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#!/usr/bin/python 

# 

# Copyright (C) Citrix Systems Inc. 

# 

# This program is free software; you can redistribute it and/or modify  

# it under the terms of the GNU Lesser General Public License as published  

# by the Free Software Foundation; version 2.1 only. 

# 

# 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 Lesser General Public License for more details. 

# 

# You should have received a copy of the GNU Lesser 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 

# 

# OCFSSR: OCFS implementation over a local disk. 

# 

 

import SR, VDI, SRCommand, FileSR, util 

import errno 

import os 

import xmlrpclib 

import xs_errors 

import vhdutil 

from lock import Lock 

import cleanup 

import xml.dom.minidom 

 

CAPABILITIES = ["SR_PROBE","SR_UPDATE", "SR_CACHING", 

                "VDI_CREATE","VDI_DELETE","VDI_ATTACH","VDI_DETACH", 

                "VDI_UPDATE", "VDI_CLONE","VDI_SNAPSHOT","VDI_RESIZE", 

                "VDI_GENERATE_CONFIG", "VDI_MIRROR", 

                "VDI_RESET_ON_BOOT", "ATOMIC_PAUSE"] 

 

CONFIGURATION = [ ['device', 'local device path (required) (e.g. /dev/sdx)'] ] 

 

DRIVER_INFO = { 

    'name': 'OCFS VHD', 

    'description': 'SR plugin which stores disks as VHD files a OCFS filesystem', 

    'vendor': 'Citrix Systems Inc', 

    'copyright': '(C) Citrix Systems Inc', 

    'driver_version': '1.0', 

    'required_api_version': '1.0', 

    'capabilities': CAPABILITIES, 

    'configuration': CONFIGURATION 

    } 

 

DRIVER_CONFIG = {"ATTACH_FROM_CONFIG_WITH_TAPDISK": True} 

 

class OCFSSR(FileSR.FileSR): 

    """OCFS file-based storage repository""" 

    def handles(type): 

        return type == 'ocfs' 

    handles = staticmethod(handles) 

 

 

    def load(self, sr_uuid): 

        if not self.dconf.has_key('device') or not self.dconf['device']: 

            raise xs_errors.XenError('ConfigDeviceMissing',) 

        self.blockdevice = self.dconf['device'] 

        if not self._isvalidpathstring(self.blockdevice): 

            raise xs_errors.XenError('ConfigDeviceInvalid', \ 

                    opterr='path is %s' % self.blockdevice) 

 

        self.isMaster = False 

        if self.dconf.has_key('SRmaster') and self.dconf['SRmaster'] == 'true': 

            self.isMaster = True 

 

        self.uuid = sr_uuid 

 

        self.ops_exclusive = FileSR.OPS_EXCLUSIVE 

        self.lock = Lock(vhdutil.LOCK_TYPE_SR, self.uuid) 

        self.sr_vditype = SR.DEFAULT_TAP 

        self.driver_config = DRIVER_CONFIG 

        self.path = os.path.join(SR.MOUNT_BASE, sr_uuid) 

 

    def mount(self, mountpoint, blockdevice): 

        try: 

            if not util.ioretry(lambda: util.isdir(mountpoint)): 

                util.ioretry(lambda: util.makedirs(mountpoint)) 

        except util.CommandException: 

            raise xs_errors.XenError('SRUnavailable', \ 

                  opterr='no such directory %s' % mountpoint) 

 

        cmd = ['mount', '-t', 'ocfs2', blockdevice, mountpoint, '-o', \ 

               'noatime,data=writeback,nointr,commit=60,coherency=buffered'] 

        try: 

             ret = util.pread(cmd) 

        except util.CommandException, inst: 

             raise xs_errors.XenError('OCFSMount', 

                                      opterr='Failed to mount FS. Errno is %d' \ 

                                             % os.strerror(inst.code)) 

 

    def attach(self, sr_uuid): 

        if not self._checkmount(): 

            self.mount(self.path, self.blockdevice) 

        self.attached = True 

 

    def probe(self): 

        # We are not storing sr-uuid in the remote disk, return NULL during a  

        # probe 

        dom = xml.dom.minidom.Document() 

        return dom.toprettyxml() 

 

    def detach(self, sr_uuid): 

        """Detach the SR: Unmounts and removes the mountpoint""" 

        if not self._checkmount(): 

            return 

        util.SMlog("Aborting GC/coalesce") 

        cleanup.abort(self.uuid) 

 

        # Change directory to avoid unmount conflicts 

        os.chdir(SR.MOUNT_BASE) 

 

        cmd = ['umount', self.path ] 

        try: 

             ret = util.pread(cmd) 

        except util.CommandException, inst: 

                raise xs_errors.XenError('OCFSUnMount', \ 

                      opterr='Failed to umount FS. Errno is %d' % \ 

                      os.strerror(inst.code)) 

 

        self.attached = False 

 

 

    def create(self, sr_uuid, size): 

        if util.pathexists(self.blockdevice): 

            util.zeroOut(self.blockdevice, 0, 1024*1024) 

        cmd = ['mkfs', '-t', 'ocfs2', '-b', '4K', '-C', '1M', '-N', '16', '-F', self.blockdevice ] 

        try: 

            ret = util.pread(cmd) 

        except util.CommandException, inst: 

            raise xs_errors.XenError('OCFSFilesystem', \ 

                  opterr='mkfs failed error %d' % os.strerror(inst.code)) 

 

    def delete(self, sr_uuid): 

        # Do a mount and remove any non-VDI files 

        self.attach(sr_uuid) 

        super(OCFSSR, self).delete(sr_uuid) 

        self.detach(sr_uuid) 

 

    def vdi(self, uuid, loadLocked = False): 

        if not loadLocked: 

            return OCFSFileVDI(self, uuid) 

        return OCFSFileVDI(self, uuid) 

 

 

class OCFSFileVDI(FileSR.FileVDI): 

    def attach(self, sr_uuid, vdi_uuid): 

        if not hasattr(self,'xenstore_data'): 

            self.xenstore_data = {} 

 

        self.xenstore_data["storage-type"]="ocfs" 

 

        return super(OCFSFileVDI, self).attach(sr_uuid, vdi_uuid) 

 

    def generate_config(self, sr_uuid, vdi_uuid): 

        util.SMlog("OCFSFileVDI.generate_config") 

        if not util.pathexists(self.path): 

                raise xs_errors.XenError('VDIUnavailable') 

        resp = {} 

        resp['device_config'] = self.sr.dconf 

        resp['sr_uuid'] = sr_uuid 

        resp['vdi_uuid'] = vdi_uuid 

        resp['command'] = 'vdi_attach_from_config' 

        # Return the 'config' encoded within a normal XMLRPC response so that 

        # we can use the regular response/error parsing code. 

        config = xmlrpclib.dumps(tuple([resp]), "vdi_attach_from_config") 

        return xmlrpclib.dumps((config,), "", True) 

 

    def attach_from_config(self, sr_uuid, vdi_uuid): 

        """Used for HA State-file only. Will not just attach the VDI but 

        also start a tapdisk on the file""" 

        util.SMlog("OCFSFileVDI.attach_from_config") 

        try: 

            if not util.pathexists(self.sr.path): 

                self.sr.attach(sr_uuid) 

        except: 

            util.logException("OCFSFileVDI.attach_from_config") 

            raise xs_errors.XenError('SRUnavailable', \ 

                        opterr='Unable to attach from config') 

 

 

if __name__ == '__main__': 

    SRCommand.run(OCFSSR, DRIVER_INFO) 

else: 

    SR.registerSR(OCFSSR)