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_uint(unsigned long arg, unsigned int val)
  25 {
  26         return put_user(val, (compat_uint_t __user *)compat_ptr(arg));
  27 }
  28
  29 static int compat_put_long(unsigned long arg, long val)
  30 {
  31         return put_user(val, (compat_long_t __user *)compat_ptr(arg));
  32 }
  33
  34 static int compat_put_ulong(unsigned long arg, compat_ulong_t val)
  35 {
  36         return put_user(val, (compat_ulong_t __user *)compat_ptr(arg));
  37 }
  38
  39 static int compat_put_u64(unsigned long arg, u64 val)
  40 {
  41         return put_user(val, (compat_u64 __user *)compat_ptr(arg));
  42 }
  43
  44 struct compat_hd_geometry {
  45         unsigned char heads;
  46         unsigned char sectors;
  47         unsigned short cylinders;
  48         u32 start;
  49 };
  50
  51 static int compat_hdio_getgeo(struct gendisk *disk, struct block_device *bdev,
  52                         struct compat_hd_geometry __user *ugeo)
  53 {
  54         struct hd_geometry geo;
  55         int ret;
  56
  57         if (!ugeo)
  58                 return -EINVAL;
  59         if (!disk->fops->getgeo)
  60                 return -ENOTTY;
  61
  62         /*
  63          * We need to set the startsect first, the driver may
  64          * want to override it.
  65          */
  66         geo.start = get_start_sect(bdev);
  67         ret = disk->fops->getgeo(bdev, &geo);
  68         if (ret)
  69                 return ret;
  70
  71         ret = copy_to_user(ugeo, &geo, 4);
  72         ret |= __put_user(geo.start, &ugeo->start);
  73         if (ret)
  74                 ret = -EFAULT;
  75
  76         return ret;
  77 }
  78
  79 static int compat_hdio_ioctl(struct block_device *bdev, fmode_t mode,
  80                 unsigned int cmd, unsigned long arg)
  81 {
  82         mm_segment_t old_fs = get_fs();
  83         unsigned long kval;
  84         unsigned int __user *uvp;
  85         int error;
  86
  87         set_fs(KERNEL_DS);
  88         error = __blkdev_driver_ioctl(bdev, mode,
  89                                 cmd, (unsigned long)(&kval));
  90         set_fs(old_fs);
  91
  92         if (error == 0) {
  93                 uvp = compat_ptr(arg);
  94                 if (put_user(kval, uvp))
  95                         error = -EFAULT;
  96         }
  97         return error;
  98 }
  99
 100 struct compat_cdrom_read_audio {
 101         union cdrom_addr        addr;
 102         u8                      addr_format;
 103         compat_int_t            nframes;
 104         compat_caddr_t          buf;
 105 };
 106
 107 struct compat_cdrom_generic_command {
 108         unsigned char   cmd[CDROM_PACKET_SIZE];
 109         compat_caddr_t  buffer;
 110         compat_uint_t   buflen;
 111         compat_int_t    stat;
 112         compat_caddr_t  sense;
 113         unsigned char   data_direction;
 114         compat_int_t    quiet;
 115         compat_int_t    timeout;
 116         compat_caddr_t  reserved[1];
 117 };
 118
 119 static int compat_cdrom_read_audio(struct block_device *bdev, fmode_t mode,
 120                 unsigned int cmd, unsigned long arg)
 121 {
 122         struct cdrom_read_audio __user *cdread_audio;
 123         struct compat_cdrom_read_audio __user *cdread_audio32;
 124         __u32 data;
 125         void __user *datap;
 126
 127         cdread_audio = compat_alloc_user_space(sizeof(*cdread_audio));
 128         cdread_audio32 = compat_ptr(arg);
 129
 130         if (copy_in_user(&cdread_audio->addr,
 131                          &cdread_audio32->addr,
 132                          (sizeof(*cdread_audio32) -
 133                           sizeof(compat_caddr_t))))
 134                 return -EFAULT;
 135
 136         if (get_user(data, &cdread_audio32->buf))
 137                 return -EFAULT;
 138         datap = compat_ptr(data);
 139         if (put_user(datap, &cdread_audio->buf))
 140                 return -EFAULT;
 141
 142         return __blkdev_driver_ioctl(bdev, mode, cmd,
 143                         (unsigned long)cdread_audio);
