diff options
author | Peter Portante <peter.portante@redhat.com> | 2013-07-15 16:52:46 -0400 |
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committer | Luis Pabon <lpabon@redhat.com> | 2013-08-21 19:38:35 -0700 |
commit | 9d4e67e741f13b4b93620fbb972886e1dc975fee (patch) | |
tree | b6862ed79251d46771f87bbc25791f8e8d1eb29e /gluster/swift/common/DiskFile.py | |
parent | 54bb5bec7a025eecb51f85274ec37dbd0c478758 (diff) |
Updates to support Havana interim version 1.9.1.
The code changes are basically:
* Apply refactoring in the DiskFile class to use the new DiskWriter
abstraction
* Move and rename our diskfile module to match upstream
* ThreadPools allow us to remove the tpool usage around fsync
* Update the Ring subclass to support the get_part() method
* Update to use the 1.9.1 proxy server unit tests
* Move the DebugLogger class to test.unit
* Rebuild the Rings to use the new layout
* Remove backup ring builder files
* Update spec files to 1.9.1, and tox to use swift 1.9.1
* Updated version to 1.9.0-0
Change-Id: Ica12cac8b351627d67500723f1dbd8a54d45f7c8
Signed-off-by: Peter Portante <peter.portante@redhat.com>
Signed-off-by: Luis Pabon <lpabon@redhat.com>
Reviewed-on: http://review.gluster.org/5331
Diffstat (limited to 'gluster/swift/common/DiskFile.py')
-rw-r--r-- | gluster/swift/common/DiskFile.py | 779 |
1 files changed, 0 insertions, 779 deletions
diff --git a/gluster/swift/common/DiskFile.py b/gluster/swift/common/DiskFile.py deleted file mode 100644 index d64726b..0000000 --- a/gluster/swift/common/DiskFile.py +++ /dev/null @@ -1,779 +0,0 @@ -# Copyright (c) 2012-2013 Red Hat, Inc. -# -# 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. - -import os -import stat -import fcntl -import errno -import random -import logging -from hashlib import md5 -from eventlet import sleep -from contextlib import contextmanager -from swift.common.utils import TRUE_VALUES, fallocate -from swift.common.exceptions import DiskFileNotExist, DiskFileError - -from gluster.swift.common.exceptions import GlusterFileSystemOSError, \ - DiskFileNoSpace -from gluster.swift.common.fs_utils import do_fstat, do_open, do_close, \ - do_unlink, do_chown, os_path, do_fsync, do_fchown, do_stat -from gluster.swift.common.utils import read_metadata, write_metadata, \ - validate_object, create_object_metadata, rmobjdir, dir_is_object, \ - get_object_metadata -from gluster.swift.common.utils import X_CONTENT_LENGTH, X_CONTENT_TYPE, \ - X_TIMESTAMP, X_TYPE, X_OBJECT_TYPE, FILE, OBJECT, DIR_TYPE, \ - FILE_TYPE, DEFAULT_UID, DEFAULT_GID, DIR_NON_OBJECT, DIR_OBJECT -from ConfigParser import ConfigParser, NoSectionError, NoOptionError - -from swift.obj.server import DiskFile - -# FIXME: Hopefully we'll be able to move to Python 2.7+ where O_CLOEXEC will -# be back ported. See http://www.python.org/dev/peps/pep-0433/ -O_CLOEXEC = 02000000 - -DEFAULT_DISK_CHUNK_SIZE = 65536 -# keep these lower-case -DISALLOWED_HEADERS = set('content-length content-type deleted etag'.split()) - - -def _random_sleep(): - sleep(random.uniform(0.5, 0.15)) - - -def _lock_parent(full_path): - parent_path, _ = full_path.rsplit(os.path.sep, 1) - try: - fd = os.open(parent_path, os.O_RDONLY | O_CLOEXEC) - except OSError as err: - if err.errno == errno.ENOENT: - # Cannot lock the parent because it does not exist, let the caller - # handle this situation. - return False - raise - else: - while True: - # Spin sleeping for 1/10th of a second until we get the lock. - # FIXME: Consider adding a final timeout just abort the operation. - try: - fcntl.flock(fd, fcntl.LOCK_EX | fcntl.LOCK_NB) - except IOError as err: - if err.errno == errno.EAGAIN: - _random_sleep() - else: - # Don't leak an open file on an exception - os.close(fd) - raise - except Exception: - # Don't leak an open file for any other exception - os.close(fd) - raise - else: - break - return fd - - -def _make_directory_locked(full_path, uid, gid, metadata=None): - fd = _lock_parent(full_path) - if fd is False: - # Parent does not exist either, pass this situation on to the caller - # to handle. - return False, metadata - try: - # Check for directory existence - stats = do_stat(full_path) - if stats: - # It now exists, having acquired the lock of its parent directory, - # but verify it is actually a directory - is_dir = stat.S_ISDIR(stats.st_mode) - if not is_dir: - # It is not a directory! - raise DiskFileError("_make_directory_locked: non-directory" - " found at path %s when expecting