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cf131fa942
This new option instructs initdb to skip synchronizing any files in database directories, the database directories themselves, and the tablespace directories, i.e., everything in the base/ subdirectory and any other tablespace directories. Other files, such as those in pg_wal/ and pg_xact/, will still be synchronized unless --no-sync is also specified. --no-sync-data-files is primarily intended for internal use by tools that separately ensure the skipped files are synchronized to disk. A follow-up commit will use this to help optimize pg_upgrade's file transfer step. The --sync-method=fsync implementation of this option makes use of a new exclude_dir parameter for walkdir(). When not NULL, exclude_dir specifies a directory to skip processing. The --sync-method=syncfs implementation of this option just skips synchronizing the non-default tablespace directories. This means that initdb will still synchronize some or all of the database files, but there's not much we can do about that. Discussion: https://postgr.es/m/Zyvop-LxLXBLrZil%40nathan
66 lines
1.8 KiB
C
66 lines
1.8 KiB
C
/*-------------------------------------------------------------------------
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*
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* Assorted utility functions to work on files.
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*
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*
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* Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/common/file_utils.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef FILE_UTILS_H
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#define FILE_UTILS_H
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#include <dirent.h>
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typedef enum PGFileType
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{
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PGFILETYPE_ERROR,
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PGFILETYPE_UNKNOWN,
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PGFILETYPE_REG,
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PGFILETYPE_DIR,
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PGFILETYPE_LNK,
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} PGFileType;
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typedef enum DataDirSyncMethod
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{
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DATA_DIR_SYNC_METHOD_FSYNC,
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DATA_DIR_SYNC_METHOD_SYNCFS,
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} DataDirSyncMethod;
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struct iovec; /* avoid including port/pg_iovec.h here */
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#ifdef FRONTEND
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extern int fsync_fname(const char *fname, bool isdir);
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extern void sync_pgdata(const char *pg_data, int serverVersion,
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DataDirSyncMethod sync_method, bool sync_data_files);
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extern void sync_dir_recurse(const char *dir, DataDirSyncMethod sync_method);
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extern int durable_rename(const char *oldfile, const char *newfile);
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extern int fsync_parent_path(const char *fname);
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#endif
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extern PGFileType get_dirent_type(const char *path,
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const struct dirent *de,
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bool look_through_symlinks,
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int elevel);
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extern int compute_remaining_iovec(struct iovec *destination,
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const struct iovec *source,
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int iovcnt,
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size_t transferred);
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extern ssize_t pg_pwritev_with_retry(int fd,
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const struct iovec *iov,
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int iovcnt,
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off_t offset);
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extern ssize_t pg_pwrite_zeros(int fd, size_t size, off_t offset);
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/* Filename components */
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#define PG_TEMP_FILES_DIR "pgsql_tmp"
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#define PG_TEMP_FILE_PREFIX "pgsql_tmp"
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#endif /* FILE_UTILS_H */
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