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ce340e530d
The following changes are made to pg_write_zeros(), the API able to write series of zeros using vectored I/O: - Add of an "offset" parameter, to write the size from this position (the 'p' of "pwrite" seems to mean position, though POSIX does not outline ythat directly), hence the name of the routine is incorrect if it is not able to handle offsets. - Avoid memset() of "zbuffer" on every call. - Avoid initialization of the whole IOV array if not needed. - Group the trailing write() call with the main write() call, simplifying the function logic. Author: Andres Freund Reviewed-by: Michael Paquier, Bharath Rupireddy Discussion: https://postgr.es/m/20230215005525.mrrlmqrxzjzhaipl@awork3.anarazel.de
49 lines
1.3 KiB
C
49 lines
1.3 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) 1996-2023, 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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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 fsync_pgdata(const char *pg_data, int serverVersion);
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extern void fsync_dir_recurse(const char *dir);
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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 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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#endif /* FILE_UTILS_H */
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