Re: [PATCH] fstests: btrfs: test setting compression via xattr on nodatacow files

[Nikolay Borisov <nborisov@suse.com>]

On 18.04.22 г. 10:54 ч., Chung-Chiang Cheng wrote:
> Compression and nodatacow are mutually exclusive. Besides ioctl, there
> is another way to setting compression via xattrs, and shouldn't produce
> invalid combinations.
> 
> Signed-off-by: Chung-Chiang Cheng <cccheng@synology.com>
> ---
>   tests/btrfs/264     | 76 +++++++++++++++++++++++++++++++++++++++++++++
>   tests/btrfs/264.out | 15 +++++++++
>   2 files changed, 91 insertions(+)
>   create mode 100755 tests/btrfs/264
>   create mode 100644 tests/btrfs/264.out
> 
> diff --git a/tests/btrfs/264 b/tests/btrfs/264
> new file mode 100755
> index 000000000000..42bfcd4f93a0
> --- /dev/null
> +++ b/tests/btrfs/264
> @@ -0,0 +1,76 @@
> +#! /bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright (C) 2022 Synology Inc. All Rights Reserved.
> +#
> +# FS QA Test No. 264
> +#
> +# Compression and nodatacow are mutually exclusive. Besides ioctl, there
> +# is another way to setting compression via xattrs, and shouldn't produce
> +# invalid combinations.
> +#
> +# To prevent mix any compression-related options with nodatacow, FS_NOCOMP_FL
> +# is also rejected by ioctl as well as FS_COMPR_FL on nodatacow files. To
> +# align with it, no and none are also unacceptable in this test.
> +#
> +# The regression is fixed by a patch with the following subject:
> +#   btrfs: do not allow compression on nodatacow files
> +#
> +. ./common/preamble
> +_begin_fstest auto quick compress attr
> +
> +# Import common functions.
> +. ./common/filter
> +. ./common/attr
> +
> +# real QA test starts here
> +
> +_supported_fs btrfs
> +_require_scratch
> +_require_chattr C
> +_require_chattr c
> +
> +_scratch_mkfs >>$seqres.full 2>&1
> +_scratch_mount
> +
> +#
> +# DATACOW
> +#
> +test_file="$SCRATCH_MNT/foo"
> +touch "$test_file"
> +$CHATTR_PROG -C "$test_file"
> +$LSATTR_PROG -l "$test_file" | _filter_scratch
> +
> +$SETFATTR_PROG -n "btrfs.compression" -v zlib "$test_file" |& _filter_scratch

In my testing setfattr doesn't produce any output, so why the 
_filter_scratch ?

> +$LSATTR_PROG -l "$test_file" | _filter_scratch

This (as all other lsattr lines) fail for me because of difference in 
output - in your golden file there is a single space char between the 
filename and its state whilst lsattr produces a number of spaces. So in 
addition to filter_scratch this needs _filter_spaces as well :

+$LSATTR_PROG -l "$test_file" | _filter_scratch | _filter_spaces

> +$SETFATTR_PROG -n "btrfs.compression" -v no   "$test_file" |& _filter_scratch
> +$LSATTR_PROG -l "$test_file" | _filter_scratch
> +$SETFATTR_PROG -n "btrfs.compression" -v lzo  "$test_file" |& _filter_scratch
> +$LSATTR_PROG -l "$test_file" | _filter_scratch
> +$SETFATTR_PROG -n "btrfs.compression" -v none "$test_file" |& _filter_scratch
> +$LSATTR_PROG -l "$test_file" | _filter_scratch
> +$SETFATTR_PROG -n "btrfs.compression" -v zstd "$test_file" |& _filter_scratch
> +$LSATTR_PROG -l "$test_file" | _filter_scratch
> +
> +
> +#
> +# NODATACOW
> +#
> +test_file="$SCRATCH_MNT/bar"
> +touch "$test_file"
> +$CHATTR_PROG +C "$test_file"
> +$LSATTR_PROG -l "$test_file" | _filter_scratch
> +
> +# all valid compression type are not allowed on nodatacow files
> +$SETFATTR_PROG -n "btrfs.compression" -v zlib "$test_file" |& _filter_scratch
> +$SETFATTR_PROG -n "btrfs.compression" -v lzo  "$test_file" |& _filter_scratch
> +$SETFATTR_PROG -n "btrfs.compression" -v zstd "$test_file" |& _filter_scratch
> +$LSATTR_PROG -l "$test_file" | _filter_scratch
> +
> +# no/none are also not allowed on nodatacow files
> +$SETFATTR_PROG -n "btrfs.compression" -v no   "$test_file" |& _filter_scratch
> +$SETFATTR_PROG -n "btrfs.compression" -v none "$test_file" |& _filter_scratch
> +$LSATTR_PROG -l "$test_file" | _filter_scratch
> +
> +# success, all done
> +status=0
> +exit
> diff --git a/tests/btrfs/264.out b/tests/btrfs/264.out
> new file mode 100644
> index 000000000000..82c551411411
> --- /dev/null
> +++ b/tests/btrfs/264.out
> @@ -0,0 +1,15 @@
> +QA output created by 264
> +SCRATCH_MNT/foo ---
> +SCRATCH_MNT/foo Compression_Requested
> +SCRATCH_MNT/foo ---
> +SCRATCH_MNT/foo Compression_Requested
> +SCRATCH_MNT/foo ---
> +SCRATCH_MNT/foo Compression_Requested
> +SCRATCH_MNT/bar No_COW
> +setfattr: SCRATCH_MNT/bar: Invalid argument
> +setfattr: SCRATCH_MNT/bar: Invalid argument
> +setfattr: SCRATCH_MNT/bar: Invalid argument
> +SCRATCH_MNT/bar No_COW
> +setfattr: SCRATCH_MNT/bar: Invalid argument
> +setfattr: SCRATCH_MNT/bar: Invalid argument
> +SCRATCH_MNT/bar No_COW