* [PATCH] btrfs: test that we don't create pointless compressed inline extents
@ 2026-09-14 17:54 fdmanana
2026-09-15 11:44 ` David Disseldorp
2026-09-15 15:05 ` [PATCH v2] " fdmanana
0 siblings, 2 replies; 5+ messages in thread
From: fdmanana @ 2026-09-14 17:54 UTC (permalink / raw)
To: fstests; +Cc: linux-btrfs, Filipe Manana
From: Filipe Manana <fdmanana@suse.com>
Verify that we don't create compressed inline extents when the compressed
data size is not smaller than the uncompressed data size.
This exercises a regression introduced in kernel 7.1 and that is fixed by
the following patch:
"btrfs: fix creation of compressed inline extents that don't save space"
Signed-off-by: Filipe Manana <fdmanana@suse.com>
---
tests/btrfs/354 | 44 ++++++++++++++++++++++++++++++++++++++++++++
tests/btrfs/354.out | 2 ++
2 files changed, 46 insertions(+)
create mode 100755 tests/btrfs/354
create mode 100644 tests/btrfs/354.out
diff --git a/tests/btrfs/354 b/tests/btrfs/354
new file mode 100755
index 00000000..801dc587
--- /dev/null
+++ b/tests/btrfs/354
@@ -0,0 +1,44 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2026 SUSE S.A. All Rights Reserved.
+#
+# FS QA Test 354
+#
+# Verify that we don't create compressed inline extents when the compressed
+# data size is not smaller than the uncompressed data size.
+#
+. ./common/preamble
+_begin_fstest auto quick compress
+
+. ./common/filter
+
+_fixed_by_kernel_commit xxxxxxxxxxxx \
+ "btrfs: fix creation of compressed inline extents that don't save space"
+
+_require_scratch
+_require_btrfs_command inspect-internal dump-tree
+
+algo_list=($(_btrfs_compression_algos))
+for algo in ${algo_list[@]}; do
+ _scratch_mkfs >>$seqres.full 2>&1 || _fail "mkfs failed"
+ _scratch_mount "-o compress=$algo"
+
+ echo 'a file with test content' > $SCRATCH_MNT/foobar
+ _scratch_unmount
+ _check_scratch_fs
+
+ extent_size=$($BTRFS_UTIL_PROG inspect-internal dump-tree -t 5 $SCRATCH_DEV | \
+ grep 'inline extent' | \
+ $AWK_PROG '{ for (i = 1; i < NF; i++) if ($i ~ /^size$/) print $(i + 1) }')
+ ram_size=$($BTRFS_UTIL_PROG inspect-internal dump-tree -t 5 $SCRATCH_DEV | \
+ grep 'inline extent' | \
+ $AWK_PROG '{ for (i = 1; i < NF; i++) if ($i ~ /^ram_bytes$/) print $(i + 1) }')
+
+ if [ "$extent_size" -gt "$ram_size" ]; then
+ echo "inline extent size ($extent_size) greater than ram_size ($ram_size) for algo $algo"
+ fi
+done
+
+# success, all done
+echo "Silence is golden"
+_exit 0
diff --git a/tests/btrfs/354.out b/tests/btrfs/354.out
new file mode 100644
index 00000000..8bc7ecf6
--- /dev/null
+++ b/tests/btrfs/354.out
@@ -0,0 +1,2 @@
+QA output created by 354
+Silence is golden
--
2.47.2
^ permalink raw reply related [flat|nested] 5+ messages in thread* Re: [PATCH] btrfs: test that we don't create pointless compressed inline extents
2026-09-14 17:54 [PATCH] btrfs: test that we don't create pointless compressed inline extents fdmanana
@ 2026-09-15 11:44 ` David Disseldorp
2026-09-15 15:05 ` Filipe Manana
2026-09-15 15:05 ` [PATCH v2] " fdmanana
1 sibling, 1 reply; 5+ messages in thread
From: David Disseldorp @ 2026-09-15 11:44 UTC (permalink / raw)
To: fdmanana; +Cc: fstests, linux-btrfs, Filipe Manana
On Mon, 14 Sep 2026 18:54:23 +0100, fdmanana@kernel.org wrote:
> From: Filipe Manana <fdmanana@suse.com>
>
> Verify that we don't create compressed inline extents when the compressed
> data size is not smaller than the uncompressed data size.
>
> This exercises a regression introduced in kernel 7.1 and that is fixed by
> the following patch:
>
> "btrfs: fix creation of compressed inline extents that don't save space"
>
> Signed-off-by: Filipe Manana <fdmanana@suse.com>
Looks good and works for me:
Reviewed-by: David Disseldorp <ddiss@suse.de>
A couple of minor nits below...
