From patchwork Thu Jun 1 10:58:21 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jan Kara X-Patchwork-Id: 13263491 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 607AEC7EE2F for ; Thu, 1 Jun 2023 10:58:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229589AbjFAK6h (ORCPT ); Thu, 1 Jun 2023 06:58:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52964 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232439AbjFAK6d (ORCPT ); Thu, 1 Jun 2023 06:58:33 -0400 Received: from smtp-out2.suse.de (smtp-out2.suse.de [IPv6:2001:67c:2178:6::1d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F3D1F119; Thu, 1 Jun 2023 03:58:31 -0700 (PDT) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id ABCB91FDA4; Thu, 1 Jun 2023 10:58:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1685617110; 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=AOBPab5sBc+U602a0bs2SOLbJwxohD0hSk5muDSlfQg=; b=m0aixr+dCqe3K9QfB6/idjG/MQKrA1uRsE+ODOhIApPE30Yn+1bCdVPlWc3cAE0BYLcbNt KYF9tnNVKUVnVbCxM28ExF1cZ7pc76e6siluMzm3z/44yM1iP9hFSCstJcYMPzkGq9HQ3k G4nRfODLjVS1sXAPocRGR/wz1CnnahY= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1685617110; 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=AOBPab5sBc+U602a0bs2SOLbJwxohD0hSk5muDSlfQg=; b=ZjXPEfA/Z6p0tD0pWba6YYhkH+ZxhOKi8Tv7saBw2dmqzSbTDfaZE5tO7b8+il6b40v5bY tmKqIcU1kwtFu2Bw== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 9757313A34; Thu, 1 Jun 2023 10:58:30 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id WjdTJNZ5eGRvWAAAMHmgww (envelope-from ); Thu, 01 Jun 2023 10:58:30 +0000 Received: by quack3.suse.cz (Postfix, from userid 1000) id 127C7A06F2; Thu, 1 Jun 2023 12:58:30 +0200 (CEST) From: Jan Kara To: Al Viro Cc: , Christian Brauner , Miklos Szeredi , "Darrick J. Wong" , Ted Tso , Jaegeuk Kim , , , linux-f2fs-devel@lists.sourceforge.net, Jan Kara , stable@vger.kernel.org Subject: [PATCH v2 1/6] ext4: Remove ext4 locking of moved directory Date: Thu, 1 Jun 2023 12:58:21 +0200 Message-Id: <20230601105830.13168-1-jack@suse.cz> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20230601104525.27897-1-jack@suse.cz> References: <20230601104525.27897-1-jack@suse.cz> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1467; i=jack@suse.cz; h=from:subject; bh=XV5CJdcSgiBkW1x4p8thTfL0TVuanLRiOHdfMG5wLnM=; b=owGbwMvMwME4Z+4qdvsUh5uMp9WSGFIqKs8qZLmlpvw48TWHpdA694OFxWeVaLv2zZwfJjl4Hzj9 Ne5aJ6MxCwMjB4OsmCLL6siL2tfmGXVtDdWQgRnEygQyhYGLUwAmwsDH/k/X8e7htO0Jitt7fN9Nbv TO+Z9oc7PXwOSov8BXnTima2z8heFKVlyyGr3ZDFzWDhYWWVsvW5/osepYKtf7f+qeL+2iXDW6PHl/ BJe4FApfulAz+VFo/28bwyiOltbZUsu/F73dsUDVlfceS/PXqbXTc/7Jz4j7IN4W9lF5s77Mmc0CRn eD699+b5rwIO7By67vRpuFF9/WCLr1MrnaXW+Vo8zUHfxum5/MmiJjFLLxRNTFjU92sy9d5VlS1rmI V1E38gt76rL95UtsE6ZMcsjxWrd/cbFb9KQDS5eVn0iZuXQTb7Wg1KMA1dd7+g47T4h11IluPa6Q1l ARMPl6hU2PbNGaPHe5kr7CeFshAA== X-Developer-Key: i=jack@suse.cz; a=openpgp; fpr=93C6099A142276A28BBE35D815BC833443038D8C Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Remove locking of moved directory in ext4_rename2(). We will take care of it in VFS instead. This effectively reverts commit 0813299c586b ("ext4: Fix possible corruption when moving a directory") and followup fixes. CC: Ted Tso CC: stable@vger.kernel.org Signed-off-by: Jan Kara --- fs/ext4/namei.c | 17 ++--------------- 1 file changed, 2 insertions(+), 15 deletions(-) diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c index 45b579805c95..0caf6c730ce3 100644 --- a/fs/ext4/namei.c +++ b/fs/ext4/namei.c @@ -3834,19 +3834,10 @@ static int ext4_rename(struct mnt_idmap *idmap, struct inode *old_dir, return retval; } - /* - * We need to protect against old.inode directory getting converted - * from inline directory format into a normal one. - */ - if (S_ISDIR(old.inode->i_mode)) - inode_lock_nested(old.inode, I_MUTEX_NONDIR2); - old.bh = ext4_find_entry(old.dir, &old.dentry->d_name, &old.de, &old.inlined); - if (IS_ERR(old.bh)) { - retval = PTR_ERR(old.bh); - goto unlock_moved_dir; - } + if (IS_ERR(old.bh)) + return