From patchwork Thu Jul 15 13:40:24 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jan Kara X-Patchwork-Id: 12380167 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,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 E049CC47E5D for ; Thu, 15 Jul 2021 13:40:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C6631613C7 for ; Thu, 15 Jul 2021 13:40:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237921AbhGONnj (ORCPT ); Thu, 15 Jul 2021 09:43:39 -0400 Received: from smtp-out2.suse.de ([195.135.220.29]:59720 "EHLO smtp-out2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237209AbhGONn2 (ORCPT ); Thu, 15 Jul 2021 09:43:28 -0400 Received: from relay2.suse.de (relay2.suse.de [149.44.160.134]) by smtp-out2.suse.de (Postfix) with ESMTP id 8C5E920303; Thu, 15 Jul 2021 13:40:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1626356433; 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=aHhQqe8KTjBCv9r4mi6xe2At5YRjoevCFxA6zjCOvEc=; b=RuJfucQ18UcdWSlSoKBS0R02LQqU1/2ikN5fVOsUopTm5nVBDrhxzwoexmEPqEfDpiFR/f h+qcLI/KXCIM5K9dG6BkjTUF9Jd4Z85o20OQyK28wK2Z/X0BOJ8jCdlBKz20WHBt1bCCVb moM3VmI061wTH+Chtl1RODrrlZNEyR0= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1626356433; 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=aHhQqe8KTjBCv9r4mi6xe2At5YRjoevCFxA6zjCOvEc=; b=okfc6hssx0z1h1XKdCgUrgiqbuGqpuR+6jkXPziR0sbZUxXCsDdVf5LpJxwHEQW8SJ8h69 h5gs7zxRdmnrUeCg== Received: from quack2.suse.cz (unknown [10.100.200.198]) by relay2.suse.de (Postfix) with ESMTP id 75781A3B9B; Thu, 15 Jul 2021 13:40:33 +0000 (UTC) Received: by quack2.suse.cz (Postfix, from userid 1000) id 34DDA1E110A; Thu, 15 Jul 2021 15:40:33 +0200 (CEST) From: Jan Kara To: Cc: , Christoph Hellwig , "Darrick J. Wong" , Ted Tso , Dave Chinner , Matthew Wilcox , , , linux-f2fs-devel@lists.sourceforge.net, linux-cifs@vger.kernel.org, ceph-devel@vger.kernel.org, Jan Kara , Steve French Subject: [PATCH 14/14] cifs: Fix race between hole punch and page fault Date: Thu, 15 Jul 2021 15:40:24 +0200 Message-Id: <20210715134032.24868-14-jack@suse.cz> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210715133202.5975-1-jack@suse.cz> References: <20210715133202.5975-1-jack@suse.cz> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1533; h=from:subject; bh=1e9BARQoajJDSgUdYORenFPF3ecMZ7Jduf79ehs8h7w=; b=owGbwMvMwME4Z+4qdvsUh5uMp9WSGBI+WB1n1Ns3Y96Kydy5/1TSyzp5XkorV0pMDjoluy51bumy pHq5TkZjFgZGDgZZMUWW1ZEXta/NM+raGqohAzOIlQlkCgMXpwBMZOcODoZWJVaREsa87UFlLCyKym 6Jz7/Om7Llk3eCg4bKo9Mz5yQv57j/oybvSLtrzHthh0TB2CtnGXOMp2jfvbtdVV/OezJjU7votVnG llXaMuz16cwaKVErlmcwc4VzuIdkbl1902Oq6ZOkT8+s+dUE8pe2Nt9tuBa4U21Oycx5efGnpy855L RFINhWyEgzMmXDxUCTm0cq2aS+nGqerlR/7EpmjLGTVcWK6GtLV8TYd8XMF9/G6rZlz8qXj1k/yy04 L/70Rm151ZWv8u8jkhOtnzn1qzf+lBRWTmXmyBF9tOJVo+OL20Kxc9zFGqZFbTe1Tpx7f6aT79Rz5+ KYW3iC+t5EbhGRPfjkj5xdzfJSAA== X-Developer-Key: i=jack@suse.cz; a=openpgp; fpr=93C6099A142276A28BBE35D815BC833443038D8C Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org Cifs has a following race between hole punching and page fault: CPU1 CPU2 smb3_fallocate() smb3_punch_hole() truncate_pagecache_range() filemap_fault() - loads old data into the page cache SMB2_ioctl(..., FSCTL_SET_ZERO_DATA, ...) And now we have stale data in the page cache. Fix the problem by locking out faults (as well as reads) using mapping->invalidate_lock while hole punch is running. CC: Steve French CC: linux-cifs@vger.kernel.org Signed-off-by: Jan Kara --- fs/cifs/smb2ops.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c index e4c8f603dd58..458c546ce8cd 100644 --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -3588,6 +3588,7 @@ static long smb3_punch_hole(struct file *file, struct cifs_tcon *tcon, return rc; } + filemap_invalidate_lock(inode->i_mapping); /* * We implement the punch hole through ioctl, so we need remove the page * caches first, otherwise the data may be inconsistent with the server. @@ -3605,6 +3606,7 @@ static long smb3_punch_hole(struct file *file, struct cifs_tcon *tcon, sizeof(struct file_zero_data_information), CIFSMaxBufSize, NULL, NULL); free_xid(xid); + filemap_invalidate_unlock(inode->i_mapping); return rc; }