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Message-ID: <0556e82c-600d-4324-8cf0-6d11613d57cc@gmail.com>
Date: Thu, 18 Dec 2025 01:02:51 +0800
From: Anand Jain <anajain.sg@...il.com>
To: Christoph Hellwig <hch@....de>, Zorro Lang <zlang@...nel.org>
Cc: Anand Jain <asj@...nel.org>, Filipe Manana <fdmanana@...e.com>,
"Darrick J. Wong" <djwong@...nel.org>, fstests@...r.kernel.org,
linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org
Subject: Re: [PATCH 05/13] generic/590: split XFS RT specific bits out
Looks good
Reviewed-by: Anand Jain <asj@...nel.org>
Thanks
On 12/12/25 16:21, Christoph Hellwig wrote:
> Currently generic/590 runs a very different test on XFS that creates
> a lot device and so on. Split that out into a new XFS-specific test,
> and let generic/590 always run using the file system parameter specified
> in the config even for XFS.
>
> Signed-off-by: Christoph Hellwig <hch@....de>
> Reviewed-by: "Darrick J. Wong" <djwong@...nel.org>
> ---
> tests/generic/590 | 68 ++-------------------------
> tests/xfs/650 | 117 ++++++++++++++++++++++++++++++++++++++++++++++
> tests/xfs/650.out | 2 +
> 3 files changed, 123 insertions(+), 64 deletions(-)
> create mode 100755 tests/xfs/650
> create mode 100644 tests/xfs/650.out
>
> diff --git a/tests/generic/590 b/tests/generic/590
> index ba1337a856f1..54c26f2ae5ed 100755
> --- a/tests/generic/590
> +++ b/tests/generic/590
> @@ -4,27 +4,15 @@
> #
> # FS QA Test 590
> #
> -# Test commit 0c4da70c83d4 ("xfs: fix realtime file data space leak") and
> -# 69ffe5960df1 ("xfs: don't check for AG deadlock for realtime files in
> -# bunmapi"). On XFS without the fixes, truncate will hang forever. On other
> -# filesystems, this just tests writing into big fallocates.
> +# Tests writing into big fallocates.
> +#
> +# Based on an XFS RT subvolume specific test now split into xfs/650.
> #
> . ./common/preamble
> _begin_fstest auto prealloc preallocrw
>
> -# Override the default cleanup function.
> -_cleanup()
> -{
> - _scratch_unmount &>/dev/null
> - [ -n "$loop_dev" ] && _destroy_loop_device $loop_dev
> - cd /
> - rm -f $tmp.*
> - rm -f "$TEST_DIR/$seq"
> -}
> -
> . ./common/filter
>
> -_require_scratch_nocheck
> _require_xfs_io_command "falloc"
>
> maxextlen=$((0x1fffff))
> @@ -32,54 +20,7 @@ bs=4096
> rextsize=4
> filesz=$(((maxextlen + 1) * bs))
>
> -must_disable_feature() {
> - local feat="$1"
> -
> - # If mkfs doesn't know about the feature, we don't need to disable it
> - $MKFS_XFS_PROG --help 2>&1 | grep -q "${feat}=0" || return 1
> -
> - # If turning the feature on works, we don't need to disable it
> - _scratch_mkfs_xfs_supported -m "${feat}=1" "${disabled_features[@]}" \
> - > /dev/null 2>&1 && return 1
> -
> - # Otherwise mkfs knows of the feature and formatting with it failed,
> - # so we do need to mask it.
> - return 0
> -}
> -
> -extra_options=""
> -# If we're testing XFS, set up the realtime device to reproduce the bug.
> -if [[ $FSTYP = xfs ]]; then
> - # If we don't have a realtime device, set up a loop device on the test
> - # filesystem.
> - if [[ $USE_EXTERNAL != yes || -z $SCRATCH_RTDEV ]]; then
> - _require_test
> - loopsz="$((filesz + (1 << 26)))"
> - _require_fs_space "$TEST_DIR" $((loopsz / 1024))
> - $XFS_IO_PROG -c "truncate $loopsz" -f "$TEST_DIR/$seq"
> - loop_dev="$(_create_loop_device "$TEST_DIR/$seq")"
> - USE_EXTERNAL=yes
> - SCRATCH_RTDEV="$loop_dev"
> - disabled_features=()
> -
> - # disable reflink if not supported by realtime devices
> - must_disable_feature reflink &&
> - disabled_features=(-m reflink=0)
> -
> - # disable rmap if not supported by realtime devices
> - must_disable_feature rmapbt &&
> - disabled_features+=(-m rmapbt=0)
> - fi
> - extra_options="$extra_options -r extsize=$((bs * rextsize))"
> - extra_options="$extra_options -d agsize=$(((maxextlen + 1) * bs / 2)),rtinherit=1"
> -
> - _scratch_mkfs $extra_options "${disabled_features[@]}" >>$seqres.full 2>&1
> - _try_scratch_mount >>$seqres.full 2>&1 || \
> - _notrun "mount failed, kernel doesn't support realtime?"
> - _scratch_unmount
> -else
> - _scratch_mkfs $extra_options >>$seqres.full 2>&1
> -fi
> +_scratch_mkfs >>$seqres.full 2>&1
> _scratch_mount
> _require_fs_space "$SCRATCH_MNT" $((filesz / 1024))
>
> @@ -112,7 +53,6 @@ $XFS_IO_PROG -c "pwrite -b 1M -W 0 $(((maxextlen + 2 - rextsize) * bs))" \
> # Truncate the extents.
> $XFS_IO_PROG -c "truncate 0" -c fsync "$SCRATCH_MNT/file"
>
> -# We need to do this before the loop device gets torn down.
