From patchwork Mon Sep 18 11:04:57 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hannes Reinecke X-Patchwork-Id: 13389458 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6E577CD3423 for ; Mon, 18 Sep 2023 11:06:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239806AbjIRLFy (ORCPT ); Mon, 18 Sep 2023 07:05:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58340 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234735AbjIRLFZ (ORCPT ); Mon, 18 Sep 2023 07:05:25 -0400 Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.220.29]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EF819FD; Mon, 18 Sep 2023 04:05:18 -0700 (PDT) Received: from relay2.suse.de (relay2.suse.de [149.44.160.134]) by smtp-out2.suse.de (Postfix) with ESMTP id 7BF781FDFF; Mon, 18 Sep 2023 11:05:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1695035117; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=JUAe4yzlD4Eoh42gjXbVpU2X4y7THkjmua5ySlekNfg=; b=1/tZ3PU6BLkKC52ewzLRI/ybegGD7vJNp3HGk9M2dQsQ9S2ozKGfrdXsPJd7nnlwFW53xN 4yYyTdqIdZmrg3+cnx0wPx2jVwwJwLAx6O74iyTrQ6jpBTIe7ARfZvk2DgadSNuTQUX2w5 r6q3hl9c4OzSl30+8JBtjjwZQR27tPg= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1695035117; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=JUAe4yzlD4Eoh42gjXbVpU2X4y7THkjmua5ySlekNfg=; b=Fi+IlHP27ptD5VAo6UDbEfvUpyN+KyyvjdD/tT1lKA25UBKjcr/89Ug8hBItC+lVe53Rrj BMfE2u5JpUfNmlDw== Received: from adalid.arch.suse.de (adalid.arch.suse.de [10.161.8.13]) by relay2.suse.de (Postfix) with ESMTP id 6347B2C153; Mon, 18 Sep 2023 11:05:17 +0000 (UTC) Received: by adalid.arch.suse.de (Postfix, from userid 16045) id 1265251CD147; Mon, 18 Sep 2023 13:05:17 +0200 (CEST) From: Hannes Reinecke To: Matthew Wilcox Cc: Luis Chamberlain , Christoph Hellwig , Jens Axboe , Pankaj Raghav , linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, Hannes Reinecke Subject: [PATCH 05/18] fs/mpage: use accessor function to translate page index to sectors Date: Mon, 18 Sep 2023 13:04:57 +0200 Message-Id: <20230918110510.66470-6-hare@suse.de> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20230918110510.66470-1-hare@suse.de> References: <20230918110510.66470-1-hare@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Use accessor functions to translate between page index and block sectors and ensure the resulting buffer size is calculated correctly. Signed-off-by: Hannes Reinecke --- fs/mpage.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) diff --git a/fs/mpage.c b/fs/mpage.c index c9d9fdadb500..26460afd829a 100644 --- a/fs/mpage.c +++ b/fs/mpage.c @@ -168,7 +168,7 @@ static struct bio *do_mpage_readpage(struct mpage_readpage_args *args) sector_t last_block; sector_t last_block_in_file; sector_t blocks[MAX_BUF_PER_PAGE]; - unsigned page_block; + unsigned num_blocks, page_block; unsigned first_hole = blocks_per_folio; struct block_device *bdev = NULL; int length; @@ -189,8 +189,12 @@ static struct bio *do_mpage_readpage(struct mpage_readpage_args *args) if (folio_buffers(folio)) goto confused; - block_in_file = (sector_t)folio->index << (PAGE_SHIFT - blkbits); - last_block = block_in_file + args->nr_pages * blocks_per_folio; + block_in_file = block_index_to_sector(folio->index, blkbits); + if (blkbits > PAGE_SHIFT) + num_blocks = args->nr_pages >> (blkbits - PAGE_SHIFT); + else + num_blocks = args->nr_pages * blocks_per_folio; + last_block = block_in_file + num_blocks; last_block_in_file = (i_size_read(inode) + blocksize - 1) >> blkbits; if (last_block > last_block_in_file) last_block = last_block_in_file; @@ -277,7 +281,7 @@ static struct bio *do_mpage_readpage(struct mpage_readpage_args *args) } if (first_hole != blocks_per_folio) { - folio_zero_segment(folio, first_hole << blkbits, PAGE_SIZE); + folio_zero_segment(folio, first_hole << blkbits, folio_size(folio)); if (first_hole == 0) { folio_mark_uptodate(folio); folio_unlock(folio); @@ -543,7 +547,7 @@ static int __mpage_writepage(struct folio *folio, struct writeback_control *wbc, * The page has no buffers: map it to disk */ BUG_ON(!folio_test_uptodate(folio)); - block_in_file = (sector_t)folio->index << (PAGE_SHIFT - blkbits); + block_in_file = block_index_to_sector(folio->index, blkbits); /* * Whole page beyond EOF? Skip allocating blocks to avoid leaking * space.