[PATCH 23/35] mm: Use pagevec_lookup_range_tag() in __filemap_fdatawait_range()

[Jan Kara <jack@suse.cz>]

Use pagevec_lookup_range_tag() in __filemap_fdatawait_range() as it is
interested only in pages from given range. Remove unnecessary code
resulting from this.

Signed-off-by: Jan Kara <jack@suse.cz>
---
 mm/filemap.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/mm/filemap.c b/mm/filemap.c
index 56af68f6a375..8039b6bb9c27 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -390,18 +390,13 @@ static int __filemap_fdatawait_range(struct address_space *mapping,
 
 	pagevec_init(&pvec, 0);
 	while ((index <= end) &&
-			(nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
-			PAGECACHE_TAG_WRITEBACK,
-			min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1)) != 0) {
+			(nr_pages = pagevec_lookup_range_tag(&pvec, mapping,
+			&index, end, PAGECACHE_TAG_WRITEBACK, PAGEVEC_SIZE))) {
 		unsigned i;
 
 		for (i = 0; i < nr_pages; i++) {
 			struct page *page = pvec.pages[i];
 
-			/* until radix tree lookup accepts end_index */
-			if (page->index > end)
-				continue;
-
 			wait_on_page_writeback(page);
 			if (TestClearPageError(page))
 				ret = -EIO;
-- 
2.12.3