Re: [PATCH 2/2] generic: Addition of new tests for extsize hints

["Darrick J. Wong" <djwong@kernel.org>]

On Wed, Oct 23, 2024 at 12:56:20AM +0530, Nirjhar Roy wrote:
> This commit adds new tests that checks the behaviour of xfs/ext4
> filesystems when extsize hint is set on file with inode size as 0, non-empty
> files with allocated and delalloc extents and so on.
> Although currently this test is placed under tests/generic, it
> only runs on xfs and there is an ongoing patch series[1] to enable
> extsize hints for ext4 as well.
> 
> [1] https://lore.kernel.org/linux-ext4/cover.1726034272.git.ojaswin@linux.ibm.com/
> 
> Suggested-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
> Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
> Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
> Signed-off-by: Nirjhar Roy <nirjhar@linux.ibm.com>
> ---
>  tests/generic/365     | 156 ++++++++++++++++++++++++++++++++++++++++++
>  tests/generic/365.out |  26 +++++++
>  2 files changed, 182 insertions(+)
>  create mode 100755 tests/generic/365
>  create mode 100644 tests/generic/365.out
> 
> diff --git a/tests/generic/365 b/tests/generic/365
> new file mode 100755
> index 00000000..85a7ce9a
> --- /dev/null
> +++ b/tests/generic/365
> @@ -0,0 +1,156 @@
> +#! /bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright (c) 2024 Nirjhar Roy (nirjhar@linux.ibm.com).  All Rights Reserved.
> +#
> +# FS QA Test 365
> +#
> +# This test verifies that extent allocation hint setting works correctly on files with
> +# no extents allocated and non-empty files which are truncated. It also checks that the
> +# extent hints setting fails with non-empty file i.e, with any file with allocated
> +# extents or delayed allocation. We also check if the extsize value and the
> +# xflag bit actually got reflected after setting/re-setting the extsize value.
> +
> +. ./common/config
> +. ./common/filter
> +. ./common/preamble
> +. ./common/xfs
> +
> +_begin_fstest ioctl quick
> +
> +_supported_fs xfs
> +
> +_fixed_by_kernel_commit XXXXXXXXXXXX \
> +    "xfs: Check for delayed allocations before setting extsize",
> +
> +_require_scratch
> +
> +FILE_DATA_SIZE=1M

Do these tests work correctly with fsblock size of 64k?  Just curious
since Pankaj just sent a series doing 1M -> 4M bumps to fix quota
issues.

> +filter_extsz()
> +{
> +    sed "s/$EXTSIZE/EXTSIZE/g"
> +}
> +
> +setup()
> +{
> +    _scratch_mkfs >> "$seqres.full"  2>&1
> +    _scratch_mount >> "$seqres.full" 2>&1
> +    BLKSZ=`_get_block_size $SCRATCH_MNT`
> +    EXTSIZE=$(( BLKSZ*2 ))

Might want to check that there isn't an extsize/cowextsize set on the
root directory due to mkfs options.

