def get_target_from_tag_and_type(self, target_tag, target_type):
"""
This function aims to retrieve a target look for it's type
and it's tag.
"""
target = None
if target_type == 'MGT' or target_type == 'MGS':
# The target is the MGT
target = self.get_target_mgt()
elif target_type == 'MDT':
# The target is the MDT
target = self.get_target_mdt()
elif target_type == 'OST':
# The target is an OST. Walk through the list of
# OSTs to retrieve the right one.
for current_ost in self.iter_targets_ost():
if current_ost.get_tag() == target_tag:
# The ost tag match the searched one.
# save the target and break the loop
target = current_ost
break
else:
# The target type is currently not supported by the
# configuration
raise ConfigException("Unknown target type %s" % target_type)
return target
def _cache_path(cls, fsname):
"""Build and check a cache file path from filesystem name."""
fs_conf_dir = os.path.expandvars(Globals().get_conf_dir())
if not os.path.exists(fs_conf_dir):
raise ConfigException("Cache directory does not exist '%s'" %
fs_conf_dir)
return "%s/%s.xmf" % (os.path.normpath(fs_conf_dir), fsname)
def get_default_mount_path(self):
"""
Return the default client mount path or raise a ConfigException
if it does not exist.
"""
if not 'mount_path' in self._fs.model:
raise ConfigException("mount_path not specified")
return self._fs.get('mount_path')
def get_nid(self, node):
try:
return self.nid_map[node]
except KeyError:
raise ConfigException("Cannot get NID for %s, aborting. Please "
"verify `nid_map' configuration." % node)
def compare(self, otherfs):
"""
Compare the FileSystem model with another FileSystem and return
a dictionnary describing the needed actions.
"""
actions = {}
added, changed, removed = self.model.diff(otherfs.model)
anyset = set(changed.iterkeys()) | set(added.iterkeys()) \
| set(removed.iterkeys())
# Read-only keys: fs_name
readonly = set(['fs_name'])
if readonly & anyset:
raise ConfigException("%s could not be changed" %
", ".join(readonly & anyset))
# Need to reformat targets
reformatkeys = set([
'mgt_mkfs_options', 'mdt_mkfs_options', 'ost_mkfs_options',
'mgt_format_params', 'mdt_format_params', 'ost_format_params'
])
if reformatkeys & anyset:
actions['reformat'] = True
# Need a tunefs.lustre
tunefskeys = set([
'quota', 'quota_type', 'quota_bunit', 'quota_iunit', 'quota_btune',
'quota_itune', 'stripe_size', 'stripe_count'
])
if tunefskeys & anyset:
actions['tunefs'] = True
# Need a writeconf
writeconfkeys = set(['nid_map'])
if writeconfkeys & anyset:
# Note: Target removal could also set this flag.
actions['writeconf'] = True
# Need to unmount then remount clients
remountkeys = set(['mount_options', 'mount_path'])
if remountkeys & anyset:
actions['copyconf'] = True
# Could be improved if doing this only on clients without specific
# path or options.
if self.model.get('client'):
actions['unmount'] = [
Clients(cli) for cli in self.model.get('client')
]
if otherfs.model.get('client'):
actions['mount'] = [
Clients(cli) for cli in otherfs.model.get('client')
]
# Need to restart targets
restartkeys = set([
'mgt_mount_path', 'mdt_mount_path', 'ost_mount_path',
'mgt_mount_options', 'mdt_mount_options', 'ost_mount_options'
])
if restartkeys & anyset:
actions['restart'] = True
# Only need to update cache file
copykeys = set(['description'])
if copykeys & anyset:
actions['copyconf'] = True
# Clients have changed
if 'client' in removed:
actions.setdefault('unmount', [])
actions['unmount'] += [
Clients(elem) for elem in removed.elements('client')
]
if 'client' in added:
actions.setdefault('mount', [])
actions['mount'] += [
Clients(elem) for elem in added.elements('client')
]
if 'client' in changed:
for elem in changed.elements('client'):
actions.setdefault('unmount', []).append(Clients(elem.old))
actions.setdefault('mount', []).append(Clients(elem))
# Router has changed
if 'router' in removed:
actions.setdefault('stop', []).extend(
[Routers(elem) for elem in removed.elements('router')])
if 'router' in added:
actions.setdefault('start', []).extend(
[Routers(elem) for elem in added.elements('router')])
assert 'router' not in changed, 'Router change is not supported'
# Some targets have changed
for tgt in ['mgt', 'mdt', 'ost']:
if tgt in removed:
actions['writeconf'] = True
actions.setdefault('stop', []).extend(
[Target(tgt, elem) for elem in removed.elements(tgt)])
actions.setdefault('remove', []).extend(
[Target(tgt, elem) for elem in removed.elements(tgt)])
if tgt in added:
actions.setdefault('format', []).extend(
[Target(tgt, elem) for elem in added.elements(tgt)])
actions.setdefault('start', []).extend(
[Target(tgt, elem) for elem in added.elements(tgt)])
if tgt in changed:
for elem in changed.elements(tgt):
if set(['ha_node', 'network', 'node', 'dev']) & \
elem.chgkeys:
actions.setdefault('stop',
[]).append(Target(tgt, elem.old))
actions.setdefault('start',
[]).append(Target(tgt, elem))
if set(['ha_node', 'network', 'node']) & elem.chgkeys:
actions['writeconf'] = True
if set(['tag', 'group']) & elem.chgkeys:
actions['copyconf'] = True
if 'active' in elem.chgkeys:
actions['tune'] = True
if 'jdev' in elem.chgkeys:
raise ConfigException("'jdev' change is not supported")
# If some actions is required, we need to update config files.
if len(actions) > 0:
actions['copyconf'] = True
return actions