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ef9bba1484
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Alberto Garcia ef9bba1484 quorum: Implement bdrv_co_block_status() 
The quorum driver does not implement bdrv_co_block_status() and
because of that it always reports to contain data even if all its
children are known to be empty.

One consequence of this is that if we for example create a quorum with
a size of 10GB and we mirror it to a new image the operation will
write 10GB of actual zeroes to the destination image wasting a lot of
time and disk space.

Since a quorum has an arbitrary number of children of potentially
different formats there is no way to report all possible allocation
status flags in a way that makes sense, so this implementation only
reports when a given region is known to contain zeroes
(BDRV_BLOCK_ZERO) or not (BDRV_BLOCK_DATA).

If all children agree that a region contains zeroes then we can return
BDRV_BLOCK_ZERO using the smallest size reported by the children
(because all agree that a region of at least that size contains
zeroes).

If at least one child disagrees we have to return BDRV_BLOCK_DATA.
In this case we use the largest of the sizes reported by the children
that didn't return BDRV_BLOCK_ZERO (because we know that there won't
be an agreement for at least that size).

Signed-off-by: Alberto Garcia <berto@igalia.com>
Tested-by: Tao Xu <tao3.xu@intel.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-Id: <db83149afcf0f793effc8878089d29af4c46ffe1.1605286097.git.berto@igalia.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
2020-12-18 12:35:55 +01:00
..
acceptance tests/acceptance: test s390x zpci fid propagation 2020-12-11 11:38:10 +01:00
data tests/acpi: update expected data files 2020-12-10 08:47:44 +01:00
decode
docker Remove obsolete setuptools dependency and fix Stefan's 2020-11-26 14:25:47 +00:00
fp do not use colons in test names 2020-10-22 11:53:53 -04:00
guest-debug
image-fuzzer
include tests: add missing generated sources to testqapi 2020-10-17 10:45:50 -04:00
keys tests/vm: Add Haiku test based on their vagrant images 2020-11-17 09:45:24 +01:00
migration Remove the deprecated -realtime option 2020-12-15 12:52:02 -05:00
multiboot Remove superfluous .gitignore files 2020-10-13 12:48:17 +02:00
perf/block/qcow2
plugin plugin: Fixes compiling errors on msys2/mingw 2020-10-09 17:27:55 +01:00
qapi-schema meson: move SPHINX_ARGS references within "if build_docs" 2020-10-17 10:45:52 -04:00
qemu-iotests quorum: Implement bdrv_co_block_status() 2020-12-18 12:35:55 +01:00
qtest memory: clamp cached translation in case it points to an MMIO region 2020-12-15 12:52:00 -05:00
rocker
tcg tests: remove GCC < 4 fallbacks 2020-12-15 12:52:10 -05:00
tsan
uefi-test-tools Remove superfluous .gitignore files 2020-10-13 12:48:17 +02:00
vm tests/docker, tests/vm: remove setuptools from images 2020-11-25 12:50:48 -05:00
vmstate-static-checker-data
atomic64-bench.c
atomic_add-bench.c
benchmark-crypto-cipher.c
benchmark-crypto-hash.c
benchmark-crypto-hmac.c
check-block-qdict.c
check-block.sh
check-qdict.c
check-qjson.c json: Fix a memleak in parse_pair() 2020-11-17 15:39:53 +01:00
check-qlist.c
check-qlit.c
check-qnull.c
check-qnum.c
check-qobject.c
check-qom-interface.c
check-qom-proplist.c
check-qstring.c
crypto-tls-psk-helpers.c
crypto-tls-psk-helpers.h
crypto-tls-x509-helpers.c
crypto-tls-x509-helpers.h
dbus-vmstate-daemon.sh
io-channel-helpers.c test: Fix LGPL information in the file headers 2020-11-15 17:04:40 +01:00
io-channel-helpers.h test: Fix LGPL information in the file headers 2020-11-15 17:04:40 +01:00
iothread.c
iothread.h
Makefile.include build: replace ninjatool with ninja 2020-10-17 10:45:51 -04:00
meson.build libvhost-user: make it a meson subproject 2020-12-08 13:48:58 -05:00
pkix_asn1_tab.c
