Types of Devices
Streaming I/O and Device Drivers 7-47
Figure 7-12. Buffer Flow in a Terminating Device
Figure 7-13 shows the buffer flow of an in-place stacking driver. All data
processing is done in a single buffer. This is a relatively simple device, but it
is not as general-purpose as the copying stacking driver.
Figure 7-13. In-Place Stacking Driver
Current
Device
To/From Physical Device
fromdevice queue
todevice queue
Underlying
Device
fromdevice queue
todevice queue
ReclaimIssue
Current
Device
fromdevice queue
todevice queue
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