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.

storage/innobase/btr/btr0btr.cc

@@ -1627,15 +1627,11 @@ btr_page_reorganize_low(
 					    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);
 		}
 	}
 

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 @@ btr_store_big_rec_extern_fields(
 					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);

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();

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);
 	}
 }
 

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

storage/innobase/include/mtr0log.h

@@ -33,26 +33,6 @@ Created 12/7/1995 Heikki Tuuri
 // Forward declaration
 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
@@ -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(

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

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(

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);
 			}
 		}
 	}

storage/innobase/row/row0uins.cc

@@ -226,8 +226,10 @@ row_undo_ins_remove_clust_rec(
 			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);
 			}
 		}
 	}