Commit 6f8b26c9 authored by Olga Kornievskaia's avatar Olga Kornievskaia Committed by Trond Myklebust
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SUNRPC: new helper function for stopping backchannel server 



Create a new backchannel function to stop the backchannel server
and clear the bc_serv in transport protected under the bc_pa_lock.

Signed-off-by: default avatarOlga Kornievskaia <okorniev@redhat.com>
Signed-off-by: default avatarTrond Myklebust <trond.myklebust@hammerspace.com>
parent 441244d4

include/linux/sunrpc/bc_xprt.h

+6 −0
Original line number Diff line number Diff line
@@ -32,6 +32,7 @@ int xprt_setup_bc(struct rpc_xprt *xprt, unsigned int min_reqs); 
void xprt_destroy_bc(struct rpc_xprt *xprt, unsigned int max_reqs);

void xprt_free_bc_rqst(struct rpc_rqst *req);

unsigned int xprt_bc_max_slots(struct rpc_xprt *xprt);

void xprt_svc_destroy_nullify_bc(struct rpc_xprt *xprt, struct svc_serv **serv);



/*

 * Determine if a shared backchannel is in use
@@ -69,5 +70,10 @@ static inline void set_bc_enabled(struct svc_serv *serv) 
static inline void xprt_free_bc_request(struct rpc_rqst *req)

{

}



static inline void xprt_svc_destroy_nullify_bc(struct rpc_xprt *xprt, struct svc_serv **serv)

{

	svc_destroy(serv);

}

#endif /* CONFIG_SUNRPC_BACKCHANNEL */

#endif /* _LINUX_SUNRPC_BC_XPRT_H */

net/sunrpc/backchannel_rqst.c

+16 −0
Original line number Diff line number Diff line
@@ -24,6 +24,22 @@ unsigned int xprt_bc_max_slots(struct rpc_xprt *xprt) 
	return BC_MAX_SLOTS;

}



/*

 * Helper function to nullify backchannel server pointer in transport.

 * We need to synchronize setting the pointer to NULL (done so after

 * the backchannel server is shutdown) with the usage of that pointer

 * by the backchannel request processing routines

 * xprt_complete_bc_request() and rpcrdma_bc_receive_call().

 */

void xprt_svc_destroy_nullify_bc(struct rpc_xprt *xprt, struct svc_serv **serv)

{

	spin_lock(&xprt->bc_pa_lock);

	svc_destroy(serv);

	xprt->bc_serv = NULL;

	spin_unlock(&xprt->bc_pa_lock);

}

EXPORT_SYMBOL_GPL(xprt_svc_destroy_nullify_bc);



/*

 * Helper routines that track the number of preallocation elements

 * on the transport.