block/compat_ioctl.c

   1 #include <linux/blkdev.h>
   2 #include <linux/blkpg.h>
   3 #include <linux/blktrace_api.h>
   4 #include <linux/cdrom.h>
   5 #include <linux/compat.h>
   6 #include <linux/elevator.h>
   7 #include <linux/fd.h>
   8 #include <linux/hdreg.h>
   9 #include <linux/slab.h>
  10 #include <linux/syscalls.h>
  11 #include <linux/types.h>
  12 #include <linux/uaccess.h>
  13
  14 static int compat_put_ushort(unsigned long arg, unsigned short val)
  15 {
  16         return put_user(val, (unsigned short __user *)compat_ptr(arg));
  17 }
  18
  19 static int compat_put_int(unsigned long arg, int val)
  20 {
  21         return put_user(val, (compat_int_t __user *)compat_ptr(arg));
  22 }
  23
  24 static int compat_put_uint(unsigned long arg, unsigned int val)
  25 {
  26         return put_user(val, (compat_uint_t __user *)compat_ptr(arg));
  27 }
  28
  29 static int compat_put_long(unsigned long arg, long val)
  30 {
  31         return put_user(val, (compat_long_t __user *)compat_ptr(arg));
  32 }
  33
  34 static int compat_put_ulong(unsigned long arg, compat_ulong_t val)
  35 {
  36         return put_user(val, (compat_ulong_t __user *)compat_ptr(arg));
  37 }
  38
  39 static int compat_put_u64(unsigned long arg, u64 val)
  40 {
  41         return put_user(val, (compat_u64 __user *)compat_ptr(arg));
  42 }
  43
  44 struct compat_hd_geometry {
  45         unsigned char heads;
  46         unsigned char sectors;
  47         unsigned short cylinders;
  48         u32 start;
  49 };
  50
  51 static int compat_hdio_getgeo(struct gendisk *disk, struct block_device *bdev,
  52                         struct compat_hd_geometry __user *ugeo)
  53 {
  54         struct hd_geometry geo;
  55         int ret;
  56
  57         if (!ugeo)
  58                 return -EINVAL;
  59         if (!disk->fops->getgeo)
  60                 return -ENOTTY;
  61
  62         memset(&geo, 0, sizeof(geo));
  63         /*
  64          * We need to set the startsect first, the driver may
  65          * want to override it.
  66          */
  67         geo.start = get_start_sect(bdev);
  68         ret = disk->fops->getgeo(bdev, &geo);
  69         if (ret)
  70                 return ret;
  71
  72         ret = copy_to_user(ugeo, &geo, 4);
  73         ret |= put_user(geo.start, &ugeo->start);
  74         if (ret)
  75                 ret = -EFAULT;
  76
  77         return ret;
  78 }
  79
  80 static int compat_hdio_ioctl(struct block_device *bdev, fmode_t mode,
  81                 unsigned int cmd, unsigned long arg)
  82 {
  83         mm_segment_t old_fs = get_fs();
  84         unsigned long kval;
  85         unsigned int __user *uvp;
  86         int error;
  87
  88         set_fs(KERNEL_DS);
  89         error = __blkdev_driver_ioctl(bdev, mode,
  90                                 cmd, (unsigned long)(&kval));
  91         set_fs(old_fs);
  92
  93         if (error == 0) {
  94                 uvp = compat_ptr(arg);
  95                 if (put_user(kval, uvp))
  96                         error = -EFAULT;
  97         }
  98         return error;
  99 }
 100
 101 struct compat_cdrom_read_audio {
 102         union cdrom_addr        addr;
 103         u8                      addr_format;
 104         compat_int_t            nframes;
 105         compat_caddr_t          buf;
 106 };
 107
 108 struct compat_cdrom_generic_command {
 109         unsigned char   cmd[CDROM_PACKET_SIZE];
 110         compat_caddr_t  buffer;
 111         compat_uint_t   buflen;
 112         compat_int_t    stat;
 113         compat_caddr_t  sense;
 114         unsigned char   data_direction;
 115         compat_int_t    quiet;
 116         compat_int_t    timeout;
 117         compat_caddr_t  reserved[1];
 118 };
 119
 120 static int compat_cdrom_read_audio(struct block_device *bdev, fmode_t mode,
 121                 unsigned int cmd, unsigned long arg)
