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/syscalls.h>
  10 #include <linux/smp_lock.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_long(unsigned long arg, long val)
  25 {
  26         return put_user(val, (compat_long_t __user *)compat_ptr(arg));
  27 }
  28
  29 static int compat_put_ulong(unsigned long arg, compat_ulong_t val)
  30 {
  31         return put_user(val, (compat_ulong_t __user *)compat_ptr(arg));
  32 }
  33
  34 static int compat_put_u64(unsigned long arg, u64 val)
  35 {
  36         return put_user(val, (compat_u64 __user *)compat_ptr(arg));
  37 }
  38
  39 struct compat_hd_geometry {
  40         unsigned char heads;
  41         unsigned char sectors;
  42         unsigned short cylinders;
  43         u32 start;
  44 };
  45
  46 static int compat_hdio_getgeo(struct gendisk *disk, struct block_device *bdev,
  47                         struct compat_hd_geometry __user *ugeo)
  48 {
  49         struct hd_geometry geo;
  50         int ret;
  51
  52         if (!ugeo)
  53                 return -EINVAL;
  54         if (!disk->fops->getgeo)
  55                 return -ENOTTY;
  56
  57         /*
  58          * We need to set the startsect first, the driver may
  59          * want to override it.
  60          */
  61         geo.start = get_start_sect(bdev);
  62         ret = disk->fops->getgeo(bdev, &geo);
  63         if (ret)
  64                 return ret;
  65
  66         ret = copy_to_user(ugeo, &geo, 4);
  67         ret |= __put_user(geo.start, &ugeo->start);
  68         if (ret)
  69                 ret = -EFAULT;
  70
  71         return ret;
  72 }
  73
  74 static int compat_hdio_ioctl(struct block_device *bdev, fmode_t mode,
  75                 unsigned int cmd, unsigned long arg)
  76 {
  77         mm_segment_t old_fs = get_fs();
  78         unsigned long kval;
  79         unsigned int __user *uvp;
  80         int error;
  81
  82         set_fs(KERNEL_DS);
  83         error = __blkdev_driver_ioctl(bdev, mode,
  84                                 cmd, (unsigned long)(&kval));
  85         set_fs(old_fs);
  86
  87         if (error == 0) {
  88                 uvp = compat_ptr(arg);
  89                 if (put_user(kval, uvp))
  90                         error = -EFAULT;
  91         }
  92         return error;
  93 }
  94
  95 struct compat_cdrom_read_audio {
  96         union cdrom_addr        addr;
  97         u8                      addr_format;
  98         compat_int_t            nframes;
  99         compat_caddr_t          buf;
 100 };
 101
 102 struct compat_cdrom_generic_command {
 103         unsigned char   cmd[CDROM_PACKET_SIZE];
 104         compat_caddr_t  buffer;
 105         compat_uint_t   buflen;
 106         compat_int_t    stat;
 107         compat_caddr_t  sense;
 108         unsigned char   data_direction;
 109         compat_int_t    quiet;
 110         compat_int_t    timeout;
 111         compat_caddr_t  reserved[1];
 112 };
 113
 114 static int compat_cdrom_read_audio(struct block_device *bdev, fmode_t mode,
 115                 unsigned int cmd, unsigned long arg)
 116 {
 117         struct cdrom_read_audio __user *cdread_audio;
 118         struct compat_cdrom_read_audio __user *cdread_audio32;
 119         __u32 data;
 120         void __user *datap;
 121
 122         cdread_audio = compat_alloc_user_space(sizeof(*cdread_audio));
 123         cdread_audio32 = compat_ptr(arg);
 124
 125         if (copy_in_user(&cdread_audio->addr,
 126                          &cdread_audio32->addr,
 127                          (sizeof(*cdread_audio32) -
 128                           sizeof(compat_caddr_t))))
 129                 return -EFAULT;
 130
 131         if (get_user(data, &cdread_audio32->buf))
 132                 return -EFAULT;
 133         datap = compat_ptr(data);
 134         if (put_user(datap, &cdread_audio->buf))
 135                 return -EFAULT;
 136
 137         return __blkdev_driver_ioctl(bdev, mode, cmd,
 138                         (unsigned long)cdread_audio);
 139 }
 140
