MDEV-21174: Replace mlog_write_string() with mtr_t::memcpy()

mtr_t::memcpy(): Replaces mlog_write_string(), mlog_log_string().
The buf_block_t is passed a parameter, so that
mlog_write_initial_log_record_low() can be used instead of
mlog_write_initial_log_record_fast().

fil_space_crypt_t::write_page0(): Remove the fil_space_t* parameter.

13 files changed, 130 insertions, 155 deletions

diff --git a/storage/innobase/btr/btr0btr.cc b/storage/innobase/btr/btr0btr.cc
index 01c28f6c88f..aa785fa2abd 100644
--- a/storage/innobase/btr/btr0btr.cc
+++ b/storage/innobase/btr/btr0btr.cc
@@ -1627,15 +1627,11 @@ func_exit:
 					    mach_read_from_2(instant));
 		if (!index->table->instant) {
 		} else if (page_is_comp(block->frame)) {
-			mlog_log_string(PAGE_NEW_INFIMUM + block->frame, 8,
-					mtr);
-			mlog_log_string(PAGE_NEW_SUPREMUM + block->frame, 8,
-					mtr);
+			mtr->memcpy(*block, PAGE_NEW_INFIMUM, 8);
+			mtr->memcpy(*block, PAGE_NEW_SUPREMUM, 8);
 		} else {
-			mlog_log_string(PAGE_OLD_INFIMUM + block->frame, 8,
-					mtr);
-			mlog_log_string(PAGE_OLD_SUPREMUM + block->frame, 8,
-					mtr);
+			mtr->memcpy(*block, PAGE_OLD_INFIMUM, 8);
+			mtr->memcpy(*block, PAGE_OLD_SUPREMUM, 8);
 		}
 	}
 
diff --git a/storage/innobase/btr/btr0cur.cc b/storage/innobase/btr/btr0cur.cc
index d6fc8ef28d0..932072ad182 100644
--- a/storage/innobase/btr/btr0cur.cc
+++ b/storage/innobase/btr/btr0cur.cc
@@ -7723,7 +7723,7 @@ btr_store_big_rec_extern_fields(
 				be made simpler.  Before InnoDB Plugin
 				1.0.4, the initialization of
 				FIL_PAGE_TYPE was logged as part of
-				the mlog_log_string() below. */
+				the mtr_t::memcpy() below. */
 
 				mtr.write<2>(*block,
 					     block->frame + FIL_PAGE_TYPE,
@@ -7770,12 +7770,11 @@ btr_store_big_rec_extern_fields(
 				mtr.write<4>(*block, block->frame
 					     + FIL_PAGE_FILE_FLUSH_LSN_OR_KEY_VERSION + 4,
 					     rec_page_no);
-				mlog_log_string(block->frame
-						+ FIL_PAGE_FILE_FLUSH_LSN_OR_KEY_VERSION,
-						page_zip_get_size(page_zip)
-						- FIL_PAGE_FILE_FLUSH_LSN_OR_KEY_VERSION
-						- c_stream.avail_out,
-						&mtr);
+				mtr.memcpy(*block,
+					   FIL_PAGE_FILE_FLUSH_LSN_OR_KEY_VERSION,
+					   page_zip_get_size(page_zip)
+					   - FIL_PAGE_FILE_FLUSH_LSN_OR_KEY_VERSION
+					   - c_stream.avail_out);
 				/* Zero out the unused part of the page. */
 				if (c_stream.avail_out) {
 					mtr.memset(block,
@@ -7852,14 +7851,12 @@ next_zip_page:
 					store_len = extern_len;
 				}
 
-				mlog_write_string(FIL_PAGE_DATA
-						  + BTR_BLOB_HDR_SIZE
-						  + block->frame,
-						  (const byte*)
-						  big_rec_vec->fields[i].data
-						  + big_rec_vec->fields[i].len
-						  - extern_len,
-						  store_len, &mtr);
+				mtr.memcpy(block,
+					   FIL_PAGE_DATA + BTR_BLOB_HDR_SIZE,
+					   (const byte*)
+					   big_rec_vec->fields[i].data
+					   + big_rec_vec->fields[i].len
+					   - extern_len, store_len);
 				mtr.write<4>(*block, BTR_BLOB_HDR_PART_LEN
 					     + FIL_PAGE_DATA + block->frame,
 					     store_len);
diff --git a/storage/innobase/fil/fil0crypt.cc b/storage/innobase/fil/fil0crypt.cc
index 044e6312025..7ffc328726f 100644
--- a/storage/innobase/fil/fil0crypt.cc
+++ b/storage/innobase/fil/fil0crypt.cc
@@ -408,25 +408,17 @@ fil_space_crypt_t::fill_page0(
 			encryption);
 }
 
