From c9f3b3a7f100e11e9d6bf28bc70ed2c2cd2a8dac Mon Sep 17 00:00:00 2001
From: YAMAMOTO Takashi <yamamoto@midokura.com>
Date: Mon, 11 Apr 2022 14:04:33 +0900
Subject: [PATCH] littelfs: deal with block devices w/o ioctl

Note: Some block devices has ioctl == NULL. eg. drivers/loop
---
 fs/littlefs/lfs_vfs.c | 30 ++++++++++++++++++++++++++----
 1 file changed, 26 insertions(+), 4 deletions(-)

diff --git a/fs/littlefs/lfs_vfs.c b/fs/littlefs/lfs_vfs.c
index 2a6ff299270..3850cdd9c6f 100644
--- a/fs/littlefs/lfs_vfs.c
+++ b/fs/littlefs/lfs_vfs.c
@@ -563,7 +563,14 @@ static int littlefs_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
     }
   else
     {
-      return drv->u.i_bops->ioctl(drv, cmd, arg);
+      if (drv->u.i_bops->ioctl != NULL)
+        {
+          return drv->u.i_bops->ioctl(drv, cmd, arg);
+        }
+      else
+        {
+          return -ENOTTY;
+        }
     }
 }
 
@@ -998,7 +1005,14 @@ static int littlefs_sync_block(FAR const struct lfs_config *c)
     }
   else
     {
-      ret = drv->u.i_bops->ioctl(drv, BIOC_FLUSH, 0);
+      if (drv->u.i_bops->ioctl != NULL)
+        {
+          ret = drv->u.i_bops->ioctl(drv, BIOC_FLUSH, 0);
+        }
+      else
+        {
+          ret = -ENOTTY;
+        }
     }
 
   return ret == -ENOTTY ? OK : ret;
@@ -1053,8 +1067,16 @@ static int littlefs_bind(FAR struct inode *driver, FAR const void *data,
     {
       /* Try to get FLT MTD geometry first */
 
-      ret = driver->u.i_bops->ioctl(driver, MTDIOC_GEOMETRY,
-                                    (unsigned long)&fs->geo);
+      if (driver->u.i_bops->ioctl != NULL)
+        {
+          ret = driver->u.i_bops->ioctl(driver, MTDIOC_GEOMETRY,
+                                        (unsigned long)&fs->geo);
+        }
+      else
+        {
+          ret = -ENOTTY;
+        }
+
       if (ret < 0)
         {
           struct geometry geometry;