mirror of
https://github.com/virt-manager/virt-manager.git
synced 2024-12-23 17:34:21 +03:00
7c10d8a27f
Following some discussion here: https://bugzilla.redhat.com/show_bug.cgi?id=1171550 jfehlig suggested better defaults for modern xen. End result is: - Drop the blktap check, since it's deprecated (yaay) - If xen + block device, use driver_name=phy - Otherwise if on modern enough libvirt + libxl, do the same thing we do for qemu.
1016 lines
33 KiB
Python
1016 lines
33 KiB
Python
#
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# Classes for building disk device xml
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#
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# Copyright 2006-2008, 2012-2014 Red Hat, Inc.
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# Jeremy Katz <katzj@redhat.com>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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# MA 02110-1301 USA.
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import os
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import stat
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import pwd
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import subprocess
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import logging
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import re
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from . import diskbackend
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from . import util
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from .device import VirtualDevice
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from .seclabel import Seclabel
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from .xmlbuilder import XMLChildProperty, XMLProperty
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def _qemu_sanitize_drvtype(phystype, fmt, manual_format=False):
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"""
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Sanitize libvirt storage volume format to a valid qemu driver type
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"""
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raw_list = ["iso"]
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if phystype == VirtualDisk.TYPE_BLOCK:
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if not fmt:
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return VirtualDisk.DRIVER_TYPE_RAW
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if fmt and not manual_format:
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return VirtualDisk.DRIVER_TYPE_RAW
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if fmt in raw_list:
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return VirtualDisk.DRIVER_TYPE_RAW
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return fmt
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def _is_dir_searchable(uid, username, path):
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"""
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Check if passed directory is searchable by uid
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"""
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if "VIRTINST_TEST_SUITE" in os.environ:
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return True
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try:
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statinfo = os.stat(path)
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except OSError:
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return False
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if uid == statinfo.st_uid:
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flag = stat.S_IXUSR
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elif uid == statinfo.st_gid:
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flag = stat.S_IXGRP
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else:
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flag = stat.S_IXOTH
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if bool(statinfo.st_mode & flag):
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return True
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# Check POSIX ACL (since that is what we use to 'fix' access)
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cmd = ["getfacl", path]
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try:
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proc = subprocess.Popen(cmd,
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE)
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out, err = proc.communicate()
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except OSError:
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logging.debug("Didn't find the getfacl command.")
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return False
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if proc.returncode != 0:
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logging.debug("Cmd '%s' failed: %s", cmd, err)
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return False
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return bool(re.search("user:%s:..x" % username, out))
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class VirtualDisk(VirtualDevice):
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virtual_device_type = VirtualDevice.VIRTUAL_DEV_DISK
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DRIVER_NAME_PHY = "phy"
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DRIVER_NAME_QEMU = "qemu"
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DRIVER_TYPE_RAW = "raw"
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CACHE_MODE_NONE = "none"
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CACHE_MODE_WRITETHROUGH = "writethrough"
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CACHE_MODE_WRITEBACK = "writeback"
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CACHE_MODE_DIRECTSYNC = "directsync"
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CACHE_MODE_UNSAFE = "unsafe"
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cache_types = [CACHE_MODE_NONE, CACHE_MODE_WRITETHROUGH,
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CACHE_MODE_WRITEBACK, CACHE_MODE_DIRECTSYNC, CACHE_MODE_UNSAFE]
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DISCARD_MODE_IGNORE = "ignore"
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DISCARD_MODE_UNMAP = "unmap"
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discard_types = [DISCARD_MODE_IGNORE, DISCARD_MODE_UNMAP]
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DEVICE_DISK = "disk"
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DEVICE_LUN = "lun"
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DEVICE_CDROM = "cdrom"
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DEVICE_FLOPPY = "floppy"
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devices = [DEVICE_DISK, DEVICE_LUN, DEVICE_CDROM, DEVICE_FLOPPY]
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TYPE_FILE = "file"
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TYPE_BLOCK = "block"
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TYPE_DIR = "dir"
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TYPE_VOLUME = "volume"
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TYPE_NETWORK = "network"
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types = [TYPE_FILE, TYPE_BLOCK, TYPE_DIR, TYPE_NETWORK]
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IO_MODE_NATIVE = "native"
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IO_MODE_THREADS = "threads"
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io_modes = [IO_MODE_NATIVE, IO_MODE_THREADS]
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error_policies = ["ignore", "stop", "enospace", "report"]
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@staticmethod
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def disk_type_to_xen_driver_name(disk_type):
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"""
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Convert a value of VirtualDisk.type to it's associated Xen
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<driver name=/> property
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"""
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if disk_type == VirtualDisk.TYPE_BLOCK:
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return "phy"
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elif disk_type == VirtualDisk.TYPE_FILE:
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return "file"
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return "file"
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@staticmethod
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def pretty_disk_bus(bus):
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if bus in ["ide", "sata", "scsi", "usb", "sd"]:
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return bus.upper()
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if bus in ["xen"]:
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return bus.capitalize()
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if bus == "virtio":
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return "VirtIO"
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return bus
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@staticmethod
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def path_definitely_exists(conn, path):
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"""
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Check if path exists.
