btrfs-progs: convert-test: trigger chunk allocation after convert

Populate fs after convert so we can trigger data chunk allocation.
This can expose too restrict old rollback condition

Reported-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>

tests/common

@@ -486,6 +486,10 @@ generate_dataset() {
 				run_check $SUDO_HELPER ln -s "$dirpath/$long_filename" "$dirpath/slow_slink.$num"
 			done
 			;;
+		large)
+			run_check $SUDO_HELPER dd if=/dev/urandom bs=32M count=1 \
+				of="$dirpath/$dataset_type" >/dev/null 2>&1
+			;;
 	esac
 }
 

tests/common.convert

@@ -160,6 +160,9 @@ convert_test_post_checks_all() {
 	convert_test_post_check_checksums "$1"
 	convert_test_post_check_permissions "$2"
 	convert_test_post_check_acl "$3"
+
+	# Create a large file to trigger data chunk allocation
+	generate_dataset "large"
 	run_check_umount_test_dev
 }