FUJITA Tomonori wrote:
sum(sg) == rq->data_len is already broken; sg sends such requests (though it would be nice if it doesn't).
Actually, I think I was half wrong on that when you asked about scsi_debug. The scatterlist that sg.c uses is never seen by the block layer or scsi layer. It is just used as a container to hold segments. sg.c and st.c use their scatterlist to manage their preallocated pages/segments. When they pass it to scsi_execute_async, that function will create a request struct and add bios for the pages.
In 2.6.24 and below, sg.c will send a scatterlist length that does not match the IO length, and scsi_execute_async will goof up and send a rq->data_len that does not match the sum of the bios. That is what I was trying to fix in 2.6.24, but the patch got messed up. In 2.6.25-rc2 and above that is fixed and scsi_execute_async will catch sg.c doing this and set rq->data_len and the bio lengths correctly.
So hopefully that helps any fixes you might have planned. -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
