FUJITA Tomonori wrote:
On Mon, 07 Apr 2008 20:31:38 +0900
Tejun Heo <htejun@xxxxxxxxx> wrote:
FUJITA Tomonori wrote:
Maybe we need yet another flag indicating padding space
availability?
How about doing the exact same thing that the drain buffer does? We
can put pre-allocated buffer to a queue and save one sg entry for it.
Each sg entry should be aligned so extra sg doesn't really help or am I
missing something?
Sorry, please scratch the previous mail. I think that I misunderstood
what you meant.
The current code does padding only for requests that we call
__blk_rq_map_user (bio_copy_user) for. You meant that if we create a
new flag like REQ_NEED_PADDING and set it in blk_rq_map_user,
blk_rq_map_sg can do padding only when it was set.
Yeap, that's what I meant.
--
tejun
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