android_kernel_motorola_sm6225/include/linux/sunrpc/svc.h
J. Bruce Fields 1918e34138 [PATCH] svcrpc: save and restore the daddr field when request deferred
The server code currently keeps track of the destination address on every
request so that it can reply using the same address.  However we forget to do
that in the case of a deferred request.  Remedy this oversight.  >From folks
at PolyServe.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-18 19:20:24 -08:00

320 lines
9.5 KiB
C

/*
* linux/include/linux/sunrpc/svc.h
*
* RPC server declarations.
*
* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
*/
#ifndef SUNRPC_SVC_H
#define SUNRPC_SVC_H
#include <linux/in.h>
#include <linux/sunrpc/types.h>
#include <linux/sunrpc/xdr.h>
#include <linux/sunrpc/svcauth.h>
#include <linux/wait.h>
#include <linux/mm.h>
/*
* RPC service.
*
* An RPC service is a ``daemon,'' possibly multithreaded, which
* receives and processes incoming RPC messages.
* It has one or more transport sockets associated with it, and maintains
* a list of idle threads waiting for input.
*
* We currently do not support more than one RPC program per daemon.
*/
struct svc_serv {
struct list_head sv_threads; /* idle server threads */
struct list_head sv_sockets; /* pending sockets */
struct svc_program * sv_program; /* RPC program */
struct svc_stat * sv_stats; /* RPC statistics */
spinlock_t sv_lock;
unsigned int sv_nrthreads; /* # of server threads */
unsigned int sv_bufsz; /* datagram buffer size */
unsigned int sv_xdrsize; /* XDR buffer size */
struct list_head sv_permsocks; /* all permanent sockets */
struct list_head sv_tempsocks; /* all temporary sockets */
int sv_tmpcnt; /* count of temporary sockets */
char * sv_name; /* service name */
};
/*
* Maximum payload size supported by a kernel RPC server.
* This is use to determine the max number of pages nfsd is
* willing to return in a single READ operation.
*/
#define RPCSVC_MAXPAYLOAD (64*1024u)
/*
* RPC Requsts and replies are stored in one or more pages.
* We maintain an array of pages for each server thread.
* Requests are copied into these pages as they arrive. Remaining
* pages are available to write the reply into.
*
* Pages are sent using ->sendpage so each server thread needs to
* allocate more to replace those used in sending. To help keep track
* of these pages we have a receive list where all pages initialy live,
* and a send list where pages are moved to when there are to be part
* of a reply.
*
* We use xdr_buf for holding responses as it fits well with NFS
* read responses (that have a header, and some data pages, and possibly
* a tail) and means we can share some client side routines.
*
* The xdr_buf.head kvec always points to the first page in the rq_*pages
* list. The xdr_buf.pages pointer points to the second page on that
* list. xdr_buf.tail points to the end of the first page.
* This assumes that the non-page part of an rpc reply will fit
* in a page - NFSd ensures this. lockd also has no trouble.
*
* Each request/reply pair can have at most one "payload", plus two pages,
* one for the request, and one for the reply.
*/
#define RPCSVC_MAXPAGES ((RPCSVC_MAXPAYLOAD+PAGE_SIZE-1)/PAGE_SIZE + 2)
static inline u32 svc_getu32(struct kvec *iov)
{
u32 val, *vp;
vp = iov->iov_base;
val = *vp++;
iov->iov_base = (void*)vp;
iov->iov_len -= sizeof(u32);
return val;
}
static inline void svc_ungetu32(struct kvec *iov)
{
u32 *vp = (u32 *)iov->iov_base;
iov->iov_base = (void *)(vp - 1);
iov->iov_len += sizeof(*vp);
}
static inline void svc_putu32(struct kvec *iov, u32 val)
{
u32 *vp = iov->iov_base + iov->iov_len;
*vp = val;
iov->iov_len += sizeof(u32);
}
/*
* The context of a single thread, including the request currently being
* processed.
* NOTE: First two items must be prev/next.
