driver: move find_mtddriver() to fs.h and add close_mtddriver.c

Rpmsg mtd need a way to find the mtd device according to the
mtd device path.

Signed-off-by: wangbowen6 <wangbowen6@xiaomi.com>

fs/driver/Make.defs

@@ -25,7 +25,7 @@ CSRCS += fs_registerdriver.c fs_unregisterdriver.c
 ifneq ($(CONFIG_DISABLE_MOUNTPOINT),y)
 CSRCS += fs_registerblockdriver.c fs_unregisterblockdriver.c
 CSRCS += fs_findblockdriver.c fs_openblockdriver.c fs_closeblockdriver.c
-CSRCS += fs_blockpartition.c fs_findmtddriver.c
+CSRCS += fs_blockpartition.c fs_findmtddriver.c fs_closemtddriver.c
 
 ifeq ($(CONFIG_MTD),y)
 CSRCS += fs_registermtddriver.c fs_unregistermtddriver.c

fs/driver/driver.h

@@ -124,28 +124,6 @@ int mtd_proxy(FAR const char *mtddev, int mountflags,
               FAR struct inode **ppinode);
 #endif
 
-/****************************************************************************
- * Name: find_mtddriver
- *
- * Description:
- *   Return the inode of the named MTD driver specified by 'pathname'
- *
- * Input Parameters:
- *   pathname   - the full path to the named MTD driver to be located
- *   ppinode    - address of the location to return the inode reference
- *
- * Returned Value:
- *   Returns zero on success or a negated errno on failure:
- *
- *   ENOENT  - No MTD driver of this name is registered
- *   ENOTBLK - The inode associated with the pathname is not an MTD driver
- *
- ****************************************************************************/
-
-#ifndef CONFIG_DISABLE_MOUNTPOINT
-int find_mtddriver(FAR const char *pathname, FAR struct inode **ppinode);
-#endif
-
 #undef EXTERN
 #if defined(__cplusplus)
 }

fs/driver/fs_closemtddriver.c

@@ -0,0 +1,71 @@
+/****************************************************************************
+ * fs/driver/fs_closemtddriver.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <errno.h>
+#include <nuttx/fs/fs.h>
+
+#include "inode/inode.h"
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: close_mtddriver
+ *
+ * Description:
+ *   Release the inode got by function find_mtddriver()
+ *
+ * Input Parameters:
+ *   pinode    - pointer to the inode
+ *
+ * Returned Value:
+ *   Returns zero on success or a negated errno on failure:
+ *
+ *   EINVAL  - inode is NULL
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_MTD
+int close_mtddriver(FAR struct inode *pinode)
+{
+  /* Sanity checks */
+
+  if (pinode == NULL)
+    {
+      return -EINVAL;
+    }
+
+  inode_release(pinode);
+
+  return OK;
+}
+#else
+int close_mtddriver(FAR struct inode *pinode)
+{
+  return -ENODEV;
+}
+#endif /* CONFIG_MTD */

fs/driver/fs_findmtddriver.c

@@ -33,7 +33,6 @@
 #include <nuttx/fs/fs.h>
 
 #include "inode/inode.h"
-#include "driver/driver.h"
 
 #ifdef CONFIG_MTD
 

include/nuttx/fs/fs.h

@@ -986,6 +986,44 @@ int open_blockdriver(FAR const char *pathname, int mountflags,
 
 int close_blockdriver(FAR struct inode *inode);
 
+/****************************************************************************
+ * Name: find_mtddriver
+ *
+ * Description:
+ *   Return the inode of the named MTD driver specified by 'pathname'
+ *
+ * Input Parameters:
+ *   pathname   - the full path to the named MTD driver to be located
+ *   ppinode    - address of the location to return the inode reference
+ *
+ * Returned Value:
+ *   Returns zero on success or a negated errno on failure:
+ *
+ *   ENOENT  - No MTD driver of this name is registered
+ *   ENOTBLK - The inode associated with the pathname is not an MTD driver
+ *
+ ****************************************************************************/
+
+int find_mtddriver(FAR const char *pathname, FAR struct inode **ppinode);
+
+/****************************************************************************
+ * Name: close_mtddriver
+ *
+ * Description:
+ *   Release the inode got by function find_mtddriver()
+ *
+ * Input Parameters:
+ *   pinode    - pointer to the inode
+ *
+ * Returned Value:
+ *   Returns zero on success or a negated errno on failure:
+ *
+ *   EINVAL  - inode is NULL
+ *
+ ****************************************************************************/
+
+int close_mtddriver(FAR struct inode *pinode);
+
 /****************************************************************************
  * Name: fs_fdopen
  *