1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
|
# vim: tabstop=4 shiftwidth=4 softtabstop=4
# (c) Copyright 2013 Hewlett-Packard Development Company, L.P.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""Generic linux scsi subsystem utilities."""
from nova.openstack.common import log as logging
from nova.openstack.common import loopingcall
from nova.openstack.common import processutils
from nova import utils
LOG = logging.getLogger(__name__)
def echo_scsi_command(path, content):
"""Used to echo strings to scsi subsystem."""
args = ["-a", path]
kwargs = dict(process_input=content, run_as_root=True)
utils.execute('tee', *args, **kwargs)
def rescan_hosts(hbas):
for hba in hbas:
echo_scsi_command("/sys/class/scsi_host/%s/scan"
% hba['host_device'], "- - -")
def get_device_list():
(out, err) = utils.execute('sginfo', '-r', run_as_root=True)
devices = []
if out:
line = out.strip()
devices = line.split(" ")
return devices
def get_device_info(device):
(out, err) = utils.execute('sg_scan', device, run_as_root=True)
dev_info = {'device': device, 'host': None,
'channel': None, 'id': None, 'lun': None}
if out:
line = out.strip()
line = line.replace(device + ": ", "")
info = line.split(" ")
for item in info:
if '=' in item:
pair = item.split('=')
dev_info[pair[0]] = pair[1]
elif 'scsi' in item:
dev_info['host'] = item.replace('scsi', '')
return dev_info
def _wait_for_remove(device, tries):
tries = tries + 1
LOG.debug(_("Trying (%(tries)s) to remove device %(device)s")
% {'tries': tries, 'device': device["device"]})
path = "/sys/bus/scsi/drivers/sd/%s:%s:%s:%s/delete"
echo_scsi_command(path % (device["host"], device["channel"],
device["id"], device["lun"]),
"1")
devices = get_device_list()
if device["device"] not in devices:
raise loopingcall.LoopingCallDone()
def remove_device(device):
tries = 0
timer = loopingcall.FixedIntervalLoopingCall(_wait_for_remove, device,
tries)
timer.start(interval=2).wait()
timer.stop()
def find_multipath_device(device):
"""Try and discover the multipath device for a volume."""
mdev = None
devices = []
out = None
try:
(out, err) = utils.execute('multipath', '-l', device,
run_as_root=True)
except processutils.ProcessExecutionError as exc:
LOG.warn(_("Multipath call failed exit (%(code)s)")
% {'code': exc.exit_code})
return None
if out:
lines = out.strip()
lines = lines.split("\n")
if lines:
line = lines[0]
info = line.split(" ")
# device line output is different depending
# on /etc/multipath.conf settings.
if info[1][:2] == "dm":
mdev = "/dev/%s" % info[1]
mdev_id = info[0]
elif info[2][:2] == "dm":
mdev = "/dev/%s" % info[2]
mdev_id = info[1].replace('(', '')
mdev_id = mdev_id.replace(')', '')
if mdev is None:
LOG.warn(_("Couldn't find multipath device %(line)s")
% locals())
return None
LOG.debug(_("Found multipath device = %(mdev)s") % locals())
device_lines = lines[3:]
for dev_line in device_lines:
if dev_line.find("policy") != -1:
continue
dev_line = dev_line.lstrip(' |-`')
dev_info = dev_line.split()
address = dev_info[0].split(":")
dev = {'device': '/dev/%s' % dev_info[1],
'host': address[0], 'channel': address[1],
'id': address[2], 'lun': address[3]
}
devices.append(dev)
if mdev is not None:
info = {"device": mdev,
"id": mdev_id,
"devices": devices}
return info
return None
|
