[mirror_ubuntu-zesty-kernel.git] / block / ioctl.c

#include <linux/capability.h>
#include <linux/blkdev.h>
#include <linux/blkpg.h>
#include <linux/hdreg.h>
#include <linux/backing-dev.h>
#include <linux/buffer_head.h>
#include <linux/smp_lock.h>
#include <linux/blktrace_api.h>
#include <asm/uaccess.h>

static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user *arg)
{
	struct block_device *bdevp;
	struct gendisk *disk;
	struct blkpg_ioctl_arg a;
	struct blkpg_partition p;
	long long start, length;
	int partno;
	int i;
	int err;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;
	if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg)))
		return -EFAULT;
	if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition)))
		return -EFAULT;
	disk = bdev->bd_disk;
	if (bdev != bdev->bd_contains)
		return -EINVAL;
	partno = p.pno;
	if (partno <= 0 || partno > disk_max_parts(disk))
		return -EINVAL;
	switch (a.op) {
		case BLKPG_ADD_PARTITION:
			start = p.start >> 9;
			length = p.length >> 9;
			/* check for fit in a hd_struct */ 
			if (sizeof(sector_t) == sizeof(long) && 
			    sizeof(long long) > sizeof(long)) {
				long pstart = start, plength = length;
				if (pstart != start || plength != length
				    || pstart < 0 || plength < 0)
					return -EINVAL;
			}

			mutex_lock(&bdev->bd_mutex);

			/* overlap? */
			for (i = 0; i < disk_max_parts(disk); i++) {
				struct hd_struct *s = disk->part[i];

				if (!s)
					continue;
				if (!(start+length <= s->start_sect ||
				      start >= s->start_sect + s->nr_sects)) {
					mutex_unlock(&bdev->bd_mutex);
					return -EBUSY;
				}
			}
			/* all seems OK */
			err = add_partition(disk, partno, start, length,
					    ADDPART_FLAG_NONE);
			mutex_unlock(&bdev->bd_mutex);
			return err;
		case BLKPG_DEL_PARTITION:
			if (!disk->part[partno - 1])
				return -ENXIO;
			bdevp = bdget_disk(disk, partno);
			if (!bdevp)
				return -ENOMEM;
			mutex_lock(&bdevp->bd_mutex);
			if (bdevp->bd_openers) {
				mutex_unlock(&bdevp->bd_mutex);
				bdput(bdevp);
				return -EBUSY;
			}
			/* all seems OK */
			fsync_bdev(bdevp);
			invalidate_bdev(bdevp);

			mutex_lock_nested(&bdev->bd_mutex, 1);
			delete_partition(disk, partno);
			mutex_unlock(&bdev->bd_mutex);
			mutex_unlock(&bdevp->bd_mutex);
			bdput(bdevp);

			return 0;
		default:
			return -EINVAL;
	}
}

static int blkdev_reread_part(struct block_device *bdev)
{
	struct gendisk *disk = bdev->bd_disk;
	int res;

	if (!disk_max_parts(disk) || bdev != bdev->bd_contains)
		return -EINVAL;
	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;
	if (!mutex_trylock(&bdev->bd_mutex))
		return -EBUSY;
	res = rescan_partitions(disk, bdev);
	mutex_unlock(&bdev->bd_mutex);
	return res;
}

static void blk_ioc_discard_endio(struct bio *bio, int err)
{
	if (err) {
		if (err == -EOPNOTSUPP)
			set_bit(BIO_EOPNOTSUPP, &bio->bi_flags);
		clear_bit(BIO_UPTODATE, &bio->bi_flags);
	}
	complete(bio->bi_private);
}

static int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
			     uint64_t len)
{
	struct request_queue *q = bdev_get_queue(bdev);
	int ret = 0;

	if (start & 511)
		return -EINVAL;
	if (len & 511)
		return -EINVAL;
	start >>= 9;
	len >>= 9;

	if (start + len > (bdev->bd_inode->i_size >> 9))
		return -EINVAL;

	if (!q->prepare_discard_fn)
		return -EOPNOTSUPP;

