[DFS/FEATURE] Support ISO9660

1. Not support link.
2. Fixup the DFS open flag with readonly.

Link: #9270

Signed-off-by: GuEe-GUI <[email protected]>

Author: GuEe-GUI

components/dfs/Kconfig

@@ -162,6 +162,13 @@ endif
         bool "Using devfs for device objects"
         default y
 
+if RT_USING_DFS_V1
+    config RT_USING_DFS_ISO9660
+        bool "Using ISO9660 filesystem"
+        depends on RT_USING_MEMHEAP
+        default n
+endif
+
     config RT_USING_DFS_ROMFS
         bool "Enable ReadOnly file system on flash"
         default n

components/dfs/dfs_v1/filesystems/iso9660/SConscript

@@ -0,0 +1,11 @@
+# RT-Thread building script for component
+
+from building import *
+
+cwd = GetCurrentDir()
+src = Glob('*.c')
+CPPPATH = [cwd]
+
+group = DefineGroup('Filesystem', src, depend = ['RT_USING_DFS', 'RT_USING_DFS_ISO9660'], CPPPATH = CPPPATH)
+
+Return('group')

components/dfs/dfs_v1/filesystems/iso9660/dfs_iso9660.c

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2006-2023, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2023-02-25     GuEe-GUI     the first version
+ */
+
+#ifndef __DFS_ISO9660_H__
+#define __DFS_ISO9660_H__
+
+int dfs_iso9660_init(void);
+
+#endif /* __DFS_ISO9660_H__ */

components/dfs/dfs_v1/filesystems/iso9660/dfs_iso9660.h

@@ -322,8 +322,8 @@ int dfs_mount(const char   *device_name,
     /* open device, but do not check the status of device */
     if (dev_id != NULL)
     {
-        if (rt_device_open(fs->dev_id,
-                           RT_DEVICE_OFLAG_RDWR) != RT_EOK)
+        if (rt_device_open(fs->dev_id, RT_DEVICE_OFLAG_RDWR) != RT_EOK &&
+            rt_device_open(fs->dev_id, RT_DEVICE_OFLAG_RDONLY) != RT_EOK)
         {
             /* The underlying device has error, clear the entry. */
             dfs_lock();