def read_metadata(path_or_fd):
"""
Helper function to read the serialized metadata from a File/Directory.
:param path_or_fd: File/Directory path or fd from which to read metadata.
:returns: dictionary of metadata
"""
metastr = ''
key = 0
try:
while True:
metastr += do_getxattr(path_or_fd,
'%s%s' % (METADATA_KEY, (key or '')))
key += 1
if len(metastr) < MAX_XATTR_SIZE:
# Prevent further getxattr calls
break
except IOError as err:
if err.errno != errno.ENODATA:
raise
if not metastr:
return {}
metadata = deserialize_metadata(metastr)
if not metadata:
# Empty dict i.e deserializing of metadata has failed, probably
# because it is invalid or incomplete or corrupt
clean_metadata(path_or_fd)
assert isinstance(metadata, dict)
return metadata
def read_metadata(path_or_fd):
"""
Helper function to read the serialized metadata from a File/Directory.
:param path_or_fd: File/Directory path or fd from which to read metadata.
:returns: dictionary of metadata
"""
metastr = ''
key = 0
try:
while True:
metastr += do_getxattr(path_or_fd, '%s%s' %
(METADATA_KEY, (key or '')))
key += 1
if len(metastr) < MAX_XATTR_SIZE:
# Prevent further getxattr calls
break
except IOError as err:
if err.errno != errno.ENODATA:
raise
if not metastr:
return {}
metadata = deserialize_metadata(metastr)
if not metadata:
# Empty dict i.e deserializing of metadata has failed, probably
# because it is invalid or incomplete or corrupt
clean_metadata(path_or_fd)
assert isinstance(metadata, dict)
return metadata
def read_metadata(path_or_fd):
"""
Helper function to read the pickled metadata from a File/Directory.
:param path_or_fd: File/Directory path or fd from which to read metadata.
:returns: dictionary of metadata
"""
metadata = None
metadata_s = ''
key = 0
while metadata is None:
try:
metadata_s += do_getxattr(path_or_fd,
'%s%s' % (METADATA_KEY, (key or '')))
except IOError as err:
if err.errno == errno.ENODATA:
if key > 0:
# No errors reading the xattr keys, but since we have not
# been able to find enough chunks to get a successful
# unpickle operation, we consider the metadata lost, and
# drop the existing data so that the internal state can be
# recreated.
clean_metadata(path_or_fd)
# We either could not find any metadata key, or we could find
# some keys, but were not successful in performing the
# unpickling (missing keys perhaps)? Either way, just report
# to the caller we have no metadata.
metadata = {}
else:
# Note that we don't touch the keys on errors fetching the
# data since it could be a transient state.
raise GlusterFileSystemIOError(
err.errno, 'getxattr("%s", %s)' % (path_or_fd, key))
else:
try:
# If this key provides all or the remaining part of the pickle
# data, we don't need to keep searching for more keys. This
# means if we only need to store data in N xattr key/value
# pair, we only need to invoke xattr get N times. With large
# keys sizes we are shooting for N = 1.
metadata = pickle.loads(metadata_s)
assert isinstance(metadata, dict)
except EOFError, pickle.UnpicklingError:
# We still are not able recognize this existing data collected
# as a pickled object. Make sure we loop around to try to get
# more from another xattr key.
metadata = None
key += 1
def read_metadata(path_or_fd):
"""
Helper function to read the pickled metadata from a File/Directory.
:param path_or_fd: File/Directory path or fd from which to read metadata.
:returns: dictionary of metadata
"""
metadata = None
metadata_s = ''
key = 0
while metadata is None:
try:
metadata_s += do_getxattr(path_or_fd,
'%s%s' % (METADATA_KEY, (key or '')))
except IOError as err:
if err.errno == errno.ENODATA:
if key > 0:
# No errors reading the xattr keys, but since we have not
# been able to find enough chunks to get a successful
# unpickle operation, we consider the metadata lost, and
# drop the existing data so that the internal state can be
# recreated.
clean_metadata(path_or_fd)
# We either could not find any metadata key, or we could find
# some keys, but were not successful in performing the
# unpickling (missing keys perhaps)? Either way, just report
# to the caller we have no metadata.
metadata = {}
else:
# Note that we don't touch the keys on errors fetching the
# data since it could be a transient state.
raise GlusterFileSystemIOError(
err.errno, 'getxattr("%s", %s)' % (path_or_fd, key))
else:
try:
# If this key provides all or the remaining part of the pickle
# data, we don't need to keep searching for more keys. This
# means if we only need to store data in N xattr key/value
# pair, we only need to invoke xattr get N times. With large
# keys sizes we are shooting for N = 1.
metadata = pickle.loads(metadata_s)
assert isinstance(metadata, dict)
except EOFError, pickle.UnpicklingError:
# We still are not able recognize this existing data collected
# as a pickled object. Make sure we loop around to try to get
# more from another xattr key.
metadata = None
key += 1
