/***************************************************************************** Copyright (c) 1995, 2009, Innobase Oy. All Rights Reserved. Copyright (c) 2008, Google Inc. Portions of this file contain modifications contributed and copyrighted by Google, Inc. Those modifications are gratefully acknowledged and are described briefly in the InnoDB documentation. The contributions by Google are incorporated with their permission, and subject to the conditions contained in the file COPYING.Google. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA *****************************************************************************/ /**************************************************//** @file include/buf0buf.ic The database buffer buf_pool Created 11/5/1995 Heikki Tuuri *******************************************************/ #include "mtr0mtr.h" #ifndef UNIV_HOTBACKUP #include "buf0flu.h" #include "buf0lru.h" #include "buf0rea.h" /********************************************************************//** Reads the freed_page_clock of a buffer block. @return freed_page_clock */ UNIV_INLINE ulint buf_page_get_freed_page_clock( /*==========================*/ const buf_page_t* bpage) /*!< in: block */ { /* This is sometimes read without holding buf_pool_mutex. */ return(bpage->freed_page_clock); } /********************************************************************//** Reads the freed_page_clock of a buffer block. @return freed_page_clock */ UNIV_INLINE ulint buf_block_get_freed_page_clock( /*===========================*/ const buf_block_t* block) /*!< in: block */ { return(buf_page_get_freed_page_clock(&block->page)); } /********************************************************************//** Recommends a move of a block to the start of the LRU list if there is danger of dropping from the buffer pool. NOTE: does not reserve the buffer pool mutex. @return TRUE if should be made younger */ UNIV_INLINE ibool buf_page_peek_if_too_old( /*=====================*/ const buf_page_t* bpage) /*!< in: block to make younger */ { return(buf_pool->freed_page_clock >= buf_page_get_freed_page_clock(bpage) + 1 + (buf_pool->curr_size / 4)); } /*********************************************************************//** Gets the current size of buffer buf_pool in bytes. @return size in bytes */ UNIV_INLINE ulint buf_pool_get_curr_size(void) /*========================*/ { return(buf_pool->curr_size * UNIV_PAGE_SIZE); } /********************************************************************//** Gets the smallest oldest_modification lsn for any page in the pool. Returns zero if all modified pages have been flushed to disk. @return oldest modification in pool, zero if none */ UNIV_INLINE ib_uint64_t buf_pool_get_oldest_modification(void) /*==================================*/ { buf_page_t* bpage; ib_uint64_t lsn; try_again: //buf_pool_mutex_enter(); mutex_enter(&flush_list_mutex); bpage = UT_LIST_GET_LAST(buf_pool->flush_list); if (bpage == NULL) { lsn = 0; } else { ut_ad(bpage->in_flush_list); lsn = bpage->oldest_modification; if (lsn == 0) { mutex_exit(&flush_list_mutex); goto try_again; } } //buf_pool_mutex_exit(); mutex_exit(&flush_list_mutex); /* The returned answer may be out of date: the flush_list can change after the mutex has been released. */ return(lsn); } /*******************************************************************//** Increments the buf_pool clock by one and returns its new value. Remember that in the 32 bit version the clock wraps around at 4 billion! @return new clock value */ UNIV_INLINE ulint buf_pool_clock_tic(void) /*====================*/ { //ut_ad(buf_pool_mutex_own()); ut_ad(mutex_own(&LRU_list_mutex)); buf_pool->ulint_clock++; return(buf_pool->ulint_clock); } #endif /* !UNIV_HOTBACKUP */ /*********************************************************************//** Gets the state of a block. @return state */ UNIV_INLINE enum buf_page_state buf_page_get_state( /*===============*/ const buf_page_t* bpage) /*!