mirror of
https://github.com/MariaDB/server.git
synced 2025-01-19 13:32:33 +01:00
baddc4e91c
innodb-5.1-ss1318 innodb-5.1-ss1330 innodb-5.1-ss1332 innodb-5.1-ss1340 Fixes: - Bug #21409: Incorrect result returned when in READ-COMMITTED with query_cache ON At low transaction isolation levels we let each consistent read set its own snapshot. - Bug #23666: strange Innodb_row_lock_time_% values in show status; also millisecs wrong On Windows ut_usectime returns secs and usecs relative to the UNIX epoch (which is Jan, 1 1970). - Bug #25494: LATEST DEADLOCK INFORMATION is not always cleared lock_deadlock_recursive(): When the search depth or length is exceeded, rewind lock_latest_err_file and display the two transactions at the point of aborting the search. - Bug #25927: Foreign key with ON DELETE SET NULL on NOT NULL can crash server Prevent ALTER TABLE ... MODIFY ... NOT NULL on columns for which there is a foreign key constraint ON ... SET NULL. - Bug #26835: Repeatable corruption of utf8-enabled tables inside InnoDB The bug could be reproduced as follows: Define a table so that the first column of the clustered index is a VARCHAR or a UTF-8 CHAR in a collation where sequences of bytes of differing length are considered equivalent. Insert and delete a record. Before the delete-marked record is purged, insert another record whose first column is of different length but equivalent to the first record. Under certain conditions, the insertion can be incorrectly performed as update-in-place. Likewise, an operation that could be done as update-in-place can unnecessarily be performed as delete and insert, but that would not cause corruption but merely degraded performance.
1879 lines
50 KiB
C
1879 lines
50 KiB
C
/******************************************************
|
|
Transaction undo log
|
|
|
|
(c) 1996 Innobase Oy
|
|
|
|
Created 3/26/1996 Heikki Tuuri
|
|
*******************************************************/
|
|
|
|
#include "trx0undo.h"
|
|
|
|
#ifdef UNIV_NONINL
|
|
#include "trx0undo.ic"
|
|
#endif
|
|
|
|
#include "fsp0fsp.h"
|
|
#include "mach0data.h"
|
|
#include "trx0rseg.h"
|
|
#include "trx0trx.h"
|
|
#include "srv0srv.h"
|
|
#include "trx0rec.h"
|
|
#include "trx0purge.h"
|
|
#include "trx0xa.h"
|
|
|
|
/* How should the old versions in the history list be managed?
|
|
----------------------------------------------------------
|
|
If each transaction is given a whole page for its update undo log, file
|
|
space consumption can be 10 times higher than necessary. Therefore,
|
|
partly filled update undo log pages should be reusable. But then there
|
|
is no way individual pages can be ordered so that the ordering agrees
|
|
with the serialization numbers of the transactions on the pages. Thus,
|
|
the history list must be formed of undo logs, not their header pages as
|
|
it was in the old implementation.
|
|
However, on a single header page the transactions are placed in
|
|
the order of their serialization numbers. As old versions are purged, we
|
|
may free the page when the last transaction on the page has been purged.
|
|
A problem is that the purge has to go through the transactions
|
|
in the serialization order. This means that we have to look through all
|
|
rollback segments for the one that has the smallest transaction number
|
|
in its history list.
|
|
When should we do a purge? A purge is necessary when space is
|
|
running out in any of the rollback segments. Then we may have to purge
|
|
also old version which might be needed by some consistent read. How do
|
|
we trigger the start of a purge? When a transaction writes to an undo log,
|
|
it may notice that the space is running out. When a read view is closed,
|
|
it may make some history superfluous. The server can have an utility which
|
|
periodically checks if it can purge some history.
|
|
In a parallellized purge we have the problem that a query thread
|
|
can remove a delete marked clustered index record before another query
|
|
thread has processed an earlier version of the record, which cannot then
|
|
be done because the row cannot be constructed from the clustered index
|
|
record. To avoid this problem, we will store in the update and delete mark
|
|
undo record also the columns necessary to construct the secondary index
|
|
entries which are modified.
|
|
We can latch the stack of versions of a single clustered index record
|
|
by taking a latch on the clustered index page. As long as the latch is held,
|
|
no new versions can be added and no versions removed by undo. But, a purge
|
|
can still remove old versions from the bottom of the stack. */
|
|
|
|
/* How to protect rollback segments, undo logs, and history lists with
|
|
-------------------------------------------------------------------
|
|
latches?
|
|
-------
|
|
The contention of the kernel mutex should be minimized. When a transaction
|
|
does its first insert or modify in an index, an undo log is assigned for it.
|
|
Then we must have an x-latch to the rollback segment header.
|
|
When the transaction does more modifys or rolls back, the undo log is
|
|
protected with undo_mutex in the transaction.
|
|
When the transaction commits, its insert undo log is either reset and
|
|
cached for a fast reuse, or freed. In these cases we must have an x-latch on
|
|
the rollback segment page. The update undo log is put to the history list. If
|
|
it is not suitable for reuse, its slot in the rollback segment is reset. In
|
|
both cases, an x-latch must be acquired on the rollback segment.
|
|
The purge operation steps through the history list without modifying
|
|
it until a truncate operation occurs, which can remove undo logs from the end
|
|
of the list and release undo log segments. In stepping through the list,
|
|
s-latches on the undo log pages are enough, but in a truncate, x-latches must
|
|
be obtained on the rollback segment and individual pages. */
|
|
|
|
/************************************************************************
|
|
Initializes the fields in an undo log segment page. */
|
|
static
|
|
void
|
|
trx_undo_page_init(
|
|
/*===============*/
|
|
page_t* undo_page, /* in: undo log segment page */
|
|
ulint type, /* in: undo log segment type */
|
|
mtr_t* mtr); /* in: mtr */
|
|
/************************************************************************
|
|
Creates and initializes an undo log memory object. */
|
|
static
|
|
trx_undo_t*
|
|
trx_undo_mem_create(
|
|
/*================*/
|
|
/* out, own: the undo log memory object */
|
|
trx_rseg_t* rseg, /* in: rollback segment memory object */
|
|
ulint id, /* in: slot index within rseg */
|
|
ulint type, /* in: type of the log: TRX_UNDO_INSERT or
|
|
TRX_UNDO_UPDATE */
|
|
dulint trx_id, /* in: id of the trx for which the undo log
|
|
is created */
|
|
XID* xid, /* in: X/Open XA transaction identification*/
|
|
ulint page_no,/* in: undo log header page number */
|
|
ulint offset);/* in: undo log header byte offset on page */
|
|
/*******************************************************************
|
|
Initializes a cached insert undo log header page for new use. NOTE that this
|
|
function has its own log record type MLOG_UNDO_HDR_REUSE. You must NOT change
