UBIFS: use correct flags in lprops

The UBIFS lpt tree is in many aspects similar to the TNC tree, and we have
similar flags for these trees. And by mistake we use the COW_ZNODE flag for
LPT in some places, instead of the right flag COW_CNODE. And this works
only because these two constants have the same value.

This patch makes all the LPT code to use COW_CNODE and also changes COW_CNODE
constant value to make sure we do not misuse the flags any more.
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

fs/ubifs/lprops.c

@@ -504,7 +504,7 @@ static int is_lprops_dirty(struct ubifs_info *c, struct ubifs_lprops *lprops)
 	pnode = (struct ubifs_pnode *)container_of(lprops - pos,
 						   struct ubifs_pnode,
 						   lprops[0]);
-	return !test_bit(COW_ZNODE, &pnode->flags) &&
+	return !test_bit(COW_CNODE, &pnode->flags) &&
 	       test_bit(DIRTY_CNODE, &pnode->flags);
 }
 

fs/ubifs/lpt_commit.c

@@ -116,8 +116,8 @@ static int get_cnodes_to_commit(struct ubifs_info *c)
 		return 0;
 	cnt += 1;
 	while (1) {
-		ubifs_assert(!test_bit(COW_ZNODE, &cnode->flags));
-		__set_bit(COW_ZNODE, &cnode->flags);
+		ubifs_assert(!test_bit(COW_CNODE, &cnode->flags));
+		__set_bit(COW_CNODE, &cnode->flags);
 		cnext = next_dirty_cnode(cnode);
 		if (!cnext) {
 			cnode->cnext = c->lpt_cnext;
@@ -465,7 +465,7 @@ static int write_cnodes(struct ubifs_info *c)
 		 */
 		clear_bit(DIRTY_CNODE, &cnode->flags);
 		smp_mb__before_clear_bit();
-		clear_bit(COW_ZNODE, &cnode->flags);
+		clear_bit(COW_CNODE, &cnode->flags);
 		smp_mb__after_clear_bit();
 		offs += len;
 		dbg_chk_lpt_sz(c, 1, len);

fs/ubifs/ubifs.h

@@ -230,14 +230,14 @@ enum {
  * LPT cnode flag bits.
  *
  * DIRTY_CNODE: cnode is dirty
- * COW_CNODE: cnode is being committed and must be copied before writing
  * OBSOLETE_CNODE: cnode is being committed and has been copied (or deleted),
- * so it can (and must) be freed when the commit is finished
+ *                 so it can (and must) be freed when the commit is finished
+ * COW_CNODE: cnode is being committed and must be copied before writing
  */
 enum {
 	DIRTY_CNODE    = 0,
-	COW_CNODE      = 1,
-	OBSOLETE_CNODE = 2,
+	OBSOLETE_CNODE = 1,
+	COW_CNODE      = 2,
 };
 
 /*