def _destroy_cache(self):
dm = Dmsetup(root_helper=self.root_helper)
cache_name = self._cache_name
cache_table = dm.get_table(cache_name)
ssd_dev = self.flashcache.get_ssd_dev(cache_table)
dm.remove_table(cache_name)
self.flashcache.destroy(ssd_dev)
def rm_disk(self, disk_path):
if os.path.islink(disk_path):
disk_path = os.path.realpath(disk_path)
hdd_group = FcgLinearTable(self.group_name, root_helper=self.root_helper)
assert hdd_group.existed, "Group %s dose NOT exist..." % self.group_name
disk = hdd_group.find_disk(disk_path)
dm = Dmsetup(root_helper=self.root_helper)
cached_name = self._cached_disk_name(disk.dev)
dm.remove_table(cached_name)
hdd_group.remove_disk(disk)
def add_disk(self, disk_path):
if os.path.islink(disk_path):
disk_path = os.path.realpath(disk_path)
disk = Disk.from_path(disk_path, root_helper=self.root_helper)
hdd_group = LinearTable(self.group_name, root_helper=self.root_helper)
assert hdd_group.existed, "Group %s dose NOT exist..." % self.group_name
hdd_group.insert_disk(disk)
dm = Dmsetup(root_helper=self.root_helper)
cache_dev = dm.mapdev_prefix + self._cache_name()
cached_table = '0 %d linear %s %d' % (disk.size, cache_dev, disk.start)
cached_disk_name = self._cached_disk_name(disk.dev)
dm.create_table(cached_disk_name, cached_table)
return dm.mapdev_prefix + cached_disk_name
def delete_group(self):
hdd_group = LinearTable(self.group_name, root_helper=self.root_helper)
assert hdd_group.existed, "Group %s dose NOT exist..." % self.group_name
dm = Dmsetup(root_helper=self.root_helper)
#TODO: check for wether busy
for disk in hdd_group.disks:
if disk.mapper != 'error':
cached_name = self._cached_disk_name(disk.dev)
dm.remove_table(cached_name)
fc = Flashcache(root_helper=self.root_helper)
cache_name = self._cache_name()
cache_table = dm.get_table(cache_name)
ssd_dev = fc.get_ssd_dev(cache_table)
dm.remove_table(cache_name)
fc.destroy(ssd_dev)
dm.remove_table(self._ssd_name())
dm.remove_table(self.group_name)
def rm_disk(self, disk_path):
if os.path.islink(disk_path):
disk_path = os.path.realpath(disk_path)
hdd_group = LinearTable(self.group_name, root_helper=self.root_helper)
assert hdd_group.existed, "Group %s dose NOT exist..." % self.group_name
disk = hdd_group.find_disk(disk_path)
dm = Dmsetup(root_helper=self.root_helper)
cached_name = self._cached_disk_name(disk.dev)
cache_name = self._cache_name()
cache_dev = dm.mapdev_prefix + cache_name
cache_table = dm.get_table(cache_name)
fc = Flashcache(root_helper=self.root_helper)
block_size = fc.get_block_size(cache_table)
start_blk, offset_blk = utils.sector_offset2block_offset(disk.start, disk.size, block_size)
fc.invalid(cache_dev, start_blk, offset_blk)
dm.remove_table(cached_name)
hdd_group.remove_disk(disk)
def is_valid(self):
dm = Dmsetup(root_helper=self.root_helper)
existences = map(dm.is_exist,
[self.group_name, self._ssd_name, self._cache_name])
if reduce(lambda x, y: x and y, existences):
return True
else:
if reduce(lambda x, y: x or y, existences):
raise Exception("Cache group has been broken!")
else:
return False
class Table(object):
def __init__(self, name, method, root_helper=''):
self.root_helper = root_helper
self.name = name
self.method = method
self.path = ''
self.dm = Dmsetup(root_helper=root_helper)
self.block = Blockdev(root_helper=root_helper)
if self.dm.is_exist(self.name):
self.existed = True
else:
self.existed = False
def __str__(self):
return NotImplementedError()
def _parse_table(self):
return NotImplementedError()
def create_table(self):
if self.existed:
raise Exception("%s has been existed!" % self.name)
else:
self.path = self.dm.create_table(self.name, str(self))
self.existed = True
def remove_table(self):
if not self.existed:
raise Exception("%s does NOT exist!" % self.name)
else:
self.dm.remove_table(self.name)
def reload_table(self):
self.dm.reload_table(self.name, str(self))
def create_group(self, ssds, block_size, pattern):
#TODO: roll back if failed
group_name = self.group_name
dm = Dmsetup()
hdd_size = '1P'
hdd_sectors = utils.bytes2sectors(hdd_size)
hdd = Disk.from_error(hdd_sectors)
hdd_group = LinearTable.from_disks(group_name, [hdd])
ssd_name = self._ssd_name()
ssd_group = LinearTable.from_disks(ssd_name, ssds)
fc = Flashcache()
cache_name = self._cache_name()
cache_Dev = fc.create(cache_name, ssd_group.path, hdd_group.path,
block_size, pattern)
def delete_group(self):
if not self.hdd_group:
self.hdd_group = DmLinearTable(self.group_name,
root_helper=self.root_helper)
assert self.hdd_group.existed, "Group %s dose NOT exist..." % self.group_name
dm = Dmsetup(root_helper=self.root_helper)
# TODO: check for wether busy
for disk in self.hdd_group.disks:
if disk.mapper != 'error':
cached_name = self._cached_disk_name(disk.dev)
dm.remove_table(cached_name)
self._destroy_cache()
time.sleep(0.1)
dm.remove_table(self._ssd_name)
dm.remove_table(self.group_name)
def delete_group(self):
if not self.hdd_group:
self.hdd_group = DmLinearTable(self.group_name, root_helper=self.root_helper)
assert self.hdd_group.existed, "Group %s dose NOT exist..." % self.group_name
dm = Dmsetup(root_helper=self.root_helper)
# TODO: check for wether busy
for disk in self.hdd_group.disks:
if disk.mapper != 'error':
cached_name = self._cached_disk_name(disk.dev)
dm.remove_table(cached_name)
self._destroy_cache()
time.sleep(0.1)
dm.remove_table(self._ssd_name)
dm.remove_table(self.group_name)
def delete_group(self):
hdd_group = LinearTable(self.group_name)
assert hdd_group.existed, "Group %s dose NOT exist..." % self.group_name
dm = Dmsetup()
#TODO: check for wether busy
for disk in hdd_group.disks:
if disk.mapper != 'error':
cached_name = self._cached_disk_name(disk.dev)
dm.remove_table(cached_name)
fc = Flashcache()
cache_name = self._cache_name()
cache_table = dm.get_table(cache_name)
ssd_dev = fc.get_ssd_dev(cache_table)
dm.remove_table(cache_name)
fc.destroy(ssd_dev)
dm.remove_table(self._ssd_name())
dm.remove_table(self.group_name)
def _exists(self, fcg_table, disk):
dm = Dmsetup(root_helper=self.root_helper)
cached_disk_name = self._cached_disk_name(disk.dev)
return fcg_table.exists(disk) and dm.is_exist(cached_disk_name)
def _exists(self, fcg_table, disk):
dm = Dmsetup(root_helper=self.root_helper)
cached_disk_name = self._cached_disk_name(disk.dev)
return fcg_table.exists(disk) and dm.is_exist(cached_disk_name)
