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Commit 027f74ce authored by Jan Kara's avatar Jan Kara Committed by Jaegeuk Kim
Browse files

mm: use pagevec_lookup_range_tag() in __filemap_fdatawait_range() 

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.

Link: http://lkml.kernel.org/r/20171009151359.31984-11-jack@suse.cz


Signed-off-by: default avatarJan Kara <jack@suse.cz>
Reviewed-by: default avatarDaniel Jordan <daniel.m.jordan@oracle.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent fe9d861b

mm/filemap.c

+6 −8
Original line number Diff line number Diff line
@@ -341,19 +341,17 @@ int filemap_fdatawait_range(struct address_space *mapping, loff_t start_byte, 
		goto out;



	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) {

	while (index <= end) {

		unsigned i;



		nr_pages = pagevec_lookup_range_tag(&pvec, mapping, &index,

				end, PAGECACHE_TAG_WRITEBACK, PAGEVEC_SIZE);

		if (!nr_pages)

			break;



		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;