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block: apply COR-filter to block-stream jobs

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This patch completes the series with the COR-filter applied to
block-stream operations.

Adding the filter makes it possible in future implement discarding
copied regions in backing files during the block-stream job, to reduce
the disk overuse (we need control on permissions).

Also, the filter now is smart enough to do copy-on-read with specified
base, so we have benefit on guest reads even when doing block-stream of
the part of the backing chain.

Several iotests are slightly modified due to filter insertion.

Signed-off-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20201216061703.70908-14-vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Andrey Shinkevich 2020-12-16 09:17:03 +03:00 • committed by Max Reitz
parent 0f6c94988a
commit 205736f488
4 changed files with 80 additions and 55 deletions
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2
tests/qemu-iotests/141.out
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@ -165,7 +165,7 @@ wrote 1048576/1048576 bytes at offset 0
{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "JOB_STATUS_CHANGE", "data": {"status": "running", "id": "job0"}}
{'execute': 'blockdev-del',
'arguments': {'node-name': 'drv0'}}
{"error": {"class": "GenericError", "desc": "Node drv0 is in use"}}
{"error": {"class": "GenericError", "desc": "Node 'drv0' is busy: block device is in use by block job: stream"}}
{'execute': 'block-job-cancel',
'arguments': {'device': 'job0'}}
{"return": {}}