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author\"J. Bruce Fields\ <bfields@citi.umich.edu>2008-12-23 16:08:32 -0500
committerTrond Myklebust <Trond.Myklebust@netapp.com>2008-12-23 16:08:32 -0500
commitc381060869317b3c84430d4f54965d409cbfe65f (patch)
treeeca752e4fe61fd6e497fede253f83a01a36a365a /net/key
parentdb75b3d6b5b0dad29860370618ea94d2726641b4 (diff)
rpc: add an rpc_pipe_open method
We want to transition to a new gssd upcall which is text-based and more easily extensible. To simplify upgrades, as well as testing and debugging, it will help if we can upgrade gssd (to a version which understands the new upcall) without having to choose at boot (or module-load) time whether we want the new or the old upcall. We will do this by providing two different pipes: one named, as currently, after the mechanism (normally "krb5"), and supporting the old upcall. One named "gssd" and supporting the new upcall version. We allow gssd to indicate which version it supports by its choice of which pipe to open. As we have no interest in supporting *simultaneous* use of both versions, we'll forbid opening both pipes at the same time. So, add a new pipe_open callback to the rpc_pipefs api, which the gss code can use to track which pipes have been open, and to refuse opens of incompatible pipes. We only need this to be called on the first open of a given pipe. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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