> ---
> tests/btrfs/354 | 44 ++++++++++++++++++++++++++++++++++++++++++++
> tests/btrfs/354.out | 2 ++
> 2 files changed, 46 insertions(+)
> create mode 100755 tests/btrfs/354
> create mode 100644 tests/btrfs/354.out
>
> diff --git a/tests/btrfs/354 b/tests/btrfs/354
> new file mode 100755
> index 00000000..801dc587
> --- /dev/null
> +++ b/tests/btrfs/354
> @@ -0,0 +1,44 @@
> +#! /bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright (c) 2026 SUSE S.A. All Rights Reserved.
> +#
> +# FS QA Test 354
> +#
> +# Verify that we don't create compressed inline extents when the compressed
> +# data size is not smaller than the uncompressed data size.
> +#
> +. ./common/preamble
> +_begin_fstest auto quick compress
> +
> +. ./common/filter
> +
> +_fixed_by_kernel_commit xxxxxxxxxxxx \
> + "btrfs: fix creation of compressed inline extents that don't save space"
> +
> +_require_scratch
> +_require_btrfs_command inspect-internal dump-tree
> +
> +algo_list=($(_btrfs_compression_algos))
> +for algo in ${algo_list[@]}; do
> + _scratch_mkfs >>$seqres.full 2>&1 || _fail "mkfs failed"
> + _scratch_mount "-o compress=$algo"
> +
> + echo 'a file with test content' > $SCRATCH_MNT/foobar
> + _scratch_unmount
> + _check_scratch_fs
> +
> + extent_size=$($BTRFS_UTIL_PROG inspect-internal dump-tree -t 5 $SCRATCH_DEV | \
> + grep 'inline extent' | \
> + $AWK_PROG '{ for (i = 1; i < NF; i++) if ($i ~ /^size$/) print $(i + 1) }')
> + ram_size=$($BTRFS_UTIL_PROG inspect-internal dump-tree -t 5 $SCRATCH_DEV | \
> + grep 'inline extent' | \
> + $AWK_PROG '{ for (i = 1; i < NF; i++) if ($i ~ /^ram_bytes$/) print $(i + 1) }')
> +
> + if [ "$extent_size" -gt "$ram_size" ]; then
> + echo "inline extent size ($extent_size) greater than ram_size ($ram_size) for algo $algo"
> + fi
It might be a little nicer to avoid multiple dumps and do the check in
awk. The following works for me, feel free to squash in...
diff --git a/tests/btrfs/354 b/tests/btrfs/354
index 801dc587..e744b945 100755
--- a/tests/btrfs/354
+++ b/tests/btrfs/354
@@ -27,18 +27,20 @@ for algo in ${algo_list[@]}; do
_scratch_unmount
_check_scratch_fs
- extent_size=$($BTRFS_UTIL_PROG inspect-internal dump-tree -t 5 $SCRATCH_DEV | \
- grep 'inline extent' | \
- $AWK_PROG '{ for (i = 1; i < NF; i++) if ($i ~ /^size$/) print $(i + 1) }')
- ram_size=$($BTRFS_UTIL_PROG inspect-internal dump-tree -t 5 $SCRATCH_DEV | \
- grep 'inline extent' | \
- $AWK_PROG '{ for (i = 1; i < NF; i++) if ($i ~ /^ram_bytes$/) print $(i + 1) }')
-
- if [ "$extent_size" -gt "$ram_size" ]; then
- echo "inline extent size ($extent_size) greater than ram_size ($ram_size) for algo $algo"
- fi
+ $BTRFS_UTIL_PROG inspect-internal dump-tree -t 5 $SCRATCH_DEV | \
+ tee -a $seqres.full | \
+ $AWK_PROG -v algo="$algo" '
+ /inline extent/ {
+ for (i = 1; i < NF; i++) {
+ if ($i ~ /^size$/)
+ extent_size = $(i + 1)
+ if ($i ~ /^ram_bytes$/)
+ ram_size = $(i + 1)
+ }
+ if (extent_size > ram_size)
+ printf "inline extent size (%d) greater than ram_size (%d) for algo %s\n", extent_size, ram_size, algo
+ }'
> +done
> +
> +# success, all done
Delete the line above, as we get here on failure too.
