def mount_and_select_hosting_volume(pv_hosting_volumes, required_size):
"""Mount each hosting volume to find available space"""
for volume in pv_hosting_volumes:
hvol = volume['name']
mntdir = os.path.join(HOSTVOL_MOUNTDIR, hvol)
mount_glusterfs(volume, mntdir)
with statfile_lock:
# Stat done before `os.path.exists` to prevent ignoring
# file not exists even in case of ENOTCONN
mntdir_stat = retry_errors(os.statvfs, [mntdir], [ENOTCONN])
with SizeAccounting(hvol, mntdir) as acc:
acc.update_summary(mntdir_stat.f_bavail * mntdir_stat.f_bsize)
pv_stats = acc.get_stats()
reserved_size = pv_stats[
"free_size_bytes"] * RESERVED_SIZE_PERCENTAGE / 100
logging.debug(
logf("pv stats",
hostvol=hvol,
total_size_bytes=pv_stats["total_size_bytes"],
used_size_bytes=pv_stats["used_size_bytes"],
free_size_bytes=pv_stats["free_size_bytes"],
number_of_pvs=pv_stats["number_of_pvs"],
required_size=required_size,
reserved_size=reserved_size))
if required_size < (pv_stats["free_size_bytes"] - reserved_size):
return hvol
return None
def is_hosting_volume_free(hostvol, requested_pvsize):
"""Check if host volume is free to expand or create (external)volume"""
mntdir = os.path.join(HOSTVOL_MOUNTDIR, hostvol)
with statfile_lock:
# Stat done before `os.path.exists` to prevent ignoring
# file not exists even in case of ENOTCONN
mntdir_stat = retry_errors(os.statvfs, [mntdir], [ENOTCONN])
with SizeAccounting(hostvol, mntdir) as acc:
acc.update_summary(mntdir_stat.f_bavail * mntdir_stat.f_bsize)
pv_stats = acc.get_stats()
reserved_size = pv_stats[
"free_size_bytes"] * RESERVED_SIZE_PERCENTAGE / 100
logging.debug(
logf("pv stats",
hostvol=hostvol,
total_size_bytes=pv_stats["total_size_bytes"],
used_size_bytes=pv_stats["used_size_bytes"],
free_size_bytes=pv_stats["free_size_bytes"],
number_of_pvs=pv_stats["number_of_pvs"],
required_size=requested_pvsize,
reserved_size=reserved_size))
if requested_pvsize < (pv_stats["free_size_bytes"] - reserved_size):
return True
return False
def update_free_size(hostvol, pvname, sizechange):
"""Update the free size in respective host volume's stats.db file"""
mntdir = os.path.join(HOSTVOL_MOUNTDIR, hostvol)
# Check for mount availability before updating the free size
retry_errors(os.statvfs, [mntdir], [ENOTCONN])
with statfile_lock:
with SizeAccounting(hostvol, mntdir) as acc:
# Reclaim space
if sizechange > 0:
acc.remove_pv_record(pvname)
else:
acc.update_pv_record(pvname, -sizechange)