Add component initialization.

components/dfs/filesystems/devfs/devfs.c

@@ -277,4 +277,5 @@ int devfs_init(void)
 
 	return 0;
 }
+INIT_FS_EXPORT(devfs_init);
 

components/dfs/filesystems/elmfat/dfs_elm.c

@@ -783,6 +783,7 @@ int elm_init(void)
 
     return 0;
 }
+INIT_FS_EXPORT(elm_init);
 
 /*
  * RT-Thread Device Interface for ELM FatFs

components/dfs/filesystems/jffs2/dfs_jffs2.c

@@ -726,3 +726,5 @@ int dfs_jffs2_init(void)
 	rt_kprintf("init jffs2 lock mutex okay\n");
 	return 0;
 }
+INIT_FS_EXPORT(dfs_jffs2_init);
+

components/dfs/filesystems/nfs/dfs_nfs.c

@@ -1106,3 +1106,4 @@ int nfs_init(void)
 
 	return RT_EOK;
 }
+INIT_FS_EXPORT(nfs_init);

components/dfs/filesystems/romfs/dfs_romfs.c

@@ -289,4 +289,5 @@ int dfs_romfs_init(void)
     dfs_register(&_romfs);
 	return 0;
 }
+INIT_FS_EXPORT(dfs_romfs_init);
 

components/dfs/filesystems/uffs/dfs_uffs.c

@@ -654,3 +654,4 @@ int dfs_uffs_init(void)
 	}
 	return -RT_ERROR;
 }
+INIT_FS_EXPORT(dfs_uffs_init);

components/dfs/src/dfs.c

@@ -16,7 +16,7 @@
 #include <dfs_fs.h>
 #include <dfs_file.h>
 
-#define NO_WORKING_DIR  "system does not support working dir\n"
+#define NO_WORKING_DIR  "system does not support working directory\n"
 
 /* Global variables */
 const struct dfs_filesystem_operation *filesystem_operation_table[DFS_FILESYSTEM_TYPES_MAX];
@@ -62,6 +62,7 @@ void dfs_init(void)
     working_directory[0] = '/';
 #endif
 }
+INIT_COMPONENT_EXPORT(dfs_init);
 
 /**
  * this function will lock device file system.

components/dfs/src/dfs_posix.c

@@ -757,7 +757,7 @@ char *getcwd(char *buf, size_t size)
     rt_strncpy(buf, working_directory, size);
     rt_exit_critical();
 #else
-    rt_kprintf("WARNING: not support working directory\n");
+    rt_kprintf(NO_WORKING_DIR);
 #endif
 
     return buf;