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577 lines
18 KiB
577 lines
18 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* linux/include/linux/sunrpc/svc.h |
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* |
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* RPC server declarations. |
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* |
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* Copyright (C) 1995, 1996 Olaf Kirch <[email protected]> |
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*/ |
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#ifndef SUNRPC_SVC_H |
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#define SUNRPC_SVC_H |
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#include <linux/in.h> |
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#include <linux/in6.h> |
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#include <linux/sunrpc/types.h> |
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#include <linux/sunrpc/xdr.h> |
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#include <linux/sunrpc/auth.h> |
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#include <linux/sunrpc/svcauth.h> |
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#include <linux/wait.h> |
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#include <linux/mm.h> |
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/* statistics for svc_pool structures */ |
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struct svc_pool_stats { |
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atomic_long_t packets; |
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unsigned long sockets_queued; |
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atomic_long_t threads_woken; |
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atomic_long_t threads_timedout; |
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}; |
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/* |
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* |
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* RPC service thread pool. |
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* |
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* Pool of threads and temporary sockets. Generally there is only |
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* a single one of these per RPC service, but on NUMA machines those |
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* services that can benefit from it (i.e. nfs but not lockd) will |
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* have one pool per NUMA node. This optimisation reduces cross- |
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* node traffic on multi-node NUMA NFS servers. |
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*/ |
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struct svc_pool { |
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unsigned int sp_id; /* pool id; also node id on NUMA */ |
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spinlock_t sp_lock; /* protects all fields */ |
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struct list_head sp_sockets; /* pending sockets */ |
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unsigned int sp_nrthreads; /* # of threads in pool */ |
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struct list_head sp_all_threads; /* all server threads */ |
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struct svc_pool_stats sp_stats; /* statistics on pool operation */ |
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#define SP_TASK_PENDING (0) /* still work to do even if no |
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* xprt is queued. */ |
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#define SP_CONGESTED (1) |
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unsigned long sp_flags; |
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} ____cacheline_aligned_in_smp; |
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struct svc_serv; |
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struct svc_serv_ops { |
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/* Callback to use when last thread exits. */ |
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void (*svo_shutdown)(struct svc_serv *, struct net *); |
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/* function for service threads to run */ |
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int (*svo_function)(void *); |
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/* queue up a transport for servicing */ |
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void (*svo_enqueue_xprt)(struct svc_xprt *); |
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/* set up thread (or whatever) execution context */ |
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int (*svo_setup)(struct svc_serv *, struct svc_pool *, int); |
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/* optional module to count when adding threads (pooled svcs only) */ |
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struct module *svo_module; |
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}; |
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/* |
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* RPC service. |
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* |
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* An RPC service is a ``daemon,'' possibly multithreaded, which |
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* receives and processes incoming RPC messages. |
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* It has one or more transport sockets associated with it, and maintains |
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* a list of idle threads waiting for input. |
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* |
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* We currently do not support more than one RPC program per daemon. |
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*/ |
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struct svc_serv { |
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struct svc_program * sv_program; /* RPC program */ |
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struct svc_stat * sv_stats; /* RPC statistics */ |
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spinlock_t sv_lock; |
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unsigned int sv_nrthreads; /* # of server threads */ |
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unsigned int sv_maxconn; /* max connections allowed or |
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* '0' causing max to be based |
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* on number of threads. */ |
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unsigned int sv_max_payload; /* datagram payload size */ |
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unsigned int sv_max_mesg; /* max_payload + 1 page for overheads */ |
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unsigned int sv_xdrsize; /* XDR buffer size */ |
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struct list_head sv_permsocks; /* all permanent sockets */ |
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struct list_head sv_tempsocks; /* all temporary sockets */ |
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int sv_tmpcnt; /* count of temporary sockets */ |
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struct timer_list sv_temptimer; /* timer for aging temporary sockets */ |
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char * sv_name; /* service name */ |