|
|
the operation of this function! */
|
|
static
|
|
ulint
|
|
trx_undo_insert_header_reuse(
|
|
/*=========================*/
|
|
/* out: undo log header byte offset on page */
|
|
page_t* undo_page, /* in: insert undo log segment header page,
|
|
x-latched */
|
|
dulint trx_id, /* in: transaction id */
|
|
mtr_t* mtr); /* in: mtr */
|
|
/**************************************************************************
|
|
If an update undo log can be discarded immediately, this function frees the
|
|
space, resetting the page to the proper state for caching. */
|
|
static
|
|
void
|
|
trx_undo_discard_latest_update_undo(
|
|
/*================================*/
|
|
page_t* undo_page, /* in: header page of an undo log of size 1 */
|
|
mtr_t* mtr); /* in: mtr */
|
|
|
|
|
|
/***************************************************************************
|
|
Gets the previous record in an undo log from the previous page. */
|
|
static
|
|
trx_undo_rec_t*
|
|
trx_undo_get_prev_rec_from_prev_page(
|
|
/*=================================*/
|
|
/* out: undo log record, the page s-latched,
|
|
NULL if none */
|
|
trx_undo_rec_t* rec, /* in: undo record */
|
|
ulint page_no,/* in: undo log header page number */
|
|
ulint offset, /* in: undo log header offset on page */
|
|
mtr_t* mtr) /* in: mtr */
|
|
{
|
|
ulint prev_page_no;
|
|
page_t* prev_page;
|
|
page_t* undo_page;
|
|
|
|
undo_page = buf_frame_align(rec);
|
|
|
|
prev_page_no = flst_get_prev_addr(undo_page + TRX_UNDO_PAGE_HDR
|
|
+ TRX_UNDO_PAGE_NODE, mtr)
|
|
.page;
|
|
|
|
if (prev_page_no == FIL_NULL) {
|
|
|
|
return(NULL);
|
|
}
|
|
|
|
prev_page = trx_undo_page_get_s_latched(
|
|
buf_frame_get_space_id(undo_page), prev_page_no, mtr);
|
|
|
|
return(trx_undo_page_get_last_rec(prev_page, page_no, offset));
|
|
}
|
|
|
|
/***************************************************************************
|
|
Gets the previous record in an undo log. */
|
|
|
|
trx_undo_rec_t*
|
|
trx_undo_get_prev_rec(
|
|
/*==================*/
|
|
/* out: undo log record, the page s-latched,
|
|
NULL if none */
|
|
trx_undo_rec_t* rec, /* in: undo record */
|
|
ulint page_no,/* in: undo log header page number */
|
|
ulint offset, /* in: undo log header offset on page */
|
|
mtr_t* mtr) /* in: mtr */
|
|
{
|
|
trx_undo_rec_t* prev_rec;
|
|
|
|
prev_rec = trx_undo_page_get_prev_rec(rec, page_no, offset);
|
|
|
|
if (prev_rec) {
|
|
|
|
return(prev_rec);
|
|
}
|
|
|
|
/* We have to go to the previous undo log page to look for the
|
|
previous record */
|
|
|
|
return(trx_undo_get_prev_rec_from_prev_page(rec, page_no, offset,
|
|
mtr));
|
|
}
|
|
|
|
/***************************************************************************
|
|
Gets the next record in an undo log from the next page. */
|
|
static
|
|
trx_undo_rec_t*
|
|
trx_undo_get_next_rec_from_next_page(
|
|
/*=================================*/
|
|
/* out: undo log record, the page latched, NULL if
|
|
none */
|
|
page_t* undo_page, /* in: undo log page */
|
|
ulint page_no,/* in: undo log header page number */
|
|
ulint offset, /* in: undo log header offset on page */
|
|
ulint mode, /* in: latch mode: RW_S_LATCH or RW_X_LATCH */
|
|
mtr_t* mtr) /* in: mtr */
|
|
{
|
|
trx_ulogf_t* log_hdr;
|
|
ulint next_page_no;
|
|
page_t* next_page;
|
|
ulint space;
|
|
ulint next;
|
|
|
|
if (page_no == buf_frame_get_page_no(undo_page)) {
|
|
|
|
log_hdr = undo_page + offset;
|
|
next = mach_read_from_2(log_hdr + TRX_UNDO_NEXT_LOG);
|
|
|
|
if (next != 0) {
|
|
|
|
return(NULL);
|
|
}
|
|
}
|
|
|
|
space = buf_frame_get_space_id(undo_page);
|
|
|
|
next_page_no = flst_get_next_addr(undo_page + TRX_UNDO_PAGE_HDR
|
|
+ TRX_UNDO_PAGE_NODE, mtr)
|
|
.page;
|
|
if (next_page_no == FIL_NULL) {
|
|
|
|
return(NULL);
|
|
}
|
|
|
|
if (mode == RW_S_LATCH) {
|
|
next_page = trx_undo_page_get_s_latched(space, next_page_no,
|
|
mtr);
|
|
} else {
|
|
ut_ad(mode == RW_X_LATCH);
|
|
next_page = trx_undo_page_get(space, next_page_no, mtr);
|
|
}
|
|
|
|
return(trx_undo_page_get_first_rec(next_page, page_no, offset));
|
|
}
|
|
|
|
/***************************************************************************
|
|
Gets the next record in an undo log. */
|
|
|
|
trx_undo_rec_t*
|
|
trx_undo_get_next_rec(
|
|
/*==================*/
|
|
/* out: undo log record, the page s-latched,
|
|
NULL if none */
|
|
trx_undo_rec_t* rec, /* in: undo record */
|
|
ulint page_no,/* in: undo log header page number */
|
|
ulint offset, /* in: undo log header offset on page */
|
|
mtr_t* mtr) /* in: mtr */
|
|
{
|
|
trx_undo_rec_t* next_rec;
|
|
|
|
next_rec = trx_undo_page_get_next_rec(rec, page_no, offset);
|
|
|
|
if (next_rec) {
|
|
return(next_rec);
|
|
}
|
|
|
|
return(trx_undo_get_next_rec_from_next_page(buf_frame_align(rec),
|
|
page_no, offset,
|
|
RW_S_LATCH, mtr));
|
|
}
|
|
|
|
/***************************************************************************
|
|
Gets the first record in an undo log. */
|
|
|
|
trx_undo_rec_t*
|
|
trx_undo_get_first_rec(
|
|
/*===================*/
|
|
/* out: undo log record, the page latched, NULL if
|
|
none */
|
|
ulint space, /* in: undo log header space */
|
|
ulint page_no,/* in: undo log header page number */
|
|
ulint offset, /* in: undo log header offset on page */
|
|
ulint mode, /* in: latching mode: RW_S_LATCH or RW_X_LATCH */
|
|
mtr_t* mtr) /* in: mtr */
|
|
{
|
|
page_t* undo_page;
|
|
trx_undo_rec_t* rec;
|
|
|
|
if (mode == RW_S_LATCH) {
|
|
undo_page = trx_undo_page_get_s_latched(space, page_no, mtr);
|
|
} else {
|
|
undo_page = trx_undo_page_get(space, page_no, mtr);
|
|
}
|
|
|
|
rec = trx_undo_page_get_first_rec(undo_page, page_no, offset);
|
|
|
|
if (rec) {
|
|
return(rec);
|
|
}
|
|
|
|
return(trx_undo_get_next_rec_from_next_page(undo_page, page_no, offset,
|
|
mode, mtr));
|
|
}
|
|
|
|
/*============== UNDO LOG FILE COPY CREATION AND FREEING ==================*/
|
|
|
|
/**************************************************************************
|
|
Writes the mtr log entry of an undo log page initialization. */
|
|
UNIV_INLINE
|
|
void
|
|
trx_undo_page_init_log(
|
|
/*===================*/
|
|
page_t* undo_page, /* in: undo log page */
|
|
ulint type, /* in: undo log type */
|
|
mtr_t* mtr) /* in: mtr */
|
|
{
|
|
mlog_write_initial_log_record(undo_page, MLOG_UNDO_INIT, mtr);
|
|
|
|
mlog_catenate_ulint_compressed(mtr, type);
|
|
}
|
|
|
|
/***************************************************************
|
|
Parses the redo log entry of an undo log page initialization. */
|
|
|
|
byte*
|
|
trx_undo_parse_page_init(
|
|
/*=====================*/
|
|
/* out: end of log record or NULL */
|
|
byte* ptr, /* in: buffer */
|
|
byte* end_ptr,/* in: buffer end */
|
|
page_t* page, /* in: page or NULL */
|
|
mtr_t* mtr) /* in: mtr or NULL */
|
|
{
|
|
ulint type;
|
|
|
|
ptr = mach_parse_compressed(ptr, end_ptr, &type);
|
|
|
|
if (ptr == NULL) {
|
|
|
|
return(NULL);
|
|
}
|
|
|
|
if (page) {
|
|
trx_undo_page_init(page, type, mtr);
|
|
}
|
|
|
|
return(ptr);
|
|
}
|
|
|
|
/************************************************************************
|
|
Initializes the fields in an undo log segment page. */
|
|
static
|
|
void
|
|