 144 }
 145
 146 static int compat_cdrom_generic_command(struct block_device *bdev, fmode_t mode,
 147                 unsigned int cmd, unsigned long arg)
 148 {
 149         struct cdrom_generic_command __user *cgc;
 150         struct compat_cdrom_generic_command __user *cgc32;
 151         u32 data;
 152         unsigned char dir;
 153         int itmp;
 154
 155         cgc = compat_alloc_user_space(sizeof(*cgc));
 156         cgc32 = compat_ptr(arg);
 157
 158         if (copy_in_user(&cgc->cmd, &cgc32->cmd, sizeof(cgc->cmd)) ||
 159             get_user(data, &cgc32->buffer) ||
 160             put_user(compat_ptr(data), &cgc->buffer) ||
 161             copy_in_user(&cgc->buflen, &cgc32->buflen,
 162                          (sizeof(unsigned int) + sizeof(int))) ||
 163             get_user(data, &cgc32->sense) ||
 164             put_user(compat_ptr(data), &cgc->sense) ||
 165             get_user(dir, &cgc32->data_direction) ||
 166             put_user(dir, &cgc->data_direction) ||
 167             get_user(itmp, &cgc32->quiet) ||
 168             put_user(itmp, &cgc->quiet) ||
 169             get_user(itmp, &cgc32->timeout) ||
 170             put_user(itmp, &cgc->timeout) ||
 171             get_user(data, &cgc32->reserved[0]) ||
 172             put_user(compat_ptr(data), &cgc->reserved[0]))
 173                 return -EFAULT;
 174
 175         return __blkdev_driver_ioctl(bdev, mode, cmd, (unsigned long)cgc);
 176 }
 177
 178 struct compat_blkpg_ioctl_arg {
 179         compat_int_t op;
 180         compat_int_t flags;
 181         compat_int_t datalen;
 182         compat_caddr_t data;
 183 };
 184
 185 static int compat_blkpg_ioctl(struct block_device *bdev, fmode_t mode,
 186                 unsigned int cmd, struct compat_blkpg_ioctl_arg __user *ua32)
 187 {
 188         struct blkpg_ioctl_arg __user *a = compat_alloc_user_space(sizeof(*a));
 189         compat_caddr_t udata;
 190         compat_int_t n;
 191         int err;
 192
 193         err = get_user(n, &ua32->op);
 194         err |= put_user(n, &a->op);
 195         err |= get_user(n, &ua32->flags);
 196         err |= put_user(n, &a->flags);
 197         err |= get_user(n, &ua32->datalen);
 198         err |= put_user(n, &a->datalen);
 199         err |= get_user(udata, &ua32->data);
 200         err |= put_user(compat_ptr(udata), &a->data);
 201         if (err)
 202                 return err;
 203
 204         return blkdev_ioctl(bdev, mode, cmd, (unsigned long)a);
 205 }
 206
 207 #define BLKBSZGET_32            _IOR(0x12, 112, int)
 208 #define BLKBSZSET_32            _IOW(0x12, 113, int)
 209 #define BLKGETSIZE64_32         _IOR(0x12, 114, int)
 210
 211 struct compat_floppy_struct {
 212         compat_uint_t   size;
 213         compat_uint_t   sect;
 214         compat_uint_t   head;
 215         compat_uint_t   track;
 216         compat_uint_t   stretch;
 217         unsigned char   gap;
 218         unsigned char   rate;
 219         unsigned char   spec1;
 220         unsigned char   fmt_gap;
 221         const compat_caddr_t name;
 222 };
 223
 224 struct compat_floppy_drive_params {
 225         char            cmos;
 226         compat_ulong_t  max_dtr;
 227         compat_ulong_t  hlt;
 228         compat_ulong_t  hut;
 229         compat_ulong_t  srt;
 230         compat_ulong_t  spinup;
 231         compat_ulong_t  spindown;
 232         unsigned char   spindown_offset;
 233         unsigned char   select_delay;
 234         unsigned char   rps;
 235         unsigned char   tracks;
 236         compat_ulong_t  timeout;
 237         unsigned char   interleave_sect;
 238         struct floppy_max_errors max_errors;
 239         char            flags;
 240         char            read_track;
 241         short           autodetect[8];
 242         compat_int_t    checkfreq;
 243         compat_int_t    native_format;
 244 };
 245
 246 struct compat_floppy_drive_struct {
 247         signed char     flags;
 248         compat_ulong_t  spinup_date;
 249         compat_ulong_t  select_date;
 250         compat_ulong_t  first_read_date;
