[mirror_ubuntu-bionic-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 part;
	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;
	part = p.pno;
	if (part <= 0 || part >= disk->minors)
		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;
			}
			/* partition number in use? */
			mutex_lock(&bdev->bd_mutex);
			if (disk->part[part - 1]) {
				mutex_unlock(&bdev->bd_mutex);
				return -EBUSY;
			}
			/* overlap? */
			for (i = 0; i < disk->minors - 1; 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, part, start, length, ADDPART_FLAG_NONE);
			mutex_unlock(&bdev->bd_mutex);
			return err;
		case BLKPG_DEL_PARTITION:
			if (!disk->part[part-1])
				return -ENXIO;
			bdevp = bdget_disk(disk, part);
			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, part);
			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->minors == 1 || 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;
	18	int part;
	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;
	31	part = p.pno;
	32	if (part <= 0 \|\| part >= disk->minors)
	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	}
	46	/* partition number in use? */
c039e313	47	mutex_lock(&bdev->bd_mutex);
1da177e4	48	if (disk->part[part - 1]) {
c039e313	49	mutex_unlock(&bdev->bd_mutex);
1da177e4 LT	50	return -EBUSY;
	51	}
	52	/* overlap? */
	53	for (i = 0; i < disk->minors - 1; i++) {
	54	struct hd_struct *s = disk->part[i];
	55
	56	if (!s)
	57	continue;
	58	if (!(start+length <= s->start_sect \|\|
	59	start >= s->start_sect + s->nr_sects)) {
c039e313	60	mutex_unlock(&bdev->bd_mutex);
1da177e4 LT	61	return -EBUSY;
	62	}
	63	}
	64	/* all seems OK */
04ebd4ae	65	err = add_partition(disk, part, start, length, ADDPART_FLAG_NONE);
c039e313	66	mutex_unlock(&bdev->bd_mutex);
04ebd4ae	67	return err;
1da177e4 LT	68	case BLKPG_DEL_PARTITION:
	69	if (!disk->part[part-1])
	70	return -ENXIO;
1da177e4 LT	71	bdevp = bdget_disk(disk, part);
	72	if (!bdevp)
	73	return -ENOMEM;
2e7b651d	74	mutex_lock(&bdevp->bd_mutex);
1da177e4	75	if (bdevp->bd_openers) {
c039e313	76	mutex_unlock(&bdevp->bd_mutex);
1da177e4 LT	77	bdput(bdevp);
	78	return -EBUSY;
	79	}
	80	/* all seems OK */
	81	fsync_bdev(bdevp);
f98393a6	82	invalidate_bdev(bdevp);
1da177e4	83
6d740cd5	84	mutex_lock_nested(&bdev->bd_mutex, 1);
1da177e4	85	delete_partition(disk, part);
c039e313 AV	86	mutex_unlock(&bdev->bd_mutex);
c039e313 AV	87	mutex_unlock(&bdevp->bd_mutex);
1da177e4 LT	88	bdput(bdevp);
	89
	90	return 0;
	91	default:
	92	return -EINVAL;
	93	}
	94	}
	95
	96	static int blkdev_reread_part(struct block_device *bdev)
	97	{
	98	struct gendisk *disk = bdev->bd_disk;
	99	int res;
	100
	101	if (disk->minors == 1 \|\| bdev != bdev->bd_contains)
	102	return -EINVAL;
	103	if (!capable(CAP_SYS_ADMIN))
	104	return -EACCES;
c039e313	105	if (!mutex_trylock(&bdev->bd_mutex))
1da177e4 LT	106	return -EBUSY;
1da177e4 LT	107	res = rescan_partitions(disk, bdev);
c039e313	108	mutex_unlock(&bdev->bd_mutex);
1da177e4 LT	109	return res;
	110	}
	111
d30a2605 DW	112	static void blk_ioc_discard_endio(struct bio *bio, int err)
	113	{
	114	if (err) {
	115	if (err == -EOPNOTSUPP)
	116	set_bit(BIO_EOPNOTSUPP, &bio->bi_flags);
	117	clear_bit(BIO_UPTODATE, &bio->bi_flags);
	118	}
	119	complete(bio->bi_private);
	120	}
	121
	122	static int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
	123	uint64_t len)
	124	{
