This is a less hacky version of my first attempt: https://lists.gnu.org/archive/html/qemu-devel/2018-06/msg05993.html
The worst part of the hack (taking a semicolon-separated list of requests to hand the server) is completely dropped, the member field is renamed to reflect what it is doing, and I've added an iotests to help us in regression testing. I'd REALLY like to send a pull request before soft freeze (tomorrow morning is approaching fast!) that includes these patches, so that qemu 3.0 at least has experimental access to all the pieces needed for playing with incremental backups. Eric Blake (2): nbd/client: Add x-dirty-bitmap to query bitmap from server iotests: New test 223 for exporting dirty bitmap over NBD qapi/block-core.json | 7 ++- block/nbd-client.h | 1 + include/block/nbd.h | 1 + block/nbd-client.c | 3 + block/nbd.c | 10 +++- nbd/client.c | 4 +- tests/qemu-iotests/223 | 138 +++++++++++++++++++++++++++++++++++++++++++++ tests/qemu-iotests/223.out | 49 ++++++++++++++++ tests/qemu-iotests/group | 1 + 9 files changed, 209 insertions(+), 5 deletions(-) create mode 100755 tests/qemu-iotests/223 create mode 100644 tests/qemu-iotests/223.out -- 2.14.4
