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compat_ioctl.c

#include <linux/blkdev.h>
#include <linux/blkpg.h>
#include <linux/blktrace_api.h>
#include <linux/cdrom.h>
#include <linux/compat.h>
#include <linux/elevator.h>
#include <linux/fd.h>
#include <linux/hdreg.h>
#include <linux/syscalls.h>
#include <linux/smp_lock.h>
#include <linux/types.h>
#include <linux/uaccess.h>

static int compat_put_ushort(unsigned long arg, unsigned short val)
{
      return put_user(val, (unsigned short __user *)compat_ptr(arg));
}

static int compat_put_int(unsigned long arg, int val)
{
      return put_user(val, (compat_int_t __user *)compat_ptr(arg));
}

static int compat_put_long(unsigned long arg, long val)
{
      return put_user(val, (compat_long_t __user *)compat_ptr(arg));
}

static int compat_put_ulong(unsigned long arg, compat_ulong_t val)
{
      return put_user(val, (compat_ulong_t __user *)compat_ptr(arg));
}

static int compat_put_u64(unsigned long arg, u64 val)
{
      return put_user(val, (compat_u64 __user *)compat_ptr(arg));
}

struct compat_hd_geometry {
      unsigned char heads;
      unsigned char sectors;
      unsigned short cylinders;
      u32 start;
};

static int compat_hdio_getgeo(struct gendisk *disk, struct block_device *bdev,
                  struct compat_hd_geometry __user *ugeo)
{
      struct hd_geometry geo;
      int ret;

      if (!ugeo)
            return -EINVAL;
      if (!disk->fops->getgeo)
            return -ENOTTY;

      /*
       * We need to set the startsect first, the driver may
       * want to override it.
       */
      geo.start = get_start_sect(bdev);
      ret = disk->fops->getgeo(bdev, &geo);
      if (ret)
            return ret;

      ret = copy_to_user(ugeo, &geo, 4);
      ret |= __put_user(geo.start, &ugeo->start);
      if (ret)
            ret = -EFAULT;

      return ret;
}

static int compat_hdio_ioctl(struct inode *inode, struct file *file,
            struct gendisk *disk, unsigned int cmd, unsigned long arg)
{
      mm_segment_t old_fs = get_fs();
      unsigned long kval;
      unsigned int __user *uvp;
      int error;

      set_fs(KERNEL_DS);
      error = blkdev_driver_ioctl(inode, file, disk,
                        cmd, (unsigned long)(&kval));
      set_fs(old_fs);

      if (error == 0) {
            uvp = compat_ptr(arg);
            if (put_user(kval, uvp))
                  error = -EFAULT;
      }
      return error;
}

struct compat_cdrom_read_audio {
      union cdrom_addr  addr;
      u8                addr_format;
      compat_int_t            nframes;
      compat_caddr_t          buf;
};

struct compat_cdrom_generic_command {
      unsigned char     cmd[CDROM_PACKET_SIZE];
      compat_caddr_t    buffer;
      compat_uint_t     buflen;
      compat_int_t      stat;
      compat_caddr_t    sense;
      unsigned char     data_direction;
      compat_int_t      quiet;
      compat_int_t      timeout;
      compat_caddr_t    reserved[1];
};

static int compat_cdrom_read_audio(struct inode *inode, struct file *file,
            struct gendisk *disk, unsigned int cmd, unsigned long arg)
{
      struct cdrom_read_audio __user *cdread_audio;
      struct compat_cdrom_read_audio __user *cdread_audio32;
      __u32 data;
      void __user *datap;

      cdread_audio = compat_alloc_user_space(sizeof(*cdread_audio));
      cdread_audio32 = compat_ptr(arg);

      if (copy_in_user(&cdread_audio->addr,
                   &cdread_audio32->addr,
                   (sizeof(*cdread_audio32) -
                    sizeof(compat_caddr_t))))
            return -EFAULT;

      if (get_user(data, &cdread_audio32->buf))
            return -EFAULT;
      datap = compat_ptr(data);
      if (put_user(datap, &cdread_audio->buf))
            return -EFAULT;

      return blkdev_driver_ioctl(inode, file, disk, cmd,
                  (unsigned long)cdread_audio);
}

static int compat_cdrom_generic_command(struct inode *inode, struct file *file,
            struct gendisk *disk, unsigned int cmd, unsigned long arg)
{
      struct cdrom_generic_command __user *cgc;
      struct compat_cdrom_generic_command __user *cgc32;
      u32 data;
      unsigned char dir;
      int itmp;

