configure: more deseralization & cleanup

Signed-off-by: Michal Rakowski <michal.rakowski@intel.com>

configure

@@ -64,8 +64,6 @@ generate_header() {
 		source $file "apply" "$CONF" "$file"
 	done
 
-	wait
-
 	for file in $SECOND; do
 		CONF=$(cat ${CONFIG_FILE} | grep $(basename $file) | cut -d' ' -f2)
 		source $file "apply" "$CONF" "$file"

configure.d/1_bio_err.conf

@@ -15,6 +15,11 @@ check() {
 	elif compile_module $cur_name "struct bio b;b.bi_error" "linux/bio.h"
 	then
 		echo $cur_name "2" >> $config_file_path
+	elif compile_module $cur_name "bio_endio(NULL, 0)" "linux/bio.h"
+	then
+		echo $cur_name "3" >> $config_file_path
+	else
+		echo $cur_name "X" >> $config_file_path
 	fi
 }
 
@@ -26,6 +31,10 @@ apply() {
     "2")
 		add_define "CAS_BIO_OP_STATUS(bio) \\
 			bio->bi_error" ;;
+    "3")
+	        # If bio_endio is available, we do not need to provide our own status accessors.
+	        # This case-switch prevents false errors during executing 'configure' script.
+	    	return 0 ;;
     *)
         exit 1
     esac

configure.d/1_wtlh.conf

@@ -12,6 +12,8 @@ check() {
 	if compile_module $cur_name "struct bio b;b.bi_write_hint" "linux/bio.h"
 	then
 		echo $cur_name "1" >> $config_file_path
+	else
+		echo $cur_name "2" >> $config_file_path
 	fi
 }
 
@@ -20,6 +22,8 @@ apply() {
 	"1")
 		add_define "CAS_WLTH_SUPPORT \\
 			1" ;;
+	"2")
+		return 0 ;;
 	*)
 		exit 1
 	esac

configure.d/conf_framework

@@ -73,10 +73,14 @@ kernel_not_supp_fail() {
 # $2 - path to file with valid configs
 # $3 - name of processed template file
 conf_run() {
+	local OLD_IFS=$IFS
+	IFS='?'
+
 	case "$1" in
 		"check") check $2 $3;;
 		"apply") apply $2 ;;
 	esac
+
+	IFS=$OLD_IFS
 }
 
-IFS='?'