> +echo "Silence is golden"
> +_exit 0
> diff --git a/tests/btrfs/354.out b/tests/btrfs/354.out
> new file mode 100644
> index 00000000..8bc7ecf6
> --- /dev/null
> +++ b/tests/btrfs/354.out
> @@ -0,0 +1,2 @@
> +QA output created by 354
> +Silence is golden
^ permalink raw reply related [flat|nested] 5+ messages in thread* Re: [PATCH] btrfs: test that we don't create pointless compressed inline extents
2026-09-15 11:44 ` David Disseldorp
@ 2026-09-15 15:05 ` Filipe Manana
0 siblings, 0 replies; 5+ messages in thread
From: Filipe Manana @ 2026-09-15 15:05 UTC (permalink / raw)
To: David Disseldorp; +Cc: fstests, linux-btrfs, Filipe Manana
On Tue, Sep 15, 2026 at 12:45 PM David Disseldorp <ddiss@suse.de> wrote:
>
> On Mon, 14 Sep 2026 18:54:23 +0100, fdmanana@kernel.org wrote:
>
> > From: Filipe Manana <fdmanana@suse.com>
> >
> > Verify that we don't create compressed inline extents when the compressed
> > data size is not smaller than the uncompressed data size.
> >
> > This exercises a regression introduced in kernel 7.1 and that is fixed by
> > the following patch:
> >
> > "btrfs: fix creation of compressed inline extents that don't save space"
> >
> > Signed-off-by: Filipe Manana <fdmanana@suse.com>
>
> Looks good and works for me:
> Reviewed-by: David Disseldorp <ddiss@suse.de>
>
> A couple of minor nits below...
>
> > ---
> > tests/btrfs/354 | 44 ++++++++++++++++++++++++++++++++++++++++++++
> > tests/btrfs/354.out | 2 ++
> > 2 files changed, 46 insertions(+)
> > create mode 100755 tests/btrfs/354
> > create mode 100644 tests/btrfs/354.out
> >
> > diff --git a/tests/btrfs/354 b/tests/btrfs/354
> > new file mode 100755
> > index 00000000..801dc587
> > --- /dev/null
> > +++ b/tests/btrfs/354
> > @@ -0,0 +1,44 @@
> > +#! /bin/bash
> > +# SPDX-License-Identifier: GPL-2.0
> > +# Copyright (c) 2026 SUSE S.A. All Rights Reserved.
> > +#
> > +# FS QA Test 354
> > +#
> > +# Verify that we don't create compressed inline extents when the compressed
> > +# data size is not smaller than the uncompressed data size.
> > +#
> > +. ./common/preamble
> > +_begin_fstest auto quick compress
> > +
> > +. ./common/filter
> > +
> > +_fixed_by_kernel_commit xxxxxxxxxxxx \
> > + "btrfs: fix creation of compressed inline extents that don't save space"
> > +
> > +_require_scratch
> > +_require_btrfs_command inspect-internal dump-tree
> > +
> > +algo_list=($(_btrfs_compression_algos))
> > +for algo in ${algo_list[@]}; do
> > + _scratch_mkfs >>$seqres.full 2>&1 || _fail "mkfs failed"
> > + _scratch_mount "-o compress=$algo"
> > +
> > + echo 'a file with test content' > $SCRATCH_MNT/foobar
> > + _scratch_unmount
> > + _check_scratch_fs
> > +
> > + extent_size=$($BTRFS_UTIL_PROG inspect-internal dump-tree -t 5 $SCRATCH_DEV | \
> > + grep 'inline extent' | \
> > + $AWK_PROG '{ for (i = 1; i < NF; i++) if ($i ~ /^size$/) print $(i + 1) }')
> > + ram_size=$($BTRFS_UTIL_PROG inspect-internal dump-tree -t 5 $SCRATCH_DEV | \
> > + grep 'inline extent' | \
> > + $AWK_PROG '{ for (i = 1; i < NF; i++) if ($i ~ /^ram_bytes$/) print $(i + 1) }')
> > +
> > + if [ "$extent_size" -gt "$ram_size" ]; then
> > + echo "inline extent size ($extent_size) greater than ram_size ($ram_size) for algo $algo"
> > + fi
>
> It might be a little nicer to avoid multiple dumps and do the check in
> awk. The following works for me, feel free to squash in...
Integrated in v2, thanks.
