diff options
Diffstat (limited to 'src/backend/storage/file/fd.c')
| -rw-r--r-- | src/backend/storage/file/fd.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/src/backend/storage/file/fd.c b/src/backend/storage/file/fd.c index 9724f481dc0..1e54715056c 100644 --- a/src/backend/storage/file/fd.c +++ b/src/backend/storage/file/fd.c @@ -337,18 +337,22 @@ pg_fdatasync(int fd) * pg_flush_data --- advise OS that the data described won't be needed soon * * Not all platforms have sync_file_range or posix_fadvise; treat as no-op - * if not available. + * if not available. Also, treat as no-op if enableFsync is off; this is + * because the call isn't free, and some platforms such as Linux will actually + * block the requestor until the write is scheduled. */ int pg_flush_data(int fd, off_t offset, off_t amount) { + if (enableFsync) + { #if defined(HAVE_SYNC_FILE_RANGE) - return sync_file_range(fd, offset, amount, SYNC_FILE_RANGE_WRITE); + return sync_file_range(fd, offset, amount, SYNC_FILE_RANGE_WRITE); #elif defined(USE_POSIX_FADVISE) && defined(POSIX_FADV_DONTNEED) - return posix_fadvise(fd, offset, amount, POSIX_FADV_DONTNEED); -#else - return 0; + return posix_fadvise(fd, offset, amount, POSIX_FADV_DONTNEED); #endif + } + return 0; } |