diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c
index 85a291ccc1be..7fbd9fe1d035 100644
--- a/fs/nilfs2/ioctl.c
+++ b/fs/nilfs2/ioctl.c
@@ -41,6 +41,7 @@ static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
 						   void *, size_t, size_t))
 {
 	void *buf;
+	void __user *base = (void __user *)(unsigned long)argv->v_base;
 	size_t maxmembs, total, n;
 	ssize_t nr;
 	int ret, i;
@@ -64,9 +65,8 @@ static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
 		n = (argv->v_nmembs - i < maxmembs) ?
 			argv->v_nmembs - i : maxmembs;
 		if ((dir & _IOC_WRITE) &&
-		    copy_from_user(buf,
-			    (void __user *)argv->v_base + argv->v_size * i,
-			    argv->v_size * n)) {
+		    copy_from_user(buf, base + argv->v_size * i,
+				   argv->v_size * n)) {
 			ret = -EFAULT;
 			break;
 		}
@@ -78,9 +78,8 @@ static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
 			break;
 		}
 		if ((dir & _IOC_READ) &&
-		    copy_to_user(
-			    (void __user *)argv->v_base + argv->v_size * i,
-			    buf, argv->v_size * nr)) {
+		    copy_to_user(base + argv->v_size * i, buf,
+				 argv->v_size * nr)) {
 			ret = -EFAULT;
 			break;
 		}
diff --git a/include/linux/nilfs2_fs.h b/include/linux/nilfs2_fs.h
index b0a6b39eedbc..8fb64ce285fd 100644
--- a/include/linux/nilfs2_fs.h
+++ b/include/linux/nilfs2_fs.h
@@ -499,6 +499,7 @@ NILFS_CHECKPOINT_FNS(SKETCH, sketch)
 /**
  * struct nilfs_cpinfo - checkpoint information
  * @ci_flags: flags
+ * @ci_pad: padding
  * @ci_cno: checkpoint number
  * @ci_create: creation timestamp
  * @ci_nblk_inc: number of blocks incremented by this checkpoint
@@ -508,6 +509,7 @@ NILFS_CHECKPOINT_FNS(SKETCH, sketch)
  */
 struct nilfs_cpinfo {
 	__u32 ci_flags;
+	__u32 ci_pad;
 	__u64 ci_cno;
 	__u64 ci_create;
 	__u64 ci_nblk_inc;
@@ -668,7 +670,8 @@ enum {
  */
 struct nilfs_cpmode {
 	__u64 cm_cno;
-	int cm_mode;
+	__u32 cm_mode;
+	__u32 cm_pad;
 };
 
 /**
@@ -676,15 +679,15 @@ struct nilfs_cpmode {
  * @v_base:
  * @v_nmembs:
  * @v_size:
- * @v_index:
  * @v_flags:
+ * @v_index:
  */
 struct nilfs_argv {
-	void *v_base;
-	size_t v_nmembs;	/* number of members */
-	size_t v_size;		/* size of members */
-	int v_index;
-	int v_flags;
+	__u64 v_base;
+	__u32 v_nmembs;	/* number of members */
+	__u16 v_size;	/* size of members */
+	__u16 v_flags;
+	__u64 v_index;
 };
 
 /**
@@ -721,8 +724,8 @@ struct nilfs_sustat {
 	__u64 ss_nsegs;
 	__u64 ss_ncleansegs;
 	__u64 ss_ndirtysegs;
-	time_t ss_ctime;
-	time_t ss_nongc_ctime;
+	__u64 ss_ctime;
+	__u64 ss_nongc_ctime;
 };
 
 /**
@@ -750,6 +753,7 @@ struct nilfs_vdesc {
 	__u64 vd_blocknr;
 	__u64 vd_offset;
 	__u32 vd_flags;
+	__u32 vd_pad;
 };
 
 /**
@@ -761,6 +765,7 @@ struct nilfs_bdesc {
 	__u64 bd_blocknr;
 	__u64 bd_offset;
 	__u32 bd_level;
+	__u32 bd_pad;
 };
 
 #define NILFS_IOCTL_IDENT		'n'