--- include/linux/fs.h

+++ include/linux/fs.h

@@ -2054,6 +2054,7 @@ static inline int thaw_bdev(struct block

}

#endif

extern int sync_filesystem(struct super_block *);

+extern void sync_filesystems(int wait);

extern const struct file_operations def_blk_fops;

extern const struct file_operations def_chr_fops;

extern const struct file_operations bad_sock_fops;