Kevin Wolf eb8a0cf3ba qcow2: Forward ZERO_WRITE flag for full preallocation ... The BDRV_REQ_ZERO_WRITE is currently implemented in a way that first the image is possibly preallocated and then the zero flag is added to all clusters. This means that a copy-on-write operation may be needed when writing to these clusters, despite having used preallocation, negating one of the major benefits of preallocation. Instead, try to forward the BDRV_REQ_ZERO_WRITE to the protocol driver, and if the protocol driver can ensure that the new area reads as zeros, we can skip setting the zero flag in the qcow2 layer. Unfortunately, the same approach doesn't work for metadata preallocation, so we'll still set the zero flag there. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Message-Id: <20200424142701.67053-1-kwolf@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>		2020-04-30 17:51:07 +02:00
..
monitor	Use &error_abort instead of separate assert()	2020-03-17 16:05:40 +01:00
accounting.c	block: add empty account cookie type	2019-10-10 10:56:18 +02:00
aio_task.c	block: introduce aio task pool	2019-10-10 10:56:17 +02:00
backup-top.c	block/block-copy: hide structure definitions	2020-03-11 12:42:30 +01:00
backup-top.h	block: introduce backup-top filter driver	2019-10-10 10:56:18 +02:00
backup.c	backup: don't acquire aio_context in backup_clean	2020-04-07 14:34:47 +02:00
blkdebug.c	blkdebug: Allow taking/unsharing permissions	2020-01-06 13:43:06 +01:00
blklogwrites.c	Include qemu/module.h where needed, drop it from qemu-common.h	2019-06-12 13:18:33 +02:00
blkreplay.c	block: implement bdrv_snapshot_goto for blkreplay	2019-10-14 17:12:48 +02:00
blkverify.c	block: Remove bdrv_recurse_is_first_non_filter()	2020-02-18 11:55:40 +01:00
block-backend.c	block-backend: Add flags to blk_truncate()	2020-04-30 17:51:07 +02:00
block-copy.c	block/block-copy: hide structure definitions	2020-03-11 12:42:30 +01:00
bochs.c	block: Use QEMU_IS_ALIGNED	2019-09-16 14:48:30 +02:00
cloop.c	block: Use QEMU_IS_ALIGNED	2019-09-16 14:48:30 +02:00
commit.c	block-backend: Add flags to blk_truncate()	2020-04-30 17:51:07 +02:00
copy-on-read.c	block: Remove bdrv_recurse_is_first_non_filter()	2020-02-18 11:55:40 +01:00
create.c	block/create: Do not abort if a block driver is not available	2019-09-13 12:18:37 +02:00
crypto.c	block-backend: Add flags to blk_truncate()	2020-04-30 17:51:07 +02:00
crypto.h	Clean up ill-advised or unusual header guards	2019-05-13 08:58:55 +02:00
curl.c	block/curl: HTTP header field names are case insensitive	2020-03-11 12:42:29 +01:00
dirty-bitmap.c	block/dirty-bitmap: improve _next_dirty_area API	2020-03-18 14:03:46 -04:00
dmg-bz2.c	Include qemu-common.h exactly where needed	2019-06-12 13:20:20 +02:00
dmg-lzfse.c	block: adding lzfse decompressing support as a module.	2018-12-14 11:52:40 +01:00
dmg.c	block: Use QEMU_IS_ALIGNED	2019-09-16 14:48:30 +02:00
dmg.h	Include qemu-common.h exactly where needed	2019-06-12 13:20:20 +02:00
file-posix.c	file-posix: Support BDRV_REQ_ZERO_WRITE for truncate	2020-04-30 17:51:07 +02:00
file-win32.c	block: Add flags to BlockDriver.bdrv_co_truncate()	2020-04-30 17:51:07 +02:00
filter-compress.c	block: Remove bdrv_recurse_is_first_non_filter()	2020-02-18 11:55:40 +01:00
gluster.c	block: Add flags to BlockDriver.bdrv_co_truncate()	2020-04-30 17:51:07 +02:00
io_uring.c	block/io_uring: Remove superfluous semicolon	2020-02-18 10:54:02 +01:00
io.c	block: truncate: Don't make backing file data visible	2020-04-30 17:51:07 +02:00
iscsi-opts.c	Include qemu/module.h where needed, drop it from qemu-common.h	2019-06-12 13:18:33 +02:00
iscsi.c	block: Add flags to BlockDriver.bdrv_co_truncate()	2020-04-30 17:51:07 +02:00
linux-aio.c	misc: Replace zero-length arrays with flexible array member (automatic)	2020-03-16 22:07:42 +01:00
