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xemu/tests
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Eric Blake 702aa50d61 nbd: Only require disabled bitmap for read-only exports 
Our initial implementation of x-nbd-server-add-bitmap put
in a restriction because of incremental backups: in that
usage, we are exporting one qcow2 file (the temporary overlay
target of a blockdev-backup sync:none job) and a dirty bitmap
owned by a second qcow2 file (the source of the
blockdev-backup, which is the backing file of the temporary).
While both qcow2 files are still writable (the target in
order to capture copy-on-write of old contents, and the
source in order to track live guest writes in the meantime),
the NBD client expects to see constant data, including the
dirty bitmap.  An enabled bitmap in the source would be
modified by guest writes, which is at odds with the NBD
export being a read-only constant view, hence the initial
code choice of enforcing a disabled bitmap (the intent is
that the exposed bitmap was disabled in the same transaction
that started the blockdev-backup job, although we don't want
to track enough state to actually enforce that).

However, consider the case of a bitmap contained in a read-only
node (including when the bitmap is found in a backing layer of
the active image).  Because the node can't be modified, the
bitmap won't change due to writes, regardless of whether it is
still enabled.  Forbidding the export unless the bitmap is
disabled is awkward, paritcularly since we can't change the
bitmap to be disabled (because the node is read-only).

Alternatively, consider the case of live storage migration,
where management directs the destination to create a writable
NBD server, then performs a drive-mirror from the source to
the target, prior to doing the rest of the live migration.
Since storage migration can be time-consuming, it may be wise
to let the destination include a dirty bitmap to track which
portions it has already received, where even if the migration
is interrupted and restarted, the source can query the
destination block status in order to potentially minimize
re-sending data that has not changed in the meantime on a
second attempt. Such code has not been written, and might not
be trivial (after all, a cluster being marked dirty in the
bitmap does not necessarily guarantee it has the desired
contents), but it makes sense that letting an active dirty
bitmap be exposed and changing alongside writes may prove
useful in the future.

Solve both issues by gating the restriction against a
disabled bitmap to only happen when the caller has requested
a read-only export, and where the BDS that owns the bitmap
(whether or not it is the BDS handed to nbd_export_new() or
from its backing chain) is still writable.  We could drop
the check altogether (if management apps are prepared to
deal with a changing bitmap even on a read-only image), but
for now keeping a check for the read-only case still stands
a chance of preventing management errors.

Update iotest 223 to show the looser behavior by leaving
a bitmap enabled the whole run; note that we have to tear
down and re-export a node when handling an error.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20190111194720.15671-4-eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
