include/linux/sunrpc/bc_xprt.h

/******************************************************************************

(c) 2008 NetApp.  All Rights Reserved.

NetApp provides this source code under the GPL v2 License.
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http://opensource.org/licenses/gpl-license.php.

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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

******************************************************************************/

/*
 * Functions to create and manage the backchannel
 */

#ifndef _LINUX_SUNRPC_BC_XPRT_H
#define _LINUX_SUNRPC_BC_XPRT_H

#include <linux/sunrpc/svcsock.h>
#include <linux/sunrpc/xprt.h>
#include <linux/sunrpc/sched.h>

#ifdef CONFIG_NFS_V4_1
struct rpc_rqst *xprt_alloc_bc_request(struct rpc_xprt *xprt);
void xprt_free_bc_request(struct rpc_rqst *req);
int xprt_setup_backchannel(struct rpc_xprt *, unsigned int min_reqs);
void xprt_destroy_backchannel(struct rpc_xprt *, int max_reqs);
int bc_send(struct rpc_rqst *req);

/*
 * Determine if a shared backchannel is in use
 */
static inline int svc_is_backchannel(const struct svc_rqst *rqstp)
{
	if (rqstp->rq_server->bc_xprt)
		return 1;
	return 0;
}
#else /* CONFIG_NFS_V4_1 */
static inline int xprt_setup_backchannel(struct rpc_xprt *xprt,
					 unsigned int min_reqs)
{
	return 0;
}

static inline int svc_is_backchannel(const struct svc_rqst *rqstp)
{
	return 0;
}

static inline void xprt_free_bc_request(struct rpc_rqst *req)
{
}
#endif /* CONFIG_NFS_V4_1 */
#endif /* _LINUX_SUNRPC_BC_XPRT_H */