 251         short           probed_format;
 252         short           track;
 253         short           maxblock;
 254         short           maxtrack;
 255         compat_int_t    generation;
 256         compat_int_t    keep_data;
 257         compat_int_t    fd_ref;
 258         compat_int_t    fd_device;
 259         compat_int_t    last_checked;
 260         compat_caddr_t dmabuf;
 261         compat_int_t    bufblocks;
 262 };
 263
 264 struct compat_floppy_fdc_state {
 265         compat_int_t    spec1;
 266         compat_int_t    spec2;
 267         compat_int_t    dtr;
 268         unsigned char   version;
 269         unsigned char   dor;
 270         compat_ulong_t  address;
 271         unsigned int    rawcmd:2;
 272         unsigned int    reset:1;
 273         unsigned int    need_configure:1;
 274         unsigned int    perp_mode:2;
 275         unsigned int    has_fifo:1;
 276         unsigned int    driver_version;
 277         unsigned char   track[4];
 278 };
 279
 280 struct compat_floppy_write_errors {
 281         unsigned int    write_errors;
 282         compat_ulong_t  first_error_sector;
 283         compat_int_t    first_error_generation;
 284         compat_ulong_t  last_error_sector;
 285         compat_int_t    last_error_generation;
 286         compat_uint_t   badness;
 287 };
 288
 289 #define FDSETPRM32 _IOW(2, 0x42, struct compat_floppy_struct)
 290 #define FDDEFPRM32 _IOW(2, 0x43, struct compat_floppy_struct)
 291 #define FDGETPRM32 _IOR(2, 0x04, struct compat_floppy_struct)
 292 #define FDSETDRVPRM32 _IOW(2, 0x90, struct compat_floppy_drive_params)
 293 #define FDGETDRVPRM32 _IOR(2, 0x11, struct compat_floppy_drive_params)
 294 #define FDGETDRVSTAT32 _IOR(2, 0x12, struct compat_floppy_drive_struct)
 295 #define FDPOLLDRVSTAT32 _IOR(2, 0x13, struct compat_floppy_drive_struct)
 296 #define FDGETFDCSTAT32 _IOR(2, 0x15, struct compat_floppy_fdc_state)
 297 #define FDWERRORGET32  _IOR(2, 0x17, struct compat_floppy_write_errors)
 298
 299 static struct {
 300         unsigned int    cmd32;
 301         unsigned int    cmd;
 302 } fd_ioctl_trans_table[] = {
 303         { FDSETPRM32, FDSETPRM },
 304         { FDDEFPRM32, FDDEFPRM },
 305         { FDGETPRM32, FDGETPRM },
 306         { FDSETDRVPRM32, FDSETDRVPRM },
 307         { FDGETDRVPRM32, FDGETDRVPRM },
 308         { FDGETDRVSTAT32, FDGETDRVSTAT },
 309         { FDPOLLDRVSTAT32, FDPOLLDRVSTAT },
 310         { FDGETFDCSTAT32, FDGETFDCSTAT },
 311         { FDWERRORGET32, FDWERRORGET }
 312 };
 313
 314 #define NR_FD_IOCTL_TRANS ARRAY_SIZE(fd_ioctl_trans_table)
 315
 316 static int compat_fd_ioctl(struct block_device *bdev, fmode_t mode,
 317                 unsigned int cmd, unsigned long arg)
 318 {
 319         mm_segment_t old_fs = get_fs();
 320         void *karg = NULL;
 321         unsigned int kcmd = 0;
 322         int i, err;
 323
 324         for (i = 0; i < NR_FD_IOCTL_TRANS; i++)
 325                 if (cmd == fd_ioctl_trans_table[i].cmd32) {
 326                         kcmd = fd_ioctl_trans_table[i].cmd;
 327                         break;
 328                 }
 329         if (!kcmd)
 330                 return -EINVAL;
 331
 332         switch (cmd) {
 333         case FDSETPRM32:
 334         case FDDEFPRM32:
 335         case FDGETPRM32:
 336         {
 337                 compat_uptr_t name;
 338                 struct compat_floppy_struct __user *uf;
 339                 struct floppy_struct *f;
 340
 341                 uf = compat_ptr(arg);
 342                 f = karg = kmalloc(sizeof(struct floppy_struct), GFP_KERNEL);
 343                 if (!karg)
 344                         return -ENOMEM;
 345                 if (cmd == FDGETPRM32)
 346                         break;
 347                 err = __get_user(f->size, &uf->size);
 348                 err |= __get_user(f->sect, &uf->sect);
 349                 err |= __get_user(f->head, &uf->head);
 350                 err |= __get_user(f->track, &uf->track);
 351                 err |= __get_user(f->stretch, &uf->stretch);
