copyPhysicalExtent
Declaration
virtual IOStorage * copyPhysicalExtent(
IOService *client,
UInt64 *byteStart,
UInt64 *byteCount);Parameters
- client:
Client requesting the operation.
- byteStart:
Starting byte offset for the operation. Returns a physical byte offset, relative to the physical storage object, on success.
- byteCount:
Size of the operation. Returns the actual number of bytes which can be transferred, relative to the physical storage object, on success.
Return Value
A reference to the physical storage object, which should be released by the caller, or a null on error.
Overview
Convert the specified byte offset into a physical byte offset, relative to a physical storage object. This call should only be made within the context of lockPhysicalExtents().