maple_tree: print store type in mas_dump()

Knowing the store type of the maple state could be helpful for debugging.
Have mas_dump() print mas->store_type.

Link: https://lkml.kernel.org/r/20240814161944.55347-9-sidhartha.kumar@oracle.comSigned-off-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

lib/maple_tree.c

@@ -7760,6 +7760,40 @@ void mas_dump(const struct ma_state *mas)
 		break;
 	}
 
+	pr_err("Store Type: ");
+	switch (mas->store_type) {
+	case wr_invalid:
+		pr_err("invalid store type\n");
+		break;
+	case wr_new_root:
+		pr_err("new_root\n");
+		break;
+	case wr_store_root:
+		pr_err("store_root\n");
+		break;
+	case wr_exact_fit:
+		pr_err("exact_fit\n");
+		break;
+	case wr_split_store:
+		pr_err("split_store\n");
+		break;
+	case wr_slot_store:
+		pr_err("slot_store\n");
+		break;
+	case wr_append:
+		pr_err("append\n");
+		break;
+	case wr_node_store:
+		pr_err("node_store\n");
+		break;
+	case wr_spanning_store:
+		pr_err("spanning_store\n");
+		break;
+	case wr_rebalance:
+		pr_err("rebalance\n");
+		break;
+	}
+
 	pr_err("[%u/%u] index=%lx last=%lx\n", mas->offset, mas->end,
 	       mas->index, mas->last);
 	pr_err("     min=%lx max=%lx alloc=%p, depth=%u, flags=%x\n",