ptimer-test-stubs.c replay: do not build if TCG is not available 2020-10-22 11:53:54 -04:00
ptimer-test.c
ptimer-test.h
qht-bench.c
rcutorture.c
requirements.txt Acceptance tests: bump pycdlib version for easier installation 2020-10-13 08:08:55 +02:00
socket-helpers.c
socket-helpers.h
test-aio-multithread.c
test-aio.c
test-authz-list.c authz: Fix Lesser GPL version number 2020-10-29 09:57:37 +00:00
test-authz-listfile.c authz: Fix Lesser GPL version number 2020-10-29 09:57:37 +00:00
test-authz-pam.c authz: Fix Lesser GPL version number 2020-10-29 09:57:37 +00:00
test-authz-simple.c authz: Fix Lesser GPL version number 2020-10-29 09:57:37 +00:00
test-base64.c test: Fix LGPL information in the file headers 2020-11-15 17:04:40 +01:00
test-bdrv-drain.c block: End quiescent sections when a BDS is deleted 2020-10-27 15:26:20 +01:00
test-bdrv-graph-mod.c
test-bitcnt.c
test-bitmap.c mingw: fix error __USE_MINGW_ANSI_STDIO redefined 2020-10-13 13:33:46 +02:00
test-bitops.c
test-block-backend.c
test-block-iothread.c
test-blockjob-txn.c
test-blockjob.c
test-bufferiszero.c test: Fix LGPL information in the file headers 2020-11-15 17:04:40 +01:00
test-char.c treewide: do not use short-form boolean options 2020-12-10 12:15:11 -05:00
test-clone-visitor.c
test-coroutine.c
test-crypto-afsplit.c crypt: Fix Lesser GPL version number 2020-10-29 09:57:37 +00:00
test-crypto-block.c crypt: Fix Lesser GPL version number 2020-10-29 09:57:37 +00:00
test-crypto-cipher.c crypt: Fix Lesser GPL version number 2020-10-29 09:57:37 +00:00
test-crypto-hash.c crypt: Fix Lesser GPL version number 2020-10-29 09:57:37 +00:00
test-crypto-hmac.c
test-crypto-ivgen.c crypt: Fix Lesser GPL version number 2020-10-29 09:57:37 +00:00
test-crypto-pbkdf.c test: Fix LGPL information in the file headers 2020-11-15 17:04:40 +01:00
test-crypto-secret.c crypt: Fix Lesser GPL version number 2020-10-29 09:57:37 +00:00
test-crypto-tlscredsx509.c
test-crypto-tlssession.c
test-crypto-xts.c crypt: Fix Lesser GPL version number 2020-10-29 09:57:37 +00:00
test-cutils.c
test-fdmon-epoll.c
test-hbitmap.c
test-image-locking.c
test-int128.c
test-io-channel-buffer.c io: Fix Lesser GPL version number 2020-10-29 09:57:37 +00:00
test-io-channel-command.c io: Fix Lesser GPL version number 2020-10-29 09:57:37 +00:00
test-io-channel-file.c io: Fix Lesser GPL version number 2020-10-29 09:57:37 +00:00
test-io-channel-socket.c io: Fix Lesser GPL version number 2020-10-29 09:57:37 +00:00
test-io-channel-tls.c
test-io-task.c io: Fix Lesser GPL version number 2020-10-29 09:57:37 +00:00
test-iov.c
test-keyval.c keyval: Parse help options 2020-10-15 16:06:27 +02:00
test-logging.c
test-mul64.c
test-opts-visitor.c
test-qapi-util.c
test-qdev-global-props.c
test-qdist.c
test-qemu-opts.c qemu-option: restrict qemu_opts_set to merge-lists QemuOpts 2020-12-10 12:15:12 -05:00
test-qga.c test-qga: fix a resource leak in test_qga_guest_get_osinfo() 2020-12-09 08:04:34 +01:00
test-qgraph.c test: Fix LGPL information in the file headers 2020-11-15 17:04:40 +01:00
test-qht-par.c
test-qht.c
test-qmp-cmds.c
test-qmp-event.c
test-qobject-input-visitor.c
test-qobject-output-visitor.c
test-rcu-list.c
test-rcu-simpleq.c
test-rcu-slist.c
test-rcu-tailq.c
test-replication.c
test-shift128.c
test-string-input-visitor.c
test-string-output-visitor.c
test-thread-pool.c
test-throttle.c
test-timed-average.c
test-util-filemonitor.c
test-util-sockets.c sockets: Make abstract UnixSocketAddress depend on CONFIG_LINUX 2020-11-03 13:17:25 +00:00
test-uuid.c test: Fix LGPL information in the file headers 2020-11-15 17:04:40 +01:00
test-visitor-serialization.c
test-vmstate.c
test-write-threshold.c block: introduce BDRV_MAX_LENGTH 2020-12-11 17:52:40 +01:00
test-x86-cpuid.c
test-xbzrle.c
vhost-user-bridge.c libvhost-user: make it a meson subproject 2020-12-08 13:48:58 -05:00