/usr/share/pyshared/rtslib/loop.py is in python-rtslib 2.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Implements the RTS SAS loopback classes.
This file is part of RTSLib Community Edition.
Copyright (c) 2011 by RisingTide Systems LLC
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, version 3 (AGPLv3).
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
'''
import re
import os
import glob
import uuid
import shutil
# rtslib modules
from root import RTSRoot
from node import CFSNode
from utils import RTSLibError, RTSLibBrokenLink
from utils import generate_wwn, fwrite, fread
class LUN(CFSNode):
'''
This is an interface to RTS Target LUNs in configFS.
A LUN is identified by its parent Nexus and LUN index.
'''
# LUN private stuff
def __init__(self, parent_nexus, lun, storage_object=None, alias=None):
'''
A LUN object can be instanciated in two ways:
- B{Creation mode}: If I{storage_object} is specified, the
underlying configFS object will be created with that parameter.
No LUN with the same I{lun} index can pre-exist in the parent
Nexus in that mode, or instanciation will fail.
- B{Lookup mode}: If I{storage_object} is not set, then the LUN
will be bound to the existing configFS LUN object of the parent
Nexus having the specified I{lun} index. The underlying configFS
object must already exist in that mode.
@param parent_nexus: The parent Nexus object.
@type parent_nexus: Nexus
@param lun: The LUN index.
@type lun: 0-255
@param storage_object: The storage object to be exported as a LUN.
@type storage_object: StorageObject subclass
@param alias: An optional parameter to manually specify the LUN alias.
You probably do not need this.
@type alias: string
@return: A LUN object.
'''
super(LUN, self).__init__()
if isinstance(parent_nexus, Nexus):
self._parent_nexus = parent_nexus
else:
raise RTSLibError("Invalid parent Nexus.")
try:
lun = int(lun)
except ValueError:
raise RTSLibError("Invalid LUN index: %s" % str(lun))
else:
if lun > 255 or lun < 0:
raise RTSLibError("Invalid LUN index, it must be "
+ "between 0 and 255: %d" % lun)
self._lun = lun
self._path = "%s/lun/lun_%d" % (self.parent_nexus.path, self.lun)
if storage_object is None and alias is not None:
raise RTSLibError("The alias parameter has no meaning "
+ "without the storage_object parameter.")
if storage_object is not None:
self._create_in_cfs_ine('create')
try:
self._configure(storage_object, alias)
except:
self.delete()
raise
else:
self._create_in_cfs_ine('lookup')
def __str__(self):
try:
storage_object = self.storage_object
except RTSLibBrokenLink:
desc = "[BROKEN STORAGE LINK]"
else:
backstore = storage_object.backstore
soname = storage_object.name
if backstore.plugin.startswith("rd"):
path = "ramdisk"
else:
path = storage_object.udev_path
desc = "-> %s%d '%s' (%s)" \
% (backstore.plugin, backstore.index, soname, path)
return "LUN %d %s" % (self.lun, desc)
def _create_in_cfs_ine(self, mode):
super(LUN, self)._create_in_cfs_ine(mode)
def _configure(self, storage_object, alias):
self._check_self()
if alias is None:
alias = str(uuid.uuid4())[-10:]
else:
alias = str(alias).strip()
if '/' in alias:
raise RTSLibError("Invalid alias: %s", alias)
destination = "%s/%s" % (self.path, alias)
from tcm import StorageObject
if isinstance(storage_object, StorageObject):
if storage_object.exists:
source = storage_object.path
else:
raise RTSLibError("The storage_object does not exist "
+ "in configFS.")
else:
raise RTSLibError("Invalid storage object.")
os.symlink(source, destination)
def _get_alias(self):
self._check_self()
alias = None
for path in os.listdir(self.path):
if os.path.islink("%s/%s" % (self.path, path)):
alias = os.path.basename(path)
break
if alias is None:
raise RTSLibBrokenLink("Broken LUN in configFS, no " \
+ "storage object attached.")
else:
return alias
def _get_storage_object(self):
self._check_self()
alias_path = None
for path in os.listdir(self.path):
if os.path.islink("%s/%s" % (self.path, path)):
alias_path = os.path.realpath("%s/%s" % (self.path, path))
break
if alias_path is None:
raise RTSLibBrokenLink("Broken LUN in configFS, no " \
+ "storage object attached.")
rtsroot = RTSRoot()
for storage_object in rtsroot.storage_objects:
if storage_object.path == alias_path:
return storage_object
raise RTSLibBrokenLink("Broken storage object link in LUN.")
def _get_parent_nexus(self):
return self._parent_nexus
def _get_lun(self):
return self._lun
def _get_alua_metadata_path(self):
return "%s/lun_%d" % (self.parent_nexus.alua_metadata_path, self.lun)
# LUN public stuff
def delete(self):
'''
If the underlying configFS object does not exists, this method does
nothing. If the underlying configFS object exists, this method attempts
to delete it.