PTR_ERR(old.bh); /* * Check for inode number is _not_ due to possible IO errors. @@ -4043,10 +4034,6 @@ static int ext4_rename(struct mnt_idmap *idmap, struct inode *old_dir, brelse(old.bh); brelse(new.bh); -unlock_moved_dir: - if (S_ISDIR(old.inode->i_mode)) - inode_unlock(old.inode); - return retval; } From patchwork Thu Jun 1 10:58:22 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jan Kara X-Patchwork-Id: 13263492 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 A834BC7EE32 for ; Thu, 1 Jun 2023 10:58:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233201AbjFAK6g (ORCPT ); Thu, 1 Jun 2023 06:58:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52950 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231605AbjFAK6c (ORCPT ); Thu, 1 Jun 2023 06:58:32 -0400 Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.220.29]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E1D7E107; Thu, 1 Jun 2023 03:58:31 -0700 (PDT) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 9CA741FDA3; Thu, 1 Jun 2023 10:58:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1685617110; 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=ioHF3wJZOEdK9Zi2g8x0HxHqMAZdyIP3moICR5/W8ZM=; b=AMqfoQG+Oqjn4ZqNhHx+B0BDjqiyhV8yIbX3yzJbvq3FNyYQfdfufCQFRg0anXY2Czp8Ld LJNCdivx4JGpOmLRTntSNnx7L/a2XoSCRJekq15ccyjFrvAaNCf0tp05GBPty7EcyJ4HvC 2UWijpfiNW2KRbcLlH62o62KCQXB2ZE= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1685617110; 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=ioHF3wJZOEdK9Zi2g8x0HxHqMAZdyIP3moICR5/W8ZM=; b=g6E4r15cOMFlrWtQmecf7LGmqF15nLLRfnb0JE+2kjFsYt+vJumZnB9H3ENlitVeHBAXQT BuySk7STrx6wPXDw== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 8E09F13441; Thu, 1 Jun 2023 10:58:30 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id uUi2ItZ5eGRuWAAAMHmgww (envelope-from ); Thu, 01 Jun 2023 10:58:30 +0000 Received: by quack3.suse.cz (Postfix, from userid 1000) id 17082A075C; Thu, 1 Jun 2023 12:58:30 +0200 (CEST) From: Jan Kara To: Al Viro Cc: , Christian Brauner , Miklos Szeredi , "Darrick J. Wong" , Ted Tso , Jaegeuk Kim , , , linux-f2fs-devel@lists.sourceforge.net, Jan Kara , stable@vger.kernel.org Subject: [PATCH v2 2/6] Revert "udf: Protect rename against modification of moved directory" Date: Thu, 1 Jun 2023 12:58:22 +0200 Message-Id: <20230601105830.13168-2-jack@suse.cz> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20230601104525.27897-1-jack@suse.cz> References: <20230601104525.27897-1-jack@suse.cz> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1840; i=jack@suse.cz; h=from:subject; bh=cUFu/3mUBi4bt/K+j6IZ3Ng8iPItrjlJa92MM2nlCwY=; b=owEBbQGS/pANAwAIAZydqgc/ZEDZAcsmYgBkeHnOIPd8xE0p+HpULv7ZaonyuahLzBKAgbz88fay PJv6AsKJATMEAAEIAB0WIQSrWdEr1p4yirVVKBycnaoHP2RA2QUCZHh5zgAKCRCcnaoHP2RA2QysCA CTIL3by4FVm7WFw+onDgoqu8NeITyZA2OomlK2x/zMpGpAxU2bz3Ofz3PeZubavF2I9MoQWxdk+pWa RYbSbJui5ntaXx5C0j16m552h7dRKKOxBW7gb9xde7hP5jMPO7WYgLo+5d8ZcBUWHBlCfWmIa33Ux+ fCNk4AbSKt01GVTTdUV47s++JoTwJC1SFAM7YYNlIMbS/zMO1Q6QCH8neqeNaL2wTcPZD9CvXB4vYI q42iN5IBmGVsEoKZURp+YLUyXMETAn6Jn/yAptPq+hiSjg79nvYaEzukgMynxraFCSD4q1r28ZjcMW jzWw6gfSHe3ui3HXZ0VDAoaQ1F7rjY X-Developer-Key: i=jack@suse.cz; a=openpgp; fpr=93C6099A142276A28BBE35D815BC833443038D8C Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org This reverts commit f950fd0529130a617b3da526da9fb6a896ce87c2. The locking is going to be provided by vfs_rename() in the following patches. CC: stable@vger.kernel.org Signed-off-by: Jan Kara --- fs/udf/namei.c | 14 ++------------ 1 file changed, 2 insertions(+), 12 deletions(-) diff --git a/fs/udf/namei.c b/fs/udf/namei.c index fd20423d3ed2..fd29a66e7241 100644 --- a/fs/udf/namei.c +++ b/fs/udf/namei.c @@ -793,11 +793,6 @@ static int udf_rename(struct mnt_idmap *idmap, struct inode *old_dir, if (!empty_dir(new_inode)) goto out_oiter; } - /* - * We need to protect against old_inode getting converted from - * ICB to normal directory. - */ - inode_lock_nested(old_inode, I_MUTEX_NONDIR2); retval = udf_fiiter_find_entry(old_inode, &dotdot_name, &diriter); if (retval == -ENOENT) { @@ -806,10 +801,8 @@ static int udf_rename(struct mnt_idmap *idmap, struct inode *old_dir, old_inode->i_ino); retval = -EFSCORRUPTED; } - if (retval) { - inode_unlock(old_inode); + if (retval) goto out_oiter; - } has_diriter = true; tloc = lelb_to_cpu(diriter.fi.icb.extLocation); if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) != @@ -889,7 +882,6 @@ static int udf_rename(struct mnt_idmap *idmap, struct inode *old_dir, udf_dir_entry_len(&diriter.fi)); udf_fiiter_write_fi(&diriter, NULL); udf_fiiter_release(&diriter); - inode_unlock(old_inode); inode_dec_link_count(old_dir); if (new_inode) @@ -901,10 +893,8 @@ static int udf_rename(struct mnt_idmap *idmap, struct inode *old_dir, } return 0; out_oiter: - if (has_diriter) { + if (has_diriter) udf_fiiter_release(&diriter); - inode_unlock(old_inode); - } udf_fiiter_release(&oiter); return retval; From patchwork Thu Jun 1 10:58:23 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jan Kara X-Patchwork-Id: 13263496 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 5FDBAC7EE31 for ; Thu, 1 Jun 2023 10:58:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233224AbjFAK6p (ORCPT ); Thu, 1 Jun 2023 06:58:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52966 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232996AbjFAK6d (ORCPT ); Thu, 1 Jun 2023 06:58:33 -0400 Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.220.28]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2C19A123; Thu, 1 Jun 2023 03:58:32 -0700 (PDT) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id BEF0121977; Thu, 1 Jun 2023 10:58:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1685617110; 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=l8ThI8pc0gEYM+rQf003qTc2rYTYbf8AIQ/C2gqIwQo=; b=EiohVwjHYg+avXFTB0p46tIJfiBDAIKalcBVnJ7R6JTKBIwUnGkED60gUDPBoLVh76tQo4 hoPiQoQ/fS8dtK48aHLRWL1e+lrFAsFsm9S9nsLO9eMz4E6BpH6nF05OFsMDjXP+TuR1MR hnat0IaHtTkoeWnEowuat2rCVrFDTZs= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1685617110; 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=l8ThI8pc0gEYM+rQf003qTc2rYTYbf8AIQ/C2gqIwQo=; b=/C7wvZduKPLMMtbUqsD3Kcm8Vd1e5qZQ6XBbi2KRVmpBs+C15GrF220wTLYX+6vdd5Q/Z2 e4oAKyhNozClbuBg== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id AD74913441; Thu, 1 Jun 2023 10:58:30 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id RoBQKtZ5eGRyWAAAMHmgww (envelope-from ); Thu, 01 Jun 2023 10:58:30 +0000 Received: by quack3.suse.cz (Postfix, from userid 1000) id 1D5A3A075D; Thu, 1 Jun 2023 12:58:30 +0200 (CEST) From: Jan Kara To: Al Viro Cc: , Christian Brauner , Miklos Szeredi , "Darrick J. Wong" , Ted Tso , Jaegeuk Kim , , , linux-f2fs-devel@lists.sourceforge.net, Jan Kara , stable@vger.kernel.org Subject: [PATCH v2 3/6] Revert "f2fs: fix potential corruption when moving a directory" Date: Thu, 1 Jun 2023 12:58:23 +0200 Message-Id: <20230601105830.13168-3-jack@suse.cz> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20230601104525.27897-1-jack@suse.cz> References: <20230601104525.27897-1-jack@suse.cz> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1658; i=jack@suse.cz; h=from:subject; bh=vkItO1SrB+pdJMx2hexFFd1udgUclLpxYk9h2ck+yss=; b=owEBbQGS/pANAwAIAZydqgc/ZEDZAcsmYgBkeHnOpRE2Fjl98U8Lrl0R5i/BOQo9DAUy4HoMvjC0 F+Fj1NGJATMEAAEIAB0WIQSrWdEr1p4yirVVKBycnaoHP2RA2QUCZHh5zgAKCRCcnaoHP2RA2ag2B/ 9/ecubF4aHWpimomirmPI1uO5BYJ4rTDO4cIHeeJvzuI0XkpnxbsKeQoDvrbDpx+4ceSwQ6OzlXbKa srEmL1KOmEEDAodTu3j420L30CjK9kZ00DvmcSIYqxIqKvgvzj09UZ3a0F8G3HaCVjxuyFGpfi/0JU E5Umxq6pl+APJZrwjLWWVTegIS3Kcgv09Pju8qs19P7sG5PtzVsNQ85onQITfYsBRE00ScVbaoNV8W 4SA1O+MZczgnZbeeeaizvd+snn3wJc6Bn4pyRtInlBuc1B/xc3C4SxRNsnz2O+It87CImxxK4NSt/r zg5Rm5D/z3jPaSw2MWdPsXZ7oiUD+h X-Developer-Key: i=jack@suse.cz; a=openpgp; fpr=93C6099A142276A28BBE35D815BC833443038D8C Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org This reverts commit d94772154e524b329a168678836745d2773a6e02. The locking is going to be provided by VFS. CC: Jaegeuk Kim