From 181eb79616a343905f5f9c2656d6e956c9b58135 Mon Sep 17 00:00:00 2001
From: Gregory Nutt <gnutt@nuttx.org>
Date: Mon, 13 Feb 2017 08:22:05 -0600
Subject: [PATCH] fstat:  Add fstat() support to nxffs.

---
 fs/nxffs/nxffs_stat.c | 48 ++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 45 insertions(+), 3 deletions(-)

diff --git a/fs/nxffs/nxffs_stat.c b/fs/nxffs/nxffs_stat.c
index a896c299aa..7a0f3a2b04 100644
--- a/fs/nxffs/nxffs_stat.c
+++ b/fs/nxffs/nxffs_stat.c
@@ -47,6 +47,7 @@
 #include <string.h>
 #include <fcntl.h>
 #include <assert.h>
+#include <errno.h>
 #include <debug.h>
 
 #include <nuttx/fs/fs.h>
@@ -149,6 +150,8 @@ int nxffs_stat(FAR struct inode *mountpt, FAR const char *relpath,
           goto errout_with_semaphore;
         }
 
+      /* Return status information based on the directory entry */
+
       buf->st_blocks  = entry.datlen / (volume->geo.blocksize - SIZEOF_NXFFS_BLOCK_HDR);
       buf->st_mode    = S_IFREG | S_IXOTH | S_IXGRP | S_IXUSR;
       buf->st_size    = entry.datlen;
@@ -187,7 +190,46 @@ errout:
 
 int nxffs_fstat(FAR const struct file *filep, FAR struct stat *buf)
 {
-#warning Missing logic
-  return -ENOSYS;
-}
 
+  FAR struct nxffs_volume_s *volume;
+  FAR struct nxffs_ofile_s *ofile;
+  int ret;
+
+  finfo("Buf %s\n", buf);
+  DEBUGASSERT(filep != NULL && buf != NULL);
+
+  /* Recover the open file state from the struct file instance */
+
+  DEBUGASSERT(filep->f_priv != NULL && filep->f_inode != NULL);
+  ofile = (FAR struct nxffs_ofile_s *)filep->f_priv;
+
+  /* Recover the volume state from the open file */
+
+  volume = (FAR struct nxffs_volume_s *)filep->f_inode->i_private;
+  DEBUGASSERT(volume != NULL);
+
+  /* Get exclusive access to the volume.  Note that the volume exclsem
+   * protects the open file list.
+   */
+
+  ret = sem_wait(&volume->exclsem);
+  if (ret != OK)
+    {
+      int errcode = get_errno();
+      ferr("ERROR: sem_wait failed: %d\n", errcode);
+      return -errcode;
+    }
+
+  /* Return status information based on the directory entry */
+
+  buf->st_blocks = ofile->entry.datlen /
+                   (volume->geo.blocksize - SIZEOF_NXFFS_BLOCK_HDR);
+  buf->st_mode   = S_IFREG | S_IXOTH | S_IXGRP | S_IXUSR;
+  buf->st_size   = ofile->entry.datlen;
+  buf->st_atime  = ofile->entry.utc;
+  buf->st_mtime  = ofile->entry.utc;
+  buf->st_ctime  = ofile->entry.utc;
+
+  sem_post(&volume->exclsem);
+  return OK;
+}