 122 {
 123         struct cdrom_read_audio __user *cdread_audio;
 124         struct compat_cdrom_read_audio __user *cdread_audio32;
 125         __u32 data;
 126         void __user *datap;
 127
 128         cdread_audio = compat_alloc_user_space(sizeof(*cdread_audio));
 129         cdread_audio32 = compat_ptr(arg);
 130
 131         if (copy_in_user(&cdread_audio->addr,
 132                          &cdread_audio32->addr,
 133                          (sizeof(*cdread_audio32) -
 134                           sizeof(compat_caddr_t))))
 135                 return -EFAULT;
 136
 137         if (get_user(data, &cdread_audio32->buf))
 138                 return -EFAULT;
 139         datap = compat_ptr(data);
 140         if (put_user(datap, &cdread_audio->buf))
 141                 return -EFAULT;
 142
 143         return __blkdev_driver_ioctl(bdev, mode, cmd,
 144                         (unsigned long)cdread_audio);
 145 }
 146
 147 static int compat_cdrom_generic_command(struct block_device *bdev, fmode_t mode,
 148                 unsigned int cmd, unsigned long arg)
 149 {
 150         struct cdrom_generic_command __user *cgc;
 151         struct compat_cdrom_generic_command __user *cgc32;
 152         u32 data;
 153         unsigned char dir;
 154         int itmp;
 155
 156         cgc = compat_alloc_user_space(sizeof(*cgc));
 157         cgc32 = compat_ptr(arg);
 158
 159         if (copy_in_user(&cgc->cmd, &cgc32->cmd, sizeof(cgc->cmd)) ||
 160             get_user(data, &cgc32->buffer) ||
 161             put_user(compat_ptr(data), &cgc->buffer) ||
 162             copy_in_user(&cgc->buflen, &cgc32->buflen,
 163                          (sizeof(unsigned int) + sizeof(int))) ||
 164             get_user(data, &cgc32->sense) ||
 165             put_user(compat_ptr(data), &cgc->sense) ||
 166             get_user(dir, &cgc32->data_direction) ||
 167             put_user(dir, &cgc->data_direction) ||
 168             get_user(itmp, &cgc32->quiet) ||
 169             put_user(itmp, &cgc->quiet) ||
 170             get_user(itmp, &cgc32->timeout) ||
 171             put_user(itmp, &cgc->timeout) ||
 172             get_user(data, &cgc32->reserved[0]) ||
 173             put_user(compat_ptr(data), &cgc->reserved[0]))
 174                 return -EFAULT;
 175
 176         return __blkdev_driver_ioctl(bdev, mode, cmd, (unsigned long)cgc);
 177 }
 178
 179 struct compat_blkpg_ioctl_arg {
 180         compat_int_t op;
 181         compat_int_t flags;
 182         compat_int_t datalen;
 183         compat_caddr_t data;
 184 };
 185
 186 static int compat_blkpg_ioctl(struct block_device *bdev, fmode_t mode,
 187                 unsigned int cmd, struct compat_blkpg_ioctl_arg __user *ua32)
 188 {
 189         struct blkpg_ioctl_arg __user *a = compat_alloc_user_space(sizeof(*a));
 190         compat_caddr_t udata;
 191         compat_int_t n;
 192         int err;
 193
 194         err = get_user(n, &ua32->op);
 195         err |= put_user(n, &a->op);
 196         err |= get_user(n, &ua32->flags);
 197         err |= put_user(n, &a->flags);
 198         err |= get_user(n, &ua32->datalen);
 199         err |= put_user(n, &a->datalen);
 200         err |= get_user(udata, &ua32->data);
 201         err |= put_user(compat_ptr(udata), &a->data);
 202         if (err)
 203                 return err;
 204
 205         return blkdev_ioctl(bdev, mode, cmd, (unsigned long)a);
 206 }
 207
 208 #define BLKBSZGET_32            _IOR(0x12, 112, int)
 209 #define BLKBSZSET_32            _IOW(0x12, 113, int)
 210 #define BLKGETSIZE64_32         _IOR(0x12, 114, int)
 211
 212 struct compat_floppy_drive_params {
 213         char            cmos;
 214         compat_ulong_t  max_dtr;
 215         compat_ulong_t  hlt;
 216         compat_ulong_t  hut;
 217         compat_ulong_t  srt;
 218         compat_ulong_t  spinup;
 219         compat_ulong_t  spindown;