CC: stable@vger.kernel.org Signed-off-by: Jan Kara --- fs/f2fs/namei.c | 16 +--------------- 1 file changed, 1 insertion(+), 15 deletions(-) diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c index 77a71276ecb1..ad597b417fea 100644 --- a/fs/f2fs/namei.c +++ b/fs/f2fs/namei.c @@ -995,20 +995,12 @@ static int f2fs_rename(struct mnt_idmap *idmap, struct inode *old_dir, goto out; } - /* - * Copied from ext4_rename: we need to protect against old.inode - * directory getting converted from inline directory format into - * a normal one. - */ - if (S_ISDIR(old_inode->i_mode)) - inode_lock_nested(old_inode, I_MUTEX_NONDIR2); - err = -ENOENT; old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page); if (!old_entry) { if (IS_ERR(old_page)) err = PTR_ERR(old_page); - goto out_unlock_old; + goto out; } if (S_ISDIR(old_inode->i_mode)) { @@ -1116,9 +1108,6 @@ static int f2fs_rename(struct mnt_idmap *idmap, struct inode *old_dir, f2fs_unlock_op(sbi); - if (S_ISDIR(old_inode->i_mode)) - inode_unlock(old_inode); - if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir)) f2fs_sync_fs(sbi->sb, 1); @@ -1133,9 +1122,6 @@ static int f2fs_rename(struct mnt_idmap *idmap, struct inode *old_dir, f2fs_put_page(old_dir_page, 0); out_old: f2fs_put_page(old_page, 0); -out_unlock_old: - if (S_ISDIR(old_inode->i_mode)) - inode_unlock(old_inode); out: iput(whiteout); return err; From patchwork Thu Jun 1 10:58:24 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jan Kara X-Patchwork-Id: 13263493 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 93657C7EE2A for ; Thu, 1 Jun 2023 10:58:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233239AbjFAK6j (ORCPT ); Thu, 1 Jun 2023 06:58:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52978 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233075AbjFAK6f (ORCPT ); Thu, 1 Jun 2023 06:58:35 -0400 Received: from smtp-out2.suse.de (smtp-out2.suse.de [IPv6:2001:67c:2178:6::1d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4F459128; Thu, 1 Jun 2023 03:58:32 -0700 (PDT) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id BED651FDA8; Thu, 1 Jun 2023 10:58:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1685617110; 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=9GkePM4DubixxF/Togl9EDjSplXJHzVlt1TjjubXI6U=; b=slatgofTC1FAmauPjXvaRavFj1ucK0rmX6U3pkMK7g8nnmx0Jo/kPtINHqLNXw7GUbwb1w /ztD5ytaQnOXlejb0d4lmm7cfRqFIKFN7+b1BzZ+hSlyw6VPDv8T6ZTn0jHFKTjUi32r0b HyxQ2KcxqucQD2QVIBQ6/adQk9TM9Wc= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1685617110; 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=9GkePM4DubixxF/Togl9EDjSplXJHzVlt1TjjubXI6U=; b=+PZusY3/jcoS/JUtfNuVliL6Ytt+jkK3M6rPOZB1ovGNIOIvQy1cZP0jFs/SQOjbk2U4cW fRa4ig8VkCobYsBw== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id B060513A34; Thu, 1 Jun 2023 10:58:30 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id kqQMK9Z5eGRzWAAAMHmgww (envelope-from ); Thu, 01 Jun 2023 10:58:30 +0000 Received: by quack3.suse.cz (Postfix, from userid 1000) id 23FB1A0762; Thu, 1 Jun 2023 12:58:30 +0200 (CEST) From: Jan Kara To: Al Viro Cc: , Christian Brauner , Miklos Szeredi , "Darrick J. Wong" , Ted Tso , Jaegeuk Kim , , , linux-f2fs-devel@lists.sourceforge.net, Jan Kara , stable@vger.kernel.org Subject: [PATCH v2 4/6] fs: Establish locking order for unrelated directories Date: Thu, 1 Jun 2023 12:58:24 +0200 Message-Id: <20230601105830.13168-4-jack@suse.cz> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20230601104525.27897-1-jack@suse.cz> References: <20230601104525.27897-1-jack@suse.cz> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=3496; i=jack@suse.cz; h=from:subject; bh=5xE40J+PulDN9eVzw5lw6aBn+txq+yIpzvhj12wC0EY=; b=owEBbQGS/pANAwAIAZydqgc/ZEDZAcsmYgBkeHnPY8LB6Lx7l0td+dFkItKAtx61uKArJSscpjR8 raeoUD2JATMEAAEIAB0WIQSrWdEr1p4yirVVKBycnaoHP2RA2QUCZHh5zwAKCRCcnaoHP2RA2cjOB/ 9DhZsLwCaOA84pjyOo2bXNwruEQ6X3HjIwB8zJp9WHd8TLG9ud81Oc6FDDNJmY35Ub7hou0NB8b9XN /1hOOJvVjjumxLrI62LrSHiDVlHogm1aiZ0qEjxLGfQkNA/sl4m21EKgnm6IXMsRjFUo3Vo/zq6Qar