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1// SPDX-License-Identifier: LGPL-2.12/*3 * trace/beauty/mount_flags.c4 *5 * Copyright (C) 2018, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>6 */7 8#include "trace/beauty/beauty.h"9#include <linux/compiler.h>10#include <linux/kernel.h>11#include <linux/log2.h>12#include <sys/mount.h>13 14static size_t mount__scnprintf_flags(unsigned long flags, char *bf, size_t size, bool show_prefix)15{16#include "trace/beauty/generated/mount_flags_array.c"17 static DEFINE_STRARRAY(mount_flags, "MS_");18 19 return strarray__scnprintf_flags(&strarray__mount_flags, bf, size, show_prefix, flags);20}21 22unsigned long syscall_arg__mask_val_mount_flags(struct syscall_arg *arg __maybe_unused, unsigned long flags)23{24 // do_mount in fs/namespace.c:25 /*26 * Pre-0.97 versions of mount() didn't have a flags word. When the27 * flags word was introduced its top half was required to have the28 * magic value 0xC0ED, and this remained so until 2.4.0-test9.29 * Therefore, if this magic number is present, it carries no30 * information and must be discarded.31 */32 if ((flags & MS_MGC_MSK) == MS_MGC_VAL)33 flags &= ~MS_MGC_MSK;34 35 return flags;36}37 38size_t syscall_arg__scnprintf_mount_flags(char *bf, size_t size, struct syscall_arg *arg)39{40 unsigned long flags = arg->val;41 42 return mount__scnprintf_flags(flags, bf, size, arg->show_string_prefix);43}44