예제 #1
0
/*******************************************************************//**
Fills the "lock_data" member of i_s_locks_row_t object.
If memory can not be allocated then FALSE is returned.
@return	FALSE if allocation fails */
static
ibool
fill_lock_data(
/*===========*/
	const char**		lock_data,/*!< out: "lock_data" to fill */
	const lock_t*		lock,	/*!< in: lock used to find the data */
	ulint			heap_no,/*!< in: rec num used to find the data */
	trx_i_s_cache_t*	cache)	/*!< in/out: cache where to store
					volatile data */
{
	mtr_t			mtr;

	const buf_block_t*	block;
	const page_t*		page;
	const rec_t*		rec;

	ut_a(lock_get_type(lock) == LOCK_REC);

	mtr_start(&mtr);

	block = buf_page_try_get(lock_rec_get_space_id(lock),
				 lock_rec_get_page_no(lock),
				 &mtr);

	if (block == NULL) {

		*lock_data = NULL;

		mtr_commit(&mtr);

		return(TRUE);
	}

	page = (const page_t*) buf_block_get_frame(block);

	rec = page_find_rec_with_heap_no(page, heap_no);

	if (page_rec_is_infimum(rec)) {

		*lock_data = ha_storage_put_str_memlim(
			cache->storage, "infimum pseudo-record",
			MAX_ALLOWED_FOR_STORAGE(cache));
	} else if (page_rec_is_supremum(rec)) {

		*lock_data = ha_storage_put_str_memlim(
			cache->storage, "supremum pseudo-record",
			MAX_ALLOWED_FOR_STORAGE(cache));
	} else {

		const dict_index_t*	index;
		ulint			n_fields;
		mem_heap_t*		heap;
		ulint			offsets_onstack[REC_OFFS_NORMAL_SIZE];
		ulint*			offsets;
		char			buf[TRX_I_S_LOCK_DATA_MAX_LEN];
		ulint			buf_used;
		ulint			i;

		rec_offs_init(offsets_onstack);
		offsets = offsets_onstack;

		index = lock_rec_get_index(lock);

		n_fields = dict_index_get_n_unique(index);

		ut_a(n_fields > 0);

		heap = NULL;
		offsets = rec_get_offsets(rec, index, offsets, n_fields,
					  &heap);

		/* format and store the data */

		buf_used = 0;
		for (i = 0; i < n_fields; i++) {

			buf_used += put_nth_field(
				buf + buf_used, sizeof(buf) - buf_used,
				i, index, rec, offsets) - 1;
		}

		*lock_data = (const char*) ha_storage_put_memlim(
			cache->storage, buf, buf_used + 1,
			MAX_ALLOWED_FOR_STORAGE(cache));

		if (UNIV_UNLIKELY(heap != NULL)) {

			/* this means that rec_get_offsets() has created a new
			heap and has stored offsets in it; check that this is
			really the case and free the heap */
			ut_a(offsets != offsets_onstack);
			mem_heap_free(heap);
		}
	}

	mtr_commit(&mtr);

	if (*lock_data == NULL) {

		return(FALSE);
	}

	return(TRUE);
}
예제 #2
0
/*******************************************************************//**
Builds from a secondary index record a row reference with which we can
search the clustered index record. */
UNIV_INTERN
void
row_build_row_ref_in_tuple(
/*=======================*/
	dtuple_t*		ref,	/*!< in/out: row reference built;
					see the NOTE below! */
	const rec_t*		rec,	/*!< in: record in the index;
					NOTE: the data fields in ref
					will point directly into this
					record, therefore, the buffer
					page of this record must be at
					least s-latched and the latch
					held as long as the row
					reference is used! */
	const dict_index_t*	index,	/*!< in: secondary index */
	ulint*			offsets,/*!< in: rec_get_offsets(rec, index)
					or NULL */
	trx_t*			trx)	/*!< in: transaction */
{
	const dict_index_t*	clust_index;
	dfield_t*		dfield;
	const byte*		field;
	ulint			len;
	ulint			ref_len;
	ulint			pos;
	ulint			clust_col_prefix_len;
	ulint			i;
	mem_heap_t*		heap		= NULL;
	ulint			offsets_[REC_OFFS_NORMAL_SIZE];
	rec_offs_init(offsets_);

