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        /*
  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
  79static 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
 100struct 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
 107struct 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
 119static 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
 146static 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
 178struct 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
 185static 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
 211struct compat_floppy_drive_params {
 212        char            cmos;
 213        compat_ulong_t  max_dtr;
 214        compat_ulong_t  hlt;
 215        compat_ulong_t  hut;
 216        compat_ulong_t  srt;
 217        compat_ulong_t  spinup;
 218        compat_ulong_t  spindown;
 219        unsigned char   spindown_offset;
 220        unsigned char   select_delay;
 221        unsigned char   rps;
 222        unsigned char   tracks;
 223        compat_ulong_t  timeout;
 224        unsigned char   interleave_sect;
 225        struct floppy_max_errors max_errors;
 226        char            flags;
 227        char            read_track;
 228        short           autodetect[8];
 229        compat_int_t    checkfreq;
 230        compat_int_t    native_format;
 231};
 232
 233struct compat_floppy_drive_struct {
 234        signed char     flags;
 235        compat_ulong_t  spinup_date;
 236        compat_ulong_t  select_date;
 237        compat_ulong_t  first_read_date;
 238        short           probed_format;
 239        short           track;
 240        short           maxblock;
 241        short           maxtrack;
 242        compat_int_t    generation;
 243        compat_int_t    keep_data;
 244        compat_int_t    fd_ref;
 245        compat_int_t    fd_device;
 246        compat_int_t    last_checked;
 247        compat_caddr_t dmabuf;
 248        compat_int_t    bufblocks;
 249};
 250
 251struct compat_floppy_fdc_state {
 252        compat_int_t    spec1;
 253        compat_int_t    spec2;
 254        compat_int_t    dtr;
 255        unsigned char   version;
 256        unsigned char   dor;
 257        compat_ulong_t  address;
 258        unsigned int    rawcmd:2;
 259        unsigned int    reset:1;
 260        unsigned int    need_configure:1;
 261        unsigned int    perp_mode:2;
 262        unsigned int    has_fifo:1;
 263        unsigned int    driver_version;
 264        unsigned char   track[4];
 265};
 266
 267struct compat_floppy_write_errors {
 268        unsigned int    write_errors;
 269        compat_ulong_t  first_error_sector;
 270        compat_int_t    first_error_generation;
 271        compat_ulong_t  last_error_sector;
 272        compat_int_t    last_error_generation;
 273        compat_uint_t   badness;
 274};
 275
 276#define FDSETPRM32 _IOW(2, 0x42, struct compat_floppy_struct)
 277#define FDDEFPRM32 _IOW(2, 0x43, struct compat_floppy_struct)
 278#define FDSETDRVPRM32 _IOW(2, 0x90, struct compat_floppy_drive_params)
 279#define FDGETDRVPRM32 _IOR(2, 0x11, struct compat_floppy_drive_params)
 280#define FDGETDRVSTAT32 _IOR(2, 0x12, struct compat_floppy_drive_struct)
 281#define FDPOLLDRVSTAT32 _IOR(2, 0x13, struct compat_floppy_drive_struct)
 282#define FDGETFDCSTAT32 _IOR(2, 0x15, struct compat_floppy_fdc_state)
 283#define FDWERRORGET32  _IOR(2, 0x17, struct compat_floppy_write_errors)
 284
 285static struct {
 286        unsigned int    cmd32;
 287        unsigned int    cmd;
 288} fd_ioctl_trans_table[] = {
 289        { FDSETPRM32, FDSETPRM },
 290        { FDDEFPRM32, FDDEFPRM },
 291        { FDGETPRM32, FDGETPRM },
 292        { FDSETDRVPRM32, FDSETDRVPRM },
 293        { FDGETDRVPRM32, FDGETDRVPRM },
 294        { FDGETDRVSTAT32, FDGETDRVSTAT },
 295        { FDPOLLDRVSTAT32, FDPOLLDRVSTAT },
 296        { FDGETFDCSTAT32, FDGETFDCSTAT },
 297        { FDWERRORGET32, FDWERRORGET }
 298};
 299
 300#define NR_FD_IOCTL_TRANS ARRAY_SIZE(fd_ioctl_trans_table)
 301
