Add support of fallocate for FS and XL backends (#3032)

cmd/posix-errors.go

@@ -22,6 +22,26 @@ import (
 	"syscall"
 )
 
+// Function not implemented error
+func isSysErrNoSys(err error) bool {
+	return err != nil && err == syscall.ENOSYS
+}
+
+// Not supported error
+func isSysErrOpNotSupported(err error) bool {
+	return err != nil && err == syscall.EOPNOTSUPP
+}
+
+// No space left on device error
+func isSysErrNoSpace(err error) bool {
+	return err != nil && err == syscall.ENOSPC
+}
+
+// Input/output error
+func isSysErrIO(err error) bool {
+	return err != nil && err == syscall.EIO
+}
+
 // Check if the given error corresponds to ENOTDIR (is not a directory)
 func isSysErrNotDir(err error) bool {
 	if pathErr, ok := err.(*os.PathError); ok {