 352                 err |= __get_user(f->gap, &uf->gap);
 353                 err |= __get_user(f->rate, &uf->rate);
 354                 err |= __get_user(f->spec1, &uf->spec1);
 355                 err |= __get_user(f->fmt_gap, &uf->fmt_gap);
 356                 err |= __get_user(name, &uf->name);
 357                 f->name = compat_ptr(name);
 358                 if (err) {
 359                         err = -EFAULT;
 360                         goto out;
 361                 }
 362                 break;
 363         }
 364         case FDSETDRVPRM32:
 365         case FDGETDRVPRM32:
 366         {
 367                 struct compat_floppy_drive_params __user *uf;
 368                 struct floppy_drive_params *f;
 369
 370                 uf = compat_ptr(arg);
 371                 f = karg = kmalloc(sizeof(struct floppy_drive_params), GFP_KERNEL);
 372                 if (!karg)
 373                         return -ENOMEM;
 374                 if (cmd == FDGETDRVPRM32)
 375                         break;
 376                 err = __get_user(f->cmos, &uf->cmos);
 377                 err |= __get_user(f->max_dtr, &uf->max_dtr);
 378                 err |= __get_user(f->hlt, &uf->hlt);
 379                 err |= __get_user(f->hut, &uf->hut);
 380                 err |= __get_user(f->srt, &uf->srt);
 381                 err |= __get_user(f->spinup, &uf->spinup);
 382                 err |= __get_user(f->spindown, &uf->spindown);
 383                 err |= __get_user(f->spindown_offset, &uf->spindown_offset);
 384                 err |= __get_user(f->select_delay, &uf->select_delay);
 385                 err |= __get_user(f->rps, &uf->rps);
 386                 err |= __get_user(f->tracks, &uf->tracks);
 387                 err |= __get_user(f->timeout, &uf->timeout);
 388                 err |= __get_user(f->interleave_sect, &uf->interleave_sect);
 389                 err |= __copy_from_user(&f->max_errors, &uf->max_errors, sizeof(f->max_errors));
 390                 err |= __get_user(f->flags, &uf->flags);
 391                 err |= __get_user(f->read_track, &uf->read_track);
 392                 err |= __copy_from_user(f->autodetect, uf->autodetect, sizeof(f->autodetect));
 393                 err |= __get_user(f->checkfreq, &uf->checkfreq);
 394                 err |= __get_user(f->native_format, &uf->native_format);
 395                 if (err) {
 396                         err = -EFAULT;
 397                         goto out;
 398                 }
 399                 break;
 400         }
 401         case FDGETDRVSTAT32:
 402         case FDPOLLDRVSTAT32:
 403                 karg = kmalloc(sizeof(struct floppy_drive_struct), GFP_KERNEL);
 404                 if (!karg)
 405                         return -ENOMEM;
 406                 break;
 407         case FDGETFDCSTAT32:
 408                 karg = kmalloc(sizeof(struct floppy_fdc_state), GFP_KERNEL);
 409                 if (!karg)
 410                         return -ENOMEM;
 411                 break;
 412         case FDWERRORGET32:
 413                 karg = kmalloc(sizeof(struct floppy_write_errors), GFP_KERNEL);
 414                 if (!karg)
 415                         return -ENOMEM;
 416                 break;
 417         default:
 418                 return -EINVAL;
 419         }
 420         set_fs(KERNEL_DS);
 421         err = __blkdev_driver_ioctl(bdev, mode, kcmd, (unsigned long)karg);
 422         set_fs(old_fs);
 423         if (err)
 424                 goto out;
 425         switch (cmd) {
 426         case FDGETPRM32:
 427         {
 428                 struct floppy_struct *f = karg;
 429                 struct compat_floppy_struct __user *uf = compat_ptr(arg);
 430
 431                 err = __put_user(f->size, &uf->size);
 432                 err |= __put_user(f->sect, &uf->sect);
 433                 err |= __put_user(f->head, &uf->head);
 434                 err |= __put_user(f->track, &uf->track);
 435                 err |= __put_user(f->stretch, &uf->stretch);
 436                 err |= __put_user(f->gap, &uf->gap);
