ceph: use pagevec_lookup_range_nr_tag()

Use new function for looking up pages since nr_pages argument from
pagevec_lookup_range_tag() is going away.

Link: http://lkml.kernel.org/r/20171009151359.31984-14-jack@suse.cz
Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Reviewed-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/ceph/addr.c

@@ -870,11 +870,9 @@ static int ceph_writepages_start(struct address_space *mapping,
 		max_pages = wsize >> PAGE_SHIFT;
 
 get_more_pages:
-		pvec_pages = min_t(unsigned, PAGEVEC_SIZE,
-				   max_pages - locked_pages);
-		pvec_pages = pagevec_lookup_range_tag(&pvec, mapping, &index,
+		pvec_pages = pagevec_lookup_range_nr_tag(&pvec, mapping, &index,
 						end, PAGECACHE_TAG_DIRTY,
-						pvec_pages);
+						max_pages - locked_pages);
 		dout("pagevec_lookup_range_tag got %d\n", pvec_pages);
 		if (!pvec_pages && !locked_pages)
 			break;