branches/innodb+: Merge revisions 4063:4070 from branches/zip:

  ------------------------------------------------------------------------
  r4070 | marko | 2009-01-30 12:58:56 +0200 (Fri, 30 Jan 2009) | 6 lines

  branches/zip: ibuf_use_t: Add the constant IBUF_USE_COUNT, to eliminate
  a gcc warning about an assertion that trivially holds.
  The warning was introduced in r4061, in the merge of
  branches/innodb+ -r4053.

  ibuf_insert(): Let an assertion fail if ibuf_use is unknown.
  ------------------------------------------------------------------------

handler/ha_innodb.cc

@@ -188,7 +188,7 @@ bool nw_panic = FALSE;
 #endif
 
 /** Allowed values of innodb_change_buffering */
-static const char* innobase_change_buffering_values[IBUF_USE_ALL + 1] = {
+static const char* innobase_change_buffering_values[IBUF_USE_COUNT] = {
 	"none",		/* IBUF_USE_NONE */
 	"inserts",	/* IBUF_USE_INSERT */
 	"deletes",	/* IBUF_USE_DELETE_MARK */
@@ -9432,7 +9432,7 @@ innodb_change_buffering_update(
 {
 	ut_a(var_ptr != NULL);
 	ut_a(save != NULL);
-	ut_a((*(ibuf_use_t*) save) <= IBUF_USE_ALL);
+	ut_a((*(ibuf_use_t*) save) < IBUF_USE_COUNT);
 
 	ibuf_use = *(const ibuf_use_t*) save;
 

ibuf/ibuf0ibuf.c

@@ -3533,6 +3533,8 @@ ibuf_insert(
 		case IBUF_USE_INSERT:
 		case IBUF_USE_INSERT_DELETE_MARK:
 		case IBUF_USE_ALL:
+			goto notify;
+		case IBUF_USE_COUNT:
 			break;
 		}
 		break;
@@ -3545,9 +3547,11 @@ ibuf_insert(
 		case IBUF_USE_DELETE:
 		case IBUF_USE_INSERT_DELETE_MARK:
 		case IBUF_USE_ALL:
+			ut_ad(!no_counter);
+			goto notify;
+		case IBUF_USE_COUNT:
 			break;
 		}
-		ut_ad(!no_counter);
 		break;
 	case IBUF_OP_DELETE:
 		switch (use) {
@@ -3558,14 +3562,20 @@ ibuf_insert(
 		case IBUF_USE_DELETE_MARK:
 		case IBUF_USE_DELETE:
 		case IBUF_USE_ALL:
+			ut_ad(!no_counter);
+			goto skip_notify;
+		case IBUF_USE_COUNT:
 			break;
 		}
-		ut_ad(!no_counter);
-		goto skip_notify;
-	default:
-		ut_error;
+		break;
+	case IBUF_OP_COUNT:
+		break;
 	}
 
+	/* unknown op or use */
+	ut_error;
+
+notify:
 	/* If another thread buffers an insert on a page while
 	the purge is in progress, the purge for the same page
 	must not be buffered, because it could remove a record

include/ibuf0ibuf.h

@@ -28,14 +28,18 @@ typedef enum {
 	IBUF_OP_COUNT = 3,
 } ibuf_op_t;
 
-/** Combinations of operations that can be buffered. */
+/** Combinations of operations that can be buffered.  Because the enum
+values are used for indexing innobase_change_buffering_values[], they
+should start at 0 and there should not be any gaps. */
 typedef enum {
 	IBUF_USE_NONE = 0,
 	IBUF_USE_INSERT,	/* insert */
 	IBUF_USE_DELETE_MARK,	/* delete */
 	IBUF_USE_INSERT_DELETE_MARK,	/* insert+delete */
 	IBUF_USE_DELETE,	/* delete+purge */
-	IBUF_USE_ALL		/* insert+delete+purge */
+	IBUF_USE_ALL,		/* insert+delete+purge */
+
+	IBUF_USE_COUNT		/* number of entries in ibuf_use_t */
 } ibuf_use_t;
 
 /** Operations that can currently be buffered. */