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fsp0fsp.cc
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fsp0fsp.cc
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#include "fsp0fsp.h"
#include "buf0buf.h"
#include "fil0fil.h"
#include "sync0sync.h"
#include "mtr0log.h"
#include "fut0fut.h"
#include "ut0byte.h"
#include "srv0srv.h"
#include "page0types.h"
#include "ibuf0ibuf.h"
#include "btr0btr.h"
#include "btr0sea.h"
#include "dict0boot.h"
#include "dict0mem.h"
#include "log0log.h"
typedef byte fsp_header_t;
typedef byte fseg_inode_t;
typedef byte xdes_t;
#define FSP_HEADER_OFFSET FIL_PAGE_DATA
#define FSP_NOT_USED 0
#define FSP_SIZE 8 /*当前space最大可容纳的page数,文件扩大时才会改变这个值*/
#define FSP_FREE_LIMIT 12 /*当前space已经分配初始化的page数*/
#define FSP_LOWEST_NO_WRITE 16 /*好像没有什么用处*/
#define FSP_FRAG_N_USED 20 /*FSP_FREE_FRAG列表中已经被使用的page数*/
#define FSP_FREE 24 /*space中可用的extent对象列表*/
/*FLST_BASE_NODE_SIZE = 16*/
#define FSP_FREE_FRAG (24 + FLST_BASE_NODE_SIZE) /*space当前空闲的extent列表*/
#define FSP_FULL_FRAG (24 + 2 * FLST_BASE_NODE_SIZE) /*space当前完全占用的extent列表，里面么有空闲页*/
#define FSP_SEG_ID (24 + 3 * FLST_BASE_NODE_SIZE) /*space中下一个空闲的segment的ID*/
#define FSP_SEG_INODES_FULL (32 + 3 * FLST_BASE_NODE_SIZE) /*space当前完全占满的segment inodes pages*/
#define FSP_SEG_INODES_FREE (32 + 4 * FLST_BASE_NODE_SIZE) /*space当前空闲的segment inode pages*/
/*file space header size*/
#define FSP_HEADER_SIZE (32 + 5 * FLST_BASE_NODE_SIZE) /*space header的头长度*/
#define FSP_FREE_ADD 4
/*segment inode*/
#define FSEG_INODE_PAGE_NODE FSEG_PAGE_DATA
/*FLST_NODE_SIZE = 12*/
#define FSEG_ARR_OFFSET (FSEG_PAGE_DATA + FLST_NODE_SIZE)
#define FSEG_ID 0 /*8字节, segment id*/
#define FSEG_NOT_FULL_N_USED 8 /*FSEG_NOT_FULL列表中的page数*/
#define FSEG_FREE 12 /*segment空闲的extent列表*/
#define FSEG_NOT_FULL (12 + FLST_BASE_NODE_SIZE) /*没有完全占满的extent的队列*/
#define FSEG_FULL (12 + 2 * FLST_BASE_NODE_SIZE) /*完全占满的extent的队列*/
#define FSEG_MAGIC_N (12 + 3 * FLST_BASE_NODE_SIZE) /*segment的魔法字，用于校验*/
#define FSEG_FRAG_ARR (16 + 3 * FLST_BASE_NODE_SIZE) /*segment frag addr偏移量*/
#define FSEG_FRAG_ARR_N_SLOTS (FSP_EXTENT_SIZE / 2) /*fragment page(应该是extent头页)的slots,slot中存储的是page no*/
#define FSEG_FRAG_SLOT_SIZE 4
/*segment inode的长度,segment的最后32个page no slot数组*/
#define FSEG_INODE_SIZE (16 + 3 * FLST_BASE_NODE_SIZE + FSEG_FRAG_ARR_N_SLOTS * FSEG_FRAG_SLOT_SIZE)
/*单个页可以存放segment inode对象的个数*/
#define FSP_SEG_INODES_PER_PAGE ((UNIV_PAGE_SIZE - FSEG_ARR_OFFSET - 10) / FSEG_INODE_SIZE)
/*segment 魔法字的值*/
#define FSEG_MAGIC_N_VALUE 97937874
#define FSEG_FILLFACTOR 8 /*segment的页分配因子*/
#define FSEG_FRAG_LIMIT FSEG_FRAG_ARR_N_SLOTS /*segment inode中extent头页的数量上限*/
#define FSEG_FREE_LIST_LIMIT 40 /*segment最大的extent数量*/
#define FSEG_FREE_LIST_MAX_LEN 4
/*区(extent)*/
#define XDES_ID 0 /*extent id,8字节*/
#define XDES_FLST_NODE 8 /*一个定位extent page的ffil_addr_t对，prev和next*/
#define XDES_STATE (FLST_NODE_SIZE + 8) /*extent的状态,XDES_FREE、XDES_FREE_FRAG、XDES_FULL_FRAG、XDES_FSEG*/
#define XDES_BITMAP (FLST_NODE_SIZE + 12) /*页状态位图*/
#define XDES_BITS_PER_PAGE 2
#define XDES_FREE_BIT 0
#define XDES_CLEAN_BIT 1
#define XDES_FREE 1
#define XDES_FREE_FRAG 2
#define XDES_FULL_FRAG 3
#define XDES_FSEG 4
#define XDES_SIZE (XDES_BITMAP + (FSP_EXTENT_SIZE * XDES_BITS_PER_PAGE + 7) / 8) /*40*/
#define XDES_ARR_OFFSET (FSP_HEADER_OFFSET + FSP_HEADER_SIZE) /*150*/
/********************************************************************/
/*释放一个extent到space的free list中*/
static void fsp_free_extent(ulint space, ulint page, mtr_t* mtr);
