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/*
* 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>
/*
* 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 16384u
/*
* Buffer to store RPC requests or replies in.
* Each server thread has one of these beasts.
*
* Area points to the allocated memory chunk currently owned by the
* buffer. Base points to the buffer containing the request, which is
* different from area when directly reading from an sk_buff. buf is
* the current read/write position while processing an RPC request.
*
* The array of iovecs can hold additional data that the server process
* may not want to copy into the RPC reply buffer, but pass to the
* network sendmsg routines directly. The prime candidate for this
* will of course be NFS READ operations, but one might also want to
* do something about READLINK and READDIR. It might be worthwhile
* to implement some generic readdir cache in the VFS layer...
*
* On the receiving end of the RPC server, the iovec may be used to hold
* the list of IP fragments once we get to process fragmented UDP
* datagrams directly.
*/
#define RPCSVC_MAXIOV ((RPCSVC_MAXPAYLOAD+PAGE_SIZE-1)/PAGE_SIZE + 1)
struct svc_buf {
u32 * area; /* allocated memory */
u32 * base; /* base of RPC datagram */
int buflen; /* total length of buffer */
u32 * buf; /* read/write pointer */
int len; /* current end of buffer */
/* iovec for zero-copy NFS READs */
struct iovec iov[RPCSVC_MAXIOV];
int nriov;
};
#define svc_getlong(argp, val) { (val) = *(argp)->buf++; (argp)->len--; }
#define svc_putlong(resp, val) { *(resp)->buf++ = (val); (resp)->len++; }
/*
* 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) */
};
#endif /* SUNRPC_SVC_H */
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