this patch adds handling of BUSY status reponse from an iSCSI target. Currently, we fail with -EIO in case of SCSI_STATUS_BUSY while the obvious reaction would be to retry the operation after some time. The retry time is randomly choosen from a range with exponential growth increasing with each retry. This patch includes most of the changes by a an upcoming patch from Stefan Hajnoczi: iscsi: implement .bdrv_detach/attach_aio_context() because I also need the reference to the aio_context for the retry timer to work. I included the changes to maintain better mergeability. Signed-off-by: Peter Lieven <pl@kamp.de> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Read the documentation in qemu-doc.html or on http://wiki.qemu-project.org - QEMU team
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