[mirror_ubuntu-artful-kernel.git] / block / 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/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;
	}
}
Commit	Line	Data
f58c4c0a AB	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>
f58c4c0a	7	#include <linux/hdreg.h>
5a0e3ad6	8	#include <linux/slab.h>
f58c4c0a	9	#include <linux/syscalls.h>
f58c4c0a AB	10	#include <linux/types.h>
	11	#include <linux/uaccess.h>
	12
	13	static int compat_put_ushort(unsigned long arg, unsigned short val)
	14	{
	15	return put_user(val, (unsigned short __user *)compat_ptr(arg));
	16	}
	17
	18	static int compat_put_int(unsigned long arg, int val)
	19	{
	20	return put_user(val, (compat_int_t __user *)compat_ptr(arg));
	21	}
	22
ac481c20 MP	23	static int compat_put_uint(unsigned long arg, unsigned int val)
	24	{
	25	return put_user(val, (compat_uint_t __user *)compat_ptr(arg));
	26	}
	27
f58c4c0a AB	28	static int compat_put_long(unsigned long arg, long val)
	29	{
	30	return put_user(val, (compat_long_t __user *)compat_ptr(arg));
	31	}
	32
	33	static int compat_put_ulong(unsigned long arg, compat_ulong_t val)
	34	{
	35	return put_user(val, (compat_ulong_t __user *)compat_ptr(arg));
	36	}
	37
	38	static int compat_put_u64(unsigned long arg, u64 val)
	39	{
	40	return put_user(val, (compat_u64 __user *)compat_ptr(arg));
	41	}
	42
9617db08 AB	43	struct compat_hd_geometry {
	44	unsigned char heads;
	45	unsigned char sectors;
	46	unsigned short cylinders;
	47	u32 start;
	48	};
	49
	50	static int compat_hdio_getgeo(struct gendisk disk, struct block_device bdev,
	51	struct compat_hd_geometry __user *ugeo)
	52	{
	53	struct hd_geometry geo;
	54	int ret;
	55
	56	if (!ugeo)
	57	return -EINVAL;
	58	if (!disk->fops->getgeo)
	59	return -ENOTTY;
	60
8b0d77f1	61	memset(&geo, 0, sizeof(geo));
9617db08 AB	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);
3ddc5b46	72	ret \|= put_user(geo.start, &ugeo->start);
9617db08 AB	73	if (ret)
	74	ret = -EFAULT;
	75
	76	return ret;
	77	}
	78
33c2dca4 AV	79	static int compat_hdio_ioctl(struct block_device *bdev, fmode_t mode,
33c2dca4 AV	80	unsigned int cmd, unsigned long arg)
9617db08	81	{
30138384	82	unsigned long *__user p;
9617db08 AB	83	int error;
9617db08 AB	84
30138384	85	p = compat_alloc_user_space(sizeof(unsigned long));
33c2dca4	86	error = __blkdev_driver_ioctl(bdev, mode,
30138384	87	cmd, (unsigned long)p);
9617db08	88	if (error == 0) {
30138384 AV	89	unsigned int __user *uvp = compat_ptr(arg);
	90	unsigned long v;
	91	if (get_user(v, p) \|\| put_user(v, uvp))
9617db08 AB	92	error = -EFAULT;
	93	}
	94	return error;
	95	}
	96
b3087cc4 AB	97	struct compat_cdrom_read_audio {
	98	union cdrom_addr addr;
	99	u8 addr_format;
	100	compat_int_t nframes;
	101	compat_caddr_t buf;
	102	};
	103
	104	struct compat_cdrom_generic_command {
	105	unsigned char cmd[CDROM_PACKET_SIZE];
	106	compat_caddr_t buffer;
	107	compat_uint_t buflen;
	108	compat_int_t stat;
	109	compat_caddr_t sense;
	110	unsigned char data_direction;
	111	compat_int_t quiet;
	112	compat_int_t timeout;
	113	compat_caddr_t reserved[1];
	114	};
	115
33c2dca4 AV	116	static int compat_cdrom_read_audio(struct block_device *bdev, fmode_t mode,
33c2dca4 AV	117	unsigned int cmd, unsigned long arg)
b3087cc4 AB	118	{
	119	struct cdrom_read_audio __user *cdread_audio;
	120	struct compat_cdrom_read_audio __user *cdread_audio32;
	121	__u32 data;
	122	void __user *datap;
	123
	124	cdread_audio = compat_alloc_user_space(sizeof(*cdread_audio));
	125	cdread_audio32 = compat_ptr(arg);
	126
	127	if (copy_in_user(&cdread_audio->addr,
	128	&cdread_audio32->addr,
	129	(sizeof(*cdread_audio32) -
