[GitHub/mt8127/android_kernel_alcatel_ttab.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/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;
}

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

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 (arg) {
	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);
	/*
	 * 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));
	}

	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);
}
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>
	7	#include <linux/fd.h>
	8	#include <linux/hdreg.h>
	9	#include <linux/syscalls.h>
	10	#include <linux/smp_lock.h>
	11	#include <linux/types.h>
	12	#include <linux/uaccess.h>
	13
	14	static int compat_put_ushort(unsigned long arg, unsigned short val)
	15	{
	16	return put_user(val, (unsigned short __user *)compat_ptr(arg));
	17	}
	18
	19	static int compat_put_int(unsigned long arg, int val)
	20	{
	21	return put_user(val, (compat_int_t __user *)compat_ptr(arg));
	22	}
	23
	24	static int compat_put_long(unsigned long arg, long val)
	25	{
	26	return put_user(val, (compat_long_t __user *)compat_ptr(arg));
	27	}
	28
	29	static int compat_put_ulong(unsigned long arg, compat_ulong_t val)
	30	{
	31	return put_user(val, (compat_ulong_t __user *)compat_ptr(arg));
	32	}
	33
	34	static int compat_put_u64(unsigned long arg, u64 val)
	35	{
	36	return put_user(val, (compat_u64 __user *)compat_ptr(arg));
	37	}
	38
9617db08 AB	39	struct compat_hd_geometry {
	40	unsigned char heads;
	41	unsigned char sectors;
	42	unsigned short cylinders;
	43	u32 start;
	44	};
	45
	46	static int compat_hdio_getgeo(struct gendisk disk, struct block_device bdev,
	47	struct compat_hd_geometry __user *ugeo)
	48	{
	49	struct hd_geometry geo;
	50	int ret;
	51
	52	if (!ugeo)
	53	return -EINVAL;
	54	if (!disk->fops->getgeo)
	55	return -ENOTTY;
	56
	57	/*
	58	* We need to set the startsect first, the driver may
	59	* want to override it.
	60	*/
	61	geo.start = get_start_sect(bdev);
	62	ret = disk->fops->getgeo(bdev, &geo);
	63	if (ret)
	64	return ret;
	65
	66	ret = copy_to_user(ugeo, &geo, 4);
	67	ret \|= __put_user(geo.start, &ugeo->start);
	68	if (ret)
	69	ret = -EFAULT;
	70
	71	return ret;
	72	}
	73
	74	static int compat_hdio_ioctl(struct inode inode, struct file file,
	75	struct gendisk *disk, unsigned int cmd, unsigned long arg)
	76	{
	77	mm_segment_t old_fs = get_fs();
	78	unsigned long kval;
	79	unsigned int __user *uvp;
	80	int error;
	81
	82	set_fs(KERNEL_DS);
	83	error = blkdev_driver_ioctl(inode, file, disk,
	84	cmd, (unsigned long)(&kval));
	85	set_fs(old_fs);
	86
	87	if (error == 0) {
	88	uvp = compat_ptr(arg);
	89	if (put_user(kval, uvp))
	90	error = -EFAULT;
	91	}
	92	return error;
	93	}
	94
f58c4c0a AB	95	#define BLKBSZGET_32 _IOR(0x12, 112, int)
	96	#define BLKBSZSET_32 _IOW(0x12, 113, int)
	97	#define BLKGETSIZE64_32 _IOR(0x12, 114, int)
	98
171044d4 AB	99	struct compat_blk_user_trace_setup {
	100	char name[32];
	101	u16 act_mask;
	102	u32 buf_size;
	103	u32 buf_nr;
	104	compat_u64 start_lba;
	105	compat_u64 end_lba;
	106	u32 pid;
	107	};
	108	#define BLKTRACESETUP32 _IOWR(0x12, 115, struct compat_blk_user_trace_setup)
	109
	110	static int compat_blk_trace_setup(struct block_device bdev, char __user arg)
	111	{
	112	struct blk_user_trace_setup buts;
	113	struct compat_blk_user_trace_setup cbuts;
	114	struct request_queue *q;
	115	int ret;
	116
	117	q = bdev_get_queue(bdev);
	118	if (!q)
	119	return -ENXIO;
	120
	121	if (copy_from_user(&cbuts, arg, sizeof(cbuts)))
	122	return -EFAULT;
	123
	124	buts = (struct blk_user_trace_setup) {
	125	.act_mask = cbuts.act_mask,
	126	.buf_size = cbuts.buf_size,
	127	.buf_nr = cbuts.buf_nr,
	128	.start_lba = cbuts.start_lba,
	129	.end_lba = cbuts.end_lba,
	130	.pid = cbuts.pid,
	131	};
	132	memcpy(&buts.name, &cbuts.name, 32);
	133
	134	mutex_lock(&bdev->bd_mutex);
	135	ret = do_blk_trace_setup(q, bdev, &buts);
	136	mutex_unlock(&bdev->bd_mutex);
	137	if (ret)
	138	return ret;
	139
	140	if (copy_to_user(arg, &buts.name, 32))
	141	return -EFAULT;
	142
	143	return 0;
	144	}
	145
7199d4cd AB	146	static int compat_blkdev_driver_ioctl(struct inode inode, struct file file,
	147	struct gendisk *disk, unsigned cmd, unsigned long arg)
	148	{
	149	int ret;
	150
	151	switch (arg) {
9617db08 AB	152	case HDIO_GET_UNMASKINTR:
	153	case HDIO_GET_MULTCOUNT:
	154	case HDIO_GET_KEEPSETTINGS:
	155	case HDIO_GET_32BIT:
	156	case HDIO_GET_NOWERR:
	157	case HDIO_GET_DMA:
	158	case HDIO_GET_NICE:
	159	case HDIO_GET_WCACHE:
	160	case HDIO_GET_ACOUSTIC:
	161	case HDIO_GET_ADDRESS:
	162	case HDIO_GET_BUSSTATE:
	163	return compat_hdio_ioctl(inode, file, disk, cmd, arg);
7199d4cd AB	164	/*
	165	* No handler required for the ones below, we just need to
	166	* convert arg to a 64 bit pointer.