a" - " directory", full_path) - return True, metadata - - # We know the parent directory exists, and we have it locked, attempt - # the creation of the target directory. - return _make_directory_unlocked(full_path, uid, gid, metadata=metadata) - finally: - # We're done here, be sure to remove our lock and close our open FD. - try: - fcntl.flock(fd, fcntl.LOCK_UN) - except: - pass - os.close(fd) - - -def _make_directory_unlocked(full_path, uid, gid, metadata=None): - """ - Make a directory and change the owner ship as specified, and potentially - creating the object metadata if requested. - """ - try: - os.mkdir(full_path) - except OSError as err: - if err.errno == errno.ENOENT: - # Tell the caller some directory of the parent path does not - # exist. - return False, metadata - elif err.errno == errno.EEXIST: - # Possible race, in that the caller invoked this method when it - # had previously determined the file did not exist. - # - # FIXME: When we are confident, remove this stat() call as it is - # not necessary. - try: - stats = os.stat(full_path) - except OSError as serr: - # FIXME: Ideally we'd want to return an appropriate error - # message and code in the PUT Object REST API response. - raise DiskFileError("_make_directory_unlocked: os.mkdir failed" - " because path %s already exists, and" - " a subsequent os.stat on that same" - " path failed (%s)" % (full_path, - str(serr))) - else: - is_dir = stat.S_ISDIR(stats.st_mode) - if not is_dir: - # FIXME: Ideally we'd want to return an appropriate error - # message and code in the PUT Object REST API response. - raise DiskFileError("_make_directory_unlocked: os.mkdir" - " failed on path %s because it already" - " exists but not as a directory" % ( - full_path)) - return True, metadata - elif err.errno == errno.ENOTDIR: - # FIXME: Ideally we'd want to return an appropriate error - # message and code in the PUT Object REST API response. - raise DiskFileError("_make_directory_unlocked: os.mkdir failed" - " because some part of path %s is not in fact" - " a directory" % (full_path)) - elif err.errno == errno.EIO: - # Sometimes Fuse will return an EIO error when it does not know - # how to handle an unexpected, but transient situation. It is - # possible the directory now exists, stat() it to find out after a - # short period of time. - _random_sleep() - try: - stats = os.stat(full_path) - except OSError as serr: - if serr.errno == errno.ENOENT: - errmsg = "_make_directory_unlocked: os.mkdir failed on" \ - " path %s (EIO), and a subsequent os.stat on" \ - " that same path did not find the file." % ( - full_path,) - else: - errmsg = "_make_directory_unlocked: os.mkdir failed on" \ - " path %s (%s), and a subsequent os.stat on" \ - " that same path failed as well (%s)" % ( - full_path, str(err), str(serr)) - raise DiskFileError(errmsg) - else: - # The directory at least exists now - is_dir = stat.S_ISDIR(stats.st_mode) - if is_dir: - # Dump the stats to the log with the original exception. - logging.warn("_make_directory_unlocked: os.mkdir initially" - " failed on path %s (%s) but a stat()" - " following that succeeded: %r" % (full_path, - str(err), - stats)) - # Assume another entity took care of the proper setup. - return True, metadata - else: - raise DiskFileError("_make_directory_unlocked: os.mkdir" - " initially failed on path %s (%s) but" - " now we see that it exists but is not" - " a directory (%r)" % (full_path, - str(err), - stats)) - else: - # Some other potentially rare exception occurred that does not - # currently warrant a special log entry to help diagnose. - raise DiskFileError("_make_directory_unlocked: os.mkdir failed on" - " path %s (%s)" % (full_path, str(err))) - else: - if metadata: - # We were asked to set the initial metadata for this object. - metadata_orig = get_object_metadata(full_path) - metadata_orig.update(metadata) - write_metadata(full_path, metadata_orig) - metadata = metadata_orig - - # We created it, so we are reponsible for always setting the proper - # ownership. - do_chown(full_path, uid, gid) - return True, metadata - - -_fs_conf = ConfigParser() -if _fs_conf.read(os.path.join('/etc/swift', 'fs.conf')): - try: - _mkdir_locking = _fs_conf.get('DEFAULT', 'mkdir_locking', "no") \ - in TRUE_VALUES - except (NoSectionError, NoOptionError): - _mkdir_locking = False - try: - _use_put_mount = _fs_conf.get('DEFAULT', 'use_put_mount', "no") \ - in TRUE_VALUES - except (NoSectionError, NoOptionError): - _use_put_mount = False - try: - _relaxed_writes = _fs_conf.get('DEFAULT', 'relaxed_writes', "no") \ - in TRUE_VALUES - except (NoSectionError, NoOptionError): - _relaxed_writes = False - try: - _preallocate = _fs_conf.get('DEFAULT', 'preallocate', "no") \ - in TRUE_VALUES - except (NoSectionError, NoOptionError): - _preallocate = False -else: - _mkdir_locking = False - _use_put_mount = False - _relaxed_writes = False - _preallocate = False - -if _mkdir_locking: - make_directory = _make_directory_locked -else: - make_directory = _make_directory_unlocked - - -def _adjust_metadata(metadata): - # Fix up the metadata to ensure it has a proper value for the - # Content-Type metadata, as well as an X_TYPE and X_OBJECT_TYPE - # metadata values. - content_type = metadata[X_CONTENT_TYPE] - if not content_type: - # FIXME: How can this be that our caller supplied us with metadata - # that has a content type that evaluates to False? - # - # FIXME: If the file exists, we would already know it is a - # directory. So why are we assuming it is a file object? - metadata[X_CONTENT_TYPE] = FILE_TYPE - metadata[X_OBJECT_TYPE] = FILE - else: - if content_type.lower() == DIR_TYPE: - metadata[X_OBJECT_TYPE] = DIR_OBJECT - else: - metadata[X_OBJECT_TYPE] = FILE - - metadata[X_TYPE] = OBJECT - return metadata - - -class Gluster_DiskFile(DiskFile): - """ - Manage object files on disk. - - Object names ending or beginning with a '/' as in /a, a/, /a/b/, - etc, or object names with multiple consecutive slahes, like a//b, - are not supported. The proxy server's contraints filter - gluster.common.constrains.gluster_check_object_creation() should - reject such requests. - - :param path: path to devices on the node/mount path for UFO. - :param device: device name/account_name for UFO. - :param partition: partition on the device the object lives in - :param account: account name for the object - :param container: container name for the object - :param obj: object name for the object - :param logger: logger object for writing out log file messages - :param keep_data_fp: if True, don't close the fp, otherwise close it - :param disk_chunk_Size: size of chunks on file reads - :param uid: user ID disk object should assume (file or directory) - :param gid: group ID disk object should assume (file or directory) - """ - - def __init__(self, path, device, partition, account, container, obj, - logger, keep_data_fp=False, - disk_chunk_size=DEFAULT_DISK_CHUNK_SIZE, - uid=DEFAULT_UID, gid=DEFAULT_GID, iter_hook=None): - self.disk_chunk_size = disk_chunk_size - self.iter_hook = iter_hook - obj = obj.strip(os.path.sep) - - if os.path.sep in obj: - self._obj_path, self._obj = os.path.split(obj) - else: - self._obj_path = '' - self._obj = obj - - if self._obj_path: - self.name = os.path.join(container, self._obj_path) - else: - self.name = container - # Absolute path for object directory. - self.datadir = os.path.join(path, device, self.name) - self.device_path = os.path.join(path, device) - self._container_path = os.path.join(path, device, container) - if _use_put_mount: - self.put_datadir = os.path.join(self.device_path + '_PUT', - self.name) - else: - self.put_datadir = self.datadir - self._is_dir = False - self.tmppath = None - self.logger = logger - self.metadata = {} - self.meta_file = None - self.fp = None - self.iter_etag = None - self.started_at_0 = False - self.read_to_eof = False - self.quarantined_dir = None - self.keep_cache = False - self.uid = int(uid) - self.gid = int(gid) - self.suppress_file_closing = False - - # Don't store a value for data_file until we know it exists. - self.data_file = None - data_file = os.path.join(self.put_datadir, self._obj) - - try: - stats = do_stat(data_file) - except OSError as err: - if err.errno == errno.ENOTDIR: - return - else: - if not stats: - return - - self.data_file = data_file - self._is_dir = stat.S_ISDIR(stats.st_mode) - - self.metadata = read_metadata(data_file) - if not self.metadata: - create_object_metadata(data_file) - self.metadata = read_metadata(data_file) - - if not validate_object(self.metadata): - create_object_metadata(data_file) - self.metadata = read_metadata(data_file) - - self.filter_metadata() - - if not self._is_dir and keep_data_fp: - # The caller has an assumption that the "fp" field of this - # object is an file object if keep_data_fp is set. However, - # this implementation of the DiskFile object does not need to - # open the file for internal operations. So if the