kill generic_file_buffered_write()

extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *,

		unsigned long *, loff_t, size_t, size_t);

extern ssize_t generic_perform_write(struct file *, struct iov_iter *, loff_t);

extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *,

		unsigned long, loff_t, size_t, ssize_t);

extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos);

extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos);

extern int generic_segment_checks(const struct iovec *iov,

 *  ->mmap_sem

 *    ->lock_page		(access_process_vm)

 *

 *  ->i_mutex			(generic_file_buffered_write)

 *  ->i_mutex			(generic_perform_write)

 *    ->mmap_sem		(fault_in_pages_readable->do_page_fault)

 *

 *  bdi->wb.list_lock

}

EXPORT_SYMBOL(generic_perform_write);

ssize_t

generic_file_buffered_write(struct kiocb *iocb, const struct iovec *iov,

		unsigned long nr_segs, loff_t pos,

		size_t count, ssize_t written)

{

	struct file *file = iocb->ki_filp;

	ssize_t status;

	struct iov_iter i;

	iov_iter_init(&i, iov, nr_segs, count, written);

	status = generic_perform_write(file, &i, pos);

	if (likely(status >= 0)) {

		written += status;

		iocb->ki_pos = pos + status;

  	}

	return written ? written : status;

}

EXPORT_SYMBOL(generic_file_buffered_write);

/**

 * __generic_file_aio_write - write data to a file

 * @iocb:	IO state structure (file, offset, etc.)