      cgc = compat_alloc_user_space(sizeof(*cgc));
      cgc32 = compat_ptr(arg);

      if (copy_in_user(&cgc->cmd, &cgc32->cmd, sizeof(cgc->cmd)) ||
          get_user(data, &cgc32->buffer) ||
          put_user(compat_ptr(data), &cgc->buffer) ||
          copy_in_user(&cgc->buflen, &cgc32->buflen,
                   (sizeof(unsigned int) + sizeof(int))) ||
          get_user(data, &cgc32->sense) ||
          put_user(compat_ptr(data), &cgc->sense) ||
          get_user(dir, &cgc32->data_direction) ||
          put_user(dir, &cgc->data_direction) ||
          get_user(itmp, &cgc32->quiet) ||
          put_user(itmp, &cgc->quiet) ||
          get_user(itmp, &cgc32->timeout) ||
          put_user(itmp, &cgc->timeout) ||
          get_user(data, &cgc32->reserved[0]) ||
          put_user(compat_ptr(data), &cgc->reserved[0]))
            return -EFAULT;

      return blkdev_driver_ioctl(inode, file, disk, cmd, (unsigned long)cgc);
}

struct compat_blkpg_ioctl_arg {
      compat_int_t op;
      compat_int_t flags;
      compat_int_t datalen;
      compat_caddr_t data;
};

static int compat_blkpg_ioctl(struct inode *inode, struct file *file,
            unsigned int cmd, struct compat_blkpg_ioctl_arg __user *ua32)
{
      struct blkpg_ioctl_arg __user *a = compat_alloc_user_space(sizeof(*a));
      compat_caddr_t udata;
      compat_int_t n;
      int err;

      err = get_user(n, &ua32->op);
      err |= put_user(n, &a->op);
      err |= get_user(n, &ua32->flags);
      err |= put_user(n, &a->flags);
      err |= get_user(n, &ua32->datalen);
      err |= put_user(n, &a->datalen);
      err |= get_user(udata, &ua32->data);
      err |= put_user(compat_ptr(udata), &a->data);
      if (err)
            return err;

      return blkdev_ioctl(inode, file, cmd, (unsigned long)a);
}

#define BLKBSZGET_32          _IOR(0x12, 112, int)
#define BLKBSZSET_32          _IOW(0x12, 113, int)
#define BLKGETSIZE64_32       _IOR(0x12, 114, int)

struct compat_floppy_struct {
      compat_uint_t     size;
      compat_uint_t     sect;
      compat_uint_t     head;
      compat_uint_t     track;
      compat_uint_t     stretch;
      unsigned char     gap;
      unsigned char     rate;
      unsigned char     spec1;
      unsigned char     fmt_gap;
      const compat_caddr_t name;
};

struct compat_floppy_drive_params {
      char        cmos;
      compat_ulong_t    max_dtr;
      compat_ulong_t    hlt;
      compat_ulong_t    hut;
      compat_ulong_t    srt;
      compat_ulong_t    spinup;
      compat_ulong_t    spindown;
      unsigned char     spindown_offset;
      unsigned char     select_delay;
      unsigned char     rps;
      unsigned char     tracks;
      compat_ulong_t    timeout;
      unsigned char     interleave_sect;
      struct floppy_max_errors max_errors;
      char        flags;
      char        read_track;
      short       autodetect[8];
      compat_int_t      checkfreq;
      compat_int_t      native_format;
};

struct compat_floppy_drive_struct {
      signed char flags;
      compat_ulong_t    spinup_date;
      compat_ulong_t    select_date;
      compat_ulong_t    first_read_date;
      short       probed_format;
      short       track;
      short       maxblock;
      short       maxtrack;
      compat_int_t      generation;
      compat_int_t      keep_data;
      compat_int_t      fd_ref;
      compat_int_t      fd_device;
      compat_int_t      last_checked;
      compat_caddr_t dmabuf;
      compat_int_t      bufblocks;
};

struct compat_floppy_fdc_state {
      compat_int_t      spec1;
      compat_int_t      spec2;
      compat_int_t      dtr;
      unsigned char     version;
      unsigned char     dor;
      compat_ulong_t    address;
      unsigned int      rawcmd:2;
      unsigned int      reset:1;
      unsigned int      need_configure:1;
      unsigned int      perp_mode:2;
      unsigned int      has_fifo:1;
      unsigned int      driver_version;
      unsigned char     track[4];
};

struct compat_floppy_write_errors {
      unsigned int      write_errors;
      compat_ulong_t    first_error_sector;
      compat_int_t      first_error_generation;
      compat_ulong_t    last_error_sector;
      compat_int_t      last_error_generation;
      compat_uint_t     badness;
};

