7f7014862e
Change-Id: Ifee5dccd47a3e301812533851c45b9fe853f9b71 Signed-off-by: Luis Pabon <lpabon@redhat.com> Reviewed-on: http://review.gluster.org/4983 Reviewed-by: Peter Portante <pportant@redhat.com> Tested-by: Peter Portante <pportant@redhat.com>
145 lines
4.7 KiB
Python
145 lines
4.7 KiB
Python
# Copyright (c) 2012 Red Hat, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import logging
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import os, sys, fcntl, time, errno
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from ConfigParser import ConfigParser, NoSectionError, NoOptionError
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from swift.common.utils import TRUE_VALUES, search_tree
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from gluster.swift.common.fs_utils import mkdirs
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#
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# Read the fs.conf file once at startup (module load)
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#
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_fs_conf = ConfigParser()
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MOUNT_IP = 'localhost'
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OBJECT_ONLY = False
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RUN_DIR='/var/run/swift'
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SWIFT_DIR = '/etc/swift'
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_do_getsize = False
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if _fs_conf.read(os.path.join('/etc/swift', 'fs.conf')):
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try:
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MOUNT_IP = _fs_conf.get('DEFAULT', 'mount_ip', 'localhost')
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except (NoSectionError, NoOptionError):
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pass
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try:
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OBJECT_ONLY = _fs_conf.get('DEFAULT', 'object_only', "no") in TRUE_VALUES
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except (NoSectionError, NoOptionError):
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pass
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try:
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RUN_DIR = _fs_conf.get('DEFAULT', 'run_dir', '/var/run/swift')
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except (NoSectionError, NoOptionError):
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pass
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try:
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_do_getsize = _fs_conf.get('DEFAULT', 'accurate_size_in_listing', \
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"no") in TRUE_VALUES
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except (NoSectionError, NoOptionError):
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pass
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NAME = 'glusterfs'
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def _busy_wait(full_mount_path):
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# Iterate for definite number of time over a given
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# interval for successful mount
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for i in range(0, 5):
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if os.path.ismount(full_mount_path):
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return True
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time.sleep(2)
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logging.error('Busy wait for mount timed out for mount %s', full_mount_path)
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return False
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def mount(root, drive):
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# FIXME: Possible thundering herd problem here
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el = _get_export_list()
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for export in el:
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if drive == export:
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break
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else:
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logging.error('No export found in %r matching drive, %s', el, drive)
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return False
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# NOTE: root is typically the default value of /mnt/gluster-object
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full_mount_path = os.path.join(root, drive)
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if not os.path.isdir(full_mount_path):
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mkdirs(full_mount_path)
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lck_file = os.path.join(RUN_DIR, '%s.lock' %drive);
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if not os.path.exists(RUN_DIR):
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mkdirs(RUN_DIR)
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fd = os.open(lck_file, os.O_CREAT|os.O_RDWR)
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with os.fdopen(fd, 'r+b') as f:
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try:
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fcntl.lockf(f, fcntl.LOCK_EX|fcntl.LOCK_NB)
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except IOError as ex:
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if ex.errno in (errno.EACCES, errno.EAGAIN):
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# This means that some other process is mounting the
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# filesystem, so wait for the mount process to complete
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return _busy_wait(full_mount_path)
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else:
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raise ex
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mnt_cmd = 'mount -t glusterfs %s:%s %s' % (MOUNT_IP, export, \
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full_mount_path)
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if os.system(mnt_cmd) or not _busy_wait(full_mount_path):
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logging.error('Mount failed %s: %s', NAME, mnt_cmd)
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return False
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return True
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def unmount(full_mount_path):
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# FIXME: Possible thundering herd problem here
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umnt_cmd = 'umount %s 2>> /dev/null' % full_mount_path
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if os.system(umnt_cmd):
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logging.error('Unable to unmount %s %s' % (full_mount_path, NAME))
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def _get_export_list():
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cmnd = 'gluster --remote-host=%s volume info' % MOUNT_IP
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export_list = []
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if os.system(cmnd + ' >> /dev/null'):
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logging.error('Getting volume info failed for %s', NAME)
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else:
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fp = os.popen(cmnd)
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while True:
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item = fp.readline()
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if not item:
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break
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item = item.strip('\n').strip(' ')
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if item.lower().startswith('volume name:'):
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export_list.append(item.split(':')[1].strip(' '))
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return export_list
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def get_mnt_point(vol_name, conf_dir=SWIFT_DIR, conf_file="object-server*"):
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"""Read the object-server's configuration file and return
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the device value"""
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mnt_dir = ''
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conf_files = search_tree(conf_dir, conf_file, '.conf')
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if not conf_files:
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raise Exception("Config file not found")
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_conf = ConfigParser()
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if _conf.read(conf_files[0]):
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try:
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mnt_dir = _conf.get('DEFAULT', 'devices', '')
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except (NoSectionError, NoOptionError):
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raise
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return os.path.join(mnt_dir, vol_name)
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