io/ompio: adjust the priority of the OMPIO component on lustre

this commit brings over the behavior from the 2.x series to master, mostly with the fork for the 3.x series in mind.
Also, use strncasecmp instead of two strncmps

Signed-off-by: Edgar Gabriel <egabriel@central.uh.edu>

ompi/mca/io/ompio/io_ompio_component.c

@@ -10,7 +10,7 @@
  *                         University of Stuttgart.  All rights reserved.
  * Copyright (c) 2004-2005 The Regents of the University of California.
  *                         All rights reserved.
- * Copyright (c) 2008-2015 University of Houston. All rights reserved.
+ * Copyright (c) 2008-2017 University of Houston. All rights reserved.
  * Copyright (c) 2015      Los Alamos National Security, LLC. All rights
  *                         reserved.
  * Copyright (c) 2015      Research Organization for Information Science
@@ -29,6 +29,7 @@
 #include "opal/threads/mutex.h"
 #include "opal/mca/base/base.h"
 #include "ompi/mca/io/io.h"
+#include "ompi/mca/fs/base/base.h"
 #include "io_ompio.h"
 
 int mca_io_ompio_cycle_buffer_size = OMPIO_DEFAULT_CYCLE_BUF_SIZE;
@@ -257,8 +258,38 @@ file_query(struct ompi_file_t *file,
            int *priority)
 {
     mca_io_ompio_data_t *data;
+    char *tmp;
+    int rank;
+    int is_lustre=0; //false
 
-    *priority = priority_param;
+    tmp = strchr (file->f_filename, ':');
+    rank = ompi_comm_rank ( file->f_comm);
+    if (!tmp) {
+        if ( 0 == rank) {
+            if (LUSTRE == mca_fs_base_get_fstype(file->f_filename)) {
+                is_lustre = 1; //true
+            }
+        }
+        
+        file->f_comm->c_coll->coll_bcast (&is_lustre,
+                                          1,
+                                          MPI_INT,
+                                          0,
+                                          file->f_comm,
+                                          file->f_comm->c_coll->coll_bcast_module);
+    }
+    else {
+        if (!strncasecmp(file->f_filename, "lustre:", 7) ) {
+            is_lustre = 1;
+        }
+    }
+
+    if (is_lustre) {
+        *priority = 1;
+    }
+    else {
+        *priority = priority_param;
+    }
 
     /* Allocate a space for this module to hang private data (e.g.,
        the OMPIO file handle) */