Commit 8e54cada authored Nov 26, 2016 by Al Viro

fix default_file_splice_read()



Botched calculation of number of pages.  As the result,
we were dropping pieces when doing splice to pipe from
e.g. 9p.

Reported-by: Alexei Starovoitov <ast@kernel.org>
Tested-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

parent 3ad0e83c

fs/splice.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -408,7 +408,8 @@ static ssize_t default_file_splice_read(struct file in, loff_t ppos,
		if (res <= 0)
		return -ENOMEM;

		nr_pages = res / PAGE_SIZE;
		BUG_ON(dummy);
		nr_pages = DIV_ROUND_UP(res, PAGE_SIZE);

		vec = __vec;
		if (nr_pages > PIPE_DEF_BUFFERS) {