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    SubjectRe: MD/DM and barriers (was Re: [patch] ext2/3: document conditions when reliable operation is possible)
    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.)


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