compat_hdio_ioctl

Name:compat_hdio_ioctl

Proto:static int compat_hdio_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg)

Type:int

Parameter:

Type	Parameter	Name
struct block_device *	bdev
fmode_t	mode
unsigned int	cmd
unsigned long	arg

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__user * p

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p = Allocate user-space memory for the duration of a single system call,* in order to marshall parameters inside a compat thunk.

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error = __blkdev_driver_ioctl(bdev, mode, cmd, (unsignedlong)p)

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If error == 0 Then

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__user * uvp = A pointer passed in from user mode. This should not* be used for syscall parameters, just declare them* as pointers because the syscall entry code will have* appropriately converted them already.

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If Get a simple variable from user space(v, p) || Write a simple value into user space(v, uvp) Then error = -EFAULT

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Return error

**Caller**
Name	Describe
compat_blkdev_driver_ioctl

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