 141 static int compat_cdrom_generic_command(struct block_device *bdev, fmode_t mode,
 142                 unsigned int cmd, unsigned long arg)
 143 {
 144         struct cdrom_generic_command __user *cgc;
 145         struct compat_cdrom_generic_command __user *cgc32;
 146         u32 data;
 147         unsigned char dir;
 148         int itmp;
 149
 150         cgc = compat_alloc_user_space(sizeof(*cgc));
 151         cgc32 = compat_ptr(arg);
 152
 153         if (copy_in_user(&cgc->cmd, &cgc32->cmd, sizeof(cgc->cmd)) ||
 154             get_user(data, &cgc32->buffer) ||
 155             put_user(compat_ptr(data), &cgc->buffer) ||
 156             copy_in_user(&cgc->buflen, &cgc32->buflen,
 157                          (sizeof(unsigned int) + sizeof(int))) ||
 158             get_user(data, &cgc32->sense) ||
 159             put_user(compat_ptr(data), &cgc->sense) ||
 160             get_user(dir, &cgc32->data_direction) ||
 161             put_user(dir, &cgc->data_direction) ||
 162             get_user(itmp, &cgc32->quiet) ||
 163             put_user(itmp, &cgc->quiet) ||
 164             get_user(itmp, &cgc32->timeout) ||
 165             put_user(itmp, &cgc->timeout) ||
 166             get_user(data, &cgc32->reserved[0]) ||
 167             put_user(compat_ptr(data), &cgc->reserved[0]))
 168                 return -EFAULT;
 169
 170         return __blkdev_driver_ioctl(bdev, mode, cmd, (unsigned long)cgc);
 171 }
 172
 173 struct compat_blkpg_ioctl_arg {
 174         compat_int_t op;
 175         compat_int_t flags;
 176         compat_int_t datalen;
 177         compat_caddr_t data;
 178 };
 179
 180 static int compat_blkpg_ioctl(struct block_device *bdev, fmode_t mode,
 181                 unsigned int cmd, struct compat_blkpg_ioctl_arg __user *ua32)
 182 {
 183         struct blkpg_ioctl_arg __user *a = compat_alloc_user_space(sizeof(*a));
 184         compat_caddr_t udata;
 185         compat_int_t n;
 186         int err;
 187
 188         err = get_user(n, &ua32->op);
 189         err |= put_user(n, &a->op);
 190         err |= get_user(n, &ua32->flags);
 191         err |= put_user(n, &a->flags);
 192         err |= get_user(n, &ua32->datalen);
 193         err |= put_user(n, &a->datalen);
 194         err |= get_user(udata, &ua32->data);
 195         err |= put_user(compat_ptr(udata), &a->data);
 196         if (err)
 197                 return err;
 198
 199         return blkdev_ioctl(bdev, mode, cmd, (unsigned long)a);
 200 }
 201
 202 #define BLKBSZGET_32            _IOR(0x12, 112, int)
 203 #define BLKBSZSET_32            _IOW(0x12, 113, int)
 204 #define BLKGETSIZE64_32         _IOR(0x12, 114, int)
 205
 206 struct compat_floppy_struct {
 207         compat_uint_t   size;
 208         compat_uint_t   sect;
 209         compat_uint_t   head;
 210         compat_uint_t   track;
 211         compat_uint_t   stretch;
 212         unsigned char   gap;
 213         unsigned char   rate;
 214         unsigned char   spec1;
 215         unsigned char   fmt_gap;
 216         const compat_caddr_t name;
 217 };
 218
 219 struct compat_floppy_drive_params {
 220         char            cmos;
 221         compat_ulong_t  max_dtr;
 222         compat_ulong_t  hlt;
 223         compat_ulong_t  hut;
 224         compat_ulong_t  srt;
 225         compat_ulong_t  spinup;
 226         compat_ulong_t  spindown;
 227         unsigned char   spindown_offset;
 228         unsigned char   select_delay;
 229         unsigned char   rps;
 230         unsigned char   tracks;
 231         compat_ulong_t  timeout;
 232         unsigned char   interleave_sect;
 233         struct floppy_max_errors max_errors;
 234         char            flags;
 235         char            read_track;
 236         short           autodetect[8];
 237         compat_int_t    checkfreq;
 238         compat_int_t    native_format;
 239 };
 240
 241 struct compat_floppy_drive_struct {
 242         signed char     flags;
 243         compat_ulong_t  spinup_date;
 244         compat_ulong_t  select_date;
 245         compat_ulong_t  first_read_date;
 246         short           probed_format;
