#include <u.h>#include <libc.h>#include "iotrack.h"#include "dat.h"#include "fns.h" int readonly; static intdeverror(char *name, Xfs *xf, vlong addr, long n, long nret){	errno = Eio;	if(nret < 0){		chat("%s errstr=\"%r\"...", name);		close(xf->dev);		xf->dev = -1;		return -1;	}	fprint(2, "dev %d sector %lld, %s: %ld, should be %ld\n", xf->dev, addr, name, nret, n);	return -1;} intdevread(Xfs *xf, vlong addr, void *buf, long n){	long nread; 	if(xf->dev < 0)		return -1;	nread = pread(xf->dev, buf, n, xf->offset+addr*xf->sectsize);	if (nread == n)		return 0;	return deverror("read", xf, addr, n, nread);} intdevwrite(Xfs *xf, vlong addr, void *buf, long n){	long nwrite; 	if(xf->omode==OREAD)		return -1; 	if(xf->dev < 0)		return -1;	nwrite = pwrite(xf->dev, buf, n, xf->offset+addr*xf->sectsize);	if (nwrite == n)		return 0;	return deverror("write", xf, addr, n, nwrite);}