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unsigned int sv_nrpools; /* number of thread pools */ |
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struct svc_pool * sv_pools; /* array of thread pools */ |
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const struct svc_serv_ops *sv_ops; /* server operations */ |
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#if defined(CONFIG_SUNRPC_BACKCHANNEL) |
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struct list_head sv_cb_list; /* queue for callback requests |
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* that arrive over the same |
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* connection */ |
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spinlock_t sv_cb_lock; /* protects the svc_cb_list */ |
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wait_queue_head_t sv_cb_waitq; /* sleep here if there are no |
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* entries in the svc_cb_list */ |
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bool sv_bc_enabled; /* service uses backchannel */ |
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#endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
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}; |
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/* |
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* We use sv_nrthreads as a reference count. svc_destroy() drops |
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* this refcount, so we need to bump it up around operations that |
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* change the number of threads. Horrible, but there it is. |
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* Should be called with the "service mutex" held. |
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*/ |
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static inline void svc_get(struct svc_serv *serv) |
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{ |
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serv->sv_nrthreads++; |
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} |
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/* |
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* Maximum payload size supported by a kernel RPC server. |
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* This is use to determine the max number of pages nfsd is |
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* willing to return in a single READ operation. |
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* |
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* These happen to all be powers of 2, which is not strictly |
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* necessary but helps enforce the real limitation, which is |
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* that they should be multiples of PAGE_SIZE. |
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* |
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* For UDP transports, a block plus NFS,RPC, and UDP headers |
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* has to fit into the IP datagram limit of 64K. The largest |
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* feasible number for all known page sizes is probably 48K, |
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* but we choose 32K here. This is the same as the historical |
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* Linux limit; someone who cares more about NFS/UDP performance |
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* can test a larger number. |
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* |
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* For TCP transports we have more freedom. A size of 1MB is |
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* chosen to match the client limit. Other OSes are known to |
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* have larger limits, but those numbers are probably beyond |
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* the point of diminishing returns. |
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*/ |
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#define RPCSVC_MAXPAYLOAD (1*1024*1024u) |
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#define RPCSVC_MAXPAYLOAD_TCP RPCSVC_MAXPAYLOAD |
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#define RPCSVC_MAXPAYLOAD_UDP (32*1024u) |
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extern u32 svc_max_payload(const struct svc_rqst *rqstp); |
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/* |
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* RPC Requsts and replies are stored in one or more pages. |
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* We maintain an array of pages for each server thread. |
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* Requests are copied into these pages as they arrive. Remaining |
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* pages are available to write the reply into. |
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* |
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* Pages are sent using ->sendpage so each server thread needs to |
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* allocate more to replace those used in sending. To help keep track |
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* of these pages we have a receive list where all pages initialy live, |
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* and a send list where pages are moved to when there are to be part |
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* of a reply. |
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* |
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* We use xdr_buf for holding responses as it fits well with NFS |
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* read responses (that have a header, and some data pages, and possibly |
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* a tail) and means we can share some client side routines. |
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* |
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* The xdr_buf.head kvec always points to the first page in the rq_*pages |
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* list. The xdr_buf.pages pointer points to the second page on that |
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* list. xdr_buf.tail points to the end of the first page. |
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* This assumes that the non-page part of an rpc reply will fit |
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* in a page - NFSd ensures this. lockd also has no trouble. |
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* |
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* Each request/reply pair can have at most one "payload", plus two pages, |
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* one for the request, and one for the reply. |
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* We using ->sendfile to return read data, we might need one extra page |
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* if the request is not page-aligned. So add another '1'. |
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*/ |
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#define RPCSVC_MAXPAGES ((RPCSVC_MAXPAYLOAD+PAGE_SIZE-1)/PAGE_SIZE \ |
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+ 2 + 1) |
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static inline u32 svc_getnl(struct kvec *iov) |
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{ |