	ut_a(ref);
	ut_a(index);
	ut_a(rec);
	ut_ad(!dict_index_is_clust(index));

	if (UNIV_UNLIKELY(!index->table)) {
		fputs("InnoDB: table ", stderr);
notfound:
		ut_print_name(stderr, trx, TRUE, index->table_name);
		fputs(" for index ", stderr);
		ut_print_name(stderr, trx, FALSE, index->name);
		fputs(" not found\n", stderr);
		ut_error;
	}

	clust_index = dict_table_get_first_index(index->table);

	if (UNIV_UNLIKELY(!clust_index)) {
		fputs("InnoDB: clust index for table ", stderr);
		goto notfound;
	}

	if (!offsets) {
		offsets = rec_get_offsets(rec, index, offsets_,
					  ULINT_UNDEFINED, &heap);
	} else {
		ut_ad(rec_offs_validate(rec, index, offsets));
	}

	/* Secondary indexes must not contain externally stored columns. */
	ut_ad(!rec_offs_any_extern(offsets));
	ref_len = dict_index_get_n_unique(clust_index);

	ut_ad(ref_len == dtuple_get_n_fields(ref));

	dict_index_copy_types(ref, clust_index, ref_len);

	for (i = 0; i < ref_len; i++) {
		dfield = dtuple_get_nth_field(ref, i);

		pos = dict_index_get_nth_field_pos(index, clust_index, i);

		ut_a(pos != ULINT_UNDEFINED);

		field = rec_get_nth_field(rec, offsets, pos, &len);

		dfield_set_data(dfield, field, len);

		/* If the primary key contains a column prefix, then the
		secondary index may contain a longer prefix of the same
		column, or the full column, and we must adjust the length
		accordingly. */

		clust_col_prefix_len = dict_index_get_nth_field(
			clust_index, i)->prefix_len;

		if (clust_col_prefix_len > 0) {
			if (len != UNIV_SQL_NULL) {

				const dtype_t*	dtype
					= dfield_get_type(dfield);

				dfield_set_len(dfield,
					       dtype_get_at_most_n_mbchars(
						       dtype->prtype,
						       dtype->mbminlen,
						       dtype->mbmaxlen,
						       clust_col_prefix_len,
						       len, (char*) field));
			}
		}
	}

	ut_ad(dtuple_check_typed(ref));
	if (UNIV_LIKELY_NULL(heap)) {
		mem_heap_free(heap);
	}
}
예제 #3
0
/*******************************************************************//**
Builds from a secondary index record a row reference with which we can
search the clustered index record.
@return	own: row reference built; see the NOTE below! */
UNIV_INTERN
dtuple_t*
row_build_row_ref(
/*==============*/
	ulint		type,	/*!< in: ROW_COPY_DATA, or ROW_COPY_POINTERS:
				the former copies also the data fields to
				heap, whereas the latter only places pointers
				to data fields on the index page */
	dict_index_t*	index,	/*!< in: secondary index */
	const rec_t*	rec,	/*!< in: record in the index;
				NOTE: in the case ROW_COPY_POINTERS
				the data fields in the row will point
				directly into this record, therefore,
				the buffer page of this record must be
				at least s-latched and the latch held
				as long as the row reference is used! */
	mem_heap_t*	heap)	/*!< in: memory heap from which the memory
				needed is allocated */
{
	dict_table_t*	table;
	dict_index_t*	clust_index;
	dfield_t*	dfield;
	dtuple_t*	ref;
	const byte*	field;
	ulint		len;
	ulint		ref_len;
	ulint		pos;
	byte*		buf;
	ulint		clust_col_prefix_len;
	ulint		i;
	mem_heap_t*	tmp_heap	= NULL;
	ulint		offsets_[REC_OFFS_NORMAL_SIZE];
	ulint*		offsets		= offsets_;
	rec_offs_init(offsets_);

	ut_ad(index && rec && heap);
	ut_ad(!dict_index_is_clust(index));

