use Access() instead of Lstat() for frequent use (#11911)

using Lstat() is causing tiny memory allocations,
that are usually wasted and never used, instead
we can simply uses Access() call that does 0
memory allocations.

cmd/os-instrumented.go

@@ -39,6 +39,7 @@ const (
 	osMetricLstat
 	osMetricRemove
 	osMetricStat
+	osMetricAccess
 	// .... add more
 
 	osMetricLast
@@ -94,6 +95,14 @@ func OpenFile(name string, flag int, perm os.FileMode) (*os.File, error) {
 	return os.OpenFile(name, flag, perm)
 }
 
+// Access captures time taken to call syscall.Access()
+// on windows, plan9 and solaris syscall.Access uses
+// os.Lstat()
+func Access(name string) error {
+	defer updateOSMetrics(osMetricAccess, name)()
+	return access(name)
+}
+
 // Open captures time taken to call os.Open
 func Open(name string) (*os.File, error) {
 	defer updateOSMetrics(osMetricOpen, name)()