Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / fs / 9p / xattr_security.c

diff --git a/kernel/fs/9p/xattr_security.c b/kernel/fs/9p/xattr_security.c
new file mode 100644 (file)
index 0000000..cb247a1
--- /dev/null
+++ b/kernel/fs/9p/xattr_security.c
@@ -0,0 +1,80 @@
+/*
+ * Copyright IBM Corporation, 2010
+ * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2.1 of the GNU Lesser General Public License
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ */
+
+
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include "xattr.h"
+
+static int v9fs_xattr_security_get(struct dentry *dentry, const char *name,
+                       void *buffer, size_t size, int type)
+{
+       int retval;
+       char *full_name;
+       size_t name_len;
+       size_t prefix_len = XATTR_SECURITY_PREFIX_LEN;
+
+       if (name == NULL)
+               return -EINVAL;
+
+       if (strcmp(name, "") == 0)
+               return -EINVAL;
+
+       name_len = strlen(name);
+       full_name = kmalloc(prefix_len + name_len + 1 , GFP_KERNEL);
+       if (!full_name)
+               return -ENOMEM;
+       memcpy(full_name, XATTR_SECURITY_PREFIX, prefix_len);
+       memcpy(full_name+prefix_len, name, name_len);
+       full_name[prefix_len + name_len] = '\0';
+
+       retval = v9fs_xattr_get(dentry, full_name, buffer, size);
+       kfree(full_name);
+       return retval;
+}
+
+static int v9fs_xattr_security_set(struct dentry *dentry, const char *name,
+                       const void *value, size_t size, int flags, int type)
+{
+       int retval;
+       char *full_name;
+       size_t name_len;
+       size_t prefix_len = XATTR_SECURITY_PREFIX_LEN;
+
+       if (name == NULL)
+               return -EINVAL;
+
+       if (strcmp(name, "") == 0)
+               return -EINVAL;
+
+       name_len = strlen(name);
+       full_name = kmalloc(prefix_len + name_len + 1 , GFP_KERNEL);
+       if (!full_name)
+               return -ENOMEM;
+       memcpy(full_name, XATTR_SECURITY_PREFIX, prefix_len);
+       memcpy(full_name + prefix_len, name, name_len);
+       full_name[prefix_len + name_len] = '\0';
+
+       retval = v9fs_xattr_set(dentry, full_name, value, size, flags);
+       kfree(full_name);
+       return retval;
+}
+
+struct xattr_handler v9fs_xattr_security_handler = {
+       .prefix = XATTR_SECURITY_PREFIX,
+       .get    = v9fs_xattr_security_get,
+       .set    = v9fs_xattr_security_set,
+};