-/******************************************************************
-Write crypt data to a page (0)
-@param[in]	space	tablespace
-@param[in,out]	page0	first page of the tablespace
+/** Write encryption metadata to the first page.
+@param[in,out]	block	first page of the tablespace
 @param[in,out]	mtr	mini-transaction */
-UNIV_INTERN
-void
-fil_space_crypt_t::write_page0(
-	const fil_space_t*	space,
-	byte* 			page,
-	mtr_t*			mtr)
+void fil_space_crypt_t::write_page0(buf_block_t* block, mtr_t* mtr)
 {
-	ut_ad(this == space->crypt_data);
 	const ulint offset = FSP_HEADER_OFFSET
-		+ fsp_header_get_encryption_offset(space->zip_size());
-	byte* b = page + offset;
+		+ fsp_header_get_encryption_offset(block->zip_size());
+	byte* b = block->frame + offset;
 
 	if (memcmp(b, CRYPT_MAGIC, MAGIC_SZ)) {
-		mlog_write_string(b, CRYPT_MAGIC, MAGIC_SZ, mtr);
+		mtr->memcpy(block, offset, CRYPT_MAGIC, MAGIC_SZ);
 	}
 
 	b += MAGIC_SZ;
@@ -443,7 +435,7 @@ fil_space_crypt_t::write_page0(
 	b += 4;
 	*b++ = byte(encryption);
 	ut_ad(b - start == 11 + MY_AES_BLOCK_SIZE);
-	mlog_log_string(start, b - start, mtr);
+	mtr->memcpy(*block, offset + MAGIC_SZ, b - start);
 }
 
 /******************************************************************
@@ -1255,9 +1247,8 @@ static bool fil_crypt_start_encrypting_space(fil_space_t* space)
 
 
 		/* 3 - write crypt data to page 0 */
-		byte* frame = buf_block_get_frame(block);
 		crypt_data->type = CRYPT_SCHEME_1;
-		crypt_data->write_page0(space, frame, &mtr);
+		crypt_data->write_page0(block, &mtr);
 
 		mtr.commit();
 
@@ -2243,7 +2234,7 @@ fil_crypt_flush_space(
 		    RW_X_LATCH, NULL, BUF_GET,
 		    __FILE__, __LINE__, &mtr, &err)) {
 		mtr.set_named_space(space);
-		crypt_data->write_page0(space, block->frame, &mtr);
+		crypt_data->write_page0(block, &mtr);
 	}
 
 	mtr.commit();
diff --git a/storage/innobase/fsp/fsp0fsp.cc b/storage/innobase/fsp/fsp0fsp.cc
index 88db0ae498f..25fd9b0aabf 100644
--- a/storage/innobase/fsp/fsp0fsp.cc
+++ b/storage/innobase/fsp/fsp0fsp.cc
@@ -608,7 +608,7 @@ void fsp_header_init(fil_space_t* space, ulint size, mtr_t* mtr)
 	if (space->crypt_data &&
 	    (space->crypt_data->should_encrypt() ||
 	     space->crypt_data->not_encrypted())) {
-		space->crypt_data->write_page0(space, block->frame, mtr);
+		space->crypt_data->write_page0(block, mtr);
 	}
 }
 
diff --git a/storage/innobase/include/fil0crypt.h b/storage/innobase/include/fil0crypt.h
index 2776ae6ea35..c604c4f70d3 100644
--- a/storage/innobase/include/fil0crypt.h
+++ b/storage/innobase/include/fil0crypt.h
@@ -183,11 +183,10 @@ struct fil_space_crypt_t : st_encryption_scheme
 	@param[in,out]	page	first page of the tablespace */
 	void fill_page0(ulint flags, byte* page);
 
