On Wed, Jun 22, 2011 at 5:22 PM, RKK <kulkarni.ravi4@gmail.com> wrote:
Hi all , Im trying to implement a custom new storage protocl which uses SCSI for storage in Linux . I have been looking around for some files in the Linux SCSI subsystems to understand its three layered design. The idea is to develop a separate stack which will internally use SCSI . so to get started all i want to do is write a module(kernel space) which sends SCSI commands to target device and retrieve some information from it. any idea like to how to proceed and which are files/books that can help me in this regard. I'm reading SCSI SPC-4 and SBC-3 specifications .
Hi Ravi, Please have a look at files drivers/scsi/scsi_lib.c , drivers/scsi/scsi.c and drivers/scsi/scsi_scan.c, drivers/scsi/scsi_error.c scsi_scan.c contains the scsi discovery code. scsi_error.c contains the error recovery code ..
The main entry point function in scsi middle layer is scsi_request_fn () http://lxr.linux.no/#linux+v2.6.39/drivers/scsi/scsi_lib.c#L1481 Also look at function scsi_alloc_sdev () in http://lxr.linux.no/#linux+v2.6.39/drivers/scsi/scsi_scan.c#L238 .. Regards, Sumeet
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