From mboxrd@z Thu Jan 1 00:00:00 1970 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=-7.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 C3323C43381 for ; Wed, 20 Mar 2019 17:47:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9C0CE2184D for ; Wed, 20 Mar 2019 17:47:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553104068; bh=DOPW+NdgojR0vLtzhX3xy8/Vj2REv7VUCYLyhmumWtY=; h=Subject:To:Cc:From:Date:List-ID:From; b=vy52h8YkWskow2BMhdw8Z9dvcXR58BwdbMuy9A+Q0rBOhWT4jcRd5WVNyulP5PtJc 1bBRy9Lf8YQ+URkGFhfHz3+hCqusN8/ASVc6WWxoYjry9urYXhJlioHOYqCJ9FnnXS NSqCqeeIngprXyBglZXkmph8GMztYxPuKWLxGX5U= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727244AbfCTRrs (ORCPT ); Wed, 20 Mar 2019 13:47:48 -0400 Received: from out5-smtp.messagingengine.com ([66.111.4.29]:40625 "EHLO out5-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726438AbfCTRrs (ORCPT ); Wed, 20 Mar 2019 13:47:48 -0400 Received: from compute6.internal (compute6.nyi.internal [10.202.2.46]) by mailout.nyi.internal (Postfix) with ESMTP id 13EF523154; Wed, 20 Mar 2019 13:47:47 -0400 (EDT) Received: from mailfrontend2 ([10.202.2.163]) by compute6.internal (MEProxy); Wed, 20 Mar 2019 13:47:47 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:content-transfer-encoding:content-type :date:from:message-id:mime-version:subject:to:x-me-proxy :x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s=fm2; bh=JXDojV Unlwcdm6ocIx4dlTSTiVfOnRdFj8uDJb7f3as=; b=UA1Pdw9LFyRTyvcPVOFSE0 zsNDua6mpMJx50wMIusUMKn+U2dLYHmKLP7ozmFcqQsNhXIjaXvfhXOcOLYZ3AW/ NZNFGN2Y25C5tgGh8DB0x5mL2T6mzVZ+A3mJEXHSYJ+G23wl7mx74DpxRfMY4auI eCGGFz35iatJM52CtC0DcD+Yu/lPMLGyeOpJfxCN98KS6n+ETf5rf2QiGC8eZxlB w3lC4kBMOXHoLOHPzTlPl30/IZ9RlFL6N2KJiFi0/bRHMPdf/QWTKSfEuoGNqgau zzov08Ri7RwMu+4DZBrKR/Vip10SstT8EXgFMVQ8BXG+0MU51EiW8MefiwsUlREg == X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedutddrieeigddutdehucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen uceurghilhhouhhtmecufedttdenucenucfjughrpefuvffhfffkgggtgfesthekredttd dtlfenucfhrhhomhepoehgrhgvghhkhheslhhinhhugihfohhunhgurghtihhonhdrohhr gheqnecukfhppeekfedrkeeirdekledruddtjeenucfrrghrrghmpehmrghilhhfrhhomh epghhrvghgsehkrhhorghhrdgtohhmnecuvehluhhsthgvrhfuihiivgeptd X-ME-Proxy: Received: from localhost (5356596b.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) by mail.messagingengine.com (Postfix) with ESMTPA id 5CF3110310; Wed, 20 Mar 2019 13:47:46 -0400 (EDT) Subject: FAILED: patch "[PATCH] Btrfs: fix deadlock between clone/dedupe and rename" failed to apply to 4.9-stable tree To: fdmanana@suse.com, ce3g8jdj@umail.furryterror.org, dsterba@suse.com Cc: From: Date: Wed, 20 Mar 2019 18:47:41 +0100 Message-ID: <15531040611280@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org The patch below does not apply to the 4.9-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 4ea748e1d2c9f8a27332b949e8210dbbf392987e Mon Sep 17 00:00:00 2001 From: Filipe Manana Date: Tue, 26 Feb 2019 12:06:09 +0000 Subject: [PATCH] Btrfs: fix deadlock between clone/dedupe and rename Reflinking (clone/dedupe) and rename are operations that operate on two inodes and therefore need to lock them in the same order to avoid ABBA deadlocks. It happens that Btrfs' reflink implementation always locked them in a different order from VFS's lock_two_nondirectories() helper, which is used by the rename code in VFS, resulting in ABBA type deadlocks. Btrfs' locking order: static void btrfs_double_inode_lock(struct inode *inode1, struct inode *inode2) { if (inode1 < inode2) swap(inode1, inode2); inode_lock_nested(inode1, I_MUTEX_PARENT); inode_lock_nested(inode2, I_MUTEX_CHILD); } VFS's locking order: void lock_two_nondirectories(struct inode *inode1, struct inode *inode2) { if (inode1 > inode2) swap(inode1, inode2); if (inode1 && !S_ISDIR(inode1->i_mode)) inode_lock(inode1); if (inode2 && !S_ISDIR(inode2->i_mode) && inode2 != inode1) inode_lock_nested(inode2, I_MUTEX_NONDIR2); } Fix this by killing the btrfs helper function that does the double inode locking and replace it with VFS's helper lock_two_nondirectories(). Reported-by: Zygo Blaxell Fixes: 416161db9b63e3 ("btrfs: offline dedupe") CC: stable@vger.kernel.org # 4.4+ Signed-off-by: Filipe Manana Signed-off-by: David Sterba diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 494f0f10d70e..ec2d8919e7fb 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -3207,21 +3207,6 @@ static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, return ret; } -static void btrfs_double_inode_unlock(struct inode *inode1, struct inode *inode2) -{ - inode_unlock(inode1); - inode_unlock(inode2); -} - -static void btrfs_double_inode_lock(struct inode *inode1, struct inode *inode2) -{ - if (inode1 < inode2) - swap(inode1, inode2); - - inode_lock_nested(inode1, I_MUTEX_PARENT); - inode_lock_nested(inode2, I_MUTEX_CHILD); -} - static void btrfs_double_extent_unlock(struct inode *inode1, u64 loff1, struct inode *inode2, u64 loff2, u64 len) { @@ -3956,7 +3941,7 @@ static int btrfs_remap_file_range_prep(struct file *file_in, loff_t pos_in, if (same_inode) inode_lock(inode_in); else - btrfs_double_inode_lock(inode_in, inode_out); + lock_two_nondirectories(inode_in, inode_out); /* don't make the dst file partly checksummed */ if ((BTRFS_I(inode_in)->flags & BTRFS_INODE_NODATASUM) != @@ -4013,7 +3998,7 @@ static int btrfs_remap_file_range_prep(struct file *file_in, loff_t pos_in, if (same_inode) inode_unlock(inode_in); else - btrfs_double_inode_unlock(inode_in, inode_out); + unlock_two_nondirectories(inode_in, inode_out); return ret; } @@ -4043,7 +4028,7 @@ loff_t btrfs_remap_file_range(struct file *src_file, loff_t off, if (same_inode) inode_unlock(src_inode); else - btrfs_double_inode_unlock(src_inode, dst_inode); + unlock_two_nondirectories(src_inode, dst_inode); return ret < 0 ? ret : len; }