+ mm-use-pagevec_lookup_range_tag-in-__filemap_fdatawait_range.patch added to -mm tree

+ mm-use-pagevec_lookup_range_tag-in-__filemap_fdatawait_range.patch added to -mm tree

[akpm]

The patch titled
     Subject: mm: use pagevec_lookup_range_tag() in __filemap_fdatawait_range()
has been added to the -mm tree.  Its filename is
     mm-use-pagevec_lookup_range_tag-in-__filemap_fdatawait_range.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/mm-use-pagevec_lookup_range_tag-in-__filemap_fdatawait_range.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/mm-use-pagevec_lookup_range_tag-in-__filemap_fdatawait_range.patch

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------------------------------------------------------
From: Jan Kara <jack@suse.cz>
Subject: 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: Jan Kara <jack@suse.cz>
Reviewed-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/filemap.c |   14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff -puN mm/filemap.c~mm-use-pagevec_lookup_range_tag-in-__filemap_fdatawait_range mm/filemap.c
--- a/mm/filemap.c~mm-use-pagevec_lookup_range_tag-in-__filemap_fdatawait_range
+++ a/mm/filemap.c
@@ -420,19 +420,17 @@ static void __filemap_fdatawait_range(st
 		return;
 
 	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);
 			ClearPageError(page);
 		}
_

Patches currently in -mm which might be from jack@suse.cz are

mm-readahead-increase-maximum-readahead-window.patch
mm-implement-find_get_pages_range_tag.patch
btrfs-use-pagevec_lookup_range_tag.patch
ceph-use-pagevec_lookup_range_tag.patch
ext4-use-pagevec_lookup_range_tag.patch
f2fs-use-pagevec_lookup_range_tag.patch
f2fs-simplify-page-iteration-loops.patch
f2fs-use-find_get_pages_tag-for-looking-up-single-page.patch
gfs2-use-pagevec_lookup_range_tag.patch
nilfs2-use-pagevec_lookup_range_tag.patch
mm-use-pagevec_lookup_range_tag-in-__filemap_fdatawait_range.patch
mm-use-pagevec_lookup_range_tag-in-write_cache_pages.patch
mm-add-variant-of-pagevec_lookup_range_tag-taking-number-of-pages.patch
ceph-use-pagevec_lookup_range_nr_tag.patch
mm-remove-nr_pages-argument-from-pagevec_lookup_range_tag.patch
afs-use-find_get_pages_range_tag.patch
cifs-use-find_get_pages_range_tag.patch