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/smp_lock.h>
  12 #include <linux/types.h>
  13 #include <linux/uaccess.h>
  14
  15 static int compat_put_ushort(unsigned long arg, unsigned short val)
  16 {
  17         return put_user(val, (unsigned short __user *)compat_ptr(arg));
  18 }
  19
  20 static int compat_put_int(unsigned long arg, int val)
  21 {
  22         return put_user(val, (compat_int_t __user *)compat_ptr(arg));
  23 }
  24
  25 static int compat_put_uint(unsigned long arg, unsigned int val)
  26 {
  27         return put_user(val, (compat_uint_t __user *)compat_ptr(arg));
  28 }
  29
  30 static int compat_put_long(unsigned long arg, long val)
  31 {
  32         return put_user(val, (compat_long_t __user *)compat_ptr(arg));
  33 }
  34
  35 static int compat_put_ulong(unsigned long arg, compat_ulong_t val)
  36 {
  37         return put_user(val, (compat_ulong_t __user *)compat_ptr(arg));
  38 }
  39
  40 static int compat_put_u64(unsigned long arg, u64 val)
  41 {
  42         return put_user(val, (compat_u64 __user *)compat_ptr(arg));
  43 }
  44
  45 struct compat_hd_geometry {
  46         unsigned char heads;
  47         unsigned char sectors;
  48         unsigned short cylinders;
  49         u32 start;
  50 };
  51
  52 static int compat_hdio_getgeo(struct gendisk *disk, struct block_device *bdev,
  53                         struct compat_hd_geometry __user *ugeo)
  54 {
  55         struct hd_geometry geo;
  56         int ret;
  57
  58         if (!ugeo)
  59                 return -EINVAL;
  60         if (!disk->fops->getgeo)
  61                 return -ENOTTY;
  62
  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_struct {
 213         compat_uint_t   size;
 214         compat_uint_t   sect;
 215         compat_uint_t   head;
 216         compat_uint_t   track;
 217         compat_uint_t   stretch;
 218         unsigned char   gap;
 219         unsigned char   rate;
 220         unsigned char   spec1;
 221         unsigned char   fmt_gap;
 222         const compat_caddr_t name;
 223 };
 224
 225 struct compat_floppy_drive_params {
 226         char            cmos;
 227         compat_ulong_t  max_dtr;
 228         compat_ulong_t  hlt;
 229         compat_ulong_t  hut;
 230         compat_ulong_t  srt;
 231         compat_ulong_t  spinup;
 232         compat_ulong_t  spindown;
 233         unsigned char   spindown_offset;
 234         unsigned char   select_delay;
 235         unsigned char   rps;
 236         unsigned char   tracks;
 237         compat_ulong_t  timeout;
 238         unsigned char   interleave_sect;
 239         struct floppy_max_errors max_errors;
 240         char            flags;
 241         char            read_track;
 242         short           autodetect[8];
 243         compat_int_t    checkfreq;
 244         compat_int_t    native_format;
 245 };
 246
 247 struct compat_floppy_drive_struct {
 248         signed char     flags;
 249         compat_ulong_t  spinup_date;
 250         compat_ulong_t  select_date;
 251         compat_ulong_t  first_read_date;
 252         short           probed_format;
 253         short           track;
 254         short           maxblock;
 255         short           maxtrack;
 256         compat_int_t    generation;
 257         compat_int_t    keep_data;
 258         compat_int_t    fd_ref;
 259         compat_int_t    fd_device;
 260         compat_int_t    last_checked;
 261         compat_caddr_t dmabuf;
 262         compat_int_t    bufblocks;
 263 };
 264
 265 struct compat_floppy_fdc_state {
 266         compat_int_t    spec1;
