Re: [PATCH 2/2] btrfs: test decompression in the middle of large extents

[Omar Sandoval]

On Fri, Feb 17, 2017 at 01:58:49PM +0800, Eryu Guan wrote:
> On Thu, Feb 16, 2017 at 06:32:49PM -0800, Omar Sandoval wrote:
> > From: Omar Sandoval 
> > 
> > This is a regression test for "Btrfs: fix btrfs_decompress_buf2page()".
> > It fails for zlib on v4.10-rc[1-7].
> > 
> > Signed-off-by: Omar Sandoval 
> > ---
> > This runs in <60 seconds on my test VM, which I think qualifies for the
> > quick group?
> 
> quick test usually takes <30s, so probably it's not quick enough :)
> (it takes ~80s on my test vm, which has 4vcpus and 8G memory)

Ok, I'll remove it from the quick group :)

> > 
> >  common/btrfs|  8 +
> >  tests/btrfs/137 | 96 
> > +
> >  tests/btrfs/137.out |  2 ++
> >  tests/btrfs/group   |  1 +
> >  4 files changed, 107 insertions(+)
> >  create mode 100755 tests/btrfs/137
> >  create mode 100644 tests/btrfs/137.out
> > 
> > diff --git a/common/btrfs b/common/btrfs
> > index 96c3635b..015ce4d2 100644
> > --- a/common/btrfs
> > +++ b/common/btrfs
> > @@ -364,3 +364,11 @@ _reload_btrfs_ko()
> > modprobe -r btrfs || _fail "btrfs unload failed"
> > modprobe btrfs || _fail "btrfs load failed"
> >  }
> > +
> > +_btrfs_compression_algos()
> > +{
> > +   echo zlib
> > +   if [ -e /sys/fs/btrfs/features/compress_lzo ]; then
> > +   echo lzo
> 
> If new compression algorithms are added, are there going to be new
> features/compress_$algo entry added? If so I'd suggest that take a more
> generic way to query supported compression algos, rather than
> "hard-coded" zlib and lzo.

I think that's safe to assume. I'll adapt this.

> > +   fi
> > +}
> > diff --git a/tests/btrfs/137 b/tests/btrfs/137
> > new file mode 100755
> > index ..c3f28cc0
> > --- /dev/null
> > +++ b/tests/btrfs/137
> > @@ -0,0 +1,96 @@
> > +#! /bin/bash
> > +# FS QA Test 137
> > +#
> > +# Test decompression in the middle of large extents. Regression test for 
> > Linux
> > +# kernel commit 6e78b3f7a193 ("Btrfs: fix btrfs_decompress_buf2page()").
> > +#
> > +#---
> > +# Copyright (c) 2017 Facebook.  All Rights Reserved.
> > +#
> > +# This program is free software; you can redistribute it and/or
> > +# modify it under the terms of the GNU General Public License as
> > +# published by the Free Software Foundation.
> > +#
> > +# This program is distributed in the hope that it would be useful,
> > +# but WITHOUT ANY WARRANTY; without even the implied warranty of
> > +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > +# GNU General Public License for more details.
> > +#
> > +# You should have received a copy of the GNU General Public License
> > +# along with this program; if not, write the Free Software Foundation,
> > +# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
> > +#---
> > +#
> > +
> > +seq=`basename $0`
> > +seqres=$RESULT_DIR/$seq
> > +echo "QA output created by $seq"
> > +
> > +here=`pwd`
> > +tmp=/tmp/$$
> > +status=1   # failure is the default!
> > +trap "_cleanup; exit \$status" 0 1 2 3 15
> > +
> > +_cleanup()
> > +{
> > +   cd /
> > +   rm -f $tmp.*
> > +}
> > +
> > +# get standard environment, filters and checks
> > +. ./common/rc
> > +. ./common/filter
> > +
> > +# remove previous $seqres.full before test
> > +rm -f $seqres.full
> > +
> > +# real QA test starts here
> > +
> > +_supported_fs btrfs
> > +_supported_os Linux
> > +_require_scratch
> 
> Better to have
> 
> _require_btrfs_command "property"
> 
> Not a big deal, but nice to have :)

Will fix. Thanks for the review.
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Re: [PATCH 2/2] btrfs: test decompression in the middle of large extents

[Eryu Guan]

On Thu, Feb 16, 2017 at 06:32:49PM -0800, Omar Sandoval wrote:
> From: Omar Sandoval 
> 
> This is a regression test for "Btrfs: fix btrfs_decompress_buf2page()".
> It fails for zlib on v4.10-rc[1-7].
> 
> Signed-off-by: Omar Sandoval 
> ---
> This runs in <60 seconds on my test VM, which I think qualifies for the
> quick group?

quick test usually takes <30s, so probably it's not quick enough :)
(it takes ~80s on my test vm, which has 4vcpus and 8G memory)