Makefile.objs	monitor/hmp: rename device-hotplug.c to block/monitor/block-hmp-cmds.c	2020-03-09 18:05:31 +00:00
mirror.c	block-backend: Add flags to blk_truncate()	2020-04-30 17:51:07 +02:00
nbd.c	block: trickle down the fallback image creation function use to the block drivers	2020-03-26 14:44:33 +01:00
nfs.c	block: Add flags to BlockDriver.bdrv_co_truncate()	2020-04-30 17:51:07 +02:00
null.c	replay: add BH oneshot event for block layer	2019-10-14 17:12:48 +02:00
nvme.c	block: trickle down the fallback image creation function use to the block drivers	2020-03-26 14:44:33 +01:00
parallels.c	block: Add flags to bdrv(_co)_truncate()	2020-04-30 17:51:07 +02:00
parallels.h	Clean up includes	2018-02-09 05:05:11 +01:00
qapi-sysemu.c	block: Move system emulator QMP commands to block/qapi-sysemu.c	2020-03-06 17:15:38 +01:00
qapi.c	block: Fix VM size field width in snapshot dump	2020-02-20 16:43:42 +01:00
qcow2-bitmap.c	block/qcow2-bitmap: use bdrv_dirty_bitmap_next_dirty	2020-03-18 14:03:46 -04:00
qcow2-cache.c	core: replace getpagesize() with qemu_real_host_page_size	2019-10-26 15:38:06 +02:00
qcow2-cluster.c	qcow2: Support BDRV_REQ_ZERO_WRITE for truncate	2020-04-30 17:51:07 +02:00
qcow2-refcount.c	block: Add flags to bdrv(_co)_truncate()	2020-04-30 17:51:07 +02:00
qcow2-snapshot.c	qcow2: Don't round the L1 table allocation up to the sector size	2020-02-06 13:47:45 +01:00
qcow2-threads.c	block/qcow2-threads: fix qcow2_decompress	2020-03-11 12:42:30 +01:00
qcow2.c	qcow2: Forward ZERO_WRITE flag for full preallocation	2020-04-30 17:51:07 +02:00
qcow2.h	qcow2: Remove unused fields from BDRVQcow2State	2020-03-27 14:47:23 +01:00
qcow.c	block: Add flags to bdrv(_co)_truncate()	2020-04-30 17:51:07 +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-backend: Add flags to blk_truncate()	2020-04-30 17:51:07 +02:00
qed.h	block/qed: add missed coroutine_fn markers	2019-04-30 15:29:00 +02:00
quorum.c	quorum: Stop marking it as a filter	2020-02-18 11:55:40 +01:00
raw-format.c	raw-format: Support BDRV_REQ_ZERO_WRITE for truncate	2020-04-30 17:51:07 +02:00
rbd.c	block: Add flags to BlockDriver.bdrv_co_truncate()	2020-04-30 17:51:07 +02:00
replication.c	various: Remove suspicious '\' character outside of #define in C code	2020-04-29 08:01:51 +02:00
sheepdog.c	block: Add flags to BlockDriver.bdrv_co_truncate()	2020-04-30 17:51:07 +02:00
snapshot.c	block/snapshot: rename Error ** parameter to more common errp	2019-12-18 08:43:19 +01:00
ssh.c	block: Add flags to BlockDriver.bdrv_co_truncate()	2020-04-30 17:51:07 +02:00
stream.c	block/stream: Remove redundant statement in stream_run()	2020-03-09 15:59:31 +01:00
throttle-groups.c	throttle-groups: fix memory leak in throttle_group_set_limit:	2020-01-06 13:43:06 +01:00
throttle.c	block: Remove bdrv_recurse_is_first_non_filter()	2020-02-18 11:55:40 +01:00
trace-events	block/block-copy: use block_status	2020-03-11 12:42:30 +01:00
vdi.c	block-backend: Add flags to blk_truncate()	2020-04-30 17:51:07 +02:00
vhdx-endian.c	Include qemu-common.h exactly where needed	2019-06-12 13:20:20 +02:00
vhdx-log.c	block: Add flags to bdrv(_co)_truncate()	2020-04-30 17:51:07 +02:00
vhdx.c	block-backend: Add flags to blk_truncate()	2020-04-30 17:51:07 +02:00
vhdx.h	block/vhdx: Use IEC binary prefixes for size constants	2019-04-30 15:29:00 +02:00
vmdk.c	block-backend: Add flags to blk_truncate()	2020-04-30 17:51:07 +02:00
vpc.c	block-backend: Add flags to blk_truncate()	2020-04-30 17:51:07 +02:00
vvfat.c	block/vvfat: Do not unref qcow on closing backing bdrv	2020-02-18 10:53:56 +01:00
vxhs.c	replay: add BH oneshot event for block layer	2019-10-14 17:12:48 +02:00
win32-aio.c	Include qemu/module.h where needed, drop it from qemu-common.h	2019-06-12 13:18:33 +02:00
write-threshold.c	qapi: Drop qapi_event_send_FOO()'s Error ** argument	2018-08-28 18:21:38 +02:00