From patchwork Mon Jun 7 14:52:23 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jan Kara X-Patchwork-Id: 12303767 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 18E3AC4CC6E for ; Mon, 7 Jun 2021 14:52:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E232061107 for ; Mon, 7 Jun 2021 14:52:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231448AbhFGOyp (ORCPT ); Mon, 7 Jun 2021 10:54:45 -0400 Received: from smtp-out2.suse.de ([195.135.220.29]:51740 "EHLO smtp-out2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231157AbhFGOyd (ORCPT ); Mon, 7 Jun 2021 10:54:33 -0400 Received: from relay2.suse.de (relay2.suse.de [149.44.160.134]) by smtp-out2.suse.de (Postfix) with ESMTP id 0DA7F1FDD6; Mon, 7 Jun 2021 14:52:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1623077558; 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=c5hN9VihgYabPzS6M/DoMuNHHykbae3N2/E4zCgl0t4=; b=NFenYZndzTQCSEs0kiVAUsrK4q4SXXp9cvTfVysJCl9S8OYKpb3mep2Wudp9TVce+rKAos ADmLsAgkFnGXxOPA69oYb85BUicyV5sjjgoWrMhz6Wpq7+ACrl16M4hl2VwI4wW/Ld4Gho I9oJu7DPonRpgXb0g9RDbabMD167D1E= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1623077558; 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=c5hN9VihgYabPzS6M/DoMuNHHykbae3N2/E4zCgl0t4=; b=YpALarJquUvnyzCPi/IGQR1z3cZ2is7/Uh27Kg/PZfUSGOrH9/QH4sHHGmPwz8dPsIyLwH UR1UQkMjNEdHi2Bw== Received: from quack2.suse.cz (unknown [10.100.200.198]) by relay2.suse.de (Postfix) with ESMTP id DA68DA3B92; Mon, 7 Jun 2021 14:52:37 +0000 (UTC) Received: by quack2.suse.cz (Postfix, from userid 1000) id C03301F2CBF; Mon, 7 Jun 2021 16:52:36 +0200 (CEST) From: Jan Kara To: Cc: Christoph Hellwig , Dave Chinner , ceph-devel@vger.kernel.org, Chao Yu , Damien Le Moal , "Darrick J. Wong" , Jaegeuk Kim , Jeff Layton , Johannes Thumshirn , linux-cifs@vger.kernel.org, , linux-f2fs-devel@lists.sourceforge.net, , , Miklos Szeredi , Steve French , Ted Tso , Matthew Wilcox , Jan Kara Subject: [PATCH 13/14] ceph: Fix race between hole punch and page fault Date: Mon, 7 Jun 2021 16:52:23 +0200 Message-Id: <20210607145236.31852-13-jack@suse.cz> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210607144631.8717-1-jack@suse.cz> References: <20210607144631.8717-1-jack@suse.cz> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2465; h=from:subject; bh=Sp8IgV3mV8zmiY5I9Wbg4z0IgLX0J9niLgWRID5omWo=; b=owEBbQGS/pANAwAIAZydqgc/ZEDZAcsmYgBgvjKmt/G434Rs9ZHmHm4m7KwtsKNjseeQr2d06yTU b1jblrKJATMEAAEIAB0WIQSrWdEr1p4yirVVKBycnaoHP2RA2QUCYL4ypgAKCRCcnaoHP2RA2XPBB/ 0WRyE3RzVXQo4gUS7mKGJPyff+S+h8thH32QhOWZDXf4WYznPoJ+G3wFt5xde4p7HM3U7v4hpB7tQ8 EygfikeupmDm5O4NkUcQX/1NsWO5mf1y1khgu8KW9yas0wO4nNDvfUKTZj+5HUQukNJRO9ns9dIP+i ZHpf05z3tet5psuGs9y6FwuZstNgxlaQ9J8UOjG7fthTYQQ84eb7tMDli7aa2ogiQCpEULtSaR2KZq oSaXwXuly1pLWQKgrrob8K3/TVpt+5qVCPl0s81BB5Lp+mP2VILVhXd3lUp0wCBKewMTkqSdkyuX4i GM5IPBYS2vNK7LNSJvGIyk6io3Qiy/ X-Developer-Key: i=jack@suse.cz; a=openpgp; fpr=93C6099A142276A28BBE35D815BC833443038D8C Precedence: bulk List-ID: X-Mailing-List: ceph-devel@vger.kernel.org Ceph has a following race between hole punching and page fault: CPU1 CPU2 ceph_fallocate() ... ceph_zero_pagecache_range() ceph_filemap_fault() faults in page in the range being punched ceph_zero_objects() And now we have a page in punched range with invalid data. Fix the problem by using mapping->invalidate_lock similarly to other filesystems. Note that using invalidate_lock also fixes a similar race wrt ->readpage(). CC: Jeff Layton CC: ceph-devel@vger.kernel.org Reviewed-by: Jeff Layton Signed-off-by: Jan Kara --- fs/ceph/addr.c | 9 ++++++--- fs/ceph/file.c | 2 ++ 2 files changed, 8 insertions(+), 3 deletions(-) diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c index c1570fada3d8..4664b93a32db 100644 --- a/fs/ceph/addr.c +++ b/fs/ceph/addr.c @@ -1401,9 +1401,11 @@ static vm_fault_t ceph_filemap_fault(struct vm_fault *vmf) ret = VM_FAULT_SIGBUS; } else { struct address_space *mapping = inode->i_mapping; - struct page *page = find_or_create_page(mapping, 0, - mapping_gfp_constraint(mapping, - ~__GFP_FS)); + struct page *page; + + filemap_invalidate_lock_shared(mapping); + page = find_or_create_page(mapping, 0, + mapping_gfp_constraint(mapping, ~__GFP_FS)); if (!page) { ret = VM_FAULT_OOM; goto out_inline; @@ -1424,6 +1426,7 @@ static vm_fault_t ceph_filemap_fault(struct vm_fault *vmf) vmf->page = page; ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED; out_inline: + filemap_invalidate_unlock_shared(mapping); dout("filemap_fault %p %llu read inline data ret %x\n", inode, off, ret); } diff --git a/fs/ceph/file.c b/fs/ceph/file.c index 77fc037d5beb..e826b1b1e4af 100644 --- a/fs/ceph/file.c +++ b/fs/ceph/file.c @@ -2083,6 +2083,7 @@ static long ceph_fallocate(struct file *file, int mode, if (ret < 0) goto unlock; + filemap_invalidate_lock(inode->i_mapping); ceph_zero_pagecache_range(inode, offset, length); ret = ceph_zero_objects(inode, offset, length); @@ -2095,6 +2096,7 @@ static long ceph_fallocate(struct file *file, int mode, if (dirty) __mark_inode_dirty(inode, dirty); } + filemap_invalidate_unlock(inode->i_mapping); ceph_put_cap_refs(ci, got); unlock: