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43 lines
1.3 KiB
43 lines
1.3 KiB
// 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 <[email protected]> |
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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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