compat_ioctl.c 21.6 KB
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#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));
}

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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;
}

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static int compat_hdio_ioctl(struct block_device *bdev, fmode_t mode,
		unsigned int cmd, unsigned long arg)
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{
	mm_segment_t old_fs = get_fs();
	unsigned long kval;
	unsigned int __user *uvp;
	int error;

	set_fs(KERNEL_DS);
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	error = __blkdev_driver_ioctl(bdev, mode,
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				cmd, (unsigned long)(&kval));
	set_fs(old_fs);

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

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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];
};

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static int compat_cdrom_read_audio(struct block_device *bdev, fmode_t mode,
		unsigned int cmd, unsigned long arg)
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{
	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;

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	return __blkdev_driver_ioctl(bdev, mode, cmd,
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			(unsigned long)cdread_audio);
}

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static int compat_cdrom_generic_command(struct block_device *bdev, fmode_t mode,
		unsigned int cmd, unsigned long arg)
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{
	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;

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	return __blkdev_driver_ioctl(bdev, mode, cmd, (unsigned long)cgc);
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}

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

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static int compat_blkpg_ioctl(struct block_device *bdev, fmode_t mode,
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		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;

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	return blkdev_ioctl(bdev, mode, cmd, (unsigned long)a);
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}

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

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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)

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static int compat_fd_ioctl(struct block_device *bdev, fmode_t mode,
		unsigned int cmd, unsigned long arg)
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{
	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);
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	err = __blkdev_driver_ioctl(bdev, mode, kcmd, (unsigned long)karg);
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	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;
}

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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;
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	char b[BDEVNAME_SIZE];
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	int ret;

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

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

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

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

	return 0;
}

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static int compat_blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
			unsigned cmd, unsigned long arg)
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{
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	switch (cmd) {
586 587 588 589 590 591 592 593 594 595 596
	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:
597
		return compat_hdio_ioctl(bdev, mode, cmd, arg);
598 599 600 601 602 603 604 605 606
	case FDSETPRM32:
	case FDDEFPRM32:
	case FDGETPRM32:
	case FDSETDRVPRM32:
	case FDGETDRVPRM32:
	case FDGETDRVSTAT32:
	case FDPOLLDRVSTAT32:
	case FDGETFDCSTAT32:
	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

613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679
	/*
	 * 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:
	/* 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);
680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702
	/* 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:
703 704 705 706 707 708
		break;
	default:
		/* unknown ioctl number */
		return -ENOIOCTLCMD;
	}

709
	return __blkdev_driver_ioctl(bdev, mode, cmd, arg);
710 711
}

712 713 714 715
/* 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)
716
{
717 718 719 720 721
	int ret = -ENOIOCTLCMD;
	struct inode *inode = file->f_mapping->host;
	struct block_device *bdev = inode->i_bdev;
	struct gendisk *disk = bdev->bd_disk;
	fmode_t mode = file->f_mode;
722
	struct backing_dev_info *bdi;
723 724
	loff_t size;

725 726 727 728
	/*
	 * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
	 * to updated it before every ioctl.
	 */
729
	if (file->f_flags & O_NDELAY)
730 731 732
		mode |= FMODE_NDELAY;
	else
		mode &= ~FMODE_NDELAY;
733 734

	switch (cmd) {
735 736 737 738 739 740 741 742 743 744
	case HDIO_GETGEO:
		return compat_hdio_getgeo(disk, bdev, compat_ptr(arg));
	case BLKFLSBUF:
	case BLKROSET:
	case BLKDISCARD:
	/*
	 * the ones below are implemented in blkdev_locked_ioctl,
	 * but we call blkdev_ioctl, which gets the lock for us
	 */
	case BLKRRPART:
745
		return blkdev_ioctl(bdev, mode, cmd,
746 747
				(unsigned long)compat_ptr(arg));
	case BLKBSZSET_32:
748
		return blkdev_ioctl(bdev, mode, BLKBSZSET,
749 750
				(unsigned long)compat_ptr(arg));
	case BLKPG:
751
		return compat_blkpg_ioctl(bdev, mode, cmd, compat_ptr(arg));
752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779
	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:
780 781
		size = bdev->bd_inode->i_size;
		if ((size >> 9) > ~0UL)
782
			return -EFBIG;
783
		return compat_put_ulong(arg, size >> 9);
784 785 786

	case BLKGETSIZE64_32:
		return compat_put_u64(arg, bdev->bd_inode->i_size);
787 788

	case BLKTRACESETUP32:
789 790 791 792
		lock_kernel();
		ret = compat_blk_trace_setup(bdev, compat_ptr(arg));
		unlock_kernel();
		return ret;
793 794 795
	case BLKTRACESTART: /* compatible */
	case BLKTRACESTOP:  /* compatible */
	case BLKTRACETEARDOWN: /* compatible */
796 797 798
		lock_kernel();
		ret = blk_trace_ioctl(bdev, cmd, compat_ptr(arg));
		unlock_kernel();
799
		return ret;
800 801 802 803 804 805 806
	default:
		if (disk->fops->compat_ioctl)
			ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
		if (ret == -ENOIOCTLCMD)
			ret = compat_blkdev_driver_ioctl(bdev, mode, cmd, arg);
		return ret;
	}
807
}