From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 32006349B15; Sun, 20 Sep 2026 14:10:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789913446; cv=none; b=WFgxvYZJx4Vy9ZNoHFcaQEruwOkZ3YDj2LRefPShSr9VR+kbjV2W6qC5ricy5FSJycLgBPrf8m55DUgRHRv6qsnqvnIQLSQzJfJ1DNjEQ6JVZYBbKgIzXVb8vOxvryMhCSV2tT8mA24sT0lmrzuX6luU7KyBtFoQ0fm2MXWvpJI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789913446; c=relaxed/simple; bh=2IbgxxtBZJ9rQLYwiDjkkwArWTmIa3n8reudQLDHi+k=; h=Message-ID:Date:MIME-Version:Subject:To:References:From: In-Reply-To:Content-Type; b=V3p+koU7KPxNGsgpY3dnUfH+8pbOUQUP0IpN7ew40T8u4r2GVsuWgQF4nBG/TST/tmhs5yDBr+u+MgkufLOpGnMyR3yIZhH+klcysmWHT9c2HMkS0R6oOpBnCl03J7ZPE8whpzWofzyYh8fWubH+2boQBDJ0NNRH5EEfy807M+g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=OY14vxyo; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="OY14vxyo" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 158EC1F000FF; Sun, 20 Sep 2026 14:10:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789913444; bh=L9U8x29FUMYYuun6BO6TXnYXUZdKJvqLoY6TjdR/gGg=; h=Date:Subject:To:References:From:In-Reply-To; b=OY14vxyofU4iSX/+urwWgT4p8rLI95Hj5FWX4subo5GURa0SrjeP7fS6DWA7YBOQz i1O2qFs410fkP5MFiDlObENnIjMrVl98e0lHlIPRev+rKcXQBfV5B+gnonpsb4DZGr BYDt5ZPzD1LHOs3bf9QFN3T/mcIrCPFH74okdOKSQ+1FNUcu1s+GV6QI/0MrCvFfXS O5/t6Hj6w6rdkHMAsKCBRTq1PmglCWdlqDn6QjDQM8vEcXXKadYRLwkWaPyB8PCINq H3fn8qdPEDV4NMRpBcQHh2+PbbI6TBgazZI0VILZPRxEeiMIovMn+ITMsw4I1mCrX+ II09xWKQycbhg== Message-ID: Date: Sun, 20 Sep 2026 22:10:40 +0800 Precedence: bulk X-Mailing-List: linux-ext4@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v8 08/13] fstests: verify f_fsid for cloned filesystems To: fstests@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, djwong@kernel.org References: Content-Language: en-US From: Anand Suveer Jain In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 2/9/26 02:51, Zorro Lang wrote: > On Sat, Jul 25, 2026 at 03:39:05PM +0800, Anand Jain wrote: >> Verify that the cloned filesystem provides an f_fsid that is persistent >> across mount cycles, yet unique from the original filesystem's f_fsid. >> >> Signed-off-by: Anand Jain >> --- >> tests/generic/802 | 64 +++++++++++++++++++++++++++++++++++++++++++ >> tests/generic/802.out | 4 +++ >> 2 files changed, 68 insertions(+) >> create mode 100644 tests/generic/802 >> create mode 100644 tests/generic/802.out >> >> diff --git a/tests/generic/802 b/tests/generic/802 >> new file mode 100644 >> index 000000000000..910807c11584 >> --- /dev/null >> +++ b/tests/generic/802 >> @@ -0,0 +1,64 @@ >> +#! /bin/bash >> +# SPDX-License-Identifier: GPL-2.0 >> +# Copyright (c) 2026 Anand Jain . All Rights Reserved. >> +# >> +# FS QA Test 802 >> +# Check that the cloned filesystem provides an f_fsid that is persistent >> +# across mount cycles if the block device maj:min remains unchanged. >> + >> +. ./common/preamble >> + >> +_begin_fstest auto quick mount clone >> + >> +_require_test >> +_require_block_device $TEST_DEV >> +_require_loop >> + >> +_fixed_by_fs_commit btrfs xxxxxxxxxxxx \ >> + "btrfs: use on-disk uuid for s_uuid in temp_fsid mounts" >> +_fixed_by_fs_commit btrfs xxxxxxxxxxxx \ >> + "btrfs: derive f_fsid from on-disk fsuuid and dev_t" >> + >> +_cleanup() >> +{ >> + cd / >> + rm -r -f $tmp.* >> + umount $mnt1 $mnt2 2>/dev/null >> + _loop_image_destroy "${devs[@]}" 2> /dev/null >> +} >> + >> +# Setup base loop device and its clone >> +devs=() >> +_loop_image_create_clone devs >> +mkdir -p $TEST_DIR/$seq > > Better to `rm -rf $TEST_DIR/$seq` before creating a new one. > Applied. >> +mnt1=$TEST_DIR/$seq/mnt1 >> +mnt2=$TEST_DIR/$seq/mnt2 >> +mkdir -p $mnt1 >> +mkdir -p $mnt2 >> + >> +# Mount both filesystems simultaneously using mandatory clone mount options >> +_mount $(_common_dev_mount_options) $(_clone_mount_option) ${devs[0]} $mnt1 || \ >> + _fail "Failed to mount dev1" >> +_mount $(_common_dev_mount_options) $(_clone_mount_option) ${devs[1]} $mnt2 || \ >> + _fail "Failed to mount dev2" >> + >> +# Capture baseline filesystem IDs for comparison >> +fsid_scratch=$(stat -f -c "%i" $mnt1) >> +fsid_clone=$(stat -f -c "%i" $mnt2) >> + >> +# Verify that the fsids remain stable after a mount cycle, even when the >> +# mount order is reversed. >> +echo "**** fsid after mount cycle ****" >> +_unmount $mnt1 >> +_unmount $mnt2 >> +_mount $(_common_dev_mount_options) $(_clone_mount_option) ${devs[1]} $mnt2 || \ >> + _fail "Failed to mount dev2" >> +_mount $(_common_dev_mount_options) $(_clone_mount_option) ${devs[0]} $mnt1 || \ >> + _fail "Failed to mount dev1" >> + >> +# Compare post mount-cycle values against the baseline >> +stat -f -c "%i" $mnt1 | sed -e "s/$fsid_scratch/FSID_SCRATCH/g" >> +stat -f -c "%i" $mnt2 | sed -e "s/$fsid_clone/FSID_CLONE/g" > > Hmm... what if "$fsid_scratch" is same with "$fsid_clone"? > That falls into the same category as ext4 (and likely Btrfs as well, pending a regression report fix that is delaying this fstests patch as well), where both the original and cloned filesystems share the same `f_fsid`. However, since the objective of this test case is to verify consistency within the filesystem across reboots, this behavior is fine. >> + >> +status=0 >> +exit > > _exit 0 Applied. > >> diff --git a/tests/generic/802.out b/tests/generic/802.out >> new file mode 100644 >> index 000000000000..0202a9a2c108 >> --- /dev/null >> +++ b/tests/generic/802.out >> @@ -0,0 +1,4 @@ >> +QA output created by 802 >> +**** fsid after mount cycle **** >> +FSID_SCRATCH >> +FSID_CLONE >> -- >> 2.43.0 >>