[PATCH next] fs/splice: iter_to_pipe -- Use PIPE_DEF_BUFFERS instead of hardcoded number

[Cyrill Gorcunov <gorcunov@gmail.com>]

And use ARRAY_SIZE for easier code modification if we ever need in future.

CC: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
---
 fs/splice.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Index: linux-next.git/fs/splice.c
===================================================================
--- linux-next.git.orig/fs/splice.c
+++ linux-next.git/fs/splice.c
@@ -1203,12 +1203,12 @@ static int iter_to_pipe(struct iov_iter
 	bool failed = false;
 
 	while (iov_iter_count(from) && !failed) {
-		struct page *pages[16];
+		struct page *pages[PIPE_DEF_BUFFERS];
 		ssize_t copied;
 		size_t start;
 		int n;
 
-		copied = iov_iter_get_pages(from, pages, ~0UL, 16, &start);
+		copied = iov_iter_get_pages(from, pages, ~0UL, ARRAY_SIZE(pages), &start);
 		if (copied <= 0) {
 			ret = copied;
 			break;