	167	*/
	168	case BLKSECTSET:
	169	/*
	170	* 0x03 -- HD/IDE ioctl's used by hdparm and friends.
	171	* Some need translations, these do not.
	172	*/
	173	case HDIO_GET_IDENTITY:
	174	case HDIO_DRIVE_TASK:
	175	case HDIO_DRIVE_CMD:
	176	case HDIO_SCAN_HWIF:
	177	/* 0x330 is reserved -- it used to be HDIO_GETGEO_BIG */
	178	case 0x330:
	179	/* 0x02 -- Floppy ioctls */
	180	case FDMSGON:
	181	case FDMSGOFF:
	182	case FDSETEMSGTRESH:
	183	case FDFLUSH:
	184	case FDWERRORCLR:
	185	case FDSETMAXERRS:
	186	case FDGETMAXERRS:
	187	case FDGETDRVTYP:
	188	case FDEJECT:
	189	case FDCLRPRM:
	190	case FDFMTBEG:
	191	case FDFMTEND:
	192	case FDRESET:
	193	case FDTWADDLE:
	194	case FDFMTTRK:
	195	case FDRAWCMD:
	196	/* CDROM stuff */
	197	case CDROMPAUSE:
	198	case CDROMRESUME:
	199	case CDROMPLAYMSF:
	200	case CDROMPLAYTRKIND:
	201	case CDROMREADTOCHDR:
	202	case CDROMREADTOCENTRY:
	203	case CDROMSTOP:
	204	case CDROMSTART:
	205	case CDROMEJECT:
	206	case CDROMVOLCTRL:
	207	case CDROMSUBCHNL:
	208	case CDROMMULTISESSION:
	209	case CDROM_GET_MCN:
	210	case CDROMRESET:
	211	case CDROMVOLREAD:
	212	case CDROMSEEK:
	213	case CDROMPLAYBLK:
	214	case CDROMCLOSETRAY:
	215	case CDROM_DISC_STATUS:
	216	case CDROM_CHANGER_NSLOTS:
	217	case CDROM_GET_CAPABILITY:
	218	/* Ignore cdrom.h about these next 5 ioctls, they absolutely do
	219	* not take a struct cdrom_read, instead they take a struct cdrom_msf
	220	* which is compatible.