caller - # requests it, we'll just open the file for them. - self.fp = do_open(data_file, 'rb') - - def close(self, verify_file=True): - """ - Close the file. Will handle quarantining file if necessary. - - :param verify_file: Defaults to True. If false, will not check - file to see if it needs quarantining. - """ - # Marker directory - if self._is_dir: - assert not self.fp - return - if self.fp: - do_close(self.fp) - self.fp = None - - def is_deleted(self): - """ - Check if the file is deleted. - - :returns: True if the file doesn't exist or has been flagged as - deleted. - """ - return not self.data_file - - def _create_dir_object(self, dir_path, metadata=None): - """ - Create a directory object at the specified path. No check is made to - see if the directory object already exists, that is left to the - caller (this avoids a potentially duplicate stat() system call). - - The "dir_path" must be relative to its container, self._container_path. - - The "metadata" object is an optional set of metadata to apply to the - newly created directory object. If not present, no initial metadata is - applied. - - The algorithm used is as follows: - - 1. An attempt is made to create the directory, assuming the parent - directory already exists - - * Directory creation races are detected, returning success in - those cases - - 2. If the directory creation fails because some part of the path to - the directory does not exist, then a search back up the path is - performed to find the first existing ancestor directory, and then - the missing parents are successively created, finally creating - the target directory - """ - full_path = os.path.join(self._container_path, dir_path) - cur_path = full_path - stack = [] - while True: - md = None if cur_path != full_path else metadata - ret, newmd = make_directory(cur_path, self.uid, self.gid, md) - if ret: - break - # Some path of the parent did not exist, so loop around and - # create that, pushing this parent on the stack. - if os.path.sep not in cur_path: - raise DiskFileError("DiskFile._create_dir_object(): failed to" - " create directory path while exhausting" - " path elements to create: %s" % full_path) - cur_path, child = cur_path.rsplit(os.path.sep, 1) - assert child - stack.append(child) - - child = stack.pop() if stack else None - while child: - cur_path = os.path.join(cur_path, child) - md = None if cur_path != full_path else metadata - ret, newmd = make_directory(cur_path, self.uid, self.gid, md) - if not ret: - raise DiskFileError("DiskFile._create_dir_object(): failed to" - " create directory path to target, %s," - " on subpath: %s" % (full_path, cur_path)) - child = stack.pop() if stack else None - return True, newmd - - def put_metadata(self, metadata, tombstone=False): - """ - Short hand for putting metadata to .meta and .ts files. - - :param metadata: dictionary of metadata to be written - :param tombstone: whether or not we are writing a tombstone - """ - if tombstone: - # We don't write tombstone files. So do nothing. - return - assert self.data_file is not None, \ - "put_metadata: no file to put metadata into" - metadata = _adjust_metadata(metadata) - write_metadata(self.data_file, metadata) - self.metadata = metadata - self.filter_metadata() - - def put(self, fd, metadata, extension='.data'): - """ - Finalize writing the file on disk, and renames it from the temp file - to the real location. This should be called after the data has been - written to the temp file. - - :param fd: file descriptor of the temp file - :param metadata: dictionary of metadata to be written - :param extension: extension to be used when making the file - """ - # Our caller will use '.data' here; we just ignore it since we map the - # URL directly to the file system. - - metadata = _adjust_metadata(metadata) - - if dir_is_object(metadata): - if not self.data_file: - # Does not exist, create it - data_file = os.path.join(self._obj_path, self._obj) - _, self.metadata = self._create_dir_object(data_file, metadata) - self.data_file = os.path.join(self._container_path, data_file) - elif not self.is_dir: - # Exists, but as a file - raise DiskFileError('DiskFile.put(): directory creation failed' - ' since the target, %s, already exists as' - ' a file' % self.data_file) - return - - if self._is_dir: - # A pre-existing directory already exists on the file - # system, perhaps gratuitously created when another - # object was created, or created externally to Swift - # REST