2019-01-14 10:09:46 -06:00
..
acceptance virtio: Provide version-specific variants of virtio PCI devices 2018-12-19 16:48:16 -05:00
data bios-tables-test: prepare expected files for mmio64 2018-11-05 13:24:02 -05:00
decode scripts: Add decodetree.py 2018-02-22 15:44:07 -08:00
docker test: replace gtester with a TAP driver 2019-01-11 15:46:52 +01:00
fp Clean up includes 2018-12-20 10:29:08 +01:00
guest-debug tests/guest-debug: fix scoping of failcount 2018-11-13 10:47:59 +00:00
image-fuzzer python: futurize -f lib2to3.fixes.fix_renames 2018-06-08 14:39:24 -03:00
keys
libqos qemu/queue.h: simplify reverse access to QTAILQ 2019-01-11 15:46:55 +01:00
migration migration-test: Only generate a single target architecture 2018-10-11 19:58:26 +01:00
multiboot tests/multiboot: Add .gitignore 2018-03-21 15:13:40 +01:00
qapi-schema qapi: add condition to variants documentation 2018-12-14 06:52:48 +01:00
qemu-iotests nbd: Only require disabled bitmap for read-only exports 2019-01-14 10:09:46 -06:00
rocker
tcg avoid TABs in files that only contain a few 2019-01-11 15:46:56 +01:00
vm tests/vm: Do not abuse parallelism when HOST != TARGET architecture 2018-10-26 22:03:21 +08:00
vmstate-static-checker-data
.gitignore tests/.gitignore: don't ignore docker tests 2018-07-24 11:45:25 +01:00
ac97-test.c
acpi-utils.c hw: acpi: Remove AcpiRsdpDescriptor and fix tests 2018-12-20 11:18:54 -05:00
acpi-utils.h hw: acpi: Remove AcpiRsdpDescriptor and fix tests 2018-12-20 11:18:54 -05:00
ahci-test.c Testing patches for 2018-08-16 2018-08-16 09:50:54 +01:00
atomic64-bench.c tests: add atomic64-bench 2018-10-02 18:47:55 +02:00
atomic_add-bench.c tests/atomic_add-bench: add -p to enable sync profiler 2018-08-23 18:46:25 +02:00
benchmark-crypto-cipher.c crypto: expand algorithm coverage for cipher benchmark 2018-10-24 19:03:37 +01:00
benchmark-crypto-hash.c tests/crypto: Use the IEC binary prefix definitions 2018-07-02 15:41:17 +02:00
benchmark-crypto-hmac.c tests/crypto: Use the IEC binary prefix definitions 2018-07-02 15:41:17 +02:00
bios-tables-test.c hw: acpi: Remove AcpiRsdpDescriptor and fix tests 2018-12-20 11:18:54 -05:00
boot-order-test.c fw_cfg: import & use linux/qemu_fw_cfg.h 2018-08-23 18:46:25 +02:00
boot-sector.c tests/boot-sector: Add magic bytes to s390x boot code header 2018-06-08 13:17:39 -04:00
boot-sector.h tests/boot-sector: Drop dependence on global_qtest 2018-02-14 11:43:41 +01:00
boot-serial-test.c tests: Exit boot-serial-test loop if child dies 2018-12-17 15:37:50 +01:00
cdrom-test.c test: execute g_test_run when tests are skipped 2019-01-11 13:57:25 +01:00
check-block-qdict.c tests: fix crumple/recursive leak 2018-08-15 08:12:19 +02:00
check-block.sh qemu-iotests: convert pwd and $(pwd) to $PWD 2018-11-19 10:08:19 -06:00
check-qdict.c tests: Restore check-qdict unit test 2018-10-10 08:00:00 +02:00
check-qjson.c tests/check-qjson: fix a leak 2018-10-09 13:44:12 +02:00
check-qlist.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
check-qlit.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
check-qnull.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
check-qnum.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
