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c8bb23cbdbe32f5c326365e0a82e1b0e68cdcd8a
qemu-xteink/block
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Anton Nefedov c8bb23cbdb qcow2: skip writing zero buffers to empty COW areas 
If COW areas of the newly allocated clusters are zeroes on the backing
image, efficient bdrv_write_zeroes(flags=BDRV_REQ_NO_FALLBACK) can be
used on the whole cluster instead of writing explicit zero buffers later
in perform_cow().

iotest 060:
write to the discarded cluster does not trigger COW anymore.
Use a backing image instead.

Signed-off-by: Anton Nefedov <anton.nefedov@virtuozzo.com>
Message-id: 20190516142749.81019-2-anton.nefedov@virtuozzo.com
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
2019-05-28 20:30:55 +02:00
..
accounting.c
block/accounting: introduce latency histogram
2018-03-19 14:58:37 -05:00
backup.c
block/backup: refactor: split out backup_calculate_cluster_size
2019-05-28 20:30:55 +02:00
blkdebug.c
block: Advertise BDRV_REQ_NO_FALLBACK in filter drivers
2019-03-26 11:37:51 +01:00
blklogwrites.c
block: Purify .bdrv_refresh_filename()
2019-02-25 15:11:27 +01:00
blkreplay.c
trivial: Make bios files and source files non-executable
2018-09-25 17:26:18 +02:00
blkverify.c
block: Purify .bdrv_refresh_filename()
2019-02-25 15:11:27 +01:00
block-backend.c
block: Make bdrv_root_attach_child() unref child_bs on failure
2019-05-28 20:30:55 +02:00
bochs.c
avoid TABs in files that only contain a few
2019-01-11 15:46:56 +01:00
cloop.c
block: Require auto-read-only for existing fallbacks
2018-11-05 15:09:55 +01:00
commit.c
commit: Use bdrv_append() in commit_start()
2019-05-07 17:14:21 +02:00
copy-on-read.c
block: Advertise BDRV_REQ_NO_FALLBACK in filter drivers
2019-03-26 11:37:51 +01:00
create.c
jobs: utilize job_exit shim
2018-08-31 16:28:33 +02:00
crypto.c
block: Make bdrv_{copy_on_read,crypto_luks,replication} static
2019-03-19 15:49:29 +01:00
crypto.h
Clean up ill-advised or unusual header guards
2019-05-13 08:58:55 +02:00
curl.c
block/curl: Implement bdrv_refresh_filename()
2019-02-25 15:11:27 +01:00
dirty-bitmap.c
bitmaps: Fix typo in function name
2019-03-12 12:05:49 -04:00
dmg-bz2.c
dmg: Move libbz2 code to dmg-bz2.so
2016-10-07 14:14:06 +02:00
dmg-lzfse.c
block: adding lzfse decompressing support as a module.
2018-12-14 11:52:40 +01:00
dmg.c
dmg: don't skip zero chunk
2019-01-04 11:15:09 +00:00
dmg.h
dmg: including dmg-lzfse module inside dmg block driver.
2018-12-14 11:52:40 +01:00
file-posix.c
block/file-posix: Unaligned O_DIRECT block-status
2019-05-20 17:08:57 +02:00
file-win32.c
avoid TABs in files that only contain a few
2019-01-11 15:46:56 +01:00
gluster.c
block/gluster: limit the transfer size to 512 MiB
2019-04-02 12:04:44 +02:00
io.c
block: Use BDRV_REQUEST_MAX_BYTES instead of BDRV_REQUEST_MAX_SECTORS
2019-05-20 17:08:56 +02:00
iscsi-opts.c
Move include qemu/option.h from qemu-common.h to actual users
2018-02-09 13:52:16 +01:00
iscsi.c
block/iscsi: Restrict Linux-specific code
2019-03-11 16:33:49 +01:00
linux-aio.c
avoid TABs in files that only contain a few
2019-01-11 15:46:56 +01:00
Makefile.objs
qcow2: add separate file for threaded data processing functions
2019-05-28 20:30:55 +02:00
mirror.c
blockjob: Propagate AioContext change to all job nodes
2019-05-20 17:08:56 +02:00
nbd-client.c
nbd/client: Trace server noncompliance on structured reads
2019-04-01 08:58:04 -05:00
nbd-client.h
nbd: Restrict connection_co reentrance
2019-02-25 15:03:19 +01:00
nbd.c
nbd/client: Lower min_block for block-status, unaligned size
2019-03-30 20:52:19 -05:00