 267         compat_int_t    spec2;
 268         compat_int_t    dtr;
 269         unsigned char   version;
 270         unsigned char   dor;
 271         compat_ulong_t  address;
 272         unsigned int    rawcmd:2;
 273         unsigned int    reset:1;
 274         unsigned int    need_configure:1;
 275         unsigned int    perp_mode:2;
 276         unsigned int    has_fifo:1;
 277         unsigned int    driver_version;
 278         unsigned char   track[4];
 279 };
 280
 281 struct compat_floppy_write_errors {
 282         unsigned int    write_errors;
 283         compat_ulong_t  first_error_sector;
 284         compat_int_t    first_error_generation;
 285         compat_ulong_t  last_error_sector;
 286         compat_int_t    last_error_generation;
 287         compat_uint_t   badness;
 288 };
 289
 290 #define FDSETPRM32 _IOW(2, 0x42, struct compat_floppy_struct)
 291 #define FDDEFPRM32 _IOW(2, 0x43, struct compat_floppy_struct)
 292 #define FDGETPRM32 _IOR(2, 0x04, struct compat_floppy_struct)
 293 #define FDSETDRVPRM32 _IOW(2, 0x90, struct compat_floppy_drive_params)
 294 #define FDGETDRVPRM32 _IOR(2, 0x11, struct compat_floppy_drive_params)
 295 #define FDGETDRVSTAT32 _IOR(2, 0x12, struct compat_floppy_drive_struct)
 296 #define FDPOLLDRVSTAT32 _IOR(2, 0x13, struct compat_floppy_drive_struct)
 297 #define FDGETFDCSTAT32 _IOR(2, 0x15, struct compat_floppy_fdc_state)
 298 #define FDWERRORGET32  _IOR(2, 0x17, struct compat_floppy_write_errors)
 299
 300 static struct {
 301         unsigned int    cmd32;
 302         unsigned int    cmd;
 303 } fd_ioctl_trans_table[] = {
 304         { FDSETPRM32, FDSETPRM },
 305         { FDDEFPRM32, FDDEFPRM },
 306         { FDGETPRM32, FDGETPRM },
 307         { FDSETDRVPRM32, FDSETDRVPRM },
 308         { FDGETDRVPRM32, FDGETDRVPRM },
 309         { FDGETDRVSTAT32, FDGETDRVSTAT },
 310         { FDPOLLDRVSTAT32, FDPOLLDRVSTAT },
 311         { FDGETFDCSTAT32, FDGETFDCSTAT },
 312         { FDWERRORGET32, FDWERRORGET }
 313 };
 314
 315 #define NR_FD_IOCTL_TRANS ARRAY_SIZE(fd_ioctl_trans_table)
 316
 317 static int compat_fd_ioctl(struct block_device *bdev, fmode_t mode,
 318                 unsigned int cmd, unsigned long arg)
 319 {
 320         mm_segment_t old_fs = get_fs();
 321         void *karg = NULL;
 322         unsigned int kcmd = 0;
 323         int i, err;
 324
 325         for (i = 0; i < NR_FD_IOCTL_TRANS; i++)
 326                 if (cmd == fd_ioctl_trans_table[i].cmd32) {
 327                         kcmd = fd_ioctl_trans_table[i].cmd;
 328                         break;
 329                 }
 330         if (!kcmd)
 331                 return -EINVAL;
 332
 333         switch (cmd) {
 334         case FDSETPRM32:
 335         case FDDEFPRM32:
 336         case FDGETPRM32:
 337         {
 338                 compat_uptr_t name;
 339                 struct compat_floppy_struct __user *uf;
 340                 struct floppy_struct *f;
 341
 342                 uf = compat_ptr(arg);
 343                 f = karg = kmalloc(sizeof(struct floppy_struct), GFP_KERNEL);
 344                 if (!karg)
 345                         return -ENOMEM;
 346                 if (cmd == FDGETPRM32)
 347                         break;
 348                 err = __get_user(f->size, &uf->size);
 349                 err |= __get_user(f->sect, &uf->sect);
 350                 err |= __get_user(f->head, &uf->head);
 351                 err |= __get_user(f->track, &uf->track);
 352                 err |= __get_user(f->stretch, &uf->stretch);
 353                 err |= __get_user(f->gap, &uf->gap);
