[PATCH 0/2] dm-thinp helpers and demo test

[PATCH 0/2] dm-thinp helpers and demo test

[Eric Sandeen]

Patch one adds common/dmthin to create & manipulate a dm-thin device

Patch two is a POC test which uses that harness; it may not be
at all what we want to test, just putting it out there as a demo.

[PATCH 1/2] dm-thinp helpers in common/dmthin

[Eric Sandeen]

Basic dm-thinp helpers to set up, tear down, grow, check,
and set no-space behavior for a single thin dm volume built
on $SCRATCH_DEV.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
---

diff --git a/common/dmthin b/common/dmthin
new file mode 100644
index 0000000..0c0d20d
--- /dev/null
+++ b/common/dmthin
@@ -0,0 +1,238 @@
+#!/bin/bash
+#
+# Copyright (c) 2015 Red Hat, Inc.  All Rights Reserved.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it would be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write the Free Software Foundation,
+# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#
+#
+# common functions for setting up and tearing down a dmthin device
+
+# SOOO many devices!
+# Create the 2 pool devices on lvs so we can build the whole thing
+# from a single scratch device
+
+# Backing data dev
+DMTHIN_DATA_NAME="thin-data"
+DMTHIN_DATA_DEV="/dev/mapper/$DMTHIN_DATA_NAME"
+# Backing metadata dev
+DMTHIN_META_NAME="thin-meta"
+DMTHIN_META_DEV="/dev/mapper/$DMTHIN_META_NAME"
+# Backing pool dev (combination of above)
+DMTHIN_POOL_NAME="thin-pool"
+DMTHIN_POOL_DEV="/dev/mapper/$DMTHIN_POOL_NAME"
+# Thin volume
+DMTHIN_VOL_NAME="thin-vol"
+DMTHIN_VOL_DEV="/dev/mapper/$DMTHIN_VOL_NAME"
+
+_dmthin_cleanup()
+{
+	$UMOUNT_PROG $SCRATCH_MNT > /dev/null 2>&1
+	$DMSETUP_PROG remove $DMTHIN_VOL_NAME> /dev/null 2>&1
+	$DMSETUP_PROG remove $DMTHIN_POOL_NAME> /dev/null 2>&1
+	$DMSETUP_PROG remove $DMTHIN_META_NAME> /dev/null 2>&1
+	$DMSETUP_PROG remove $DMTHIN_DATA_NAME> /dev/null 2>&1
+}
+
+_dmthin_check_fs()
+{
+	_check_scratch_fs $DMTHIN_VOL_DEV
+}
+
+# Set up a dm-thin device on $SCRATCH_DEV
+#
+# All arguments are optional, and in this order; defaults follows:
+# data_dev_size: half of $SCRATCH_DEV
+# virtual_size: 10x $data_dev_size
+# cluster_size: 512k
+# low_water: 100M
+#
+# You may specify 0 to 4 of these arguments, but they
+# must be in the above order.
+_dmthin_init()
+{
+	local data_dev_size=$1	# Backing pool data size in sectors
+	local virtual_size=$2	# Virtual size in sectors
+	local cluster_size=$3   # cluster/alloc size, sectors
+	local low_water=$4	# low water mark, sectors
+
+	local dm_backing_dev=$SCRATCH_DEV
+	local blk_dev_size=`blockdev --getsz $dm_backing_dev`
+
+	local pool_id=$RANDOM
+
+	# Default to something small-ish
+	if [ -z "$data_dev_size" ]; then
+		data_dev_size=$(($blk_dev_size / 2))
+	fi
+
+	# Default to something big-is; 10x backing
+	if [ -z "$virtual_size" ]; then
