mariadb/storage/innobase/include/fut0fut.ic

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Copyright (c) 1995, 2015, Oracle and/or its affiliates. All Rights Reserved.

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/******************************************************************//**
@file include/fut0fut.ic
File-based utilities

Created 12/13/1995 Heikki Tuuri
***********************************************************************/

#include "sync0rw.h"
#include "buf0buf.h"

/** Gets a pointer to a file address and latches the page.
@param[in]	space		space id
@param[in]	page_size	page size
@param[in]	addr		file address
@param[in]	rw_latch	RW_S_LATCH, RW_X_LATCH, RW_SX_LATCH
@param[in,out]	mtr		mini-transaction
@param[out]	ptr_block	file page
@return pointer to a byte in (*ptr_block)->frame; the *ptr_block is
bufferfixed and latched */
UNIV_INLINE
byte*
fut_get_ptr(
	ulint			space,
	const page_size_t&	page_size,
	fil_addr_t		addr,
	rw_lock_type_t		rw_latch,
	mtr_t*			mtr,
	buf_block_t**		ptr_block)
{
	buf_block_t*	block;
	byte*		ptr = NULL;

	ut_ad(addr.boffset < UNIV_PAGE_SIZE);
	ut_ad((rw_latch == RW_S_LATCH)
	      || (rw_latch == RW_X_LATCH)
	      || (rw_latch == RW_SX_LATCH));

	block = buf_page_get(page_id_t(space, addr.page), page_size,
			     rw_latch, mtr);

	ptr = buf_block_get_frame(block) + addr.boffset;

	buf_block_dbg_add_level(block, SYNC_NO_ORDER_CHECK);

	if (ptr_block != NULL) {
		*ptr_block = block;
	}

	return(ptr);
}