/*释放segment中的一个extent到space free list中*/
static void fseg_free_extent(fseg_inode_t* seg_inode, ulint space, ulint page, mtr_t* mtr);
/*计算fseg_inode当中所有的page数和已经使用的page数量*/
static ulint fseg_n_reserved_pages_low(fseg_inode_t* header, ulint* used, mtr_t* mtr);
/*标记一个page已经被占用了*/
static void fseg_mark_page_used(fseg_inode_t* seg_inde, ulint space, ulint page, mtr_t* mtr);
/*获得fseg node中第一个extent*/
static xdes_t* fseg_get_first_extent(fseg_inode_t* inode, mtr_t* mtr);
static void fsp_fill_free_list(ulint space, fsp_header_t* header, mtr_t* mtr);
static ulint fseg_alloc_free_page_low(ulint space, fseg_inode_t* seg_inode, ulint hint, byte direction, mtr_t* mtr);
/*********************************************************************/
/*获取space header的缓冲区指针*/
UNIV_INLINE fsp_header_t* fsp_get_space_header(ulint space_id, mtr_t* mtr)
{
fsp_header_t* header;
ut_ad(mtr);
/*获得space header缓冲区*/
header = buf_page_get(space_id, 0, RW_X_LATCH, mtr) + FSP_HEADER_OFFSET;
buf_page_dbg_add_level(header, SYNC_FSP_PAGE);
return header;
}
/*判断xdes指定的bitmap上的值是否是1*/
UNIV_INLINE ibool xdes_get_bit(xdes_t* descr, ulint bit, ulint offset, mtr_t* mtr)
{
ulint index;
ulint byte_index;
ulint bit_index;
/*mtr一定持有X LATCH*/
ut_ad(mtr_memo_contains(mtr, buf_block_align(descr), MTR_MEMO_PAGE_X_FIX));
ut_ad((bit == XDES_FREE_BIT) || (bit == XDES_CLEAN_BIT));
ut_ad(offset < FSP_EXTENT_SIZE);
/*每个页占2个bit，第一个bit表示free状态，第二个bit表示clean状态*/
index = bit + XDES_BITS_PER_PAGE * offset;
byte_index = index / 8;
bit_index = index % 8;
/*读取xdes中对应的bit并判断是否为1*/
return ut_bit_get_nth(mtr_read_ulint(descr + XDES_BITMAP + byte_index, MLOG_1BYTE, mtr), bit_index);
}
UNIV_INLINE void xdes_set_bit(xdes_t* descr, ulint bit, ulint offset, ibool val, mtr_t* mtr)
{
ulint index;
ulint byte_index;
ulint bit_index;
ulint descr_byte;
ut_ad(mtr_memo_contains(mtr, buf_block_align(descr), MTR_MEMO_PAGE_X_FIX));
ut_ad((bit == XDES_FREE_BIT) || (bit == XDES_CLEAN_BIT));
ut_ad(offset < FSP_EXTENT_SIZE);
index = bit + XDES_BITS_PER_PAGE * offset;
byte_index = index / 8;
bit_index = index % 8;
descr_byte = mtr_read_ulint(descr + XDES_BITMAP + byte_index, MLOG_1BYTE, mtr);
descr_byte = ut_bit_set_nth(descr_byte, bit_index, val);
mlog_write_ulint(descr + XDES_BITMAP + byte_index, descr_byte, MLOG_1BYTE, mtr);
}
/*从hint出由低到高进行查找*/
UNIV_INLINE ulint xdes_find_bit(xdes_t* descr, ulint bit,ibool val, ulint hint, mtr_t* mtr)
{
ulint i;
ut_ad(descr && mtr);
ut_ad(val <= TRUE);
ut_ad(hint < FSP_EXTENT_SIZE);
ut_ad(mtr_memo_contains(mtr, buf_block_align(descr), MTR_MEMO_PAGE_X_FIX));
/*hint是bit推断的位置，可能就bit存在的位置*/
for(i = hint; i < FSP_EXTENT_SIZE; i ++){
if(val == xdes_get_bit(descr, bit, i, mtr))
return i;
}
for(i = 0; i < hint; i ++){
if(val == xdes_get_bit(descr, bit, i, mtr))
return i;
}
return ULINT_UNDEFINED;
}
/*从hint出由高到低进行查找*/
UNIV_INLINE ulint xdes_find_bit_downward(xdes_t* descr, ulint bit, ibool val, ulint hint, mtr_t* mtr)
{
ulint i;
ut_ad(descr && mtr);
ut_ad(val <= TRUE);
ut_ad(hint < FSP_EXTENT_SIZE);
ut_ad(mtr_memo_contains(mtr, buf_block_align(descr), MTR_MEMO_PAGE_X_FIX));
for(i = hint + 1; i > 0; i --){
if(val == xdes_get_bit(descr, bit, i - 1, mtr))
return i - 1;
}
for(i = FSP_EXTENT_SIZE - 1; i > hint; i --){
if(val = xdes_get_bit(descr, bit, i, mtr))
return i;
}
return ULINT_UNDEFINED;
}
/*返回已经xdes descr中已使用的page数量，通过free位来判断*/
UNIV_INLINE ulint xdes_get_n_used(xdes_t* descr, mtr_t* mtr)
{
ulint i;
ulint count = 0;
ut_ad(descr && mtr);
ut_ad(mtr_memo_contains(mtr, buf_block_align(descr), MTR_MEMO_PAGE_X_FIX));