< in: pointer to the control block */ { enum buf_page_state state = (enum buf_page_state) bpage->state; #ifdef UNIV_DEBUG switch (state) { case BUF_BLOCK_ZIP_FREE: case BUF_BLOCK_ZIP_PAGE: case BUF_BLOCK_ZIP_DIRTY: case BUF_BLOCK_NOT_USED: case BUF_BLOCK_READY_FOR_USE: case BUF_BLOCK_FILE_PAGE: case BUF_BLOCK_MEMORY: case BUF_BLOCK_REMOVE_HASH: break; default: ut_error; } #endif /* UNIV_DEBUG */ return(state); } /*********************************************************************//** Gets the state of a block. @return state */ UNIV_INLINE enum buf_page_state buf_block_get_state( /*================*/ const buf_block_t* block) /*!< in: pointer to the control block */ { return(buf_page_get_state(&block->page)); } /*********************************************************************//** Sets the state of a block. */ UNIV_INLINE void buf_page_set_state( /*===============*/ buf_page_t* bpage, /*!< in/out: pointer to control block */ enum buf_page_state state) /*!< in: state */ { #ifdef UNIV_DEBUG enum buf_page_state old_state = buf_page_get_state(bpage); switch (old_state) { case BUF_BLOCK_ZIP_FREE: ut_error; break; case BUF_BLOCK_ZIP_PAGE: ut_a(state == BUF_BLOCK_ZIP_DIRTY); break; case BUF_BLOCK_ZIP_DIRTY: ut_a(state == BUF_BLOCK_ZIP_PAGE); break; case BUF_BLOCK_NOT_USED: ut_a(state == BUF_BLOCK_READY_FOR_USE); break; case BUF_BLOCK_READY_FOR_USE: ut_a(state == BUF_BLOCK_MEMORY || state == BUF_BLOCK_FILE_PAGE || state == BUF_BLOCK_NOT_USED); break; case BUF_BLOCK_MEMORY: ut_a(state == BUF_BLOCK_NOT_USED); break; case BUF_BLOCK_FILE_PAGE: ut_a(state == BUF_BLOCK_NOT_USED || state == BUF_BLOCK_REMOVE_HASH); break; case BUF_BLOCK_REMOVE_HASH: ut_a(state == BUF_BLOCK_MEMORY); break; } #endif /* UNIV_DEBUG */ bpage->state = state; ut_ad(buf_page_get_state(bpage) == state); } /*********************************************************************//** Sets the state of a block. */ UNIV_INLINE void buf_block_set_state( /*================*/ buf_block_t* block, /*!< in/out: pointer to control block */ enum buf_page_state state) /*!< in: state */ { buf_page_set_state(&block->page, state); } /*********************************************************************//** Determines if a block is mapped to a tablespace. @return TRUE if mapped */ UNIV_INLINE ibool buf_page_in_file( /*=============*/ const buf_page_t* bpage) /*!< in: pointer to control block */ { switch (buf_page_get_state(bpage)) { case BUF_BLOCK_ZIP_FREE: /* This is a free page in buf_pool->zip_free[]. Such pages should only be accessed by the buddy allocator. */ /* ut_error; */ /* optimistic */ break; case BUF_BLOCK_ZIP_PAGE: case BUF_BLOCK_ZIP_DIRTY: case BUF_BLOCK_FILE_PAGE: return(TRUE); case BUF_BLOCK_NOT_USED: case BUF_BLOCK_READY_FOR_USE: case BUF_BLOCK_MEMORY: case BUF_BLOCK_REMOVE_HASH: break; } return(FALSE); } #ifndef UNIV_HOTBACKUP /*********************************************************************//** Determines if a block should be on unzip_LRU list. @return TRUE if block belongs to unzip_LRU */ UNIV_INLINE ibool buf_page_belongs_to_unzip_LRU( /*==========================*/ const buf_page_t* bpage) /*!< in: pointer to control block */ { ut_ad(buf_page_in_file(bpage)); return(bpage->zip.data && buf_page_get_state(bpage) == BUF_BLOCK_FILE_PAGE); } /*********************************************************************//** Determine the approximate LRU list position of a block. @return LRU list position */ UNIV_INLINE ulint buf_page_get_LRU_position( /*======================*/ const buf_page_t* bpage) /*!< in: control block */ { ut_ad(buf_page_in_file(bpage)); //ut_ad(buf_pool_mutex_own()); /* This is used in optimistic */ return(bpage->LRU_position); } /*********************************************************************//** Gets the mutex of a block. @return pointer to mutex protecting bpage */ UNIV_INLINE mutex_t* buf_page_get_mutex( /*===============*/ const buf_page_t* bpage) /*!