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#
# dm.py
# device-mapper functions
#
# Copyright (C) 2009 Red Hat, Inc. All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# Author(s): Dave Lehman <dlehman@redhat.com>
#
import os
import block
from .. import util
from ..errors import *
import gettext
_ = lambda x: gettext.ldgettext("anaconda", x)
import logging
log = logging.getLogger("storage")
def dm_setup(args):
ret = util.run_program(["dmsetup"] + args)
if ret:
raise DMError("Failed to run dmsetup %s" % " ".join(args))
def dm_create_linear(map_name, device, length, uuid):
table = "0 %d linear %s 0" % (length, device)
args = ["create", map_name, "--uuid", uuid, "--table", "%s" % table]
dm_setup(args)
def dm_remove(map_name):
args = ["remove", map_name]
dm_setup(args)
def name_from_dm_node(dm_node):
# first, try sysfs
name_file = "/sys/class/block/%s/dm/name" % dm_node
try:
name = open(name_file).read().strip()
except IOError:
# next, try pyblock
name = block.getNameFromDmNode(dm_node)
return name
def dm_node_from_name(map_name):
named_path = "/dev/mapper/%s" % map_name
try:
# /dev/mapper/ nodes are usually symlinks to /dev/dm-N
node = os.path.basename(os.readlink(named_path))
except OSError:
try:
# dm devices' names are based on the block device minor
st = os.stat(named_path)
minor = os.minor(st.st_rdev)
node = "dm-%d" % minor
except OSError:
# try pyblock
node = block.getDmNodeFromName(map_name)
if not node:
raise DMError("dm_node_from_name(%s) has failed." % node)
return node
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