def non_leaf_coalesce(node, parent, uri, cb):
node_vhd = node.vhd
parent_vhd = parent.vhd
log.debug("non_leaf_coalesce key={}, parent={}".format(node_vhd.id, parent_vhd.id))
opq = cb.volumeStartOperations(uri, 'w')
meta_path = cb.volumeMetadataGetPath(opq)
node_path = cb.volumeGetPath(opq, str(node_vhd.id))
log.debug("Running vhd-coalesce on {}".format(node_vhd.id))
VHDUtil.coalesce(GC, node_path)
db = VHDMetabase(meta_path)
with Lock(opq, 'gl', cb):
# reparent all of the children to this node's parent
children = db.get_children(node_vhd.id)
with db.write_context():
journal_entries = db.add_journal_entries(node_vhd.id, parent_vhd.id, children)
__reparent_children(opq, db, cb, journal_entries)
# remove key
log.debug("Destroy {}".format(node_vhd.id))
cb.volumeDestroy(opq, str(node_vhd.id))
with db.write_context():
db.delete_vhd(node_vhd.id)
cb.volumeUnlock(opq, node.lock)
cb.volumeUnlock(opq, parent.lock)
db.close()
cb.volumeStopOperations(opq)
def recover_journal(uri, cb):
opq = cb.volumeStartOperations(uri, 'w')
meta_path = cb.volumeMetadataGetPath(opq)
db = VHDMetabase(meta_path)
# Take the global SR lock, the coaleasce reparenting happens within this
# lock, so if we can get it and if there are any pending operations then
# a different process crashed or was aborted and we need to complete
# the outstanding operations
with Lock(opq, 'gl', cb):
# First get any leaf VDIs that need a tap refresh
refresh_entries = db.get_refresh_entries()
__refresh_leaf_vdis(opq, db, cb, refresh_entries)
# Now get the journalled reparent operations
journal_entries = db.get_journal_entries()
__reparent_children(opq, db, cb, journal_entries)
def find_best_non_leaf_coalesceable_2(uri, cb):
opq = cb.volumeStartOperations(uri, 'w')
meta_path = cb.volumeMetadataGetPath(opq)
db = VHDMetabase(meta_path)
ret = (None, None)
with Lock(opq, 'gl', cb):
nodes = find_non_leaf_coalesceable(db)
for node in nodes:
parent_lock = cb.volumeTryLock(opq, __create_vhd_lock_name(node.parent_id))
if parent_lock:
node_lock = cb.volumeTryLock(opq, __create_vhd_lock_name(node.id))
if node_lock:
parent = db.get_vhd_by_id(node.parent_id)
ret = (VhdLock(node, node_lock), VhdLock(parent, parent_lock))
break
else:
cb.volumeUnlock(opq, parent_lock)
db.close()
cb.volumeStopOperations(opq)
return ret
def remove_garbage_vhds(uri, cb):
opq = cb.volumeStartOperations(uri, 'w')
meta_path = cb.volumeMetadataGetPath(opq)
db = VHDMetabase(meta_path)
garbage = db.get_garbage_vhds()
if len(garbage) > 0:
for vhd in garbage:
cb.volumeDestroy(opq, str(vhd.id))
with db.write_context():
db.delete_vhd(vhd.id)
db.close()
cb.volumeStopOperations(opq)