[linux-2.6-block.git] / block / ioctl.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/capability.h>
#include <linux/compat.h>
#include <linux/blkdev.h>
#include <linux/export.h>
#include <linux/gfp.h>
#include <linux/blkpg.h>
#include <linux/hdreg.h>
#include <linux/backing-dev.h>
#include <linux/fs.h>
#include <linux/blktrace_api.h>
#include <linux/pr.h>
#include <linux/uaccess.h>
#include "blk.h"

static int blkpg_do_ioctl(struct block_device *bdev,
			  struct blkpg_partition __user *upart, int op)
{
	struct blkpg_partition p;
	long long start, length;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;
	if (copy_from_user(&p, upart, sizeof(struct blkpg_partition)))
		return -EFAULT;
	if (bdev_is_partition(bdev))
		return -EINVAL;

	if (p.pno <= 0)
		return -EINVAL;

	if (op == BLKPG_DEL_PARTITION)
		return bdev_del_partition(bdev, p.pno);

	start = p.start >> SECTOR_SHIFT;
	length = p.length >> SECTOR_SHIFT;

	switch (op) {
	case BLKPG_ADD_PARTITION:
		/* check if partition is aligned to blocksize */
		if (p.start & (bdev_logical_block_size(bdev) - 1))
			return -EINVAL;
		return bdev_add_partition(bdev, p.pno, start, length);
	case BLKPG_RESIZE_PARTITION:
		return bdev_resize_partition(bdev, p.pno, start, length);
	default:
		return -EINVAL;
	}
}

static int blkpg_ioctl(struct block_device *bdev,
		       struct blkpg_ioctl_arg __user *arg)
{
	struct blkpg_partition __user *udata;
	int op;

	if (get_user(op, &arg->op) || get_user(udata, &arg->data))
		return -EFAULT;

	return blkpg_do_ioctl(bdev, udata, op);
}

#ifdef CONFIG_COMPAT
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,
			      struct compat_blkpg_ioctl_arg __user *arg)
{
	compat_caddr_t udata;
	int op;

	if (get_user(op, &arg->op) || get_user(udata, &arg->data))
		return -EFAULT;

	return blkpg_do_ioctl(bdev, compat_ptr(udata), op);
}
#endif

static int blkdev_reread_part(struct block_device *bdev, fmode_t mode)
{
	struct block_device *tmp;

	if (!disk_part_scan_enabled(bdev->bd_disk) || bdev_is_partition(bdev))
		return -EINVAL;
	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;
	if (bdev->bd_disk->open_partitions)
		return -EBUSY;

	/*
	 * Reopen the device to revalidate the driver state and force a
	 * partition rescan.
	 */
	mode &= ~FMODE_EXCL;
	set_bit(GD_NEED_PART_SCAN, &bdev->bd_disk->state);

	tmp = blkdev_get_by_dev(bdev->bd_dev, mode, NULL);
	if (IS_ERR(tmp))
		return PTR_ERR(tmp);
	blkdev_put(tmp, mode);
	return 0;
}

static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode,
		unsigned long arg, unsigned long flags)
{
	uint64_t range[2];
	uint64_t start, len;
	struct request_queue *q = bdev_get_queue(bdev);
	int err;

	if (!(mode & FMODE_WRITE))
		return -EBADF;

	if (!blk_queue_discard(q))
		return -EOPNOTSUPP;

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

	start = range[0];
	len = range[1];

	if (start & 511)
		return -EINVAL;
	if (len & 511)
		return -EINVAL;

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

	err = truncate_bdev_range(bdev, mode, start, start + len - 1);
	if (err)
		return err;

	return blkdev_issue_discard(bdev, start >> 9, len >> 9,
				    GFP_KERNEL, flags);
}

static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode,
		unsigned long arg)
{
	uint64_t range[2];
	uint64_t start, end, len;
	int err;

	if (!(mode & FMODE_WRITE))
		return -EBADF;

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

	start = range[0];
	len = range[1];
	end = start + len - 1;

	if (start & 511)
		return -EINVAL;
	if (len & 511)
		return -EINVAL;
	if (end >= (uint64_t)i_size_read(bdev->bd_inode))
		return -EINVAL;
	if (end < start)
		return -EINVAL;

	/* Invalidate the page cache, including dirty pages */
	err = truncate_bdev_range(bdev, mode, start, end);
	if (err)
		return err;

	return blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL,
			BLKDEV_ZERO_NOUNMAP);
}

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

static int put_int(int __user *argp, int val)
{
	return put_user(val, argp);
}

static int put_uint(unsigned int __user *argp, unsigned int val)
{
	return put_user(val, argp);
}

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

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

static int put_u64(u64 __user *argp, u64 val)
{
	return put_user(val, argp);
}

#ifdef CONFIG_COMPAT
static int compat_put_long(compat_long_t __user *argp, long val)
{
	return put_user(val, argp);
}

static int compat_put_ulong(compat_ulong_t __user *argp, compat_ulong_t val)
{
	return put_user(val, argp);
}
#endif

