Re: [RFC PATCH 0/4] dm core: full barrier support

[Nikola Ciprich <extmaillist@linuxbox.cz>]

Hi,
and thanks for reply. OK, so I guess it might help if somebody (me:)) starts at least testing and commenting, right?
I'll install it on some of testing machines and report results.
br
nik

> No, there was no feedback.
> 
> Pushing it mainline depends on Alasdair's decision (maintainer of device-mapper).
> (It needs thorough review first and maybe better implementation.)
> 
> Milan
> --
> mbroz@redhat.com
> 
> 
> > thanks a lot in advance
> > BR
> > nik
> > 
> > On Tue, Jul 08, 2008 at 06:48:53PM +0200, Milan Broz wrote:
> >> Hi,
> >>
> >> there was several discussions about supporting barriers
> >> in device-mapper.
> >>
> >> I wrote this code some time ago, but it never reached dm-devel
> >> tree. Take this more like RFC and experimental approach
> >> - maybe there is better way how to handle it. 
> >> Anyway this implementation works in my tests and is relatively simple.
> >>
> >> [RFC PATCH 1/4] dm core: remove unused code
> >> 	- just remove never used code, already sent some time ago
> >> 	in another patchset
> >>
> >> [RFC PATCH 2/4] dm core: add support for empty barriers
> >> 	- the core implementation of empty barrier support
> >> 	- implementation for stripe target
> >>
> >> [RFC PATCH 3/4] dm core: add support for barrier bio with payload
> >> 	- tranform payload to sequence of data bio + empty barrier
> >>
> >> [RFC PATCH 4/4] dm core: wait for barrier in process in suspend
> >> 	- try to solve the problem that we cannot suspend device
> >> 	during processing of barrier.
> 

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