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__be32 val, *vp; |
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vp = iov->iov_base; |
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val = *vp++; |
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iov->iov_base = (void*)vp; |
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iov->iov_len -= sizeof(__be32); |
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return ntohl(val); |
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} |
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static inline void svc_putnl(struct kvec *iov, u32 val) |
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{ |
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__be32 *vp = iov->iov_base + iov->iov_len; |
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*vp = htonl(val); |
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iov->iov_len += sizeof(__be32); |
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} |
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static inline __be32 svc_getu32(struct kvec *iov) |
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{ |
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__be32 val, *vp; |
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vp = iov->iov_base; |
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val = *vp++; |
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iov->iov_base = (void*)vp; |
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iov->iov_len -= sizeof(__be32); |
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return val; |
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} |
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static inline void svc_ungetu32(struct kvec *iov) |
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{ |
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__be32 *vp = (__be32 *)iov->iov_base; |
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iov->iov_base = (void *)(vp - 1); |
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iov->iov_len += sizeof(*vp); |
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} |
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static inline void svc_putu32(struct kvec *iov, __be32 val) |
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{ |
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__be32 *vp = iov->iov_base + iov->iov_len; |
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*vp = val; |
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iov->iov_len += sizeof(__be32); |
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} |
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/* |
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* The context of a single thread, including the request currently being |
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* processed. |
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*/ |
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struct svc_rqst { |
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struct list_head rq_all; /* all threads list */ |
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struct rcu_head rq_rcu_head; /* for RCU deferred kfree */ |
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struct svc_xprt * rq_xprt; /* transport ptr */ |
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struct sockaddr_storage rq_addr; /* peer address */ |
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size_t rq_addrlen; |
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struct sockaddr_storage rq_daddr; /* dest addr of request |
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* - reply from here */ |
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size_t rq_daddrlen; |
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struct svc_serv * rq_server; /* RPC service definition */ |
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struct svc_pool * rq_pool; /* thread pool */ |
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const struct svc_procedure *rq_procinfo;/* procedure info */ |
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struct auth_ops * rq_authop; /* authentication flavour */ |
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struct svc_cred rq_cred; /* auth info */ |
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void * rq_xprt_ctxt; /* transport specific context ptr */ |
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struct svc_deferred_req*rq_deferred; /* deferred request we are replaying */ |
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size_t rq_xprt_hlen; /* xprt header len */ |
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struct xdr_buf rq_arg; |
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struct xdr_stream rq_arg_stream; |
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struct page *rq_scratch_page; |
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struct xdr_buf rq_res; |
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struct page *rq_pages[RPCSVC_MAXPAGES + 1]; |
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struct page * *rq_respages; /* points into rq_pages */ |
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struct page * *rq_next_page; /* next reply page to use */ |
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struct page * *rq_page_end; /* one past the last page */ |
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struct kvec rq_vec[RPCSVC_MAXPAGES]; /* generally useful.. */ |
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struct bio_vec rq_bvec[RPCSVC_MAXPAGES]; |
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__be32 rq_xid; /* transmission id */ |
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u32 rq_prog; /* program number */ |
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u32 rq_vers; /* program version */ |
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u32 rq_proc; /* procedure number */ |
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u32 rq_prot; /* IP protocol */ |
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int rq_cachetype; /* catering to nfsd */ |
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#define RQ_SECURE (0) /* secure port */ |
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#define RQ_LOCAL (1) /* local request */ |
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#define RQ_USEDEFERRAL (2) /* use deferral */ |
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#define RQ_DROPME (3) /* drop current reply */ |
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#define RQ_SPLICE_OK (4) /* turned off in gss privacy |
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* to prevent encrypting page |
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* cache pages */ |
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#define RQ_VICTIM (5) /* about to be shut down */ |
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#define RQ_BUSY (6) /* request is busy */ |
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#define RQ_DATA (7) /* request has data */ |
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#define RQ_AUTHERR (8) /* Request status is auth error */ |
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unsigned long rq_flags; /* flags field */ |
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ktime_t rq_qtime; /* enqueue time */ |
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void * rq_argp; /* decoded arguments */ |
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void * rq_resp; /* xdr'd results */ |
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void * rq_auth_data; /* flavor-specific data */ |