for(i = 0; i < FSP_EXTENT_SIZE; i ++){
if(xdes_get_bit(descr, XDES_FREE_BIT, i, mtr) == FALSE) /*FASLSE表示被占用了*/
count ++;
}
return count;
}
/*判断一个区是否空闲*/
UNIV_INLINE ibool xdes_is_free(xdes_t* descr, mtr_t* mtr)
{
if(0 == xdes_get_n_used(descr, mtr))
return TRUE;
else
return FALSE;
}
/*判断一个区是否满了*/
UNIV_INLINE ibool xdes_is_full(xdes_t* descr, mtr_t* mtr)
{
if(xdes_get_n_used(descr, mtr) == FSP_EXTENT_SIZE)
return TRUE;
else
return FALSE;
}
/*设置extent的状态*/
UNIV_INLINE void xdes_set_state(xdes_t* descr, ulint state, mtr_t* mtr)
{
ut_ad(descr && mtr);
ut_ad(state >= XDES_FREE);
ut_ad(state <= XDES_FSEG);
ut_ad(mtr_memo_contains(mtr, buf_block_align(descr), MTR_MEMO_PAGE_X_FIX));
mlog_write_ulint(descr + XDES_STATE, state, MLOG_4BYTES, mtr);
}
UNIV_INLINE ulint xdes_get_state(xdes_t* descr, mtr_t* mtr)
{
ut_ad(descr && mtr);
ut_ad(mtr_memo_contains(mtr, buf_block_align(descr), MTR_MEMO_PAGE_X_FIX));
return mtr_read_ulint(descr + XDES_STATE, MLOG_4BYTES, mtr);
}
UNIV_INLINE void xdes_init(xdes_t* descr, mtr_t* mtr)
{
ulint i;
ut_ad(descr && mtr);
ut_ad(mtr_memo_contains(mtr, buf_block_align(descr), MTR_MEMO_PAGE_X_FIX));
ut_ad((XDES_SIZE - XDES_BITMAP) % 4 == 0);
/*初始化bitmap,全部page bit为1*/
for(i = XDES_BITMAP, i < XDES_SIZE; i += 4){
mlog_write_ulint(descr + i, 0xFFFFFFFF, MLOG_4BYTES, mtr);
}
/*设置extent free状态*/
xdes_set_state(descr, XDES_FREE, mtr);
}
/*offset按page size对齐*/
UNIV_INLINE ulint xdes_calc_descriptor_page(ulint offset)
{
ut_ad(UNIV_PAGE_SIZE > XDES_ARR_OFFSET + (XDES_DESCRIBED_PER_PAGE / FSP_EXTENT_SIZE) * XDES_SIZE);
return ut_2pow_round(offset, XDES_DESCRIBED_PER_PAGE);
}
/*计算offset对应page 的extent描述索引*/
UNIV_INLINE ulint xdes_calc_descriptor_index(ulint offset)
{
ut_2pow_remainder(offset, XDES_DESCRIBED_PER_PAGE) / FSP_EXTENT_SIZE;
}
UNIV_INLINE xdes_t* xdes_get_descriptor_with_space_hdr(fsp_header_t* sp_header, ulint space, ulint offset, mtr_t* mtr)
{
ulint limit;
ulint size;
ulint descr_page_no;
ulint descr_page;
ut_ad(mtr);
ut_ad(mtr_memo_contains(mtr, fil_space_get_latch(space), MTR_MEMO_X_LOCK));
limit = mtr_read_ulint(sp_header + FSP_FREE_LIMIT, MLOG_4BYTES, mtr);
size = mtr_read_ulint(sp_header + FSP_SIZE, MLOG_4BYTES, mtr);
if(offset >= size || offset > limit)
return NULL;
/*已经到了limit上限，进行开辟新的extent*/
if(offset == limit)
fsp_fill_free_list(space, sp_header, mtr);
/*计算对应的xdesc page no*/
descr_page_no = xdes_calc_descriptor_page(offset);
if(descr_page_no == 0)
descr_page = buf_frame_align(sp_header);
else{
descr_page = buf_page_get(space, descr_page_no, RW_X_LATCH, mtr); /*获得descr_page_no对应的指针地址*/
buf_page_dbg_add_level(descr_page, SYNC_FSP_PAGE);
}
/*返回offset对应的xdes descr的指针地址*/
return (descr_page + XDES_ARR_OFFSET + XDES_SIZE * xdes_calc_descriptor_index(offset));
}
/*通过offset获取space对应的extent描述指针*/
static xdes_t* xdes_get_descriptor(ulint space, ulint offset, mtr_t* mtr)
{
fsp_header_t* sp_header;
sp_header = FSP_HEADER_OFFSET + buf_page_get(space, 0, RW_X_LATCH, mtr);
buf_page_dbg_add_level(sp_header, SYNC_FSP_PAGE);
return xdes_get_descriptor_with_space_hdr(sp_header, space, offset, mtr);
}
/*通过fil_addr获得extent指针*/
UNIV_INLINE xdes_t* xdes_lst_get_descriptor(ulint space, fil_addr_t lst_node, mtr_t* mtr)
{
xdes_t* descr;
ut_ad(mtr);
ut_ad(mtr_memo_contains(mtr, fil_space_get_latch(space), MTR_MEMO_X_LOCK));
descr = fut_get_ptr(space, lst_node, RW_X_LATCH, mtr) - XDES_FLST_NODE;
return descr;
}
/*获得descr对应链表中的下一个xdes entry*/
UNIV_INLINE xdes_t* xdes_ls_get_next(xdes_t* descr, mtr_t* mtr)
{
ulint space;
