spinup;
219         compat_ulong_t  spindown;
220         unsigned char   spindown_offset;
221         unsigned char   select_delay;
222         unsigned char   rps;
223         unsigned char   tracks;
224         compat_ulong_t  timeout;
225         unsigned char   interleave_sect;
226         struct floppy_max_errors max_errors;
227         char            flags;
228         char            read_track;
229         short           autodetect[8];
230         compat_int_t    checkfreq;
231         compat_int_t    native_format;
232 };
233 
234 struct compat_floppy_drive_struct {
235         signed char     flags;
236         compat_ulong_t  spinup_date;
237         compat_ulong_t  select_date;
238         compat_ulong_t  first_read_date;
239         short           probed_format;
240         short           track;
241         short           maxblock;
242         short           maxtrack;
243         compat_int_t    generation;
244         compat_int_t    keep_data;
245         compat_int_t    fd_ref;
246         compat_int_t    fd_device;
247         compat_int_t    last_checked;
248         compat_caddr_t dmabuf;
249         compat_int_t    bufblocks;
250 };
251 
252 struct compat_floppy_fdc_state {
253         compat_int_t    spec1;
254         compat_int_t    spec2;
255         compat_int_t    dtr;
256         unsigned char   version;
257         unsigned char   dor;
258         compat_ulong_t  address;
259         unsigned int    rawcmd:2;
260         unsigned int    reset:1;
261         unsigned int    need_configure:1;
262         unsigned int    perp_mode:2;
263         unsigned int    has_fifo:1;
264         unsigned int    driver_version;
265         unsigned char   track[4];
266 };
267 
268 struct compat_floppy_write_errors {
269         unsigned int    write_errors;
270         compat_ulong_t  first_error_sector;
271         compat_int_t    first_error_generation;
272         compat_ulong_t  last_error_sector;
273         compat_int_t    last_error_generation;
274         compat_uint_t   badness;
275 };
276 
277 #define FDSETPRM32 _IOW(2, 0x42, struct compat_floppy_struct)
278 #define FDDEFPRM32 _IOW(2, 0x43, struct compat_floppy_struct)
279 #define FDSETDRVPRM32 _IOW(2, 0x90, struct compat_floppy_drive_params)
280 #define FDGETDRVPRM32 _IOR(2, 0x11, struct compat_floppy_drive_params)
281 #define FDGETDRVSTAT32 _IOR(2, 0x12, struct compat_floppy_drive_struct)
282 #define FDPOLLDRVSTAT32 _IOR(2, 0x13, struct compat_floppy_drive_struct)
283 #define FDGETFDCSTAT32 _IOR(2, 0x15, struct compat_floppy_fdc_state)
284 #define FDWERRORGET32  _IOR(2, 0x17, struct compat_floppy_write_errors)
285 
286 static struct {
287         unsigned int    cmd32;
288         unsigned int    cmd;
289 } fd_ioctl_trans_table[] = {
290         { FDSETPRM32, FDSETPRM },
291         { FDDEFPRM32, FDDEFPRM },
292         { FDGETPRM32, FDGETPRM },
293         { FDSETDRVPRM32, FDSETDRVPRM },
294         { FDGETDRVPRM32, FDGETDRVPRM },
295         { FDGETDRVSTAT32, FDGETDRVSTAT },
296         { FDPOLLDRVSTAT32, FDPOLLDRVSTAT },
297         { FDGETFDCSTAT32, FDGETFDCSTAT },
298         { FDWERRORGET32, FDWERRORGET }
299 };
300 
301 #define NR_FD_IOCTL_TRANS ARRAY_SIZE(fd_ioctl_trans_table)
302 
303 static int compat_fd_ioctl(struct block_device *bdev, fmode_t mode,
304                 unsigned int cmd, unsigned long arg)
305 {
306         mm_segment_t old_fs = get_fs();
307         void *karg = NULL;
308         unsigned int kcmd = 0;
309         int i, err;
310 
311         for (i = 0; i < NR_FD_IOCTL_TRANS; i++)
312                 if (cmd == fd_ioctl_trans_table[i].cmd32) {
313                         kcmd = fd_ioctl_trans_table[i].cmd;
314                         break;
315                 }
316         if (!kcmd)
317                 return -EINVAL;
318 
319         switch (cmd) {
320         case FDSETPRM32:
321         case FDDEFPRM32:
322         case FDGETPRM32:
323         {
324                 compat_uptr_t name;
325                 struct compat_floppy_struct __user *uf;
326                 struct floppy_struct *f;
327 
328                 uf = compat_ptr(arg);
329                 f = karg = kmalloc(sizeof(struct floppy_struct), GFP_KERNEL);
330                 if (!karg)
