From nobody Sun Feb 8 23:03:56 2026 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 5D1A2C001B0 for ; Wed, 19 Jul 2023 16:23:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229831AbjGSQXD (ORCPT ); Wed, 19 Jul 2023 12:23:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45210 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229749AbjGSQWx (ORCPT ); Wed, 19 Jul 2023 12:22:53 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A0D401734; Wed, 19 Jul 2023 09:22:52 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 335C261788; Wed, 19 Jul 2023 16:22:52 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6FB56C433CA; Wed, 19 Jul 2023 16:22:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1689783771; bh=K6oAnsvQEIZrftCXh7mBn5FA+pVc8rhUAGklED1yUHw=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=qZv8/kh4Iyuuiswu7oyZwUcv4dJT5RoNFpwxVuluWlCwCWmretLUk5PaKDIhLDoBR j902l4VPO1zqp8LwQm0lCqOiPKrAzD88mBt8H/3HsjOnXfwPOau7uGUwOyJXJ8FPdH ErbPXrOPlV3q/wjdLlC68hlxxNlKjHjaHuHdJGCEUdjAuaQLrbjH9N6CNqITucpcgE K6EzBQV/GhH1UsrcxCeyAw1jTqSI8O3eV4OCzu6HqKyPXYvyr1A/UqiPIwIdudQaTJ yLmvBN2oR94w8cW7zvq7I4rlg311Ez1B4W3U4Fkv3lOhC6fnGPce7rWM0hkRTyEwDO is0D+7MER80lg== From: Eric Van Hensbergen Date: Wed, 19 Jul 2023 16:22:30 +0000 Subject: [PATCH v4 1/4] fs/9p: remove unnecessary and overrestrictive check MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20230716-fixes-overly-restrictive-mmap-v4-1-a3cd1cd32af2@kernel.org> References: <20230716-fixes-overly-restrictive-mmap-v4-0-a3cd1cd32af2@kernel.org> In-Reply-To: <20230716-fixes-overly-restrictive-mmap-v4-0-a3cd1cd32af2@kernel.org> To: Latchesar Ionkov , Dominique Martinet , Christian Schoenebeck Cc: v9fs@lists.linux.dev, linux-kernel@vger.kernel.org, kernel@pengutronix.de, stable@vger.kernel.org, Robert Schwebel , Eric Van Hensbergen X-Mailer: b4 0.12.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1223; i=ericvh@kernel.org; h=from:subject:message-id; bh=K6oAnsvQEIZrftCXh7mBn5FA+pVc8rhUAGklED1yUHw=; b=owEBbQKS/ZANAwAKAYj/1ftKX/+YAcsmYgBkuA3YMIjmuoMKqeY2BsmWo6nZ5varMUeKrXq1A ZgW9vAkk0SJAjMEAAEKAB0WIQSWlvDRlqWQmKTK0VGI/9X7Sl//mAUCZLgN2AAKCRCI/9X7Sl// mLVmD/0YVO3O0CHQoWPMnoGtCl1BrCJgi4NkTHU1J4rP0H9hKOJ8OUaephCEQ1KU3WZzKEKMK/b uYtwMcqyqd+PX70SbCMFlQhZxsiiNOvDtUpaOVC89rTozUMorggCYvVr95NmQ80HlViSHCadvIX K4i1W+sMcga84ViNqDgt+mFn0urJ6z44hs6skVwcIDDImceU9lunAM2BejqtK3w0AFkMXEzqnOX SdMeV03rF6zVFwK7/7xACx+dx0MJVlC/UP6o7KLTTkoU0Nzr4hB4ZqaCy61b8vMqUln7lVRxZaZ jk0zwMV+5XN0KBN7eb6WtzDeURR97FOLTww1chVWjIaO2W8mNc4z16eSuDHMTk7ZlxkTM6avVSv Kqb7YDf5brbCHsuQb/FjwBM1Fq44newsqNlWNVbSIhrRczmt4xD1eRU+B6mfr59IvMOcW5jPEiR kzuQevXCHkBmxgMLUXg0cLPCSr8non0kUbz1NQAkU6Ba5mLopt8keYqdr7DeH2blqkUKdRfLp6q BHaw4Yjh+y/g62WWlkuHNOfSngAdz4T8tse1IQVoKMbsUiXt9Iof6lBMRPhCLnIGoF/K3pIcLDc +mdwaVFmkNp3LYDpIzCwjgUoIYp2gGOZLJsVW0/izToqd0mxVBlXPYXrOgb+ANu0prCENGMgOZ2 gwFRnjJFnsjC0zw== X-Developer-Key: i=ericvh@kernel.org; a=openpgp; fpr=9696F0D196A59098A4CAD15188FFD5FB4A5FFF98 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This eliminates a check for shared that was overrestrictive and prevented read-only mmaps when writeback caches weren't enabled. Cc: stable@vger.kernel.org Fixes: 1543b4c5071c ("fs/9p: remove writeback fid and fix per-file modes") Reported-by: Robert Schwebel Closes: https://lore.kernel.org/v9fs/ZK25XZ%2BGpR3KHIB%2F@pengutronix.de Reviewed-by: Dominique Martinet Reviewed-by: Christian Schoenebeck Signed-off-by: Eric Van Hensbergen --- fs/9p/vfs_file.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c index 2996fb00387f..9b61b480a9b0 100644 --- a/fs/9p/vfs_file.c +++ b/fs/9p/vfs_file.c @@ -505,9 +505,7 @@ v9fs_file_mmap(struct file *filp, struct vm_area_struct= *vma) p9_debug(P9_DEBUG_MMAP, "filp :%p\n", filp); =20 if (!(v9ses->cache & CACHE_WRITEBACK)) { - p9_debug(P9_DEBUG_CACHE, "(no mmap mode)"); - if (vma->vm_flags & VM_MAYSHARE) - return -ENODEV; + p9_debug(P9_DEBUG_CACHE, "(read-only mmap mode)"); invalidate_inode_pages2(filp->f_mapping); return generic_file_readonly_mmap(filp, vma); } --=20 2.39.2