Import of Linus's Linux 1.1.68

1 files changed, 50 insertions, 0 deletions

diff --git a/fs/ext2/acl.c b/fs/ext2/acl.c
new file mode 100644
index 000000000..91ef7c8cc
--- /dev/null
+++ b/fs/ext2/acl.c
@@ -0,0 +1,50 @@
+/*
+ * linux/fs/ext2/acl.c
+ *
+ * Copyright (C) 1993, 1994  Remy Card (card@masi.ibp.fr)
+ *                           Laboratoire MASI - Institut Blaise Pascal
+ *                           Universite Pierre et Marie Curie (Paris VI)
+ */
+
+/*
+ * This file will contain the Access Control Lists management for the
+ * second extended file system.
+ */
+
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/ext2_fs.h>
+#include <linux/sched.h>
+#include <linux/stat.h>
+
+/*
+ * ext2_permission ()
+ *
+ * Check for access rights
+ */
+int ext2_permission (struct inode * inode, int mask)
+{
+	unsigned short mode = inode->i_mode;
+
+	/*
+	 * Nobody gets write access to an immutable file
+	 */
+	if ((mask & S_IWOTH) && IS_IMMUTABLE(inode))
+		return 0;
+	/*
+	 * Special case, access is always granted for root
+	 */
+	if (fsuser())
+		return 1;
+	/*
+	 * If no ACL, checks using the file mode
+	 */
+	else if (current->fsuid == inode->i_uid)
+		mode >>= 6;
+	else if (in_group_p (inode->i_gid))
+		mode >>= 3;
+	if (((mode & mask & S_IRWXO) == mask))
+		return 1;
+	else
+		return 0;
+}