	130	sizeof(compat_caddr_t))))
	131	return -EFAULT;
	132
	133	if (get_user(data, &cdread_audio32->buf))
	134	return -EFAULT;
	135	datap = compat_ptr(data);
	136	if (put_user(datap, &cdread_audio->buf))
	137	return -EFAULT;
	138
33c2dca4	139	return __blkdev_driver_ioctl(bdev, mode, cmd,
b3087cc4 AB	140	(unsigned long)cdread_audio);
	141	}
	142
33c2dca4 AV	143	static int compat_cdrom_generic_command(struct block_device *bdev, fmode_t mode,
33c2dca4 AV	144	unsigned int cmd, unsigned long arg)
b3087cc4 AB	145	{
	146	struct cdrom_generic_command __user *cgc;
	147	struct compat_cdrom_generic_command __user *cgc32;
	148	u32 data;
	149	unsigned char dir;
	150	int itmp;
	151
	152	cgc = compat_alloc_user_space(sizeof(*cgc));
	153	cgc32 = compat_ptr(arg);
	154
	155	if (copy_in_user(&cgc->cmd, &cgc32->cmd, sizeof(cgc->cmd)) \|\|
	156	get_user(data, &cgc32->buffer) \|\|
	157	put_user(compat_ptr(data), &cgc->buffer) \|\|
	158	copy_in_user(&cgc->buflen, &cgc32->buflen,
	159	(sizeof(unsigned int) + sizeof(int))) \|\|
	160	get_user(data, &cgc32->sense) \|\|
	161	put_user(compat_ptr(data), &cgc->sense) \|\|
	162	get_user(dir, &cgc32->data_direction) \|\|
	163	put_user(dir, &cgc->data_direction) \|\|
	164	get_user(itmp, &cgc32->quiet) \|\|
	165	put_user(itmp, &cgc->quiet) \|\|
	166	get_user(itmp, &cgc32->timeout) \|\|
	167	put_user(itmp, &cgc->timeout) \|\|
	168	get_user(data, &cgc32->reserved[0]) \|\|
	169	put_user(compat_ptr(data), &cgc->reserved[0]))
	170	return -EFAULT;
	171
33c2dca4	172	return __blkdev_driver_ioctl(bdev, mode, cmd, (unsigned long)cgc);
b3087cc4 AB	173	}
b3087cc4 AB	174
18cf7f87 AB	175	struct compat_blkpg_ioctl_arg {
	176	compat_int_t op;
	177	compat_int_t flags;
	178	compat_int_t datalen;
	179	compat_caddr_t data;
	180	};
	181
56b26add	182	static int compat_blkpg_ioctl(struct block_device *bdev, fmode_t mode,
18cf7f87 AB	183	unsigned int cmd, struct compat_blkpg_ioctl_arg __user *ua32)
	184	{
	185	struct blkpg_ioctl_arg __user a = compat_alloc_user_space(sizeof(a));
	186	compat_caddr_t udata;
	187	compat_int_t n;
	188	int err;
	189
	190	err = get_user(n, &ua32->op);
	191	err \|= put_user(n, &a->op);
	192	err \|= get_user(n, &ua32->flags);
	193	err \|= put_user(n, &a->flags);
	194	err \|= get_user(n, &ua32->datalen);
	195	err \|= put_user(n, &a->datalen);
	196	err \|= get_user(udata, &ua32->data);
	197	err \|= put_user(compat_ptr(udata), &a->data);
	198	if (err)
	199	return err;
	200
56b26add	201	return blkdev_ioctl(bdev, mode, cmd, (unsigned long)a);
18cf7f87 AB	202	}
18cf7f87 AB	203
f58c4c0a AB	204	#define BLKBSZGET_32 _IOR(0x12, 112, int)
	205	#define BLKBSZSET_32 _IOW(0x12, 113, int)
	206	#define BLKGETSIZE64_32 _IOR(0x12, 114, int)
	207
33c2dca4 AV	208	static int compat_blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
33c2dca4 AV	209	unsigned cmd, unsigned long arg)
7199d4cd	210	{
33013a88	211	switch (cmd) {
9617db08 AB	212	case HDIO_GET_UNMASKINTR:
	213	case HDIO_GET_MULTCOUNT:
	214	case HDIO_GET_KEEPSETTINGS:
	215	case HDIO_GET_32BIT:
	216	case HDIO_GET_NOWERR:
	217	case HDIO_GET_DMA:
	218	case HDIO_GET_NICE:
	219	case HDIO_GET_WCACHE:
	220	case HDIO_GET_ACOUSTIC:
	221	case HDIO_GET_ADDRESS:
	222	case HDIO_GET_BUSSTATE:
33c2dca4	223	return compat_hdio_ioctl(bdev, mode, cmd, arg);
b3087cc4	224	case CDROMREADAUDIO:
33c2dca4	225	return compat_cdrom_read_audio(bdev, mode, cmd, arg);
b3087cc4	226	case CDROM_SEND_PACKET:
33c2dca4	227	return compat_cdrom_generic_command(bdev, mode, cmd, arg);
b3087cc4	228
7199d4cd AB	229	/*
	230	* No handler required for the ones below, we just need to
	231	* convert arg to a 64 bit pointer.
