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Re: [linux-lvm] Re: [PATCH] 2.5 version of device mapper submission



On Tue, Oct 15, 2002 at 10:21:52AM +0200, Jens Axboe wrote:
> On Mon, Oct 14 2002, Joe Thornber wrote:
> > 10.patch
> >   [Device-mapper]
> >   Add call to blk_queue_bounce() at the beginning of the request function.
> 
> What on earth for? I also see that you are setting BLK_BOUNCE_HIGH as
> the bounce limit unconditionally for your queue. Puzzled.

This is just me stupidly copying loop.c, already found out it doesn't
work.  Please ignore.

> When does dm even have to touch the data in the bio?

Tell me; if I'm splitting a bio using bio_clone, and then map the bio
to a driver that calls blk_queue_bounce.  How can I avoid the

        BUG_ON((*bio_orig)->bi_idx);

triggering ?  Or is bio_clone not to be used anymore ?

- Joe



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