Non-functional change: Remove bogus const qualifiers

and make some function comments more accurate.

storage/innodb_plugin/btr/btr0cur.c

@@ -953,7 +953,7 @@ btr_cur_ins_lock_and_undo(
 				not zero, the parameters index and thr
 				should be specified */
 	btr_cur_t*	cursor,	/*!< in: cursor on page after which to insert */
-	const dtuple_t*	entry,	/*!< in: entry to insert */
+	dtuple_t*	entry,	/*!< in/out: entry to insert */
 	que_thr_t*	thr,	/*!< in: query thread or NULL */
 	mtr_t*		mtr,	/*!< in/out: mini-transaction */
 	ibool*		inherit)/*!< out: TRUE if the inserted new record maybe
@@ -3794,7 +3794,7 @@ Stores the fields in big_rec_vec to the tablespace and puts pointers to
 them in rec.  The extern flags in rec will have to be set beforehand.
 The fields are stored on pages allocated from leaf node
 file segment of the index tree.
-@return	DB_SUCCESS or error */
+@return	DB_SUCCESS or DB_OUT_OF_FILE_SPACE */
 UNIV_INTERN
 ulint
 btr_store_big_rec_extern_fields(

storage/innodb_plugin/include/btr0cur.h

@@ -520,7 +520,7 @@ Stores the fields in big_rec_vec to the tablespace and puts pointers to
 them in rec.  The extern flags in rec will have to be set beforehand.
 The fields are stored on pages allocated from leaf node
 file segment of the index tree.
-@return	DB_SUCCESS or error */
+@return	DB_SUCCESS or DB_OUT_OF_FILE_SPACE */
 UNIV_INTERN
 ulint
 btr_store_big_rec_extern_fields(

storage/innodb_plugin/include/row0ins.h

@@ -84,7 +84,7 @@ ulint
 row_ins_index_entry(
 /*================*/
 	dict_index_t*	index,	/*!< in: index */
-	dtuple_t*	entry,	/*!< in: index entry to insert */
+	dtuple_t*	entry,	/*!< in/out: index entry to insert */
 	ulint		n_ext,	/*!< in: number of externally stored columns */
 	ibool		foreign,/*!< in: TRUE=check foreign key constraints */
 	que_thr_t*	thr);	/*!< in: query thread */

storage/innodb_plugin/include/row0upd.h

@@ -126,8 +126,8 @@ UNIV_INTERN
 void
 row_upd_index_entry_sys_field(
 /*==========================*/
-	const dtuple_t*	entry,	/*!< in: index entry, where the memory buffers
-				for sys fields are already allocated:
+	dtuple_t*	entry,	/*!< in/out: index entry, where the memory
+				buffers for sys fields are already allocated:
 				the function just copies the new values to
 				them */
 	dict_index_t*	index,	/*!< in: clustered index */

storage/innodb_plugin/row/row0ins.c

@@ -1781,7 +1781,7 @@ ulint
 row_ins_duplicate_error_in_clust(
 /*=============================*/
 	btr_cur_t*	cursor,	/*!< in: B-tree cursor */
-	dtuple_t*	entry,	/*!< in: entry to insert */
+	const dtuple_t*	entry,	/*!< in: entry to insert */
 	que_thr_t*	thr,	/*!< in: query thread */
 	mtr_t*		mtr)	/*!< in: mtr */
 {
@@ -1977,7 +1977,7 @@ row_ins_index_entry_low(
 				depending on whether we wish optimistic or
 				pessimistic descent down the index tree */
 	dict_index_t*	index,	/*!< in: index */
-	dtuple_t*	entry,	/*!< in: index entry to insert */
+	dtuple_t*	entry,	/*!< in/out: index entry to insert */
 	ulint		n_ext,	/*!< in: number of externally stored columns */
 	que_thr_t*	thr)	/*!< in: query thread */
 {
@@ -2158,7 +2158,7 @@ ulint
 row_ins_index_entry(
 /*================*/
 	dict_index_t*	index,	/*!< in: index */
-	dtuple_t*	entry,	/*!< in: index entry to insert */
+	dtuple_t*	entry,	/*!< in/out: index entry to insert */
 	ulint		n_ext,	/*!< in: number of externally stored columns */
 	ibool		foreign,/*!< in: TRUE=check foreign key constraints */
 	que_thr_t*	thr)	/*!< in: query thread */

storage/innodb_plugin/row/row0upd.c

@@ -371,8 +371,8 @@ UNIV_INTERN
 void
 row_upd_index_entry_sys_field(
 /*==========================*/
-	const dtuple_t*	entry,	/*!< in: index entry, where the memory buffers
-				for sys fields are already allocated:
+	dtuple_t*	entry,	/*!< in/out: index entry, where the memory
+				buffers for sys fields are already allocated:
 				the function just copies the new values to
 				them */
 	dict_index_t*	index,	/*!< in: clustered index */
@@ -1587,12 +1587,12 @@ static
 ulint
 row_upd_clust_rec_by_insert(
 /*========================*/
-	upd_node_t*	node,	/*!< in: row update node */
+	upd_node_t*	node,	/*!< in/out: row update node */
 	dict_index_t*	index,	/*!< in: clustered index of the record */
 	que_thr_t*	thr,	/*!< in: query thread */
 	ibool		check_ref,/*!< in: TRUE if index may be referenced in
 				a foreign key constraint */
-	mtr_t*		mtr)	/*!< in: mtr; gets committed here */
+	mtr_t*		mtr)	/*!< in/out: mtr; gets committed here */
 {
 	mem_heap_t*	heap	= NULL;
 	btr_pcur_t*	pcur;