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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/include/linux/sunrpc/bc_xprt.h
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@@ -4,7 +4,7 @@
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 NetApp provides this source code under the GPL v2 License.
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 The GPL v2 license is available at
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-http://opensource.org/licenses/gpl-license.php.
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+https://opensource.org/licenses/gpl-license.php.
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 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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@@ -34,6 +34,7 @@
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 #ifdef CONFIG_SUNRPC_BACKCHANNEL
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 struct rpc_rqst *xprt_lookup_bc_request(struct rpc_xprt *xprt, __be32 xid);
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 void xprt_complete_bc_request(struct rpc_rqst *req, uint32_t copied);
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+void xprt_init_bc_request(struct rpc_rqst *req, struct rpc_task *task);
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 void xprt_free_bc_request(struct rpc_rqst *req);
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 int xprt_setup_backchannel(struct rpc_xprt *, unsigned int min_reqs);
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 void xprt_destroy_backchannel(struct rpc_xprt *, unsigned int max_reqs);
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@@ -42,15 +43,19 @@
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 int xprt_setup_bc(struct rpc_xprt *xprt, unsigned int min_reqs);
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 void xprt_destroy_bc(struct rpc_xprt *xprt, unsigned int max_reqs);
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 void xprt_free_bc_rqst(struct rpc_rqst *req);
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+unsigned int xprt_bc_max_slots(struct rpc_xprt *xprt);
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 /*
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  * Determine if a shared backchannel is in use
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  */
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-static inline int svc_is_backchannel(const struct svc_rqst *rqstp)
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+static inline bool svc_is_backchannel(const struct svc_rqst *rqstp)
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 {
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-	if (rqstp->rq_server->sv_bc_xprt)
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-		return 1;
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-	return 0;
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+	return rqstp->rq_server->sv_bc_enabled;
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+}
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+
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+static inline void set_bc_enabled(struct svc_serv *serv)
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+{
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+	serv->sv_bc_enabled = true;
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 }
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 #else /* CONFIG_SUNRPC_BACKCHANNEL */
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 static inline int xprt_setup_backchannel(struct rpc_xprt *xprt,
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@@ -59,9 +64,18 @@
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 	return 0;
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 }
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-static inline int svc_is_backchannel(const struct svc_rqst *rqstp)
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+static inline void xprt_destroy_backchannel(struct rpc_xprt *xprt,
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+					    unsigned int max_reqs)
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 {
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-	return 0;
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+}
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+
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+static inline bool svc_is_backchannel(const struct svc_rqst *rqstp)
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+{
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+	return false;
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+}
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+
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+static inline void set_bc_enabled(struct svc_serv *serv)
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+{
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 }
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 static inline void xprt_free_bc_request(struct rpc_rqst *req)