Commit 5282084b authored by Iustin Pop's avatar Iustin Pop
Browse files

backend: Remove symlinks by disk name

This is a modified forward-port of commit 1184 on the 1.2 branch:

  backend: Remove symlinks by disk name, not using a wildcard

  Reviewed-by: ultrotter

The changes to the original patch are related to the docstring style and
iv_name to index switch.

Original-Author: imsnah
parent b2e7666a
......@@ -733,27 +733,29 @@ def _GetVGInfo(vg_name):
return retdic
def _SymlinkBlockDev(instance_name, device_path, device_name):
def _GetBlockDevSymlinkPath(instance_name, idx):
return os.path.join(constants.DISK_LINKS_DIR,
"%s:%d" % (instance_name, idx))
def _SymlinkBlockDev(instance_name, device_path, idx):
"""Set up symlinks to a instance's block device.
This is an auxiliary function run when an instance is start (on the primary
node) or when an instance is migrated (on the target node).
instance_name: the name of the target instance
device_path: path of the physical block device, on the node
device_name: 'virtual' name of the device
absolute path to the disk's symlink
@param instance_name: the name of the target instance
@param device_path: path of the physical block device, on the node
@param idx: the disk index
@return: absolute path to the disk's symlink
link_basename = "%s-%s" % (instance_name, device_name)
link_name = os.path.join(constants.DISK_LINKS_DIR, link_basename)
link_name = _GetBlockDevSymlinkPath(instance_name, idx)
os.symlink(device_path, link_name)
except OSError, e:
if e.errno == errno.EEXIST:
except OSError, err:
if err.errno == errno.EEXIST:
if (not os.path.islink(link_name) or
os.readlink(link_name) != device_path):
......@@ -764,14 +766,13 @@ def _SymlinkBlockDev(instance_name, device_path, device_name):
return link_name
def _RemoveBlockDevLinks(instance_name):
def _RemoveBlockDevLinks(instance_name, disks):
"""Remove the block device symlinks belonging to the given instance.
for short_name in os.listdir(constants.DISK_LINKS_DIR):
link_name = os.path.join(constants.DISK_LINKS_DIR, short_name)
if (os.path.islink(link_name) and
short_name.startswith('%s-' % instance_name)):
for idx, disk in enumerate(disks):
link_name = _GetBlockDevSymlinkPath(instance_name, idx)
if os.path.islink(link_name):
except OSError:
......@@ -798,8 +799,7 @@ def _GatherAndLinkBlockDevs(instance):
link_name = _SymlinkBlockDev(, device.dev_path,
"disk%d" % idx)
link_name = _SymlinkBlockDev(, device.dev_path, idx)
except OSError, e:
raise errors.BlockDeviceError("Cannot create block device symlink: %s" %
......@@ -832,7 +832,7 @@ def StartInstance(instance, extra_args):
return False
except errors.HypervisorError, err:
logging.exception("Failed to start instance")
_RemoveBlockDevLinks(, instance.disks)
return False
return True
......@@ -885,7 +885,7 @@ def ShutdownInstance(instance):
return False
_RemoveBlockDevLinks(, instance.disks)
return True
......@@ -2107,7 +2107,7 @@ def CloseBlockDevices(instance_name, disks):
return (False, "Can't make devices secondary: %s" % ",".join(msg))
if instance_name:
_RemoveBlockDevLinks(instance_name, disks)
return (True, "All devices secondary")
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