linux/block/compat_ioctl.c
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   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
  14static int compat_put_ushort(unsigned long arg, unsigned short val)
  15{
  16        return put_user(val, (unsigned short __user *)compat_ptr(arg));
  17}
  18
  19static int compat_put_int(unsigned long arg, int val)
  20{
  21        return put_user(val, (compat_int_t __user *)compat_ptr(arg));
  22}
  23
  24static 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
  29static int compat_put_long(unsigned long arg, long val)
  30{
  31        return put_user(val, (compat_long_t __user *)compat_ptr(arg));
  32}
  33
  34static 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
  39static int compat_put_u64(unsigned long arg, u64 val)
  40{
  41        return put_user(val, (compat_u64 __user *)compat_ptr(arg));
  42}
  43
  44struct compat_hd_geometry {
  45        unsigned char heads;
  46        unsigned char sectors;
  47        unsigned short cylinders;
  48        u32 start;
  49};
  50
  51static 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
  80static 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
 101struct 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
 108struct 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
 120static 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
 147static 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
 179struct 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
 186static 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
 212struct 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
 234struct 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
 252struct 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
 268struct 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
 286static 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
 303static 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
 519out:
 520        kfree(karg);
 521        return err;
 522}
 523
 524static 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. */
 657long 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
 667        /*
 668         * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
 669         * to updated it before every ioctl.
 670         */
 671        if (file->f_flags & O_NDELAY)
 672                mode |= FMODE_NDELAY;
 673        else
 674                mode &= ~FMODE_NDELAY;
 675
 676        switch (cmd) {
 677        case HDIO_GETGEO:
 678                return compat_hdio_getgeo(disk, bdev, compat_ptr(arg));
 679        case BLKPBSZGET:
 680                return compat_put_uint(arg, bdev_physical_block_size(bdev));
 681        case BLKIOMIN:
 682                return compat_put_uint(arg, bdev_io_min(bdev));
 683        case BLKIOOPT:
 684                return compat_put_uint(arg, bdev_io_opt(bdev));
 685        case BLKALIGNOFF:
 686                return compat_put_int(arg, bdev_alignment_offset(bdev));
 687        case BLKDISCARDZEROES:
 688                return compat_put_uint(arg, bdev_discard_zeroes_data(bdev));
 689        case BLKFLSBUF:
 690        case BLKROSET:
 691        case BLKDISCARD:
 692        case BLKSECDISCARD:
 693        /*
 694         * the ones below are implemented in blkdev_locked_ioctl,
 695         * but we call blkdev_ioctl, which gets the lock for us
 696         */
 697        case BLKRRPART:
 698                return blkdev_ioctl(bdev, mode, cmd,
 699                                (unsigned long)compat_ptr(arg));
 700        case BLKBSZSET_32:
 701                return blkdev_ioctl(bdev, mode, BLKBSZSET,
 702                                (unsigned long)compat_ptr(arg));
 703        case BLKPG:
 704                return compat_blkpg_ioctl(bdev, mode, cmd, compat_ptr(arg));
 705        case BLKRAGET:
 706        case BLKFRAGET:
 707                if (!arg)
 708                        return -EINVAL;
 709                bdi = blk_get_backing_dev_info(bdev);
 710                if (bdi == NULL)
 711                        return -ENOTTY;
 712                return compat_put_long(arg,
 713                                       (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
 714        case BLKROGET: /* compatible */
 715                return compat_put_int(arg, bdev_read_only(bdev) != 0);
 716        case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
 717                return compat_put_int(arg, block_size(bdev));
 718        case BLKSSZGET: /* get block device hardware sector size */
 719                return compat_put_int(arg, bdev_logical_block_size(bdev));
 720        case BLKSECTGET:
 721                return compat_put_ushort(arg,
 722                                         queue_max_sectors(bdev_get_queue(bdev)));
 723        case BLKROTATIONAL:
 724                return compat_put_ushort(arg,
 725                                         !blk_queue_nonrot(bdev_get_queue(bdev)));
 726        case BLKRASET: /* compatible, but no compat_ptr (!) */
 727        case BLKFRASET:
 728                if (!capable(CAP_SYS_ADMIN))
 729                        return -EACCES;
 730                bdi = blk_get_backing_dev_info(bdev);
 731                if (bdi == NULL)
 732                        return -ENOTTY;
 733                bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
 734                return 0;
 735        case BLKGETSIZE:
 736                size = i_size_read(bdev->bd_inode);
 737                if ((size >> 9) > ~0UL)
 738                        return -EFBIG;
 739                return compat_put_ulong(arg, size >> 9);
 740
 741        case BLKGETSIZE64_32:
 742                return compat_put_u64(arg, i_size_read(bdev->bd_inode));
 743
 744        case BLKTRACESETUP32:
 745        case BLKTRACESTART: /* compatible */
 746        case BLKTRACESTOP:  /* compatible */
 747        case BLKTRACETEARDOWN: /* compatible */
 748                ret = blk_trace_ioctl(bdev, cmd, compat_ptr(arg));
 749                return ret;
 750        default:
 751                if (disk->fops->compat_ioctl)
 752                        ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
 753                if (ret == -ENOIOCTLCMD)
 754                        ret = compat_blkdev_driver_ioctl(bdev, mode, cmd, arg);
 755                return ret;
 756        }
 757}
 758
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