From 98b45999868dc14eb00a9271035a128435c56910 Mon Sep 17 00:00:00 2001
From: Thomas Schoebel-Theuer <tst@1und1.de>
Date: Mon, 12 Jul 2021 11:46:06 +0200
Subject: [PATCH] mapfree: compute dirty regions when unshared

---
 kernel/lib_mapfree.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/kernel/lib_mapfree.c b/kernel/lib_mapfree.c
index 13ed1a89..2b4c78d7 100644
--- a/kernel/lib_mapfree.c
+++ b/kernel/lib_mapfree.c
@@ -478,8 +478,10 @@ loff_t mf_get_any_dirty(const char *filename, int stage)
 	     tmp = tmp->next) {
 		struct mapfree_info *mf = container_of(tmp, struct mapfree_info, mf_head);
 		if (!strcmp(mf->mf_name, filename)) {
-			res = mf_dirty_length(mf, stage);
-			break;
+			loff_t len = mf_dirty_length(mf, stage);
+
+			if (len > res)
+				res = len;
 		}
 	}
 	up_read(&mf_table[hash].hash_mutex);