1# Check open filename arg using perf trace + vfs_getname
2
3# Uses the 'perf test shell' library to add probe:vfs_getname to the system
4# then use it with 'perf trace' using 'touch' to write to a temp file, then
5# checks that that was captured by the vfs_getname was used by 'perf trace',
6# that already handles "probe:vfs_getname" if present, and used in the
7# "open" syscall "filename" argument beautifier.
8
9# Arnaldo Carvalho de Melo <acme@kernel.org>, 2017
10
11. $(dirname $0)/lib/probe.sh
12
13skip_if_no_perf_probe || exit 2
14
15. $(dirname $0)/lib/probe_vfs_getname.sh
16
17file=$(mktemp /tmp/temporary_file.XXXXX)
18
19trace_open_vfs_getname() {
20	test "$(uname -m)" = s390x && { svc="openat"; txt="dfd: +CWD, +"; }
21
22	perf trace -e ${svc:-open} touch $file 2>&1 | \
23	egrep " +[0-9]+\.[0-9]+ +\( +[0-9]+\.[0-9]+ ms\): +touch\/[0-9]+ ${svc:-open}\(${txt}filename: +${file}, +flags: CREAT\|NOCTTY\|NONBLOCK\|WRONLY, +mode: +IRUGO\|IWUGO\) += +[0-9]+$"
24}
25
26
27add_probe_vfs_getname || skip_if_no_debuginfo
28err=$?
29if [ $err -ne 0 ] ; then
30	exit $err
31fi
32
33trace_open_vfs_getname
34err=$?
35rm -f ${file}
36cleanup_probe_vfs_getname
37exit $err
38