+		virtual_size=$(($data_dev_size * 10))
+	fi
+
+	# Default to 512k
+	if [ -z "$cluster_size" ]; then
+		cluster_size=1024	# 512k in sectors
+	fi
+
+	# Default to 100M
+	if [ -z "$low_water" ]; then
+		low_water=204800	# 100M, in sectors
+	fi
+
+	# Need to make linear metadata and data devs.  From kernel docs:
+	# As a guide, we suggest you calculate the number of bytes to use in the
+	# metadata device as 48 * $data_dev_size / $data_block_size but round it up
+	# to 2MB (4096 sectors) if the answer is smaller.
+	# So do that:
+
+	local meta_dev_size=$((48 * $data_dev_size / $cluster_size))
+	if [ "$meta_dev_size" -lt "4096" ]; then
+		meta_dev_size=4096	# 2MB
+	fi
+
+	# scratch dev gets a metadata vol & data vol, start at this offset
+	local meta_dev_offset=10240
+
+	local total_data_dev_size=$(($meta_dev_offset + $meta_dev_size + $data_dev_size))
+	if [ "$total_data_dev_size" -gt "$blk_dev_size" ]; then
+		_notrun "$SCRATCH_DEV too small"
+	fi
+
+	# Unmount & tear down old stuff
+	_dmthin_cleanup
+
+	# Metadata device
+	DMTHIN_META_TABLE="0 $meta_dev_size linear $dm_backing_dev $meta_dev_offset"
+	$DMSETUP_PROG create $DMTHIN_META_NAME --table "$DMTHIN_META_TABLE" || \
+		_fatal "failed to create dm thin meta device"
+
+	# Data device
+	local data_dev_offset=$((meta_dev_offset + $meta_dev_size))
+	DMTHIN_DATA_TABLE="0 $data_dev_size linear $dm_backing_dev $data_dev_offset"
+	$DMSETUP_PROG create $DMTHIN_DATA_NAME --table "$DMTHIN_DATA_TABLE" || \
+		_fatal "failed to create dm thin data device"
+
+	# Zap the pool metadata dev
+	dd if=/dev/zero of=$DMTHIN_META_DEV bs=4096 count=1 &>/dev/null
+
+	# Thin pool
+	# "start length thin-pool metadata_dev data_dev data_block_size low_water_mark"
+	DMTHIN_POOL_TABLE="0 $data_dev_size thin-pool $DMTHIN_META_DEV $DMTHIN_DATA_DEV $cluster_size $low_water"
+	$DMSETUP_PROG create $DMTHIN_POOL_NAME --table "$DMTHIN_POOL_TABLE" || \
+		_fatal "failed to create dm thin pool device"
+
+	# Thin volume
+	$DMSETUP_PROG message $DMTHIN_POOL_DEV 0 "create_thin $pool_id" || \
+		_fatal "failed to message pool device"
+
+	# start length thin pool_dev dev_id [external_origin_dev]
+	DMTHIN_VOL_TABLE="0 $virtual_size thin $DMTHIN_POOL_DEV $pool_id"
+	$DMSETUP_PROG create $DMTHIN_VOL_NAME --table "$DMTHIN_VOL_TABLE" || \
+		_fatal "failed to create dm thin volume device"
+
+}
+
+# for internal use
+_dmthin_reload_table()
+{
+	local dev_name=$1
+	local table="$2"
+
+	$DMSETUP_PROG suspend $dev_name || \
+		_fail  "dmsetup suspend of $dev_name failed"
+
+	$DMSETUP_PROG load $dev_name --table "$table" || \
+		_fail "dmsetup failed to reload $dev_name table"
+
+	$DMSETUP_PROG resume $dev_name || \
+		_fail  "dmsetup resume of $dev_name failed"
+
+}
+
+# Grow the dm-thin device by the given amount
+# Argument is number of sectors to add, if not specified