trx_undo_page_init(
|
|
/*===============*/
|
|
page_t* undo_page, /* in: undo log segment page */
|
|
ulint type, /* in: undo log segment type */
|
|
mtr_t* mtr) /* in: mtr */
|
|
{
|
|
trx_upagef_t* page_hdr;
|
|
|
|
page_hdr = undo_page + TRX_UNDO_PAGE_HDR;
|
|
|
|
mach_write_to_2(page_hdr + TRX_UNDO_PAGE_TYPE, type);
|
|
|
|
mach_write_to_2(page_hdr + TRX_UNDO_PAGE_START,
|
|
TRX_UNDO_PAGE_HDR + TRX_UNDO_PAGE_HDR_SIZE);
|
|
mach_write_to_2(page_hdr + TRX_UNDO_PAGE_FREE,
|
|
TRX_UNDO_PAGE_HDR + TRX_UNDO_PAGE_HDR_SIZE);
|
|
|
|
fil_page_set_type(undo_page, FIL_PAGE_UNDO_LOG);
|
|
|
|
trx_undo_page_init_log(undo_page, type, mtr);
|
|
}
|
|
|
|
/*******************************************************************
|
|
Creates a new undo log segment in file. */
|
|
static
|
|
page_t*
|
|
trx_undo_seg_create(
|
|
/*================*/
|
|
/* out: segment header page x-latched, NULL
|
|
if no space left */
|
|
trx_rseg_t* rseg __attribute__((unused)),/* in: rollback segment */
|
|
trx_rsegf_t* rseg_hdr,/* in: rollback segment header, page
|
|
x-latched */
|
|
ulint type, /* in: type of the segment: TRX_UNDO_INSERT or
|
|
TRX_UNDO_UPDATE */
|
|
ulint* id, /* out: slot index within rseg header */
|
|
mtr_t* mtr) /* in: mtr */
|
|
{
|
|
ulint slot_no;
|
|
ulint space;
|
|
page_t* undo_page;
|
|
trx_upagef_t* page_hdr;
|
|
trx_usegf_t* seg_hdr;
|
|
ulint n_reserved;
|
|
ibool success;
|
|
|
|
ut_ad(mtr && id && rseg_hdr);
|
|
ut_ad(mutex_own(&(rseg->mutex)));
|
|
|
|
/* fputs(type == TRX_UNDO_INSERT
|
|
? "Creating insert undo log segment\n"
|
|
: "Creating update undo log segment\n", stderr); */
|
|
slot_no = trx_rsegf_undo_find_free(rseg_hdr, mtr);
|
|
|
|
if (slot_no == ULINT_UNDEFINED) {
|
|
ut_print_timestamp(stderr);
|
|
fprintf(stderr,
|
|
"InnoDB: Warning: cannot find a free slot for"
|
|
" an undo log. Do you have too\n"
|
|
"InnoDB: many active transactions"
|
|
" running concurrently?\n");
|
|
|
|
return(NULL);
|
|
}
|
|
|
|
space = buf_frame_get_space_id(rseg_hdr);
|
|
|
|
success = fsp_reserve_free_extents(&n_reserved, space, 2, FSP_UNDO,
|
|
mtr);
|
|
if (!success) {
|
|
|
|
return(NULL);
|
|
}
|
|
|
|
/* Allocate a new file segment for the undo log */
|
|
undo_page = fseg_create_general(space, 0,
|
|
TRX_UNDO_SEG_HDR
|
|
+ TRX_UNDO_FSEG_HEADER, TRUE, mtr);
|
|
|
|
fil_space_release_free_extents(space, n_reserved);
|
|
|
|
if (undo_page == NULL) {
|
|
/* No space left */
|
|
|
|
return(NULL);
|
|
}
|
|
|
|
#ifdef UNIV_SYNC_DEBUG
|
|
buf_page_dbg_add_level(undo_page, SYNC_TRX_UNDO_PAGE);
|
|
#endif /* UNIV_SYNC_DEBUG */
|
|
|
|
page_hdr = undo_page + TRX_UNDO_PAGE_HDR;
|
|
seg_hdr = undo_page + TRX_UNDO_SEG_HDR;
|
|
|
|
trx_undo_page_init(undo_page, type, mtr);
|
|
|
|
mlog_write_ulint(page_hdr + TRX_UNDO_PAGE_FREE,
|
|
TRX_UNDO_SEG_HDR + TRX_UNDO_SEG_HDR_SIZE,
|
|
MLOG_2BYTES, mtr);
|
|
|
|
mlog_write_ulint(seg_hdr + TRX_UNDO_LAST_LOG, 0, MLOG_2BYTES, mtr);
|
|
|
|
flst_init(seg_hdr + TRX_UNDO_PAGE_LIST, mtr);
|
|
|
|
flst_add_last(seg_hdr + TRX_UNDO_PAGE_LIST,
|
|
page_hdr + TRX_UNDO_PAGE_NODE, mtr);
|
|
|
|
trx_rsegf_set_nth_undo(rseg_hdr, slot_no,
|
|
buf_frame_get_page_no(undo_page), mtr);
|
|
*id = slot_no;
|
|
|
|
return(undo_page);
|
|
}
|
|
|
|
/**************************************************************************
|
|
Writes the mtr log entry of an undo log header initialization. */
|
|
UNIV_INLINE
|
|
void
|
|
trx_undo_header_create_log(
|
|
/*=======================*/
|
|
page_t* undo_page, /* in: undo log header page */
|
|
dulint trx_id, /* in: transaction id */
|
|
mtr_t* mtr) /* in: mtr */
|
|
{
|
|
mlog_write_initial_log_record(undo_page, MLOG_UNDO_HDR_CREATE, mtr);
|
|
|
|
mlog_catenate_dulint_compressed(mtr, trx_id);
|
|
}
|
|
|
|
/*******************************************************************
|
|
Creates a new undo log header in file. NOTE that this function has its own
|
|
log record type MLOG_UNDO_HDR_CREATE. You must NOT change the operation of
|
|
this function! */
|
|
static
|
|
ulint
|
|
trx_undo_header_create(
|
|
/*===================*/
|
|
/* out: header byte offset on page */
|
|
page_t* undo_page, /* in: undo log segment header page,
|
|
x-latched; it is assumed that there are
|
|
TRX_UNDO_LOG_XA_HDR_SIZE bytes free space
|
|
on it */
|
|
dulint trx_id, /* in: transaction id */
|
|
mtr_t* mtr) /* in: mtr */
|
|
{
|
|
trx_upagef_t* page_hdr;
|
|
trx_usegf_t* seg_hdr;
|
|
trx_ulogf_t* log_hdr;
|
|
trx_ulogf_t* prev_log_hdr;
|
|
ulint prev_log;
|
|
ulint free;
|
|
ulint new_free;
|
|
|
|
ut_ad(mtr && undo_page);
|
|
|
|
page_hdr = undo_page + TRX_UNDO_PAGE_HDR;
|
|
seg_hdr = undo_page + TRX_UNDO_SEG_HDR;
|
|
|
|
free = mach_read_from_2(page_hdr + TRX_UNDO_PAGE_FREE);
|
|
|
|
log_hdr = undo_page + free;
|
|
|
|
new_free = free + TRX_UNDO_LOG_OLD_HDR_SIZE;
|
|
|
|
ut_a(free + TRX_UNDO_LOG_XA_HDR_SIZE < UNIV_PAGE_SIZE - 100);
|
|
|
|
mach_write_to_2(page_hdr + TRX_UNDO_PAGE_START, new_free);
|
|
|
|
mach_write_to_2(page_hdr + TRX_UNDO_PAGE_FREE, new_free);
|
|
|
|
mach_write_to_2(seg_hdr + TRX_UNDO_STATE, TRX_UNDO_ACTIVE);
|
|
|
|
prev_log = mach_read_from_2(seg_hdr + TRX_UNDO_LAST_LOG);
|
|
|
|
if (prev_log != 0) {
|
|
prev_log_hdr = undo_page + prev_log;
|
|
|
|
mach_write_to_2(prev_log_hdr + TRX_UNDO_NEXT_LOG, free);
|
|
}
|
|
|
|
mach_write_to_2(seg_hdr + TRX_UNDO_LAST_LOG, free);
|
|
|
|
log_hdr = undo_page + free;
|
|
|
|
mach_write_to_2(log_hdr + TRX_UNDO_DEL_MARKS, TRUE);
|
|
|
|
mach_write_to_8(log_hdr + TRX_UNDO_TRX_ID, trx_id);
|
|
mach_write_to_2(log_hdr + TRX_UNDO_LOG_START, new_free);
|
|
|
|
mach_write_to_1(log_hdr + TRX_UNDO_XID_EXISTS, FALSE);
|
|
mach_write_to_1(log_hdr + TRX_UNDO_DICT_TRANS, FALSE);
|
|
|
|
mach_write_to_2(log_hdr + TRX_UNDO_NEXT_LOG, 0);
|
|
mach_write_to_2(log_hdr + TRX_UNDO_PREV_LOG, prev_log);
|
|
|
|
/* Write the log record about the header creation */
|
|
trx_undo_header_create_log(undo_page, trx_id, mtr);
|
|
|
|
return(free);
|
|
}
|
|
|
|
/************************************************************************
|
|
Write X/Open XA Transaction Identification (XID) to undo log header */
|
|
static
|
|
void
|
|
trx_undo_write_xid(
|
|
/*===============*/
|
|
trx_ulogf_t* log_hdr,/* in: undo log header */
|
|
const XID* xid, /* in: X/Open XA Transaction Identification */
|
|
mtr_t* mtr) /* in: mtr */
|
|
{
|
|
mlog_write_ulint(log_hdr + TRX_UNDO_XA_FORMAT,
|
|
(ulint)xid->formatID, MLOG_4BYTES, mtr);
|
|
|
|
mlog_write_ulint(log_hdr + TRX_UNDO_XA_TRID_LEN,
|
|
(ulint)xid->gtrid_length, MLOG_4BYTES, mtr);
|
|
|
|
mlog_write_ulint(log_hdr + TRX_UNDO_XA_BQUAL_LEN,
|
|
(ulint)xid->bqual_length, MLOG_4BYTES, mtr);
|
|
|
|
mlog_write_string(log_hdr + TRX_UNDO_XA_XID, (const byte*) xid->data,
|
|
XIDDATASIZE, mtr);
|
|
}
|
|
|
|
/************************************************************************
|
|
Read X/Open XA Transaction Identification (XID) from undo log header */
|
|
static
|
|
void
|
|
trx_undo_read_xid(
|
|
/*==============*/
|
|
trx_ulogf_t* log_hdr,/* in: undo log header */
|
|
XID* xid) /* out: X/Open XA Transaction Identification */
|
|
{
|
|
xid->formatID = (long)mach_read_from_4(log_hdr + TRX_UNDO_XA_FORMAT);
|
|
|
|
xid->gtrid_length
|
|
