Index: head/share/man/man5/fs.5
===================================================================
--- head/share/man/man5/fs.5
+++ head/share/man/man5/fs.5
@@ -28,7 +28,7 @@
 .\"     @(#)fs.5	8.2 (Berkeley) 4/19/94
 .\" $FreeBSD$
 .\"
-.Dd April 23, 2016
+.Dd January 16, 2017
 .Dt FS 5
 .Os
 .Sh NAME
@@ -388,18 +388,19 @@
 The format of an external attribute is defined by the extattr structure:
 .Bd -literal
 struct extattr {
-	int32_t	ea_length;	    /* length of this attribute */
-	int8_t	ea_namespace;	    /* name space of this attribute */
-	int8_t	ea_contentpadlen;   /* padding at end of attribute */
-	int8_t	ea_namelength;	    /* length of attribute name */
-	char	ea_name[1];	    /* null-terminated attribute name */
+	uint32_t ea_length;	    /* length of this attribute */
+	uint8_t	ea_namespace;	    /* name space of this attribute */
+	uint8_t	ea_contentpadlen;   /* bytes of padding at end of attribute */
+	uint8_t	ea_namelength;	    /* length of attribute name */
+	char	ea_name[1];	    /* attribute name (NOT nul-terminated) */
+	/* padding, if any, to align attribute content to 8 byte boundary */
 	/* extended attribute content follows */
 };
 .Ed
 .Pp
 Several macros are defined to manipulate these structures.
 Each macro takes a pointer to an extattr structure.
-.Bl -tag -width ".Dv EXTATTR_SET_LENGTHS(eap, size)"
+.Bl -tag -width ".Dv EXTATTR_CONTENT_SIZE(eap)"
 .It Dv EXTATTR_NEXT(eap)
 Returns a pointer to the next extended attribute following
 .Fa eap .
@@ -409,35 +410,19 @@
 .It Dv EXTATTR_CONTENT_SIZE(eap)
 Returns the size of the extended attribute content referenced by
 .Fa eap .
-.It Dv EXTATTR_SET_LENGTHS(eap, size)
-Called with the size of the attribute content after initializing
-the attribute name to calculate and set the
-.Fa ea_length ,
-.Fa ea_namelength ,
-and
-.Fa ea_contentpadlen
-fields of the extended attribute structure.
 .El
 .Pp
 The following code identifies an ACL:
 .Bd -literal
 	if (eap->ea_namespace == EXTATTR_NAMESPACE_SYSTEM &&
-	    !strcmp(eap->ea_name, POSIX1E_ACL_ACCESS_EXTATTR_NAME) {
+            eap->ea_namelength == sizeof(POSIX1E_ACL_ACCESS_EXTATTR_NAME) - 1 &&
+	    strncmp(eap->ea_name, POSIX1E_ACL_ACCESS_EXTATTR_NAME,
+             sizeof(POSIX1E_ACL_ACCESS_EXTATTR_NAME) - 1) == 0) {
 		aclp = EXTATTR_CONTENT(eap);
 		acllen = EXTATTR_CONTENT_SIZE(eap);
 		...
 	}
 .Ed
-.Pp
-The following code creates an extended attribute
-containing a copy of a structure
-.Fa mygif :
-.Bd -literal
-	eap->ea_namespace = EXTATTR_NAMESPACE_USER;
-	strcpy(eap->ea_name, "filepic.gif");
-	EXTATTR_SET_LENGTHS(eap, sizeof(struct mygif));
-	memcpy(EXTATTR_CONTENT(eap), &mygif, sizeof(struct mygif));
-.Ed
 .Sh HISTORY
 A super-block structure named filsys appeared in
 .At v6 .
Index: head/sys/ufs/ufs/extattr.h
===================================================================
--- head/sys/ufs/ufs/extattr.h
+++ head/sys/ufs/ufs/extattr.h
@@ -73,11 +73,12 @@
  * This structure defines the required fields of an extended-attribute header.
  */
 struct extattr {
-	int32_t	ea_length;	    /* length of this attribute */
-	int8_t	ea_namespace;	    /* name space of this attribute */
-	int8_t	ea_contentpadlen;   /* bytes of padding at end of attribute */
-	int8_t	ea_namelength;	    /* length of attribute name */
-	char	ea_name[1];	    /* null-terminated attribute name */
+	uint32_t ea_length;	    /* length of this attribute */
+	uint8_t	ea_namespace;	    /* name space of this attribute */
+	uint8_t	ea_contentpadlen;   /* bytes of padding at end of attribute */
+	uint8_t	ea_namelength;	    /* length of attribute name */
+	char	ea_name[1];	    /* attribute name (NOT nul-terminated) */
+	/* padding, if any, to align attribute content to 8 byte boundary */
 	/* extended attribute content follows */
 };
 
@@ -90,9 +91,6 @@
  *	content referenced by eap.
  * EXTATTR_CONTENT_SIZE(eap) returns the size of the extended attribute
  *	content referenced by eap.
- * EXTATTR_SET_LENGTHS(eap, contentsize) called after initializing the
- *	attribute name to calculate and set the ea_length, ea_namelength,
- *	and ea_contentpadlen fields of the extended attribute structure.
  */
 #define	EXTATTR_NEXT(eap) \
 	((struct extattr *)(((void *)(eap)) + (eap)->ea_length))
@@ -101,15 +99,6 @@
 	((eap)->ea_length - EXTATTR_BASE_LENGTH(eap) - (eap)->ea_contentpadlen)
 #define	EXTATTR_BASE_LENGTH(eap) \
 	((sizeof(struct extattr) + (eap)->ea_namelength + 7) & ~7)
-#define	EXTATTR_SET_LENGTHS(eap, contentsize) do { \
-	KASSERT(((eap)->ea_name[0] != 0), \
-		("Must initialize name before setting lengths")); \
-	(eap)->ea_namelength = strlen((eap)->ea_name); \
-	(eap)->ea_contentpadlen = ((contentsize) % 8) ? \
-		8 - ((contentsize) % 8) : 0; \
-	(eap)->ea_length = EXTATTR_BASE_LENGTH(eap) + \
-		(contentsize) + (eap)->ea_contentpadlen; \
-} while (0)
 
 #ifdef _KERNEL
 
@@ -149,13 +138,6 @@
 int	ufs_setextattr(struct vop_setextattr_args *ap);
 void	ufs_extattr_vnode_inactive(struct vnode *vp, struct thread *td);
 
-#else
-
-/* User-level definition of KASSERT for macros above */
-#define	KASSERT(cond, str) do { \
-        if (!(cond)) { printf("panic: "); printf(str); printf("\n"); exit(1); }\
-} while (0)
-
 #endif /* !_KERNEL */
 
 #endif /* !_UFS_UFS_EXTATTR_H_ */