> 
>  common/btrfs|  8 +
>  tests/btrfs/137 | 96 
> +
>  tests/btrfs/137.out |  2 ++
>  tests/btrfs/group   |  1 +
>  4 files changed, 107 insertions(+)
>  create mode 100755 tests/btrfs/137
>  create mode 100644 tests/btrfs/137.out
> 
> diff --git a/common/btrfs b/common/btrfs
> index 96c3635b..015ce4d2 100644
> --- a/common/btrfs
> +++ b/common/btrfs
> @@ -364,3 +364,11 @@ _reload_btrfs_ko()
>   modprobe -r btrfs || _fail "btrfs unload failed"
>   modprobe btrfs || _fail "btrfs load failed"
>  }
> +
> +_btrfs_compression_algos()
> +{
> + echo zlib
> + if [ -e /sys/fs/btrfs/features/compress_lzo ]; then
> + echo lzo

If new compression algorithms are added, are there going to be new
features/compress_$algo entry added? If so I'd suggest that take a more
generic way to query supported compression algos, rather than
"hard-coded" zlib and lzo.

> + fi
> +}
> diff --git a/tests/btrfs/137 b/tests/btrfs/137
> new file mode 100755
> index ..c3f28cc0
> --- /dev/null
> +++ b/tests/btrfs/137
> @@ -0,0 +1,96 @@
> +#! /bin/bash
> +# FS QA Test 137
> +#
> +# Test decompression in the middle of large extents. Regression test for 
> Linux
> +# kernel commit 6e78b3f7a193 ("Btrfs: fix btrfs_decompress_buf2page()").
> +#
> +#---
> +# Copyright (c) 2017 Facebook.  All Rights Reserved.
> +#
> +# This program is free software; you can redistribute it and/or
> +# modify it under the terms of the GNU General Public License as
> +# published by the Free Software Foundation.
> +#
> +# This program is distributed in the hope that it would be useful,
> +# but WITHOUT ANY WARRANTY; without even the implied warranty of
> +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> +# GNU General Public License for more details.
> +#
> +# You should have received a copy of the GNU General Public License
> +# along with this program; if not, write the Free Software Foundation,
> +# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
> +#---
> +#
> +
> +seq=`basename $0`
> +seqres=$RESULT_DIR/$seq
> +echo "QA output created by $seq"
> +
> +here=`pwd`
> +tmp=/tmp/$$
> +status=1 # failure is the default!
> +trap "_cleanup; exit \$status" 0 1 2 3 15
> +
> +_cleanup()
> +{
> + cd /
> + rm -f $tmp.*
> +}
> +
> +# get standard environment, filters and checks
> +. ./common/rc
> +. ./common/filter
> +
> +# remove previous $seqres.full before test
> +rm -f $seqres.full
> +
> +# real QA test starts here
> +
> +_supported_fs btrfs
> +_supported_os Linux
> +_require_scratch

Better to have

_require_btrfs_command "property"

Not a big deal, but nice to have :)

Thanks,
Eryu

> +
> +algos=($(_btrfs_compression_algos))
> +
> +_scratch_mkfs >>$seqres.full 2>&1
> +_scratch_mount
> +# Need 1GB for the uncompressed file plus <1GB for each compressed file.
> +_require_fs_space $SCRATCH_MNT $((1024 * 1024 * (1 + ${#algos[@]})))
> +
> +# Checksum a piece in the middle of the file. This hits the unaligned case 
> that
> +# caused the original bug.
> +do_csum()
> +{
> + dd if="$1" bs=4K skip=555 count=100 2>>$seqres.full| md5sum | cut -d ' 
> ' -f 1
> +}
> +
> +# Create a large, uncompressed (but compressible) file.
> +touch "${SCRATCH_MNT}/uncompressed"
> +$BTRFS_UTIL_PROG property set "${SCRATCH_MNT}/uncompressed" compression ""
> +_ddt of="${SCRATCH_MNT}/uncompressed" bs=1M count=1K 2>&1 | _filter_dd
> +
> +csum="$(do_csum "${SCRATCH_MNT}/uncompressed")"
> +
> +for algo in ${algos[@]}; do
> + echo "Testing ${algo}" >> $seqres.full
> +
> + # Copy the same data, but with compression enabled.
> + touch "${SCRATCH_MNT}/${algo}"
> + $BTRFS_UTIL_PROG property set "${SCRATCH_MNT}/${algo}" compression 
> "${algo}"
> + dd if="${SCRATCH_MNT}/uncompressed" of="${SCRATCH_MNT}/${algo}" bs=1M 
> 2>&1 | _filter_dd
> +
> + # The correct data is likely still cached. Cycle the mount to drop the
> + # cache and start fresh.
> + _scratch_cycle_mount
> +
> + # Check the checksum.
> + compressed_csum="$(do_csum "${SCRATCH_MNT}/${algo}")"
> + if [ "${compressed_csum}" != "${csum}" ]; then
> + echo "Checksum mismatch for ${algo} (expected ${csum}, got 
> ${compressed_csum})"
> + fi
> +done
> +
> +echo "Silence is golden"
> +
> +status=0
> +exit
> diff --git 

[PATCH 2/2] btrfs: test decompression in the middle of large extents

[Omar Sandoval]

From: Omar Sandoval 

This is a regression test for "Btrfs: fix btrfs_decompress_buf2page()".
It fails for zlib on v4.10-rc[1-7].

