def remove(self, lease_id):
"""
Remove lease from index
Raises:
- NoSuchLease if lease was not found
- OSError if I/O operation failed
- sanlock.SanlockException if sanlock operation failed.
"""
log.info("Removing lease %r in lockspace %r",
lease_id, self.lockspace)
recnum = self._index.find_record(lease_id)
if recnum == -1:
raise se.NoSuchLease(lease_id)
offset = lease_offset(recnum)
record = Record(lease_id, offset, updating=True)
self._write_record(recnum, record)
# There is no way to remove a resource, so we write an invalid resource
# with empty resource and lockspace values.
# TODO: Use SANLK_WRITE_CLEAR, expected in rhel 7.4.
sanlock.write_resource(
"",
"",
[(self._file.name, offset)],
align=self._alignment,
sector=self._block_size)
self._write_record(recnum, EMPTY_RECORD)
def lookup(self, lease_id):
"""
Lookup lease by lease_id and return LeaseInfo if found.
Raises:
- NoSuchLease if lease is not found or updating flag is set (legacy)
- InvalidRecord if corrupted lease record is found
- OSError if io operation failed
"""
log.debug("Looking up lease %r in lockspace %r", lease_id,
self.lockspace)
recnum = self._index.find_record(lease_id)
if recnum == -1:
raise se.NoSuchLease(lease_id)
record = self._index.read_record(recnum)
if record.updating:
# Record can have updating flag due to partial creation caused
# by older vdsm versions.
raise se.NoSuchLease(lease_id)
offset = lease_offset(recnum, self._alignment)
return LeaseInfo(self.lockspace, lease_id, self._file.name, offset)
def lookup(self, lease_id):
"""
Lookup lease by lease_id and return LeaseInfo if found.
Raises:
- NoSuchLease if lease is not found.
- InvalidRecord if corrupted lease record is found
- OSError if io operation failed
"""
log.debug("Looking up lease %r in lockspace %r",
lease_id, self.lockspace)
recnum = self._index.find_record(lease_id)
if recnum == -1:
raise se.NoSuchLease(lease_id)
record = self._index.read_record(recnum)
if record.updating:
raise LeaseUpdating(lease_id)
offset = lease_offset(recnum)
return LeaseInfo(self.lockspace, lease_id, self._file.name, offset)
def remove(self, lease_id):
"""
Remove lease from index
Raises:
- NoSuchLease if lease was not found
- OSError if I/O operation failed
- sanlock.SanlockException if sanlock operation failed.
"""
log.info("Removing lease %r in lockspace %r", lease_id, self.lockspace)
recnum = self._index.find_record(lease_id)
if recnum == -1:
raise se.NoSuchLease(lease_id)
offset = lease_offset(recnum, self._alignment)
# We remove a lease in 2 steps:
# 1. write an empty record, making the resource unavailable. If writing
# a record fails, the index does not change and the new resource
# remains available
# 2. write an empty sanlock resource in the slot associated with this
# record. If this fails we log an error and don't fail the removal
# as index is already updated and resource will not be available.
self._write_record(recnum, EMPTY_RECORD)
# There is no way to remove a resource, so we write an invalid resource
# with empty resource and lockspace values.
# TODO: Use SANLK_WRITE_CLEAR, expected in rhel 7.4.
try:
sanlock.write_resource(b"",
b"", [(self._file.name, offset)],
align=self._alignment,
sector=self._block_size)
except sanlock.SanlockException:
log.warning(
"Ignoring failure to clear sanlock resource file=%s "
"offset=%s", self._file.name, offset)