331                         return -ENOMEM;
332                 if (cmd == FDGETPRM32)
333                         break;
334                 err = __get_user(f->size, &uf->size);
335                 err |= __get_user(f->sect, &uf->sect);
336                 err |= __get_user(f->head, &uf->head);
337                 err |= __get_user(f->track, &uf->track);
338                 err |= __get_user(f->stretch, &uf->stretch);
339                 err |= __get_user(f->gap, &uf->gap);
340                 err |= __get_user(f->rate, &uf->rate);
341                 err |= __get_user(f->spec1, &uf->spec1);
342                 err |= __get_user(f->fmt_gap, &uf->fmt_gap);
343                 err |= __get_user(name, &uf->name);
344                 f->name = compat_ptr(name);
345                 if (err) {
346                         err = -EFAULT;
347                         goto out;
348                 }
349                 break;
350         }
351         case FDSETDRVPRM32:
352         case FDGETDRVPRM32:
353         {
354                 struct compat_floppy_drive_params __user *uf;
355                 struct floppy_drive_params *f;
356 
357                 uf = compat_ptr(arg);
358                 f = karg = kmalloc(sizeof(struct floppy_drive_params), GFP_KERNEL);
359                 if (!karg)
360                         return -ENOMEM;
361                 if (cmd == FDGETDRVPRM32)
362                         break;
363                 err = __get_user(f->cmos, &uf->cmos);
364                 err |= __get_user(f->max_dtr, &uf->max_dtr);
365                 err |= __get_user(f->hlt, &uf->hlt);
366                 err |= __get_user(f->hut, &uf->hut);
367                 err |= __get_user(f->srt, &uf->srt);
368                 err |= __get_user(f->spinup, &uf->spinup);
369                 err |= __get_user(f->spindown, &uf->spindown);
370                 err |= __get_user(f->spindown_offset, &uf->spindown_offset);
371                 err |= __get_user(f->select_delay, &uf->select_delay);
372                 err |= __get_user(f->rps, &uf->rps);
373                 err |= __get_user(f->tracks, &uf->tracks);
374                 err |= __get_user(f->timeout, &uf->timeout);
375                 err |= __get_user(f->interleave_sect, &uf->interleave_sect);
376                 err |= __copy_from_user(&f->max_errors, &uf->max_errors, sizeof(f->max_errors));
377                 err |= __get_user(f->flags, &uf->flags);
378                 err |= __get_user(f->read_track, &uf->read_track);
379                 err |= __copy_from_user(f->autodetect, uf->autodetect, sizeof(f->autodetect));
380                 err |= __get_user(f->checkfreq, &uf->checkfreq);
381                 err |= __get_user(f->native_format, &uf->native_format);
382                 if (err) {
383                         err = -EFAULT;
384                         goto out;
385                 }
386                 break;
387         }
388         case FDGETDRVSTAT32:
389         case FDPOLLDRVSTAT32:
390                 karg = kmalloc(sizeof(struct floppy_drive_struct), GFP_KERNEL);
391                 if (!karg)
392                         return -ENOMEM;
393                 break;
394         case FDGETFDCSTAT32:
395                 karg = kmalloc(sizeof(struct floppy_fdc_state), GFP_KERNEL);
396                 if (!karg)
397                         return -ENOMEM;
398                 break;
399         case FDWERRORGET32:
400                 karg = kmalloc(sizeof(struct floppy_write_errors), GFP_KERNEL);
401                 if (!karg)
402                         return -ENOMEM;
403                 break;
404         default:
405                 return -EINVAL;
406         }
407         set_fs(KERNEL_DS);
408         err = __blkdev_driver_ioctl(bdev, mode, kcmd, (unsigned long)karg);
409         set_fs(old_fs);
410         if (err)
411                 goto out;
412         switch (cmd) {
413         case FDGETPRM32:
414         {
415                 struct floppy_struct *f = karg;
416                 struct compat_floppy_struct __user *uf = compat_ptr(arg);
417 
418                 err = __put_user(f->size, &uf->size);
419                 err |= __put_user(f->sect, &uf->sect);
420                 err |= __put_user(f->head, &uf->head);