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return True if we are certain, False otherwise. Path may in fact
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exist if we return False, but we can't exhaustively know in all
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cases.
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(In fact if cached storage volume data is out of date, the volume
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may have disappeared behind out back, but that shouldn't have bad
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effects in practice.)
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"""
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if path is None:
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return False
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try:
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(vol, pool) = diskbackend.check_if_path_managed(conn, path)
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ignore = pool
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if vol:
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return True
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if not conn.is_remote():
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return os.path.exists(path)
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except:
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pass
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return False
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@staticmethod
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def check_path_search_for_user(conn, path, username):
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"""
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Check if the passed user has search permissions for all the
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directories in the disk path.
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@return: List of the directories the user cannot search, or empty list
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@rtype : C{list}
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"""
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if path is None:
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return []
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if conn.is_remote():
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return []
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if username == "root":
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return []
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if diskbackend.path_is_url(path):
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return []
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try:
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# Get UID for string name
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uid = pwd.getpwnam(username)[2]
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except Exception, e:
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logging.debug("Error looking up username: %s", str(e))
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return []
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fixlist = []
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if os.path.isdir(path):
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dirname = path
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base = "-"
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else:
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dirname, base = os.path.split(path)
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while base:
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if not _is_dir_searchable(uid, username, dirname):
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fixlist.append(dirname)
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dirname, base = os.path.split(dirname)
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return fixlist
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@staticmethod
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def check_path_search(conn, path):
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# Only works for qemu and DAC
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if conn.is_remote() or not conn.is_qemu_system():
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return None, []
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from virtcli import CLIConfig
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user = CLIConfig.default_qemu_user
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try:
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for secmodel in conn.caps.host.secmodels:
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if secmodel.model != "dac":
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continue
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label = None
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for baselabel in secmodel.baselabels:
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if baselabel.type in ["qemu", "kvm"]:
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label = baselabel.content
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break
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if not label:
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continue
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pwuid = pwd.getpwuid(
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int(label.split(":")[0].replace("+", "")))
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if pwuid:
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user = pwuid[0]
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except:
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logging.debug("Exception grabbing qemu DAC user", exc_info=True)
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return None, []
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return user, VirtualDisk.check_path_search_for_user(conn, path, user)
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@staticmethod
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def fix_path_search_for_user(conn, path, username):
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"""
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Try to fix any permission problems found by check_path_search_for_user
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@return: Return a dictionary of entries {broken path : error msg}
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@rtype : C{dict}
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"""
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def fix_perms(dirname, useacl=True):
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if useacl:
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cmd = ["setfacl", "--modify", "user:%s:x" % username, dirname]
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proc = subprocess.Popen(cmd,
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE)
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out, err = proc.communicate()
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logging.debug("Ran command '%s'", cmd)
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if out or err:
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logging.debug("out=%s\nerr=%s", out, err)
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if proc.returncode != 0:
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raise ValueError(err)
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else:
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logging.debug("Setting +x on %s", dirname)
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mode = os.stat(dirname).st_mode
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newmode = mode | stat.S_IXOTH
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os.chmod(dirname, newmode)
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if os.stat(dirname).st_mode != newmode:
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# Trying to change perms on vfat at least doesn't work
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# but also doesn't seem to error. Try and detect that
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raise ValueError(_("Permissions on '%s' did not stick") %
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dirname)
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fixlist = VirtualDisk.check_path_search_for_user(conn, path, username)
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if not fixlist:
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return []
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fixlist.reverse()
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errdict = {}
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useacl = True
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for dirname in fixlist:
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try:
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try:
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fix_perms(dirname, useacl)
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except:
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# If acl fails, fall back to chmod and retry
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if not useacl:
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raise
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useacl = False
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logging.debug("setfacl failed, trying old fashioned way")
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fix_perms(dirname, useacl)
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except Exception, e:
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errdict[dirname] = str(e)
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return errdict
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@staticmethod
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def path_in_use_by(conn, path, shareable=False, read_only=False):
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"""
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Return a list of VM names that are using the passed path.