> +}
> +
> +read_file_extsize()
> +{
> +    $XFS_IO_PROG -c "extsize" $1 | _filter_scratch | filter_extsz
> +}
> +
> +check_extsz_and_xflag()
> +{
> +    local filename=$1
> +    read_file_extsize $filename
> +    _test_xfs_xflags_field $filename "e" && echo "e flag set" || echo "e flag unset"
> +}
> +
> +check_extsz_xflag_across_remount()
> +{
> +    local filename=$1
> +    _scratch_cycle_mount
> +    check_extsz_and_xflag $filename
> +}
> +
> +# Extsize flag should be cleared when extsize is reset, so this function
> +# checks that this behavior is followed.
> +reset_extsz_and_recheck_extsz_xflag()
> +{
> +    local filename=$1
> +    echo "Re-setting extsize hint to 0"
> +    $XFS_IO_PROG -c "extsize 0" $filename
> +    check_extsz_xflag_across_remount $filename
> +}
> +
> +check_extsz_xflag_before_and_after_reset()
> +{
> +    local filename=$1
> +    check_extsz_xflag_across_remount $filename
> +    reset_extsz_and_recheck_extsz_xflag $filename
> +}
> +
> +test_empty_file()
> +{
> +    echo "TEST: Set extsize on empty file"
> +    local filename=$1
> +    $XFS_IO_PROG \
> +        -c "open -f $filename" \
> +        -c "extsize $EXTSIZE" \
> +
> +    check_extsz_xflag_before_and_after_reset $filename
> +    echo
> +}
> +
> +test_data_delayed()
> +{
> +    echo "TEST: Set extsize on non-empty file with delayed allocation"
> +    local filename=$1
> +    $XFS_IO_PROG \
> +        -c "open -f $filename" \
> +        -c "pwrite -q  0 $FILE_DATA_SIZE" \
> +        -c "extsize $EXTSIZE" | _filter_scratch
> +
> +    check_extsz_xflag_across_remount $filename
> +    echo
> +}
> +
> +test_data_allocated()
> +{
> +    echo "TEST: Set extsize on non-empty file with allocated extents"
> +    local filename=$1
> +    $XFS_IO_PROG \
> +        -c "open -f $filename" \
> +        -c "pwrite -qW  0 $FILE_DATA_SIZE" \
> +        -c "extsize $EXTSIZE" | _filter_scratch
> +
> +    check_extsz_xflag_across_remount $filename
> +    echo
> +}
> +
> +test_truncate_allocated()
> +{
> +    echo "TEST: Set extsize after truncating a file with allocated extents"
> +    local filename=$1
> +    $XFS_IO_PROG \
> +        -c "open -f $filename" \
> +        -c "pwrite -qW  0 $FILE_DATA_SIZE" \
> +        -c "truncate 0" \
> +        -c "extsize $EXTSIZE" \
> +
> +    check_extsz_xflag_across_remount $filename
> +    echo
> +}
> +
> +test_truncate_delayed()
> +{
> +    echo "TEST: Set extsize after truncating a file with delayed allocation"
> +    local filename=$1
> +    $XFS_IO_PROG \
> +        -c "open -f $filename" \
> +        -c "pwrite -q  0 $FILE_DATA_SIZE" \
> +        -c "truncate 0" \
> +        -c "extsize $EXTSIZE" \
> +
> +    check_extsz_xflag_across_remount $filename
> +    echo
> +}

Does this work for filesystems that don't have delalloc?  Like fsdax
filesystems?

--D

> +setup
> +echo -e "EXTSIZE = $EXTSIZE BLOCKSIZE = $BLKSZ\n" >> "$seqres.full"
> +
> +NEW_FILE_NAME_PREFIX=$SCRATCH_MNT/new-file-
> +
> +test_empty_file "$NEW_FILE_NAME_PREFIX"00
> +test_data_delayed "$NEW_FILE_NAME_PREFIX"01
> +test_data_allocated "$NEW_FILE_NAME_PREFIX"02
> +test_truncate_allocated "$NEW_FILE_NAME_PREFIX"03
> +test_truncate_delayed "$NEW_FILE_NAME_PREFIX"04
> +
> +status=0
> +exit
> diff --git a/tests/generic/365.out b/tests/generic/365.out
> new file mode 100644
> index 00000000..38cd0885
> --- /dev/null
> +++ b/tests/generic/365.out
> @@ -0,0 +1,26 @@
> +QA output created by 365
> +TEST: Set extsize on empty file
> +[EXTSIZE] SCRATCH_MNT/new-file-00
> +e flag set
> +Re-setting extsize hint to 0
> +[0] SCRATCH_MNT/new-file-00
> +e flag unset
> +
> +TEST: Set extsize on non-empty file with delayed allocation
> +xfs_io: FS_IOC_FSSETXATTR SCRATCH_MNT/new-file-01: Invalid argument
> +[0] SCRATCH_MNT/new-file-01
> +e flag unset
> +
> +TEST: Set extsize on non-empty file with allocated extents
> +xfs_io: FS_IOC_FSSETXATTR SCRATCH_MNT/new-file-02: Invalid argument
> +[0] SCRATCH_MNT/new-file-02
> +e flag unset
> +
> +TEST: Set extsize after truncating a file with allocated extents
> +[EXTSIZE] SCRATCH_MNT/new-file-03
> +e flag set
> +
> +TEST: Set extsize after truncating a file with delayed allocation
> +[EXTSIZE] SCRATCH_MNT/new-file-04
> +e flag set
> +
> -- 
> 2.43.5
> 
>