 247         short           track;
 248         short           maxblock;
 249         short           maxtrack;
 250         compat_int_t    generation;
 251         compat_int_t    keep_data;
 252         compat_int_t    fd_ref;
 253         compat_int_t    fd_device;
 254         compat_int_t    last_checked;
 255         compat_caddr_t dmabuf;
 256         compat_int_t    bufblocks;
 257 };
 258
 259 struct compat_floppy_fdc_state {
 260         compat_int_t    spec1;
 261         compat_int_t    spec2;
 262         compat_int_t    dtr;
 263         unsigned char   version;
 264         unsigned char   dor;
 265         compat_ulong_t  address;
 266         unsigned int    rawcmd:2;
 267         unsigned int    reset:1;
 268         unsigned int    need_configure:1;
 269         unsigned int    perp_mode:2;
 270         unsigned int    has_fifo:1;
 271         unsigned int    driver_version;
 272         unsigned char   track[4];
 273 };
 274
 275 struct compat_floppy_write_errors {
 276         unsigned int    write_errors;
 277         compat_ulong_t  first_error_sector;
 278         compat_int_t    first_error_generation;
 279         compat_ulong_t  last_error_sector;
 280         compat_int_t    last_error_generation;
 281         compat_uint_t   badness;
 282 };
 283
 284 #define FDSETPRM32 _IOW(2, 0x42, struct compat_floppy_struct)
 285 #define FDDEFPRM32 _IOW(2, 0x43, struct compat_floppy_struct)
 286 #define FDGETPRM32 _IOR(2, 0x04, struct compat_floppy_struct)
 287 #define FDSETDRVPRM32 _IOW(2, 0x90, struct compat_floppy_drive_params)
 288 #define FDGETDRVPRM32 _IOR(2, 0x11, struct compat_floppy_drive_params)
 289 #define FDGETDRVSTAT32 _IOR(2, 0x12, struct compat_floppy_drive_struct)
 290 #define FDPOLLDRVSTAT32 _IOR(2, 0x13, struct compat_floppy_drive_struct)
 291 #define FDGETFDCSTAT32 _IOR(2, 0x15, struct compat_floppy_fdc_state)
 292 #define FDWERRORGET32  _IOR(2, 0x17, struct compat_floppy_write_errors)
 293
 294 static struct {
 295         unsigned int    cmd32;
 296         unsigned int    cmd;
 297 } fd_ioctl_trans_table[] = {
 298         { FDSETPRM32, FDSETPRM },
 299         { FDDEFPRM32, FDDEFPRM },
 300         { FDGETPRM32, FDGETPRM },
 301         { FDSETDRVPRM32, FDSETDRVPRM },
 302         { FDGETDRVPRM32, FDGETDRVPRM },
 303         { FDGETDRVSTAT32, FDGETDRVSTAT },
 304         { FDPOLLDRVSTAT32, FDPOLLDRVSTAT },
 305         { FDGETFDCSTAT32, FDGETFDCSTAT },
 306         { FDWERRORGET32, FDWERRORGET }
 307 };
 308
 309 #define NR_FD_IOCTL_TRANS ARRAY_SIZE(fd_ioctl_trans_table)
 310
 311 static int compat_fd_ioctl(struct block_device *bdev, fmode_t mode,
 312                 unsigned int cmd, unsigned long arg)
 313 {
 314         mm_segment_t old_fs = get_fs();
 315         void *karg = NULL;
 316         unsigned int kcmd = 0;
 317         int i, err;
 318
 319         for (i = 0; i < NR_FD_IOCTL_TRANS; i++)
 320                 if (cmd == fd_ioctl_trans_table[i].cmd32) {
 321                         kcmd = fd_ioctl_trans_table[i].cmd;
 322                         break;
 323                 }
 324         if (!kcmd)
 325                 return -EINVAL;
 326
 327         switch (cmd) {
 328         case FDSETPRM32:
 329         case FDDEFPRM32:
 330         case FDGETPRM32:
 331         {
 332                 compat_uptr_t name;
 333                 struct compat_floppy_struct __user *uf;
 334                 struct floppy_struct *f;
 335
 336                 uf = compat_ptr(arg);
 337                 f = karg = kmalloc(sizeof(struct floppy_struct), GFP_KERNEL);
 338                 if (!karg)
 339                         return -ENOMEM;
 340                 if (cmd == FDGETPRM32)
 341                         break;
 342                 err = __get_user(f->size, &uf->size);
 343                 err |= __get_user(f->sect, &uf->sect);
 344                 err |= __get_user(f->head, &uf->head);
 345                 err |= __get_user(f->track, &uf->track);
 346                 err |= __get_user(f->stretch, &uf->stretch);
 347                 err |= __get_user(f->gap, &uf->gap);