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@param conn: virConnect to check VMs
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@param path: Path to check for
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@param shareable: Path we are checking is marked shareable, so
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don't warn if it conflicts with another shareable source.
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@param read_only: Path we are checking is marked read_only, so
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don't warn if it conflicts with another read_only source.
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"""
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if not path:
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return []
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# Find all volumes that have 'path' somewhere in their backing chain
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vols = []
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volmap = dict((vol.backing_store, vol)
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for vol in conn.fetch_all_vols() if vol.backing_store)
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backpath = path
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while backpath in volmap:
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vol = volmap[backpath]
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if vol in vols:
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break
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backpath = vol.target_path
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vols.append(backpath)
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ret = []
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vms = conn.fetch_all_guests()
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for vm in vms:
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if not read_only:
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if path in [vm.os.kernel, vm.os.initrd, vm.os.dtb]:
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ret.append(vm.name)
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continue
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for disk in vm.get_devices("disk"):
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if disk.path in vols and vm.name not in ret:
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# VM uses the path indirectly via backing store
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ret.append(vm.name)
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break
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if disk.path != path:
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continue
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if shareable and disk.shareable:
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continue
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if read_only and disk.read_only:
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continue
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ret.append(vm.name)
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break
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return ret
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@staticmethod
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def build_vol_install(conn, volname, poolobj, size, sparse,
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fmt=None, backing_store=None):
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"""
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Helper for building a StorageVolume instance to pass to VirtualDisk
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for eventual storage creation.
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:param volname: name of the volume to be created
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:param size: size in bytes
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"""
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from .storage import StorageVolume
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if size is None:
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raise ValueError(_("Size must be specified for non "
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"existent volume '%s'" % volname))
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# This catches --disk /dev/idontexist,size=1 if /dev is unmanaged
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if not poolobj:
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raise RuntimeError(_("Don't know how to create storage for "
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"path '%s'. Use libvirt APIs to manage the parent directory "
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"as a pool first.") % volname)
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logging.debug("Creating volume '%s' on pool '%s'",
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volname, poolobj.name())
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cap = (size * 1024 * 1024 * 1024)
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if sparse:
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alloc = 0
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else:
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alloc = cap
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volinst = StorageVolume(conn)
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volinst.pool = poolobj
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volinst.name = volname
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volinst.capacity = cap
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volinst.allocation = alloc
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volinst.backing_store = backing_store
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if fmt:
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if not volinst.supports_property("format"):
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raise ValueError(_("Format attribute not supported for this "
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"volume type"))
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volinst.format = fmt
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return volinst
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@staticmethod
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def num_to_target(num):
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"""
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Convert an index in range (1, 1024) to a disk /dev number
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(like hda, hdb, hdaa, etc.)
