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Thu, 28 Mar 2024 20:40:54 +0000 (UTC) From: Stefan Hajnoczi To: linux-block@vger.kernel.org Cc: linux-kernel@vger.kernel.org, eblake@redhat.com, Alasdair Kergon , Mikulas Patocka , dm-devel@lists.linux.dev, David Teigland , Mike Snitzer , Jens Axboe , Christoph Hellwig , Joe Thornber , Stefan Hajnoczi Subject: [RFC 9/9] selftests: block_seek_hole: add dm-thin test Date: Thu, 28 Mar 2024 16:39:10 -0400 Message-ID: <20240328203910.2370087-10-stefanha@redhat.com> In-Reply-To: <20240328203910.2370087-1-stefanha@redhat.com> References: <20240328203910.2370087-1-stefanha@redhat.com> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.1 Signed-off-by: Stefan Hajnoczi --- .../selftests/block_seek_hole/Makefile | 2 +- .../selftests/block_seek_hole/dm_thin.sh | 80 +++++++++++++++++++ 2 files changed, 81 insertions(+), 1 deletion(-) create mode 100755 tools/testing/selftests/block_seek_hole/dm_thin.sh diff --git a/tools/testing/selftests/block_seek_hole/Makefile b/tools/testing/selftests/block_seek_hole/Makefile index 1bd9e748b2acc..3b4ee1b1fb6e7 100644 --- a/tools/testing/selftests/block_seek_hole/Makefile +++ b/tools/testing/selftests/block_seek_hole/Makefile @@ -3,7 +3,7 @@ PY3 = $(shell which python3 2>/dev/null) ifneq ($(PY3),) -TEST_PROGS := test.py dm_zero.sh +TEST_PROGS := test.py dm_zero.sh dm_thin.sh include ../lib.mk diff --git a/tools/testing/selftests/block_seek_hole/dm_thin.sh b/tools/testing/selftests/block_seek_hole/dm_thin.sh new file mode 100755 index 0000000000000..a379b7c875f28 --- /dev/null +++ b/tools/testing/selftests/block_seek_hole/dm_thin.sh @@ -0,0 +1,80 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0-only +# +# dm_thin.sh +# +# Test that dm-thin supports SEEK_HOLE/SEEK_DATA. + +set -e + +# check +# Check that the actual output matches the expected output. +check() { + if [ "$1" != "$2" ]; then + echo 'FAIL expected:' + echo "$2" + echo 'Does not match device output:' + echo "$1" + exit 1 + fi +} + +cleanup() { + if [ -n "$thin_name" ]; then + dmsetup remove $thin_name + fi + if [ -n "$pool_name" ]; then + dmsetup remove $pool_name + fi + if [ -n "$metadata_path" ]; then + losetup --detach "$metadata_path" + fi + if [ -n "$data_path" ]; then + losetup --detach "$data_path" + fi + rm -f pool-metadata pool-data +} +trap cleanup EXIT + +rm -f pool-metadata pool-data +truncate -s 256M pool-metadata +truncate -s 1G pool-data + +size_sectors=$((1024 * 1024 * 1024 / 512)) # 1 GB +metadata_path=$(losetup --show --find pool-metadata) +data_path=$(losetup --show --find pool-data) +pool_name=pool-$$ +thin_name=thin-$$ + +dmsetup create $pool_name \ + --table "0 $size_sectors thin-pool $metadata_path $data_path 128 $size_sectors" +dmsetup message /dev/mapper/$pool_name 0 'create_thin 0' +dmsetup create $thin_name --table "0 $size_sectors thin /dev/mapper/$pool_name 0" + +# Verify that the device is empty +check "$(./map_holes.py /dev/mapper/$thin_name)" 'TYPE START END SIZE +HOLE 0 1073741824 1073741824' + +# Write 4k at offset 128M but dm-thin will actually map an entire 64k block +dd if=/dev/urandom of=/dev/mapper/$thin_name bs=4k count=1 seek=32768 status=none +check "$(./map_holes.py /dev/mapper/$thin_name)" 'TYPE START END SIZE +HOLE 0 134217728 134217728 +DATA 134217728 134283264 65536 +HOLE 134283264 1073741824 939458560' + +# Write at the beginning of the device +dd if=/dev/urandom of=/dev/mapper/$thin_name bs=4k count=1 status=none +check "$(./map_holes.py /dev/mapper/$thin_name)" 'TYPE START END SIZE +DATA 0 65536 65536 +HOLE 65536 134217728 134152192 +DATA 134217728 134283264 65536 +HOLE 134283264 1073741824 939458560' + +# Write at the end of the device +dd if=/dev/urandom of=/dev/mapper/$thin_name bs=4k count=1 seek=262143 status=none +check "$(./map_holes.py /dev/mapper/$thin_name)" 'TYPE START END SIZE +DATA 0 65536 65536 +HOLE 65536 134217728 134152192 +DATA 134217728 134283264 65536 +HOLE 134283264 1073676288 939393024 +DATA 1073676288 1073741824 65536'