Merge "Fixes ceph volume restore to larger image than source"
This commit is contained in:
Jenkins
Gerrit Code Review
commit
2a725ef15d
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@ -78,7 +78,10 @@ service_opts = [
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cfg.IntOpt('backup_ceph_stripe_unit', default=0,
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help='RBD stripe unit to use when creating a backup image'),
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cfg.IntOpt('backup_ceph_stripe_count', default=0,
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help='RBD stripe count to use when creating a backup image')
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help='RBD stripe count to use when creating a backup image'),
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cfg.BoolOpt('restore_discard_excess_bytes', default=True,
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help='If True, always discard excess bytes when restoring '
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'volumes.')
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]
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CONF = cfg.CONF
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@ -210,6 +213,24 @@ class CephBackupDriver(BackupDriver):
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raise exception.InvalidParameterValue(msg)
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return self._utf8("volume-%s.backup.%s" % (volume_id, backup_id))
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def _discard_bytes(self, volume, offset, length):
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"""Trim length bytes from offset.
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If the volume is an rbd do a discard() otherwise assume it is a file
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and pad with zeroes.
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"""
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if length:
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LOG.info("discarding %s bytes from offset %s" %
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(length, offset))
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if self._file_is_rbd(volume):
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volume.rbd_image.discard(offset, length)
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else:
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zeroes = '\0' * length
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chunks = int(length / self.chunk_size)
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for chunk in xrange(0, chunks):
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LOG.debug("writing zeroes chunk %d" % (chunk))
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volume.write(zeroes)
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def _transfer_data(self, src, src_name, dest, dest_name, length):
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"""Transfer data between files (Python IO objects)."""
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LOG.debug(_("transferring data between '%(src)s' and '%(dest)s'") %
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@ -222,13 +243,22 @@ class CephBackupDriver(BackupDriver):
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for chunk in xrange(0, chunks):
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before = time.time()
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data = src.read(self.chunk_size)
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# If we have reach end of source, discard any extraneous bytes from
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# destination volume if trim is enabled and stop writing.
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if data == '':
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if CONF.restore_discard_excess_bytes:
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self._discard_bytes(dest, dest.tell(),
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length - dest.tell())
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return
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dest.write(data)
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dest.flush()
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delta = (time.time() - before)
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rate = (self.chunk_size / delta) / 1024
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LOG.debug((_("transferred chunk %(chunk)s of %(chunks)s "
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"(%(rate)dK/s)") %
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{'chunk': chunk, 'chunks': chunks,
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{'chunk': chunk + 1, 'chunks': chunks,
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'rate': rate}))
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# yield to any other pending backups
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@ -238,10 +268,14 @@ class CephBackupDriver(BackupDriver):
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if rem:
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LOG.debug(_("transferring remaining %s bytes") % (rem))
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data = src.read(rem)
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dest.write(data)
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dest.flush()
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# yield to any other pending backups
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eventlet.sleep(0)
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if data == '':
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if CONF.restore_discard_excess_bytes:
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self._discard_bytes(dest, dest.tell(), rem)
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else:
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dest.write(data)
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dest.flush()
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# yield to any other pending backups
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eventlet.sleep(0)
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def _create_base_image(self, name, size, rados_client):
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"""Create a base backup image.
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@ -370,7 +404,7 @@ class CephBackupDriver(BackupDriver):
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def _rbd_diff_transfer(self, src_name, src_pool, dest_name, dest_pool,
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src_user, src_conf, dest_user, dest_conf,
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src_snap=None, from_snap=None):
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"""Backup only extents changed between two points.
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"""Copy only extents changed between two points.
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If no snapshot is provided, the diff extents will be all those changed
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since the rbd volume/base was created, otherwise it will be those
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@ -431,7 +465,7 @@ class CephBackupDriver(BackupDriver):
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def _snap_exists(self, base_name, snap_name, client):
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"""Return True if snapshot exists in base image."""
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base_rbd = self.rbd.Image(client.ioctx, base_name)
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base_rbd = self.rbd.Image(client.ioctx, base_name, read_only=True)
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try:
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snaps = base_rbd.list_snaps()
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finally:
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@ -707,23 +741,26 @@ class CephBackupDriver(BackupDriver):
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def _full_restore(self, backup_id, volume_id, dest_file, dest_name,
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length, src_snap=None):
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"""Restore the given volume file from backup RBD.
