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=-13.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 C5447C433DF for ; Mon, 24 Aug 2020 09:27:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A5E912074D for ; Mon, 24 Aug 2020 09:27:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598261256; bh=uWAVItaEtN1KbR+X2t+2V6dYQWvx+SdeH4DwBSc9XsQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=kmlkxmuOxYDm53hLE8jNMI5m3D+S7DLToERI+2eD8zVBqhcUDUL0owl0FuCrC1XVP 1le6TFkYZ1pEAteO1//KXLlxT2bJufyP74nptnqFvROixv9+SxqnQfxcZ3G6GcR22n 1ncgxcI9/3p8hLEyYxCAUi9xItuSvLf1cvtwFJKE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730056AbgHXIwK (ORCPT ); Mon, 24 Aug 2020 04:52:10 -0400 Received: from mail.kernel.org ([198.145.29.99]:57834 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730039AbgHXIwE (ORCPT ); Mon, 24 Aug 2020 04:52:04 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 076B92075B; Mon, 24 Aug 2020 08:52:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598259124; bh=uWAVItaEtN1KbR+X2t+2V6dYQWvx+SdeH4DwBSc9XsQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rC0tJ4XyniN45EvVCsZveOk9+9J+ewcU2LCQoufTuO0Ju3eghmgXvAIWFrA+95Z1e K93VY4N8dV+rgHxfQl3S3yrqkQSeBydOv2CSb2FhXJj/gp1YhBLjfrv4YVw1Ji9bae hnjzHof05Yz2PGLFZgsaASJ0b2W8ptdLNwE7UuuE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Chris Murphy , Josef Bacik , David Sterba , Sasha Levin Subject: [PATCH 4.9 10/39] btrfs: dont show full path of bind mounts in subvol= Date: Mon, 24 Aug 2020 10:31:09 +0200 Message-Id: <20200824082348.996775982@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200824082348.445866152@linuxfoundation.org> References: <20200824082348.445866152@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Josef Bacik [ Upstream commit 3ef3959b29c4a5bd65526ab310a1a18ae533172a ] Chris Murphy reported a problem where rpm ostree will bind mount a bunch of things for whatever voodoo it's doing. But when it does this /proc/mounts shows something like /dev/sda /mnt/test btrfs rw,relatime,subvolid=256,subvol=/foo 0 0 /dev/sda /mnt/test/baz btrfs rw,relatime,subvolid=256,subvol=/foo/bar 0 0 Despite subvolid=256 being subvol=/foo. This is because we're just spitting out the dentry of the mount point, which in the case of bind mounts is the source path for the mountpoint. Instead we should spit out the path to the actual subvol. Fix this by looking up the name for the subvolid we have mounted. With this fix the same test looks like this /dev/sda /mnt/test btrfs rw,relatime,subvolid=256,subvol=/foo 0 0 /dev/sda /mnt/test/baz btrfs rw,relatime,subvolid=256,subvol=/foo 0 0 Reported-by: Chris Murphy CC: stable@vger.kernel.org # 4.4+ Signed-off-by: Josef Bacik Reviewed-by: David Sterba Signed-off-by: David Sterba Signed-off-by: Sasha Levin --- fs/btrfs/super.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index af5be060c651f..3a0cb745164f8 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -1225,6 +1225,7 @@ static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb); struct btrfs_root *root = info->tree_root; char *compress_type; + const char *subvol_name; if (btrfs_test_opt(info, DEGRADED)) seq_puts(seq, ",degraded"); @@ -1311,8 +1312,13 @@ static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) #endif seq_printf(seq, ",subvolid=%llu", BTRFS_I(d_inode(dentry))->root->root_key.objectid); - seq_puts(seq, ",subvol="); - seq_dentry(seq, dentry, " \t\n\\"); + subvol_name = btrfs_get_subvol_name_from_objectid(info, + BTRFS_I(d_inode(dentry))->root->root_key.objectid); + if (!IS_ERR(subvol_name)) { + seq_puts(seq, ",subvol="); + seq_escape(seq, subvol_name, " \t\n\\"); + kfree(subvol_name); + } return 0; } -- 2.25.1