ut_ad(mtr & descr);
space = buf_frame_get_space_id(descr);
return xdes_lst_get_descriptor(space, flst_get_next_addr(descr + XDES_FLST_NODE, mtr), mtr);
}
/*descr对应物理地址的偏移量，与xdes_get_descriptor函数正好相反，*/
UNIV_INLINE ulint xdes_get_offset(xdes_t* descr)
{
ut_ad(descr);
return buf_frame_get_page_no(descr) + ((descr - buf_frame_align(descr) - XDES_ARR_OFFSET) / XDES_SIZE) * FSP_EXTENT_SIZE;
}
/*初始化一个page页*/
static void fsp_init_file_page_low(byte* ptr)
{
page_t* page;
page = buf_frame_align(ptr);
/*初始化page trailer lsn*/
mach_write_to_8(page + UNIV_PAGE_SIZE - FIL_PAGE_END_LSN, ut_dulint_zero);
/*初始化page lsn*/
mach_write_to_8(page + FIL_PAGE_LSN, ut_dulint_zero);
}
void fsp_init_file_page(page_t* page, mtr_t* mtr)
{
/*初始化一个页*/
fsp_init_file_page_low(page);
/*记录一个初始化页的mtr日志*/
mlog_write_initial_log_record(page, MLOG_INIT_FILE_PAGE, mtr);
}
/*解析并执行一个初始化页的redo log,在重做日志时调用*/
byte* fsp_parse_init_file_page(byte* ptr, byte* end_ptr, page_t* page)
{
ut_ad(ptr && end_ptr);
if(page)
fsp_init_file_page_low(page);
return ptr;
}
void fsp_init()
{
}
/*初始化space header*/
void fsp_header_init(ulint space, ulint size, mtr_t* mtr)
{
fsp_header_t* header;
page_t* page;
ut_ad(mtr);
/*获得space mtr的x-latch控制权*/
mtr_x_lock(fil_space_get_latch(space), mtr);
/*创建一个初始化页*/
page = buf_page_create(space, 0, mtr);
buf_page_dbg_add_level(page, SYNC_FSP_PAGE);
/*获得page的X_LATCH*/
buf_page_get(space, 0, RW_X_LATCH, mtr);
buf_page_dbg_add_level(page, SYNC_FSP_PAGE);
/*对页进行初始化*/
fsp_init_file_page(page, mtr);
/*获得space header的指针*/
header = FSP_HEADER_OFFSET + page;
/*对头信息进行初始化*/
mlog_write_ulint(header + FSP_SIZE, size, MLOG_4BYTES, mtr);
mlog_write_ulint(header + FSP_FREE_LIMIT, 0, MLOG_4BYTES, mtr);
mlog_write_ulint(header + FSP_LOWEST_NO_WRITE, 0, MLOG_4BYTES, mtr);
mlog_write_ulint(header + FSP_FRAG_N_USED, 0, MLOG_4BYTES, mtr);
/*初始化各类磁盘列表*/
flst_init(header + FSP_FREE, mtr);
flst_init(header + FSP_FREE_FRAG, mtr);
flst_init(header + FSP_FULL_FRAG, mtr);
flst_init(header + FSP_SEG_INODES_FULL, mtr);
flst_init(header + FSP_SEG_INODES_FREE, mtr);
/*赋值seg_id*/
mlog_write_dulint(header + FSP_SEG_ID, ut_dulint_create(0, 1), MLOG_8BYTES, mtr);
/*开辟新的一些可用的extent*/
fsp_fill_free_list(space, header, mtr);
/*建立一个btree*/
btr_create(DICT_CLUSTERED | DICT_UNIVERSAL | DICT_IBUF, space, ut_dulint_add(DICT_IBUF_ID_MIN, space), mtr);
}
/*增加space的长度*/
void fsp_header_inc_size(ulint space, ulint size_inc, mtr_t* mtr)
{
fsp_header_t* header;
ulint size;
ut_ad(mtr);
mtr_x_lock(fil_space_get_latch(space), mtr);
header = fsp_get_space_header(space, mtr);
size = mtr_read_ulint(header + FSP_SIZE, MLOG_4BYTES, mtr);
mlog_write_ulint(header + FSP_SIZE, size + size_inc, MLOG_4BYTES, mtr);
}
ulint fsp_header_get_free_limit(ulint space)
{
fsp_header_t* header;
ulint limit;
mtr_t mtr;
ut_a(space == 0);
mtr_start(&mtr);
mtr_x_lock(fil_space_get_latch(space), &mtr);
header = fsp_get_space_header(space, &mtr);
limit = mtr_read_ulint(header + FSP_FREE_LIMIT, MLOG_4BYTES, &mtr);
limit = limit / ((1024 * 1024) / UNIV_PAGE_SIZE);
/*设置log的checkpoint limit*/
log_fsp_current_free_limit_set_and_checkpoint(limit);
mtr_commit(&mtr);
return limit;
}
/*获得表空间的size*/
ulint fsp_header_get_tablespace_size(ulint space)
{
fsp_header_t* header;
ulint size;
mtr_t mtr;
mtr_start(&mtr);
mtr_x_lock(fil_space_get_latch(space), &mtr);
header = fsp_get_space_header(space, mtr);
size = mtr_read_ulint(header + FSP_SIZE, MLOG_4BYTES, &mtr);
mtr_commit(&mtr);
return size;
}
/*尝试扩大last data file，加入文件定义的是自动扩大*/
