fs: unexport vfs_read and vfs_write

No modular users left. Given that they take user pointers there is no
good reason to export it to drivers to start with.

Signed-off-by: Christoph Hellwig <[e-mail]>
Signed-off-by: Al Viro <[e-mail]>

fs/read_write.c

···
 	return ret;
 }
 
-EXPORT_SYMBOL(vfs_read);
-
 static ssize_t new_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos)
 {
 	struct iovec iov = { .iov_base = (void __user *)buf, .iov_len = len };
···
 
 	return ret;
 }
-
-EXPORT_SYMBOL(vfs_write);
 
 static inline loff_t file_pos_read(struct file *file)
 {