LCOV - code coverage report
Current view: top level - include/linux/sunrpc - svc.h (source / functions) Hit Total Coverage
Test: Real Lines: 0 31 0.0 %
Date: 2020-10-17 15:46:16 Functions: 0 1 0.0 %
Legend: Neither, QEMU, Real, Both Branches: 0 0 -

           Branch data     Line data    Source code
       1                 :            : /* SPDX-License-Identifier: GPL-2.0 */
       2                 :            : /*
       3                 :            :  * linux/include/linux/sunrpc/svc.h
       4                 :            :  *
       5                 :            :  * RPC server declarations.
       6                 :            :  *
       7                 :            :  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
       8                 :            :  */
       9                 :            : 
      10                 :            : 
      11                 :            : #ifndef SUNRPC_SVC_H
      12                 :            : #define SUNRPC_SVC_H
      13                 :            : 
      14                 :            : #include <linux/in.h>
      15                 :            : #include <linux/in6.h>
      16                 :            : #include <linux/sunrpc/types.h>
      17                 :            : #include <linux/sunrpc/xdr.h>
      18                 :            : #include <linux/sunrpc/auth.h>
      19                 :            : #include <linux/sunrpc/svcauth.h>
      20                 :            : #include <linux/wait.h>
      21                 :            : #include <linux/mm.h>
      22                 :            : 
      23                 :            : /* statistics for svc_pool structures */
      24                 :            : struct svc_pool_stats {
      25                 :            :         atomic_long_t   packets;
      26                 :            :         unsigned long   sockets_queued;
      27                 :            :         atomic_long_t   threads_woken;
      28                 :            :         atomic_long_t   threads_timedout;
      29                 :            : };
      30                 :            : 
      31                 :            : /*
      32                 :            :  *
      33                 :            :  * RPC service thread pool.
      34                 :            :  *
      35                 :            :  * Pool of threads and temporary sockets.  Generally there is only
      36                 :            :  * a single one of these per RPC service, but on NUMA machines those
      37                 :            :  * services that can benefit from it (i.e. nfs but not lockd) will
      38                 :            :  * have one pool per NUMA node.  This optimisation reduces cross-
      39                 :            :  * node traffic on multi-node NUMA NFS servers.
      40                 :            :  */
      41                 :            : struct svc_pool {
      42                 :            :         unsigned int            sp_id;          /* pool id; also node id on NUMA */
      43                 :            :         spinlock_t              sp_lock;        /* protects all fields */
      44                 :            :         struct list_head        sp_sockets;     /* pending sockets */
      45                 :            :         unsigned int            sp_nrthreads;   /* # of threads in pool */
      46                 :            :         struct list_head        sp_all_threads; /* all server threads */
      47                 :            :         struct svc_pool_stats   sp_stats;       /* statistics on pool operation */
      48                 :            : #define SP_TASK_PENDING         (0)             /* still work to do even if no
      49                 :            :                                                  * xprt is queued. */
      50                 :            : #define SP_CONGESTED            (1)
      51                 :            :         unsigned long           sp_flags;
      52                 :            : } ____cacheline_aligned_in_smp;
      53                 :            : 
      54                 :            : struct svc_serv;
      55                 :            : 
      56                 :            : struct svc_serv_ops {
      57                 :            :         /* Callback to use when last thread exits. */
      58                 :            :         void            (*svo_shutdown)(struct svc_serv *, struct net *);
      59                 :            : 
      60                 :            :         /* function for service threads to run */
      61                 :            :         int             (*svo_function)(void *);
      62                 :            : 
      63                 :            :         /* queue up a transport for servicing */
      64                 :            :         void            (*svo_enqueue_xprt)(struct svc_xprt *);
      65                 :            : 
      66                 :            :         /* set up thread (or whatever) execution context */
      67                 :            :         int             (*svo_setup)(struct svc_serv *, struct svc_pool *, int);
      68                 :            : 
      69                 :            :         /* optional module to count when adding threads (pooled svcs only) */
      70                 :            :         struct module   *svo_module;
      71                 :            : };
      72                 :            : 
      73                 :            : /*
      74                 :            :  * RPC service.