< in: pointer to control block */ { switch (buf_page_get_state(bpage)) { case BUF_BLOCK_ZIP_FREE: /* ut_error; */ /* optimistic */ return(NULL); case BUF_BLOCK_ZIP_PAGE: case BUF_BLOCK_ZIP_DIRTY: return(&buf_pool_zip_mutex); default: return(&((buf_block_t*) bpage)->mutex); } } /************************************************************************* Gets the mutex of a block and enter the mutex with consistency. */ UNIV_INLINE mutex_t* buf_page_get_mutex_enter( /*=========================*/ const buf_page_t* bpage) /*!< in: pointer to control block */ { mutex_t* block_mutex; while(1) { block_mutex = buf_page_get_mutex(bpage); if (!block_mutex) return block_mutex; mutex_enter(block_mutex); if (block_mutex == buf_page_get_mutex(bpage)) return block_mutex; mutex_exit(block_mutex); } } /*********************************************************************//** Get the flush type of a page. @return flush type */ UNIV_INLINE enum buf_flush buf_page_get_flush_type( /*====================*/ const buf_page_t* bpage) /*!< in: buffer page */ { enum buf_flush flush_type = (enum buf_flush) bpage->flush_type; #ifdef UNIV_DEBUG switch (flush_type) { case BUF_FLUSH_LRU: case BUF_FLUSH_SINGLE_PAGE: case BUF_FLUSH_LIST: return(flush_type); case BUF_FLUSH_N_TYPES: break; } ut_error; #endif /* UNIV_DEBUG */ return(flush_type); } /*********************************************************************//** Set the flush type of a page. */ UNIV_INLINE void buf_page_set_flush_type( /*====================*/ buf_page_t* bpage, /*!< in: buffer page */ enum buf_flush flush_type) /*!< in: flush type */ { bpage->flush_type = flush_type; ut_ad(buf_page_get_flush_type(bpage) == flush_type); } /*********************************************************************//** Map a block to a file page. */ UNIV_INLINE void buf_block_set_file_page( /*====================*/ buf_block_t* block, /*!< in/out: pointer to control block */ ulint space, /*!< in: tablespace id */ ulint page_no)/*!< in: page number */ { buf_block_set_state(block, BUF_BLOCK_FILE_PAGE); block->page.space = space; block->page.offset = page_no; } /*********************************************************************//** Gets the io_fix state of a block. @return io_fix state */ UNIV_INLINE enum buf_io_fix buf_page_get_io_fix( /*================*/ const buf_page_t* bpage) /*!< in: pointer to the control block */ { enum buf_io_fix io_fix = (enum buf_io_fix) bpage->io_fix; #ifdef UNIV_DEBUG switch (io_fix) { case BUF_IO_NONE: case BUF_IO_READ: case BUF_IO_WRITE: return(io_fix); } ut_error; #endif /* UNIV_DEBUG */ return(io_fix); } /*********************************************************************//** Gets the io_fix state of a block. @return io_fix state */ UNIV_INLINE enum buf_io_fix buf_block_get_io_fix( /*================*/ const buf_block_t* block) /*!< in: pointer to the control block */ { return(buf_page_get_io_fix(&block->page)); } /*********************************************************************//** Sets the io_fix state of a block. */ UNIV_INLINE void buf_page_set_io_fix( /*================*/ buf_page_t* bpage, /*!< in/out: control block */ enum buf_io_fix io_fix) /*!< in: io_fix state */ { //ut_ad(buf_pool_mutex_own()); ut_ad(mutex_own(buf_page_get_mutex(bpage))); bpage->io_fix = io_fix; ut_ad(buf_page_get_io_fix(bpage) == io_fix); } /*********************************************************************//** Sets the io_fix state of a block. */ UNIV_INLINE void buf_block_set_io_fix( /*=================*/ buf_block_t* block, /*!< in/out: control block */ enum buf_io_fix io_fix) /*!< in: io_fix state */ { buf_page_set_io_fix(&block->page, io_fix); } /********************************************************************//** Determine if a buffer block can be relocated in memory. The block can be dirty, but it must not be I/O-fixed or bufferfixed. */ UNIV_INLINE ibool buf_page_can_relocate( /*==================*/ const buf_page_t* bpage) /*!