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mariadb/innobase/trx/trx0undo.c
unknown 80fe399fee InnoDB: send diagnostic output to stderr or files 
instead of stdout or fixed-size memory buffers


innobase/btr/btr0btr.c:
  Output to stderr; quote table and index names
innobase/btr/btr0cur.c:
  Output to stderr; quote table and index names
innobase/btr/btr0sea.c:
  Output to stderr
innobase/buf/buf0buf.c:
  Output to stderr; quote table and index names
innobase/buf/buf0flu.c:
  Output to stderr
innobase/buf/buf0lru.c:
  Output to stderr
innobase/buf/buf0rea.c:
  Output to stderr
innobase/data/data0data.c:
  Remove dtuple_validate() unless #ifdef UNIV_DEBUG
  Remove unnecessary sprintf() calls
  Output to stderr
innobase/data/data0type.c:
  Output to stderr
innobase/dict/dict0boot.c:
  Remove dummy call to printf()
innobase/dict/dict0crea.c:
  Output diagnostic information to stream, not to memory
innobase/dict/dict0dict.c:
  Output diagnostics to a file, not to a memory buffer
innobase/dict/dict0load.c:
  Output to stderr; quote table and index names
innobase/eval/eval0eval.c:
  Output to stderr
innobase/fil/fil0fil.c:
  Output to stderr
innobase/fsp/fsp0fsp.c:
  Output to stderr
  Avoid sprintf()
innobase/fut/fut0lst.c:
  Output to stderr
innobase/ha/ha0ha.c:
  Output to stream, not to memory buffer
innobase/ibuf/ibuf0ibuf.c:
  Output to stderr
  Avoid sprintf()
innobase/include/buf0buf.h:
  Output to stream, not to memory buffer
innobase/include/buf0buf.ic:
  Use %p for displaying pointers
innobase/include/data0data.h:
  Remove dtuple_sprintf()
innobase/include/dict0dict.h:
  Output to stream, not to memory buffer
innobase/include/ha0ha.h:
  Output to stream, not to memory buffer
innobase/include/ibuf0ibuf.h:
  Output to stream, not to memory buffer
innobase/include/lock0lock.h:
  Output to stream, not to memory buffer
innobase/include/log0log.h:
  Output to stream, not to memory buffer
innobase/include/mtr0log.ic:
  Output to stderr
  Display pointers with %p
innobase/include/os0file.h:
  Output to stream, not to memory buffer
innobase/include/rem0rec.h:
  Remove rec_sprintf()
innobase/include/rem0rec.ic:
  Output to stderr
innobase/include/row0sel.ic:
  Output to stderr
innobase/include/row0upd.ic:
  Quote table and index names
innobase/include/srv0srv.h:
  Remove srv_sprintf_innodb_monitor()
innobase/include/sync0arr.h:
  Output to stream, not to memory buffer
innobase/include/sync0sync.h:
  Output to stream, not to memory buffer
innobase/include/trx0sys.h:
  Output to stderr
innobase/include/trx0trx.h:
  Output to stream, not to memory buffer
innobase/include/ut0ut.h:
  Remove ut_sprintf_buf()
  Add ut_print_name(), ut_print_namel() and ut_copy_file()
innobase/lock/lock0lock.c:
  Output to stream, not to memory buffer
innobase/log/log0log.c:
  Output to stderr
innobase/log/log0recv.c:
  Output to stderr
innobase/mem/mem0dbg.c:
  Output to stderr
innobase/mtr/mtr0log.c:
  Display pointers with %p
innobase/mtr/mtr0mtr.c:
  Output to stderr
innobase/os/os0file.c:
  Output to stream, not to memory buffer
innobase/os/os0proc.c:
  Output to stderr
innobase/os/os0thread.c:
  Output to stderr
innobase/page/page0cur.c:
  Output to stderr
innobase/page/page0page.c:
  Avoid sprintf()
  Output to stderr instead of stdout
innobase/pars/pars0opt.c:
  Output to stderr instead of stdout
innobase/rem/rem0rec.c:
  Remove rec_sprintf()
  Output to stderr instead of stdout
innobase/row/row0ins.c:
  Output diagnostics to stream instead of memory buffer
innobase/row/row0mysql.c:
  Output to stderr instead of stdout
  Quote table and index names
innobase/row/row0purge.c:
  Output to stderr instead of stdout
innobase/row/row0row.c:
  Quote table and index names
innobase/row/row0sel.c:
  Output to stderr instead of stdout
  Quote table and index names
innobase/row/row0umod.c:
  Avoid sprintf()
  Quote table and index names
innobase/row/row0undo.c:
  Output to stderr instead of stdout
innobase/row/row0upd.c:
  Avoid sprintf()
innobase/srv/srv0srv.c:
  Output to stderr instead of stdout
innobase/srv/srv0start.c:
  Handle srv_monitor_file
  Make some global variables static
innobase/sync/sync0arr.c:
  Output to stderr instead of stdout
  Output to stream instead of memory buffer
innobase/sync/sync0rw.c:
  Output to stderr instead of stdout
innobase/sync/sync0sync.c:
