On Wed, Aug 25, 2021 at 7:19 AM Qu Wenruo <wqu@xxxxxxxx> wrote:
>
> Btrfs has the ability to inline small file extents into its metadata,
> and such inlined extents can be further compressed if needed.
>
> The new test case is for a regression caused by commit f2165627319f
> ("btrfs: compression: don't try to compress if we don't have enough
> pages").
>
> That commit prevents btrfs from creating compressed inline extents, even
> "-o compress,max_inline=2048" is specified, only uncompressed inline
> extents can be created.
>
> The test case will use "btrfs inspect dump-tree" to verify the created
> extent is both inlined and compressed.
>
> Signed-off-by: Qu Wenruo <wqu@xxxxxxxx>
> ---
> tests/btrfs/246 | 50 +++++++++++++++++++++++++++++++++++++++++++++
> tests/btrfs/246.out | 2 ++
> 2 files changed, 52 insertions(+)
> create mode 100755 tests/btrfs/246
> create mode 100644 tests/btrfs/246.out
>
> diff --git a/tests/btrfs/246 b/tests/btrfs/246
> new file mode 100755
> index 00000000..15bb064d
> --- /dev/null
> +++ b/tests/btrfs/246
> @@ -0,0 +1,50 @@
> +#! /bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright (c) 2021 SUSE Linux Products GmbH. All Rights Reserved.
> +#
> +# FS QA Test 246
> +#
> +# Make sure btrfs can create compressed inline extents
> +#
> +. ./common/preamble
> +_begin_fstest auto quick compress
> +
> +# Override the default cleanup function.
> +_cleanup()
> +{
> + cd /
> + rm -r -f $tmp.*
> +}
> +
> +# Import common functions.
> +. ./common/filter
> +# For __populate_find_inode()
> +. ./common/populate
> +
> +# real QA test starts here
> +
> +# Modify as appropriate.
> +_supported_fs btrfs
> +_require_scratch
> +
> +_scratch_mkfs > /dev/null
> +_scratch_mount -o compress,max_inline=2048
> +
> +# This should create compressed inline extent
> +$XFS_IO_PROG -f -c "pwrite 0 2048" $SCRATCH_MNT/foobar > /dev/null
> +ino=$(__populate_find_inode $SCRATCH_MNT/foobar)
> +_scratch_unmount
> +
> +$BTRFS_UTIL_PROG inspect dump-tree -t 5 $SCRATCH_DEV | \
> + grep "($ino EXTENT_DATA 0" -A2 > $tmp.dump-tree
> +echo "dump tree result for ino $ino:" >> $seqres.full
> +cat $tmp.dump-tree >> $seqres.full
> +
> +grep -q "inline extent" $tmp.dump-tree || echo "no inline extent found"
> +grep -q "compression 1" $tmp.dump-tree || echo "no compressed extent found"
> +
> +echo "Silence is golden"
While here, we could also check that we are able to read exactly what
we wrote before, after evicting the page (e.g. after a call to
_scratch_cycle_mount).
Other than that, it looks ok.
Thanks.
> +
> +# success, all done
> +status=0
> +exit
> diff --git a/tests/btrfs/246.out b/tests/btrfs/246.out
> new file mode 100644
> index 00000000..287f7983
> --- /dev/null
> +++ b/tests/btrfs/246.out
> @@ -0,0 +1,2 @@
> +QA output created by 246
> +Silence is golden
> --
> 2.31.1
>
--
Filipe David Manana,
“Whether you think you can, or you think you can't — you're right.”