 354                 err |= __get_user(f->rate, &uf->rate);
 355                 err |= __get_user(f->spec1, &uf->spec1);
 356                 err |= __get_user(f->fmt_gap, &uf->fmt_gap);
 357                 err |= __get_user(name, &uf->name);
 358                 f->name = compat_ptr(name);
 359                 if (err) {
 360                         err = -EFAULT;
 361                         goto out;
 362                 }
 363                 break;
 364         }
 365         case FDSETDRVPRM32:
 366         case FDGETDRVPRM32:
 367         {
 368                 struct compat_floppy_drive_params __user *uf;
 369                 struct floppy_drive_params *f;
 370
 371                 uf = compat_ptr(arg);
 372                 f = karg = kmalloc(sizeof(struct floppy_drive_params), GFP_KERNEL);
 373                 if (!karg)
 374                         return -ENOMEM;
 375                 if (cmd == FDGETDRVPRM32)
 376                         break;
 377                 err = __get_user(f->cmos, &uf->cmos);
 378                 err |= __get_user(f->max_dtr, &uf->max_dtr);
 379                 err |= __get_user(f->hlt, &uf->hlt);
 380                 err |= __get_user(f->hut, &uf->hut);
 381                 err |= __get_user(f->srt, &uf->srt);
 382                 err |= __get_user(f->spinup, &uf->spinup);
 383                 err |= __get_user(f->spindown, &uf->spindown);
 384                 err |= __get_user(f->spindown_offset, &uf->spindown_offset);
 385                 err |= __get_user(f->select_delay, &uf->select_delay);
 386                 err |= __get_user(f->rps, &uf->rps);
 387                 err |= __get_user(f->tracks, &uf->tracks);
 388                 err |= __get_user(f->timeout, &uf->timeout);
 389                 err |= __get_user(f->interleave_sect, &uf->interleave_sect);
 390                 err |= __copy_from_user(&f->max_errors, &uf->max_errors, sizeof(f->max_errors));
 391                 err |= __get_user(f->flags, &uf->flags);
 392                 err |= __get_user(f->read_track, &uf->read_track);
 393                 err |= __copy_from_user(f->autodetect, uf->autodetect, sizeof(f->autodetect));
 394                 err |= __get_user(f->checkfreq, &uf->checkfreq);
 395                 err |= __get_user(f->native_format, &uf->native_format);
 396                 if (err) {
 397                         err = -EFAULT;
 398                         goto out;
 399                 }
 400                 break;
 401         }
 402         case FDGETDRVSTAT32:
 403         case FDPOLLDRVSTAT32:
 404                 karg = kmalloc(sizeof(struct floppy_drive_struct), GFP_KERNEL);
 405                 if (!karg)
 406                         return -ENOMEM;
 407                 break;
 408         case FDGETFDCSTAT32:
 409                 karg = kmalloc(sizeof(struct floppy_fdc_state), GFP_KERNEL);
 410                 if (!karg)
 411                         return -ENOMEM;
 412                 break;
 413         case FDWERRORGET32:
 414                 karg = kmalloc(sizeof(struct floppy_write_errors), GFP_KERNEL);
 415                 if (!karg)
 416                         return -ENOMEM;
 417                 break;
 418         default:
 419                 return -EINVAL;
 420         }
 421         set_fs(KERNEL_DS);
 422         err = __blkdev_driver_ioctl(bdev, mode, kcmd, (unsigned long)karg);
 423         set_fs(old_fs);
 424         if (err)
 425                 goto out;
 426         switch (cmd) {
 427         case FDGETPRM32:
 428         {
 429                 struct floppy_struct *f = karg;
