def reduceLV(vgName, lvName, size_mb, force=False):
log.info("Reducing LV %s/%s to %s megabytes (force=%s)", vgName, lvName,
size_mb, force)
cmd = ("lvreduce", ) + LVM_NOBACKUP
if force:
cmd += ("--force", )
cmd += ("--size", "%sm" % (size_mb, ), "%s/%s" % (vgName, lvName))
rc, out, err = _lvminfo.cmd(cmd, _lvminfo._getVGDevs((vgName, )))
if rc != 0:
# Since this runs only on the SPM, assume that cached vg and lv
# metadata is correct.
vg = getVG(vgName)
lv = getLV(vgName, lvName)
# Convert sizes to extents
extent_size = int(vg.extent_size)
lv_extents = int(lv.size) // extent_size
requested_size = size_mb * constants.MEGAB
requested_extents = (requested_size + extent_size - 1) // extent_size
if lv_extents <= requested_extents:
log.debug("LV %s/%s already reduced (extents=%d, requested=%d)",
vgName, lvName, lv_extents, requested_extents)
return
# TODO: add and raise LogicalVolumeReduceError
raise se.LogicalVolumeExtendError(vgName, lvName, "%sm" % (size_mb, ))
_lvminfo._invalidatevgs(vgName)
_lvminfo._invalidatelvs(vgName, lvName)
def extendLV(vgName, lvName, size_mb):
log.info("Extending LV %s/%s to %s megabytes", vgName, lvName, size_mb)
cmd = ("lvextend", ) + LVM_NOBACKUP
cmd += ("--size", "%sm" % (size_mb, ), "%s/%s" % (vgName, lvName))
rc, out, err = _lvminfo.cmd(cmd, _lvminfo._getVGDevs((vgName, )))
if rc != 0:
# Since this runs only on the SPM, assume that cached vg and lv
# metadata is correct.
vg = getVG(vgName)
lv = getLV(vgName, lvName)
# Convert sizes to extents to match lvm behavior.
extent_size = int(vg.extent_size)
lv_extents = int(lv.size) // extent_size
requested_size = size_mb * constants.MEGAB
requested_extents = (requested_size + extent_size - 1) // extent_size
if lv_extents >= requested_extents:
log.debug("LV %s/%s already extended (extents=%d, requested=%d)",
vgName, lvName, lv_extents, requested_extents)
return
needed_extents = requested_extents - lv_extents
free_extents = int(vg.free_count)
if free_extents < needed_extents:
raise se.VolumeGroupSizeError(
"Not enough free extents for extending LV %s/%s (free=%d, "
"needed=%d)" % (vgName, lvName, free_extents, needed_extents))
raise se.LogicalVolumeExtendError(vgName, lvName, "%sm" % (size_mb, ))
_lvminfo._invalidatevgs(vgName)
_lvminfo._invalidatelvs(vgName, lvName)
def _resizeLV(op, vgName, lvName, size):
"""
Size units: MB (1024 ** 2 = 2 ** 20)B.
"""
# WARNING! From man vgs:
# All sizes are output in these units: (h)uman-readable, (b)ytes,
# (s)ectors,(k)ilobytes, (m)egabytes, (g)igabytes, (t)erabytes,
# (p)etabytes, (e)xabytes.
# Capitalise to use multiples of 1000 (S.I.) instead of 1024.
cmd = (op, ) + LVM_NOBACKUP
cmd += ("--size", "%sm" % (size, ), "%s/%s" % (vgName, lvName))
rc, out, err = _lvminfo.cmd(cmd, _lvminfo._getVGDevs((vgName, )))
if rc == 0:
_lvminfo._invalidatevgs(vgName)
_lvminfo._invalidatelvs(vgName, lvName)
elif rc == 3:
# In LVM we trust. Hope that 3 is only for this.
log.debug("New size (in extents) matches existing size (in extents).")
elif rc != 0:
# get the free extents size
# YaRC
vg = getVG(vgName)
free_size = int(vg.extent_size) * int(vg.free_count) # in B
if free_size < int(size) * constants.MEGAB:
raise se.VolumeGroupSizeError(
"%s/%s %d > %d (MiB)" %
(vgName, lvName, int(size), free_size / constants.MEGAB))
raise se.LogicalVolumeExtendError(vgName, lvName, "%sM" % (size, ))
def extendLV(self, vgName, lvName, size_mb, refresh=True):
try:
lv = self.lvmd[(vgName, lvName)]
except KeyError:
raise se.LogicalVolumeExtendError("cmd", 5, ["out"], ["err"])
size = self._size_param_to_bytes(size_mb)
current_size = int(lv["size"])
if current_size >= size:
# In real lvm code we call call lvm and check after the call if the
# lvm is already in the corect size.
return
lv['size'] = str(size)
self._extend_lv_file(vgName, lvName, lv['active'], size)
def test_reduce_failure(self):
with self.make_env(sd_type='block', format='cow', chain_len=4) as env:
base_vol = env.chain[0]
top_vol = env.chain[1]
subchain_info = dict(sd_id=base_vol.sdUUID,
img_id=base_vol.imgUUID,
base_id=base_vol.volUUID,
top_id=top_vol.volUUID,
base_generation=0)
subchain = merge.SubchainInfo(subchain_info, 0)
fake_sd = env.sdcache.domains[env.sd_manifest.sdUUID]
fake_base_vol = fake_sd.produceVolume(subchain.img_id,
subchain.base_id)
fake_base_vol.errors["reduce"] = se.LogicalVolumeExtendError(
"vgname", "lvname", base_vol.optimal_size())
with pytest.raises(se.LogicalVolumeExtendError):
merge.finalize(subchain)
# verify syncVolumeChain arguments
self.check_sync_volume_chain(subchain, env.chain[-1].volUUID)