	125	struct request_queue *q = bdev_get_queue(bdev);
	126	int ret = 0;
	127
	128	if (start & 511)
	129	return -EINVAL;
	130	if (len & 511)
	131	return -EINVAL;
	132	start >>= 9;
	133	len >>= 9;
	134
	135	if (start + len > (bdev->bd_inode->i_size >> 9))
	136	return -EINVAL;
	137
	138	if (!q->prepare_discard_fn)
	139	return -EOPNOTSUPP;
	140
	141	while (len && !ret) {
	142	DECLARE_COMPLETION_ONSTACK(wait);
	143	struct bio *bio;
	144
	145	bio = bio_alloc(GFP_KERNEL, 0);
	146	if (!bio)
	147	return -ENOMEM;
	148
	149	bio->bi_end_io = blk_ioc_discard_endio;
	150	bio->bi_bdev = bdev;
	151	bio->bi_private = &wait;
	152	bio->bi_sector = start;
	153
	154	if (len > q->max_hw_sectors) {
	155	bio->bi_size = q->max_hw_sectors << 9;
	156	len -= q->max_hw_sectors;
	157	start += q->max_hw_sectors;
	158	} else {
	159	bio->bi_size = len << 9;
	160	len = 0;
	161	}
e17fc0a1	162	submit_bio(DISCARD_NOBARRIER, bio);
d30a2605 DW	163
	164	wait_for_completion(&wait);
	165
	166	if (bio_flagged(bio, BIO_EOPNOTSUPP))
	167	ret = -EOPNOTSUPP;
	168	else if (!bio_flagged(bio, BIO_UPTODATE))
	169	ret = -EIO;
	170	bio_put(bio);
	171	}
	172	return ret;
	173	}
	174
1da177e4 LT	175	static int put_ushort(unsigned long arg, unsigned short val)
	176	{
	177	return put_user(val, (unsigned short __user *)arg);
	178	}
	179
	180	static int put_int(unsigned long arg, int val)
	181	{
	182	return put_user(val, (int __user *)arg);
	183	}
	184
	185	static int put_long(unsigned long arg, long val)
	186	{
	187	return put_user(val, (long __user *)arg);
	188	}
	189
	190	static int put_ulong(unsigned long arg, unsigned long val)
	191	{
	192	return put_user(val, (unsigned long __user *)arg);
	193	}
	194
	195	static int put_u64(unsigned long arg, u64 val)
	196	{
	197	return put_user(val, (u64 __user *)arg);
	198	}
	199
bb93e3a5 AB	200	static int blkdev_locked_ioctl(struct file file, struct block_device bdev,
bb93e3a5 AB	201	unsigned cmd, unsigned long arg)
1da177e4	202	{
1da177e4 LT	203	struct backing_dev_info *bdi;
	204	int ret, n;
	205
	206	switch (cmd) {
	207	case BLKRAGET:
	208	case BLKFRAGET:
	209	if (!arg)
	210	return -EINVAL;
	211	bdi = blk_get_backing_dev_info(bdev);
	212	if (bdi == NULL)
	213	return -ENOTTY;
	214	return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
	215	case BLKROGET:
	216	return put_int(arg, bdev_read_only(bdev) != 0);
	217	case BLKBSZGET: /* get the logical block size (cf. BLKSSZGET) */
	218	return put_int(arg, block_size(bdev));
	219	case BLKSSZGET: /* get block device hardware sector size */
	220	return put_int(arg, bdev_hardsect_size(bdev));
	221	case BLKSECTGET:
	222	return put_ushort(arg, bdev_get_queue(bdev)->max_sectors);
	223	case BLKRASET:
	224	case BLKFRASET:
	225	if(!capable(CAP_SYS_ADMIN))
	226	return -EACCES;
	227	bdi = blk_get_backing_dev_info(bdev);
	228	if (bdi == NULL)
	229	return -ENOTTY;
	230	bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
	231	return 0;
	232	case BLKBSZSET:
	233	/* set the logical block size */
	234	if (!capable(CAP_SYS_ADMIN))
	235	return -EACCES;
	236	if (!arg)
	237	return -EINVAL;
	238	if (get_user(n, (int __user *) arg))
	239	return -EFAULT;
	240	if (bd_claim(bdev, file) < 0)
	241	return -EBUSY;
	242	ret = set_blocksize(bdev, n);
	243	bd_release(bdev);
	244	return ret;
	245	case BLKPG:
	246	return blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
	247	case BLKRRPART:
	248	return blkdev_reread_part(bdev);
