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f619d79bda
btr_free_if_exists(): Always use the BUF_GET_POSSIBLY_FREED mode when accessing pages, because due to MDEV-24589 the function fil_space_t::set_stopping(true) can be called at any time during the execution of this function. mtr_t::m_freeing_tree: New data member for debugging purposes. buf_page_get_low(): Assert that the BUF_GET mode is not being used anywhere during the execution of btr_free_if_exists(). In all code related to freeing or allocating pages, we will add some robustness, by making more use of BUF_GET_POSSIBLY_FREED and by reporting an error instead of crashing in some cases of corruption.
77 lines
2.3 KiB
C
77 lines
2.3 KiB
C
/*****************************************************************************
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Copyright (c) 1995, 2016, Oracle and/or its affiliates. All Rights Reserved.
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Copyright (c) 2019, 2021, MariaDB Corporation.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
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*****************************************************************************/
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/******************************************************************//**
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@file include/fut0fut.h
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File-based utilities
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Created 12/13/1995 Heikki Tuuri
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***********************************************************************/
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#ifndef fut0fut_h
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#define fut0fut_h
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#include "mtr0mtr.h"
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/** Gets a pointer to a file address and latches the page.
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@param[in] space space id
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@param[in] zip_size ROW_FORMAT=COMPRESSED page size, or 0
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@param[in] addr file address
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@param[in] rw_latch RW_S_LATCH, RW_X_LATCH, RW_SX_LATCH
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@param[out] ptr_block file page
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@param[in,out] mtr mini-transaction
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@return pointer to a byte in (*ptr_block)->frame; the *ptr_block is
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bufferfixed and latched */
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inline
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byte*
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fut_get_ptr(
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ulint space,
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ulint zip_size,
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fil_addr_t addr,
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rw_lock_type_t rw_latch,
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mtr_t* mtr,
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buf_block_t** ptr_block = NULL)
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{
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buf_block_t* block;
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byte* ptr = NULL;
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ut_ad(addr.boffset < srv_page_size);
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ut_ad((rw_latch == RW_S_LATCH)
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|| (rw_latch == RW_X_LATCH)
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|| (rw_latch == RW_SX_LATCH));
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block = buf_page_get_gen(page_id_t(space, addr.page), zip_size,
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rw_latch, nullptr, BUF_GET_POSSIBLY_FREED,
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mtr);
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if (!block) {
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} else if (block->page.status == buf_page_t::FREED) {
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block = nullptr;
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} else {
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ptr = buf_block_get_frame(block) + addr.boffset;
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}
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if (ptr_block != NULL) {
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*ptr_block = block;
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}
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return(ptr);
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}
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#endif /* fut0fut_h */
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