 348                 err |= __get_user(f->rate, &uf->rate);
 349                 err |= __get_user(f->spec1, &uf->spec1);
 350                 err |= __get_user(f->fmt_gap, &uf->fmt_gap);
 351                 err |= __get_user(name, &uf->name);
 352                 f->name = compat_ptr(name);
 353                 if (err) {
 354                         err = -EFAULT;
 355                         goto out;
 356                 }
 357                 break;
 358         }
 359         case FDSETDRVPRM32:
 360         case FDGETDRVPRM32:
 361         {
 362                 struct compat_floppy_drive_params __user *uf;
 363                 struct floppy_drive_params *f;
 364
 365                 uf = compat_ptr(arg);
 366                 f = karg = kmalloc(sizeof(struct floppy_drive_params), GFP_KERNEL);
 367                 if (!karg)
 368                         return -ENOMEM;
 369                 if (cmd == FDGETDRVPRM32)
 370                         break;
 371                 err = __get_user(f->cmos, &uf->cmos);
 372                 err |= __get_user(f->max_dtr, &uf->max_dtr);
 373                 err |= __get_user(f->hlt, &uf->hlt);
 374                 err |= __get_user(f->hut, &uf->hut);
 375                 err |= __get_user(f->srt, &uf->srt);
 376                 err |= __get_user(f->spinup, &uf->spinup);
 377                 err |= __get_user(f->spindown, &uf->spindown);
 378                 err |= __get_user(f->spindown_offset, &uf->spindown_offset);
 379                 err |= __get_user(f->select_delay, &uf->select_delay);
 380                 err |= __get_user(f->rps, &uf->rps);
 381                 err |= __get_user(f->tracks, &uf->tracks);
 382                 err |= __get_user(f->timeout, &uf->timeout);
 383                 err |= __get_user(f->interleave_sect, &uf->interleave_sect);
 384                 err |= __copy_from_user(&f->max_errors, &uf->max_errors, sizeof(f->max_errors));
 385                 err |= __get_user(f->flags, &uf->flags);
 386                 err |= __get_user(f->read_track, &uf->read_track);
 387                 err |= __copy_from_user(f->autodetect, uf->autodetect, sizeof(f->autodetect));
 388                 err |= __get_user(f->checkfreq, &uf->checkfreq);
 389                 err |= __get_user(f->native_format, &uf->native_format);
 390                 if (err) {
 391                         err = -EFAULT;
 392                         goto out;
 393                 }
 394                 break;
 395         }
 396         case FDGETDRVSTAT32:
 397         case FDPOLLDRVSTAT32:
 398                 karg = kmalloc(sizeof(struct floppy_drive_struct), GFP_KERNEL);
 399                 if (!karg)
 400                         return -ENOMEM;
 401                 break;
 402         case FDGETFDCSTAT32:
 403                 karg = kmalloc(sizeof(struct floppy_fdc_state), GFP_KERNEL);
 404                 if (!karg)
 405                         return -ENOMEM;
 406                 break;
 407         case FDWERRORGET32:
 408                 karg = kmalloc(sizeof(struct floppy_write_errors), GFP_KERNEL);
 409                 if (!karg)
 410                         return -ENOMEM;
 411                 break;
 412         default:
 413                 return -EINVAL;
 414         }
 415         set_fs(KERNEL_DS);
 416         err = __blkdev_driver_ioctl(bdev, mode, kcmd, (unsigned long)karg);
 417         set_fs(old_fs);
 418         if (err)
 419                 goto out;
 420         switch (cmd) {
 421         case FDGETPRM32:
 422         {
 423                 struct floppy_struct *f = karg;
 424                 struct compat_floppy_struct __user *uf = compat_ptr(arg);
 425
 426                 err = __put_user(f->size, &uf->size);
 427                 err |= __put_user(f->sect, &uf->sect);
 428                 err |= __put_user(f->head, &uf->head);
 429                 err |= __put_user(f->track, &uf->track);
 430                 err |= __put_user(f->stretch, &uf->stretch);
 431                 err |= __put_user(f->gap, &uf->gap);
 432                 err |= __put_user(f->rate, &uf->rate);
