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(+)
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2.14.3