Testsuite updates and fixes for recently added features.

1. Found bug in 'redundant log' implementation that caused
   problems when converting a linear that spanned multiple
   devices to a mirror (wasn't checking for NULL value of
   provided parameter in _alloc_parallel_area)

2. Testsuite was failing to perform tests when 'not' modifier
   was used.  This allowed a couple issues to slip through.
   Added a 'not_sh' modifier that negates tests performed by
   functions defined in the shell source file.

3. Was initializing a variable to far down, which cause
   previously set value to be overridden.  (This was the
   result of the collision of the "redundant log" and
   lvconvert fix patches.)

lib/metadata/lv_manip.c

@@ -762,7 +762,7 @@ static int _alloc_parallel_area(struct alloc_handle *ah, uint32_t needed,
 		consume_pv_area(areas[s], area_len);
 
 	for (i = 0, s = ah->area_count;
-	     (s < ah->area_count + ah->log_count);
+	     log_areas && (s < ah->area_count + ah->log_count);
 	     s++, i++) {
 		aa[s].pv = log_areas[i]->map->pv;
 		aa[s].pe = log_areas[i]->start;

test/t-mirror-lvconvert.sh

@@ -128,6 +128,12 @@ check_and_cleanup_lvs_()
 	fi
 }
 
+not_sh ()
+{
+    "$@" && exit 1 || :;
+}
+
+
 prepare_lvs_
 check_and_cleanup_lvs_
 
@@ -149,6 +155,19 @@ mimages_are_redundant_ $vg $lv1
 mirrorlog_is_on_ $vg/$lv1 $dev3
 check_and_cleanup_lvs_
 
+# remove 1 mirror from corelog'ed mirror
+#  should retain 'core' log type
+prepare_lvs_
+lvcreate -l2 -m2 --corelog -n $lv1 $vg
+check_mirror_count_ $vg/$lv1 3
+not_sh check_mirror_log_ $vg/$lv1
+lvconvert -m -1 -i1 $vg/$lv1
+check_no_tmplvs_ $vg/$lv1
+check_mirror_count_ $vg/$lv1 2
+mimages_are_redundant_ $vg $lv1
+not_sh check_mirror_log_ $vg/$lv1
+check_and_cleanup_lvs_
+
 # add 2 mirrors
 prepare_lvs_
 lvcreate -l2 -m1 -n $lv1 $vg $dev1 $dev2 $dev3:0-1
@@ -161,27 +180,41 @@ mimages_are_redundant_ $vg $lv1
 mirrorlog_is_on_ $vg/$lv1 $dev3
 check_and_cleanup_lvs_
 
-# add 1 mirror to core log mirror
+# add 1 mirror to core log mirror,
+#  explicitly keep log as 'core'
 prepare_lvs_
 lvcreate -l2 -m1 --mirrorlog core -n $lv1 $vg $dev1 $dev2
 check_mirror_count_ $vg/$lv1 2
-not check_mirror_log_ $vg/$lv1
+not_sh check_mirror_log_ $vg/$lv1
 lvconvert -m+1 -i1 --mirrorlog core $vg/$lv1 $dev4 
 check_no_tmplvs_ $vg/$lv1 
 check_mirror_count_ $vg/$lv1 3 
-not check_mirror_log_ $vg/$lv1
+not_sh check_mirror_log_ $vg/$lv1
 mimages_are_redundant_ $vg $lv1 
 check_and_cleanup_lvs_
 
+# add 1 mirror to core log mirror, but
+#  implicitly keep log as 'core'
+prepare_lvs_
+lvcreate -l2 -m1 --mirrorlog core -n $lv1 $vg $dev1 $dev2
+check_mirror_count_ $vg/$lv1 2
+not_sh check_mirror_log_ $vg/$lv1
+lvconvert -m +1 -i1 $vg/$lv1
+check_no_tmplvs_ $vg/$lv1
+check_mirror_count_ $vg/$lv1 3
+not_sh check_mirror_log_ $vg/$lv1
+mimages_are_redundant_ $vg $lv1
+check_and_cleanup_lvs_
+
 # add 2 mirrors to core log mirror" 
 prepare_lvs_ 
 lvcreate -l2 -m1 --mirrorlog core -n $lv1 $vg $dev1 $dev2 
 check_mirror_count_ $vg/$lv1 2 
-not check_mirror_log_ $vg/$lv1 
+not_sh check_mirror_log_ $vg/$lv1 
 lvconvert -m+2 -i1 --mirrorlog core $vg/$lv1 $dev4 $dev5 
 check_no_tmplvs_ $vg/$lv1 
 check_mirror_count_ $vg/$lv1 4 
-not check_mirror_log_ $vg/$lv1
+not_sh check_mirror_log_ $vg/$lv1
 mimages_are_redundant_ $vg $lv1 
 check_and_cleanup_lvs_
 
@@ -208,7 +241,7 @@ check_and_cleanup_lvs_
 prepare_lvs_ 
 lvcreate -l2 -m1 --mirrorlog core -n $lv1 $vg $dev1 $dev2 
 check_mirror_count_ $vg/$lv1 2 
-not check_mirror_log_ $vg/$lv1 
+not_sh check_mirror_log_ $vg/$lv1 
 lvconvert -m+1 --mirrorlog disk -i1 $vg/$lv1 $dev4 $dev3:0-1 
 check_no_tmplvs_ $vg/$lv1 
 check_mirror_count_ $vg/$lv1 3 

tools/lvconvert.c

@@ -613,7 +613,7 @@ static int _lvconvert_mirrors(struct cmd_context *cmd, struct logical_volume *lv
 	struct lv_segment *seg;
 	uint32_t existing_mirrors;
 	const char *mirrorlog;
-	unsigned log_count = 0;
+	unsigned log_count = 1;
 	int r = 0;
 	struct logical_volume *log_lv, *layer_lv;
 	int failed_mirrors = 0, failed_log = 0;
@@ -710,11 +710,6 @@ static int _lvconvert_mirrors(struct cmd_context *cmd, struct logical_volume *lv
 		/*
 		 * Adjust log type
 		 */
-		/*
-		 * This param used to be 'corelog' and was initialized to '0'.
-		 * We initially set to '1' here so as not to screw the logic.
-		 */
-		log_count = 1;
 		if (arg_count(cmd, corelog_ARG))
 			log_count = 0;