 433                 err |= __put_user(f->spec1, &uf->spec1);
 434                 err |= __put_user(f->fmt_gap, &uf->fmt_gap);
 435                 err |= __put_user((u64)f->name, (compat_caddr_t __user *)&uf->name);
 436                 break;
 437         }
 438         case FDGETDRVPRM32:
 439         {
 440                 struct compat_floppy_drive_params __user *uf;
 441                 struct floppy_drive_params *f = karg;
 442
 443                 uf = compat_ptr(arg);
 444                 err = __put_user(f->cmos, &uf->cmos);
 445                 err |= __put_user(f->max_dtr, &uf->max_dtr);
 446                 err |= __put_user(f->hlt, &uf->hlt);
 447                 err |= __put_user(f->hut, &uf->hut);
 448                 err |= __put_user(f->srt, &uf->srt);
 449                 err |= __put_user(f->spinup, &uf->spinup);
 450                 err |= __put_user(f->spindown, &uf->spindown);
 451                 err |= __put_user(f->spindown_offset, &uf->spindown_offset);
 452                 err |= __put_user(f->select_delay, &uf->select_delay);
 453                 err |= __put_user(f->rps, &uf->rps);
 454                 err |= __put_user(f->tracks, &uf->tracks);
 455                 err |= __put_user(f->timeout, &uf->timeout);
 456                 err |= __put_user(f->interleave_sect, &uf->interleave_sect);
 457                 err |= __copy_to_user(&uf->max_errors, &f->max_errors, sizeof(f->max_errors));
 458                 err |= __put_user(f->flags, &uf->flags);
 459                 err |= __put_user(f->read_track, &uf->read_track);
 460                 err |= __copy_to_user(uf->autodetect, f->autodetect, sizeof(f->autodetect));
 461                 err |= __put_user(f->checkfreq, &uf->checkfreq);
 462                 err |= __put_user(f->native_format, &uf->native_format);
 463                 break;
 464         }
 465         case FDGETDRVSTAT32:
 466         case FDPOLLDRVSTAT32:
 467         {
 468                 struct compat_floppy_drive_struct __user *uf;
 469                 struct floppy_drive_struct *f = karg;
 470
 471                 uf = compat_ptr(arg);
 472                 err = __put_user(f->flags, &uf->flags);
 473                 err |= __put_user(f->spinup_date, &uf->spinup_date);
 474                 err |= __put_user(f->select_date, &uf->select_date);
 475                 err |= __put_user(f->first_read_date, &uf->first_read_date);
 476                 err |= __put_user(f->probed_format, &uf->probed_format);
 477                 err |= __put_user(f->track, &uf->track);
 478                 err |= __put_user(f->maxblock, &uf->maxblock);
 479                 err |= __put_user(f->maxtrack, &uf->maxtrack);
 480                 err |= __put_user(f->generation, &uf->generation);
 481                 err |= __put_user(f->keep_data, &uf->keep_data);
 482                 err |= __put_user(f->fd_ref, &uf->fd_ref);
 483                 err |= __put_user(f->fd_device, &uf->fd_device);
 484                 err |= __put_user(f->last_checked, &uf->last_checked);
 485                 err |= __put_user((u64)f->dmabuf, &uf->dmabuf);
 486                 err |= __put_user((u64)f->bufblocks, &uf->bufblocks);
 487                 break;
 488         }
 489         case FDGETFDCSTAT32:
 490         {
 491                 struct compat_floppy_fdc_state __user *uf;
 492                 struct floppy_fdc_state *f = karg;
 493
 494                 uf = compat_ptr(arg);
 495                 err = __put_user(f->spec1, &uf->spec1);
 496                 err |= __put_user(f->spec2, &uf->spec2);
 497                 err |= __put_user(f->dtr, &uf->dtr);
 498                 err |= __put_user(f->version, &uf->version);
 499                 err |= __put_user(f->dor, &uf->dor);
 500                 err |= __put_user(f->address, &uf->address);
 501                 err |= __copy_to_user((char __user *)&uf->address + sizeof(uf->address),
 502                                    (char *)&f->address + sizeof(f->address), sizeof(int));
 503                 err |= __put_user(f->driver_version, &uf->driver_version);