	offsets = rec_get_offsets(rec, index, offsets,
				  ULINT_UNDEFINED, &tmp_heap);
	/* Secondary indexes must not contain externally stored columns. */
	ut_ad(!rec_offs_any_extern(offsets));

	if (type == ROW_COPY_DATA) {
		/* Take a copy of rec to heap */

		buf = mem_heap_alloc(heap, rec_offs_size(offsets));

		rec = rec_copy(buf, rec, offsets);
		/* Avoid a debug assertion in rec_offs_validate(). */
		rec_offs_make_valid(rec, index, offsets);
	}

	table = index->table;

	clust_index = dict_table_get_first_index(table);

	ref_len = dict_index_get_n_unique(clust_index);

	ref = dtuple_create(heap, ref_len);

	dict_index_copy_types(ref, clust_index, ref_len);

	for (i = 0; i < ref_len; i++) {
		dfield = dtuple_get_nth_field(ref, i);

		pos = dict_index_get_nth_field_pos(index, clust_index, i);

		ut_a(pos != ULINT_UNDEFINED);

		field = rec_get_nth_field(rec, offsets, pos, &len);

		dfield_set_data(dfield, field, len);

		/* If the primary key contains a column prefix, then the
		secondary index may contain a longer prefix of the same
		column, or the full column, and we must adjust the length
		accordingly. */

		clust_col_prefix_len = dict_index_get_nth_field(
			clust_index, i)->prefix_len;

		if (clust_col_prefix_len > 0) {
			if (len != UNIV_SQL_NULL) {

				const dtype_t*	dtype
					= dfield_get_type(dfield);

				dfield_set_len(dfield,
					       dtype_get_at_most_n_mbchars(
						       dtype->prtype,
						       dtype->mbminlen,
						       dtype->mbmaxlen,
						       clust_col_prefix_len,
						       len, (char*) field));
			}
		}
	}

	ut_ad(dtuple_check_typed(ref));
	if (tmp_heap) {
		mem_heap_free(tmp_heap);
	}

	return(ref);
}
예제 #4
0
/*******************************************************************//**
An inverse function to row_build_index_entry. Builds a row from a
record in a clustered index.
@return	own: row built; see the NOTE below! */
UNIV_INTERN
dtuple_t*
row_build(
/*======*/
	ulint			type,	/*!< in: ROW_COPY_POINTERS or
					ROW_COPY_DATA; the latter
					copies also the data fields to
					heap while the first only
					places pointers to data fields
					on the index page, and thus is
					more efficient */
	const dict_index_t*	index,	/*!< in: clustered index */
	const rec_t*		rec,	/*!< in: record in the clustered
					index; NOTE: in the case
					ROW_COPY_POINTERS the data
					fields in the row will point
					directly into this record,
					therefore, the buffer page of
					this record must be at least
					s-latched and the latch held
					as long as the row dtuple is used! */
	const ulint*		offsets,/*!< in: rec_get_offsets(rec,index)
					or NULL, in which case this function
					will invoke rec_get_offsets() */
	const dict_table_t*	col_table,
					/*!< in: table, to check which
					externally stored columns
					occur in the ordering columns
					of an index, or NULL if
					index->table should be
					consulted instead */
	row_ext_t**		ext,	/*!< out, own: cache of
					externally stored column
					prefixes, or NULL */
	mem_heap_t*		heap)	/*!< in: memory heap from which
					the memory needed is allocated */
{
	dtuple_t*		row;
	const dict_table_t*	table;
	ulint			n_fields;
	ulint			n_ext_cols;
	ulint*			ext_cols	= NULL; /* remove warning */
	ulint			len;
	ulint			row_len;
	byte*			buf;
	ulint			i;
	ulint			j;
	mem_heap_t*		tmp_heap	= NULL;
	ulint			offsets_[REC_OFFS_NORMAL_SIZE];
	rec_offs_init(offsets_);

	ut_ad(index && rec && heap);
	ut_ad(dict_index_is_clust(index));
	ut_ad(!mutex_own(&kernel_mutex));

	if (!offsets) {
		offsets = rec_get_offsets(rec, index, offsets_,
					  ULINT_UNDEFINED, &tmp_heap);
	} else {
		ut_ad(rec_offs_validate(rec, index, offsets));
	}