< control block being relocated */ { //ut_ad(buf_pool_mutex_own()); ut_ad(mutex_own(buf_page_get_mutex(bpage))); ut_ad(buf_page_in_file(bpage)); /* optimistic */ //ut_ad(bpage->in_LRU_list); return(bpage->in_LRU_list && bpage->io_fix == BUF_IO_NONE && bpage->buf_fix_count == 0); } /*********************************************************************//** Determine if a block has been flagged old. @return TRUE if old */ UNIV_INLINE ibool buf_page_is_old( /*============*/ const buf_page_t* bpage) /*!< in: control block */ { ut_ad(buf_page_in_file(bpage)); //ut_ad(buf_pool_mutex_own()); /* This is used in optimistic */ return(bpage->old); } /*********************************************************************//** Flag a block old. */ UNIV_INLINE void buf_page_set_old( /*=============*/ buf_page_t* bpage, /*!< in/out: control block */ ibool old) /*!< in: old */ { ut_a(buf_page_in_file(bpage)); //ut_ad(buf_pool_mutex_own()); ut_ad(mutex_own(&LRU_list_mutex)); ut_ad(bpage->in_LRU_list); #ifdef UNIV_LRU_DEBUG if (UT_LIST_GET_PREV(LRU, bpage) && UT_LIST_GET_NEXT(LRU, bpage) && UT_LIST_GET_PREV(LRU, bpage)->old == UT_LIST_GET_NEXT(LRU, bpage)->old) { ut_a(UT_LIST_GET_PREV(LRU, bpage)->old == old); } #endif /* UNIV_LRU_DEBUG */ bpage->old = old; } /*********************************************************************//** Determine if a block has been accessed in the buffer pool. @return TRUE if accessed */ UNIV_INLINE ibool buf_page_is_accessed( /*=================*/ const buf_page_t* bpage) /*!< in: control block */ { ut_ad(buf_page_in_file(bpage)); return(bpage->accessed); } /*********************************************************************//** Flag a block accessed. */ UNIV_INLINE void buf_page_set_accessed( /*==================*/ buf_page_t* bpage, /*!< in/out: control block */ ibool accessed) /*!< in: accessed */ { ut_a(buf_page_in_file(bpage)); ut_ad(mutex_own(buf_page_get_mutex(bpage))); bpage->accessed = accessed; } /*********************************************************************//** Gets the buf_block_t handle of a buffered file block if an uncompressed page frame exists, or NULL. @return control block, or NULL */ UNIV_INLINE buf_block_t* buf_page_get_block( /*===============*/ buf_page_t* bpage) /*!< in: control block, or NULL */ { if (UNIV_LIKELY(bpage != NULL)) { ut_ad(buf_page_in_file(bpage)); if (buf_page_get_state(bpage) == BUF_BLOCK_FILE_PAGE) { return((buf_block_t*) bpage); } } return(NULL); } #endif /* !UNIV_HOTBACKUP */ #ifdef UNIV_DEBUG /*********************************************************************//** Gets a pointer to the memory frame of a block. @return pointer to the frame */ UNIV_INLINE buf_frame_t* buf_block_get_frame( /*================*/ const buf_block_t* block) /*!< in: pointer to the control block */ { ut_ad(block); switch (buf_block_get_state(block)) { case BUF_BLOCK_ZIP_FREE: case BUF_BLOCK_ZIP_PAGE: case BUF_BLOCK_ZIP_DIRTY: case BUF_BLOCK_NOT_USED: ut_error; break; case BUF_BLOCK_FILE_PAGE: # ifndef UNIV_HOTBACKUP ut_a(block->page.buf_fix_count > 0); # endif /* !UNIV_HOTBACKUP */ /* fall through */ case BUF_BLOCK_READY_FOR_USE: case BUF_BLOCK_MEMORY: case BUF_BLOCK_REMOVE_HASH: goto ok; } ut_error; ok: return((buf_frame_t*) block->frame); } #endif /* UNIV_DEBUG */ /*********************************************************************//** Gets the space id of a block. @return space id */ UNIV_INLINE ulint buf_page_get_space( /*===============*/ const buf_page_t* bpage) /*!< in: pointer to the control block */ { ut_ad(bpage); ut_a(buf_page_in_file(bpage)); return(bpage->space); } /*********************************************************************//** Gets the space id of a block. @return space id */ UNIV_INLINE ulint buf_block_get_space( /*================*/ const buf_block_t* block) /*!< in: pointer to the control block */ { ut_ad(block); ut_a(buf_block_get_state(block) == BUF_BLOCK_FILE_PAGE); return(block->page.space); } /*********************************************************************//** Gets the page number of a block. @return page number */ UNIV_INLINE ulint buf_page_get_page_no( /*=================*/ const buf_page_t* bpage) /*!