diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index f1c37d695051..431b82d57470 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -1568,8 +1568,11 @@ write:
 			err = do_write_data_page(&fio);
 		}
 	}
+
+	down_write(&F2FS_I(inode)->i_sem);
 	if (F2FS_I(inode)->last_disk_size < psize)
 		F2FS_I(inode)->last_disk_size = psize;
+	up_write(&F2FS_I(inode)->i_sem);
 
 done:
 	if (err && err != -ENOENT)
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 666e3ef1514b..668a32ce874b 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -2282,9 +2282,10 @@ static inline void clear_file(struct inode *inode, int type)
 
 static inline bool f2fs_skip_inode_update(struct inode *inode, int dsync)
 {
+	bool ret;
+
 	if (dsync) {
 		struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
-		bool ret;
 
 		spin_lock(&sbi->inode_lock[DIRTY_META]);
 		ret = list_empty(&F2FS_I(inode)->gdirty_list);
@@ -2295,7 +2296,12 @@ static inline bool f2fs_skip_inode_update(struct inode *inode, int dsync)
 			file_keep_isize(inode) ||
 			i_size_read(inode) & PAGE_MASK)
 		return false;
-	return F2FS_I(inode)->last_disk_size == i_size_read(inode);
+
+	down_read(&F2FS_I(inode)->i_sem);
+	ret = F2FS_I(inode)->last_disk_size == i_size_read(inode);
+	up_read(&F2FS_I(inode)->i_sem);
+
+	return ret;
 }
 
 static inline int f2fs_readonly(struct super_block *sb)
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 3a14a7214cf3..e240d789bd6f 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -758,6 +758,10 @@ int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
 			inode->i_mtime = inode->i_ctime = current_time(inode);
 		}
 
+		down_write(&F2FS_I(inode)->i_sem);
+		F2FS_I(inode)->last_disk_size = i_size_read(inode);
+		up_write(&F2FS_I(inode)->i_sem);
+
 		size_changed = true;
 	}