jFG5pq7ToYOY79cf3zAMe5D3eiEXxC/OlE0ykzstffroAMZwmxvhuKnw1Mn1g1VUfJ4EV7PvLyiA5Z 2eHvwxOzoVxM6fgw9IRhS5REEZdXLLJcSf2vYbBqinmAHS019XRmm9DoY4cNFd/pDOs2GeKKHCrARV ylAmHIYNsLlC/8HMRTjuuMkI8unfU5 X-Developer-Key: i=jack@suse.cz; a=openpgp; fpr=93C6099A142276A28BBE35D815BC833443038D8C Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Currently the locking order of inode locks for directories that are not in ancestor relationship is not defined because all operations that needed to lock two directories like this were serialized by sb->s_vfs_rename_mutex. However some filesystems need to lock two subdirectories for RENAME_EXCHANGE operations and for this we need the locking order established even for two tree-unrelated directories. Provide a helper function lock_two_inodes() that establishes lock ordering for any two inodes and use it in lock_two_directories(). CC: stable@vger.kernel.org Signed-off-by: Jan Kara --- fs/inode.c | 42 ++++++++++++++++++++++++++++++++++++++++++ fs/internal.h | 2 ++ fs/namei.c | 4 ++-- 3 files changed, 46 insertions(+), 2 deletions(-) diff --git a/fs/inode.c b/fs/inode.c index 577799b7855f..4000ab08bbc0 100644 --- a/fs/inode.c +++ b/fs/inode.c @@ -1103,6 +1103,48 @@ void discard_new_inode(struct inode *inode) } EXPORT_SYMBOL(discard_new_inode); +/** + * lock_two_inodes - lock two inodes (may be regular files but also dirs) + * + * Lock any non-NULL argument. The caller must make sure that if he is passing + * in two directories, one is not ancestor of the other. Zero, one or two + * objects may be locked by this function. + * + * @inode1: first inode to lock + * @inode2: second inode to lock + * @subclass1: inode lock subclass for the first lock obtained + * @subclass2: inode lock subclass for the second lock obtained + */ +void lock_two_inodes(struct inode *inode1, struct inode *inode2, + unsigned subclass1, unsigned subclass2) +{ + if (!inode1 || !inode2) + /* + * Make sure @subclass1 will be used for the acquired lock. + * This is not strictly necessary (no current caller cares) but + * let's keep things consistent. + */ + if (!inode1) + swap(inode1, inode2); + goto lock; + } + + /* + * If one object is directory and the other is not, we must make sure + * to lock directory first as the other object may be its child. + */ + if (S_ISDIR(inode2->i_mode) == S_ISDIR(inode1->i_mode)) { + if (inode1 > inode2) + swap(inode1, inode2); + } else if (!S_ISDIR(inode1->i_mode)) + swap(inode1, inode2); +lock: + if (inode1) + inode_lock_nested(inode1, subclass1); + if (inode2 && inode2 != inode1) + inode_lock_nested(inode2, subclass2); +} + /** * lock_two_nondirectories - take two i_mutexes on non-directory objects * diff --git a/fs/internal.h b/fs/internal.h index bd3b2810a36b..377030a50aca 100644 --- a/fs/internal.h +++ b/fs/internal.h @@ -152,6 +152,8 @@ extern long prune_icache_sb(struct super_block *sb, struct shrink_control *sc); int dentry_needs_remove_privs(struct mnt_idmap *, struct dentry *dentry); bool in_group_or_capable(struct mnt_idmap *idmap, const struct inode *inode, vfsgid_t vfsgid); +void lock_two_inodes(struct inode *inode1, struct inode *inode2, + unsigned subclass1, unsigned subclass2); /* * fs-writeback.c diff --git a/fs/namei.c b/fs/namei.c index e4fe0879ae55..148570aabe74 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -3028,8 +3028,8 @@ static struct dentry *lock_two_directories(struct dentry *p1, struct dentry *p2) return p; } - inode_lock_nested(p1->d_inode, I_MUTEX_PARENT); - inode_lock_nested(p2->d_inode, I_MUTEX_PARENT2); + lock_two_inodes(p1->d_inode, p2->d_inode, + I_MUTEX_PARENT, I_MUTEX_PARENT2); return NULL; } From patchwork Thu Jun 1 10:58:25 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jan Kara X-Patchwork-Id: 13263497 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 3C804C7EE32 for ; Thu, 1 Jun 2023 10:58:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232996AbjFAK6q (ORCPT ); Thu, 1 Jun 2023 06:58:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52988 