Test that COW writeback that overlaps non-shared delalloc blocks does not leave around stale delalloc blocks on I/O failure. This triggers assert failures and free space accounting corruption on XFS. Signed-off-by: Brian Foster <bfoster@xxxxxxxxxx> --- This test targets the problem addressed by the following patch in XFS: https://lore.kernel.org/linux-xfs/20211021163330.1886516-1-bfoster@xxxxxxxxxx/ Brian tests/generic/651 | 53 +++++++++++++++++++++++++++++++++++++++++++ tests/generic/651.out | 2 ++ 2 files changed, 55 insertions(+) create mode 100755 tests/generic/651 create mode 100644 tests/generic/651.out diff --git a/tests/generic/651 b/tests/generic/651 new file mode 100755 index 00000000..8d4e6728 --- /dev/null +++ b/tests/generic/651 @@ -0,0 +1,53 @@ +#! /bin/bash +# SPDX-License-Identifier: GPL-2.0 +# Copyright (c) 2021 Red Hat, Inc. All Rights Reserved. +# +# FS QA Test 651 +# +# Test that COW writeback that overlaps non-shared delalloc blocks does not +# leave around stale delalloc blocks on I/O failure. This triggers assert +# failures and free space accounting corruption on XFS. +# +. ./common/preamble +_begin_fstest auto quick clone + +_cleanup() +{ + _cleanup_flakey + cd / + rm -r -f $tmp.* +} + +# Import common functions. +. ./common/reflink +. ./common/dmflakey + +# real QA test starts here +_supported_fs generic +_require_scratch_reflink +_require_flakey_with_error_writes + +_scratch_mkfs >> $seqres.full +_init_flakey +_mount_flakey + +# create two files that share a single block +$XFS_IO_PROG -fc "pwrite 4k 4k" $SCRATCH_MNT/file1 >> $seqres.full +cp --reflink $SCRATCH_MNT/file1 $SCRATCH_MNT/file2 + +# Perform a buffered write across the shared and non-shared blocks. On XFS, this +# creates a COW fork extent that covers the shared block as well as the just +# created non-shared delalloc block. Fail the writeback to verify that all +# delayed allocation is cleaned up properly. +_load_flakey_table $FLAKEY_ERROR_WRITES +$XFS_IO_PROG -c "pwrite 0 8k" -c fsync $SCRATCH_MNT/file2 >> $seqres.full +_load_flakey_table $FLAKEY_ALLOW_WRITES + +# Try a post-fail reflink and then unmount. Both of these are known to produce +# errors and/or assert failures on XFS if we trip over a stale delalloc block. +cp --reflink $SCRATCH_MNT/file2 $SCRATCH_MNT/file3 +_unmount_flakey + +# success, all done +status=0 +exit diff --git a/tests/generic/651.out b/tests/generic/651.out new file mode 100644 index 00000000..bd44c80c --- /dev/null +++ b/tests/generic/651.out @@ -0,0 +1,2 @@ +QA output created by 651 +fsync: Input/output error -- 2.31.1
