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由 Christoph Hellwig 提交于
This patches moves parsing of the GETDEVICEINFO XDR to kernel space, as well as the management of complex devices. The reason for that is we might have multiple outstanding complex devices after a NOTIFY_DEVICEID4_CHANGE, which device mapper or md can't handle as they claim devices exclusively. But as is turns out simple striping / concatenation is fairly trivial to implement anyway, so we make our life simpler by reducing the reliance on blkmapd. For now we still use blkmapd by feeding it synthetic SIMPLE device XDR to translate device signatures to device numbers, but in the long runs I have plans to eliminate it entirely. Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NTrond Myklebust <trond.myklebust@primarydata.com>
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