 220         unsigned char   spindown_offset;
 221         unsigned char   select_delay;
 222         unsigned char   rps;
 223         unsigned char   tracks;
 224         compat_ulong_t  timeout;
 225         unsigned char   interleave_sect;
 226         struct floppy_max_errors max_errors;
 227         char            flags;
 228         char            read_track;
 229         short           autodetect[8];
 230         compat_int_t    checkfreq;
 231         compat_int_t    native_format;
 232 };
 233
 234 struct compat_floppy_drive_struct {
 235         signed char     flags;
 236         compat_ulong_t  spinup_date;
 237         compat_ulong_t  select_date;
 238         compat_ulong_t  first_read_date;
 239         short           probed_format;
 240         short           track;
 241         short           maxblock;
 242         short           maxtrack;
 243         compat_int_t    generation;
 244         compat_int_t    keep_data;
 245         compat_int_t    fd_ref;
 246         compat_int_t    fd_device;
 247         compat_int_t    last_checked;
 248         compat_caddr_t dmabuf;
 249         compat_int_t    bufblocks;
 250 };
 251
 252 struct compat_floppy_fdc_state {
 253         compat_int_t    spec1;
 254         compat_int_t    spec2;
 255         compat_int_t    dtr;
 256         unsigned char   version;
 257         unsigned char   dor;
 258         compat_ulong_t  address;
 259         unsigned int    rawcmd:2;
 260         unsigned int    reset:1;
 261         unsigned int    need_configure:1;
 262         unsigned int    perp_mode:2;
 263         unsigned int    has_fifo:1;
 264         unsigned int    driver_version;
 265         unsigned char   track[4];
 266 };
 267
 268 struct compat_floppy_write_errors {
 269         unsigned int    write_errors;
 270         compat_ulong_t  first_error_sector;
 271         compat_int_t    first_error_generation;
 272         compat_ulong_t  last_error_sector;
 273         compat_int_t    last_error_generation;
 274         compat_uint_t   badness;
 275 };
 276
 277 #define FDSETPRM32 _IOW(2, 0x42, struct compat_floppy_struct)
 278 #define FDDEFPRM32 _IOW(2, 0x43, struct compat_floppy_struct)
 279 #define FDSETDRVPRM32 _IOW(2, 0x90, struct compat_floppy_drive_params)
 280 #define FDGETDRVPRM32 _IOR(2, 0x11, struct compat_floppy_drive_params)
 281 #define FDGETDRVSTAT32 _IOR(2, 0x12, struct compat_floppy_drive_struct)
 282 #define FDPOLLDRVSTAT32 _IOR(2, 0x13, struct compat_floppy_drive_struct)
 283 #define FDGETFDCSTAT32 _IOR(2, 0x15, struct compat_floppy_fdc_state)
 284 #define FDWERRORGET32  _IOR(2, 0x17, struct compat_floppy_write_errors)
 285
 286 static struct {
 287         unsigned int    cmd32;
 288         unsigned int    cmd;
 289 } fd_ioctl_trans_table[] = {
 290         { FDSETPRM32, FDSETPRM },
 291         { FDDEFPRM32, FDDEFPRM },
 292         { FDGETPRM32, FDGETPRM },
 293         { FDSETDRVPRM32, FDSETDRVPRM },
 294         { FDGETDRVPRM32, FDGETDRVPRM },
 295         { FDGETDRVSTAT32, FDGETDRVSTAT },
 296         { FDPOLLDRVSTAT32, FDPOLLDRVSTAT },
 297         { FDGETFDCSTAT32, FDGETFDCSTAT },
 298         { FDWERRORGET32, FDWERRORGET }
 299 };
 300
 301 #define NR_FD_IOCTL_TRANS ARRAY_SIZE(fd_ioctl_trans_table)
 302
 303 static int compat_fd_ioctl(struct block_device *bdev, fmode_t mode,
 304                 unsigned int cmd, unsigned long arg)
 305 {
 306         mm_segment_t old_fs = get_fs();
 307         void *karg = NULL;
 308         unsigned int kcmd = 0;
 309         int i, err;
 310
 311         for (i = 0; i < NR_FD_IOCTL_TRANS; i++)
 312                 if (cmd == fd_ioctl_trans_table[i].cmd32) {
 313                         kcmd = fd_ioctl_trans_table[i].cmd;
 314                         break;
 315                 }
 316         if (!kcmd)
 317                 return -EINVAL;
 318
 319         switch (cmd) {
 320         case FDSETPRM32:
 321         case FDDEFPRM32:
 322         case FDGETPRM32:
 323         {
 324                 compat_uptr_t name;
 325                 struct compat_floppy_struct __user *uf;
 326                 struct floppy_struct *f;
 327
 328                 uf = compat_ptr(arg);
 329                 f = karg = kmalloc(sizeof(struct floppy_struct), GFP_KERNEL);
 330                 if (!karg)
 331                         return -ENOMEM;
 332                 if (cmd == FDGETPRM32)
 333                         break;
 334                 err = __get_user(f->size, &uf->size);
 335                 err |= __get_user(f->sect, &uf->sect);
 336                 err |= __get_user(f->head, &uf->head);
 337                 err |= __get_user(f->track, &uf->track);
 338                 err |= __get_user(f->stretch, &uf->stretch);
 339                 err |= __get_user(f->gap, &uf->gap);
 340                 err |= __get_user(f->rate, &uf->rate);
 341                 err |= __get_user(f->spec1, &uf->spec1);
 342                 err |= __get_user(f->fmt_gap, &uf->fmt_gap);
 343                 err |= __get_user(name, &uf->name);
 344                 f->name = compat_ptr(name);
 345                 if (err) {
 346                         err = -EFAULT;
 347                         goto out;
 348                 }
 349                 break;
 350         }
 351         case FDSETDRVPRM32:
 352         case FDGETDRVPRM32:
 353         {
 354                 struct compat_floppy_drive_params __user *uf;
 355                 struct floppy_drive_params *f;
 356
 357                 uf = compat_ptr(arg);
 358                 f = karg = kmalloc(sizeof(struct floppy_drive_params), GFP_KERNEL);
 359                 if (!karg)
 360                         return -ENOMEM;
 361                 if (cmd == FDGETDRVPRM32)
 362                         break;
 363                 err = __get_user(f->cmos, &uf->cmos);
 364                 err |= __get_user(f->max_dtr, &uf->max_dtr);
 365                 err |= __get_user(f->hlt, &uf->hlt);
 366                 err |= __get_user(f->hut, &uf->hut);
 367                 err |= __get_user(f->srt, &uf->srt);
 368                 err |= __get_user(f->spinup, &uf->spinup);
 369                 err |= __get_user(f->spindown, &uf->spindown);
 370                 err |= __get_user(f->spindown_offset, &uf->spindown_offset);
 371                 err |= __get_user(f->select_delay, &uf->select_delay);
 372                 err |= __get_user(f->rps, &uf->rps);
 373                 err |= __get_user(f->tracks, &uf->tracks);
 374                 err |= __get_user(f->timeout, &uf->timeout);
 375                 err |= __get_user(f->interleave_sect, &uf->interleave_sect);
 376                 err |= __copy_from_user(&f->max_errors, &uf->max_errors, sizeof(f->max_errors));
 377                 err |= __get_user(f->flags, &uf->flags);
 378                 err |= __get_user(f->read_track, &uf->read_track);
 379                 err |= __copy_from_user(f->autodetect, uf->autodetect, sizeof(f->autodetect));
 380                 err |= __get_user(f->checkfreq, &uf->checkfreq);
 381                 err |= __get_user(f->native_format, &uf->native_format);
 382                 if (err) {
 383                         err = -EFAULT;
 384                         goto out;
 385                 }
 386                 break;
 387         }
 388         case FDGETDRVSTAT32:
 389         case FDPOLLDRVSTAT32:
 390                 karg = kmalloc(sizeof(struct floppy_drive_struct), GFP_KERNEL);
 391                 if (!karg)
 392                         return -ENOMEM;
 393                 break;
 394         case FDGETFDCSTAT32:
 395                 karg = kmalloc(sizeof(struct floppy_fdc_state), GFP_KERNEL);
 396                 if (!karg)
 397                         return -ENOMEM;
 398                 break;
 399         case FDWERRORGET32:
