From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 931EBC07E9B for ; Mon, 12 Jul 2021 04:09:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7978660E09 for ; Mon, 12 Jul 2021 04:09:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230182AbhGLEMO (ORCPT ); Mon, 12 Jul 2021 00:12:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53432 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229660AbhGLEMN (ORCPT ); Mon, 12 Jul 2021 00:12:13 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EFA87C0613DD; Sun, 11 Jul 2021 21:09:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=env8JtTyHLXMweYSKCqbbZbzTREIpIydQ3IyZXJU3Gw=; b=hLL76wGU2E7UZSvjMWqV3nmX4a xodl1HHRLYVWiFwgVcafT1cWSia/WpEkbaXURFa5TuWvGmbjci266g6ZDyim2uuyTcZv8NQ04TLH+ zqxZJS13Cv1r3yldIs33LnZDTRaqa+ONSuXzQsBQx9MX5/5ENbWBw//k6cEkmDhK/GvjPKsqtYjAK lqHdTIne5D1kqfEtAUCGdzeZxpuq/rYk6Oo6clbewLRvB6iMfDxMolUBPp5s9tceXhhYLwH6Cr4D9 nUUHr0M8mj6oV5DQSnzgAL+kGlluatN/9uF+u5jyLzqUw88c268SePbxSYwJCjNMQ6EjLZQbWQAkX OTRXuXDQ==; Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1m2nF0-00Gr8i-PQ; Mon, 12 Jul 2021 04:08:28 +0000 From: "Matthew Wilcox (Oracle)" To: linux-kernel@vger.kernel.org Cc: "Matthew Wilcox (Oracle)" , linux-mm@kvack.org, linux-fsdevel@vger.kernel.org Subject: [PATCH v13 117/137] mm/filemap: Add read_cache_folio and read_mapping_folio Date: Mon, 12 Jul 2021 04:06:41 +0100 Message-Id: <20210712030701.4000097-118-willy@infradead.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210712030701.4000097-1-willy@infradead.org> References: <20210712030701.4000097-1-willy@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Reimplement read_cache_page() as a wrapper around read_cache_folio(). Saves over 400 bytes of text from do_read_cache_folio() which more thn makes up for the extra 100 bytes of text added to the various wrapper functions. Signed-off-by: Matthew Wilcox (Oracle) --- include/linux/pagemap.h | 12 +++++- mm/filemap.c | 95 +++++++++++++++++++++-------------------- 2 files changed, 59 insertions(+), 48 deletions(-) diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index 58d86679b92f..e7539da390d2 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -539,8 +539,10 @@ static inline struct page *grab_cache_page(struct address_space *mapping, return find_or_create_page(mapping, index, mapping_gfp_mask(mapping)); } -extern struct page * read_cache_page(struct address_space *mapping, - pgoff_t index, filler_t *filler, void *data); +struct folio *read_cache_folio(struct address_space *, pgoff_t index, + filler_t *filler, void *data); +struct page *read_cache_page(struct address_space *, pgoff_t index, + filler_t *filler, void *data); extern struct page * read_cache_page_gfp(struct address_space *mapping, pgoff_t index, gfp_t gfp_mask); extern int read_cache_pages(struct address_space *mapping, @@ -552,6 +554,12 @@ static inline struct page *read_mapping_page(struct address_space *mapping, return read_cache_page(mapping, index, NULL, data); } +static inline struct folio *read_mapping_folio(struct address_space *mapping, + pgoff_t index, void *data) +{ + return read_cache_folio(mapping, index, NULL, data); +} + /* * Get index of the page within radix-tree (but not for hugetlb pages). * (TODO: remove once hugetlb pages will have ->index in PAGE_SIZE) diff --git a/mm/filemap.c b/mm/filemap.c index cd32f57aecc6..b7fb0a4479ea 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -3298,35 +3298,20 @@ EXPORT_SYMBOL(filemap_page_mkwrite); EXPORT_SYMBOL(generic_file_mmap); EXPORT_SYMBOL(generic_file_readonly_mmap); -static struct page *wait_on_page_read(struct page *page) +static struct folio *do_read_cache_folio(struct address_space *mapping, + pgoff_t index, filler_t filler, void *data, gfp_t gfp) { - if (!IS_ERR(page)) { - wait_on_page_locked(page); - if (!PageUptodate(page)) { - put_page(page); - page = ERR_PTR(-EIO); - } - } - return page; -} - -static struct page *do_read_cache_page(struct address_space *mapping, - pgoff_t index, - int (*filler)(void *, struct page *), - void *data, - gfp_t gfp) -{ - struct page *page; + struct folio *folio; int err; repeat: - page = find_get_page(mapping, index); - if (!page) { - page = __page_cache_alloc(gfp); - if (!page) + folio = filemap_get_folio(mapping, index); + if (!folio) { + folio = filemap_alloc_folio(gfp, 0); + if (!folio) return ERR_PTR(-ENOMEM); - err = add_to_page_cache_lru(page, mapping, index, gfp); + err = filemap_add_folio(mapping, folio, index, gfp); if (unlikely(err)) { - put_page(page); + folio_put(folio); if (err == -EEXIST) goto repeat; /* Presumably ENOMEM for xarray node */ @@ -3335,21 +3320,24 @@ static struct page *do_read_cache_page(struct address_space *mapping, filler: if (filler) - err = filler(data, page); + err = filler(data, &folio->page); else - err = mapping->a_ops->readpage(data, page); + err = mapping->a_ops->readpage(data, &folio->page); if (err < 0) { - put_page(page); + folio_put(folio); return ERR_PTR(err); } - page = wait_on_page_read(page); - if (IS_ERR(page)) - return page; + folio_wait_locked(folio); + if (!folio_uptodate(folio)) { + folio_put(folio); + return ERR_PTR(-EIO); + } + goto out; } - if (PageUptodate(page)) + if (folio_uptodate(folio)) goto out; /* @@ -3383,23 +3371,23 @@ static struct page *do_read_cache_page(struct address_space *mapping, * avoid spurious serialisations and wakeups when multiple processes * wait on the same page for IO to complete. */ - wait_on_page_locked(page); - if (PageUptodate(page)) + folio_wait_locked(folio); + if (folio_uptodate(folio)) goto out; /* Distinguish between all the cases under the safety of the lock */ - lock_page(page); + folio_lock(folio); /* Case c or d, restart the operation */ - if (!page->mapping) { - unlock_page(page); - put_page(page); + if (!folio->mapping) { + folio_unlock(folio); + folio_put(folio); goto repeat; } /* Someone else locked and filled the page in a very small window */ - if (PageUptodate(page)) { - unlock_page(page); + if (folio_uptodate(folio)) { + folio_unlock(folio); goto out; } @@ -3409,16 +3397,16 @@ static struct page *do_read_cache_page(struct address_space *mapping, * Clear page error before actual read, PG_error will be * set again if read page fails. */ - ClearPageError(page); + folio_clear_error_flag(folio); goto filler; out: - mark_page_accessed(page); - return page; + folio_mark_accessed(folio); + return folio; } /** - * read_cache_page - read into page cache, fill it if needed + * read_cache_folio - read into page cache, fill it if needed * @mapping: the page's address_space * @index: the page index * @filler: function to perform the read @@ -3431,10 +3419,25 @@ static struct page *do_read_cache_page(struct address_space *mapping, * * Return: up to date page on success, ERR_PTR() on failure. */ +struct folio *read_cache_folio(struct address_space *mapping, pgoff_t index, + filler_t filler, void *data) +{ + return do_read_cache_folio(mapping, index, filler, data, + mapping_gfp_mask(mapping)); +} +EXPORT_SYMBOL(read_cache_folio); + +static struct page *do_read_cache_page(struct address_space *mapping, + pgoff_t index, filler_t *filler, void *data, gfp_t gfp) +{ + struct folio *folio = read_cache_folio(mapping, index, filler, data); + if (IS_ERR(folio)) + return &folio->page; + return folio_file_page(folio, index); +} + struct page *read_cache_page(struct address_space *mapping, - pgoff_t index, - int (*filler)(void *, struct page *), - void *data) + pgoff_t index, filler_t *filler, void *data) { return do_read_cache_page(mapping, index, filler, data, mapping_gfp_mask(mapping)); -- 2.30.2