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233128AbjFAK6f (ORCPT ); Thu, 1 Jun 2023 06:58:35 -0400 Received: from smtp-out1.suse.de (smtp-out1.suse.de [IPv6:2001:67c:2178:6::1c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 73FE2129; 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bh=WVCS2NXBW5ZH4HJiDG94f7/my/nZc/t1gaXommKhNSs=; b=s2Ncj+jC+LWCSSYtcD2/hbX1MZeKwUEnf5kIdxKy9neWgXvER8vXh4BvHoC7nLPnGfbPsT G09K2PkXlnZg9vDg== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 0A35613441; Thu, 1 Jun 2023 10:58:31 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id BpuIAtd5eGSAWAAAMHmgww (envelope-from ); Thu, 01 Jun 2023 10:58:31 +0000 Received: by quack3.suse.cz (Postfix, from userid 1000) id 27813A0763; Thu, 1 Jun 2023 12:58:30 +0200 (CEST) From: Jan Kara To: Al Viro Cc: , Christian Brauner , Miklos Szeredi , "Darrick J. Wong" , Ted Tso , Jaegeuk Kim , , , linux-f2fs-devel@lists.sourceforge.net, Jan Kara , stable@vger.kernel.org Subject: [PATCH v2 5/6] fs: Lock moved directories Date: Thu, 1 Jun 2023 12:58:25 +0200 Message-Id: <20230601105830.13168-5-jack@suse.cz> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20230601104525.27897-1-jack@suse.cz> References: <20230601104525.27897-1-jack@suse.cz> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=5467; i=jack@suse.cz; h=from:subject; bh=x4FZJj19EKHfl9vXc7blu9EGaRK3J4g/IYXgMMiRgsg=; b=owEBbQGS/pANAwAIAZydqgc/ZEDZAcsmYgBkeHnQOagY8JFtxmxrH4yOG15iOHj85ARzmW1mO6z6 m4CoTtqJATMEAAEIAB0WIQSrWdEr1p4yirVVKBycnaoHP2RA2QUCZHh50AAKCRCcnaoHP2RA2fOmCA CGZ/60qBrc6mq5kJuPlRk9zqrA938OweaDejgjB5rj/+wPTCG423XQxEjq785RwCe9imbIcJywyI89 A0pan5qcfnH3LTQfSvu8g6Jnn/hUJIc/ZMpljEw2EQVWXfo3gjmfNtu2Nv80yeCWEt+RhRaifk2PpA FLUIaavbPKYMxQ68HJ0IAdihcEEjPMCnTBQNJYwjkR9+2RDhPtxB05Dxbx7SoLrQG4CyCnR0UNvBFu VouTBcwwyqv4irtxgwlnroN7k242fLUWgmWkRIlxkPK3MjdN2wTxLC4YYJ1BQ6HnnVZewXTrQEWlUP Sx2kjy7KuoAPi36BlrAAF2PUdusf8G X-Developer-Key: i=jack@suse.cz; a=openpgp; fpr=93C6099A142276A28BBE35D815BC833443038D8C Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org When a directory is moved to a different directory, some filesystems (udf, ext4, ocfs2, f2fs, and likely gfs2, reiserfs, and others) need to update their pointer to the parent and this must not race with other operations on the directory. Lock the directories when they are moved. Although not all filesystems need this locking, we perform it in vfs_rename() because getting the lock ordering right is really difficult and we don't want to expose these locking details to filesystems. CC: stable@vger.kernel.org Signed-off-by: Jan Kara --- .../filesystems/directory-locking.rst | 26 ++++++++++--------- fs/namei.c | 22 ++++++++++------ 2 files changed, 28 insertions(+), 20 deletions(-) diff --git a/Documentation/filesystems/directory-locking.rst b/Documentation/filesystems/directory-locking.rst index 504ba940c36c..dccd61c7c5c3 100644 --- a/Documentation/filesystems/directory-locking.rst +++ b/Documentation/filesystems/directory-locking.rst @@ -22,12 +22,11 @@ exclusive. 3) object removal. Locking rules: caller locks parent, finds victim, locks victim and calls the method. Locks are exclusive. -4) rename() that is _not_ cross-directory. Locking rules: caller locks -the parent and finds source and target. In case of exchange (with -RENAME_EXCHANGE in flags argument) lock both. In any case, -if the target already exists, lock it. If the source is a non-directory, -lock it. If we need to lock both, lock them in inode pointer order. -Then call the method. All locks are exclusive. +4) rename() that is _not_ cross-directory. Locking rules: caller locks the +parent and finds source and target. We lock both (provided they exist). If we +need to lock two inodes of different type (dir vs non-dir), we lock directory +first. If we need to lock two inodes of the same type, lock them in inode +pointer order. Then call the method. All locks are exclusive. NB: we might get away with locking the source (and target in