#define FDSETPRM32 _IOW(2, 0x42, struct compat_floppy_struct)
#define FDDEFPRM32 _IOW(2, 0x43, struct compat_floppy_struct)
#define FDGETPRM32 _IOR(2, 0x04, struct compat_floppy_struct)
#define FDSETDRVPRM32 _IOW(2, 0x90, struct compat_floppy_drive_params)
#define FDGETDRVPRM32 _IOR(2, 0x11, struct compat_floppy_drive_params)
#define FDGETDRVSTAT32 _IOR(2, 0x12, struct compat_floppy_drive_struct)
#define FDPOLLDRVSTAT32 _IOR(2, 0x13, struct compat_floppy_drive_struct)
#define FDGETFDCSTAT32 _IOR(2, 0x15, struct compat_floppy_fdc_state)
#define FDWERRORGET32  _IOR(2, 0x17, struct compat_floppy_write_errors)

static struct {
      unsigned int      cmd32;
      unsigned int      cmd;
} fd_ioctl_trans_table[] = {
      { FDSETPRM32, FDSETPRM },
      { FDDEFPRM32, FDDEFPRM },
      { FDGETPRM32, FDGETPRM },
      { FDSETDRVPRM32, FDSETDRVPRM },
      { FDGETDRVPRM32, FDGETDRVPRM },
      { FDGETDRVSTAT32, FDGETDRVSTAT },
      { FDPOLLDRVSTAT32, FDPOLLDRVSTAT },
      { FDGETFDCSTAT32, FDGETFDCSTAT },
      { FDWERRORGET32, FDWERRORGET }
};

#define NR_FD_IOCTL_TRANS ARRAY_SIZE(fd_ioctl_trans_table)

static int compat_fd_ioctl(struct inode *inode, struct file *file,
            struct gendisk *disk, unsigned int cmd, unsigned long arg)
{
      mm_segment_t old_fs = get_fs();
      void *karg = NULL;
      unsigned int kcmd = 0;
      int i, err;

      for (i = 0; i < NR_FD_IOCTL_TRANS; i++)
            if (cmd == fd_ioctl_trans_table[i].cmd32) {
                  kcmd = fd_ioctl_trans_table[i].cmd;
                  break;
            }
      if (!kcmd)
            return -EINVAL;

      switch (cmd) {
      case FDSETPRM32:
      case FDDEFPRM32:
      case FDGETPRM32:
      {
            compat_uptr_t name;
            struct compat_floppy_struct __user *uf;
            struct floppy_struct *f;

            uf = compat_ptr(arg);
            f = karg = kmalloc(sizeof(struct floppy_struct), GFP_KERNEL);
            if (!karg)
                  return -ENOMEM;
            if (cmd == FDGETPRM32)
                  break;
            err = __get_user(f->size, &uf->size);
            err |= __get_user(f->sect, &uf->sect);
            err |= __get_user(f->head, &uf->head);
            err |= __get_user(f->track, &uf->track);
            err |= __get_user(f->stretch, &uf->stretch);
            err |= __get_user(f->gap, &uf->gap);
            err |= __get_user(f->rate, &uf->rate);
            err |= __get_user(f->spec1, &uf->spec1);
            err |= __get_user(f->fmt_gap, &uf->fmt_gap);
            err |= __get_user(name, &uf->name);
            f->name = compat_ptr(name);
            if (err) {
                  err = -EFAULT;
                  goto out;
            }
            break;
      }
      case FDSETDRVPRM32:
      case FDGETDRVPRM32:
      {
            struct compat_floppy_drive_params __user *uf;
            struct floppy_drive_params *f;

