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. $(dirname $0)/lib/probe.sh
14
15skip_if_no_perf_probe || exit 2
16skip_if_no_perf_trace || exit 2
17
18. $(dirname $0)/lib/probe_vfs_getname.sh
19
20file=$(mktemp /tmp/temporary_file.XXXXX)
21
22trace_open_vfs_getname() {
23	evts=$(echo $(perf list syscalls:sys_enter_open* 2>&1 | egrep 'open(at)? ' | sed -r 's/.*sys_enter_([a-z]+) +\[.*$/\1/') | sed 's/ /,/')
24	perf trace -e $evts touch $file 2>&1 | \
25	egrep " +[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]+$"
26}
27
28
29add_probe_vfs_getname || skip_if_no_debuginfo
30err=$?
31if [ $err -ne 0 ] ; then
32	exit $err
33fi
34
35# Do not use whatever ~/.perfconfig file, it may change the output
36# via trace.{show_timestamp,show_prefix,etc}
37export PERF_CONFIG=/dev/null
38
39trace_open_vfs_getname
40err=$?
41rm -f ${file}
42cleanup_probe_vfs_getname
43exit $err
44