	while (len && !ret) {
		DECLARE_COMPLETION_ONSTACK(wait);
		struct bio *bio;

		bio = bio_alloc(GFP_KERNEL, 0);
		if (!bio)
			return -ENOMEM;

		bio->bi_end_io = blk_ioc_discard_endio;
		bio->bi_bdev = bdev;
		bio->bi_private = &wait;
		bio->bi_sector = start;

		if (len > q->max_hw_sectors) {
			bio->bi_size = q->max_hw_sectors << 9;
			len -= q->max_hw_sectors;
			start += q->max_hw_sectors;
		} else {
			bio->bi_size = len << 9;
			len = 0;
		}
		submit_bio(DISCARD_NOBARRIER, bio);

		wait_for_completion(&wait);

		if (bio_flagged(bio, BIO_EOPNOTSUPP))
			ret = -EOPNOTSUPP;
		else if (!bio_flagged(bio, BIO_UPTODATE))
			ret = -EIO;
		bio_put(bio);
	}
	return ret;
}

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

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

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

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

static int put_u64(unsigned long arg, u64 val)
{
	return put_user(val, (u64 __user *)arg);
}

static int blkdev_locked_ioctl(struct file *file, struct block_device *bdev,
				unsigned cmd, unsigned long arg)
{
	struct backing_dev_info *bdi;
	int ret, n;

	switch (cmd) {
	case BLKRAGET:
	case BLKFRAGET:
		if (!arg)
			return -EINVAL;
		bdi = blk_get_backing_dev_info(bdev);
		if (bdi == NULL)
			return -ENOTTY;
		return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
	case BLKROGET:
		return put_int(arg, bdev_read_only(bdev) != 0);
	case BLKBSZGET: /* get the logical block size (cf. BLKSSZGET) */
		return put_int(arg, block_size(bdev));
	case BLKSSZGET: /* get block device hardware sector size */
		return put_int(arg, bdev_hardsect_size(bdev));
	case BLKSECTGET:
		return put_ushort(arg, bdev_get_queue(bdev)->max_sectors);
	case BLKRASET:
	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 BLKBSZSET:
		/* set the logical block size */
		if (!capable(CAP_SYS_ADMIN))
			return -EACCES;
		if (!arg)
			return -EINVAL;
		if (get_user(n, (int __user *) arg))
			return -EFAULT;
		if (bd_claim(bdev, file) < 0)
			return -EBUSY;
		ret = set_blocksize(bdev, n);
		bd_release(bdev);
		return ret;
	case BLKPG:
		return blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
	case BLKRRPART:
		return blkdev_reread_part(bdev);
	case BLKGETSIZE:
		if ((bdev->bd_inode->i_size >> 9) > ~0UL)
			return -EFBIG;
		return put_ulong(arg, bdev->bd_inode->i_size >> 9);
	case BLKGETSIZE64:
		return put_u64(arg, bdev->bd_inode->i_size);
	case BLKTRACESTART:
	case BLKTRACESTOP:
	case BLKTRACESETUP:
	case BLKTRACETEARDOWN:
		return blk_trace_ioctl(bdev, cmd, (char __user *) arg);
	}
	return -ENOIOCTLCMD;
}

int blkdev_driver_ioctl(struct inode *inode, struct file *file,
			struct gendisk *disk, unsigned cmd, unsigned long arg)
{
	int ret;
	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;
}
EXPORT_SYMBOL_GPL(blkdev_driver_ioctl);

/*
 * always keep this in sync with compat_blkdev_ioctl() and
 * compat_blkdev_locked_ioctl()
 */
int blkdev_ioctl(struct inode *inode, struct file *file, unsigned cmd,
			unsigned long arg)
{
	struct block_device *bdev = inode->i_bdev;
	struct gendisk *disk = bdev->bd_disk;
	int ret, n;

	switch(cmd) {
	case BLKFLSBUF:
		if (!capable(CAP_SYS_ADMIN))
			return -EACCES;

		ret = blkdev_driver_ioctl(inode, file, disk, cmd, arg);
		/* -EINVAL to handle old uncorrected drivers */
		if (ret != -EINVAL && ret != -ENOTTY)
			return ret;

