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    SubjectRe: clustered MD
    When a node fails, its dirty areas get special treatment from other nodes
    using the area_resyncing() function. Should the suspend_list be created
    before any reads or writes from the file system are processed by md? It
    seems to me that gfs journal recovery could read/write to dirty regions
    (from the failed node) before md was finished setting up the suspend_list.
    md could probably prevent that by using the recover_prep() dlm callback to
    set a flag that would block any i/o that arrived before the suspend_list
    was ready.



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