[Test] Check stack overflow in readdirp

Description: The TC checks that there is no stack overflow
             in readdirp with parallel-readdir enabled.
Steps :
1) Create a volume.
2) Mount the volume using FUSE.
3) Enable performance.parallel-readdir and
   performance.readdir-ahead on the volume.
4) Create 10000 files on the mount point.
5) Add-brick to the volume.
6) Perform fix-layout on the volume (not rebalance).
7) From client node, rename all the files, this will result in
   creation of linkto files on the newly added brick.
8) Do ls -l (lookup) on the mount-point.

Change-Id: I821efea55e3f8981ecd307b93781f2da5790c548
Signed-off-by: sayaleeraut <saraut@redhat.com>

1 files changed, 131 insertions, 0 deletions

diff --git a/tests/functional/dht/test_stack_overflow.py b/tests/functional/dht/test_stack_overflow.py
new file mode 100644
index 000000000..b165bdf65
--- /dev/null
+++ b/tests/functional/dht/test_stack_overflow.py
@@ -0,0 +1,131 @@
+#  Copyright (C) 2020 Red Hat, Inc. <http://www.redhat.com>
+#
+#  This program is free software; you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation; either version 2 of the License, or
+#  any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License along
+#  with this program; if not, write to the Free Software Foundation, Inc.,
+#  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+from glusto.core import Glusto as g
+from glustolibs.gluster.exceptions import ExecutionError
+from glustolibs.gluster.gluster_base_class import GlusterBaseClass, runs_on
+from glustolibs.gluster.volume_ops import (set_volume_options,
+                                           reset_volume_option)
+from glustolibs.gluster.volume_libs import expand_volume
+from glustolibs.gluster.rebalance_ops import (rebalance_start,
+                                              wait_for_fix_layout_to_complete)
+from glustolibs.gluster.glusterfile import move_file
+
+
+@runs_on([['distributed', 'distributed-replicated',
+           'dispersed', 'distributed-dispersed', 'replicated',
+           'arbiter', 'distributed-arbiter'],
+          ['glusterfs']])
+class TestStackOverflow(GlusterBaseClass):
+    def setUp(self):
+        """
+        Setup and mount volume or raise ExecutionError
+        """
+        self.get_super_method(self, 'setUp')()
+
+        # Setup Volume
+        ret = self.setup_volume_and_mount_volume([self.mounts[0]])
+        if not ret:
+            g.log.error("Failed to Setup and Mount Volume")
+            raise ExecutionError("Failed to Setup and Mount Volume")
+
+    def tearDown(self):
+        # Reset the volume options set inside the test
+        vol_options = ['performance.parallel-readdir',
+                       'performance.readdir-ahead']
+        for opt in vol_options:
+            ret, _, _ = reset_volume_option(self.mnode, self.volname, opt)
+            if ret:
+                raise ExecutionError("Failed to reset the volume option %s"
+                                     % opt)
+        g.log.info("Successfully reset the volume options")
+
+        # Unmount and cleanup original volume
+        ret = self.unmount_volume_and_cleanup_volume(mounts=[self.mounts[0]])
+        if not ret:
+            raise ExecutionError("Failed to umount the vol & cleanup Volume")
+        g.log.info("Successful in umounting the volume and Cleanup")
+
+        # Calling GlusterBaseClass tearDown
+        self.get_super_method(self, 'tearDown')()
+
+    def test_stack_overflow(self):
+        """
+        Description: Tests to check that there is no stack overflow
+                     in readdirp with parallel-readdir enabled.
+        Steps :
+        1) Create a volume.
+        2) Mount the volume using FUSE.
+        3) Enable performance.parallel-readdir and
+           performance.readdir-ahead on the volume.
+        4) Create 10000 files on the mount point.
+        5) Add-brick to the volume.
+        6) Perform fix-layout on the volume (not rebalance).
+        7) From client node, rename all the files, this will result in creation
+           of linkto files on the newly added brick.
+        8) Do ls -l (lookup) on the mount-point.
+        """
+        # pylint: disable=too-many-statements
+        # Enable performance.parallel-readdir and
+        # performance.readdir-ahead on the volume
+        options = {"performance.parallel-readdir": "enable",
+                   "performance.readdir-ahead": "enable"}
+        ret = set_volume_options(self.mnode, self.volname, options)
+        self.assertTrue(ret, "Failed to set volume options")
+        g.log.info("Successfully set volume options")
+
+        # Creating 10000 files on volume root
+        m_point = self.mounts[0].mountpoint
+        command = 'touch ' + m_point + '/file{1..10000}_0'
+        ret, _, _ = g.run(self.clients[0], command)
+        self.assertEqual(ret, 0, "File creation failed on %s"
+                         % m_point)
+        g.log.info("Files successfully created on the mount point")
+
+        # Add bricks to the volume
+        ret = expand_volume(self.mnode, self.volname, self.servers,
+                            self.all_servers_info)
+        self.assertTrue(ret, ("Failed to expand the volume %s",
+                              self.volname))
+        g.log.info("Expanding volume is successful on "
+                   "volume %s", self.volname)
+
+        # Perform fix-layout on the volume
+        ret, _, _ = rebalance_start(self.mnode, self.volname, fix_layout=True)
+        self.assertEqual(ret, 0, 'Failed to start rebalance')
+        g.log.info('Rebalance is started')
+
+        # Wait for fix-layout to complete
+        ret = wait_for_fix_layout_to_complete(self.mnode, self.volname,
+                                              timeout=300)
+        self.assertTrue(ret, ("Fix-layout failed on volume %s",
+                              self.volname))
+        g.log.info("Fix-layout is successful on "
+                   "volume %s", self.volname)
+
+        # Rename all files from client node
+        for i in range(1, 10000):
+            ret = move_file(self.clients[0],
+                            '{}/file{}_0'.format(m_point, i),
+                            '{}/file{}_1'.format(m_point, i))
+            self.assertTrue(ret, "Failed to rename files")
+        g.log.info("Files renamed successfully")
+
+        # Perform lookup from the mount-point
+        cmd = "ls -lR " + m_point
+        ret, _, _ = g.run(self.mounts[0].client_system, cmd)
+        self.assertEqual(ret, 0, "Failed to lookup")
+        g.log.info("Lookup successful")