            uf = compat_ptr(arg);
            f = karg = kmalloc(sizeof(struct floppy_drive_params), GFP_KERNEL);
            if (!karg)
                  return -ENOMEM;
            if (cmd == FDGETDRVPRM32)
                  break;
            err = __get_user(f->cmos, &uf->cmos);
            err |= __get_user(f->max_dtr, &uf->max_dtr);
            err |= __get_user(f->hlt, &uf->hlt);
            err |= __get_user(f->hut, &uf->hut);
            err |= __get_user(f->srt, &uf->srt);
            err |= __get_user(f->spinup, &uf->spinup);
            err |= __get_user(f->spindown, &uf->spindown);
            err |= __get_user(f->spindown_offset, &uf->spindown_offset);
            err |= __get_user(f->select_delay, &uf->select_delay);
            err |= __get_user(f->rps, &uf->rps);
            err |= __get_user(f->tracks, &uf->tracks);
            err |= __get_user(f->timeout, &uf->timeout);
            err |= __get_user(f->interleave_sect, &uf->interleave_sect);
            err |= __copy_from_user(&f->max_errors, &uf->max_errors, sizeof(f->max_errors));
            err |= __get_user(f->flags, &uf->flags);
            err |= __get_user(f->read_track, &uf->read_track);
            err |= __copy_from_user(f->autodetect, uf->autodetect, sizeof(f->autodetect));
            err |= __get_user(f->checkfreq, &uf->checkfreq);
            err |= __get_user(f->native_format, &uf->native_format);
            if (err) {
                  err = -EFAULT;
                  goto out;
            }
            break;
      }
      case FDGETDRVSTAT32:
      case FDPOLLDRVSTAT32:
            karg = kmalloc(sizeof(struct floppy_drive_struct), GFP_KERNEL);
            if (!karg)
                  return -ENOMEM;
            break;
      case FDGETFDCSTAT32:
            karg = kmalloc(sizeof(struct floppy_fdc_state), GFP_KERNEL);
            if (!karg)
                  return -ENOMEM;
            break;
      case FDWERRORGET32:
            karg = kmalloc(sizeof(struct floppy_write_errors), GFP_KERNEL);
            if (!karg)
                  return -ENOMEM;
            break;
      default:
            return -EINVAL;
      }
      set_fs(KERNEL_DS);
      err = blkdev_driver_ioctl(inode, file, disk, kcmd, (unsigned long)karg);
      set_fs(old_fs);
      if (err)
            goto out;
      switch (cmd) {
      case FDGETPRM32:
      {
            struct floppy_struct *f = karg;
            struct compat_floppy_struct __user *uf = compat_ptr(arg);

            err = __put_user(f->size, &uf->size);
            err |= __put_user(f->sect, &uf->sect);
            err |= __put_user(f->head, &uf->head);
            err |= __put_user(f->track, &uf->track);
            err |= __put_user(f->stretch, &uf->stretch);
            err |= __put_user(f->gap, &uf->gap);
            err |= __put_user(f->rate, &uf->rate);
            err |= __put_user(f->spec1, &uf->spec1);
            err |= __put_user(f->fmt_gap, &uf->fmt_gap);
            err |= __put_user((u64)f->name, (compat_caddr_t __user *)&uf->name);
            break;
      }
      case FDGETDRVPRM32:
      {
            struct compat_floppy_drive_params __user *uf;
            struct floppy_drive_params *f = karg;

            uf = compat_ptr(arg);
            err = __put_user(f->cmos, &uf->cmos);
            err |= __put_user(f->max_dtr, &uf->max_dtr);
            err |= __put_user(f->hlt, &uf->hlt);
            err |= __put_user(f->hut, &uf->hut);
            err |= __put_user(f->srt, &uf->srt);
            err |= __put_user(f->spinup, &uf->spinup);
            err |= __put_user(f->spindown, &uf->spindown);
            err |= __put_user(f->spindown_offset, &uf->spindown_offset);
            err |= __put_user(f->select_delay, &uf->select_delay);
            err |= __put_user(f->rps, &uf->rps);
            err |= __put_user(f->tracks, &uf->tracks);
            err |= __put_user(f->timeout, &uf->timeout);
            err |= __put_user(f->interleave_sect, &uf->interleave_sect);
            err |= __copy_to_user(&uf->max_errors, &f->max_errors, sizeof(f->max_errors));
            err |= __put_user(f->flags, &uf->flags);
            err |= __put_user(f->read_track, &uf->read_track);
            err |= __copy_to_user(uf->autodetect, f->autodetect, sizeof(f->autodetect));
            err |= __put_user(f->checkfreq, &uf->checkfreq);
            err |= __put_user(f->native_format, &uf->native_format);
            break;
      }
      case FDGETDRVSTAT32:
      case FDPOLLDRVSTAT32:
      {
            struct compat_floppy_drive_struct __user *uf;
            struct floppy_drive_struct *f = karg;

