modify nuttx bug of lack of files

2021-06-11 11:25:07 +08:00
parent 4a7f51a5e9
commit 6d0f2ca39a
6752 changed files with 1528133 additions and 0 deletions
@@ -0,0 +1,168 @@
+/****************************************************************************
+ * drivers/loop/loop.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 <sys/types.h>
+#include <stdbool.h>
+#include <string.h>
+#include <errno.h>
+
+#include <nuttx/fs/fs.h>
+#include <nuttx/fs/loop.h>
+
+#ifdef CONFIG_DEV_LOOP
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+static ssize_t loop_read(FAR struct file *filep, FAR char *buffer,
+                 size_t buflen);
+static ssize_t loop_write(FAR struct file *filep, FAR const char *buffer,
+                 size_t buflen);
+static int     loop_ioctl(FAR struct file *filep, int cmd,
+                 unsigned long arg);
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static const struct file_operations g_loop_fops =
+{
+  NULL,          /* open */
+  NULL,          /* close */
+  loop_read,     /* read */
+  loop_write,    /* write */
+  NULL,          /* seek */
+  loop_ioctl,    /* ioctl */
+  NULL           /* poll */
+};
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: loop_read
+ ****************************************************************************/
+
+static ssize_t loop_read(FAR struct file *filep, FAR char *buffer,
+                         size_t len)
+{
+  return 0; /* Return EOF */
+}
+
+/****************************************************************************
+ * Name: loop_write
+ ****************************************************************************/
+
+static ssize_t loop_write(FAR struct file *filep, FAR const char *buffer,
+                          size_t len)
+{
+  return len; /* Say that everything was written */
+}
+
+/****************************************************************************
+ * Name: loop_ioctl
+ ****************************************************************************/
+
+static int loop_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
+{
+  int ret;
+
+  switch (cmd)
+    {
+    /* Command:      LOOPIOC_SETUP
+     * Description:  Setup the loop device
+     * Argument:     A pointer to a read-only instance of struct losetup_s.
+     * Dependencies: The loop device must be enabled (CONFIG_DEV_LOOP=y)
+     */
+
+    case LOOPIOC_SETUP:
+      {
+         FAR struct losetup_s *setup =
+           (FAR struct losetup_s *)((uintptr_t)arg);
+
+        if (setup == NULL)
+          {
+            ret = -EINVAL;
+          }
+        else
+          {
+            ret = losetup(setup->devname, setup->filename, setup->sectsize,
+                          setup->offset, setup->readonly);
+          }
+      }
+      break;
+
+    /* Command:      LOOPIOC_TEARDOWN
+     * Description:  Teardown a loop device previously setup via
+                     LOOPIOC_SETUP
+     * Argument:     A read-able pointer to the path of the device to be
+     *               torn down
+     * Dependencies: The loop device must be enabled (CONFIG_DEV_LOOP=y)
+     */
+
+    case LOOPIOC_TEARDOWN:
+      {
+        FAR const char *devname = (FAR const char *)((uintptr_t)arg);
+
+        if (devname == NULL)
+          {
+            ret = -EINVAL;
+          }
+        else
+          {
+            ret = loteardown(devname);
+          }
+       }
+       break;
+
+     default:
+       ret = -ENOTTY;
+       break;
+    }
+
+  return ret;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: loop_register
+ *
+ * Description:
+ *   Register /dev/null
+ *
+ ****************************************************************************/
+
+void loop_register(void)
+{
+  register_driver("/dev/loop", &g_loop_fops, 0666, NULL);
+}
+
+#endif /* CONFIG_DEV_LOOP */