= (long) mach_read_from_4(log_hdr + TRX_UNDO_XA_TRID_LEN);
|
|
xid->bqual_length
|
|
= (long) mach_read_from_4(log_hdr + TRX_UNDO_XA_BQUAL_LEN);
|
|
|
|
memcpy(xid->data, log_hdr + TRX_UNDO_XA_XID, XIDDATASIZE);
|
|
}
|
|
|
|
/*******************************************************************
|
|
Adds space for the XA XID after an undo log old-style header. */
|
|
static
|
|
void
|
|
trx_undo_header_add_space_for_xid(
|
|
/*==============================*/
|
|
page_t* undo_page,/* in: undo log segment header page */
|
|
trx_ulogf_t* log_hdr,/* in: undo log header */
|
|
mtr_t* mtr) /* in: mtr */
|
|
{
|
|
trx_upagef_t* page_hdr;
|
|
ulint free;
|
|
ulint new_free;
|
|
|
|
page_hdr = undo_page + TRX_UNDO_PAGE_HDR;
|
|
|
|
free = mach_read_from_2(page_hdr + TRX_UNDO_PAGE_FREE);
|
|
|
|
/* free is now the end offset of the old style undo log header */
|
|
|
|
ut_a(free == (ulint)(log_hdr - undo_page) + TRX_UNDO_LOG_OLD_HDR_SIZE);
|
|
|
|
new_free = free + (TRX_UNDO_LOG_XA_HDR_SIZE
|
|
- TRX_UNDO_LOG_OLD_HDR_SIZE);
|
|
|
|
/* Add space for a XID after the header, update the free offset
|
|
fields on the undo log page and in the undo log header */
|
|
|
|
mlog_write_ulint(page_hdr + TRX_UNDO_PAGE_START, new_free,
|
|
MLOG_2BYTES, mtr);
|
|
|
|
mlog_write_ulint(page_hdr + TRX_UNDO_PAGE_FREE, new_free,
|
|
MLOG_2BYTES, mtr);
|
|
|
|
mlog_write_ulint(log_hdr + TRX_UNDO_LOG_START, new_free,
|
|
MLOG_2BYTES, mtr);
|
|
}
|
|
|
|
/**************************************************************************
|
|
Writes the mtr log entry of an undo log header reuse. */
|
|
UNIV_INLINE
|
|
void
|
|
trx_undo_insert_header_reuse_log(
|
|
/*=============================*/
|
|
page_t* undo_page, /* in: undo log header page */
|
|
dulint trx_id, /* in: transaction id */
|
|
mtr_t* mtr) /* in: mtr */
|
|
{
|
|
mlog_write_initial_log_record(undo_page, MLOG_UNDO_HDR_REUSE, mtr);
|
|
|
|
mlog_catenate_dulint_compressed(mtr, trx_id);
|
|
}
|
|
|
|
/***************************************************************
|
|
Parses the redo log entry of an undo log page header create or reuse. */
|
|
|
|
byte*
|
|
trx_undo_parse_page_header(
|
|
/*=======================*/
|
|
/* out: end of log record or NULL */
|
|
ulint type, /* in: MLOG_UNDO_HDR_CREATE or MLOG_UNDO_HDR_REUSE */
|
|
byte* ptr, /* in: buffer */
|
|
byte* end_ptr,/* in: buffer end */
|
|
page_t* page, /* in: page or NULL */
|
|
mtr_t* mtr) /* in: mtr or NULL */
|
|
{
|
|
dulint trx_id;
|
|
|
|
ptr = mach_dulint_parse_compressed(ptr, end_ptr, &trx_id);
|
|
|
|
if (ptr == NULL) {
|
|
|
|
return(NULL);
|
|
}
|
|
|
|
if (page) {
|
|
if (type == MLOG_UNDO_HDR_CREATE) {
|
|
trx_undo_header_create(page, trx_id, mtr);
|
|
} else {
|
|
ut_ad(type == MLOG_UNDO_HDR_REUSE);
|
|
trx_undo_insert_header_reuse(page, trx_id, mtr);
|
|
}
|
|
}
|
|
|
|
return(ptr);
|
|
}
|
|
|
|
/*******************************************************************
|
|
Initializes a cached insert undo log header page for new use. NOTE that this
|
|
function has its own log record type MLOG_UNDO_HDR_REUSE. You must NOT change
|
|
the operation of this function! */
|
|
static
|
|
ulint
|
|
trx_undo_insert_header_reuse(
|
|
/*=========================*/
|
|
/* out: undo log header byte offset on page */
|
|
page_t* undo_page, /* in: insert undo log segment header page,
|
|
x-latched */
|
|
dulint trx_id, /* in: transaction id */
|
|
mtr_t* mtr) /* in: mtr */
|
|
{
|
|
trx_upagef_t* page_hdr;
|
|
trx_usegf_t* seg_hdr;
|
|
trx_ulogf_t* log_hdr;
|
|
ulint free;
|
|
ulint new_free;
|
|
|
|
ut_ad(mtr && undo_page);
|
|
|
|
page_hdr = undo_page + TRX_UNDO_PAGE_HDR;
|
|
seg_hdr = undo_page + TRX_UNDO_SEG_HDR;
|
|
|
|
free = TRX_UNDO_SEG_HDR + TRX_UNDO_SEG_HDR_SIZE;
|
|
|
|
ut_a(free + TRX_UNDO_LOG_XA_HDR_SIZE < UNIV_PAGE_SIZE - 100);
|
|
|
|
log_hdr = undo_page + free;
|
|
|
|
new_free = free + TRX_UNDO_LOG_OLD_HDR_SIZE;
|
|
|
|
/* Insert undo data is not needed after commit: we may free all
|
|
the space on the page */
|
|
|
|
ut_a(mach_read_from_2(undo_page + TRX_UNDO_PAGE_HDR
|
|
+ TRX_UNDO_PAGE_TYPE)
|
|
== TRX_UNDO_INSERT);
|
|
|
|
mach_write_to_2(page_hdr + TRX_UNDO_PAGE_START, new_free);
|
|
|
|
mach_write_to_2(page_hdr + TRX_UNDO_PAGE_FREE, new_free);
|
|
|
|
mach_write_to_2(seg_hdr + TRX_UNDO_STATE, TRX_UNDO_ACTIVE);
|
|
|
|
log_hdr = undo_page + free;
|
|
|
|
mach_write_to_8(log_hdr + TRX_UNDO_TRX_ID, trx_id);
|
|
mach_write_to_2(log_hdr + TRX_UNDO_LOG_START, new_free);
|
|
|
|
mach_write_to_1(log_hdr + TRX_UNDO_XID_EXISTS, FALSE);
|
|
mach_write_to_1(log_hdr + TRX_UNDO_DICT_TRANS, FALSE);
|
|
|
|
/* Write the log record MLOG_UNDO_HDR_REUSE */
|
|
trx_undo_insert_header_reuse_log(undo_page, trx_id, mtr);
|
|
|
|
return(free);
|
|
}
|
|
|
|
/**************************************************************************
|
|
Writes the redo log entry of an update undo log header discard. */
|
|
UNIV_INLINE
|
|
void
|
|
trx_undo_discard_latest_log(
|
|
/*========================*/
|
|
page_t* undo_page, /* in: undo log header page */
|
|
mtr_t* mtr) /* in: mtr */
|
|
{
|
|
mlog_write_initial_log_record(undo_page, MLOG_UNDO_HDR_DISCARD, mtr);
|
|
}
|
|
|
|
/***************************************************************
|
|
Parses the redo log entry of an undo log page header discard. */
|
|
|
|
byte*
|
|
trx_undo_parse_discard_latest(
|
|
/*==========================*/
|
|
/* out: end of log record or NULL */
|
|
byte* ptr, /* in: buffer */
|
|
byte* end_ptr __attribute__((unused)), /* in: buffer end */
|
|
page_t* page, /* in: page or NULL */
|
|
mtr_t* mtr) /* in: mtr or NULL */
|
|
{
|
|
ut_ad(end_ptr);
|
|
|
|
if (page) {
|
|
trx_undo_discard_latest_update_undo(page, mtr);
|
|
}
|
|
|
|
return(ptr);
|
|
}
|
|
|
|
/**************************************************************************
|
|
If an update undo log can be discarded immediately, this function frees the
|
|
space, resetting the page to the proper state for caching. */
|
|
static
|
|
void
|
|
trx_undo_discard_latest_update_undo(
|
|
/*================================*/
|
|
page_t* undo_page, /* in: header page of an undo log of size 1 */
|
|
mtr_t* mtr) /* in: mtr */
|
|
{
|
|
trx_usegf_t* seg_hdr;
|
|
trx_upagef_t* page_hdr;
|
|
trx_ulogf_t* log_hdr;
|
|
trx_ulogf_t* prev_log_hdr;
|
|
ulint free;
|
|
ulint prev_hdr_offset;
|
|
|
|
seg_hdr = undo_page + TRX_UNDO_SEG_HDR;
|
|
page_hdr = undo_page + TRX_UNDO_PAGE_HDR;
|
|
|
|
free = mach_read_from_2(seg_hdr + TRX_UNDO_LAST_LOG);
|
|
log_hdr = undo_page + free;
|
|
|
|
prev_hdr_offset = mach_read_from_2(log_hdr + TRX_UNDO_PREV_LOG);
|
|
|
|
if (prev_hdr_offset != 0) {
|
|
prev_log_hdr = undo_page + prev_hdr_offset;
|
|
|
|
mach_write_to_2(page_hdr + TRX_UNDO_PAGE_START,
|
|
mach_read_from_2(prev_log_hdr
|
|
+ TRX_UNDO_LOG_START));
|
|
mach_write_to_2(prev_log_hdr + TRX_UNDO_NEXT_LOG, 0);
|
|
}
|
|
|
|
mach_write_to_2(page_hdr + TRX_UNDO_PAGE_FREE, free);
|
|
|
|
mach_write_to_2(seg_hdr + TRX_UNDO_STATE, TRX_UNDO_CACHED);
|
|
mach_write_to_2(seg_hdr + TRX_UNDO_LAST_LOG, prev_hdr_offset);
|
|
|
|
trx_undo_discard_latest_log(undo_page, mtr);
|
|
}
|
|
|
|
/************************************************************************
|
|
