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block: don't register quorum driver if SHA256 support is unavailable

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Commit 488981a4 [block: convert quorum blockdrv to use crypto APIs]
broke qemu-iotest 041 on hosts with GnuTLS < 2.10.0. It converted a
compile-time check to a run-time check at device open time. The result
is that we now advertise a feature (the quorum block driver) that will
never work (on those hosts). There's no way (short of parsing
human-readable error messages) for qemu-iotests or any other API
consumer to recognise that the quorum block driver isn't _actually_
available and shouldn't be used or tested.

Move the run-time check to bdrv_quorum_init() to avoid registering the
quorum block driver if we know it cannot work. This way API consumers
can recognise it's unavailable.

Fixes: 488981a4af
Signed-off-by: Sascha Silbe <silbe@linux.vnet.ibm.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Daniel P. Berrange <berrange@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Message-id: 1438699705-21761-1-git-send-email-silbe@linux.vnet.ibm.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Sascha Silbe 2015-08-04 16:48:25 +02:00 committed by Peter Maydell
parent 2be4f242b5
commit e94867ed5f
1 changed files with 4 additions and 6 deletions
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10
block/quorum.c
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@ -865,12 +865,6 @@ static int quorum_open(BlockDriverState *bs, QDict *options, int flags,
int i;
int ret = 0;
if (!qcrypto_hash_supports(QCRYPTO_HASH_ALG_SHA256)) {
error_setg(errp,
"SHA256 hash support is required for quorum device");
return -EINVAL;
}
qdict_flatten(options);
/* count how many different children are present */
@ -1061,6 +1055,10 @@ static BlockDriver bdrv_quorum = {
static void bdrv_quorum_init(void)
{
if (!qcrypto_hash_supports(QCRYPTO_HASH_ALG_SHA256)) {
/* SHA256 hash support is required for quorum device */
return;
}
bdrv_register(&bdrv_quorum);
}