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int rq_auth_slack; /* extra space xdr code |
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* should leave in head |
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* for krb5i, krb5p. |
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*/ |
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int rq_reserved; /* space on socket outq |
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* reserved for this request |
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*/ |
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ktime_t rq_stime; /* start time */ |
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struct cache_req rq_chandle; /* handle passed to caches for |
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* request delaying |
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*/ |
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/* Catering to nfsd */ |
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struct auth_domain * rq_client; /* RPC peer info */ |
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struct auth_domain * rq_gssclient; /* "gss/"-style peer info */ |
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struct svc_cacherep * rq_cacherep; /* cache info */ |
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struct task_struct *rq_task; /* service thread */ |
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spinlock_t rq_lock; /* per-request lock */ |
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struct net *rq_bc_net; /* pointer to backchannel's |
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* net namespace |
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*/ |
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void ** rq_lease_breaker; /* The v4 client breaking a lease */ |
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}; |
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#define SVC_NET(rqst) (rqst->rq_xprt ? rqst->rq_xprt->xpt_net : rqst->rq_bc_net) |
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/* |
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* Rigorous type checking on sockaddr type conversions |
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*/ |
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static inline struct sockaddr_in *svc_addr_in(const struct svc_rqst *rqst) |
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{ |
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return (struct sockaddr_in *) &rqst->rq_addr; |
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} |
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static inline struct sockaddr_in6 *svc_addr_in6(const struct svc_rqst *rqst) |
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{ |
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return (struct sockaddr_in6 *) &rqst->rq_addr; |
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} |
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static inline struct sockaddr *svc_addr(const struct svc_rqst *rqst) |
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{ |
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return (struct sockaddr *) &rqst->rq_addr; |
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} |
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static inline struct sockaddr_in *svc_daddr_in(const struct svc_rqst *rqst) |
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{ |
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return (struct sockaddr_in *) &rqst->rq_daddr; |
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} |
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static inline struct sockaddr_in6 *svc_daddr_in6(const struct svc_rqst *rqst) |
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{ |
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return (struct sockaddr_in6 *) &rqst->rq_daddr; |
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} |
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static inline struct sockaddr *svc_daddr(const struct svc_rqst *rqst) |
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{ |
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return (struct sockaddr *) &rqst->rq_daddr; |
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} |
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/* |
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* Check buffer bounds after decoding arguments |
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*/ |
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static inline int |
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xdr_argsize_check(struct svc_rqst *rqstp, __be32 *p) |
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{ |
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char *cp = (char *)p; |
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struct kvec *vec = &rqstp->rq_arg.head[0]; |
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return cp >= (char*)vec->iov_base |
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&& cp <= (char*)vec->iov_base + vec->iov_len; |
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} |
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static inline int |
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xdr_ressize_check(struct svc_rqst *rqstp, __be32 *p) |
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{ |
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struct kvec *vec = &rqstp->rq_res.head[0]; |
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char *cp = (char*)p; |
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vec->iov_len = cp - (char*)vec->iov_base; |
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return vec->iov_len <= PAGE_SIZE; |
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} |
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static inline void svc_free_res_pages(struct svc_rqst *rqstp) |
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{ |
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while (rqstp->rq_next_page != rqstp->rq_respages) { |
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struct page **pp = --rqstp->rq_next_page; |
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if (*pp) { |
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put_page(*pp); |
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*pp = NULL; |
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} |
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} |
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} |
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struct svc_deferred_req { |
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u32 prot; /* protocol (UDP or TCP) */ |
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struct svc_xprt *xprt; |
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struct sockaddr_storage addr; /* where reply must go */ |
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size_t addrlen; |
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struct sockaddr_storage daddr; /* where reply must come from */ |
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size_t daddrlen; |
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struct cache_deferred_req handle; |
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size_t xprt_hlen; |
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int argslen; |
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__be32 args[]; |
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}; |
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struct svc_process_info { |
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union { |
