From nobody Fri Jan 2 11:59:38 2026 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 CE136C46CA1 for ; Wed, 11 Oct 2023 20:12:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1376296AbjJKUMp (ORCPT ); Wed, 11 Oct 2023 16:12:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36718 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233353AbjJKUMn (ORCPT ); Wed, 11 Oct 2023 16:12:43 -0400 Received: from mail-pl1-x62b.google.com (mail-pl1-x62b.google.com [IPv6:2607:f8b0:4864:20::62b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9C0F59E for ; Wed, 11 Oct 2023 13:12:36 -0700 (PDT) Received: by mail-pl1-x62b.google.com with SMTP id d9443c01a7336-1c9b70b9656so1685435ad.1 for ; Wed, 11 Oct 2023 13:12:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1697055156; x=1697659956; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=rQNnXBnSwzfsN2zrI7/k3aUY1SO1WpMoDwjEZpkrIxM=; b=Yo4Q9xdIFr68Wucs1ifeWk5zzo6mpTk23PUK4877tDeNxUT6CDiDDdTOUGHGLNeMTR GBM7NgfKkr2feCVJQypkGgCDDHNkU6H7toLWftB1Q92P6gbcuutxH9NDa5WZjDWaIFg6 Ew+8TxPS2uFzCf/LZx7OBa1ncesTw7KwgK0Zg= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1697055156; x=1697659956; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=rQNnXBnSwzfsN2zrI7/k3aUY1SO1WpMoDwjEZpkrIxM=; b=l1umNgkABV6OVm+uu0hqH8e3OnOhteweSegvpFErzyDVyUTJd5PiUXU/OSOyExSxUv 3I/5DW22Bii9jib5J0gxqE3qF3ofcMs4Vty5msP+D5ZkLMu3pcY+El9IL0Q8rDLqjN3Y u94NrV1lSwOAGaJMkOLek7mr5G51dhkWsYJQaAvuOMpXozjQHSfEgrH2G0LgSwn2Hu0y xK3oR5SI3KyYhjoszjhvlAJFG9rdi+ePuUBPnACMj85cvrluOmwtaoAdH7s9mPFEvJJ6 HN2asb1OsP/W5hy/zk6yoozSFXLjQZmTU03x2MOj/+9PZ34dF/LDVk/ceEpbb7ytnvoP 7dHw== X-Gm-Message-State: AOJu0YwsrwhDeTSyc+xta7IEs3K+slF3RCtOINJmQMyu20hwNwJ/lO3q BkVd7vujtorVqBuYK2NFyKNOmg== X-Google-Smtp-Source: AGHT+IHnC5io+CLGcm9SFSID5XfybPMNO3Vqy63f8KprIuTpCwNwyaYRhoXL3YLKxVI+4yIF8orucA== X-Received: by 2002:a17:902:db10:b0:1bd:f7d7:3bcd with SMTP id m16-20020a170902db1000b001bdf7d73bcdmr21362238plx.50.1697055156027; Wed, 11 Oct 2023 13:12:36 -0700 (PDT) Received: from localhost ([2620:15c:9d:2:2c44:f765:835a:f6b3]) by smtp.gmail.com with UTF8SMTPSA id jc5-20020a17090325c500b001bf8779e051sm233685plb.289.2023.10.11.13.12.34 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 11 Oct 2023 13:12:35 -0700 (PDT) From: Sarthak Kukreti To: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Bart Van Assche , "Darrick J. Wong" , Jens Axboe , Sarthak Kukreti , stable@vger.kernel.org, "Darrick J . Wong" , Christoph Hellwig , Mike Snitzer Subject: [PATCH] block: Don't invalidate pagecache for invalid falloc modes Date: Wed, 11 Oct 2023 13:12:30 -0700 Message-ID: <20231011201230.750105-1-sarthakkukreti@chromium.org> X-Mailer: git-send-email 2.42.0.609.gbb76f46606-goog MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Only call truncate_bdev_range() if the fallocate mode is supported. This fixes a bug where data in the pagecache could be invalidated if the fallocate() was called on the block device with an invalid mode. Fixes: 25f4c41415e5 ("block: implement (some of) fallocate for block device= s") Cc: stable@vger.kernel.org Reported-by: Darrick J. Wong Signed-off-by: Sarthak Kukreti Reviewed-by: Christoph Hellwig Reviewed-by: Darrick J. Wong Signed-off-by: Mike Snitzer --- block/fops.c | 21 ++++++++++++++++----- 1 file changed, 16 insertions(+), 5 deletions(-) diff --git a/block/fops.c b/block/fops.c index acff3d5d22d4..73e42742543f 100644 --- a/block/fops.c +++ b/block/fops.c @@ -772,24 +772,35 @@ static long blkdev_fallocate(struct file *file, int m= ode, loff_t start, =20 filemap_invalidate_lock(inode->i_mapping); =20 - /* Invalidate the page cache, including dirty pages. */ - error =3D truncate_bdev_range(bdev, file_to_blk_mode(file), start, end); - if (error) - goto fail; - + /* + * Invalidate the page cache, including dirty pages, for valid + * de-allocate mode calls to fallocate(). + */ switch (mode) { case FALLOC_FL_ZERO_RANGE: case FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE: + error =3D truncate_bdev_range(bdev, file_to_blk_mode(file), start, end); + if (error) + goto fail; + error =3D blkdev_issue_zeroout(bdev, start >> SECTOR_SHIFT, len >> SECTOR_SHIFT, GFP_KERNEL, BLKDEV_ZERO_NOUNMAP); break; case FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE: + error =3D truncate_bdev_range(bdev, file_to_blk_mode(file), start, end); + if (error) + goto fail; + error =3D blkdev_issue_zeroout(bdev, start >> SECTOR_SHIFT, len >> SECTOR_SHIFT, GFP_KERNEL, BLKDEV_ZERO_NOFALLBACK); break; case FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE | FALLOC_FL_NO_HIDE_STALE: + error =3D truncate_bdev_range(bdev, file_to_blk_mode(file), start, end); + if (error) + goto fail; + error =3D blkdev_issue_discard(bdev, start >> SECTOR_SHIFT, len >> SECTOR_SHIFT, GFP_KERNEL); break; --=20 2.42.0.609.gbb76f46606-goog