static ibool fsp_try_extend_last_file(ulint* actual_increase, ulint space, fsp_header_t* header, mtr_t* mtr)
{
ulint size;
ulint size_increase;
ibool success;
ut_a(space == 0);
*actual_increase = 0;
/*不是文件自动放大的*/
if(!srv_auto_extend_last_data_file)
return FALSE;
/*确定扩大的大小*/
size = mtr_read_ulint(header + FSP_SIZE, MLOG_4BYTES, mtr);
if(srv_last_file_size_max != 0){
if(srv_last_file_size_max < srv_data_file_sizes[srv_n_data_files - 1]){
fprintf(stderr, "InnoDB: Error: Last data file size is %lu, max size allowed %lu\n",
srv_data_file_sizes[srv_n_data_files - 1], srv_last_file_size_max);
}
size_increase = srv_last_file_size_max - srv_data_file_sizes[srv_n_data_files - 1];
if(size_increase > SRV_AUTO_EXTEND_INCREMENT)
size_increase = SRV_AUTO_EXTEND_INCREMENT;
}
else
size_increase = SRV_AUTO_EXTEND_INCREMENT;
if(size_increase == 0)
return TRUE;
/*放大最后data file,扩大部分用0填充数据*/
success = fil_extend_last_data_file(actual_increase, size_increase);
if(success) /*重新设置space size*/
mlog_write_ulint(header + FSP_SIZE, size + *actual_increase, MLOG_4BYTES, mtr);
return TRUE;
}
static void fsp_fill_free_list(ulint space, fsp_header_t* header, mtr_t* mtr)
{
ulint limit;
ulint size;
xdes_t* descr;
ulint count = 0;
ulint frag_n_used;
page_t* descr_page;
page_t* ibuf_page;
ulint actual_increase;
ulint i;
mtr_t ibuf_mtr;
ut_ad(header && mtr);
/*获得space size*/
size = mtr_read_ulint(header + FSP_SIZE, MLOG_4BYTES, mtr);
/*获得space limit*/
limit = mtr_read_ulint(header + FSP_FREE_LIMIT, MLOG_4BYTES, mtr);
/*判断是否要放大空间*/
if(srv_auto_extend_last_data_file && size < limit + FSP_EXTENT_SIZE * FSP_FREE_ADD){
fsp_try_extend_last_file(&actual_increase, space, header, mtr);
size = mtr_read_ulint(header + FSP_SIZE, MLOG_4BYTES, mtr);
}
i = limit;
/*一个区包含64页,每次分配4个extent entry，4M的空间*/
while((i + FSP_EXTENT_SIZE <= size) && count < FSP_FREE_ADD){
mlog_write_ulint(header + FSP_FREE_LIMIT, i + FSP_EXTENT_SIZE, MLOG_4BYTES, mtr);
log_fsp_current_free_limit_set_and_checkpoint((i + FSP_EXTENT_SIZE)/ ((1024 * 1024) / UNIV_PAGE_SIZE));
if(0 == i % XDES_DESCRIBED_PER_PAGE){ /*初始化一个extent desc page,*/
if(i > 0){
descr_page = buf_page_create(space, i, mtr);
buf_page_dbg_add_level(descr_page,SYNC_FSP_PAGE);
buf_page_get(space, i, RW_X_LATCH, mtr);
buf_page_dbg_add_level(descr_page,SYNC_FSP_PAGE);
fsp_init_file_page(descr_page, mtr);
}
mtr_start(&ibuf_mtr);
/*进行ibuf bitmap page的初始化,每16K page必须有一个ibuf bitmap page*/
ibuf_page = buf_page_create(space, i + FSP_IBUF_BITMAP_OFFSET, &ibuf_mtr);
buf_page_dbg_add_level(ibuf_page, SYNC_IBUF_BITMAP);
buf_page_get(space, i + FSP_IBUF_BITMAP_OFFSET, RW_X_LATCH, &ibuf_mtr);
buf_page_dbg_add_level(ibuf_page, SYNC_FSP_PAGE);
fsp_init_file_page(ibuf_page, &ibuf_mtr);
/*初始化一个bitmap page*/
ibuf_bitmap_page_init(ibuf_page, &ibuf_mtr);
mtr_commit(&ibuf_mtr);
}
/*获得区描述并初始化区*/
descr = xdes_get_descriptor_with_space_hdr(header, space, i, mtr);
xdes_init(descr, mtr);
ut_ad(XDES_DESCRIBED_PER_PAGE % FSP_EXTENT_SIZE == 0);
/*设置extent entry对应bitmap上的状态*/
if(0 == i % XDES_DESCRIBED_PER_PAGE){
xdes_set_bit(descr, XDES_FREE_BIT, 0, FALSE, mtr);
xdes_set_bit(descr, XDES_FREE_BIT, FSP_IBUF_BITMAP_OFFSET, FALSE, mtr); /*设置ibuf bitmap page对应的xdes free占用的标识*/
/*表明这个extent entry已经有一部分page被使用了*/
xdes_set_state(descr, XDES_FREE_FRAG, mtr);
flst_add_last(header + FSP_FREE_FRAG, descr + XDES_FLST_NODE, mtr);
frag_n_used = mtr_read_ulint(header + FSP_FRAG_N_USED, MLOG_4BYTES, mtr);
/*一个xdes page和一个ibuf bitmap page被占用*/
mlog_write_ulint(header + FSP_FRAG_N_USED, frag_n_used + 2, MLOG_4BYTES, mtr);
}
