Author: J. Bruce Fields <[EMAIL PROTECTED]>
AuthorDate: Tue Nov 6 13:06:03 2007 -0500
Committer: Trond Myklebust <[EMAIL PROTECTED]>
CommitDate: Wed Jan 30 02:05:27 2008 -0500
sunrpc: document the rpc_pipefs kernel api
Add kerneldoc comments for the rpc_pipefs.c functions that are exported.
Signed-off-by: J. Bruce Fields <[EMAIL PROTECTED]>
Signed-off-by: Trond Myklebust <[EMAIL PROTECTED]>
net/sunrpc/rpc_pipe.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 51 insertions(+), 1 deletions(-)
diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index c59f3ca..5364e2e 100644
@@ -76,6 +76,16 @@ rpc_timeout_upcall_queue(struct work_struct *work)
rpc_purge_list(rpci, &free_list, destroy_msg, -ETIMEDOUT);
+ * rpc_queue_upcall
+ * @inode: inode of upcall pipe on which to queue given message
+ * @msg: message to queue
+ * Call with an @inode created by rpc_mkpipe() to queue an upcall.
+ * A userspace process may then later read the upcall by performing a
+ * read on an open file for this inode. It is up to the caller to
+ * initialize the fields of @msg (other than @msg->list) appropriately.
rpc_queue_upcall(struct inode *inode, struct rpc_pipe_msg *msg)
@@ -663,7 +673,16 @@ rpc_lookup_negative(char *path, struct nameidata *nd)
+ * rpc_mkdir - Create a new directory in rpc_pipefs
+ * @path: path from the rpc_pipefs root to the new directory
+ * @rpc_clnt: rpc client to associate with this directory
+ * This creates a directory at the given @path associated with
+ * @rpc_clnt, which will contain a file named "info" with some basic
+ * information about the client, together with any "pipes" that may
+ * later be created using rpc_mkpipe().
struct dentry *
rpc_mkdir(char *path, struct rpc_clnt *rpc_client)
@@ -699,6 +718,10 @@ err_dput:
+ * rpc_rmdir - Remove a directory created with rpc_mkdir()
+ * @dentry: directory to remove
rpc_rmdir(struct dentry *dentry)
@@ -717,6 +740,25 @@ rpc_rmdir(struct dentry *dentry)
+ * rpc_mkpipe - make an rpc_pipefs file for kernel<->userspace communication
+ * @parent: dentry of directory to create new "pipe" in
+ * @name: name of pipe
+ * @private: private data to associate with the pipe, for the caller's use
+ * @ops: operations defining the behavior of the pipe: upcall, downcall,
+ * release_pipe, and destroy_msg.
+ * Data is made available for userspace to read by calls to
+ * rpc_queue_upcall(). The actual reads will result in calls to
+ * @ops->upcall, which will be called with the file pointer,
+ * message, and userspace buffer to copy to.
+ * Writes can come at any time, and do not necessarily have to be
+ * responses to upcalls. They will result in calls to @msg->downcall.
+ * The @private argument passed here will be available to all these methods
+ * from the file pointer, via RPC_I(file->f_dentry->d_inode)->private.
struct dentry *
rpc_mkpipe(struct dentry *parent, const char *name, void *private, struct
rpc_pipe_ops *ops, int flags)
@@ -764,6 +806,14 @@ err_dput:
+ * rpc_unlink - remove a pipe
+ * @dentry: dentry for the pipe, as returned from rpc_mkpipe
+ * After this call, lookups will no longer find the pipe, and any
+ * attempts to read or write using preexisting opens of the pipe will
+ * return -EPIPE.
rpc_unlink(struct dentry *dentry)
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