branches/zip: Minor cleanup.

buf_page_get_gen(): Cache the result of fil_space_get_zip_size().

trx_commit_off_kernel(): Eliminate the flag must_flush_log.  Initialize lsn = 0
to signify must_flush_log == FALSE.

log_flush_margin(): Eliminate the flag do_flush.  Initialize lsn = 0
to signify do_flush == FALSE.

buf/buf0buf.c

@@ -1484,6 +1484,7 @@ buf_page_get_gen(
 	ulint		fix_type;
 	ibool		success;
 	ibool		must_read;
+	const ulint	zip_size	= fil_space_get_zip_size(space);
 
 	ut_ad(mtr);
 	ut_ad((rw_latch == RW_S_LATCH)
@@ -1493,8 +1494,7 @@ buf_page_get_gen(
 	ut_ad((mode == BUF_GET) || (mode == BUF_GET_IF_IN_POOL)
 	      || (mode == BUF_GET_NO_LATCH) || (mode == BUF_GET_NOWAIT));
 #ifndef UNIV_LOG_DEBUG
-	ut_ad(!ibuf_inside()
-	      || ibuf_page(space, fil_space_get_zip_size(space), offset));
+	ut_ad(!ibuf_inside() || ibuf_page(space, zip_size, offset));
 #endif
 	buf_pool->n_page_gets++;
 loop:
@@ -1527,7 +1527,7 @@ buf_page_get_gen(
 			return(NULL);
 		}
 
-		buf_read_page(space, fil_space_get_zip_size(space), offset);
+		buf_read_page(space, zip_size, offset);
 
 #if defined UNIV_DEBUG || defined UNIV_BUF_DEBUG
 		ut_a(++buf_dbg_counter % 37 || buf_validate());
@@ -1636,8 +1636,7 @@ buf_page_get_gen(
 		/* In the case of a first access, try to apply linear
 		read-ahead */
 
-		buf_read_ahead_linear(space, buf_block_get_zip_size(block),
-				      offset);
+		buf_read_ahead_linear(space, zip_size, offset);
 	}
 
 #ifdef UNIV_IBUF_DEBUG

log/log0log.c

@@ -1536,9 +1536,8 @@ void
 log_flush_margin(void)
 /*==================*/
 {
-	ibool		do_flush	= FALSE;
 	log_t*		log	= log_sys;
-	ib_uint64_t	lsn;
+	ib_uint64_t	lsn	= 0;
 
 	mutex_enter(&(log->mutex));
 
@@ -1548,14 +1547,13 @@ log_flush_margin(void)
 			/* A flush is running: hope that it will provide enough
 			free space */
 		} else {
-			do_flush = TRUE;
 			lsn = log->lsn;
 		}
 	}
 
 	mutex_exit(&(log->mutex));
 
-	if (do_flush) {
+	if (lsn) {
 		log_write_up_to(lsn, LOG_NO_WAIT, FALSE);
 	}
 }

trx/trx0trx.c

@@ -743,10 +743,9 @@ trx_commit_off_kernel(
 	trx_t*	trx)	/* in: transaction */
 {
 	page_t*		update_hdr_page;
-	ib_uint64_t	lsn;
+	ib_uint64_t	lsn		= 0;
 	trx_rseg_t*	rseg;
 	trx_undo_t*	undo;
-	ibool		must_flush_log	= FALSE;
 	mtr_t		mtr;
 
 #ifdef UNIV_SYNC_DEBUG
@@ -763,8 +762,6 @@ trx_commit_off_kernel(
 
 		mtr_start(&mtr);
 
-		must_flush_log = TRUE;
-
 		/* Change the undo log segment states from TRX_UNDO_ACTIVE
 		to some other state: these modifications to the file data
 		structure define the transaction as committed in the file
@@ -883,7 +880,7 @@ trx_commit_off_kernel(
 
 	trx->read_view = NULL;
 
-	if (must_flush_log) {
+	if (lsn) {
 
 		mutex_exit(&kernel_mutex);