include/linux/sunrpc/bc_xprt.h

   1 /******************************************************************************
   2
   3 (c) 2008 NetApp.  All Rights Reserved.
   4
   5 NetApp provides this source code under the GPL v2 License.
   6 The GPL v2 license is available at
   7 http://opensource.org/licenses/gpl-license.php.
   8
   9 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  10 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  11 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  12 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  13 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  14 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  15 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  16 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  17 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  18 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  19 SOFTWARE, 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
  35 struct rpc_rqst *xprt_alloc_bc_request(struct rpc_xprt *xprt);
  36 void xprt_free_bc_request(struct rpc_rqst *req);
  37 int xprt_setup_backchannel(struct rpc_xprt *, unsigned int min_reqs);
  38 void xprt_destroy_backchannel(struct rpc_xprt *, int max_reqs);
  39 int bc_send(struct rpc_rqst *req);
  40
  41 /*
  42  * Determine if a shared backchannel is in use
  43  */
  44 static inline int svc_is_backchannel(const struct svc_rqst *rqstp)
  45 {
  46         if (rqstp->rq_server->sv_bc_xprt)
  47                 return 1;
  48         return 0;
  49 }
  50 #else /* CONFIG_SUNRPC_BACKCHANNEL */
  51 static inline int xprt_setup_backchannel(struct rpc_xprt *xprt,
  52                                          unsigned int min_reqs)
  53 {
  54         return 0;
  55 }
  56
  57 static inline int svc_is_backchannel(const struct svc_rqst *rqstp)
  58 {
  59         return 0;
  60 }
  61
  62 static inline void xprt_free_bc_request(struct rpc_rqst *req)
  63 {
  64 }
  65 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
  66 #endif /* _LINUX_SUNRPC_BC_XPRT_H */
  67