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int (*dispatch)(struct svc_rqst *, __be32 *); |
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struct { |
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unsigned int lovers; |
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unsigned int hivers; |
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} mismatch; |
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}; |
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}; |
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/* |
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* List of RPC programs on the same transport endpoint |
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*/ |
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struct svc_program { |
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struct svc_program * pg_next; /* other programs (same xprt) */ |
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u32 pg_prog; /* program number */ |
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unsigned int pg_lovers; /* lowest version */ |
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unsigned int pg_hivers; /* highest version */ |
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unsigned int pg_nvers; /* number of versions */ |
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const struct svc_version **pg_vers; /* version array */ |
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char * pg_name; /* service name */ |
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char * pg_class; /* class name: services sharing authentication */ |
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struct svc_stat * pg_stats; /* rpc statistics */ |
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int (*pg_authenticate)(struct svc_rqst *); |
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__be32 (*pg_init_request)(struct svc_rqst *, |
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const struct svc_program *, |
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struct svc_process_info *); |
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int (*pg_rpcbind_set)(struct net *net, |
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const struct svc_program *, |
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u32 version, int family, |
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unsigned short proto, |
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unsigned short port); |
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}; |
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/* |
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* RPC program version |
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*/ |
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struct svc_version { |
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u32 vs_vers; /* version number */ |
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u32 vs_nproc; /* number of procedures */ |
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const struct svc_procedure *vs_proc; /* per-procedure info */ |
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unsigned int *vs_count; /* call counts */ |
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u32 vs_xdrsize; /* xdrsize needed for this version */ |
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/* Don't register with rpcbind */ |
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bool vs_hidden; |
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/* Don't care if the rpcbind registration fails */ |
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bool vs_rpcb_optnl; |
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/* Need xprt with congestion control */ |
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bool vs_need_cong_ctrl; |
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/* Override dispatch function (e.g. when caching replies). |
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* A return value of 0 means drop the request. |
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* vs_dispatch == NULL means use default dispatcher. |
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*/ |
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int (*vs_dispatch)(struct svc_rqst *, __be32 *); |
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}; |
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/* |
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* RPC procedure info |
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*/ |
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struct svc_procedure { |
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/* process the request: */ |
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__be32 (*pc_func)(struct svc_rqst *); |
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/* XDR decode args: */ |
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int (*pc_decode)(struct svc_rqst *, __be32 *data); |
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/* XDR encode result: */ |
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int (*pc_encode)(struct svc_rqst *, __be32 *data); |
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/* XDR free result: */ |
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void (*pc_release)(struct svc_rqst *); |
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unsigned int pc_argsize; /* argument struct size */ |
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unsigned int pc_ressize; /* result struct size */ |
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unsigned int pc_cachetype; /* cache info (NFS) */ |
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unsigned int pc_xdrressize; /* maximum size of XDR reply */ |
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const char * pc_name; /* for display */ |
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}; |
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/* |
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* Mode for mapping cpus to pools. |
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*/ |
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enum { |
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SVC_POOL_AUTO = -1, /* choose one of the others */ |
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SVC_POOL_GLOBAL, /* no mapping, just a single global pool |
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* (legacy & UP mode) */ |
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SVC_POOL_PERCPU, /* one pool per cpu */ |
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SVC_POOL_PERNODE /* one pool per numa node */ |
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}; |
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struct svc_pool_map { |
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int count; /* How many svc_servs use us */ |
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int mode; /* Note: int not enum to avoid |
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* warnings about "enumeration value |
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* not handled in switch" */ |
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unsigned int npools; |
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unsigned int *pool_to; /* maps pool id to cpu or node */ |
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unsigned int *to_pool; /* maps cpu or node to pool id */ |
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}; |
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extern struct svc_pool_map svc_pool_map; |