421                 err |= __put_user(f->track, &uf->track);
422                 err |= __put_user(f->stretch, &uf->stretch);
423                 err |= __put_user(f->gap, &uf->gap);
424                 err |= __put_user(f->rate, &uf->rate);
425                 err |= __put_user(f->spec1, &uf->spec1);
426                 err |= __put_user(f->fmt_gap, &uf->fmt_gap);
427                 err |= __put_user((u64)f->name, (compat_caddr_t __user *)&uf->name);
428                 break;
429         }
430         case FDGETDRVPRM32:
431         {
432                 struct compat_floppy_drive_params __user *uf;
433                 struct floppy_drive_params *f = karg;
434 
435                 uf = compat_ptr(arg);
436                 err = __put_user(f->cmos, &uf->cmos);
437                 err |= __put_user(f->max_dtr, &uf->max_dtr);
438                 err |= __put_user(f->hlt, &uf->hlt);
439                 err |= __put_user(f->hut, &uf->hut);
440                 err |= __put_user(f->srt, &uf->srt);
441                 err |= __put_user(f->spinup, &uf->spinup);
442                 err |= __put_user(f->spindown, &uf->spindown);
443                 err |= __put_user(f->spindown_offset, &uf->spindown_offset);
444                 err |= __put_user(f->select_delay, &uf->select_delay);
445                 err |= __put_user(f->rps, &uf->rps);
446                 err |= __put_user(f->tracks, &uf->tracks);
447                 err |= __put_user(f->timeout, &uf->timeout);
448                 err |= __put_user(f->interleave_sect, &uf->interleave_sect);
449                 err |= __copy_to_user(&uf->max_errors, &f->max_errors, sizeof(f->max_errors));
450                 err |= __put_user(f->flags, &uf->flags);
451                 err |= __put_user(f->read_track, &uf->read_track);
452                 err |= __copy_to_user(uf->autodetect, f->autodetect, sizeof(f->autodetect));
453                 err |= __put_user(f->checkfreq, &uf->checkfreq);
454                 err |= __put_user(f->native_format, &uf->native_format);
455                 break;
456         }
457         case FDGETDRVSTAT32:
458         case FDPOLLDRVSTAT32:
459         {
460                 struct compat_floppy_drive_struct __user *uf;
461                 struct floppy_drive_struct *f = karg;
462 
463                 uf = compat_ptr(arg);
464                 err = __put_user(f->flags, &uf->flags);
465                 err |= __put_user(f->spinup_date, &uf->spinup_date);
466                 err |= __put_user(f->select_date, &uf->select_date);
467                 err |= __put_user(f->first_read_date, &uf->first_read_date);
468                 err |= __put_user(f->probed_format, &uf->probed_format);
469                 err |= __put_user(f->track, &uf->track);
470                 err |= __put_user(f->maxblock, &uf->maxblock);
471                 err |= __put_user(f->maxtrack, &uf->maxtrack);
472                 err |= __put_user(f->generation, &uf->generation);
473                 err |= __put_user(f->keep_data, &uf->keep_data);
474                 err |= __put_user(f->fd_ref, &uf->fd_ref);
475                 err |= __put_user(f->fd_device, &uf->fd_device);
476                 err |= __put_user(f->last_checked, &uf->last_checked);
477                 err |= __put_user((u64)f->dmabuf, &uf->dmabuf);
478                 err |= __put_user((u64)f->bufblocks, &uf->bufblocks);
479                 break;
480         }
481         case FDGETFDCSTAT32:
482         {
483                 struct compat_floppy_fdc_state __user *uf;
484                 struct floppy_fdc_state *f = karg;
485 
486                 uf = compat_ptr(arg);
487                 err = __put_user(f->spec1, &uf->spec1);
488                 err |= __put_user(f->spec2, &uf->spec2);
489                 err |= __put_user(f->dtr, &uf->dtr);
490                 err |= __put_user(f->version, &uf->version);
491                 err |= __put_user(f->dor, &uf->dor);
492                 err |= __put_user(f->address, &uf->address);
493                 err |= __copy_to_user((char __user *)&uf->address + sizeof(uf->address),
494                                    (char *)&f->address + sizeof(f->address), sizeof(int));