< in: pointer to the control block */ { ut_ad(bpage); ut_a(buf_page_in_file(bpage)); return(bpage->offset); } /*********************************************************************//** Gets the page number of a block. @return page number */ UNIV_INLINE ulint buf_block_get_page_no( /*==================*/ const buf_block_t* block) /*!< in: pointer to the control block */ { ut_ad(block); ut_a(buf_block_get_state(block) == BUF_BLOCK_FILE_PAGE); return(block->page.offset); } /*********************************************************************//** Gets the compressed page size of a block. @return compressed page size, or 0 */ UNIV_INLINE ulint buf_page_get_zip_size( /*==================*/ const buf_page_t* bpage) /*!< in: pointer to the control block */ { return(bpage->zip.ssize ? 512 << bpage->zip.ssize : 0); } /*********************************************************************//** Gets the compressed page size of a block. @return compressed page size, or 0 */ UNIV_INLINE ulint buf_block_get_zip_size( /*===================*/ const buf_block_t* block) /*!< in: pointer to the control block */ { return(block->page.zip.ssize ? 512 << block->page.zip.ssize : 0); } #ifndef UNIV_HOTBACKUP #if defined UNIV_DEBUG || defined UNIV_ZIP_DEBUG /*********************************************************************//** Gets the compressed page descriptor corresponding to an uncompressed page if applicable. @return compressed page descriptor, or NULL */ UNIV_INLINE const page_zip_des_t* buf_frame_get_page_zip( /*===================*/ const byte* ptr) /*!< in: pointer to the page */ { return(buf_block_get_page_zip(buf_block_align(ptr))); } #endif /* UNIV_DEBUG || UNIV_ZIP_DEBUG */ #endif /* !UNIV_HOTBACKUP */ /**********************************************************************//** Gets the space id, page offset, and byte offset within page of a pointer pointing to a buffer frame containing a file page. */ UNIV_INLINE void buf_ptr_get_fsp_addr( /*=================*/ const void* ptr, /*!< in: pointer to a buffer frame */ ulint* space, /*!< out: space id */ fil_addr_t* addr) /*!< out: page offset and byte offset */ { const page_t* page = (const page_t*) ut_align_down(ptr, UNIV_PAGE_SIZE); *space = mach_read_from_4(page + FIL_PAGE_ARCH_LOG_NO_OR_SPACE_ID); addr->page = mach_read_from_4(page + FIL_PAGE_OFFSET); addr->boffset = ut_align_offset(ptr, UNIV_PAGE_SIZE); } #ifndef UNIV_HOTBACKUP /**********************************************************************//** Gets the hash value of the page the pointer is pointing to. This can be used in searches in the lock hash table. @return lock hash value */ UNIV_INLINE ulint buf_block_get_lock_hash_val( /*========================*/ const buf_block_t* block) /*!< in: block */ { return(block->lock_hash_val); } /********************************************************************//** Allocates a buffer block. @return own: the allocated block, in state BUF_BLOCK_MEMORY */ UNIV_INLINE buf_block_t* buf_block_alloc( /*============*/ ulint zip_size) /*!< in: compressed page size in bytes, or 0 if uncompressed tablespace */ { buf_block_t* block; block = buf_LRU_get_free_block(zip_size); buf_block_set_state(block, BUF_BLOCK_MEMORY); return(block); } /********************************************************************//** Frees a buffer block which does not contain a file page. */ UNIV_INLINE void buf_block_free( /*===========*/ buf_block_t* block) /*!< in, own: block to be freed */ { //buf_pool_mutex_enter(); mutex_enter(&block->mutex); ut_a(buf_block_get_state(block) != BUF_BLOCK_FILE_PAGE); buf_LRU_block_free_non_file_page(block, FALSE); mutex_exit(&block->mutex); //buf_pool_mutex_exit(); } #endif /* !UNIV_HOTBACKUP */ /*********************************************************************//** Copies contents of a buffer frame to a given buffer. @return buf */ UNIV_INLINE byte* buf_frame_copy( /*===========*/ byte* buf, /*!< in: buffer to copy to */ const buf_frame_t* frame) /*!