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bc_xprt.h
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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
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12 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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14 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
15 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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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.
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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 *, unsigned 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