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Commit 0d90ba1c authored by Ricardo Labiaga's avatar Ricardo Labiaga Committed by Benny Halevy
Browse files

nfs41: Backchannel callback service helper routines 



Executes the backchannel task on the RPC state machine using
the existing open connection previously established by the client.

Signed-off-by: default avatarRicardo Labiaga <ricardo.labiaga@netapp.com>

nfs41: Add bc_svc.o to sunrpc Makefile.

[nfs41: bc_send() does not need to be exported outside RPC module]
[nfs41: xprt_free_bc_request() need not be exported outside RPC module]
Signed-off-by: default avatarRicardo Labiaga <Ricardo.Labiaga@netapp.com>
Signed-off-by: default avatarBenny Halevy <bhalevy@panasas.com>
[Update copyright]
Signed-off-by: default avatarRicardo Labiaga <Ricardo.Labiaga@netapp.com>
Signed-off-by: default avatarBenny Halevy <bhalevy@panasas.com>
parent 55ae1aab

include/linux/sunrpc/bc_xprt.h

+3 −0
Original line number Diff line number Diff line
@@ -29,12 +29,15 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 


#include <linux/sunrpc/svcsock.h>

#include <linux/sunrpc/xprt.h>

#include <linux/sunrpc/sched.h>



#ifdef CONFIG_NFS_V4_1

struct rpc_rqst *xprt_alloc_bc_request(struct rpc_xprt *xprt);

void xprt_free_bc_request(struct rpc_rqst *req);

int xprt_setup_backchannel(struct rpc_xprt *, unsigned int min_reqs);

void xprt_destroy_backchannel(struct rpc_xprt *, int max_reqs);

void bc_release_request(struct rpc_task *);

int bc_send(struct rpc_rqst *req);

#else /* CONFIG_NFS_V4_1 */

static inline int xprt_setup_backchannel(struct rpc_xprt *xprt,

					 unsigned int min_reqs)

net/sunrpc/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -13,6 +13,6 @@ sunrpc-y := clnt.o xprt.o socklib.o xprtsock.o sched.o \ 
	    rpcb_clnt.o timer.o xdr.o \

	    sunrpc_syms.o cache.o rpc_pipe.o \

	    svc_xprt.o

sunrpc-$(CONFIG_NFS_V4_1) += backchannel_rqst.o

sunrpc-$(CONFIG_NFS_V4_1) += backchannel_rqst.o bc_svc.o

sunrpc-$(CONFIG_PROC_FS) += stats.o

sunrpc-$(CONFIG_SYSCTL) += sysctl.o

net/sunrpc/bc_svc.c

0 → 100644
+81 −0
Original line number Diff line number Diff line 
/******************************************************************************



(c) 2007 Network Appliance, Inc.  All Rights Reserved.

(c) 2009 NetApp.  All Rights Reserved.



NetApp provides this source code under the GPL v2 License.

The GPL v2 license is available at

http://opensource.org/licenses/gpl-license.php.



THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR

CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF

LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING

NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.



******************************************************************************/



/*

 * The NFSv4.1 callback service helper routines.

 * They implement the transport level processing required to send the

 * reply over an existing open connection previously established by the client.

 */



#if defined(CONFIG_NFS_V4_1)



#include <linux/module.h>



#include <linux/sunrpc/xprt.h>

#include <linux/sunrpc/sched.h>

#include <linux/sunrpc/bc_xprt.h>



#define RPCDBG_FACILITY	RPCDBG_SVCDSP



void bc_release_request(struct rpc_task *task)

{

	struct rpc_rqst *req = task->tk_rqstp;



	dprintk("RPC:       bc_release_request: task= %p\n", task);



	/*

	 * Release this request only if it's a backchannel

	 * preallocated request

	 */

	if (!bc_prealloc(req))

		return;

	xprt_free_bc_request(req);

}



/* Empty callback ops */

static const struct rpc_call_ops nfs41_callback_ops = {

};





/*

 * Send the callback reply

 */

int bc_send(struct rpc_rqst *req)

{

	struct rpc_task *task;

	int ret;



	dprintk("RPC:       bc_send req= %p\n", req);

	task = rpc_run_bc_task(req, &nfs41_callback_ops);

	if (IS_ERR(task))

		ret = PTR_ERR(task);

	else {

		BUG_ON(atomic_read(&task->tk_count) != 1);

		ret = task->tk_status;

		rpc_put_task(task);

	}

	return ret;

	dprintk("RPC:       bc_send ret= %d \n", ret);

}



#endif /* CONFIG_NFS_V4_1 */

net/sunrpc/xprtsock.c

+3 −0
Original line number Diff line number Diff line
@@ -2183,6 +2183,9 @@ static struct rpc_xprt_ops xs_tcp_ops = { 
	.buf_free		= rpc_free,

	.send_request		= xs_tcp_send_request,

	.set_retrans_timeout	= xprt_set_retrans_timeout_def,

#if defined(CONFIG_NFS_V4_1)

	.release_request	= bc_release_request,

#endif /* CONFIG_NFS_V4_1 */

	.close			= xs_tcp_close,

	.destroy		= xs_destroy,

	.print_stats		= xs_tcp_print_stats,