#ifdef CONFIG_COMPAT
/*
 * This is the equivalent of compat_ptr_ioctl(), to be used by block
 * drivers that implement only commands that are completely compatible
 * between 32-bit and 64-bit user space
 */
int blkdev_compat_ptr_ioctl(struct block_device *bdev, fmode_t mode,
			unsigned cmd, unsigned long arg)
{
	struct gendisk *disk = bdev->bd_disk;

	if (disk->fops->ioctl)
		return disk->fops->ioctl(bdev, mode, cmd,
					 (unsigned long)compat_ptr(arg));

	return -ENOIOCTLCMD;
}
EXPORT_SYMBOL(blkdev_compat_ptr_ioctl);
#endif

static int blkdev_pr_register(struct block_device *bdev,
		struct pr_registration __user *arg)
{
	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
	struct pr_registration reg;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;
	if (!ops || !ops->pr_register)
		return -EOPNOTSUPP;
	if (copy_from_user(&reg, arg, sizeof(reg)))
		return -EFAULT;

	if (reg.flags & ~PR_FL_IGNORE_KEY)
		return -EOPNOTSUPP;
	return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags);
}

static int blkdev_pr_reserve(struct block_device *bdev,
		struct pr_reservation __user *arg)
{
	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
	struct pr_reservation rsv;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;
	if (!ops || !ops->pr_reserve)
		return -EOPNOTSUPP;
	if (copy_from_user(&rsv, arg, sizeof(rsv)))
		return -EFAULT;

	if (rsv.flags & ~PR_FL_IGNORE_KEY)
		return -EOPNOTSUPP;
	return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags);
}

static int blkdev_pr_release(struct block_device *bdev,
		struct pr_reservation __user *arg)
{
	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
	struct pr_reservation rsv;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;
	if (!ops || !ops->pr_release)
		return -EOPNOTSUPP;
	if (copy_from_user(&rsv, arg, sizeof(rsv)))
		return -EFAULT;

	if (rsv.flags)
		return -EOPNOTSUPP;
	return ops->pr_release(bdev, rsv.key, rsv.type);
}

static int blkdev_pr_preempt(struct block_device *bdev,
		struct pr_preempt __user *arg, bool abort)
{
	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
	struct pr_preempt p;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;
	if (!ops || !ops->pr_preempt)
		return -EOPNOTSUPP;
	if (copy_from_user(&p, arg, sizeof(p)))
		return -EFAULT;

	if (p.flags)
		return -EOPNOTSUPP;
	return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort);
}

static int blkdev_pr_clear(struct block_device *bdev,
		struct pr_clear __user *arg)
{
	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
	struct pr_clear c;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;
	if (!ops || !ops->pr_clear)
		return -EOPNOTSUPP;
	if (copy_from_user(&c, arg, sizeof(c)))
		return -EFAULT;

	if (c.flags)
		return -EOPNOTSUPP;
	return ops->pr_clear(bdev, c.key);
}

static int blkdev_flushbuf(struct block_device *bdev, fmode_t mode,
		unsigned cmd, unsigned long arg)
{
	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;
	fsync_bdev(bdev);
	invalidate_bdev(bdev);
	return 0;
}

static int blkdev_roset(struct block_device *bdev, fmode_t mode,
		unsigned cmd, unsigned long arg)
{
	int ret, n;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;

	if (get_user(n, (int __user *)arg))
		return -EFAULT;
	if (bdev->bd_disk->fops->set_read_only) {
		ret = bdev->bd_disk->fops->set_read_only(bdev, n);
		if (ret)
			return ret;
	}
	bdev->bd_read_only = n;
	return 0;
}

static int blkdev_getgeo(struct block_device *bdev,
		struct hd_geometry __user *argp)
{
	struct gendisk *disk = bdev->bd_disk;
	struct hd_geometry geo;
	int ret;

	if (!argp)
		return -EINVAL;
	if (!disk->fops->getgeo)
		return -ENOTTY;

	/*
	 * We need to set the startsect first, the driver may
	 * want to override it.
	 */
	memset(&geo, 0, sizeof(geo));
	geo.start = get_start_sect(bdev);
	ret = disk->fops->getgeo(bdev, &geo);
	if (ret)
		return ret;
	if (copy_to_user(argp, &geo, sizeof(geo)))
		return -EFAULT;
	return 0;
}

#ifdef CONFIG_COMPAT
struct compat_hd_geometry {
	unsigned char heads;
	unsigned char sectors;
	unsigned short cylinders;
	u32 start;
};

static int compat_hdio_getgeo(struct block_device *bdev,
			      struct compat_hd_geometry __user *ugeo)
{
	struct gendisk *disk = bdev->bd_disk;
	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;
}
#endif

/* set the logical block size */
static int blkdev_bszset(struct block_device *bdev, fmode_t mode,
		int __user *argp)
{
	int ret, n;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;
	if (!argp)
		return -EINVAL;
	if (get_user(n, argp))
		return -EFAULT;

	if (mode & FMODE_EXCL)
		return set_blocksize(bdev, n);

	if (IS_ERR(blkdev_get_by_dev(bdev->bd_dev, mode | FMODE_EXCL, &bdev)))
		return -EBUSY;
	ret = set_blocksize(bdev, n);
	blkdev_put(bdev, mode | FMODE_EXCL);

	return ret;
}

/*
 * Common commands that are handled the same way on native and compat
 * user space. Note the separate arg/argp parameters that are needed
 * to deal with the compat_ptr() conversion.
 */
static int blkdev_common_ioctl(struct block_device *bdev, fmode_t mode,
				unsigned cmd, unsigned long arg, void __user *argp)
{
	unsigned int max_sectors;