 302static int compat_fd_ioctl(struct block_device *bdev, fmode_t mode,
 303                unsigned int cmd, unsigned long arg)
 304{
 305        mm_segment_t old_fs = get_fs();
 306        void *karg = NULL;
 307        unsigned int kcmd = 0;
 308        int i, err;
 309
 310        for (i = 0; i < NR_FD_IOCTL_TRANS; i++)
 311                if (cmd == fd_ioctl_trans_table[i].cmd32) {
 312                        kcmd = fd_ioctl_trans_table[i].cmd;
 313                        break;
 314                }
 315        if (!kcmd)
 316                return -EINVAL;
 317
 318        switch (cmd) {
 319        case FDSETPRM32:
 320        case FDDEFPRM32:
 321        case FDGETPRM32:
 322        {
 323                compat_uptr_t name;
 324                struct compat_floppy_struct __user *uf;
 325                struct floppy_struct *f;
 326
 327                uf = compat_ptr(arg);
 328                f = karg = kmalloc(sizeof(struct floppy_struct), GFP_KERNEL);
 329                if (!karg)
 330                        return -ENOMEM;
 331                if (cmd == FDGETPRM32)
 332                        break;
 333                err = __get_user(f->size, &uf->size);
 334                err |= __get_user(f->sect, &uf->sect);
 335                err |= __get_user(f->head, &uf->head);
 336                err |= __get_user(f->track, &uf->track);
 337                err |= __get_user(f->stretch, &uf->stretch);
 338                err |= __get_user(f->gap, &uf->gap);
 339                err |= __get_user(f->rate, &uf->rate);
 340                err |= __get_user(f->spec1, &uf->spec1);
 341                err |= __get_user(f->fmt_gap, &uf->fmt_gap);
 342                err |= __get_user(name, &uf->name);
 343                f->name = compat_ptr(name);
 344                if (err) {
 345                        err = -EFAULT;
 346                        goto out;
 347                }
 348                break;
 349        }
 350        case FDSETDRVPRM32:
 351        case FDGETDRVPRM32:
 352        {
 353                struct compat_floppy_drive_params __user *uf;
 354                struct floppy_drive_params *f;
 355
 356                uf = compat_ptr(arg);
 357                f = karg = kmalloc(sizeof(struct floppy_drive_params), GFP_KERNEL);
 358                if (!karg)
 359                        return -ENOMEM;
 360                if (cmd == FDGETDRVPRM32)
 361                        break;
 362                err = __get_user(f->cmos, &uf->cmos);
 363                err |= __get_user(f->max_dtr, &uf->max_dtr);
 364                err |= __get_user(f->hlt, &uf->hlt);
 365                err |= __get_user(f->hut, &uf->hut);
 366                err |= __get_user(f->srt, &uf->srt);
 367                err |= __get_user(f->spinup, &uf->spinup);
 368                err |= __get_user(f->spindown, &uf->spindown);
 369                err |= __get_user(f->spindown_offset, &uf->spindown_offset);
 370                err |= __get_user(f->select_delay, &uf->select_delay);
 371                err |= __get_user(f->rps, &uf->rps);
 372                err |= __get_user(f->tracks, &uf->tracks);
 373                err |= __get_user(f->timeout, &uf->timeout);
 374                err |= __get_user(f->interleave_sect, &uf->interleave_sect);
 375                err |= __copy_from_user(&f->max_errors, &uf->max_errors, sizeof(f->max_errors));
 376                err |= __get_user(f->flags, &uf->flags);
 377                err |= __get_user(f->read_track, &uf->read_track);
 378                err |= __copy_from_user(f->autodetect, uf->autodetect, sizeof(f->autodetect));
 379                err |= __get_user(f->checkfreq, &uf->checkfreq);
 380                err |= __get_user(f->native_format, &uf->native_format);
 381                if (err) {
 382                        err = -EFAULT;
 383                        goto out;
 384                }
 385                break;
 386        }
 387        case FDGETDRVSTAT32:
 388        case FDPOLLDRVSTAT32:
 389                karg = kmalloc(sizeof(struct floppy_drive_struct), GFP_KERNEL);
 390                if (!karg)
 391                        return -ENOMEM;
 392                break;
 393        case FDGETFDCSTAT32:
 394                karg = kmalloc(sizeof(struct floppy_fdc_state), GFP_KERNEL);
 395                if (!karg)
 396                        return -ENOMEM;
 397                break;
 398        case FDWERRORGET32:
 399                karg = kmalloc(sizeof(struct floppy_write_errors), GFP_KERNEL);
 400                if (!karg)
 401                        return -ENOMEM;
 402                break;
 403        default:
 404                return -EINVAL;
 405        }
 406        set_fs(KERNEL_DS);
 407        err = __blkdev_driver_ioctl(bdev, mode, kcmd, (unsigned long)karg);
 408        set_fs(old_fs);
 409        if (err)
 410                goto out;
 411        switch (cmd) {
 412        case FDGETPRM32:
 413        {
 414                struct floppy_struct *f = karg;
 415                struct compat_floppy_struct __user *uf = compat_ptr(arg);
 416
 417                err = __put_user(f->size, &uf->size);
 418                err |= __put_user(f->sect, &uf->sect);
 419                err |= __put_user(f->head, &uf->head);
 420                err |= __put_user(f->track, &uf->track);
 421                err |= __put_user(f->stretch, &uf->stretch);
 422                err |= __put_user(f->gap, &uf->gap);
 423                err |= __put_user(f->rate, &uf->rate);
 424                err |= __put_user(f->spec1, &uf->spec1);
 425                err |= __put_user(f->fmt_gap, &uf->fmt_gap);
 426                err |= __put_user((u64)f->name, (compat_caddr_t __user *)&uf->name);
 427                break;
 428        }
 429        case FDGETDRVPRM32:
 430        {
 431                struct compat_floppy_drive_params __user *uf;
 432                struct floppy_drive_params *f = karg;
 433
 434                uf = compat_ptr(arg);
 435                err = __put_user(f->cmos, &uf->cmos);
 436                err |= __put_user(f->max_dtr, &uf->max_dtr);
 437                err |= __put_user(f->hlt, &uf->hlt);
 438                err |= __put_user(f->hut, &uf->hut);
 439                err |= __put_user(f->srt, &uf->srt);
 440                err |= __put_user(f->spinup, &uf->spinup);
 441                err |= __put_user(f->spindown, &uf->spindown);
 442                err |= __put_user(f->spindown_offset, &uf->spindown_offset);
 443                err |= __put_user(f->select_delay, &uf->select_delay);
 444                err |= __put_user(f->rps, &uf->rps);
 445                err |= __put_user(f->tracks, &uf->tracks);
 446                err |= __put_user(f->timeout, &uf->timeout);
 447                err |= __put_user(f->interleave_sect, &uf->interleave_sect);
 448                err |= __copy_to_user(&uf->max_errors, &f->max_errors, sizeof(f->max_errors));
 449                err |= __put_user(f->flags, &uf->flags);
 450                err |= __put_user(f->read_track, &uf->read_track);
 451                err |= __copy_to_user(uf->autodetect, f->autodetect, sizeof(f->autodetect));
 452                err |= __put_user(f->checkfreq, &uf->checkfreq);
 453                err |= __put_user(f->native_format, &uf->native_format);
 454                break;
 455        }
 456        case FDGETDRVSTAT32:
 457        case FDPOLLDRVSTAT32:
 458        {
 459                struct compat_floppy_drive_struct __user *uf;
 460                struct floppy_drive_struct *f = karg;
 461
 462                uf = compat_ptr(arg);
 463                err = __put_user(f->flags, &uf->flags);
 464                err |= __put_user(f->spinup_date, &uf->spinup_date);
 465                err |= __put_user(f->select_date, &uf->select_date);
 466                err |= __put_user(f->first_read_date, &uf->first_read_date);
 467                err |= __put_user(f->probed_format, &uf->probed_format);
 468                err |= __put_user(f->track, &uf->track);
 469                err |= __put_user(f->maxblock, &uf->maxblock);