Tries to add a page to the undo log segment where the undo log is placed. */
|
|
|
|
ulint
|
|
trx_undo_add_page(
|
|
/*==============*/
|
|
/* out: page number if success, else
|
|
FIL_NULL */
|
|
trx_t* trx, /* in: transaction */
|
|
trx_undo_t* undo, /* in: undo log memory object */
|
|
mtr_t* mtr) /* in: mtr which does not have a latch to any
|
|
undo log page; the caller must have reserved
|
|
the rollback segment mutex */
|
|
{
|
|
page_t* header_page;
|
|
page_t* new_page;
|
|
trx_rseg_t* rseg;
|
|
ulint page_no;
|
|
ulint n_reserved;
|
|
ibool success;
|
|
|
|
ut_ad(mutex_own(&(trx->undo_mutex)));
|
|
ut_ad(!mutex_own(&kernel_mutex));
|
|
ut_ad(mutex_own(&(trx->rseg->mutex)));
|
|
|
|
rseg = trx->rseg;
|
|
|
|
if (rseg->curr_size == rseg->max_size) {
|
|
|
|
return(FIL_NULL);
|
|
}
|
|
|
|
header_page = trx_undo_page_get(undo->space, undo->hdr_page_no, mtr);
|
|
|
|
success = fsp_reserve_free_extents(&n_reserved, undo->space, 1,
|
|
FSP_UNDO, mtr);
|
|
if (!success) {
|
|
|
|
return(FIL_NULL);
|
|
}
|
|
|
|
page_no = fseg_alloc_free_page_general(header_page + TRX_UNDO_SEG_HDR
|
|
+ TRX_UNDO_FSEG_HEADER,
|
|
undo->top_page_no + 1, FSP_UP,
|
|
TRUE, mtr);
|
|
|
|
fil_space_release_free_extents(undo->space, n_reserved);
|
|
|
|
if (page_no == FIL_NULL) {
|
|
|
|
/* No space left */
|
|
|
|
return(FIL_NULL);
|
|
}
|
|
|
|
undo->last_page_no = page_no;
|
|
|
|
new_page = trx_undo_page_get(undo->space, page_no, mtr);
|
|
|
|
trx_undo_page_init(new_page, undo->type, mtr);
|
|
|
|
flst_add_last(header_page + TRX_UNDO_SEG_HDR + TRX_UNDO_PAGE_LIST,
|
|
new_page + TRX_UNDO_PAGE_HDR + TRX_UNDO_PAGE_NODE, mtr);
|
|
undo->size++;
|
|
rseg->curr_size++;
|
|
|
|
return(page_no);
|
|
}
|
|
|
|
/************************************************************************
|
|
Frees an undo log page that is not the header page. */
|
|
static
|
|
ulint
|
|
trx_undo_free_page(
|
|
/*===============*/
|
|
/* out: last page number in remaining log */
|
|
trx_rseg_t* rseg, /* in: rollback segment */
|
|
ibool in_history, /* in: TRUE if the undo log is in the history
|
|
list */
|
|
ulint space, /* in: space */
|
|
ulint hdr_page_no, /* in: header page number */
|
|
ulint page_no, /* in: page number to free: must not be the
|
|
header page */
|
|
mtr_t* mtr) /* in: mtr which does not have a latch to any
|
|
undo log page; the caller must have reserved
|
|
the rollback segment mutex */
|
|
{
|
|
page_t* header_page;
|
|
page_t* undo_page;
|
|
fil_addr_t last_addr;
|
|
trx_rsegf_t* rseg_header;
|
|
ulint hist_size;
|
|
|
|
ut_a(hdr_page_no != page_no);
|
|
ut_ad(!mutex_own(&kernel_mutex));
|
|
ut_ad(mutex_own(&(rseg->mutex)));
|
|
|
|
undo_page = trx_undo_page_get(space, page_no, mtr);
|
|
|
|
header_page = trx_undo_page_get(space, hdr_page_no, mtr);
|
|
|
|
flst_remove(header_page + TRX_UNDO_SEG_HDR + TRX_UNDO_PAGE_LIST,
|
|
undo_page + TRX_UNDO_PAGE_HDR + TRX_UNDO_PAGE_NODE, mtr);
|
|
|
|
fseg_free_page(header_page + TRX_UNDO_SEG_HDR + TRX_UNDO_FSEG_HEADER,
|
|
space, page_no, mtr);
|
|
|
|
last_addr = flst_get_last(header_page + TRX_UNDO_SEG_HDR
|
|
+ TRX_UNDO_PAGE_LIST, mtr);
|
|
rseg->curr_size--;
|
|
|
|
if (in_history) {
|
|
rseg_header = trx_rsegf_get(space, rseg->page_no, mtr);
|
|
|
|
hist_size = mtr_read_ulint(rseg_header + TRX_RSEG_HISTORY_SIZE,
|
|
MLOG_4BYTES, mtr);
|
|
ut_ad(hist_size > 0);
|
|
mlog_write_ulint(rseg_header + TRX_RSEG_HISTORY_SIZE,
|
|
hist_size - 1, MLOG_4BYTES, mtr);
|
|
}
|
|
|
|
return(last_addr.page);
|
|
}
|
|
|
|
/************************************************************************
|
|
Frees an undo log page when there is also the memory object for the undo
|
|
log. */
|
|
static
|
|
void
|
|
trx_undo_free_page_in_rollback(
|
|
/*===========================*/
|
|
trx_t* trx __attribute__((unused)), /* in: transaction */
|
|
trx_undo_t* undo, /* in: undo log memory copy */
|
|
ulint page_no,/* in: page number to free: must not be the
|
|
header page */
|
|
mtr_t* mtr) /* in: mtr which does not have a latch to any
|
|
undo log page; the caller must have reserved
|
|
the rollback segment mutex */
|
|
{
|
|
ulint last_page_no;
|
|
|
|
ut_ad(undo->hdr_page_no != page_no);
|
|
ut_ad(mutex_own(&(trx->undo_mutex)));
|
|
|
|
last_page_no = trx_undo_free_page(undo->rseg, FALSE, undo->space,
|
|
undo->hdr_page_no, page_no, mtr);
|
|
|
|
undo->last_page_no = last_page_no;
|
|
undo->size--;
|
|
}
|
|
|
|
/************************************************************************
|
|
Empties an undo log header page of undo records for that undo log. Other
|
|
undo logs may still have records on that page, if it is an update undo log. */
|
|
static
|
|
void
|
|
trx_undo_empty_header_page(
|
|
/*=======================*/
|
|
ulint space, /* in: space */
|
|
ulint hdr_page_no, /* in: header page number */
|
|
ulint hdr_offset, /* in: header offset */
|
|
mtr_t* mtr) /* in: mtr */
|
|
{
|
|
page_t* header_page;
|
|
trx_ulogf_t* log_hdr;
|
|
ulint end;
|
|
|
|
header_page = trx_undo_page_get(space, hdr_page_no, mtr);
|
|
|
|
log_hdr = header_page + hdr_offset;
|
|
|
|
end = trx_undo_page_get_end(header_page, hdr_page_no, hdr_offset);
|
|
|
|
mlog_write_ulint(log_hdr + TRX_UNDO_LOG_START, end, MLOG_2BYTES, mtr);
|
|
}
|
|
|
|
/***************************************************************************
|
|
Truncates an undo log from the end. This function is used during a rollback
|
|
to free space from an undo log. */
|
|
|
|
void
|
|
trx_undo_truncate_end(
|
|
/*==================*/
|
|
trx_t* trx, /* in: transaction whose undo log it is */
|
|
trx_undo_t* undo, /* in: undo log */
|
|
dulint limit) /* in: all undo records with undo number
|
|
>= this value should be truncated */
|
|
{
|
|
page_t* undo_page;
|
|
ulint last_page_no;
|
|
trx_undo_rec_t* rec;
|
|
trx_undo_rec_t* trunc_here;
|
|
trx_rseg_t* rseg;
|
|
mtr_t mtr;
|
|
|
|
ut_ad(mutex_own(&(trx->undo_mutex)));
|
|
ut_ad(mutex_own(&(trx->rseg->mutex)));
|
|
|
|
rseg = trx->rseg;
|
|
|
|
for (;;) {
|
|
mtr_start(&mtr);
|
|
|
|
trunc_here = NULL;
|
|
|
|
last_page_no = undo->last_page_no;
|
|
|
|
undo_page = trx_undo_page_get(undo->space, last_page_no, &mtr);
|
|
|
|
rec = trx_undo_page_get_last_rec(undo_page, undo->hdr_page_no,
|
|
undo->hdr_offset);
|
|
for (;;) {
|
|
if (rec == NULL) {
|
|
if (last_page_no == undo->hdr_page_no) {
|
|
|
|
goto function_exit;
|
|
}
|
|
|
|
trx_undo_free_page_in_rollback(
|
|
trx, undo, last_page_no, &mtr);
|
|
break;
|
|
}
|
|
|
|
if (ut_dulint_cmp(trx_undo_rec_get_undo_no(rec), limit)
|
|
>= 0) {
|
|
/* Truncate at least this record off, maybe
|
|
more */
|
|
trunc_here = rec;
|
|
} else {
|
|
goto function_exit;
|
|
}
|
|
|
|
rec = trx_undo_page_get_prev_rec(rec,
|
|
undo->hdr_page_no,
|
|
undo->hdr_offset);
|
|
}
|
|
|
|
mtr_commit(&mtr);
|
|
}
|
|
|
|
function_exit:
|
|
if (trunc_here) {
|
|
mlog_write_ulint(undo_page + TRX_UNDO_PAGE_HDR
|
|
+ TRX_UNDO_PAGE_FREE,
|
|
trunc_here - undo_page, MLOG_2BYTES, &mtr);
|
|
}
|
|
|
|
mtr_commit(&mtr);
|
|
}
|
|
|
|
/***************************************************************************
|
|
Truncates an undo log from the start. This function is used during a purge
|
|
operation. */
|
|
|
|
void
|
|
trx_undo_truncate_start(
|
