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O_DIRECT has stringent requirements. Rather than make lots of changes at each site that wants to use O_DIRECT, it is easier to offload the work through a helper process that mirrors the I/O between a pipe and the actual direct fd, so that the other end of the pipe no longer has to worry about constraints. Plus, if the kernel ever gains better posix_fadvise support, then we only have to touch a single file to let all callers benefit from a more efficient way to avoid file system caching. * src/util/virfile.h (virFileDirectFdFlag, virFileDirectFdNew) (virFileDirectFdClose, virFileDirectFdFree): New prototypes. * src/util/virdirect.c: Implement new wrapper object. * src/libvirt_private.syms (virfile.h): Export new symbols. * cfg.mk (useless_free_options): Add to list. * po/POTFILES.in: Add new translations.
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>