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dom0/qvm-block: use xenstore transactions (#507)

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This commit is contained in:
Marek Marczykowski 2012-04-02 09:52:29 +02:00
parent d8b979d844
commit ff52cbe378
1 changed files with 15 additions and 9 deletions
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24
dom0/qvm-core/qubesutils.py
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@ -203,10 +203,11 @@ def block_list(vm = None, system_disks = False):
else: else:
vm_list = xs.ls('', '/local/domain') vm_list = xs.ls('', '/local/domain')
xs_trans = xs.transaction_start()
devices_list = {} devices_list = {}
for xid in vm_list: for xid in vm_list:
vm_name = xs.read('', '/local/domain/%s/name' % xid) vm_name = xs.read(xs_trans, '/local/domain/%s/name' % xid)
vm_devices = xs.ls('', '/local/domain/%s/qubes-block-devices' % xid) vm_devices = xs.ls(xs_trans, '/local/domain/%s/qubes-block-devices' % xid)
if vm_devices is None: if vm_devices is None:
continue continue
for device in vm_devices: for device in vm_devices:
@ -215,9 +216,9 @@ def block_list(vm = None, system_disks = False):
print >> sys.stderr, "Invalid device name in VM '%s'" % vm_name print >> sys.stderr, "Invalid device name in VM '%s'" % vm_name
continue continue
device_size = xs.read('', '/local/domain/%s/qubes-block-devices/%s/size' % (xid, device)) device_size = xs.read(xs_trans, '/local/domain/%s/qubes-block-devices/%s/size' % (xid, device))
device_desc = xs.read('', '/local/domain/%s/qubes-block-devices/%s/desc' % (xid, device)) device_desc = xs.read(xs_trans, '/local/domain/%s/qubes-block-devices/%s/desc' % (xid, device))
device_mode = xs.read('', '/local/domain/%s/qubes-block-devices/%s/mode' % (xid, device)) device_mode = xs.read(xs_trans, '/local/domain/%s/qubes-block-devices/%s/mode' % (xid, device))
if device_size is None or device_desc is None or device_mode is None: if device_size is None or device_desc is None or device_mode is None:
print >> sys.stderr, "Missing field in %s device parameters" % device print >> sys.stderr, "Missing field in %s device parameters" % device
@ -245,13 +246,16 @@ def block_list(vm = None, system_disks = False):
"vm": vm_name, "device":device, "size":int(device_size), "vm": vm_name, "device":device, "size":int(device_size),
"desc":device_desc, "mode":device_mode} "desc":device_desc, "mode":device_mode}
xs.transaction_end(xs_trans)
return devices_list return devices_list
def block_check_attached(backend_vm, device, backend_xid = None): def block_check_attached(backend_vm, device, backend_xid = None):
if backend_xid is None: if backend_xid is None:
backend_xid = backend_vm.xid backend_xid = backend_vm.xid
vm_list = xs.ls('', '/local/domain/%d/backend/vbd' % backend_xid) xs_trans = xs.transaction_start()
vm_list = xs.ls(xs_trans, '/local/domain/%d/backend/vbd' % backend_xid)
if vm_list is None: if vm_list is None:
xs.transaction_end(xs_trans)
return None return None
device_majorminor = None device_majorminor = None
try: try:
@ -260,10 +264,10 @@ def block_check_attached(backend_vm, device, backend_xid = None):
# Unknown devices will be compared directly - perhaps it is a filename? # Unknown devices will be compared directly - perhaps it is a filename?
pass pass
for vm_xid in vm_list: for vm_xid in vm_list:
for devid in xs.ls('', '/local/domain/%d/backend/vbd/%s' % (backend_xid, vm_xid)): for devid in xs.ls(xs_trans, '/local/domain/%d/backend/vbd/%s' % (backend_xid, vm_xid)):
(tmp_major, tmp_minor) = (0, 0) (tmp_major, tmp_minor) = (0, 0)
phys_device = xs.read('', '/local/domain/%d/backend/vbd/%s/%s/physical-device' % (backend_xid, vm_xid, devid)) phys_device = xs.read(xs_trans, '/local/domain/%d/backend/vbd/%s/%s/physical-device' % (backend_xid, vm_xid, devid))
dev_params = xs.read('', '/local/domain/%d/backend/vbd/%s/%s/params' % (backend_xid, vm_xid, devid)) dev_params = xs.read(xs_trans, '/local/domain/%d/backend/vbd/%s/%s/params' % (backend_xid, vm_xid, devid))
if phys_device and phys_device.find(':'): if phys_device and phys_device.find(':'):
(tmp_major, tmp_minor) = phys_device.split(":") (tmp_major, tmp_minor) = phys_device.split(":")
tmp_major = int(tmp_major, 16) tmp_major = int(tmp_major, 16)
@ -283,7 +287,9 @@ def block_check_attached(backend_vm, device, backend_xid = None):
(device_majorminor is None and dev_params == device): (device_majorminor is None and dev_params == device):
vm_name = xl_ctx.domid_to_name(int(vm_xid)) vm_name = xl_ctx.domid_to_name(int(vm_xid))
frontend = block_devid_to_name(int(devid)) frontend = block_devid_to_name(int(devid))
xs.transaction_end(xs_trans)
return {"xid":int(vm_xid), "frontend": frontend, "devid": int(devid), "vm": vm_name} return {"xid":int(vm_xid), "frontend": frontend, "devid": int(devid), "vm": vm_name}
xs.transaction_end(xs_trans)
return None return None
def block_attach(vm, backend_vm, device, frontend=None, mode="w", auto_detach=False): def block_attach(vm, backend_vm, device, frontend=None, mode="w", auto_detach=False):