Commit b496abdb authored by Bernardo Dal Seno's avatar Bernardo Dal Seno
Browse files

bdev.GetPVInfo() returns list of LVs



This will be used for checks related to exclusive storage.
Signed-off-by: default avatarBernardo Dal Seno <bdalseno@google.com>
Reviewed-by: default avatarMichael Hanselmann <hansmi@google.com>
parent 39eb39dc
......@@ -666,35 +666,59 @@ class LogicalVolume(BlockDev):
return data
@classmethod
def GetPVInfo(cls, vg_names, filter_allocatable=True):
def GetPVInfo(cls, vg_names, filter_allocatable=True, include_lvs=False):
"""Get the free space info for PVs in a volume group.
@param vg_names: list of volume group names, if empty all will be returned
@param filter_allocatable: whether to skip over unallocatable PVs
@param include_lvs: whether to include a list of LVs hosted on each PV
@rtype: list
@return: list of objects.LvmPvInfo objects
"""
# We request "lv_name" field only if we care about LVs, so we don't get
# a long list of entries with many duplicates unless we really have to.
# The duplicate "pv_name" field will be ignored.
if include_lvs:
lvfield = "lv_name"
else:
lvfield = "pv_name"
try:
info = cls._GetVolumeInfo("pvs", ["pv_name", "vg_name", "pv_free",
"pv_attr", "pv_size"])
"pv_attr", "pv_size", lvfield])
except errors.GenericError, err:
logging.error("Can't get PV information: %s", err)
return None
# When asked for LVs, "pvs" may return multiple entries for the same PV-LV
# pair. We sort entries by PV name and then LV name, so it's easy to weed
# out duplicates.
if include_lvs:
info.sort(key=(lambda i: (i[0], i[5])))
data = []
for (pv_name, vg_name, pv_free, pv_attr, pv_size) in info:
lastpvi = None
for (pv_name, vg_name, pv_free, pv_attr, pv_size, lv_name) in info:
# (possibly) skip over pvs which are not allocatable
if filter_allocatable and pv_attr[0] != "a":
continue
# (possibly) skip over pvs which are not in the right volume group(s)
if vg_names and vg_name not in vg_names:
continue
pvi = objects.LvmPvInfo(name=pv_name, vg_name=vg_name,
size=float(pv_size), free=float(pv_free),
attributes=pv_attr)
data.append(pvi)
# Beware of duplicates (check before inserting)
if lastpvi and lastpvi.name == pv_name:
if include_lvs and lv_name:
if not lastpvi.lv_list or lastpvi.lv_list[-1] != lv_name:
lastpvi.lv_list.append(lv_name)
else:
if include_lvs and lv_name:
lvl = [lv_name]
else:
lvl = []
lastpvi = objects.LvmPvInfo(name=pv_name, vg_name=vg_name,
size=float(pv_size), free=float(pv_free),
attributes=pv_attr, lv_list=lvl)
data.append(lastpvi)
return data
......
......@@ -2074,6 +2074,8 @@ class LvmPvInfo(ConfigObject):
@ivar free: free space in the PV, in MiB
@type attributes: string
@ivar attributes: PV attributes
@type lv_list: list of strings
@ivar lv_list: names of the LVs hosted on the PV
"""
__slots__ = [
"name",
......@@ -2081,6 +2083,7 @@ class LvmPvInfo(ConfigObject):
"size",
"free",
"attributes",
"lv_list"
]
def IsEmpty(self):
......
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