      75                 :            :  *
      76                 :            :  * An RPC service is a ``daemon,'' possibly multithreaded, which
      77                 :            :  * receives and processes incoming RPC messages.
      78                 :            :  * It has one or more transport sockets associated with it, and maintains
      79                 :            :  * a list of idle threads waiting for input.
      80                 :            :  *
      81                 :            :  * We currently do not support more than one RPC program per daemon.
      82                 :            :  */
      83                 :            : struct svc_serv {
      84                 :            :         struct svc_program *    sv_program;     /* RPC program */
      85                 :            :         struct svc_stat *       sv_stats;       /* RPC statistics */
      86                 :            :         spinlock_t              sv_lock;
      87                 :            :         unsigned int            sv_nrthreads;   /* # of server threads */
      88                 :            :         unsigned int            sv_maxconn;     /* max connections allowed or
      89                 :            :                                                  * '0' causing max to be based
      90                 :            :                                                  * on number of threads. */
      91                 :            : 
      92                 :            :         unsigned int            sv_max_payload; /* datagram payload size */
      93                 :            :         unsigned int            sv_max_mesg;    /* max_payload + 1 page for overheads */
      94                 :            :         unsigned int            sv_xdrsize;     /* XDR buffer size */
      95                 :            :         struct list_head        sv_permsocks;   /* all permanent sockets */
      96                 :            :         struct list_head        sv_tempsocks;   /* all temporary sockets */
      97                 :            :         int                     sv_tmpcnt;      /* count of temporary sockets */
      98                 :            :         struct timer_list       sv_temptimer;   /* timer for aging temporary sockets */
      99                 :            : 
     100                 :            :         char *                  sv_name;        /* service name */
     101                 :            : 
     102                 :            :         unsigned int            sv_nrpools;     /* number of thread pools */
     103                 :            :         struct svc_pool *       sv_pools;       /* array of thread pools */
     104                 :            :         const struct svc_serv_ops *sv_ops;      /* server operations */
     105                 :            : #if defined(CONFIG_SUNRPC_BACKCHANNEL)
     106                 :            :         struct list_head        sv_cb_list;     /* queue for callback requests
     107                 :            :                                                  * that arrive over the same
     108                 :            :                                                  * connection */
     109                 :            :         spinlock_t              sv_cb_lock;     /* protects the svc_cb_list */
     110                 :            :         wait_queue_head_t       sv_cb_waitq;    /* sleep here if there are no
     111                 :            :                                                  * entries in the svc_cb_list */
     112                 :            :         bool                    sv_bc_enabled;  /* service uses backchannel */
     113                 :            : #endif /* CONFIG_SUNRPC_BACKCHANNEL */
     114                 :            : };
     115                 :            : 
     116                 :            : /*
     117                 :            :  * We use sv_nrthreads as a reference count.  svc_destroy() drops
     118                 :            :  * this refcount, so we need to bump it up around operations that
     119                 :            :  * change the number of threads.  Horrible, but there it is.
     120                 :            :  * Should be called with the "service mutex" held.
     121                 :            :  */
     122                 :            : static inline void svc_get(struct svc_serv *serv)
     123                 :            : {
     124                 :          0 :         serv->sv_nrthreads++;
     125                 :            : }
     126                 :            : 
     127                 :            : /*
     128                 :            :  * Maximum payload size supported by a kernel RPC server.
     129                 :            :  * This is use to determine the max number of pages nfsd is
     130                 :            :  * willing to return in a single READ operation.
     131                 :            :  *
     132                 :            :  * These happen to all be powers of 2, which is not strictly
     133                 :            :  * necessary but helps enforce the real limitation, which is
     134                 :            :  * that they should be multiples of PAGE_SIZE.
     135                 :            :  *
     136                 :            :  * For UDP transports, a block plus NFS,RPC, and UDP headers
     137                 :            :  * has to fit into the IP datagram limit of 64K.  The largest
     138                 :            :  * feasible number for all known page sizes is probably 48K,
     139                 :            :  * but we choose 32K here.  This is the same as the historical
     140                 :            :  * Linux limit; someone who cares more about NFS/UDP performance
     141                 :            :  * can test a larger number.