 470                err |= __put_user(f->maxtrack, &uf->maxtrack);
 471                err |= __put_user(f->generation, &uf->generation);
 472                err |= __put_user(f->keep_data, &uf->keep_data);
 473                err |= __put_user(f->fd_ref, &uf->fd_ref);
 474                err |= __put_user(f->fd_device, &uf->fd_device);
 475                err |= __put_user(f->last_checked, &uf->last_checked);
 476                err |= __put_user((u64)f->dmabuf, &uf->dmabuf);
 477                err |= __put_user((u64)f->bufblocks, &uf->bufblocks);
 478                break;
 479        }
 480        case FDGETFDCSTAT32:
 481        {
 482                struct compat_floppy_fdc_state __user *uf;
 483                struct floppy_fdc_state *f = karg;
 484
 485                uf = compat_ptr(arg);
 486                err = __put_user(f->spec1, &uf->spec1);
 487                err |= __put_user(f->spec2, &uf->spec2);
 488                err |= __put_user(f->dtr, &uf->dtr);
 489                err |= __put_user(f->version, &uf->version);
 490                err |= __put_user(f->dor, &uf->dor);
 491                err |= __put_user(f->address, &uf->address);
 492                err |= __copy_to_user((char __user *)&uf->address + sizeof(uf->address),
 493                                   (char *)&f->address + sizeof(f->address), sizeof(int));
 494                err |= __put_user(f->driver_version, &uf->driver_version);
 495                err |= __copy_to_user(uf->track, f->track, sizeof(f->track));
 496                break;
 497        }
 498        case FDWERRORGET32:
 499        {
 500                struct compat_floppy_write_errors __user *uf;
 501                struct floppy_write_errors *f = karg;
 502
 503                uf = compat_ptr(arg);
 504                err = __put_user(f->write_errors, &uf->write_errors);
 505                err |= __put_user(f->first_error_sector, &uf->first_error_sector);
 506                err |= __put_user(f->first_error_generation, &uf->first_error_generation);
 507                err |= __put_user(f->last_error_sector, &uf->last_error_sector);
 508                err |= __put_user(f->last_error_generation, &uf->last_error_generation);
 509                err |= __put_user(f->badness, &uf->badness);
 510                break;
 511        }
 512        default:
 513                break;
 514        }
 515        if (err)
 516                err = -EFAULT;
 517
 518out:
 519        kfree(karg);
 520        return err;
 521}
 522
 523static int compat_blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
 524                        unsigned cmd, unsigned long arg)
 525{
 526        switch (cmd) {
 527        case HDIO_GET_UNMASKINTR:
 528        case HDIO_GET_MULTCOUNT:
 529        case HDIO_GET_KEEPSETTINGS:
 530        case HDIO_GET_32BIT:
 531        case HDIO_GET_NOWERR:
 532        case HDIO_GET_DMA:
 533        case HDIO_GET_NICE:
 534        case HDIO_GET_WCACHE:
 535        case HDIO_GET_ACOUSTIC:
 536        case HDIO_GET_ADDRESS:
 537        case HDIO_GET_BUSSTATE:
 538                return compat_hdio_ioctl(bdev, mode, cmd, arg);
 539        case FDSETPRM32:
 540        case FDDEFPRM32:
 541        case FDGETPRM32:
 542        case FDSETDRVPRM32:
 543        case FDGETDRVPRM32:
 544        case FDGETDRVSTAT32:
 545        case FDPOLLDRVSTAT32:
 546        case FDGETFDCSTAT32:
 547        case FDWERRORGET32:
 548                return compat_fd_ioctl(bdev, mode, cmd, arg);
 549        case CDROMREADAUDIO:
 550                return compat_cdrom_read_audio(bdev, mode, cmd, arg);
 551        case CDROM_SEND_PACKET:
 552                return compat_cdrom_generic_command(bdev, mode, cmd, arg);
 553
 554        /*
 555         * No handler required for the ones below, we just need to
 556         * convert arg to a 64 bit pointer.
 557         */
 558        case BLKSECTSET:
 559        /*
 560         * 0x03 -- HD/IDE ioctl's used by hdparm and friends.
 561         *         Some need translations, these do not.
