Kai Makisara wrote:
On Mon, 30 Jan 2006, Christoph Hellwig wrote:
This patch updates st to use scsi_execute instead of scsi_execute_async
for all scsi commands except the main I/O path. The advantage is that
these helpers do all the request tracking for these synchronous I/Os so
that there is no need for st_request structures. It also decouples
these helper scsi commands from the main tape buffer, allowing for an
easier switchover to the generic block request mapping routines for the
main I/O path later on.
I think the main tape buffer will stay for quite a long time. Using it has
the advantage that it is allocated using GFP_DMA if necessary. This is not
a problem if scsi_execute does bouncing somewhere if it needs to be done.
scsi_execute needs a blk_queue_bounce call.
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