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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 */ |