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sunrpc: document the rpc_pipefs kernel api

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Add kerneldoc comments for the rpc_pipefs.c functions that are exported.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
J. Bruce Fields 2007-11-06 13:06:03 -05:00 committed by Trond Myklebust
parent 663b8858dd
commit 93a44a75b9
1 changed files with 51 additions and 1 deletions
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52
net/sunrpc/rpc_pipe.c
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@ -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.
*/
int
rpc_queue_upcall(struct inode *inode, struct rpc_pipe_msg *msg)
{
@ -663,7 +673,16 @@ rpc_lookup_negative(char *path, struct nameidata *nd)
return dentry;
}
/**
* 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:
goto out;
}
/**
* rpc_rmdir - Remove a directory created with rpc_mkdir()
* @dentry: directory to remove
*/
int
rpc_rmdir(struct dentry *dentry)
{
@ -717,6 +740,25 @@ rpc_rmdir(struct dentry *dentry)
return error;
}
/**
* 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:
goto out;
}
/**
* 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.
*/
int
rpc_unlink(struct dentry *dentry)
{