[dm-devel] [PATCH 0/2] Add suspended state check for target messages

[Mike Anderson]

Kiyoshi Ueda <k-ueda at ct.jp.nec.com> wrote:
> Hi Alasdair,
> 
> On 11/13/2009 11:19 PM +0900, Alasdair G Kergon wrote:
> > Would DMF_BLOCK_IO_FOR_SUSPEND work instead?
> 
> Maybe.
> But we must remember that using the flag means that multipath can't
> use message during flushing I/Os, although I'm not sure how it hurts us.
> 
> If we'd like to keep the ability to use message during flushing I/Os,
> we should use another flag for this purpose and set it after
> dm_wait_for_completion().
> 

I just re-rolled / re-submitted a update series that use a multipath
internal flag for the suspended state plus a mutex. This would avoid a
extended meaning for DMF_BLOCK_IO_FOR_SUSPEND if we needed to avoid that
case.

-andmike
--
Michael Anderson
andmike at linux.vnet.ibm.com