remove the MCA parameter setting the number of hosts in PLFS, since the plfs_setxattr function used is causing linking problems with PLFS 2.5

remove unused variables.

ompi/mca/fs/plfs/fs_plfs.h

@@ -30,7 +30,6 @@
 #include <plfs.h>
 
 extern int mca_fs_plfs_priority;
-extern int mca_fs_plfs_num_hostdir;
 
 BEGIN_C_DECLS
 

ompi/mca/fs/plfs/fs_plfs_component.c

@@ -39,7 +39,6 @@ const char *mca_fs_plfs_component_version_string =
 static int plfs_register(void);
 
 int mca_fs_plfs_priority = 20;
-int mca_fs_plfs_num_hostdir = -1;
 
 /*
  * Instantiate the public struct with all of our public information
@@ -77,12 +76,6 @@ plfs_register(void)
                                            MCA_BASE_VAR_TYPE_INT, NULL, 0, 0,
                                            OPAL_INFO_LVL_9,
                                            MCA_BASE_VAR_SCOPE_READONLY, &mca_fs_plfs_priority);
-    mca_fs_plfs_num_hostdir = -1;
-    (void) mca_base_component_var_register(&mca_fs_plfs_component.fsm_version,
-                                           "num_hostdir", "number of host directories of a file over plfs",
-                                           MCA_BASE_VAR_TYPE_INT, NULL, 0, 0,
-                                           OPAL_INFO_LVL_9,
-                                           MCA_BASE_VAR_SCOPE_READONLY, &mca_fs_plfs_num_hostdir);
 
     return OMPI_SUCCESS;
 }

ompi/mca/fs/plfs/fs_plfs_file_open.c

@@ -53,8 +53,6 @@ mca_fs_plfs_file_open (struct ompi_communicator_t *comm,
     plfs_error_t plfs_ret;
     Plfs_fd *pfd = NULL;
     char wpath[1024];
-    size_t len = sizeof(int);
-    char key[] = "num_hostdirs";
 
     rank = ompi_comm_rank ( comm );
 
@@ -109,12 +107,5 @@ mca_fs_plfs_file_open (struct ompi_communicator_t *comm,
 	}
     }
 
-    if (mca_fs_plfs_num_hostdir > 0) {
-        plfs_ret = plfs_setxattr( pfd, &mca_fs_plfs_num_hostdir, key, len );
-        if (PLFS_SUCCESS != plfs_ret) {
-	    opal_output(0, "fs_plfs_file_open: Error in plfs_setxattr:\n%s\n", strplfserr(plfs_ret));
-	    return OMPI_ERROR;
-	}
-    }
     return OMPI_SUCCESS;
 }