	switch (cmd) {
	case BLKFLSBUF:
		return blkdev_flushbuf(bdev, mode, cmd, arg);
	case BLKROSET:
		return blkdev_roset(bdev, mode, cmd, arg);
	case BLKDISCARD:
		return blk_ioctl_discard(bdev, mode, arg, 0);
	case BLKSECDISCARD:
		return blk_ioctl_discard(bdev, mode, arg,
				BLKDEV_DISCARD_SECURE);
	case BLKZEROOUT:
		return blk_ioctl_zeroout(bdev, mode, arg);
	case BLKREPORTZONE:
		return blkdev_report_zones_ioctl(bdev, mode, cmd, arg);
	case BLKRESETZONE:
	case BLKOPENZONE:
	case BLKCLOSEZONE:
	case BLKFINISHZONE:
		return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg);
	case BLKGETZONESZ:
		return put_uint(argp, bdev_zone_sectors(bdev));
	case BLKGETNRZONES:
		return put_uint(argp, blkdev_nr_zones(bdev->bd_disk));
	case BLKROGET:
		return put_int(argp, bdev_read_only(bdev) != 0);
	case BLKSSZGET: /* get block device logical block size */
		return put_int(argp, bdev_logical_block_size(bdev));
	case BLKPBSZGET: /* get block device physical block size */
		return put_uint(argp, bdev_physical_block_size(bdev));
	case BLKIOMIN:
		return put_uint(argp, bdev_io_min(bdev));
	case BLKIOOPT:
		return put_uint(argp, bdev_io_opt(bdev));
	case BLKALIGNOFF:
		return put_int(argp, bdev_alignment_offset(bdev));
	case BLKDISCARDZEROES:
		return put_uint(argp, 0);
	case BLKSECTGET:
		max_sectors = min_t(unsigned int, USHRT_MAX,
				    queue_max_sectors(bdev_get_queue(bdev)));
		return put_ushort(argp, max_sectors);
	case BLKROTATIONAL:
		return put_ushort(argp, !blk_queue_nonrot(bdev_get_queue(bdev)));
	case BLKRASET:
	case BLKFRASET:
		if(!capable(CAP_SYS_ADMIN))
			return -EACCES;
		bdev->bd_bdi->ra_pages = (arg * 512) / PAGE_SIZE;
		return 0;
	case BLKRRPART:
		return blkdev_reread_part(bdev, mode);
	case BLKTRACESTART:
	case BLKTRACESTOP:
	case BLKTRACETEARDOWN:
		return blk_trace_ioctl(bdev, cmd, argp);
	case IOC_PR_REGISTER:
		return blkdev_pr_register(bdev, argp);
	case IOC_PR_RESERVE:
		return blkdev_pr_reserve(bdev, argp);
	case IOC_PR_RELEASE:
		return blkdev_pr_release(bdev, argp);
	case IOC_PR_PREEMPT:
		return blkdev_pr_preempt(bdev, argp, false);
	case IOC_PR_PREEMPT_ABORT:
		return blkdev_pr_preempt(bdev, argp, true);
	case IOC_PR_CLEAR:
		return blkdev_pr_clear(bdev, argp);
	default:
		return -ENOIOCTLCMD;
	}
}

/*
 * Always keep this in sync with compat_blkdev_ioctl()
 * to handle all incompatible commands in both functions.
 *
 * New commands must be compatible and go into blkdev_common_ioctl
 */
int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
			unsigned long arg)
{
	int ret;
	loff_t size;
	void __user *argp = (void __user *)arg;

	switch (cmd) {
	/* These need separate implementations for the data structure */
	case HDIO_GETGEO:
		return blkdev_getgeo(bdev, argp);
	case BLKPG:
		return blkpg_ioctl(bdev, argp);

	/* Compat mode returns 32-bit data instead of 'long' */
	case BLKRAGET:
	case BLKFRAGET:
		if (!argp)
			return -EINVAL;
		return put_long(argp, (bdev->bd_bdi->ra_pages*PAGE_SIZE) / 512);
	case BLKGETSIZE:
		size = i_size_read(bdev->bd_inode);
		if ((size >> 9) > ~0UL)
			return -EFBIG;
		return put_ulong(argp, size >> 9);

	/* The data is compatible, but the command number is different */
	case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
		return put_int(argp, block_size(bdev));
	case BLKBSZSET:
		return blkdev_bszset(bdev, mode, argp);
	case BLKGETSIZE64:
		return put_u64(argp, i_size_read(bdev->bd_inode));

	/* Incompatible alignment on i386 */
	case BLKTRACESETUP:
		return blk_trace_ioctl(bdev, cmd, argp);
	default:
		break;
	}

	ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
	if (ret != -ENOIOCTLCMD)
		return ret;

	if (!bdev->bd_disk->fops->ioctl)
		return -ENOTTY;
	return bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg);
}
EXPORT_SYMBOL_GPL(blkdev_ioctl); /* for /dev/raw */

#ifdef CONFIG_COMPAT

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

/* 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;
	void __user *argp = compat_ptr(arg);
	struct block_device *bdev = I_BDEV(file->f_mapping->host);
	struct gendisk *disk = bdev->bd_disk;
	fmode_t mode = file->f_mode;
	loff_t size;

	/*
	 * 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) {
	/* These need separate implementations for the data structure */
	case HDIO_GETGEO:
		return compat_hdio_getgeo(bdev, argp);
	case BLKPG:
		return compat_blkpg_ioctl(bdev, argp);

	/* Compat mode returns 32-bit data instead of 'long' */
	case BLKRAGET:
	case BLKFRAGET:
		if (!argp)
			return -EINVAL;
		return compat_put_long(argp,
			       (bdev->bd_bdi->ra_pages * PAGE_SIZE) / 512);
	case BLKGETSIZE:
		size = i_size_read(bdev->bd_inode);
		if ((size >> 9) > ~0UL)
			return -EFBIG;
		return compat_put_ulong(argp, size >> 9);

	/* The data is compatible, but the command number is different */
	case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
		return put_int(argp, bdev_logical_block_size(bdev));
	case BLKBSZSET_32:
		return blkdev_bszset(bdev, mode, argp);
	case BLKGETSIZE64_32:
		return put_u64(argp, i_size_read(bdev->bd_inode));

	/* Incompatible alignment on i386 */
	case BLKTRACESETUP32:
		return blk_trace_ioctl(bdev, cmd, argp);
	default:
		break;
	}

	ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
	if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
		ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);

	return ret;
}
#endif
Commit	Line	Data
3dcf60bc	1	// SPDX-License-Identifier: GPL-2.0
c59ede7b	2	#include <linux/capability.h>
ee6a129d	3	#include <linux/compat.h>
1da177e4	4	#include <linux/blkdev.h>
d5decd3b	5	#include <linux/export.h>
5a0e3ad6	6	#include <linux/gfp.h>
1da177e4	7	#include <linux/blkpg.h>
a885c8c4	8	#include <linux/hdreg.h>
1da177e4	9	#include <linux/backing-dev.h>
ff01bb48	10	#include <linux/fs.h>
2056a782	11	#include <linux/blktrace_api.h>
bbd3e064	12	#include <linux/pr.h>
7c0f6ba6	13	#include <linux/uaccess.h>
581e2600	14	#include "blk.h"
1da177e4	15
5fb889f5 AB	16	static int blkpg_do_ioctl(struct block_device *bdev,
5fb889f5 AB	17	struct blkpg_partition __user *upart, int op)
1da177e4	18	{
1da177e4 LT	19	struct blkpg_partition p;
1da177e4 LT	20	long long start, length;
1da177e4 LT	21
	22	if (!capable(CAP_SYS_ADMIN))
	23	return -EACCES;
5fb889f5	24	if (copy_from_user(&p, upart, sizeof(struct blkpg_partition)))
1da177e4	25	return -EFAULT;
fa01b1e9	26	if (bdev_is_partition(bdev))
1da177e4	27	return -EINVAL;
88e34126	28
fa9156ae CH	29	if (p.pno <= 0)
fa9156ae CH	30	return -EINVAL;
e71bf0d0	31
fa9156ae CH	32	if (op == BLKPG_DEL_PARTITION)
fa9156ae CH	33	return bdev_del_partition(bdev, p.pno);
e71bf0d0	34
fa9156ae CH	35	start = p.start >> SECTOR_SHIFT;
fa9156ae CH	36	length = p.length >> SECTOR_SHIFT;
e71bf0d0	37
fa9156ae CH	38	switch (op) {
	39	case BLKPG_ADD_PARTITION:
	40	/* check if partition is aligned to blocksize */
	41	if (p.start & (bdev_logical_block_size(bdev) - 1))
1da177e4	42	return -EINVAL;
fa9156ae CH	43	return bdev_add_partition(bdev, p.pno, start, length);
	44	case BLKPG_RESIZE_PARTITION:
	45	return bdev_resize_partition(bdev, p.pno, start, length);
	46	default:
	47	return -EINVAL;
1da177e4 LT	48	}
	49	}
	50
5fb889f5 AB	51	static int blkpg_ioctl(struct block_device *bdev,
	52	struct blkpg_ioctl_arg __user *arg)
	53	{
	54	struct blkpg_partition __user *udata;
	55	int op;
	56
	57	if (get_user(op, &arg->op) \|\| get_user(udata, &arg->data))
	58	return -EFAULT;
	59
	60	return blkpg_do_ioctl(bdev, udata, op);
	61	}
	62
	63	#ifdef CONFIG_COMPAT
	64	struct compat_blkpg_ioctl_arg {
	65	compat_int_t op;
	66	compat_int_t flags;
	67	compat_int_t datalen;
	68	compat_caddr_t data;
	69	};
	70
	71	static int compat_blkpg_ioctl(struct block_device *bdev,
	72	struct compat_blkpg_ioctl_arg __user *arg)
	73	{
	74	compat_caddr_t udata;
	75	int op;
	76
	77	if (get_user(op, &arg->op) \|\| get_user(udata, &arg->data))
	78	return -EFAULT;
	79
	80	return blkpg_do_ioctl(bdev, compat_ptr(udata), op);
	81	}
	82	#endif
	83
4601b4b1	84	static int blkdev_reread_part(struct block_device *bdev, fmode_t mode)
1da177e4	85	{
4601b4b1	86	struct block_device *tmp;
f0b870df	87
fa01b1e9	88	if (!disk_part_scan_enabled(bdev->bd_disk) \|\| bdev_is_partition(bdev))
1da177e4 LT	89	return -EINVAL;
	90	if (!capable(CAP_SYS_ADMIN))
	91	return -EACCES;
ab4b5705	92	if (bdev->bd_disk->open_partitions)
68e6582e	93	return -EBUSY;
be324177	94
4601b4b1 CH	95	/*
	96	* Reopen the device to revalidate the driver state and force a
	97	* partition rescan.
	98	*/
	99	mode &= ~FMODE_EXCL;
	100	set_bit(GD_NEED_PART_SCAN, &bdev->bd_disk->state);
be324177	101
4601b4b1 CH	102	tmp = blkdev_get_by_dev(bdev->bd_dev, mode, NULL);
	103	if (IS_ERR(tmp))
	104	return PTR_ERR(tmp);
	105	blkdev_put(tmp, mode);
	106	return 0;
1da177e4 LT	107	}
1da177e4 LT	108
d8e4bb81 CH	109	static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode,
d8e4bb81 CH	110	unsigned long arg, unsigned long flags)
d30a2605	111	{
d8e4bb81 CH	112	uint64_t range[2];
d8e4bb81 CH	113	uint64_t start, len;
351499a1	114	struct request_queue *q = bdev_get_queue(bdev);
384d87ef	115	int err;
d8e4bb81 CH	116
	117	if (!(mode & FMODE_WRITE))
	118	return -EBADF;
	119
351499a1 DM	120	if (!blk_queue_discard(q))
	121	return -EOPNOTSUPP;
	122
d8e4bb81 CH	123	if (copy_from_user(range, (void __user *)arg, sizeof(range)))
	124	return -EFAULT;
	125
	126	start = range[0];
	127	len = range[1];
8d57a98c	128
d30a2605 DW	129	if (start & 511)
	130	return -EINVAL;
	131	if (len & 511)
