iomap: use attach/detach_page_private (58aeb731) · Commits · 戴 / test

fs/iomap/buffered-io.c

+4 −15

Original line number	Diff line number	Diff line
		@@ -59,24 +59,19 @@ iomap_page_create(struct inode inode, struct page page)
		* migrate_page_move_mapping() assumes that pages with private data have
		* their count elevated by 1.
		*/
		get_page(page);
		set_page_private(page, (unsigned long)iop);
		SetPagePrivate(page);
		attach_page_private(page, iop);
		return iop;
		}

		static void
		iomap_page_release(struct page *page)
		{
		struct iomap_page *iop = to_iomap_page(page);
		struct iomap_page *iop = detach_page_private(page);

		if (!iop)
		return;
		WARN_ON_ONCE(atomic_read(&iop->read_count));
		WARN_ON_ONCE(atomic_read(&iop->write_count));
		ClearPagePrivate(page);
		set_page_private(page, 0);
		put_page(page);
		kfree(iop);
		}

		@@ -526,14 +521,8 @@ iomap_migrate_page(struct address_space mapping, struct page newpage,
		if (ret != MIGRATEPAGE_SUCCESS)
		return ret;

		if (page_has_private(page)) {
		ClearPagePrivate(page);
		get_page(newpage);
		set_page_private(newpage, page_private(page));
		set_page_private(page, 0);
		put_page(page);
		SetPagePrivate(newpage);
		}
		if (page_has_private(page))
		attach_page_private(newpage, detach_page_private(page));

		if (mode != MIGRATE_SYNC_NO_COPY)
		migrate_page_copy(newpage, page);