xfstests: 310 fails with existing directory error

Test 310 fails with:

mkdir: cannot create directory `/mnt/test/tmp': File exists

$TEST_DIR is persistent, so test directories need to be created with
"mkdir -p" so they don't fail if the directory already exists.

Many other things need fixing, too.
	- Tests should define directories they use on $TEST_DIR by
	  their sequence number, not generic names.

	- Use a variable for the directory the test runs in
	  ($SEQ_DIR, in this case) to avoid having to manually code
	  it everywhere.

	- New binaries need to be added to .gitignore.

	- Return status for shell functions is 0 for success,
	  non-zero for failure.

	- Setting status=0 if there is no failure in the first test
	  means that even if the second test fails, the test will
	  still pass. Change the test to use "_fatal" when a kernel
	  bug is detected, and only set status=0 when the entire
	  test has finished.

	- reduce the default runtime by to roughly a minute and
	  scale it with the stress load factor variables. In most
	  cases, this test is never going to hit problems (as
	  they've already been fixed) so running it for ~4 minutes
	  is mostly a waste of time...

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Rich Johnston <rjohnston@sgi.com>
Signed-off-by: Rich Johnston <rjohnston@sgi.com>

.gitignore

@@ -67,6 +67,8 @@
 /src/preallo_rw_pattern_writer
 /src/pwrite_mmap_blocked
 /src/randholes
+/src/t_readdir_1
+/src/t_readdir_2
 /src/rename
 /src/resvtest
 /src/runas

tests/generic/310

@@ -75,12 +75,11 @@ check_kernel_bug()
 	new_warning=`dmesg | grep -c "^WARNING"`
 	new_lockdep=`dmesg | grep -c "possible recursive locking detected"`
 
-
 	# no kernel bug is detected
 	if [ $new_bug -eq $nr_bug -a $new_error -eq $nr_error -a \
 	     $new_null -eq $nr_null -a $new_warning -eq $nr_warning -a \
 	     $new_lockdep -eq $nr_lockdep ]; then
-		return 1
+		return 0
 	fi
 
 	nr_bug=$new_bug
@@ -88,37 +87,36 @@ check_kernel_bug()
 	nr_null=$new_null
 	nr_warning=$new_warning
 	nr_lockdep=$new_lockdep
+	return 1
 }
-mkdir $TEST_DIR/tmp
+
+RUN_TIME=$((30 * $TIME_FACTOR))
+
+SEQ_DIR=$TEST_DIR/$seq
+mkdir -p $SEQ_DIR
 for n in {1..4096}; do
-	touch $TEST_DIR/tmp/$n
+	touch $SEQ_DIR/$n
 done
 
 _test_read()
 {
-	src/t_readdir_1 $TEST_DIR/tmp &
-	sleep 100
+	src/t_readdir_1 $SEQ_DIR &
+	sleep $RUN_TIME
 	killall src/t_readdir_1
 	check_kernel_bug
-	if [ $? -eq 1 ]; then
-		status=0
-	else
-		echo "error: kernel bug was found, you can see the
-			dmesg for more infomation."
+	if [ $? -ne 0 ]; then
+		_fatal "kernel bug detected, check dmesg for more infomation."
 	fi
 }
 
 _test_lseek()
 {
-	src/t_readdir_2 $TEST_DIR/tmp &
-	sleep 100
+	src/t_readdir_2 $SEQ_DIR &
+	sleep $RUN_TIME
 	killall src/t_readdir_2
 	check_kernel_bug
-	if [ $? -eq 1 ]; then
-		status=0
-	else
-		echo "error: kernel bug was found, you can see the
-			dmesg for more infomation."
+	if [ $? -ne 0 ]; then
+		_fatal "kernel bug detected, check dmesg for more infomation."
 	fi
 }
 
@@ -127,4 +125,5 @@ _test_lseek
 
 # success, all done
 echo "*** done"
+status=0
 exit