[PATCH 1/1] selftests : Adding symbolic link limits test script

[Fabian Frederick]

This patch adds fs directory in selftests and a script to explain recursive
and consecutive symbolic linking limits who have been debated
so many times.

Signed-off-by: Fabian Frederick <fabf@xxxxxxxxx>
---
 tools/testing/selftests/Makefile       |  1 +
 tools/testing/selftests/fs/Makefile    |  6 ++++
 tools/testing/selftests/fs/symlinks.sh | 64 ++++++++++++++++++++++++++++++++++
 3 files changed, 71 insertions(+)
 create mode 100644 tools/testing/selftests/fs/Makefile
 create mode 100755 tools/testing/selftests/fs/symlinks.sh

diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index 9f3eae2..10e2d80 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -9,6 +9,7 @@ TARGETS += ptrace
 TARGETS += timers
 TARGETS += vm
 TARGETS += powerpc
+TARGETS += fs
 
 all:
 	for TARGET in $(TARGETS); do \
diff --git a/tools/testing/selftests/fs/Makefile b/tools/testing/selftests/fs/Makefile
new file mode 100644
index 0000000..cf0fc21
--- /dev/null
+++ b/tools/testing/selftests/fs/Makefile
@@ -0,0 +1,6 @@
+all:
+
+run_tests:
+	@/bin/sh ./symlinks.sh || echo "symlinks selftests: [FAIL]"
+
+clean:
diff --git a/tools/testing/selftests/fs/symlinks.sh b/tools/testing/selftests/fs/symlinks.sh
new file mode 100755
index 0000000..5daeb05
--- /dev/null
+++ b/tools/testing/selftests/fs/symlinks.sh
@@ -0,0 +1,64 @@
+#!/bin/bash
+#
+# This script hits symbolic link limits.
+
+boldtext=`tput bold`
+normaltext=`tput sgr0`
+run_path=`pwd`
+appl_path="tmp_symlinks"
+mkdir -p $appl_path
+cd $appl_path
+
+function recursive_symbolic_links()
+{
+	path="origpath"`date +'%s'`
+	symlink=`date +'%s'`
+	echo $boldtext"Recursive symbolic link testing (vfs limit : 8)"\
+	     $normaltext
+	echo "original_path/1/2/3/4 ...  where 1=>original_path 2=>1 ..."
+	echo "Trying 10 steps ..."
+	mkdir $path
+
+	for i in {1..10}
+	do
+		cd $path 2>/dev/null|| break
+		echo  "Creating : "$path" =>" " [OK]"
+		if [ $i = 1 ] ;then
+			path="../"$path
+		fi
+		ln -s $path $symlink"_"$i
+		path=$symlink"_"$i
+	done
+	echo $boldtext"Maximum recursive symlink level:" `expr $i - 2 `\
+	     $normaltext
+}
+
+function consecutive_symbolic_links()
+{
+	origfile="orig"`date +'%s'`
+	symlink=`date +'%s'`
+	echo $boldtext"Consecutive symbolic link testing (vfs limit : 40)"\
+	     $normaltext
+	echo "original_file;1;2;3 ... where 1=>original_file 2=>1 ..."
+	echo "Trying 50 steps ..."
+
+	touch $origfile
+	for i in {1..50}
+	do
+		cat $origfile 2>/dev/null || break;
+		echo -n "[OK] |"
+		ln -s $origfile $symlink"_"$i
+		origfile=$symlink"_"$i
+		echo -n $i
+	done
+	echo -e $boldtext "\nMaximum consecutive symlink level:" `expr $i - 2`\
+	        $normaltext
+
+}
+
+recursive_symbolic_links
+echo "------------------------------------------------------"
+sleep 1
+consecutive_symbolic_links
+cd $run_path
+rm -rf $appl_path
-- 
1.8.1.4
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