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 evts=$(echo $(perf list syscalls:sys_enter_open* |& egrep 'open(at)? ' | sed -r 's/.*sys_enter_([a-z]+) +\[.*$/\1/') | sed 's/ /,/') 21 perf trace -e $evts touch $file 2>&1 | \ 22 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]+$" 23} 24 25 26add_probe_vfs_getname || skip_if_no_debuginfo 27err=$? 28if [ $err -ne 0 ] ; then 29 exit $err 30fi 31 32trace_open_vfs_getname 33err=$? 34rm -f ${file} 35cleanup_probe_vfs_getname 36exit $err 37