Re: [PATCHv2 3/4] generic/676: Add a new shutdown recovery test

["Darrick J. Wong" <djwong@kernel.org>]

On Tue, Mar 15, 2022 at 07:58:58PM +0530, Ritesh Harjani wrote:
> In certain cases (it is noted with ext4 fast_commit feature) that, replay phase
> may not delete the right range of blocks (after sudden FS shutdown)
> due to some operations which depends on inode->i_size (which during replay of
> an inode with fast_commit could be 0 for sometime).
> This fstest is added to test for such scenarios for all generic fs.
> 
> This test case is based on the test case shared via Xin Yin.
> 
> Signed-off-by: Ritesh Harjani <riteshh@linux.ibm.com>
> ---
>  tests/generic/676     | 72 +++++++++++++++++++++++++++++++++++++++++++
>  tests/generic/676.out |  7 +++++
>  2 files changed, 79 insertions(+)
>  create mode 100755 tests/generic/676
>  create mode 100644 tests/generic/676.out
> 
> diff --git a/tests/generic/676 b/tests/generic/676
> new file mode 100755
> index 00000000..315edcdf
> --- /dev/null
> +++ b/tests/generic/676
> @@ -0,0 +1,72 @@
> +#! /bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright (c) 2022 IBM Corporation.  All Rights Reserved.
> +#
> +# FS QA Test 676
> +#
> +# This test with ext4 fast_commit feature w/o below patch missed to delete the right
> +# range during replay phase, since it depends upon inode->i_size (which might not be
> +# stable during replay phase, at least for ext4).
> +# 0b5b5a62b945a141: ext4: use ext4_ext_remove_space() for fast commit replay delete range
> +# (Based on test case shared by Xin Yin <yinxin.x@bytedance.com>)
> +#
> +
> +. ./common/preamble
> +_begin_fstest auto shutdown quick log recoveryloop

This isn't a looping recovery test.  Maybe we should create a 'recovery'
group for tests that only run once?  I think we already have a few
fstests like that.

> +
> +# Override the default cleanup function.
> +_cleanup()
> +{
> +	cd /
> +	rm -r -f $tmp.*
> +   _scratch_unmount > /dev/null 2>&1

I think the test harness does this for you already, right?

> +}
> +
> +# Import common functions.
> +. ./common/filter
> +. ./common/punch
> +
> +# real QA test starts here
> +
> +# Modify as appropriate.
> +_supported_fs generic
> +_require_scratch
> +_require_xfs_io_command "fpunch"
> +_require_xfs_io_command "fzero"
> +_require_xfs_io_command "fiemap"

_require_scratch_shutdown

> +
> +t1=$SCRATCH_MNT/foo
> +t2=$SCRATCH_MNT/bar
> +
> +_scratch_mkfs > $seqres.full 2>&1
> +
> +_scratch_mount >> $seqres.full 2>&1
> +
> +bs=$(_get_block_size $SCRATCH_MNT)

_get_file_block_size, in case the file allocation unit isn't the same as
the fs blocksize?  (e.g. bigalloc, xfs realtime, etc.)

--D

> +
> +# create and write data to t1
> +$XFS_IO_PROG -f -c "pwrite 0 $((100*$bs))" $t1 | _filter_xfs_io_numbers
> +
> +# fzero certain range in between with -k
> +$XFS_IO_PROG -c "fzero -k  $((40*$bs)) $((20*$bs))" $t1
> +
> +# create and fsync a new file t2
> +$XFS_IO_PROG -f -c "fsync" $t2
> +
> +# fpunch within the i_size of a file
> +$XFS_IO_PROG -c "fpunch $((30*$bs)) $((20*$bs))" $t1
> +
> +# fsync t1 to trigger journal operation
> +$XFS_IO_PROG -c "fsync" $t1
> +
> +# shutdown FS now for replay journal to kick in next mount
> +_scratch_shutdown -v >> $seqres.full 2>&1
> +
> +_scratch_cycle_mount
> +
> +# check fiemap reported is valid or not
> +$XFS_IO_PROG -c "fiemap -v" $t1 | _filter_fiemap_flags $bs
> +
> +# success, all done
> +status=0
> +exit
> diff --git a/tests/generic/676.out b/tests/generic/676.out
> new file mode 100644
> index 00000000..78375940
> --- /dev/null
> +++ b/tests/generic/676.out
> @@ -0,0 +1,7 @@
> +QA output created by 676
> +wrote XXXX/XXXX bytes at offset XXXX
> +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> +0: [0..29]: none
> +1: [30..49]: hole
> +2: [50..59]: unwritten
> +3: [60..99]: nonelast
> --
> 2.31.1
>