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"""
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digits = []
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for factor in range(0, 3):
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amt = (num % (26 ** (factor + 1))) / (26 ** factor)
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if amt == 0 and num >= (26 ** (factor + 1)):
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amt = 26
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num -= amt
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digits.insert(0, amt)
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seen_valid = False
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gen_t = ""
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for digit in digits:
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if digit == 0:
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if not seen_valid:
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continue
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digit = 1
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seen_valid = True
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gen_t += "%c" % (ord('a') + digit - 1)
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return gen_t
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@staticmethod
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def target_to_num(tgt):
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"""
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Convert disk /dev number (like hda, hdb, hdaa, etc.) to an index
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"""
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num = 0
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k = 0
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if tgt[0] == 'x':
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# This case is here for 'xvda'
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tgt = tgt[1:]
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for i, c in enumerate(reversed(tgt[2:])):
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if i != 0:
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k = 1
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num += (ord(c) - ord('a') + k) * (26 ** i)
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return num
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_XML_PROP_ORDER = [
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"type", "device",
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"driver_name", "driver_type",
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"driver_cache", "driver_discard", "driver_io", "error_policy",
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"_source_file", "_source_dev", "_source_dir",
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"source_volume", "source_pool", "source_protocol", "source_name",
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"source_host_name", "source_host_port",
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"source_host_transport", "source_host_socket",
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"target", "bus",
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]
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def __init__(self, *args, **kwargs):
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VirtualDevice.__init__(self, *args, **kwargs)
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self._storage_backend = None
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self.storage_was_created = False
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#############################
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# Public property-esque API #
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#############################
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def _get_path(self):
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if not self._storage_backend:
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xmlpath = self._get_xmlpath()
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if xmlpath:
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return xmlpath
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self._set_default_storage_backend()
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return self._storage_backend.get_path()
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def _set_path(self, newpath):
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if (self._storage_backend and
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self._storage_backend.will_create_storage()):
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raise ValueError("Can't change disk path if storage creation info "
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"has been set.")
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# User explicitly changed 'path', so try to lookup its storage
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# object since we may need it
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(vol_object, parent_pool) = diskbackend.manage_path(self.conn, newpath)
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self._change_backend(newpath, vol_object, parent_pool)
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self._set_xmlpath(self.path)
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path = property(_get_path, _set_path)
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def set_vol_object(self, vol_object, parent_pool):
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logging.debug("disk.set_vol_object: volxml=\n%s",
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vol_object.XMLDesc(0))
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logging.debug("disk.set_vol_object: poolxml=\n%s",
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parent_pool.XMLDesc(0))
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self._change_backend(None, vol_object, parent_pool)
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self._set_xmlpath(self.path)
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def set_vol_install(self, vol_install):
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logging.debug("disk.set_vol_install: name=%s poolxml=\n%s",
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vol_install.name, vol_install.pool.XMLDesc(0))
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self._storage_backend = diskbackend.ManagedStorageCreator(
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self.conn, vol_install)
