scripts/vm/hypervisor/xenserver/xcpserver/NFSSR.py

#!/usr/bin/python # Licensed to the Apache Software Foundation (ASF) under one # or more contributor license agreements. See the NOTICE file # distributed with this work for additional information # regarding copyright ownership. The ASF licenses this file # to you under the Apache License, Version 2.0 (the # "License"); you may not use this file except in compliance # with the License. You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, # software distributed under the License is distributed on an # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY # KIND, either express or implied. See the License for the # specific language governing permissions and limitations # under the License. # FileSR: local-file storage repository import SR, VDI, SRCommand, FileSR, util import errno import os, re, sys, stat import time import xml.dom.minidom import xs_errors import nfs import vhdutil from lock import Lock import cleanup CAPABILITIES = ["SR_PROBE","SR_UPDATE", "SR_CACHING", \ "VDI_CREATE","VDI_DELETE","VDI_ATTACH","VDI_DETACH", \ "VDI_UPDATE", "VDI_CLONE","VDI_SNAPSHOT","VDI_RESIZE", \ "VDI_RESIZE_ONLINE", "VDI_RESET_ON_BOOT", "ATOMIC_PAUSE"] CONFIGURATION = [ [ 'server', 'hostname or IP address of NFS server (required)' ], \ [ 'serverpath', 'path on remote server (required)' ] ] DRIVER_INFO = { 'name': 'NFS VHD', 'description': 'SR plugin which stores disks as VHD files on a remote NFS filesystem', 'vendor': 'The Apache Software Foundation', 'copyright': 'Copyright (c) 2012 The Apache Software Foundation', 'driver_version': '1.0', 'required_api_version': '1.0', 'capabilities': CAPABILITIES, 'configuration': CONFIGURATION } # The mountpoint for the directory when performing an sr_probe. All probes PROBE_MOUNTPOINT = "probe" NFSPORT = 2049 DEFAULT_TRANSPORT = "tcp" class NFSSR(FileSR.FileSR): """NFS file-based storage repository""" def handles(type): return type == 'nfs' handles = staticmethod(handles) def load(self, sr_uuid): self.ops_exclusive = FileSR.OPS_EXCLUSIVE self.lock = Lock(vhdutil.LOCK_TYPE_SR, self.uuid) self.sr_vditype = SR.DEFAULT_TAP if not self.dconf.has_key('server'): raise xs_errors.XenError('ConfigServerMissing') self.remoteserver = self.dconf['server'] self.path = os.path.join(SR.MOUNT_BASE, sr_uuid) # Test for the optional 'nfsoptions' dconf attribute self.transport = DEFAULT_TRANSPORT if self.dconf.has_key('useUDP') and self.dconf['useUDP'] == 'true': self.transport = "udp" def validate_remotepath(self, scan): if not self.dconf.has_key('serverpath'): if scan: try: self.scan_exports(self.dconf['server']) except: pass raise xs_errors.XenError('ConfigServerPathMissing') if not self._isvalidpathstring(self.dconf['serverpath']): raise xs_errors.XenError('ConfigServerPathBad', \ opterr='serverpath is %s' % self.dconf['serverpath']) def check_server(self): try: nfs.check_server_tcp(self.remoteserver) except nfs.NfsException, exc: raise xs_errors.XenError('NFSVersion', opterr=exc.errstr) def mount(self, mountpoint, remotepath): try: nfs.soft_mount(mountpoint, self.remoteserver, remotepath, self.transport) except nfs.NfsException, exc: raise xs_errors.XenError('NFSMount', opterr=exc.errstr) def attach(self, sr_uuid): self.validate_remotepath(False) #self.remotepath = os.path.join(self.dconf['serverpath'], sr_uuid) self.remotepath = self.dconf['serverpath'] util._testHost(self.dconf['server'], NFSPORT, 'NFSTarget') self.mount_remotepath(sr_uuid) def mount_remotepath(self, sr_uuid): if not self._checkmount(): self.check_server() self.mount(self.path, self.remotepath) return