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// 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);
}
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