exchange case) shared. @@ -44,15 +43,17 @@ All locks are exclusive. rules: * lock the filesystem - * lock parents in "ancestors first" order. + * lock parents in "ancestors first" order. If one is not ancestor of + the other, lock them in inode pointer order. * find source and target. * if old parent is equal to or is a descendent of target fail with -ENOTEMPTY * if new parent is equal to or is a descendent of source fail with -ELOOP - * If it's an exchange, lock both the source and the target. - * If the target exists, lock it. If the source is a non-directory, - lock it. If we need to lock both, do so in inode pointer order. + * Lock both the source and the target provided they exist. If we + need to lock two inodes of different type (dir vs non-dir), we lock + the directory first. If we need to lock two inodes of the same type, + lock them in inode pointer order. * call the method. All ->i_rwsem are taken exclusive. Again, we might get away with locking @@ -66,8 +67,9 @@ If no directory is its own ancestor, the scheme above is deadlock-free. Proof: - First of all, at any moment we have a partial ordering of the - objects - A < B iff A is an ancestor of B. + First of all, at any moment we have a linear ordering of the + objects - A < B iff (A is an ancestor of B) or (B is not an ancestor + of A and ptr(A) < ptr(B)). That ordering can change. However, the following is true: diff --git a/fs/namei.c b/fs/namei.c index 148570aabe74..6a5e26a529e1 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -4731,7 +4731,7 @@ SYSCALL_DEFINE2(link, const char __user *, oldname, const char __user *, newname * sb->s_vfs_rename_mutex. We might be more accurate, but that's another * story. * c) we have to lock _four_ objects - parents and victim (if it exists), - * and source (if it is not a directory). + * and source. * And that - after we got ->i_mutex on parents (until then we don't know * whether the target exists). Solution: try to be smart with locking * order for inodes. We rely on the fact that tree topology may change @@ -4815,10 +4815,16 @@ int vfs_rename(struct renamedata *rd) take_dentry_name_snapshot(&old_name, old_dentry); dget(new_dentry); - if (!is_dir || (flags & RENAME_EXCHANGE)) - lock_two_nondirectories(source, target); - else if (target) - inode_lock(target); + /* + * Lock all moved children. Moved directories may need to change parent + * pointer so they need the lock to prevent against concurrent + * directory changes moving parent pointer. For regular files we've + * historically always done this. The lockdep locking subclasses are + * somewhat arbitrary but RENAME_EXCHANGE in particular can swap + * regular files and directories so it's difficult to tell which + * subclasses to use. + */ + lock_two_inodes(source, target, I_MUTEX_NORMAL, I_MUTEX_NONDIR2); error = -EPERM; if (IS_SWAPFILE(source) || (target && IS_SWAPFILE(target))) @@ -4866,9 +4872,9 @@ int vfs_rename(struct renamedata *rd) d_exchange(old_dentry, new_dentry); } out: - if (!is_dir || (flags & RENAME_EXCHANGE)) - unlock_two_nondirectories(source, target); - else if (target) + if (source) + inode_unlock(source); + if (target) inode_unlock(target); dput(new_dentry); if (!error) { From patchwork Thu Jun 1 10:58:26 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jan Kara X-Patchwork-Id: 13263494 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 69A85C7EE3A for ; Thu, 1 Jun 2023 10:58:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232921AbjFAK6l (ORCPT ); Thu, 1 Jun 2023 06:58:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52980 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233126AbjFAK6f (ORCPT ); Thu, 1 Jun 2023 06:58:35 -0400 Received: from smtp-out2.suse.de (smtp-out2.suse.de [IPv6:2001:67c:2178:6::1d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8AF9412C; Thu, 1 Jun 2023 03:58:32 -0700 (PDT) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 1FFBE1FD99; Thu, 1 Jun 2023 10:58:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1685617111; 