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"""Restore volume using full copy i.e. all extents.
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This will result in all extents being copied from source to destination
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This will result in all extents being copied from source to
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destination.
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"""
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with drivers.rbd.RADOSClient(self, self._ceph_backup_pool) as client:
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# If a source snapshot is provided we assume the base is diff
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# format.
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if src_snap:
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# If a source snapshot is provided we assume the base is diff
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# format.
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backup_name = self._get_backup_base_name(volume_id,
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diff_format=True)
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diff_format = True
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else:
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backup_name = self._get_backup_base_name(volume_id, backup_id)
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diff_format = False
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backup_name = self._get_backup_base_name(volume_id,
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backup_id=backup_id,
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diff_format=diff_format)
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# Retrieve backup volume
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src_rbd = self.rbd.Image(client.ioctx, backup_name,
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snapshot=src_snap)
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snapshot=src_snap, read_only=True)
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try:
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rbd_meta = drivers.rbd.RBDImageMetadata(src_rbd,
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self._ceph_backup_pool,
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@ -735,11 +772,40 @@ class CephBackupDriver(BackupDriver):
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finally:
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src_rbd.close()
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def _restore_rbd(self, base_name, volume_file, volume_name, restore_point):
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"""Restore RBD volume from RBD image."""
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rbd_user = volume_file.rbd_user
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rbd_pool = volume_file.rbd_pool
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rbd_conf = volume_file.rbd_conf
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def _check_restore_vol_size(self, backup_base, restore_vol, restore_length,
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src_pool):
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"""Ensure that the restore volume is the correct size.
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If the restore volume was bigger than the backup, the diff restore will
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shrink it to the size of the original backup so we need to
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post-process and resize it back to its expected size.
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"""
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with drivers.rbd.RADOSClient(self, self._ceph_backup_pool) as client:
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adjust_size = 0
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base_image = self.rbd.Image(client.ioctx, self._utf8(backup_base),
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read_only=True)
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try:
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if restore_length != base_image.size():
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adjust_size = restore_length
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finally:
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base_image.close()
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if adjust_size:
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with drivers.rbd.RADOSClient(self, src_pool) as client:
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dest_image = self.rbd.Image(client.ioctx,
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self._utf8(restore_vol))
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try:
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LOG.debug("adjusting restore vol size")
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dest_image.resize(adjust_size)
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finally:
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dest_image.close()
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def _diff_restore_rbd(self, base_name, restore_file, restore_name,
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restore_point, restore_length):
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"""Attempt restore rbd volume from backup using diff transfer."""
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rbd_user = restore_file.rbd_user
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rbd_pool = restore_file.rbd_pool
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rbd_conf = restore_file.rbd_conf
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LOG.debug(_("trying incremental restore from base='%(base)s' "
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"snap='%(snap)s'") %
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@ -747,7 +813,7 @@ class CephBackupDriver(BackupDriver):
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before = time.time()
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try:
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self._rbd_diff_transfer(base_name, self._ceph_backup_pool,
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volume_name, rbd_pool,
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restore_name, rbd_pool,
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src_user=self._ceph_backup_user,
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src_conf=self._ceph_backup_conf,
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dest_user=rbd_user, dest_conf=rbd_conf,
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@ -757,13 +823,21 @@ class CephBackupDriver(BackupDriver):
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"restore"))
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raise
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# If the volume we are restoring to is larger than the backup volume,
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# we will need to resize it after the diff import since import-diff
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# appears to shrink the target rbd volume to the size of the original
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# backup volume.
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self._check_restore_vol_size(base_name, restore_name, restore_length,
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rbd_pool)
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LOG.debug(_("restore transfer completed in %.4fs") %
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(time.time() - before))
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def _num_backup_snaps(self, backup_base_name):
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"""Return the number of snapshots that exist on the base image."""
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with drivers.rbd.RADOSClient(self, self._ceph_backup_pool) as client:
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base_rbd = self.rbd.Image(client.ioctx, backup_base_name)
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base_rbd = self.rbd.Image(client.ioctx, backup_base_name,
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read_only=True)
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try:
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snaps = self.get_backup_snaps(base_rbd)
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finally:
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@ -780,7 +854,7 @@ class CephBackupDriver(BackupDriver):
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If the backup was not incremental None is returned.