     142                 :            :  *
     143                 :            :  * For TCP transports we have more freedom.  A size of 1MB is
     144                 :            :  * chosen to match the client limit.  Other OSes are known to
     145                 :            :  * have larger limits, but those numbers are probably beyond
     146                 :            :  * the point of diminishing returns.
     147                 :            :  */
     148                 :            : #define RPCSVC_MAXPAYLOAD       (1*1024*1024u)
     149                 :            : #define RPCSVC_MAXPAYLOAD_TCP   RPCSVC_MAXPAYLOAD
     150                 :            : #define RPCSVC_MAXPAYLOAD_UDP   (32*1024u)
     151                 :            : 
     152                 :            : extern u32 svc_max_payload(const struct svc_rqst *rqstp);
     153                 :            : 
     154                 :            : /*
     155                 :            :  * RPC Requsts and replies are stored in one or more pages.
     156                 :            :  * We maintain an array of pages for each server thread.
     157                 :            :  * Requests are copied into these pages as they arrive.  Remaining
     158                 :            :  * pages are available to write the reply into.
     159                 :            :  *
     160                 :            :  * Pages are sent using ->sendpage so each server thread needs to
     161                 :            :  * allocate more to replace those used in sending.  To help keep track
     162                 :            :  * of these pages we have a receive list where all pages initialy live,
     163                 :            :  * and a send list where pages are moved to when there are to be part
     164                 :            :  * of a reply.
     165                 :            :  *
     166                 :            :  * We use xdr_buf for holding responses as it fits well with NFS
     167                 :            :  * read responses (that have a header, and some data pages, and possibly
     168                 :            :  * a tail) and means we can share some client side routines.
     169                 :            :  *
     170                 :            :  * The xdr_buf.head kvec always points to the first page in the rq_*pages
     171                 :            :  * list.  The xdr_buf.pages pointer points to the second page on that
     172                 :            :  * list.  xdr_buf.tail points to the end of the first page.
     173                 :            :  * This assumes that the non-page part of an rpc reply will fit
     174                 :            :  * in a page - NFSd ensures this.  lockd also has no trouble.
     175                 :            :  *
     176                 :            :  * Each request/reply pair can have at most one "payload", plus two pages,
     177                 :            :  * one for the request, and one for the reply.
     178                 :            :  * We using ->sendfile to return read data, we might need one extra page
     179                 :            :  * if the request is not page-aligned.  So add another '1'.
     180                 :            :  */
     181                 :            : #define RPCSVC_MAXPAGES         ((RPCSVC_MAXPAYLOAD+PAGE_SIZE-1)/PAGE_SIZE \
     182                 :            :                                 + 2 + 1)
     183                 :            : 
     184                 :            : static inline u32 svc_getnl(struct kvec *iov)
     185                 :            : {
     186                 :            :         __be32 val, *vp;
     187                 :          0 :         vp = iov->iov_base;
     188                 :          0 :         val = *vp++;
     189                 :          0 :         iov->iov_base = (void*)vp;
     190                 :          0 :         iov->iov_len -= sizeof(__be32);
     191                 :          0 :         return ntohl(val);
     192                 :            : }
     193                 :            : 
     194                 :            : static inline void svc_putnl(struct kvec *iov, u32 val)
     195                 :            : {
     196                 :          0 :         __be32 *vp = iov->iov_base + iov->iov_len;
     197                 :          0 :         *vp = htonl(val);
     198                 :          0 :         iov->iov_len += sizeof(__be32);
     199                 :            : }
     200                 :            : 
     201                 :            : static inline __be32 svc_getu32(struct kvec *iov)
     202                 :            : {
     203                 :            :         __be32 val, *vp;
     204                 :          0 :         vp = iov->iov_base;
     205                 :          0 :         val = *vp++;
     206                 :          0 :         iov->iov_base = (void*)vp;
     207                 :          0 :         iov->iov_len -= sizeof(__be32);
     208                 :            :         return val;
     209                 :            : }
     210                 :            : 
     211                 :            : static inline void svc_ungetu32(struct kvec *iov)
     212                 :            : {
     213                 :            :         __be32 *vp = (__be32 *)iov->iov_base;
     214                 :            :         iov->iov_base = (void *)(vp - 1);
     215                 :            :         iov->iov_len += sizeof(*vp);
     216                 :            : }
     217                 :            : 
     218                 :            : static inline void svc_putu32(struct kvec *iov, __be32 val)
     219                 :            : {
     220                 :          0 :         __be32 *vp = iov->iov_base + iov->iov_len;
     221                 :          0 :         *vp = val;
     222                 :          0 :         iov->iov_len += sizeof(__be32);
     223                 :            : }
     224                 :            : 
     225                 :            : /*
     226                 :            :  * The context of a single thread, including the request currently being
     227                 :            :  * processed.
