The cinder.volume.utils Module

The cinder.volume.utils Module

Volume-related Utilities and helpers.

append_host(host, pool)

Encode pool into host info.


Check cinder db for already managed volume.

Parameters:vol_id – volume id parameter
Returns:bool – return True, if db entry with specified volume id exists, otherwise return False
check_for_odirect_support(src, dest, flag='oflag=direct')
clear_volume(volume_size, volume_path, volume_clear=None, volume_clear_size=None, volume_clear_ionice=None, throttle=None)

Unprovision old volumes to prevent data leaking between users.

clone_encryption_key(context, key_manager, encryption_key_id)

Convert config file replication string to a dict.

The only supported form is as follows: “{‘key-1’=’val-1’ ‘key-2’=’val-2’…}”

Parameters:config_string – Properly formatted string to convert to dict.
Response:dict of string values
copy_volume(src, dest, size_in_m, blocksize, sync=False, execute=<function execute>, ionice=None, throttle=None, sparse=False)

Copy data from the source volume to the destination volume.

The parameters ‘src’ and ‘dest’ are both typically of type str, which represents the path to each volume on the filesystem. Connectors can optionally return a volume handle of type RawIOBase for volumes that are not available on the local filesystem for open/close operations.

If either ‘src’ or ‘dest’ are not of type str, then they are assumed to be of type RawIOBase or any derivative that supports file operations such as read and write. In this case, the handles are treated as file handles instead of file paths and, at present moment, throttling is unavailable.

create_encryption_key(context, key_manager, volume_type_id)
delete_encryption_key(context, key_manager, encryption_key_id)
extract_host(host, level='backend', default_pool_name=False)

Extract Host, Backend or Pool information from host string.

  • host – String for host, which could include host@backend#pool info
  • level – Indicate which level of information should be extracted from host string. Level can be ‘host’, ‘backend’ or ‘pool’, default value is ‘backend’
  • default_pool_name – this flag specify what to do if level == ‘pool’ and there is no ‘pool’ info encoded in host string. default_pool_name=True will return DEFAULT_POOL_NAME, otherwise we return None. Default value of this parameter is False.

expected information, string or None



For example:

host = ‘HostA@BackendB#PoolC’ ret = extract_host(host, ‘host’) # ret is ‘HostA’ ret = extract_host(host, ‘backend’) # ret is ‘HostA@BackendB’ ret = extract_host(host, ‘pool’) # ret is ‘PoolC’

host = ‘HostX@BackendY’ ret = extract_host(host, ‘pool’) # ret is None ret = extract_host(host, ‘pool’, True) # ret is ‘_pool0’


Return a snapshot’s ID from its name on the backend.

generate_password(length=16, symbolgroups=('23456789', 'ABCDEFGHJKLMNPQRSTUVWXYZ', 'abcdefghijkmnopqrstuvwxyz'))

Generate a random password from the supplied symbol groups.

At least one symbol from each group will be included. Unpredictable results if length is less than the number of symbol groups.

Believed to be reasonably secure (with a reasonable password length!)

generate_username(length=20, symbolgroups=('23456789', 'ABCDEFGHJKLMNPQRSTUVWXYZ', 'abcdefghijkmnopqrstuvwxyz'))
get_max_over_subscription_ratio(str_value, supports_auto=False)

Get the max_over_subscription_ratio from a string

As some drivers need to do some calculations with the value and we are now receiving a string value in the conf, this converts the value to float when appropriate.

  • str_value – Configuration object
  • supports_auto – Tell if the calling driver supports auto MOSR.
  • drv_msg – Error message from the caller

value of mosr

hosts_are_equivalent(host_1, host_2)
is_group_a_type(group, key)
matching_backend_name(src_volume_type, volume_type)
notify_about_backup_usage(*args, **kwargs)
notify_about_capacity_usage(*args, **kwargs)
notify_about_cgsnapshot_usage(*args, **kwargs)
notify_about_consistencygroup_usage(*args, **kwargs)
notify_about_group_snapshot_usage(*args, **kwargs)
notify_about_group_usage(*args, **kwargs)
notify_about_replication_error(*args, **kwargs)
notify_about_replication_usage(*args, **kwargs)
notify_about_snapshot_usage(*args, **kwargs)
notify_about_volume_usage(*args, **kwargs)
paginate_entries_list(entries, marker, limit, offset, sort_keys, sort_dirs)

Paginate a list of entries.

Parameters:entries – list of dictionaries
Marker:The last element previously returned
Limit:The maximum number of items to return
Offset:The number of items to skip from the marker or from the first element.
Sort_keys:A list of keys in the dictionaries to sort by
Sort_dirs:A list of sort directions, where each is either ‘asc’ or ‘dec’

Read the /proc/mounts file.

It’s a dummy function but it eases the writing of unit tests as mocking __builtin__open() for a specific file only is not trivial.

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