>
> diff --git a/tests/btrfs/354 b/tests/btrfs/354
> index 801dc587..e744b945 100755
> --- a/tests/btrfs/354
> +++ b/tests/btrfs/354
> @@ -27,18 +27,20 @@ for algo in ${algo_list[@]}; do
> _scratch_unmount
> _check_scratch_fs
>
> - extent_size=$($BTRFS_UTIL_PROG inspect-internal dump-tree -t 5 $SCRATCH_DEV | \
> - grep 'inline extent' | \
> - $AWK_PROG '{ for (i = 1; i < NF; i++) if ($i ~ /^size$/) print $(i + 1) }')
> - ram_size=$($BTRFS_UTIL_PROG inspect-internal dump-tree -t 5 $SCRATCH_DEV | \
> - grep 'inline extent' | \
> - $AWK_PROG '{ for (i = 1; i < NF; i++) if ($i ~ /^ram_bytes$/) print $(i + 1) }')
> -
> - if [ "$extent_size" -gt "$ram_size" ]; then
> - echo "inline extent size ($extent_size) greater than ram_size ($ram_size) for algo $algo"
> - fi
> + $BTRFS_UTIL_PROG inspect-internal dump-tree -t 5 $SCRATCH_DEV | \
> + tee -a $seqres.full | \
> + $AWK_PROG -v algo="$algo" '
> + /inline extent/ {
> + for (i = 1; i < NF; i++) {
> + if ($i ~ /^size$/)
> + extent_size = $(i + 1)
> + if ($i ~ /^ram_bytes$/)
> + ram_size = $(i + 1)
> + }
> + if (extent_size > ram_size)
> + printf "inline extent size (%d) greater than ram_size (%d) for algo %s\n", extent_size, ram_size, algo
> + }'
>
> > +done
> > +
> > +# success, all done
>
> Delete the line above, as we get here on failure too.
>
> > +echo "Silence is golden"
> > +_exit 0
> > diff --git a/tests/btrfs/354.out b/tests/btrfs/354.out
> > new file mode 100644
> > index 00000000..8bc7ecf6
> > --- /dev/null
> > +++ b/tests/btrfs/354.out
> > @@ -0,0 +1,2 @@
> > +QA output created by 354
> > +Silence is golden
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH v2] btrfs: test that we don't create pointless compressed inline extents
2026-09-14 17:54 [PATCH] btrfs: test that we don't create pointless compressed inline extents fdmanana
2026-09-15 11:44 ` David Disseldorp
@ 2026-09-15 15:05 ` fdmanana
2026-09-15 22:16 ` Qu Wenruo
1 sibling, 1 reply; 5+ messages in thread
From: fdmanana @ 2026-09-15 15:05 UTC (permalink / raw)
To: fstests; +Cc: linux-btrfs, Filipe Manana, David Disseldorp
From: Filipe Manana <fdmanana@suse.com>
Verify that we don't create compressed inline extents when the compressed
data size is not smaller than the uncompressed data size.
This exercises a regression introduced in kernel 7.1 and that is fixed by
the following patch:
"btrfs: fix creation of compressed inline extents that don't save space"
Reviewed-by: David Disseldorp <ddiss@suse.de>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
---
V2: Use a single call to btrfs inspect-internal and a single awk
call (David Disseldorp).
tests/btrfs/354 | 46 +++++++++++++++++++++++++++++++++++++++++++++
tests/btrfs/354.out | 2 ++
2 files changed, 48 insertions(+)
create mode 100755 tests/btrfs/354
create mode 100644 tests/btrfs/354.out
diff --git a/tests/btrfs/354 b/tests/btrfs/354
new file mode 100755
index 00000000..1b25ab5d
--- /dev/null
+++ b/tests/btrfs/354
@@ -0,0 +1,46 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2026 SUSE S.A. All Rights Reserved.
+#
+# FS QA Test 354
+#
+# Verify that we don't create compressed inline extents when the compressed
+# data size is not smaller than the uncompressed data size.