 437                 err |= __put_user(f->rate, &uf->rate);
 438                 err |= __put_user(f->spec1, &uf->spec1);
 439                 err |= __put_user(f->fmt_gap, &uf->fmt_gap);
 440                 err |= __put_user((u64)f->name, (compat_caddr_t __user *)&uf->name);
 441                 break;
 442         }
 443         case FDGETDRVPRM32:
 444         {
 445                 struct compat_floppy_drive_params __user *uf;
 446                 struct floppy_drive_params *f = karg;
 447
 448                 uf = compat_ptr(arg);
 449                 err = __put_user(f->cmos, &uf->cmos);
 450                 err |= __put_user(f->max_dtr, &uf->max_dtr);
 451                 err |= __put_user(f->hlt, &uf->hlt);
 452                 err |= __put_user(f->hut, &uf->hut);
 453                 err |= __put_user(f->srt, &uf->srt);
 454                 err |= __put_user(f->spinup, &uf->spinup);
 455                 err |= __put_user(f->spindown, &uf->spindown);
 456                 err |= __put_user(f->spindown_offset, &uf->spindown_offset);
 457                 err |= __put_user(f->select_delay, &uf->select_delay);
 458                 err |= __put_user(f->rps, &uf->rps);
 459                 err |= __put_user(f->tracks, &uf->tracks);
 460                 err |= __put_user(f->timeout, &uf->timeout);
 461                 err |= __put_user(f->interleave_sect, &uf->interleave_sect);
 462                 err |= __copy_to_user(&uf->max_errors, &f->max_errors, sizeof(f->max_errors));
 463                 err |= __put_user(f->flags, &uf->flags);
 464                 err |= __put_user(f->read_track, &uf->read_track);
 465                 err |= __copy_to_user(uf->autodetect, f->autodetect, sizeof(f->autodetect));
 466                 err |= __put_user(f->checkfreq, &uf->checkfreq);
 467                 err |= __put_user(f->native_format, &uf->native_format);
 468                 break;
 469         }
 470         case FDGETDRVSTAT32:
 471         case FDPOLLDRVSTAT32:
 472         {
 473                 struct compat_floppy_drive_struct __user *uf;
 474                 struct floppy_drive_struct *f = karg;
 475
 476                 uf = compat_ptr(arg);
 477                 err = __put_user(f->flags, &uf->flags);
 478                 err |= __put_user(f->spinup_date, &uf->spinup_date);
 479                 err |= __put_user(f->select_date, &uf->select_date);
 480                 err |= __put_user(f->first_read_date, &uf->first_read_date);
 481                 err |= __put_user(f->probed_format, &uf->probed_format);
 482                 err |= __put_user(f->track, &uf->track);
 483                 err |= __put_user(f->maxblock, &uf->maxblock);
 484                 err |= __put_user(f->maxtrack, &uf->maxtrack);
 485                 err |= __put_user(f->generation, &uf->generation);
 486                 err |= __put_user(f->keep_data, &uf->keep_data);
 487                 err |= __put_user(f->fd_ref, &uf->fd_ref);
 488                 err |= __put_user(f->fd_device, &uf->fd_device);
 489                 err |= __put_user(f->last_checked, &uf->last_checked);
 490                 err |= __put_user((u64)f->dmabuf, &uf->dmabuf);
 491                 err |= __put_user((u64)f->bufblocks, &uf->bufblocks);
 492                 break;
 493         }
 494         case FDGETFDCSTAT32:
 495         {
 496                 struct compat_floppy_fdc_state __user *uf;
 497                 struct floppy_fdc_state *f = karg;
 498
 499                 uf = compat_ptr(arg);
 500                 err = __put_user(f->spec1, &uf->spec1);
 501                 err |= __put_user(f->spec2, &uf->spec2);
 502                 err |= __put_user(f->dtr, &uf->dtr);
 503                 err |= __put_user(f->version, &uf->version);
 504                 err |= __put_user(f->dor, &uf->dor);
 505                 err |= __put_user(f->address, &uf->address);
 506                 err |= __copy_to_user((char __user *)&uf->address + sizeof(uf->address),
 507                                    (char *)&f->address + sizeof(f->address), sizeof(int));
 508                 err |= __put_user(f->driver_version, &uf->driver_version);