-	/** Write crypt data to a page (0)
-	@param[in]	space	tablespace
-	@param[in,out]	page0	first page of the tablespace
+	/** Write encryption metadata to the first page.
+	@param[in,out]	block	first page of the tablespace
 	@param[in,out]	mtr	mini-transaction */
-	void write_page0(const fil_space_t* space, byte* page0, mtr_t* mtr);
+	void write_page0(buf_block_t* block, mtr_t* mtr);
 
 	uint min_key_version; // min key version for this space
 	fil_encryption_t encryption; // Encryption setup
diff --git a/storage/innobase/include/mtr0log.h b/storage/innobase/include/mtr0log.h
index e9e821e1ccb..87e0781af61 100644
--- a/storage/innobase/include/mtr0log.h
+++ b/storage/innobase/include/mtr0log.h
@@ -34,26 +34,6 @@ Created 12/7/1995 Heikki Tuuri
 struct dict_index_t;
 
 /********************************************************//**
-Writes a string to a file page buffered in the buffer pool. Writes the
-corresponding log record to the mini-transaction log. */
-void
-mlog_write_string(
-/*==============*/
-	byte*		ptr,	/*!< in: pointer where to write */
-	const byte*	str,	/*!< in: string to write */
-	ulint		len,	/*!< in: string length */
-	mtr_t*		mtr);	/*!< in: mini-transaction handle */
-/********************************************************//**
-Logs a write of a string to a file page buffered in the buffer pool.
-Writes the corresponding log record to the mini-transaction log. */
-void
-mlog_log_string(
-/*============*/
-	byte*	ptr,	/*!< in: pointer written to */
-	ulint	len,	/*!< in: string length */
-	mtr_t*	mtr);	/*!< in: mini-transaction handle */
-
-/********************************************************//**
 Catenates 1 - 4 bytes to the mtr log. The value is not compressed. */
 UNIV_INLINE
 void
@@ -157,6 +137,18 @@ inline void mtr_t::write(const buf_block_t &block, byte *ptr, V val)
               static_cast<uint32_t>(val));
 }
 
+/** Write a byte string to a page.
+@param[in,out]  b       buffer page
+@param[in]      ofs     byte offset from b->frame
+@param[in]      str     the data to write
+@param[in]      len     length of the data to write */
+inline
+void mtr_t::memcpy(buf_block_t *b, ulint offset, const void *str, ulint len)
+{
+  ::memcpy(b->frame + offset, str, len);
+  memcpy(*b, offset, len);
+}
+
 /** Writes a log record about an operation.
 @param[in]	type		redo log record type
 @param[in]	space_id	tablespace identifier
@@ -213,7 +205,7 @@ mlog_parse_nbytes(
 				or NULL */
 	void*		page_zip);/*!< in/out: compressed page, or NULL */
 /********************************************************//**
-Parses a log record written by mlog_write_string.
+Parses a log record written by mtr_t::memcpy().
 @return parsed record end, NULL if not a complete record */
 const byte*
 mlog_parse_string(
diff --git a/storage/innobase/include/mtr0mtr.h b/storage/innobase/include/mtr0mtr.h
index d64cfc36b1a..635270d8a11 100644
--- a/storage/innobase/include/mtr0mtr.h
+++ b/storage/innobase/include/mtr0mtr.h
@@ -447,6 +447,20 @@ struct mtr_t {
   inline void write(const buf_block_t &block, byte *ptr, V val)
     MY_ATTRIBUTE((nonnull));
 
+  /** Log a write of a byte string to a page.
+  @param[in]      b       buffer page
+  @param[in]      ofs     byte offset from b->frame
+  @param[in]      str     the data to write
+  @param[in]      len     length of the data to write */
+  void memcpy(const buf_block_t &b, ulint ofs, ulint len);
+
+  /** Write a byte string to a page.
+  @param[in,out]  b       buffer page
+  @param[in]      ofs     byte offset from b->frame
+  @param[in]      str     the data to write
+  @param[in]      len     length of the data to write */
+  inline void memcpy(buf_block_t *b, ulint offset, const void *str, ulint len);
+
   /** Initialize a string of bytes.
   @param[in,out]        b       buffer page
   @param[in]            ofs     byte offset from b->frame
diff --git a/storage/innobase/mtr/mtr0log.cc b/storage/innobase/mtr/mtr0log.cc
index cb2b5a84354..60ed8830593 100644
--- a/storage/innobase/mtr/mtr0log.cc
+++ b/storage/innobase/mtr/mtr0log.cc
@@ -298,63 +298,38 @@ void mtr_t::log_write(const buf_block_t &block, byte *ptr, mlog_id_t l,
   mlog_close(this, log_ptr);
 }
 
