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9660srv: do not ignore upper 32 bits of offset when reading directory

--- a/sys/src/cmd/9660srv/9660srv.c

+++ b/sys/src/cmd/9660srv/9660srv.c

@@ -13,7 +13,7 @@

 static void	iwalk(Xfile*, char*);

 static void	iopen(Xfile*, int);

 static void	icreate(Xfile*, char*, long, int);

-static long	ireaddir(Xfile*, uchar*, long, long);

+static long	ireaddir(Xfile*, uchar*, vlong, long);

 static long	iread(Xfile*, char*, vlong, long);

 static long	iwrite(Xfile*, char*, vlong, long);

 static void	iclunk(Xfile*);

@@ -314,7 +314,7 @@

 }

 static long

-ireaddir(Xfile *f, uchar *buf, long offset, long count)

+ireaddir(Xfile *f, uchar *buf, vlong offset, long count)

 {

 	Isofile *ip = f->ptr;

 	Dir d;

--- a/sys/src/cmd/9660srv/dat.h

+++ b/sys/src/cmd/9660srv/dat.h

@@ -54,7 +54,7 @@

 	void	(*walk)(Xfile*, char*);

 	void	(*open)(Xfile*, int);

 	void	(*create)(Xfile*, char*, long, int);

-	long	(*readdir)(Xfile*, uchar*, long, long);

+	long	(*readdir)(Xfile*, uchar*, vlong, long);

 	long	(*read)(Xfile*, char*, vlong, long);

 	long	(*write)(Xfile*, char*, vlong, long);

 	void	(*clunk)(Xfile*);