bcachefs: move check_pos_snapshot_overwritten() to snapshot.c

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/btree_update.c

@@ -28,51 +28,6 @@ bch2_trans_update_by_path(struct btree_trans *, struct btree_path *,
 			  struct bkey_i *, enum btree_update_flags,
 			  unsigned long ip);
 
-static noinline int __check_pos_snapshot_overwritten(struct btree_trans *trans,
-					  enum btree_id id,
-					  struct bpos pos)
-{
-	struct bch_fs *c = trans->c;
-	struct btree_iter iter;
-	struct bkey_s_c k;
-	int ret;
-
-	bch2_trans_iter_init(trans, &iter, id, pos,
-			     BTREE_ITER_NOT_EXTENTS|
-			     BTREE_ITER_ALL_SNAPSHOTS);
-	while (1) {
-		k = bch2_btree_iter_prev(&iter);
-		ret = bkey_err(k);
-		if (ret)
-			break;
-
-		if (!k.k)
-			break;
-
-		if (!bkey_eq(pos, k.k->p))
-			break;
-
-		if (bch2_snapshot_is_ancestor(c, k.k->p.snapshot, pos.snapshot)) {
-			ret = 1;
-			break;
-		}
-	}
-	bch2_trans_iter_exit(trans, &iter);
-
-	return ret;
-}
-
-static inline int check_pos_snapshot_overwritten(struct btree_trans *trans,
-					  enum btree_id id,
-					  struct bpos pos)
-{
-	if (!btree_type_has_snapshots(id) ||
-	    bch2_snapshot_is_leaf(trans->c, pos.snapshot))
-		return 0;
-
-	return __check_pos_snapshot_overwritten(trans, id, pos);
-}
-
 static noinline int extent_front_merge(struct btree_trans *trans,
 				       struct btree_iter *iter,
 				       struct bkey_s_c k,
@@ -91,8 +46,8 @@ static noinline int extent_front_merge(struct btree_trans *trans,
 	if (!bch2_bkey_merge(c, bkey_i_to_s(update), bkey_i_to_s_c(*insert)))
 		return 0;
 
-	ret =   check_pos_snapshot_overwritten(trans, iter->btree_id, k.k->p) ?:
-		check_pos_snapshot_overwritten(trans, iter->btree_id, (*insert)->k.p);
+	ret =   bch2_key_has_snapshot_overwrites(trans, iter->btree_id, k.k->p) ?:
+		bch2_key_has_snapshot_overwrites(trans, iter->btree_id, (*insert)->k.p);
 	if (ret < 0)
 		return ret;
 	if (ret)
@@ -114,8 +69,8 @@ static noinline int extent_back_merge(struct btree_trans *trans,
 	struct bch_fs *c = trans->c;
 	int ret;
 
-	ret =   check_pos_snapshot_overwritten(trans, iter->btree_id, insert->k.p) ?:
-		check_pos_snapshot_overwritten(trans, iter->btree_id, k.k->p);
+	ret =   bch2_key_has_snapshot_overwrites(trans, iter->btree_id, insert->k.p) ?:
+		bch2_key_has_snapshot_overwrites(trans, iter->btree_id, k.k->p);
 	if (ret < 0)
 		return ret;
 	if (ret)

fs/bcachefs/snapshot.c

@@ -1336,6 +1336,40 @@ int bch2_delete_dead_snapshots_hook(struct btree_trans *trans,
 	return 0;
 }
 
+int __bch2_key_has_snapshot_overwrites(struct btree_trans *trans,
+				       enum btree_id id,
+				       struct bpos pos)
+{
+	struct bch_fs *c = trans->c;
+	struct btree_iter iter;
+	struct bkey_s_c k;
+	int ret;
+
+	bch2_trans_iter_init(trans, &iter, id, pos,
+			     BTREE_ITER_NOT_EXTENTS|
+			     BTREE_ITER_ALL_SNAPSHOTS);
+	while (1) {
+		k = bch2_btree_iter_prev(&iter);
+		ret = bkey_err(k);
+		if (ret)
+			break;
+
+		if (!k.k)
+			break;
+
+		if (!bkey_eq(pos, k.k->p))
+			break;
+
+		if (bch2_snapshot_is_ancestor(c, k.k->p.snapshot, pos.snapshot)) {
+			ret = 1;
+			break;
+		}
+	}
+	bch2_trans_iter_exit(trans, &iter);
+
+	return ret;
+}
+
 int bch2_snapshots_read(struct bch_fs *c)
 {
 	struct btree_iter iter;

fs/bcachefs/snapshot.h

@@ -250,6 +250,19 @@ int bch2_delete_dead_snapshots_hook(struct btree_trans *,
 				    struct btree_trans_commit_hook *);
 void bch2_delete_dead_snapshots_work(struct work_struct *);
 
+int __bch2_key_has_snapshot_overwrites(struct btree_trans *, enum btree_id, struct bpos);
+
+static inline int bch2_key_has_snapshot_overwrites(struct btree_trans *trans,
+					  enum btree_id id,
+					  struct bpos pos)
+{
+	if (!btree_type_has_snapshots(id) ||
+	    bch2_snapshot_is_leaf(trans->c, pos.snapshot))
+		return 0;
+
+	return __bch2_key_has_snapshot_overwrites(trans, id, pos);
+}
+
 int bch2_snapshots_read(struct bch_fs *);
 void bch2_fs_snapshots_exit(struct bch_fs *);