     228                 :            :  */
     229                 :            : struct svc_rqst {
     230                 :            :         struct list_head        rq_all;         /* all threads list */
     231                 :            :         struct rcu_head         rq_rcu_head;    /* for RCU deferred kfree */
     232                 :            :         struct svc_xprt *       rq_xprt;        /* transport ptr */
     233                 :            : 
     234                 :            :         struct sockaddr_storage rq_addr;        /* peer address */
     235                 :            :         size_t                  rq_addrlen;
     236                 :            :         struct sockaddr_storage rq_daddr;       /* dest addr of request
     237                 :            :                                                  *  - reply from here */
     238                 :            :         size_t                  rq_daddrlen;
     239                 :            : 
     240                 :            :         struct svc_serv *       rq_server;      /* RPC service definition */
     241                 :            :         struct svc_pool *       rq_pool;        /* thread pool */
     242                 :            :         const struct svc_procedure *rq_procinfo;/* procedure info */
     243                 :            :         struct auth_ops *       rq_authop;      /* authentication flavour */
     244                 :            :         struct svc_cred         rq_cred;        /* auth info */
     245                 :            :         void *                  rq_xprt_ctxt;   /* transport specific context ptr */
     246                 :            :         struct svc_deferred_req*rq_deferred;    /* deferred request we are replaying */
     247                 :            : 
     248                 :            :         size_t                  rq_xprt_hlen;   /* xprt header len */
     249                 :            :         struct xdr_buf          rq_arg;
     250                 :            :         struct xdr_buf          rq_res;
     251                 :            :         struct page             *rq_pages[RPCSVC_MAXPAGES + 1];
     252                 :            :         struct page *           *rq_respages;   /* points into rq_pages */
     253                 :            :         struct page *           *rq_next_page; /* next reply page to use */
     254                 :            :         struct page *           *rq_page_end;  /* one past the last page */
     255                 :            : 
     256                 :            :         struct kvec             rq_vec[RPCSVC_MAXPAGES]; /* generally useful.. */
     257                 :            : 
     258                 :            :         __be32                  rq_xid;         /* transmission id */
     259                 :            :         u32                     rq_prog;        /* program number */
     260                 :            :         u32                     rq_vers;        /* program version */
     261                 :            :         u32                     rq_proc;        /* procedure number */
     262                 :            :         u32                     rq_prot;        /* IP protocol */
     263                 :            :         int                     rq_cachetype;   /* catering to nfsd */
     264                 :            : #define RQ_SECURE       (0)                     /* secure port */
     265                 :            : #define RQ_LOCAL        (1)                     /* local request */
     266                 :            : #define RQ_USEDEFERRAL  (2)                     /* use deferral */
     267                 :            : #define RQ_DROPME       (3)                     /* drop current reply */
     268                 :            : #define RQ_SPLICE_OK    (4)                     /* turned off in gss privacy
     269                 :            :                                                  * to prevent encrypting page
     270                 :            :                                                  * cache pages */
     271                 :            : #define RQ_VICTIM       (5)                     /* about to be shut down */
     272                 :            : #define RQ_BUSY         (6)                     /* request is busy */
     273                 :            : #define RQ_DATA         (7)                     /* request has data */
     274                 :            : #define RQ_AUTHERR      (8)                     /* Request status is auth error */
     275                 :            :         unsigned long           rq_flags;       /* flags field */
     276                 :            :         ktime_t                 rq_qtime;       /* enqueue time */
     277                 :            : 
     278                 :            :         void *                  rq_argp;        /* decoded arguments */
     279                 :            :         void *                  rq_resp;        /* xdr'd results */
     280                 :            :         void *                  rq_auth_data;   /* flavor-specific data */
     281                 :            :         int                     rq_auth_slack;  /* extra space xdr code
     282                 :            :                                                  * should leave in head
     283                 :            :                                                  * for krb5i, krb5p.
