patch-2.1.112 linux/fs/ufs/acl.c

• Lines: 67
• Date: Sun Jul 26 01:20:22 1998
• Orig file: v2.1.111/linux/fs/ufs/acl.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.111/linux/fs/ufs/acl.c linux/fs/ufs/acl.c
@@ -0,0 +1,66 @@
+/*
+ *  linux/fs/ufs/acl.c
+ *
+ * Copyright (C) 1998
+ * Daniel Pirkl <daniel.pirkl@email.cz>
+ * Charles Uiversity, Faculty of Mathematics and Physics
+ *
+ *  from
+ *
+ *  linux/fs/ext2/acl.c
+ *
+ * Copyright (C) 1993, 1994, 1995
+ * 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/ufs_fs.h>
+#include <linux/sched.h>
+#include <linux/stat.h>
+
+/*
+ * ufs_permission ()
+ *
+ * Check for access rights
+ */
+int ufs_permission (struct inode * inode, int mask)
+{
+	unsigned short mode = inode->i_mode;
+
+	/*
+	 * Nobody gets write access to a file on a readonly-fs
+	 */
+	if ((mask & S_IWOTH) && 
+            (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) &&
+            IS_RDONLY(inode))
+		return -EROFS;
+	/*
+	 * Nobody gets write access to an immutable file
+	 */
+	if ((mask & S_IWOTH) && IS_IMMUTABLE(inode))
+		return -EACCES;
+
+	/*
+	 * 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;
+	/*
+	 * Access is always granted for root. We now check last,
+         * though, for BSD process accounting correctness
+	 */
+	if (((mode & mask & S_IRWXO) == mask) || fsuser())
+		return 0;
+	else
+		return -EACCES;
+}