|
/*====================*/
|
|
trx_rseg_t* rseg, /* in: rollback segment */
|
|
ulint space, /* in: space id of the log */
|
|
ulint hdr_page_no, /* in: header page number */
|
|
ulint hdr_offset, /* in: header offset on the page */
|
|
dulint limit) /* in: all undo pages with undo numbers <
|
|
this value should be truncated; NOTE that
|
|
the function only frees whole pages; the
|
|
header page is not freed, but emptied, if
|
|
all the records there are < limit */
|
|
{
|
|
page_t* undo_page;
|
|
trx_undo_rec_t* rec;
|
|
trx_undo_rec_t* last_rec;
|
|
ulint page_no;
|
|
mtr_t mtr;
|
|
|
|
ut_ad(mutex_own(&(rseg->mutex)));
|
|
|
|
if (0 == ut_dulint_cmp(limit, ut_dulint_zero)) {
|
|
|
|
return;
|
|
}
|
|
loop:
|
|
mtr_start(&mtr);
|
|
|
|
rec = trx_undo_get_first_rec(space, hdr_page_no, hdr_offset,
|
|
RW_X_LATCH, &mtr);
|
|
if (rec == NULL) {
|
|
/* Already empty */
|
|
|
|
mtr_commit(&mtr);
|
|
|
|
return;
|
|
}
|
|
|
|
undo_page = buf_frame_align(rec);
|
|
|
|
last_rec = trx_undo_page_get_last_rec(undo_page, hdr_page_no,
|
|
hdr_offset);
|
|
if (ut_dulint_cmp(trx_undo_rec_get_undo_no(last_rec), limit) >= 0) {
|
|
|
|
mtr_commit(&mtr);
|
|
|
|
return;
|
|
}
|
|
|
|
page_no = buf_frame_get_page_no(undo_page);
|
|
|
|
if (page_no == hdr_page_no) {
|
|
trx_undo_empty_header_page(space, hdr_page_no, hdr_offset,
|
|
&mtr);
|
|
} else {
|
|
trx_undo_free_page(rseg, TRUE, space, hdr_page_no,
|
|
page_no, &mtr);
|
|
}
|
|
|
|
mtr_commit(&mtr);
|
|
|
|
goto loop;
|
|
}
|
|
|
|
/**************************************************************************
|
|
Frees an undo log segment which is not in the history list. */
|
|
static
|
|
void
|
|
trx_undo_seg_free(
|
|
/*==============*/
|
|
trx_undo_t* undo) /* in: undo log */
|
|
{
|
|
trx_rseg_t* rseg;
|
|
fseg_header_t* file_seg;
|
|
trx_rsegf_t* rseg_header;
|
|
trx_usegf_t* seg_header;
|
|
ibool finished;
|
|
mtr_t mtr;
|
|
|
|
finished = FALSE;
|
|
rseg = undo->rseg;
|
|
|
|
while (!finished) {
|
|
|
|
mtr_start(&mtr);
|
|
|
|
ut_ad(!mutex_own(&kernel_mutex));
|
|
|
|
mutex_enter(&(rseg->mutex));
|
|
|
|
seg_header = trx_undo_page_get(undo->space, undo->hdr_page_no,
|
|
&mtr) + TRX_UNDO_SEG_HDR;
|
|
|
|
file_seg = seg_header + TRX_UNDO_FSEG_HEADER;
|
|
|
|
finished = fseg_free_step(file_seg, &mtr);
|
|
|
|
if (finished) {
|
|
/* Update the rseg header */
|
|
rseg_header = trx_rsegf_get(rseg->space, rseg->page_no,
|
|
&mtr);
|
|
trx_rsegf_set_nth_undo(rseg_header, undo->id, FIL_NULL,
|
|
&mtr);
|
|
}
|
|
|
|
mutex_exit(&(rseg->mutex));
|
|
mtr_commit(&mtr);
|
|
}
|
|
}
|
|
|
|
/*========== UNDO LOG MEMORY COPY INITIALIZATION =====================*/
|
|
|
|
/************************************************************************
|
|
Creates and initializes an undo log memory object according to the values
|
|
in the header in file, when the database is started. The memory object is
|
|
inserted in the appropriate list of rseg. */
|
|
static
|
|
trx_undo_t*
|
|
trx_undo_mem_create_at_db_start(
|
|
/*============================*/
|
|
/* out, own: the undo log memory object */
|
|
trx_rseg_t* rseg, /* in: rollback segment memory object */
|
|
ulint id, /* in: slot index within rseg */
|
|
ulint page_no,/* in: undo log segment page number */
|
|
mtr_t* mtr) /* in: mtr */
|
|
{
|
|
page_t* undo_page;
|
|
trx_upagef_t* page_header;
|
|
trx_usegf_t* seg_header;
|
|
trx_ulogf_t* undo_header;
|
|
trx_undo_t* undo;
|
|
ulint type;
|
|
ulint state;
|
|
dulint trx_id;
|
|
ulint offset;
|
|
fil_addr_t last_addr;
|
|
page_t* last_page;
|
|
trx_undo_rec_t* rec;
|
|
XID xid;
|
|
ibool xid_exists = FALSE;
|
|
|
|
if (id >= TRX_RSEG_N_SLOTS) {
|
|
fprintf(stderr,
|
|
"InnoDB: Error: undo->id is %lu\n", (ulong) id);
|
|
ut_error;
|
|
}
|
|
|
|
undo_page = trx_undo_page_get(rseg->space, page_no, mtr);
|
|
|
|
page_header = undo_page + TRX_UNDO_PAGE_HDR;
|
|
|
|
type = mtr_read_ulint(page_header + TRX_UNDO_PAGE_TYPE, MLOG_2BYTES,
|
|
mtr);
|
|
seg_header = undo_page + TRX_UNDO_SEG_HDR;
|
|
|
|
state = mach_read_from_2(seg_header + TRX_UNDO_STATE);
|
|
|
|
offset = mach_read_from_2(seg_header + TRX_UNDO_LAST_LOG);
|
|
|
|
undo_header = undo_page + offset;
|
|
|
|
trx_id = mtr_read_dulint(undo_header + TRX_UNDO_TRX_ID, mtr);
|
|
|
|
xid_exists = mtr_read_ulint(undo_header + TRX_UNDO_XID_EXISTS,
|
|
MLOG_1BYTE, mtr);
|
|
|
|
/* Read X/Open XA transaction identification if it exists, or
|
|
set it to NULL. */
|
|
|
|
memset(&xid, 0, sizeof(xid));
|
|
xid.formatID = -1;
|
|
|
|
if (xid_exists == TRUE) {
|
|
trx_undo_read_xid(undo_header, &xid);
|
|
}
|
|
|
|
mutex_enter(&(rseg->mutex));
|
|
|
|
undo = trx_undo_mem_create(rseg, id, type, trx_id, &xid,
|
|
page_no, offset);
|
|
mutex_exit(&(rseg->mutex));
|
|
|
|
undo->dict_operation = mtr_read_ulint(
|
|
undo_header + TRX_UNDO_DICT_TRANS, MLOG_1BYTE, mtr);
|
|
|
|
undo->table_id = mtr_read_dulint(undo_header + TRX_UNDO_TABLE_ID, mtr);
|
|
undo->state = state;
|
|
undo->size = flst_get_len(seg_header + TRX_UNDO_PAGE_LIST, mtr);
|
|
|
|
/* If the log segment is being freed, the page list is inconsistent! */
|
|
if (state == TRX_UNDO_TO_FREE) {
|
|
|
|
goto add_to_list;
|
|
}
|
|
|
|
last_addr = flst_get_last(seg_header + TRX_UNDO_PAGE_LIST, mtr);
|
|
|
|
undo->last_page_no = last_addr.page;
|
|
undo->top_page_no = last_addr.page;
|
|
|
|
last_page = trx_undo_page_get(rseg->space, undo->last_page_no, mtr);
|
|
|
|
rec = trx_undo_page_get_last_rec(last_page, page_no, offset);
|
|
|
|
if (rec == NULL) {
|
|
undo->empty = TRUE;
|
|
} else {
|
|
undo->empty = FALSE;
|
|
undo->top_offset = rec - last_page;
|
|
undo->top_undo_no = trx_undo_rec_get_undo_no(rec);
|
|
}
|
|
add_to_list:
|
|
if (type == TRX_UNDO_INSERT) {
|
|
if (state != TRX_UNDO_CACHED) {
|
|
UT_LIST_ADD_LAST(undo_list, rseg->insert_undo_list,
|
|
undo);
|
|
} else {
|
|
UT_LIST_ADD_LAST(undo_list, rseg->insert_undo_cached,
|
|
undo);
|
|
}
|
|
} else {
|
|
ut_ad(type == TRX_UNDO_UPDATE);
|
|
if (state != TRX_UNDO_CACHED) {
|
|
UT_LIST_ADD_LAST(undo_list, rseg->update_undo_list,
|
|
undo);
|
|
} else {
|
|
UT_LIST_ADD_LAST(undo_list, rseg->update_undo_cached,
|
|
undo);
|
|
}
|
|
}
|
|
|
|
return(undo);
|
|
}
|
|
|
|
/************************************************************************
|
|
Initializes the undo log lists for a rollback segment memory copy. This
|
|
function is only called when the database is started or a new rollback
|
|
segment is created. */
|
|
|
|
ulint
|
|
trx_undo_lists_init(
|
|
/*================*/
|
|
/* out: the combined size of undo log segments
|
|
in pages */
|
|
trx_rseg_t* rseg) /* in: rollback segment memory object */
|
|
{
|
|
ulint page_no;
|
|
trx_undo_t* undo;
|
|
ulint size = 0;
|
|
trx_rsegf_t* rseg_header;
|
|
ulint i;
|
|
mtr_t mtr;
|
|
|
|
UT_LIST_INIT(rseg->update_undo_list);
|
|
UT_LIST_INIT(rseg->update_undo_cached);
|
|
UT_LIST_INIT(rseg->insert_undo_list);
|
|
UT_LIST_INIT(rseg->insert_undo_cached);
|
|
|
|
mtr_start(&mtr);
|
|
|
|
rseg_header = trx_rsegf_get_new(rseg->space, rseg->page_no, &mtr);
|
|
|
|
for (i = 0; i < TRX_RSEG_N_SLOTS; i++) {
|
|
page_no = trx_rsegf_get_nth_undo(rseg_header, i, &mtr);
|
|
|
|
/* In forced recovery: try to avoid operations which look
