/* Copyright (C) 2003 Russ Cox, Massachusetts Institute of Technology *//* See COPYRIGHT */ #include <u.h>#include <libc.h>#include <fcall.h>#include <9pclient.h>#include "fsimpl.h" longfspread(CFid *fid, void *buf, long n, vlong offset){	Fcall tx, rx;	void *freep;	uint msize; 	msize = fid->fs->msize - IOHDRSZ;	if(n > msize)		n = msize;	tx.type = Tread;	tx.fid = fid->fid;	if(offset == -1){		qlock(&fid->lk);		tx.offset = fid->offset;		qunlock(&fid->lk);	}else		tx.offset = offset;	tx.count = n; 	if(_fsrpc(fid->fs, &tx, &rx, &freep) < 0)		return -1;	if(rx.type == Rerror){		werrstr("%s", rx.ename);		free(freep);		return -1;	}	if(rx.count){		memmove(buf, rx.data, rx.count);		if(offset == -1){			qlock(&fid->lk);			fid->offset += rx.count;			qunlock(&fid->lk);		}	}	free(freep);		return rx.count;} longfsread(CFid *fid, void *buf, long n){	return fspread(fid, buf, n, -1);} longfsreadn(CFid *fid, void *buf, long n){	long tot, nn; 	for(tot=0; tot<n; tot+=nn){		nn = fsread(fid, (char*)buf+tot, n-tot);		if(nn <= 0){			if(tot == 0)				return nn;			break;		}	}	return tot;}