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nbd/client: Initial support for extended headers
Update the client code to be able to send an extended request, and parse an extended header from the server. Note that since we reject any structured reply with a too-large payload, we can always normalize a valid header back into the compact form, so that the caller need not deal with two branches of a union. Still, until a later patch lets the client negotiate extended headers, the code added here should not be reached. Note that because of the different magic numbers, it is just as easy to trace and then tolerate a non-compliant server sending the wrong header reply as it would be to insist that the server is compliant. Signed-off-by: Eric Blake <eblake@redhat.com> Message-ID: <20230925192229.3186470-21-eblake@redhat.com> [eblake: fix trace format] Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
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4 changed files with 74 additions and 38 deletions
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@ -389,7 +389,8 @@ int nbd_init(int fd, QIOChannelSocket *sioc, NBDExportInfo *info,
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Error **errp);
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int nbd_send_request(QIOChannel *ioc, NBDRequest *request);
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int coroutine_fn nbd_receive_reply(BlockDriverState *bs, QIOChannel *ioc,
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NBDReply *reply, Error **errp);
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NBDReply *reply, NBDMode mode,
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Error **errp);
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int nbd_client(int fd);
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int nbd_disconnect(int fd);
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int nbd_errno_to_system_errno(int err);
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