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From: Ivan Voras <ivoras@freebsd.org>
Subject: Re: Unmapped I/O
Date: Thu, 20 Dec 2012 11:49:18 +0100
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On 19/12/2012 14:54, Konstantin Belousov wrote:

> Besides not mapped buffers, not mapped BIOs are introduced, marked
> with the flag BIO_NOTMAPPED.  Unmapped buffers are directly translated
> to unmapped BIOs.  Geom providers may indicate an acceptance of the
> unmapped BIOs.  If provider does not handle unmapped i/o requests,
> geom now automatically establishes transient mapping for the i/o
> pages.

Hi,

Can you write up more details on what this means for GEOM developers:
what is to be gained / lost (on GEOM level) for existing GEOM classes,
and how to "indicate acceptance" for umapped BIOs?



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