|
|
at database pages; undo logs are rapidly changing data, and
|
|
the probability that they are in an inconsistent state is
|
|
high */
|
|
|
|
if (page_no != FIL_NULL
|
|
&& srv_force_recovery < SRV_FORCE_NO_UNDO_LOG_SCAN) {
|
|
|
|
undo = trx_undo_mem_create_at_db_start(rseg, i,
|
|
page_no, &mtr);
|
|
size += undo->size;
|
|
|
|
mtr_commit(&mtr);
|
|
|
|
mtr_start(&mtr);
|
|
|
|
rseg_header = trx_rsegf_get(rseg->space,
|
|
rseg->page_no, &mtr);
|
|
}
|
|
}
|
|
|
|
mtr_commit(&mtr);
|
|
|
|
return(size);
|
|
}
|
|
|
|
/************************************************************************
|
|
Creates and initializes an undo log memory object. */
|
|
static
|
|
trx_undo_t*
|
|
trx_undo_mem_create(
|
|
/*================*/
|
|
/* out, own: the undo log memory object */
|
|
trx_rseg_t* rseg, /* in: rollback segment memory object */
|
|
ulint id, /* in: slot index within rseg */
|
|
ulint type, /* in: type of the log: TRX_UNDO_INSERT or
|
|
TRX_UNDO_UPDATE */
|
|
dulint trx_id, /* in: id of the trx for which the undo log
|
|
is created */
|
|
XID* xid, /* in: X/Open transaction identification */
|
|
ulint page_no,/* in: undo log header page number */
|
|
ulint offset) /* in: undo log header byte offset on page */
|
|
{
|
|
trx_undo_t* undo;
|
|
|
|
ut_ad(mutex_own(&(rseg->mutex)));
|
|
|
|
if (id >= TRX_RSEG_N_SLOTS) {
|
|
fprintf(stderr,
|
|
"InnoDB: Error: undo->id is %lu\n", (ulong) id);
|
|
ut_error;
|
|
}
|
|
|
|
undo = mem_alloc(sizeof(trx_undo_t));
|
|
|
|
undo->id = id;
|
|
undo->type = type;
|
|
undo->state = TRX_UNDO_ACTIVE;
|
|
undo->del_marks = FALSE;
|
|
undo->trx_id = trx_id;
|
|
undo->xid = *xid;
|
|
|
|
undo->dict_operation = FALSE;
|
|
|
|
undo->rseg = rseg;
|
|
|
|
undo->space = rseg->space;
|
|
undo->hdr_page_no = page_no;
|
|
undo->hdr_offset = offset;
|
|
undo->last_page_no = page_no;
|
|
undo->size = 1;
|
|
|
|
undo->empty = TRUE;
|
|
undo->top_page_no = page_no;
|
|
undo->guess_page = NULL;
|
|
|
|
return(undo);
|
|
}
|
|
|
|
/************************************************************************
|
|
Initializes a cached undo log object for new use. */
|
|
static
|
|
void
|
|
trx_undo_mem_init_for_reuse(
|
|
/*========================*/
|
|
trx_undo_t* undo, /* in: undo log to init */
|
|
dulint trx_id, /* in: id of the trx for which the undo log
|
|
is created */
|
|
XID* xid, /* in: X/Open XA transaction identification*/
|
|
ulint offset) /* in: undo log header byte offset on page */
|
|
{
|
|
ut_ad(mutex_own(&((undo->rseg)->mutex)));
|
|
|
|
if (UNIV_UNLIKELY(undo->id >= TRX_RSEG_N_SLOTS)) {
|
|
fprintf(stderr, "InnoDB: Error: undo->id is %lu\n",
|
|
(ulong) undo->id);
|
|
|
|
mem_analyze_corruption(undo);
|
|
ut_error;
|
|
}
|
|
|
|
undo->state = TRX_UNDO_ACTIVE;
|
|
undo->del_marks = FALSE;
|
|
undo->trx_id = trx_id;
|
|
undo->xid = *xid;
|
|
|
|
undo->dict_operation = FALSE;
|
|
|
|
undo->hdr_offset = offset;
|
|
undo->empty = TRUE;
|
|
}
|
|
|
|
/************************************************************************
|
|
Frees an undo log memory copy. */
|
|
static
|
|
void
|
|
trx_undo_mem_free(
|
|
/*==============*/
|
|
trx_undo_t* undo) /* in: the undo object to be freed */
|
|
{
|
|
if (undo->id >= TRX_RSEG_N_SLOTS) {
|
|
fprintf(stderr,
|
|
"InnoDB: Error: undo->id is %lu\n", (ulong) undo->id);
|
|
ut_error;
|
|
}
|
|
|
|
mem_free(undo);
|
|
}
|
|
|
|
/**************************************************************************
|
|
Creates a new undo log. */
|
|
static
|
|
trx_undo_t*
|
|
trx_undo_create(
|
|
/*============*/
|
|
/* out: undo log object, NULL if did not
|
|
succeed: out of space */
|
|
trx_t* trx, /* in: transaction */
|
|
trx_rseg_t* rseg, /* in: rollback segment memory copy */
|
|
ulint type, /* in: type of the log: TRX_UNDO_INSERT or
|
|
TRX_UNDO_UPDATE */
|
|
dulint trx_id, /* in: id of the trx for which the undo log
|
|
is created */
|
|
XID* xid, /* in: X/Open transaction identification*/
|
|
mtr_t* mtr) /* in: mtr */
|
|
{
|
|
trx_rsegf_t* rseg_header;
|
|
ulint page_no;
|
|
ulint offset;
|
|
ulint id;
|
|
trx_undo_t* undo;
|
|
page_t* undo_page;
|
|
|
|
ut_ad(mutex_own(&(rseg->mutex)));
|
|
|
|
if (rseg->curr_size == rseg->max_size) {
|
|
|
|
return(NULL);
|
|
}
|
|
|
|
rseg->curr_size++;
|
|
|
|
rseg_header = trx_rsegf_get(rseg->space, rseg->page_no, mtr);
|
|
|
|
undo_page = trx_undo_seg_create(rseg, rseg_header, type, &id, mtr);
|
|
|
|
if (undo_page == NULL) {
|
|
/* Did not succeed */
|
|
|
|
rseg->curr_size--;
|
|
|
|
return(NULL);
|
|
}
|
|
|
|
page_no = buf_frame_get_page_no(undo_page);
|
|
|
|
offset = trx_undo_header_create(undo_page, trx_id, mtr);
|
|
|
|
if (trx->support_xa) {
|
|
trx_undo_header_add_space_for_xid(undo_page,
|
|
undo_page + offset, mtr);
|
|
}
|
|
|
|
undo = trx_undo_mem_create(rseg, id, type, trx_id, xid,
|
|
page_no, offset);
|
|
return(undo);
|
|
}
|
|
|
|
/*================ UNDO LOG ASSIGNMENT AND CLEANUP =====================*/
|
|
|
|
/************************************************************************
|
|
Reuses a cached undo log. */
|
|
static
|
|
trx_undo_t*
|
|
trx_undo_reuse_cached(
|
|
/*==================*/
|
|
/* out: the undo log memory object, NULL if
|
|
none cached */
|
|
trx_t* trx, /* in: transaction */
|
|
trx_rseg_t* rseg, /* in: rollback segment memory object */
|
|
ulint type, /* in: type of the log: TRX_UNDO_INSERT or
|
|
TRX_UNDO_UPDATE */
|
|
dulint trx_id, /* in: id of the trx for which the undo log
|
|
is used */
|
|
XID* xid, /* in: X/Open XA transaction identification */
|
|
mtr_t* mtr) /* in: mtr */
|
|
{
|
|
trx_undo_t* undo;
|
|
page_t* undo_page;
|
|
ulint offset;
|
|
|
|
ut_ad(mutex_own(&(rseg->mutex)));
|
|
|
|
if (type == TRX_UNDO_INSERT) {
|
|
|
|
undo = UT_LIST_GET_FIRST(rseg->insert_undo_cached);
|
|
if (undo == NULL) {
|
|
|
|
return(NULL);
|
|
}
|
|
|
|
UT_LIST_REMOVE(undo_list, rseg->insert_undo_cached, undo);
|
|
} else {
|
|
ut_ad(type == TRX_UNDO_UPDATE);
|
|
|
|
undo = UT_LIST_GET_FIRST(rseg->update_undo_cached);
|
|
if (undo == NULL) {
|
|
|
|
return(NULL);
|
|
}
|
|
|
|
UT_LIST_REMOVE(undo_list, rseg->update_undo_cached, undo);
|
|
}
|
|
|
|
ut_ad(undo->size == 1);
|
|
|
|
if (undo->id >= TRX_RSEG_N_SLOTS) {
|
|
fprintf(stderr, "InnoDB: Error: undo->id is %lu\n",
|
|
(ulong) undo->id);
|
|
mem_analyze_corruption(undo);
|
|
ut_error;
|
|
}
|
|
|
|
undo_page = trx_undo_page_get(undo->space, undo->hdr_page_no, mtr);
|
|
|
|
if (type == TRX_UNDO_INSERT) {
|
|
offset = trx_undo_insert_header_reuse(undo_page, trx_id, mtr);
|
|
|
|
if (trx->support_xa) {
|
|
trx_undo_header_add_space_for_xid(
|
|
undo_page, undo_page + offset, mtr);
|
|
}
|
|
} else {
|
|
ut_a(mach_read_from_2(undo_page + TRX_UNDO_PAGE_HDR
|
|
+ TRX_UNDO_PAGE_TYPE)
|
|
== TRX_UNDO_UPDATE);
|
|
|
|
offset = trx_undo_header_create(undo_page, trx_id, mtr);
|
|
|
|
if (trx->support_xa) {
|
|
trx_undo_header_add_space_for_xid(
|
|
undo_page, undo_page + offset, mtr);
|
|
}
|
|
}
|
|
|
|
trx_undo_mem_init_for_reuse(undo, trx_id, xid, offset);
|
|
|
|
return(undo);
|
|
}
|
|
|
|
/**************************************************************************
|
|
Marks an undo log header as a header of a data dictionary operation
|
|
