drivers/mtd/ftl.c: Support BIOC_FLUSH ioctl

drivers/mtd/ftl.c

@@ -156,7 +156,11 @@ static int ftl_open(FAR struct inode *inode)
 
 static int ftl_close(FAR struct inode *inode)
 {
-  finfo("Entry\n");
+#ifdef CONFIG_FTL_WRITEBUFFER
+  struct ftl_struct_s *dev = (struct ftl_struct_s *)inode->i_private;
+  rwb_flush(&dev->rwb);
+#endif
+
   return OK;
 }
 
@@ -464,6 +468,8 @@ static int ftl_ioctl(FAR struct inode *inode, int cmd, unsigned long arg)
   finfo("Entry\n");
   DEBUGASSERT(inode && inode->i_private);
 
+  dev = (struct ftl_struct_s *)inode->i_private;
+
   /* Only one block driver ioctl command is supported by this driver (and
    * that command is just passed on to the MTD driver in a slightly
    * different form).
@@ -488,13 +494,18 @@ static int ftl_ioctl(FAR struct inode *inode, int cmd, unsigned long arg)
 
       cmd = MTDIOC_XIPBASE;
     }
+#ifdef CONFIG_FTL_WRITEBUFFER
+  else if (cmd == BIOC_FLUSH)
+    {
+      return rwb_flush(&dev->rwb);
+    }
+#endif
 
   /* No other block driver ioctl commmands are not recognized by this
    * driver.  Other possible MTD driver ioctl commands are passed through
    * to the MTD driver (unchanged).
    */
 
-  dev = (struct ftl_struct_s *)inode->i_private;
   ret = MTD_IOCTL(dev->mtd, cmd, arg);
   if (ret < 0)
     {

drivers/rwbuffer.c

@@ -167,8 +167,6 @@ static void rwb_wrflush(struct rwbuffer_s *rwb)
 {
   int ret;
 
-  finfo("Timeout!\n");
-
   if (rwb->wrnblocks > 0)
     {
       finfo("Flushing: blockstart=0x%08lx nblocks=%d from buffer=%p\n",
@@ -203,6 +201,8 @@ static void rwb_wrtimeout(FAR void *arg)
   FAR struct rwbuffer_s *rwb = (struct rwbuffer_s *)arg;
   DEBUGASSERT(rwb != NULL);
 
+  finfo("Timeout!\n");
+
   /* If a timeout elapses with with write buffer activity, this watchdog
    * handler function will be evoked on the thread of execution of the
    * worker thread.
@@ -1123,5 +1123,25 @@ int rwb_invalidate(FAR struct rwbuffer_s *rwb,
 }
 #endif
 
+/****************************************************************************
+ * Name: rwb_flush
+ *
+ * Description:
+ *   Flush the write buffer
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_DRVR_WRITEBUFFER
+int rwb_flush(FAR struct rwbuffer_s *rwb)
+{
+  rwb_semtake(&rwb->wrsem);
+  rwb_wrcanceltimeout(rwb);
+  rwb_wrflush(rwb);
+  rwb_semgive(&rwb->wrsem);
+
+  return OK;
+}
+#endif
+
 #endif /* CONFIG_DRVR_WRITEBUFFER || CONFIG_DRVR_READAHEAD */
 

include/nuttx/drivers/rwbuffer.h

@@ -202,6 +202,10 @@ int rwb_invalidate(FAR struct rwbuffer_s *rwb,
                    off_t startblock, size_t blockcount);
 #endif
 
+#ifdef CONFIG_DRVR_WRITEBUFFER
+int rwb_flush(FAR struct rwbuffer_s *rwb);
+#endif
+
 #undef EXTERN
 #if defined(__cplusplus)
 }

include/nuttx/fs/ioctl.h

@@ -257,6 +257,10 @@
                                            *      to return geometry.
                                            * OUT: Data return in user-provided
                                            *      buffer. */
+#define BIOC_FLUSH      _BIOC(0x000d)     /* Flush the block device write buffer
+                                           * IN:  None
+                                           * OUT: None (ioctl return value provides
+                                           *      success/failure indication). */
 
 /* NuttX MTD driver ioctl definitions ***************************************/