     284                 :            :                                                  */
     285                 :            :         int                     rq_reserved;    /* space on socket outq
     286                 :            :                                                  * reserved for this request
     287                 :            :                                                  */
     288                 :            :         ktime_t                 rq_stime;       /* start time */
     289                 :            : 
     290                 :            :         struct cache_req        rq_chandle;     /* handle passed to caches for 
     291                 :            :                                                  * request delaying 
     292                 :            :                                                  */
     293                 :            :         /* Catering to nfsd */
     294                 :            :         struct auth_domain *    rq_client;      /* RPC peer info */
     295                 :            :         struct auth_domain *    rq_gssclient;   /* "gss/"-style peer info */
     296                 :            :         struct svc_cacherep *   rq_cacherep;    /* cache info */
     297                 :            :         struct task_struct      *rq_task;       /* service thread */
     298                 :            :         spinlock_t              rq_lock;        /* per-request lock */
     299                 :            :         struct net              *rq_bc_net;     /* pointer to backchannel's
     300                 :            :                                                  * net namespace
     301                 :            :                                                  */
     302                 :            : };
     303                 :            : 
     304                 :            : #define SVC_NET(rqst) (rqst->rq_xprt ? rqst->rq_xprt->xpt_net : rqst->rq_bc_net)
     305                 :            : 
     306                 :            : /*
     307                 :            :  * Rigorous type checking on sockaddr type conversions
     308                 :            :  */
     309                 :            : static inline struct sockaddr_in *svc_addr_in(const struct svc_rqst *rqst)
     310                 :            : {
     311                 :            :         return (struct sockaddr_in *) &rqst->rq_addr;
     312                 :            : }
     313                 :            : 
     314                 :            : static inline struct sockaddr_in6 *svc_addr_in6(const struct svc_rqst *rqst)
     315                 :            : {
     316                 :          0 :         return (struct sockaddr_in6 *) &rqst->rq_addr;
     317                 :            : }
     318                 :            : 
     319                 :            : static inline struct sockaddr *svc_addr(const struct svc_rqst *rqst)
     320                 :            : {
     321                 :          0 :         return (struct sockaddr *) &rqst->rq_addr;
     322                 :            : }
     323                 :            : 
     324                 :            : static inline struct sockaddr_in *svc_daddr_in(const struct svc_rqst *rqst)
     325                 :            : {
     326                 :            :         return (struct sockaddr_in *) &rqst->rq_daddr;
     327                 :            : }
     328                 :            : 
     329                 :            : static inline struct sockaddr_in6 *svc_daddr_in6(const struct svc_rqst *rqst)
     330                 :            : {
     331                 :            :         return (struct sockaddr_in6 *) &rqst->rq_daddr;
     332                 :            : }
     333                 :            : 
     334                 :            : static inline struct sockaddr *svc_daddr(const struct svc_rqst *rqst)
     335                 :            : {
     336                 :          0 :         return (struct sockaddr *) &rqst->rq_daddr;
     337                 :            : }
     338                 :            : 
     339                 :            : /*
     340                 :            :  * Check buffer bounds after decoding arguments
     341                 :            :  */
     342                 :            : static inline int
     343                 :            : xdr_argsize_check(struct svc_rqst *rqstp, __be32 *p)
     344                 :            : {
     345                 :            :         char *cp = (char *)p;
     346                 :            :         struct kvec *vec = &rqstp->rq_arg.head[0];
     347                 :          0 :         return cp >= (char*)vec->iov_base
     348                 :          0 :                 && cp <= (char*)vec->iov_base + vec->iov_len;
     349                 :            : }
     350                 :            : 
     351                 :            : static inline int
     352                 :            : xdr_ressize_check(struct svc_rqst *rqstp, __be32 *p)
     353                 :            : {
     354                 :            :         struct kvec *vec = &rqstp->rq_res.head[0];
     355                 :            :         char *cp = (char*)p;
     356                 :            : 
     357                 :          0 :         vec->iov_len = cp - (char*)vec->iov_base;
     358                 :            : 
     359                 :          0 :         return vec->iov_len <= PAGE_SIZE;
     360                 :            : }
     361                 :            : 
     362                 :          0 : static inline void svc_free_res_pages(struct svc_rqst *rqstp)
     363                 :            : {
     364                 :          0 :         while (rqstp->rq_next_page != rqstp->rq_respages) {
     365                 :          0 :                 struct page **pp = --rqstp->rq_next_page;