else{ /*增加空闲的extent entry(xdes_t)*/
flst_add_last(header + FSP_FREE, descr + XDES_FLST_NODE, mtr);
count ++;
}
/*继续下一个extent*/
i += FSP_EXTENT_SIZE;
}
}
/*获得一个新的空闲的extent*/
static xdes_t* fsp_alloc_free_extent(ulint space, ulint hint, mtr_t* mtr)
{
fsp_header_t* header;
fil_addr_t first;
xdes_t* descr;
ut_ad(mtr);
/*获得头信息和头信息中可用的extent*/
header = fsp_get_space_header(space, mtr);
/*hint可能是上次申请的位置，只需要申请后面的就行了，hint不大于limit,获得hint对应xdes desc*/
descr = xdes_get_descriptor_with_space_hdr(header, space, hint, mtr);
if(descr && (xdes_get_state(descr, mtr) == XDES_FREE)){
}
else{
first = flst_get_first(header + FSP_FREE, mtr);
if(fil_addr_is_null(first)){ /*free list是空的，增加新可用的extent*/
fsp_fill_free_list(space, header, mtr);
first = flst_get_first(header + FSP_FREE, mtr);
}
if(fil_addr_is_null(first))
return NULL;
/*获得first对应的xdes的描述*/
descr = xdes_lst_get_descriptor(space, first, mtr);
}
/*从可用的队列中删除掉已经分配的node*/
flst_remove(header + FSP_FREE, descr + XDES_FLST_NODE, mtr);
return descr;
}
static ulint fsp_alloc_free_page(ulint space, ulint hint, mtr_t* mtr)
{
fsp_header_t* header;
fil_addr_t first;
xdes_t* descr;
page_t* page;
ulint free;
ulint frag_n_used;
ulint page_no;
ut_ad(mtr);
header = fsp_get_space_header(space, mtr);
descr = xdes_get_descriptor_with_space_hdr(header, space, hint, mtr);
if(descr && (xdes_get_state(descr, mtr) == XDES_FREE_FRAG)){
}
else{
first = flst_get_first(header + FSP_FREE_FRAG, mtr);
if(fil_addr_is_null(first)){ /*第一个extent不是NULL,在FSP_FREE获取一个新的*/
descr = fsp_alloc_free_extent(space, hint, mtr);
if(descr == NULL)
return FIL_NULL;
xdes_set_state(descr, XDES_FREE_FRAG, mtr);
flst_add_last(header + FSP_FREE_FRAG, descr + XDES_FLST_NODE, mtr);
}
else
descr = xdes_lst_get_descriptor(space, first, mtr);
hint = 0;
}
/*查找可以用的页*/
free = xdes_find_bit(descr, XDES_FREE_BIT, TRUE, hint % FSP_EXTENT_SIZE, mtr);
ut_a(free != NULL);
/*设置bitmap占用标志*/
xdes_set_bit(descr, XDES_FREE_BIT, free, FALSE, mtr);
frag_n_used = mtr_read_ulint(header + FSP_FRAG_N_USED, MLOG_4BYTES, mtr);
frag_n_used ++;
/*修改已经使用的页数量*/
mlog_write_ulint(header + FSP_FRAG_N_USED, frag_n_used, MLOG_4BYTES, mtr);
if(xdes_is_full(descr, mtr)){/*entry entry的页被占满了*/
flst_remove(header + FSP_FREE_FRAG, descr + XDES_FLST_NODE, mtr);
xdes_set_state(descr, XDES_FULL_FRAG, mtr);
flst_add_last(header + FSP_FULL_FRAG, descr + XDES_FLST_NODE, mtr);
mlog_write_ulint(header + FSP_FRAG_N_USED, frag_n_used - FSP_EXTENT_SIZE, MLOG_4BYTES, mtr);
}
page_no = xdes_get_offset(descr) + free;
/*建立并初始化一个页*/
buf_page_create(space, page_no, mtr);
page = buf_page_get(space, page_no, RW_X_LATCH, mtr);
buf_page_dbg_add_level(page, SYNC_FSP_PAGE);
fsp_init_file_page(page, mtr);
return page_no;
}
static void fsp_free_page(ulint space, ulint page, mtr_t* mtr)
{
fsp_header_t* header;
xdes_t* descr;
ulint state;
ulint frag_n_used;
char buf[1000];
ut_ad(mtr);
header = fsp_get_space_header(space, mtr);
/*获得page对应的xdes*/
descr = xdes_get_descriptor_with_space_hdr(header, space, page, mtr);
state = xdes_get_state(descr, mtr);
if(state != XDES_FREE_FRAG && state != XDES_FULL_FRAG){ /*xdes desc的状态出错了*/
fprintf(stderr,"InnoDB: Error: File space extent descriptor of page %lu has state %lu\n", page, state);
ut_sprintf_buf(buf, ((byte*)descr) - 50, 200);
fprintf(stderr, "InnoDB: Dump of descriptor: %s\n", buf);
if(state == XDES_FREE)
return;
ut_a(0);
}
/*bitmap中的标志已经是可用状态*/
if(xdes_get_bit(descr, XDES_FREE_BIT, page % FSP_EXTENT_SIZE, mtr)){
fprintf(stderr, "InnoDB: Error: File space extent descriptor of page %lu says it is free\n", page);
