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lvutil: Remove SR lock during thin attach/detach #648

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lvutil: Remove SR lock during thin attach/detach #648

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18 changes: 0 additions & 18 deletions drivers/lvhdutil.py
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Original file line number Diff line number Diff line change
Expand Up @@ -213,25 +213,11 @@ def setSizeVirt(journaler, srUuid, vdiUuid, size, jFile):
vhdutil.setSizeVirt(path, size, jFile)


def _tryAcquire(lock):
"""We must give up if the SR is locked because it could be locked by the
coalesce thread trying to acquire the VDI lock we're holding, so as to
avoid deadlock"""
for i in range(LOCK_RETRY_ATTEMPTS):
gotLock = lock.acquireNoblock()
if gotLock:
return
time.sleep(1)
raise util.SRBusyException()


def attachThin(journaler, srUuid, vdiUuid):
"""Ensure that the VDI LV is expanded to the fully-allocated size"""
lvName = LV_PREFIX[vhdutil.VDI_TYPE_VHD] + vdiUuid
vgName = VG_PREFIX + srUuid
lock = Lock(vhdutil.LOCK_TYPE_SR, srUuid)
lvmCache = journaler.lvmCache
_tryAcquire(lock)
lvmCache.refresh()
vhdInfo = vhdutil.getVHDInfoLVM(lvName, extractUuid, vgName)
newSize = calcSizeVHDLV(vhdInfo.sizeVirt)
Expand All @@ -243,15 +229,12 @@ def attachThin(journaler, srUuid, vdiUuid):
inflate(journaler, srUuid, vdiUuid, newSize)
finally:
lvmCache.deactivate(NS_PREFIX_LVM + srUuid, vdiUuid, lvName, False)
lock.release()


def detachThin(session, lvmCache, srUuid, vdiUuid):
"""Shrink the VDI to the minimal size if no one is using it"""
lvName = LV_PREFIX[vhdutil.VDI_TYPE_VHD] + vdiUuid
path = os.path.join(VG_LOCATION, VG_PREFIX + srUuid, lvName)
lock = Lock(vhdutil.LOCK_TYPE_SR, srUuid)
_tryAcquire(lock)

vdiRef = session.xenapi.VDI.get_by_uuid(vdiUuid)
vbds = session.xenapi.VBD.get_all_records_where( \
Expand All @@ -270,7 +253,6 @@ def detachThin(session, lvmCache, srUuid, vdiUuid):
deflate(lvmCache, lvName, newSize)
finally:
lvmCache.deactivate(NS_PREFIX_LVM + srUuid, vdiUuid, lvName, False)
lock.release()


def createVHDJournalLV(lvmCache, jName, size):
Expand Down