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self._set_xmlpath(self.path)
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def get_vol_object(self):
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return self._storage_backend.get_vol_object()
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def get_vol_install(self):
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return self._storage_backend.get_vol_install()
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def get_parent_pool(self):
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if self.get_vol_install():
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return self.get_vol_install().pool
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return self._storage_backend.get_parent_pool()
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def get_size(self):
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return self._storage_backend.get_size()
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#############################
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# Internal defaults helpers #
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#############################
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def _get_default_driver_name(self):
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if not self.path:
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return None
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|
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# Recommended xen defaults from here:
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# https://bugzilla.redhat.com/show_bug.cgi?id=1171550#c9
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# If type block, use name=phy. Otherwise do the same as qemu
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if self.conn.is_xen() and self.type == self.TYPE_BLOCK:
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return self.DRIVER_NAME_PHY
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if self.conn.check_support(
|
|
self.conn.SUPPORT_CONN_DISK_DRIVER_NAME_QEMU):
|
|
return self.DRIVER_NAME_QEMU
|
|
return None
|
|
|
|
def _get_default_driver_type(self):
|
|
"""
|
|
Set driver type from passed parameters
|
|
|
|
Where possible, we want to force /driver/@type = "raw" if installing
|
|
a QEMU VM. Without telling QEMU to expect a raw file, the emulator
|
|
is forced to autodetect, which has security implications:
|
|
|
|
http://lists.gnu.org/archive/html/qemu-devel/2008-04/msg00675.html
|
|
"""
|
|
if self.driver_name != self.DRIVER_NAME_QEMU:
|
|
return None
|
|
|
|
drvtype = self._storage_backend.get_driver_type()
|
|
return _qemu_sanitize_drvtype(self.type, drvtype)
|
|
|
|
|
|
#############################
|
|
# XML source media handling #
|
|
#############################
|
|
|
|
_source_file = XMLProperty("./source/@file")
|
|
_source_dev = XMLProperty("./source/@dev")
|
|
_source_dir = XMLProperty("./source/@dir")
|
|
|
|
source_pool = XMLProperty("./source/@pool")
|
|
source_volume = XMLProperty("./source/@volume")
|
|
|
|
source_name = XMLProperty("./source/@name")
|
|
source_protocol = XMLProperty("./source/@protocol")
|
|
# Technically multiple host lines can be listed
|
|
source_host_name = XMLProperty("./source/host/@name")
|
|
source_host_port = XMLProperty("./source/host/@port", is_int=True)
|
|
source_host_transport = XMLProperty("./source/host/@transport")
|
|
source_host_socket = XMLProperty("./source/host/@socket")
|
|
|
|
def _set_source_network_from_url(self, uri):
|
|
from .uri import URI
|
|
uriobj = URI(uri)
|
|
|
|
if uriobj.scheme:
|
|
self.source_protocol = uriobj.scheme
|
|
if uriobj.transport:
|
|
self.source_host_transport = uriobj.transport
|
|
if uriobj.hostname:
|
|
self.source_host_name = uriobj.hostname
|
|
if uriobj.port:
|
|
self.source_host_port = uriobj.port
|
|
if uriobj.path:
|
|
if self.source_host_transport:
|
|
self.source_host_socket = uriobj.path
|
|
else:
|
|
self.source_name = uriobj.path
|
|
if self.source_name.startswith("/"):
|
|
self.source_name = self.source_name[1:]
|
|
|
|
def _set_source_network_from_storage(self, volxml, poolxml):
|
|
self.source_protocol = poolxml.type
|
|
if poolxml.hosts:
|
|
self.source_host_name = poolxml.hosts[0].name
|
|
self.source_host_port = poolxml.hosts[0].port
|
|
|
|
path = ""
|
|
if poolxml.source_name:
|
|
path += poolxml.source_name
|
|
if poolxml.source_path:
|
|
path += poolxml.source_path
|
|
if not path.endswith('/'):
|
|
path += "/"
|
|
path += volxml.name
|
|
self.source_name = path
|
|
self.type = "network"
|
|
|
|
def _set_network_source_from_backend(self):
|
|
if (self._storage_backend.get_vol_object() or
|
|
self._storage_backend.get_vol_install()):
|
|
volxml = self._storage_backend.get_vol_xml()
|
|
poolxml = self._storage_backend.get_parent_pool_xml()
|
|
self._set_source_network_from_storage(volxml, poolxml)
|
|
elif self._storage_backend.get_path():
|
|
self._set_source_network_from_url(self._storage_backend.get_path())
|
|
|
|
def _build_url_from_network_source(self):
|
|
ret = self.source_protocol
|
|
if self.source_host_transport:
|
|
ret += "+%s" % self.source_host_transport
|
|
ret += "://"
|
|
if self.source_host_name:
|
|
ret += self.source_host_name
|
|
if self.source_host_port:
|
|
ret += ":" + str(self.source_host_port)
|
|
if self.source_name:
|
|
if not self.source_name.startswith("/"):
|
|
ret += "/"
|
|
ret += self.source_name
|
|
elif self.source_host_socket:
|
|
if not self.source_host_socket.startswith("/"):
|
|
ret += "/"
|
|
ret += self.source_host_socket
|
|
return ret
|
|
|
|
def _get_default_type(self):
|
|
if self.source_pool or self.source_volume:
|
|
return VirtualDisk.TYPE_VOLUME
|
|
if self._storage_backend:
|
|
return self._storage_backend.get_dev_type()
|
|
if self.source_protocol:
|
|
return VirtualDisk.TYPE_NETWORK
|
|
return self.TYPE_FILE
|
|
type = XMLProperty("./@type", default_cb=_get_default_type)
|
|
|
|
def _clear_source_xml(self):
|
|
"""
|
|
Unset all XML properties that describe the actual source media
|
|
"""
|
|
self._source_file = None
|
|
self._source_dev = None
|
|
self._source_dir = None
|
|
self.source_volume = None
|
|
self.source_pool = None
|
|
self.source_name = None
|
|
self.source_protocol = None
|
|
self.source_host_name = None
|
|
self.source_host_port = None
|
|
self.source_host_transport = None
|
|
self.source_host_socket = None
|
|
|
|
def _disk_type_to_object_prop_name(self):
|
|
disk_type = self.type
|
|
if disk_type == VirtualDisk.TYPE_BLOCK:
|
|
return "_source_dev"
|
|
elif disk_type == VirtualDisk.TYPE_DIR:
|
|
return "_source_dir"
|
|
elif disk_type == VirtualDisk.TYPE_FILE:
|
|
return "_source_file"
