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
|
# Copyright (C) 2019 Red Hat, Inc.
#
# 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.
from __future__ import print_function
import pwd
import grp
import os
import time
import signal
import tempfile
import sanlock
HOST_ID = 1
LOCKSPACE_NAME = "lockspace1"
RESOURCE_NAME = "resource1"
def sigTermHandler():
print("SIGTERM signal received")
def main():
signal.signal(signal.SIGTERM, sigTermHandler)
print("Creating the sanlock disk")
fd, disk = tempfile.mkstemp()
os.close(fd)
os.chown(
disk, pwd.getpwnam("sanlock").pw_uid, grp.getgrnam("sanlock").gr_gid)
offset = sanlock.get_alignment(disk)
SNLK_DISKS = [(disk, offset)]
print("Registering to sanlock")
fd = sanlock.register()
print("Initializing '%s'" % (LOCKSPACE_NAME,))
sanlock.write_lockspace(LOCKSPACE_NAME, disk, align=1048576, sector=512)
print("Initializing '%s' on '%s'" % (RESOURCE_NAME, LOCKSPACE_NAME))
sanlock.write_resource(
LOCKSPACE_NAME, RESOURCE_NAME, SNLK_DISKS, align=1048576, sector=512)
print("Acquiring the id '%i' on '%s'" % (HOST_ID, LOCKSPACE_NAME))
sanlock.add_lockspace(LOCKSPACE_NAME, HOST_ID, disk)
try:
print("Acquiring '%s' on '%s'" % (RESOURCE_NAME, LOCKSPACE_NAME))
sanlock.acquire(
LOCKSPACE_NAME, RESOURCE_NAME, SNLK_DISKS, slkfd=fd, version=0)
while True:
print("Trying to get lockspace '%s' hosts" % LOCKSPACE_NAME)
try:
hosts_list = sanlock.get_hosts(LOCKSPACE_NAME)
except sanlock.SanlockException as e:
if e.errno != os.errno.EAGAIN:
raise
else:
print("Lockspace '%s' hosts: " % LOCKSPACE_NAME, hosts_list)
break
time.sleep(5)
owners = sanlock.read_resource_owners(
LOCKSPACE_NAME,
RESOURCE_NAME,
SNLK_DISKS,
align=1048576,
sector=512)
print("Resource '%s' owners: %s" % (RESOURCE_NAME, owners))
print("Releasing '%s' on '%s'" % (RESOURCE_NAME, LOCKSPACE_NAME))
sanlock.release(LOCKSPACE_NAME, RESOURCE_NAME, SNLK_DISKS, slkfd=fd)
except Exception as e:
print("Exception: ", e)
finally:
print("Releasing the id '%i' on '%s'" % (HOST_ID, LOCKSPACE_NAME))
sanlock.rem_lockspace(LOCKSPACE_NAME, HOST_ID, disk)
print("Removing the sanlock disk")
os.remove(disk)
if __name__ == '__main__':
main()
|
