def get_device_name_for_instance(context, instance, bdms, device):
"""Validates (or generates) a device name for instance.
If device is not set, it will generate a unique device appropriate
for the instance. It uses the block device mapping table to find
valid device names. If the device name is valid but applicable to
a different backend (for example /dev/vdc is specified but the
backend uses /dev/xvdc), the device name will be converted to the
appropriate format.
"""
req_prefix = None
req_letter = None
if device:
try:
req_prefix, req_letter = block_device.match_device(device)
except (TypeError, AttributeError, ValueError):
raise exception.InvalidDevicePath(path=device)
mappings = block_device.instance_block_mapping(instance, bdms)
try:
prefix = block_device.match_device(mappings['root'])[0]
except (TypeError, AttributeError, ValueError):
raise exception.InvalidDevicePath(path=mappings['root'])
# NOTE(vish): remove this when xenapi is setting default_root_device
if driver.compute_driver_matches('xenapi.XenAPIDriver'):
prefix = '/dev/xvd'
if req_prefix != prefix:
LOG.debug(_("Using %(prefix)s instead of %(req_prefix)s"),
{'prefix': prefix, 'req_prefix': req_prefix})
used_letters = set()
for device_path in mappings.itervalues():
letter = block_device.strip_prefix(device_path)
# NOTE(vish): delete numbers in case we have something like
# /dev/sda1
letter = re.sub("\d+", "", letter)
used_letters.add(letter)
# NOTE(vish): remove this when xenapi is properly setting
# default_ephemeral_device and default_swap_device
if driver.compute_driver_matches('xenapi.XenAPIDriver'):
instance_type = flavors.extract_flavor(instance)
if instance_type['ephemeral_gb']:
used_letters.add('b')
if instance_type['swap']:
used_letters.add('c')
if not req_letter:
req_letter = _get_unused_letter(used_letters)
if req_letter in used_letters:
raise exception.DevicePathInUse(path=device)
device_name = prefix + req_letter
return device_name
def get_next_device_name(instance, device_name_list, root_device_name=None, device=None):
"""Validates (or generates) a device name for instance.
If device is not set, it will generate a unique device appropriate
for the instance. It uses the root_device_name (if provided) and
the list of used devices to find valid device names. If the device
name is valid but applicable to a different backend (for example
/dev/vdc is specified but the backend uses /dev/xvdc), the device
name will be converted to the appropriate format.
"""
req_prefix = None
req_letter = None
if device:
try:
req_prefix, req_letter = block_device.match_device(device)
except (TypeError, AttributeError, ValueError):
raise exception.InvalidDevicePath(path=device)
if not root_device_name:
root_device_name = block_device.DEFAULT_ROOT_DEV_NAME
try:
prefix = block_device.match_device(root_device_name)[0]
except (TypeError, AttributeError, ValueError):
raise exception.InvalidDevicePath(path=root_device_name)
# NOTE(vish): remove this when xenapi is setting default_root_device
if driver.compute_driver_matches("xenapi.XenAPIDriver"):
prefix = "/dev/xvd"
if req_prefix != prefix:
LOG.debug("Using %(prefix)s instead of %(req_prefix)s", {"prefix": prefix, "req_prefix": req_prefix})
used_letters = set()
for device_path in device_name_list:
letter = block_device.strip_prefix(device_path)
# NOTE(vish): delete numbers in case we have something like
# /dev/sda1
letter = re.sub("\d+", "", letter)
used_letters.add(letter)
# NOTE(vish): remove this when xenapi is properly setting
# default_ephemeral_device and default_swap_device
if driver.compute_driver_matches("xenapi.XenAPIDriver"):
flavor = flavors.extract_flavor(instance)
if flavor["ephemeral_gb"]:
used_letters.add("b")
if flavor["swap"]:
used_letters.add("c")
if not req_letter:
req_letter = _get_unused_letter(used_letters)
if req_letter in used_letters:
raise exception.DevicePathInUse(path=device)
return prefix + req_letter
def get_device_name_for_instance(context, instance, bdms, device):
"""Validates (or generates) a device name for instance.