check-qobject.c qstring: Move qstring_from_substr()'s @end one to the right 2018-07-28 09:09:58 +02:00
check-qom-interface.c qom: make interface types abstract 2018-12-11 15:45:22 -02:00
check-qom-proplist.c tests/qom-proplist: check class properties iterator 2018-10-05 16:27:09 +04:00
check-qstring.c qstring: Move qstring_from_substr()'s @end one to the right 2018-07-28 09:09:58 +02:00
cpu-plug-test.c hw/i386: Remove deprecated machines pc-0.10 and pc-0.11 2018-12-20 11:19:12 -05:00
crypto-tls-psk-helpers.c crypto: Implement TLS Pre-Shared Keys (PSK). 2018-07-03 13:04:38 +01:00
crypto-tls-psk-helpers.h crypto: Implement TLS Pre-Shared Keys (PSK). 2018-07-03 13:04:38 +01:00
crypto-tls-x509-helpers.c tests: call qcrypto_init instead of gnutls_global_init 2018-07-24 17:33:39 +01:00
crypto-tls-x509-helpers.h crypto: require gnutls >= 3.1.18 for building QEMU 2018-10-19 12:26:57 +01:00
device-introspect-test.c tests/device-introspect: Test with all machines, not only with "none" 2018-08-23 18:46:25 +02:00
display-vga-test.c tests/display-vga: Enable virtio-vga test 2019-01-11 11:45:00 +01:00
drive_del-test.c tests: add qmp_assert_error_class() 2018-08-31 09:53:10 +02:00
ds1338-test.c libqos: Use explicit QTestState for i2c operations 2018-02-14 11:43:41 +01:00
e1000-test.c
e1000e-test.c tests: Clean up string interpolation around qtest_qmp_device_add() 2018-08-16 08:42:06 +02:00
eepro100-test.c
endianness-test.c libqtest: Replace qtest_startf() by qtest_initf() 2018-08-16 08:42:06 +02:00
es1370-test.c
fdc-test.c libqtest: Remove qtest_qmp_discard_response() & friends 2018-08-16 08:42:06 +02:00
fw_cfg-test.c fw_cfg: import & use linux/qemu_fw_cfg.h 2018-08-23 18:46:25 +02:00
hd-geo-test.c block: Remove deprecated -drive geometry options 2018-08-15 12:50:39 +02:00
hexloader-test.c tests: Move tests/hex-loader-check-data/ to tests/data/hex-loader/ 2018-11-05 13:23:46 -05:00
i440fx-test.c libqos: Track QTestState with QPCIBus 2018-02-14 11:43:02 +01:00
i82801b11-test.c
ide-test.c tests/ide: Free pcibus when finishing a test 2018-11-19 21:59:44 +01:00
intel-hda-test.c
io-channel-helpers.c Include qapi/error.h exactly where needed 2018-02-09 13:50:17 +01:00
io-channel-helpers.h
ioh3420-test.c
iothread.c
iothread.h
ipmi-bt-test.c libqtest: Replace qtest_startf() by qtest_initf() 2018-08-16 08:42:06 +02:00
ipmi-kcs-test.c
ipoctal232-test.c
ivshmem-test.c test: execute g_test_run when tests are skipped 2019-01-11 13:57:25 +01:00
libqtest.c qtest: Add set_irq_in command to set IRQ/GPIO level 2019-01-07 15:23:47 +00:00
libqtest.h qtest: Add set_irq_in command to set IRQ/GPIO level 2019-01-07 15:23:47 +00:00
m25p80-test.c libqtest: Replace qtest_startf() by qtest_initf() 2018-08-16 08:42:06 +02:00
m48t59-test.c libqtest: Replace qtest_startf() by qtest_initf() 2018-08-16 08:42:06 +02:00
machine-none-test.c tests/machine-none: Make test independent of global_qtest 2018-12-17 15:36:40 +01:00
Makefile.include Work around test-qht-par + gprof issues 2019-01-14 10:11:36 +00:00
megasas-test.c libqos: Use explicit QTestState for remaining libqos operations 2018-02-14 11:43:41 +01:00
microbit-test.c tests/microbit-test: Add Tests for nRF51 Timer 2019-01-07 15:23:47 +00:00
migration-test.c test: execute g_test_run when tests are skipped 2019-01-11 13:57:25 +01:00
ne2000-test.c
