Function CCH_write_all_shadows

src/jrd/cch.cpp:2424–2545

bool CCH_write_all_shadows(thread_db* tdbb, Shadow* shadow, BufferDesc* bdb, Ods::pag* page,
	FbStatusVector* status, const bool inAst)
{
/**************************************
 *
 *	C C H _ w r i t e _ a l l _ s h a d o w s
 *
 **************************************
 *
 * Functional description
 *	Compute a checksum and write a page out to all shadows
 *	detecting failure on write.
 *	If shadow is null, write to all shadows, otherwise only to specified
 *	shadow.
 *
 **************************************/
	SET_TDBB(tdbb);
	Database* dbb = tdbb->getDatabase();

	Shadow* sdw = shadow ? shadow : dbb->dbb_shadow;

	if (!sdw)
		return true;

	bool result = true;
	Firebird::UCharBuffer spare_buffer;

	if (bdb->bdb_page == HEADER_PAGE_NUMBER)
	{
		Ods::pag* newPage = (pag*) spare_buffer.getBuffer(dbb->dbb_page_size);
		memcpy(newPage, page, HDR_SIZE);
		page = newPage;
		memset((UCHAR*) page + HDR_SIZE, 0, dbb->dbb_page_size - HDR_SIZE);
	}
	page->pag_pageno = bdb->bdb_page.getPageNum();

	for (; sdw; sdw = sdw->sdw_next)
	{
		// don't bother to write to the shadow if it is no longer viable

		/* Fix for bug 7925. drop_gdb fails to remove secondary file if
		   the shadow is conditional. Reason being the header page not
		   being correctly initialized.

		   The following block was not being performed for a conditional
		   shadow since SDW_INVALID expanded to include conditional shadow

		   -Sudesh  07/10/95
		   old code --> if (sdw->sdw_flags & SDW_INVALID)
		 */

		if ((sdw->sdw_flags & SDW_INVALID) && !(sdw->sdw_flags & SDW_conditional))
			continue;

		if (bdb->bdb_page == HEADER_PAGE_NUMBER)
		{
			// fixup header for shadow file
			jrd_file* shadow_file = sdw->sdw_file;