From patchwork Mon Mar 1 16:11:48 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 390234 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,DKIMWL_WL_HIGH, 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=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 540FDC433DB for ; Mon, 1 Mar 2021 16:31:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 076B164F9F for ; Mon, 1 Mar 2021 16:31:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232384AbhCAQbZ (ORCPT ); Mon, 1 Mar 2021 11:31:25 -0500 Received: from mail.kernel.org ([198.145.29.99]:59992 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233907AbhCAQ0n (ORCPT ); Mon, 1 Mar 2021 11:26:43 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 6BC5C64EDF; Mon, 1 Mar 2021 16:22:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1614615722; bh=1pQvcjsLn1hyuWuG3IYWJqdnk198cx+QlxgmKMLq+pE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=a32xYpQRDMVwfmBQ+OxW+CJjpTwfQwukvTl3wCKYIoqW//71xb4D3OMjmMw0cwqZR 5IoqFMSF4GBanhDxbV96tIbTZDamgs30ZoW82R4NCUzw5jn77Wnl0ga7OzMP9nHJms 2njbXuL+P6sjSQRkdvswcehhjJ8h8MXK4inBC/pI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Shyam Prasad N , Aurelien Aptel , Steve French , Sasha Levin Subject: [PATCH 4.9 007/134] cifs: Set CIFS_MOUNT_USE_PREFIX_PATH flag on setting cifs_sb->prepath. Date: Mon, 1 Mar 2021 17:11:48 +0100 Message-Id: <20210301161013.942524168@linuxfoundation.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210301161013.585393984@linuxfoundation.org> References: <20210301161013.585393984@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Shyam Prasad N [ Upstream commit a738c93fb1c17e386a09304b517b1c6b2a6a5a8b ] While debugging another issue today, Steve and I noticed that if a subdir for a file share is already mounted on the client, any new mount of any other subdir (or the file share root) of the same share results in sharing the cifs superblock, which e.g. can result in incorrect device name. While setting prefix path for the root of a cifs_sb, CIFS_MOUNT_USE_PREFIX_PATH flag should also be set. Without it, prepath is not even considered in some places, and output of "mount" and various /proc/<>/*mount* related options can be missing part of the device name. Signed-off-by: Shyam Prasad N Reviewed-by: Aurelien Aptel Signed-off-by: Steve French Signed-off-by: Sasha Levin --- fs/cifs/connect.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index af78de9ef036c..8508dc8270593 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -3488,6 +3488,7 @@ int cifs_setup_cifs_sb(struct smb_vol *pvolume_info, cifs_sb->prepath = kstrdup(pvolume_info->prepath, GFP_KERNEL); if (cifs_sb->prepath == NULL) return -ENOMEM; + cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH; } return 0;