+# defaults to 1/4 of the $SCRATCH_DEV size
+_dmthin_grow()
+{
+	local add_sectors=$1	# Number of sectors to add
+
+	local dm_backing_dev=$SCRATCH_DEV
+	local blk_dev_size=`blockdev --getsz $dm_backing_dev`
+
+	# Get current sizes & values
+	local   meta_dev_size=`$DMSETUP_PROG table | grep $DMTHIN_META_NAME | awk '{print $3}'`
+	local meta_dev_offset=`$DMSETUP_PROG table | grep $DMTHIN_META_NAME | awk '{print $6}'`
+	local   data_dev_size=`$DMSETUP_PROG table | grep $DMTHIN_DATA_NAME | awk '{print $3}'`
+	local   pool_dev_size=`$DMSETUP_PROG table | grep $DMTHIN_POOL_NAME | awk '{print $3}'`
+	local    cluster_size=`$DMSETUP_PROG table | grep $DMTHIN_POOL_NAME | awk '{print $7}'`
+	local       low_water=`$DMSETUP_PROG table | grep $DMTHIN_POOL_NAME | awk '{print $8}'`
+
+	# default to 25% growth
+	if [ -z "$add_sectors" ]; then
+		add_sectors=$(($data_dev_size / 4))
+	fi
+
+	local data_dev_offset=$(($meta_dev_offset + $meta_dev_size))
+
+	# Figure new sizes
+	data_dev_size=$(($data_dev_size + $add_sectors))
+	pool_dev_size=$(($pool_dev_size + $add_sectors))
+
+	# Can we do this?
+	local total_data_dev_size=$(($meta_dev_offset + $meta_dev_size + $data_dev_size))
+	if [ "$total_data_dev_size" -gt "$blk_dev_size" ]; then
+		_fail "$SCRATCH_DEV too small"
+	fi
+
+	# Grow the data device
+	DMTHIN_DATA_TABLE="0 $data_dev_size linear $dm_backing_dev $data_dev_offset"
+	_dmthin_reload_table $DMTHIN_DATA_NAME "$DMTHIN_DATA_TABLE"
+
+	# Grow the pool
+	DMTHIN_POOL_TABLE="0 $data_dev_size thin-pool $DMTHIN_META_DEV $DMTHIN_DATA_DEV $cluster_size $low_water"
+	_dmthin_reload_table $DMTHIN_POOL_NAME "$DMTHIN_POOL_TABLE"
+}
+
+# Queue IOs when full
+_dmthin_set_queue()
+{
+	local   data_dev_size=`$DMSETUP_PROG table | grep $DMTHIN_DATA_NAME | awk '{print $3}'`
+	local    cluster_size=`$DMSETUP_PROG table | grep $DMTHIN_POOL_NAME | awk '{print $7}'`
+	local       low_water=`$DMSETUP_PROG table | grep $DMTHIN_POOL_NAME | awk '{print $8}'`
+
+	DMTHIN_POOL_TABLE="0 $data_dev_size thin-pool $DMTHIN_META_DEV $DMTHIN_DATA_DEV $cluster_size $low_water"
+	_dmthin_reload_table $DMTHIN_POOL_NAME "$DMTHIN_POOL_TABLE"
+}
+
+# Fail IOs when full
+_dmthin_set_fail()
+{
+	local   data_dev_size=`$DMSETUP_PROG table | grep $DMTHIN_DATA_NAME | awk '{print $3}'`
+	local    cluster_size=`$DMSETUP_PROG table | grep $DMTHIN_POOL_NAME | awk '{print $7}'`
+	local       low_water=`$DMSETUP_PROG table | grep $DMTHIN_POOL_NAME | awk '{print $8}'`
+
+	DMTHIN_POOL_TABLE="0 $data_dev_size thin-pool $DMTHIN_META_DEV $DMTHIN_DATA_DEV $cluster_size $low_water 1 error_if_no_space"
+	_dmthin_reload_table $DMTHIN_POOL_NAME "$DMTHIN_POOL_TABLE"
+}
+
+_dmthin_mount_options()
+{
+	echo `_common_dev_mount_options $*` $DMTHIN_VOL_DEV $SCRATCH_MNT
+}
+
+_dmthin_mount()
+{
+	_mount -t $FSTYP `_dmthin_mount_options $*`
+}

