> On 12 Dec 2016, at 20:43, Wouter Verhelst <w...@uter.be> wrote: > > +- `NBD_OPT_SET_META_CONTEXT` (11) > + > + Change the set of active metadata contexts. Issuing this command > + replaces all previously-set metadata contexts; clients must ensure > + that all metadata contexts they're interested in are selected with > + the final query that they sent. > + > + Data: > + - 32 bits, length of query > + - String, query to select metadata contexts. The syntax of this > + query is implementation-defined, except that it MUST start with a > + namespace. This namespace may be one of the following: > + - `base:`, for metadata contexts defined by this document; > + - `nbd-server:`, for metadata contexts defined by the > + implementation that accompanies this document (none > + currently); > + - `x-*:`, where `*` can be replaced by any random string not > + containing colons, for local experiments. This SHOULD NOT be > + used by metadata contexts that are expected to e widely used. > + - third-party implementations can register additional > + namespaces by simple request to the mailinglist.
Surely also we need to specify multiple queries? -- Alex Bligh
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