linux/tools/perf/tests/shell/lib/probe_vfs_getname.sh

#!/bin/bash
# Arnaldo Carvalho de Melo <acme@kernel.org>, 2017

perf probe -l 2>&1 | grep -q probe:vfs_getname
had_vfs_getname=$?

cleanup_probe_vfs_getname() {
	if [ $had_vfs_getname -eq 1 ] ; then
		perf probe -q -d probe:vfs_getname*
	fi
}

add_probe_vfs_getname() {
	add_probe_verbose=$1
	if [ $had_vfs_getname -eq 1 ] ; then
		result_initname_re="[[:space:]]+([[:digit:]]+)[[:space:]]+initname.*"
		line=$(perf probe -L getname_flags 2>&1 | grep -E "$result_initname_re" | sed -r "s/$result_initname_re/\1/")

		# Search the old regular expressions so that this will
		# pass on older kernels as well.
		if [ -z "$line" ] ; then
			result_filename_re="[[:space:]]+([[:digit:]]+)[[:space:]]+result->uptr.*"
			line=$(perf probe -L getname_flags 2>&1 | grep -E "$result_filename_re" | sed -r "s/$result_filename_re/\1/")
		fi

		if [ -z "$line" ] ; then
			result_aname_re="[[:space:]]+([[:digit:]]+)[[:space:]]+result->aname = NULL;"
			line=$(perf probe -L getname_flags 2>&1 | grep -E "$result_aname_re" | sed -r "s/$result_aname_re/\1/")
		fi

		if [ -z "$line" ] ; then
			echo "Could not find probeable line"
			return 2
		fi

		perf probe -q       "vfs_getname=getname_flags:${line} pathname=result->name:string" || \
		perf probe $add_probe_verbose "vfs_getname=getname_flags:${line} pathname=filename:ustring" || return 1
	fi
}

skip_if_no_debuginfo() {
	add_probe_vfs_getname -v 2>&1 | grep -E -q "^(Failed to find the path for the kernel|Debuginfo-analysis is not supported)|(file has no debug information)" && return 2
	return 1
}

# check if perf is compiled with libtraceevent support
skip_no_probe_record_support() {
	if [ $had_vfs_getname -eq 1 ] ; then
		perf check feature -q libtraceevent && return 1
		return 2
	fi
}