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#  Copyright (C) 2016-2017  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.

""" Description:
        Test Cases in this module tests the client side quorum.
"""


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_libs import (
    set_volume_options, get_volume_options, get_subvols,
    setup_volume, cleanup_volume)
from glustolibs.gluster.volume_ops import get_volume_list
from glustolibs.misc.misc_libs import upload_scripts
from glustolibs.gluster.brick_libs import (bring_bricks_offline,
                                           get_all_bricks,
                                           are_bricks_offline)
from glustolibs.io.utils import (validate_io_procs,
                                 is_io_procs_fail_with_rofs,
                                 list_all_files_and_dirs_mounts,
                                 wait_for_io_to_complete
                                 )
from glustolibs.gluster.mount_ops import mount_volume, umount_volume
import tempfile


@runs_on([['replicated', 'distributed-replicated'],
          ['glusterfs', 'nfs', 'cifs']])
class ClientSideQuorumTests(GlusterBaseClass):
    """
    ClientSideQuorumTests contains tests which verifies the
    client side quorum Test Cases
    """
    @classmethod
    def setUpClass(cls):
        """
        Upload the necessary scripts to run tests.
        """

        # calling GlusterBaseClass setUpClass
        GlusterBaseClass.setUpClass.im_func(cls)

        # Upload io scripts for running IO on mounts
        g.log.info("Upload io scripts to clients %s for running IO on "
                   "mounts", cls.clients)
        script_abs_path = "/usr/share/glustolibs/io/scripts/file_dir_ops.py"
        cls.script_upload_path = "/usr/share/glustolibs/io/scripts/" \
                                 "file_dir_ops.py"
        ret = upload_scripts(cls.clients, script_abs_path)
        if not ret:
            raise ExecutionError("Failed to upload IO scripts to clients")

    def setUp(self):
        """
        setUp method for every test
        """

        # calling GlusterBaseClass setUp
        GlusterBaseClass.setUp.im_func(self)

        # Setup Volume and Mount Volume
        g.log.info("Starting to Setup Volume %s" % self.volname)
        ret = self.setup_volume_and_mount_volume(self.mounts)
        if not ret:
            raise ExecutionError("Failed to Setup_Volume and Mount_Volume")
        g.log.info("Successful in Setup Volume and Mount Volume")

    def tearDown(self):
        """
        tearDown for every test
        """

        # stopping the volume
        g.log.info("Starting to Unmount Volume and Cleanup Volume")
        ret = self.unmount_volume_and_cleanup_volume(mounts=self.mounts)
        if not ret:
            raise ExecutionError("Failed to Unmount Volume and Cleanup Volume")
        g.log.info("Successful in Unmount Volume and Cleanup Volume")

        # Calling GlusterBaseClass tearDown
        GlusterBaseClass.tearDown.im_func(self)

    def test_client_side_quorum_with_auto_option(self):
        """
        Test Script to verify the Client Side Quorum with auto option

        * set cluster.quorum-type to auto.
        * start I/O from the mount point.
        * kill 2 of the brick process from the each and every replica set
        * perform ops

        """
        # set cluster.quorum-type to auto
        options = {"cluster.quorum-type": "auto"}
        g.log.info("setting cluster.quorum-type to auto on "
                   "volume %s" % self.volname)
        ret = set_volume_options(self.mnode, self.volname, options)
        self.assertTrue(ret, ("Unable to set volume option %s for"
                              "volume %s" % (options, self.volname)))
        g.log.info("Sucessfully set %s for volume %s"
                   % (options, self.volname))

        # write files on all mounts
        g.log.info("Starting IO on all mounts...")
        g.log.info("mounts: %s" % self.mounts)
        all_mounts_procs = []
        for mount_obj in self.mounts:
            cmd = ("python %s create_files "
                   "-f 10 --base-file-name file %s" % (self.script_upload_path,
                                                       mount_obj.mountpoint))
            proc = g.run_async(mount_obj.client_system, cmd,
                               user=mount_obj.user)
            all_mounts_procs.append(proc)

