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| author | Michael Paquier <michael@paquier.xyz> | 2022-11-08 12:23:46 +0900 |
|---|---|---|
| committer | Michael Paquier <michael@paquier.xyz> | 2022-11-08 12:23:46 +0900 |
| commit | 3bdbdf5d06f2179d4c17926d77ff734ea9e7d525 (patch) | |
| tree | 2e541ce34d6b56af7d9db393424f36ea2cffa48d /src/include/common/file_utils.h | |
| parent | d7744d50a5394db8d973d1cfa034ed6640aec13c (diff) | |
| download | postgresql-3bdbdf5d06f2179d4c17926d77ff734ea9e7d525.tar.gz postgresql-3bdbdf5d06f2179d4c17926d77ff734ea9e7d525.zip | |
Introduce pg_pwrite_zeros() in fileutils.c
This routine is designed to write zeros to a file using vectored I/O,
for a size given by its caller, being useful when it comes to
initializing a file with a final size already known.
XLogFileInitInternal() in xlog.c is changed to use this new routine when
initializing WAL segments with zeros (wal_init_zero enabled). Note that
the aligned buffers used for the vectored I/O writes have a size of
XLOG_BLCKSZ, and not BLCKSZ anymore, as pg_pwrite_zeros() relies on
PGAlignedBlock while xlog.c originally used PGAlignedXLogBlock.
This routine will be used in a follow-up patch to do the pre-padding of
WAL segments for pg_receivewal and pg_basebackup when these are not
compressed.
Author: Bharath Rupireddy
Reviewed-by: Nathan Bossart, Andres Freund, Thomas Munro, Michael
Paquier
Discussion: https://www.postgresql.org/message-id/CALj2ACUq7nAb7%3DbJNbK3yYmp-SZhJcXFR_pLk8un6XgDzDF3OA%40mail.gmail.com
Diffstat (limited to 'src/include/common/file_utils.h')
| -rw-r--r-- | src/include/common/file_utils.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/include/common/file_utils.h b/src/include/common/file_utils.h index 2c5dbcb0b1e..d2c64c2196c 100644 --- a/src/include/common/file_utils.h +++ b/src/include/common/file_utils.h @@ -44,4 +44,6 @@ extern ssize_t pg_pwritev_with_retry(int fd, int iovcnt, off_t offset); +extern ssize_t pg_pwrite_zeros(int fd, size_t size); + #endif /* FILE_UTILS_H */ |