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/* batch_fsync.h --- efficiently fsync multiple targets
*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
* ====================================================================
*/
#ifndef SVN_LIBSVN_FS_X__BATCH_FSYNC_H
#define SVN_LIBSVN_FS_X__BATCH_FSYNC_H
#include "svn_error.h"
/* Infrastructure for efficiently calling fsync on files and directories.
*
* The idea is to have a container of open file handles (including
* directory handles on POSIX), at most one per file. During the course
* of an FS operation that needs to be fsync'ed, all touched files and
* folders accumulate in the container.
*
* At the end of the FS operation, all file changes will be written the
* physical disk, once per file and folder. Afterwards, all handles will
* be closed and the container is ready for reuse.
*
* To minimize the delay caused by the batch flush, run all fsync calls
* concurrently - if the OS supports multi-threading.
*/
/* Opaque container type.
*/
typedef struct svn_fs_x__batch_fsync_t svn_fs_x__batch_fsync_t;
/* Initialize the concurrent fsync infrastructure. Clean it up when
* OWNING_POOL gets cleared.
*
* This function must be called before using any of the other functions in
* in this module. It should only be called once.
*/
svn_error_t *
svn_fs_x__batch_fsync_init(apr_pool_t *owning_pool);
/* Set *RESULT_P to a new batch fsync structure, allocated in RESULT_POOL.
* If FLUSH_TO_DISK is not set, the resulting struct will not actually use
* fsync. */
svn_error_t *
svn_fs_x__batch_fsync_create(svn_fs_x__batch_fsync_t **result_p,
svn_boolean_t flush_to_disk,
apr_pool_t *result_pool);
/* Open the file at FILENAME for read and write access. Return it in *FILE
* and schedule it for fsync in BATCH. If BATCH already contains an open
* file for FILENAME, return that instead creating a new instance.
*
* Use SCRATCH_POOL for temporaries. */
svn_error_t *
svn_fs_x__batch_fsync_open_file(apr_file_t **file,
svn_fs_x__batch_fsync_t *batch,
const char *filename,
apr_pool_t *scratch_pool);
/* Inform the BATCH that a file or directory has been created at PATH.
* "Created" means either newly created to renamed to PATH - even if another
* item with the same name existed before. Depending on the OS, the correct
* path will scheduled for fsync.
*
* Use SCRATCH_POOL for temporaries. */
svn_error_t *
svn_fs_x__batch_fsync_new_path(svn_fs_x__batch_fsync_t *batch,
const char *path,
apr_pool_t *scratch_pool);
/* For all files and directories in BATCH, flush all changes to disk and
* close the file handles. Use SCRATCH_POOL for temporaries. */
svn_error_t *
svn_fs_x__batch_fsync_run(svn_fs_x__batch_fsync_t *batch,
apr_pool_t *scratch_pool);
#endif
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