Commit ef8e5717 authored by Matthew Wilcox's avatar Matthew Wilcox
Browse files

page cache: Convert delete_batch to XArray 



Rename the function from page_cache_tree_delete_batch to just
page_cache_delete_batch.

Signed-off-by: default avatarMatthew Wilcox <willy@infradead.org>
parent a332125f

mm/filemap.c

+13 −15
Original line number Diff line number Diff line
@@ -272,7 +272,7 @@ void delete_from_page_cache(struct page *page) 
EXPORT_SYMBOL(delete_from_page_cache);



/*

 * page_cache_tree_delete_batch - delete several pages from page cache

 * page_cache_delete_batch - delete several pages from page cache

 * @mapping: the mapping to which pages belong

 * @pvec: pagevec with pages to delete

 *
@@ -285,23 +285,18 @@ EXPORT_SYMBOL(delete_from_page_cache); 
 *

 * The function expects the i_pages lock to be held.

 */

static void

page_cache_tree_delete_batch(struct address_space *mapping,

static void page_cache_delete_batch(struct address_space *mapping,

			     struct pagevec *pvec)

{

	struct radix_tree_iter iter;

	void **slot;

	XA_STATE(xas, &mapping->i_pages, pvec->pages[0]->index);

	int total_pages = 0;

	int i = 0, tail_pages = 0;

	struct page *page;

	pgoff_t start;



	start = pvec->pages[0]->index;

	radix_tree_for_each_slot(slot, &mapping->i_pages, &iter, start) {

	mapping_set_update(&xas, mapping);

	xas_for_each(&xas, page, ULONG_MAX) {

		if (i >= pagevec_count(pvec) && !tail_pages)

			break;

		page = radix_tree_deref_slot_protected(slot,

						       &mapping->i_pages.xa_lock);

		if (xa_is_value(page))

			continue;

		if (!tail_pages) {
@@ -310,8 +305,11 @@ page_cache_tree_delete_batch(struct address_space *mapping, 
			 * have our pages locked so they are protected from

			 * being removed.

			 */

			if (page != pvec->pages[i])

			if (page != pvec->pages[i]) {

				VM_BUG_ON_PAGE(page->index >

						pvec->pages[i]->index, page);

				continue;

			}

			WARN_ON_ONCE(!PageLocked(page));

			if (PageTransHuge(page) && !PageHuge(page))

				tail_pages = HPAGE_PMD_NR - 1;
@@ -322,11 +320,11 @@ page_cache_tree_delete_batch(struct address_space *mapping, 
			 */

			i++;

		} else {

			VM_BUG_ON_PAGE(page->index + HPAGE_PMD_NR - tail_pages

					!= pvec->pages[i]->index, page);

			tail_pages--;

		}

		radix_tree_clear_tags(&mapping->i_pages, iter.node, slot);

		__radix_tree_replace(&mapping->i_pages, iter.node, slot, NULL,

				workingset_lookup_update(mapping));

		xas_store(&xas, NULL);

		total_pages++;

	}

	mapping->nrpages -= total_pages;
@@ -347,7 +345,7 @@ void delete_from_page_cache_batch(struct address_space *mapping, 


		unaccount_page_cache_page(mapping, pvec->pages[i]);

	}

	page_cache_tree_delete_batch(mapping, pvec);

	page_cache_delete_batch(mapping, pvec);

	xa_unlock_irqrestore(&mapping->i_pages, flags);



	for (i = 0; i < pagevec_count(pvec); i++)