nfs.c
block: Purify .bdrv_refresh_filename()
2019-02-25 15:11:27 +01:00
null.c
block/null: Generate filename even with latency-ns
2019-02-25 15:11:27 +01:00
nvme.c
block/nvme: Fix bdrv_refresh_filename()
2019-02-25 15:11:27 +01:00
parallels.c
block/parallels: use buffer-based io
2019-04-30 15:29:00 +02:00
parallels.h
Clean up includes
2018-02-09 05:05:11 +01:00
qapi.c
qemu-img: Saner printing of large file sizes
2019-04-30 15:29:00 +02:00
qcow2-bitmap.c
qcow2.h: add missing include
2019-05-28 20:30:55 +02:00
qcow2-cache.c
qcow2.h: add missing include
2019-05-28 20:30:55 +02:00
qcow2-cluster.c
qcow2: skip writing zero buffers to empty COW areas
2019-05-28 20:30:55 +02:00
qcow2-refcount.c
qcow2.h: add missing include
2019-05-28 20:30:55 +02:00
qcow2-snapshot.c
qcow2.h: add missing include
2019-05-28 20:30:55 +02:00
qcow2-threads.c
qcow2: do encryption in threads
2019-05-28 20:30:55 +02:00
qcow2.c
qcow2: skip writing zero buffers to empty COW areas
2019-05-28 20:30:55 +02:00
qcow2.h
qcow2: skip writing zero buffers to empty COW areas
2019-05-28 20:30:55 +02:00
qcow.c
block/qcow: use buffer-based io
2019-04-30 15:29:00 +02:00
qed-check.c
block/qed: add missed coroutine_fn markers
2019-04-30 15:29:00 +02:00
qed-cluster.c
qed: protect table cache with CoMutex
2017-07-17 11:34:11 +08:00
qed-l2-cache.c
qed: protect table cache with CoMutex
2017-07-17 11:34:11 +08:00
qed-table.c
block/qed: add missed coroutine_fn markers
2019-04-30 15:29:00 +02:00
qed.c
block/qed: add missed coroutine_fn markers
2019-04-30 15:29:00 +02:00
qed.h
block/qed: add missed coroutine_fn markers
2019-04-30 15:29:00 +02:00
quorum.c
block: Make bdrv_root_attach_child() unref child_bs on failure
2019-05-28 20:30:55 +02:00
raw-format.c
block: Advertise BDRV_REQ_NO_FALLBACK in filter drivers
2019-03-26 11:37:51 +01:00
rbd.c
block: Add strong_runtime_opts to BlockDriver
2019-02-25 15:11:27 +01:00
replication.c
block: Make bdrv_{copy_on_read,crypto_luks,replication} static
2019-03-19 15:49:29 +01:00
sheepdog.c
block: Add strong_runtime_opts to BlockDriver
2019-02-25 15:11:27 +01:00
snapshot.c
block/snapshot: remove bdrv_snapshot_delete_by_id_or_name
2019-02-25 15:03:18 +01:00
ssh.c
block/ssh: Implement .bdrv_dirname()
2019-05-07 17:14:21 +02:00
stream.c
block/stream: use buffer-based io
2019-04-30 15:29:00 +02:00
throttle-groups.c
throttle-groups: fix restart coroutine iothread race
2019-01-24 10:02:28 +00:00
throttle.c
block: Add strong_runtime_opts to BlockDriver
2019-02-25 15:11:27 +01:00
trace-events
qcow2: skip writing zero buffers to empty COW areas
2019-05-28 20:30:55 +02:00
vdi.c
vdi: Replace bdrv_{read,write}() with bdrv_{pread,pwrite}()
2019-05-10 16:45:40 +02:00
vhdx-endian.c
block/vhdx: Don't take address of fields in packed structs
2018-11-05 15:09:54 +01:00
vhdx-log.c
block/vhdx: Use IEC binary prefixes for size constants
2019-04-30 15:29:00 +02:00
vhdx.c
block/vhdx: Use IEC binary prefixes for size constants
2019-04-30 15:29:00 +02:00
vhdx.h
block/vhdx: Use IEC binary prefixes for size constants
2019-04-30 15:29:00 +02:00
vmdk.c
vmdk: Set vmdk parent backing_format to vmdk
2019-04-30 15:29:00 +02:00
vpc.c
vpc: unlock Coroutine lock to make IO submit Concurrently
2019-04-30 15:29:00 +02:00
vvfat.c
vvfat: Replace bdrv_{read,write}() with bdrv_{pread,pwrite}()
2019-05-10 16:45:40 +02:00
vxhs.c
block: Add strong_runtime_opts to BlockDriver
2019-02-25 15:11:27 +01:00
win32-aio.c
file-win32: Switch to byte-based callbacks
2018-05-15 16:11:41 +02:00
write-threshold.c
qapi: Drop qapi_event_send_FOO()'s Error ** argument
2018-08-28 18:21:38 +02:00