1#!/bin/sh
2# Check open filename arg using perf trace + vfs_getname
3
4# Uses the 'perf test shell' library to add probe:vfs_getname to the system
5# then use it with 'perf trace' using 'touch' to write to a temp file, then
6# checks that that was captured by the vfs_getname was used by 'perf trace',
7# that already handles "probe:vfs_getname" if present, and used in the
8# "open" syscall "filename" argument beautifier.
9
10# SPDX-License-Identifier: GPL-2.0
11# Arnaldo Carvalho de Melo <acme@kernel.org>, 2017
12
13# shellcheck source=lib/probe.sh
14. "$(dirname $0)"/lib/probe.sh
15
16skip_if_no_perf_probe || exit 2
17skip_if_no_perf_trace || exit 2
18
19. "$(dirname $0)"/lib/probe_vfs_getname.sh
20
21trace_open_vfs_getname() {
22	evts="$(echo "$(perf list syscalls:sys_enter_open* 2>/dev/null | grep -E 'open(at)? ' | sed -r 's/.*sys_enter_([a-z]+) +\[.*$/\1/')" | sed ':a;N;s:\n:,:g')"
23	perf trace -e $evts touch $file 2>&1 | \
24	grep -E " +[0-9]+\.[0-9]+ +\( +[0-9]+\.[0-9]+ ms\): +touch/[0-9]+ open(at)?\((dfd: +CWD, +)?filename: +\"?${file}\"?, +flags: CREAT\|NOCTTY\|NONBLOCK\|WRONLY, +mode: +IRUGO\|IWUGO\) += +[0-9]+$"
25}
26
27
28add_probe_vfs_getname || skip_if_no_debuginfo
29err=$?
30if [ $err -ne 0 ] ; then
31	exit $err
32fi
33
34file=$(mktemp /tmp/temporary_file.XXXXX)
35
36# Do not use whatever ~/.perfconfig file, it may change the output
37# via trace.{show_timestamp,show_prefix,etc}
38export PERF_CONFIG=/dev/null
39
40trace_open_vfs_getname
41err=$?
42rm -f ${file}
43cleanup_probe_vfs_getname
44exit $err
45