From 134b7dec6ec2d90616d7986afb3b3b7ca7a4c383 Mon Sep 17 00:00:00 2001 From: Max Reitz Date: Tue, 28 Jul 2020 14:08:04 +0200 Subject: [PATCH 1/3] block: Fix bdrv_aligned_p*v() for qiov_offset != 0 Since these functions take a @qiov_offset, they must always take it into account when working with @qiov. There are a couple of places where they do not, but they should. Fixes: 65cd4424b9df03bb5195351c33e04cbbecc0705c ("block/io: bdrv_aligned_preadv: use and support qiov_offset") Fixes: 28c4da28695bdbe04b336b2c9c463876cc3aaa6d ("block/io: bdrv_aligned_pwritev: use and support qiov_offset") Reported-by: Claudio Fontana Reported-by: Bruce Rogers Cc: qemu-stable@nongnu.org Signed-off-by: Max Reitz Message-Id: <20200728120806.265916-2-mreitz@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy Tested-by: Claudio Fontana Tested-by: Bruce Rogers --- block/io.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/block/io.c b/block/io.c index b6564e34c5..ad3a51ed53 100644 --- a/block/io.c +++ b/block/io.c @@ -1524,12 +1524,13 @@ static int coroutine_fn bdrv_aligned_preadv(BdrvChild *child, assert(num); ret = bdrv_driver_preadv(bs, offset + bytes - bytes_remaining, - num, qiov, bytes - bytes_remaining, 0); + num, qiov, + qiov_offset + bytes - bytes_remaining, 0); max_bytes -= num; } else { num = bytes_remaining; - ret = qemu_iovec_memset(qiov, bytes - bytes_remaining, 0, - bytes_remaining); + ret = qemu_iovec_memset(qiov, qiov_offset + bytes - bytes_remaining, + 0, bytes_remaining); } if (ret < 0) { goto out; @@ -2032,7 +2033,8 @@ static int coroutine_fn bdrv_aligned_pwritev(BdrvChild *child, } ret = bdrv_driver_pwritev(bs, offset + bytes - bytes_remaining, - num, qiov, bytes - bytes_remaining, + num, qiov, + qiov_offset + bytes - bytes_remaining, local_flags); if (ret < 0) { break; From ae159450e161b3e1e2c5b815d19632abbbbcd1a1 Mon Sep 17 00:00:00 2001 From: Max Reitz Date: Tue, 28 Jul 2020 14:08:05 +0200 Subject: [PATCH 2/3] iotests/028: Add test for cross-base-EOF reads Signed-off-by: Max Reitz Message-Id: <20200728120806.265916-3-mreitz@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy Tested-by: Vladimir Sementsov-Ogievskiy Tested-by: Claudio Fontana --- tests/qemu-iotests/028 | 19 +++++++++++++++++++ tests/qemu-iotests/028.out | 11 +++++++++++ 2 files changed, 30 insertions(+) diff --git a/tests/qemu-iotests/028 b/tests/qemu-iotests/028 index 5d043cef92..6dd3ae09a3 100755 --- a/tests/qemu-iotests/028 +++ b/tests/qemu-iotests/028 @@ -142,6 +142,25 @@ TEST_IMG="${TEST_IMG}.copy" io_zero readv $(( offset + 32 * 1024 )) 512 1024 32 _check_test_img +echo +echo '=== Reading across backing EOF in one operation ===' +echo + +# Use a cluster boundary as the base end here +base_size=$((3 * 1024 * 1024 * 1024)) + +TEST_IMG="$TEST_IMG.base" _make_test_img $base_size +_make_test_img -b "$TEST_IMG.base" -F $IMGFMT $image_size + +# Write 16 times 42 at the end of the base image +$QEMU_IO -c "write -P 42 $((base_size - 16)) 16" "$TEST_IMG.base" \ + | _filter_qemu_io + +# Read 32 bytes across the base EOF from the top; +# should be 16 times 0x2a, then 16 times 0x00 +$QEMU_IO -c "read -v $((base_size - 16)) 32" "$TEST_IMG" \ + | _filter_qemu_io + # success, all done echo "*** done" rm -f $seq.full diff --git a/tests/qemu-iotests/028.out