43d78ef2ba
RFC3530 section 3.1.1 states an NFSv4 client MUST NOT send a request twice on the same connection unless it is the NULL procedure. Section 3.1.1 suggests that the client should disconnect and reconnect if it wants to retry a request. Implement this by adding an rpc_clnt flag that an ULP can use to specify that the underlying transport should be disconnected on a major timeout. The NFSv4 client asserts this new flag, and requests no retries after a minor retransmit timeout. Note that disconnecting on a retransmit is in general not safe to do if the RPC client does not reuse the TCP port number when reconnecting. See http://bugzilla.linux-nfs.org/show_bug.cgi?id=6 Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
151 lines
4.7 KiB
C
151 lines
4.7 KiB
C
/*
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* linux/include/linux/sunrpc/clnt.h
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*
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* Declarations for the high-level RPC client interface
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*
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* Copyright (C) 1995, 1996, Olaf Kirch <okir@monad.swb.de>
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*/
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#ifndef _LINUX_SUNRPC_CLNT_H
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#define _LINUX_SUNRPC_CLNT_H
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#include <linux/sunrpc/msg_prot.h>
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#include <linux/sunrpc/sched.h>
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#include <linux/sunrpc/xprt.h>
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#include <linux/sunrpc/auth.h>
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#include <linux/sunrpc/stats.h>
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#include <linux/sunrpc/xdr.h>
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#include <linux/sunrpc/timer.h>
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#include <asm/signal.h>
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struct rpc_inode;
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/*
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* The high-level client handle
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*/
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struct rpc_clnt {
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atomic_t cl_count; /* Number of clones */
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atomic_t cl_users; /* number of references */
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struct rpc_xprt * cl_xprt; /* transport */
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struct rpc_procinfo * cl_procinfo; /* procedure info */
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u32 cl_prog, /* RPC program number */
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cl_vers, /* RPC version number */
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cl_maxproc; /* max procedure number */
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char * cl_server; /* server machine name */
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char * cl_protname; /* protocol name */
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struct rpc_auth * cl_auth; /* authenticator */
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struct rpc_stat * cl_stats; /* per-program statistics */
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struct rpc_iostats * cl_metrics; /* per-client statistics */
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unsigned int cl_softrtry : 1,/* soft timeouts */
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cl_intr : 1,/* interruptible */
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cl_discrtry : 1,/* disconnect before retry */
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cl_autobind : 1,/* use getport() */
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cl_oneshot : 1,/* dispose after use */
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cl_dead : 1;/* abandoned */
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struct rpc_rtt * cl_rtt; /* RTO estimator data */
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int cl_nodelen; /* nodename length */
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char cl_nodename[UNX_MAXNODENAME];
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char cl_pathname[30];/* Path in rpc_pipe_fs */
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struct vfsmount * cl_vfsmnt;
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struct dentry * cl_dentry; /* inode */
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struct rpc_clnt * cl_parent; /* Points to parent of clones */
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struct rpc_rtt cl_rtt_default;
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struct rpc_program * cl_program;
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char cl_inline_name[32];
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};
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/*
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* General RPC program info
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*/
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#define RPC_MAXVERSION 4
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struct rpc_program {
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char * name; /* protocol name */
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u32 number; /* program number */
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unsigned int nrvers; /* number of versions */
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struct rpc_version ** version; /* version array */
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struct rpc_stat * stats; /* statistics */
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char * pipe_dir_name; /* path to rpc_pipefs dir */
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};
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struct rpc_version {
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u32 number; /* version number */
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unsigned int nrprocs; /* number of procs */
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struct rpc_procinfo * procs; /* procedure array */
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};
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/*
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* Procedure information
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*/
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struct rpc_procinfo {
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u32 p_proc; /* RPC procedure number */
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kxdrproc_t p_encode; /* XDR encode function */
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kxdrproc_t p_decode; /* XDR decode function */
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unsigned int p_bufsiz; /* req. buffer size */
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unsigned int p_count; /* call count */
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unsigned int p_timer; /* Which RTT timer to use */
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u32 p_statidx; /* Which procedure to account */
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char * p_name; /* name of procedure */
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};
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#ifdef __KERNEL__
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struct rpc_create_args {
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int protocol;
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struct sockaddr *address;
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size_t addrsize;
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struct rpc_timeout *timeout;
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char *servername;
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struct rpc_program *program;
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u32 version;
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rpc_authflavor_t authflavor;
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unsigned long flags;
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};
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/* Values for "flags" field */
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#define RPC_CLNT_CREATE_HARDRTRY (1UL << 0)
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#define RPC_CLNT_CREATE_INTR (1UL << 1)
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#define RPC_CLNT_CREATE_AUTOBIND (1UL << 2)
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#define RPC_CLNT_CREATE_ONESHOT (1UL << 3)
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#define RPC_CLNT_CREATE_NONPRIVPORT (1UL << 4)
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#define RPC_CLNT_CREATE_NOPING (1UL << 5)
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#define RPC_CLNT_CREATE_DISCRTRY (1UL << 6)
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struct rpc_clnt *rpc_create(struct rpc_create_args *args);
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struct rpc_clnt *rpc_bind_new_program(struct rpc_clnt *,
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struct rpc_program *, int);
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struct rpc_clnt *rpc_clone_client(struct rpc_clnt *);
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int rpc_shutdown_client(struct rpc_clnt *);
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int rpc_destroy_client(struct rpc_clnt *);
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void rpc_release_client(struct rpc_clnt *);
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void rpc_getport(struct rpc_task *);
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int rpc_register(u32, u32, int, unsigned short, int *);
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void rpc_call_setup(struct rpc_task *, struct rpc_message *, int);
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int rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg,
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int flags, const struct rpc_call_ops *tk_ops,
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void *calldata);
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int rpc_call_sync(struct rpc_clnt *clnt, struct rpc_message *msg,
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int flags);
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void rpc_restart_call(struct rpc_task *);
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void rpc_clnt_sigmask(struct rpc_clnt *clnt, sigset_t *oldset);
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void rpc_clnt_sigunmask(struct rpc_clnt *clnt, sigset_t *oldset);
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void rpc_setbufsize(struct rpc_clnt *, unsigned int, unsigned int);
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size_t rpc_max_payload(struct rpc_clnt *);
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void rpc_force_rebind(struct rpc_clnt *);
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int rpc_ping(struct rpc_clnt *clnt, int flags);
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size_t rpc_peeraddr(struct rpc_clnt *, struct sockaddr *, size_t);
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char * rpc_peeraddr2str(struct rpc_clnt *, enum rpc_display_format_t);
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/*
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* Helper function for NFSroot support
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*/
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int rpc_getport_external(struct sockaddr_in *, __u32, __u32, int);
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#endif /* __KERNEL__ */
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#endif /* _LINUX_SUNRPC_CLNT_H */
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