| Message ID | 20200617140036.20311-1-berto@igalia.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2] qcow2: Fix preallocation on images with unaligned sizes | expand |
Patchew URL: https://patchew.org/QEMU/20200617140036.20311-1-berto@igalia.com/
Hi,
This series failed the asan build test. Please find the testing commands and
their output below. If you have Docker installed, you can probably reproduce it
locally.
=== TEST SCRIPT BEGIN ===
#!/bin/bash
export ARCH=x86_64
make docker-image-fedora V=1 NETWORK=1
time make docker-test-debug@fedora TARGET_LIST=x86_64-softmmu J=14 NETWORK=1
=== TEST SCRIPT END ===
GEN docs/interop/qemu-qmp-ref.txt
GEN docs/interop/qemu-qmp-ref.7
CC qga/commands.o
/usr/bin/ld: /usr/lib64/clang/10.0.0/lib/linux/libclang_rt.asan-x86_64.a(asan_interceptors_vfork.S.o): warning: common of `__interception::real_vfork' overridden by definition from /usr/lib64/clang/10.0.0/lib/linux/libclang_rt.asan-x86_64.a(asan_interceptors.cpp.o)
CC qga/guest-agent-command-state.o
CC qga/main.o
CC qga/commands-posix.o
---
GEN docs/interop/qemu-ga-ref.html
GEN docs/interop/qemu-ga-ref.txt
GEN docs/interop/qemu-ga-ref.7
/usr/bin/ld: /usr/lib64/clang/10.0.0/lib/linux/libclang_rt.asan-x86_64.a(asan_interceptors_vfork.S.o): warning: common of `__interception::real_vfork' overridden by definition from /usr/lib64/clang/10.0.0/lib/linux/libclang_rt.asan-x86_64.a(asan_interceptors.cpp.o)
AS pc-bios/optionrom/multiboot.o
AS pc-bios/optionrom/linuxboot.o
CC pc-bios/optionrom/linuxboot_dma.o
---
SIGN pc-bios/optionrom/kvmvapic.bin
SIGN pc-bios/optionrom/multiboot.bin
SIGN pc-bios/optionrom/linuxboot.bin
/usr/bin/ld: /usr/lib64/clang/10.0.0/lib/linux/libclang_rt.asan-x86_64.a(asan_interceptors_vfork.S.o): warning: common of `__interception::real_vfork' overridden by definition from /usr/lib64/clang/10.0.0/lib/linux/libclang_rt.asan-x86_64.a(asan_interceptors.cpp.o)
LINK ivshmem-server
/usr/bin/ld: /usr/lib64/clang/10.0.0/lib/linux/libclang_rt.asan-x86_64.a(asan_interceptors_vfork.S.o): warning: common of `__interception::real_vfork' overridden by definition from /usr/lib64/clang/10.0.0/lib/linux/libclang_rt.asan-x86_64.a(asan_interceptors.cpp.o)
LINK qemu-nbd
BUILD pc-bios/optionrom/linuxboot_dma.img
BUILD pc-bios/optionrom/pvh.img
---
BUILD pc-bios/optionrom/pvh.raw
SIGN pc-bios/optionrom/linuxboot_dma.bin
SIGN pc-bios/optionrom/pvh.bin
/usr/bin/ld: /usr/lib64/clang/10.0.0/lib/linux/libclang_rt.asan-x86_64.a(asan_interceptors_vfork.S.o): warning: common of `__interception::real_vfork' overridden by definition from /usr/lib64/clang/10.0.0/lib/linux/libclang_rt.asan-x86_64.a(asan_interceptors.cpp.o)
LINK qemu-storage-daemon
/usr/bin/ld: /usr/lib64/clang/10.0.0/lib/linux/libclang_rt.asan-x86_64.a(asan_interceptors_vfork.S.o): warning: common of `__interception::real_vfork' overridden by definition from /usr/lib64/clang/10.0.0/lib/linux/libclang_rt.asan-x86_64.a(asan_interceptors.cpp.o)
LINK qemu-img
/usr/bin/ld: /usr/lib64/clang/10.0.0/lib/linux/libclang_rt.asan-x86_64.a(asan_interceptors_vfork.S.o): warning: common of `__interception::real_vfork' overridden by definition from /usr/lib64/clang/10.0.0/lib/linux/libclang_rt.asan-x86_64.a(asan_interceptors.cpp.o)
