Function PIO_write

src/jrd/os/posix/unix.cpp:793–834

bool PIO_write(thread_db* tdbb, jrd_file* file, BufferDesc* bdb, Ods::pag* page, FbStatusVector* status_vector)
{
/**************************************
 *
 *	P I O _ w r i t e
 *
 **************************************
 *
 * Functional description
 *	Write a data page.  Oh wow.
 *
 **************************************/
	int i;
	SINT64 bytes;
	FB_UINT64 offset;

	if (file->fil_desc == -1)
		return unix_error("write", file, isc_io_write_err, status_vector);

	Database* const dbb = tdbb->getDatabase();

	EngineCheckout cout(tdbb, FB_FUNCTION, EngineCheckout::UNNECESSARY);

	const SLONG size = dbb->dbb_page_size;

	for (i = 0; i < IO_RETRY; i++)
	{
		if (!(file = seek_file(file, bdb, &offset, status_vector)))
			return false;

		if ((bytes = os_utils::pwrite(file->fil_desc, page, size, LSEEK_OFFSET_CAST offset)) == size)
		{
			// os_utils::posix_fadvise(file->desc, offset, size, POSIX_FADV_DONTNEED);
			return true;
		}

		if (bytes < 0 && !SYSCALL_INTERRUPTED(errno))
			return unix_error("write", file, isc_io_write_err, status_vector);
	}

	return unix_error("write_retry", file, isc_io_write_err, status_vector);
}


static jrd_file* seek_file(jrd_file* file, BufferDesc* bdb, FB_UINT64* offset,