 562         */
 563        case HDIO_GET_IDENTITY:
 564        case HDIO_DRIVE_TASK:
 565        case HDIO_DRIVE_CMD:
 566        /* 0x330 is reserved -- it used to be HDIO_GETGEO_BIG */
 567        case 0x330:
 568        /* 0x02 -- Floppy ioctls */
 569        case FDMSGON:
 570        case FDMSGOFF:
 571        case FDSETEMSGTRESH:
 572        case FDFLUSH:
 573        case FDWERRORCLR:
 574        case FDSETMAXERRS:
 575        case FDGETMAXERRS:
 576        case FDGETDRVTYP:
 577        case FDEJECT:
 578        case FDCLRPRM:
 579        case FDFMTBEG:
 580        case FDFMTEND:
 581        case FDRESET:
 582        case FDTWADDLE:
 583        case FDFMTTRK:
 584        case FDRAWCMD:
 585        /* CDROM stuff */
 586        case CDROMPAUSE:
 587        case CDROMRESUME:
 588        case CDROMPLAYMSF:
 589        case CDROMPLAYTRKIND:
 590        case CDROMREADTOCHDR:
 591        case CDROMREADTOCENTRY:
 592        case CDROMSTOP:
 593        case CDROMSTART:
 594        case CDROMEJECT:
 595        case CDROMVOLCTRL:
 596        case CDROMSUBCHNL:
 597        case CDROMMULTISESSION:
 598        case CDROM_GET_MCN:
 599        case CDROMRESET:
 600        case CDROMVOLREAD:
 601        case CDROMSEEK:
 602        case CDROMPLAYBLK:
 603        case CDROMCLOSETRAY:
 604        case CDROM_DISC_STATUS:
 605        case CDROM_CHANGER_NSLOTS:
 606        case CDROM_GET_CAPABILITY:
 607        /* Ignore cdrom.h about these next 5 ioctls, they absolutely do
 608         * not take a struct cdrom_read, instead they take a struct cdrom_msf
 609         * which is compatible.
 610         */
 611        case CDROMREADMODE2:
 612        case CDROMREADMODE1:
 613        case CDROMREADRAW:
 614        case CDROMREADCOOKED:
 615        case CDROMREADALL:
 616        /* DVD ioctls */
 617        case DVD_READ_STRUCT:
 618        case DVD_WRITE_STRUCT:
 619        case DVD_AUTH:
 620                arg = (unsigned long)compat_ptr(arg);
 621        /* These intepret arg as an unsigned long, not as a pointer,
 622         * so we must not do compat_ptr() conversion. */
 623        case HDIO_SET_MULTCOUNT:
 624        case HDIO_SET_UNMASKINTR:
 625        case HDIO_SET_KEEPSETTINGS:
 626        case HDIO_SET_32BIT:
 627        case HDIO_SET_NOWERR:
 628        case HDIO_SET_DMA:
 629        case HDIO_SET_PIO_MODE:
 630        case HDIO_SET_NICE:
 631        case HDIO_SET_WCACHE:
 632        case HDIO_SET_ACOUSTIC:
 633        case HDIO_SET_BUSSTATE:
 634        case HDIO_SET_ADDRESS:
 635        case CDROMEJECT_SW:
 636        case CDROM_SET_OPTIONS:
 637        case CDROM_CLEAR_OPTIONS:
 638        case CDROM_SELECT_SPEED:
 639        case CDROM_SELECT_DISC:
 640        case CDROM_MEDIA_CHANGED:
 641        case CDROM_DRIVE_STATUS:
 642        case CDROM_LOCKDOOR:
 643        case CDROM_DEBUG:
 644                break;
 645        default:
 646                /* unknown ioctl number */
 647                return -ENOIOCTLCMD;
 648        }
 649
 650        return __blkdev_driver_ioctl(bdev, mode, cmd, arg);
 651}
 652
 653/* Most of the generic ioctls are handled in the normal fallback path.
 654   This assumes the blkdev's low level compat_ioctl always returns
 655   ENOIOCTLCMD for unknown ioctls. */
 656long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 657{
 658        int ret = -ENOIOCTLCMD;
 659        struct inode *inode = file->f_mapping->host;
 660        struct block_device *bdev = inode->i_bdev;
 661        struct gendisk *disk = bdev->bd_disk;
 662        fmode_t mode = file->f_mode;
 663        struct backing_dev_info *bdi;
 664        loff_t size;
 665
 666        /*
 667         * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
 668         * to updated it before every ioctl.