	249	case BLKGETSIZE:
	250	if ((bdev->bd_inode->i_size >> 9) > ~0UL)
	251	return -EFBIG;
	252	return put_ulong(arg, bdev->bd_inode->i_size >> 9);
	253	case BLKGETSIZE64:
	254	return put_u64(arg, bdev->bd_inode->i_size);
2056a782 JA	255	case BLKTRACESTART:
	256	case BLKTRACESTOP:
	257	case BLKTRACESETUP:
	258	case BLKTRACETEARDOWN:
	259	return blk_trace_ioctl(bdev, cmd, (char __user *) arg);
bb93e3a5 AB	260	}
	261	return -ENOIOCTLCMD;
	262	}
	263
7006f6ec AK	264	int blkdev_driver_ioctl(struct inode inode, struct file file,
7006f6ec AK	265	struct gendisk *disk, unsigned cmd, unsigned long arg)
bb93e3a5 AB	266	{
	267	int ret;
	268	if (disk->fops->unlocked_ioctl)
	269	return disk->fops->unlocked_ioctl(file, cmd, arg);
	270
	271	if (disk->fops->ioctl) {
	272	lock_kernel();
	273	ret = disk->fops->ioctl(inode, file, cmd, arg);
	274	unlock_kernel();
	275	return ret;
	276	}
	277
	278	return -ENOTTY;
	279	}
7006f6ec	280	EXPORT_SYMBOL_GPL(blkdev_driver_ioctl);
bb93e3a5	281
f58c4c0a AB	282	/*
	283	* always keep this in sync with compat_blkdev_ioctl() and
	284	* compat_blkdev_locked_ioctl()
	285	*/
bb93e3a5 AB	286	int blkdev_ioctl(struct inode inode, struct file file, unsigned cmd,
	287	unsigned long arg)
	288	{
	289	struct block_device *bdev = inode->i_bdev;
	290	struct gendisk *disk = bdev->bd_disk;
	291	int ret, n;
	292
	293	switch(cmd) {
1da177e4 LT	294	case BLKFLSBUF:
	295	if (!capable(CAP_SYS_ADMIN))
	296	return -EACCES;
bb93e3a5 AB	297
	298	ret = blkdev_driver_ioctl(inode, file, disk, cmd, arg);
	299	/* -EINVAL to handle old uncorrected drivers */
	300	if (ret != -EINVAL && ret != -ENOTTY)
	301	return ret;
	302
	303	lock_kernel();
1da177e4	304	fsync_bdev(bdev);
f98393a6	305	invalidate_bdev(bdev);
bb93e3a5	306	unlock_kernel();
1da177e4	307	return 0;
bb93e3a5	308
1da177e4	309	case BLKROSET:
bb93e3a5 AB	310	ret = blkdev_driver_ioctl(inode, file, disk, cmd, arg);
	311	/* -EINVAL to handle old uncorrected drivers */
	312	if (ret != -EINVAL && ret != -ENOTTY)
	313	return ret;
1da177e4 LT	314	if (!capable(CAP_SYS_ADMIN))
	315	return -EACCES;
	316	if (get_user(n, (int __user *)(arg)))
	317	return -EFAULT;
bb93e3a5	318	lock_kernel();
1da177e4	319	set_device_ro(bdev, n);
bb93e3a5	320	unlock_kernel();
1da177e4	321	return 0;
d30a2605 DW	322
	323	case BLKDISCARD: {
	324	uint64_t range[2];
	325
	326	if (!(file->f_mode & FMODE_WRITE))
	327	return -EBADF;
	328
	329	if (copy_from_user(range, (void __user *)arg, sizeof(range)))
	330	return -EFAULT;
	331
	332	return blk_ioctl_discard(bdev, range[0], range[1]);
	333	}
	334
a885c8c4 CH	335	case HDIO_GETGEO: {
	336	struct hd_geometry geo;
	337
	338	if (!arg)
	339	return -EINVAL;
	340	if (!disk->fops->getgeo)
	341	return -ENOTTY;
	342
	343	/*
	344	* We need to set the startsect first, the driver may
	345	* want to override it.
	346	*/
	347	geo.start = get_start_sect(bdev);
	348	ret = disk->fops->getgeo(bdev, &geo);
	349	if (ret)
	350	return ret;
	351	if (copy_to_user((struct hd_geometry __user *)arg, &geo,
	352	sizeof(geo)))
	353	return -EFAULT;
	354	return 0;
	355	}
1da177e4	356	}
bb93e3a5 AB	357
	358	lock_kernel();
	359	ret = blkdev_locked_ioctl(file, bdev, cmd, arg);
	360	unlock_kernel();
	361	if (ret != -ENOIOCTLCMD)
	362	return ret;
	363
	364	return blkdev_driver_ioctl(inode, file, disk, cmd, arg);
1da177e4	365	}
68f66feb	366	EXPORT_SYMBOL_GPL(blkdev_ioctl);