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block: test block-stream with a base node that is used by block-commit

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The base node of a block-stream operation indicates the first image
from the backing chain starting from which no data is copied to the
top node.

The block-stream job allows others to use that base image, so a second
block-stream job could be writing to it at the same time. An important
restriction is that the base image must not disappear while the stream
job is ongoing. stream_start() freezes the backing chain from top to
base with that purpose but it does it too late in the code so there is
a race condition there.

This bug was fixed in the previous commit, and this patch contains an
iotest for this scenario.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Alberto Garcia 2019-03-28 18:25:11 +02:00 • committed by Kevin Wolf
parent 20509c4b8b
commit d20ba603f2
2 changed files with 19 additions and 2 deletions
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4
tests/qemu-iotests/030.out
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@ -1,5 +1,5 @@
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Ran 24 tests
Ran 25 tests
OK