bcachefs: Btree iterator, update flags no longer conflict

Change btree_update_flags to start after the last btree iterator flag,
so that we can pass both in the same flags argument.

This is needed for the upcoming bch2_bkey_get_mut() helper.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/bkey_methods.h

@@ -80,7 +80,7 @@ static inline int bch2_mark_key(struct btree_trans *trans,
 }
 
 enum btree_update_flags {
-	__BTREE_UPDATE_INTERNAL_SNAPSHOT_NODE,
+	__BTREE_UPDATE_INTERNAL_SNAPSHOT_NODE = __BTREE_ITER_FLAGS_END,
 	__BTREE_UPDATE_NOJOURNAL,
 	__BTREE_UPDATE_KEY_CACHE_RECLAIM,
 

fs/bcachefs/btree_types.h

@@ -211,6 +211,7 @@ static const u16 BTREE_ITER_FILTER_SNAPSHOTS	= 1 << 12;
 static const u16 BTREE_ITER_NOPRESERVE		= 1 << 13;
 static const u16 BTREE_ITER_CACHED_NOFILL	= 1 << 14;
 static const u16 BTREE_ITER_KEY_CACHE_FILL	= 1 << 15;
+#define __BTREE_ITER_FLAGS_END			       16
 
 enum btree_path_uptodate {
 	BTREE_ITER_UPTODATE		= 0,