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"""
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with drivers.rbd.RADOSClient(self, self._ceph_backup_pool) as client:
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base_rbd = self.rbd.Image(client.ioctx, base_name)
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base_rbd = self.rbd.Image(client.ioctx, base_name, read_only=True)
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try:
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restore_point = self._get_backup_snap_name(base_rbd, base_name,
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backup_id)
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@ -856,8 +930,11 @@ class CephBackupDriver(BackupDriver):
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return not_allowed
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def _try_restore(self, backup, volume, volume_file):
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"""Attempt to restore volume from backup."""
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def _restore_volume(self, backup, volume, volume_file):
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"""Restore volume from backup using diff transfer if possible.
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Attempts a differential restore and reverts to full copy if diff fails.
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"""
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volume_name = volume['name']
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backup_id = backup['id']
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backup_volume_id = backup['volume_id']
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@ -867,20 +944,19 @@ class CephBackupDriver(BackupDriver):
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diff_format=True)
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with drivers.rbd.RADOSClient(self, self._ceph_backup_pool) as client:
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diff_restore, restore_point = \
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diff_allowed, restore_point = \
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self._diff_restore_allowed(base_name, backup, volume,
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volume_file, client)
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if diff_restore:
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do_full_restore = True
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if diff_allowed:
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# Attempt diff
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try:
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self._diff_restore_rbd(base_name, volume_file, volume_name,
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restore_point, length)
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do_full_restore = False
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self._restore_rbd(base_name, volume_file, volume_name,
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restore_point)
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except exception.BackupRBDOperationFailed:
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LOG.debug(_("forcing full restore"))
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do_full_restore = True
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else:
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do_full_restore = True
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if do_full_restore:
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# Otherwise full copy
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@ -894,13 +970,10 @@ class CephBackupDriver(BackupDriver):
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'volume=%(dest)s') %
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{'src': backup['id'], 'dest': target_volume['name']})
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# Ensure we are at the beginning of the volume
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volume_file.seek(0)
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try:
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self._try_restore(backup, target_volume, volume_file)
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self._restore_volume(backup, target_volume, volume_file)
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# Be tolerant to IO implementations that do not support fileno()
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# Be tolerant of IO implementations that do not support fileno()
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try:
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fileno = volume_file.fileno()
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except IOError:
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@ -909,7 +982,7 @@ class CephBackupDriver(BackupDriver):
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else:
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os.fsync(fileno)
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LOG.debug(_('restore finished.'))
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LOG.debug(_('restore finished successfully.'))
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except exception.BackupOperationError as e:
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LOG.error(_('restore finished with error - %s') % (e))
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raise
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@ -926,8 +999,8 @@ class CephBackupDriver(BackupDriver):
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"that db entry can be removed")
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LOG.warning(msg)
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LOG.info(_("delete '%s' finished with warning") % (backup_id))
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LOG.debug(_("delete '%s' finished") % (backup_id))
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else:
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LOG.debug(_("delete '%s' finished") % (backup_id))
