#include "lib9.h"#include "logfs.h"#include "local.h"#include "fcall.h" typedef struct WalkState {	u32int *flashaddrp;	u32int *lengthp;	int i;	int nth;} WalkState; static intwalk(void *magic, Extent *e, int hole){	WalkState *s = magic;	USED(hole);	if(s->i == s->nth) {		*s->flashaddrp = e->flashaddr;		*s->lengthp = e->max - e->min;		return 0;	}	s->i++;	return 1;} char *logfsserverreadpathextent(LogfsServer *server, u32int path, int nth, u32int *flashaddrp, u32int *lengthp,	long *blockp, int *pagep, int *offsetp){	Entry *e;	WalkState s;	long index;	e = logfspathmapfinde(server->pathmap, path);	if(e == nil)		return logfseunknownpath;	if(e->perm & DMDIR)		return Eisdir;	s.flashaddrp = flashaddrp;	s.lengthp = lengthp;	s.i = 0;	s.nth = nth;	*lengthp = 0;	logfsextentlistwalk(e->u.file.extent, walk, &s);	if(*lengthp) {		logfsflashaddr2spo(server, *flashaddrp, &index, pagep, offsetp);		if(*flashaddrp & LogAddr)			if(index >= server->activelog->unsweptblockindex)				if(index <= server->activelog->curblockindex)					*blockp = server->activelog->blockmap[index];				else					*blockp = -1;			else if(server->sweptlog)				if(index <= server->sweptlog->curblockindex)					*blockp = server->sweptlog->blockmap[index];				else					*blockp = -1;			else				*blockp = -1;		else if(index < server->ndatablocks)			*blockp = server->datablock[index].block;		else			*blockp = -1;	}	else {		*blockp = 0;		*pagep = 0;		*offsetp = 0;	}	return nil;}