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filemap: Convert filemap_get_read_batch to use folios 

The page cache only stores folios, never tail pages.  Saves 29 bytes
due to removing calls to compound_head().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
This commit is contained in:
Matthew Wilcox (Oracle) 2021-03-05 10:29:41 -05:00
parent bb2e98b613
commit bdb7293297
1 changed files with 11 additions and 12 deletions
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23
mm/filemap.c
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@ -2339,32 +2339,31 @@ static void filemap_get_read_batch(struct address_space *mapping,
pgoff_t index, pgoff_t max, struct pagevec *pvec)
{
XA_STATE(xas, &mapping->i_pages, index);
struct page *head;
struct folio *folio;
rcu_read_lock();
for (head = xas_load(&xas); head; head = xas_next(&xas)) {
if (xas_retry(&xas, head))
for (folio = xas_load(&xas); folio; folio = xas_next(&xas)) {
if (xas_retry(&xas, folio))
continue;
if (xas.xa_index > max || xa_is_value(head))
if (xas.xa_index > max || xa_is_value(folio))
break;
if (!page_cache_get_speculative(head))
if (!folio_try_get_rcu(folio))
goto retry;
/* Has the page moved or been split? */
if (unlikely(head != xas_reload(&xas)))
if (unlikely(folio != xas_reload(&xas)))
goto put_page;
if (!pagevec_add(pvec, head))
if (!pagevec_add(pvec, &folio->page))
break;
if (!PageUptodate(head))
if (!folio_test_uptodate(folio))
break;
if (PageReadahead(head))
if (folio_test_readahead(folio))
break;
xas.xa_index = head->index + thp_nr_pages(head) - 1;
xas.xa_index = folio->index + folio_nr_pages(folio) - 1;
xas.xa_offset = (xas.xa_index >> xas.xa_shift) & XA_CHUNK_MASK;
continue;
put_page:
put_page(head);
folio_put(folio);
retry:
xas_reset(&xas);
}