  Output to stderr instead of stdout
  Output to stream instead of memory buffer
innobase/trx/trx0purge.c:
  Output to stderr instead of stdout
innobase/trx/trx0rec.c:
  Quote index and table names
  Avoid sprintf()
innobase/trx/trx0roll.c:
  Quote identifier names
  Output to stderr instead of stdout
innobase/trx/trx0sys.c:
  Output to stderr instead of stdout
innobase/trx/trx0trx.c:
  Output to stream instead of memory buffer
innobase/trx/trx0undo.c:
  Output to stderr instead of stdout
innobase/ut/ut0ut.c:
  Declare mysql_get_identifier_quote_char()
  Remove ut_sprintf_buf()
  Add ut_print_name() and ut_print_namel()
  Add ut_copy_file()
sql/ha_innodb.cc:
  innobase_mysql_print_thd(): output to stream, not to memory buffer
  Add mysql_get_identifier_quote_char()
  Remove unused function innobase_print_error()
  Display pointers with %p
  Buffer InnoDB output via files, not via statically allocated memory
2004-04-06 16:14:43 +03:00

1763 lines
46 KiB
C
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/******************************************************
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"
/* 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 */
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. */
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;
ibool success;
ut_ad(mtr && id && rseg_hdr);
#ifdef UNIV_SYNC_DEBUG
ut_ad(mutex_own(&(rseg->mutex)));
#endif /* UNIV_SYNC_DEBUG */
/* 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?");
return(NULL);
}
space = buf_frame_get_space_id(rseg_hdr);
success = fsp_reserve_free_extents(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, 2);
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. */
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 is
TRX_UNDO_LOG_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_HDR_SIZE;
ut_ad(new_free <= UNIV_PAGE_SIZE);
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_2(log_hdr + TRX_UNDO_DICT_OPERATION, FALSE);
mach_write_to_2(log_hdr + TRX_UNDO_NEXT_LOG, 0);
mach_write_to_2(log_hdr + TRX_UNDO_PREV_LOG, prev_log);
trx_undo_header_create_log(undo_page, trx_id, mtr);
return(free);
}
/**************************************************************************
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. */
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;
log_hdr = undo_page + free;
new_free = free + TRX_UNDO_LOG_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_2(log_hdr + TRX_UNDO_DICT_OPERATION, FALSE);
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;
ibool success;
#ifdef UNIV_SYNC_DEBUG
ut_ad(mutex_own(&(trx->undo_mutex)));
ut_ad(!mutex_own(&kernel_mutex));
ut_ad(mutex_own(&(trx->rseg->mutex)));
#endif /* UNIV_SYNC_DEBUG */
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(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, 1);
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 hdr_offset, /* in: header offset */
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_NOT_USED(hdr_offset);
ut_a(hdr_page_no != page_no);
#ifdef UNIV_SYNC_DEBUG
ut_ad(!mutex_own(&kernel_mutex));
ut_ad(mutex_own(&(rseg->mutex)));
#endif /* UNIV_SYNC_DEBUG */
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);
#ifdef UNIV_SYNC_DEBUG
ut_ad(mutex_own(&(trx->undo_mutex)));
#endif /* UNIV_SYNC_DEBUG */
last_page_no = trx_undo_free_page(undo->rseg, FALSE, undo->space,
undo->hdr_page_no, undo->hdr_offset,
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;
#ifdef UNIV_SYNC_DEBUG
ut_ad(mutex_own(&(trx->undo_mutex)));
ut_ad(mutex_own(&(trx->rseg->mutex)));
#endif /* UNIV_SYNC_DEBUG */
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;
#ifdef UNIV_SYNC_DEBUG
ut_ad(mutex_own(&(rseg->mutex)));
#endif /* UNIV_SYNC_DEBUG */
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, hdr_offset,
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);
#ifdef UNIV_SYNC_DEBUG
ut_ad(!mutex_own(&kernel_mutex));
#endif /* UNIV_SYNC_DEBUG */
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;
if (id >= TRX_RSEG_N_SLOTS) {
fprintf(stderr,
"InnoDB: Error: undo->id is %lu\n", 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);
mutex_enter(&(rseg->mutex));
undo = trx_undo_mem_create(rseg, id, type, trx_id, page_no, offset);
mutex_exit(&(rseg->mutex));
undo->dict_operation = mtr_read_ulint(
undo_header + TRX_UNDO_DICT_OPERATION,
