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cwfs: use pragma pack for on disk structures for amd64

--- a/sys/src/cmd/cwfs/portdat.h

+++ b/sys/src/cmd/cwfs/portdat.h

@@ -77,6 +77,9 @@

 typedef	struct	Uid	Uid;

 typedef	struct	Wpath	Wpath;

+#pragma pack on

+

+/* DONT TOUCH, this is the disk structure */

 struct	Tag

 {

 	short	pad;		/* make tag end at a long boundary */

@@ -139,6 +142,8 @@

 	long	mtime;

 };

+#pragma pack off

+

 /*

  * derived constants

  */

@@ -399,6 +404,8 @@

 	char	name[NAMELEN];	/* user name */

 };

+#pragma pack on

+

 /* DONT TOUCH, this is the disk structure */

 struct	Fbuf

 {

@@ -413,6 +420,8 @@

 	Super1;

 };

+#pragma pack off

+

 struct	Conf

 {

 	ulong	nmach;		/* processors */

@@ -530,6 +539,7 @@

 /*

  * cw device

  */

+#pragma pack on

 /* DONT TOUCH, this is the disk structure */

 struct	Cache

@@ -568,6 +578,8 @@

 	ushort	ord;		/* side number within Juke */

 	char	service[64];	/* documentation only */

 };

+

+#pragma pack off

 typedef struct Map Map;

 struct Map {

-- 

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