SCSI passthrough bypasses the block layer and issues SCSI commands directly to the disk. This breaks write notifiers and dirty bitmaps, so that scsi-block devices cannot act as a mirror or backup source (and commit too, even though that shouldn't be possible at all in the lack of a backing file). This series adds op blockers for that purpose.
There is currently a blk_op_unblock but no blk_op_block, so patch 2 adds it. Paolo Paolo Bonzini (2): scsi: add unrealize method for SCSI devices scsi: add block job opblockers for scsi-block block/block-backend.c | 9 ++++++ hw/scsi/scsi-bus.c | 4 +++ hw/scsi/scsi-disk.c | 62 ++++++++++++++++++++++++++++++++++++++++++ include/hw/scsi/scsi.h | 1 + include/sysemu/block-backend.h | 1 + 5 files changed, 77 insertions(+) -- 2.14.3
