[JFFS2][XATTR] rid unnecessary writing of delete marker.

In the followinf situation, an explicit delete marker is not
necessary, because we can certainlly detect those obsolete
xattr_datum or xattr_ref on next mounting.

- When to delete xattr_datum node.
- When to delete xattr_ref node on removing inode.
- When to delete xattr_ref node on updating xattr.

This patch rids writing delete marker in those situations.
Signed-off-by: KaiGai Kohei <kaigai@ak.jp.nec.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

fs/jffs2/scan.c

@@ -332,10 +332,8 @@ static int jffs2_scan_xattr_node(struct jffs2_sb_info *c, struct jffs2_erasebloc
 	xid = je32_to_cpu(rx->xid);
 	version = je32_to_cpu(rx->version);
 
-	totlen = sizeof(struct jffs2_raw_xattr);
-	if (version != XDATUM_DELETE_MARKER)
-		totlen += rx->name_len + 1 + je16_to_cpu(rx->value_len);
-	totlen = PAD(totlen);
+	totlen = PAD(sizeof(struct jffs2_raw_xattr)
+			+ rx->name_len + 1 + je16_to_cpu(rx->value_len));
 	if (totlen != je32_to_cpu(rx->totlen)) {
 		JFFS2_WARNING("node length mismatch at %#08x, read=%u, calc=%u\n",
 			      ofs, je32_to_cpu(rx->totlen), totlen);

fs/jffs2/xattr.h

@@ -16,6 +16,7 @@
 
 #define JFFS2_XFLAGS_HOT	(0x01)	/* This datum is HOT */
 #define JFFS2_XFLAGS_BIND	(0x02)	/* This datum is not reclaimed */
+#define JFFS2_XFLAGS_DEAD	(0x40)	/* This datum is already dead */
 #define JFFS2_XFLAGS_INVALID	(0x80)	/* This datum contains crc error */
 
 struct jffs2_xattr_datum
@@ -60,34 +61,12 @@ struct jffs2_xattr_ref
 	struct jffs2_xattr_ref *next;		/* chained from ic->xref_list */
 };
 
-#define XDATUM_DELETE_MARKER	(0xffffffff)
 #define XREF_DELETE_MARKER	(0x00000001)
-static inline int is_xattr_datum_dead(struct jffs2_xattr_datum *xd)
-{
-	return (xd->version == XDATUM_DELETE_MARKER);
-}
-
-static inline void set_xattr_datum_dead(struct jffs2_xattr_datum *xd)
-{
-	xd->version = XDATUM_DELETE_MARKER;
-}
-
 static inline int is_xattr_ref_dead(struct jffs2_xattr_ref *ref)
 {
 	return ((ref->xseqno & XREF_DELETE_MARKER) != 0);
 }
 
-static inline void set_xattr_ref_dead(struct jffs2_xattr_ref *ref)
-{
-	ref->xseqno |= XREF_DELETE_MARKER;
-}
-
-static inline void clr_xattr_ref_dead(struct jffs2_xattr_ref *ref)
-{
-	ref->xseqno &= ~XREF_DELETE_MARKER;
-}
-
-
 #ifdef CONFIG_JFFS2_FS_XATTR
 
 extern void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c);