	232	*/
	233	case BLKSECTSET:
	234	/*
	235	* 0x03 -- HD/IDE ioctl's used by hdparm and friends.
	236	* Some need translations, these do not.
	237	*/
	238	case HDIO_GET_IDENTITY:
	239	case HDIO_DRIVE_TASK:
	240	case HDIO_DRIVE_CMD:
7199d4cd AB	241	/* 0x330 is reserved -- it used to be HDIO_GETGEO_BIG */
7199d4cd AB	242	case 0x330:
7199d4cd AB	243	/* CDROM stuff */
	244	case CDROMPAUSE:
	245	case CDROMRESUME:
	246	case CDROMPLAYMSF:
	247	case CDROMPLAYTRKIND:
	248	case CDROMREADTOCHDR:
	249	case CDROMREADTOCENTRY:
	250	case CDROMSTOP:
	251	case CDROMSTART:
	252	case CDROMEJECT:
	253	case CDROMVOLCTRL:
	254	case CDROMSUBCHNL:
	255	case CDROMMULTISESSION:
	256	case CDROM_GET_MCN:
	257	case CDROMRESET:
	258	case CDROMVOLREAD:
	259	case CDROMSEEK:
	260	case CDROMPLAYBLK:
	261	case CDROMCLOSETRAY:
	262	case CDROM_DISC_STATUS:
	263	case CDROM_CHANGER_NSLOTS:
	264	case CDROM_GET_CAPABILITY:
	265	/* Ignore cdrom.h about these next 5 ioctls, they absolutely do
	266	* not take a struct cdrom_read, instead they take a struct cdrom_msf
	267	* which is compatible.
	268	*/
	269	case CDROMREADMODE2:
	270	case CDROMREADMODE1:
	271	case CDROMREADRAW:
	272	case CDROMREADCOOKED:
	273	case CDROMREADALL:
	274	/* DVD ioctls */
	275	case DVD_READ_STRUCT:
	276	case DVD_WRITE_STRUCT:
	277	case DVD_AUTH:
	278	arg = (unsigned long)compat_ptr(arg);
1c925604 AS	279	/* These intepret arg as an unsigned long, not as a pointer,
	280	* so we must not do compat_ptr() conversion. */
	281	case HDIO_SET_MULTCOUNT:
	282	case HDIO_SET_UNMASKINTR:
	283	case HDIO_SET_KEEPSETTINGS:
	284	case HDIO_SET_32BIT:
	285	case HDIO_SET_NOWERR:
	286	case HDIO_SET_DMA:
	287	case HDIO_SET_PIO_MODE:
	288	case HDIO_SET_NICE:
	289	case HDIO_SET_WCACHE:
	290	case HDIO_SET_ACOUSTIC:
	291	case HDIO_SET_BUSSTATE:
	292	case HDIO_SET_ADDRESS:
	293	case CDROMEJECT_SW:
	294	case CDROM_SET_OPTIONS:
	295	case CDROM_CLEAR_OPTIONS:
	296	case CDROM_SELECT_SPEED:
	297	case CDROM_SELECT_DISC:
	298	case CDROM_MEDIA_CHANGED:
	299	case CDROM_DRIVE_STATUS:
	300	case CDROM_LOCKDOOR:
	301	case CDROM_DEBUG:
7199d4cd AB	302	break;
	303	default:
	304	/* unknown ioctl number */
	305	return -ENOIOCTLCMD;
	306	}
	307
33c2dca4	308	return __blkdev_driver_ioctl(bdev, mode, cmd, arg);
7199d4cd AB	309	}
7199d4cd AB	310
45048d09 AV	311	/* Most of the generic ioctls are handled in the normal fallback path.
	312	This assumes the blkdev's low level compat_ioctl always returns
	313	ENOIOCTLCMD for unknown ioctls. */
	314	long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
f58c4c0a	315	{
45048d09 AV	316	int ret = -ENOIOCTLCMD;
	317	struct inode *inode = file->f_mapping->host;
	318	struct block_device *bdev = inode->i_bdev;
	319	struct gendisk *disk = bdev->bd_disk;
	320	fmode_t mode = file->f_mode;
45048d09	321	loff_t size;
63f26496	322	unsigned int max_sectors;
45048d09	323
fd4ce1ac CH	324	/*
	325	* O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
	326	* to updated it before every ioctl.