		lock_kernel();
		fsync_bdev(bdev);
		invalidate_bdev(bdev);
		unlock_kernel();
		return 0;

	case BLKROSET:
		ret = blkdev_driver_ioctl(inode, file, disk, cmd, arg);
		/* -EINVAL to handle old uncorrected drivers */
		if (ret != -EINVAL && ret != -ENOTTY)
			return ret;
		if (!capable(CAP_SYS_ADMIN))
			return -EACCES;
		if (get_user(n, (int __user *)(arg)))
			return -EFAULT;
		lock_kernel();
		set_device_ro(bdev, n);
		unlock_kernel();
		return 0;

	case BLKDISCARD: {
		uint64_t range[2];

		if (!(file->f_mode & FMODE_WRITE))
			return -EBADF;

		if (copy_from_user(range, (void __user *)arg, sizeof(range)))
			return -EFAULT;

		return blk_ioctl_discard(bdev, range[0], range[1]);
	}

	case HDIO_GETGEO: {
		struct hd_geometry geo;

		if (!arg)
			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;
		if (copy_to_user((struct hd_geometry __user *)arg, &geo,
					sizeof(geo)))
			return -EFAULT;
		return 0;
	}
	}

	lock_kernel();
	ret = blkdev_locked_ioctl(file, bdev, cmd, arg);
	unlock_kernel();
	if (ret != -ENOIOCTLCMD)
		return ret;

