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Next: The Scsi_Host Structure Up: Writing a SCSI Device Previous: Before You Begin: Gathering

The SCSI Interface

The high-level SCSI interface in the kernel manages all of the interaction between the kernel and the low-level SCSI device driver. Because of this layered design, a low-level SCSI driver need only provide a few basic services to the high-level code. The author of a low-level driver does not need to understand the intricacies of the kernel I/O system and, hence, can write a low-level driver in a relatively short amount of time.

Two main structures (Scsi_Host and Scsi_Cmnd) are used to communicate between the high-level code and the low-level code. The next two sections provide detailed information about these structures and the requirements of the low-level driver.

Converted on:
Mon Apr 1 10:20:16 EST 1996