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[dm-devel] Re: [PATCH RFC 0/4] use scatter lists for all block pc requests and simplify hw handlers



Jens Axboe wrote:
On Tue, Jun 07 2005, Michael Christie wrote:

Quoting James Bottomley <James Bottomley SteelEye com>:


On Tue, 2005-06-07 at 13:10 +0100, Christoph Hellwig wrote:

shouldn't blk_rq_map_kern handle a 0 buffer and do nothing more than
blk_get_request?  It's not exactly a criticial fastpath and that would make

life

easier for the callers.

Yes ... and it should probably do bio bouncing as well, since there's nothing special we have to do on completion to clean it up.

ok. I just made it like the existing blk_rq_map_user which made the caller do those things.


I agree with Christoph, makes it nicer for blk_rq_map_user as well. I'll
change the latter if you fix the former.

ok will do.


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