1 files changed, 77 insertions, 0 deletions

diff --git a/fs/ext2/xattr_user.c b/fs/ext2/xattr_user.c
new file mode 100644
index 000000000000..0c03ea131a94
--- /dev/null
+++ b/fs/ext2/xattr_user.c
@@ -0,0 +1,77 @@
+/*
+ * linux/fs/ext2/xattr_user.c
+ * Handler for extended user attributes.
+ *
+ * Copyright (C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include "ext2.h"
+#include "xattr.h"
+
+#define XATTR_USER_PREFIX "user."
+
+static size_t
+ext2_xattr_user_list(struct inode *inode, char *list, size_t list_size,
+                     const char *name, size_t name_len)
+{
+        const size_t prefix_len = sizeof(XATTR_USER_PREFIX)-1;
+        const size_t total_len = prefix_len + name_len + 1;
+
+        if (!test_opt(inode->i_sb, XATTR_USER))
+                return 0;
+
+        if (list && total_len <= list_size) {
+                memcpy(list, XATTR_USER_PREFIX, prefix_len);
+                memcpy(list+prefix_len, name, name_len);
+                list[prefix_len + name_len] = '\0';
+        }
+        return total_len;
+}
+
+static int
+ext2_xattr_user_get(struct inode *inode, const char *name,
+                    void *buffer, size_t size)
+{
+        int error;
+
+        if (strcmp(name, "") == 0)
+                return -EINVAL;
+        if (!test_opt(inode->i_sb, XATTR_USER))
+                return -EOPNOTSUPP;
+        error = permission(inode, MAY_READ, NULL);
+        if (error)
+                return error;
+
+        return ext2_xattr_get(inode, EXT2_XATTR_INDEX_USER, name, buffer, size);
+}
+
+static int
+ext2_xattr_user_set(struct inode *inode, const char *name,
+                    const void *value, size_t size, int flags)
+{
+        int error;
+
+        if (strcmp(name, "") == 0)
+                return -EINVAL;
+        if (!test_opt(inode->i_sb, XATTR_USER))
+                return -EOPNOTSUPP;
+        if ( !S_ISREG(inode->i_mode) &&
+            (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
+                return -EPERM;
+        error = permission(inode, MAY_WRITE, NULL);
+        if (error)
+                return error;
+
+        return ext2_xattr_set(inode, EXT2_XATTR_INDEX_USER, name,
+                              value, size, flags);
+}
+
+struct xattr_handler ext2_xattr_user_handler = {
+        .prefix = XATTR_USER_PREFIX,
+        .list   = ext2_xattr_user_list,
+        .get    = ext2_xattr_user_get,
+        .set    = ext2_xattr_user_set,
+};