Re: [PATCH 1/2] dm-thinp helpers in common/dmthin

[Eryu Guan]

On Wed, Oct 21, 2015 at 03:53:23PM -0500, Eric Sandeen wrote:
> Basic dm-thinp helpers to set up, tear down, grow, check,
> and set no-space behavior for a single thin dm volume built
> on $SCRATCH_DEV.
> 
> Signed-off-by: Eric Sandeen <sandeen@redhat.com>

Looks good to me. We're planning to add more thinp tests using this
framework, and we can always improve the dmthin framework. For now

Reviewed-by: Eryu Guan <eguan@redhat.com>

[PATCH 2/2] dm-thinp demo test

[Eric Sandeen]

Fairly trivial test to use the dm-thin infrastructure.

Right now it exhausts space in queue-on-error mode,
adds more space, does a bit more IO, then unmounts &
checks the fs.

Not sure if that's valid to test, but it works here and
demonstrates the common/dmthin helpers.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
---



diff --git a/tests/generic/115 b/tests/generic/115
new file mode 100755
index 0000000..ef9d881
--- /dev/null
+++ b/tests/generic/115
@@ -0,0 +1,85 @@
+#! /bin/bash
+# FS QA Test No. generic/115
+#
+# Test very basic thin device usage, exhaustion, and growth
+#
+# Copyright (c) 2015 Red Hat, Inc.  All Rights Reserved.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it would be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write the Free Software Foundation,
+# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#
+
+seq=`basename $0`
+seqres=$RESULT_DIR/$seq
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+
+status=1	# failure is the default!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+BACKING_SIZE=$((500 * 1024 * 1024 / 512))	# 500M
+VIRTUAL_SIZE=$((10 * $BACKING_SIZE))		# 5000M
+GROW_SIZE=$((100 * 1024 * 1024 / 512))		# 100M
+
+_cleanup()
+{
+	_dmthin_cleanup
+	rm -f $tmp.*
+}
+
+_setup_thin()
+{
+	_dmthin_init $BACKING_SIZE $VIRTUAL_SIZE
+	_dmthin_set_queue
+	_mkfs_dev $DMTHIN_VOL_DEV
+	_dmthin_mount
+}
+
+_workout()
+{
+	# Overfill it by a bit
+	for I in `seq 1 500`; do
+		$XFS_IO_PROG -f -c "pwrite -W 0 1M" $SCRATCH_MNT/file$I &>/dev/null
+	done
+
+	sync
+
+	_dmthin_grow  $GROW_SIZE
+
+	# Write a little more, but don't fill
+	for I in `seq 501 510`; do
+		$XFS_IO_PROG -f -c "pwrite 0 1M" $SCRATCH_MNT/file$I &>/dev/null
+	done
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/dmthin
+
+_supported_fs generic
+_supported_os Linux
+_need_to_be_root
+_require_dm_target thin
+
+_setup_thin
+_dmthin_set_queue
+_workout
+_dmthin_check_fs
+_dmthin_cleanup
+
+echo "=== completed"
+
+status=0
+exit
diff --git a/tests/generic/115.out b/tests/generic/115.out
new file mode 100644
index 0000000..39ebd87
--- /dev/null
+++ b/tests/generic/115.out
@@ -0,0 +1,2 @@
+QA output created by 115
+=== completed
diff --git a/tests/generic/group b/tests/generic/group
index 1dd4269..729578d 100644
--- a/tests/generic/group
+++ b/tests/generic/group
@@ -115,6 +115,7 @@
 112 rw aio auto quick
 113 rw aio auto quick
 114 rw aio auto quick
+115 rw thin auto quick
 117 attr auto quick
 120 other auto quick
 123 perms auto quick

Re: [PATCH 2/2] dm-thinp demo test

[Eryu Guan]

