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This patch drops se_subsystem_api->[write_cache,fua_write]_emulated flags set by viritual FILEIO/IBLOCK/RD_MCP backend drivers in favor of explict TRANSPORT_PLUGIN_PHBA_PDEV checks to know when to fail if userspace is attempting to set virtual emulation bits for an pSCSI (passthrough) backend device. Reported-by: Christoph Hellwig <hch@lst.de> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>