Re: [PATCH 07/12] btrfs: test snapshotting encrypted subvol

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On 31/10/2023 23:39, Filipe Manana wrote:

On Tue, Oct 10, 2023 at 9:26 PM Josef Bacik <josef@xxxxxxxxxxxxxx> wrote:


From: Sweet Tea Dorminy <sweettea-kernel@xxxxxxxxxx>

Make sure that snapshots of encrypted data are readable and writeable.

Test deliberately high-numbered to not conflict.

Signed-off-by: Sweet Tea Dorminy <sweettea-kernel@xxxxxxxxxx>
---
  tests/btrfs/614     |  76 ++++++++++++++++++++++++++++++
  tests/btrfs/614.out | 111 ++++++++++++++++++++++++++++++++++++++++++++
  2 files changed, 187 insertions(+)
  create mode 100755 tests/btrfs/614
  create mode 100644 tests/btrfs/614.out

diff --git a/tests/btrfs/614 b/tests/btrfs/614
new file mode 100755
index 00000000..87dd27f9
--- /dev/null
+++ b/tests/btrfs/614
@@ -0,0 +1,76 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2023 Meta Platforms, Inc.  All Rights Reserved.
+#
+# FS QA Test 614
+#
+# Try taking a snapshot of an encrypted subvolume. Make sure the snapshot is
+# still readable. Rewrite part of the subvol with the same data; make sure it's
+# still readable.
+#
+. ./common/preamble
+_begin_fstest auto encrypt


Should be in the 'snapshot' and 'subvol' groups too, as it creates a
snapshot and a subvolume.
Also maybe in the 'quick' group too, see the comments further below.


+
+# Import common functions.
+. ./common/encrypt
+. ./common/filter
+
+# real QA test starts here
+_supported_fs btrfs
+
+_require_test


The test device is not used, so this can go away.


+_require_scratch
+_require_scratch_encryption -v 2
+_require_command "$KEYCTL_PROG" keyctl
+
+_scratch_mkfs_encrypted &>> $seqres.full
+_scratch_mount
+
+udir=$SCRATCH_MNT/reference
+dir=$SCRATCH_MNT/subvol
+dir2=$SCRATCH_MNT/subvol2
+$BTRFS_UTIL_PROG subvolume create $dir >> $seqres.full
+mkdir $udir
+
+_set_encpolicy $dir $TEST_KEY_IDENTIFIER
+_add_enckey $SCRATCH_MNT "$TEST_RAW_KEY"
+
+# get files with lots of extents by using backwards writes.
+for j in `seq 0 50`; do
+       for i in `seq 20 -1 1`; do
+               $XFS_IO_PROG -f -d -c "pwrite $(($i * 4096)) 4096" \
+               $dir/foo-$j >> $seqres.full | _filter_xfs_io
+               $XFS_IO_PROG -f -d -c "pwrite $(($i * 4096)) 4096" \
+               $udir/foo-$j >> $seqres.full | _filter_xfs_io
+       done
+done
+
+$BTRFS_UTIL_PROG subvolume snapshot $dir $dir2 | _filter_scratch
+
+_scratch_remount
+_add_enckey $SCRATCH_MNT "$TEST_RAW_KEY"
+sleep 30


What's the sleep for?
Is the 30 seconds to wait for a transaction commit?
If it is then I'd rather mount the fs with -o commit=3 (or some other
low value) and then "sleep 3" to make the test run much faster.
A comment explaining why the sleep is there, what is its purpose,
should also be in place.


+echo "Diffing $dir and $dir2"
+diff $dir $dir2
+
+echo "Rewriting $dir2 partly"
+# rewrite half of each file in the snapshot
+for j in `seq 0 50`; do
+       for i in `seq 10 -1 1`; do
+               $XFS_IO_PROG -f -d -c "pwrite $(($i * 4096)) 4096" \
+               $dir2/foo-$j >> $seqres.full | _filter_xfs_io
+       done
+done
+
+echo "Diffing $dir and $dir2"
+diff $dir $dir2
+
+echo "Dropping key and diffing"
+_rm_enckey $SCRATCH_MNT $TEST_KEY_IDENTIFIER
+diff $dir $dir2 |& _filter_scratch | _filter_nokey_filenames
+
+$BTRFS_UTIL_PROG subvolume delete $dir > /dev/null 2>&1


What's the purpose of this subvolume delete?
It's ignoring stdout and stderr, so it doesn't care whether it
succeeds or fails, and we
don't do any tests/checks after it.