 504                 err |= __copy_to_user(uf->track, f->track, sizeof(f->track));
 505                 break;
 506         }
 507         case FDWERRORGET32:
 508         {
 509                 struct compat_floppy_write_errors __user *uf;
 510                 struct floppy_write_errors *f = karg;
 511
 512                 uf = compat_ptr(arg);
 513                 err = __put_user(f->write_errors, &uf->write_errors);
 514                 err |= __put_user(f->first_error_sector, &uf->first_error_sector);
 515                 err |= __put_user(f->first_error_generation, &uf->first_error_generation);
 516                 err |= __put_user(f->last_error_sector, &uf->last_error_sector);
 517                 err |= __put_user(f->last_error_generation, &uf->last_error_generation);
 518                 err |= __put_user(f->badness, &uf->badness);
 519                 break;
 520         }
 521         default:
 522                 break;
 523         }
 524         if (err)
 525                 err = -EFAULT;
 526
 527 out:
 528         kfree(karg);
 529         return err;
 530 }
 531
 532 struct compat_blk_user_trace_setup {
 533         char name[32];
 534         u16 act_mask;
 535         u32 buf_size;
 536         u32 buf_nr;
 537         compat_u64 start_lba;
 538         compat_u64 end_lba;
 539         u32 pid;
 540 };
 541 #define BLKTRACESETUP32 _IOWR(0x12, 115, struct compat_blk_user_trace_setup)
 542
 543 static int compat_blk_trace_setup(struct block_device *bdev, char __user *arg)
 544 {
 545         struct blk_user_trace_setup buts;
 546         struct compat_blk_user_trace_setup cbuts;
 547         struct request_queue *q;
 548         char b[BDEVNAME_SIZE];
 549         int ret;
 550
 551         q = bdev_get_queue(bdev);
 552         if (!q)
 553                 return -ENXIO;
 554
 555         if (copy_from_user(&cbuts, arg, sizeof(cbuts)))
 556                 return -EFAULT;
 557
 558         bdevname(bdev, b);
 559
 560         buts = (struct blk_user_trace_setup) {
 561                 .act_mask = cbuts.act_mask,
 562                 .buf_size = cbuts.buf_size,
 563                 .buf_nr = cbuts.buf_nr,
 564                 .start_lba = cbuts.start_lba,
 565                 .end_lba = cbuts.end_lba,
 566                 .pid = cbuts.pid,
 567         };
 568         memcpy(&buts.name, &cbuts.name, 32);
 569
 570         mutex_lock(&bdev->bd_mutex);
 571         ret = do_blk_trace_setup(q, b, bdev->bd_dev, &buts);
 572         mutex_unlock(&bdev->bd_mutex);
 573         if (ret)
 574                 return ret;
 575
 576         if (copy_to_user(arg, &buts.name, 32))
 577                 return -EFAULT;
 578
 579         return 0;
 580 }
 581
 582 static int compat_blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
 583                         unsigned cmd, unsigned long arg)
 584 {
 585         switch (cmd) {
 586         case HDIO_GET_UNMASKINTR:
 587         case HDIO_GET_MULTCOUNT:
 588         case HDIO_GET_KEEPSETTINGS:
 589         case HDIO_GET_32BIT:
 590         case HDIO_GET_NOWERR:
 591         case HDIO_GET_DMA:
 592         case HDIO_GET_NICE:
 593         case HDIO_GET_WCACHE:
 594         case HDIO_GET_ACOUSTIC:
 595         case HDIO_GET_ADDRESS:
 596         case HDIO_GET_BUSSTATE:
 597                 return compat_hdio_ioctl(bdev, mode, cmd, arg);
 598         case FDSETPRM32:
 599         case FDDEFPRM32:
 600         case FDGETPRM32:
 601         case FDSETDRVPRM32:
 602         case FDGETDRVPRM32:
 603         case FDGETDRVSTAT32:
 604         case FDPOLLDRVSTAT32:
 605         case FDGETFDCSTAT32:
 606         case FDWERRORGET32:
 607                 return compat_fd_ioctl(bdev, mode, cmd, arg);
 608         case CDROMREADAUDIO:
 609                 return compat_cdrom_read_audio(bdev, mode, cmd, arg);
 610         case CDROM_SEND_PACKET:
 611                 return compat_cdrom_generic_command(bdev, mode, cmd, arg);
 612
 613         /*
 614          * No handler required for the ones below, we just need to
 615          * convert arg to a 64 bit pointer.
