storage/devicelibs/dm.py

#
# 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
import iutil
from ..errors import *

import gettext
_ = lambda x: gettext.ldgettext("anaconda", x)

import logging
log = logging.getLogger("storage")

def name_from_dm_node(dm_node):
    name = block.getNameFromDmNode(dm_node)
    if name is not None:
        return name

    st = os.stat("/dev/%s" % dm_node)
    major = os.major(st.st_rdev)
    minor = os.minor(st.st_rdev)
    name = iutil.execWithCapture("dmsetup",
                                 ["info", "--columns",
                                  "--noheadings", "-o", "name",
                                  "-j", str(major), "-m", str(minor)],
                                 stderr="/dev/tty5")
    log.debug("name_from_dm(%s) returning '%s'" % (dm_node, name.strip()))
    return name.strip()

def dm_node_from_name(map_name):
    dm_node = block.getDmNodeFromName(map_name)
    if dm_node is not None:
        return dm_node

    devnum = iutil.execWithCapture("dmsetup",
                                   ["info", "--columns",
                                    "--noheadings",
                                    "-o", "devno",
                                    map_name],
                                    stderr="/dev/tty5")
    (major, sep, minor) = devnum.strip().partition(":")
    if not sep:
        raise DMError("dm device does not exist")

    dm_node = "dm-%d" % int(minor)
    log.debug("dm_node_from_name(%s) returning '%s'" % (map_name, dm_node))
    return dm_node

def dm_is_multipath(info):
    major = None
    minor = None

    if info.has_key('MAJOR'):
        major = info['MAJOR']
    elif info.has_key('DM_MAJOR'):
        major = info['DM_MAJOR']
    if info.has_key('MINOR'):
        minor = info['MINOR']
    elif info.has_key('DM_MINOR'):
        minor = info['DM_MINOR']

    if major is None or minor is None:
        return False

    for map in block.dm.maps():
        dev = map.dev
        if dev.major == int(major) and dev.minor == int(minor):
            for table in map.table:
                if table.type == 'multipath':
                    return True

def _get_backing_devnums_from_map(map_name):
    ret = []
    buf = iutil.execWithCapture("dmsetup",
                                ["info", "--columns",
                                 "--noheadings",
                                 "-o", "devnos_used",
                                 map_name],
                                stderr="/dev/tty5")
    dev_nums = buf.split()
    for dev_num in dev_nums:
        (major, colon, minor) = dev_num.partition(":")
        ret.append((int(major), int(minor)))

    return ret

def get_backing_devnums(dm_node):
    #dm_node = dm_node_from_name(map_name)
    if not dm_node:
        return None

    top_dir = "/sys/block"
    backing_devs = os.listdir("%s/%s/slaves/" % (top_dir, dm_node))
    dev_nums = []
    for backing_dev in backing_devs:
        dev_num = open("%s/%s/dev" % (top_dir, backing_dev)).read().strip()
        (_major, _minor) = dev_num.split(":")
        dev_nums.append((int(_major), int(_minor)))

    return dev_nums

def get_backing_devs_from_name(map_name):
    dm_node = dm_node_from_name(map_name)
    if not dm_node:
        return None

    slave_devs = os.listdir("/sys/block/virtual/%s" % dm_node)
    return slave_devs

1	#
2	# dm.py
3	# device-mapper functions
4	#
5	# Copyright (C) 2009 Red Hat, Inc. All rights reserved.
6	#
7	# This program is free software; you can redistribute it and/or modify
8	# it under the terms of the GNU General Public License as published by
9	# the Free Software Foundation; either version 2 of the License, or
10	# (at your option) any later version.
11	#
12	# This program is distributed in the hope that it will be useful,
13	# but WITHOUT ANY WARRANTY; without even the implied warranty of
14	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15	# GNU General Public License for more details.
16	#
17	# You should have received a copy of the GNU General Public License
18	# along with this program. If not, see <http://www.gnu.org/licenses/>.
19	#
20	# Author(s): Dave Lehman <dlehman@redhat.com>
21	#
22
23	import os
24
25	import block
26	import iutil
27	from ..errors import *
28
29	import gettext
30	_ = lambda x: gettext.ldgettext("anaconda", x)
31
32	import logging
33	log = logging.getLogger("storage")
34
35	def name_from_dm_node(dm_node):
36	name = block.getNameFromDmNode(dm_node)
37	if name is not None:
38	return name
39
40	st = os.stat("/dev/%s" % dm_node)
41	major = os.major(st.st_rdev)
42	minor = os.minor(st.st_rdev)
43	name = iutil.execWithCapture("dmsetup",
44	["info", "--columns",
45	"--noheadings", "-o", "name",
46	"-j", str(major), "-m", str(minor)],
47	stderr="/dev/tty5")
48	log.debug("name_from_dm(%s) returning '%s'" % (dm_node, name.strip()))
49	return name.strip()
50
51	def dm_node_from_name(map_name):
52	dm_node = block.getDmNodeFromName(map_name)
53	if dm_node is not None:
54	return dm_node
55
56	devnum = iutil.execWithCapture("dmsetup",
57	["info", "--columns",
58	"--noheadings",
59	"-o", "devno",
60	map_name],
61	stderr="/dev/tty5")
62	(major, sep, minor) = devnum.strip().partition(":")
63	if not sep:
64	raise DMError("dm device does not exist")
65
66	dm_node = "dm-%d" % int(minor)
67	log.debug("dm_node_from_name(%s) returning '%s'" % (map_name, dm_node))
68	return dm_node
69
70	def dm_is_multipath(info):
71	major = None
72	minor = None
73
74	if info.has_key('MAJOR'):
75	major = info['MAJOR']
76	elif info.has_key('DM_MAJOR'):
77	major = info['DM_MAJOR']
78	if info.has_key('MINOR'):
79	minor = info['MINOR']
80	elif info.has_key('DM_MINOR'):
81	minor = info['DM_MINOR']
82
83	if major is None or minor is None:
84	return False
85
86	for map in block.dm.maps():
87	dev = map.dev
88	if dev.major == int(major) and dev.minor == int(minor):
89	for table in map.table:
90	if table.type == 'multipath':
91	return True
92
93	def _get_backing_devnums_from_map(map_name):
94	ret = []
95	buf = iutil.execWithCapture("dmsetup",
96	["info", "--columns",
97	"--noheadings",
98	"-o", "devnos_used",
99	map_name],
100	stderr="/dev/tty5")
101	dev_nums = buf.split()
102	for dev_num in dev_nums:
103	(major, colon, minor) = dev_num.partition(":")
104	ret.append((int(major), int(minor)))
105
106	return ret
107
108	def get_backing_devnums(dm_node):
109	#dm_node = dm_node_from_name(map_name)
110	if not dm_node:
111	return None
112
113	top_dir = "/sys/block"
114	backing_devs = os.listdir("%s/%s/slaves/" % (top_dir, dm_node))
115	dev_nums = []
116	for backing_dev in backing_devs:
117	dev_num = open("%s/%s/dev" % (top_dir, backing_dev)).read().strip()
118	(_major, _minor) = dev_num.split(":")
119	dev_nums.append((int(_major), int(_minor)))
120
121	return dev_nums
122
123	def get_backing_devs_from_name(map_name):
124	dm_node = dm_node_from_name(map_name)
125	if not dm_node:
126	return None
127
128	slave_devs = os.listdir("/sys/block/virtual/%s" % dm_node)
129	return slave_devs
130