If device is not set, it will generate a unique device appropriate
for the instance. It uses the block device mapping table to find
valid device names. If the device name is valid but applicable to
a different backend (for example /dev/vdc is specified but the
backend uses /dev/xvdc), the device name will be converted to the
appropriate format.
"""
req_prefix = None
req_letter = None
if device:
try:
req_prefix, req_letter = block_device.match_device(device)
except (TypeError, AttributeError, ValueError):
raise exception.InvalidDevicePath(path=device)
mappings = block_device.instance_block_mapping(instance, bdms)
try:
prefix = block_device.match_device(mappings['root'])[0]
except (TypeError, AttributeError, ValueError):
raise exception.InvalidDevicePath(path=mappings['root'])
# NOTE(vish): remove this when xenapi is setting default_root_device
if driver.compute_driver_matches('xenapi.XenAPIDriver'):
prefix = '/dev/xvd'
if req_prefix != prefix:
LOG.debug(_("Using %(prefix)s instead of %(req_prefix)s") % locals())
used_letters = set()
for device_path in mappings.itervalues():
letter = block_device.strip_prefix(device_path)
# NOTE(vish): delete numbers in case we have something like
# /dev/sda1
letter = re.sub("\d+", "", letter)
used_letters.add(letter)
# NOTE(vish): remove this when xenapi is properly setting
# default_ephemeral_device and default_swap_device
if driver.compute_driver_matches('xenapi.XenAPIDriver'):
instance_type = instance_types.extract_instance_type(instance)
if instance_type['ephemeral_gb']:
used_letters.add('b')
if instance_type['swap']:
used_letters.add('c')
if not req_letter:
req_letter = _get_unused_letter(used_letters)
if req_letter in used_letters:
raise exception.DevicePathInUse(path=device)
device_name = prefix + req_letter
return device_name
def get_device_name_for_instance(context, instance, device):
"""Validates (or generates) a device name for instance.
If device is not set, it will generate a unique device appropriate
for the instance. It uses the block device mapping table to find
valid device names. If the device name is valid but applicable to
a different backend (for example /dev/vdc is specified but the
backend uses /dev/xvdc), the device name will be converted to the
appropriate format.
"""
req_prefix = None
req_letters = None
if device:
try:
req_prefix, req_letters = block_device.match_device(device)
except (TypeError, AttributeError, ValueError):
raise exception.InvalidDevicePath(path=device)
bdms = db.block_device_mapping_get_all_by_instance(context, instance["uuid"])
mappings = block_device.instance_block_mapping(instance, bdms)
try:
prefix = block_device.match_device(mappings["root"])[0]
except (TypeError, AttributeError, ValueError):
raise exception.InvalidDevicePath(path=mappings["root"])
# NOTE(vish): remove this when xenapi is setting default_root_device
if driver.compute_driver_matches("xenapi.XenAPIDriver"):
prefix = "/dev/xvd"
if req_prefix != prefix:
LOG.debug(_("Using %(prefix)s instead of %(req_prefix)s") % locals())
letters_list = []
for _name, device in mappings.iteritems():
letter = block_device.strip_prefix(device)
# NOTE(vish): delete numbers in case we have something like
# /dev/sda1
letter = re.sub("\d+", "", letter)
letters_list.append(letter)
used_letters = set(letters_list)
# NOTE(vish): remove this when xenapi is properly setting
# default_ephemeral_device and default_swap_device
if driver.compute_driver_matches("xenapi.XenAPIDriver"):
instance_type_id = instance["instance_type_id"]
instance_type = instance_types.get_instance_type(instance_type_id)
if instance_type["ephemeral_gb"]:
used_letters.update("b")
if instance_type["swap"]:
used_letters.update("c")
if not req_letters:
req_letters = _get_unused_letters(used_letters)
if req_letters in used_letters:
raise exception.DevicePathInUse(path=device)
return prefix + req_letters
def instance_block_mapping(instance, bdms):
root_device_name = instance['root_device_name']
# NOTE(clayg): remove this when xenapi is setting default_root_device
if root_device_name is None:
if driver.compute_driver_matches('xenapi.XenAPIDriver'):
root_device_name = '/dev/xvda'
else:
return _DEFAULT_MAPPINGS
mappings = {}
mappings['ami'] = strip_dev(root_device_name)
mappings['root'] = root_device_name
default_ephemeral_device = instance.get('default_ephemeral_device')
if default_ephemeral_device:
mappings['ephemeral0'] = default_ephemeral_device
default_swap_device = instance.get('default_swap_device')
if default_swap_device:
mappings['swap'] = default_swap_device
ebs_devices = []
blanks = []
# 'ephemeralN', 'swap' and ebs
for bdm in bdms:
# ebs volume case
if bdm.destination_type == 'volume':
ebs_devices.append(bdm.device_name)
continue
if bdm.source_type == 'blank':
blanks.append(bdm)
