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         /*
  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 }