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 perf trace -e open touch $file 2>&1 | \ 21 egrep " +[0-9]+\.[0-9]+ +\( +[0-9]+\.[0-9]+ ms\): +touch\/[0-9]+ open\(filename: +${file}, +flags: CREAT\|NOCTTY\|NONBLOCK\|WRONLY, +mode: +IRUGO\|IWUGO\) += +[0-9]+$" 22} 23 24 25add_probe_vfs_getname || skip_if_no_debuginfo 26err=$? 27if [ $err -ne 0 ] ; then 28 exit $err 29fi 30 31trace_open_vfs_getname 32err=$? 33rm -f ${file} 34cleanup_probe_vfs_getname 35exit $err 36