 430                 struct compat_floppy_struct __user *uf = compat_ptr(arg);
 431
 432                 err = __put_user(f->size, &uf->size);
 433                 err |= __put_user(f->sect, &uf->sect);
 434                 err |= __put_user(f->head, &uf->head);
 435                 err |= __put_user(f->track, &uf->track);
 436                 err |= __put_user(f->stretch, &uf->stretch);
 437                 err |= __put_user(f->gap, &uf->gap);
 438                 err |= __put_user(f->rate, &uf->rate);
 439                 err |= __put_user(f->spec1, &uf->spec1);
 440                 err |= __put_user(f->fmt_gap, &uf->fmt_gap);
 441                 err |= __put_user((u64)f->name, (compat_caddr_t __user *)&uf->name);
 442                 break;
 443         }
 444         case FDGETDRVPRM32:
 445         {
 446                 struct compat_floppy_drive_params __user *uf;
 447                 struct floppy_drive_params *f = karg;
 448
 449                 uf = compat_ptr(arg);
 450                 err = __put_user(f->cmos, &uf->cmos);
 451                 err |= __put_user(f->max_dtr, &uf->max_dtr);
 452                 err |= __put_user(f->hlt, &uf->hlt);
 453                 err |= __put_user(f->hut, &uf->hut);
 454                 err |= __put_user(f->srt, &uf->srt);
 455                 err |= __put_user(f->spinup, &uf->spinup);
 456                 err |= __put_user(f->spindown, &uf->spindown);
 457                 err |= __put_user(f->spindown_offset, &uf->spindown_offset);
 458                 err |= __put_user(f->select_delay, &uf->select_delay);
 459                 err |= __put_user(f->rps, &uf->rps);
 460                 err |= __put_user(f->tracks, &uf->tracks);
 461                 err |= __put_user(f->timeout, &uf->timeout);
 462                 err |= __put_user(f->interleave_sect, &uf->interleave_sect);
 463                 err |= __copy_to_user(&uf->max_errors, &f->max_errors, sizeof(f->max_errors));
 464                 err |= __put_user(f->flags, &uf->flags);
 465                 err |= __put_user(f->read_track, &uf->read_track);
 466                 err |= __copy_to_user(uf->autodetect, f->autodetect, sizeof(f->autodetect));
 467                 err |= __put_user(f->checkfreq, &uf->checkfreq);
 468                 err |= __put_user(f->native_format, &uf->native_format);
 469                 break;
 470         }
 471         case FDGETDRVSTAT32:
 472         case FDPOLLDRVSTAT32:
 473         {
 474                 struct compat_floppy_drive_struct __user *uf;
 475                 struct floppy_drive_struct *f = karg;
 476
 477                 uf = compat_ptr(arg);
 478                 err = __put_user(f->flags, &uf->flags);
 479                 err |= __put_user(f->spinup_date, &uf->spinup_date);
 480                 err |= __put_user(f->select_date, &uf->select_date);
 481                 err |= __put_user(f->first_read_date, &uf->first_read_date);
 482                 err |= __put_user(f->probed_format, &uf->probed_format);
 483                 err |= __put_user(f->track, &uf->track);
 484                 err |= __put_user(f->maxblock, &uf->maxblock);
 485                 err |= __put_user(f->maxtrack, &uf->maxtrack);
 486                 err |= __put_user(f->generation, &uf->generation);
 487                 err |= __put_user(f->keep_data, &uf->keep_data);
 488                 err |= __put_user(f->fd_ref, &uf->fd_ref);
 489                 err |= __put_user(f->fd_device, &uf->fd_device);
 490                 err |= __put_user(f->last_checked, &uf->last_checked);
 491                 err |= __put_user((u64)f->dmabuf, &uf->dmabuf);
