On Thu, Dec 17 2015, Shaohua Li wrote: > Add support for journal disk hot add/remove. Mostly trival checks in md > part. The raid5 part is a little tricky. For hot-remove, we can't wait > pending write as it's called from raid5d. The wait will cause deadlock. > We simplily fail the hot-remove. A hot-remove retry can success > eventually since if journal disk is faulty all pending write will be > failed and finish. For hot-add, since an array supporting journal but > without journal disk will be marked read-only, we are safe to hot add > journal without stopping IO (should be read IO, while journal only > handles write IO). This and previous patch both applied - thanks. (will push things out to for-next next later today I hope) NeilBrown
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