bcachefs: Add cannibalize lock to btree_cache_to_text()

More debugging info is always a good thing.
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/btree_cache.c

@@ -1073,6 +1073,7 @@ void bch2_btree_node_to_text(struct printbuf *out, struct bch_fs *c,
 
 void bch2_btree_cache_to_text(struct printbuf *out, struct bch_fs *c)
 {
-	pr_buf(out, "nr nodes:\t%u\n", c->btree_cache.used);
-	pr_buf(out, "nr dirty:\t%u\n", atomic_read(&c->btree_cache.dirty));
+	pr_buf(out, "nr nodes:\t\t%u\n", c->btree_cache.used);
+	pr_buf(out, "nr dirty:\t\t%u\n", atomic_read(&c->btree_cache.dirty));
+	pr_buf(out, "cannibalize lock:\t%p\n", c->btree_cache.alloc_lock);
 }