	132	return -EINVAL;
d30a2605	133
351499a1	134	if (start + len > i_size_read(bdev->bd_inode))
d30a2605	135	return -EINVAL;
384d87ef JK	136
	137	err = truncate_bdev_range(bdev, mode, start, start + len - 1);
	138	if (err)
	139	return err;
	140
351499a1 DM	141	return blkdev_issue_discard(bdev, start >> 9, len >> 9,
351499a1 DM	142	GFP_KERNEL, flags);
d30a2605 DW	143	}
d30a2605 DW	144
d8e4bb81 CH	145	static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode,
d8e4bb81 CH	146	unsigned long arg)
66ba32dc	147	{
d8e4bb81	148	uint64_t range[2];
22dd6d35	149	uint64_t start, end, len;
384d87ef	150	int err;
d8e4bb81 CH	151
	152	if (!(mode & FMODE_WRITE))
	153	return -EBADF;
	154
	155	if (copy_from_user(range, (void __user *)arg, sizeof(range)))
	156	return -EFAULT;
	157
	158	start = range[0];
	159	len = range[1];
22dd6d35	160	end = start + len - 1;
d8e4bb81	161
66ba32dc MP	162	if (start & 511)
	163	return -EINVAL;
	164	if (len & 511)
	165	return -EINVAL;
22dd6d35 DW	166	if (end >= (uint64_t)i_size_read(bdev->bd_inode))
	167	return -EINVAL;
	168	if (end < start)
66ba32dc MP	169	return -EINVAL;
66ba32dc MP	170
22dd6d35	171	/* Invalidate the page cache, including dirty pages */
384d87ef JK	172	err = truncate_bdev_range(bdev, mode, start, end);
	173	if (err)
	174	return err;
22dd6d35 DW	175
22dd6d35 DW	176	return blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL,
ee472d83	177	BLKDEV_ZERO_NOUNMAP);
66ba32dc MP	178	}
66ba32dc MP	179
9b81648c	180	static int put_ushort(unsigned short __user *argp, unsigned short val)
1da177e4	181	{
9b81648c	182	return put_user(val, argp);
1da177e4 LT	183	}
1da177e4 LT	184
9b81648c	185	static int put_int(int __user *argp, int val)
1da177e4	186	{
9b81648c	187	return put_user(val, argp);
1da177e4 LT	188	}
1da177e4 LT	189
9b81648c	190	static int put_uint(unsigned int __user *argp, unsigned int val)
ac481c20	191	{
9b81648c	192	return put_user(val, argp);
ac481c20 MP	193	}
ac481c20 MP	194
9b81648c	195	static int put_long(long __user *argp, long val)
1da177e4	196	{
9b81648c	197	return put_user(val, argp);
1da177e4 LT	198	}
1da177e4 LT	199
9b81648c	200	static int put_ulong(unsigned long __user *argp, unsigned long val)
1da177e4	201	{
9b81648c	202	return put_user(val, argp);
1da177e4 LT	203	}
1da177e4 LT	204
9b81648c	205	static int put_u64(u64 __user *argp, u64 val)
1da177e4	206	{
9b81648c	207	return put_user(val, argp);
1da177e4 LT	208	}
1da177e4 LT	209
bdc1ddad	210	#ifdef CONFIG_COMPAT
c8210a57	211	static int compat_put_long(compat_long_t __user *argp, long val)
bdc1ddad	212	{
9b81648c	213	return put_user(val, argp);
bdc1ddad AB	214	}
bdc1ddad AB	215
c8210a57	216	static int compat_put_ulong(compat_ulong_t __user *argp, compat_ulong_t val)
bdc1ddad	217	{
9b81648c	218	return put_user(val, argp);
bdc1ddad AB	219	}
	220	#endif
	221
ee6a129d AB	222	#ifdef CONFIG_COMPAT
	223	/*
	224	* This is the equivalent of compat_ptr_ioctl(), to be used by block
	225	* drivers that implement only commands that are completely compatible
	226	* between 32-bit and 64-bit user space
	227	*/
	228	int blkdev_compat_ptr_ioctl(struct block_device *bdev, fmode_t mode,
	229	unsigned cmd, unsigned long arg)
	230	{
	231	struct gendisk *disk = bdev->bd_disk;
	232
	233	if (disk->fops->ioctl)
	234	return disk->fops->ioctl(bdev, mode, cmd,
	235	(unsigned long)compat_ptr(arg));
	236
	237	return -ENOIOCTLCMD;
	238	}
	239	EXPORT_SYMBOL(blkdev_compat_ptr_ioctl);
	240	#endif
	241
bbd3e064 CH	242	static int blkdev_pr_register(struct block_device *bdev,
	243	struct pr_registration __user *arg)
	244	{
	245	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
	246	struct pr_registration reg;
	247
	248	if (!capable(CAP_SYS_ADMIN))
	249	return -EPERM;
	250	if (!ops \|\| !ops->pr_register)
	251	return -EOPNOTSUPP;
	252	if (copy_from_user(&reg, arg, sizeof(reg)))
	253	return -EFAULT;
	254
	255	if (reg.flags & ~PR_FL_IGNORE_KEY)
	256	return -EOPNOTSUPP;
	257	return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags);
	258	}
	259
	260	static int blkdev_pr_reserve(struct block_device *bdev,
	261	struct pr_reservation __user *arg)
	262	{
	263	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
	264	struct pr_reservation rsv;
	265
	266	if (!capable(CAP_SYS_ADMIN))