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def get_backup_driver(context):
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@ -95,6 +95,9 @@ class mock_rbd(object):
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def resize(self, *args, **kwargs):
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raise NotImplementedError()
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def discard(self, offset, length):
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raise NotImplementedError()
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def close(self):
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pass
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@ -31,6 +31,7 @@ from cinder.openstack.common import processutils
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from cinder import test
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from cinder.tests.backup.fake_rados import mock_rados
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from cinder.tests.backup.fake_rados import mock_rbd
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from cinder import units
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from cinder.volume.drivers import rbd as rbddriver
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LOG = logging.getLogger(__name__)
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@ -293,6 +294,9 @@ class BackupCephTestCase(test.TestCase):
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self.stubs.Set(self.service.rbd.Image, 'write', write_data)
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self.stubs.Set(self.service, '_discard_bytes',
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lambda *args: None)
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self.service.backup(backup, self.volume_file)
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# Ensure the files are equal
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@ -340,6 +344,9 @@ class BackupCephTestCase(test.TestCase):
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self.stubs.Set(self.service.rbd.Image, 'write', write_data)
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self.stubs.Set(self.service.rbd.RBD, 'list', rbd_list)
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self.stubs.Set(self.service, '_discard_bytes',
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lambda *args: None)
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meta = rbddriver.RBDImageMetadata(self.service.rbd.Image(),
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'pool_foo', 'user_foo',
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'conf_foo')
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@ -372,6 +379,8 @@ class BackupCephTestCase(test.TestCase):
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self.stubs.Set(self.service.rbd.RBD, 'list', rbd_list)
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self.stubs.Set(self.service, '_discard_bytes', lambda *args: None)
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with tempfile.NamedTemporaryFile() as test_file:
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self.volume_file.seek(0)
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@ -390,8 +399,30 @@ class BackupCephTestCase(test.TestCase):
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# Ensure the files are equal
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self.assertEqual(checksum.digest(), self.checksum.digest())
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def test_create_base_image_if_not_exists(self):
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pass
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def test_discard_bytes(self):
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self.service._discard_bytes(mock_rbd(), 123456, 0)
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calls = []
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def _setter(*args, **kwargs):
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calls.append(True)
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self.stubs.Set(self.service.rbd.Image, 'discard', _setter)
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self.service._discard_bytes(mock_rbd(), 123456, 0)
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self.assertTrue(len(calls) == 0)
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image = mock_rbd().Image()
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wrapped_rbd = self._get_wrapped_rbd_io(image)
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self.service._discard_bytes(wrapped_rbd, 123456, 1234)
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self.assertTrue(len(calls) == 1)
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self.stubs.Set(image, 'write', _setter)
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wrapped_rbd = self._get_wrapped_rbd_io(image)
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self.stubs.Set(self.service, '_file_is_rbd',
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lambda *args: False)
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self.service._discard_bytes(wrapped_rbd, 0,
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self.service.chunk_size * 2)
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self.assertTrue(len(calls) == 3)
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def test_delete_backup_snapshot(self):
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snap_name = 'backup.%s.snap.3824923.1412' % (uuid.uuid4())
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|
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@ -521,50 +552,69 @@ class BackupCephTestCase(test.TestCase):
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self.service.delete(backup)
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def test_diff_restore_allowed_true(self):
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is_allowed = (True, 'restore.foo')
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restore_point = 'restore.foo'
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is_allowed = (True, restore_point)
