[mirror_ubuntu-jammy-kernel.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;

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