 400                 karg = kmalloc(sizeof(struct floppy_write_errors), GFP_KERNEL);
 401                 if (!karg)
 402                         return -ENOMEM;
 403                 break;
 404         default:
 405                 return -EINVAL;
 406         }
 407         set_fs(KERNEL_DS);
 408         err = __blkdev_driver_ioctl(bdev, mode, kcmd, (unsigned long)karg);
 409         set_fs(old_fs);
 410         if (err)
 411                 goto out;
 412         switch (cmd) {
 413         case FDGETPRM32:
 414         {
 415                 struct floppy_struct *f = karg;
 416                 struct compat_floppy_struct __user *uf = compat_ptr(arg);
 417
 418                 err = __put_user(f->size, &uf->size);
 419                 err |= __put_user(f->sect, &uf->sect);
 420                 err |= __put_user(f->head, &uf->head);
 421                 err |= __put_user(f->track, &uf->track);
 422                 err |= __put_user(f->stretch, &uf->stretch);
 423                 err |= __put_user(f->gap, &uf->gap);
 424                 err |= __put_user(f->rate, &uf->rate);
 425                 err |= __put_user(f->spec1, &uf->spec1);
 426                 err |= __put_user(f->fmt_gap, &uf->fmt_gap);
 427                 err |= __put_user((u64)f->name, (compat_caddr_t __user *)&uf->name);
 428                 break;
 429         }
 430         case FDGETDRVPRM32:
 431         {
 432                 struct compat_floppy_drive_params __user *uf;
 433                 struct floppy_drive_params *f = karg;
 434
 435                 uf = compat_ptr(arg);
 436                 err = __put_user(f->cmos, &uf->cmos);
 437                 err |= __put_user(f->max_dtr, &uf->max_dtr);
 438                 err |= __put_user(f->hlt, &uf->hlt);
 439                 err |= __put_user(f->hut, &uf->hut);
 440                 err |= __put_user(f->srt, &uf->srt);
 441                 err |= __put_user(f->spinup, &uf->spinup);
 442                 err |= __put_user(f->spindown, &uf->spindown);
 443                 err |= __put_user(f->spindown_offset, &uf->spindown_offset);
 444                 err |= __put_user(f->select_delay, &uf->select_delay);
 445                 err |= __put_user(f->rps, &uf->rps);
 446                 err |= __put_user(f->tracks, &uf->tracks);
 447                 err |= __put_user(f->timeout, &uf->timeout);
 448                 err |= __put_user(f->interleave_sect, &uf->interleave_sect);
 449                 err |= __copy_to_user(&uf->max_errors, &f->max_errors, sizeof(f->max_errors));
 450                 err |= __put_user(f->flags, &uf->flags);
 451                 err |= __put_user(f->read_track, &uf->read_track);
 452                 err |= __copy_to_user(uf->autodetect, f->autodetect, sizeof(f->autodetect));
 453                 err |= __put_user(f->checkfreq, &uf->checkfreq);
 454                 err |= __put_user(f->native_format, &uf->native_format);
 455                 break;
 456         }
 457         case FDGETDRVSTAT32:
 458         case FDPOLLDRVSTAT32:
 459         {
 460                 struct compat_floppy_drive_struct __user *uf;
 461                 struct floppy_drive_struct *f = karg;
 462
 463                 uf = compat_ptr(arg);
 464                 err = __put_user(f->flags, &uf->flags);
 465                 err |= __put_user(f->spinup_date, &uf->spinup_date);
 466                 err |= __put_user(f->select_date, &uf->select_date);
 467                 err |= __put_user(f->first_read_date, &uf->first_read_date);
 468                 err |= __put_user(f->probed_format, &uf->probed_format);
 469                 err |= __put_user(f->track, &uf->track);
 470                 err |= __put_user(f->maxblock, &uf->maxblock);
 471                 err |= __put_user(f->maxtrack, &uf->maxtrack);
 472                 err |= __put_user(f->generation, &uf->generation);
 473                 err |= __put_user(f->keep_data, &uf->keep_data);
