| #! /bin/bash |
| # SPDX-License-Identifier: GPL-2.0 |
| # Copyright (C) 2015 SUSE Linux Products GmbH. All Rights Reserved. |
| # |
| # FS QA Test No. btrfs/086 |
| # |
| # Test cloning a file range with a length of zero into a destination offset |
| # greater than zero. |
| # |
| # This made btrfs create an extent state record with a start offset greater than |
| # the end offset, resulting in chaos such as an infinite loop when evicting an |
| # inode. |
| # |
| # This issue was fixed by the following linux kernel patch: |
| # |
| # Btrfs: fix inode eviction infinite loop after cloning into it |
| # |
| . ./common/preamble |
| _begin_fstest auto quick clone |
| |
| # Import common functions. |
| . ./common/filter |
| |
| # real QA test starts here |
| _supported_fs btrfs |
| _require_scratch |
| _require_cloner |
| |
| _scratch_mkfs >>$seqres.full 2>&1 |
| _scratch_mount |
| |
| touch $SCRATCH_MNT/foo |
| touch $SCRATCH_MNT/bar |
| |
| # Now attempt to clone foo into bar. Because we pass a length of zero, the |
| # clone ioctl will adjust the length to match the size of the file foo (minus |
| # the source offset which is zero) - because the adjusted length value is |
| # zero, it made btrfs create an extent state record for file bar with a start |
| # offset (64k) greater then its end offset (64k - 1), which is something never |
| # supposed to happen and for example it made inode eviction enter an infinite |
| # loop that dumped a warning trace on each iteration. |
| $CLONER_PROG -s 0 -d 65536 -l 0 $SCRATCH_MNT/foo $SCRATCH_MNT/bar |
| echo "bar file size after clone operation: `_get_filesize $SCRATCH_MNT/bar`" |
| |
| status=0 |
| exit |
