From 42ee2e0938c7adec8da26ac544204d32f3af709b Mon Sep 17 00:00:00 2001
From: Roman Vaughan <nzsmartie@gmail.com>
Date: Sat, 30 May 2020 23:57:17 +1200
Subject: [PATCH] fs: Set MAX_FILE_NAME appropiately with LFN and FATFS

Try to define MAX_FILE_NAME to the appropriate max length based on the
selected filesystm. Otherwise fallback to a standard filename of 12
(made up of 8.3 : <filename>.<extension>)

Signed-off-by: Roman Vaughan <nzsmartie@gmail.com>
---
 include/fs/fs_interface.h | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/include/fs/fs_interface.h b/include/fs/fs_interface.h
index 42bbd1133bf..283e1cbcd41 100644
--- a/include/fs/fs_interface.h
+++ b/include/fs/fs_interface.h
@@ -13,9 +13,16 @@ extern "C" {
 
 #if defined(CONFIG_FILE_SYSTEM_LITTLEFS)
 #define MAX_FILE_NAME 256
-#else /* FAT_FS */
+#elif defined(CONFIG_FAT_FILESYSTEM_ELM)
+#if defined(CONFIG_FS_FATFS_LFN)
+#define MAX_FILE_NAME CONFIG_FS_FATFS_MAX_LFN
+#else /* CONFIG_FS_FATFS_LFN */
 #define MAX_FILE_NAME 12 /* Uses 8.3 SFN */
-#endif
+#endif /* CONFIG_FS_FATFS_LFN */
+#else /* filesystem selection */
+/* Use standard 8.3 when no filesystem is explicitly selected */
+#define MAX_FILE_NAME 12
+#endif /* filesystem selection */
 
 struct fs_mount_t;