            uf = compat_ptr(arg);
            err = __put_user(f->flags, &uf->flags);
            err |= __put_user(f->spinup_date, &uf->spinup_date);
            err |= __put_user(f->select_date, &uf->select_date);
            err |= __put_user(f->first_read_date, &uf->first_read_date);
            err |= __put_user(f->probed_format, &uf->probed_format);
            err |= __put_user(f->track, &uf->track);
            err |= __put_user(f->maxblock, &uf->maxblock);
            err |= __put_user(f->maxtrack, &uf->maxtrack);
            err |= __put_user(f->generation, &uf->generation);
            err |= __put_user(f->keep_data, &uf->keep_data);
            err |= __put_user(f->fd_ref, &uf->fd_ref);
            err |= __put_user(f->fd_device, &uf->fd_device);
            err |= __put_user(f->last_checked, &uf->last_checked);
            err |= __put_user((u64)f->dmabuf, &uf->dmabuf);
            err |= __put_user((u64)f->bufblocks, &uf->bufblocks);
            break;
      }
      case FDGETFDCSTAT32:
      {
            struct compat_floppy_fdc_state __user *uf;
            struct floppy_fdc_state *f = karg;

            uf = compat_ptr(arg);
            err = __put_user(f->spec1, &uf->spec1);
            err |= __put_user(f->spec2, &uf->spec2);
            err |= __put_user(f->dtr, &uf->dtr);
            err |= __put_user(f->version, &uf->version);
            err |= __put_user(f->dor, &uf->dor);
            err |= __put_user(f->address, &uf->address);
            err |= __copy_to_user((char __user *)&uf->address + sizeof(uf->address),
                           (char *)&f->address + sizeof(f->address), sizeof(int));
            err |= __put_user(f->driver_version, &uf->driver_version);
            err |= __copy_to_user(uf->track, f->track, sizeof(f->track));
            break;
      }
      case FDWERRORGET32:
      {
            struct compat_floppy_write_errors __user *uf;
            struct floppy_write_errors *f = karg;

            uf = compat_ptr(arg);
            err = __put_user(f->write_errors, &uf->write_errors);
            err |= __put_user(f->first_error_sector, &uf->first_error_sector);
            err |= __put_user(f->first_error_generation, &uf->first_error_generation);
            err |= __put_user(f->last_error_sector, &uf->last_error_sector);
            err |= __put_user(f->last_error_generation, &uf->last_error_generation);
            err |= __put_user(f->badness, &uf->badness);
            break;
      }
      default:
            break;
      }
      if (err)
            err = -EFAULT;

out:
      kfree(karg);
      return err;
}

struct compat_blk_user_trace_setup {
      char name[32];
      u16 act_mask;
      u32 buf_size;
      u32 buf_nr;
      compat_u64 start_lba;
      compat_u64 end_lba;
      u32 pid;
};
#define BLKTRACESETUP32 _IOWR(0x12, 115, struct compat_blk_user_trace_setup)

static int compat_blk_trace_setup(struct block_device *bdev, char __user *arg)
{
      struct blk_user_trace_setup buts;
      struct compat_blk_user_trace_setup cbuts;
      struct request_queue *q;
      int ret;

      q = bdev_get_queue(bdev);
      if (!q)
            return -ENXIO;

      if (copy_from_user(&cbuts, arg, sizeof(cbuts)))
            return -EFAULT;

      buts = (struct blk_user_trace_setup) {
            .act_mask = cbuts.act_mask,
            .buf_size = cbuts.buf_size,
            .buf_nr = cbuts.buf_nr,
            .start_lba = cbuts.start_lba,
            .end_lba = cbuts.end_lba,
            .pid = cbuts.pid,
      };
      memcpy(&buts.name, &cbuts.name, 32);

      mutex_lock(&bdev->bd_mutex);
      ret = do_blk_trace_setup(q, bdev, &buts);
      mutex_unlock(&bdev->bd_mutex);
      if (ret)
            return ret;

      if (copy_to_user(arg, &buts.name, 32))
            return -EFAULT;

      return 0;
}

static int compat_blkdev_driver_ioctl(struct inode *inode, struct file *file,
                  struct gendisk *disk, unsigned cmd, unsigned long arg)
{
      int ret;