MLOG_2BYTES, 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 */
ulint page_no,/* in: undo log header page number */
ulint offset) /* in: undo log header byte offset on page */
{
trx_undo_t* undo;
#ifdef UNIV_SYNC_DEBUG
ut_ad(mutex_own(&(rseg->mutex)));
#endif /* UNIV_SYNC_DEBUG */
if (id >= TRX_RSEG_N_SLOTS) {
fprintf(stderr,
"InnoDB: Error: undo->id is %lu\n", 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->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 */
ulint offset) /* in: undo log header byte offset on page */
{
#ifdef UNIV_SYNC_DEBUG
ut_ad(mutex_own(&((undo->rseg)->mutex)));
#endif /* UNIV_SYNC_DEBUG */
if (undo->id >= TRX_RSEG_N_SLOTS) {
fprintf(stderr, "InnoDB: Error: undo->id is %lu\n", undo->id);
mem_analyze_corruption((byte*)undo);
ut_error;
}
undo->state = TRX_UNDO_ACTIVE;
undo->del_marks = FALSE;
undo->trx_id = trx_id;
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", 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_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 */
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;
#ifdef UNIV_SYNC_DEBUG
ut_ad(mutex_own(&(rseg->mutex)));
#endif /* UNIV_SYNC_DEBUG */
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);
undo = trx_undo_mem_create(rseg, id, type, trx_id, 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_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 */
mtr_t* mtr) /* in: mtr */
{
trx_undo_t* undo;
page_t* undo_page;
ulint offset;
#ifdef UNIV_SYNC_DEBUG
ut_ad(mutex_own(&(rseg->mutex)));
#endif /* UNIV_SYNC_DEBUG */
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", undo->id);
mem_analyze_corruption((byte*)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);
} 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);
}
trx_undo_mem_init_for_reuse(undo, trx_id, 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_OPERATION,
trx->dict_operation, MLOG_2BYTES, 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;
#ifdef UNIV_SYNC_DEBUG
ut_ad(mutex_own(&(trx->undo_mutex)));
#endif /* UNIV_SYNC_DEBUG */
mtr_start(&mtr);
#ifdef UNIV_SYNC_DEBUG
ut_ad(!mutex_own(&kernel_mutex));
#endif /* UNIV_SYNC_DEBUG */
mutex_enter(&(rseg->mutex));
undo = trx_undo_reuse_cached(rseg, type, trx->id, &mtr);
if (undo == NULL) {
undo = trx_undo_create(rseg, type, trx->id, &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", undo->id);
mem_analyze_corruption((byte*)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);
}
/**************************************************************************
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;
#ifdef UNIV_SYNC_DEBUG
ut_ad(mutex_own(&(rseg->mutex)));
#endif /* UNIV_SYNC_DEBUG */
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);
}
}
/**************************************************************************
Discards an undo log and puts the segment to the list of cached update undo
log segments. This optimized function is called if there is no need to keep
the update undo log because there exist no read views and the transaction
made no delete markings, which would make purge necessary. We restrict this
to undo logs of size 1 to make things simpler. */
dulint
trx_undo_update_cleanup_by_discard(
/*===============================*/
/* out: log sequence number at which mtr is
committed */
trx_t* trx, /* in: trx owning the update undo log */
mtr_t* mtr) /* in: mtr */
{
trx_rseg_t* rseg;
trx_undo_t* undo;
page_t* undo_page;
undo = trx->update_undo;
rseg = trx->rseg;
#ifdef UNIV_SYNC_DEBUG
ut_ad(mutex_own(&(rseg->mutex)));
ut_ad(mutex_own(&kernel_mutex));
#endif /* UNIV_SYNC_DEBUG */
ut_ad(undo->size == 1);
ut_ad(undo->del_marks == FALSE);
ut_ad(UT_LIST_GET_LEN(trx_sys->view_list) == 1);
/* NOTE: we must hold the kernel mutex, because we must prevent
creation of new read views before mtr gets committed! */
undo_page = trx_undo_page_get(undo->space, undo->hdr_page_no, mtr);
trx_undo_discard_latest_update_undo(undo_page, mtr);
undo->state = TRX_UNDO_CACHED;
UT_LIST_REMOVE(undo_list, rseg->update_undo_list, undo);
trx->update_undo = NULL;
UT_LIST_ADD_FIRST(undo_list, rseg->update_undo_cached, undo);
mtr_commit(mtr);
return(mtr->end_lsn);
}
/**********************************************************************
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));
}
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