diff --git a/components/dfs/filesystems/elmfat/dfs_elm.c b/components/dfs/filesystems/elmfat/dfs_elm.c
index eb613fe6e6e982ecb67c95765ea19c0615a857a9..72807faae7149a6158079f7e1f5a777e621d1b71 100644
--- a/components/dfs/filesystems/elmfat/dfs_elm.c
+++ b/components/dfs/filesystems/elmfat/dfs_elm.c
@@ -820,7 +820,7 @@ int elm_init(void)
 
     return 0;
 }
-INIT_FS_EXPORT(elm_init);
+INIT_COMPONENT_EXPORT(elm_init);
 
 /*
  * RT-Thread Device Interface for ELM FatFs
diff --git a/components/dfs/filesystems/jffs2/dfs_jffs2.c b/components/dfs/filesystems/jffs2/dfs_jffs2.c
index 78c7730136dd285565bf37cf5f8472ec14769d90..f2ffe471ed67a081d414928d5590e40a688498d9 100644
--- a/components/dfs/filesystems/jffs2/dfs_jffs2.c
+++ b/components/dfs/filesystems/jffs2/dfs_jffs2.c
@@ -726,5 +726,5 @@ int dfs_jffs2_init(void)
 	rt_kprintf("init jffs2 lock mutex okay\n");
 	return 0;
 }
-INIT_FS_EXPORT(dfs_jffs2_init);
+INIT_COMPONENT_EXPORT(dfs_jffs2_init);
 
diff --git a/components/dfs/filesystems/nfs/dfs_nfs.c b/components/dfs/filesystems/nfs/dfs_nfs.c
index 9e0eeda12716fbdce323d5aaca25039b0213f97b..5d7aa0db61008a3b8daa5014107897fe14763c7d 100644
--- a/components/dfs/filesystems/nfs/dfs_nfs.c
+++ b/components/dfs/filesystems/nfs/dfs_nfs.c
@@ -1159,4 +1159,5 @@ int nfs_init(void)
 
     return RT_EOK;
 }
-INIT_FS_EXPORT(nfs_init);
+INIT_COMPONENT_EXPORT(nfs_init);
+
diff --git a/components/dfs/filesystems/ramfs/dfs_ramfs.c b/components/dfs/filesystems/ramfs/dfs_ramfs.c
index e877e921d25ba67004c87d1661789e77b7ec251b..4399e90b8591b2fb92750f420d7cbdfd62dd2a60 100644
--- a/components/dfs/filesystems/ramfs/dfs_ramfs.c
+++ b/components/dfs/filesystems/ramfs/dfs_ramfs.c
@@ -427,7 +427,7 @@ int dfs_ramfs_init(void)
 
     return 0;
 }
-INIT_FS_EXPORT(dfs_ramfs_init);
+INIT_COMPONENT_EXPORT(dfs_ramfs_init);
 
 struct dfs_ramfs* dfs_ramfs_create(rt_uint8_t *pool, rt_size_t size)
 {
diff --git a/components/dfs/filesystems/romfs/dfs_romfs.c b/components/dfs/filesystems/romfs/dfs_romfs.c
index e543899ad1c17aeeabc5b4ef356b310bc1d48b28..f88845f41d828dc81692ba484ebe6ca8d71989a3 100644
--- a/components/dfs/filesystems/romfs/dfs_romfs.c
+++ b/components/dfs/filesystems/romfs/dfs_romfs.c
@@ -330,5 +330,5 @@ int dfs_romfs_init(void)
     dfs_register(&_romfs);
     return 0;
 }
-INIT_FS_EXPORT(dfs_romfs_init);
+INIT_COMPONENT_EXPORT(dfs_romfs_init);
 
diff --git a/components/dfs/filesystems/skeleton/skeleton.c b/components/dfs/filesystems/skeleton/skeleton.c
index 6abcec12fffb85a3bc478df5b47d1f4e97a84cbb..0d96cbffc981240a67647a0e7206ccadfd40ab2f 100644
--- a/components/dfs/filesystems/skeleton/skeleton.c
+++ b/components/dfs/filesystems/skeleton/skeleton.c
@@ -24,22 +24,23 @@
 #include <rtthread.h>
 #include <dfs.h>
 #include <dfs_fs.h>
+#include <dfs_file.h>
 
 #include "dfs_skt_fs.h"
 
 int dfs_skt_mount(struct dfs_filesystem* fs, unsigned long rwflag, const void* data)
 {
-    return DFS_STATUS_OK;
+    return RT_EOK;
 }
 
 int dfs_skt_unmount(struct dfs_filesystem* fs)
 {
-    return DFS_STATUS_OK;
+    return RT_EOK;
 }
 
 int dfs_skt_ioctl(struct dfs_fd* file, int cmd, void* args)
 {
-    return -DFS_STATUS_EIO;
+    return -RT_EIO;
 }
 
 int dfs_skt_read(struct dfs_fd* file, void *buf, rt_size_t count)
@@ -49,22 +50,22 @@ int dfs_skt_read(struct dfs_fd* file, void *buf, rt_size_t count)
 
 int dfs_skt_lseek(struct dfs_fd* file, rt_off_t offset)
 {
-    return -DFS_STATUS_EIO;
+    return -RT_EIO;
 }
 
 int dfs_skt_close(struct dfs_fd* file)
 {
-    return DFS_STATUS_OK;
+    return RT_EOK;
 }
 
 int dfs_skt_open(struct dfs_fd* file)
 {
-    return DFS_STATUS_OK;
+    return RT_EOK;
 }
 
 int dfs_skt_stat(struct dfs_filesystem* fs, const char *path, struct stat *st)
 {
-    return DFS_STATUS_OK;
+    return RT_EOK;
 }
 
 int dfs_skt_getdents(struct dfs_fd* file, struct dirent* dirp, rt_uint32_t count)
@@ -72,26 +73,32 @@ int dfs_skt_getdents(struct dfs_fd* file, struct dirent* dirp, rt_uint32_t count
     return count * sizeof(struct dirent);
 }
 
