def save(volpath, kv_dict):
"""
Save the dictionary to side car.
"""
meta_file = lib.DiskLib_SidecarMakeFileName(volpath.encode(),
DVOL_KEY.encode())
kv_str = json.dumps(kv_dict)
retry_count = 0
vol_name = vmdk_utils.get_volname_from_vmdk_path(volpath)
while True:
try:
with open(meta_file, "w") as fh:
fh.write(align_str(kv_str, KV_ALIGN))
break
except IOError as open_error:
# This is a workaround to the timing/locking with metadata files issue #626
if open_error.errno == errno.EBUSY and retry_count <= vmdk_utils.VMDK_RETRY_COUNT:
logging.warning("Meta file %s busy for save(), retrying...",
meta_file)
vmdk_utils.log_volume_lsof(vol_name)
retry_count += 1
time.sleep(vmdk_utils.VMDK_RETRY_SLEEP)
else:
logging.exception("Failed to save meta-data for %s", volpath)
return False
return True
def load(volpath):
"""
Load and return dictionary from the sidecar
"""
meta_file = lib.DiskLib_SidecarMakeFileName(volpath.encode(),
DVOL_KEY.encode())
retry_count = 0
vol_name = vmdk_utils.get_volname_from_vmdk_path(volpath)
while True:
try:
with open(meta_file, "r") as fh:
kv_str = fh.read()
break
except IOError as open_error:
# This is a workaround to the timing/locking with metadata files issue #626
if open_error.errno == errno.EBUSY and retry_count <= vmdk_utils.VMDK_RETRY_COUNT:
logging.warning("Meta file %s busy for load(), retrying...", meta_file)
vmdk_utils.log_volume_lsof(vol_name)
retry_count += 1
time.sleep(vmdk_utils.VMDK_RETRY_SLEEP)
else:
logging.exception("Failed to access %s", meta_file)
return None
try:
return json.loads(kv_str)
except ValueError:
logging.exception("load:Failed to decode meta-data for %s", volpath)
return None
def save(volpath, kv_dict, key=None, value=None):
"""
Save the dictionary to side car.
"""
vol_type = get_vol_type(volpath)
if not vol_type:
logging.warning("KV delete - could not determine type of volume %s", volpath)
return False
if vol_type == c_uint32(KV_VOL_VIRTUAL).value:
meta_file = lib.DiskLib_SidecarMakeFileName(volpath.encode(),
DVOL_KEY.encode())
else:
meta_file = get_kv_filename(volpath)
if not meta_file:
return False
kv_str = json.dumps(kv_dict)
retry_count = 0
vol_name = vmdk_utils.get_volname_from_vmdk_path(volpath)
while True:
try:
if key:
with open(meta_file, "r") as rfh:
kv_val = rfh.read()
try:
kv_match = json.loads(kv_val)
except ValueError:
logging.exception("load:Failed to decode meta-data for %s", volpath)
return False
if key in kv_match and kv_match[key] != value:
return False
with open(meta_file, "w") as fh:
fh.write(align_str(kv_str, KV_ALIGN))
break
except IOError as open_error:
# This is a workaround to the timing/locking with metadata files issue #626
if open_error.errno == errno.EBUSY and retry_count <= vmdk_utils.VMDK_RETRY_COUNT:
logging.warning("Meta file %s busy for save(), retrying...", meta_file)
vmdk_utils.log_volume_lsof(vol_name)
retry_count += 1
time.sleep(vmdk_utils.VMDK_RETRY_SLEEP)
else:
logging.exception("Failed to save meta-data for %s", volpath)
return False
return True
def save(volpath, kv_dict, key=None, value=None):
"""
Save the dictionary to side car.
"""
meta_file = lib.DiskLib_SidecarMakeFileName(volpath.encode(),
DVOL_KEY.encode())
kv_str = json.dumps(kv_dict)
retry_count = 0
vol_name = vmdk_utils.get_volname_from_vmdk_path(volpath)
while True:
try:
if key:
with open(meta_file, "r") as rfh:
kv_val = rfh.read()
try:
kv_match = json.loads(kv_val)
except ValueError:
logging.exception("load:Failed to decode meta-data for %s", volpath)
return False
if key in kv_match and kv_match[key] != value:
return False
with open(meta_file, "w") as fh:
fh.write(align_str(kv_str, KV_ALIGN))
break
except IOError as open_error:
# This is a workaround to the timing/locking with metadata files issue #626
if open_error.errno == errno.EBUSY and retry_count <= vmdk_utils.VMDK_RETRY_COUNT:
logging.warning("Meta file %s busy for save(), retrying...", meta_file)
vmdk_utils.log_volume_lsof(vol_name)
retry_count += 1
time.sleep(vmdk_utils.VMDK_RETRY_SLEEP)
else:
logging.exception("Failed to save meta-data for %s", volpath)
return False
return True
