131 lines
4.0 KiB
Python
131 lines
4.0 KiB
Python
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#
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# dm.py
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# device-mapper functions
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#
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# Copyright (C) 2009 Red Hat, Inc. All rights reserved.
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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, see <http://www.gnu.org/licenses/>.
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#
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# Author(s): Dave Lehman <dlehman@redhat.com>
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#
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import os
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import block
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import iutil
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from ..errors import *
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import gettext
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_ = lambda x: gettext.ldgettext("anaconda", x)
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import logging
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log = logging.getLogger("storage")
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def name_from_dm_node(dm_node):
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name = block.getNameFromDmNode(dm_node)
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if name is not None:
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return name
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st = os.stat("/dev/%s" % dm_node)
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major = os.major(st.st_rdev)
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minor = os.minor(st.st_rdev)
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name = iutil.execWithCapture("dmsetup",
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["info", "--columns",
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"--noheadings", "-o", "name",
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"-j", str(major), "-m", str(minor)],
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stderr="/dev/tty5")
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log.debug("name_from_dm(%s) returning '%s'" % (dm_node, name.strip()))
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return name.strip()
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def dm_node_from_name(map_name):
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dm_node = block.getDmNodeFromName(map_name)
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if dm_node is not None:
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return dm_node
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devnum = iutil.execWithCapture("dmsetup",
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["info", "--columns",
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"--noheadings",
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"-o", "devno",
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map_name],
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stderr="/dev/tty5")
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(major, sep, minor) = devnum.strip().partition(":")
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if not sep:
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raise DMError("dm device does not exist")
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dm_node = "dm-%d" % int(minor)
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log.debug("dm_node_from_name(%s) returning '%s'" % (map_name, dm_node))
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return dm_node
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def dm_is_multipath(info):
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major = None
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minor = None
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if info.has_key('MAJOR'):
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major = info['MAJOR']
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elif info.has_key('DM_MAJOR'):
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major = info['DM_MAJOR']
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if info.has_key('MINOR'):
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minor = info['MINOR']
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elif info.has_key('DM_MINOR'):
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minor = info['DM_MINOR']
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if major is None or minor is None:
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return False
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for map in block.dm.maps():
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dev = map.dev
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if dev.major == int(major) and dev.minor == int(minor):
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for table in map.table:
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if table.type == 'multipath':
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return True
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def _get_backing_devnums_from_map(map_name):
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ret = []
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buf = iutil.execWithCapture("dmsetup",
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["info", "--columns",
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"--noheadings",
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"-o", "devnos_used",
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map_name],
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stderr="/dev/tty5")
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dev_nums = buf.split()
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for dev_num in dev_nums:
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(major, colon, minor) = dev_num.partition(":")
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ret.append((int(major), int(minor)))
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return ret
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def get_backing_devnums(dm_node):
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#dm_node = dm_node_from_name(map_name)
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if not dm_node:
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return None
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top_dir = "/sys/block"
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backing_devs = os.listdir("%s/%s/slaves/" % (top_dir, dm_node))
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dev_nums = []
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for backing_dev in backing_devs:
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dev_num = open("%s/%s/dev" % (top_dir, backing_dev)).read().strip()
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(_major, _minor) = dev_num.split(":")
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dev_nums.append((int(_major), int(_minor)))
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return dev_nums
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def get_backing_devs_from_name(map_name):
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dm_node = dm_node_from_name(map_name)
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if not dm_node:
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return None
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slave_devs = os.listdir("/sys/block/virtual/%s" % dm_node)
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return slave_devs
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