 492                 err |= __put_user((u64)f->bufblocks, &uf->bufblocks);
 493                 break;
 494         }
 495         case FDGETFDCSTAT32:
 496         {
 497                 struct compat_floppy_fdc_state __user *uf;
 498                 struct floppy_fdc_state *f = karg;
 499
 500                 uf = compat_ptr(arg);
 501                 err = __put_user(f->spec1, &uf->spec1);
 502                 err |= __put_user(f->spec2, &uf->spec2);
 503                 err |= __put_user(f->dtr, &uf->dtr);
 504                 err |= __put_user(f->version, &uf->version);
 505                 err |= __put_user(f->dor, &uf->dor);
 506                 err |= __put_user(f->address, &uf->address);
 507                 err |= __copy_to_user((char __user *)&uf->address + sizeof(uf->address),
 508                                    (char *)&f->address + sizeof(f->address), sizeof(int));
 509                 err |= __put_user(f->driver_version, &uf->driver_version);
 510                 err |= __copy_to_user(uf->track, f->track, sizeof(f->track));
 511                 break;
 512         }
 513         case FDWERRORGET32:
 514         {
 515                 struct compat_floppy_write_errors __user *uf;
 516                 struct floppy_write_errors *f = karg;
 517
 518                 uf = compat_ptr(arg);
 519                 err = __put_user(f->write_errors, &uf->write_errors);
 520                 err |= __put_user(f->first_error_sector, &uf->first_error_sector);
 521                 err |= __put_user(f->first_error_generation, &uf->first_error_generation);
 522                 err |= __put_user(f->last_error_sector, &uf->last_error_sector);
 523                 err |= __put_user(f->last_error_generation, &uf->last_error_generation);
 524                 err |= __put_user(f->badness, &uf->badness);
 525                 break;
 526         }
 527         default:
 528                 break;
 529         }
 530         if (err)
 531                 err = -EFAULT;
 532
 533 out:
 534         kfree(karg);
 535         return err;
 536 }
 537
 538 static int compat_blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
 539                         unsigned cmd, unsigned long arg)
 540 {
 541         switch (cmd) {
 542         case HDIO_GET_UNMASKINTR:
 543         case HDIO_GET_MULTCOUNT:
 544         case HDIO_GET_KEEPSETTINGS:
 545         case HDIO_GET_32BIT:
 546         case HDIO_GET_NOWERR:
 547         case HDIO_GET_DMA:
 548         case HDIO_GET_NICE:
 549         case HDIO_GET_WCACHE:
 550         case HDIO_GET_ACOUSTIC:
 551         case HDIO_GET_ADDRESS:
 552         case HDIO_GET_BUSSTATE:
 553                 return compat_hdio_ioctl(bdev, mode, cmd, arg);
 554         case FDSETPRM32:
 555         case FDDEFPRM32:
 556         case FDGETPRM32:
 557         case FDSETDRVPRM32:
 558         case FDGETDRVPRM32:
 559         case FDGETDRVSTAT32:
 560         case FDPOLLDRVSTAT32:
 561         case FDGETFDCSTAT32:
 562         case FDWERRORGET32:
 563                 return compat_fd_ioctl(bdev, mode, cmd, arg);
 564         case CDROMREADAUDIO:
 565                 return compat_cdrom_read_audio(bdev, mode, cmd, arg);
 566         case CDROM_SEND_PACKET:
 567                 return compat_cdrom_generic_command(bdev, mode, cmd, arg);
 568
 569         /*
 570          * No handler required for the ones below, we just need to
 571          * convert arg to a 64 bit pointer.
 572          */
 573         case BLKSECTSET:
 574         /*
 575          * 0x03 -- HD/IDE ioctl's used by hdparm and friends.
 576          *         Some need translations, these do not.
