compat_blkpg_ioctl

Name:compat_blkpg_ioctl

Proto:static int compat_blkpg_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, struct compat_blkpg_ioctl_arg __user *ua32)

Type:int

Parameter:

Type	Parameter	Name
struct block_device *	bdev
fmode_t	mode
unsigned int	cmd
struct compat_blkpg_ioctl_arg __user *	ua32

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__user * a = 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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err = Get a simple variable from user space(n, & op)

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err |= Write a simple value into user space(n, & op)

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err |= Get a simple variable from user space(n, & flags)

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err |= Write a simple value into user space(n, & flags)

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err |= Get a simple variable from user space(n, & datalen)

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err |= Write a simple value into user space(n, & datalen)

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err |= Get a simple variable from user space(udata, & data)

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err |= Write a simple value into user space(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., & data)

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If err Then Return err

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Return always keep this in sync with compat_blkdev_ioctl()

**Caller**
Name	Describe
compat_blkdev_ioctl	Most of the generic ioctls are handled in the normal fallback path.This assumes the blkdev's low level compat_ioctl always returnsENOIOCTLCMD for unknown ioctls.

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