|
|
return None
|
|
|
|
|
|
# _xmlpath is an abstraction for source file/block/dir paths, since
|
|
# they don't have any special properties aside from needing to match
|
|
# 'type' value with the source property used.
|
|
def _get_xmlpath(self):
|
|
if self._source_file:
|
|
return self._source_file
|
|
if self._source_dev:
|
|
return self._source_dev
|
|
if self._source_dir:
|
|
return self._source_dir
|
|
return None
|
|
def _set_xmlpath(self, val):
|
|
self._clear_source_xml()
|
|
|
|
if self._storage_backend.get_dev_type() == "network":
|
|
self._set_network_source_from_backend()
|
|
return
|
|
|
|
propname = self._disk_type_to_object_prop_name()
|
|
if not propname:
|
|
return
|
|
return setattr(self, propname, val)
|
|
|
|
|
|
##################
|
|
# XML properties #
|
|
##################
|
|
|
|
device = XMLProperty("./@device",
|
|
default_cb=lambda s: s.DEVICE_DISK)
|
|
driver_name = XMLProperty("./driver/@name",
|
|
default_cb=_get_default_driver_name)
|
|
driver_type = XMLProperty("./driver/@type",
|
|
default_cb=_get_default_driver_type)
|
|
|
|
sgio = XMLProperty("./@sgio")
|
|
|
|
bus = XMLProperty("./target/@bus")
|
|
target = XMLProperty("./target/@dev")
|
|
removable = XMLProperty("./target/@removable", is_onoff=True)
|
|
|
|
read_only = XMLProperty("./readonly", is_bool=True)
|
|
shareable = XMLProperty("./shareable", is_bool=True)
|
|
driver_cache = XMLProperty("./driver/@cache")
|
|
driver_discard = XMLProperty("./driver/@discard")
|
|
driver_io = XMLProperty("./driver/@io")
|
|
|
|
error_policy = XMLProperty("./driver/@error_policy")
|
|
serial = XMLProperty("./serial")
|
|
startup_policy = XMLProperty("./source/@startupPolicy")
|
|
|
|
iotune_rbs = XMLProperty("./iotune/read_bytes_sec", is_int=True)
|
|
iotune_ris = XMLProperty("./iotune/read_iops_sec", is_int=True)
|
|
iotune_tbs = XMLProperty("./iotune/total_bytes_sec", is_int=True)
|
|
iotune_tis = XMLProperty("./iotune/total_iops_sec", is_int=True)
|
|
iotune_wbs = XMLProperty("./iotune/write_bytes_sec", is_int=True)
|
|
iotune_wis = XMLProperty("./iotune/write_iops_sec", is_int=True)
|
|
|
|
seclabel = XMLChildProperty(Seclabel, relative_xpath="./source")
|
|
|
|
|
|
#################################
|
|
# Validation assistance methods #
|
|
#################################
|
|
|
|
def _set_default_storage_backend(self):
|
|
path = None
|
|
vol_object = None
|
|
parent_pool = None
|
|
typ = self._get_default_type()
|
|
|
|
if self.type == VirtualDisk.TYPE_NETWORK:
|
|
# Fill in a completed URL for virt-manager UI, path comparison, etc
|
|
path = self._build_url_from_network_source()
|
|
|
|
if typ == VirtualDisk.TYPE_VOLUME:
|
|
conn = self.conn
|
|
if "weakref" in str(type(conn)):
|
|
conn = conn()
|
|
|
|
try:
|
|
parent_pool = conn.storagePoolLookupByName(self.source_pool)
|
|
vol_object = parent_pool.storageVolLookupByName(
|
|
self.source_volume)
|
|
except:
|
|
logging.debug("Error fetching source pool=%s vol=%s",
|
|
self.source_pool, self.source_volume, exc_info=True)
|
|
|
|
if vol_object is None and path is None:
|
|
path = self._get_xmlpath()
|
|
|
|
self._change_backend(path, vol_object, parent_pool)
|
|
|
|
def set_local_disk_to_clone(self, disk, sparse):
|
|
"""
|
|
Set a path to manually clone (as in, not through libvirt)
|
|
"""
|
|
self._storage_backend = diskbackend.CloneStorageCreator(self.conn,
|
|
self.path, disk.path, disk.get_size(), sparse)
|
|
|
|
def is_cdrom(self):
|
|
return self.device == self.DEVICE_CDROM
|
|
def is_floppy(self):
|
|
return self.device == self.DEVICE_FLOPPY
|
|
def is_disk(self):
|
|
return self.device == self.DEVICE_DISK
|
|
|
|
def can_be_empty(self):
|
|
return self.is_floppy() or self.is_cdrom()
|
|
|
|
def _change_backend(self, path, vol_object, parent_pool):
|
|
backend = diskbackend.StorageBackend(self.conn, path,
|
|
vol_object, parent_pool)
|
|
self._storage_backend = backend
|
|
|
|
def sync_path_props(self):
|
|
"""
|
|
Fills in the values of type, driver_type, and driver_name for
|
|
the associated backing storage. This needs to be manually called
|
|
if changing an existing disk's media.
