[RFC PATCH v5 3/3] ext4: do not allow mount with test_dummy_encryption if encrypt not set

[Sheng Yong <shengyong1@huawei.com>]

When mounting with test_dummy_encryption option, if encrypt feature
is not set, return fail instead of setting encrypt feature forcely.

Cc: linux-ext4@vger.kernel.org
Signed-off-by: Sheng Yong <shengyong1@huawei.com>
---
 fs/ext4/super.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 39bf464c35f1..1a253342b09e 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -4149,10 +4149,9 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 		goto failed_mount_wq;
 	}
 
-	if (DUMMY_ENCRYPTION_ENABLED(sbi) && !sb_rdonly(sb) &&
-	    !ext4_has_feature_encrypt(sb)) {
-		ext4_set_feature_encrypt(sb);
-		ext4_commit_super(sb, 1);
+	if (DUMMY_ENCRYPTION_ENABLED(sbi) && !ext4_has_feature_encrypt(sb)) {
+		ext4_msg(sb, KERN_ERR, "Encrypt does not support");
+		goto failed_mount_wq;
 	}
 
 	/*
-- 
2.16.2


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