 577          */
 578         case HDIO_GET_IDENTITY:
 579         case HDIO_DRIVE_TASK:
 580         case HDIO_DRIVE_CMD:
 581         /* 0x330 is reserved -- it used to be HDIO_GETGEO_BIG */
 582         case 0x330:
 583         /* 0x02 -- Floppy ioctls */
 584         case FDMSGON:
 585         case FDMSGOFF:
 586         case FDSETEMSGTRESH:
 587         case FDFLUSH:
 588         case FDWERRORCLR:
 589         case FDSETMAXERRS:
 590         case FDGETMAXERRS:
 591         case FDGETDRVTYP:
 592         case FDEJECT:
 593         case FDCLRPRM:
 594         case FDFMTBEG:
 595         case FDFMTEND:
 596         case FDRESET:
 597         case FDTWADDLE:
 598         case FDFMTTRK:
 599         case FDRAWCMD:
 600         /* CDROM stuff */
 601         case CDROMPAUSE:
 602         case CDROMRESUME:
 603         case CDROMPLAYMSF:
 604         case CDROMPLAYTRKIND:
 605         case CDROMREADTOCHDR:
 606         case CDROMREADTOCENTRY:
 607         case CDROMSTOP:
 608         case CDROMSTART:
 609         case CDROMEJECT:
 610         case CDROMVOLCTRL:
 611         case CDROMSUBCHNL:
 612         case CDROMMULTISESSION:
 613         case CDROM_GET_MCN:
 614         case CDROMRESET:
 615         case CDROMVOLREAD:
 616         case CDROMSEEK:
 617         case CDROMPLAYBLK:
 618         case CDROMCLOSETRAY:
 619         case CDROM_DISC_STATUS:
 620         case CDROM_CHANGER_NSLOTS:
 621         case CDROM_GET_CAPABILITY:
 622         /* Ignore cdrom.h about these next 5 ioctls, they absolutely do
 623          * not take a struct cdrom_read, instead they take a struct cdrom_msf
 624          * which is compatible.
 625          */
 626         case CDROMREADMODE2:
 627         case CDROMREADMODE1:
 628         case CDROMREADRAW:
 629         case CDROMREADCOOKED:
 630         case CDROMREADALL:
 631         /* DVD ioctls */
 632         case DVD_READ_STRUCT:
 633         case DVD_WRITE_STRUCT:
 634         case DVD_AUTH:
 635                 arg = (unsigned long)compat_ptr(arg);
 636         /* These intepret arg as an unsigned long, not as a pointer,
 637          * so we must not do compat_ptr() conversion. */
 638         case HDIO_SET_MULTCOUNT:
 639         case HDIO_SET_UNMASKINTR:
 640         case HDIO_SET_KEEPSETTINGS:
 641         case HDIO_SET_32BIT:
 642         case HDIO_SET_NOWERR:
 643         case HDIO_SET_DMA:
 644         case HDIO_SET_PIO_MODE:
 645         case HDIO_SET_NICE:
 646         case HDIO_SET_WCACHE:
 647         case HDIO_SET_ACOUSTIC:
 648         case HDIO_SET_BUSSTATE:
 649         case HDIO_SET_ADDRESS:
 650         case CDROMEJECT_SW:
 651         case CDROM_SET_OPTIONS:
 652         case CDROM_CLEAR_OPTIONS:
 653         case CDROM_SELECT_SPEED:
 654         case CDROM_SELECT_DISC:
 655         case CDROM_MEDIA_CHANGED:
 656         case CDROM_DRIVE_STATUS:
 657         case CDROM_LOCKDOOR:
 658         case CDROM_DEBUG:
 659                 break;
 660         default:
 661                 /* unknown ioctl number */
 662                 return -ENOIOCTLCMD;
 663         }
 664
 665         return __blkdev_driver_ioctl(bdev, mode, cmd, arg);
 666 }
 667
 668 /* Most of the generic ioctls are handled in the normal fallback path.
 669    This assumes the blkdev's low level compat_ioctl always returns
 670    ENOIOCTLCMD for unknown ioctls. */
 671 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 672 {
 673         int ret = -ENOIOCTLCMD;
 674         struct inode *inode = file->f_mapping->host;
 675         struct block_device *bdev = inode->i_bdev;
 676         struct gendisk *disk = bdev->bd_disk;
 677         fmode_t mode = file->f_mode;
 678         struct backing_dev_info *bdi;
 679         loff_t size;
 680
 681         /*
 682          * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
 683          * to updated it before every ioctl.
