summaryrefslogtreecommitdiffstats
path: root/tools/perf/trace/beauty/mount_flags.c
diff options
context:
space:
mode:
Diffstat (limited to 'tools/perf/trace/beauty/mount_flags.c')
-rw-r--r--tools/perf/trace/beauty/mount_flags.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/tools/perf/trace/beauty/mount_flags.c b/tools/perf/trace/beauty/mount_flags.c
new file mode 100644
index 000000000..10fb14cfa
--- /dev/null
+++ b/tools/perf/trace/beauty/mount_flags.c
@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: LGPL-2.1
+/*
+ * trace/beauty/mount_flags.c
+ *
+ * Copyright (C) 2018, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
+ */
+
+#include "trace/beauty/beauty.h"
+#include <linux/compiler.h>
+#include <linux/kernel.h>
+#include <linux/log2.h>
+#include <sys/mount.h>
+
+static size_t mount__scnprintf_flags(unsigned long flags, char *bf, size_t size, bool show_prefix)
+{
+#include "trace/beauty/generated/mount_flags_array.c"
+ static DEFINE_STRARRAY(mount_flags, "MS_");
+
+ return strarray__scnprintf_flags(&strarray__mount_flags, bf, size, show_prefix, flags);
+}
+
+unsigned long syscall_arg__mask_val_mount_flags(struct syscall_arg *arg __maybe_unused, unsigned long flags)
+{
+ // do_mount in fs/namespace.c:
+ /*
+ * Pre-0.97 versions of mount() didn't have a flags word. When the
+ * flags word was introduced its top half was required to have the
+ * magic value 0xC0ED, and this remained so until 2.4.0-test9.
+ * Therefore, if this magic number is present, it carries no
+ * information and must be discarded.
+ */
+ if ((flags & MS_MGC_MSK) == MS_MGC_VAL)
+ flags &= ~MS_MGC_MSK;
+
+ return flags;
+}
+
+size_t syscall_arg__scnprintf_mount_flags(char *bf, size_t size, struct syscall_arg *arg)
+{
+ unsigned long flags = arg->val;
+
+ return mount__scnprintf_flags(flags, bf, size, arg->show_string_prefix);
+}