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Our backing file chain code was not very robust to an ill-timed EINTR, which could lead to a short read causing us to randomly treat metadata differently than usual. But the existing virFileReadLimFD forces an error if we don't read the entire file, even though we only care about the header of the file. So add a new virFile function that does what we want. * src/util/virfile.h (virFileReadHeaderFD): New prototype. * src/util/virfile.c (virFileReadHeaderFD): New function. * src/libvirt_private.syms (virfile.h): Export it. * src/util/virstoragefile.c (virStorageFileGetMetadataInternal) (virStorageFileProbeFormatFromFD): Use it. Signed-off-by: Eric Blake <eblake@redhat.com> (cherry picked from commit 5327fad4f292e4f3f84884ffe158c492bf00519c) Conflicts: src/util/virstoragefile.c: OOM error reporting & buffer signedness
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>