#if defined UNIV_DEBUG || defined UNIV_BLOB_LIGHT_DEBUG
	if (rec_offs_any_null_extern(rec, offsets)) {
		/* This condition can occur during crash recovery
		before trx_rollback_active() has completed execution,
		or when a concurrently executing
		row_ins_index_entry_low() has committed the B-tree
		mini-transaction but has not yet managed to restore
		the cursor position for writing the big_rec. */
		ut_a(trx_undo_roll_ptr_is_insert(
			     row_get_rec_roll_ptr(rec, index, offsets)));
	}
#endif /* UNIV_DEBUG || UNIV_BLOB_LIGHT_DEBUG */

	if (type != ROW_COPY_POINTERS) {
		/* Take a copy of rec to heap */
		buf = mem_heap_alloc(heap, rec_offs_size(offsets));
		rec = rec_copy(buf, rec, offsets);
		/* Avoid a debug assertion in rec_offs_validate(). */
		rec_offs_make_valid(rec, index, (ulint*) offsets);
	}

	table = index->table;
	row_len = dict_table_get_n_cols(table);

	row = dtuple_create(heap, row_len);

	dict_table_copy_types(row, table);

	dtuple_set_info_bits(row, rec_get_info_bits(
				     rec, dict_table_is_comp(table)));

	n_fields = rec_offs_n_fields(offsets);
	n_ext_cols = rec_offs_n_extern(offsets);
	if (n_ext_cols) {
		ext_cols = mem_heap_alloc(heap, n_ext_cols * sizeof *ext_cols);
	}

	for (i = j = 0; i < n_fields; i++) {
		dict_field_t*		ind_field
			= dict_index_get_nth_field(index, i);
		const dict_col_t*	col
			= dict_field_get_col(ind_field);
		ulint			col_no
			= dict_col_get_no(col);
		dfield_t*		dfield
			= dtuple_get_nth_field(row, col_no);

		if (ind_field->prefix_len == 0) {

			const byte*	field = rec_get_nth_field(
				rec, offsets, i, &len);

			dfield_set_data(dfield, field, len);
		}

		if (rec_offs_nth_extern(offsets, i)) {
			dfield_set_ext(dfield);

			if (UNIV_LIKELY_NULL(col_table)) {
				ut_a(col_no
				     < dict_table_get_n_cols(col_table));
				col = dict_table_get_nth_col(
					col_table, col_no);
			}

			if (col->ord_part) {
				/* We will have to fetch prefixes of
				externally stored columns that are
				referenced by column prefixes. */
				ext_cols[j++] = col_no;
			}
		}
	}

	ut_ad(dtuple_check_typed(row));

	if (!ext) {
		/* REDUNDANT and COMPACT formats store a local
		768-byte prefix of each externally stored
		column. No cache is needed. */
		ut_ad(dict_table_get_format(index->table)
		      < DICT_TF_FORMAT_ZIP);
	} else if (j) {
		*ext = row_ext_create(j, ext_cols, row,
				      dict_table_zip_size(index->table),
				      heap);
	} else {
		*ext = NULL;
	}

	if (tmp_heap) {
		mem_heap_free(tmp_heap);
	}

	return(row);
}
예제 #5
0
/***********************************************************//**
Looks for the clustered index record when node has the row reference.
The pcur in node is used in the search. If found, stores the row to node,
and stores the position of pcur, and detaches it. The pcur must be closed
by the caller in any case.
@return TRUE if found; NOTE the node->pcur must be closed by the
caller, regardless of the return value */
UNIV_INTERN
ibool
row_undo_search_clust_to_pcur(
/*==========================*/
	undo_node_t*	node)	/*!< in: row undo node */
{
	dict_index_t*	clust_index;
	ibool		found;
	mtr_t		mtr;
	ibool		ret;
	rec_t*		rec;
	mem_heap_t*	heap		= NULL;
	ulint		offsets_[REC_OFFS_NORMAL_SIZE];
	ulint*		offsets		= offsets_;
	rec_offs_init(offsets_);

	mtr_start(&mtr);

	clust_index = dict_table_get_first_index(node->table);

	found = row_search_on_row_ref(&(node->pcur), BTR_MODIFY_LEAF,
				      node->table, node->ref, &mtr);

	rec = btr_pcur_get_rec(&(node->pcur));

	offsets = rec_get_offsets(rec, clust_index, offsets,
				  ULINT_UNDEFINED, &heap);

	if (!found || 0 != ut_dulint_cmp(node->roll_ptr,
					 row_get_rec_roll_ptr(rec, clust_index,
							      offsets))) {

