progs: Add BTRFS_IOC_NODATASUM ioctl to progs

Index: btrfs-progs-unstable/btrfsctl.c
===================================================================
@@ -57,6 +57,7 @@ static void print_usage(void)
 	printf("\t-c: forces a single FS sync\n");
 	printf("\t--compress filename: sets compress flag on the file\n");
 	printf("\t--nodatacow filename: sets nodatacow flag on the file\n");
+	printf("\t--nodatasum filename: sets nodatasum flag on the file\n");
 	printf("%s\n", BTRFS_BUILD_VERSION);
 	exit(1);
 }

@@ -192,6 +193,12 @@ int main(int ac, char **av)
 				print_usage();
 			}
 			command = BTRFS_IOC_NODATACOW;
+		} else if (strcmp(av[i], "--nodatasum") == 0) {
+			if (i >= ac - 1) {
+				fprintf(stderr, "-r requires an arg\n");
+				print_usage();
+			}
+			command = BTRFS_IOC_NODATASUM;
 		}
 	}
 	if (command == 0) {

Index: btrfs-progs-unstable/ioctl.h
===================================================================
@@ -60,4 +60,6 @@ struct btrfs_ioctl_vol_args {
 			   struct btrfs_ioctl_vol_args)
 #define BTRFS_IOC_NODATACOW _IOW(BTRFS_IOCTL_MAGIC, 16, \
 			   struct btrfs_ioctl_vol_args)
+#define BTRFS_IOC_NODATASUM _IOW(BTRFS_IOCTL_MAGIC, 17, \
+			   struct btrfs_ioctl_vol_args)
 #endif