	267	return -EPERM;
	268	if (!ops \|\| !ops->pr_reserve)
	269	return -EOPNOTSUPP;
	270	if (copy_from_user(&rsv, arg, sizeof(rsv)))
	271	return -EFAULT;
	272
	273	if (rsv.flags & ~PR_FL_IGNORE_KEY)
	274	return -EOPNOTSUPP;
	275	return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags);
	276	}
	277
	278	static int blkdev_pr_release(struct block_device *bdev,
	279	struct pr_reservation __user *arg)
	280	{
	281	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
	282	struct pr_reservation rsv;
	283
	284	if (!capable(CAP_SYS_ADMIN))
	285	return -EPERM;
	286	if (!ops \|\| !ops->pr_release)
	287	return -EOPNOTSUPP;
	288	if (copy_from_user(&rsv, arg, sizeof(rsv)))
	289	return -EFAULT;
	290
	291	if (rsv.flags)
	292	return -EOPNOTSUPP;
	293	return ops->pr_release(bdev, rsv.key, rsv.type);
	294	}
	295
	296	static int blkdev_pr_preempt(struct block_device *bdev,
	297	struct pr_preempt __user *arg, bool abort)
	298	{
	299	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
	300	struct pr_preempt p;
	301
	302	if (!capable(CAP_SYS_ADMIN))
	303	return -EPERM;
	304	if (!ops \|\| !ops->pr_preempt)
	305	return -EOPNOTSUPP;
306	if (copy_from_user(&p, arg, sizeof(p)))
307	return -EFAULT;
308
309	if (p.flags)
310	return -EOPNOTSUPP;
311	return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort);
312	}
313
314	static int blkdev_pr_clear(struct block_device *bdev,
315	struct pr_clear __user *arg)
316	{
317	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
318	struct pr_clear c;
319
320	if (!capable(CAP_SYS_ADMIN))
321	return -EPERM;
322	if (!ops \|\| !ops->pr_clear)
323	return -EOPNOTSUPP;
324	if (copy_from_user(&c, arg, sizeof(c)))
325	return -EFAULT;
326
327	if (c.flags)
328	return -EOPNOTSUPP;
329	return ops->pr_clear(bdev, c.key);
330	}
331
d8e4bb81 CH	332	static int blkdev_flushbuf(struct block_device *bdev, fmode_t mode,
d8e4bb81 CH	333	unsigned cmd, unsigned long arg)
bb93e3a5	334	{
d8e4bb81 CH	335	if (!capable(CAP_SYS_ADMIN))
d8e4bb81 CH	336	return -EACCES;
d8e4bb81 CH	337	fsync_bdev(bdev);
	338	invalidate_bdev(bdev);
	339	return 0;
	340	}
d30a2605	341
d8e4bb81 CH	342	static int blkdev_roset(struct block_device *bdev, fmode_t mode,
	343	unsigned cmd, unsigned long arg)
	344	{
	345	int ret, n;
d30a2605	346
bb749b31 ID	347	if (!capable(CAP_SYS_ADMIN))
	348	return -EACCES;
	349
d8e4bb81 CH	350	if (get_user(n, (int __user *)arg))
d8e4bb81 CH	351	return -EFAULT;
e00adcad CH	352	if (bdev->bd_disk->fops->set_read_only) {
	353	ret = bdev->bd_disk->fops->set_read_only(bdev, n);
	354	if (ret)
	355	return ret;
	356	}
83950d35	357	bdev->bd_read_only = n;
d8e4bb81 CH	358	return 0;
d8e4bb81 CH	359	}
d30a2605	360
d8e4bb81 CH	361	static int blkdev_getgeo(struct block_device *bdev,
	362	struct hd_geometry __user *argp)
	363	{
	364	struct gendisk *disk = bdev->bd_disk;
	365	struct hd_geometry geo;
	366	int ret;
d30a2605	367
d8e4bb81 CH	368	if (!argp)
	369	return -EINVAL;
	370	if (!disk->fops->getgeo)
	371	return -ENOTTY;
	372
	373	/*
	374	* We need to set the startsect first, the driver may
	375	* want to override it.
	376	*/
	377	memset(&geo, 0, sizeof(geo));
	378	geo.start = get_start_sect(bdev);
	379	ret = disk->fops->getgeo(bdev, &geo);
	380	if (ret)
	381	return ret;
	382	if (copy_to_user(argp, &geo, sizeof(geo)))
	383	return -EFAULT;
	384	return 0;
	385	}
66ba32dc	386
bdc1ddad AB	387	#ifdef CONFIG_COMPAT
	388	struct compat_hd_geometry {
	389	unsigned char heads;
	390	unsigned char sectors;
	391	unsigned short cylinders;
	392	u32 start;
	393	};
	394
9b81648c AB	395	static int compat_hdio_getgeo(struct block_device *bdev,
9b81648c AB	396	struct compat_hd_geometry __user *ugeo)
bdc1ddad	397	{
9b81648c	398	struct gendisk *disk = bdev->bd_disk;
bdc1ddad AB	399	struct hd_geometry geo;
	400	int ret;
	401
	402	if (!ugeo)
	403	return -EINVAL;
	404	if (!disk->fops->getgeo)
	405	return -ENOTTY;
	406
	407	memset(&geo, 0, sizeof(geo));
	408	/*
	409	* We need to set the startsect first, the driver may
	410	* want to override it.
	411	*/
	412	geo.start = get_start_sect(bdev);
	413	ret = disk->fops->getgeo(bdev, &geo);
	414	if (ret)
	415	return ret;
	416
	417	ret = copy_to_user(ugeo, &geo, 4);
	418	ret \|= put_user(geo.start, &ugeo->start);
	419	if (ret)
	420	ret = -EFAULT;
	421