numa-test.c libqtest: Replace qtest_startf() by qtest_initf() 2018-08-16 08:42:06 +02:00
nvme-test.c nvme: fix out-of-bounds access to the CMB 2018-11-22 16:43:52 +01:00
pca9552-test.c misc: add pca9552 LED blinker model 2018-06-08 13:15:32 +01:00
pcnet-test.c
pkix_asn1_tab.c
pnv-xscom-test.c libqtest: Replace qtest_startf() by qtest_initf() 2018-08-16 08:42:06 +02:00
prom-env-test.c tests/prom-env: Make test independent of global_qtest 2018-12-17 15:36:40 +01:00
ptimer-test-stubs.c qemu-timer: introduce timer attributes 2018-10-19 13:44:03 +02:00
ptimer-test.c ptimer: Add TRIGGER_ONLY_ON_DECREMENT policy option 2018-07-09 14:51:34 +01:00
ptimer-test.h
pvpanic-test.c tests/pvpanic: Make the pvpanic test independent of global_qtest 2018-12-17 15:36:40 +01:00
pxe-test.c tests/pxe: Make test independent of global_qtest 2018-12-17 15:36:40 +01:00
q35-test.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
qemu-iotests-quick.sh
qht-bench.c include: move exec/tb-hash-xx.h to qemu/xxhash.h 2018-12-17 06:04:44 +03:00
qmp-cmd-test.c tests: add qmp/object-add-without-props test 2018-08-31 09:53:10 +02:00
qmp-test.c Revert "tests: Add parameter to qtest_init_without_qmp_handshake" 2018-12-12 10:28:27 +01:00
qom-test.c tests: Skip old versioned machine types in quick testing mode 2018-08-23 18:46:23 +02:00
rcutorture.c rcutorture: remove synchronize_rcu from readers 2018-03-12 16:12:47 +01:00
requirements.txt Acceptance tests: add make rule for running them 2018-10-30 21:13:54 -03:00
rtas-test.c libqos: Use explicit QTestState for remaining libqos operations 2018-02-14 11:43:41 +01:00
rtc-test.c
rtl8139-test.c libqos: Track QTestState with QPCIBus 2018-02-14 11:43:02 +01:00
sdhci-test.c libqtest: Replace qtest_startf() by qtest_initf() 2018-08-16 08:42:06 +02:00
socket-helpers.c sockets: strengthen test suite IP protocol availability checks 2018-03-13 18:06:06 +00:00
socket-helpers.h sockets: strengthen test suite IP protocol availability checks 2018-03-13 18:06:06 +00:00
spapr-phb-test.c
tco-test.c libqtest: Replace qtest_startf() by qtest_initf() 2018-08-16 08:42:06 +02:00
test-aio-multithread.c Include qapi/error.h exactly where needed 2018-02-09 13:50:17 +01:00
test-aio.c coroutine: add test-aio coroutine queue chaining test case 2018-03-27 13:05:28 +01:00
test-arm-mptimer.c tests/test-arm-mptimer: Don't leak string memory 2018-12-14 13:30:54 +00:00
test-base64.c
test-bdrv-drain.c tests/test-bdrv-drain: Fix too late qemu_event_reset() 2018-10-01 19:13:55 +02:00
test-bitcnt.c
test-bitops.c
test-block-backend.c block: test blk_aio_flush() with blk->root == NULL 2018-03-02 18:39:07 +01:00
test-blockjob-txn.c tests/test-blockjob-txn: move .exit to .clean 2018-09-25 15:31:15 +02:00
test-blockjob.c test-blockjob: Acquire AioContext around job_cancel_sync() 2018-09-25 15:50:15 +02:00
test-bufferiszero.c
test-char.c tests/test-char: Check websocket chardev functionality 2018-11-01 12:13:09 +04:00
test-clone-visitor.c Eliminate qapi/qmp/types.h 2018-02-09 13:52:15 +01:00
test-coroutine.c lockable: add QemuLockable 2018-02-08 09:22:03 +08:00
test-crypto-afsplit.c
test-crypto-block.c crypto: support multiple threads accessing one QCryptoBlock 2018-12-12 11:16:49 +00:00
test-crypto-cipher.c
test-crypto-hash.c
test-crypto-hmac.c
