On Fri, Feb 09 2007, Douglas Gilbert wrote: > Mike Christie wrote: > > sg duplicates a lot of block layer dio and copying code. The block layer > > is missing some things like mmap helpers and a way to support sg and > > st's reserve buffer. The next two patches move move functionality from > > sg to the block layer so later st and osst can use it, and then coverts > > sg to use the block layer helper. > > > > The goal is to kill scsi_execute_async and friends and covert the ULDs > > to use the block layer functions directly. This is nice because > > scsi_execute_async sucks and it actually duplicates block layer code, > > and in the end the scsi layer does not have to do any bio processing > > (which irks Jens :)), and we have common code for all ULDs. > > > > The patches were made over Jens's bsg branch in his block layer git tree > > on kernel.org. Sorry for the large patches. The sg conversion patch rips > > out alot of code duplicated in the block layer and the patch to add some > > missing functionality to the block layer has conversions to bsg, tgt, > > etc so git bisect works on it. > > Mike, > Might I suggest ripping all the scatter gather list > handling out of the block layer and putting it in > a library (a bit like libata). That way when the > block layer paradigm doesn't apply, we don't lose > all the useful things that have been put in there. Don't think block layer, think block IO helpers. That's essentially what large parts of the block layer is. -- Jens Axboe - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