-/********************************************************//**
-Writes a string to a file page buffered in the buffer pool. Writes the
-corresponding log record to the mini-transaction log. */
-void
-mlog_write_string(
-/*==============*/
-	byte*		ptr,	/*!< in: pointer where to write */
-	const byte*	str,	/*!< in: string to write */
-	ulint		len,	/*!< in: string length */
-	mtr_t*		mtr)	/*!< in: mini-transaction handle */
-{
-	ut_ad(ptr && mtr);
-	ut_a(len < srv_page_size);
-
-	memcpy(ptr, str, len);
-
-	mlog_log_string(ptr, len, mtr);
-}
-
-/********************************************************//**
-Logs a write of a string to a file page buffered in the buffer pool.
-Writes the corresponding log record to the mini-transaction log. */
-void
-mlog_log_string(
-/*============*/
-	byte*	ptr,	/*!< in: pointer written to */
-	ulint	len,	/*!< in: string length */
-	mtr_t*	mtr)	/*!< in: mini-transaction handle */
+/** Log a write of a byte string to a page.
+@param[in]      b       buffer page
+@param[in]      ofs     byte offset from b->frame
+@param[in]      str     the data to write
+@param[in]      len     length of the data to write */
+void mtr_t::memcpy(const buf_block_t &b, ulint ofs, ulint len)
 {
-	byte*	log_ptr;
-
-	ut_ad(ptr && mtr);
-	ut_ad(len <= srv_page_size);
-
-	log_ptr = mlog_open(mtr, 30);
-
-	/* If no logging is requested, we may return now */
-	if (log_ptr == NULL) {
-
-		return;
-	}
-
-	log_ptr = mlog_write_initial_log_record_fast(ptr, MLOG_WRITE_STRING,
-						     log_ptr, mtr);
-	mach_write_to_2(log_ptr, page_offset(ptr));
-	log_ptr += 2;
-
-	mach_write_to_2(log_ptr, len);
-	log_ptr += 2;
+  ut_ad(len);
+  ut_ad(ofs <= ulint(srv_page_size));
+  ut_ad(ofs + len <= ulint(srv_page_size));
+  ut_ad(ofs + len < PAGE_DATA || !b.page.zip.data ||
+        mach_read_from_2(b.frame + FIL_PAGE_TYPE) <= FIL_PAGE_TYPE_ZBLOB2);
 
-	mlog_close(mtr, log_ptr);
+  set_modified();
+  if (get_log_mode() != MTR_LOG_ALL)
+  {
+    ut_ad(get_log_mode() == MTR_LOG_NONE ||
+          get_log_mode() == MTR_LOG_NO_REDO);
+    return;
+  }
 
-	mlog_catenate_string(mtr, ptr, len);
+  byte *l= get_log()->open(11 + 2 + 2);
+  l= mlog_write_initial_log_record_low(MLOG_WRITE_STRING, b.page.id.space(),
+                                       b.page.id.page_no(), l, this);
+  mach_write_to_2(l, ofs);
+  mach_write_to_2(l + 2, len);
+  mlog_close(this, l + 4);
+  mlog_catenate_string(this, b.frame + ofs, len);
 }
 
