// SPDX-License-Identifier: LGPL-2.1
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/*
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* trace/beauty/mount_flags.c
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*
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* Copyright (C) 2018, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
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*/
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#include "trace/beauty/beauty.h"
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#include <linux/compiler.h>
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#include <linux/kernel.h>
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#include <linux/log2.h>
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#include <sys/mount.h>
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static size_t mount__scnprintf_flags(unsigned long flags, char *bf, size_t size, bool show_prefix)
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{
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#include "trace/beauty/generated/mount_flags_array.c"
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static DEFINE_STRARRAY(mount_flags, "MS_");
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return strarray__scnprintf_flags(&strarray__mount_flags, bf, size, show_prefix, flags);
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}
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unsigned long syscall_arg__mask_val_mount_flags(struct syscall_arg *arg __maybe_unused, unsigned long flags)
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{
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// do_mount in fs/namespace.c:
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/*
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* Pre-0.97 versions of mount() didn't have a flags word. When the
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* flags word was introduced its top half was required to have the
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* magic value 0xC0ED, and this remained so until 2.4.0-test9.
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* Therefore, if this magic number is present, it carries no
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* information and must be discarded.
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*/
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if ((flags & MS_MGC_MSK) == MS_MGC_VAL)
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flags &= ~MS_MGC_MSK;
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return flags;
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}
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size_t syscall_arg__scnprintf_mount_flags(char *bf, size_t size, struct syscall_arg *arg)
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{
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unsigned long flags = arg->val;
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return mount__scnprintf_flags(flags, bf, size, arg->show_string_prefix);
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}
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