1 files changed, 112 insertions, 0 deletions
diff --git a/fs/sdcardfs/xattr.c b/fs/sdcardfs/xattr.c
new file mode 100644
index 00000000..db00ed7d
--- /dev/null
+++ b/fs/sdcardfs/xattr.c
@@ -0,0 +1,112 @@
+/*
+ * fs/sdcardfs/xattr.c
+ *
+ * Copyright (c) 2015 Lenovo Co. Ltd
+ *   Authors: liaohs , jixj
+
+ *
+ * This program has been developed as a stackable file system based on
+ * the WrapFS which written by 
+ *
+ * Copyright (c) 1998-2014 Erez Zadok
+ * Copyright (c) 2009	   Shrikar Archak
+ * Copyright (c) 2003-2014 Stony Brook University
+ * Copyright (c) 2003-2014 The Research Foundation of SUNY
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/xattr.h>
+#include <linux/dcache.h>
+#include "sdcardfs.h"
+
+static struct dentry *
+sdcardfs_dentry_to_lower(struct dentry *dentry)
+{
+    struct dentry* ret;
+
+    ret = ((struct sdcardfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry;
+    return ret;
+}
+
+int
+sdcardfs_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags)
+{
+	int rc = 0;
+	struct dentry *lower_dentry;
+
+	lower_dentry = sdcardfs_dentry_to_lower(dentry);
+	if (!lower_dentry->d_inode->i_op->setxattr) {
+		rc = -EOPNOTSUPP;
+		goto out;
+	}
+
+	rc = vfs_setxattr(lower_dentry, name, value, size, flags);
+out:
+	return rc;
+}
+
+static ssize_t
+sdcardfs_getxattr_lower(struct dentry *lower_dentry, const char *name, void *value, size_t size)
+{
+	int rc = 0;
+
+	if (!lower_dentry->d_inode->i_op->getxattr) {
+		rc = -EOPNOTSUPP;
+		goto out;
+	}
+	mutex_lock(&lower_dentry->d_inode->i_mutex);
+	rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value,
+						   size);
+	mutex_unlock(&lower_dentry->d_inode->i_mutex);
+out:
+	return rc;
+}
+
+ssize_t
+sdcardfs_getxattr(struct dentry *dentry, const char *name, void *value, size_t size)
+{
+    ssize_t ret;
+	ret = sdcardfs_getxattr_lower(sdcardfs_dentry_to_lower(dentry), name,
+				       value, size);
+    return ret;
+}
+
+ssize_t
+sdcardfs_listxattr(struct dentry *dentry, char *list, size_t size)
+{
+	int rc = 0;
+	struct dentry *lower_dentry;
+
+	lower_dentry = sdcardfs_dentry_to_lower(dentry);
+	if (!lower_dentry->d_inode->i_op->listxattr) {
+		rc = -EOPNOTSUPP;
+		goto out;
+	}
+	mutex_lock(&lower_dentry->d_inode->i_mutex);
+	rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size);
+	mutex_unlock(&lower_dentry->d_inode->i_mutex);
+out:
+	return rc;
+}
+
+int
+sdcardfs_removexattr(struct dentry *dentry, const char *name)
+{
+	int rc = 0;
+	struct dentry *lower_dentry;
+
+	lower_dentry = sdcardfs_dentry_to_lower(dentry);
+	if (!lower_dentry->d_inode->i_op->removexattr) {
+		rc = -EOPNOTSUPP;
+		goto out;
+	}
+	mutex_lock(&lower_dentry->d_inode->i_mutex);
+	rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name);
+	mutex_unlock(&lower_dentry->d_inode->i_mutex);
+out:
+	return rc;
+}