 474                 err |= __put_user(f->fd_ref, &uf->fd_ref);
 475                 err |= __put_user(f->fd_device, &uf->fd_device);
 476                 err |= __put_user(f->last_checked, &uf->last_checked);
 477                 err |= __put_user((u64)f->dmabuf, &uf->dmabuf);
 478                 err |= __put_user((u64)f->bufblocks, &uf->bufblocks);
 479                 break;
 480         }
 481         case FDGETFDCSTAT32:
 482         {
 483                 struct compat_floppy_fdc_state __user *uf;
 484                 struct floppy_fdc_state *f = karg;
 485
 486                 uf = compat_ptr(arg);
 487                 err = __put_user(f->spec1, &uf->spec1);
 488                 err |= __put_user(f->spec2, &uf->spec2);
 489                 err |= __put_user(f->dtr, &uf->dtr);
 490                 err |= __put_user(f->version, &uf->version);
 491                 err |= __put_user(f->dor, &uf->dor);
 492                 err |= __put_user(f->address, &uf->address);
 493                 err |= __copy_to_user((char __user *)&uf->address + sizeof(uf->address),
 494                                    (char *)&f->address + sizeof(f->address), sizeof(int));
 495                 err |= __put_user(f->driver_version, &uf->driver_version);
 496                 err |= __copy_to_user(uf->track, f->track, sizeof(f->track));
 497                 break;
 498         }
 499         case FDWERRORGET32:
 500         {
 501                 struct compat_floppy_write_errors __user *uf;
 502                 struct floppy_write_errors *f = karg;
 503
 504                 uf = compat_ptr(arg);
 505                 err = __put_user(f->write_errors, &uf->write_errors);
 506                 err |= __put_user(f->first_error_sector, &uf->first_error_sector);
 507                 err |= __put_user(f->first_error_generation, &uf->first_error_generation);
 508                 err |= __put_user(f->last_error_sector, &uf->last_error_sector);
 509                 err |= __put_user(f->last_error_generation, &uf->last_error_generation);
 510                 err |= __put_user(f->badness, &uf->badness);
 511                 break;
 512         }
 513         default:
 514                 break;
 515         }
 516         if (err)
 517                 err = -EFAULT;
 518
 519 out:
 520         kfree(karg);
 521         return err;
 522 }
 523
 524 static int compat_blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
 525                         unsigned cmd, unsigned long arg)
 526 {
 527         switch (cmd) {
 528         case HDIO_GET_UNMASKINTR:
 529         case HDIO_GET_MULTCOUNT:
 530         case HDIO_GET_KEEPSETTINGS:
 531         case HDIO_GET_32BIT:
 532         case HDIO_GET_NOWERR:
 533         case HDIO_GET_DMA:
 534         case HDIO_GET_NICE:
 535         case HDIO_GET_WCACHE:
 536         case HDIO_GET_ACOUSTIC:
 537         case HDIO_GET_ADDRESS:
 538         case HDIO_GET_BUSSTATE:
 539                 return compat_hdio_ioctl(bdev, mode, cmd, arg);
 540         case FDSETPRM32:
 541         case FDDEFPRM32:
 542         case FDGETPRM32:
 543         case FDSETDRVPRM32:
 544         case FDGETDRVPRM32:
 545         case FDGETDRVSTAT32:
 546         case FDPOLLDRVSTAT32:
 547         case FDGETFDCSTAT32:
 548         case FDWERRORGET32:
 549                 return compat_fd_ioctl(bdev, mode, cmd, arg);
 550         case CDROMREADAUDIO:
 551                 return compat_cdrom_read_audio(bdev, mode, cmd, arg);
 552         case CDROM_SEND_PACKET:
 553                 return compat_cdrom_generic_command(bdev, mode, cmd, arg);
 554
 555         /*
 556          * No handler required for the ones below, we just need to
 557          * convert arg to a 64 bit pointer.
 558          */
 559         case BLKSECTSET:
 560         /*
 561          * 0x03 -- HD/IDE ioctl's used by hdparm and friends.
 562          *         Some need translations, these do not.
