On Thu, Mar 08, 2018 at 05:03:11PM -0600, Eric Blake wrote: > If we bump NBDKIT_API_VERSION, we have forcefully made older > nbdkit reject all plugins that opt to the newer API: > > $ nbdkit ./plugins/nbd/.libs/nbdkit-nbd-plugin.so --dump-plugin > nbdkit: ./plugins/nbd/.libs/nbdkit-nbd-plugin.so: plugin is incompatible with > this version of nbdkit (_api_version = 2) > > But with a bit of finesse, we can make opting in to FUA support > orthogonal to NBDKIT_API_VERSION, by introducing a new witness > level that the user controls, and by providing sane fallbacks > so that newer plugins correctly populate the fields expected by > older nbdkit. > > --- > v3: rework entirely, add new variable instead of NBDKIT_API_VERSION > > This patch is still RFC; if you like it, it's probably better to > rebase portions of this patch into the rest of the series, rather > than churning NBDKIT_API_VERSION temporarily to 2 and now back to 1
I do wonder if this patch is really worthwhile. Old nbdkit / new plugin is probably going to go untested in general, and therefore will just cause problems/complexity. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com Fedora Windows cross-compiler. Compile Windows programs, test, and build Windows installers. Over 100 libraries supported. http://fedoraproject.org/wiki/MinGW _______________________________________________ Libguestfs mailing list [email protected] https://www.redhat.com/mailman/listinfo/libguestfs