        # Validate IO
        g.log.info("Validating IO on mounts")
        ret = validate_io_procs(all_mounts_procs, self.mounts)
        self.assertTrue(ret, "IO failed on some of the clients")
        g.log.info("IO is successful on all mounts")

        # get the subvolumes
        g.log.info("Starting to get sub-volumes for volume %s" % self.volname)
        subvols_dict = get_subvols(self.mnode, self.volname)
        num_subvols = len(subvols_dict['volume_subvols'])
        g.log.info("Number of subvolumes in volume %s:" % num_subvols)

        # bring bricks offline( 2 bricks ) for all the subvolumes
        for i in range(0, num_subvols):
            subvol_brick_list = subvols_dict['volume_subvols'][i]
            g.log.info("sub-volume %s brick list : %s"
                       % (i, subvol_brick_list))
            # For volume type: 1 * 2, bring 1 brick offline
            if len(subvol_brick_list) == 2:
                bricks_to_bring_offline = subvol_brick_list[0:1]
            else:
                bricks_to_bring_offline = subvol_brick_list[0:2]
            g.log.info("Going to bring down the brick process "
                       "for %s" % bricks_to_bring_offline)
            ret = bring_bricks_offline(self.volname, bricks_to_bring_offline)
            self.assertTrue(ret, ("Failed to bring down the bricks. Please "
                                  "check the log file for more details."))
            g.log.info("Brought down the brick process "
                       "for %s succesfully" % bricks_to_bring_offline)

        # create 2 files named newfile0.txt and newfile1.txt
        g.log.info("Start creating 2 files on all mounts...")
        all_mounts_procs = []
        for mount_obj in self.mounts:
            cmd = ("python %s create_files "
                   "-f 2 --base-file-name newfile %s" %
                   (self.script_upload_path, mount_obj.mountpoint))
            proc = g.run_async(mount_obj.client_system, cmd,
                               user=mount_obj.user)
            all_mounts_procs.append(proc)

        # Validate IO
        g.log.info("Validating whether IO failed with read-only filesystem")
        ret = is_io_procs_fail_with_rofs(self, all_mounts_procs, self.mounts)
        self.assertTrue(ret, ("Unexpected error and IO successfull"
                              " on read-only filesystem"))
        g.log.info("EXPECTED: Read-only file system in IO while creating file")

        # create directory user1
        g.log.info("Start creating directory on all mounts...")
        all_mounts_procs = []
        for mount_obj in self.mounts:
            cmd = ("python %s create_deep_dir "
                   "%s" % (self.script_upload_path, mount_obj.mountpoint))
            proc = g.run_async(mount_obj.client_system, cmd,
                               user=mount_obj.user)
            all_mounts_procs.append(proc)

        # Validate IO
        g.log.info("Validating whether IO failed with read-only filesystem")
        ret = is_io_procs_fail_with_rofs(self, all_mounts_procs, self.mounts)
        self.assertTrue(ret, ("Unexpected error and IO successfull"
                              " on read-only filesystem"))
        g.log.info("EXPECTED: Read-only file system in IO while"
                   " creating directory")

        # create h/w link to file
        g.log.info("Start creating hard link for file0.txt on all mounts")
        for mount_obj in self.mounts:
            cmd = "ln %s/file0.txt %s/file0.txt_hwlink" \
                  % (mount_obj.mountpoint, mount_obj.mountpoint)
            ret, out, err = g.run(mount_obj.client_system, cmd)
            self.assertTrue(ret, ("Unexpected error and creating hard link"
                                  " successful on read-only filesystem"))
            self.assertIn("Read-only file system",
                          err, "Read-only filesystem not found in "
                               "IO while truncating file")
            g.log.info("EXPECTED: Read-only file system in IO")

