[Kernel] Change the order of initialization.

1. Remove INIT_FS_EXPORT and change INIT_DEVICE_EXPORT as the first item
in the initalization thread.
2. Move the eth_system_device_init into INIT_PREV_EXPORT item.

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

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);
 

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);
+

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)
 {

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);
 

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);
+

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);