# NOTE(yamahata): I'm not sure how ebs device should be numbered.
# Right now sort by device name for deterministic
# result.
if ebs_devices:
ebs_devices.sort()
for nebs, ebs in enumerate(ebs_devices):
mappings['ebs%d' % nebs] = ebs
swap = [bdm for bdm in blanks if bdm.guest_format == 'swap']
if swap:
mappings['swap'] = swap.pop().device_name
ephemerals = [bdm for bdm in blanks if bdm.guest_format != 'swap']
if ephemerals:
for num, eph in enumerate(ephemerals):
mappings['ephemeral%d' % num] = eph.device_name
# plus cdrom if root_device is hda
if 'hda' in mappings['root']:
mappings['cdrom'] = 'hdb'
return mappings
def instance_block_mapping(instance, bdms):
root_device_name = instance["root_device_name"]
# NOTE(clayg): remove this when xenapi is setting default_root_device
if root_device_name is None:
if driver.compute_driver_matches("xenapi.XenAPIDriver"):
root_device_name = "/dev/xvda"
else:
return _DEFAULT_MAPPINGS
mappings = {}
mappings["ami"] = strip_dev(root_device_name)
mappings["root"] = root_device_name
default_ephemeral_device = instance.get("default_ephemeral_device")
if default_ephemeral_device:
mappings["ephemeral0"] = default_ephemeral_device
default_swap_device = instance.get("default_swap_device")
if default_swap_device:
mappings["swap"] = default_swap_device
ebs_devices = []
blanks = []
# 'ephemeralN', 'swap' and ebs
for bdm in bdms:
# ebs volume case
if bdm.destination_type == "volume":
ebs_devices.append(bdm.device_name)
continue
if bdm.source_type == "blank":
blanks.append(bdm)
# NOTE(yamahata): I'm not sure how ebs device should be numbered.
# Right now sort by device name for deterministic
# result.
if ebs_devices:
ebs_devices.sort()
for nebs, ebs in enumerate(ebs_devices):
mappings["ebs%d" % nebs] = ebs
swap = [bdm for bdm in blanks if bdm.guest_format == "swap"]
if swap:
mappings["swap"] = swap.pop().device_name
ephemerals = [bdm for bdm in blanks if bdm.guest_format != "swap"]
if ephemerals:
for num, eph in enumerate(ephemerals):
mappings["ephemeral%d" % num] = eph.device_name
return mappings
def instance_block_mapping(instance, bdms):
root_device_name = instance["root_device_name"]
# NOTE(clayg): remove this when xenapi is setting default_root_device
if root_device_name is None:
if driver.compute_driver_matches("xenapi.XenAPIDriver"):
root_device_name = "/dev/xvda"
else:
return _DEFAULT_MAPPINGS
mappings = {}
mappings["ami"] = strip_dev(root_device_name)
mappings["root"] = root_device_name
default_ephemeral_device = instance.get("default_ephemeral_device")
if default_ephemeral_device:
mappings["ephemeral0"] = default_ephemeral_device
default_swap_device = instance.get("default_swap_device")
if default_swap_device:
mappings["swap"] = default_swap_device
ebs_devices = []
# 'ephemeralN', 'swap' and ebs
for bdm in bdms:
if bdm["no_device"]:
continue
# ebs volume case
if bdm["volume_id"] or bdm["snapshot_id"]:
ebs_devices.append(bdm["device_name"])
continue
virtual_name = bdm["virtual_name"]
if not virtual_name:
continue
if is_swap_or_ephemeral(virtual_name):
mappings[virtual_name] = bdm["device_name"]
