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/******************************************************
Mini-transaction logging routines
(c) 1995 Innobase Oy
Created 12/7/1995 Heikki Tuuri
*******************************************************/
#include "mach0data.h"
#include "ut0lst.h"
#include "buf0buf.h"
/************************************************************
Opens a buffer to mlog. It must be closed with mlog_close. */
UNIV_INLINE
byte*
mlog_open(
/*======*/
/* out: buffer, NULL if log mode MTR_LOG_NONE */
mtr_t* mtr, /* in: mtr */
ulint size) /* in: buffer size in bytes; MUST be
smaller than DYN_ARRAY_DATA_SIZE! */
{
dyn_array_t* mlog;
mtr->modifications = TRUE;
if (mtr_get_log_mode(mtr) == MTR_LOG_NONE) {
return(NULL);
}
mlog = &(mtr->log);
return(dyn_array_open(mlog, size));
}
/************************************************************
Closes a buffer opened to mlog. */
UNIV_INLINE
void
mlog_close(
/*=======*/
mtr_t* mtr, /* in: mtr */
byte* ptr) /* in: buffer space from ptr up was not used */
{
dyn_array_t* mlog;
ut_ad(mtr_get_log_mode(mtr) != MTR_LOG_NONE);
mlog = &(mtr->log);
dyn_array_close(mlog, ptr);
}
/************************************************************
Catenates 1 - 4 bytes to the mtr log. The value is not compressed. */
UNIV_INLINE
void
mlog_catenate_ulint(
/*================*/
mtr_t* mtr, /* in: mtr */
ulint val, /* in: value to write */
ulint type) /* in: MLOG_1BYTE, MLOG_2BYTES, MLOG_4BYTES */
{
dyn_array_t* mlog;
byte* ptr;
if (mtr_get_log_mode(mtr) == MTR_LOG_NONE) {
return;
}
mlog = &(mtr->log);
#if MLOG_1BYTE != 1
# error "MLOG_1BYTE != 1"
#endif
#if MLOG_2BYTES != 2
# error "MLOG_2BYTES != 2"
#endif
#if MLOG_4BYTES != 4
# error "MLOG_4BYTES != 4"
#endif
#if MLOG_8BYTES != 8
# error "MLOG_8BYTES != 8"
#endif
ptr = dyn_array_push(mlog, type);
if (type == MLOG_4BYTES) {
mach_write_to_4(ptr, val);
} else if (type == MLOG_2BYTES) {
mach_write_to_2(ptr, val);
} else {
ut_ad(type == MLOG_1BYTE);
mach_write_to_1(ptr, val);
}
}
/************************************************************
Catenates a compressed ulint to mlog. */
UNIV_INLINE
void
mlog_catenate_ulint_compressed(
/*===========================*/
mtr_t* mtr, /* in: mtr */
ulint val) /* in: value to write */
{
byte* log_ptr;
log_ptr = mlog_open(mtr, 10);
/* If no logging is requested, we may return now */
if (log_ptr == NULL) {
return;
}
log_ptr += mach_write_compressed(log_ptr, val);
mlog_close(mtr, log_ptr);
}
/************************************************************
Catenates a compressed dulint to mlog. */
UNIV_INLINE
void
mlog_catenate_dulint_compressed(
/*============================*/
mtr_t* mtr, /* in: mtr */
dulint val) /* in: value to write */
{
byte* log_ptr;
log_ptr = mlog_open(mtr, 15);
/* If no logging is requested, we may return now */
if (log_ptr == NULL) {
return;
}
log_ptr += mach_dulint_write_compressed(log_ptr, val);
mlog_close(mtr, log_ptr);
}
/************************************************************
Writes the initial part of a log record (3..11 bytes).
If the implementation of this function is changed, all
size parameters to mlog_open() should be adjusted accordingly! */
UNIV_INLINE
byte*
mlog_write_initial_log_record_fast(
/*===============================*/
/* out: new value of log_ptr */
byte* ptr, /* in: pointer to (inside) a buffer frame holding the
file page where modification is made */
byte type, /* in: log item type: MLOG_1BYTE, ... */
byte* log_ptr,/* in: pointer to mtr log which has been opened */
mtr_t* mtr) /* in: mtr */
{
buf_block_t* block;
ulint space;
ulint offset;
ut_ad(mtr_memo_contains(mtr, buf_block_align(ptr),
MTR_MEMO_PAGE_X_FIX));
ut_ad(type <= MLOG_BIGGEST_TYPE);
ut_ad(ptr && log_ptr);
block = buf_block_align(ptr);
space = buf_block_get_space(block);
offset = buf_block_get_page_no(block);
mach_write_to_1(log_ptr, type);
log_ptr++;
log_ptr += mach_write_compressed(log_ptr, space);
log_ptr += mach_write_compressed(log_ptr, offset);
mtr->n_log_recs++;
#ifdef UNIV_LOG_DEBUG
/* fprintf(stderr,
"Adding to mtr log record type %lu space %lu page no %lu\n",
type, space, offset); */
#endif
#ifdef UNIV_DEBUG
/* We now assume that all x-latched pages have been modified! */
if (!mtr_memo_contains(mtr, block, MTR_MEMO_MODIFY)) {
mtr_memo_push(mtr, block, MTR_MEMO_MODIFY);
}
#endif
return(log_ptr);
}
/************************************************************
Writes a log record about an .ibd file create/delete/rename. */
UNIV_INLINE
byte*
mlog_write_initial_log_record_for_file_op(
/*======================================*/
/* out: new value of log_ptr */
ulint type, /* in: MLOG_FILE_CREATE, MLOG_FILE_DELETE, or
MLOG_FILE_RENAME */
ulint space_id,/* in: space id, if applicable */
ulint page_no,/* in: page number (not relevant currently) */
byte* log_ptr,/* in: pointer to mtr log which has been opened */
mtr_t* mtr) /* in: mtr */
{
ut_ad(log_ptr);
mach_write_to_1(log_ptr, type);
log_ptr++;
/* We write dummy space id and page number */
log_ptr += mach_write_compressed(log_ptr, space_id);
log_ptr += mach_write_compressed(log_ptr, page_no);
mtr->n_log_recs++;
return(log_ptr);
}
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