staging/lustre/obdclass: runtime load lustre client when needed

Manually force loading of lustre.ko during client
mounts with request_module for cases where
autoloading doesn't happen.
Signed-off-by: NBob Glossman <bob.glossman@intel.com>
Reviewed-on: http://review.whamcloud.com/10587
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-4800Reviewed-by: NJohn L. Hammond <john.hammond@intel.com>
Reviewed-by: NJames Simmons <uja.ornl@gmail.com>
Reviewed-by: NYang Sheng <yang.sheng@intel.com>
Reviewed-by: NAndreas Dilger <andreas.dilger@intel.com>
Signed-off-by: NOleg Drokin <oleg.drokin@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/obdclass/obd_mount.c

@@ -1216,7 +1216,9 @@ int lustre_fill_super(struct super_block *sb, void *data, int silent)
 
 	if (lmd_is_client(lmd)) {
 		CDEBUG(D_MOUNT, "Mounting client %s\n", lmd->lmd_profile);
-		if (!client_fill_super) {
+		if (client_fill_super == NULL)
+			request_module("lustre");
+		if (client_fill_super == NULL) {
 			LCONSOLE_ERROR_MSG(0x165, "Nothing registered for "
 					   "client mount! Is the 'lustre' "
 					   "module loaded?\n");
@@ -1299,6 +1301,7 @@ struct file_system_type lustre_fs_type = {
 	.fs_flags     = FS_BINARY_MOUNTDATA | FS_REQUIRES_DEV |
 			FS_HAS_FIEMAP | FS_RENAME_DOES_D_MOVE,
 };
+MODULE_ALIAS_FS("lustre");
 
 int lustre_register_fs(void)
 {