net/sunrpc/bc_svc.c

   1 /******************************************************************************
   2
   3 (c) 2007 Network Appliance, Inc.  All Rights Reserved.
   4 (c) 2009 NetApp.  All Rights Reserved.
   5
   6 NetApp provides this source code under the GPL v2 License.
   7 The GPL v2 license is available at
   8 http://opensource.org/licenses/gpl-license.php.
   9
  10 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  11 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  12 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  13 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  14 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  15 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  16 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  17 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  18 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  19 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  20 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  21
  22 ******************************************************************************/
  23
  24 /*
  25  * The NFSv4.1 callback service helper routines.
  26  * They implement the transport level processing required to send the
  27  * reply over an existing open connection previously established by the client.
  28  */
  29
  30 #if defined(CONFIG_NFS_V4_1)
  31
  32 #include <linux/module.h>
  33
  34 #include <linux/sunrpc/xprt.h>
  35 #include <linux/sunrpc/sched.h>
  36 #include <linux/sunrpc/bc_xprt.h>
  37
  38 #define RPCDBG_FACILITY RPCDBG_SVCDSP
  39
  40 void bc_release_request(struct rpc_task *task)
  41 {
  42         struct rpc_rqst *req = task->tk_rqstp;
  43
  44         dprintk("RPC:       bc_release_request: task= %p\n", task);
  45
  46         /*
  47          * Release this request only if it's a backchannel
  48          * preallocated request
  49          */
  50         if (!bc_prealloc(req))
  51                 return;
  52         xprt_free_bc_request(req);
  53 }
  54
  55 /* Empty callback ops */
  56 static const struct rpc_call_ops nfs41_callback_ops = {
  57 };
  58
  59
  60 /*
  61  * Send the callback reply
  62  */
  63 int bc_send(struct rpc_rqst *req)
  64 {
  65         struct rpc_task *task;
  66         int ret;
  67
  68         dprintk("RPC:       bc_send req= %p\n", req);
  69         task = rpc_run_bc_task(req, &nfs41_callback_ops);
  70         if (IS_ERR(task))
  71                 ret = PTR_ERR(task);
  72         else {
  73                 BUG_ON(atomic_read(&task->tk_count) != 1);
  74                 ret = task->tk_status;
  75                 rpc_put_task(task);
  76         }
  77         return ret;
  78         dprintk("RPC:       bc_send ret= %d \n", ret);
  79 }
  80
  81 #endif /* CONFIG_NFS_V4_1 */