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/* |
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* Function prototypes. |
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*/ |
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int svc_rpcb_setup(struct svc_serv *serv, struct net *net); |
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void svc_rpcb_cleanup(struct svc_serv *serv, struct net *net); |
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int svc_bind(struct svc_serv *serv, struct net *net); |
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struct svc_serv *svc_create(struct svc_program *, unsigned int, |
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const struct svc_serv_ops *); |
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struct svc_rqst *svc_rqst_alloc(struct svc_serv *serv, |
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struct svc_pool *pool, int node); |
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struct svc_rqst *svc_prepare_thread(struct svc_serv *serv, |
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struct svc_pool *pool, int node); |
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void svc_rqst_free(struct svc_rqst *); |
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void svc_exit_thread(struct svc_rqst *); |
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unsigned int svc_pool_map_get(void); |
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void svc_pool_map_put(void); |
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struct svc_serv * svc_create_pooled(struct svc_program *, unsigned int, |
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const struct svc_serv_ops *); |
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int svc_set_num_threads(struct svc_serv *, struct svc_pool *, int); |
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int svc_set_num_threads_sync(struct svc_serv *, struct svc_pool *, int); |
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int svc_pool_stats_open(struct svc_serv *serv, struct file *file); |
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void svc_destroy(struct svc_serv *); |
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void svc_shutdown_net(struct svc_serv *, struct net *); |
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int svc_process(struct svc_rqst *); |
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int bc_svc_process(struct svc_serv *, struct rpc_rqst *, |
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struct svc_rqst *); |
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int svc_register(const struct svc_serv *, struct net *, const int, |
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const unsigned short, const unsigned short); |
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|
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void svc_wake_up(struct svc_serv *); |
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void svc_reserve(struct svc_rqst *rqstp, int space); |
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struct svc_pool * svc_pool_for_cpu(struct svc_serv *serv, int cpu); |
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char * svc_print_addr(struct svc_rqst *, char *, size_t); |
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int svc_encode_result_payload(struct svc_rqst *rqstp, |
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unsigned int offset, |
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unsigned int length); |
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unsigned int svc_fill_write_vector(struct svc_rqst *rqstp, |
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struct page **pages, |
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struct kvec *first, size_t total); |
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char *svc_fill_symlink_pathname(struct svc_rqst *rqstp, |
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struct kvec *first, void *p, |
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size_t total); |
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__be32 svc_return_autherr(struct svc_rqst *rqstp, __be32 auth_err); |
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__be32 svc_generic_init_request(struct svc_rqst *rqstp, |
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const struct svc_program *progp, |
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struct svc_process_info *procinfo); |
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int svc_generic_rpcbind_set(struct net *net, |
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const struct svc_program *progp, |
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u32 version, int family, |
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unsigned short proto, |
|
unsigned short port); |
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int svc_rpcbind_set_version(struct net *net, |
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const struct svc_program *progp, |
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u32 version, int family, |
|
unsigned short proto, |
|
unsigned short port); |
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|
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#define RPC_MAX_ADDRBUFLEN (63U) |
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|
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/* |
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* When we want to reduce the size of the reserved space in the response |
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* buffer, we need to take into account the size of any checksum data that |
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* may be at the end of the packet. This is difficult to determine exactly |
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* for all cases without actually generating the checksum, so we just use a |
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* static value. |
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*/ |
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static inline void svc_reserve_auth(struct svc_rqst *rqstp, int space) |
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{ |
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svc_reserve(rqstp, space + rqstp->rq_auth_slack); |
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} |
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|
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/** |
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* svcxdr_init_decode - Prepare an xdr_stream for svc Call decoding |
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* @rqstp: controlling server RPC transaction context |
|
* |
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*/ |
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static inline void svcxdr_init_decode(struct svc_rqst *rqstp) |
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{ |
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struct xdr_stream *xdr = &rqstp->rq_arg_stream; |
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struct kvec *argv = rqstp->rq_arg.head; |
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|
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xdr_init_decode(xdr, &rqstp->rq_arg, argv->iov_base, NULL); |
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xdr_set_scratch_page(xdr, rqstp->rq_scratch_page); |
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} |
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|
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#endif /* SUNRPC_SVC_H */
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