      switch (cmd) {
      case HDIO_GET_UNMASKINTR:
      case HDIO_GET_MULTCOUNT:
      case HDIO_GET_KEEPSETTINGS:
      case HDIO_GET_32BIT:
      case HDIO_GET_NOWERR:
      case HDIO_GET_DMA:
      case HDIO_GET_NICE:
      case HDIO_GET_WCACHE:
      case HDIO_GET_ACOUSTIC:
      case HDIO_GET_ADDRESS:
      case HDIO_GET_BUSSTATE:
            return compat_hdio_ioctl(inode, file, disk, cmd, arg);
      case FDSETPRM32:
      case FDDEFPRM32:
      case FDGETPRM32:
      case FDSETDRVPRM32:
      case FDGETDRVPRM32:
      case FDGETDRVSTAT32:
      case FDPOLLDRVSTAT32:
      case FDGETFDCSTAT32:
      case FDWERRORGET32:
            return compat_fd_ioctl(inode, file, disk, cmd, arg);
      case CDROMREADAUDIO:
            return compat_cdrom_read_audio(inode, file, disk, cmd, arg);
      case CDROM_SEND_PACKET:
            return compat_cdrom_generic_command(inode, file, disk, cmd, arg);

      /*
       * No handler required for the ones below, we just need to
       * convert arg to a 64 bit pointer.
       */
      case BLKSECTSET:
      /*
       * 0x03 -- HD/IDE ioctl's used by hdparm and friends.
       *         Some need translations, these do not.
       */
      case HDIO_GET_IDENTITY:
      case HDIO_DRIVE_TASK:
      case HDIO_DRIVE_CMD:
      case HDIO_SCAN_HWIF:
      /* 0x330 is reserved -- it used to be HDIO_GETGEO_BIG */
      case 0x330:
      /* 0x02 -- Floppy ioctls */
      case FDMSGON:
      case FDMSGOFF:
      case FDSETEMSGTRESH:
      case FDFLUSH:
      case FDWERRORCLR:
      case FDSETMAXERRS:
      case FDGETMAXERRS:
      case FDGETDRVTYP:
      case FDEJECT:
      case FDCLRPRM:
      case FDFMTBEG:
      case FDFMTEND:
      case FDRESET:
      case FDTWADDLE:
      case FDFMTTRK:
      case FDRAWCMD:
      /* CDROM stuff */
      case CDROMPAUSE:
      case CDROMRESUME:
      case CDROMPLAYMSF:
      case CDROMPLAYTRKIND:
      case CDROMREADTOCHDR:
      case CDROMREADTOCENTRY:
      case CDROMSTOP:
      case CDROMSTART:
      case CDROMEJECT:
      case CDROMVOLCTRL:
      case CDROMSUBCHNL:
      case CDROMMULTISESSION:
      case CDROM_GET_MCN:
      case CDROMRESET:
      case CDROMVOLREAD:
      case CDROMSEEK:
      case CDROMPLAYBLK:
      case CDROMCLOSETRAY:
      case CDROM_DISC_STATUS:
      case CDROM_CHANGER_NSLOTS:
      case CDROM_GET_CAPABILITY:
      /* Ignore cdrom.h about these next 5 ioctls, they absolutely do
       * not take a struct cdrom_read, instead they take a struct cdrom_msf
       * which is compatible.
       */
      case CDROMREADMODE2:
      case CDROMREADMODE1:
      case CDROMREADRAW:
      case CDROMREADCOOKED:
      case CDROMREADALL:
      /* DVD ioctls */
      case DVD_READ_STRUCT:
      case DVD_WRITE_STRUCT:
      case DVD_AUTH:
            arg = (unsigned long)compat_ptr(arg);
      /* These intepret arg as an unsigned long, not as a pointer,
       * so we must not do compat_ptr() conversion. */
      case HDIO_SET_MULTCOUNT:
      case HDIO_SET_UNMASKINTR:
      case HDIO_SET_KEEPSETTINGS:
      case HDIO_SET_32BIT:
      case HDIO_SET_NOWERR:
      case HDIO_SET_DMA:
      case HDIO_SET_PIO_MODE:
      case HDIO_SET_NICE:
      case HDIO_SET_WCACHE:
      case HDIO_SET_ACOUSTIC:
      case HDIO_SET_BUSSTATE:
      case HDIO_SET_ADDRESS:
      case CDROMEJECT_SW:
      case CDROM_SET_OPTIONS:
      case CDROM_CLEAR_OPTIONS:
      case CDROM_SELECT_SPEED:
      case CDROM_SELECT_DISC:
      case CDROM_MEDIA_CHANGED:
      case CDROM_DRIVE_STATUS:
      case CDROM_LOCKDOOR:
      case CDROM_DEBUG:
            break;
      default:
            /* unknown ioctl number */
            return -ENOIOCTLCMD;
      }

