Optimize listing with leaf check offloaded to posix (#7541)

Other listing optimizations include

- remove double sorting while filtering object entries
- improve error message when upload-id is not in quorum
- use jsoniter for full unmarshal json, instead of gjson
- remove unused code

cmd/object-api-errors.go

@@ -27,6 +27,22 @@ import (
 // underlying storage layer.
 func toObjectErr(err error, params ...string) error {
 	switch err {
+	case errDiskNotFound:
+		switch len(params) {
+		case 1:
+			err = BucketNotFound{Bucket: params[0]}
+		case 2:
+			err = ObjectNotFound{
+				Bucket: params[0],
+				Object: params[1],
+			}
+		case 3:
+			err = InvalidUploadID{
+				Bucket:   params[0],
+				Object:   params[1],
+				UploadID: params[2],
+			}
+		}
 	case errVolumeNotFound:
 		if len(params) >= 1 {
 			err = BucketNotFound{Bucket: params[0]}
@@ -63,11 +79,18 @@ func toObjectErr(err error, params ...string) error {
 			}
 		}
 	case errFileNotFound:
-		if len(params) >= 2 {
+		switch len(params) {
+		case 2:
 			err = ObjectNotFound{
 				Bucket: params[0],
 				Object: params[1],
 			}
+		case 3:
+			err = InvalidUploadID{
+				Bucket:   params[0],
+				Object:   params[1],
+				UploadID: params[2],
+			}
 		}
 	case errFileNameTooLong:
 		if len(params) >= 2 {
@@ -321,6 +344,8 @@ func (e MalformedUploadID) Error() string {
 
 // InvalidUploadID invalid upload id.
 type InvalidUploadID struct {
+	Bucket   string
+	Object   string
 	UploadID string
 }