	422	return ret;
	423	}
	424	#endif
	425
d8e4bb81 CH	426	/* set the logical block size */
	427	static int blkdev_bszset(struct block_device *bdev, fmode_t mode,
	428	int __user *argp)
	429	{
	430	int ret, n;
66ba32dc	431
d8e4bb81 CH	432	if (!capable(CAP_SYS_ADMIN))
	433	return -EACCES;
	434	if (!argp)
	435	return -EINVAL;
	436	if (get_user(n, argp))
	437	return -EFAULT;
66ba32dc	438
47816282 CH	439	if (mode & FMODE_EXCL)
47816282 CH	440	return set_blocksize(bdev, n);
d30a2605	441
47816282 CH	442	if (IS_ERR(blkdev_get_by_dev(bdev->bd_dev, mode \| FMODE_EXCL, &bdev)))
47816282 CH	443	return -EBUSY;
d8e4bb81	444	ret = set_blocksize(bdev, n);
47816282 CH	445	blkdev_put(bdev, mode \| FMODE_EXCL);
47816282 CH	446
d8e4bb81 CH	447	return ret;
d8e4bb81 CH	448	}
a885c8c4	449
d8e4bb81	450	/*
9b81648c AB	451	* Common commands that are handled the same way on native and compat
	452	* user space. Note the separate arg/argp parameters that are needed
	453	* to deal with the compat_ptr() conversion.
d8e4bb81	454	*/
9b81648c AB	455	static int blkdev_common_ioctl(struct block_device *bdev, fmode_t mode,
9b81648c AB	456	unsigned cmd, unsigned long arg, void __user *argp)
d8e4bb81	457	{
d8e4bb81 CH	458	unsigned int max_sectors;
	459
	460	switch (cmd) {
	461	case BLKFLSBUF:
	462	return blkdev_flushbuf(bdev, mode, cmd, arg);
	463	case BLKROSET:
	464	return blkdev_roset(bdev, mode, cmd, arg);
	465	case BLKDISCARD:
	466	return blk_ioctl_discard(bdev, mode, arg, 0);
	467	case BLKSECDISCARD:
	468	return blk_ioctl_discard(bdev, mode, arg,
	469	BLKDEV_DISCARD_SECURE);
	470	case BLKZEROOUT:
	471	return blk_ioctl_zeroout(bdev, mode, arg);
3ed05a98 ST	472	case BLKREPORTZONE:
	473	return blkdev_report_zones_ioctl(bdev, mode, cmd, arg);
	474	case BLKRESETZONE:
e876df1f AJ	475	case BLKOPENZONE:
	476	case BLKCLOSEZONE:
	477	case BLKFINISHZONE:
	478	return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg);
72cd8757	479	case BLKGETZONESZ:
9b81648c	480	return put_uint(argp, bdev_zone_sectors(bdev));
65e4e3ee	481	case BLKGETNRZONES:
9b81648c	482	return put_uint(argp, blkdev_nr_zones(bdev->bd_disk));
45048d09	483	case BLKROGET:
9b81648c	484	return put_int(argp, bdev_read_only(bdev) != 0);
ac481c20	485	case BLKSSZGET: /* get block device logical block size */
9b81648c	486	return put_int(argp, bdev_logical_block_size(bdev));
ac481c20	487	case BLKPBSZGET: /* get block device physical block size */
9b81648c	488	return put_uint(argp, bdev_physical_block_size(bdev));
ac481c20	489	case BLKIOMIN:
9b81648c	490	return put_uint(argp, bdev_io_min(bdev));
ac481c20	491	case BLKIOOPT:
9b81648c	492	return put_uint(argp, bdev_io_opt(bdev));
ac481c20	493	case BLKALIGNOFF:
9b81648c	494	return put_int(argp, bdev_alignment_offset(bdev));
98262f27	495	case BLKDISCARDZEROES:
9b81648c	496	return put_uint(argp, 0);
45048d09	497	case BLKSECTGET:
63f26496 AM	498	max_sectors = min_t(unsigned int, USHRT_MAX,
63f26496 AM	499	queue_max_sectors(bdev_get_queue(bdev)));
9b81648c	500	return put_ushort(argp, max_sectors);
ef00f59c	501	case BLKROTATIONAL:
9b81648c	502	return put_ushort(argp, !blk_queue_nonrot(bdev_get_queue(bdev)));
45048d09 AV	503	case BLKRASET:
	504	case BLKFRASET:
	505	if(!capable(CAP_SYS_ADMIN))
	506	return -EACCES;
efa7c9f9	507	bdev->bd_bdi->ra_pages = (arg * 512) / PAGE_SIZE;
45048d09	508	return 0;
45048d09	509	case BLKRRPART:
4601b4b1	510	return blkdev_reread_part(bdev, mode);
45048d09 AV	511	case BLKTRACESTART:
45048d09 AV	512	case BLKTRACESTOP:
45048d09	513	case BLKTRACETEARDOWN:
d8e4bb81	514	return blk_trace_ioctl(bdev, cmd, argp);
bbd3e064 CH	515	case IOC_PR_REGISTER:
	516	return blkdev_pr_register(bdev, argp);
	517	case IOC_PR_RESERVE:
	518	return blkdev_pr_reserve(bdev, argp);
	519	case IOC_PR_RELEASE:
	520	return blkdev_pr_release(bdev, argp);
	521	case IOC_PR_PREEMPT:
	522	return blkdev_pr_preempt(bdev, argp, false);
	523	case IOC_PR_PREEMPT_ABORT:
	524	return blkdev_pr_preempt(bdev, argp, true);
	525	case IOC_PR_CLEAR:
	526	return blkdev_pr_clear(bdev, argp);
45048d09	527	default:
9b81648c	528	return -ENOIOCTLCMD;
45048d09	529	}
1da177e4	530	}
9b81648c AB	531
	532	/*
	533	* Always keep this in sync with compat_blkdev_ioctl()
	534	* to handle all incompatible commands in both functions.
	535	*