 563          */
 564         case HDIO_GET_IDENTITY:
 565         case HDIO_DRIVE_TASK:
 566         case HDIO_DRIVE_CMD:
 567         /* 0x330 is reserved -- it used to be HDIO_GETGEO_BIG */
 568         case 0x330:
 569         /* 0x02 -- Floppy ioctls */
 570         case FDMSGON:
 571         case FDMSGOFF:
 572         case FDSETEMSGTRESH:
 573         case FDFLUSH:
 574         case FDWERRORCLR:
 575         case FDSETMAXERRS:
 576         case FDGETMAXERRS:
 577         case FDGETDRVTYP:
 578         case FDEJECT:
 579         case FDCLRPRM:
 580         case FDFMTBEG:
 581         case FDFMTEND:
 582         case FDRESET:
 583         case FDTWADDLE:
 584         case FDFMTTRK:
 585         case FDRAWCMD:
 586         /* CDROM stuff */
 587         case CDROMPAUSE:
 588         case CDROMRESUME:
 589         case CDROMPLAYMSF:
 590         case CDROMPLAYTRKIND:
 591         case CDROMREADTOCHDR:
 592         case CDROMREADTOCENTRY:
 593         case CDROMSTOP:
 594         case CDROMSTART:
 595         case CDROMEJECT:
 596         case CDROMVOLCTRL:
 597         case CDROMSUBCHNL:
 598         case CDROMMULTISESSION:
 599         case CDROM_GET_MCN:
 600         case CDROMRESET:
 601         case CDROMVOLREAD:
 602         case CDROMSEEK:
 603         case CDROMPLAYBLK:
 604         case CDROMCLOSETRAY:
 605         case CDROM_DISC_STATUS:
 606         case CDROM_CHANGER_NSLOTS:
 607         case CDROM_GET_CAPABILITY:
 608         /* Ignore cdrom.h about these next 5 ioctls, they absolutely do
 609          * not take a struct cdrom_read, instead they take a struct cdrom_msf
 610          * which is compatible.
 611          */
 612         case CDROMREADMODE2:
 613         case CDROMREADMODE1:
 614         case CDROMREADRAW:
 615         case CDROMREADCOOKED:
 616         case CDROMREADALL:
 617         /* DVD ioctls */
 618         case DVD_READ_STRUCT:
 619         case DVD_WRITE_STRUCT:
 620         case DVD_AUTH:
 621                 arg = (unsigned long)compat_ptr(arg);
 622         /* These intepret arg as an unsigned long, not as a pointer,
 623          * so we must not do compat_ptr() conversion. */
 624         case HDIO_SET_MULTCOUNT:
 625         case HDIO_SET_UNMASKINTR:
 626         case HDIO_SET_KEEPSETTINGS:
 627         case HDIO_SET_32BIT:
 628         case HDIO_SET_NOWERR:
 629         case HDIO_SET_DMA:
 630         case HDIO_SET_PIO_MODE:
 631         case HDIO_SET_NICE:
 632         case HDIO_SET_WCACHE:
 633         case HDIO_SET_ACOUSTIC:
 634         case HDIO_SET_BUSSTATE:
 635         case HDIO_SET_ADDRESS:
 636         case CDROMEJECT_SW:
 637         case CDROM_SET_OPTIONS:
 638         case CDROM_CLEAR_OPTIONS:
 639         case CDROM_SELECT_SPEED:
 640         case CDROM_SELECT_DISC:
 641         case CDROM_MEDIA_CHANGED:
 642         case CDROM_DRIVE_STATUS:
 643         case CDROM_LOCKDOOR:
 644         case CDROM_DEBUG:
 645                 break;
 646         default:
 647                 /* unknown ioctl number */
 648                 return -ENOIOCTLCMD;
 649         }
 650
 651         return __blkdev_driver_ioctl(bdev, mode, cmd, arg);
 652 }
 653
 654 /* Most of the generic ioctls are handled in the normal fallback path.
 655    This assumes the blkdev's low level compat_ioctl always returns
 656    ENOIOCTLCMD for unknown ioctls. */
 657 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 658 {
 659         int ret = -ENOIOCTLCMD;
 660         struct inode *inode = file->f_mapping->host;
 661         struct block_device *bdev = inode->i_bdev;
 662         struct gendisk *disk = bdev->bd_disk;
 663         fmode_t mode = file->f_mode;
 664         struct backing_dev_info *bdi;
 665         loff_t size;
 666         unsigned int max_sectors;
 667
 668         /*
 669          * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
 670          * to updated it before every ioctl.
