LXR linux/include/linux/sunrpc/bc

   1/******************************************************************************
   2
   3(c) 2008 NetApp.  All Rights Reserved.
   4
   5NetApp provides this source code under the GPL v2 License.
   6The GPL v2 license is available at
   7http://opensource.org/licenses/gpl-license.php.
   8
   9THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  10"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  11LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  12A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  13CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  14EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  15PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  16PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  17LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  18NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  19SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  20
  21******************************************************************************/
  22
  23/*
  24 * Functions to create and manage the backchannel
  25 */
  26
  27#ifndef _LINUX_SUNRPC_BC_XPRT_H
  28#define _LINUX_SUNRPC_BC_XPRT_H
  29
  30#include <linux/sunrpc/svcsock.h>
  31#include <linux/sunrpc/xprt.h>
  32#include <linux/sunrpc/sched.h>
  33
  34#ifdef CONFIG_SUNRPC_BACKCHANNEL
  35struct rpc_rqst *xprt_lookup_bc_request(struct rpc_xprt *xprt, __be32 xid);
  36void xprt_complete_bc_request(struct rpc_rqst *req, uint32_t copied);
  37void xprt_init_bc_request(struct rpc_rqst *req, struct rpc_task *task);
  38void xprt_free_bc_request(struct rpc_rqst *req);
  39int xprt_setup_backchannel(struct rpc_xprt *, unsigned int min_reqs);
  40void xprt_destroy_backchannel(struct rpc_xprt *, unsigned int max_reqs);
  41
  42/* Socket backchannel transport methods */
  43int xprt_setup_bc(struct rpc_xprt *xprt, unsigned int min_reqs);
  44void xprt_destroy_bc(struct rpc_xprt *xprt, unsigned int max_reqs);
  45void xprt_free_bc_rqst(struct rpc_rqst *req);
  46unsigned int xprt_bc_max_slots(struct rpc_xprt *xprt);
  47
  48/*
  49 * Determine if a shared backchannel is in use
  50 */
  51static inline bool svc_is_backchannel(const struct svc_rqst *rqstp)
  52{
  53        return rqstp->rq_server->sv_bc_enabled;
  54}
  55
  56static inline void set_bc_enabled(struct svc_serv *serv)
  57{
  58        serv->sv_bc_enabled = true;
  59}
  60#else /* CONFIG_SUNRPC_BACKCHANNEL */
  61static inline int xprt_setup_backchannel(struct rpc_xprt *xprt,
  62                                         unsigned int min_reqs)
  63{
  64        return 0;
  65}
  66
  67static inline void xprt_destroy_backchannel(struct rpc_xprt *xprt,
  68                                            unsigned int max_reqs)
  69{
  70}
  71
  72static inline bool svc_is_backchannel(const struct svc_rqst *rqstp)
  73{
  74        return false;
  75}
  76
  77static inline void set_bc_enabled(struct svc_serv *serv)
  78{
  79}
  80
  81static inline void xprt_free_bc_request(struct rpc_rqst *req)
  82{
  83}
  84#endif /* CONFIG_SUNRPC_BACKCHANNEL */
  85#endif /* _LINUX_SUNRPC_BC_XPRT_H */
  86
  87