From b4841fd40fefcffc99c4b52c8a06720edb4ef9ef Mon Sep 17 00:00:00 2001
From: Thomas Huth <thuth@redhat.com>
Date: Fri, 30 Aug 2019 12:56:28 +0100
Subject: [PATCH 10/10] iotests: Test allocate_first_block() with O_DIRECT

RH-Author: Thomas Huth <thuth@redhat.com>
Message-id: <20190830125628.23668-6-thuth@redhat.com>
Patchwork-id: 90212
O-Subject: [RHEL-8.1.0 qemu-kvm PATCH v2 5/5] iotests: Test allocate_first_block() with O_DIRECT
Bugzilla: 1738839
RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
RH-Acked-by: Max Reitz <mreitz@redhat.com>
RH-Acked-by: David Hildenbrand <david@redhat.com>

From: Nir Soffer <nirsof@gmail.com>

Using block_resize we can test allocate_first_block() with file
descriptor opened with O_DIRECT, ensuring that it works for any size
larger than 4096 bytes.

Testing smaller sizes is tricky as the result depends on the filesystem
used for testing. For example on NFS any size will work since O_DIRECT
does not require any alignment.

Signed-off-by: Nir Soffer <nsoffer@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: 20190827010528.8818-3-nsoffer@redhat.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
(cherry picked from commit 4656fb5ebbece8c7bbca0bef56bea882c94b9132)
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
---
 tests/qemu-iotests/175     | 28 ++++++++++++++++++++++++++++
 tests/qemu-iotests/175.out |  8 ++++++++
 2 files changed, 36 insertions(+)

diff --git a/tests/qemu-iotests/175 b/tests/qemu-iotests/175
index b3b7712..74ca49d 100755
--- a/tests/qemu-iotests/175
+++ b/tests/qemu-iotests/175
@@ -50,6 +50,23 @@ _filter_blocks()
         -e "s/blocks=$((extra_blocks + img_size / 512))\\(\$\\|[^0-9]\\)/max allocation/"
 }
 
+# Resize image using block_resize.
+# Parameter 1: image path
+# Parameter 2: new size
+_block_resize()
+{
+    local path=$1
+    local size=$2
+
+    $QEMU -qmp stdio -nographic -nodefaults \
+        -blockdev file,node-name=file,filename=$path,cache.direct=on \
+        <<EOF
+{'execute': 'qmp_capabilities'}
+{'execute': 'block_resize', 'arguments': {'node-name': 'file', 'size': $size}}
+{'execute': 'quit'}
+EOF
+}
+
 # get standard environment, filters and checks
 . ./common.rc
 . ./common.filter
@@ -58,6 +75,9 @@ _supported_fmt raw
 _supported_proto file
 _supported_os Linux
 
+_default_cache_mode none
+_supported_cache_modes none directsync
+
 size=$((1 * 1024 * 1024))
 
 touch "$TEST_DIR/empty"
@@ -80,6 +100,14 @@ for mode in off full falloc; do
     stat -c "size=%s, blocks=%b" $TEST_IMG | _filter_blocks $extra_blocks $min_blocks $size
 done
 
+for new_size in 4096 1048576; do
+    echo
+    echo "== resize empty image with block_resize =="
+    _make_test_img 0 | _filter_imgfmt
+    _block_resize $TEST_IMG $new_size >/dev/null
+    stat -c "size=%s, blocks=%b" $TEST_IMG | _filter_blocks $extra_blocks $min_blocks $new_size
+done
+
 # success, all done
 echo "*** done"
 rm -f $seq.full
diff --git a/tests/qemu-iotests/175.out b/tests/qemu-iotests/175.out
index 263e521..39c2ee0 100644
--- a/tests/qemu-iotests/175.out
+++ b/tests/qemu-iotests/175.out
@@ -15,4 +15,12 @@ size=1048576, max allocation
 == creating image with preallocation falloc ==
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576 preallocation=falloc
 size=1048576, max allocation
+
+== resize empty image with block_resize ==
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=0
+size=4096, min allocation
+
+== resize empty image with block_resize ==
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=0
+size=1048576, min allocation
  *** done
-- 
1.8.3.1