 671          */
 672         if (file->f_flags & O_NDELAY)
 673                 mode |= FMODE_NDELAY;
 674         else
 675                 mode &= ~FMODE_NDELAY;
 676
 677         switch (cmd) {
 678         case HDIO_GETGEO:
 679                 return compat_hdio_getgeo(disk, bdev, compat_ptr(arg));
 680         case BLKPBSZGET:
 681                 return compat_put_uint(arg, bdev_physical_block_size(bdev));
 682         case BLKIOMIN:
 683                 return compat_put_uint(arg, bdev_io_min(bdev));
 684         case BLKIOOPT:
 685                 return compat_put_uint(arg, bdev_io_opt(bdev));
 686         case BLKALIGNOFF:
 687                 return compat_put_int(arg, bdev_alignment_offset(bdev));
 688         case BLKDISCARDZEROES:
 689                 return compat_put_uint(arg, bdev_discard_zeroes_data(bdev));
 690         case BLKFLSBUF:
 691         case BLKROSET:
 692         case BLKDISCARD:
 693         case BLKSECDISCARD:
 694         case BLKZEROOUT:
 695         /*
 696          * the ones below are implemented in blkdev_locked_ioctl,
 697          * but we call blkdev_ioctl, which gets the lock for us
 698          */
 699         case BLKRRPART:
 700                 return blkdev_ioctl(bdev, mode, cmd,
 701                                 (unsigned long)compat_ptr(arg));
 702         case BLKBSZSET_32:
 703                 return blkdev_ioctl(bdev, mode, BLKBSZSET,
 704                                 (unsigned long)compat_ptr(arg));
 705         case BLKPG:
 706                 return compat_blkpg_ioctl(bdev, mode, cmd, compat_ptr(arg));
 707         case BLKRAGET:
 708         case BLKFRAGET:
 709                 if (!arg)
 710                         return -EINVAL;
 711                 bdi = blk_get_backing_dev_info(bdev);
 712                 if (bdi == NULL)
 713                         return -ENOTTY;
 714                 return compat_put_long(arg,
 715                                        (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
 716         case BLKROGET: /* compatible */
 717                 return compat_put_int(arg, bdev_read_only(bdev) != 0);
 718         case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
 719                 return compat_put_int(arg, block_size(bdev));
 720         case BLKSSZGET: /* get block device hardware sector size */
 721                 return compat_put_int(arg, bdev_logical_block_size(bdev));
 722         case BLKSECTGET:
 723                 max_sectors = min_t(unsigned int, USHRT_MAX,
 724                                     queue_max_sectors(bdev_get_queue(bdev)));
 725                 return compat_put_ushort(arg, max_sectors);
 726         case BLKROTATIONAL:
 727                 return compat_put_ushort(arg,
 728                                          !blk_queue_nonrot(bdev_get_queue(bdev)));
 729         case BLKRASET: /* compatible, but no compat_ptr (!) */
 730         case BLKFRASET:
 731                 if (!capable(CAP_SYS_ADMIN))
 732                         return -EACCES;
 733                 bdi = blk_get_backing_dev_info(bdev);
 734                 if (bdi == NULL)
 735                         return -ENOTTY;
 736                 bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
 737                 return 0;
 738         case BLKGETSIZE:
 739                 size = i_size_read(bdev->bd_inode);
 740                 if ((size >> 9) > ~0UL)
 741                         return -EFBIG;
 742                 return compat_put_ulong(arg, size >> 9);
 743
 744         case BLKGETSIZE64_32:
 745                 return compat_put_u64(arg, i_size_read(bdev->bd_inode));
 746
 747         case BLKTRACESETUP32:
 748         case BLKTRACESTART: /* compatible */
 749         case BLKTRACESTOP:  /* compatible */
 750         case BLKTRACETEARDOWN: /* compatible */
 751                 ret = blk_trace_ioctl(bdev, cmd, compat_ptr(arg));
 752                 return ret;
 753         default:
 754                 if (disk->fops->compat_ioctl)
 755                         ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
 756                 if (ret == -ENOIOCTLCMD)
 757                         ret = compat_blkdev_driver_ioctl(bdev, mode, cmd, arg);
 758                 return ret;
 759         }
 760 }