Signed-off-by: Omar Sandoval 
---
This runs in <60 seconds on my test VM, which I think qualifies for the
quick group?

 common/btrfs|  8 +
 tests/btrfs/137 | 96 +
 tests/btrfs/137.out |  2 ++
 tests/btrfs/group   |  1 +
 4 files changed, 107 insertions(+)
 create mode 100755 tests/btrfs/137
 create mode 100644 tests/btrfs/137.out

diff --git a/common/btrfs b/common/btrfs
index 96c3635b..015ce4d2 100644
--- a/common/btrfs
+++ b/common/btrfs
@@ -364,3 +364,11 @@ _reload_btrfs_ko()
modprobe -r btrfs || _fail "btrfs unload failed"
modprobe btrfs || _fail "btrfs load failed"
 }
+
+_btrfs_compression_algos()
+{
+   echo zlib
+   if [ -e /sys/fs/btrfs/features/compress_lzo ]; then
+   echo lzo
+   fi
+}
diff --git a/tests/btrfs/137 b/tests/btrfs/137
new file mode 100755
index ..c3f28cc0
--- /dev/null
+++ b/tests/btrfs/137
@@ -0,0 +1,96 @@
+#! /bin/bash
+# FS QA Test 137
+#
+# Test decompression in the middle of large extents. Regression test for Linux
+# kernel commit 6e78b3f7a193 ("Btrfs: fix btrfs_decompress_buf2page()").
+#
+#---
+# Copyright (c) 2017 Facebook.  All Rights Reserved.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it would be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write the Free Software Foundation,
+# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#---
+#
+
+seq=`basename $0`
+seqres=$RESULT_DIR/$seq
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1   # failure is the default!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+_cleanup()
+{
+   cd /
+   rm -f $tmp.*
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# remove previous $seqres.full before test
+rm -f $seqres.full
+
+# real QA test starts here
+
+_supported_fs btrfs
+_supported_os Linux
+_require_scratch
+
+algos=($(_btrfs_compression_algos))
+
+_scratch_mkfs >>$seqres.full 2>&1
+_scratch_mount
+# Need 1GB for the uncompressed file plus <1GB for each compressed file.
+_require_fs_space $SCRATCH_MNT $((1024 * 1024 * (1 + ${#algos[@]})))
+
+# Checksum a piece in the middle of the file. This hits the unaligned case that
+# caused the original bug.
+do_csum()
+{
+   dd if="$1" bs=4K skip=555 count=100 2>>$seqres.full| md5sum | cut -d ' 
' -f 1
+}
+
+# Create a large, uncompressed (but compressible) file.
+touch "${SCRATCH_MNT}/uncompressed"
+$BTRFS_UTIL_PROG property set "${SCRATCH_MNT}/uncompressed" compression ""
+_ddt of="${SCRATCH_MNT}/uncompressed" bs=1M count=1K 2>&1 | _filter_dd
+
+csum="$(do_csum "${SCRATCH_MNT}/uncompressed")"
+
+for algo in ${algos[@]}; do
+   echo "Testing ${algo}" >> $seqres.full
+
+   # Copy the same data, but with compression enabled.
+   touch "${SCRATCH_MNT}/${algo}"
+   $BTRFS_UTIL_PROG property set "${SCRATCH_MNT}/${algo}" compression 
"${algo}"
+   dd if="${SCRATCH_MNT}/uncompressed" of="${SCRATCH_MNT}/${algo}" bs=1M 
2>&1 | _filter_dd
+
+   # The correct data is likely still cached. Cycle the mount to drop the
+   # cache and start fresh.
+   _scratch_cycle_mount
+
+   # Check the checksum.
+   compressed_csum="$(do_csum "${SCRATCH_MNT}/${algo}")"
+   if [ "${compressed_csum}" != "${csum}" ]; then
+   echo "Checksum mismatch for ${algo} (expected ${csum}, got 
${compressed_csum})"
+   fi
+done
+
+echo "Silence is golden"
+
+status=0
+exit
diff --git a/tests/btrfs/137.out b/tests/btrfs/137.out
new file mode 100644
index ..eb48dd21
--- /dev/null
+++ b/tests/btrfs/137.out
@@ -0,0 +1,2 @@
+QA output created by 137
+Silence is golden
diff --git a/tests/btrfs/group b/tests/btrfs/group
index ea88ba4e..0a119e4b 100644
--- a/tests/btrfs/group
+++ b/tests/btrfs/group
@@ -139,3 +139,4 @@
 134 auto quick send
 135 auto quick send
 136 auto convert
+137 auto quick compress
-- 
2.11.1

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