fix: resolve RwLock across await bug

Author: wa5i

src/mount.rs

@@ -355,18 +355,20 @@ impl MountTable {
         hmac_level: MountEntryHMACLevel,
     ) -> Result<(), RvError> {
         let mut need_persist = false;
-        let mounts = self.entries.read()?;
+        {
+            let mounts = self.entries.read()?;
 
-        for mount_entry in mounts.values() {
-            let mut entry = mount_entry.write()?;
-            if entry.table.is_empty() {
-                entry.table = MOUNT_TABLE_TYPE.to_string();
-                need_persist = true;
-            }
+            for mount_entry in mounts.values() {
+                let mut entry = mount_entry.write()?;
+                if entry.table.is_empty() {
+                    entry.table = MOUNT_TABLE_TYPE.to_string();
+                    need_persist = true;
+                }
 
-            if entry.hmac.is_empty() && hmac_key.is_some() && hmac_level == MountEntryHMACLevel::Compat {
-                entry.calc_hmac(hmac_key.unwrap())?;
-                need_persist = true;
+                if entry.hmac.is_empty() && hmac_key.is_some() && hmac_level == MountEntryHMACLevel::Compat {
+                    entry.calc_hmac(hmac_key.unwrap())?;
+                    need_persist = true;
+                }
             }
         }