        # create s/w link
        g.log.info("Start creating soft link for file1.txt on all mounts")
        for mount_obj in self.mounts:
            cmd = "ln -s %s/file1.txt %s/file1.txt_swlink" %\
                  (mount_obj.mountpoint, mount_obj.mountpoint)
            ret, out, err = g.run(mount_obj.client_system, cmd)
            self.assertTrue(ret, ("Unexpected error and creating soft link"
                                  " successful on read-only filesystem"))
            self.assertIn("Read-only file system",
                          err, "Read-only filesystem not found in "
                               "IO while truncating file")
            g.log.info("EXPECTED: Read-only file system in IO")

        # append to file
        g.log.info("Appending to file1.txt on all mounts")
        for mount_obj in self.mounts:
            cmd = "cat %s/file0.txt >> %s/file1.txt" %\
                  (mount_obj.mountpoint, mount_obj.mountpoint)
            ret, out, err = g.run(mount_obj.client_system, cmd)
            self.assertTrue(ret, ("Unexpected error and append successful"
                                  " on read-only filesystem"))
            self.assertIn("Read-only file system",
                          err, "Read-only filesystem not found in "
                               "IO while truncating file")
            g.log.info("EXPECTED: Read-only file system in IO")

        # modify the file
        g.log.info("Modifying file1.txt on all mounts")
        for mount_obj in self.mounts:
            cmd = "echo 'Modify Contents' > %s/file1.txt"\
                  % (mount_obj.mountpoint)
            ret, out, err = g.run(mount_obj.client_system, cmd)
            self.assertTrue(ret, ("Unexpected error and modifying successful"
                                  " on read-only filesystem"))
            self.assertIn("Read-only file system",
                          err, "Read-only filesystem not found in "
                               "IO while truncating file")
            g.log.info("EXPECTED: Read-only file system in IO")

        # truncate the file
        g.log.info("Truncating file1.txt on all mounts")
        for mount_obj in self.mounts:
            cmd = "truncate -s 0 %s/file1.txt" % (mount_obj.mountpoint)
            ret, out, err = g.run(mount_obj.client_system, cmd)
            self.assertTrue(ret, ("Unexpected error and truncating file"
                                  " successful on read-only filesystem"))
            self.assertIn("Read-only file system",
                          err, "Read-only filesystem not found in "
                               "IO while truncating file")
            g.log.info("EXPECTED: Read-only file system in IO")

        # read the file
        g.log.info("Starting reading files on all mounts")
        all_mounts_procs = []
        for mount_obj in self.mounts:
            cmd = ("python %s read "
                   "%s" % (self.script_upload_path, mount_obj.mountpoint))
            proc = g.run_async(mount_obj.client_system, cmd,
                               user=mount_obj.user)
            all_mounts_procs.append(proc)

        # Validate IO
        g.log.info("validating IO on all mounts")
        ret = validate_io_procs(all_mounts_procs, self.mounts)
        self.assertTrue(ret, "Reads failed on some of the clients")
        g.log.info("Reads successful on all mounts")

        # stat on file
        g.log.info("stat on file1.txt on all mounts")
        for mount_obj in self.mounts:
            cmd = "stat %s/file1.txt" % (mount_obj.mountpoint)
            ret, out, err = g.run(mount_obj.client_system, cmd)
            self.assertFalse(ret, ("Unexpected error and stat on file fails"
                                   " on read-only filesystem"))
            g.log.info("stat on file is successfull on read-only filesystem")

        # stat on dir
        g.log.info("stat on directory on all mounts")
        for mount_obj in self.mounts:
            cmd = ("python %s stat %s"
                   % (self.script_upload_path, mount_obj.mountpoint))
            ret, out, err = g.run(mount_obj.client_system, cmd)
            self.assertFalse(ret, ("Unexpected error and stat on directory"
                                   " fails on read-only filesystem"))
            g.log.info("stat on dir is successfull on read-only filesystem")

