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Externally, libnbd exposed the 64-bit opaque marker for each client NBD packet as the "cookie", because it was less confusing when contrasted with 'struct nbd_handle *' holding all libnbd state. It also avoids confusion between the noun 'handle' as a way to identify a packet and the verb 'handle' for reacting to things like signals. Upstream NBD changed their spec to favor the name "cookie" based on libnbd's recommendations[1], so we can do likewise. [1] https://github.com/NetworkBlockDevice/nbd/commit/ca4392eb2b Signed-off-by: Eric Blake <eblake@redhat.com> Message-ID: <20230608135653.2918540-6-eblake@redhat.com> [eblake: typo fix] Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>