Messages in this thread | | | Date | Thu, 27 Aug 2009 19:09:42 +0100 | From | Alasdair G Kergon <> | Subject | Re: MD/DM and barriers (was Re: [patch] ext2/3: document conditions when reliable operation is possible) |
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On Thu, Aug 27, 2009 at 12:54:05PM -0400, Jeff Garzik wrote: > DM has some barrier code... but the above code was pasted from DM's > make_request function, so I am guessing that DM's barrier stuff is > incomplete and disabled at present.
That code is from the new request-based multipath implementation in 2.6.31 which doesn't yet.
But bio-based dm does support barriers now. (Just missing some patches to complete the dm-raid1 support that are still under review IIRC.)
Alasdair
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