block: Convert open calls to qemu_open
This patch converts all block layer open calls to qemu_open. Note that this adds the O_CLOEXEC flag to the changed open paths when the O_CLOEXEC macro is defined. Signed-off-by: NCorey Bryant <coreyb@linux.vnet.ibm.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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