ut_sprintf_buf(buf, ((byte*)descr) - 50, 200);
fprintf(stderr, "InnoDB: Dump of descriptor: %s\n", buf);
return;
}
/*修改xdes desc对应的状态*/
xdes_set_bit(descr, XDES_FREE_BIT, page % FSP_EXTENT_SIZE, TRUE, mtr);
xdes_set_bit(descr, XDES_CLEAN_BIT, page % FSP_EXTENT_SIZE, TRUE, mtr);
frag_n_used = mtr_read_ulint(header + FSP_FRAG_N_USED, MLOG_4BYTES, mtr);
if(state == XDES_FULL_FRAG){
flst_remove(header + FSP_FULL_FRAG, descr + XDES_FLST_NODE, mtr);
xdes_set_state(descr, FSP_FREE_FRAG, mtr);
flst_add_last(header + FSP_FREE_FRAG, descr + XDES_FLST_NODE, mtr);
/*修改当前区占用的页个数，如果一个页释放了在一个满的区里面，那么应该是区最大PAGE数量 -1，有一个extent有full变成frag free*/
mlog_write_ulint(header + FSP_FRAG_N_USED, frag_n_used + FSP_EXTENT_SIZE - 1, MLOG_4BYTES, mtr);
}
else{
ut_a(frag_n_used > 0);
mlog_write_ulint(header + FSP_FRAG_N_USED, frag_n_used - 1, MLOG_4BYTES, mtr);
}
if(xdes_is_free(descr, mtr)){ /*区是完全空闲了，从FSP_FREE_FRAG中删除，放入FSP_FREE当中*/
flst_remove(header + FSP_FREE_FRAG, descr + XDES_FLST_NODE, mtr);
/*释放掉extent,其实就是放入FSP_FREE*/
fsp_free_extent(space, page, mtr);
}
}
static void fsp_free_extent(ulint space, ulint page, mtr_t* mtr)
{
fsp_header_t* header;
xdes_t* descr;
ut_ad(mtr);
header = fsp_get_space_header(space, mtr);
descr = xdes_get_descriptor_with_space_hdr(header, space, page, mtr);
ut_a(xdes_get_state(descr, mtr) != XDES_FREE);
/*清空xdes*/
xdes_init(descr, mtr);
flst_add_last(header + FSP_FREE, descr + XDES_FLST_NODE, mtr);
}
UNIV_INLINE fseg_inode_t* fsp_seg_inode_page_get_nth_inode(page_t* page, ulint i, mtr_t* mtr)
{
ut_ad(i < FSP_SEG_INODES_PER_PAGE);
ut_ad(mtr_memo_contains(mtr, buf_block_align(page), MTR_MEMO_PAGE_X_FIX));
return(page + FSEG_ARR_OFFSET + FSEG_INODE_SIZE * i);
}
static ulint fsp_seg_inode_page_find_used(page_t* page, mtr_t* mtr)
{
ulint i;
fseg_inode_t* inode;
for(i = 0; i < FSP_SEG_INODES_PER_PAGE; i ++){
inode = fsp_seg_inode_page_get_nth_inode(page, i, mtr);
if(ut_dulint_cmp(mach_read_from_8(inode + FSEG_ID), ut_dulint_zero) != 0)
return i;
}
return ULINT_UNDEFINED;
}
static ulint fsp_seg_inode_page_find_free(page_t* page, ulint j, mtr_t* mtr)
{
ulint i;
fseg_inode_t* inode;
for(i = j; i < FSP_SEG_INODES_PER_PAGE; i ++){
inode = fsp_seg_inode_page_get_nth_inode(page, i, mtr);
if(ut_dulint_cmp(mach_read_from_8(inode + FSEG_ID), ut_dulint_zero) == 0)
return i;
}
return ULINT_UNDEFINED;
}
/*分配一个空闲的inode页*/
static bool fsp_alloc_seg_inode_page(fsp_header_t* space_header, mtr_t* mtr)
{
fseg_inode_t* inode;
page_t* page;
ulint page_no;
ulint space;
ulint i;
space = buf_frame_get_sapce_id(space_header);
page_no = fsp_alloc_free_page(space, 0, mtr); /*获得一个空闲的page*/
if(page_no == FIL_NULL)
return FALSE;
page = buf_get_get(space, page_no, RW_X_LATCH, mtr);
buf_page_dbg_add_level(page, SYNC_FSP_PAGE);
/*初始化页中所有inode， FSP_SEG_INODES_PER_PAGE = 85，一个inodes page最多包含85个 seg inode对象*/
for(i = 0; i < FSP_SEG_INODES_PER_PAGE; i ++){
inode = fsp_seg_inode_page_get_nth_inode(page, i, mtr);
mlog_write_dulint(inode + FSEG_ID, ut_dulint_zero, MLOG_8BYTES, mtr);
}
/*将页插入到FSP_SEG_INODES_FREE的最后*/
flst_add_last(space_header + FSP_SEG_INODES_FREE, page + FSEG_INODE_PAGE_NODE, mtr);
return TRUE;
}
/*获得一个空闲的segment inode*/
static fseg_inode_t* fsp_alloc_seg_inode(fsp_header_t* space_header, mtr_t* mtr)
{
ulint page_no;
page_t* page;
fseg_inode_t* inode;
ibool success;
ulint n;
/*没有空闲的inode页*/
if(flst_get_len(space_header + FSP_SEG_INODES_FREE, mtr) == 0){
if(fsp_alloc_seg_inode_page(space_header, mtr) == FALSE)
return NULL;
}