On Wed, Oct 21, 2015 at 03:56:08PM -0500, Eric Sandeen wrote:
> Fairly trivial test to use the dm-thin infrastructure.
> 
> Right now it exhausts space in queue-on-error mode,
> adds more space, does a bit more IO, then unmounts &
> checks the fs.
> 
> Not sure if that's valid to test, but it works here and
> demonstrates the common/dmthin helpers.
> 
> Signed-off-by: Eric Sandeen <sandeen@redhat.com>
> ---
> 
> 
> 
> diff --git a/tests/generic/115 b/tests/generic/115
> new file mode 100755
> index 0000000..ef9d881
> --- /dev/null
> +++ b/tests/generic/115
> @@ -0,0 +1,85 @@
> +#! /bin/bash
> +# FS QA Test No. generic/115
> +#
> +# Test very basic thin device usage, exhaustion, and growth
> +#
> +# Copyright (c) 2015 Red Hat, Inc.  All Rights Reserved.
> +#
> +# This program is free software; you can redistribute it and/or
> +# modify it under the terms of the GNU General Public License as
> +# published by the Free Software Foundation.
> +#
> +# This program is distributed in the hope that it would be useful,
> +# but WITHOUT ANY WARRANTY; without even the implied warranty of
> +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> +# GNU General Public License for more details.
> +#
> +# You should have received a copy of the GNU General Public License
> +# along with this program; if not, write the Free Software Foundation,
> +# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
> +#
> +
> +seq=`basename $0`
> +seqres=$RESULT_DIR/$seq
> +echo "QA output created by $seq"
> +
> +here=`pwd`
> +tmp=/tmp/$$
> +
> +status=1	# failure is the default!
> +trap "_cleanup; exit \$status" 0 1 2 3 15
> +
> +BACKING_SIZE=$((500 * 1024 * 1024 / 512))	# 500M
> +VIRTUAL_SIZE=$((10 * $BACKING_SIZE))		# 5000M
> +GROW_SIZE=$((100 * 1024 * 1024 / 512))		# 100M
> +
> +_cleanup()
> +{
> +	_dmthin_cleanup
> +	rm -f $tmp.*
> +}
> +
> +_setup_thin()
> +{
> +	_dmthin_init $BACKING_SIZE $VIRTUAL_SIZE
> +	_dmthin_set_queue
> +	_mkfs_dev $DMTHIN_VOL_DEV
> +	_dmthin_mount
> +}
> +
> +_workout()
> +{
> +	# Overfill it by a bit
> +	for I in `seq 1 500`; do
> +		$XFS_IO_PROG -f -c "pwrite -W 0 1M" $SCRATCH_MNT/file$I &>/dev/null
> +	done
> +
> +	sync
> +
> +	_dmthin_grow  $GROW_SIZE
> +
> +	# Write a little more, but don't fill
> +	for I in `seq 501 510`; do
> +		$XFS_IO_PROG -f -c "pwrite 0 1M" $SCRATCH_MNT/file$I &>/dev/null
> +	done
> +}
> +
> +# get standard environment, filters and checks
> +. ./common/rc
> +. ./common/dmthin
> +
> +_supported_fs generic
> +_supported_os Linux
> +_need_to_be_root
> +_require_dm_target thin

This doesn't work for me with 4.3-rc4 kernel. I have to
"_require_dm_target thin-pool", modprobe dm-thin reports no module
found.

> +
> +_setup_thin
> +_dmthin_set_queue

This one or the one in _setup_thin can be removed?

> +_workout
> +_dmthin_check_fs

btrfs fails the fs check, because btrfs changes lv device name in df
output, from /dev/mapper/xxx to /dev/dm-x, so _check_scratch_fs couldn't
umount it and btrfsck runs on mounted btrfs.

Adding "$UMOUNT_PROG $SCRATCH_MNT" before _dmthin_check_fs is a
workaround, though I think it's a btrfs issue.

