block/compat_ioctl.c - kernel/msm-5.4 - Gitiles

 #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/hdreg.h>
 #include <linux/slab.h>
 #include <linux/syscalls.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_uint(unsigned long arg, unsigned int val)
 {
 	return put_user(val, (compat_uint_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;

 	memset(&geo, 0, sizeof(geo));
 	/*
 	 * 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 block_device *bdev, fmode_t mode,
 		unsigned int cmd, unsigned long arg)
 {
 	unsigned long *__user p;
 	int error;

 	p = compat_alloc_user_space(sizeof(unsigned long));
 	error = __blkdev_driver_ioctl(bdev, mode,
 				cmd, (unsigned long)p);
 	if (error == 0) {
 		unsigned int __user *uvp = compat_ptr(arg);
 		unsigned long v;
 		if (get_user(v, p) || put_user(v, 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 block_device *bdev, fmode_t mode,
 		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(bdev, mode, cmd,
 			(unsigned long)cdread_audio);
 }

 static int compat_cdrom_generic_command(struct block_device *bdev, fmode_t mode,
 		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(bdev, mode, 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 block_device *bdev, fmode_t mode,
 		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(bdev, mode, 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)

 static int compat_blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
 			unsigned cmd, unsigned long arg)
 {
 	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(bdev, mode, cmd, arg);
 	case CDROMREADAUDIO:
 		return compat_cdrom_read_audio(bdev, mode, cmd, arg);
 	case CDROM_SEND_PACKET:
 		return compat_cdrom_generic_command(bdev, mode, 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:
 	/* 0x330 is reserved -- it used to be HDIO_GETGEO_BIG */
 	case 0x330:
 	/* 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;
 	}

 	return __blkdev_driver_ioctl(bdev, mode, cmd, arg);
 }

 /* 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;
 	fmode_t mode = file->f_mode;
 	loff_t size;
 	unsigned int max_sectors;

 	/*
 	 * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
 	 * to updated it before every ioctl.
 	 */
 	if (file->f_flags & O_NDELAY)
 		mode |= FMODE_NDELAY;
 	else
 		mode &= ~FMODE_NDELAY;

 	switch (cmd) {
 	case HDIO_GETGEO:
 		return compat_hdio_getgeo(disk, bdev, compat_ptr(arg));
 	case BLKPBSZGET:
 		return compat_put_uint(arg, bdev_physical_block_size(bdev));
 	case BLKIOMIN:
 		return compat_put_uint(arg, bdev_io_min(bdev));
 	case BLKIOOPT:
 		return compat_put_uint(arg, bdev_io_opt(bdev));
 	case BLKALIGNOFF:
 		return compat_put_int(arg, bdev_alignment_offset(bdev));
 	case BLKDISCARDZEROES:
 		return compat_put_uint(arg, 0);
 	case BLKFLSBUF:
 	case BLKROSET:
 	case BLKDISCARD:
 	case BLKSECDISCARD:
 	case BLKZEROOUT:
 	/*
 	 * 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(bdev, mode, cmd,
 				(unsigned long)compat_ptr(arg));
 	case BLKBSZSET_32:
 		return blkdev_ioctl(bdev, mode, BLKBSZSET,
 				(unsigned long)compat_ptr(arg));
 	case BLKPG:
 		return compat_blkpg_ioctl(bdev, mode, cmd, compat_ptr(arg));
 	case BLKRAGET:
 	case BLKFRAGET:
 		if (!arg)
 			return -EINVAL;
 		return compat_put_long(arg,
 			       (bdev->bd_bdi->ra_pages * PAGE_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_logical_block_size(bdev));
 	case BLKSECTGET:
 		max_sectors = min_t(unsigned int, USHRT_MAX,
 				    queue_max_sectors(bdev_get_queue(bdev)));
 		return compat_put_ushort(arg, max_sectors);
 	case BLKROTATIONAL:
 		return compat_put_ushort(arg,
 					 !blk_queue_nonrot(bdev_get_queue(bdev)));
 	case BLKRASET: /* compatible, but no compat_ptr (!) */
 	case BLKFRASET:
 		if (!capable(CAP_SYS_ADMIN))
 			return -EACCES;
 		bdev->bd_bdi->ra_pages = (arg * 512) / PAGE_SIZE;
 		return 0;
 	case BLKGETSIZE:
 		size = i_size_read(bdev->bd_inode);
 		if ((size >> 9) > ~0UL)
 			return -EFBIG;
 		return compat_put_ulong(arg, size >> 9);