|
|
"""
|
|
path = self._get_xmlpath()
|
|
|
|
self.type = self._get_default_type()
|
|
self.driver_name = self._get_default_driver_name()
|
|
self.driver_type = self._get_default_driver_type()
|
|
|
|
# Need to retrigger this if self.type changed
|
|
if path:
|
|
self._set_xmlpath(path)
|
|
|
|
def wants_storage_creation(self):
|
|
"""
|
|
If true, this disk needs storage creation parameters or things
|
|
will error.
|
|
"""
|
|
return (self._storage_backend and
|
|
not self._storage_backend.exists())
|
|
|
|
def validate(self):
|
|
if self.path is None:
|
|
if not self.can_be_empty():
|
|
raise ValueError(_("Device type '%s' requires a path") %
|
|
self.device)
|
|
|
|
return
|
|
|
|
if (self.type == VirtualDisk.TYPE_DIR and
|
|
not self.is_floppy()):
|
|
raise ValueError(_("The path '%s' must be a file or a "
|
|
"device, not a directory") % self.path)
|
|
|
|
if not self._storage_backend:
|
|
return
|
|
|
|
if (not self._storage_backend.will_create_storage() and
|
|
not self._storage_backend.exists()):
|
|
raise ValueError(
|
|
_("Must specify storage creation parameters for "
|
|
"non-existent path '%s'.") % self.path)
|
|
|
|
self._storage_backend.validate(self)
|
|
|
|
def setup(self, meter=None):
|
|
"""
|
|
Build storage (if required)
|
|
|
|
If storage doesn't exist (a non-existent file 'path', or 'vol_install'
|
|
was specified), we create it.
|
|
"""
|
|
if not self._storage_backend.will_create_storage():
|
|
return
|
|
|
|
meter = util.ensure_meter(meter)
|
|
vol_object = self._storage_backend.create(meter)
|
|
self.storage_was_created = True
|
|
if not vol_object:
|
|
return
|
|
|
|
parent_pool = self.get_vol_install().pool
|
|
self._change_backend(None, vol_object, parent_pool)
|
|
|
|
def set_defaults(self, guest):
|
|
if self.is_cdrom():
|
|
self.read_only = True
|
|
|
|
if self.is_cdrom() and guest.os.is_s390x():
|
|
self.bus = "scsi"
|
|
|
|
if not self.conn.is_qemu():
|
|
return
|
|
if not self.is_disk():
|
|
return
|
|
if not self.type == self.TYPE_BLOCK:
|
|
return
|
|
|
|
# Enable cache=none and io=native for block devices. Would
|
|
# be nice if qemu did this for us but that time has long passed.
|
|
if not self.driver_cache:
|
|
self.driver_cache = self.CACHE_MODE_NONE
|
|
if not self.driver_io:
|
|
self.driver_io = self.IO_MODE_NATIVE
|
|
|
|
|
|
def is_size_conflict(self):
|
|
"""
|
|
reports if disk size conflicts with available space
|
|
|
|
returns a two element tuple:
|
|
1. first element is True if fatal conflict occurs
|
|
2. second element is a string description of the conflict or None
|
|
Non fatal conflicts (sparse disk exceeds available space) will
|
|
return (False, "description of collision")
|
|
"""
|
|
return self._storage_backend.is_size_conflict()
|
|
|
|
def is_conflict_disk(self, conn=None):
|
|
"""
|
|
check if specified storage is in use by any other VMs on passed
|
|
connection.
