Messages in this thread | | | Date | Thu, 9 Apr 2009 11:28:51 +0100 | From | Alasdair G Kergon <> | Subject | Re: [dm-devel] Barriers still not passing on simple dm devices... |
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On Wed, Apr 08, 2009 at 09:27:20PM -0400, Chris Mason wrote: > I'm afraid expecting barriers forever in the future isn't completely > compatible with dm or md. Both of these allow the storage to change > over time, and the filesystem needs to handle this without corruptions.
The missing piece of the jigsaw is notification to upper layers *ahead* of such reconfigurations. (We have similar notification issues when devices are resized - the current approach is to leave the sysadmin responsible for co-ordinating changes through userspace.)
Alasdair -- agk@redhat.com
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