Max Reitz 38841dcd27 qcow2: Fix .bdrv_has_zero_init() ...

If a qcow2 file is preallocated, it can no longer guarantee that it
initially appears as filled with zeroes.

So implement .bdrv_has_zero_init() by checking whether the file is
preallocated; if so, forward the call to the underlying storage node,
except for when it is encrypted: Encrypted preallocated images always
return effectively random data, so .bdrv_has_zero_init() must always
return 0 for them.

.bdrv_has_zero_init_truncate() can remain bdrv_has_zero_init_1(),
because it presupposes PREALLOC_MODE_OFF.

Reported-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-id: 20190724171239.8764-7-mreitz@redhat.com
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>

2019-08-19 17:13:26 +02:00

..

accounting.c

block/accounting: introduce latency histogram

2018-03-19 14:58:37 -05:00

backup.c

block/backup: refactor write_flags

2019-08-16 18:29:43 -04:00

blkdebug.c

blkdebug: Inject errors on .bdrv_co_block_status()

2019-06-14 14:16:57 +02:00

blklogwrites.c

Include qemu/module.h where needed, drop it from qemu-common.h

2019-06-12 13:18:33 +02:00

blkreplay.c

Include qemu/module.h where needed, drop it from qemu-common.h

2019-06-12 13:18:33 +02:00

blkverify.c

Include qemu/module.h where needed, drop it from qemu-common.h

2019-06-12 13:18:33 +02:00

block-backend.c

Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging

2019-08-16 16:43:46 +01:00

bochs.c

Include qemu-common.h exactly where needed

2019-06-12 13:20:20 +02:00

cloop.c

Include qemu-common.h exactly where needed

2019-06-12 13:20:20 +02:00

commit.c

block-backend: Queue requests while drained

2019-08-16 10:25:16 +02:00

copy-on-read.c

block/copy-on-read: Fix permissions for inactive node

2019-07-30 12:25:43 +02:00

create.c

Include qemu/main-loop.h less

2019-08-16 13:31:52 +02:00

crypto.c

LUKS: support preallocation

2019-08-19 17:13:26 +02:00

crypto.h

Clean up ill-advised or unusual header guards

2019-05-13 08:58:55 +02:00

curl.c

Include qemu/module.h where needed, drop it from qemu-common.h

2019-06-12 13:18:33 +02:00

dirty-bitmap.c

qapi: implement block-dirty-bitmap-remove transaction action

2019-08-16 16:28:03 -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

Include qemu-common.h exactly where needed

2019-06-12 13:20:20 +02:00

dmg.h

Include qemu-common.h exactly where needed

2019-06-12 13:20:20 +02:00

file-posix.c

block: Implement .bdrv_has_zero_init_truncate()

2019-08-19 17:13:26 +02:00

file-win32.c

block: Implement .bdrv_has_zero_init_truncate()

2019-08-19 17:13:26 +02:00

gluster.c

block: Implement .bdrv_has_zero_init_truncate()

2019-08-19 17:13:26 +02:00

io.c

Merge remote-tracking branch 'remotes/ericb/tags/pull-nbd-2019-08-15' into staging

2019-08-16 15:53:37 +01:00

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

iscsi: base all handling of check condition on scsi_sense_to_errno

2019-07-15 11:20:42 +02:00

linux-aio.c

Include qemu-common.h exactly where needed

2019-06-12 13:20:20 +02:00

Makefile.objs

ssh: switch from libssh2 to libssh

2019-06-24 16:01:04 +02:00

mirror.c

mirror: Fix bdrv_has_zero_init() use

2019-08-19 17:13:26 +02:00

nbd.c

Merge remote-tracking branch 'remotes/ericb/tags/pull-nbd-2019-08-15' into staging

2019-08-16 15:53:37 +01:00

nfs.c

block: Implement .bdrv_has_zero_init_truncate()

