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