 509                 err |= __copy_to_user(uf->track, f->track, sizeof(f->track));
 510                 break;
 511         }
 512         case FDWERRORGET32:
 513         {
 514                 struct compat_floppy_write_errors __user *uf;
 515                 struct floppy_write_errors *f = karg;
 516
 517                 uf = compat_ptr(arg);
 518                 err = __put_user(f->write_errors, &uf->write_errors);
 519                 err |= __put_user(f->first_error_sector, &uf->first_error_sector);
 520                 err |= __put_user(f->first_error_generation, &uf->first_error_generation);
 521                 err |= __put_user(f->last_error_sector, &uf->last_error_sector);
 522                 err |= __put_user(f->last_error_generation, &uf->last_error_generation);
 523                 err |= __put_user(f->badness, &uf->badness);
 524                 break;
 525         }
 526         default:
 527                 break;
 528         }
 529         if (err)
 530                 err = -EFAULT;
 531
 532 out:
 533         kfree(karg);
 534         return err;
 535 }
 536
 537 struct compat_blk_user_trace_setup {
 538         char name[32];
 539         u16 act_mask;
 540         u32 buf_size;
 541         u32 buf_nr;
 542         compat_u64 start_lba;
 543         compat_u64 end_lba;
 544         u32 pid;
 545 };
 546 #define BLKTRACESETUP32 _IOWR(0x12, 115, struct compat_blk_user_trace_setup)
 547
 548 static int compat_blk_trace_setup(struct block_device *bdev, char __user *arg)
 549 {
 550         struct blk_user_trace_setup buts;
 551         struct compat_blk_user_trace_setup cbuts;
 552         struct request_queue *q;
 553         char b[BDEVNAME_SIZE];
 554         int ret;
 555
 556         q = bdev_get_queue(bdev);
 557         if (!q)
 558                 return -ENXIO;
 559
 560         if (copy_from_user(&cbuts, arg, sizeof(cbuts)))
 561                 return -EFAULT;
 562
 563         bdevname(bdev, b);
 564
 565         buts = (struct blk_user_trace_setup) {
 566                 .act_mask = cbuts.act_mask,
 567                 .buf_size = cbuts.buf_size,
 568                 .buf_nr = cbuts.buf_nr,
 569                 .start_lba = cbuts.start_lba,
 570                 .end_lba = cbuts.end_lba,
 571                 .pid = cbuts.pid,
 572         };
 573         memcpy(&buts.name, &cbuts.name, 32);
 574
 575         mutex_lock(&bdev->bd_mutex);
 576         ret = do_blk_trace_setup(q, b, bdev->bd_dev, bdev, &buts);
 577         mutex_unlock(&bdev->bd_mutex);
 578         if (ret)
 579                 return ret;
 580
 581         if (copy_to_user(arg, &buts.name, 32))
 582                 return -EFAULT;
 583
 584         return 0;
 585 }
 586
 587 static int compat_blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
 588                         unsigned cmd, unsigned long arg)
 589 {
 590         switch (cmd) {
 591         case HDIO_GET_UNMASKINTR:
 592         case HDIO_GET_MULTCOUNT:
 593         case HDIO_GET_KEEPSETTINGS:
 594         case HDIO_GET_32BIT:
 595         case HDIO_GET_NOWERR:
 596         case HDIO_GET_DMA:
 597         case HDIO_GET_NICE:
 598         case HDIO_GET_WCACHE:
 599         case HDIO_GET_ACOUSTIC:
 600         case HDIO_GET_ADDRESS:
 601         case HDIO_GET_BUSSTATE:
 602                 return compat_hdio_ioctl(bdev, mode, cmd, arg);
 603         case FDSETPRM32:
 604         case FDDEFPRM32:
 605         case FDGETPRM32:
 606         case FDSETDRVPRM32:
 607         case FDGETDRVPRM32:
 608         case FDGETDRVSTAT32:
 609         case FDPOLLDRVSTAT32:
 610         case FDGETFDCSTAT32:
 611         case FDWERRORGET32:
 612                 return compat_fd_ioctl(bdev, mode, cmd, arg);
 613         case CDROMREADAUDIO:
 614                 return compat_cdrom_read_audio(bdev, mode, cmd, arg);
 615         case CDROM_SEND_PACKET:
 616                 return compat_cdrom_generic_command(bdev, mode, cmd, arg);
 617
 618         /*
 619          * No handler required for the ones below, we just need to
 620          * convert arg to a 64 bit pointer.
