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#!/usr/bin/python
import json
import mmap
import os
import subprocess
def get_data_pool():
cmd = ['ceph', 'fs', 'ls', '--format=json-pretty']
proc = subprocess.Popen(cmd, stdout=subprocess.PIPE)
out = proc.communicate()[0]
return json.loads(out)[0]['data_pools'][0]
def main():
fd = os.open("testfile", os.O_RDWR | os.O_CREAT | os.O_TRUNC | os.O_DIRECT, 0o644)
ino = os.fstat(fd).st_ino
obj_name = "{ino:x}.00000000".format(ino=ino)
pool_name = get_data_pool()
buf = mmap.mmap(-1, 1)
buf.write('1')
os.write(fd, buf)
proc = subprocess.Popen(['rados', '-p', pool_name, 'get', obj_name, 'tmpfile'])
proc.wait()
with open('tmpfile', 'r') as tmpf:
out = tmpf.read()
if out != '1':
raise RuntimeError("data were not written to object store directly")
with open('tmpfile', 'w') as tmpf:
tmpf.write('2')
proc = subprocess.Popen(['rados', '-p', pool_name, 'put', obj_name, 'tmpfile'])
proc.wait()
os.lseek(fd, 0, os.SEEK_SET)
out = os.read(fd, 1)
if out != '2':
raise RuntimeError("data were not directly read from object store")
os.close(fd)
print('ok')
main()
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