 /********************************************************//**
-Parses a log record written by mlog_write_string.
+Parses a log record written by mtr_t::memcpy().
 @return parsed record end, NULL if not a complete record */
 const byte*
 mlog_parse_string(
diff --git a/storage/innobase/row/row0purge.cc b/storage/innobase/row/row0purge.cc
index 9636ba325dc..3361439bf6e 100644
--- a/storage/innobase/row/row0purge.cc
+++ b/storage/innobase/row/row0purge.cc
@@ -838,8 +838,15 @@ static void row_purge_reset_trx_id(purge_node_t* node, mtr_t* mtr)
 				byte*	ptr = rec_get_nth_field(
 					rec, offsets, trx_id_pos, &len);
 				ut_ad(len == DATA_TRX_ID_LEN);
-				mlog_write_string(ptr, reset_trx_id,
-						  sizeof reset_trx_id, mtr);
+				buf_block_t* block = btr_pcur_get_block(
+					&node->pcur);
+				uint16_t offs = page_offset(ptr);
+				mtr->memset(block, offs, DATA_TRX_ID_LEN, 0);
+				offs += DATA_TRX_ID_LEN;
+				mtr->write<1,mtr_t::OPT>(*block, block->frame
+							 + offs, 0x80U);
+				mtr->memset(block, offs + 1,
+					    DATA_ROLL_PTR_LEN - 1, 0);
 			}
 		}
 	}
diff --git a/storage/innobase/row/row0uins.cc b/storage/innobase/row/row0uins.cc
index f84bc33c525..b1c80d98399 100644
--- a/storage/innobase/row/row0uins.cc
+++ b/storage/innobase/row/row0uins.cc
@@ -226,8 +226,10 @@ func_exit:
 			static const byte str[8 + 8] = "supremuminfimum";
 			if (memcmp(infimum, str + 8, 8)
 			    || memcmp(supremum, str, 8)) {
-				mlog_write_string(infimum, str + 8, 8, &mtr);
-				mlog_write_string(supremum, str, 8, &mtr);
+				mtr.memcpy(root, page_offset(infimum),
+					   str + 8, 8);
+				mtr.memcpy(root, page_offset(supremum),
+					   str, 8);
 			}
 		}
 	}
diff --git a/storage/innobase/row/row0umod.cc b/storage/innobase/row/row0umod.cc
index 4775dc12348..0ecfa412938 100644
--- a/storage/innobase/row/row0umod.cc
+++ b/storage/innobase/row/row0umod.cc
@@ -156,26 +156,27 @@ row_undo_mod_clust_low(
 		    && node->ref == &trx_undo_metadata
 		    && btr_cur_get_index(btr_cur)->table->instant
 		    && node->update->info_bits == REC_INFO_METADATA_ADD) {
-			if (page_t* root = btr_root_get(
-				    btr_cur_get_index(btr_cur), mtr)) {
-				byte* infimum;
-				byte *supremum;
-				if (page_is_comp(root)) {
-					infimum = PAGE_NEW_INFIMUM + root;
-					supremum = PAGE_NEW_SUPREMUM + root;
+			if (buf_block_t* root = btr_root_block_get(
+				    btr_cur_get_index(btr_cur), RW_SX_LATCH,
+				    mtr)) {
+				uint16_t infimum, supremum;
+				if (page_is_comp(root->frame)) {
+					infimum = PAGE_NEW_INFIMUM;
+					supremum = PAGE_NEW_SUPREMUM;
 				} else {
-					infimum = PAGE_OLD_INFIMUM + root;
-					supremum = PAGE_OLD_SUPREMUM + root;
+					infimum = PAGE_OLD_INFIMUM;
+					supremum = PAGE_OLD_SUPREMUM;
 				}
 
-				ut_ad(!memcmp(infimum, INFIMUM, 8)
-				      == !memcmp(supremum, SUPREMUM, 8));
+				ut_ad(!memcmp(root->frame + infimum,
+					      INFIMUM, 8)
+				      == !memcmp(root->frame + supremum,
+						 SUPREMUM, 8));
 