LINK qemu-io
LINK qemu-edid
/usr/bin/ld: /usr/lib64/clang/10.0.0/lib/linux/libclang_rt.asan-x86_64.a(asan_interceptors_vfork.S.o): warning: common of `__interception::real_vfork' overridden by definition from /usr/lib64/clang/10.0.0/lib/linux/libclang_rt.asan-x86_64.a(asan_interceptors.cpp.o)
/usr/bin/ld: /usr/lib64/clang/10.0.0/lib/linux/libclang_rt.asan-x86_64.a(asan_interceptors_vfork.S.o): warning: common of `__interception::real_vfork' overridden by definition from /usr/lib64/clang/10.0.0/lib/linux/libclang_rt.asan-x86_64.a(asan_interceptors.cpp.o)
/usr/bin/ld: /usr/lib64/clang/10.0.0/lib/linux/libclang_rt.asan-x86_64.a(asan_interceptors_vfork.S.o): warning: common of `__interception::real_vfork' overridden by definition from /usr/lib64/clang/10.0.0/lib/linux/libclang_rt.asan-x86_64.a(asan_interceptors.cpp.o)
LINK fsdev/virtfs-proxy-helper
LINK scsi/qemu-pr-helper
/usr/bin/ld: /usr/lib64/clang/10.0.0/lib/linux/libclang_rt.asan-x86_64.a(asan_interceptors_vfork.S.o): warning: common of `__interception::real_vfork' overridden by definition from /usr/lib64/clang/10.0.0/lib/linux/libclang_rt.asan-x86_64.a(asan_interceptors.cpp.o)
LINK qemu-bridge-helper
/usr/bin/ld: /usr/lib64/clang/10.0.0/lib/linux/libclang_rt.asan-x86_64.a(asan_interceptors_vfork.S.o): warning: common of `__interception::real_vfork' overridden by definition from /usr/lib64/clang/10.0.0/lib/linux/libclang_rt.asan-x86_64.a(asan_interceptors.cpp.o)
LINK virtiofsd
/usr/bin/ld: /usr/lib64/clang/10.0.0/lib/linux/libclang_rt.asan-x86_64.a(asan_interceptors_vfork.S.o): warning: common of `__interception::real_vfork' overridden by definition from /usr/lib64/clang/10.0.0/lib/linux/libclang_rt.asan-x86_64.a(asan_interceptors.cpp.o)
LINK vhost-user-input
/usr/bin/ld: /usr/lib64/clang/10.0.0/lib/linux/libclang_rt.asan-x86_64.a(asan_interceptors_vfork.S.o): warning: common of `__interception::real_vfork' overridden by definition from /usr/lib64/clang/10.0.0/lib/linux/libclang_rt.asan-x86_64.a(asan_interceptors.cpp.o)
/usr/bin/ld: /usr/lib64/clang/10.0.0/lib/linux/libclang_rt.asan-x86_64.a(asan_interceptors_vfork.S.o): warning: common of `__interception::real_vfork' overridden by definition from /usr/lib64/clang/10.0.0/lib/linux/libclang_rt.asan-x86_64.a(asan_interceptors.cpp.o)
LINK qemu-ga
/usr/bin/ld: /usr/lib64/clang/10.0.0/lib/linux/libclang_rt.asan-x86_64.a(asan_interceptors_vfork.S.o): warning: common of `__interception::real_vfork' overridden by definition from /usr/lib64/clang/10.0.0/lib/linux/libclang_rt.asan-x86_64.a(asan_interceptors.cpp.o)
GEN x86_64-softmmu/hmp-commands.h
GEN x86_64-softmmu/config-target.h
GEN x86_64-softmmu/hmp-commands-info.h
---
CC x86_64-softmmu/dump/dump.o
CC x86_64-softmmu/dump/win_dump.o
CC x86_64-softmmu/hw/9pfs/virtio-9p-device.o
/tmp/qemu-test/src/fpu/softfloat.c:3365:13: error: bitwise negation of a boolean expression; did you mean logical negation? [-Werror,-Wbool-operation]
absZ &= ~ ( ( ( roundBits ^ 0x40 ) == 0 ) & roundNearestEven );
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
!
