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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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jan Kara 2017-11-15 17:35:05 -08:00 committed by Linus Torvalds
parent 40f9c51326
commit 312e9d2f70
1 changed files with 6 additions and 8 deletions
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14
mm/filemap.c
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@ -420,19 +420,17 @@ static void __filemap_fdatawait_range(struct address_space *mapping,
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);
}