        # ls on mount point
        g.log.info("ls on mount point on all mounts")
        for mount_obj in self.mounts:
            cmd = ("python %s ls %s"
                   % (self.script_upload_path, mount_obj.mountpoint))
            ret, out, err = g.run(mount_obj.client_system, cmd)
            self.assertFalse(ret, ("Unexpected error and listing file fails"
                                   " on read-only filesystem"))
            g.log.info("listing files is successfull on read-only filesystem")

    def test_client_side_quorum_with_fixed_validate_max_bricks(self):
        """
        Test Script with Client Side Quorum with fixed should validate
        maximum number of bricks to accept

        * set cluster quorum to fixed
        * set cluster.quorum-count to higher number which is greater than
          number of replicas in a sub-voulme
        * Above step should fail

        """

        # set cluster.quorum-type to fixed
        options = {"cluster.quorum-type": "fixed"}
        g.log.info("setting %s for the volume %s" % (options, self.volname))
        ret = set_volume_options(self.mnode, self.volname, options)
        self.assertTrue(ret, ("Unable to set %s for volume %s"
                              % (options, self.volname)))
        g.log.info("Successfully set %s for volume %s"
                   % (options, self.volname))

        # get the subvolumes
        g.log.info("Starting to get sub-volumes for volume %s" % self.volname)
        subvols_dict = get_subvols(self.mnode, self.volname)
        num_subvols = len(subvols_dict['volume_subvols'])
        g.log.info("Number of subvolumes in volume %s is %s"
                   % (self.volname, num_subvols))

        # get the number of bricks in replica set
        num_bricks_in_subvol = len(subvols_dict['volume_subvols'][0])
        g.log.info("Number of bricks in each replica set : %s"
                   % num_bricks_in_subvol)

        # set cluster.quorum-count to higher value than the number of bricks in
        # repliac set
        start_range = num_bricks_in_subvol + 1
        end_range = num_bricks_in_subvol + 30
        for i in range(start_range, end_range):
            options = {"cluster.quorum-count": "%s" % start_range}
            g.log.info("setting %s for the volume %s" %
                       (options, self.volname))
            ret = set_volume_options(self.mnode, self.volname, options)
            self.assertFalse(ret, ("Able to set %s for volume %s, quorum-count"
                                   " should not be greater than number of"
                                   " bricks in replica set"
                                   % (options, self.volname)))
        g.log.info("Expected: Unable to set %s for volume %s, "
                   "quorum-count should be less than number of bricks "
                   "in replica set" % (options, self.volname))


@runs_on([['distributed-replicated'],
          ['glusterfs']])
class ClientSideQuorumTestsMultipleVols(GlusterBaseClass):

    @classmethod
    def setUpClass(cls):
        # Calling GlusterBaseClass setUpClass
        GlusterBaseClass.setUpClass.im_func(cls)

        # Upload io scripts for running IO on mounts
        g.log.info("Upload io scripts to clients %s for running IO on mounts"
                   % cls.clients)
        script_local_path = ("/usr/share/glustolibs/io/scripts/"
                             "file_dir_ops.py")
        cls.script_upload_path = ("/usr/share/glustolibs/io/scripts/"
                                  "file_dir_ops.py")
        ret = upload_scripts(cls.clients, [script_local_path])
        if not ret:
            raise ExecutionError("Failed to upload IO scripts to clients %s"
                                 % cls.clients)
        g.log.info("Successfully uploaded IO scripts to clients %s"
                   % cls.clients)

        cls.counter = 1
        """int: Value of counter is used for dirname-start-num argument for
        file_dir_ops.py create_deep_dirs_with_files.

        The --dir-length argument value for
        file_dir_ops.py create_deep_dirs_with_files is set to 10
        (refer to the cmd in setUp method). This means every mount will create
        10 top level dirs. For every mountpoint/testcase to create new set of
        dirs, we are incrementing the counter by --dir-length value i.e 10
        in this test suite.