     366                 :          0 :                 if (*pp) {
     367                 :          0 :                         put_page(*pp);
     368                 :          0 :                         *pp = NULL;
     369                 :            :                 }
     370                 :            :         }
     371                 :          0 : }
     372                 :            : 
     373                 :            : struct svc_deferred_req {
     374                 :            :         u32                     prot;   /* protocol (UDP or TCP) */
     375                 :            :         struct svc_xprt         *xprt;
     376                 :            :         struct sockaddr_storage addr;   /* where reply must go */
     377                 :            :         size_t                  addrlen;
     378                 :            :         struct sockaddr_storage daddr;  /* where reply must come from */
     379                 :            :         size_t                  daddrlen;
     380                 :            :         struct cache_deferred_req handle;
     381                 :            :         size_t                  xprt_hlen;
     382                 :            :         int                     argslen;
     383                 :            :         __be32                  args[0];
     384                 :            : };
     385                 :            : 
     386                 :            : struct svc_process_info {
     387                 :            :         union {
     388                 :            :                 int  (*dispatch)(struct svc_rqst *, __be32 *);
     389                 :            :                 struct {
     390                 :            :                         unsigned int lovers;
     391                 :            :                         unsigned int hivers;
     392                 :            :                 } mismatch;
     393                 :            :         };
     394                 :            : };
     395                 :            : 
     396                 :            : /*
     397                 :            :  * List of RPC programs on the same transport endpoint
     398                 :            :  */
     399                 :            : struct svc_program {
     400                 :            :         struct svc_program *    pg_next;        /* other programs (same xprt) */
     401                 :            :         u32                     pg_prog;        /* program number */
     402                 :            :         unsigned int            pg_lovers;      /* lowest version */
     403                 :            :         unsigned int            pg_hivers;      /* highest version */
     404                 :            :         unsigned int            pg_nvers;       /* number of versions */
     405                 :            :         const struct svc_version **pg_vers;     /* version array */
     406                 :            :         char *                  pg_name;        /* service name */
     407                 :            :         char *                  pg_class;       /* class name: services sharing authentication */
     408                 :            :         struct svc_stat *       pg_stats;       /* rpc statistics */
     409                 :            :         int                     (*pg_authenticate)(struct svc_rqst *);
     410                 :            :         __be32                  (*pg_init_request)(struct svc_rqst *,
     411                 :            :                                                    const struct svc_program *,
     412                 :            :                                                    struct svc_process_info *);
     413                 :            :         int                     (*pg_rpcbind_set)(struct net *net,
     414                 :            :                                                   const struct svc_program *,
     415                 :            :                                                   u32 version, int family,
     416                 :            :                                                   unsigned short proto,
     417                 :            :                                                   unsigned short port);
     418                 :            : };
     419                 :            : 
     420                 :            : /*
     421                 :            :  * RPC program version
     422                 :            :  */
     423                 :            : struct svc_version {
     424                 :            :         u32                     vs_vers;        /* version number */
     425                 :            :         u32                     vs_nproc;       /* number of procedures */
     426                 :            :         const struct svc_procedure *vs_proc;    /* per-procedure info */
     427                 :            :         unsigned int            *vs_count;      /* call counts */
     428                 :            :         u32                     vs_xdrsize;     /* xdrsize needed for this version */
     429                 :            : 
     430                 :            :         /* Don't register with rpcbind */
     431                 :            :         bool                    vs_hidden;
     432                 :            : 
     433                 :            :         /* Don't care if the rpcbind registration fails */
     434                 :            :         bool                    vs_rpcb_optnl;
     435                 :            : 
     436                 :            :         /* Need xprt with congestion control */
     437                 :            :         bool                    vs_need_cong_ctrl;
     438                 :            : 
     439                 :            :         /* Override dispatch function (e.g. when caching replies).
