17.01.2019 22:36, Eric Blake wrote: > I got tired of debugging whether a server was advertising the > correct things during negotiation by inspecting the trace > logs of qemu-io as client - not to mention that without SOME > sort of client tracing particular commands, we can't easily > regression test the server for correct behavior. The final > straw was at KVM Forum, when Nir asked me to make sure there > was a way to easily determine if an NBD server is exposing what > we really want (and fixing x-dirty-bitmap to behave saner fell > out as a result of answering that question). > > I note that upstream NBD has 'nbd-client -l $host' for querying > just export names (with no quoting, so you have to know that > a blank line means the default export), but it wasn't powerful > enough, so I implemented 'qemu-nbd -L' to document everything. > Upstream NBD has separate 'nbd-client' and 'nbd-server' binaries, > while we only have 'qemu-nbd' (which is normally just a server, > but 'qemu-nbd -c' also operates a second thread as a client). > Our other uses of qemu as NBD client are for consuming a block > device (as in qemu-io, qemu-img, or a drive to qemu) - but those > binaries are less suited to something so specific to the NBD > protocol. > > Bonus: As a result of my work on this series, nbdkit now supports > NBD_OPT_INFO (my interoperability testing between server > implementations has been paying off, both at fixing server bugs, > and at making this code more reliable across difference in valid > servers). > > Also available at: > https://repo.or.cz/qemu/ericb.git qemu-nbd-list-v4 > > Currently based on master. > > Since v3: > - 1 new patch (1/21) > - split old patch 15/19 into two (16,17/21) > - retitle two patches (git backport-diff doesn't do too well at showing > the diff on a retitled patch; 5,11/21) > - fix review comments from Rich, Vladimir > > 001/21:[down] 'iotests: Make 233 output more reliable' > 002/21:[----] [--] 'maint: Allow for EXAMPLES in texi2pod' > 003/21:[----] [--] 'qemu-nbd: Enhance man page'
Interesting, I don't get it again. Searched in outlook online, I found only v2 of it, checked spam folder and filters. Magic. anyway, I can look at https://lists.gnu.org/archive/html/qemu-devel/2019-01/msg04328.html -- Best regards, Vladimir