		/* We must remove the reservation on the undo log record
		BEFORE releasing the latch on the clustered index page: this
		is to make sure that some thread will eventually undo the
		modification corresponding to node->roll_ptr. */

		/* fputs("--------------------undoing a previous version\n",
		stderr); */

		ret = FALSE;
	} else {
		node->row = row_build(ROW_COPY_DATA, clust_index, rec,
				      offsets, NULL, &node->ext, node->heap);
		if (node->update) {
			node->undo_row = dtuple_copy(node->row, node->heap);
			row_upd_replace(node->undo_row, &node->undo_ext,
					clust_index, node->update, node->heap);
		} else {
			node->undo_row = NULL;
			node->undo_ext = NULL;
		}

		btr_pcur_store_position(&(node->pcur), &mtr);

		ret = TRUE;
	}

	btr_pcur_commit_specify_mtr(&(node->pcur), &mtr);

	if (UNIV_LIKELY_NULL(heap)) {
		mem_heap_free(heap);
	}
	return(ret);
}
예제 #6
0
파일: row0purge.c 프로젝트: Canos/mysql
/***********************************************************//**
Removes a delete marked clustered index record if possible.
@return TRUE if success, or if not found, or if modified after the
delete marking */
static
ibool
row_purge_remove_clust_if_poss_low(
    /*===============================*/
    purge_node_t*	node,	/*!< in: row purge node */
    ulint		mode)	/*!< in: BTR_MODIFY_LEAF or BTR_MODIFY_TREE */
{
    dict_index_t*	index;
    btr_pcur_t*	pcur;
    btr_cur_t*	btr_cur;
    ibool		success;
    ulint		err;
    mtr_t		mtr;
    rec_t*		rec;
    mem_heap_t*	heap		= NULL;
    ulint		offsets_[REC_OFFS_NORMAL_SIZE];
    rec_offs_init(offsets_);

    index = dict_table_get_first_index(node->table);

    pcur = &(node->pcur);
    btr_cur = btr_pcur_get_btr_cur(pcur);

    log_free_check();
    mtr_start(&mtr);

    success = row_purge_reposition_pcur(mode, node, &mtr);

    if (!success) {
        /* The record is already removed */

        btr_pcur_commit_specify_mtr(pcur, &mtr);

        return(TRUE);
    }

    rec = btr_pcur_get_rec(pcur);

    if (node->roll_ptr != row_get_rec_roll_ptr(
                rec, index, rec_get_offsets(rec, index, offsets_,
                                            ULINT_UNDEFINED, &heap))) {
        if (UNIV_LIKELY_NULL(heap)) {
            mem_heap_free(heap);
        }
        /* Someone else has modified the record later: do not remove */
        btr_pcur_commit_specify_mtr(pcur, &mtr);

        return(TRUE);
    }

    if (UNIV_LIKELY_NULL(heap)) {
        mem_heap_free(heap);
    }

    if (mode == BTR_MODIFY_LEAF) {
        success = btr_cur_optimistic_delete(btr_cur, &mtr);
    } else {
        ut_ad(mode == BTR_MODIFY_TREE);
        btr_cur_pessimistic_delete(&err, FALSE, btr_cur,
                                   RB_NONE, &mtr);

        if (err == DB_SUCCESS) {
            success = TRUE;
        } else if (err == DB_OUT_OF_FILE_SPACE) {
            success = FALSE;
        } else {
            ut_error;
        }
    }

    btr_pcur_commit_specify_mtr(pcur, &mtr);

    return(success);
}