fix: save ModTime properly in disk cache (#11522)

fix #11414

cmd/disk-cache-backend.go

@@ -103,7 +103,6 @@ func (m *cacheMeta) ToObjectInfo(bucket, object string) (o ObjectInfo) {
 	}
 
 	// We set file info only if its valid.
-	o.ModTime = m.Stat.ModTime
 	o.Size = m.Stat.Size
 	o.ETag = extractETag(m.Meta)
 	o.ContentType = m.Meta["content-type"]
@@ -122,6 +121,12 @@ func (m *cacheMeta) ToObjectInfo(bucket, object string) (o ObjectInfo) {
 			o.Expires = t.UTC()
 		}
 	}
+	if mtime, ok := m.Meta["last-modified"]; ok {
+		if t, e = time.Parse(http.TimeFormat, mtime); e == nil {
+			o.ModTime = t.UTC()
+		}
+	}
+
 	// etag/md5Sum has already been extracted. We need to
 	// remove to avoid it from appearing as part of user-defined metadata
 	o.UserDefined = cleanMetadata(m.Meta)
@@ -506,9 +511,7 @@ func (c *diskCache) statCache(ctx context.Context, cacheObjPath string) (meta *c
 	}
 	// get metadata of part.1 if full file has been cached.
 	partial = true
-	fi, err := os.Stat(pathJoin(cacheObjPath, cacheDataFile))
+	if _, err := os.Stat(pathJoin(cacheObjPath, cacheDataFile)); err == nil {
-	if err == nil {
-		meta.Stat.ModTime = atime.Get(fi)
 		partial = false
 	}
 	return meta, partial, meta.Hits, nil
@@ -570,7 +573,6 @@ func (c *diskCache) saveMetadata(ctx context.Context, bucket, object string, met
 		}
 	}
 	m.Stat.Size = actualSize
-	m.Stat.ModTime = UTCNow()
 	if !incHitsOnly {
 		// reset meta
 		m.Meta = meta

cmd/disk-cache.go

@@ -200,6 +200,7 @@ func getMetadata(objInfo ObjectInfo) map[string]string {
 	if !objInfo.Expires.Equal(timeSentinel) {
 		metadata["expires"] = objInfo.Expires.Format(http.TimeFormat)
 	}
+	metadata["last-modified"] = objInfo.ModTime.Format(http.TimeFormat)
 	for k, v := range objInfo.UserDefined {
 		metadata[k] = v
 	}

cmd/disk-cache_test.go

@@ -18,6 +18,7 @@ package cmd
 
 import (
 	"testing"
+	"time"
 )
 
 // Tests ToObjectInfo function.
@@ -27,7 +28,7 @@ func TestCacheMetadataObjInfo(t *testing.T) {
 	if objInfo.Size != 0 {
 		t.Fatal("Unexpected object info value for Size", objInfo.Size)
 	}
-	if !objInfo.ModTime.Equal(timeSentinel) {
+	if !objInfo.ModTime.Equal(time.Time{}) {
 		t.Fatal("Unexpected object info value for ModTime ", objInfo.ModTime)
 	}
 	if objInfo.IsDir {

cmd/object-api-utils.go

@@ -258,7 +258,7 @@ func cleanMetadata(metadata map[string]string) map[string]string {
 	// Remove STANDARD StorageClass
 	metadata = removeStandardStorageClass(metadata)
 	// Clean meta etag keys 'md5Sum', 'etag', "expires", "x-amz-tagging".
-	return cleanMetadataKeys(metadata, "md5Sum", "etag", "expires", xhttp.AmzObjectTagging)
+	return cleanMetadataKeys(metadata, "md5Sum", "etag", "expires", xhttp.AmzObjectTagging, "last-modified")
 }
 
 // Filter X-Amz-Storage-Class field only if it is set to STANDARD.