Thanks,
Eryu

> +_dmthin_cleanup
> +
> +echo "=== completed"
> +
> +status=0
> +exit
> diff --git a/tests/generic/115.out b/tests/generic/115.out
> new file mode 100644
> index 0000000..39ebd87
> --- /dev/null
> +++ b/tests/generic/115.out
> @@ -0,0 +1,2 @@
> +QA output created by 115
> +=== completed
> diff --git a/tests/generic/group b/tests/generic/group
> index 1dd4269..729578d 100644
> --- a/tests/generic/group
> +++ b/tests/generic/group
> @@ -115,6 +115,7 @@
>  112 rw aio auto quick
>  113 rw aio auto quick
>  114 rw aio auto quick
> +115 rw thin auto quick
>  117 attr auto quick
>  120 other auto quick
>  123 perms auto quick
> 
> 
> --
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Re: [PATCH 2/2] dm-thinp demo test

[Eric Sandeen]

On 10/22/15 4:47 AM, Eryu Guan wrote:
> On Wed, Oct 21, 2015 at 03:56:08PM -0500, Eric Sandeen wrote:
>> Fairly trivial test to use the dm-thin infrastructure.
>>
>> Right now it exhausts space in queue-on-error mode,
>> adds more space, does a bit more IO, then unmounts &
>> checks the fs.
>>
>> Not sure if that's valid to test, but it works here and
>> demonstrates the common/dmthin helpers.
>>
>> Signed-off-by: Eric Sandeen <sandeen@redhat.com>
>> ---
>>
>>
>>
>> diff --git a/tests/generic/115 b/tests/generic/115
>> new file mode 100755
>> index 0000000..ef9d881
>> --- /dev/null
>> +++ b/tests/generic/115
>> @@ -0,0 +1,85 @@
>> +#! /bin/bash
>> +# FS QA Test No. generic/115
>> +#
>> +# Test very basic thin device usage, exhaustion, and growth
>> +#
>> +# Copyright (c) 2015 Red Hat, Inc.  All Rights Reserved.
>> +#
>> +# This program is free software; you can redistribute it and/or
>> +# modify it under the terms of the GNU General Public License as
>> +# published by the Free Software Foundation.
>> +#
>> +# This program is distributed in the hope that it would be useful,
>> +# but WITHOUT ANY WARRANTY; without even the implied warranty of
>> +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> +# GNU General Public License for more details.
>> +#
>> +# You should have received a copy of the GNU General Public License
>> +# along with this program; if not, write the Free Software Foundation,
>> +# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
>> +#
>> +
>> +seq=`basename $0`
>> +seqres=$RESULT_DIR/$seq
>> +echo "QA output created by $seq"
>> +
>> +here=`pwd`
>> +tmp=/tmp/$$
>> +
>> +status=1	# failure is the default!
>> +trap "_cleanup; exit \$status" 0 1 2 3 15
>> +
>> +BACKING_SIZE=$((500 * 1024 * 1024 / 512))	# 500M
>> +VIRTUAL_SIZE=$((10 * $BACKING_SIZE))		# 5000M
>> +GROW_SIZE=$((100 * 1024 * 1024 / 512))		# 100M
>> +
>> +_cleanup()
>> +{
>> +	_dmthin_cleanup
>> +	rm -f $tmp.*
>> +}
>> +
>> +_setup_thin()
>> +{
>> +	_dmthin_init $BACKING_SIZE $VIRTUAL_SIZE
>> +	_dmthin_set_queue
>> +	_mkfs_dev $DMTHIN_VOL_DEV
>> +	_dmthin_mount
>> +}
>> +
>> +_workout()
>> +{
>> +	# Overfill it by a bit
>> +	for I in `seq 1 500`; do
>> +		$XFS_IO_PROG -f -c "pwrite -W 0 1M" $SCRATCH_MNT/file$I &>/dev/null
>> +	done
>> +
>> +	sync
>> +
>> +	_dmthin_grow  $GROW_SIZE
>> +
>> +	# Write a little more, but don't fill
>> +	for I in `seq 501 510`; do
>> +		$XFS_IO_PROG -f -c "pwrite 0 1M" $SCRATCH_MNT/file$I &>/dev/null
>> +	done
>> +}
>> +
>> +# get standard environment, filters and checks
>> +. ./common/rc
>> +. ./common/dmthin
>> +
>> +_supported_fs generic
>> +_supported_os Linux
>> +_need_to_be_root
>> +_require_dm_target thin
> 
> This doesn't work for me with 4.3-rc4 kernel. I have to
> "_require_dm_target thin-pool", modprobe dm-thin reports no module
> found.