|
|
|
|
@return: list of colliding VM names
|
|
@rtype: C{list}
|
|
"""
|
|
if not self.path:
|
|
return False
|
|
if not conn:
|
|
conn = self.conn
|
|
|
|
ret = self.path_in_use_by(conn, self.path,
|
|
shareable=self.shareable,
|
|
read_only=self.read_only)
|
|
return ret
|
|
|
|
|
|
def get_target_prefix(self, used_targets=None):
|
|
"""
|
|
Returns the suggested disk target prefix (hd, xvd, sd ...) for the
|
|
disk.
|
|
@returns: str prefix, or None if no reasonable guess can be made
|
|
"""
|
|
# The upper limits here aren't necessarilly 1024, but let the HV
|
|
# error as appropriate.
|
|
def _return(prefix):
|
|
nummap = {
|
|
"vd": 1024,
|
|
"xvd": 1024,
|
|
"fd": 2,
|
|
"hd": 4,
|
|
"sd": 1024,
|
|
}
|
|
return prefix, nummap[prefix]
|
|
|
|
if self.bus == "virtio":
|
|
return _return("vd")
|
|
elif self.bus == "xen":
|
|
return _return("xvd")
|
|
elif self.bus == "fdc" or self.is_floppy():
|
|
return _return("fd")
|
|
elif self.bus == "ide":
|
|
return _return("hd")
|
|
elif self.bus or not used_targets:
|
|
# sata, scsi, usb, sd
|
|
return _return("sd")
|
|
|
|
# If guest already has some disks defined
|
|
preforder = ["vd", "xvd", "sd", "hd"]
|
|
for pref in preforder:
|
|
for target in used_targets:
|
|
if target.startswith(pref):
|
|
return _return(pref)
|
|
return _return("sd")
|
|
|
|
def generate_target(self, skip_targets, pref_ctrl=None):
|
|
"""
|
|
Generate target device ('hda', 'sdb', etc..) for disk, excluding
|
|
any targets in 'skip_targets'. If given the 'pref_ctrl'
|
|
parameter, it tries to select the target so that the disk is
|
|
mapped onto that controller.
|
|
Sets self.target, and returns the generated value.
|
|
|
|
@param skip_targets: list of targets to exclude
|
|
@type skip_targets: C{list}
|
|
@param pref_ctrl: preferred controller to connect the disk to
|
|
@type pref_ctrl: C{int}
|
|
@raise ValueError: can't determine target type, no targets available
|
|
@returns generated target
|
|
@rtype C{str}
|
|
"""
|
|
prefix, maxnode = self.get_target_prefix(skip_targets)
|
|
skip_targets = [t for t in skip_targets if t and t.startswith(prefix)]
|
|
skip_targets.sort()
|
|
|
|
def get_target():
|
|
first_found = None
|
|
|
|
ran = range(maxnode)
|
|
if pref_ctrl is not None:
|
|
# We assume narrow SCSI bus and libvirt assigning 7
|
|
# (1-7, 8-14, etc.) devices per controller
|
|
ran = range(pref_ctrl * 7, (pref_ctrl + 1) * 7)
|
|
|
|
for i in ran:
|
|
gen_t = prefix + self.num_to_target(i + 1)
|
|
if gen_t in skip_targets:
|
|
skip_targets.remove(gen_t)
|
|
continue
|
|
if not skip_targets:
|
|
return gen_t
|
|
elif not first_found:
|
|
first_found = gen_t
|
|
if first_found:
|
|
return first_found
|
|
|
|
ret = get_target()
|
|
if ret:
|
|
self.target = ret
|
|
return ret
|
|
|
|
if pref_ctrl is not None:
|
|
# This basically means that we either chose full
|
|
# controller or didn't add any
|
|
raise ValueError(_("Controller number %d for disk of type %s has "
|
|
"no empty slot to use" % (pref_ctrl, prefix)))
|
|
else:
|
|
raise ValueError(_("Only %s disks of type '%s' are supported"
|
|
% (maxnode, prefix)))
|
|
|
|
VirtualDisk.register_type()
|