2019-08-19 17:13:26 +02:00

null.c

Include qemu/module.h where needed, drop it from qemu-common.h

2019-06-12 13:18:33 +02:00

nvme.c

Include qemu/main-loop.h less

2019-08-16 13:31:52 +02:00

parallels.c

block: Use bdrv_has_zero_init_truncate()

2019-08-19 17:13:26 +02:00

parallels.h

Clean up includes

2018-02-09 05:05:11 +01:00

qapi.c

qapi: add dirty-bitmaps to query-named-block-nodes result

2019-08-16 18:29:43 -04:00

qcow2-bitmap.c

qcow2-bitmap: initialize bitmap directory alignment

2019-05-28 20:30:55 +02:00

qcow2-cache.c

Include qemu-common.h exactly where needed

2019-06-12 13:20:20 +02:00

qcow2-cluster.c

Include qemu-common.h exactly where needed

2019-06-12 13:20:20 +02:00

qcow2-refcount.c

Include qemu-common.h exactly where needed

2019-06-12 13:20:20 +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: Fix .bdrv_has_zero_init()

2019-08-19 17:13:26 +02:00

qcow2.h

block: avoid recursive block_status call if possible

2019-06-04 15:20:41 +02:00

qcow.c

block/qcow: Improve error when opening qcow2 files as qcow

2019-07-08 16:00:26 +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: Implement .bdrv_has_zero_init_truncate()

2019-08-19 17:13:26 +02:00

qed.h

block/qed: add missed coroutine_fn markers

2019-04-30 15:29:00 +02:00

quorum.c

Include qemu/module.h where needed, drop it from qemu-common.h

2019-06-12 13:18:33 +02:00

raw-format.c

block: Implement .bdrv_has_zero_init_truncate()

2019-08-19 17:13:26 +02:00

rbd.c

block: Implement .bdrv_has_zero_init_truncate()

2019-08-19 17:13:26 +02:00

replication.c

block/backup: Add mirror sync mode 'bitmap'

2019-08-16 16:28:02 -04:00

sheepdog.c

block: Implement .bdrv_has_zero_init_truncate()

2019-08-19 17:13:26 +02:00

snapshot.c

block/snapshot: remove bdrv_snapshot_delete_by_id_or_name

2019-02-25 15:03:18 +01:00

ssh.c

block: Implement .bdrv_has_zero_init_truncate()

2019-08-19 17:13:26 +02:00

stream.c

block/stream: use BDRV_REQ_PREFETCH

2019-08-15 13:22:13 -05:00

throttle-groups.c

Include qemu/main-loop.h less

2019-08-16 13:31:52 +02:00

throttle.c

Include qemu/module.h where needed, drop it from qemu-common.h

2019-06-12 13:18:33 +02:00

trace-events

block/backup: teach TOP to never copy unallocated regions

2019-08-16 16:28:03 -04:00

vdi.c

block: Add BlockBackend.ctx

2019-06-04 15:22:22 +02:00

vhdx-endian.c

Include qemu-common.h exactly where needed

2019-06-12 13:20:20 +02:00

vhdx-log.c

Include qemu/module.h where needed, drop it from qemu-common.h

2019-06-12 13:18:33 +02:00

vhdx.c

block: Use bdrv_has_zero_init_truncate()

2019-08-19 17:13:26 +02:00

vhdx.h

block/vhdx: Use IEC binary prefixes for size constants

2019-04-30 15:29:00 +02:00

vmdk.c

vmdk: Add read-only support for seSparse snapshots

2019-06-24 15:53:02 +02:00

vpc.c

block: Add BlockBackend.ctx

2019-06-04 15:22:22 +02:00

vvfat.c

qemu-common: Move qemu_isalnum() etc. to qemu/ctype.h

2019-06-11 20:22:09 +02:00

vxhs.c

Include qemu/module.h where needed, drop it from qemu-common.h

2019-06-12 13:18:33 +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