/tmp/qemu-test/src/fpu/softfloat.c:3423:18: error: bitwise negation of a boolean expression; did you mean logical negation? [-Werror,-Wbool-operation]
absZ0 &= ~ ( ( (uint64_t) ( absZ1<<1 ) == 0 ) & roundNearestEven );
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
!
/tmp/qemu-test/src/fpu/softfloat.c:3483:18: error: bitwise negation of a boolean expression; did you mean logical negation? [-Werror,-Wbool-operation]
absZ0 &= ~(((uint64_t)(absZ1<<1) == 0) & roundNearestEven);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
!
/tmp/qemu-test/src/fpu/softfloat.c:3606:13: error: bitwise negation of a boolean expression; did you mean logical negation? [-Werror,-Wbool-operation]
zSig &= ~ ( ( ( roundBits ^ 0x40 ) == 0 ) & roundNearestEven );
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
!
/tmp/qemu-test/src/fpu/softfloat.c:3760:13: error: bitwise negation of a boolean expression; did you mean logical negation? [-Werror,-Wbool-operation]
zSig &= ~ ( ( ( roundBits ^ 0x200 ) == 0 ) & roundNearestEven );
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
!
/tmp/qemu-test/src/fpu/softfloat.c:3987:21: error: bitwise negation of a boolean expression; did you mean logical negation? [-Werror,-Wbool-operation]
~ ( ( (uint64_t) ( zSig1<<1 ) == 0 ) & roundNearestEven );
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
!
/tmp/qemu-test/src/fpu/softfloat.c:4003:22: error: bitwise negation of a boolean expression; did you mean logical negation? [-Werror,-Wbool-operation]
zSig0 &= ~ ( ( (uint64_t) ( zSig1<<1 ) == 0 ) & roundNearestEven );
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
!
/tmp/qemu-test/src/fpu/softfloat.c:4273:18: error: bitwise negation of a boolean expression; did you mean logical negation? [-Werror,-Wbool-operation]
zSig1 &= ~ ( ( zSig2 + zSig2 == 0 ) & roundNearestEven );
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
!
8 errors generated.
make[1]: *** [/tmp/qemu-test/src/rules.mak:69: fpu/softfloat.o] Error 1
make[1]: *** Waiting for unfinished jobs....
/tmp/qemu-test/src/migration/ram.c:919:45: error: implicit conversion from 'unsigned long' to 'double' changes value from 18446744073709551615 to 18446744073709551616 [-Werror,-Wimplicit-int-float-conversion]
xbzrle_counters.encoding_rate = UINT64_MAX;
~ ^~~~~~~~~~
/usr/include/stdint.h:130:23: note: expanded from macro 'UINT64_MAX'
---
18446744073709551615UL
^~~~~~~~~~~~~~~~~~~~~~
1 error generated.
make[1]: *** [/tmp/qemu-test/src/rules.mak:69: migration/ram.o] Error 1
make: *** [Makefile:527: x86_64-softmmu/all] Error 2
Traceback (most recent call last):
File "./tests/docker/docker.py", line 669, in <module>
sys.exit(main())
---
raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['sudo', '-n', 'docker', 'run', '--label', 'com.qemu.instance.uuid=4b33ee20f63a4affba4da2d49a64ab50', '-u', '1003', '--security-opt', 'seccomp=unconfined', '--rm', '-e', 'TARGET_LIST=x86_64-softmmu', '-e', 'EXTRA_CONFIGURE_OPTS=', '-e', 'V=', '-e', 'J=14', '-e', 'DEBUG=', '-e', 'SHOW_ENV=', '-e', 'CCACHE_DIR=/var/tmp/ccache', '-v', '/home/patchew2/.cache/qemu-docker-ccache:/var/tmp/ccache:z', '-v', '/var/tmp/patchew-tester-tmp-reb2wndp/src/docker-src.2020-06-17-10.23.04.9345:/var/tmp/qemu:z,ro', 'qemu:fedora', '/var/tmp/qemu/run', 'test-debug']' returned non-zero exit status 2.