*/
struct svc_rqst {
struct list_head rq_list; /* idle list */
struct svc_sock * rq_sock; /* socket */
struct sockaddr_in rq_addr; /* peer address */
int rq_addrlen;
struct svc_serv * rq_server; /* RPC service definition */
struct svc_procedure * rq_procinfo; /* procedure info */
struct auth_ops * rq_authop; /* authentication flavour */
struct svc_cred rq_cred; /* auth info */
struct sk_buff * rq_skbuff; /* fast recv inet buffer */
struct svc_deferred_req*rq_deferred; /* deferred request we are replaying */
struct xdr_buf rq_arg;
struct xdr_buf rq_res;
struct page * rq_argpages[RPCSVC_MAXPAGES];
struct page * rq_respages[RPCSVC_MAXPAGES];
int rq_restailpage;
short rq_argused; /* pages used for argument */
short rq_arghi; /* pages available in argument page list */
short rq_resused; /* pages used for result */
u32 rq_xid; /* transmission id */
u32 rq_prog; /* program number */
u32 rq_vers; /* program version */
u32 rq_proc; /* procedure number */
u32 rq_prot; /* IP protocol */
unsigned short
rq_secure : 1; /* secure port */
__u32 rq_daddr; /* dest addr of request - reply from here */
void * rq_argp; /* decoded arguments */
void * rq_resp; /* xdr'd results */
void * rq_auth_data; /* flavor-specific data */
int rq_reserved; /* space on socket outq
* reserved for this request
*/
struct cache_req rq_chandle; /* handle passed to caches for
* request delaying
*/
/* Catering to nfsd */
struct auth_domain * rq_client; /* RPC peer info */
struct svc_cacherep * rq_cacherep; /* cache info */
struct knfsd_fh * rq_reffh; /* Referrence filehandle, used to
* determine what device number
* to report (real or virtual)
*/
wait_queue_head_t rq_wait; /* synchronization */
};
/*
* Check buffer bounds after decoding arguments
*/
static inline int
xdr_argsize_check(struct svc_rqst *rqstp, u32 *p)
{
char *cp = (char *)p;
struct kvec *vec = &rqstp->rq_arg.head[0];
return cp >= (char*)vec->iov_base
&& cp <= (char*)vec->iov_base + vec->iov_len;
}
static inline int
xdr_ressize_check(struct svc_rqst *rqstp, u32 *p)
{
struct kvec *vec = &rqstp->rq_res.head[0];
char *cp = (char*)p;
vec->iov_len = cp - (char*)vec->iov_base;
return vec->iov_len <= PAGE_SIZE;
}
static inline struct page *
svc_take_res_page(struct svc_rqst *rqstp)
{
if (rqstp->rq_arghi <= rqstp->rq_argused)
return NULL;
rqstp->rq_arghi--;
rqstp->rq_respages[rqstp->rq_resused] =
rqstp->rq_argpages[rqstp->rq_arghi];
return rqstp->rq_respages[rqstp->rq_resused++];
}
static inline int svc_take_page(struct svc_rqst *rqstp)
{
if (rqstp->rq_arghi <= rqstp->rq_argused)
return -ENOMEM;
rqstp->rq_arghi--;
rqstp->rq_respages[rqstp->rq_resused] =
rqstp->rq_argpages[rqstp->rq_arghi];
rqstp->rq_resused++;
return 0;
}
static inline void svc_pushback_allpages(struct svc_rqst *rqstp)
{
while (rqstp->rq_resused) {
if (rqstp->rq_respages[--rqstp->rq_resused] == NULL)
continue;
rqstp->rq_argpages[rqstp->rq_arghi++] =
rqstp->rq_respages[rqstp->rq_resused];
rqstp->rq_respages[rqstp->rq_resused] = NULL;
}
}
static inline void svc_pushback_unused_pages(struct svc_rqst *rqstp)
{
while (rqstp->rq_resused &&
rqstp->rq_res.pages != &rqstp->rq_respages[rqstp->rq_resused]) {
if (rqstp->rq_respages[--rqstp->rq_resused] != NULL) {
rqstp->rq_argpages[rqstp->rq_arghi++] =
rqstp->rq_respages[rqstp->rq_resused];
rqstp->rq_respages[rqstp->rq_resused] = NULL;
}
}
}
static inline void svc_free_allpages(struct svc_rqst *rqstp)
{
while (rqstp->rq_resused) {
if (rqstp->rq_respages[--rqstp->rq_resused] == NULL)
continue;
put_page(rqstp->rq_respages[rqstp->rq_resused]);
rqstp->rq_respages[rqstp->rq_resused] = NULL;
}
}
struct svc_deferred_req {
u32 prot; /* protocol (UDP or TCP) */
struct sockaddr_in addr;
struct svc_sock *svsk; /* where reply must go */
u32 daddr; /* where reply must come from */
struct cache_deferred_req handle;
int argslen;
u32 args[0];
};
/*
* List of RPC programs on the same transport endpoint
*/
struct svc_program {
struct svc_program * pg_next; /* other programs (same xprt) */
u32 pg_prog; /* program number */
unsigned int pg_lovers; /* lowest version */
unsigned int pg_hivers; /* lowest version */
unsigned int pg_nvers; /* number of versions */
struct svc_version ** pg_vers; /* version array */
char * pg_name; /* service name */
char * pg_class; /* class name: services sharing authentication */
struct svc_stat * pg_stats; /* rpc statistics */
int (*pg_authenticate)(struct svc_rqst *);
};
/*
* RPC program version
*/
struct svc_version {
u32 vs_vers; /* version number */
u32 vs_nproc; /* number of procedures */
struct svc_procedure * vs_proc; /* per-procedure info */
u32 vs_xdrsize; /* xdrsize needed for this version */
/* Override dispatch function (e.g. when caching replies).
* A return value of 0 means drop the request.
* vs_dispatch == NULL means use default dispatcher.
*/
int (*vs_dispatch)(struct svc_rqst *, u32 *);
};
/*
* RPC procedure info
*/
typedef int (*svc_procfunc)(struct svc_rqst *, void *argp, void *resp);
struct svc_procedure {
svc_procfunc pc_func; /* process the request */
kxdrproc_t pc_decode; /* XDR decode args */
kxdrproc_t pc_encode; /* XDR encode result */
kxdrproc_t pc_release; /* XDR free result */
unsigned int pc_argsize; /* argument struct size */
unsigned int pc_ressize; /* result struct size */
unsigned int pc_count; /* call count */
unsigned int pc_cachetype; /* cache info (NFS) */
unsigned int pc_xdrressize; /* maximum size of XDR reply */
};
/*
* This is the RPC server thread function prototype
*/
typedef void (*svc_thread_fn)(struct svc_rqst *);
/*
* Function prototypes.
*/
struct svc_serv * svc_create(struct svc_program *, unsigned int);
int svc_create_thread(svc_thread_fn, struct svc_serv *);
void svc_exit_thread(struct svc_rqst *);
void svc_destroy(struct svc_serv *);
int svc_process(struct svc_serv *, struct svc_rqst *);
int svc_register(struct svc_serv *, int, unsigned short);
void svc_wake_up(struct svc_serv *);
void svc_reserve(struct svc_rqst *rqstp, int space);
#endif /* SUNRPC_SVC_H */