'''
self._check_self()
try:
link = self.alias
except RTSLibBrokenLink:
pass
else:
if os.path.islink("%s/%s" % (self.path, link)):
os.unlink("%s/%s" % (self.path, link))
super(LUN, self).delete()
if os.path.isdir(self.alua_metadata_path):
shutil.rmtree(self.alua_metadata_path)
alua_metadata_path = property(_get_alua_metadata_path,
doc="Get the ALUA metadata directory path for the LUN.")
parent_nexus = property(_get_parent_nexus,
doc="Get the parent Nexus object.")
lun = property(_get_lun,
doc="Get the LUN index as an int.")
storage_object = property(_get_storage_object,
doc="Get the storage object attached to the LUN.")
alias = property(_get_alias,
doc="Get the LUN alias.")
class Nexus(CFSNode):
'''
This is a an interface to Target Portal Groups in configFS.
A Nexus is identified by its parent Target object and its nexus Tag.
To a Nexus object is attached a list of NetworkPortals.
'''
# Nexus private stuff
def __init__(self, parent_target, tag, mode='any'):
'''
@param parent_target: The parent Target object of the Nexus.
@type parent_target: Target
@param tag: The Nexus Tag (TPGT).
@type tag: int > 0
@param mode:An optionnal string containing the object creation mode:
- I{'any'} means the configFS object will be either looked up or
created.
- I{'lookup'} means the object MUST already exist configFS.
- I{'create'} means the object must NOT already exist in configFS.
@type mode:string
@return: A Nexus object.
'''
super(Nexus, self).__init__()
try:
self._tag = int(tag)
except ValueError:
raise RTSLibError("Invalid Tag.")
if tag < 1:
raise RTSLibError("Invalig Tag, it must be >0.")
if isinstance(parent_target, Target):
self._parent_target = parent_target
else:
raise RTSLibError("Invalid parent Target.")
self._path = "%s/tpgt_%d" % (self.parent_target.path, self.tag)
self._create_in_cfs_ine(mode)
def __str__(self):
try:
initiator = self.initiator
except RTSLibError:
initiator = "[BROKEN]"
return "Nexus %d / initiator %s" % (self.tag, initiator)
def _get_initiator(self):
nexus_path = self._path + "/nexus"
if os.path.isfile(nexus_path):
try:
initiator = fread(nexus_path)
except IOError, msg:
raise RTSLibError("Cannot read Nexus initiator address "
+ "(>=4.0 style, %s): %s."
% (nexus_path, msg))
else:
try:
initiator = os.listdir(nexus_path)[0]
except IOError, msg:
raise RTSLibError("Cannot read Nexus initiator address "
+ "(<4.0 style, %s): %s."
% (nexus_path, msg))
return initiator.strip()
def _get_tag(self):
return self._tag
def _get_parent_target(self):
return self._parent_target
def _create_in_cfs_ine(self, mode):
super(Nexus, self)._create_in_cfs_ine(mode)
if not os.path.isdir(self.alua_metadata_path):
os.makedirs(self.alua_metadata_path)
if self._fresh:
initiator = generate_wwn('naa')
nexus_path = self._path + "/nexus"
if os.path.isfile(nexus_path):
try:
fwrite(nexus_path, initiator)
except IOError, msg:
raise RTSLibError("Cannot create Nexus initiator "
+ "(>=4.0 style, %s): %s."
% (nexus_path, msg))
else:
try:
os.makedirs(nexus_path + "/" + initiator)
except IOError, msg:
raise RTSLibError("Cannot create Nexus initiator."
+ "(<4.0 style, %s): %s."