	536	* New commands must be compatible and go into blkdev_common_ioctl
	537	*/
	538	int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
	539	unsigned long arg)
	540	{
	541	int ret;
	542	loff_t size;
	543	void __user argp = (void __user )arg;
	544
	545	switch (cmd) {
	546	/* These need separate implementations for the data structure */
	547	case HDIO_GETGEO:
	548	return blkdev_getgeo(bdev, argp);
	549	case BLKPG:
	550	return blkpg_ioctl(bdev, argp);
	551
	552	/* Compat mode returns 32-bit data instead of 'long' */
	553	case BLKRAGET:
	554	case BLKFRAGET:
	555	if (!argp)
	556	return -EINVAL;
	557	return put_long(argp, (bdev->bd_bdi->ra_pages*PAGE_SIZE) / 512);
	558	case BLKGETSIZE:
	559	size = i_size_read(bdev->bd_inode);
	560	if ((size >> 9) > ~0UL)
	561	return -EFBIG;
	562	return put_ulong(argp, size >> 9);
	563
	564	/* The data is compatible, but the command number is different */
	565	case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
	566	return put_int(argp, block_size(bdev));
	567	case BLKBSZSET:
	568	return blkdev_bszset(bdev, mode, argp);
	569	case BLKGETSIZE64:
	570	return put_u64(argp, i_size_read(bdev->bd_inode));
	571
	572	/* Incompatible alignment on i386 */
	573	case BLKTRACESETUP:
	574	return blk_trace_ioctl(bdev, cmd, argp);
	575	default:
	576	break;
	577	}
	578
	579	ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
a7cb3d2f CH	580	if (ret != -ENOIOCTLCMD)
a7cb3d2f CH	581	return ret;
9b81648c	582
a7cb3d2f CH	583	if (!bdev->bd_disk->fops->ioctl)
	584	return -ENOTTY;
	585	return bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg);
9b81648c AB	586	}
9b81648c AB	587	EXPORT_SYMBOL_GPL(blkdev_ioctl); /* for /dev/raw */
bdc1ddad AB	588
bdc1ddad AB	589	#ifdef CONFIG_COMPAT
9b81648c	590
bdc1ddad AB	591	#define BLKBSZGET_32 _IOR(0x12, 112, int)
	592	#define BLKBSZSET_32 _IOW(0x12, 113, int)
	593	#define BLKGETSIZE64_32 _IOR(0x12, 114, int)
	594
	595	/* Most of the generic ioctls are handled in the normal fallback path.
	596	This assumes the blkdev's low level compat_ioctl always returns
	597	ENOIOCTLCMD for unknown ioctls. */
	598	long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
	599	{
9b81648c AB	600	int ret;
9b81648c AB	601	void __user *argp = compat_ptr(arg);
4e7b5671	602	struct block_device *bdev = I_BDEV(file->f_mapping->host);
bdc1ddad AB	603	struct gendisk *disk = bdev->bd_disk;
	604	fmode_t mode = file->f_mode;
	605	loff_t size;
bdc1ddad AB	606
	607	/*
	608	* O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
	609	* to updated it before every ioctl.
	610	*/
	611	if (file->f_flags & O_NDELAY)
	612	mode \|= FMODE_NDELAY;
	613	else
	614	mode &= ~FMODE_NDELAY;
	615
	616	switch (cmd) {
9b81648c	617	/* These need separate implementations for the data structure */
bdc1ddad	618	case HDIO_GETGEO:
9b81648c	619	return compat_hdio_getgeo(bdev, argp);
bdc1ddad	620	case BLKPG:
9b81648c AB	621	return compat_blkpg_ioctl(bdev, argp);
	622
	623	/* Compat mode returns 32-bit data instead of 'long' */
bdc1ddad AB	624	case BLKRAGET:
bdc1ddad AB	625	case BLKFRAGET:
9b81648c	626	if (!argp)
bdc1ddad	627	return -EINVAL;
9b81648c	628	return compat_put_long(argp,
bdc1ddad	629	(bdev->bd_bdi->ra_pages * PAGE_SIZE) / 512);
bdc1ddad AB	630	case BLKGETSIZE:
	631	size = i_size_read(bdev->bd_inode);
	632	if ((size >> 9) > ~0UL)
	633	return -EFBIG;
9b81648c	634	return compat_put_ulong(argp, size >> 9);
bdc1ddad	635
9b81648c AB	636	/* The data is compatible, but the command number is different */
	637	case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
	638	return put_int(argp, bdev_logical_block_size(bdev));
	639	case BLKBSZSET_32:
	640	return blkdev_bszset(bdev, mode, argp);
bdc1ddad	641	case BLKGETSIZE64_32:
9b81648c	642	return put_u64(argp, i_size_read(bdev->bd_inode));
bdc1ddad	643
9b81648c	644	/* Incompatible alignment on i386 */
bdc1ddad	645	case BLKTRACESETUP32:
9b81648c	646	return blk_trace_ioctl(bdev, cmd, argp);
bdc1ddad	647	default:
9b81648c	648	break;
bdc1ddad	649	}
9b81648c AB	650
	651	ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
	652	if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
	653	ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
	654
	655	return ret;
bdc1ddad AB	656	}
bdc1ddad AB	657	#endif