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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B2424C433EF for ; Wed, 11 May 2022 01:31:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232126AbiEKBbe (ORCPT ); Tue, 10 May 2022 21:31:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42196 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240480AbiEKBb0 (ORCPT ); Tue, 10 May 2022 21:31:26 -0400 Received: from mail-pj1-x1030.google.com (mail-pj1-x1030.google.com [IPv6:2607:f8b0:4864:20::1030]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9836845AD2 for ; Tue, 10 May 2022 18:31:24 -0700 (PDT) Received: by mail-pj1-x1030.google.com with SMTP id w17-20020a17090a529100b001db302efed6so687800pjh.4 for ; Tue, 10 May 2022 18:31:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=wQmwATZBlwPgfe8/IGykSqfJ1WJmNhS7AYJLIfu/Nbs=; b=jdvdOCo2qk6heSQztmRcF899GenupEv0QQQh1lywcGwx6Kpf9sxQcL2o94zB9sDFRG Jth1x3ZXgTgq27nABt9ux9Q5QOzYmdZi8r6Ttw6qfkL8CmbXuG2bSSeoBMBIZtSszFgq ftr4Qoc7Ed9l8CpFJ00KYOZ+j8e5+w+M+gDFE= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=wQmwATZBlwPgfe8/IGykSqfJ1WJmNhS7AYJLIfu/Nbs=; b=Wv9TI5xA+qzhV/Oa220fjsSuzQ0Fj2EuakK2Z0jVlMJNvfnylAQUzN/crKtriGjOyI E3oUDGdEOTw8/Fw7zsH60MUoEPsyxZo0g6NkZ/kK0+vhBj2d02KqZuIsEVNOQWNVHscu M47K+428JfJJ5kjql6i+T4hrggAepNsb/MN+wBkWidJU69QhoarahKgGt4DLRWWMf/RI oi4iCNG1ZX3zne29sGfREn0nkHX1TKBUBlkPEqUqh4FCgh5z39CEp+Ww5eV/SY8gl6gH 9W0zRsiCfei1h4IuFERj01bf3Rhzj3axYZzKml4wuUYneAS1VB55069NozMpF7FXubMN PJCQ== X-Gm-Message-State: AOAM530Ea+D7eToiFI8eZts5W0epyqdkMfmYJzEyI9Eq6dWATuJhoKk+ Wx1dIiNdHFfAA4aHMTUWDj3ZGw== X-Google-Smtp-Source: ABdhPJwStc3JS5ugin6DYuNIOemCa2wJPbZeDEGecbfHJpVUVx+kYkZovA4pUxJSJoOwQ6w/IkIZqA== X-Received: by 2002:a17:902:7fc9:b0:15f:2afd:82f3 with SMTP id t9-20020a1709027fc900b0015f2afd82f3mr3976685plb.91.1652232684169; Tue, 10 May 2022 18:31:24 -0700 (PDT) Received: from dlunevwfh.roam.corp.google.com (n122-107-196-14.sbr2.nsw.optusnet.com.au. [122.107.196.14]) by smtp.gmail.com with ESMTPSA id a4-20020a17090aa50400b001cd4989feecsm2494749pjq.56.2022.05.10.18.31.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 May 2022 18:31:23 -0700 (PDT) From: Daniil Lunev To: linux-fsdevel@vger.kernel.org Cc: fuse-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, Daniil Lunev , Alexander Viro Subject: [PATCH 1/2] fs/super: Add a flag to mark super block defunc Date: Wed, 11 May 2022 11:30:56 +1000 Message-Id: <20220511113050.1.Ifc059f4eca1cce3e2cc79818467c94f65e3d8dde@changeid> X-Mailer: git-send-email 2.31.0 In-Reply-To: <20220511013057.245827-1-dlunev@chromium.org> References: <20220511013057.245827-1-dlunev@chromium.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org File system can mark a block "defunc" in order to prevent matching against it in a new mount. Signed-off-by: Daniil Lunev --- fs/super.c | 4 ++-- include/linux/fs.h | 1 + 2 files changed, 3 insertions(+), 2 deletions(-) diff --git a/fs/super.c b/fs/super.c index f1d4a193602d6..fc5b3efe0cd01 100644 --- a/fs/super.c +++ b/fs/super.c @@ -1216,7 +1216,7 @@ static int set_bdev_super_fc(struct super_block *s, struct fs_context *fc) static int test_bdev_super_fc(struct super_block *s, struct fs_context *fc) { - return s->s_bdev == fc->sget_key; + return !s->s_defunc && s->s_bdev == fc->sget_key; } /** @@ -1307,7 +1307,7 @@ EXPORT_SYMBOL(get_tree_bdev); static int test_bdev_super(struct super_block *s, void *data) { - return (void *)s->s_bdev == data; + return !s->s_defunc && (void *)s->s_bdev == data; } struct dentry *mount_bdev(struct file_system_type *fs_type, diff --git a/include/linux/fs.h b/include/linux/fs.h index bbde95387a23a..76feb3fe9bb9e 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -1448,6 +1448,7 @@ struct super_block { struct rw_semaphore s_umount; int s_count; atomic_t s_active; + bool s_defunc; #ifdef CONFIG_SECURITY void *s_security; #endif -- 2.31.0