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qapi: publish copy-before-write filter

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Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20210824083856.17408-23-vsementsov@virtuozzo.com>
Signed-off-by: Hanna Reitz <hreitz@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2021-08-24 11:38:44 +03:00 committed by Hanna Reitz
parent 751cec7a26
commit 783b2825f6
1 changed files with 23 additions and 2 deletions
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25
qapi/block-core.json
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@ -2825,13 +2825,14 @@
# @blklogwrites: Since 3.0
# @blkreplay: Since 4.2
# @compress: Since 5.0
# @copy-before-write: Since 6.2
#
# Since: 2.9
##
{ 'enum': 'BlockdevDriver',
'data': [ 'blkdebug', 'blklogwrites', 'blkreplay', 'blkverify', 'bochs',
'cloop', 'compress', 'copy-on-read', 'dmg', 'file', 'ftp', 'ftps',
'gluster',
'cloop', 'compress', 'copy-before-write', 'copy-on-read', 'dmg',
'file', 'ftp', 'ftps', 'gluster',
{'name': 'host_cdrom', 'if': 'HAVE_HOST_BLOCK_DEVICE' },
{'name': 'host_device', 'if': 'HAVE_HOST_BLOCK_DEVICE' },
'http', 'https', 'iscsi',
@ -4049,6 +4050,25 @@
'base': 'BlockdevOptionsGenericFormat',
'data': { '*bottom': 'str' } }
##
# @BlockdevOptionsCbw:
#
# Driver specific block device options for the copy-before-write driver,
# which does so called copy-before-write operations: when data is
# written to the filter, the filter first reads corresponding blocks
# from its file child and copies them to @target child. After successfully
# copying, the write request is propagated to file child. If copying
# fails, the original write request is failed too and no data is written
# to file child.
#
# @target: The target for copy-before-write operations.
#
# Since: 6.2
##
{ 'struct': 'BlockdevOptionsCbw',
'base': 'BlockdevOptionsGenericFormat',
'data': { 'target': 'BlockdevRef' } }
##
# @BlockdevOptions:
#
@ -4101,6 +4121,7 @@
'bochs': 'BlockdevOptionsGenericFormat',
'cloop': 'BlockdevOptionsGenericFormat',
'compress': 'BlockdevOptionsGenericFormat',
'copy-before-write':'BlockdevOptionsCbw',
'copy-on-read':'BlockdevOptionsCor',
'dmg': 'BlockdevOptionsGenericFormat',
'file': 'BlockdevOptionsFile',