Refactor virFileIsCDROM to virFileCheckCDROM and now it could be used to
store cdrom status.

In libvirt, it gives general Input/Output error when reading a not ready
cdrom backend vol. This error should be replaced with warning just like the
warning of lacking backing file.

Han Han (2):
  util: Refactor virFileIsCDROM to virFileCheckCDROM
  storage: Improve error handling on cdrom backend

 src/libvirt_private.syms   |  2 +-
 src/qemu/qemu_domain.c     |  4 ++--
 src/storage/storage_util.c | 15 ++++++++++++-
 src/util/virfile.c         | 44 ++++++++++++++++++++++++++++++++------
 src/util/virfile.h         | 11 +++++++++-
 5 files changed, 65 insertions(+), 11 deletions(-)

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2.17.1