	221	*/
	222	case CDROMREADMODE2:
	223	case CDROMREADMODE1:
	224	case CDROMREADRAW:
	225	case CDROMREADCOOKED:
	226	case CDROMREADALL:
	227	/* DVD ioctls */
228	case DVD_READ_STRUCT:
229	case DVD_WRITE_STRUCT:
230	case DVD_AUTH:
231	arg = (unsigned long)compat_ptr(arg);
232	/* These intepret arg as an unsigned long, not as a pointer,
233	* so we must not do compat_ptr() conversion. */
234	case HDIO_SET_MULTCOUNT:
235	case HDIO_SET_UNMASKINTR:
236	case HDIO_SET_KEEPSETTINGS:
237	case HDIO_SET_32BIT:
238	case HDIO_SET_NOWERR:
239	case HDIO_SET_DMA:
240	case HDIO_SET_PIO_MODE:
241	case HDIO_SET_NICE:
242	case HDIO_SET_WCACHE:
243	case HDIO_SET_ACOUSTIC:
244	case HDIO_SET_BUSSTATE:
245	case HDIO_SET_ADDRESS:
246	case CDROMEJECT_SW:
247	case CDROM_SET_OPTIONS:
248	case CDROM_CLEAR_OPTIONS:
249	case CDROM_SELECT_SPEED:
250	case CDROM_SELECT_DISC:
251	case CDROM_MEDIA_CHANGED:
252	case CDROM_DRIVE_STATUS:
253	case CDROM_LOCKDOOR:
254	case CDROM_DEBUG:
255	break;
256	default:
257	/* unknown ioctl number */
258	return -ENOIOCTLCMD;
259	}
260
261	if (disk->fops->unlocked_ioctl)
262	return disk->fops->unlocked_ioctl(file, cmd, arg);
263
264	if (disk->fops->ioctl) {
265	lock_kernel();
266	ret = disk->fops->ioctl(inode, file, cmd, arg);
267	unlock_kernel();
268	return ret;
269	}
270
271	return -ENOTTY;
272	}
273
f58c4c0a AB	274	static int compat_blkdev_locked_ioctl(struct inode inode, struct file file,
	275	struct block_device *bdev,
	276	unsigned cmd, unsigned long arg)
	277	{
	278	struct backing_dev_info *bdi;
	279
	280	switch (cmd) {
	281	case BLKRAGET:
	282	case BLKFRAGET:
	283	if (!arg)
	284	return -EINVAL;
	285	bdi = blk_get_backing_dev_info(bdev);
	286	if (bdi == NULL)
	287	return -ENOTTY;
	288	return compat_put_long(arg,
	289	(bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
	290	case BLKROGET: /* compatible */
	291	return compat_put_int(arg, bdev_read_only(bdev) != 0);
	292	case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
	293	return compat_put_int(arg, block_size(bdev));
	294	case BLKSSZGET: /* get block device hardware sector size */
	295	return compat_put_int(arg, bdev_hardsect_size(bdev));
	296	case BLKSECTGET:
	297	return compat_put_ushort(arg,
	298	bdev_get_queue(bdev)->max_sectors);
	299	case BLKRASET: /* compatible, but no compat_ptr (!) */
	300	case BLKFRASET:
	301	if (!capable(CAP_SYS_ADMIN))
	302	return -EACCES;
	303	bdi = blk_get_backing_dev_info(bdev);
	304	if (bdi == NULL)
	305	return -ENOTTY;
	306	bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
	307	return 0;
	308	case BLKGETSIZE:
	309	if ((bdev->bd_inode->i_size >> 9) > ~0UL)
	310	return -EFBIG;
	311	return compat_put_ulong(arg, bdev->bd_inode->i_size >> 9);
	312
	313	case BLKGETSIZE64_32:
	314	return compat_put_u64(arg, bdev->bd_inode->i_size);
171044d4 AB	315
	316	case BLKTRACESETUP32:
	317	return compat_blk_trace_setup(bdev, compat_ptr(arg));
	318	case BLKTRACESTART: /* compatible */
	319	case BLKTRACESTOP: /* compatible */
	320	case BLKTRACETEARDOWN: /* compatible */
	321	return blk_trace_ioctl(bdev, cmd, compat_ptr(arg));
f58c4c0a AB	322	}
	323	return -ENOIOCTLCMD;
	324	}
	325
	326	/* Most of the generic ioctls are handled in the normal fallback path.
	327	This assumes the blkdev's low level compat_ioctl always returns
	328	ENOIOCTLCMD for unknown ioctls. */
	329	long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
	330	{
	331	int ret = -ENOIOCTLCMD;
	332	struct inode *inode = file->f_mapping->host;
	333	struct block_device *bdev = inode->i_bdev;
	334	struct gendisk *disk = bdev->bd_disk;
	335
	336	switch (cmd) {
9617db08 AB	337	case HDIO_GETGEO:
9617db08 AB	338	return compat_hdio_getgeo(disk, bdev, compat_ptr(arg));
f58c4c0a AB	339	case BLKFLSBUF:
	340	case BLKROSET:
	341	/*
	342	* the ones below are implemented in blkdev_locked_ioctl,
	343	* but we call blkdev_ioctl, which gets the lock for us
	344	*/
	345	case BLKRRPART:
	346	return blkdev_ioctl(inode, file, cmd,
	347	(unsigned long)compat_ptr(arg));
	348	case BLKBSZSET_32:
	349	return blkdev_ioctl(inode, file, BLKBSZSET,
	350	(unsigned long)compat_ptr(arg));
	351	}
	352
	353	lock_kernel();
	354	ret = compat_blkdev_locked_ioctl(inode, file, bdev, cmd, arg);
	355	/* FIXME: why do we assume -> compat_ioctl needs the BKL? */
	356	if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
	357	ret = disk->fops->compat_ioctl(file, cmd, arg);
	358	unlock_kernel();
	359
7199d4cd AB	360	if (ret != -ENOIOCTLCMD)
	361	return ret;
	362
	363	return compat_blkdev_driver_ioctl(inode, file, disk, cmd, arg);
f58c4c0a	364	}