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qapi: copy-on-read filter: add 'bottom' option

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Add an option to limit copy-on-read operations to specified sub-chain
of backing-chain, to make copy-on-read filter useful for block-stream
job.

Suggested-by: Max Reitz <mreitz@redhat.com>
Suggested-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
  [vsementsov: change subject, modified to freeze the chain,
   do some fixes]
Message-Id: <20201216061703.70908-6-vsementsov@virtuozzo.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Andrey Shinkevich 2020-12-16 09:16:55 +03:00 • committed by Max Reitz
parent 880747a887
commit e4c8fddde7
2 changed files with 115 additions and 3 deletions
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20
qapi/block-core.json
View file

@ -3959,6 +3959,24 @@
'data': { 'throttle-group': 'str',
'file' : 'BlockdevRef'
} }
##
# @BlockdevOptionsCor:
#
# Driver specific block device options for the copy-on-read driver.
#
# @bottom: The name of a non-filter node (allocation-bearing layer) that
# limits the COR operations in the backing chain (inclusive), so
# that no data below this node will be copied by this filter.
# If option is absent, the limit is not applied, so that data
# from all backing layers may be copied.
#
# Since: 6.0
##
{ 'struct': 'BlockdevOptionsCor',
'base': 'BlockdevOptionsGenericFormat',
'data': { '*bottom': 'str' } }
##
# @BlockdevOptions:
#
@ -4011,7 +4029,7 @@
'bochs': 'BlockdevOptionsGenericFormat',
'cloop': 'BlockdevOptionsGenericFormat',
'compress': 'BlockdevOptionsGenericFormat',
'copy-on-read':'BlockdevOptionsGenericFormat',
'copy-on-read':'BlockdevOptionsCor',
'dmg': 'BlockdevOptionsGenericFormat',
'file': 'BlockdevOptionsFile',
'ftp': 'BlockdevOptionsCurlFtp',