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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 /include/linux/sunrpc/rpc_pipe_fs.h
parentdb75b3d6b5b0dad29860370618ea94d2726641b4 (diff)
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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>
Diffstat (limited to 'include/linux/sunrpc/rpc_pipe_fs.h')
-rw-r--r--include/linux/sunrpc/rpc_pipe_fs.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/sunrpc/rpc_pipe_fs.h b/include/linux/sunrpc/rpc_pipe_fs.h
index 51b977a4ca2..cea764c2359 100644
--- a/include/linux/sunrpc/rpc_pipe_fs.h
+++ b/include/linux/sunrpc/rpc_pipe_fs.h
@@ -15,6 +15,7 @@ struct rpc_pipe_ops {
ssize_t (*upcall)(struct file *, struct rpc_pipe_msg *, char __user *, size_t);
ssize_t (*downcall)(struct file *, const char __user *, size_t);
void (*release_pipe)(struct inode *);
+ int (*open_pipe)(struct inode *);
void (*destroy_msg)(struct rpc_pipe_msg *);
};