 621          */
 622         case BLKSECTSET:
 623         /*
 624          * 0x03 -- HD/IDE ioctl's used by hdparm and friends.
 625          *         Some need translations, these do not.
 626          */
 627         case HDIO_GET_IDENTITY:
 628         case HDIO_DRIVE_TASK:
 629         case HDIO_DRIVE_CMD:
 630         /* 0x330 is reserved -- it used to be HDIO_GETGEO_BIG */
 631         case 0x330:
 632         /* 0x02 -- Floppy ioctls */
 633         case FDMSGON:
 634         case FDMSGOFF:
 635         case FDSETEMSGTRESH:
 636         case FDFLUSH:
 637         case FDWERRORCLR:
 638         case FDSETMAXERRS:
 639         case FDGETMAXERRS:
 640         case FDGETDRVTYP:
 641         case FDEJECT:
 642         case FDCLRPRM:
 643         case FDFMTBEG:
 644         case FDFMTEND:
 645         case FDRESET:
 646         case FDTWADDLE:
 647         case FDFMTTRK:
 648         case FDRAWCMD:
 649         /* CDROM stuff */
 650         case CDROMPAUSE:
 651         case CDROMRESUME:
 652         case CDROMPLAYMSF:
 653         case CDROMPLAYTRKIND:
 654         case CDROMREADTOCHDR:
 655         case CDROMREADTOCENTRY:
 656         case CDROMSTOP:
 657         case CDROMSTART:
 658         case CDROMEJECT:
 659         case CDROMVOLCTRL:
 660         case CDROMSUBCHNL:
 661         case CDROMMULTISESSION:
 662         case CDROM_GET_MCN:
 663         case CDROMRESET:
 664         case CDROMVOLREAD:
 665         case CDROMSEEK:
 666         case CDROMPLAYBLK:
 667         case CDROMCLOSETRAY:
 668         case CDROM_DISC_STATUS:
 669         case CDROM_CHANGER_NSLOTS:
 670         case CDROM_GET_CAPABILITY:
 671         /* Ignore cdrom.h about these next 5 ioctls, they absolutely do
 672          * not take a struct cdrom_read, instead they take a struct cdrom_msf
 673          * which is compatible.
 674          */
 675         case CDROMREADMODE2:
 676         case CDROMREADMODE1:
 677         case CDROMREADRAW:
 678         case CDROMREADCOOKED:
 679         case CDROMREADALL:
 680         /* DVD ioctls */
 681         case DVD_READ_STRUCT:
 682         case DVD_WRITE_STRUCT:
 683         case DVD_AUTH:
 684                 arg = (unsigned long)compat_ptr(arg);
 685         /* These intepret arg as an unsigned long, not as a pointer,
 686          * so we must not do compat_ptr() conversion. */
 687         case HDIO_SET_MULTCOUNT:
 688         case HDIO_SET_UNMASKINTR:
 689         case HDIO_SET_KEEPSETTINGS:
 690         case HDIO_SET_32BIT:
 691         case HDIO_SET_NOWERR:
 692         case HDIO_SET_DMA:
 693         case HDIO_SET_PIO_MODE:
 694         case HDIO_SET_NICE:
 695         case HDIO_SET_WCACHE:
 696         case HDIO_SET_ACOUSTIC:
 697         case HDIO_SET_BUSSTATE:
 698         case HDIO_SET_ADDRESS:
 699         case CDROMEJECT_SW:
 700         case CDROM_SET_OPTIONS:
 701         case CDROM_CLEAR_OPTIONS:
 702         case CDROM_SELECT_SPEED:
 703         case CDROM_SELECT_DISC:
 704         case CDROM_MEDIA_CHANGED:
 705         case CDROM_DRIVE_STATUS:
 706         case CDROM_LOCKDOOR:
 707         case CDROM_DEBUG:
 708                 break;
 709         default:
 710                 /* unknown ioctl number */
 711                 return -ENOIOCTLCMD;
 712         }
 713
 714         return __blkdev_driver_ioctl(bdev, mode, cmd, arg);
 715 }
 716
 717 /* Most of the generic ioctls are handled in the normal fallback path.
