devex: disable logs for missing fsentries and cache

Often fsentry stats are used to see if an fsentry exists, so fsentry not
found logs are common and expected. This commit disables those by
default. Additionally, logging for cache events is disabled as well,
since those are only helpful when debugging cache specifically.

src/backend/src/modules/puterfs/lib/PuterFSProvider.js

@@ -47,6 +47,13 @@ class PuterFSProvider extends putility.AdvancedBase {
         _path: require('path'),
         uuidv4: require('uuid').v4,
         config: require('../../../config.js'),
+    };
+
+    constructor (...a) {
+        super(...a);
+
+        this.log_fsentriesNotFound = (this.modules.config.logging ?? [])
+            .includes('fsentries-not-found');
     }
 
     get_capabilities () {
@@ -185,7 +192,9 @@ class PuterFSProvider extends putility.AdvancedBase {
         }
 
         if ( ! entry ) {
-            controls.log.warn(`entry not found: ${selector.describe(true)}`);
+            if ( this.log_fsentriesNotFound ) {
+                controls.log.warn(`entry not found: ${selector.describe(true)}`);
+            }
         }
 
         if ( entry === null || typeof entry !== 'object' ) {

src/backend/src/services/file-cache/FileCacheService.js

@@ -53,7 +53,7 @@ class FileCacheService extends AdvancedBase {
         path_: require('path'),
     }
 
-    constructor ({ services, my_config }) {
+    constructor ({ services, my_config, config: global_config }) {
         super({ services });
 
         this.log = services.get('log-service').create(this.constructor.name);
@@ -74,6 +74,9 @@ class FileCacheService extends AdvancedBase {
             initial: 0.5,
             alpha: 0.2,
         });
+        
+        this.logging_enabled = (global_config.logging ?? [])
+            .includes('file-cache');
 
         this.init();