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=MzXOzo95g617qUk7Z949h4EoD3WLK3t1qcqqyGoLxTU=; b=JnxZsTeRlkpGAeNVzMjBvMt7Um93iLPpsI45FFwBn30paVGGbNnEWH9M38MdENSm/kGngr DioDvnCcG1CcHf7FQaY8W0HEFG7aKNjvivi3Ap/HmVOb0RlNIIEAtXneeUIB3XUbbBvMbk zXCS+ZxYtK5OM8dZmOv8TRYohjVDer8= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1685617111; 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=MzXOzo95g617qUk7Z949h4EoD3WLK3t1qcqqyGoLxTU=; b=12MljAV3Jn4lWXoFOIkKiAO7uA5l6sXWVPVfp8DSkd5pTHVzE2MnGWF2CEZjuth948cp5s BtU9qfzM+5cVWrBw== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 122FA13A34; Thu, 1 Jun 2023 10:58:31 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id mmNoBNd5eGSCWAAAMHmgww (envelope-from ); Thu, 01 Jun 2023 10:58:31 +0000 Received: by quack3.suse.cz (Postfix, from userid 1000) id 2CDDBA0764; Thu, 1 Jun 2023 12:58:30 +0200 (CEST) From: Jan Kara To: Al Viro Cc: , Christian Brauner , Miklos Szeredi , "Darrick J. Wong" , Ted Tso , Jaegeuk Kim , , , linux-f2fs-devel@lists.sourceforge.net, Jan Kara Subject: [PATCH v2 6/6] fs: Restrict lock_two_nondirectories() to non-directory inodes Date: Thu, 1 Jun 2023 12:58:26 +0200 Message-Id: <20230601105830.13168-6-jack@suse.cz> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20230601104525.27897-1-jack@suse.cz> References: <20230601104525.27897-1-jack@suse.cz> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2200; i=jack@suse.cz; h=from:subject; bh=yzjONH0NaYO0JExUsRNFVNqF61b/6Z8qTkqJfHdGKlg=; b=owEBbQGS/pANAwAIAZydqgc/ZEDZAcsmYgBkeHnRAOKwOpYmoYaDVDZoAJJC7iZvp0hWjbPFBMUr e9B2zauJATMEAAEIAB0WIQSrWdEr1p4yirVVKBycnaoHP2RA2QUCZHh50QAKCRCcnaoHP2RA2ZLRB/ 9A5mErZNr1GSw4bvqyRiHpBJmYLCWR4lihVK9MrTDZk08vVOCpc8BAsxg5oODQk0iMm3VyWYYLKWrR tZpGfLNVVN9J+mp08tZRHTqzVmO2Vg1q/2eiHEQkWYSPHnJHAmAPXsS2XuUUkxDmK5B+rPgf+hKsFQ 5qg5tUZAuaUsZGy1zMAqXObFZSzjefBZrc251g++8ukB03T/LNLAVwtjvKgGmesBoq8BJdO93TYFlB INP8z2ollQ8Oqi7hSsJH2uhrQleqLb+y1+OfV/Ocf+LM4vBCuWoJGtGua+7Rg5bpG/kpJEXZmghiEY 6HGqXDo1+FmRvBPkx7nJT/lFffiE8I X-Developer-Key: i=jack@suse.cz; a=openpgp; fpr=93C6099A142276A28BBE35D815BC833443038D8C Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Currently lock_two_nondirectories() is skipping any passed directories. After vfs_rename() uses lock_two_inodes(), all the remaining four users of this function pass only regular files to it. So drop the somewhat unusual "skip directory" logic and instead warn if anybody passes directory to it. This also allows us to use lock_two_inodes() in lock_two_nondirectories() to concentrate the lock ordering logic in less places. Signed-off-by: Jan Kara --- fs/inode.c | 18 ++++++++---------- 1 file changed, 8 insertions(+), 10 deletions(-) diff --git a/fs/inode.c b/fs/inode.c index 4000ab08bbc0..e8d10fd18378 100644 --- a/fs/inode.c +++ b/fs/inode.c @@ -1148,7 +1148,7 @@ void lock_two_inodes(struct inode *inode1, struct inode *inode2, /** * lock_two_nondirectories - take two i_mutexes on non-directory objects * - * Lock any non-NULL argument that is not a directory. + * Lock any non-NULL argument. Passed objects must not be directories. * Zero, one or two objects may be locked by this function. * * @inode1: first inode to lock @@ -1156,13 +1156,9 @@ void lock_two_inodes(struct inode *inode1, struct inode *inode2, */ 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); + WARN_ON_ONCE(S_ISDIR(inode1->i_mode)); + WARN_ON_ONCE(S_ISDIR(inode2->i_mode)); + lock_two_inodes(inode1, inode2, I_MUTEX_NORMAL, I_MUTEX_NONDIR2); } EXPORT_SYMBOL(lock_two_nondirectories); @@ -1173,9 +1169,11 @@ EXPORT_SYMBOL(lock_two_nondirectories); */ void unlock_two_nondirectories(struct inode *inode1, struct inode *inode2) { - if (inode1 && !S_ISDIR(inode1->i_mode)) + WARN_ON_ONCE(S_ISDIR(inode1->i_mode)); + WARN_ON_ONCE(S_ISDIR(inode2->i_mode)); + if (inode1) inode_unlock(inode1); - if (inode2 && !S_ISDIR(inode2->i_mode) && inode2 != inode1) + if (inode2 && inode2 != inode1) inode_unlock(inode2); } EXPORT_SYMBOL(unlock_two_nondirectories);