transaction. */
|
|
static
|
|
void
|
|
trx_undo_mark_as_dict_operation(
|
|
/*============================*/
|
|
trx_t* trx, /* in: dict op transaction */
|
|
trx_undo_t* undo, /* in: assigned undo log */
|
|
mtr_t* mtr) /* in: mtr */
|
|
{
|
|
page_t* hdr_page;
|
|
|
|
ut_a(trx->dict_operation);
|
|
|
|
hdr_page = trx_undo_page_get(undo->space, undo->hdr_page_no, mtr);
|
|
|
|
mlog_write_ulint(hdr_page + undo->hdr_offset
|
|
+ TRX_UNDO_DICT_TRANS,
|
|
trx->dict_operation, MLOG_1BYTE, mtr);
|
|
|
|
mlog_write_dulint(hdr_page + undo->hdr_offset + TRX_UNDO_TABLE_ID,
|
|
trx->table_id, mtr);
|
|
|
|
undo->dict_operation = trx->dict_operation;
|
|
undo->table_id = trx->table_id;
|
|
}
|
|
|
|
/**************************************************************************
|
|
Assigns an undo log for a transaction. A new undo log is created or a cached
|
|
undo log reused. */
|
|
|
|
trx_undo_t*
|
|
trx_undo_assign_undo(
|
|
/*=================*/
|
|
/* out: the undo log, NULL if did not succeed: out of
|
|
space */
|
|
trx_t* trx, /* in: transaction */
|
|
ulint type) /* in: TRX_UNDO_INSERT or TRX_UNDO_UPDATE */
|
|
{
|
|
trx_rseg_t* rseg;
|
|
trx_undo_t* undo;
|
|
mtr_t mtr;
|
|
|
|
ut_ad(trx);
|
|
ut_ad(trx->rseg);
|
|
|
|
rseg = trx->rseg;
|
|
|
|
ut_ad(mutex_own(&(trx->undo_mutex)));
|
|
|
|
mtr_start(&mtr);
|
|
|
|
ut_ad(!mutex_own(&kernel_mutex));
|
|
|
|
mutex_enter(&(rseg->mutex));
|
|
|
|
undo = trx_undo_reuse_cached(trx, rseg, type, trx->id, &trx->xid,
|
|
&mtr);
|
|
if (undo == NULL) {
|
|
undo = trx_undo_create(trx, rseg, type, trx->id, &trx->xid,
|
|
&mtr);
|
|
if (undo == NULL) {
|
|
/* Did not succeed */
|
|
|
|
mutex_exit(&(rseg->mutex));
|
|
mtr_commit(&mtr);
|
|
|
|
return(NULL);
|
|
}
|
|
}
|
|
|
|
if (type == TRX_UNDO_INSERT) {
|
|
UT_LIST_ADD_FIRST(undo_list, rseg->insert_undo_list, undo);
|
|
ut_ad(trx->insert_undo == NULL);
|
|
trx->insert_undo = undo;
|
|
} else {
|
|
UT_LIST_ADD_FIRST(undo_list, rseg->update_undo_list, undo);
|
|
ut_ad(trx->update_undo == NULL);
|
|
trx->update_undo = undo;
|
|
}
|
|
|
|
if (trx->dict_operation) {
|
|
trx_undo_mark_as_dict_operation(trx, undo, &mtr);
|
|
}
|
|
|
|
mutex_exit(&(rseg->mutex));
|
|
mtr_commit(&mtr);
|
|
|
|
return(undo);
|
|
}
|
|
|
|
/**********************************************************************
|
|
Sets the state of the undo log segment at a transaction finish. */
|
|
|
|
page_t*
|
|
trx_undo_set_state_at_finish(
|
|
/*=========================*/
|
|
/* out: undo log segment header page,
|
|
x-latched */
|
|
trx_t* trx __attribute__((unused)), /* in: transaction */
|
|
trx_undo_t* undo, /* in: undo log memory copy */
|
|
mtr_t* mtr) /* in: mtr */
|
|
{
|
|
trx_usegf_t* seg_hdr;
|
|
trx_upagef_t* page_hdr;
|
|
page_t* undo_page;
|
|
ulint state;
|
|
|
|
ut_ad(trx && undo && mtr);
|
|
|
|
if (undo->id >= TRX_RSEG_N_SLOTS) {
|
|
fprintf(stderr, "InnoDB: Error: undo->id is %lu\n",
|
|
(ulong) undo->id);
|
|
mem_analyze_corruption(undo);
|
|
ut_error;
|
|
}
|
|
|
|
undo_page = trx_undo_page_get(undo->space, undo->hdr_page_no, mtr);
|
|
|
|
seg_hdr = undo_page + TRX_UNDO_SEG_HDR;
|
|
page_hdr = undo_page + TRX_UNDO_PAGE_HDR;
|
|
|
|
if (undo->size == 1 && mach_read_from_2(page_hdr + TRX_UNDO_PAGE_FREE)
|
|
< TRX_UNDO_PAGE_REUSE_LIMIT) {
|
|
state = TRX_UNDO_CACHED;
|
|
|
|
} else if (undo->type == TRX_UNDO_INSERT) {
|
|
|
|
state = TRX_UNDO_TO_FREE;
|
|
} else {
|
|
state = TRX_UNDO_TO_PURGE;
|
|
}
|
|
|
|
undo->state = state;
|
|
|
|
mlog_write_ulint(seg_hdr + TRX_UNDO_STATE, state, MLOG_2BYTES, mtr);
|
|
|
|
return(undo_page);
|
|
}
|
|
|
|
/**********************************************************************
|
|
Sets the state of the undo log segment at a transaction prepare. */
|
|
|
|
page_t*
|
|
trx_undo_set_state_at_prepare(
|
|
/*==========================*/
|
|
/* out: undo log segment header page,
|
|
x-latched */
|
|
trx_t* trx, /* in: transaction */
|
|
trx_undo_t* undo, /* in: undo log memory copy */
|
|
mtr_t* mtr) /* in: mtr */
|
|
{
|
|
trx_usegf_t* seg_hdr;
|
|
trx_upagef_t* page_hdr;
|
|
trx_ulogf_t* undo_header;
|
|
page_t* undo_page;
|
|
ulint offset;
|
|
|
|
ut_ad(trx && undo && mtr);
|
|
|
|
if (undo->id >= TRX_RSEG_N_SLOTS) {
|
|
fprintf(stderr, "InnoDB: Error: undo->id is %lu\n",
|
|
(ulong) undo->id);
|
|
mem_analyze_corruption(undo);
|
|
ut_error;
|
|
}
|
|
|
|
undo_page = trx_undo_page_get(undo->space, undo->hdr_page_no, mtr);
|
|
|
|
seg_hdr = undo_page + TRX_UNDO_SEG_HDR;
|
|
page_hdr = undo_page + TRX_UNDO_PAGE_HDR;
|
|
|
|
/*------------------------------*/
|
|
undo->state = TRX_UNDO_PREPARED;
|
|
undo->xid = trx->xid;
|
|
/*------------------------------*/
|
|
|
|
mlog_write_ulint(seg_hdr + TRX_UNDO_STATE, undo->state,
|
|
MLOG_2BYTES, mtr);
|
|
|
|
offset = mach_read_from_2(seg_hdr + TRX_UNDO_LAST_LOG);
|
|
undo_header = undo_page + offset;
|
|
|
|
mlog_write_ulint(undo_header + TRX_UNDO_XID_EXISTS,
|
|
TRUE, MLOG_1BYTE, mtr);
|
|
|
|
trx_undo_write_xid(undo_header, &undo->xid, mtr);
|
|
|
|
return(undo_page);
|
|
}
|
|
|
|
/**************************************************************************
|
|
Adds the update undo log header as the first in the history list, and
|
|
frees the memory object, or puts it to the list of cached update undo log
|
|
segments. */
|
|
|
|
void
|
|
trx_undo_update_cleanup(
|
|
/*====================*/
|
|
trx_t* trx, /* in: trx owning the update undo log */
|
|
page_t* undo_page, /* in: update undo log header page,
|
|
x-latched */
|
|
mtr_t* mtr) /* in: mtr */
|
|
{
|
|
trx_rseg_t* rseg;
|
|
trx_undo_t* undo;
|
|
|
|
undo = trx->update_undo;
|
|
rseg = trx->rseg;
|
|
|
|
ut_ad(mutex_own(&(rseg->mutex)));
|
|
|
|
trx_purge_add_update_undo_to_history(trx, undo_page, mtr);
|
|
|
|
UT_LIST_REMOVE(undo_list, rseg->update_undo_list, undo);
|
|
|
|
trx->update_undo = NULL;
|
|
|
|
if (undo->state == TRX_UNDO_CACHED) {
|
|
|
|
UT_LIST_ADD_FIRST(undo_list, rseg->update_undo_cached, undo);
|
|
} else {
|
|
ut_ad(undo->state == TRX_UNDO_TO_PURGE);
|
|
|
|
trx_undo_mem_free(undo);
|
|
}
|
|
}
|
|
|
|
/**********************************************************************
|
|
Frees or caches an insert undo log after a transaction commit or rollback.
|
|
Knowledge of inserts is not needed after a commit or rollback, therefore
|
|
the data can be discarded. */
|
|
|
|
void
|
|
trx_undo_insert_cleanup(
|
|
/*====================*/
|
|
trx_t* trx) /* in: transaction handle */
|
|
{
|
|
trx_undo_t* undo;
|
|
trx_rseg_t* rseg;
|
|
|
|
undo = trx->insert_undo;
|
|
ut_ad(undo);
|
|
|
|
rseg = trx->rseg;
|
|
|
|
mutex_enter(&(rseg->mutex));
|
|
|
|
UT_LIST_REMOVE(undo_list, rseg->insert_undo_list, undo);
|
|
trx->insert_undo = NULL;
|
|
|
|
if (undo->state == TRX_UNDO_CACHED) {
|
|
|
|
UT_LIST_ADD_FIRST(undo_list, rseg->insert_undo_cached, undo);
|
|
} else {
|
|
ut_ad(undo->state == TRX_UNDO_TO_FREE);
|
|
|
|
/* Delete first the undo log segment in the file */
|
|
|
|
mutex_exit(&(rseg->mutex));
|
|
|
|
trx_undo_seg_free(undo);
|
|
|
|
mutex_enter(&(rseg->mutex));
|
|
|
|
ut_ad(rseg->curr_size > undo->size);
|
|
|
|
rseg->curr_size -= undo->size;
|
|
|
|
trx_undo_mem_free(undo);
|
|
}
|
|
|
|
mutex_exit(&(rseg->mutex));
|
|
}
|