      if (disk->fops->unlocked_ioctl)
            return disk->fops->unlocked_ioctl(file, cmd, arg);

      if (disk->fops->ioctl) {
            lock_kernel();
            ret = disk->fops->ioctl(inode, file, cmd, arg);
            unlock_kernel();
            return ret;
      }

      return -ENOTTY;
}

static int compat_blkdev_locked_ioctl(struct inode *inode, struct file *file,
                        struct block_device *bdev,
                        unsigned cmd, unsigned long arg)
{
      struct backing_dev_info *bdi;

      switch (cmd) {
      case BLKRAGET:
      case BLKFRAGET:
            if (!arg)
                  return -EINVAL;
            bdi = blk_get_backing_dev_info(bdev);
            if (bdi == NULL)
                  return -ENOTTY;
            return compat_put_long(arg,
                               (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
      case BLKROGET: /* compatible */
            return compat_put_int(arg, bdev_read_only(bdev) != 0);
      case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
            return compat_put_int(arg, block_size(bdev));
      case BLKSSZGET: /* get block device hardware sector size */
            return compat_put_int(arg, bdev_hardsect_size(bdev));
      case BLKSECTGET:
            return compat_put_ushort(arg,
                               bdev_get_queue(bdev)->max_sectors);
      case BLKRASET: /* compatible, but no compat_ptr (!) */
      case BLKFRASET:
            if (!capable(CAP_SYS_ADMIN))
                  return -EACCES;
            bdi = blk_get_backing_dev_info(bdev);
            if (bdi == NULL)
                  return -ENOTTY;
            bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
            return 0;
      case BLKGETSIZE:
            if ((bdev->bd_inode->i_size >> 9) > ~0UL)
                  return -EFBIG;
            return compat_put_ulong(arg, bdev->bd_inode->i_size >> 9);

      case BLKGETSIZE64_32:
            return compat_put_u64(arg, bdev->bd_inode->i_size);

      case BLKTRACESETUP32:
            return compat_blk_trace_setup(bdev, compat_ptr(arg));
      case BLKTRACESTART: /* compatible */
      case BLKTRACESTOP:  /* compatible */
      case BLKTRACETEARDOWN: /* compatible */
            return blk_trace_ioctl(bdev, cmd, compat_ptr(arg));
      }
      return -ENOIOCTLCMD;
}

/* Most of the generic ioctls are handled in the normal fallback path.
   This assumes the blkdev's low level compat_ioctl always returns
   ENOIOCTLCMD for unknown ioctls. */
long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
{
      int ret = -ENOIOCTLCMD;
      struct inode *inode = file->f_mapping->host;
      struct block_device *bdev = inode->i_bdev;
      struct gendisk *disk = bdev->bd_disk;

      switch (cmd) {
      case HDIO_GETGEO:
            return compat_hdio_getgeo(disk, bdev, compat_ptr(arg));
      case BLKFLSBUF:
      case BLKROSET:
      /*
       * the ones below are implemented in blkdev_locked_ioctl,
       * but we call blkdev_ioctl, which gets the lock for us
       */
      case BLKRRPART:
            return blkdev_ioctl(inode, file, cmd,
                        (unsigned long)compat_ptr(arg));
      case BLKBSZSET_32:
            return blkdev_ioctl(inode, file, BLKBSZSET,
                        (unsigned long)compat_ptr(arg));
      case BLKPG:
            return compat_blkpg_ioctl(inode, file, cmd, compat_ptr(arg));
      }

      lock_kernel();
      ret = compat_blkdev_locked_ioctl(inode, file, bdev, cmd, arg);
      /* FIXME: why do we assume -> compat_ioctl needs the BKL? */
      if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
            ret = disk->fops->compat_ioctl(file, cmd, arg);
      unlock_kernel();

      if (ret != -ENOIOCTLCMD)
            return ret;

      return compat_blkdev_driver_ioctl(inode, file, disk, cmd, arg);
}

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