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import os
import errno
import logging
from ceph.deployment.service_spec import ServiceSpec, PlacementSpec
import cephfs
import orchestrator
from .exception import VolumeException
log = logging.getLogger(__name__)
def create_pool(mgr, pool_name):
# create the given pool
command = {'prefix': 'osd pool create', 'pool': pool_name}
return mgr.mon_command(command)
def remove_pool(mgr, pool_name):
command = {'prefix': 'osd pool rm', 'pool': pool_name, 'pool2': pool_name,
'yes_i_really_really_mean_it': True}
return mgr.mon_command(command)
def create_filesystem(mgr, fs_name, metadata_pool, data_pool):
command = {'prefix': 'fs new', 'fs_name': fs_name, 'metadata': metadata_pool,
'data': data_pool}
return mgr.mon_command(command)
def remove_filesystem(mgr, fs_name):
command = {'prefix': 'fs fail', 'fs_name': fs_name}
r, outb, outs = mgr.mon_command(command)
if r != 0:
return r, outb, outs
command = {'prefix': 'fs rm', 'fs_name': fs_name, 'yes_i_really_mean_it': True}
return mgr.mon_command(command)
def create_mds(mgr, fs_name, placement):
spec = ServiceSpec(service_type='mds',
service_id=fs_name,
placement=PlacementSpec.from_string(placement))
try:
completion = mgr.apply([spec], no_overwrite=True)
orchestrator.raise_if_exception(completion)
except (ImportError, orchestrator.OrchestratorError):
return 0, "", "Volume created successfully (no MDS daemons created)"
except Exception as e:
# Don't let detailed orchestrator exceptions (python backtraces)
# bubble out to the user
log.exception("Failed to create MDS daemons")
return -errno.EINVAL, "", str(e)
return 0, "", ""
def volume_exists(mgr, fs_name):
fs_map = mgr.get('fs_map')
for fs in fs_map['filesystems']:
if fs['mdsmap']['fs_name'] == fs_name:
return True
return False
def listdir(fs, dirpath, filter_entries=None):
"""
Get the directory names (only dirs) for a given path
"""
dirs = []
if filter_entries is None:
filter_entries = [b".", b".."]
else:
filter_entries.extend([b".", b".."])
try:
with fs.opendir(dirpath) as dir_handle:
d = fs.readdir(dir_handle)
while d:
if (d.d_name not in filter_entries) and d.is_dir():
dirs.append(d.d_name)
d = fs.readdir(dir_handle)
except cephfs.Error as e:
raise VolumeException(-e.args[0], e.args[1])
return dirs
def has_subdir(fs, dirpath, filter_entries=None):
"""
Check the presence of directory (only dirs) for a given path
"""
res = False
if filter_entries is None:
filter_entries = [b".", b".."]
else:
filter_entries.extend([b".", b".."])
try:
with fs.opendir(dirpath) as dir_handle:
d = fs.readdir(dir_handle)
while d:
if (d.d_name not in filter_entries) and d.is_dir():
res = True
break
d = fs.readdir(dir_handle)
except cephfs.Error as e:
raise VolumeException(-e.args[0], e.args[1])
return res
def is_inherited_snap(snapname):
"""
Returns True if the snapname is inherited else False
"""
return snapname.startswith("_")
def listsnaps(fs, volspec, snapdirpath, filter_inherited_snaps=False):
"""
Get the snap names from a given snap directory path
"""
if os.path.basename(snapdirpath) != volspec.snapshot_prefix.encode('utf-8'):
raise VolumeException(-errno.EINVAL, "Not a snap directory: {0}".format(snapdirpath))
snaps = []
try:
with fs.opendir(snapdirpath) as dir_handle:
d = fs.readdir(dir_handle)
while d:
if (d.d_name not in (b".", b"..")) and d.is_dir():
d_name = d.d_name.decode('utf-8')
if not is_inherited_snap(d_name):
snaps.append(d.d_name)
elif is_inherited_snap(d_name) and not filter_inherited_snaps:
snaps.append(d.d_name)
d = fs.readdir(dir_handle)
except cephfs.Error as e:
raise VolumeException(-e.args[0], e.args[1])
return snaps
def list_one_entry_at_a_time(fs, dirpath):
"""
Get a directory entry (one entry a time)
"""
try:
with fs.opendir(dirpath) as dir_handle:
d = fs.readdir(dir_handle)
while d:
if d.d_name not in (b".", b".."):
yield d
d = fs.readdir(dir_handle)
except cephfs.Error as e:
raise VolumeException(-e.args[0], e.args[1])
def copy_file(fs, src, dst, mode, cancel_check=None):
"""
Copy a regular file from @src to @dst. @dst is overwritten if it exists.
"""
src_fd = dst_fd = None
try:
src_fd = fs.open(src, os.O_RDONLY);
dst_fd = fs.open(dst, os.O_CREAT | os.O_TRUNC | os.O_WRONLY, mode)
except cephfs.Error as e:
if src_fd is not None:
fs.close(src_fd)
if dst_fd is not None:
fs.close(dst_fd)
raise VolumeException(-e.args[0], e.args[1])
IO_SIZE = 8 * 1024 * 1024
try:
while True:
if cancel_check and cancel_check():
raise VolumeException(-errno.EINTR, "copy operation interrupted")
data = fs.read(src_fd, -1, IO_SIZE)
if not len(data):
break
written = 0
while written < len(data):
written += fs.write(dst_fd, data[written:], -1)
fs.fsync(dst_fd, 0)
except cephfs.Error as e:
raise VolumeException(-e.args[0], e.args[1])
finally:
fs.close(src_fd)
fs.close(dst_fd)
def get_ancestor_xattr(fs, path, attr):
"""
Helper for reading layout information: if this xattr is missing
on the requested path, keep checking parents until we find it.
"""
try:
return fs.getxattr(path, attr).decode('utf-8')
except cephfs.NoData as e:
if path == "/":
raise VolumeException(-e.args[0], e.args[1])
else:
return get_ancestor_xattr(fs, os.path.split(path)[0], attr)
def create_base_dir(fs, path, mode):
"""
Create volspec base/group directory if it doesn't exist
"""
try:
fs.stat(path)
except cephfs.Error as e:
if e.args[0] == errno.ENOENT:
fs.mkdirs(path, mode)
else:
raise VolumeException(-e.args[0], e.args[1])
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