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

[Mike Anderson <andmike linux vnet ibm com>]

Alasdair G Kergon <agk redhat com> wrote:
> Would DMF_BLOCK_IO_FOR_SUSPEND work instead?
> 

DMF_BLOCK_IO_FOR_SUSPEND appears to be a better choice, but since other
targets like dm-raid already have a internal suspend bit being used
unclear on the value of creating a generic accessor vs. just adding a
suspend atomic to the multipath target.

To close another window I believe we need a form of synchronization to
ensure a current multipath_message has completed prior to
multipath_postsuspend calling flush_multipath_work. Later
multipath_message calls would return without adding work if a bit check
indicated that we where suspended.

I will redo the patch(s) and resubmit.

-andmike
--
Michael Anderson
andmike linux vnet ibm com