	327	*/
45048d09	328	if (file->f_flags & O_NDELAY)
fd4ce1ac CH	329	mode \|= FMODE_NDELAY;
	330	else
	331	mode &= ~FMODE_NDELAY;
f58c4c0a AB	332
f58c4c0a AB	333	switch (cmd) {
45048d09 AV	334	case HDIO_GETGEO:
45048d09 AV	335	return compat_hdio_getgeo(disk, bdev, compat_ptr(arg));
ac481c20 MP	336	case BLKPBSZGET:
	337	return compat_put_uint(arg, bdev_physical_block_size(bdev));
	338	case BLKIOMIN:
	339	return compat_put_uint(arg, bdev_io_min(bdev));
	340	case BLKIOOPT:
	341	return compat_put_uint(arg, bdev_io_opt(bdev));
	342	case BLKALIGNOFF:
	343	return compat_put_int(arg, bdev_alignment_offset(bdev));
98262f27	344	case BLKDISCARDZEROES:
48920ff2	345	return compat_put_uint(arg, 0);
45048d09 AV	346	case BLKFLSBUF:
	347	case BLKROSET:
	348	case BLKDISCARD:
8d57a98c	349	case BLKSECDISCARD:
3b3a1814	350	case BLKZEROOUT:
45048d09 AV	351	/*
	352	* the ones below are implemented in blkdev_locked_ioctl,
	353	* but we call blkdev_ioctl, which gets the lock for us
	354	*/
	355	case BLKRRPART:
56b26add	356	return blkdev_ioctl(bdev, mode, cmd,
45048d09 AV	357	(unsigned long)compat_ptr(arg));
45048d09 AV	358	case BLKBSZSET_32:
56b26add	359	return blkdev_ioctl(bdev, mode, BLKBSZSET,
45048d09 AV	360	(unsigned long)compat_ptr(arg));
45048d09 AV	361	case BLKPG:
56b26add	362	return compat_blkpg_ioctl(bdev, mode, cmd, compat_ptr(arg));
f58c4c0a AB	363	case BLKRAGET:
	364	case BLKFRAGET:
	365	if (!arg)
	366	return -EINVAL;
f58c4c0a	367	return compat_put_long(arg,
efa7c9f9	368	(bdev->bd_bdi->ra_pages * PAGE_SIZE) / 512);
f58c4c0a AB	369	case BLKROGET: /* compatible */
	370	return compat_put_int(arg, bdev_read_only(bdev) != 0);
	371	case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
	372	return compat_put_int(arg, block_size(bdev));
	373	case BLKSSZGET: /* get block device hardware sector size */
e1defc4f	374	return compat_put_int(arg, bdev_logical_block_size(bdev));
f58c4c0a	375	case BLKSECTGET:
63f26496 AM	376	max_sectors = min_t(unsigned int, USHRT_MAX,
	377	queue_max_sectors(bdev_get_queue(bdev)));
	378	return compat_put_ushort(arg, max_sectors);
ef00f59c MP	379	case BLKROTATIONAL:
	380	return compat_put_ushort(arg,
	381	!blk_queue_nonrot(bdev_get_queue(bdev)));
f58c4c0a AB	382	case BLKRASET: /* compatible, but no compat_ptr (!) */
	383	case BLKFRASET:
	384	if (!capable(CAP_SYS_ADMIN))
	385	return -EACCES;
efa7c9f9	386	bdev->bd_bdi->ra_pages = (arg * 512) / PAGE_SIZE;
f58c4c0a AB	387	return 0;
f58c4c0a AB	388	case BLKGETSIZE:
77304d2a	389	size = i_size_read(bdev->bd_inode);
45048d09	390	if ((size >> 9) > ~0UL)
f58c4c0a	391	return -EFBIG;
45048d09	392	return compat_put_ulong(arg, size >> 9);
f58c4c0a AB	393
f58c4c0a AB	394	case BLKGETSIZE64_32:
77304d2a	395	return compat_put_u64(arg, i_size_read(bdev->bd_inode));
171044d4 AB	396
171044d4 AB	397	case BLKTRACESETUP32:
171044d4 AB	398	case BLKTRACESTART: /* compatible */
	399	case BLKTRACESTOP: /* compatible */
	400	case BLKTRACETEARDOWN: /* compatible */
45048d09	401	ret = blk_trace_ioctl(bdev, cmd, compat_ptr(arg));
7199d4cd	402	return ret;
45048d09 AV	403	default:
	404	if (disk->fops->compat_ioctl)
	405	ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
	406	if (ret == -ENOIOCTLCMD)
	407	ret = compat_blkdev_driver_ioctl(bdev, mode, cmd, arg);
	408	return ret;
	409	}
f58c4c0a	410	}