page_no = flst_get_first(space_header + FSP_SEG_INODES_FREE, mtr).page;
page = buf_page_get(buf_frame_get_space_id(space_header), page, RW_X_LATCH, mtr);
buf_page_dbg_add_level(page, SYNC_FSP_PAGE);
n = fsp_seg_inode_page_find_free(page, 0, mtr);
ut_a(n != ULINT_UNDEFINED);
/*从可以用的inode page中拿去inode*/
inode = fsp_seg_inode_page_get_nth_inode(page, n, mtr);
if(ULINT32_UNDEFINED == fsp_seg_inode_page_find_free(page, n + 1, mtr)){ /*inode页已经满了*/
flst_remove(space_header + FSP_SEG_INODES_FREE, page + FSEG_INODE_PAGE_NODE, mtr);
flst_add_last(space_header + FSP_SEG_INODES_FULL, page + FSEG_INODE_PAGE_NODE, mtr);
}
return inode;
}
/*释放一个segment inode*/
static void fsp_free_seg_inode(ulint space, fseg_inode_t* inode, mtr_t* mtr)
{
page_t* page;
fsp_header_t* space_header;
page = buf_frame_align(inode);
space_header = fsp_get_space_header(space, mtr);
page = buf_frame_align(inode);
/*魔法字校验*/
ut_ad(mach_read_from_4(inode + FSEG_MAGIC_N) == FSEG_MAGIC_N_VALUE);
if(ULINT_UNDEFINED == fsp_seg_inode_page_find_free(page, 0, mtr)){ /*这个page存在空闲的inode*/
flst_remove(space_header + FSP_SEG_INODES_FULL, page + FSEG_INODE_PAGE_NODE, mtr);
flst_add_last(space_header + FSP_SEG_INODES_FREE, page + FSEG_INODE_PAGE_NODE, mtr);
}
/*重置seg_id和魔法字*/
mlog_write_dulint(inode + FSEG_ID, ut_dulint_zero, MLOG_8BYTES, mtr);
mlog_write_ulint(inode + FSEG_MAGIC_N, 0, MLOG_4BYTES, mtr);
/*这个页中的inode全部空闲，释放对页的占用*/
if(ULINT_UNDEFINED == fsp_seg_inode_page_find_used(page, mtr)){
flst_remove(space_header + FSP_SEG_INODES_FREE, page + FSEG_INODE_PAGE_NODE, mtr);
fsp_free_page(space, buf_frame_get_page_no(page), mtr);
}
}
static fseg_inode_t* fseg_inode_get(fseg_header_t* header, mtr_t* mtr)
{
fil_addr_t inode_addr;
fseg_inode_t* inode;
/*获得当前segment inode的链表fil_addr_t地址*/
inode_addr.page = mach_read_from_4(header + FSEG_HDR_PAGE_NO);
inode_addr.boffset = mach_read_from_2(header + FSEG_HDR_OFFSET);
/*获得对应inode的指针地址*/
inode = fut_get_ptr(mach_read_from_4(header + FSEG_HDR_SPACE), inode_addr, RW_X_LATCH, mtr);
/*魔法字校验*/
ut_ad(mach_read_from_4(inode + FSEG_MAGIC_N) == FSEG_MAGIC_N_VALUE);
return inode;
}
/*获得inode指定位置的page no*/
UNIV_INLINE ulint fseg_get_nth_frag_page_no(fseg_inode_t* inode, ulint n, mtr_t* mtr)
{
ut_ad(inode && mtr);
ut_ad(n < FSEG_FRAG_ARR_N_SLOTS);
ut_ad(mtr_memo_contains(mtr, buf_block_align(inode), MTR_MEMO_PAGE_X_FIX));
return(mach_read_from_4(inode + FSEG_FRAG_ARR + n * FSEG_FRAG_SLOT_SIZE));
}
UNIV_INLINE void fseg_set_nth_frag_page_no(fseg_inode_t* inode, ulint n, ulint page_no, mtr_t* mtr)
{
ut_ad(inode && mtr);
ut_ad(n < FSEG_FRAG_ARR_N_SLOTS);
ut_ad(mtr_memo_contains(mtr, buf_block_align(inode), MTR_MEMO_PAGE_X_FIX));
/*将page no写入到对应的slot位置上*/
mlog_write_ulint(inode + FSEG_FRAG_ARR + n * FSEG_FRAG_SLOT_SIZE, page_no, MLOG_4BYTES, mtr);
}
/*在segment的inode当中获得一个空闲的page的slot*/
static ulint fseg_find_free_frag_page_slot(fseg_inode_t* inode, mtr_t* mtr)
{
ulint i;
ulint page_no;
ut_ad(inode & mtr);
for(i = 0; i < FSEG_FRAG_ARR_N_SLOTS; i ++){
page_no = fseg_get_nth_frag_page_no(inode, i, mtr); /*获得*/
if(page_no == FIL_NULL)
return i;
}
return ULINT_UNDEFINED;
}
/*在inode当中查找最后一个被使用的页的slot*/
static ulint fseg_find_last_used_frag_page_slot(fseg_inode_t* inode, mtr_t* mtr)
{
ulint i;
ulint page_no;
ut_ad(inode && mtr);
/*从后面查找到前面，应该为的是效率问题*/
for(i = 0; i < FSEG_FRAG_ARR_N_SLOTS; i ++){
page_no = fseg_get_nth_frag_page_no(inode, FSEG_FRAG_ARR_N_SLOTS - i -1, mtr);
if(page_no != FIL_NULL)
return FSEG_FRAG_ARR_N_SLOTS - i - 1;
}
return ULINT_UNDEFINED;
}
/*获取inode中已经使用的page数*/