495                 err |= __put_user(f->driver_version, &uf->driver_version);
496                 err |= __copy_to_user(uf->track, f->track, sizeof(f->track));
497                 break;
498         }
499         case FDWERRORGET32:
500         {
501                 struct compat_floppy_write_errors __user *uf;
502                 struct floppy_write_errors *f = karg;
503 
504                 uf = compat_ptr(arg);
505                 err = __put_user(f->write_errors, &uf->write_errors);
506                 err |= __put_user(f->first_error_sector, &uf->first_error_sector);
507                 err |= __put_user(f->first_error_generation, &uf->first_error_generation);
508                 err |= __put_user(f->last_error_sector, &uf->last_error_sector);
509                 err |= __put_user(f->last_error_generation, &uf->last_error_generation);
510                 err |= __put_user(f->badness, &uf->badness);
511                 break;
512         }
513         default:
514                 break;
515         }
516         if (err)
517                 err = -EFAULT;
518 
519 out:
520         kfree(karg);
521         return err;
522 }
523 
524 static int compat_blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
525                         unsigned cmd, unsigned long arg)
526 {
527         switch (cmd) {
528         case HDIO_GET_UNMASKINTR:
529         case HDIO_GET_MULTCOUNT:
530         case HDIO_GET_KEEPSETTINGS:
531         case HDIO_GET_32BIT:
532         case HDIO_GET_NOWERR:
533         case HDIO_GET_DMA:
534         case HDIO_GET_NICE:
535         case HDIO_GET_WCACHE:
536         case HDIO_GET_ACOUSTIC:
537         case HDIO_GET_ADDRESS:
538         case HDIO_GET_BUSSTATE:
539                 return compat_hdio_ioctl(bdev, mode, cmd, arg);
540         case FDSETPRM32:
541         case FDDEFPRM32:
542         case FDGETPRM32:
543         case FDSETDRVPRM32:
544         case FDGETDRVPRM32:
545         case FDGETDRVSTAT32:
546         case FDPOLLDRVSTAT32:
547         case FDGETFDCSTAT32:
548         case FDWERRORGET32:
549                 return compat_fd_ioctl(bdev, mode, cmd, arg);
550         case CDROMREADAUDIO:
551                 return compat_cdrom_read_audio(bdev, mode, cmd, arg);
552         case CDROM_SEND_PACKET:
553                 return compat_cdrom_generic_command(bdev, mode, cmd, arg);
554 
555         /*
556          * No handler required for the ones below, we just need to
557          * convert arg to a 64 bit pointer.
558          */
559         case BLKSECTSET:
560         /*
561          * 0x03 -- HD/IDE ioctl's used by hdparm and friends.
562          *         Some need translations, these do not.
563          */
564         case HDIO_GET_IDENTITY:
565         case HDIO_DRIVE_TASK:
566         case HDIO_DRIVE_CMD:
567         /* 0x330 is reserved -- it used to be HDIO_GETGEO_BIG */
568         case 0x330:
569         /* 0x02 -- Floppy ioctls */
570         case FDMSGON:
571         case FDMSGOFF:
572         case FDSETEMSGTRESH:
573         case FDFLUSH:
574         case FDWERRORCLR:
575         case FDSETMAXERRS:
576         case FDGETMAXERRS:
577         case FDGETDRVTYP:
578         case FDEJECT:
579         case FDCLRPRM:
580         case FDFMTBEG:
581         case FDFMTEND:
582         case FDRESET:
583         case FDTWADDLE:
584         case FDFMTTRK:
585         case FDRAWCMD:
586         /* CDROM stuff */
587         case CDROMPAUSE:
588         case CDROMRESUME:
589         case CDROMPLAYMSF:
590         case CDROMPLAYTRKIND:
591         case CDROMREADTOCHDR:
592         case CDROMREADTOCENTRY:
593         case CDROMSTOP:
594         case CDROMSTART:
595         case CDROMEJECT:
596         case CDROMVOLCTRL:
597         case CDROMSUBCHNL:
598         case CDROMMULTISESSION:
599         case CDROM_GET_MCN:
600         case CDROMRESET:
601         case CDROMVOLREAD:
602         case CDROMSEEK:
603         case CDROMPLAYBLK:
604         case CDROMCLOSETRAY:
605         case CDROM_DISC_STATUS:
606         case CDROM_CHANGER_NSLOTS:
607         case CDROM_GET_CAPABILITY:
608         /* Ignore cdrom.h about these next 5 ioctls, they absolutely do
609          * not take a struct cdrom_read, instead they take a struct cdrom_msf
610          * which is compatible.
