[dm-devel] [RFC] File backed target for device-mapper

[Heinz J . Mauelshagen]

On Tue, Jul 22, 2003 at 10:58:44PM +0100, Alasdair G Kergon wrote:
> On Tue, Jul 22, 2003 at 11:17:39PM +0200, Christophe Saout wrote:
> > I just wrote a dm target uses a file as backend instead of another block
> > device.
> 
> Another suggestion:
> 
>   A target that always returns a block of zeros [or more generally,
>   some other repeating pattern e.g. if the read goes beyond the end
>   of your file - required to be multiple of sector size - it loops 
>   round to the beginning; writes get dropped]

Factoring out and tweaking the io error target mainly.

> 
> So you can easily create, for example a /dev/zero-like block device of
> arbitrary size, which might be useful for replacing a lost disk that
> contained a stripe if you want to read off the data from the other
> stripes at correct offsets.
> 
> Alasdair
> -- 
> agk at uk.sistina.com
> 
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-- 

Regards,
Heinz    -- The LVM Guy --

*** Software bugs are stupid.
    Nevertheless it needs not so stupid people to solve them ***

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Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Am Sonnenhang 11
                                                  56242 Marienrachdorf
                                                  Germany
Mauelshagen at Sistina.com                           +49 2626 141200
                                                       FAX 924446
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