        If we are changing the --dir-length to new value, ensure the counter
        is also incremented by same value to create new set of files/dirs.
        """

        # Setup Volumes
        if cls.volume_type == "distributed-replicated":
            cls.volume_configs = []

            # Define two 2x2 distributed-replicated volumes
            for i in range(1, 3):
                cls.volume['voltype'] = {
                    'type': 'distributed-replicated',
                    'replica_count': 2,
                    'dist_count': 2,
                    'transport': 'tcp',
                }
                cls.volume_configs.append(
                    {'name': 'testvol_%s_%d'
                             % (cls.volume['voltype']['type'], i),
                     'servers': cls.servers,
                     'voltype': cls.volume['voltype']
                     })

            # Define two 2x3 distributed-replicated volumes
            for i in range(1, 3):
                cls.volume['voltype'] = {
                    'type': 'distributed-replicated',
                    'replica_count': 3,
                    'dist_count': 2,
                    'transport': 'tcp',
                }
                cls.volume_configs.append(
                    {'name': 'testvol_%s_%d'
                             % (cls.volume['voltype']['type'], i+2),
                     'servers': cls.servers,
                     'voltype': cls.volume['voltype']
                     })

            # Define distributed volume
            cls.volume['voltype'] = {
                'type': 'distributed',
                'dist_count': 3,
                'transport': 'tcp',
            }
            cls.volume_configs.append(
                {'name': 'testvol_%s'
                         % cls.volume['voltype']['type'],
                 'servers': cls.servers,
                 'voltype': cls.volume['voltype']
                 })

            # Create and mount volumes
            cls.mount_points = []
            cls.mount_points_and_volnames = {}
            cls.client = cls.clients[0]
            for volume_config in cls.volume_configs:
                # Setup volume
                ret = setup_volume(mnode=cls.mnode,
                                   all_servers_info=cls.all_servers_info,
                                   volume_config=volume_config,
                                   force=False)
                if not ret:
                    raise ExecutionError("Failed to setup Volume"
                                         " %s", volume_config['name'])
                g.log.info("Successful in setting volume %s",
                           volume_config['name'])

                # Mount volume
                mount_point = tempfile.mkdtemp()
                cls.mount_points.append(mount_point)
                cls.mount_points_and_volnames[volume_config['name']] = \
                    mount_point
                ret, _, _ = mount_volume(volume_config['name'],
                                         cls.mount_type,
                                         mount_point,
                                         cls.mnode,
                                         cls.client)
                if ret:
                    raise ExecutionError(
                        "Failed to do gluster mount on volume %s "
                        % cls.volname)
                g.log.info("Successfully mounted %s on client %s"
                           % (cls.volname, cls.client))

    def setUp(self):
        # Calling GlusterBaseClass setUp
        GlusterBaseClass.setUp.im_func(self)

        self.all_mounts_procs = []
        self.io_validation_complete = False

    def tearDown(self):
        """
        If test method failed before validating IO, tearDown waits for the
        IO's to complete and checks for the IO exit status

        Cleanup and umount volume
        """
        if not self.io_validation_complete:
            g.log.info("Wait for IO to complete as IO validation did not "
                       "succeed in test method")
            ret = wait_for_io_to_complete(self.all_mounts_procs, self.mounts)
            if not ret:
                raise ExecutionError("IO failed on some of the clients")
            g.log.info("IO is successful on all mounts")

            # List all files and dirs created
            g.log.info("List all files and directories:")
            ret = list_all_files_and_dirs_mounts(self.mounts)
            if not ret:
                raise ExecutionError("Failed to list all files and dirs")
            g.log.info("Listing all files and directories is successful")

        # Calling GlusterBaseClass teardown
        GlusterBaseClass.tearDown.im_func(self)

    @classmethod
    def tearDownClass(cls):
        """
        Clean up the volume and umount volume from client
        """
        # stopping all volumes
        g.log.info("Starting to Cleanup all Volumes")
        volume_list = get_volume_list(cls.mnode)
        for volume in volume_list:
            ret = cleanup_volume(cls.mnode, volume)
            if not ret:
                raise ExecutionError("Failed to cleanup Volume %s" % volume)
            g.log.info("Volume: %s cleanup is done" % volume)
        g.log.info("Successfully Cleanedup all Volumes")

