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Document and implement a new option that permits disk backends which would otherwise have to avoid O_DIRECT (because of the network memory lifetime bug) to use it anyway. This is: direct-io-safe in the xl domain disk config specification direct_io_safe in the libxl disk API direct-io-safe in the backend xenstore interface Add a reference to xen/include/public/io/blkif.h in docs/misc/vbd-interface.txt. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com> Acked-by: Ian Campbell <ian.campbell@citrix.com> Tested-by: Felipe Franciosi <felipe@paradoxo.org>