 684          */
 685         if (file->f_flags & O_NDELAY)
 686                 mode |= FMODE_NDELAY;
 687         else
 688                 mode &= ~FMODE_NDELAY;
 689
 690         switch (cmd) {
 691         case HDIO_GETGEO:
 692                 return compat_hdio_getgeo(disk, bdev, compat_ptr(arg));
 693         case BLKPBSZGET:
 694                 return compat_put_uint(arg, bdev_physical_block_size(bdev));
 695         case BLKIOMIN:
 696                 return compat_put_uint(arg, bdev_io_min(bdev));
 697         case BLKIOOPT:
 698                 return compat_put_uint(arg, bdev_io_opt(bdev));
 699         case BLKALIGNOFF:
 700                 return compat_put_int(arg, bdev_alignment_offset(bdev));
 701         case BLKDISCARDZEROES:
 702                 return compat_put_uint(arg, bdev_discard_zeroes_data(bdev));
 703         case BLKFLSBUF:
 704         case BLKROSET:
 705         case BLKDISCARD:
 706         case BLKSECDISCARD:
 707         /*
 708          * the ones below are implemented in blkdev_locked_ioctl,
 709          * but we call blkdev_ioctl, which gets the lock for us
 710          */
 711         case BLKRRPART:
 712                 return blkdev_ioctl(bdev, mode, cmd,
 713                                 (unsigned long)compat_ptr(arg));
 714         case BLKBSZSET_32:
 715                 return blkdev_ioctl(bdev, mode, BLKBSZSET,
 716                                 (unsigned long)compat_ptr(arg));
 717         case BLKPG:
 718                 return compat_blkpg_ioctl(bdev, mode, cmd, compat_ptr(arg));
 719         case BLKRAGET:
 720         case BLKFRAGET:
 721                 if (!arg)
 722                         return -EINVAL;
 723                 bdi = blk_get_backing_dev_info(bdev);
 724                 if (bdi == NULL)
 725                         return -ENOTTY;
 726                 return compat_put_long(arg,
 727                                        (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
 728         case BLKROGET: /* compatible */
 729                 return compat_put_int(arg, bdev_read_only(bdev) != 0);
 730         case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
 731                 return compat_put_int(arg, block_size(bdev));
 732         case BLKSSZGET: /* get block device hardware sector size */
 733                 return compat_put_int(arg, bdev_logical_block_size(bdev));
 734         case BLKSECTGET:
 735                 return compat_put_ushort(arg,
 736                                          queue_max_sectors(bdev_get_queue(bdev)));
 737         case BLKRASET: /* compatible, but no compat_ptr (!) */
 738         case BLKFRASET:
 739                 if (!capable(CAP_SYS_ADMIN))
 740                         return -EACCES;
 741                 bdi = blk_get_backing_dev_info(bdev);
 742                 if (bdi == NULL)
 743                         return -ENOTTY;
 744                 bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
 745                 return 0;
 746         case BLKGETSIZE:
 747                 size = bdev->bd_inode->i_size;
 748                 if ((size >> 9) > ~0UL)
 749                         return -EFBIG;
 750                 return compat_put_ulong(arg, size >> 9);
 751
 752         case BLKGETSIZE64_32:
 753                 return compat_put_u64(arg, bdev->bd_inode->i_size);
 754
 755         case BLKTRACESETUP32:
 756         case BLKTRACESTART: /* compatible */
 757         case BLKTRACESTOP:  /* compatible */
 758         case BLKTRACETEARDOWN: /* compatible */
 759                 ret = blk_trace_ioctl(bdev, cmd, compat_ptr(arg));
 760                 return ret;
 761         default:
 762                 if (disk->fops->compat_ioctl)
 763                         ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
 764                 if (ret == -ENOIOCTLCMD)
 765                         ret = compat_blkdev_driver_ioctl(bdev, mode, cmd, arg);
 766                 return ret;
 767         }
 768 }