filter=--filter=label=com.qemu.instance.uuid=4b33ee20f63a4affba4da2d49a64ab50
make[1]: *** [docker-run] Error 1
make[1]: Leaving directory `/var/tmp/patchew-tester-tmp-reb2wndp/src'
make: *** [docker-run-test-debug@fedora] Error 2
real 4m36.131s
user 0m7.959s
The full log is available at
http://patchew.org/logs/20200617140036.20311-1-berto@igalia.com/testing.asan/?type=message.
---
Email generated automatically by Patchew [https://patchew.org/].
Please send your feedback to patchew-devel@redhat.com
On 6/17/20 9:00 AM, Alberto Garcia wrote: > When resizing an image with qcow2_co_truncate() using the falloc or > full preallocation modes the code assumes that both the old and new > sizes are cluster-aligned. > > There are two problems with this: > > 1) The calculation of how many clusters are involved does not always > get the right result. > > Example: creating a 60KB image and resizing it (with > preallocation=full) to 80KB won't allocate the second cluster. > > 2) No copy-on-write is performed, so in the previous example if > there is a backing file then the first 60KB of the first cluster > won't be filled with data from the backing file. > > This patch fixes both issues. > > Signed-off-by: Alberto Garcia <berto@igalia.com> > --- > v2: iotests: don't check the image size if data_file is set [Max] > Reviewed-by: Eric Blake <eblake@redhat.com>
ping On Wed 17 Jun 2020 04:00:36 PM CEST, Alberto Garcia wrote: > When resizing an image with qcow2_co_truncate() using the falloc or > full preallocation modes the code assumes that both the old and new > sizes are cluster-aligned. > > There are two problems with this: > > 1) The calculation of how many clusters are involved does not always > get the right result. > > Example: creating a 60KB image and resizing it (with > preallocation=full) to 80KB won't allocate the second cluster. > > 2) No copy-on-write is performed, so in the previous example if > there is a backing file then the first 60KB of the first cluster > won't be filled with data from the backing file. > > This patch fixes both issues. > > Signed-off-by: Alberto Garcia <berto@igalia.com>
On 17.06.20 16:00, Alberto Garcia wrote: > When resizing an image with qcow2_co_truncate() using the falloc or > full preallocation modes the code assumes that both the old and new > sizes are cluster-aligned. > > There are two problems with this: > > 1) The calculation of how many clusters are involved does not always > get the right result. > > Example: creating a 60KB image and resizing it (with > preallocation=full) to 80KB won't allocate the second cluster. > > 2) No copy-on-write is performed, so in the previous example if > there is a backing file then the first 60KB of the first cluster > won't be filled with data from the backing file. > > This patch fixes both issues. > > Signed-off-by: Alberto Garcia <berto@igalia.com> > --- > v2: iotests: don't check the image size if data_file is set [Max] > > block/qcow2.c | 17 ++++++++++++++--- > tests/qemu-iotests/125 | 24 ++++++++++++++++++++++++ > tests/qemu-iotests/125.out | 9 +++++++++ > 3 files changed, 47 insertions(+), 3 deletions(-) Thanks, applied to my block branch: https://git.xanclic.moe/XanClic/qemu/commits/branch/block
diff --git a/block/qcow2.c b/block/qcow2.c index 0cd2e6757e..e20590c3b7 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -4239,8 +4239,8 @@ static int coroutine_fn qcow2_co_truncate(BlockDriverState *bs, int64_t offset, old_file_size = ROUND_UP(old_file_size, s->cluster_size); } - nb_new_data_clusters = DIV_ROUND_UP(offset - old_length, - s->cluster_size); + nb_new_data_clusters = (ROUND_UP(offset, s->cluster_size) - + start_of_cluster(s, old_length)) >> s->cluster_bits; /* This is an overestimation; we will not actually allocate space for * these in the file but just make sure the new