 616          */
 617         case BLKSECTSET:
 618         /*
 619          * 0x03 -- HD/IDE ioctl's used by hdparm and friends.
 620          *         Some need translations, these do not.
 621          */
 622         case HDIO_GET_IDENTITY:
 623         case HDIO_DRIVE_TASK:
 624         case HDIO_DRIVE_CMD:
 625         /* 0x330 is reserved -- it used to be HDIO_GETGEO_BIG */
 626         case 0x330:
 627         /* 0x02 -- Floppy ioctls */
 628         case FDMSGON:
 629         case FDMSGOFF:
 630         case FDSETEMSGTRESH:
 631         case FDFLUSH:
 632         case FDWERRORCLR:
 633         case FDSETMAXERRS:
 634         case FDGETMAXERRS:
 635         case FDGETDRVTYP:
 636         case FDEJECT:
 637         case FDCLRPRM:
 638         case FDFMTBEG:
 639         case FDFMTEND:
 640         case FDRESET:
 641         case FDTWADDLE:
 642         case FDFMTTRK:
 643         case FDRAWCMD:
 644         /* CDROM stuff */
 645         case CDROMPAUSE:
 646         case CDROMRESUME:
 647         case CDROMPLAYMSF:
 648         case CDROMPLAYTRKIND:
 649         case CDROMREADTOCHDR:
 650         case CDROMREADTOCENTRY:
 651         case CDROMSTOP:
 652         case CDROMSTART:
 653         case CDROMEJECT:
 654         case CDROMVOLCTRL:
 655         case CDROMSUBCHNL:
 656         case CDROMMULTISESSION:
 657         case CDROM_GET_MCN:
 658         case CDROMRESET:
 659         case CDROMVOLREAD:
 660         case CDROMSEEK:
 661         case CDROMPLAYBLK:
 662         case CDROMCLOSETRAY:
 663         case CDROM_DISC_STATUS:
 664         case CDROM_CHANGER_NSLOTS:
 665         case CDROM_GET_CAPABILITY:
 666         /* Ignore cdrom.h about these next 5 ioctls, they absolutely do
 667          * not take a struct cdrom_read, instead they take a struct cdrom_msf
 668          * which is compatible.
 669          */
 670         case CDROMREADMODE2:
 671         case CDROMREADMODE1:
 672         case CDROMREADRAW:
 673         case CDROMREADCOOKED:
 674         case CDROMREADALL:
 675         /* DVD ioctls */
 676         case DVD_READ_STRUCT:
 677         case DVD_WRITE_STRUCT:
 678         case DVD_AUTH:
 679                 arg = (unsigned long)compat_ptr(arg);
 680         /* These intepret arg as an unsigned long, not as a pointer,
 681          * so we must not do compat_ptr() conversion. */
 682         case HDIO_SET_MULTCOUNT:
 683         case HDIO_SET_UNMASKINTR:
 684         case HDIO_SET_KEEPSETTINGS:
 685         case HDIO_SET_32BIT:
 686         case HDIO_SET_NOWERR:
 687         case HDIO_SET_DMA:
 688         case HDIO_SET_PIO_MODE:
 689         case HDIO_SET_NICE:
 690         case HDIO_SET_WCACHE:
 691         case HDIO_SET_ACOUSTIC:
 692         case HDIO_SET_BUSSTATE:
 693         case HDIO_SET_ADDRESS:
 694         case CDROMEJECT_SW:
 695         case CDROM_SET_OPTIONS:
 696         case CDROM_CLEAR_OPTIONS:
 697         case CDROM_SELECT_SPEED:
 698         case CDROM_SELECT_DISC:
 699         case CDROM_MEDIA_CHANGED:
 700         case CDROM_DRIVE_STATUS:
 701         case CDROM_LOCKDOOR:
 702         case CDROM_DEBUG:
 703                 break;
 704         default:
 705                 /* unknown ioctl number */
 706                 return -ENOIOCTLCMD;
 707         }
 708
 709         return __blkdev_driver_ioctl(bdev, mode, cmd, arg);
 710 }
 711
 712 /* Most of the generic ioctls are handled in the normal fallback path.