	return blkdev_driver_ioctl(inode, file, disk, cmd, arg);
}
EXPORT_SYMBOL_GPL(blkdev_ioctl);
Commit	Line	Data
c59ede7b	1	#include <linux/capability.h>
1da177e4 LT	2	#include <linux/blkdev.h>
1da177e4 LT	3	#include <linux/blkpg.h>
a885c8c4	4	#include <linux/hdreg.h>
1da177e4 LT	5	#include <linux/backing-dev.h>
	6	#include <linux/buffer_head.h>
	7	#include <linux/smp_lock.h>
2056a782	8	#include <linux/blktrace_api.h>
1da177e4 LT	9	#include <asm/uaccess.h>
	10
	11	static int blkpg_ioctl(struct block_device bdev, struct blkpg_ioctl_arg __user arg)
	12	{
	13	struct block_device *bdevp;
	14	struct gendisk *disk;
	15	struct blkpg_ioctl_arg a;
	16	struct blkpg_partition p;
	17	long long start, length;
cf771cb5	18	int partno;
1da177e4	19	int i;
04ebd4ae	20	int err;
1da177e4 LT	21
	22	if (!capable(CAP_SYS_ADMIN))
	23	return -EACCES;
	24	if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg)))
	25	return -EFAULT;
	26	if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition)))
	27	return -EFAULT;
	28	disk = bdev->bd_disk;
	29	if (bdev != bdev->bd_contains)
	30	return -EINVAL;
cf771cb5	31	partno = p.pno;
f331c029	32	if (partno <= 0 \|\| partno > disk_max_parts(disk))
1da177e4 LT	33	return -EINVAL;
	34	switch (a.op) {
	35	case BLKPG_ADD_PARTITION:
	36	start = p.start >> 9;
	37	length = p.length >> 9;
	38	/* check for fit in a hd_struct */
	39	if (sizeof(sector_t) == sizeof(long) &&
	40	sizeof(long long) > sizeof(long)) {
	41	long pstart = start, plength = length;
	42	if (pstart != start \|\| plength != length
	43	\|\| pstart < 0 \|\| plength < 0)
	44	return -EINVAL;
	45	}
88e34126	46
c039e313	47	mutex_lock(&bdev->bd_mutex);
88e34126	48
1da177e4	49	/* overlap? */
f331c029	50	for (i = 0; i < disk_max_parts(disk); i++) {
1da177e4 LT	51	struct hd_struct *s = disk->part[i];
	52
	53	if (!s)
	54	continue;
	55	if (!(start+length <= s->start_sect \|\|
	56	start >= s->start_sect + s->nr_sects)) {
c039e313	57	mutex_unlock(&bdev->bd_mutex);
1da177e4 LT	58	return -EBUSY;
	59	}
	60	}
	61	/* all seems OK */
cf771cb5 TH	62	err = add_partition(disk, partno, start, length,
cf771cb5 TH	63	ADDPART_FLAG_NONE);
c039e313	64	mutex_unlock(&bdev->bd_mutex);
04ebd4ae	65	return err;
1da177e4	66	case BLKPG_DEL_PARTITION:
cf771cb5	67	if (!disk->part[partno - 1])
1da177e4	68	return -ENXIO;
cf771cb5	69	bdevp = bdget_disk(disk, partno);
1da177e4 LT	70	if (!bdevp)
1da177e4 LT	71	return -ENOMEM;
2e7b651d	72	mutex_lock(&bdevp->bd_mutex);
1da177e4	73	if (bdevp->bd_openers) {
c039e313	74	mutex_unlock(&bdevp->bd_mutex);
1da177e4 LT	75	bdput(bdevp);
	76	return -EBUSY;
	77	}
	78	/* all seems OK */
	79	fsync_bdev(bdevp);
f98393a6	80	invalidate_bdev(bdevp);
1da177e4	81
6d740cd5	82	mutex_lock_nested(&bdev->bd_mutex, 1);
cf771cb5	83	delete_partition(disk, partno);
c039e313 AV	84	mutex_unlock(&bdev->bd_mutex);
c039e313 AV	85	mutex_unlock(&bdevp->bd_mutex);
1da177e4 LT	86	bdput(bdevp);
	87
	88	return 0;
	89	default:
	90	return -EINVAL;
	91	}
	92	}
	93
	94	static int blkdev_reread_part(struct block_device *bdev)
	95	{
	96	struct gendisk *disk = bdev->bd_disk;
	97	int res;
	98
f331c029	99	if (!disk_max_parts(disk) \|\| bdev != bdev->bd_contains)
1da177e4 LT	100	return -EINVAL;
	101	if (!capable(CAP_SYS_ADMIN))
	102	return -EACCES;
c039e313	103	if (!mutex_trylock(&bdev->bd_mutex))
1da177e4 LT	104	return -EBUSY;
1da177e4 LT	105	res = rescan_partitions(disk, bdev);
c039e313	106	mutex_unlock(&bdev->bd_mutex);
1da177e4 LT	107	return res;
	108	}
	109
d30a2605 DW	110	static void blk_ioc_discard_endio(struct bio *bio, int err)