super(NFSSR, self).attach(sr_uuid) def probe(self): # Verify NFS target and port util._testHost(self.dconf['server'], NFSPORT, 'NFSTarget') self.validate_remotepath(True) self.check_server() temppath = os.path.join(SR.MOUNT_BASE, PROBE_MOUNTPOINT) self.mount(temppath, self.dconf['serverpath']) try: return nfs.scan_srlist(temppath) finally: try: nfs.unmount(temppath, True) except: pass 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) try: nfs.unmount(self.path, True) except nfs.NfsException, exc: raise xs_errors.XenError('NFSUnMount', opterr=exc.errstr) return super(NFSSR, self).detach(sr_uuid) def create(self, sr_uuid, size): util._testHost(self.dconf['server'], NFSPORT, 'NFSTarget') self.validate_remotepath(True) if self._checkmount(): raise xs_errors.XenError('NFSAttached') # Set the target path temporarily to the base dir # so that we can create the target SR directory self.remotepath = self.dconf['serverpath'] try: self.mount_remotepath(sr_uuid) except Exception, exn: try: os.rmdir(self.path) except: pass raise exn #newpath = os.path.join(self.path, sr_uuid) #if util.ioretry(lambda: util.pathexists(newpath)): # if len(util.ioretry(lambda: util.listdir(newpath))) != 0: # self.detach(sr_uuid) # raise xs_errors.XenError('SRExists') #else: # try: # util.ioretry(lambda: util.makedirs(newpath)) # except util.CommandException, inst: # if inst.code != errno.EEXIST: # self.detach(sr_uuid) # raise xs_errors.XenError('NFSCreate', # opterr='remote directory creation error is %d' # % inst.code) self.detach(sr_uuid) def delete(self, sr_uuid): # try to remove/delete non VDI contents first super(NFSSR, self).delete(sr_uuid) try: if self._checkmount(): self.detach(sr_uuid) # Set the target path temporarily to the base dir # so that we can remove the target SR directory self.remotepath = self.dconf['serverpath'] self.mount_remotepath(sr_uuid) newpath = os.path.join(self.path, sr_uuid) if util.ioretry(lambda: util.pathexists(newpath)): util.ioretry(lambda: os.rmdir(newpath)) self.detach(sr_uuid) except util.CommandException, inst: self.detach(sr_uuid) if inst.code != errno.ENOENT: raise xs_errors.XenError('NFSDelete') def vdi(self, uuid, loadLocked = False): if not loadLocked: return NFSFileVDI(self, uuid) return NFSFileVDI(self, uuid) def _checkmount(self): return util.ioretry(lambda: util.pathexists(self.path)) \ and util.ioretry(lambda: util.ismount(self.path)) def scan_exports(self, target): util.SMlog("scanning2 (target=%s)" % target) dom = nfs.scan_exports(target) print >>sys.stderr,dom.toprettyxml() class NFSFileVDI(FileSR.FileVDI): def attach(self, sr_uuid, vdi_uuid): try: vdi_ref = self.sr.srcmd.params['vdi_ref'] self.session.xenapi.VDI.remove_from_xenstore_data(vdi_ref, \ "vdi-type") self.session.xenapi.VDI.remove_from_xenstore_data(vdi_ref, \ "storage-type") self.session.xenapi.VDI.add_to_xenstore_data(vdi_ref, \ "storage-type", "nfs") except: util.logException("NFSSR:attach") pass return super(NFSFileVDI, self).attach(sr_uuid, vdi_uuid) def get_mtime(self, path): st = util.ioretry_stat(lambda: os.stat(path)) return st[stat.ST_MTIME] def clone(self, sr_uuid, vdi_uuid): timestamp_before = int(self.get_mtime(self.sr.path)) ret = super(NFSFileVDI, self).clone(sr_uuid, vdi_uuid) timestamp_after = int(self.get_mtime(self.sr.path)) if timestamp_after == timestamp_before: util.SMlog("SR dir timestamp didn't change, updating") timestamp_after += 1 os.utime(self.sr.path, (timestamp_after, timestamp_after)) return ret if __name__ == '__main__': SRCommand.run(NFSSR, DRIVER_INFO) else: SR.registerSR(NFSSR)

scripts/vm/hypervisor/xenserver/xcpserver/NFSSR.py (171 lines of code) (raw):