b/tests/qemu-iotests/028.out index 12f82c6a6c..5a68de5c46 100644 --- a/tests/qemu-iotests/028.out +++ b/tests/qemu-iotests/028.out @@ -730,4 +730,15 @@ read 512/512 bytes at offset 3221257728 read 512/512 bytes at offset 3221258752 512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) No errors were found on the image. + +=== Reading across backing EOF in one operation === + +Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=3221225472 +Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=4294968832 backing_file=TEST_DIR/t.IMGFMT.base backing_fmt=IMGFMT +wrote 16/16 bytes at offset 3221225456 +16 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +bffffff0: 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a ................ +c0000000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ +read 32/32 bytes at offset 3221225456 +32 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) *** done From afac471b71da92d91cc56fb64c0719b8a4a2d96b Mon Sep 17 00:00:00 2001 From: Max Reitz Date: Tue, 28 Jul 2020 15:11:34 +0200 Subject: [PATCH 3/3] iotests/197: Fix for non-qcow2 formats While 197 is very much a qcow2 test, and it looks like the partial cluster case at the end (introduced in b0ddcbbb36a66a6) is specifically a qcow2 case, the whole test scripts actually marks itself to work with generic formats (and generic protocols, even). Said partial cluster case happened to work with non-qcow2 formats as well (mostly by accident), but 1855536256 broke that, because it sets the compat option, which does not work for non-qcow2 formats. So go the whole way and force IMGFMT=qcow2 and IMGPROTO=file, as done in other places in this test. Fixes: 1855536256eb0a5708b04b85f744de69559ea323 ("iotests/197: Fix for compat=0.10") Reported-by: Thomas Huth Signed-off-by: Max Reitz Message-Id: <20200728131134.902519-1-mreitz@redhat.com> Reviewed-by: Eric Blake --- tests/qemu-iotests/197 | 8 +++++--- tests/qemu-iotests/197.out | 2 +- 2 files changed, 6 insertions(+), 4 deletions(-) diff --git a/tests/qemu-iotests/197 b/tests/qemu-iotests/197 index 121959a09c..a161c89816 100755 --- a/tests/qemu-iotests/197 +++ b/tests/qemu-iotests/197 @@ -114,9 +114,11 @@ echo # Force compat=1.1, because writing zeroes on a v2 image without a # backing file would just result in an unallocated cluster -_make_test_img -o compat=1.1 1024 -$QEMU_IO -f $IMGFMT -C -c 'read 0 1024' "$TEST_IMG" | _filter_qemu_io -$QEMU_IO -f $IMGFMT -c map "$TEST_IMG" +# (Also, note that this is really a pure qcow2 test.) +IMGPROTO=file IMGFMT=qcow2 TEST_IMG_FILE="$TEST_WRAP" \ + _make_test_img --no-opts -o compat=1.1 1024 +$QEMU_IO -f qcow2 -C -c 'read 0 1024' "$TEST_WRAP" | _filter_qemu_io +$QEMU_IO -f qcow2 -c map "$TEST_WRAP" _check_test_img # success, all done diff --git a/tests/qemu-iotests/197.out b/tests/qemu-iotests/197.out index 7ca46be6e4..ad414c3b0e 100644 --- a/tests/qemu-iotests/197.out +++ b/tests/qemu-iotests/197.out @@ -26,7 +26,7 @@ Images are identical. === Partial final cluster === -Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1024 +Formatting 'TEST_DIR/t.wrap.IMGFMT', fmt=IMGFMT size=1024 read 1024/1024 bytes at offset 0 1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) 1 KiB (0x400) bytes allocated at offset 0 bytes (0x0)