        # umount all volumes
        for mount_point in cls.mount_points:
            ret, _, _ = umount_volume(cls.client, mount_point)
            if ret:
                raise ExecutionError(
                    "Failed to umount on volume %s "
                    % cls.volname)
            g.log.info("Successfully umounted %s on client %s"
                       % (cls.volname, cls.client))

        # calling GlusterBaseClass tearDownClass
        GlusterBaseClass.tearDownClass.im_func(cls)

    def test_client_side_quorum_auto_local_to_volume_not_cluster(self):
        """
        - create four volume as below
            vol1->2x2
            vol2->2x2
            vol3->2x3
            vol4->2x3
            vol5->a pure distribute volume
        - do IO to all vols
        - set client side quorum to auto for vol1 and vol3
        - get the client side quorum value for all vols and check for result
        - bring down b0 on vol1 and b0 and b1 on vol3
        - try to create files on all vols and check for result
        """
        # Creating files for all volumes
        for mount_point in self.mount_points:
            self.all_mounts_procs = []
            for mount_obj in self.mounts:
                g.log.info("Generating data for %s:%s"
                           % (mount_obj.client_system, mount_point))
                # Create files
                g.log.info('Creating files...')
                command = ("python %s create_files -f 50 "
                           "--fixed-file-size 1k %s"
                           % (self.script_upload_path, mount_point))

                proc = g.run_async(mount_obj.client_system, command,
                                   user=mount_obj.user)
                self.all_mounts_procs.append(proc)
            self.io_validation_complete = False

            # Validate IO
            g.log.info("Wait for IO to complete and validate IO ...")
            ret = validate_io_procs(self.all_mounts_procs, self.mounts)
            self.assertTrue(ret, "IO failed on some of the clients")
            self.io_validation_complete = True
            g.log.info("IO is successful on all mounts")

        volumes_to_change_options = ['1', '3']
        # set cluster.quorum-type to auto
        for vol_number in volumes_to_change_options:
            vol_name = ('testvol_distributed-replicated_%s'
                        % vol_number)
            options = {"cluster.quorum-type": "auto"}
            g.log.info("setting cluster.quorum-type to auto on "
                       "volume testvol_distributed-replicated_%s"
                       % vol_number)
            ret = set_volume_options(self.mnode, vol_name, options)
            self.assertTrue(ret, ("Unable to set volume option %s for "
                                  "volume %s" % (options, vol_name)))
            g.log.info("Sucessfully set %s for volume %s"
                       % (options, vol_name))

        # check is options are set correctly
        volume_list = get_volume_list(self.mnode)
        for volume in volume_list:
            g.log.info('Checking for cluster.quorum-type option for %s'
                       % volume)
            volume_options_dict = get_volume_options(self.mnode,
                                                     volume,
                                                     'cluster.quorum-type')
            if (volume == 'testvol_distributed-replicated_1' or
                    volume == 'testvol_distributed-replicated_3'):
                self.assertEqual(volume_options_dict['cluster.quorum-type'],
                                 'auto',
                                 'Option cluster.quorum-type '
                                 'is not AUTO for %s'
                                 % volume)
                g.log.info('Option cluster.quorum-type is AUTO for %s'
                           % volume)
            else:
                self.assertEqual(volume_options_dict['cluster.quorum-type'],
                                 'none',
                                 'Option cluster.quorum-type '
                                 'is not NONE for %s'
                                 % volume)
                g.log.info('Option cluster.quorum-type is NONE for %s'
                           % volume)

        # Get first brick server and brick path
        # and get first file from filelist then delete it from volume
        vols_file_list = {}
        for volume in volume_list:
            brick_list = get_all_bricks(self.mnode, volume)
            brick_server, brick_path = brick_list[0].split(':')
            ret, file_list, err = g.run(brick_server, 'ls %s' % brick_path)
            self.assertFalse(ret, 'Failed to ls files on %s' % brick_server)
            file_from_vol = file_list.splitlines()[0]
            ret, out, err = g.run(brick_server, 'rm -rf %s/%s'
                                  % (brick_path, file_from_vol))
            self.assertFalse(ret, 'Failed to rm file on %s' % brick_server)
            vols_file_list[volume] = file_from_vol