Thanks.
Josef, I'm planning to get this patchset ready for the PR. Are you planning to address the review comments as mentioned above? These 
aren't bugs, but they definitely add more clarity and adds to the
missing groups.


Thanks, Anand







+
+# success, all done
+status=0
+exit
diff --git a/tests/btrfs/614.out b/tests/btrfs/614.out
new file mode 100644
index 00000000..390807e8
--- /dev/null
+++ b/tests/btrfs/614.out
@@ -0,0 +1,111 @@
+QA output created by 614
+Added encryption key with identifier 69b2f6edeee720cce0577937eb8a6751
+Create a snapshot of 'SCRATCH_MNT/subvol' in 'SCRATCH_MNT/subvol2'
+Added encryption key with identifier 69b2f6edeee720cce0577937eb8a6751
+Diffing /mnt/scratch/subvol and /mnt/scratch/subvol2
+Rewriting /mnt/scratch/subvol2 partly
+Diffing /mnt/scratch/subvol and /mnt/scratch/subvol2
+Dropping key and diffing
+Removed encryption key with identifier 69b2f6edeee720cce0577937eb8a6751
+NOKEY_NAME: NOKEY_NAME/NOKEY_NAME/NOKEY_NAME: NOKEY_NAME NOKEY_NAME NOKEY_NAME NOKEY_NAME
+NOKEY_NAME: NOKEY_NAME/NOKEY_NAME/NOKEY_NAME: NOKEY_NAME NOKEY_NAME NOKEY_NAME NOKEY_NAME
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+NOKEY_NAME: NOKEY_NAME/NOKEY_NAME/NOKEY_NAME: NOKEY_NAME NOKEY_NAME NOKEY_NAME NOKEY_NAME
+NOKEY_NAME: NOKEY_NAME/NOKEY_NAME/NOKEY_NAME: NOKEY_NAME NOKEY_NAME NOKEY_NAME NOKEY_NAME
+NOKEY_NAME: NOKEY_NAME/NOKEY_NAME/NOKEY_NAME: NOKEY_NAME NOKEY_NAME NOKEY_NAME NOKEY_NAME
+NOKEY_NAME: NOKEY_NAME/NOKEY_NAME/NOKEY_NAME: NOKEY_NAME NOKEY_NAME NOKEY_NAME NOKEY_NAME
+NOKEY_NAME: NOKEY_NAME/NOKEY_NAME/NOKEY_NAME: NOKEY_NAME NOKEY_NAME NOKEY_NAME NOKEY_NAME
+NOKEY_NAME: NOKEY_NAME/NOKEY_NAME/NOKEY_NAME: NOKEY_NAME NOKEY_NAME NOKEY_NAME NOKEY_NAME
+NOKEY_NAME: NOKEY_NAME/NOKEY_NAME/NOKEY_NAME: NOKEY_NAME NOKEY_NAME NOKEY_NAME NOKEY_NAME
+NOKEY_NAME: NOKEY_NAME/NOKEY_NAME/NOKEY_NAME: NOKEY_NAME NOKEY_NAME NOKEY_NAME NOKEY_NAME
+NOKEY_NAME: NOKEY_NAME/NOKEY_NAME/NOKEY_NAME: NOKEY_NAME NOKEY_NAME NOKEY_NAME NOKEY_NAME
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+NOKEY_NAME: NOKEY_NAME/NOKEY_NAME/NOKEY_NAME: NOKEY_NAME NOKEY_NAME NOKEY_NAME NOKEY_NAME
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+NOKEY_NAME: NOKEY_NAME/NOKEY_NAME/NOKEY_NAME: NOKEY_NAME NOKEY_NAME NOKEY_NAME NOKEY_NAME
--
2.41.0
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