test-crypto-ivgen.c
test-crypto-pbkdf.c test: execute g_test_run when tests are skipped 2019-01-11 13:57:25 +01:00
test-crypto-secret.c
test-crypto-tlscredsx509.c crypto: require gnutls >= 3.1.18 for building QEMU 2018-10-19 12:26:57 +01:00
test-crypto-tlssession.c tests: fix TLS handshake failure with TLS 1.3 2018-07-24 17:36:12 +01:00
test-crypto-xts.c crypto: add testing for unaligned buffers with XTS cipher mode 2018-10-24 19:03:37 +01:00
test-cutils.c cutils: Fix qemu_strtosz() & friends to reject non-finite sizes 2018-12-13 19:10:06 +01:00
test-filter-mirror.c tests/test-filter: Make tests independent of global_qtest 2018-12-17 15:36:40 +01:00
test-filter-redirector.c tests/test-filter: Make tests independent of global_qtest 2018-12-17 15:36:40 +01:00
test-hbitmap.c test-hbitmap: Add non-advancing iter_next tests 2018-06-18 17:04:56 +02:00
test-hmp.c tests: Skip old versioned machine types in quick testing mode 2018-08-23 18:46:23 +02:00
test-image-locking.c tests: Add unit tests for image locking 2018-11-12 17:46:57 +01:00
test-int128.c
test-io-channel-buffer.c
test-io-channel-command.c
test-io-channel-file.c io: Fix QIOChannelFile when creating and opening read-write 2018-02-15 16:54:57 +00:00
test-io-channel-socket.c sockets: pull code for testing IP availability out of specific test 2018-03-13 18:06:06 +00:00
test-io-channel-tls.c tests: use error_abort in places expecting errors 2018-07-24 17:35:57 +01:00
test-io-task.c qio: non-default context for threaded qtask 2018-03-06 10:19:05 +00:00
test-iov.c
test-keyval.c hw: Use IEC binary prefix definitions from "qemu/units.h" 2018-07-02 15:41:10 +02:00
test-logging.c
test-mul64.c
test-netfilter.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
test-opts-visitor.c
test-qapi-util.c Drop superfluous includes of qapi-types.h and test-qapi-types.h 2018-02-09 05:05:11 +01:00
test-qdev-global-props.c qdev: all globals are now user-provided 2019-01-07 16:18:42 +04:00
test-qdist.c
test-qemu-opts.c hw: Use IEC binary prefix definitions from "qemu/units.h" 2018-07-02 15:41:10 +02:00
test-qga.c tests: add qmp_assert_error_class() 2018-08-31 09:53:10 +02:00
test-qht-par.c
test-qht.c qht: drop ht argument from qht iterators 2018-09-26 08:55:54 -07:00
test-qmp-cmds.c tests: add oob functional test for test-qmp-cmds 2018-12-12 10:28:27 +01:00
test-qmp-event.c qapi: Drop qapi_event_send_FOO()'s Error ** argument 2018-08-28 18:21:38 +02:00
test-qobject-input-visitor.c test-qobject-input-visitor: Avoid format string ambiguity 2018-08-16 08:42:06 +02:00
test-qobject-output-visitor.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
test-rcu-list.c qemu/queue.h: leave head structs anonymous unless necessary 2019-01-11 15:46:55 +01:00
test-rcu-simpleq.c tests: add test-list-simpleq 2018-08-23 18:46:25 +02:00
test-rcu-tailq.c tests: add test-rcu-tailq 2018-08-23 18:46:25 +02:00
test-replication.c test-replication: Lock AioContext around blk_unref() 2018-10-01 19:13:55 +02:00
test-shift128.c
test-string-input-visitor.c test-string-input-visitor: Add range overflow tests 2018-12-13 19:10:06 +01:00
test-string-output-visitor.c tests/qapi: use ARRAY_SIZE macro 2018-02-10 10:45:14 +03:00
test-thread-pool.c Remove unnecessary variables for function return value 2018-05-20 08:48:13 +03:00