        # bring bricks offline
        # bring first brick for testvol_distributed-replicated_1
        volname = 'testvol_distributed-replicated_1'
        brick_list = get_all_bricks(self.mnode, volname)
        bricks_to_bring_offline = brick_list[0:1]
        g.log.info('Bringing bricks %s offline...' % bricks_to_bring_offline)
        ret = bring_bricks_offline(volname, bricks_to_bring_offline)
        self.assertTrue(ret, 'Failed to bring bricks %s offline' %
                        bricks_to_bring_offline)

        ret = are_bricks_offline(self.mnode, volname,
                                 bricks_to_bring_offline)
        self.assertTrue(ret, 'Bricks %s are not offline'
                        % bricks_to_bring_offline)
        g.log.info('Bringing bricks %s offline is successful'
                   % bricks_to_bring_offline)

        # bring first two bricks for testvol_distributed-replicated_3
        volname = 'testvol_distributed-replicated_3'
        brick_list = get_all_bricks(self.mnode, volname)
        bricks_to_bring_offline = brick_list[0:2]
        g.log.info('Bringing bricks %s offline...' % bricks_to_bring_offline)
        ret = bring_bricks_offline(volname, bricks_to_bring_offline)
        self.assertTrue(ret, 'Failed to bring bricks %s offline' %
                        bricks_to_bring_offline)

        ret = are_bricks_offline(self.mnode, volname,
                                 bricks_to_bring_offline)
        self.assertTrue(ret, 'Bricks %s are not offline'
                        % bricks_to_bring_offline)
        g.log.info('Bringing bricks %s offline is successful'
                   % bricks_to_bring_offline)

        # merge two dicts (volname: file_to_delete) and (volname: mountpoint)
        temp_dict = [vols_file_list, self.mount_points_and_volnames]
        file_to_delete_to_mountpoint_dict = {}
        for k in vols_file_list.iterkeys():
            file_to_delete_to_mountpoint_dict[k] = (
                tuple(file_to_delete_to_mountpoint_dict[k]
                      for file_to_delete_to_mountpoint_dict in
                      temp_dict))

        # create files on all volumes and check for result
        for volname, file_and_mountpoint in \
                file_to_delete_to_mountpoint_dict.iteritems():
            filename, mountpoint = file_and_mountpoint

            # check for ROFS error for read-only file system for
            # testvol_distributed-replicated_1 and
            # testvol_distributed-replicated_3
            if (volname == 'testvol_distributed-replicated_1' or
                    volname == 'testvol_distributed-replicated_3'):
                # create new file taken from vols_file_list
                g.log.info("Start creating new file on all mounts...")
                all_mounts_procs = []
                cmd = ("touch %s/%s" % (mountpoint, filename))

                proc = g.run_async(self.client, cmd)
                all_mounts_procs.append(proc)

                # Validate IO
                g.log.info("Validating if IO failed with read-only filesystem")
                ret = is_io_procs_fail_with_rofs(self, all_mounts_procs,
                                                 self.mounts)
                self.assertTrue(ret, ("Unexpected error and IO successfull"
                                      " on read-only filesystem"))
                g.log.info("EXPECTED: "
                           "Read-only file system in IO while creating file")

            # check for no errors for all the rest volumes
            else:
                # create new file taken from vols_file_list
                g.log.info("Start creating new file on all mounts...")
                all_mounts_procs = []
                cmd = ("touch %s/%s" % (mountpoint, filename))

                proc = g.run_async(self.client, cmd)
                all_mounts_procs.append(proc)

                # Validate IO
                g.log.info("Validating IO on mounts")
                ret = validate_io_procs(all_mounts_procs, self.mounts)
                self.assertTrue(ret, "IO failed on some of the clients")
                g.log.info("IO is successful on all mounts")