# NOTE(yamahata): I'm not sure how ebs device should be numbered.
# Right now sort by device name for deterministic
# result.
if ebs_devices:
nebs = 0
ebs_devices.sort()
for ebs in ebs_devices:
mappings["ebs%d" % nebs] = ebs
nebs += 1
return mappings
def instance_block_mapping(instance, bdms):
root_device_name = instance['root_device_name']
# NOTE(clayg): remove this when xenapi is setting default_root_device
if root_device_name is None:
if driver.compute_driver_matches('xenapi.XenAPIDriver'):
root_device_name = '/dev/xvda'
else:
return _DEFAULT_MAPPINGS
mappings = {}
mappings['ami'] = strip_dev(root_device_name)
mappings['root'] = root_device_name
default_ephemeral_device = instance.get('default_ephemeral_device')
if default_ephemeral_device:
mappings['ephemeral0'] = default_ephemeral_device
default_swap_device = instance.get('default_swap_device')
if default_swap_device:
mappings['swap'] = default_swap_device
ebs_devices = []
# 'ephemeralN', 'swap' and ebs
for bdm in bdms:
if bdm['no_device']:
continue
# ebs volume case
if (bdm['volume_id'] or bdm['snapshot_id']):
ebs_devices.append(bdm['device_name'])
continue
virtual_name = bdm['virtual_name']
if not virtual_name:
continue
if is_swap_or_ephemeral(virtual_name):
mappings[virtual_name] = bdm['device_name']
# NOTE(yamahata): I'm not sure how ebs device should be numbered.
# Right now sort by device name for deterministic
# result.
if ebs_devices:
nebs = 0
ebs_devices.sort()
for ebs in ebs_devices:
mappings['ebs%d' % nebs] = ebs
nebs += 1
return mappings
def get_next_device_name(instance,
device_name_list,
root_device_name=None,
device=None):
"""Validates (or generates) a device name for instance.
If device is not set, it will generate a unique device appropriate
for the instance. It uses the root_device_name (if provided) and
the list of used devices to find valid device names. If the device
name is valid but applicable to a different backend (for example
/dev/vdc is specified but the backend uses /dev/xvdc), the device
name will be converted to the appropriate format.
"""
req_prefix = None
req_letter = None
if device:
try:
req_prefix, req_letter = block_device.match_device(device)
except (TypeError, AttributeError, ValueError):
raise exception.InvalidDevicePath(path=device)
if not root_device_name:
root_device_name = block_device.DEFAULT_ROOT_DEV_NAME
try:
prefix = block_device.match_device(root_device_name)[0]
except (TypeError, AttributeError, ValueError):
raise exception.InvalidDevicePath(path=root_device_name)
# NOTE(vish): remove this when xenapi is setting default_root_device
if driver.compute_driver_matches('xenapi.XenAPIDriver'):
prefix = '/dev/xvd'
if req_prefix != prefix:
LOG.debug(_("Using %(prefix)s instead of %(req_prefix)s"), {
'prefix': prefix,
'req_prefix': req_prefix
})
used_letters = set()
for device_path in device_name_list:
letter = block_device.strip_prefix(device_path)
# NOTE(vish): delete numbers in case we have something like
# /dev/sda1
letter = re.sub("\d+", "", letter)
used_letters.add(letter)
# NOTE(vish): remove this when xenapi is properly setting
# default_ephemeral_device and default_swap_device
if driver.compute_driver_matches('xenapi.XenAPIDriver'):
flavor = flavors.extract_flavor(instance)
if flavor['ephemeral_gb']:
used_letters.add('b')
if flavor['swap']:
used_letters.add('c')
if not req_letter:
req_letter = _get_unused_letter(used_letters)
if req_letter in used_letters:
raise exception.DevicePathInUse(path=device)
return prefix + req_letter
def get_next_device_name(instance, device_name_list,
root_device_name=None, device=None):
"""Validates (or generates) a device name for instance.