refcount structures are @@ -4317,10 +4317,21 @@ static int coroutine_fn qcow2_co_truncate(BlockDriverState *bs, int64_t offset, int64_t nb_clusters = MIN( nb_new_data_clusters, s->l2_slice_size - offset_to_l2_slice_index(s, guest_offset)); - QCowL2Meta allocation = { + unsigned cow_start_length = offset_into_cluster(s, guest_offset); + QCowL2Meta allocation; + guest_offset = start_of_cluster(s, guest_offset); + allocation = (QCowL2Meta) { .offset = guest_offset, .alloc_offset = host_offset, .nb_clusters = nb_clusters, + .cow_start = { + .offset = 0, + .nb_bytes = cow_start_length, + }, + .cow_end = { + .offset = nb_clusters << s->cluster_bits, + .nb_bytes = 0, + }, }; qemu_co_queue_init(&allocation.dependent_requests); diff --git a/tests/qemu-iotests/125 b/tests/qemu-iotests/125 index d510984045..7cb1c19730 100755 --- a/tests/qemu-iotests/125 +++ b/tests/qemu-iotests/125 @@ -164,6 +164,30 @@ for GROWTH_SIZE in 16 48 80; do done done +# Test image resizing using preallocation and unaligned offsets +$QEMU_IMG create -f raw "$TEST_IMG.base" 128k | _filter_img_create +$QEMU_IO -c 'write -q -P 1 0 128k' -f raw "$TEST_IMG.base" +for orig_size in 31k 33k; do + echo "--- Resizing image from $orig_size to 96k ---" + _make_test_img -F raw -b "$TEST_IMG.base" -o cluster_size=64k "$orig_size" + $QEMU_IMG resize -f "$IMGFMT" --preallocation=full "$TEST_IMG" 96k + # The first part of the image should contain data from the backing file + $QEMU_IO -c "read -q -P 1 0 ${orig_size}" "$TEST_IMG" + # The resized part of the image should contain zeroes + $QEMU_IO -c "read -q -P 0 ${orig_size} 63k" "$TEST_IMG" + # If the image does not have an external data file we can also verify its + # actual size. The resized image should have 7 clusters: + # header, L1 table, L2 table, refcount table, refcount block, 2 data clusters + if ! _get_data_file "$TEST_IMG" > /dev/null; then + expected_file_length=$((65536 * 7)) + file_length=$(stat -c '%s' "$TEST_IMG_FILE") + if [ "$file_length" != "$expected_file_length" ]; then + echo "ERROR: file length $file_length (expected $expected_file_length)" + fi + fi + echo +done + # success, all done echo '*** done' rm -f $seq.full diff --git a/tests/qemu-iotests/125.out b/tests/qemu-iotests/125.out index 596905f533..7f76f7af20 100644 --- a/tests/qemu-iotests/125.out +++ b/tests/qemu-iotests/125.out @@ -767,4 +767,13 @@ wrote 2048000/2048000 bytes at offset 0 wrote 81920/81920 bytes at offset 2048000 80 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +Formatting 'TEST_DIR/t.IMGFMT.base', fmt=raw size=131072 +--- Resizing image from 31k to 96k --- +Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=31744 backing_file=TEST_DIR/t.IMGFMT.base backing_fmt=raw +Image resized. + +--- Resizing image from 33k to 96k --- +Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=33792 backing_file=TEST_DIR/t.IMGFMT.base backing_fmt=raw +Image resized. + *** done
When resizing an image with qcow2_co_truncate() using the falloc or full preallocation modes the code assumes that both the old and new sizes are cluster-aligned. There are two problems with this: 1) The calculation of how many clusters are involved does not always get the right result. Example: creating a 60KB image and resizing it (with preallocation=full) to 80KB won't allocate the second cluster. 2) No copy-on-write is performed, so in the previous example if there is a backing file then the first 60KB of the first cluster won't be filled with data from the backing file. This patch fixes both issues. Signed-off-by: Alberto Garcia <berto@igalia.com> --- v2: iotests: don't check the image size if data_file is set [Max] block/qcow2.c | 17 ++++++++++++++--- tests/qemu-iotests/125 | 24 ++++++++++++++++++++++++ tests/qemu-iotests/125.out | 9 +++++++++ 3 files changed, 47 insertions(+), 3 deletions(-)