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

 	case BLKTRACESETUP32:
 	case BLKTRACESTART: /* compatible */
 	case BLKTRACESTOP:  /* compatible */
 	case BLKTRACETEARDOWN: /* compatible */
 		ret = blk_trace_ioctl(bdev, cmd, compat_ptr(arg));
 		return ret;
 	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;
 	}
 }
	#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/hdreg.h>
	#include <linux/slab.h>
	#include <linux/syscalls.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_uint(unsigned long arg, unsigned int val)
	{
	return put_user(val, (compat_uint_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;

	memset(&geo, 0, sizeof(geo));
	/*
	* 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 block_device *bdev, fmode_t mode,
	unsigned int cmd, unsigned long arg)
	{
	unsigned long *__user p;
	int error;

	p = compat_alloc_user_space(sizeof(unsigned long));
	error = __blkdev_driver_ioctl(bdev, mode,
	cmd, (unsigned long)p);
	if (error == 0) {
	unsigned int __user *uvp = compat_ptr(arg);
	unsigned long v;
	if (get_user(v, p) \|\| put_user(v, 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 block_device *bdev, fmode_t mode,
	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(bdev, mode, cmd,
	(unsigned long)cdread_audio);
	}

	static int compat_cdrom_generic_command(struct block_device *bdev, fmode_t mode,
	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(bdev, mode, 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 block_device *bdev, fmode_t mode,
	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(bdev, mode, 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)

	static int compat_blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
	unsigned cmd, unsigned long arg)
	{
	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(bdev, mode, cmd, arg);
	case CDROMREADAUDIO:
	return compat_cdrom_read_audio(bdev, mode, cmd, arg);
	case CDROM_SEND_PACKET:
	return compat_cdrom_generic_command(bdev, mode, 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:
	/* 0x330 is reserved -- it used to be HDIO_GETGEO_BIG */
	case 0x330:
	/* 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;
	}

	return __blkdev_driver_ioctl(bdev, mode, cmd, arg);
	}

	/* 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;
	fmode_t mode = file->f_mode;
	loff_t size;
	unsigned int max_sectors;

	/*
	* O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
	* to updated it before every ioctl.
	*/
	if (file->f_flags & O_NDELAY)
	mode \|= FMODE_NDELAY;
	else
	mode &= ~FMODE_NDELAY;

	switch (cmd) {
	case HDIO_GETGEO:
	return compat_hdio_getgeo(disk, bdev, compat_ptr(arg));
	case BLKPBSZGET:
	return compat_put_uint(arg, bdev_physical_block_size(bdev));
	case BLKIOMIN:
	return compat_put_uint(arg, bdev_io_min(bdev));
	case BLKIOOPT:
	return compat_put_uint(arg, bdev_io_opt(bdev));
	case BLKALIGNOFF:
	return compat_put_int(arg, bdev_alignment_offset(bdev));
	case BLKDISCARDZEROES:
	return compat_put_uint(arg, 0);
	case BLKFLSBUF:
	case BLKROSET:
	case BLKDISCARD:
	case BLKSECDISCARD:
	case BLKZEROOUT:
	/*
	* 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(bdev, mode, cmd,
	(unsigned long)compat_ptr(arg));
	case BLKBSZSET_32:
	return blkdev_ioctl(bdev, mode, BLKBSZSET,
	(unsigned long)compat_ptr(arg));
	case BLKPG:
	return compat_blkpg_ioctl(bdev, mode, cmd, compat_ptr(arg));
	case BLKRAGET:
	case BLKFRAGET:
	if (!arg)
	return -EINVAL;
	return compat_put_long(arg,
	(bdev->bd_bdi->ra_pages * PAGE_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_logical_block_size(bdev));
	case BLKSECTGET:
	max_sectors = min_t(unsigned int, USHRT_MAX,
	queue_max_sectors(bdev_get_queue(bdev)));
	return compat_put_ushort(arg, max_sectors);
	case BLKROTATIONAL:
	return compat_put_ushort(arg,
	!blk_queue_nonrot(bdev_get_queue(bdev)));
	case BLKRASET: /* compatible, but no compat_ptr (!) */
	case BLKFRASET:
	if (!capable(CAP_SYS_ADMIN))
	return -EACCES;
	bdev->bd_bdi->ra_pages = (arg * 512) / PAGE_SIZE;
	return 0;
	case BLKGETSIZE:
	size = i_size_read(bdev->bd_inode);
	if ((size >> 9) > ~0UL)
	return -EFBIG;
	return compat_put_ulong(arg, size >> 9);

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

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