From patchwork Mon May 16 19:36:28 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 573847 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 9B398C433F5 for ; Mon, 16 May 2022 19:44:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345824AbiEPTo2 (ORCPT ); Mon, 16 May 2022 15:44:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45712 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344881AbiEPTm2 (ORCPT ); Mon, 16 May 2022 15:42:28 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 311543EF3C; Mon, 16 May 2022 12:40:49 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 88E81B81609; Mon, 16 May 2022 19:40:47 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D7931C385AA; Mon, 16 May 2022 19:40:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1652730046; bh=KRWbiZgITmESdQiqvs1TsjYhO72lj/nHP6anE80woqw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gQ9LHjvJJKYVl4MdRq+P9jk6lAMtinbULUxpLaFF1MJnPGV8pXBALx84u0beGwjLa 5lVeumCDHYSdOjXTx7qQTzfLvS5DqFXWVdQVdVMmUxP2K6FLmZIoEtwirBdcAxDRuK oN2ogvD0w/hWSDEGmr8fLy6/2OOBoPSTKSt5ryqc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Andreas Gruenbacher , Sasha Levin Subject: [PATCH 4.19 14/32] gfs2: Fix filesystem block deallocation for short writes Date: Mon, 16 May 2022 21:36:28 +0200 Message-Id: <20220516193615.197366539@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220516193614.773450018@linuxfoundation.org> References: <20220516193614.773450018@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Andreas Gruenbacher [ Upstream commit d031a8866e709c9d1ee5537a321b6192b4d2dc5b ] When a write cannot be carried out in full, gfs2_iomap_end() releases blocks that have been allocated for this write but haven't been used. To compute the end of the allocation, gfs2_iomap_end() incorrectly rounded the end of the attempted write down to the next block boundary to arrive at the end of the allocation. It would have to round up, but the end of the allocation is also available as iomap->offset + iomap->length, so just use that instead. In addition, use round_up() for computing the start of the unused range. Fixes: 64bc06bb32ee ("gfs2: iomap buffered write support") Signed-off-by: Andreas Gruenbacher Signed-off-by: Sasha Levin --- fs/gfs2/bmap.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c index 53ba5019ad06..150cec85c416 100644 --- a/fs/gfs2/bmap.c +++ b/fs/gfs2/bmap.c @@ -1168,13 +1168,12 @@ static int gfs2_iomap_end(struct inode *inode, loff_t pos, loff_t length, if (length != written && (iomap->flags & IOMAP_F_NEW)) { /* Deallocate blocks that were just allocated. */ - loff_t blockmask = i_blocksize(inode) - 1; - loff_t end = (pos + length) & ~blockmask; + loff_t hstart = round_up(pos + written, i_blocksize(inode)); + loff_t hend = iomap->offset + iomap->length; - pos = (pos + written + blockmask) & ~blockmask; - if (pos < end) { - truncate_pagecache_range(inode, pos, end - 1); - punch_hole(ip, pos, end - pos); + if (hstart < hend) { + truncate_pagecache_range(inode, hstart, hend - 1); + punch_hole(ip, hstart, hend - hstart); } }