     440                 :            :          * A return value of 0 means drop the request. 
     441                 :            :          * vs_dispatch == NULL means use default dispatcher.
     442                 :            :          */
     443                 :            :         int                     (*vs_dispatch)(struct svc_rqst *, __be32 *);
     444                 :            : };
     445                 :            : 
     446                 :            : /*
     447                 :            :  * RPC procedure info
     448                 :            :  */
     449                 :            : struct svc_procedure {
     450                 :            :         /* process the request: */
     451                 :            :         __be32                  (*pc_func)(struct svc_rqst *);
     452                 :            :         /* XDR decode args: */
     453                 :            :         int                     (*pc_decode)(struct svc_rqst *, __be32 *data);
     454                 :            :         /* XDR encode result: */
     455                 :            :         int                     (*pc_encode)(struct svc_rqst *, __be32 *data);
     456                 :            :         /* XDR free result: */
     457                 :            :         void                    (*pc_release)(struct svc_rqst *);
     458                 :            :         unsigned int            pc_argsize;     /* argument struct size */
     459                 :            :         unsigned int            pc_ressize;     /* result struct size */
     460                 :            :         unsigned int            pc_cachetype;   /* cache info (NFS) */
     461                 :            :         unsigned int            pc_xdrressize;  /* maximum size of XDR reply */
     462                 :            : };
     463                 :            : 
     464                 :            : /*
     465                 :            :  * Mode for mapping cpus to pools.
     466                 :            :  */
     467                 :            : enum {
     468                 :            :         SVC_POOL_AUTO = -1,     /* choose one of the others */
     469                 :            :         SVC_POOL_GLOBAL,        /* no mapping, just a single global pool
     470                 :            :                                  * (legacy & UP mode) */
     471                 :            :         SVC_POOL_PERCPU,        /* one pool per cpu */
     472                 :            :         SVC_POOL_PERNODE        /* one pool per numa node */
     473                 :            : };
     474                 :            : 
     475                 :            : struct svc_pool_map {
     476                 :            :         int count;                      /* How many svc_servs use us */
     477                 :            :         int mode;                       /* Note: int not enum to avoid
     478                 :            :                                          * warnings about "enumeration value
     479                 :            :                                          * not handled in switch" */
     480                 :            :         unsigned int npools;
     481                 :            :         unsigned int *pool_to;          /* maps pool id to cpu or node */
     482                 :            :         unsigned int *to_pool;          /* maps cpu or node to pool id */
     483                 :            : };
     484                 :            : 
     485                 :            : extern struct svc_pool_map svc_pool_map;
     486                 :            : 
     487                 :            : /*
     488                 :            :  * Function prototypes.
