Re: [PATCH v2 04/10] btrfs: verify that subvolume mounts are unaffected by tempfsid

[Anand Jain <anand.jain@oracle.com>]

On 2/20/24 22:00, Filipe Manana wrote:
> On Mon, Feb 19, 2024 at 7:49 PM Anand Jain <anand.jain@oracle.com> wrote:
>>
>> The tempfsid logic must determine whether the incoming mount request
>> is for a device already mounted or a new device mount. Verify that it
>> recognizes the device already mounted well by creating reflink across
>> the subvolume mount points.
>>
>> Signed-off-by: Anand Jain <anand.jain@oracle.com>
>> ---
>> v2:
>> add subvol group
>> use $UMOUNT_PROG
>> remove _fail for _cp_reflink
>>
>>   tests/btrfs/311     | 89 +++++++++++++++++++++++++++++++++++++++++++++
>>   tests/btrfs/311.out | 24 ++++++++++++
>>   2 files changed, 113 insertions(+)
>>   create mode 100755 tests/btrfs/311
>>   create mode 100644 tests/btrfs/311.out
>>
>> diff --git a/tests/btrfs/311 b/tests/btrfs/311
>> new file mode 100755
>> index 000000000000..cebbc3a59e6a
>> --- /dev/null
>> +++ b/tests/btrfs/311
>> @@ -0,0 +1,89 @@
>> +#! /bin/bash
>> +# SPDX-License-Identifier: GPL-2.0
>> +# Copyright (c) 2024 Oracle. All Rights Reserved.
>> +#
>> +# FS QA Test 311
>> +#
>> +# Mount the device twice check if the reflink works, this helps to
>> +# ensure device is mounted as the same device.
>> +#
>> +. ./common/preamble
>> +_begin_fstest auto quick subvol tempfsid
>> +
>> +# Override the default cleanup function.
>> +_cleanup()
>> +{
>> +       cd /
>> +       $UMOUNT_PROG $mnt1 > /dev/null 2>&1
>> +       rm -r -f $tmp.*
>> +       rm -r -f $mnt1
>> +}
>> +
>> +. ./common/filter.btrfs
>> +. ./common/reflink
>> +
>> +# Modify as appropriate.
>> +_supported_fs btrfs
>> +_require_cp_reflink
>> +_require_btrfs_sysfs_fsid
>> +_require_btrfs_fs_feature temp_fsid
>> +_require_btrfs_command inspect-internal dump-super
>> +_require_scratch
>> +
>> +mnt1=$TEST_DIR/$seq/mnt1
>> +mkdir -p $mnt1
>> +
>> +same_dev_mount()
>> +{
>> +       echo ---- $FUNCNAME ----
>> +
>> +       _scratch_mkfs >> $seqres.full 2>&1
>> +
>> +       _scratch_mount
>> +       $XFS_IO_PROG -fc 'pwrite -S 0x61 0 9000' $SCRATCH_MNT/foo | \
>> +                                                               _filter_xfs_io
>> +
>> +       echo Mount the device again to a different mount point
>> +       _mount $SCRATCH_DEV $mnt1
>> +
>> +       _cp_reflink $SCRATCH_MNT/foo $mnt1/bar
>> +       echo Checksum of reflinked files
>> +       md5sum $SCRATCH_MNT/foo | _filter_scratch
>> +       md5sum $mnt1/bar | _filter_test_dir
>> +
>> +       check_fsid $SCRATCH_DEV
>> +}
>> +
>> +same_dev_subvol_mount()
>> +{
>> +       echo ---- $FUNCNAME ----
>> +       _scratch_mkfs >> $seqres.full 2>&1
>> +
>> +       _scratch_mount
>> +       $BTRFS_UTIL_PROG subvolume create $SCRATCH_MNT/subvol
> 
> Need to use: | _filter_scratch
> See the golden output below.
> 
>> +
>> +       $XFS_IO_PROG -fc 'pwrite -S 0x61 0 9000' $SCRATCH_MNT/subvol/foo | \
>> +                                                               _filter_xfs_io
>> +
>> +       echo Mounting a subvol
>> +       _mount -o subvol=subvol $SCRATCH_DEV $mnt1
>> +
>> +       _cp_reflink $SCRATCH_MNT/subvol/foo $mnt1/bar
>> +       echo Checksum of reflinked files
>> +       md5sum $SCRATCH_MNT/subvol/foo | _filter_scratch
>> +       md5sum $mnt1/bar | _filter_test_dir
>> +
>> +       check_fsid $SCRATCH_DEV
>> +}
>> +
>> +same_dev_mount
>> +
>> +_scratch_unmount
>> +_cleanup
>> +mkdir -p $mnt1
>> +
>> +same_dev_subvol_mount
>> +
>> +# success, all done
>> +status=0
>> +exit
>> diff --git a/tests/btrfs/311.out b/tests/btrfs/311.out
>> new file mode 100644
>> index 000000000000..8787f24ab867
>> --- /dev/null
>> +++ b/tests/btrfs/311.out
>> @@ -0,0 +1,24 @@
>> +QA output created by 311
>> +---- same_dev_mount ----
>> +wrote 9000/9000 bytes at offset 0
>> +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
>> +Mount the device again to a different mount point
>> +Checksum of reflinked files
>> +42d69d1a6d333a7ebdf64792a555e392  SCRATCH_MNT/foo
>> +42d69d1a6d333a7ebdf64792a555e392  TEST_DIR/311/mnt1/bar
>> +On disk fsid:          FSID
>> +Metadata uuid:         FSID
>> +Temp fsid:             FSID
>> +Tempfsid status:       0
>> +---- same_dev_subvol_mount ----
>> +Create subvolume '/mnt/scratch/subvol'
> 
> Because of this...
> 
> Otherwise it looks fine.
> 
> With that corrected:
> 
> Reviewed-by: Filipe Manana <fdmanana@suse.com>
> 

  Fixed this locally. Thanks, Anand