-static const struct dfs_filesystem_operation _skt_fs = 
+static const struct dfs_file_ops _skt_fops = 
 {
-    "skt",
-    DFS_FS_FLAG_DEFAULT,
-    dfs_skt_mount,
-    dfs_skt_unmount,
-    RT_NULL,
-    RT_NULL,
-
     dfs_skt_open,
     dfs_skt_close,
     dfs_skt_ioctl,
     dfs_skt_read,
-    RT_NULL,
-    RT_NULL,
+    NULL, /* write */
+    NULL, /* flush */
     dfs_skt_lseek,
     dfs_skt_getdents,
-    RT_NULL,
+};
+
+static const struct dfs_filesystem_ops _skt_fs =
+{
+    "skt",
+    DFS_FS_FLAG_DEFAULT,
+    &_skt_fops,
+
+    dfs_skt_mount,
+    dfs_skt_unmount,
+    NULL, /* mkfs */
+    NULL, /* statfs */
+
+    NULL, /* unlink */
     dfs_skt_stat,
-    RT_NULL,
+    NULL, /* rename */
 };
 
 int dfs_skt_init(void)
@@ -100,4 +107,5 @@ int dfs_skt_init(void)
     dfs_register(&_skt_fs);
     return 0;
 }
-INIT_FS_EXPORT(dfs_skt_init);
+INIT_COMPONENT_EXPORT(dfs_skt_init);
+
diff --git a/components/dfs/filesystems/uffs/dfs_uffs.c b/components/dfs/filesystems/uffs/dfs_uffs.c
index 815b5dde7d68991b27a0df066c03e17b55bad857..0256a524d5595dcc039e5028cf46ee1b8ed42959 100644
--- a/components/dfs/filesystems/uffs/dfs_uffs.c
+++ b/components/dfs/filesystems/uffs/dfs_uffs.c
@@ -668,5 +668,5 @@ int dfs_uffs_init(void)
     }
     return -RT_ERROR;
 }
-INIT_FS_EXPORT(dfs_uffs_init);
+INIT_COMPONENT_EXPORT(dfs_uffs_init);
 
diff --git a/components/net/lwip-1.4.1/src/netif/ethernetif.c b/components/net/lwip-1.4.1/src/netif/ethernetif.c
index 9fbb883f363fb2d0b95bd84e5ca210a689e7a19c..7a8cde12da1d04c3e3eee9e713c3ef7a82392b14 100644
--- a/components/net/lwip-1.4.1/src/netif/ethernetif.c
+++ b/components/net/lwip-1.4.1/src/netif/ethernetif.c
@@ -434,9 +434,9 @@ int eth_system_device_init(void)
     RT_ASSERT(result == RT_EOK);
 #endif
 
-	return (int)result;
+    return (int)result;
 }
-INIT_DEVICE_EXPORT(eth_system_device_init);
+INIT_PREV_EXPORT(eth_system_device_init);
 
 #ifdef RT_USING_FINSH
 #include <finsh.h>
diff --git a/components/net/lwip-2.0.2/src/netif/ethernetif.c b/components/net/lwip-2.0.2/src/netif/ethernetif.c
index 09d6140b16e8fdbebe4806d305ff32e64b0e913c..08d1242e71bd4832637854ad6a5c01085c8a192a 100644
--- a/components/net/lwip-2.0.2/src/netif/ethernetif.c
+++ b/components/net/lwip-2.0.2/src/netif/ethernetif.c
@@ -452,7 +452,7 @@ int eth_system_device_init(void)
 
     return (int)result;
 }
-INIT_DEVICE_EXPORT(eth_system_device_init);
+INIT_PREV_EXPORT(eth_system_device_init);
 
 #ifdef RT_USING_FINSH
 #include <finsh.h>
diff --git a/include/rtdef.h b/include/rtdef.h
index 43920ea3259c8863c85bda0cefa4b83a5646ac23..c7c0594ff443e990999b03bd943063215c0b6089 100644
--- a/include/rtdef.h
+++ b/include/rtdef.h
@@ -199,15 +199,14 @@ typedef int (*init_fn_t)(void);
 
 /* board init routines will be called in board_init() function */
 #define INIT_BOARD_EXPORT(fn)           INIT_EXPORT(fn, "1")
-/* device/component/fs/app init routines will be called in init_thread */
-/* device initialization */
-#define INIT_DEVICE_EXPORT(fn)          INIT_EXPORT(fn, "2")
+
+/* pre/device/component/env/app init routines will be called in init_thread */
 /* components pre-initialization (pure software initilization) */
 #define INIT_PREV_EXPORT(fn)            INIT_EXPORT(fn, "2")
+/* device initialization */
+#define INIT_DEVICE_EXPORT(fn)          INIT_EXPORT(fn, "3")
 /* components initialization (dfs, lwip, ...) */
-#define INIT_COMPONENT_EXPORT(fn)       INIT_EXPORT(fn, "3")
-/* file system initialization (dfs-elm, dfs-rom, ...) */
-#define INIT_FS_EXPORT(fn)              INIT_EXPORT(fn, "4")
+#define INIT_COMPONENT_EXPORT(fn)       INIT_EXPORT(fn, "4")
 /* environment initialization (mount disk, ...) */
 #define INIT_ENV_EXPORT(fn)             INIT_EXPORT(fn, "5")
 /* appliation initialization (rtgui application etc ...) */