 713    This assumes the blkdev's low level compat_ioctl always returns
 714    ENOIOCTLCMD for unknown ioctls. */
 715 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 716 {
 717         int ret = -ENOIOCTLCMD;
 718         struct inode *inode = file->f_mapping->host;
 719         struct block_device *bdev = inode->i_bdev;
 720         struct gendisk *disk = bdev->bd_disk;
 721         fmode_t mode = file->f_mode;
 722         struct backing_dev_info *bdi;
 723         loff_t size;
 724
 725         /*
 726          * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
 727          * to updated it before every ioctl.
 728          */
 729         if (file->f_flags & O_NDELAY)
 730                 mode |= FMODE_NDELAY;
 731         else
 732                 mode &= ~FMODE_NDELAY;
 733
 734         switch (cmd) {
 735         case HDIO_GETGEO:
 736                 return compat_hdio_getgeo(disk, bdev, compat_ptr(arg));
 737         case BLKFLSBUF:
 738         case BLKROSET:
 739         case BLKDISCARD:
 740         /*
 741          * the ones below are implemented in blkdev_locked_ioctl,
 742          * but we call blkdev_ioctl, which gets the lock for us
 743          */
 744         case BLKRRPART:
 745                 return blkdev_ioctl(bdev, mode, cmd,
 746                                 (unsigned long)compat_ptr(arg));
 747         case BLKBSZSET_32:
 748                 return blkdev_ioctl(bdev, mode, BLKBSZSET,
 749                                 (unsigned long)compat_ptr(arg));
 750         case BLKPG:
 751                 return compat_blkpg_ioctl(bdev, mode, cmd, compat_ptr(arg));
 752         case BLKRAGET:
 753         case BLKFRAGET:
 754                 if (!arg)
 755                         return -EINVAL;
 756                 bdi = blk_get_backing_dev_info(bdev);
 757                 if (bdi == NULL)
 758                         return -ENOTTY;
 759                 return compat_put_long(arg,
 760                                        (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
 761         case BLKROGET: /* compatible */
 762                 return compat_put_int(arg, bdev_read_only(bdev) != 0);
 763         case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
 764                 return compat_put_int(arg, block_size(bdev));
 765         case BLKSSZGET: /* get block device hardware sector size */
 766                 return compat_put_int(arg, bdev_hardsect_size(bdev));
 767         case BLKSECTGET:
 768                 return compat_put_ushort(arg,
 769                                          bdev_get_queue(bdev)->max_sectors);
 770         case BLKRASET: /* compatible, but no compat_ptr (!) */
 771         case BLKFRASET:
 772                 if (!capable(CAP_SYS_ADMIN))
 773                         return -EACCES;
 774                 bdi = blk_get_backing_dev_info(bdev);
 775                 if (bdi == NULL)
 776                         return -ENOTTY;
 777                 bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
 778                 return 0;
 779         case BLKGETSIZE:
 780                 size = bdev->bd_inode->i_size;
 781                 if ((size >> 9) > ~0UL)
 782                         return -EFBIG;
 783                 return compat_put_ulong(arg, size >> 9);
 784
 785         case BLKGETSIZE64_32:
 786                 return compat_put_u64(arg, bdev->bd_inode->i_size);
 787
 788         case BLKTRACESETUP32:
 789                 lock_kernel();
 790                 ret = compat_blk_trace_setup(bdev, compat_ptr(arg));
 791                 unlock_kernel();
 792                 return ret;
 793         case BLKTRACESTART: /* compatible */
 794         case BLKTRACESTOP:  /* compatible */
 795         case BLKTRACETEARDOWN: /* compatible */
 796                 lock_kernel();
 797                 ret = blk_trace_ioctl(bdev, cmd, compat_ptr(arg));
 798                 unlock_kernel();
 799                 return ret;
 800         default:
 801                 if (disk->fops->compat_ioctl)
 802                         ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
 803                 if (ret == -ENOIOCTLCMD)
 804                         ret = compat_blkdev_driver_ioctl(bdev, mode, cmd, arg);
 805                 return ret;
 806         }
 807 }