def getMultiPathDevice(dev_disk_by_path):
# input: /dev/disk/by-path/ip-10.100.10.3:3260-iscsi-iqn.2000-11.jp.co.valinux:00000006-lun-1
# output: /dev/mapper/mpath5
dev_path = ""
# iSCSI device path --> wwid
wwid = ""
command = "scsi_id -g -u /dev/%s" % os.path.realpath(dev_disk_by_path).split("/dev/")[1]
def condition():
return os.path.exists(dev_disk_by_path)
wwid = executecommand_retry(command, condition, SCSI_ID_RETRY_TIMES)
# wwid --> Multipath device path
dev_name = ""
for i in range(0, GETMULTIPATHDEVICE_RETRY_TIMES):
try:
executecommand("multipath")
dev_name = executecommand("dmsetup info --noheadings -c -u mpath-%s -o name" % (wwid))
return getDmDevPath(dev_name)
except:
time.sleep(GETMULTIPATHDEVICE_RETRY_INTERVAL)
logger.error("getMultiPathDevice: multipath -v3: %s", executecommand("multipath -v3"))
raise Exception, "retry over"
def undo(self):
assert len(self.components) == 1
name = getDextDevName(self.dext_ssvrid, self.lvolid)
path = getDmDevPath(name)
if os.path.exists(path):
dmsetup_remove(name)
self.path = None
def undo(self):
assert(len(self.components) > 0)
name = getSnapshotDevName(self.lvolid)
path = getDmDevPath(name)
if os.path.exists(path):
dmsetup_remove(name)
self.path = None
def do(self):
assert(len(self.components) > 0)
name = getSnapshotOriginDevName(self.lvolid)
path = getDmDevPath(name)
if not os.path.exists(path):
c = self.components[0]
command = "echo 0 %s snapshot-origin %s | dmsetup create %s" % \
(gtos(self.capacity), c.path, name)
execute_retry_not_path_exist(command, path, DMSETUP_RETRY_TIMES)
self.path = path
def do(self):
assert(len(self.components) > 0)
name = getSnapshotDevName(self.lvolid)
path = getDmDevPath(name)
if not os.path.exists(path):
origin_path = getSnapshotOriginOriginPath( \
self.snapshot_origin_lvolid)
origin_size = blockdev_getsize(origin_path)
c = self.components[0]
command = \
"echo 0 %s snapshot %s %s P %u | dmsetup create --readonly %s" \
% (origin_size, origin_path, c.path, SNAPSHOT_CHUNK_SIZE, name)
execute_retry_not_path_exist(command, path, DMSETUP_RETRY_TIMES)
self.path = path
def do(self):
assert len(self.components) == 1
c = self.components[0]
assert c.iscsi_ref != None
name = getDextDevName(self.dext_ssvrid, self.lvolid)
path = getDmDevPath(name)
if not os.path.exists(path):
command = "echo 0 %s linear %s %s | dmsetup create %s" % (
vbtos(self.capacity),
c.path,
vbtos(self.dext_offset),
name,
)
execute_retry_not_path_exist(command, path, DMSETUP_RETRY_TIMES)
self.path = path
os.close(c.iscsi_ref)
c.iscsi_ref = None
def dm_resume(lvolid):
name = getSnapshotOriginDevName(lvolid)
path = getDmDevPath(name)
if os.path.exists(path):
command = "dmsetup resume %s" % name
executecommand(command)