+#
+. ./common/preamble
+_begin_fstest auto quick compress
+
+. ./common/filter
+
+_fixed_by_kernel_commit xxxxxxxxxxxx \
+ "btrfs: fix creation of compressed inline extents that don't save space"
+
+_require_scratch
+_require_btrfs_command inspect-internal dump-tree
+
+algo_list=($(_btrfs_compression_algos))
+for algo in ${algo_list[@]}; do
+ _scratch_mkfs >>$seqres.full 2>&1 || _fail "mkfs failed"
+ _scratch_mount "-o compress=$algo"
+
+ echo 'a file with test content' > $SCRATCH_MNT/foobar
+ _scratch_unmount
+ _check_scratch_fs
+
+ $BTRFS_UTIL_PROG inspect-internal dump-tree -t 5 $SCRATCH_DEV | \
+ tee -a $seqres.full | \
+ $AWK_PROG -v algo="$algo" '
+ /inline extent/ {
+ for (i = 1; i < NF; i++) {
+ if ($i ~ /^size$/)
+ extent_size = $(i + 1)
+ if ($i ~ /^ram_bytes$/)
+ ram_size = $(i + 1)
+ }
+ if (extent_size > ram_size)
+ printf "inline extent size (%d) greater than ram_size (%d) for algo %s\n", extent_size, ram_size, algo
+ }'
+done
+
+echo "Silence is golden"
+_exit 0
diff --git a/tests/btrfs/354.out b/tests/btrfs/354.out
new file mode 100644
index 00000000..8bc7ecf6
--- /dev/null
+++ b/tests/btrfs/354.out
@@ -0,0 +1,2 @@
+QA output created by 354
+Silence is golden
--
2.47.2
^ permalink raw reply related [flat|nested] 5+ messages in thread* Re: [PATCH v2] btrfs: test that we don't create pointless compressed inline extents
2026-09-15 15:05 ` [PATCH v2] " fdmanana
@ 2026-09-15 22:16 ` Qu Wenruo
0 siblings, 0 replies; 5+ messages in thread
From: Qu Wenruo @ 2026-09-15 22:16 UTC (permalink / raw)
To: fdmanana, fstests; +Cc: linux-btrfs, Filipe Manana, David Disseldorp
在 2026/9/16 00:35, fdmanana@kernel.org 写道:
> From: Filipe Manana <fdmanana@suse.com>
>
> Verify that we don't create compressed inline extents when the compressed
> data size is not smaller than the uncompressed data size.
>
> This exercises a regression introduced in kernel 7.1 and that is fixed by
> the following patch:
>
> "btrfs: fix creation of compressed inline extents that don't save space"
>
> Reviewed-by: David Disseldorp <ddiss@suse.de>
> Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Thanks,
Qu
> ---
>
> V2: Use a single call to btrfs inspect-internal and a single awk
> call (David Disseldorp).
>
> tests/btrfs/354 | 46 +++++++++++++++++++++++++++++++++++++++++++++
> tests/btrfs/354.out | 2 ++
> 2 files changed, 48 insertions(+)
> create mode 100755 tests/btrfs/354
> create mode 100644 tests/btrfs/354.out
>
> diff --git a/tests/btrfs/354 b/tests/btrfs/354
> new file mode 100755
> index 00000000..1b25ab5d
> --- /dev/null
> +++ b/tests/btrfs/354
> @@ -0,0 +1,46 @@
> +#! /bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright (c) 2026 SUSE S.A. All Rights Reserved.
> +#
> +# FS QA Test 354
> +#
> +# Verify that we don't create compressed inline extents when the compressed
> +# data size is not smaller than the uncompressed data size.
> +#
> +. ./common/preamble
> +_begin_fstest auto quick compress
> +
> +. ./common/filter
> +
> +_fixed_by_kernel_commit xxxxxxxxxxxx \
> + "btrfs: fix creation of compressed inline extents that don't save space"
> +
> +_require_scratch
> +_require_btrfs_command inspect-internal dump-tree
> +
> +algo_list=($(_btrfs_compression_algos))
> +for algo in ${algo_list[@]}; do
> + _scratch_mkfs >>$seqres.full 2>&1 || _fail "mkfs failed"
> + _scratch_mount "-o compress=$algo"
> +
> + echo 'a file with test content' > $SCRATCH_MNT/foobar
> + _scratch_unmount
> + _check_scratch_fs
> +
> + $BTRFS_UTIL_PROG inspect-internal dump-tree -t 5 $SCRATCH_DEV | \
> + tee -a $seqres.full | \
> + $AWK_PROG -v algo="$algo" '
> + /inline extent/ {
> + for (i = 1; i < NF; i++) {
> + if ($i ~ /^size$/)
> + extent_size = $(i + 1)
> + if ($i ~ /^ram_bytes$/)
> + ram_size = $(i + 1)
> + }
> + if (extent_size > ram_size)
> + printf "inline extent size (%d) greater than ram_size (%d) for algo %s\n", extent_size, ram_size, algo
> + }'
> +done
> +
> +echo "Silence is golden"
> +_exit 0
> diff --git a/tests/btrfs/354.out b/tests/btrfs/354.out
> new file mode 100644
> index 00000000..8bc7ecf6
> --- /dev/null
> +++ b/tests/btrfs/354.out
> @@ -0,0 +1,2 @@
> +QA output created by 354
> +Silence is golden
^ permalink raw reply [flat|nested] 5+ messages in thread
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2026-09-14 17:54 [PATCH] btrfs: test that we don't create pointless compressed inline extents fdmanana
2026-09-15 11:44 ` David Disseldorp
2026-09-15 15:05 ` Filipe Manana
2026-09-15 15:05 ` [PATCH v2] " fdmanana
2026-09-15 22:16 ` Qu Wenruo
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