> _scratch_unmount
> _check_scratch_fs
>
> diff --git a/tests/xfs/650 b/tests/xfs/650
> new file mode 100755
> index 000000000000..d8f70539665f
> --- /dev/null
> +++ b/tests/xfs/650
> @@ -0,0 +1,117 @@
> +#! /bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright (c) 2019 Facebook. All Rights Reserved.
> +#
> +# FS QA Test 650
> +#
> +# Test commit 0c4da70c83d4 ("xfs: fix realtime file data space leak") and
> +# 69ffe5960df1 ("xfs: don't check for AG deadlock for realtime files in
> +# bunmapi"). On XFS without the fixes, truncate will hang forever.
> +#
> +. ./common/preamble
> +_begin_fstest auto prealloc preallocrw
> +
> +# Override the default cleanup function.
> +_cleanup()
> +{
> + _scratch_unmount &>/dev/null
> + [ -n "$loop_dev" ] && _destroy_loop_device $loop_dev
> + cd /
> + rm -f $tmp.*
> + rm -f "$TEST_DIR/$seq"
> +}
> +
> +. ./common/filter
> +
> +_require_scratch_nocheck
> +_require_xfs_io_command "falloc"
> +
> +maxextlen=$((0x1fffff))
> +bs=4096
> +rextsize=4
> +filesz=$(((maxextlen + 1) * bs))
> +
> +must_disable_feature() {
> + local feat="$1"
> +
> + # If mkfs doesn't know about the feature, we don't need to disable it
> + $MKFS_XFS_PROG --help 2>&1 | grep -q "${feat}=0" || return 1
> +
> + # If turning the feature on works, we don't need to disable it
> + _scratch_mkfs_xfs_supported -m "${feat}=1" "${disabled_features[@]}" \
> + > /dev/null 2>&1 && return 1
> +
> + # Otherwise mkfs knows of the feature and formatting with it failed,
> + # so we do need to mask it.
> + return 0
> +}
> +
> +extra_options=""
> +# Set up the realtime device to reproduce the bug.
> +
> +# If we don't have a realtime device, set up a loop device on the test
> +# filesystem.
> +if [[ $USE_EXTERNAL != yes || -z $SCRATCH_RTDEV ]]; then
> + _require_test
> + loopsz="$((filesz + (1 << 26)))"
> + _require_fs_space "$TEST_DIR" $((loopsz / 1024))
> + $XFS_IO_PROG -c "truncate $loopsz" -f "$TEST_DIR/$seq"
> + loop_dev="$(_create_loop_device "$TEST_DIR/$seq")"
> + USE_EXTERNAL=yes
> + SCRATCH_RTDEV="$loop_dev"
> + disabled_features=()
> +
> + # disable reflink if not supported by realtime devices
> + must_disable_feature reflink &&
> + disabled_features=(-m reflink=0)
> +
> + # disable rmap if not supported by realtime devices
> + must_disable_feature rmapbt &&
> + disabled_features+=(-m rmapbt=0)
> +fi
> +extra_options="$extra_options -r extsize=$((bs * rextsize))"
> +extra_options="$extra_options -d agsize=$(((maxextlen + 1) * bs / 2)),rtinherit=1"
> +
> +_scratch_mkfs $extra_options "${disabled_features[@]}" >>$seqres.full 2>&1
> +_try_scratch_mount >>$seqres.full 2>&1 || \
> + _notrun "mount failed, kernel doesn't support realtime?"
> +_scratch_unmount
> +_scratch_mount
> +_require_fs_space "$SCRATCH_MNT" $((filesz / 1024))
> +
> +# Allocate maxextlen + 1 blocks. As long as the allocator does something sane,
> +# we should end up with two extents that look something like:
> +#
> +# u3.bmx[0-1] = [startoff,startblock,blockcount,extentflag]
> +# 0:[0,0,2097148,1]
> +# 1:[2097148,2097148,4,1]
> +#
> +# Extent 0 has blockcount = ALIGN_DOWN(maxextlen, rextsize). Extent 1 is
> +# adjacent and has blockcount = rextsize. Both are unwritten.
> +$XFS_IO_PROG -c "falloc 0 $filesz" -c fsync -f "$SCRATCH_MNT/file"
> +
> +# Write extent 0 + one block of extent 1. Our extents should end up like so:
> +#
> +# u3.bmx[0-1] = [startoff,startblock,blockcount,extentflag]
> +# 0:[0,0,2097149,0]
> +# 1:[2097149,2097149,3,1]
> +#
> +# Extent 0 is written and has blockcount = ALIGN_DOWN(maxextlen, rextsize) + 1,
> +# Extent 1 is adjacent, unwritten, and has blockcount = rextsize - 1 and
> +# startblock % rextsize = 1.
> +#
> +# The -b is just to speed things up (doing GBs of I/O in 4k chunks kind of
> +# sucks).
> +$XFS_IO_PROG -c "pwrite -b 1M -W 0 $(((maxextlen + 2 - rextsize) * bs))" \
> + "$SCRATCH_MNT/file" >> "$seqres.full"
> +
> +# Truncate the extents.
> +$XFS_IO_PROG -c "truncate 0" -c fsync "$SCRATCH_MNT/file"
> +
> +# We need to do this before the loop device gets torn down.
> +_scratch_unmount
> +_check_scratch_fs
> +
> +echo "Silence is golden"
> +status=0
> +exit
> diff --git a/tests/xfs/650.out b/tests/xfs/650.out
> new file mode 100644
> index 000000000000..d7a3e4b63483
> --- /dev/null
> +++ b/tests/xfs/650.out
> @@ -0,0 +1,2 @@
> +QA output created by 650
> +Silence is golden
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