!100 解决kernel/liteos_a仓下关闭fat，编译不过的问题

Merge pull request !100 from li_zan/master

fs/vfs/disk/disk.c

@@ -76,12 +76,12 @@ UINT32 g_usbMode = 0;
 
 typedef VOID *(*StorageHookFunction)(VOID *);
 
+#ifdef LOSCFG_FS_FAT_CACHE
 static UINT32 OsReHookFuncAddDiskRef(StorageHookFunction handler,
                                      VOID *param) __attribute__((weakref("osReHookFuncAdd")));
 
 static UINT32 OsReHookFuncDelDiskRef(StorageHookFunction handler) __attribute__((weakref("osReHookFuncDel")));
 
-#ifdef LOSCFG_FS_FAT_CACHE
 UINT32 GetFatBlockNums(VOID)
 {
     return g_uwFatBlockNums;

kernel/common/los_rootfs.c

@@ -437,11 +437,13 @@ STATIC VOID OsMountUserdata(const CHAR *fsType)
     }
     err = get_errno();
     if (err == ENOENT) {
+#ifdef LOSCFG_FS_FAT
         ret = format(emmcUserdataDev, 0, FM_FAT32);
         if (ret != LOS_OK) {
             PRINT_ERR("Failed to format %s\n", emmcUserdataDev);
             return;
         }
+#endif
         ret = mount(emmcUserdataDev, userdataDir, fsType, 0, "umask=000");
         if (ret != LOS_OK) {
             err = get_errno();