whoops, yep, sorry - i already had it loaded, and the modprobe
failure isn't fatal.  Should be thin-pool - thanks.

>> +
>> +_setup_thin
>> +_dmthin_set_queue
> 
> This one or the one in _setup_thin can be removed?

Yep, will do.

>> +_workout
>> +_dmthin_check_fs
> 
> btrfs fails the fs check, because btrfs changes lv device name in df
> output, from /dev/mapper/xxx to /dev/dm-x, so _check_scratch_fs couldn't
> umount it and btrfsck runs on mounted btrfs.

Huh, weird.  I'll admit that I did not test btrfs.  Other filesystems
worked for you?  I'm not sure how btrfs can change df output...

mapper symlinks have been a constant source of pain for fstests.  :(

> Adding "$UMOUNT_PROG $SCRATCH_MNT" before _dmthin_check_fs is a
> workaround, though I think it's a btrfs issue.

Hm, ok, thanks; easy enough to do that I guess.

-Eric

Re: [PATCH 2/2] dm-thinp demo test

[Eric Sandeen]

On 10/22/15 9:14 AM, Eric Sandeen wrote:
>>> +_workout
>>> >> +_dmthin_check_fs
>> > 
>> > btrfs fails the fs check, because btrfs changes lv device name in df
>> > output, from /dev/mapper/xxx to /dev/dm-x, so _check_scratch_fs couldn't
>> > umount it and btrfsck runs on mounted btrfs.
> Huh, weird.  I'll admit that I did not test btrfs.  Other filesystems
> worked for you?  I'm not sure how btrfs can change df output...
> 
> mapper symlinks have been a constant source of pain for fstests.  :(
> 
>> > Adding "$UMOUNT_PROG $SCRATCH_MNT" before _dmthin_check_fs is a
>> > workaround, though I think it's a btrfs issue.
> Hm, ok, thanks; easy enough to do that I guess.

ALthough, it seems to be working for me here; I do fail because btrfs
emits a warning in dmesg:

[215098.204612] BTRFS warning (device dm-6): Skipping commit of aborted transaction.
[215098.212074] ------------[ cut here ]------------
[215098.216794] WARNING: CPU: 3 PID: 19408 at fs/btrfs/transaction.c:1708 cleanup_transaction+0x86/0x2c0 [btrfs]()

which leads to:

_check_dmesg: something found in dmesg (see /mnt/test2/git/xfstests/results//generic/115.dmesg)
Ran: generic/115
Failures: generic/115

It's "just" a warning, though, so I'm not really sure this should be failing the test.

-Eric

Re: [PATCH v2] fstests: dm-thinp demo test

[Eryu Guan]

On Thu, Feb 04, 2016 at 06:04:21PM +0800, Xiong Zhou wrote:
> From: Eric Sandeen <sandeen@redhat.com>
> 
> Fairly trivial test to use the dm-thin infrastructure.
> 
> Right now it exhausts space in queue-on-error mode,
> adds more space, does a bit more IO, then unmounts &
> checks the fs.
> 
> Not sure if that's valid to test, but it works here and
> demonstrates the common/dmthin helpers.
> 
> Signed-off-by: Eric Sandeen <sandeen@redhat.com>
> Signed-off-by: Xiong Zhou <xzhou@redhat.com>

Looks good to me. Thanks!

Reviewed-by: Eryu Guan <eguan@redhat.com>