     489                 :            :  */
     490                 :            : int svc_rpcb_setup(struct svc_serv *serv, struct net *net);
     491                 :            : void svc_rpcb_cleanup(struct svc_serv *serv, struct net *net);
     492                 :            : int svc_bind(struct svc_serv *serv, struct net *net);
     493                 :            : struct svc_serv *svc_create(struct svc_program *, unsigned int,
     494                 :            :                             const struct svc_serv_ops *);
     495                 :            : struct svc_rqst *svc_rqst_alloc(struct svc_serv *serv,
     496                 :            :                                         struct svc_pool *pool, int node);
     497                 :            : struct svc_rqst *svc_prepare_thread(struct svc_serv *serv,
     498                 :            :                                         struct svc_pool *pool, int node);
     499                 :            : void               svc_rqst_free(struct svc_rqst *);
     500                 :            : void               svc_exit_thread(struct svc_rqst *);
     501                 :            : unsigned int       svc_pool_map_get(void);
     502                 :            : void               svc_pool_map_put(void);
     503                 :            : struct svc_serv *  svc_create_pooled(struct svc_program *, unsigned int,
     504                 :            :                         const struct svc_serv_ops *);
     505                 :            : int                svc_set_num_threads(struct svc_serv *, struct svc_pool *, int);
     506                 :            : int                svc_set_num_threads_sync(struct svc_serv *, struct svc_pool *, int);
     507                 :            : int                svc_pool_stats_open(struct svc_serv *serv, struct file *file);
     508                 :            : void               svc_destroy(struct svc_serv *);
     509                 :            : void               svc_shutdown_net(struct svc_serv *, struct net *);
     510                 :            : int                svc_process(struct svc_rqst *);
     511                 :            : int                bc_svc_process(struct svc_serv *, struct rpc_rqst *,
     512                 :            :                         struct svc_rqst *);
     513                 :            : int                svc_register(const struct svc_serv *, struct net *, const int,
     514                 :            :                                 const unsigned short, const unsigned short);
     515                 :            : 
     516                 :            : void               svc_wake_up(struct svc_serv *);
     517                 :            : void               svc_reserve(struct svc_rqst *rqstp, int space);
     518                 :            : struct svc_pool *  svc_pool_for_cpu(struct svc_serv *serv, int cpu);
     519                 :            : char *             svc_print_addr(struct svc_rqst *, char *, size_t);
     520                 :            : int                svc_encode_read_payload(struct svc_rqst *rqstp,
     521                 :            :                                            unsigned int offset,
     522                 :            :                                            unsigned int length);
     523                 :            : unsigned int       svc_fill_write_vector(struct svc_rqst *rqstp,
     524                 :            :                                          struct page **pages,
     525                 :            :                                          struct kvec *first, size_t total);
     526                 :            : char              *svc_fill_symlink_pathname(struct svc_rqst *rqstp,
     527                 :            :                                              struct kvec *first, void *p,
     528                 :            :                                              size_t total);
     529                 :            : __be32             svc_return_autherr(struct svc_rqst *rqstp, __be32 auth_err);
     530                 :            : __be32             svc_generic_init_request(struct svc_rqst *rqstp,
     531                 :            :                                             const struct svc_program *progp,
     532                 :            :                                             struct svc_process_info *procinfo);
     533                 :            : int                svc_generic_rpcbind_set(struct net *net,
     534                 :            :                                            const struct svc_program *progp,
     535                 :            :                                            u32 version, int family,
     536                 :            :                                            unsigned short proto,
     537                 :            :                                            unsigned short port);
     538                 :            : int                svc_rpcbind_set_version(struct net *net,
     539                 :            :                                            const struct svc_program *progp,
     540                 :            :                                            u32 version, int family,
     541                 :            :                                            unsigned short proto,
     542                 :            :                                            unsigned short port);
     543                 :            : 
     544                 :            : #define RPC_MAX_ADDRBUFLEN      (63U)
     545                 :            : 
     546                 :            : /*
     547                 :            :  * When we want to reduce the size of the reserved space in the response
     548                 :            :  * buffer, we need to take into account the size of any checksum data that
     549                 :            :  * may be at the end of the packet. This is difficult to determine exactly
     550                 :            :  * for all cases without actually generating the checksum, so we just use a
     551                 :            :  * static value.
     552                 :            :  */
     553                 :            : static inline void svc_reserve_auth(struct svc_rqst *rqstp, int space)
     554                 :            : {
     555                 :          0 :         svc_reserve(rqstp, space + rqstp->rq_auth_slack);
     556                 :            : }
     557                 :            : 
     558                 :            : #endif /* SUNRPC_SVC_H */
    

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