 718    This assumes the blkdev's low level compat_ioctl always returns
 719    ENOIOCTLCMD for unknown ioctls. */
 720 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 721 {
 722         int ret = -ENOIOCTLCMD;
 723         struct inode *inode = file->f_mapping->host;
 724         struct block_device *bdev = inode->i_bdev;
 725         struct gendisk *disk = bdev->bd_disk;
 726         fmode_t mode = file->f_mode;
 727         struct backing_dev_info *bdi;
 728         loff_t size;
 729
 730         /*
 731          * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
 732          * to updated it before every ioctl.
 733          */
 734         if (file->f_flags & O_NDELAY)
 735                 mode |= FMODE_NDELAY;
 736         else
 737                 mode &= ~FMODE_NDELAY;
 738
 739         switch (cmd) {
 740         case HDIO_GETGEO:
 741                 return compat_hdio_getgeo(disk, bdev, compat_ptr(arg));
 742         case BLKPBSZGET:
 743                 return compat_put_uint(arg, bdev_physical_block_size(bdev));
 744         case BLKIOMIN:
 745                 return compat_put_uint(arg, bdev_io_min(bdev));
 746         case BLKIOOPT:
 747                 return compat_put_uint(arg, bdev_io_opt(bdev));
 748         case BLKALIGNOFF:
 749                 return compat_put_int(arg, bdev_alignment_offset(bdev));
 750         case BLKFLSBUF:
 751         case BLKROSET:
 752         case BLKDISCARD:
 753         /*
 754          * the ones below are implemented in blkdev_locked_ioctl,
 755          * but we call blkdev_ioctl, which gets the lock for us
 756          */
 757         case BLKRRPART:
 758                 return blkdev_ioctl(bdev, mode, cmd,
 759                                 (unsigned long)compat_ptr(arg));
 760         case BLKBSZSET_32:
 761                 return blkdev_ioctl(bdev, mode, BLKBSZSET,
 762                                 (unsigned long)compat_ptr(arg));
 763         case BLKPG:
 764                 return compat_blkpg_ioctl(bdev, mode, cmd, compat_ptr(arg));
 765         case BLKRAGET:
 766         case BLKFRAGET:
 767                 if (!arg)
 768                         return -EINVAL;
 769                 bdi = blk_get_backing_dev_info(bdev);
 770                 if (bdi == NULL)
 771                         return -ENOTTY;
 772                 return compat_put_long(arg,
 773                                        (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
 774         case BLKROGET: /* compatible */
 775                 return compat_put_int(arg, bdev_read_only(bdev) != 0);
 776         case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
 777                 return compat_put_int(arg, block_size(bdev));
 778         case BLKSSZGET: /* get block device hardware sector size */
 779                 return compat_put_int(arg, bdev_logical_block_size(bdev));
 780         case BLKSECTGET:
 781                 return compat_put_ushort(arg,
 782                                          queue_max_sectors(bdev_get_queue(bdev)));
 783         case BLKRASET: /* compatible, but no compat_ptr (!) */
 784         case BLKFRASET:
 785                 if (!capable(CAP_SYS_ADMIN))
 786                         return -EACCES;
 787                 bdi = blk_get_backing_dev_info(bdev);
 788                 if (bdi == NULL)
 789                         return -ENOTTY;
 790                 bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
 791                 return 0;
 792         case BLKGETSIZE:
 793                 size = bdev->bd_inode->i_size;
 794                 if ((size >> 9) > ~0UL)
 795                         return -EFBIG;
 796                 return compat_put_ulong(arg, size >> 9);
 797
 798         case BLKGETSIZE64_32:
 799                 return compat_put_u64(arg, bdev->bd_inode->i_size);
 800
 801         case BLKTRACESETUP32:
 802                 lock_kernel();
 803                 ret = compat_blk_trace_setup(bdev, compat_ptr(arg));
 804                 unlock_kernel();
 805                 return ret;
 806         case BLKTRACESTART: /* compatible */
 807         case BLKTRACESTOP:  /* compatible */
 808         case BLKTRACETEARDOWN: /* compatible */
 809                 lock_kernel();
 810                 ret = blk_trace_ioctl(bdev, cmd, compat_ptr(arg));
 811                 unlock_kernel();
 812                 return ret;
 813         default:
 814                 if (disk->fops->compat_ioctl)
 815                         ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
 816                 if (ret == -ENOIOCTLCMD)
 817                         ret = compat_blkdev_driver_ioctl(bdev, mode, cmd, arg);
 818                 return ret;
 819         }
 820 }