-				if (memcmp(infimum, INFIMUM, 8)) {
-					mlog_write_string(infimum, INFIMUM,
-							  8, mtr);
-					mlog_write_string(supremum, SUPREMUM,
-							  8, mtr);
+				if (memcmp(root->frame + infimum, INFIMUM, 8)) {
+					mtr->memcpy(root, infimum, INFIMUM, 8);
+					mtr->memcpy(root, supremum, SUPREMUM,
+						    8);
 				}
 			}
 		}
@@ -457,7 +458,7 @@ row_undo_mod_clust(
 		if (trx_id_offset) {
 		} else if (rec_is_metadata(rec, *index)) {
 			ut_ad(!buf_block_get_page_zip(btr_pcur_get_block(
-							      &node->pcur)));
+							      pcur)));
 			for (unsigned i = index->first_user_field(); i--; ) {
 				trx_id_offset += index->fields[i].fixed_len;
 			}
@@ -479,15 +480,21 @@ row_undo_mod_clust(
 			      || rec_is_alter_metadata(rec, *index));
 			index->set_modified(mtr);
 			if (page_zip_des_t* page_zip = buf_block_get_page_zip(
-				    btr_pcur_get_block(&node->pcur))) {
+				    btr_pcur_get_block(pcur))) {
 				page_zip_write_trx_id_and_roll_ptr(
 					page_zip, rec, offsets, trx_id_pos,
 					0, 1ULL << ROLL_PTR_INSERT_FLAG_POS,
 					&mtr);
 			} else {
-				mlog_write_string(rec + trx_id_offset,
-						  reset_trx_id,
-						  sizeof reset_trx_id, &mtr);
+				buf_block_t* block = btr_pcur_get_block(pcur);
+				uint16_t offs = page_offset(rec
+							    + trx_id_offset);
+				mtr.memset(block, offs, DATA_TRX_ID_LEN, 0);
+				offs += DATA_TRX_ID_LEN;
+				mtr.write<1,mtr_t::OPT>(*block, block->frame
+							+ offs, 0x80U);
+				mtr.memset(block, offs + 1,
+					   DATA_ROLL_PTR_LEN - 1, 0);
 			}
 		}
 	} else {
diff --git a/storage/innobase/trx/trx0rseg.cc b/storage/innobase/trx/trx0rseg.cc
index 275b175b030..5302a6a7bf0 100644
--- a/storage/innobase/trx/trx0rseg.cc
+++ b/storage/innobase/trx/trx0rseg.cc
@@ -71,10 +71,8 @@ trx_rseg_write_wsrep_checkpoint(
 
 	const ulint xid_length = static_cast<ulint>(xid->gtrid_length
 						    + xid->bqual_length);
-	mlog_write_string(TRX_RSEG + TRX_RSEG_WSREP_XID_DATA
-			  + rseg_header->frame,
-			  reinterpret_cast<const byte*>(xid->data),
-			  xid_length, mtr);
+	mtr->memcpy(rseg_header, TRX_RSEG + TRX_RSEG_WSREP_XID_DATA,
+		    xid->data, xid_length);
 	if (UNIV_LIKELY(xid_length < XIDDATASIZE)) {
 		mtr->memset(rseg_header,
 			    TRX_RSEG + TRX_RSEG_WSREP_XID_DATA + xid_length,
@@ -787,11 +785,10 @@ void trx_rseg_update_binlog_offset(buf_block_t *rseg_header, const trx_t *trx,
 				 TRX_RSEG + TRX_RSEG_BINLOG_OFFSET
 				 + rseg_header->frame,
 				 trx->mysql_log_offset);
-	byte* p = TRX_RSEG + TRX_RSEG_BINLOG_NAME + rseg_header->frame;
-	const byte* binlog_name = reinterpret_cast<const byte*>
-		(trx->mysql_log_file_name);
 
-	if (memcmp(binlog_name, p, len)) {
-		mlog_write_string(p, binlog_name, len, mtr);
+	if (memcmp(trx->mysql_log_file_name, TRX_RSEG + TRX_RSEG_BINLOG_NAME
+		   + rseg_header->frame, len)) {
+		mtr->memcpy(rseg_header, TRX_RSEG + TRX_RSEG_BINLOG_NAME,
+			    trx->mysql_log_file_name, len);
 	}
 }
diff --git a/storage/innobase/trx/trx0undo.cc b/storage/innobase/trx/trx0undo.cc
index d6fc0da35d1..bcd21d7f250 100644
--- a/storage/innobase/trx/trx0undo.cc
+++ b/storage/innobase/trx/trx0undo.cc
@@ -597,9 +597,7 @@ static void trx_undo_write_xid(buf_block_t *block, uint16_t offset,
                            static_cast<uint32_t>(xid.bqual_length));
   const ulint xid_length= static_cast<ulint>(xid.gtrid_length
                                              + xid.bqual_length);
-  mlog_write_string(log_hdr + TRX_UNDO_XA_XID,
-                    reinterpret_cast<const byte*>(xid.data),
-                    xid_length, mtr);
+  mtr->memcpy(block, offset + TRX_UNDO_XA_XID, xid.data, xid_length);
   if (UNIV_LIKELY(xid_length < XIDDATASIZE))
     mtr->memset(block, offset + TRX_UNDO_XA_XID + xid_length,
                 XIDDATASIZE - xid_length, 0);