splice: move inode size check into generic_file_splice_read()

Signed-off-by: NJens Axboe <jens.axboe@oracle.com>

fs/splice.c

@@ -478,10 +478,18 @@ ssize_t generic_file_splice_read(struct file *in, loff_t *ppos,
 {
 	ssize_t spliced;
 	int ret;
+	loff_t isize, left;
+
+	isize = i_size_read(in->f_mapping->host);
+	if (unlikely(*ppos >= isize))
+		return 0;
+
+	left = isize - *ppos;
+	if (unlikely(left < len))
+		len = left;
 
 	ret = 0;
 	spliced = 0;
-
 	while (len) {
 		ret = __generic_file_splice_read(in, ppos, pipe, len, flags);
 
@@ -922,7 +930,6 @@ static long do_splice_to(struct file *in, loff_t *ppos,
 			 struct pipe_inode_info *pipe, size_t len,
 			 unsigned int flags)
 {
-	loff_t isize, left;
 	int ret;
 
 	if (unlikely(!in->f_op || !in->f_op->splice_read))
@@ -935,14 +942,6 @@ static long do_splice_to(struct file *in, loff_t *ppos,
 	if (unlikely(ret < 0))
 		return ret;
 
-	isize = i_size_read(in->f_mapping->host);
-	if (unlikely(*ppos >= isize))
-		return 0;
-	
-	left = isize - *ppos;
-	if (unlikely(left < len))
-		len = left;
-
 	return in->f_op->splice_read(in, ppos, pipe, len, flags);
 }