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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2015 Red Hat Inc. All Rights Reserved.
#
# FS QA Test No. 067
#
# Some random mount/umount corner case tests
#
# - mount at a nonexistent mount point
# - mount a free loop device
# - mount with a wrong fs type specified
# - umount an symlink to device which is not mounted
# - umount a path with too long name
# - lazy umount a symlink
#
. ./common/preamble
_begin_fstest auto quick mount
# Import common functions.
. ./common/filter
# real QA test starts here
# Modify as appropriate.
_supported_fs generic
_require_symlinks
_require_test
_require_scratch
_require_loop
_require_block_device $SCRATCH_DEV
_scratch_mkfs >>$seqres.full 2>&1
# kernel should not hang nor oops when mounting fs to nonexistent mount point
mount_nonexistent_mnt()
{
echo "# mount to nonexistent mount point" >>$seqres.full
rm -rf $TEST_DIR/nosuchdir
$MOUNT_PROG $SCRATCH_DEV $TEST_DIR/nosuchdir >>$seqres.full 2>&1
}
# fs driver should be able to handle mounting a free loop device gracefully
# xfs ever hung, "ec53d1d xfs: don't block on buffer read errors" fixed it
mount_free_loopdev()
{
echo "# mount a free loop device" >>$seqres.full
loopdev=`losetup -f`
$MOUNT_PROG -t $FSTYP $loopdev $SCRATCH_MNT >>$seqres.full 2>&1
}
# mount with wrong fs type specified.
# This should fail gracefully, no hang no oops are expected
mount_wrong_fstype()
{
local fs=ext4
if [ "$FSTYP" == "ext4" ]; then
fs=xfs
fi
echo "# mount with wrong fs type" >>$seqres.full
$MOUNT_PROG -t $fs $SCRATCH_DEV $SCRATCH_MNT >>$seqres.full 2>&1
}
# umount a symlink to device, which is not mounted.
# This should fail gracefully, no hang no oops are expected
umount_symlink_device()
{
local symlink=$TEST_DIR/$seq.scratch_dev_symlink
rm -f $symlink
echo "# umount symlink to device, which is not mounted" >>$seqres.full
ln -s $SCRATCH_DEV $symlink
$UMOUNT_PROG $symlink >>$seqres.full 2>&1
}
# umount a path name that is 256 bytes long, this should fail gracefully,
# and the following umount should not hang nor oops
umount_toolong_name()
{
local longname=$SCRATCH_MNT/`$PERL_PROG -e 'print "a"x256;'`
_scratch_mount 2>&1 | tee -a $seqres.full
echo "# umount a too-long name" >>$seqres.full
$UMOUNT_PROG $longname >>$seqres.full 2>&1
_scratch_unmount 2>&1 | tee -a $seqres.full
}
# lazy umount a symlink should not block following umount.
# This is the test case described in https://lkml.org/lkml/2014/7/21/98
lazy_umount_symlink()
{
local symlink=$SCRATCH_MNT/$seq.testdir_symlink
echo "# lazy umount a symlink" >>$seqres.full
_scratch_mount 2>&1 | tee -a $seqres.full
mkdir -p $SCRATCH_MNT/testdir
rm -f $symlink
ln -s $SCRATCH_MNT/testdir $symlink
$UMOUNT_PROG -l $symlink >>$seqres.full 2>&1
# _scratch_unmount should not be blocked
_scratch_unmount 2>&1 | tee -a $seqres.full
}
echo "Silence is golden"
mount_nonexistent_mnt
mount_free_loopdev
mount_wrong_fstype
umount_symlink_device
umount_toolong_name
lazy_umount_symlink
status=0
exit
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