Re: [PATCH 000 of 4] Change prototype for bi_end_io

From: Jens Axboe
Date: Thu Sep 27 2007 - 07:12:28 EST

On Thu, Sep 27 2007, NeilBrown wrote:
> Hi Jens,
> here are a few more patches from my set that makes various changes to bio
> submission and handling.
> These change the ->bi_end_io prototype so that
> 1/ no 'size' is passed
> 2/ there is no return value.
> The 'size' is not really of interest to any bi_end_io handler in existance.
> It is really only an internal detail to the "request" handling in ll_rw_blk
> and lower levels.
> The return value is completely unused.
> After these patches, ->bi_end_io is only ever called once per bio.
> Note that the last patch makes lots and lots of simple changes. I
> think I have found all the right places, but any recently added
> device drivers might still be using the old bi_end_io prototype.
> I'll grep again after these patches are in your tree.

Thanks Neil, this looks good! We get rid of the ability to do partial
completions. It's a nice concept in theory, but as you noted nobody uses
it. And most drivers only do real full completions anyway, so there's
little interest in supporting it.

> That patches are against linux-block as of an hour ago.

I had to shoe horn the patches a bit, they really should be on the
block-2.6.24 branch. But that's ok, even if you had done them against
that branch, I had to redo the barrier branch and the sglist stuff

Jens Axboe

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