API servicing (UFO use case). - raise DiskFileError('DiskFile.put(): file creation failed since' - ' the target, %s, already exists as a' - ' directory' % self.data_file) - - # Write out metadata before fsync() to ensure it is also forced to - # disk. - write_metadata(fd, metadata) - - if not _relaxed_writes: - do_fsync(fd) - if X_CONTENT_LENGTH in metadata: - # Don't bother doing this before fsync in case the OS gets any - # ideas to issue partial writes. - fsize = int(metadata[X_CONTENT_LENGTH]) - self.drop_cache(fd, 0, fsize) - - # At this point we know that the object's full directory path exists, - # so we can just rename it directly without using Swift's - # swift.common.utils.renamer(), which makes the directory path and - # adds extra stat() calls. - data_file = os.path.join(self.put_datadir, self._obj) - while True: - try: - os.rename(self.tmppath, data_file) - except OSError as err: - if err.errno in (errno.ENOENT, errno.EIO): - # FIXME: Why either of these two error conditions is - # happening is unknown at this point. This might be a FUSE - # issue of some sort or a possible race condition. So - # let's sleep on it, and double check the environment - # after a good nap. - _random_sleep() - # Tease out why this error occurred. The man page for - # rename reads: - # "The link named by tmppath does not exist; or, a - # directory component in data_file does not exist; - # or, tmppath or data_file is an empty string." - assert len(self.tmppath) > 0 and len(data_file) > 0 - tpstats = do_stat(self.tmppath) - tfstats = do_fstat(fd) - assert tfstats - if not tpstats or tfstats.st_ino != tpstats.st_ino: - # Temporary file name conflict - raise DiskFileError('DiskFile.put(): temporary file,' - ' %s, was already renamed' - ' (targeted for %s)' % ( - self.tmppath, data_file)) - else: - # Data file target name now has a bad path! - dfstats = do_stat(self.put_datadir) - if not dfstats: - raise DiskFileError('DiskFile.put(): path to' - ' object, %s, no longer exists' - ' (targeted for %s)' % ( - self.put_datadir, - data_file)) - else: - is_dir = stat.S_ISDIR(dfstats.st_mode) - if not is_dir: - raise DiskFileError('DiskFile.put(): path to' - ' object, %s, no longer a' - ' directory (targeted for' - ' %s)' % (self.put_datadir, - data_file)) - else: - # Let's retry since everything looks okay - logging.warn("DiskFile.put(): os.rename('%s'," - "'%s') initially failed (%s) but" - " a stat('%s') following that" - " succeeded: %r" % ( - self.tmppath, data_file, - str(err), self.put_datadir, - dfstats)) - continue - else: - raise GlusterFileSystemOSError( - err.errno, "%s, os.rename('%s', '%s')" % ( - err.strerror, self.tmppath, data_file)) - else: - # Success! - break - - # Avoid the unlink() system call as part of the mkstemp context cleanup - self.tmppath = None - - self.metadata = metadata - self.filter_metadata() - - # Mark that it actually exists now - self.data_file = os.path.join(self.datadir, self._obj) - - def unlinkold(self, timestamp): - """ - Remove any older versions of the object file. Any file that has an - older timestamp than timestamp will be deleted. - - :param timestamp: timestamp to compare with each file - """ - if not self.metadata or self.metadata[X_TIMESTAMP] >= timestamp: - return - - assert self.data_file, \ - "Have metadata, %r, but no data_file" % self.metadata - - if self._is_dir: - # Marker, or object, directory. - # - # Delete from the filesystem only if it contains - # no objects. If it does contain objects, then just - # remove the object metadata tag which will make this directory a - # fake-filesystem-only directory and will be deleted - # when the container or parent directory is deleted. - metadata = read_metadata(self.data_file) - if dir_is_object(metadata): - metadata[X_OBJECT_TYPE] = DIR_NON_OBJECT - write_metadata(self.data_file, metadata) - rmobjdir(self.data_file) - - else: - # Delete file object - do_unlink(self.data_file) - - # Garbage collection of non-object directories. - # Now that we deleted the file, determine - # if the current directory and any parent - # directory may be deleted. - dirname = os.path.dirname(self.data_file) - while dirname and dirname != self._container_path: - # Try to remove any directories that are not - # objects. - if not rmobjdir(dirname): - # If a directory with objects has been - # found, we can stop garabe collection - break - else: - dirname = os.path.dirname(dirname) - - self.metadata = {} - self.data_file = None - - def get_data_file_size(self): - """ - Returns the os_path.getsize for the file. Raises an exception if this - file does not match the Content-Length stored in the metadata, or if - self.data_file does not exist. - - :returns: file size as an int - :raises DiskFileError: on file size mismatch. - :raises DiskFileNotExist: on file not existing (including deleted) - """ - #Marker directory. - if self._is_dir: - return 0 - try: - file_size = 0 - if self.data_file: - file_size = os_path.getsize(self.data_file) - if X_CONTENT_LENGTH in self.metadata: - metadata_size = int(self.metadata[X_CONTENT_LENGTH]) - if file_size != metadata_size: - self.metadata[X_CONTENT_LENGTH] = file_size - write_metadata(self.data_file, self.metadata) - - return file_size - except OSError as err: - if err.errno != errno.ENOENT: - raise - raise DiskFileNotExist('Data File does not exist.') - - def filter_metadata(self): - if X_TYPE in self.metadata: - self.metadata.pop(X_TYPE) - if X_OBJECT_TYPE in self.metadata: - self.metadata.pop(X_OBJECT_TYPE) - - @contextmanager - def mkstemp(self, size=None): - """ - Contextmanager to make a temporary file, optionally of a specified - initial size. - - For Gluster, we first optimistically create the temporary file using - the "rsync-friendly" .NAME.random naming. If we find that some path to - the file does not exist, we then create that path and then create the - temporary file again. If we get file name conflict, we'll retry using - different random suffixes 1,000 times before giving up. - """ - data_file = os.path.join(self.put_datadir, self._obj) - - # Assume the full directory path exists to the file already, and - # construct the proper name for the temporary file. - for i in range(0, 1000): - tmpfile = '.' + self._obj + '.' + md5(self._obj + - str(random.random())).hexdigest() - tmppath = os.path.join(self.put_datadir, tmpfile) - try: - fd = do_open(tmppath, - os.O_WRONLY | os.O_CREAT | os.O_EXCL | O_CLOEXEC) - except GlusterFileSystemOSError as gerr: - if gerr.errno == errno.ENOSPC: - # Raise DiskFileNoSpace to be handled by upper layers - excp = DiskFileNoSpace() - excp.drive = os.path.basename(self.device_path) - raise excp - if gerr.errno == errno.EEXIST: - # Retry with a different random number. - continue - if gerr.errno == errno.EIO: - # FIXME: Possible FUSE issue or race condition, let's - # sleep on it and retry the operation. - _random_sleep() - logging.warn("DiskFile.mkstemp(): %s ... retrying in" - " 0.1 secs", gerr) - continue - if gerr.errno != errno.ENOENT: - # FIXME: Other cases we should handle? - raise - if not self._obj_path: - # No directory hierarchy and the create failed telling us - # the container or volume directory does not exist. This - # could be a FUSE issue or some race condition, so let's - # sleep a bit and retry. - _random_sleep() - logging.warn("DiskFile.mkstemp(): %s ... retrying in" - " 0.1 secs", gerr) - continue - if i != 0: - # Got ENOENT after previously making the path. This could - # also be a FUSE issue or some race condition, nap and - # retry. - _random_sleep() - logging.warn("DiskFile.mkstemp(): %s ... retrying in" - " 0.1 secs" % gerr) - continue - # It looks like the path to the object does not already exist - self._create_dir_object(self._obj_path) - continue - else: - break - else: - # We failed after 1,000 attempts to create the temporary file. - raise DiskFileError('DiskFile.mkstemp(): failed to successfully' - ' create a temporary file without running' - ' into a name conflict after 1,000 attempts' - ' for: %s' % (data_file,)) - - self.tmppath = tmppath - - try: - # Ensure it is properly owned before we make it available. - do_fchown(fd, self.uid, self.gid) - if _preallocate and size: - # For XFS, fallocate() turns off speculative pre-allocation - # until a write is issued either to the last block of the file - # before the EOF or beyond the EOF. This means that we are - # less likely to fragment free space with pre-allocated - # extents that get truncated back to the known file size. - # However, this call also turns holes into allocated but - # unwritten extents, so that allocation occurs before the - # write, not during XFS writeback. This effectively defeats - # any allocation optimizations the filesystem can make at - # writeback time. - fallocate(fd, size) - yield fd - finally: - try: - do_close(fd) - except OSError: - pass - if self.tmppath: - tmppath, self.tmppath = self.tmppath, None - do_unlink(tmppath) |