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backup = db.backup_get(self.ctxt, self.backup_id)
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alt_volume_id = str(uuid.uuid4())
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self._create_volume_db_entry(alt_volume_id, 1)
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volume_size = 1
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self._create_volume_db_entry(alt_volume_id, volume_size)
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alt_volume = db.volume_get(self.ctxt, alt_volume_id)
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rbd_io = self._get_wrapped_rbd_io(self.service.rbd.Image())
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self.stubs.Set(self.service, '_get_restore_point',
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lambda *args: 'restore.foo')
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lambda *args: restore_point)
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self.stubs.Set(self.service, '_rbd_has_extents',
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lambda *args: False)
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self.stubs.Set(self.service, '_rbd_image_exists',
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lambda *args: (True, 'foo'))
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self.stubs.Set(self.service, '_file_is_rbd', lambda *args: True)
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self.stubs.Set(self.service, '_file_is_rbd',
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lambda *args: True)
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self.stubs.Set(self.service.rbd.Image, 'size',
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lambda *args: volume_size * units.GiB)
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resp = self.service._diff_restore_allowed('foo', backup, alt_volume,
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rbd_io, mock_rados())
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self.assertEqual(resp, is_allowed)
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def _set_service_stub(self, method, retval):
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self.stubs.Set(self.service, method, lambda *args, **kwargs: retval)
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def test_diff_restore_allowed_false(self):
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volume_size = 1
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not_allowed = (False, None)
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backup = db.backup_get(self.ctxt, self.backup_id)
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self._create_volume_db_entry(self.volume_id, 1)
|
||||
self._create_volume_db_entry(self.volume_id, volume_size)
|
||||
original_volume = db.volume_get(self.ctxt, self.volume_id)
|
||||
rbd_io = self._get_wrapped_rbd_io(self.service.rbd.Image())
|
||||
|
||||
self.stubs.Set(self.service, '_get_restore_point',
|
||||
lambda *args: None)
|
||||
test_args = 'foo', backup, original_volume, rbd_io, mock_rados()
|
||||
|
||||
self.stubs.Set(self.service, '_rbd_has_extents',
|
||||
lambda *args: True)
|
||||
|
||||
self.stubs.Set(self.service, '_rbd_image_exists',
|
||||
lambda *args: (False, 'foo'))
|
||||
|
||||
self.stubs.Set(self.service, '_file_is_rbd', lambda *args: False)
|
||||
|
||||
resp = self.service._diff_restore_allowed('foo', backup,
|
||||
original_volume, rbd_io,
|
||||
mock_rados())
|
||||
self._set_service_stub('_get_restore_point', None)
|
||||
resp = self.service._diff_restore_allowed(*test_args)
|
||||
self.assertEqual(resp, not_allowed)
|
||||
self._set_service_stub('_get_restore_point', 'restore.foo')
|
||||
|
||||
self._set_service_stub('_rbd_has_extents', True)
|
||||
resp = self.service._diff_restore_allowed(*test_args)
|
||||
self.assertEqual(resp, not_allowed)
|
||||
self._set_service_stub('_rbd_has_extents', False)
|
||||
|
||||
self._set_service_stub('_rbd_image_exists', (False, 'foo'))
|
||||
resp = self.service._diff_restore_allowed(*test_args)
|
||||
self.assertEqual(resp, not_allowed)
|
||||
self._set_service_stub('_rbd_image_exists', None)
|
||||
|
||||
self.stubs.Set(self.service.rbd.Image, 'size',
|
||||
lambda *args, **kwargs: volume_size * units.GiB * 2)
|
||||
resp = self.service._diff_restore_allowed(*test_args)
|
||||
self.assertEqual(resp, not_allowed)
|
||||
self.stubs.Set(self.service.rbd.Image, 'size',
|
||||
lambda *args, **kwargs: volume_size * units.GiB)
|
||||
|
||||
self._set_service_stub('_file_is_rbd', False)
|
||||
resp = self.service._diff_restore_allowed(*test_args)
|
||||
self.assertEqual(resp, not_allowed)
|
||||
self._set_service_stub('_file_is_rbd', True)
|
||||
|
||||
def tearDown(self):
|
||||
self.volume_file.close()
|
||||
|
|
|
|||
|
|
@ -155,7 +155,7 @@ class RBDImageIOWrapper(io.RawIOBase):
|
|||
elif whence == 1:
|
||||
new_offset = self._offset + offset
|
||||
elif whence == 2:
|
||||
new_offset = self.volume.size() - 1
|
||||
new_offset = self._rbd_meta.image.size()
|
||||
new_offset += offset
|
||||
else:
|
||||
raise IOError(_("Invalid argument - whence=%s not supported") %
|
||||
|
|
@ -774,9 +774,8 @@ class RBDDriver(driver.VolumeDriver):
|
|||
"""Create a new backup from an existing volume."""
|
||||
volume = self.db.volume_get(context, backup['volume_id'])
|
||||
pool = self.configuration.rbd_pool
|
||||
volname = volume['name']
|
||||
|
||||
with RBDVolumeProxy(self, volname, pool) as rbd_image:
|
||||
with RBDVolumeProxy(self, volume['name'], pool) as rbd_image:
|
||||
rbd_meta = RBDImageMetadata(rbd_image, self.configuration.rbd_pool,
|
||||
self.configuration.rbd_user,
|
||||
self.configuration.rbd_ceph_conf)
|
||||
|
|
|
|||
|
|
@ -172,6 +172,10 @@
|
|||
# (integer value)
|
||||
#backup_ceph_stripe_count=0
|
||||
|
||||
# If True, always discard excess bytes when restoring volumes.
|
||||
# (boolean value)
|
||||
#restore_discard_excess_bytes=true
|
||||
|
||||
|
||||
#
|
||||
# Options defined in cinder.backup.drivers.swift
|
||||
|
|
@ -1764,4 +1768,4 @@
|
|||
#volume_dd_blocksize=1M
|
||||
|
||||
|
||||
# Total option count: 378
|
||||
# Total option count: 379
|
||||
|
|
|
|||
Loading…
Reference in New Issue