In some cases there is a need to perform a special access pattern to a disk backend. This may be done by providing disk reading access to external readers. In this case there should be the ability to enable/disable the copy-on-read mode for the disk during VM runtime. By the moment, there is no such ability. The patch set adds qmp command to enable/disable the copy-on-read mode.
Denis Plotnikov (2): block: check for read-only on copy-on-read setting qmp: add block-set-copy-on-read command block.c | 4 +--- block/io.c | 10 ++++++++-- block/stream.c | 5 +++-- blockdev.c | 38 ++++++++++++++++++++++++++++++++++++++ include/block/block.h | 2 +- qapi/block-core.json | 20 ++++++++++++++++++++ 6 files changed, 71 insertions(+), 8 deletions(-) -- 2.17.0