If device is not set, it will generate a unique device appropriate
for the instance. It uses the root_device_name (if provided) and
the list of used devices to find valid device names. If the device
name is valid but applicable to a different backend (for example
/dev/vdc is specified but the backend uses /dev/xvdc), the device
name will be converted to the appropriate format.
"""
is_xen = driver.compute_driver_matches('xenapi.XenAPIDriver')
req_prefix = None
req_letter = None
if device:
try:
req_prefix, req_letter = block_device.match_device(device)
except (TypeError, AttributeError, ValueError):
raise exception.InvalidDevicePath(path=device)
if not root_device_name:
root_device_name = block_device.DEFAULT_ROOT_DEV_NAME
try:
prefix = block_device.match_device(
block_device.prepend_dev(root_device_name))[0]
except (TypeError, AttributeError, ValueError):
raise exception.InvalidDevicePath(path=root_device_name)
# NOTE(vish): remove this when xenapi is setting default_root_device
if is_xen:
prefix = '/dev/xvd'
if req_prefix != prefix:
LOG.debug("Using %(prefix)s instead of %(req_prefix)s",
{'prefix': prefix, 'req_prefix': req_prefix})
used_letters = set()
for device_path in device_name_list:
letter = block_device.get_device_letter(device_path)
used_letters.add(letter)
# NOTE(vish): remove this when xenapi is properly setting
# default_ephemeral_device and default_swap_device
if is_xen:
flavor = instance.get_flavor()
if flavor.ephemeral_gb:
used_letters.add('b')
if flavor.swap:
used_letters.add('c')
if not req_letter:
req_letter = _get_unused_letter(used_letters)
if req_letter in used_letters:
raise exception.DevicePathInUse(path=device)
return prefix + req_letter
def get_next_device_name(instance, device_name_list,
root_device_name=None, device=None):
"""Validates (or generates) a device name for instance.
If device is not set, it will generate a unique device appropriate
for the instance. It uses the root_device_name (if provided) and
the list of used devices to find valid device names. If the device
name is valid but applicable to a different backend (for example
/dev/vdc is specified but the backend uses /dev/xvdc), the device
name will be converted to the appropriate format.
"""
is_xen = driver.compute_driver_matches('xenapi.XenAPIDriver')
is_libvirt = driver.compute_driver_matches('libvirt.LibvirtDriver')
req_prefix = None
req_letter = None
if device:
try:
req_prefix, req_letter = block_device.match_device(device)
except (TypeError, AttributeError, ValueError):
raise exception.InvalidDevicePath(path=device)
if not root_device_name:
root_device_name = block_device.DEFAULT_ROOT_DEV_NAME
try:
prefix = block_device.match_device(
block_device.prepend_dev(root_device_name))[0]
except (TypeError, AttributeError, ValueError):
raise exception.InvalidDevicePath(path=root_device_name)
# NOTE(vish): remove this when xenapi is setting default_root_device
if is_xen:
prefix = '/dev/xvd'
if is_libvirt:
prefix = req_prefix
if prefix is None:
prefix = '/dev/vd'
if req_prefix != prefix:
LOG.debug("Using %(prefix)s instead of %(req_prefix)s",
{'prefix': prefix, 'req_prefix': req_prefix})
used_letters = set()
for device_path in device_name_list:
letter = block_device.get_device_letter(device_path)
used_letters.add(letter)
# NOTE(vish): remove this when xenapi is properly setting
# default_ephemeral_device and default_swap_device
if is_xen:
flavor = instance.get_flavor()
if flavor.ephemeral_gb:
used_letters.add('b')
if flavor.swap:
used_letters.add('c')
if not req_letter:
req_letter = _get_unused_letter(used_letters)
if req_letter in used_letters:
raise exception.DevicePathInUse(path=device)
return prefix + req_letter