< in: buffer frame */ { ut_ad(buf && frame); ut_memcpy(buf, frame, UNIV_PAGE_SIZE); return(buf); } #ifndef UNIV_HOTBACKUP /********************************************************************//** Calculates a folded value of a file page address to use in the page hash table. @return the folded value */ UNIV_INLINE ulint buf_page_address_fold( /*==================*/ ulint space, /*!< in: space id */ ulint offset) /*!< in: offset of the page within space */ { return((space << 20) + space + offset); } /********************************************************************//** Gets the youngest modification log sequence number for a frame. Returns zero if not file page or no modification occurred yet. @return newest modification to page */ UNIV_INLINE ib_uint64_t buf_page_get_newest_modification( /*=============================*/ const buf_page_t* bpage) /*!< in: block containing the page frame */ { ib_uint64_t lsn; mutex_t* block_mutex = buf_page_get_mutex_enter(bpage); ut_a(block_mutex); if (buf_page_in_file(bpage)) { lsn = bpage->newest_modification; } else { lsn = 0; } mutex_exit(block_mutex); return(lsn); } /********************************************************************//** Increments the modify clock of a frame by 1. The caller must (1) own the buf_pool mutex and block bufferfix count has to be zero, (2) or own an x-lock on the block. */ UNIV_INLINE void buf_block_modify_clock_inc( /*=======================*/ buf_block_t* block) /*!< in: block */ { #ifdef UNIV_SYNC_DEBUG ut_ad((mutex_own(&LRU_list_mutex) && (block->page.buf_fix_count == 0)) || rw_lock_own(&(block->lock), RW_LOCK_EXCLUSIVE)); #endif /* UNIV_SYNC_DEBUG */ block->modify_clock++; } /********************************************************************//** Returns the value of the modify clock. The caller must have an s-lock or x-lock on the block. @return value */ UNIV_INLINE ib_uint64_t buf_block_get_modify_clock( /*=======================*/ buf_block_t* block) /*!< in: block */ { #ifdef UNIV_SYNC_DEBUG ut_ad(rw_lock_own(&(block->lock), RW_LOCK_SHARED) || rw_lock_own(&(block->lock), RW_LOCK_EXCLUSIVE)); #endif /* UNIV_SYNC_DEBUG */ return(block->modify_clock); } /*******************************************************************//** Increments the bufferfix count. */ UNIV_INLINE void buf_block_buf_fix_inc_func( /*=======================*/ #ifdef UNIV_SYNC_DEBUG const char* file, /*!< in: file name */ ulint line, /*!< in: line */ #endif /* UNIV_SYNC_DEBUG */ buf_block_t* block) /*!< in/out: block to bufferfix */ { #ifdef UNIV_SYNC_DEBUG ibool ret; ret = rw_lock_s_lock_nowait(&(block->debug_latch), file, line); ut_a(ret); #endif /* UNIV_SYNC_DEBUG */ ut_ad(mutex_own(&block->mutex)); block->page.buf_fix_count++; } #ifdef UNIV_SYNC_DEBUG /** Increments the bufferfix count. @param b in/out: block to bufferfix @param f in: file name where requested @param l in: line number where requested */ # define buf_block_buf_fix_inc(b,f,l) buf_block_buf_fix_inc_func(f,l,b) #else /* UNIV_SYNC_DEBUG */ /** Increments the bufferfix count. @param b in/out: block to bufferfix @param f in: file name where requested @param l in: line number where requested */ # define buf_block_buf_fix_inc(b,f,l) buf_block_buf_fix_inc_func(b) #endif /* UNIV_SYNC_DEBUG */ /*******************************************************************//** Decrements the bufferfix count. */ UNIV_INLINE void buf_block_buf_fix_dec( /*==================*/ buf_block_t* block) /*!< in/out: block to bufferunfix */ { ut_ad(mutex_own(&block->mutex)); block->page.buf_fix_count--; #ifdef UNIV_SYNC_DEBUG rw_lock_s_unlock(&block->debug_latch); #endif } /******************************************************************//** Returns the control block of a file page, NULL if not found. @return block, NULL if not found */ UNIV_INLINE buf_page_t* buf_page_hash_get( /*==============*/ ulint space, /*!< in: space id */ ulint offset) /*!