	111	{
	112	if (err) {
	113	if (err == -EOPNOTSUPP)
	114	set_bit(BIO_EOPNOTSUPP, &bio->bi_flags);
	115	clear_bit(BIO_UPTODATE, &bio->bi_flags);
	116	}
	117	complete(bio->bi_private);
	118	}
	119
	120	static int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
	121	uint64_t len)
	122	{
	123	struct request_queue *q = bdev_get_queue(bdev);
	124	int ret = 0;
	125
	126	if (start & 511)
	127	return -EINVAL;
	128	if (len & 511)
	129	return -EINVAL;
	130	start >>= 9;
	131	len >>= 9;
	132
	133	if (start + len > (bdev->bd_inode->i_size >> 9))
	134	return -EINVAL;
	135
	136	if (!q->prepare_discard_fn)
	137	return -EOPNOTSUPP;
	138
	139	while (len && !ret) {
	140	DECLARE_COMPLETION_ONSTACK(wait);
	141	struct bio *bio;
	142
	143	bio = bio_alloc(GFP_KERNEL, 0);
	144	if (!bio)
	145	return -ENOMEM;
	146
	147	bio->bi_end_io = blk_ioc_discard_endio;
	148	bio->bi_bdev = bdev;
	149	bio->bi_private = &wait;
	150	bio->bi_sector = start;
	151
	152	if (len > q->max_hw_sectors) {
	153	bio->bi_size = q->max_hw_sectors << 9;
	154	len -= q->max_hw_sectors;
	155	start += q->max_hw_sectors;
	156	} else {
	157	bio->bi_size = len << 9;
	158	len = 0;
	159	}
e17fc0a1	160	submit_bio(DISCARD_NOBARRIER, bio);
d30a2605 DW	161
	162	wait_for_completion(&wait);
	163
	164	if (bio_flagged(bio, BIO_EOPNOTSUPP))
	165	ret = -EOPNOTSUPP;
	166	else if (!bio_flagged(bio, BIO_UPTODATE))
	167	ret = -EIO;
	168	bio_put(bio);
	169	}
	170	return ret;
	171	}
	172
1da177e4 LT	173	static int put_ushort(unsigned long arg, unsigned short val)
	174	{
	175	return put_user(val, (unsigned short __user *)arg);
	176	}
	177
	178	static int put_int(unsigned long arg, int val)
	179	{
	180	return put_user(val, (int __user *)arg);
	181	}
	182
	183	static int put_long(unsigned long arg, long val)
	184	{
	185	return put_user(val, (long __user *)arg);
	186	}
	187
	188	static int put_ulong(unsigned long arg, unsigned long val)
	189	{
	190	return put_user(val, (unsigned long __user *)arg);
	191	}
	192
	193	static int put_u64(unsigned long arg, u64 val)
	194	{
	195	return put_user(val, (u64 __user *)arg);
	196	}
	197
bb93e3a5 AB	198	static int blkdev_locked_ioctl(struct file file, struct block_device bdev,
bb93e3a5 AB	199	unsigned cmd, unsigned long arg)
1da177e4	200	{
1da177e4 LT	201	struct backing_dev_info *bdi;
	202	int ret, n;
	203
	204	switch (cmd) {
	205	case BLKRAGET:
	206	case BLKFRAGET:
	207	if (!arg)
	208	return -EINVAL;
	209	bdi = blk_get_backing_dev_info(bdev);
	210	if (bdi == NULL)
	211	return -ENOTTY;
	212	return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
	213	case BLKROGET:
	214	return put_int(arg, bdev_read_only(bdev) != 0);
	215	case BLKBSZGET: /* get the logical block size (cf. BLKSSZGET) */
	216	return put_int(arg, block_size(bdev));
	217	case BLKSSZGET: /* get block device hardware sector size */
	218	return put_int(arg, bdev_hardsect_size(bdev));
	219	case BLKSECTGET:
	220	return put_ushort(arg, bdev_get_queue(bdev)->max_sectors);
	221	case BLKRASET:
	222	case BLKFRASET:
	223	if(!capable(CAP_SYS_ADMIN))
	224	return -EACCES;
	225	bdi = blk_get_backing_dev_info(bdev);
	226	if (bdi == NULL)
	227	return -ENOTTY;
	228	bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
	229	return 0;
	230	case BLKBSZSET:
	231	/* set the logical block size */
	232	if (!capable(CAP_SYS_ADMIN))
	233	return -EACCES;
	234	if (!arg)
	235	return -EINVAL;
	236	if (get_user(n, (int __user *) arg))
	237	return -EFAULT;
	238	if (bd_claim(bdev, file) < 0)
	239	return -EBUSY;
	240	ret = set_blocksize(bdev, n);
