fix <BAD file> issue on mount point directory

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1237 bbd45198-f89e-11dd-88c7-29a3b14d5316

components/dfs/filesystems/elmfat/ffconf.h

@@ -102,8 +102,11 @@
 /  two Unicode handling functions ff_convert() and ff_wtoupper() must be added
 /  to the project. */
 
-
+#ifdef RT_DFS_ELM_LFN_UNICODE
+#define _LFN_UNICODE	1	/* 0 or 1 */
+#else
 #define	_LFN_UNICODE	0	/* 0 or 1 */
+#endif
 /* To switch the character code set on FatFs API to Unicode,
 /  enable LFN feature and set _LFN_UNICODE to 1.
 */

components/dfs/src/dfs_file.c

@@ -333,7 +333,8 @@ int dfs_file_stat(const char *path, struct stat *buf)
 		return -DFS_STATUS_ENOENT;
 	}
 
-	if (fullpath[0] == '/' && fullpath[1] == '\0')
+	if ((fullpath[0] == '/' && fullpath[1] == '\0') ||
+		(dfs_subdir(fs->path, fullpath) == RT_NULL))
 	{
 		/* it's the root directory */
 		buf->st_dev   = 0;
@@ -351,9 +352,8 @@ int dfs_file_stat(const char *path, struct stat *buf)
 
 		return DFS_STATUS_OK;
 	}
-	
-	/* get the real file path */
-	
+	else
+	{
 		if (fs->ops->stat == RT_NULL)
 		{
 			rt_free(fullpath);
@@ -361,10 +361,9 @@ int dfs_file_stat(const char *path, struct stat *buf)
 			return -DFS_STATUS_ENOSYS;
 		}
 
-	if (dfs_subdir(fs->path, fullpath) == RT_NULL)
-		result = fs->ops->stat(fs, "/", buf);
-	else
+		/* get the real file path and get file stat */
 		result = fs->ops->stat(fs, dfs_subdir(fs->path, fullpath), buf);
+	}
 
 	rt_free(fullpath);
 

components/dfs/src/dfs_fs.c

@@ -96,8 +96,12 @@ struct dfs_filesystem* dfs_filesystem_lookup(const char *path)
 		}
 
         if ((filesystem_table[index].ops != RT_NULL) &&
-                strncmp(filesystem_table[index].path, path, fspath) == 0)
+            (strncmp(filesystem_table[index].path, path, fspath) == 0))
         {
+        	/* check next path separator */
+        	if ( fspath > 1 && (strlen(path) > fspath) &&
+        		(path[fspath] != '/')) continue;
+
             fs = &filesystem_table[index];
             prefixlen = fspath;
         }