 669         */
 670        if (file->f_flags & O_NDELAY)
 671                mode |= FMODE_NDELAY;
 672        else
 673                mode &= ~FMODE_NDELAY;
 674
 675        switch (cmd) {
 676        case HDIO_GETGEO:
 677                return compat_hdio_getgeo(disk, bdev, compat_ptr(arg));
 678        case BLKPBSZGET:
 679                return compat_put_uint(arg, bdev_physical_block_size(bdev));
 680        case BLKIOMIN:
 681                return compat_put_uint(arg, bdev_io_min(bdev));
 682        case BLKIOOPT:
 683                return compat_put_uint(arg, bdev_io_opt(bdev));
 684        case BLKALIGNOFF:
 685                return compat_put_int(arg, bdev_alignment_offset(bdev));
 686        case BLKDISCARDZEROES:
 687                return compat_put_uint(arg, bdev_discard_zeroes_data(bdev));
 688        case BLKFLSBUF:
 689        case BLKROSET:
 690        case BLKDISCARD:
 691        case BLKSECDISCARD:
 692        /*
 693         * the ones below are implemented in blkdev_locked_ioctl,
 694         * but we call blkdev_ioctl, which gets the lock for us
 695         */
 696        case BLKRRPART:
 697                return blkdev_ioctl(bdev, mode, cmd,
 698                                (unsigned long)compat_ptr(arg));
 699        case BLKBSZSET_32:
 700                return blkdev_ioctl(bdev, mode, BLKBSZSET,
 701                                (unsigned long)compat_ptr(arg));
 702        case BLKPG:
 703                return compat_blkpg_ioctl(bdev, mode, cmd, compat_ptr(arg));
 704        case BLKRAGET:
 705        case BLKFRAGET:
 706                if (!arg)
 707                        return -EINVAL;
 708                bdi = blk_get_backing_dev_info(bdev);
 709                if (bdi == NULL)
 710                        return -ENOTTY;
 711                return compat_put_long(arg,
 712                                       (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
 713        case BLKROGET: /* compatible */
 714                return compat_put_int(arg, bdev_read_only(bdev) != 0);
 715        case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
 716                return compat_put_int(arg, block_size(bdev));
 717        case BLKSSZGET: /* get block device hardware sector size */
 718                return compat_put_int(arg, bdev_logical_block_size(bdev));
 719        case BLKSECTGET:
 720                return compat_put_ushort(arg,
 721                                         queue_max_sectors(bdev_get_queue(bdev)));
 722        case BLKROTATIONAL:
 723                return compat_put_ushort(arg,
 724                                         !blk_queue_nonrot(bdev_get_queue(bdev)));
 725        case BLKRASET: /* compatible, but no compat_ptr (!) */
 726        case BLKFRASET:
 727                if (!capable(CAP_SYS_ADMIN))
 728                        return -EACCES;
 729                bdi = blk_get_backing_dev_info(bdev);
 730                if (bdi == NULL)
 731                        return -ENOTTY;
 732                bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
 733                return 0;
 734        case BLKGETSIZE:
 735                size = i_size_read(bdev->bd_inode);
 736                if ((size >> 9) > ~0UL)
 737                        return -EFBIG;
 738                return compat_put_ulong(arg, size >> 9);
 739
 740        case BLKGETSIZE64_32:
 741                return compat_put_u64(arg, i_size_read(bdev->bd_inode));
 742
 743        case BLKTRACESETUP32:
 744        case BLKTRACESTART: /* compatible */
 745        case BLKTRACESTOP:  /* compatible */
 746        case BLKTRACETEARDOWN: /* compatible */
 747                ret = blk_trace_ioctl(bdev, cmd, compat_ptr(arg));
 748                return ret;
 749        default:
 750                if (disk->fops->compat_ioctl)
 751                        ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
 752                if (ret == -ENOIOCTLCMD)
 753                        ret = compat_blkdev_driver_ioctl(bdev, mode, cmd, arg);
 754                return ret;
 755        }
 756}
 757
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