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Date: Thu, 29 Aug 2013 10:43:55 +0800
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 btrfs raid5, The replace operation depends on scrub and makes use of the scrub code.
And scrub does not yet support RAID5/6. Therefore 'btrfs replace start'
fails with EINVAL on RAID5/6 filesystems.

when does the replace function is added? who can tell me the plan?