% (nexus_path, msg))
def _list_luns(self):
self._check_self()
luns = []
lun_dirs = [os.path.basename(path)
for path in os.listdir("%s/lun" % self.path)]
for lun_dir in lun_dirs:
lun = lun_dir.split('_')[1]
lun = int(lun)
luns.append(LUN(self, lun))
return luns
def _control(self, command):
self._check_self()
path = "%s/control" % self.path
fwrite(path, "%s\n" % str(command))
def _get_alua_metadata_path(self):
return "%s/%s+%d" \
% (self.alua_metadata_dir,
self.parent_target.naa, self.tag)
# Nexus public stuff
def delete(self):
'''
Recursively deletes a Nexus object.
This will delete all attached LUN, and then the Nexus itself.
'''
self._check_self()
for lun in self.luns:
lun.delete()
# TODO: check that ALUA MD removal works while removing Nexus
if os.path.isdir(self.alua_metadata_path):
shutil.rmtree(self.alua_metadata_path)
nexus_path = self._path + "/nexus"
if os.path.isfile(nexus_path):
try:
fwrite(nexus_path, "NULL")
except IOError, msg:
raise RTSLibError("Cannot delete Nexus initiator "
+ "(>=4.0 style, %s): %s."
% (nexus_path, msg))
else:
try:
os.rmdir(nexus_path + "/" + self.initiator)
except IOError, msg:
raise RTSLibError("Cannot delete Nexus initiator."
+ "(<4.0 style, %s): %s."
% (nexus_path, msg))
super(Nexus, self).delete()
def lun(self, lun, storage_object=None, alias=None):
'''
Same as LUN() but without specifying the parent_nexus.
'''
self._check_self()
return LUN(self, lun=lun, storage_object=storage_object, alias=alias)
alua_metadata_path = property(_get_alua_metadata_path,
doc="Get the ALUA metadata directory path " \
+ "for the Nexus.")
tag = property(_get_tag,
doc="Get the Nexus Tag as an int.")
initiator = property(_get_initiator,
doc="Get the Nexus initiator address as a string.")
parent_target = property(_get_parent_target,
doc="Get the parent Target object to which the " \
+ "Nexus is attached.")
luns = property(_list_luns,
doc="Get the list of LUN objects currently attached " \
+ "to the Nexus.")
class Target(CFSNode):
'''
This is an interface to loopback SAS Targets in configFS.
A Target is identified by its naa SAS address.
To a Target is attached a list of Nexus objects.
'''
# Target private stuff
def __init__(self, naa=None, mode='any'):
'''
@param naa: The optionnal Target's address.
If no address or an empty address is specified, one will be
generated for you.
@type naa: string
@param mode:An optionnal string containing the object creation mode:
- I{'any'} means the configFS object will be either looked up
or created.
- I{'lookup'} means the object MUST already exist configFS.
- I{'create'} means the object must NOT already exist in configFS.
@type mode:string
@return: A Target object.
'''
super(Target, self).__init__()
if naa is None:
naa = generate_wwn('naa')
else:
naa = str(naa).lower().strip()
self._naa = naa
self._path = "%s/loopback/%s" % (self.configfs_dir, self._naa)
if not self:
if not re.match(
"naa\.[0-9]+", naa) \
or re.search(' ', naa) \
or re.search('_', naa):
raise RTSLibError("Invalid naa: %s"
% naa)
self._create_in_cfs_ine(mode)
def __str__(self):
return "SAS loopback %s" % self.naa
def _list_nexuses(self):
self._check_self()
nexuses = []
nexus_dirs = glob.glob("%s/tpgt*" % self.path)
for nexus_dir in nexus_dirs:
tag = os.path.basename(nexus_dir).split('_')[1]
tag = int(tag)
nexuses.append(Nexus(self, tag, 'lookup'))
return nexuses
def _get_naa(self):
return self._naa
# Target public stuff
def delete(self):
'''
Recursively deletes a Target object.
This will delete all attached Nexus objects and then the Target itself.
'''
self._check_self()
for nexus in self.nexuses:
nexus.delete()
super(Target, self).delete()
def nexus(self, tag, mode='any'):
'''
Same as Nexus() but without the parent_target parameter.
'''
self._check_self()
return Nexus(self, tag=tag, mode=mode)
naa = property(_get_naa,
doc="Get the naa of the Target object as a string.")
nexuses = property(_list_nexuses,
doc="Get the list of Nexus objects currently "
+ "attached to the Target.")
def _test():
import doctest
doctest.testmod()
if __name__ == "__main__":
_test()
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