test-throttle.c
test-timed-average.c
test-util-sockets.c monitor: Fix unsafe sharing of @cur_mon among threads 2018-07-23 14:00:03 +02:00
test-uuid.c util: add is_equal to UUID API 2017-12-20 22:01:24 +08:00
test-visitor-serialization.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00
test-vmstate.c qemu/queue.h: simplify reverse access to QTAILQ 2019-01-11 15:46:55 +01:00
test-write-threshold.c
test-x86-cpuid-compat.c build-sys: remove glib_subprocess check 2018-08-23 18:46:25 +02:00
test-x86-cpuid.c
test-xbzrle.c
tmp105-test.c misc: add pca9552 LED blinker model 2018-06-08 13:15:32 +01:00
tpci200-test.c
tpm-crb-swtpm-test.c test: Pass TPM interface model to functions creating command line 2018-06-06 15:44:07 -04:00
tpm-crb-test.c tests: Fix signalling race condition in TPM tests 2018-09-07 16:37:47 -04:00
tpm-emu.c tests: Fix signalling race condition in TPM tests 2018-09-07 16:37:47 -04:00
tpm-emu.h tests: Fix signalling race condition in TPM tests 2018-09-07 16:37:47 -04:00
tpm-tests.c tests: tpm: Use g_test_message rather than fprintf 2018-11-14 16:12:24 -05:00
tpm-tests.h test: Pass TPM interface model to functions creating command line 2018-06-06 15:44:07 -04:00
tpm-tis-swtpm-test.c test: Add swtpm migration test for the TPM TIS interface 2018-06-06 15:44:12 -04:00
tpm-tis-test.c tests: Fix signalling race condition in TPM tests 2018-09-07 16:37:47 -04:00
tpm-util.c tests/tpm: Display if swtpm is not found or --tpm2 not supported 2018-10-30 13:53:15 -04:00
tpm-util.h Clean up includes 2018-12-20 10:29:08 +01:00
usb-hcd-ehci-test.c tests: Clean up string interpolation around qtest_qmp_device_add() 2018-08-16 08:42:06 +02:00
usb-hcd-ohci-test.c tests: Clean up string interpolation around qtest_qmp_device_add() 2018-08-16 08:42:06 +02:00
usb-hcd-uhci-test.c tests: Clean up string interpolation around qtest_qmp_device_add() 2018-08-16 08:42:06 +02:00
usb-hcd-xhci-test.c tests: Clean up string interpolation around qtest_qmp_device_add() 2018-08-16 08:42:06 +02:00
vhost-user-bridge.c Clean up includes 2018-12-20 10:29:08 +01:00
vhost-user-test.c avoid TABs in files that only contain a few 2019-01-11 15:46:56 +01:00
virtio-9p-test.c libqos: Use explicit QTestState for remaining libqos operations 2018-02-14 11:43:41 +01:00
virtio-balloon-test.c libqtest: Replace qtest_startf() by qtest_initf() 2018-08-16 08:42:06 +02:00
virtio-blk-test.c libqtest: Replace qtest_startf() by qtest_initf() 2018-08-16 08:42:06 +02:00
virtio-ccw-test.c tests: virtio: separate ccw tests from libqos 2018-08-23 13:32:50 +02:00
virtio-console-test.c libqtest: Replace qtest_startf() by qtest_initf() 2018-08-16 08:42:06 +02:00
virtio-net-test.c virtio-net-test: add large tx buffer test 2018-12-04 11:06:15 +00:00
virtio-rng-test.c tests: Clean up string interpolation around qtest_qmp_device_add() 2018-08-16 08:42:06 +02:00
virtio-scsi-test.c tests: Clean up string interpolation around qtest_qmp_device_add() 2018-08-16 08:42:06 +02:00
virtio-serial-test.c libqtest: Replace qtest_startf() by qtest_initf() 2018-08-16 08:42:06 +02:00
vmgenid-test.c hw: acpi: Remove AcpiRsdpDescriptor and fix tests 2018-12-20 11:18:54 -05:00
vmxnet3-test.c
wdt_ib700-test.c qobject: Replace qobject_incref/QINCREF qobject_decref/QDECREF 2018-05-04 08:27:53 +02:00