tests/ext4/024

#! /bin/bash
# FS QA Test ext4/024
#
# Regression test for 0d06863f903a ("ext4: don't BUG when truncating encrypted
# inodes on the orphan list").
#
#-----------------------------------------------------------------------
# Copyright (c) 2017 Google, Inc.  All Rights Reserved.
#
# Author: Eric Biggers <ebiggers@google.com>
#
# 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 and checks
. ./common/rc
. ./common/encrypt

# remove previous $seqres.full before test
rm -f $seqres.full

# real QA test starts here
_supported_fs ext4
_supported_os Linux
_require_scratch_encryption
_require_xfs_io_command "set_encpolicy"
_require_command "$KEYCTL_PROG" keyctl

_new_session_keyring

#
# Create an encrypted file whose size is not a multiple of the filesystem block
# size, then add it to the orphan list.
#
# We create the encrypted file normally, rather than use debugfs to force the
# inode flags to ENCRYPT|EXTENTS as done in the example listed in the commit
# message of the kernel fix, because forcing the inode flags is incompatible
# with some MKFS_OPTIONS such as inline_data or ^extents.
#
# This choice does, however, have the disadvantage that this test won't detect
# the bug in as many situations, such as in kernels configured without
# encryption support.
#
_scratch_mkfs_encrypted &>>$seqres.full
_scratch_mount
mkdir $SCRATCH_MNT/edir
keydesc=$(_generate_encryption_key)
$XFS_IO_PROG -c "set_encpolicy $keydesc" $SCRATCH_MNT/edir
echo foo > $SCRATCH_MNT/edir/file
inum=$(stat -c '%i' $SCRATCH_MNT/edir/file)
_scratch_unmount
debugfs -w -R "set_super_value s_last_orphan $inum" $SCRATCH_DEV &>>$seqres.full

# Try to mount the filesystem.  This would hit a BUG() in fs/ext4/inode.c.
_try_scratch_mount

# success, all done
echo "Didn't crash!"
status=0
exit