	241	bd_release(bdev);
	242	return ret;
	243	case BLKPG:
	244	return blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
	245	case BLKRRPART:
	246	return blkdev_reread_part(bdev);
	247	case BLKGETSIZE:
	248	if ((bdev->bd_inode->i_size >> 9) > ~0UL)
	249	return -EFBIG;
	250	return put_ulong(arg, bdev->bd_inode->i_size >> 9);
	251	case BLKGETSIZE64:
	252	return put_u64(arg, bdev->bd_inode->i_size);
2056a782 JA	253	case BLKTRACESTART:
	254	case BLKTRACESTOP:
	255	case BLKTRACESETUP:
	256	case BLKTRACETEARDOWN:
	257	return blk_trace_ioctl(bdev, cmd, (char __user *) arg);
bb93e3a5 AB	258	}
	259	return -ENOIOCTLCMD;
	260	}
	261
7006f6ec AK	262	int blkdev_driver_ioctl(struct inode inode, struct file file,
7006f6ec AK	263	struct gendisk *disk, unsigned cmd, unsigned long arg)
bb93e3a5 AB	264	{
	265	int ret;
	266	if (disk->fops->unlocked_ioctl)
	267	return disk->fops->unlocked_ioctl(file, cmd, arg);
	268
	269	if (disk->fops->ioctl) {
	270	lock_kernel();
	271	ret = disk->fops->ioctl(inode, file, cmd, arg);
	272	unlock_kernel();
	273	return ret;
	274	}
	275
	276	return -ENOTTY;
	277	}
7006f6ec	278	EXPORT_SYMBOL_GPL(blkdev_driver_ioctl);
bb93e3a5	279
f58c4c0a AB	280	/*
	281	* always keep this in sync with compat_blkdev_ioctl() and
	282	* compat_blkdev_locked_ioctl()
	283	*/
bb93e3a5 AB	284	int blkdev_ioctl(struct inode inode, struct file file, unsigned cmd,
	285	unsigned long arg)
	286	{
	287	struct block_device *bdev = inode->i_bdev;
	288	struct gendisk *disk = bdev->bd_disk;
	289	int ret, n;
	290
	291	switch(cmd) {
1da177e4 LT	292	case BLKFLSBUF:
	293	if (!capable(CAP_SYS_ADMIN))
	294	return -EACCES;
bb93e3a5 AB	295
	296	ret = blkdev_driver_ioctl(inode, file, disk, cmd, arg);
	297	/* -EINVAL to handle old uncorrected drivers */
	298	if (ret != -EINVAL && ret != -ENOTTY)
	299	return ret;
	300
	301	lock_kernel();
1da177e4	302	fsync_bdev(bdev);
f98393a6	303	invalidate_bdev(bdev);
bb93e3a5	304	unlock_kernel();
1da177e4	305	return 0;
bb93e3a5	306
1da177e4	307	case BLKROSET:
bb93e3a5 AB	308	ret = blkdev_driver_ioctl(inode, file, disk, cmd, arg);
	309	/* -EINVAL to handle old uncorrected drivers */
	310	if (ret != -EINVAL && ret != -ENOTTY)
	311	return ret;
1da177e4 LT	312	if (!capable(CAP_SYS_ADMIN))
	313	return -EACCES;
	314	if (get_user(n, (int __user *)(arg)))
	315	return -EFAULT;
bb93e3a5	316	lock_kernel();
1da177e4	317	set_device_ro(bdev, n);
bb93e3a5	318	unlock_kernel();
1da177e4	319	return 0;
d30a2605 DW	320
	321	case BLKDISCARD: {
	322	uint64_t range[2];
	323
	324	if (!(file->f_mode & FMODE_WRITE))
	325	return -EBADF;
	326
	327	if (copy_from_user(range, (void __user *)arg, sizeof(range)))
	328	return -EFAULT;
	329
	330	return blk_ioctl_discard(bdev, range[0], range[1]);
	331	}
	332
a885c8c4 CH	333	case HDIO_GETGEO: {
	334	struct hd_geometry geo;
	335
	336	if (!arg)
	337	return -EINVAL;
	338	if (!disk->fops->getgeo)
	339	return -ENOTTY;
	340
	341	/*
	342	* We need to set the startsect first, the driver may
	343	* want to override it.
	344	*/
	345	geo.start = get_start_sect(bdev);
	346	ret = disk->fops->getgeo(bdev, &geo);
	347	if (ret)
	348	return ret;
	349	if (copy_to_user((struct hd_geometry __user *)arg, &geo,
	350	sizeof(geo)))
	351	return -EFAULT;
	352	return 0;
	353	}
1da177e4	354	}
bb93e3a5 AB	355
	356	lock_kernel();
	357	ret = blkdev_locked_ioctl(file, bdev, cmd, arg);
	358	unlock_kernel();
	359	if (ret != -ENOIOCTLCMD)
	360	return ret;
	361
	362	return blkdev_driver_ioctl(inode, file, disk, cmd, arg);
1da177e4	363	}
68f66feb	364	EXPORT_SYMBOL_GPL(blkdev_ioctl);