611          */
612         case CDROMREADMODE2:
613         case CDROMREADMODE1:
614         case CDROMREADRAW:
615         case CDROMREADCOOKED:
616         case CDROMREADALL:
617         /* DVD ioctls */
618         case DVD_READ_STRUCT:
619         case DVD_WRITE_STRUCT:
620         case DVD_AUTH:
621                 arg = (unsigned long)compat_ptr(arg);
622         /* These intepret arg as an unsigned long, not as a pointer,
623          * so we must not do compat_ptr() conversion. */
624         case HDIO_SET_MULTCOUNT:
625         case HDIO_SET_UNMASKINTR:
626         case HDIO_SET_KEEPSETTINGS:
627         case HDIO_SET_32BIT:
628         case HDIO_SET_NOWERR:
629         case HDIO_SET_DMA:
630         case HDIO_SET_PIO_MODE:
631         case HDIO_SET_NICE:
632         case HDIO_SET_WCACHE:
633         case HDIO_SET_ACOUSTIC:
634         case HDIO_SET_BUSSTATE:
635         case HDIO_SET_ADDRESS:
636         case CDROMEJECT_SW:
637         case CDROM_SET_OPTIONS:
638         case CDROM_CLEAR_OPTIONS:
639         case CDROM_SELECT_SPEED:
640         case CDROM_SELECT_DISC:
641         case CDROM_MEDIA_CHANGED:
642         case CDROM_DRIVE_STATUS:
643         case CDROM_LOCKDOOR:
644         case CDROM_DEBUG:
645                 break;
646         default:
647                 /* unknown ioctl number */
648                 return -ENOIOCTLCMD;
649         }
650 
651         return __blkdev_driver_ioctl(bdev, mode, cmd, arg);
652 }
653 
654 /* Most of the generic ioctls are handled in the normal fallback path.
655    This assumes the blkdev's low level compat_ioctl always returns
656    ENOIOCTLCMD for unknown ioctls. */
657 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
658 {
659         int ret = -ENOIOCTLCMD;
660         struct inode *inode = file->f_mapping->host;
661         struct block_device *bdev = inode->i_bdev;
662         struct gendisk *disk = bdev->bd_disk;
663         fmode_t mode = file->f_mode;
664         struct backing_dev_info *bdi;
665         loff_t size;
666         unsigned int max_sectors;
667 
668         /*
669          * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
670          * to updated it before every ioctl.
671          */
672         if (file->f_flags & O_NDELAY)
673                 mode |= FMODE_NDELAY;
674         else
675                 mode &= ~FMODE_NDELAY;
676 
677         switch (cmd) {
678         case HDIO_GETGEO:
679                 return compat_hdio_getgeo(disk, bdev, compat_ptr(arg));
680         case BLKPBSZGET:
681                 return compat_put_uint(arg, bdev_physical_block_size(bdev));
682         case BLKIOMIN:
683                 return compat_put_uint(arg, bdev_io_min(bdev));
684         case BLKIOOPT:
685                 return compat_put_uint(arg, bdev_io_opt(bdev));
686         case BLKALIGNOFF:
687                 return compat_put_int(arg, bdev_alignment_offset(bdev));
688         case BLKDISCARDZEROES:
689                 return compat_put_uint(arg, bdev_discard_zeroes_data(bdev));
690         case BLKFLSBUF:
691         case BLKROSET:
692         case BLKDISCARD:
693         case BLKSECDISCARD:
694         case BLKZEROOUT:
695         /*
696          * the ones below are implemented in blkdev_locked_ioctl,
697          * but we call blkdev_ioctl, which gets the lock for us
698          */
699         case BLKRRPART:
700                 return blkdev_ioctl(bdev, mode, cmd,
701                                 (unsigned long)compat_ptr(arg));
702         case BLKBSZSET_32:
703                 return blkdev_ioctl(bdev, mode, BLKBSZSET,
704                                 (unsigned long)compat_ptr(arg));
705         case BLKPG:
706                 return compat_blkpg_ioctl(bdev, mode, cmd, compat_ptr(arg));
707         case BLKRAGET:
708         case BLKFRAGET:
709                 if (!arg)
710                         return -EINVAL;
711                 bdi = blk_get_backing_dev_info(bdev);
712                 return compat_put_long(arg,
713                                        (bdi->ra_pages * PAGE_SIZE) / 512);
714         case BLKROGET: /* compatible */
715                 return compat_put_int(arg, bdev_read_only(bdev) != 0);
716         case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
717                 return compat_put_int(arg, block_size(bdev));
718         case BLKSSZGET: /* get block device hardware sector size */
719                 return compat_put_int(arg, bdev_logical_block_size(bdev));
720         case BLKSECTGET:
721                 max_sectors = min_t(unsigned int, USHRT_MAX,
722                                     queue_max_sectors(bdev_get_queue(bdev)));
723                 return compat_put_ushort(arg, max_sectors);
724         case BLKROTATIONAL:
725                 return compat_put_ushort(arg,
726                                          !blk_queue_nonrot(bdev_get_queue(bdev)));
727         case BLKRASET: /* compatible, but no compat_ptr (!) */
728         case BLKFRASET:
729                 if (!capable(CAP_SYS_ADMIN))
730                         return -EACCES;
731                 bdi = blk_get_backing_dev_info(bdev);
732                 bdi->ra_pages = (arg * 512) / PAGE_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 }
757 

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