< in: offset of the page within space */ { buf_page_t* bpage; ulint fold; ut_ad(buf_pool); //ut_ad(buf_pool_mutex_own()); #ifdef UNIV_SYNC_DEBUG ut_ad(rw_lock_own(&page_hash_latch, RW_LOCK_EX) || rw_lock_own(&page_hash_latch, RW_LOCK_SHARED)); #endif /* Look for the page in the hash table */ fold = buf_page_address_fold(space, offset); HASH_SEARCH(hash, buf_pool->page_hash, fold, buf_page_t*, bpage, ut_ad(bpage->in_page_hash && !bpage->in_zip_hash && buf_page_in_file(bpage)), bpage->space == space && bpage->offset == offset); if (bpage) { ut_a(buf_page_in_file(bpage)); ut_ad(bpage->in_page_hash); ut_ad(!bpage->in_zip_hash); UNIV_MEM_ASSERT_RW(bpage, sizeof *bpage); } return(bpage); } /******************************************************************//** Returns the control block of a file page, NULL if not found or an uncompressed page frame does not exist. @return block, NULL if not found */ UNIV_INLINE buf_block_t* buf_block_hash_get( /*===============*/ ulint space, /*!< in: space id */ ulint offset) /*!< in: offset of the page within space */ { return(buf_page_get_block(buf_page_hash_get(space, offset))); } /********************************************************************//** Returns TRUE if the page can be found in the buffer pool hash table. NOTE that it is possible that the page is not yet read from disk, though. @return TRUE if found in the page hash table */ UNIV_INLINE ibool buf_page_peek( /*==========*/ ulint space, /*!< in: space id */ ulint offset) /*!< in: page number */ { const buf_page_t* bpage; //buf_pool_mutex_enter(); rw_lock_s_lock(&page_hash_latch); bpage = buf_page_hash_get(space, offset); //buf_pool_mutex_exit(); rw_lock_s_unlock(&page_hash_latch); return(bpage != NULL); } /********************************************************************//** Releases a compressed-only page acquired with buf_page_get_zip(). */ UNIV_INLINE void buf_page_release_zip( /*=================*/ buf_page_t* bpage) /*!< in: buffer block */ { buf_block_t* block; ut_ad(bpage); ut_a(bpage->buf_fix_count > 0); switch (buf_page_get_state(bpage)) { case BUF_BLOCK_ZIP_PAGE: case BUF_BLOCK_ZIP_DIRTY: mutex_enter(&buf_pool_zip_mutex); bpage->buf_fix_count--; mutex_exit(&buf_pool_zip_mutex); return; case BUF_BLOCK_FILE_PAGE: block = (buf_block_t*) bpage; mutex_enter(&block->mutex); #ifdef UNIV_SYNC_DEBUG rw_lock_s_unlock(&block->debug_latch); #endif bpage->buf_fix_count--; mutex_exit(&block->mutex); return; case BUF_BLOCK_ZIP_FREE: case BUF_BLOCK_NOT_USED: case BUF_BLOCK_READY_FOR_USE: case BUF_BLOCK_MEMORY: case BUF_BLOCK_REMOVE_HASH: break; } ut_error; } /********************************************************************//** Decrements the bufferfix count of a buffer control block and releases a latch, if specified. */ UNIV_INLINE void buf_page_release( /*=============*/ buf_block_t* block, /*!< in: buffer block */ ulint rw_latch, /*!< in: RW_S_LATCH, RW_X_LATCH, RW_NO_LATCH */ mtr_t* mtr __attribute__((unused))) /*!< in: mtr */ { ut_ad(block); ut_a(buf_block_get_state(block) == BUF_BLOCK_FILE_PAGE); ut_a(block->page.buf_fix_count > 0); /* buf_flush_note_modification() should be called before this function. */ /* if (rw_latch == RW_X_LATCH && mtr->modifications) { buf_pool_mutex_enter(); buf_flush_note_modification(block, mtr); buf_pool_mutex_exit(); } */ mutex_enter(&block->mutex); #ifdef UNIV_SYNC_DEBUG rw_lock_s_unlock(&(block->debug_latch)); #endif block->page.buf_fix_count--; mutex_exit(&block->mutex); if (rw_latch == RW_S_LATCH) { rw_lock_s_unlock(&(block->lock)); } else if (rw_latch == RW_X_LATCH) { rw_lock_x_unlock(&(block->lock)); } } #ifdef UNIV_SYNC_DEBUG /*********************************************************************//** Adds latch level info for the rw-lock protecting the buffer frame. This should be called in the debug version after a successful latching of a page if we know the latching order level of the acquired latch. */ UNIV_INLINE void buf_block_dbg_add_level( /*====================*/ buf_block_t* block, /*!< in: buffer page where we have acquired latch */ ulint level) /*!< in: latching order level */ { sync_thread_add_level(&block->lock, level); } #endif /* UNIV_SYNC_DEBUG */ #endif /* !UNIV_HOTBACKUP */